[svn-upgrade] Integrating new upstream version, strongswan (4.4.0)

68 files changed, 24296 insertions, 0 deletions

diff --git a/src/libcharon/sa/authenticators/authenticator.c b/src/libcharon/sa/authenticators/authenticator.c
new file mode 100644
index 000000000..13586a23e
--- /dev/null
+++ b/src/libcharon/sa/authenticators/authenticator.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2006-2009 Martin Willi
+ * Copyright (C) 2008 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include <string.h>
+
+#include "authenticator.h"
+
+#include <sa/authenticators/pubkey_authenticator.h>
+#include <sa/authenticators/psk_authenticator.h>
+#include <sa/authenticators/eap_authenticator.h>
+#include <encoding/payloads/auth_payload.h>
+
+
+ENUM_BEGIN(auth_method_names, AUTH_RSA, AUTH_DSS,
+	"RSA signature",
+	"pre-shared key",
+	"DSS signature");
+ENUM_NEXT(auth_method_names, AUTH_ECDSA_256, AUTH_ECDSA_521, AUTH_DSS,
+	"ECDSA-256 signature",
+	"ECDSA-384 signature",
+	"ECDSA-521 signature");
+ENUM_END(auth_method_names, AUTH_ECDSA_521);
+
+ENUM(auth_class_names, AUTH_CLASS_ANY, AUTH_CLASS_EAP,
+	"any",
+	"public key",
+	"pre-shared key",
+	"EAP",
+);
+
+/**
+ * Described in header.
+ */
+authenticator_t *authenticator_create_builder(ike_sa_t *ike_sa, auth_cfg_t *cfg,
+									chunk_t received_nonce, chunk_t sent_nonce,
+									chunk_t received_init, chunk_t sent_init)
+{
+	switch ((uintptr_t)cfg->get(cfg, AUTH_RULE_AUTH_CLASS))
+	{
+		case AUTH_CLASS_ANY:
+			/* defaults to PUBKEY */
+		case AUTH_CLASS_PUBKEY:
+			return (authenticator_t*)pubkey_authenticator_create_builder(ike_sa,
+											received_nonce, sent_init);
+		case AUTH_CLASS_PSK:
+			return (authenticator_t*)psk_authenticator_create_builder(ike_sa,
+											received_nonce, sent_init);
+		case AUTH_CLASS_EAP:
+			return (authenticator_t*)eap_authenticator_create_builder(ike_sa,
+						received_nonce, sent_nonce, received_init, sent_init);
+		default:
+			return NULL;
+	}
+}
+
+/**
+ * Described in header.
+ */
+authenticator_t *authenticator_create_verifier(
+									ike_sa_t *ike_sa, message_t *message,
+									chunk_t received_nonce, chunk_t sent_nonce,
+									chunk_t received_init, chunk_t sent_init)
+{
+	auth_payload_t *auth_payload;
+
+	auth_payload = (auth_payload_t*)message->get_payload(message, AUTHENTICATION);
+	if (auth_payload == NULL)
+	{
+		return (authenticator_t*)eap_authenticator_create_verifier(ike_sa,
+						received_nonce, sent_nonce, received_init, sent_init);
+	}
+	switch (auth_payload->get_auth_method(auth_payload))
+	{
+		case AUTH_RSA:
+		case AUTH_ECDSA_256:
+		case AUTH_ECDSA_384:
+		case AUTH_ECDSA_521:
+			return (authenticator_t*)pubkey_authenticator_create_verifier(ike_sa,
+													sent_nonce, received_init);
+		case AUTH_PSK:
+			return (authenticator_t*)psk_authenticator_create_verifier(ike_sa,
+													sent_nonce, received_init);
+		default:
+			return NULL;
+	}
+}
+
diff --git a/src/libcharon/sa/authenticators/authenticator.h b/src/libcharon/sa/authenticators/authenticator.h
new file mode 100644
index 000000000..fff91ed34
--- /dev/null
+++ b/src/libcharon/sa/authenticators/authenticator.h
@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) 2005-2009 Martin Willi
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup authenticator authenticator
+ * @{ @ingroup authenticators
+ */
+
+#ifndef AUTHENTICATOR_H_
+#define AUTHENTICATOR_H_
+
+typedef enum auth_method_t auth_method_t;
+typedef enum auth_class_t auth_class_t;
+typedef struct authenticator_t authenticator_t;
+
+#include <library.h>
+#include <config/auth_cfg.h>
+#include <sa/ike_sa.h>
+
+/**
+ * Method to use for authentication, as defined in IKEv2.
+ */
+enum auth_method_t {
+	/**
+	 * Computed as specified in section 2.15 of RFC using
+	 * an RSA private key over a PKCS#1 padded hash.
+	 */
+	AUTH_RSA = 1,
+
+	/**
+	 * Computed as specified in section 2.15 of RFC using the
+	 * shared key associated with the identity in the ID payload
+	 * and the negotiated prf function
+	 */
+	AUTH_PSK = 2,
+
+	/**
+	 * Computed as specified in section 2.15 of RFC using a
+	 * DSS private key over a SHA-1 hash.
+	 */
+	AUTH_DSS = 3,
+
+	/**
+	 * ECDSA with SHA-256 on the P-256 curve as specified in RFC 4754
+	 */
+	AUTH_ECDSA_256 = 9,
+
+	/**
+	 * ECDSA with SHA-384 on the P-384 curve as specified in RFC 4754
+	 */
+	AUTH_ECDSA_384 = 10,
+
+	/**
+	 * ECDSA with SHA-512 on the P-521 curve as specified in RFC 4754
+	 */
+	AUTH_ECDSA_521 = 11,
+};
+
+/**
+ * enum names for auth_method_t.
+ */
+extern enum_name_t *auth_method_names;
+
+/**
+ * Class of authentication to use. This is different to auth_method_t in that
+ * it does not specify a method, but a class of acceptable methods. The found
+ * certificate finally dictates wich method is used.
+ */
+enum auth_class_t {
+	/** any class acceptable */
+	AUTH_CLASS_ANY = 0,
+	/** authentication using public keys (RSA, ECDSA) */
+	AUTH_CLASS_PUBKEY = 1,
+	/** authentication using a pre-shared secrets */
+	AUTH_CLASS_PSK = 2,
+	/** authentication using EAP */
+	AUTH_CLASS_EAP = 3,
+};
+
+/**
+ * enum strings for auth_class_t
+ */
+extern enum_name_t *auth_class_names;
+
+/**
+ * Authenticator interface implemented by the various authenticators.
+ *
+ * An authenticator implementation handles AUTH and EAP payloads. Received
+ * messages are passed to the process() method, to send authentication data
+ * the message is passed to the build() method.
+ */
+struct authenticator_t {
+
+	/**
+	 * Process an incoming message using the authenticator.
+	 *
+	 * @param message		message containing authentication payloads
+	 * @return
+	 *						- SUCCESS if authentication successful
+	 *						- FAILED if authentication failed
+	 *						- NEED_MORE if another exchange required
+	 */
+	status_t (*process)(authenticator_t *this, message_t *message);
+
+	/**
+	 * Attach authentication data to an outgoing message.
+	 *
+	 * @param message		message to add authentication data to
+	 * @return
+	 *						- SUCCESS if authentication successful
+	 *						- FAILED if authentication failed
+	 *						- NEED_MORE if another exchange required
+	 */
+	status_t (*build)(authenticator_t *this, message_t *message);
+
+	/**
+	 * Check if the authenticator is capable of mutual authentication.
+	 *
+	 * Some authenticator authenticate both peers, e.g. EAP. To support
+	 * mutual authentication with only a single authenticator (EAP-only
+	 * authentication), it must be mutual. This method is invoked in ike_auth
+	 * to check if the given authenticator is capable of doing so.
+	 */
+	bool (*is_mutual)(authenticator_t *this);
+
+	/**
+	 * Destroy authenticator instance.
+	 */
+	void (*destroy) (authenticator_t *this);
+};
+
+/**
+ * Create an authenticator to build signatures.
+ *
+ * @param ike_sa			associated ike_sa
+ * @param cfg				authentication configuration
+ * @param received_nonce	nonce received in IKE_SA_INIT
+ * @param sent_nonce		nonce sent in IKE_SA_INIT
+ * @param received_init		received IKE_SA_INIT message data
+ * @param sent_init			sent IKE_SA_INIT message data
+ * @return					authenticator, NULL if not supported
+ */
+authenticator_t *authenticator_create_builder(
+									ike_sa_t *ike_sa, auth_cfg_t *cfg,
+									chunk_t received_nonce, chunk_t sent_nonce,
+									chunk_t received_init, chunk_t sent_init);
+
+/**
+ * Create an authenticator to verify signatures.
+ *
+ * @param ike_sa			associated ike_sa
+ * @param message			message containing authentication data
+ * @param received_nonce	nonce received in IKE_SA_INIT
+ * @param sent_nonce		nonce sent in IKE_SA_INIT
+ * @param received_init		received IKE_SA_INIT message data
+ * @param sent_init			sent IKE_SA_INIT message data
+ * @return					authenticator, NULL if not supported
+ */
+authenticator_t *authenticator_create_verifier(
+									ike_sa_t *ike_sa, message_t *message,
+									chunk_t received_nonce, chunk_t sent_nonce,
+									chunk_t received_init, chunk_t sent_init);
+
+#endif /** AUTHENTICATOR_H_ @}*/
diff --git a/src/libcharon/sa/authenticators/eap/eap_manager.c b/src/libcharon/sa/authenticators/eap/eap_manager.c
new file mode 100644
index 000000000..f795183f0
--- /dev/null
+++ b/src/libcharon/sa/authenticators/eap/eap_manager.c
@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "eap_manager.h"
+
+#include <utils/linked_list.h>
+#include <threading/rwlock.h>
+
+typedef struct private_eap_manager_t private_eap_manager_t;
+typedef struct eap_entry_t eap_entry_t;
+
+/**
+ * EAP constructor entry
+ */
+struct eap_entry_t {
+
+	/**
+	 * EAP method type, vendor specific if vendor is set
+	 */
+	eap_type_t type;
+
+	/**
+	 * vendor ID, 0 for default EAP methods
+	 */
+	u_int32_t vendor;
+
+	/**
+	 * Role of the method returned by the constructor, EAP_SERVER or EAP_PEER
+	 */
+	eap_role_t role;
+
+	/**
+	 * constructor function to create instance
+	 */
+	eap_constructor_t constructor;
+};
+
+/**
+ * private data of eap_manager
+ */
+struct private_eap_manager_t {
+
+	/**
+	 * public functions
+	 */
+	eap_manager_t public;
+
+	/**
+	 * list of eap_entry_t's
+	 */
+	linked_list_t *methods;
+
+	/**
+	 * rwlock to lock methods
+	 */
+	rwlock_t *lock;
+};
+
+/**
+ * Implementation of eap_manager_t.add_method.
+ */
+static void add_method(private_eap_manager_t *this, eap_type_t type,
+					   u_int32_t vendor, eap_role_t role,
+					   eap_constructor_t constructor)
+{
+	eap_entry_t *entry = malloc_thing(eap_entry_t);
+
+	entry->type = type;
+	entry->vendor = vendor;
+	entry->role = role;
+	entry->constructor = constructor;
+
+	this->lock->write_lock(this->lock);
+	this->methods->insert_last(this->methods, entry);
+	this->lock->unlock(this->lock);
+}
+
+/**
+ * Implementation of eap_manager_t.remove_method.
+ */
+static void remove_method(private_eap_manager_t *this, eap_constructor_t constructor)
+{
+	enumerator_t *enumerator;
+	eap_entry_t *entry;
+
+	this->lock->write_lock(this->lock);
+	enumerator = this->methods->create_enumerator(this->methods);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (constructor == entry->constructor)
+		{
+			this->methods->remove_at(this->methods, enumerator);
+			free(entry);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+}
+
+/**
+ * Implementation of eap_manager_t.create_instance.
+ */
+static eap_method_t* create_instance(private_eap_manager_t *this,
+									 eap_type_t type, u_int32_t vendor,
+									 eap_role_t role, identification_t *server,
+									 identification_t *peer)
+{
+	enumerator_t *enumerator;
+	eap_entry_t *entry;
+	eap_method_t *method = NULL;
+
+	this->lock->read_lock(this->lock);
+	enumerator = this->methods->create_enumerator(this->methods);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (type == entry->type && vendor == entry->vendor &&
+			role == entry->role)
+		{
+			method = entry->constructor(server, peer);
+			if (method)
+			{
+				break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+	return method;
+}
+
+/**
+ * Implementation of 2008_t.destroy
+ */
+static void destroy(private_eap_manager_t *this)
+{
+	this->methods->destroy_function(this->methods, free);
+	this->lock->destroy(this->lock);
+	free(this);
+}
+
+/*
+ * see header file
+ */
+eap_manager_t *eap_manager_create()
+{
+	private_eap_manager_t *this = malloc_thing(private_eap_manager_t);
+
+	this->public.add_method = (void(*)(eap_manager_t*, eap_type_t type, u_int32_t vendor, eap_role_t role, eap_constructor_t constructor))add_method;
+	this->public.remove_method = (void(*)(eap_manager_t*, eap_constructor_t constructor))remove_method;
+	this->public.create_instance = (eap_method_t*(*)(eap_manager_t*, eap_type_t type, u_int32_t vendor, eap_role_t role, identification_t*,identification_t*))create_instance;
+	this->public.destroy = (void(*)(eap_manager_t*))destroy;
+
+	this->methods = linked_list_create();
+	this->lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/authenticators/eap/eap_manager.h b/src/libcharon/sa/authenticators/eap/eap_manager.h
new file mode 100644
index 000000000..0333fb6da
--- /dev/null
+++ b/src/libcharon/sa/authenticators/eap/eap_manager.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup eap_manager eap_manager
+ * @{ @ingroup eap
+ */
+
+#ifndef EAP_MANAGER_H_
+#define EAP_MANAGER_H_
+
+#include <sa/authenticators/eap/eap_method.h>
+
+typedef struct eap_manager_t eap_manager_t;
+
+/**
+ * The EAP manager manages all EAP implementations and creates instances.
+ *
+ * A plugin registers it's implemented EAP method at the manager by
+ * providing type and a contructor function. The manager then instanciates
+ * eap_method_t instances through the provided constructor to handle
+ * EAP authentication.
+ */
+struct eap_manager_t {
+
+	/**
+	 * Register a EAP method implementation.
+	 *
+	 * @param method		vendor specific method, if vendor != 0
+	 * @param vendor		vendor ID, 0 for non-vendor (default) EAP methods
+	 * @param role			EAP role of the registered method
+	 * @param constructor	constructor function, returns an eap_method_t
+	 */
+	void (*add_method)(eap_manager_t *this, eap_type_t type, u_int32_t vendor,
+					   eap_role_t role, eap_constructor_t constructor);
+
+	/**
+	 * Unregister a EAP method implementation using it's constructor.
+	 *
+	 * @param constructor	constructor function to remove, as added in add_method
+	 */
+	void (*remove_method)(eap_manager_t *this, eap_constructor_t constructor);
+
+	/**
+	 * Create a new EAP method instance.
+	 *
+	 * @param type			type of the EAP method
+	 * @param vendor		vendor ID, 0 for non-vendor (default) EAP methods
+	 * @param role			role of EAP method, either EAP_SERVER or EAP_PEER
+	 * @param server		identity of the server
+	 * @param peer			identity of the peer (client)
+	 * @return				EAP method instance, NULL if no constructor found
+	 */
+	eap_method_t* (*create_instance)(eap_manager_t *this, eap_type_t type,
+									 u_int32_t vendor, eap_role_t role,
+									 identification_t *server,
+									 identification_t *peer);
+
+	/**
+	 * Destroy a eap_manager instance.
+	 */
+	void (*destroy)(eap_manager_t *this);
+};
+
+/**
+ * Create a eap_manager instance.
+ */
+eap_manager_t *eap_manager_create();
+
+#endif /** EAP_MANAGER_H_ @}*/
diff --git a/src/libcharon/sa/authenticators/eap/eap_method.c b/src/libcharon/sa/authenticators/eap/eap_method.c
new file mode 100644
index 000000000..91fa5305f
--- /dev/null
+++ b/src/libcharon/sa/authenticators/eap/eap_method.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2006 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "eap_method.h"
+
+ENUM_BEGIN(eap_type_names, EAP_IDENTITY, EAP_GTC,
+	"EAP_IDENTITY",
+	"EAP_NOTIFICATION",
+	"EAP_NAK",
+	"EAP_MD5",
+	"EAP_OTP",
+	"EAP_GTC");
+ENUM_NEXT(eap_type_names, EAP_SIM, EAP_SIM, EAP_GTC,
+	"EAP_SIM");
+ENUM_NEXT(eap_type_names, EAP_AKA, EAP_AKA, EAP_SIM,
+	"EAP_AKA");
+ENUM_NEXT(eap_type_names, EAP_MSCHAPV2, EAP_MSCHAPV2, EAP_AKA,
+	"EAP_MSCHAPV2");
+ENUM_NEXT(eap_type_names, EAP_RADIUS, EAP_EXPERIMENTAL, EAP_MSCHAPV2,
+	"EAP_RADIUS",
+	"EAP_EXPANDED",
+	"EAP_EXPERIMENTAL");
+ENUM_END(eap_type_names, EAP_EXPERIMENTAL);
+
+ENUM_BEGIN(eap_type_short_names, EAP_IDENTITY, EAP_GTC,
+	"ID",
+	"NTF",
+	"NAK",
+	"MD5",
+	"OTP",
+	"GTC");
+ENUM_NEXT(eap_type_short_names, EAP_SIM, EAP_SIM, EAP_GTC,
+	"SIM");
+ENUM_NEXT(eap_type_short_names, EAP_AKA, EAP_AKA, EAP_SIM,
+	"AKA");
+ENUM_NEXT(eap_type_short_names, EAP_MSCHAPV2, EAP_MSCHAPV2, EAP_AKA,
+	"MSCHAPV2");
+ENUM_NEXT(eap_type_short_names, EAP_RADIUS, EAP_EXPERIMENTAL, EAP_MSCHAPV2,
+	"RAD",
+	"EXP",
+	"XP");
+ENUM_END(eap_type_short_names, EAP_EXPERIMENTAL);
+
+/*
+ * See header
+ */
+eap_type_t eap_type_from_string(char *name)
+{
+	int i;
+	static struct {
+		char *name;
+		eap_type_t type;
+	} types[] = {
+		{"identity",	EAP_IDENTITY},
+		{"md5",			EAP_MD5},
+		{"otp",			EAP_OTP},
+		{"gtc",			EAP_GTC},
+		{"sim",			EAP_SIM},
+		{"aka",			EAP_AKA},
+		{"mschapv2",	EAP_MSCHAPV2},
+		{"radius",		EAP_RADIUS},
+	};
+
+	for (i = 0; i < countof(types); i++)
+	{
+		if (strcaseeq(name, types[i].name))
+		{
+			return types[i].type;
+		}
+	}
+	return 0;
+}
+
+ENUM(eap_code_names, EAP_REQUEST, EAP_FAILURE,
+	"EAP_REQUEST",
+	"EAP_RESPONSE",
+	"EAP_SUCCESS",
+	"EAP_FAILURE",
+);
+
+ENUM(eap_code_short_names, EAP_REQUEST, EAP_FAILURE,
+	"REQ",
+	"RES",
+	"SUCC",
+	"FAIL",
+);
+
+ENUM(eap_role_names, EAP_SERVER, EAP_PEER,
+	"EAP_SERVER",
+	"EAP_PEER",
+);
+
+
+
+
diff --git a/src/libcharon/sa/authenticators/eap/eap_method.h b/src/libcharon/sa/authenticators/eap/eap_method.h
new file mode 100644
index 000000000..4cab84535
--- /dev/null
+++ b/src/libcharon/sa/authenticators/eap/eap_method.h
@@ -0,0 +1,205 @@
+/*
+ * Copyright (C) 2006 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup eap_method eap_method
+ * @{ @ingroup eap
+ */
+
+#ifndef EAP_METHOD_H_
+#define EAP_METHOD_H_
+
+typedef struct eap_method_t eap_method_t;
+typedef enum eap_role_t eap_role_t;
+typedef enum eap_type_t eap_type_t;
+typedef enum eap_code_t eap_code_t;
+
+#include <library.h>
+#include <utils/identification.h>
+#include <encoding/payloads/eap_payload.h>
+
+/**
+ * Role of an eap_method, SERVER or PEER (client)
+ */
+enum eap_role_t {
+	EAP_SERVER,
+	EAP_PEER,
+};
+/**
+ * enum names for eap_role_t.
+ */
+extern enum_name_t *eap_role_names;
+
+/**
+ * EAP types, defines the EAP method implementation
+ */
+enum eap_type_t {
+	EAP_IDENTITY = 1,
+	EAP_NOTIFICATION = 2,
+	EAP_NAK = 3,
+	EAP_MD5 = 4,
+	EAP_OTP = 5,
+	EAP_GTC = 6,
+	EAP_SIM = 18,
+	EAP_AKA = 23,
+	EAP_MSCHAPV2 = 26,
+	/** not a method, but an implementation providing different methods */
+	EAP_RADIUS = 253,
+	EAP_EXPANDED = 254,
+	EAP_EXPERIMENTAL = 255,
+};
+
+/**
+ * enum names for eap_type_t.
+ */
+extern enum_name_t *eap_type_names;
+
+/**
+ * short string enum names for eap_type_t.
+ */
+extern enum_name_t *eap_type_short_names;
+
+/**
+ * Lookup the EAP method type from a string.
+ *
+ * @param name		EAP method name (such as "md5", "aka")
+ * @return			method type, 0 if unkown
+ */
+eap_type_t eap_type_from_string(char *name);
+
+/**
+ * EAP code, type of an EAP message
+ */
+enum eap_code_t {
+	EAP_REQUEST = 1,
+	EAP_RESPONSE = 2,
+	EAP_SUCCESS = 3,
+	EAP_FAILURE = 4,
+};
+
+/**
+ * enum names for eap_code_t.
+ */
+extern enum_name_t *eap_code_names;
+
+/**
+ * short string enum names for eap_code_t.
+ */
+extern enum_name_t *eap_code_short_names;
+
+/**
+ * Interface of an EAP method for server and client side.
+ *
+ * An EAP method initiates an EAP exchange and processes requests and
+ * responses. An EAP method may need multiple exchanges before succeeding, and
+ * the eap_authentication may use multiple EAP methods to authenticate a peer.
+ * To accomplish these requirements, all EAP methods have their own
+ * implementation while the eap_authenticatior uses one or more of these
+ * EAP methods. Sending of EAP(SUCCESS/FAILURE) message is not the job
+ * of the method, the eap_authenticator does this.
+ * An EAP method may establish a MSK, this is used the complete the
+ * authentication. Even if a mutual EAP method is used, the traditional
+ * AUTH payloads are required. Only these include the nonces and messages from
+ * ike_sa_init and therefore prevent man in the middle attacks.
+ * The EAP method must use an initial EAP identifier value != 0, as a preceding
+ * EAP-Identity exchange always uses identifier 0.
+ */
+struct eap_method_t {
+
+	/**
+	 * Initiate the EAP exchange.
+	 *
+	 * initiate() is only useable for server implementations, as clients only
+	 * reply to server requests.
+	 * A eap_payload is created in "out" if result is NEED_MORE.
+	 *
+	 * @param out		eap_payload to send to the client
+	 * @return
+	 * 					- NEED_MORE, if an other exchange is required
+	 * 					- FAILED, if unable to create eap request payload
+	 */
+	status_t (*initiate) (eap_method_t *this, eap_payload_t **out);
+
+	/**
+	 * Process a received EAP message.
+	 *
+	 * A eap_payload is created in "out" if result is NEED_MORE.
+	 *
+	 * @param in		eap_payload response received
+	 * @param out		created eap_payload to send
+	 * @return
+	 * 					- NEED_MORE, if an other exchange is required
+	 * 					- FAILED, if EAP method failed
+	 * 					- SUCCESS, if EAP method succeeded
+	 */
+	status_t (*process) (eap_method_t *this, eap_payload_t *in,
+						 eap_payload_t **out);
+
+	/**
+	 * Get the EAP type implemented in this method.
+	 *
+	 * @param vendor	pointer receiving vendor identifier for type, 0 for none
+	 * @return			type of the EAP method
+	 */
+	eap_type_t (*get_type) (eap_method_t *this, u_int32_t *vendor);
+
+	/**
+	 * Check if this EAP method authenticates the server.
+	 *
+	 * Some EAP methods provide mutual authentication and
+	 * allow authentication using only EAP, if the peer supports it.
+	 *
+	 * @return			TRUE if methods provides mutual authentication
+	 */
+	bool (*is_mutual) (eap_method_t *this);
+
+	/**
+	 * Get the MSK established by this EAP method.
+	 *
+	 * Not all EAP methods establish a shared secret. For implementations of
+	 * the EAP-Identity method, get_msk() returns the received identity.
+	 *
+	 * @param msk		chunk receiving internal stored MSK
+	 * @return
+	 *					- SUCCESS, or
+	 * 					- FAILED, if MSK not established (yet)
+	 */
+	status_t (*get_msk) (eap_method_t *this, chunk_t *msk);
+
+	/**
+	 * Destroys a eap_method_t object.
+	 */
+	void (*destroy) (eap_method_t *this);
+};
+
+/**
+ * Constructor definition for a pluggable EAP method.
+ *
+ * Each EAP module must define a constructor function which will return
+ * an initialized object with the methods defined in eap_method_t.
+ * Constructors for server and peers are identical, to support both roles
+ * of a EAP method, a plugin needs register two constructors in the
+ * eap_manager_t.
+ * The passed identites are of type ID_EAP and valid only during the
+ * constructor invocation.
+ *
+ * @param server		ID of the server to use for credential lookup
+ * @param peer			ID of the peer to use for credential lookup
+ * @return				implementation of the eap_method_t interface
+ */
+typedef eap_method_t *(*eap_constructor_t)(identification_t *server,
+										   identification_t *peer);
+
+#endif /** EAP_METHOD_H_ @}*/
diff --git a/src/libcharon/sa/authenticators/eap/sim_manager.c b/src/libcharon/sa/authenticators/eap/sim_manager.c
new file mode 100644
index 000000000..157865083
--- /dev/null
+++ b/src/libcharon/sa/authenticators/eap/sim_manager.c
@@ -0,0 +1,534 @@
+/*
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "sim_manager.h"
+
+#include <daemon.h>
+#include <utils/linked_list.h>
+
+typedef struct private_sim_manager_t private_sim_manager_t;
+
+/**
+ * Private data of an sim_manager_t object.
+ */
+struct private_sim_manager_t {
+
+	/**
+	 * Public sim_manager_t interface.
+	 */
+	sim_manager_t public;
+
+	/**
+	 * list of added cards
+	 */
+	linked_list_t *cards;
+
+	/**
+	 * list of added provider
+	 */
+	linked_list_t *providers;
+
+	/**
+	 * list of added hooks
+	 */
+	linked_list_t *hooks;
+};
+
+/**
+ * Implementation of sim_manager_t.add_card
+ */
+static void add_card(private_sim_manager_t *this, sim_card_t *card)
+{
+	this->cards->insert_last(this->cards, card);
+}
+
+/**
+ * Implementation of sim_manager_t.remove_card
+ */
+static void remove_card(private_sim_manager_t *this, sim_card_t *card)
+{
+	this->cards->remove(this->cards, card, NULL);
+}
+
+/**
+ * Implementation of sim_manager_t.card_get_triplet
+ */
+static bool card_get_triplet(private_sim_manager_t *this, identification_t *id,
+							 char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN],
+							 char kc[SIM_KC_LEN])
+{
+	enumerator_t *enumerator;
+	sim_card_t *card;
+	int tried = 0;
+
+	enumerator = this->cards->create_enumerator(this->cards);
+	while (enumerator->enumerate(enumerator, &card))
+	{
+		if (card->get_triplet(card, id, rand, sres, kc))
+		{
+			enumerator->destroy(enumerator);
+			return TRUE;
+		}
+		tried++;
+	}
+	enumerator->destroy(enumerator);
+	DBG1(DBG_IKE, "tried %d SIM cards, but none has triplets for '%Y'",
+		 tried, id);
+	return FALSE;
+}
+
+/**
+ * Implementation of sim_manager_t.card_get_quintuplet
+ */
+static status_t card_get_quintuplet(private_sim_manager_t *this,
+								identification_t *id, char rand[AKA_RAND_LEN],
+								char autn[AKA_AUTN_LEN], char ck[AKA_CK_LEN],
+								char ik[AKA_IK_LEN], char res[AKA_RES_MAX],
+								int *res_len)
+{
+	enumerator_t *enumerator;
+	sim_card_t *card;
+	status_t status = NOT_FOUND;
+	int tried = 0;
+
+	enumerator = this->cards->create_enumerator(this->cards);
+	while (enumerator->enumerate(enumerator, &card))
+	{
+		status = card->get_quintuplet(card, id, rand, autn, ck, ik, res, res_len);
+		switch (status)
+		{	/* try next on error, but not on INVALID_STATE */
+			case SUCCESS:
+			case INVALID_STATE:
+				enumerator->destroy(enumerator);
+				return status;
+			case NOT_SUPPORTED:
+			case FAILED:
+			default:
+				tried++;
+				continue;
+		}
+	}
+	enumerator->destroy(enumerator);
+	DBG1(DBG_IKE, "tried %d SIM cards, but none has quintuplets for '%Y'",
+		 tried, id);
+	return status;
+}
+
+/**
+ * Implementation of sim_manager_t.card_resync
+ */
+static bool card_resync(private_sim_manager_t *this, identification_t *id,
+						char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN])
+{
+	enumerator_t *enumerator;
+	sim_card_t *card;
+
+	enumerator = this->cards->create_enumerator(this->cards);
+	while (enumerator->enumerate(enumerator, &card))
+	{
+		if (card->resync(card, id, rand, auts))
+		{
+			enumerator->destroy(enumerator);
+			return TRUE;
+		}
+	}
+	enumerator->destroy(enumerator);
+	return FALSE;
+}
+
+/**
+ * Implementation of sim_manager_t.card_set_pseudonym
+ */
+static void card_set_pseudonym(private_sim_manager_t *this,
+							identification_t *id, identification_t *pseudonym)
+{
+	enumerator_t *enumerator;
+	sim_card_t *card;
+
+	DBG1(DBG_IKE, "storing pseudonym '%Y' for '%Y'", pseudonym, id);
+
+	enumerator = this->cards->create_enumerator(this->cards);
+	while (enumerator->enumerate(enumerator, &card))
+	{
+		card->set_pseudonym(card, id, pseudonym);
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * Implementation of sim_manager_t.card_get_pseudonym
+ */
+static identification_t* card_get_pseudonym(private_sim_manager_t *this,
+											identification_t *id)
+{
+	enumerator_t *enumerator;
+	sim_card_t *card;
+	identification_t *pseudonym = NULL;
+
+	enumerator = this->cards->create_enumerator(this->cards);
+	while (enumerator->enumerate(enumerator, &card))
+	{
+		pseudonym = card->get_pseudonym(card, id);
+		if (pseudonym)
+		{
+			DBG1(DBG_IKE, "using stored pseudonym identity '%Y' "
+				 "instead of '%Y'", pseudonym, id);
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	return pseudonym;
+}
+
+/**
+ * Implementation of sim_manager_t.card_set_reauth
+ */
+static void card_set_reauth(private_sim_manager_t *this, identification_t *id,
+							identification_t *next, char mk[HASH_SIZE_SHA1],
+							u_int16_t counter)
+{
+	enumerator_t *enumerator;
+	sim_card_t *card;
+
+	DBG1(DBG_IKE, "storing next reauthentication identity '%Y' for '%Y'",
+		 next, id);
+
+	enumerator = this->cards->create_enumerator(this->cards);
+	while (enumerator->enumerate(enumerator, &card))
+	{
+		card->set_reauth(card, id, next, mk, counter);
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * Implementation of sim_manager_t.card_get_reauth
+ */
+static identification_t* card_get_reauth(private_sim_manager_t *this,
+								identification_t *id, char mk[HASH_SIZE_SHA1],
+								u_int16_t *counter)
+{
+	enumerator_t *enumerator;
+	sim_card_t *card;
+	identification_t *reauth = NULL;
+
+	enumerator = this->cards->create_enumerator(this->cards);
+	while (enumerator->enumerate(enumerator, &card))
+	{
+		reauth = card->get_reauth(card, id, mk, counter);
+		if (reauth)
+		{
+			DBG1(DBG_IKE, "using stored reauthentication identity '%Y' "
+				 "instead of '%Y'", reauth, id);
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	return reauth;
+}
+
+/**
+ * Implementation of sim_manager_t.add_provider
+ */
+static void add_provider(private_sim_manager_t *this, sim_provider_t *provider)
+{
+	this->providers->insert_last(this->providers, provider);
+}
+
+/**
+ * Implementation of sim_manager_t.remove_provider
+ */
+static void remove_provider(private_sim_manager_t *this,
+							sim_provider_t *provider)
+{
+	this->providers->remove(this->providers, provider, NULL);
+}
+
+/**
+ * Implementation of sim_manager_t.provider_get_triplet
+ */
+static bool provider_get_triplet(private_sim_manager_t *this,
+								 identification_t *id, char rand[SIM_RAND_LEN],
+								 char sres[SIM_SRES_LEN], char kc[SIM_KC_LEN])
+{
+	enumerator_t *enumerator;
+	sim_provider_t *provider;
+	int tried = 0;
+
+	enumerator = this->providers->create_enumerator(this->providers);
+	while (enumerator->enumerate(enumerator, &provider))
+	{
+		if (provider->get_triplet(provider, id, rand, sres, kc))
+		{
+			enumerator->destroy(enumerator);
+			return TRUE;
+		}
+		tried++;
+	}
+	enumerator->destroy(enumerator);
+	DBG1(DBG_IKE, "tried %d SIM providers, but none had a triplet for '%Y'",
+		 tried, id);
+	return FALSE;
+}
+
+/**
+ * Implementation of sim_manager_t.provider_get_quintuplet
+ */
+static bool provider_get_quintuplet(private_sim_manager_t *this,
+								identification_t *id, char rand[AKA_RAND_LEN],
+								char xres[AKA_RES_MAX], int *xres_len,
+								char ck[AKA_CK_LEN], char ik[AKA_IK_LEN],
+								char autn[AKA_AUTN_LEN])
+{
+	enumerator_t *enumerator;
+	sim_provider_t *provider;
+	int tried = 0;
+
+	enumerator = this->providers->create_enumerator(this->providers);
+	while (enumerator->enumerate(enumerator, &provider))
+	{
+		if (provider->get_quintuplet(provider, id, rand, xres, xres_len,
+									 ck, ik, autn))
+		{
+			enumerator->destroy(enumerator);
+			return TRUE;
+		}
+	}
+	enumerator->destroy(enumerator);
+	DBG1(DBG_IKE, "tried %d SIM providers, but none had a quintuplet for '%Y'",
+		 tried, id);
+	return FALSE;
+}
+
+/**
+ * Implementation of sim_manager_t.provider_resync
+ */
+static bool provider_resync(private_sim_manager_t *this, identification_t *id,
+							char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN])
+{
+	enumerator_t *enumerator;
+	sim_provider_t *provider;
+
+	enumerator = this->providers->create_enumerator(this->providers);
+	while (enumerator->enumerate(enumerator, &provider))
+	{
+		if (provider->resync(provider, id, rand, auts))
+		{
+			enumerator->destroy(enumerator);
+			return TRUE;
+		}
+	}
+	enumerator->destroy(enumerator);
+	return FALSE;
+}
+
+/**
+ * Implementation of sim_manager_t.provider_is_pseudonym
+ */
+static identification_t* provider_is_pseudonym(private_sim_manager_t *this,
+											   identification_t *id)
+{
+	enumerator_t *enumerator;
+	sim_provider_t *provider;
+	identification_t *permanent = NULL;
+
+	enumerator = this->providers->create_enumerator(this->providers);
+	while (enumerator->enumerate(enumerator, &provider))
+	{
+		permanent = provider->is_pseudonym(provider, id);
+		if (permanent)
+		{
+			DBG1(DBG_IKE, "received pseudonym identity '%Y' "
+				 "mapping to '%Y'", id, permanent);
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	return permanent;
+}
+
+/**
+ * Implementation of sim_manager_t.provider_gen_pseudonym
+ */
+static identification_t* provider_gen_pseudonym(private_sim_manager_t *this,
+												identification_t *id)
+{
+	enumerator_t *enumerator;
+	sim_provider_t *provider;
+	identification_t *pseudonym = NULL;
+
+	enumerator = this->providers->create_enumerator(this->providers);
+	while (enumerator->enumerate(enumerator, &provider))
+	{
+		pseudonym = provider->gen_pseudonym(provider, id);
+		if (pseudonym)
+		{
+			DBG1(DBG_IKE, "proposing new pseudonym '%Y'", pseudonym);
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	return pseudonym;
+}
+
+/**
+ * Implementation of sim_manager_t.provider_is_reauth
+ */
+static identification_t* provider_is_reauth(private_sim_manager_t *this,
+								identification_t *id, char mk[HASH_SIZE_SHA1],
+								u_int16_t *counter)
+{
+	enumerator_t *enumerator;
+	sim_provider_t *provider;
+	identification_t *permanent = NULL;
+
+	enumerator = this->providers->create_enumerator(this->providers);
+	while (enumerator->enumerate(enumerator, &provider))
+	{
+		permanent = provider->is_reauth(provider, id, mk, counter);
+		if (permanent)
+		{
+			DBG1(DBG_IKE, "received reauthentication identity '%Y' "
+				 "mapping to '%Y'", id, permanent);
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	return permanent;
+}
+
+/**
+ * Implementation of sim_manager_t.provider_gen_reauth
+ */
+static identification_t* provider_gen_reauth(private_sim_manager_t *this,
+								identification_t *id, char mk[HASH_SIZE_SHA1])
+{
+	enumerator_t *enumerator;
+	sim_provider_t *provider;
+	identification_t *reauth = NULL;
+
+	enumerator = this->providers->create_enumerator(this->providers);
+	while (enumerator->enumerate(enumerator, &provider))
+	{
+		reauth = provider->gen_reauth(provider, id, mk);
+		if (reauth)
+		{
+			DBG1(DBG_IKE, "proposing new reauthentication identity '%Y'", reauth);
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	return reauth;
+}
+
+/**
+ * Implementation of sim_manager_t.add_hooks
+ */
+static void add_hooks(private_sim_manager_t *this, sim_hooks_t *hooks)
+{
+	this->hooks->insert_last(this->hooks, hooks);
+}
+
+/**
+ * Implementation of sim_manager_t.remove_hooks
+ */
+static void remove_hooks(private_sim_manager_t *this, sim_hooks_t *hooks)
+{
+	this->hooks->remove(this->hooks, hooks, NULL);
+}
+
+/**
+ * Implementation of sim_manager_t.message_hook
+ */
+static void message_hook(private_sim_manager_t *this,
+						 simaka_message_t *message, bool inbound, bool decrypted)
+{
+	enumerator_t *enumerator;
+	sim_hooks_t *hooks;
+
+	enumerator = this->hooks->create_enumerator(this->hooks);
+	while (enumerator->enumerate(enumerator, &hooks))
+	{
+		hooks->message(hooks, message, inbound, decrypted);
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * Implementation of sim_manager_t.key_hook
+ */
+static void key_hook(private_sim_manager_t *this,
+					 chunk_t k_encr, chunk_t k_auth)
+{
+	enumerator_t *enumerator;
+	sim_hooks_t *hooks;
+
+	enumerator = this->hooks->create_enumerator(this->hooks);
+	while (enumerator->enumerate(enumerator, &hooks))
+	{
+		hooks->keys(hooks, k_encr, k_auth);
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * Implementation of sim_manager_t.destroy.
+ */
+static void destroy(private_sim_manager_t *this)
+{
+	this->cards->destroy(this->cards);
+	this->providers->destroy(this->providers);
+	this->hooks->destroy(this->hooks);
+	free(this);
+}
+
+/**
+ * See header
+ */
+sim_manager_t *sim_manager_create()
+{
+	private_sim_manager_t *this = malloc_thing(private_sim_manager_t);
+
+	this->public.add_card = (void(*)(sim_manager_t*, sim_card_t *card))add_card;
+	this->public.remove_card = (void(*)(sim_manager_t*, sim_card_t *card))remove_card;
+	this->public.card_get_triplet = (bool(*)(sim_manager_t*, identification_t *id, char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN], char kc[SIM_KC_LEN]))card_get_triplet;
+	this->public.card_get_quintuplet = (status_t(*)(sim_manager_t*, identification_t *id, char rand[AKA_RAND_LEN], char autn[AKA_AUTN_LEN], char ck[AKA_CK_LEN], char ik[AKA_IK_LEN], char res[AKA_RES_MAX], int *res_len))card_get_quintuplet;
+	this->public.card_resync = (bool(*)(sim_manager_t*, identification_t *id, char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]))card_resync;
+	this->public.card_set_pseudonym = (void(*)(sim_manager_t*, identification_t *id, identification_t *pseudonym))card_set_pseudonym;
+	this->public.card_get_pseudonym = (identification_t*(*)(sim_manager_t*, identification_t *id))card_get_pseudonym;
+	this->public.card_set_reauth = (void(*)(sim_manager_t*, identification_t *id, identification_t *next, char mk[HASH_SIZE_SHA1], u_int16_t counter))card_set_reauth;
+	this->public.card_get_reauth = (identification_t*(*)(sim_manager_t*, identification_t *id, char mk[HASH_SIZE_SHA1], u_int16_t *counter))card_get_reauth;
+	this->public.add_provider = (void(*)(sim_manager_t*, sim_provider_t *provider))add_provider;
+	this->public.remove_provider = (void(*)(sim_manager_t*, sim_provider_t *provider))remove_provider;
+	this->public.provider_get_triplet = (bool(*)(sim_manager_t*, identification_t *id, char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN], char kc[SIM_KC_LEN]))provider_get_triplet;
+	this->public.provider_get_quintuplet = (bool(*)(sim_manager_t*, identification_t *id, char rand[AKA_RAND_LEN], char xres[AKA_RES_MAX], int *xres_len, char ck[AKA_CK_LEN], char ik[AKA_IK_LEN], char autn[AKA_AUTN_LEN]))provider_get_quintuplet;
+	this->public.provider_resync = (bool(*)(sim_manager_t*, identification_t *id, char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]))provider_resync;
+	this->public.provider_is_pseudonym = (identification_t*(*)(sim_manager_t*, identification_t *id))provider_is_pseudonym;
+	this->public.provider_gen_pseudonym = (identification_t*(*)(sim_manager_t*, identification_t *id))provider_gen_pseudonym;
+	this->public.provider_is_reauth = (identification_t*(*)(sim_manager_t*, identification_t *id, char mk[HASH_SIZE_SHA1], u_int16_t *counter))provider_is_reauth;
+	this->public.provider_gen_reauth = (identification_t*(*)(sim_manager_t*, identification_t *id, char mk[HASH_SIZE_SHA1]))provider_gen_reauth;
+	this->public.add_hooks = (void(*)(sim_manager_t*, sim_hooks_t *hooks))add_hooks;
+	this->public.remove_hooks = (void(*)(sim_manager_t*, sim_hooks_t *hooks))remove_hooks;
+	this->public.message_hook = (void(*)(sim_manager_t*, simaka_message_t *message, bool inbound, bool decrypted))message_hook;
+	this->public.key_hook = (void(*)(sim_manager_t*, chunk_t k_encr, chunk_t k_auth))key_hook;
+	this->public.destroy = (void(*)(sim_manager_t*))destroy;
+
+	this->cards = linked_list_create();
+	this->providers = linked_list_create();
+	this->hooks = linked_list_create();
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/authenticators/eap/sim_manager.h b/src/libcharon/sa/authenticators/eap/sim_manager.h
new file mode 100644
index 000000000..9aa661ac8
--- /dev/null
+++ b/src/libcharon/sa/authenticators/eap/sim_manager.h
@@ -0,0 +1,514 @@
+/*
+ * Copyright (C) 2008-2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup sim_manager sim_manager
+ * @{ @ingroup eap
+ */
+
+#ifndef SIM_MANAGER_H_
+#define SIM_MANAGER_H_
+
+#include <crypto/hashers/hasher.h>
+#include <utils/identification.h>
+#include <utils/enumerator.h>
+#include <sa/authenticators/eap/eap_method.h>
+
+typedef struct sim_manager_t sim_manager_t;
+typedef struct sim_card_t sim_card_t;
+typedef struct sim_provider_t sim_provider_t;
+typedef struct sim_hooks_t sim_hooks_t;
+
+/** implemented in libsimaka, but we need it for the message hook */
+typedef struct simaka_message_t simaka_message_t;
+
+#define SIM_RAND_LEN	16
+#define SIM_SRES_LEN	 4
+#define SIM_KC_LEN		 8
+
+#define AKA_RAND_LEN	16
+#define AKA_RES_MAX		16
+#define AKA_CK_LEN		16
+#define AKA_IK_LEN		16
+#define AKA_AUTN_LEN	16
+#define AKA_AUTS_LEN	14
+
+/**
+ * Interface for a (U)SIM card (used as EAP client).
+ *
+ * The SIM card completes triplets/quintuplets requested in a challenge
+ * received from the server.
+ * An implementation supporting only one of SIM/AKA authentication may
+ * implement the other methods with return_false()/return NOT_SUPPORTED/NULL.
+ */
+struct sim_card_t {
+
+	/**
+	 * Calculate SRES/KC from a RAND for SIM authentication.
+	 *
+	 * @param id		permanent identity to get a triplet for
+	 * @param rand		RAND input buffer, fixed size 16 bytes
+	 * @param sres		SRES output buffer, fixed size 4 byte
+	 * @param kc		KC output buffer, fixed size 8 bytes
+	 * @return			TRUE if SRES/KC calculated, FALSE on error/wrong identity
+	 */
+	bool (*get_triplet)(sim_card_t *this, identification_t *id,
+						char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN],
+						char kc[SIM_KC_LEN]);
+
+	/**
+	 * Calculate CK/IK/RES from RAND/AUTN for AKA authentication.
+	 *
+	 * If the received sequence number (in autn) is out of sync, INVALID_STATE
+	 * is returned.
+	 * The RES value is the only one with variable length. Pass a buffer
+	 * of at least AKA_RES_MAX, the actual number of bytes is written to the
+	 * res_len value. While the standard would allow any bit length between
+	 * 32 and 128 bits, we support only full bytes for now.
+	 *
+	 * @param id		permanent identity to request quintuplet for
+	 * @param rand		random value rand
+	 * @param autn		authentication token autn
+	 * @param ck		buffer receiving encryption key ck
+	 * @param ik		buffer receiving integrity key ik
+	 * @param res		buffer receiving authentication result res
+	 * @param res_len	nubmer of bytes written to res buffer
+	 * @return			SUCCESS, FAILED, or INVALID_STATE if out of sync
+	 */
+	status_t (*get_quintuplet)(sim_card_t *this, identification_t *id,
+							   char rand[AKA_RAND_LEN], char autn[AKA_AUTN_LEN],
+							   char ck[AKA_CK_LEN], char ik[AKA_IK_LEN],
+							   char res[AKA_RES_MAX], int *res_len);
+
+	/**
+	 * Calculate AUTS from RAND for AKA resynchronization.
+	 *
+	 * @param id		permanent identity to request quintuplet for
+	 * @param rand		random value rand
+	 * @param auts		resynchronization parameter auts
+	 * @return			TRUE if parameter generated successfully
+	 */
+	bool (*resync)(sim_card_t *this, identification_t *id,
+				   char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]);
+
+	/**
+	 * Set the pseudonym to use for next authentication.
+	 *
+	 * @param id		permanent identity of the peer
+	 * @param pseudonym	pseudonym identity received from the server
+	 */
+	void (*set_pseudonym)(sim_card_t *this, identification_t *id,
+						  identification_t *pseudonym);
+
+	/**
+	 * Get the pseudonym previously stored via set_pseudonym().
+	 *
+	 * @param id		permanent identity of the peer
+	 * @return			associated pseudonym identity, NULL if none stored
+	 */
+	identification_t* (*get_pseudonym)(sim_card_t *this, identification_t *id);
+
+	/**
+	 * Store parameters to use for the next fast reauthentication.
+	 *
+	 * @param id		permanent identity of the peer
+	 * @param next		next fast reauthentication identity to use
+	 * @param mk		master key MK to store for reauthentication
+	 * @param counter	counter value to store, host order
+	 */
+	void (*set_reauth)(sim_card_t *this, identification_t *id,
+					   identification_t *next, char mk[HASH_SIZE_SHA1],
+					   u_int16_t counter);
+
+	/**
+	 * Retrieve parameters for fast reauthentication stored via set_reauth().
+	 *
+	 * @param id		permanent identity of the peer
+	 * @param mk		buffer receiving master key MK
+	 * @param counter	pointer receiving counter value, in host order
+	 * @return			fast reauthentication identity, NULL if not found
+	 */
+	identification_t* (*get_reauth)(sim_card_t *this, identification_t *id,
+									char mk[HASH_SIZE_SHA1], u_int16_t *counter);
+};
+
+/**
+ * Interface for a triplet/quintuplet provider (used as EAP server).
+ *
+ * A SIM provider hands out triplets for SIM authentication and quintuplets
+ * for AKA authentication. Multiple SIM provider instances can serve as
+ * authentication backend to authenticate clients using SIM/AKA.
+ * An implementation supporting only one of SIM/AKA authentication may
+ * implement the other methods with return_false().
+ */
+struct sim_provider_t {
+
+	/**
+	 * Create a challenge for SIM authentication.
+	 *
+	 * @param id		permanent identity of peer to gen triplet for
+	 * @param rand		RAND output buffer, fixed size 16 bytes
+	 * @param sres		SRES output buffer, fixed size 4 byte
+	 * @param kc		KC output buffer, fixed size 8 bytes
+	 * @return			TRUE if triplet received, FALSE otherwise
+	 */
+	bool (*get_triplet)(sim_provider_t *this, identification_t *id,
+						char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN],
+						char kc[SIM_KC_LEN]);
+
+	/**
+	 * Create a challenge for AKA authentication.
+	 *
+	 * The XRES value is the only one with variable length. Pass a buffer
+	 * of at least AKA_RES_MAX, the actual number of bytes is written to the
+	 * xres_len value. While the standard would allow any bit length between
+	 * 32 and 128 bits, we support only full bytes for now.
+	 *
+	 * @param id		permanent identity of peer to create challenge for
+	 * @param rand		buffer receiving random value rand
+	 * @param xres		buffer receiving expected authentication result xres
+	 * @param xres_len	nubmer of bytes written to xres buffer
+	 * @param ck		buffer receiving encryption key ck
+	 * @param ik		buffer receiving integrity key ik
+	 * @param autn		authentication token autn
+	 * @return			TRUE if quintuplet generated successfully
+	 */
+	bool (*get_quintuplet)(sim_provider_t *this, identification_t *id,
+						   char rand[AKA_RAND_LEN],
+						   char xres[AKA_RES_MAX], int *xres_len,
+						   char ck[AKA_CK_LEN], char ik[AKA_IK_LEN],
+						   char autn[AKA_AUTN_LEN]);
+
+	/**
+	 * Process AKA resynchroniusation request of a peer.
+	 *
+	 * @param id		permanent identity of peer requesting resynchronisation
+	 * @param rand		random value rand
+	 * @param auts		synchronization parameter auts
+	 * @return			TRUE if resynchronized successfully
+	 */
+	bool (*resync)(sim_provider_t *this, identification_t *id,
+				   char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]);
+
+	/**
+	 * Check if peer uses a pseudonym, get permanent identity.
+	 *
+	 * @param id		pseudonym identity candidate
+	 * @return			permanent identity, NULL if id not a pseudonym
+	 */
+	identification_t* (*is_pseudonym)(sim_provider_t *this,
+									  identification_t *id);
+
+	/**
+	 * Generate a pseudonym identitiy for a given peer identity.
+	 *
+	 * @param id		permanent identity to generate a pseudonym for
+	 * @return			generated pseudonym, NULL to not use a pseudonym identity
+	 */
+	identification_t* (*gen_pseudonym)(sim_provider_t *this,
+									   identification_t *id);
+
+	/**
+	 * Check if peer uses reauthentication, retrieve reauth parameters.
+	 *
+	 * @param id		reauthentication identity (candidate)
+	 * @param mk		buffer receiving master key MK
+	 * @param counter	pointer receiving current counter value, host order
+	 * @return			permanent identity, NULL if id not a reauth identity
+	 */
+	identification_t* (*is_reauth)(sim_provider_t *this, identification_t *id,
+								   char mk[HASH_SIZE_SHA1], u_int16_t *counter);
+
+	/**
+	 * Generate a fast reauthentication identity, associated to a master key.
+	 *
+	 * @param id		permanent peer identity
+	 * @param mk		master key to store along with generated identity
+	 * @return			fast reauthentication identity, NULL to not use reauth
+	 */
+	identification_t* (*gen_reauth)(sim_provider_t *this, identification_t *id,
+									char mk[HASH_SIZE_SHA1]);
+};
+
+/**
+ * Additional hooks invoked during EAP-SIM/AKA message processing.
+ */
+struct sim_hooks_t {
+
+	/**
+	 * SIM/AKA message parsing.
+	 *
+	 * As a SIM/AKA optionally contains encrypted attributes, the hook
+	 * might get invoked twice, once before and once after decryption.
+	 *
+	 * @param message	SIM/AKA message
+	 * @param inbound	TRUE for incoming messages, FALSE for outgoing
+	 * @param decrypted	TRUE if AT_ENCR_DATA has been decrypted
+	 */
+	void (*message)(sim_hooks_t *this, simaka_message_t *message,
+					bool inbound, bool decrypted);
+
+	/**
+	 * SIM/AKA encryption/authentication key hooks.
+	 *
+	 * @param k_encr	derived SIM/AKA encryption key k_encr
+	 * @param k_auth	derived SIM/AKA authentication key k_auth
+	 */
+	void (*keys)(sim_hooks_t *this, chunk_t k_encr, chunk_t k_auth);
+};
+
+/**
+ * The SIM manager handles multiple (U)SIM cards/providers and hooks.
+ */
+struct sim_manager_t {
+
+	/**
+	 * Register a SIM card (client) at the manager.
+	 *
+	 * @param card		sim card to register
+	 */
+	void (*add_card)(sim_manager_t *this, sim_card_t *card);
+
+	/**
+	 * Unregister a previously registered card from the manager.
+	 *
+	 * @param card		sim card to unregister
+	 */
+	void (*remove_card)(sim_manager_t *this, sim_card_t *card);
+
+	/**
+	 * Calculate SIM triplets on one of the registered SIM cards.
+	 *
+	 * @param id		permanent identity to get a triplet for
+	 * @param rand		RAND input buffer, fixed size 16 bytes
+	 * @param sres		SRES output buffer, fixed size 4 byte
+	 * @param kc		KC output buffer, fixed size 8 bytes
+	 * @return			TRUE if calculated, FALSE if no matching card found
+	 */
+	bool (*card_get_triplet)(sim_manager_t *this, identification_t *id,
+							 char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN],
+							 char kc[SIM_KC_LEN]);
+
+	/**
+	 * Calculate AKA quitpulets on one of the registered SIM cards.
+	 *
+	 * @param id		permanent identity to request quintuplet for
+	 * @param rand		random value rand
+	 * @param autn		authentication token autn
+	 * @param ck		buffer receiving encryption key ck
+	 * @param ik		buffer receiving integrity key ik
+	 * @param res		buffer receiving authentication result res
+	 * @param res_len	nubmer of bytes written to res buffer
+	 * @return			SUCCESS, FAILED, or INVALID_STATE if out of sync
+	 */
+	status_t (*card_get_quintuplet)(sim_manager_t *this, identification_t *id,
+								char rand[AKA_RAND_LEN], char autn[AKA_AUTN_LEN],
+								char ck[AKA_CK_LEN], char ik[AKA_IK_LEN],
+								char res[AKA_RES_MAX], int *res_len);
+
+	/**
+	 * Calculate resynchronization data on one of the registered SIM cards.
+	 *
+	 * @param id		permanent identity to request quintuplet for
+	 * @param rand		random value rand
+	 * @param auts		resynchronization parameter auts
+	 * @return			TRUE if calculated, FALSE if no matcing card found
+	 */
+	bool (*card_resync)(sim_manager_t *this, identification_t *id,
+						char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]);
+
+	/**
+	 * Store a received pseudonym on one of the registered SIM cards.
+	 *
+	 * @param id		permanent identity of the peer
+	 * @param pseudonym	pseudonym identity received from the server
+	 */
+	void (*card_set_pseudonym)(sim_manager_t *this, identification_t *id,
+							   identification_t *pseudonym);
+
+	/**
+	 * Get a stored pseudonym from one of the registerd SIM cards.
+	 *
+	 * @param id		permanent identity of the peer
+	 * @return			associated pseudonym identity, NULL if none found
+	 */
+	identification_t* (*card_get_pseudonym)(sim_manager_t *this,
+											identification_t *id);
+
+	/**
+	 * Store fast reauthentication parameters on one of the registered cards.
+	 *
+	 * @param id		permanent identity of the peer
+	 * @param next		next fast reauthentication identity to use
+	 * @param mk		master key MK to store for reauthentication
+	 * @param counter	counter value to store, host order
+	 */
+	void (*card_set_reauth)(sim_manager_t *this, identification_t *id,
+							identification_t *next, char mk[HASH_SIZE_SHA1],
+							u_int16_t counter);
+
+	/**
+	 * Retrieve fast reauthentication parameters from one of the registerd cards.
+	 *
+	 * @param id		permanent identity of the peer
+	 * @param mk		buffer receiving master key MK
+	 * @param counter	pointer receiving counter value, in host order
+	 * @return			fast reauthentication identity, NULL if none found
+	 */
+	identification_t* (*card_get_reauth)(sim_manager_t *this,
+								identification_t *id, char mk[HASH_SIZE_SHA1],
+								u_int16_t *counter);
+
+	/**
+	 * Register a triplet provider (server) at the manager.
+	 *
+	 * @param card		sim card to register
+	 */
+	void (*add_provider)(sim_manager_t *this, sim_provider_t *provider);
+
+	/**
+	 * Unregister a previously registered provider from the manager.
+	 *
+	 * @param card		sim card to unregister
+	 */
+	void (*remove_provider)(sim_manager_t *this, sim_provider_t *provider);
+
+	/**
+	 * Get a SIM triplet from one of the registered providers.
+	 *
+	 * @param id		permanent identity of peer to gen triplet for
+	 * @param rand		RAND output buffer, fixed size 16 bytes
+	 * @param sres		SRES output buffer, fixed size 4 byte
+	 * @param kc		KC output buffer, fixed size 8 bytes
+	 * @return			TRUE if triplet received, FALSE if no match found
+	 */
+	bool (*provider_get_triplet)(sim_manager_t *this, identification_t *id,
+							char rand[SIM_RAND_LEN], char sres[SIM_SRES_LEN],
+							char kc[SIM_KC_LEN]);
+
+	/**
+	 * Get a AKA quintuplet from one of the registered providers.
+	 *
+	 * @param id		permanent identity of peer to create challenge for
+	 * @param rand		buffer receiving random value rand
+	 * @param xres		buffer receiving expected authentication result xres
+	 * @param ck		buffer receiving encryption key ck
+	 * @param ik		buffer receiving integrity key ik
+	 * @param autn		authentication token autn
+	 * @return			TRUE if quintuplet received, FALSE if no match found
+	 */
+	bool (*provider_get_quintuplet)(sim_manager_t *this, identification_t *id,
+							char rand[AKA_RAND_LEN],
+							char xres[AKA_RES_MAX], int *xres_len,
+							char ck[AKA_CK_LEN], char ik[AKA_IK_LEN],
+							char autn[AKA_AUTN_LEN]);
+
+	/**
+	 * Pass AKA resynchronization data to one of the registered providers.
+	 *
+	 * @param id		permanent identity of peer requesting resynchronisation
+	 * @param rand		random value rand
+	 * @param auts		synchronization parameter auts
+	 * @return			TRUE if resynchronized, FALSE if not handled
+	 */
+	bool (*provider_resync)(sim_manager_t *this, identification_t *id,
+							char rand[AKA_RAND_LEN], char auts[AKA_AUTS_LEN]);
+
+	/**
+	 * Check if a peer uses a pseudonym using one of the registered providers.
+	 *
+	 * @param id		pseudonym identity candidate
+	 * @return			permanent identity, NULL if id not a pseudonym
+	 */
+	identification_t* (*provider_is_pseudonym)(sim_manager_t *this,
+											   identification_t *id);
+
+	/**
+	 * Generate a new pseudonym using one of the registered providers.
+	 *
+	 * @param id		permanent identity to generate a pseudonym for
+	 * @return			generated pseudonym, NULL to not use a pseudonym identity
+	 */
+	identification_t* (*provider_gen_pseudonym)(sim_manager_t *this,
+												identification_t *id);
+
+	/**
+	 * Check if a peer uses a reauth id using one of the registered providers.
+	 *
+	 * @param id		reauthentication identity (candidate)
+	 * @param mk		buffer receiving master key MK
+	 * @param counter	pointer receiving current counter value, host order
+	 * @return			permanent identity, NULL if not a known reauth identity
+	 */
+	identification_t* (*provider_is_reauth)(sim_manager_t *this,
+								identification_t *id, char mk[HASH_SIZE_SHA1],
+								u_int16_t *counter);
+
+	/**
+	 * Generate a fast reauth id using one of the registered providers.
+	 *
+	 * @param id		permanent peer identity
+	 * @param mk		master key to store along with generated identity
+	 * @return			fast reauthentication identity, NULL to not use reauth
+	 */
+	identification_t* (*provider_gen_reauth)(sim_manager_t *this,
+								identification_t *id, char mk[HASH_SIZE_SHA1]);
+
+	/**
+	 * Register a set of hooks to the manager.
+	 *
+	 * @param hooks		hook interface implementation to register
+	 */
+	void (*add_hooks)(sim_manager_t *this, sim_hooks_t *hooks);
+
+	/**
+	 * Unregister a set of hooks from the manager.
+	 *
+	 * @param hooks		hook interface implementation to unregister
+	 */
+	void (*remove_hooks)(sim_manager_t *this, sim_hooks_t *hooks);
+
+	/**
+	 * Invoke SIM/AKA message hook.
+	 *
+	 * @param message	SIM message
+	 * @param inbound	TRUE for incoming messages, FALSE for outgoing
+	 * @param decrypted	TRUE if AT_ENCR_DATA has been decrypted
+	 */
+	void (*message_hook)(sim_manager_t *this, simaka_message_t *message,
+						 bool inbound, bool decrypted);
+
+	/**
+	 * Invoke SIM/AKA key hook.
+	 *
+	 * @param k_encr	SIM/AKA encryption key k_encr
+	 * @param k_auth	SIM/AKA authentication key k_auth
+	 */
+	void (*key_hook)(sim_manager_t *this, chunk_t k_encr, chunk_t k_auth);
+
+	/**
+	 * Destroy a manager instance.
+	 */
+	void (*destroy)(sim_manager_t *this);
+};
+
+/**
+ * Create an SIM manager to handle multiple (U)SIM cards/providers.
+ *
+ * @return			sim_t object
+ */
+sim_manager_t *sim_manager_create();
+
+#endif /** SIM_MANAGER_H_ @}*/
diff --git a/src/libcharon/sa/authenticators/eap_authenticator.c b/src/libcharon/sa/authenticators/eap_authenticator.c
new file mode 100644
index 000000000..4617c4d8d
--- /dev/null
+++ b/src/libcharon/sa/authenticators/eap_authenticator.c
@@ -0,0 +1,705 @@
+/*
+ * Copyright (C) 2006-2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "eap_authenticator.h"
+
+#include <daemon.h>
+#include <sa/authenticators/eap/eap_method.h>
+#include <encoding/payloads/auth_payload.h>
+#include <encoding/payloads/eap_payload.h>
+
+typedef struct private_eap_authenticator_t private_eap_authenticator_t;
+
+/**
+ * Private data of an eap_authenticator_t object.
+ */
+struct private_eap_authenticator_t {
+
+	/**
+	 * Public authenticator_t interface.
+	 */
+	eap_authenticator_t public;
+
+	/**
+	 * Assigned IKE_SA
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * others nonce to include in AUTH calculation
+	 */
+	chunk_t received_nonce;
+
+	/**
+	 * our nonce to include in AUTH calculation
+	 */
+	chunk_t sent_nonce;
+
+	/**
+	 * others IKE_SA_INIT message data to include in AUTH calculation
+	 */
+	chunk_t received_init;
+
+	/**
+	 * our IKE_SA_INIT message data to include in AUTH calculation
+	 */
+	chunk_t sent_init;
+
+	/**
+	 * Current EAP method processing
+	 */
+	eap_method_t *method;
+
+	/**
+	 * MSK used to build and verify auth payload
+	 */
+	chunk_t msk;
+
+	/**
+	 * EAP authentication method completed successfully
+	 */
+	bool eap_complete;
+
+	/**
+	 * Set if we require mutual EAP due EAP-only authentication
+	 */
+	bool require_mutual;
+
+	/**
+	 * authentication payload verified successfully
+	 */
+	bool auth_complete;
+
+	/**
+	 * generated EAP payload
+	 */
+	eap_payload_t *eap_payload;
+
+	/**
+	 * EAP identity of peer
+	 */
+	identification_t *eap_identity;
+};
+
+/**
+ * load an EAP method
+ */
+static eap_method_t *load_method(private_eap_authenticator_t *this,
+							eap_type_t type, u_int32_t vendor, eap_role_t role)
+{
+	identification_t *server, *peer;
+
+	if (role == EAP_SERVER)
+	{
+		server = this->ike_sa->get_my_id(this->ike_sa);
+		peer = this->ike_sa->get_other_id(this->ike_sa);
+	}
+	else
+	{
+		server = this->ike_sa->get_other_id(this->ike_sa);
+		peer = this->ike_sa->get_my_id(this->ike_sa);
+	}
+	if (this->eap_identity)
+	{
+		peer = this->eap_identity;
+	}
+	return charon->eap->create_instance(charon->eap, type, vendor,
+										role, server, peer);
+}
+
+/**
+ * Initiate EAP conversation as server
+ */
+static eap_payload_t* server_initiate_eap(private_eap_authenticator_t *this,
+										  bool do_identity)
+{
+	auth_cfg_t *auth;
+	eap_type_t type;
+	identification_t *id;
+	u_int32_t vendor;
+	eap_payload_t *out;
+	char *action;
+
+	auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+
+	/* initiate EAP-Identity exchange if required */
+	if (!this->eap_identity && do_identity)
+	{
+		id = auth->get(auth, AUTH_RULE_EAP_IDENTITY);
+		if (id)
+		{
+			this->method = load_method(this, EAP_IDENTITY, 0, EAP_SERVER);
+			if (this->method)
+			{
+				if (this->method->initiate(this->method, &out) == NEED_MORE)
+				{
+					DBG1(DBG_IKE, "initiating EAP-Identity request");
+					return out;
+				}
+				this->method->destroy(this->method);
+			}
+			DBG1(DBG_IKE, "EAP-Identity request configured, but not supported");
+		}
+	}
+	/* invoke real EAP method */
+	type = (uintptr_t)auth->get(auth, AUTH_RULE_EAP_TYPE);
+	vendor = (uintptr_t)auth->get(auth, AUTH_RULE_EAP_VENDOR);
+	action = "loading";
+	this->method = load_method(this, type, vendor, EAP_SERVER);
+	if (this->method)
+	{
+		action = "initiating";
+		if (this->method->initiate(this->method, &out) == NEED_MORE)
+		{
+			if (vendor)
+			{
+				DBG1(DBG_IKE, "initiating EAP vendor type %d-%d method",
+							  type, vendor);
+			}
+			else
+			{
+				DBG1(DBG_IKE, "initiating %N method", eap_type_names, type);
+			}
+			return out;
+		}
+	}
+	if (vendor)
+	{
+		DBG1(DBG_IKE, "%s EAP vendor type %d-%d method failed",
+					  action, type,	vendor);
+	}
+	else
+	{
+		DBG1(DBG_IKE, "%s %N method failed", action, eap_type_names, type);
+	}
+	return eap_payload_create_code(EAP_FAILURE, 0);
+}
+
+/**
+ * Replace the existing EAP-Identity in other auth config
+ */
+static void replace_eap_identity(private_eap_authenticator_t *this)
+{
+	enumerator_t *enumerator;
+	auth_rule_t rule;
+	auth_cfg_t *cfg;
+	void *ptr;
+
+	cfg = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+	enumerator = cfg->create_enumerator(cfg);
+	while (enumerator->enumerate(enumerator, &rule, &ptr))
+	{
+		if (rule == AUTH_RULE_EAP_IDENTITY)
+		{
+			cfg->replace(cfg, enumerator, AUTH_RULE_EAP_IDENTITY,
+						 this->eap_identity->clone(this->eap_identity));
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * Handle EAP exchange as server
+ */
+static eap_payload_t* server_process_eap(private_eap_authenticator_t *this,
+										 eap_payload_t *in)
+{
+	eap_type_t type, received_type;
+	u_int32_t vendor, received_vendor;
+	eap_payload_t *out;
+	auth_cfg_t *cfg;
+
+	if (in->get_code(in) != EAP_RESPONSE)
+	{
+		DBG1(DBG_IKE, "received %N, sending %N",
+			 eap_code_names, in->get_code(in), eap_code_names, EAP_FAILURE);
+		return eap_payload_create_code(EAP_FAILURE, in->get_identifier(in));
+	}
+
+	type = this->method->get_type(this->method, &vendor);
+	received_type = in->get_type(in, &received_vendor);
+	if (type != received_type || vendor != received_vendor)
+	{
+		if (received_vendor == 0 && received_type == EAP_NAK)
+		{
+			DBG1(DBG_IKE, "received %N, sending %N",
+				 eap_type_names, EAP_NAK, eap_code_names, EAP_FAILURE);
+		}
+		else
+		{
+			DBG1(DBG_IKE, "received invalid EAP response, sending %N",
+				 eap_code_names, EAP_FAILURE);
+		}
+		return eap_payload_create_code(EAP_FAILURE, in->get_identifier(in));
+	}
+
+	switch (this->method->process(this->method, in, &out))
+	{
+		case NEED_MORE:
+			return out;
+		case SUCCESS:
+			if (!vendor && type == EAP_IDENTITY)
+			{
+				chunk_t data;
+
+				if (this->method->get_msk(this->method, &data) == SUCCESS)
+				{
+					this->eap_identity = identification_create_from_data(data);
+					DBG1(DBG_IKE, "received EAP identity '%Y'",
+						 this->eap_identity);
+					replace_eap_identity(this);
+				}
+				/* restart EAP exchange, but with real method */
+				this->method->destroy(this->method);
+				return server_initiate_eap(this, FALSE);
+			}
+			if (this->method->get_msk(this->method, &this->msk) == SUCCESS)
+			{
+				this->msk = chunk_clone(this->msk);
+			}
+			if (vendor)
+			{
+				DBG1(DBG_IKE, "EAP vendor specific method %d-%d succeeded, "
+					 "%sMSK established", type, vendor,
+					 this->msk.ptr ? "" : "no ");
+			}
+			else
+			{
+				DBG1(DBG_IKE, "EAP method %N succeeded, %sMSK established",
+					 eap_type_names, type, this->msk.ptr ? "" : "no ");
+			}
+			this->ike_sa->set_condition(this->ike_sa, COND_EAP_AUTHENTICATED,
+										TRUE);
+			cfg = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+			cfg->add(cfg, AUTH_RULE_EAP_TYPE, type);
+			if (vendor)
+			{
+				cfg->add(cfg, AUTH_RULE_EAP_VENDOR, vendor);
+			}
+			this->eap_complete = TRUE;
+			return eap_payload_create_code(EAP_SUCCESS, in->get_identifier(in));
+		case FAILED:
+		default:
+			if (vendor)
+			{
+				DBG1(DBG_IKE, "EAP vendor specific method %d-%d failed for "
+					 "peer %Y", type, vendor,
+					 this->ike_sa->get_other_id(this->ike_sa));
+			}
+			else
+			{
+				DBG1(DBG_IKE, "EAP method %N failed for peer %Y",
+					 eap_type_names, type,
+					 this->ike_sa->get_other_id(this->ike_sa));
+			}
+			return eap_payload_create_code(EAP_FAILURE, in->get_identifier(in));
+	}
+}
+
+/**
+ * Processing method for a peer
+ */
+static eap_payload_t* client_process_eap(private_eap_authenticator_t *this,
+										 eap_payload_t *in)
+{
+	eap_type_t type;
+	u_int32_t vendor;
+	auth_cfg_t *auth;
+	eap_payload_t *out;
+	identification_t *id;
+
+	type = in->get_type(in, &vendor);
+
+	if (!vendor && type == EAP_IDENTITY)
+	{
+		DESTROY_IF(this->eap_identity);
+		auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+		id = auth->get(auth, AUTH_RULE_EAP_IDENTITY);
+		if (!id || id->get_type(id) == ID_ANY)
+		{
+			id = this->ike_sa->get_my_id(this->ike_sa);
+		}
+		DBG1(DBG_IKE, "server requested %N, sending '%Y'",
+			 eap_type_names, type, id);
+		this->eap_identity = id->clone(id);
+
+		this->method = load_method(this, type, vendor, EAP_PEER);
+		if (this->method)
+		{
+			if (this->method->process(this->method, in, &out) == SUCCESS)
+			{
+				this->method->destroy(this->method);
+				this->method = NULL;
+				return out;
+			}
+			this->method->destroy(this->method);
+			this->method = NULL;
+		}
+		DBG1(DBG_IKE, "%N not supported, sending EAP_NAK",
+			 eap_type_names, type);
+		return eap_payload_create_nak(in->get_identifier(in));
+	}
+	if (this->method == NULL)
+	{
+		if (vendor)
+		{
+			DBG1(DBG_IKE, "server requested vendor specific EAP method %d-%d",
+				 type, vendor);
+		}
+		else
+		{
+			DBG1(DBG_IKE, "server requested %N authentication",
+				 eap_type_names, type);
+		}
+		this->method = load_method(this, type, vendor, EAP_PEER);
+		if (!this->method)
+		{
+			DBG1(DBG_IKE, "EAP method not supported, sending EAP_NAK");
+			return eap_payload_create_nak(in->get_identifier(in));
+		}
+	}
+
+	type = this->method->get_type(this->method, &vendor);
+
+	if (this->method->process(this->method, in, &out) == NEED_MORE)
+	{	/* client methods should never return SUCCESS */
+		return out;
+	}
+
+	if (vendor)
+	{
+		DBG1(DBG_IKE, "vendor specific EAP method %d-%d failed", type, vendor);
+	}
+	else
+	{
+		DBG1(DBG_IKE, "%N method failed", eap_type_names, type);
+	}
+	return NULL;
+}
+
+/**
+ * Verify AUTH payload
+ */
+static bool verify_auth(private_eap_authenticator_t *this, message_t *message,
+						chunk_t nonce, chunk_t init)
+{
+	auth_payload_t *auth_payload;
+	chunk_t auth_data, recv_auth_data;
+	identification_t *other_id;
+	auth_cfg_t *auth;
+	keymat_t *keymat;
+
+	auth_payload = (auth_payload_t*)message->get_payload(message,
+														 AUTHENTICATION);
+	if (!auth_payload)
+	{
+		DBG1(DBG_IKE, "AUTH payload missing");
+		return FALSE;
+	}
+	other_id = this->ike_sa->get_other_id(this->ike_sa);
+	keymat = this->ike_sa->get_keymat(this->ike_sa);
+	auth_data = keymat->get_psk_sig(keymat, TRUE, init, nonce,
+									this->msk, other_id);
+	recv_auth_data = auth_payload->get_data(auth_payload);
+	if (!auth_data.len || !chunk_equals(auth_data, recv_auth_data))
+	{
+		DBG1(DBG_IKE, "verification of AUTH payload with%s EAP MSK failed",
+			 this->msk.ptr ? "" : "out");
+		chunk_free(&auth_data);
+		return FALSE;
+	}
+	chunk_free(&auth_data);
+
+	DBG1(DBG_IKE, "authentication of '%Y' with %N successful",
+		 other_id, auth_class_names, AUTH_CLASS_EAP);
+	this->auth_complete = TRUE;
+	auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+	auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_EAP);
+	return TRUE;
+}
+
+/**
+ * Build AUTH payload
+ */
+static void build_auth(private_eap_authenticator_t *this, message_t *message,
+					   chunk_t nonce, chunk_t init)
+{
+	auth_payload_t *auth_payload;
+	identification_t *my_id;
+	chunk_t auth_data;
+	keymat_t *keymat;
+
+	my_id = this->ike_sa->get_my_id(this->ike_sa);
+	keymat = this->ike_sa->get_keymat(this->ike_sa);
+
+	DBG1(DBG_IKE, "authentication of '%Y' (myself) with %N",
+		 my_id, auth_class_names, AUTH_CLASS_EAP);
+
+	auth_data = keymat->get_psk_sig(keymat, FALSE, init, nonce, this->msk, my_id);
+	auth_payload = auth_payload_create();
+	auth_payload->set_auth_method(auth_payload, AUTH_PSK);
+	auth_payload->set_data(auth_payload, auth_data);
+	message->add_payload(message, (payload_t*)auth_payload);
+	chunk_free(&auth_data);
+}
+
+/**
+ * Implementation of authenticator_t.process for a server
+ */
+static status_t process_server(private_eap_authenticator_t *this,
+							   message_t *message)
+{
+	eap_payload_t *eap_payload;
+
+	if (this->eap_complete)
+	{
+		if (!verify_auth(this, message, this->sent_nonce, this->received_init))
+		{
+			return FAILED;
+		}
+		return NEED_MORE;
+	}
+
+	if (!this->method)
+	{
+		this->eap_payload = server_initiate_eap(this, TRUE);
+	}
+	else
+	{
+		eap_payload = (eap_payload_t*)message->get_payload(message,
+													EXTENSIBLE_AUTHENTICATION);
+		if (!eap_payload)
+		{
+			return FAILED;
+		}
+		this->eap_payload = server_process_eap(this, eap_payload);
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of authenticator_t.build for a server
+ */
+static status_t build_server(private_eap_authenticator_t *this,
+							 message_t *message)
+{
+	if (this->eap_payload)
+	{
+		eap_code_t code;
+
+		code = this->eap_payload->get_code(this->eap_payload);
+		message->add_payload(message, (payload_t*)this->eap_payload);
+		this->eap_payload = NULL;
+		if (code == EAP_FAILURE)
+		{
+			return FAILED;
+		}
+		return NEED_MORE;
+	}
+	if (this->eap_complete && this->auth_complete)
+	{
+		build_auth(this, message, this->received_nonce, this->sent_init);
+		return SUCCESS;
+	}
+	return FAILED;
+}
+
+/**
+ * Implementation of authenticator_t.process for a client
+ */
+static status_t process_client(private_eap_authenticator_t *this,
+							   message_t *message)
+{
+	eap_payload_t *eap_payload;
+
+	if (this->eap_complete)
+	{
+		if (!verify_auth(this, message, this->sent_nonce, this->received_init))
+		{
+			return FAILED;
+		}
+		if (this->require_mutual && !this->method->is_mutual(this->method))
+		{	/* we require mutual authentication due to EAP-only */
+			u_int32_t vendor;
+
+			DBG1(DBG_IKE, "EAP-only authentication requires a mutual and "
+				 "MSK deriving EAP method, but %N is not",
+				 eap_type_names, this->method->get_type(this->method, &vendor));
+			return FAILED;
+		}
+		return SUCCESS;
+	}
+
+	eap_payload = (eap_payload_t*)message->get_payload(message,
+													EXTENSIBLE_AUTHENTICATION);
+	if (eap_payload)
+	{
+		switch (eap_payload->get_code(eap_payload))
+		{
+			case EAP_REQUEST:
+			{
+				this->eap_payload = client_process_eap(this, eap_payload);
+				if (this->eap_payload)
+				{
+					return NEED_MORE;
+				}
+				return FAILED;
+			}
+			case EAP_SUCCESS:
+			{
+				eap_type_t type;
+				u_int32_t vendor;
+				auth_cfg_t *cfg;
+
+				if (this->method->get_msk(this->method, &this->msk) == SUCCESS)
+				{
+					this->msk = chunk_clone(this->msk);
+				}
+				type = this->method->get_type(this->method, &vendor);
+				if (vendor)
+				{
+					DBG1(DBG_IKE, "EAP vendor specific method %d-%d succeeded, "
+						 "%sMSK established", type, vendor,
+						 this->msk.ptr ? "" : "no ");
+				}
+				else
+				{
+					DBG1(DBG_IKE, "EAP method %N succeeded, %sMSK established",
+						 eap_type_names, type, this->msk.ptr ? "" : "no ");
+				}
+				cfg = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+				cfg->add(cfg, AUTH_RULE_EAP_TYPE, type);
+				if (vendor)
+				{
+					cfg->add(cfg, AUTH_RULE_EAP_VENDOR, vendor);
+				}
+				this->eap_complete = TRUE;
+				return NEED_MORE;
+			}
+			case EAP_FAILURE:
+			default:
+			{
+				DBG1(DBG_IKE, "received %N, EAP authentication failed",
+					 eap_code_names, eap_payload->get_code(eap_payload));
+				return FAILED;
+			}
+		}
+	}
+	return FAILED;
+}
+
+/**
+ * Implementation of authenticator_t.build for a client
+ */
+static status_t build_client(private_eap_authenticator_t *this,
+							 message_t *message)
+{
+	if (this->eap_payload)
+	{
+		message->add_payload(message, (payload_t*)this->eap_payload);
+		this->eap_payload = NULL;
+		return NEED_MORE;
+	}
+	if (this->eap_complete)
+	{
+		build_auth(this, message, this->received_nonce, this->sent_init);
+		return NEED_MORE;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of authenticator_t.is_mutual.
+ */
+static bool is_mutual(private_eap_authenticator_t *this)
+{
+	/* we don't know yet, but insist on it after EAP is complete */
+	this->require_mutual = TRUE;
+	return TRUE;
+}
+
+/**
+ * Implementation of authenticator_t.destroy.
+ */
+static void destroy(private_eap_authenticator_t *this)
+{
+	DESTROY_IF(this->method);
+	DESTROY_IF(this->eap_payload);
+	DESTROY_IF(this->eap_identity);
+	chunk_free(&this->msk);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+eap_authenticator_t *eap_authenticator_create_builder(ike_sa_t *ike_sa,
+									chunk_t received_nonce, chunk_t sent_nonce,
+									chunk_t received_init, chunk_t sent_init)
+{
+	private_eap_authenticator_t *this = malloc_thing(private_eap_authenticator_t);
+
+	this->public.authenticator.build = (status_t(*)(authenticator_t*, message_t *message))build_client;
+	this->public.authenticator.process = (status_t(*)(authenticator_t*, message_t *message))process_client;
+	this->public.authenticator.is_mutual = (bool(*)(authenticator_t*))is_mutual;
+	this->public.authenticator.destroy = (void(*)(authenticator_t*))destroy;
+
+	this->ike_sa = ike_sa;
+	this->received_init = received_init;
+	this->received_nonce = received_nonce;
+	this->sent_init = sent_init;
+	this->sent_nonce = sent_nonce;
+	this->msk = chunk_empty;
+	this->method = NULL;
+	this->eap_payload = NULL;
+	this->eap_complete = FALSE;
+	this->auth_complete = FALSE;
+	this->eap_identity = NULL;
+	this->require_mutual = FALSE;
+
+	return &this->public;
+}
+
+/*
+ * Described in header.
+ */
+eap_authenticator_t *eap_authenticator_create_verifier(ike_sa_t *ike_sa,
+									chunk_t received_nonce, chunk_t sent_nonce,
+									chunk_t received_init, chunk_t sent_init)
+{
+	private_eap_authenticator_t *this = malloc_thing(private_eap_authenticator_t);
+
+	this->public.authenticator.build = (status_t(*)(authenticator_t*, message_t *messageh))build_server;
+	this->public.authenticator.process = (status_t(*)(authenticator_t*, message_t *message))process_server;
+	this->public.authenticator.is_mutual = (bool(*)(authenticator_t*))is_mutual;
+	this->public.authenticator.destroy = (void(*)(authenticator_t*))destroy;
+
+	this->ike_sa = ike_sa;
+	this->received_init = received_init;
+	this->received_nonce = received_nonce;
+	this->sent_init = sent_init;
+	this->sent_nonce = sent_nonce;
+	this->msk = chunk_empty;
+	this->method = NULL;
+	this->eap_payload = NULL;
+	this->eap_complete = FALSE;
+	this->auth_complete = FALSE;
+	this->eap_identity = NULL;
+	this->require_mutual = FALSE;
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/authenticators/eap_authenticator.h b/src/libcharon/sa/authenticators/eap_authenticator.h
new file mode 100644
index 000000000..41eb6a8c9
--- /dev/null
+++ b/src/libcharon/sa/authenticators/eap_authenticator.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2006-2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup eap_authenticator eap_authenticator
+ * @{ @ingroup authenticators
+ */
+
+#ifndef EAP_AUTHENTICATOR_H_
+#define EAP_AUTHENTICATOR_H_
+
+typedef struct eap_authenticator_t eap_authenticator_t;
+
+#include <sa/authenticators/authenticator.h>
+
+/**
+ * Implementation of authenticator_t using EAP authentication.
+ *
+ * Authentication using EAP involves the most complex authenticator. It stays
+ * alive over multiple ike_auth transactions and handles multiple EAP
+ * messages.
+ *
+ * @verbatim
+                          ike_sa_init
+                   ------------------------->
+                   <-------------------------
+                 followed by multiple ike_auth:
+
+     +--------+                                +--------+
+     |  EAP   |       IDi, [IDr,] SA, TS       |  EAP   |
+     | client |  --------------------------->  | server |
+     |        |          ID, AUTH, EAP         |        |
+     |        |  <---------------------------  |        |
+     |        |              EAP               |        |
+     |        |  --------------------------->  |        |
+     |        |              EAP               |        |
+     |        |  <---------------------------  |        |
+     |        |              EAP               |        |
+     |        |  --------------------------->  |        |
+     |        |           EAP(SUCCESS)         |        |
+     |        |  <---------------------------  |        |
+     |        |              AUTH              |        |  If EAP establishes
+     |        |  --------------------------->  |        |  a session key, AUTH
+     |        |          AUTH, SA, TS          |        |  payloads use this
+     |        |  <---------------------------  |        |  key, not SK_pi/pr
+     +--------+                                +--------+
+
+   @endverbatim
+ */
+struct eap_authenticator_t {
+
+	/**
+	 * Implemented authenticator_t interface.
+	 */
+	authenticator_t authenticator;
+};
+
+/**
+ * Create an authenticator to authenticate against an EAP server.
+ *
+ * @param ike_sa			associated ike_sa
+ * @param received_nonce	nonce received in IKE_SA_INIT
+ * @param sent_nonce		nonce sent in IKE_SA_INIT
+ * @param received_init		received IKE_SA_INIT message data
+ * @param sent_init			sent IKE_SA_INIT message data
+ * @return					EAP authenticator
+ */
+eap_authenticator_t *eap_authenticator_create_builder(ike_sa_t *ike_sa,
+									chunk_t received_nonce, chunk_t sent_nonce,
+									chunk_t received_init, chunk_t sent_init);
+
+/**
+ * Create an authenticator to authenticate EAP clients.
+ *
+ * @param ike_sa			associated ike_sa
+ * @param received_nonce	nonce received in IKE_SA_INIT
+ * @param sent_nonce		nonce sent in IKE_SA_INIT
+ * @param received_init		received IKE_SA_INIT message data
+ * @param sent_init			sent IKE_SA_INIT message data
+ * @return					EAP authenticator
+ */
+eap_authenticator_t *eap_authenticator_create_verifier(ike_sa_t *ike_sa,
+									chunk_t received_nonce, chunk_t sent_nonce,
+									chunk_t received_init, chunk_t sent_init);
+
+#endif /** EAP_AUTHENTICATOR_H_ @}*/
diff --git a/src/libcharon/sa/authenticators/psk_authenticator.c b/src/libcharon/sa/authenticators/psk_authenticator.c
new file mode 100644
index 000000000..67197d690
--- /dev/null
+++ b/src/libcharon/sa/authenticators/psk_authenticator.c
@@ -0,0 +1,201 @@
+/*
+ * Copyright (C) 2005-2009 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "psk_authenticator.h"
+
+#include <daemon.h>
+#include <encoding/payloads/auth_payload.h>
+
+typedef struct private_psk_authenticator_t private_psk_authenticator_t;
+
+/**
+ * Private data of an psk_authenticator_t object.
+ */
+struct private_psk_authenticator_t {
+
+	/**
+	 * Public authenticator_t interface.
+	 */
+	psk_authenticator_t public;
+
+	/**
+	 * Assigned IKE_SA
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * nonce to include in AUTH calculation
+	 */
+	chunk_t nonce;
+
+	/**
+	 * IKE_SA_INIT message data to include in AUTH calculation
+	 */
+	chunk_t ike_sa_init;
+};
+
+/*
+ * Implementation of authenticator_t.build for builder
+ */
+static status_t build(private_psk_authenticator_t *this, message_t *message)
+{
+	identification_t *my_id, *other_id;
+	auth_payload_t *auth_payload;
+	shared_key_t *key;
+	chunk_t auth_data;
+	keymat_t *keymat;
+
+	keymat = this->ike_sa->get_keymat(this->ike_sa);
+	my_id = this->ike_sa->get_my_id(this->ike_sa);
+	other_id = this->ike_sa->get_other_id(this->ike_sa);
+	DBG1(DBG_IKE, "authentication of '%Y' (myself) with %N",
+		 my_id, auth_method_names, AUTH_PSK);
+	key = charon->credentials->get_shared(charon->credentials, SHARED_IKE,
+										  my_id, other_id);
+	if (key == NULL)
+	{
+		DBG1(DBG_IKE, "no shared key found for '%Y' - '%Y'", my_id, other_id);
+		return NOT_FOUND;
+	}
+	auth_data = keymat->get_psk_sig(keymat, FALSE, this->ike_sa_init,
+									this->nonce, key->get_key(key), my_id);
+	key->destroy(key);
+	DBG2(DBG_IKE, "successfully created shared key MAC");
+	auth_payload = auth_payload_create();
+	auth_payload->set_auth_method(auth_payload, AUTH_PSK);
+	auth_payload->set_data(auth_payload, auth_data);
+	chunk_free(&auth_data);
+	message->add_payload(message, (payload_t*)auth_payload);
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of authenticator_t.process for verifier
+ */
+static status_t process(private_psk_authenticator_t *this, message_t *message)
+{
+	chunk_t auth_data, recv_auth_data;
+	identification_t *my_id, *other_id;
+	auth_payload_t *auth_payload;
+	auth_cfg_t *auth;
+	shared_key_t *key;
+	enumerator_t *enumerator;
+	bool authenticated = FALSE;
+	int keys_found = 0;
+	keymat_t *keymat;
+
+	auth_payload = (auth_payload_t*)message->get_payload(message, AUTHENTICATION);
+	if (!auth_payload)
+	{
+		return FAILED;
+	}
+	keymat = this->ike_sa->get_keymat(this->ike_sa);
+	recv_auth_data = auth_payload->get_data(auth_payload);
+	my_id = this->ike_sa->get_my_id(this->ike_sa);
+	other_id = this->ike_sa->get_other_id(this->ike_sa);
+	enumerator = charon->credentials->create_shared_enumerator(
+							charon->credentials, SHARED_IKE, my_id, other_id);
+	while (!authenticated && enumerator->enumerate(enumerator, &key, NULL, NULL))
+	{
+		keys_found++;
+
+		auth_data = keymat->get_psk_sig(keymat, TRUE, this->ike_sa_init,
+									this->nonce, key->get_key(key), other_id);
+		if (auth_data.len && chunk_equals(auth_data, recv_auth_data))
+		{
+			DBG1(DBG_IKE, "authentication of '%Y' with %N successful",
+				 other_id, auth_method_names, AUTH_PSK);
+			authenticated = TRUE;
+		}
+		chunk_free(&auth_data);
+	}
+	enumerator->destroy(enumerator);
+
+	if (!authenticated)
+	{
+		if (keys_found == 0)
+		{
+			DBG1(DBG_IKE, "no shared key found for '%Y' - '%Y'", my_id, other_id);
+			return NOT_FOUND;
+		}
+		DBG1(DBG_IKE, "tried %d shared key%s for '%Y' - '%Y', but MAC mismatched",
+			 keys_found, keys_found == 1 ? "" : "s", my_id, other_id);
+		return FAILED;
+	}
+
+	auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+	auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PSK);
+	return SUCCESS;
+}
+
+/**
+ * Implementation of authenticator_t.process for builder
+ * Implementation of authenticator_t.build for verifier
+ */
+static status_t return_failed()
+{
+	return FAILED;
+}
+
+/**
+ * Implementation of authenticator_t.destroy.
+ */
+static void destroy(private_psk_authenticator_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+psk_authenticator_t *psk_authenticator_create_builder(ike_sa_t *ike_sa,
+									chunk_t received_nonce, chunk_t sent_init)
+{
+	private_psk_authenticator_t *this = malloc_thing(private_psk_authenticator_t);
+
+	this->public.authenticator.build = (status_t(*)(authenticator_t*, message_t *message))build;
+	this->public.authenticator.process = (status_t(*)(authenticator_t*, message_t *message))return_failed;
+	this->public.authenticator.is_mutual = (bool(*)(authenticator_t*))return_false;
+	this->public.authenticator.destroy = (void(*)(authenticator_t*))destroy;
+
+	this->ike_sa = ike_sa;
+	this->ike_sa_init = sent_init;
+	this->nonce = received_nonce;
+
+	return &this->public;
+}
+
+/*
+ * Described in header.
+ */
+psk_authenticator_t *psk_authenticator_create_verifier(ike_sa_t *ike_sa,
+									chunk_t sent_nonce, chunk_t received_init)
+{
+	private_psk_authenticator_t *this = malloc_thing(private_psk_authenticator_t);
+
+	this->public.authenticator.build = (status_t(*)(authenticator_t*, message_t *messageh))return_failed;
+	this->public.authenticator.process = (status_t(*)(authenticator_t*, message_t *message))process;
+	this->public.authenticator.is_mutual = (bool(*)(authenticator_t*))return_false;
+	this->public.authenticator.destroy = (void(*)(authenticator_t*))destroy;
+
+	this->ike_sa = ike_sa;
+	this->ike_sa_init = received_init;
+	this->nonce = sent_nonce;
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/authenticators/psk_authenticator.h b/src/libcharon/sa/authenticators/psk_authenticator.h
new file mode 100644
index 000000000..0fab11095
--- /dev/null
+++ b/src/libcharon/sa/authenticators/psk_authenticator.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2006-2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup psk_authenticator psk_authenticator
+ * @{ @ingroup authenticators
+ */
+
+#ifndef PSK_AUTHENTICATOR_H_
+#define PSK_AUTHENTICATOR_H_
+
+typedef struct psk_authenticator_t psk_authenticator_t;
+
+#include <sa/authenticators/authenticator.h>
+
+/**
+ * Implementation of authenticator_t using pre-shared keys.
+ */
+struct psk_authenticator_t {
+
+	/**
+	 * Implemented authenticator_t interface.
+	 */
+	authenticator_t authenticator;
+};
+
+/**
+ * Create an authenticator to build PSK signatures.
+ *
+ * @param ike_sa			associated ike_sa
+ * @param received_nonce	nonce received in IKE_SA_INIT
+ * @param sent_init			sent IKE_SA_INIT message data
+ * @return					PSK authenticator
+ */
+psk_authenticator_t *psk_authenticator_create_builder(ike_sa_t *ike_sa,
+									chunk_t received_nonce, chunk_t sent_init);
+
+/**
+ * Create an authenticator to verify PSK signatures.
+ *
+ * @param ike_sa			associated ike_sa
+ * @param sent_nonce		nonce sent in IKE_SA_INIT
+ * @param received_init		received IKE_SA_INIT message data
+ * @return					PSK authenticator
+ */
+psk_authenticator_t *psk_authenticator_create_verifier(ike_sa_t *ike_sa,
+									chunk_t sent_nonce, chunk_t received_init);
+
+#endif /** PSK_AUTHENTICATOR_H_ @}*/
diff --git a/src/libcharon/sa/authenticators/pubkey_authenticator.c b/src/libcharon/sa/authenticators/pubkey_authenticator.c
new file mode 100644
index 000000000..f1dca2702
--- /dev/null
+++ b/src/libcharon/sa/authenticators/pubkey_authenticator.c
@@ -0,0 +1,265 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2005-2009 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "pubkey_authenticator.h"
+
+#include <daemon.h>
+#include <encoding/payloads/auth_payload.h>
+
+typedef struct private_pubkey_authenticator_t private_pubkey_authenticator_t;
+
+/**
+ * Private data of an pubkey_authenticator_t object.
+ */
+struct private_pubkey_authenticator_t {
+
+	/**
+	 * Public authenticator_t interface.
+	 */
+	pubkey_authenticator_t public;
+
+	/**
+	 * Assigned IKE_SA
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * nonce to include in AUTH calculation
+	 */
+	chunk_t nonce;
+
+	/**
+	 * IKE_SA_INIT message data to include in AUTH calculation
+	 */
+	chunk_t ike_sa_init;
+};
+
+/**
+ * Implementation of authenticator_t.build for builder
+ */
+static status_t build(private_pubkey_authenticator_t *this, message_t *message)
+{
+	chunk_t octets, auth_data;
+	status_t status = FAILED;
+	private_key_t *private;
+	identification_t *id;
+	auth_cfg_t *auth;
+	auth_payload_t *auth_payload;
+	auth_method_t auth_method;
+	signature_scheme_t scheme;
+	keymat_t *keymat;
+
+	id = this->ike_sa->get_my_id(this->ike_sa);
+	auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+	private = charon->credentials->get_private(charon->credentials, KEY_ANY,
+											   id, auth);
+	if (private == NULL)
+	{
+		DBG1(DBG_IKE, "no private key found for '%Y'", id);
+		return NOT_FOUND;
+	}
+
+	switch (private->get_type(private))
+	{
+		case KEY_RSA:
+			/* we currently use always SHA1 for signatures,
+			 * TODO: support other hashes depending on configuration/auth */
+			scheme = SIGN_RSA_EMSA_PKCS1_SHA1;
+			auth_method = AUTH_RSA;
+			break;
+		case KEY_ECDSA:
+			/* we try to deduct the signature scheme from the keysize */
+			switch (private->get_keysize(private))
+			{
+				case 32:
+					scheme = SIGN_ECDSA_256;
+					auth_method = AUTH_ECDSA_256;
+					break;
+				case 48:
+					scheme = SIGN_ECDSA_384;
+					auth_method = AUTH_ECDSA_384;
+					break;
+				case 66:
+					scheme = SIGN_ECDSA_521;
+					auth_method = AUTH_ECDSA_521;
+					break;
+				default:
+					DBG1(DBG_IKE, "%d bit ECDSA private key size not supported",
+							private->get_keysize(private));
+					return status;
+			}
+			break;
+		default:
+			DBG1(DBG_IKE, "private key of type %N not supported",
+					key_type_names, private->get_type(private));
+			return status;
+	}
+	keymat = this->ike_sa->get_keymat(this->ike_sa);
+	octets = keymat->get_auth_octets(keymat, FALSE, this->ike_sa_init,
+									 this->nonce, id);
+	if (private->sign(private, scheme, octets, &auth_data))
+	{
+		auth_payload = auth_payload_create();
+		auth_payload->set_auth_method(auth_payload, auth_method);
+		auth_payload->set_data(auth_payload, auth_data);
+		chunk_free(&auth_data);
+		message->add_payload(message, (payload_t*)auth_payload);
+		status = SUCCESS;
+	}
+	DBG1(DBG_IKE, "authentication of '%Y' (myself) with %N %s", id,
+		 auth_method_names, auth_method,
+		 (status == SUCCESS)? "successful":"failed");
+	chunk_free(&octets);
+	private->destroy(private);
+
+	return status;
+}
+
+/**
+ * Implementation of authenticator_t.process for verifier
+ */
+static status_t process(private_pubkey_authenticator_t *this, message_t *message)
+{
+	public_key_t *public;
+	auth_method_t auth_method;
+	auth_payload_t *auth_payload;
+	chunk_t auth_data, octets;
+	identification_t *id;
+	auth_cfg_t *auth, *current_auth;
+	enumerator_t *enumerator;
+	key_type_t key_type = KEY_ECDSA;
+	signature_scheme_t scheme;
+	status_t status = NOT_FOUND;
+	keymat_t *keymat;
+
+	auth_payload = (auth_payload_t*)message->get_payload(message, AUTHENTICATION);
+	if (!auth_payload)
+	{
+		return FAILED;
+	}
+	auth_method = auth_payload->get_auth_method(auth_payload);
+	switch (auth_method)
+	{
+		case AUTH_RSA:
+			/* We currently accept SHA1 signatures only
+			 * TODO: allow other hash algorithms and note it in "auth" */
+			key_type = KEY_RSA;
+			scheme = SIGN_RSA_EMSA_PKCS1_SHA1;
+			break;
+		case AUTH_ECDSA_256:
+			scheme = SIGN_ECDSA_256;
+			break;
+		case AUTH_ECDSA_384:
+			scheme = SIGN_ECDSA_384;
+			break;
+		case AUTH_ECDSA_521:
+			scheme = SIGN_ECDSA_521;
+			break;
+		default:
+			return INVALID_ARG;
+	}
+	auth_data = auth_payload->get_data(auth_payload);
+	id = this->ike_sa->get_other_id(this->ike_sa);
+	keymat = this->ike_sa->get_keymat(this->ike_sa);
+	octets = keymat->get_auth_octets(keymat, TRUE, this->ike_sa_init,
+									 this->nonce, id);
+	auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+	enumerator = charon->credentials->create_public_enumerator(
+										charon->credentials, key_type, id, auth);
+	while (enumerator->enumerate(enumerator, &public, &current_auth))
+	{
+		if (public->verify(public, scheme, octets, auth_data))
+		{
+			DBG1(DBG_IKE, "authentication of '%Y' with %N successful",
+						   id, auth_method_names, auth_method);
+			status = SUCCESS;
+			auth->merge(auth, current_auth, FALSE);
+			auth->add(auth, AUTH_RULE_AUTH_CLASS, AUTH_CLASS_PUBKEY);
+			break;
+		}
+		else
+		{
+			status = FAILED;
+			DBG1(DBG_IKE, "signature validation failed, looking for another key");
+		}
+	}
+	enumerator->destroy(enumerator);
+	chunk_free(&octets);
+	if (status == NOT_FOUND)
+	{
+		DBG1(DBG_IKE, "no trusted %N public key found for '%Y'",
+			 key_type_names, key_type, id);
+	}
+	return status;
+}
+
+/**
+ * Implementation of authenticator_t.process for builder
+ * Implementation of authenticator_t.build for verifier
+ */
+static status_t return_failed()
+{
+	return FAILED;
+}
+
+/**
+ * Implementation of authenticator_t.destroy.
+ */
+static void destroy(private_pubkey_authenticator_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+pubkey_authenticator_t *pubkey_authenticator_create_builder(ike_sa_t *ike_sa,
+									chunk_t received_nonce, chunk_t sent_init)
+{
+	private_pubkey_authenticator_t *this = malloc_thing(private_pubkey_authenticator_t);
+
+	this->public.authenticator.build = (status_t(*)(authenticator_t*, message_t *message))build;
+	this->public.authenticator.process = (status_t(*)(authenticator_t*, message_t *message))return_failed;
+	this->public.authenticator.is_mutual = (bool(*)(authenticator_t*))return_false;
+	this->public.authenticator.destroy = (void(*)(authenticator_t*))destroy;
+
+	this->ike_sa = ike_sa;
+	this->ike_sa_init = sent_init;
+	this->nonce = received_nonce;
+
+	return &this->public;
+}
+
+/*
+ * Described in header.
+ */
+pubkey_authenticator_t *pubkey_authenticator_create_verifier(ike_sa_t *ike_sa,
+									chunk_t sent_nonce, chunk_t received_init)
+{
+	private_pubkey_authenticator_t *this = malloc_thing(private_pubkey_authenticator_t);
+
+	this->public.authenticator.build = (status_t(*)(authenticator_t*, message_t *message))return_failed;
+	this->public.authenticator.process = (status_t(*)(authenticator_t*, message_t *message))process;
+	this->public.authenticator.is_mutual = (bool(*)(authenticator_t*))return_false;
+	this->public.authenticator.destroy = (void(*)(authenticator_t*))destroy;
+
+	this->ike_sa = ike_sa;
+	this->ike_sa_init = received_init;
+	this->nonce = sent_nonce;
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/authenticators/pubkey_authenticator.h b/src/libcharon/sa/authenticators/pubkey_authenticator.h
new file mode 100644
index 000000000..be369cb89
--- /dev/null
+++ b/src/libcharon/sa/authenticators/pubkey_authenticator.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2006-2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup pubkey_authenticator pubkey_authenticator
+ * @{ @ingroup authenticators
+ */
+
+#ifndef PUBKEY_AUTHENTICATOR_H_
+#define PUBKEY_AUTHENTICATOR_H_
+
+typedef struct pubkey_authenticator_t pubkey_authenticator_t;
+
+#include <sa/authenticators/authenticator.h>
+
+/**
+ * Implementation of authenticator_t using public key authenitcation.
+ */
+struct pubkey_authenticator_t {
+
+	/**
+	 * Implemented authenticator_t interface.
+	 */
+	authenticator_t authenticator;
+};
+
+/**
+ * Create an authenticator to build public key signatures.
+ *
+ * @param ike_sa			associated ike_sa
+ * @param received_nonce	nonce received in IKE_SA_INIT
+ * @param sent_init			sent IKE_SA_INIT message data
+ * @return					public key authenticator
+ */
+pubkey_authenticator_t *pubkey_authenticator_create_builder(ike_sa_t *ike_sa,
+									chunk_t received_nonce, chunk_t sent_init);
+
+/**
+ * Create an authenticator to verify public key signatures.
+ *
+ * @param ike_sa			associated ike_sa
+ * @param sent_nonce		nonce sent in IKE_SA_INIT
+ * @param received_init		received IKE_SA_INIT message data
+ * @return					public key authenticator
+ */
+pubkey_authenticator_t *pubkey_authenticator_create_verifier(ike_sa_t *ike_sa,
+									chunk_t sent_nonce, chunk_t received_init);
+
+#endif /** PUBKEY_AUTHENTICATOR_H_ @}*/
diff --git a/src/libcharon/sa/child_sa.c b/src/libcharon/sa/child_sa.c
new file mode 100644
index 000000000..3fdfb51ad
--- /dev/null
+++ b/src/libcharon/sa/child_sa.c
@@ -0,0 +1,1015 @@
+/*
+ * Copyright (C) 2006-2009 Tobias Brunner
+ * Copyright (C) 2005-2008 Martin Willi
+ * Copyright (C) 2006 Daniel Roethlisberger
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#define _GNU_SOURCE
+#include "child_sa.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+
+#include <daemon.h>
+
+ENUM(child_sa_state_names, CHILD_CREATED, CHILD_DESTROYING,
+	"CREATED",
+	"ROUTED",
+	"INSTALLING",
+	"INSTALLED",
+	"UPDATING",
+	"REKEYING",
+	"DELETING",
+	"DESTROYING",
+);
+
+typedef struct private_child_sa_t private_child_sa_t;
+
+/**
+ * Private data of a child_sa_t object.
+ */
+struct private_child_sa_t {
+	/**
+	 * Public interface of child_sa_t.
+	 */
+	child_sa_t public;
+
+	/**
+	 * address of us
+	 */
+	host_t *my_addr;
+
+	/**
+	 * address of remote
+	 */
+	host_t *other_addr;
+
+	/**
+	 * our actually used SPI, 0 if unused
+	 */
+	u_int32_t my_spi;
+
+	/**
+	 * others used SPI, 0 if unused
+	 */
+	u_int32_t other_spi;
+
+	/**
+	 * our Compression Parameter Index (CPI) used, 0 if unused
+	 */
+	u_int16_t my_cpi;
+
+	/**
+	 * others Compression Parameter Index (CPI) used, 0 if unused
+	 */
+	u_int16_t other_cpi;
+
+	/**
+	 * List for local traffic selectors
+	 */
+	linked_list_t *my_ts;
+
+	/**
+	 * List for remote traffic selectors
+	 */
+	linked_list_t *other_ts;
+
+	/**
+	 * Protocol used to protect this SA, ESP|AH
+	 */
+	protocol_id_t protocol;
+
+	/**
+	 * reqid used for this child_sa
+	 */
+	u_int32_t reqid;
+
+	/**
+	 * absolute time when rekeying is scheduled
+	 */
+	time_t rekey_time;
+
+	/**
+	 * absolute time when the SA expires
+	 */
+	time_t expire_time;
+
+	/**
+	 * state of the CHILD_SA
+	 */
+	child_sa_state_t state;
+
+	/**
+	 * Specifies if UDP encapsulation is enabled (NAT traversal)
+	 */
+	bool encap;
+
+	/**
+	 * Specifies the IPComp transform used (IPCOMP_NONE if disabled)
+	 */
+	ipcomp_transform_t ipcomp;
+
+	/**
+	 * mode this SA uses, tunnel/transport
+	 */
+	ipsec_mode_t mode;
+
+	/**
+	 * selected proposal
+	 */
+	proposal_t *proposal;
+
+	/**
+	 * config used to create this child
+	 */
+	child_cfg_t *config;
+
+	/**
+	 * time of last use in seconds (inbound)
+	 */
+	u_int32_t my_usetime;
+
+	/**
+	 * time of last use in seconds (outbound)
+	 */
+	u_int32_t other_usetime;
+
+	/**
+	 * last number of inbound bytes
+	 */
+	u_int64_t my_usebytes;
+
+	/**
+	 * last number of outbound bytes
+	 */
+	u_int64_t other_usebytes;
+};
+
+/**
+ * Implementation of child_sa_t.get_name
+ */
+static char *get_name(private_child_sa_t *this)
+{
+	return this->config->get_name(this->config);
+}
+
+/**
+ * Implements child_sa_t.get_reqid
+ */
+static u_int32_t get_reqid(private_child_sa_t *this)
+{
+	return this->reqid;
+}
+
+/**
+ * Implements child_sa_t.get_config
+ */
+static child_cfg_t* get_config(private_child_sa_t *this)
+{
+	return this->config;
+}
+
+/**
+ * Implements child_sa_t.set_state
+ */
+static void set_state(private_child_sa_t *this, child_sa_state_t state)
+{
+	charon->bus->child_state_change(charon->bus, &this->public, state);
+	this->state = state;
+}
+
+/**
+ * Implements child_sa_t.get_state
+ */
+static child_sa_state_t get_state(private_child_sa_t *this)
+{
+	return this->state;
+}
+
+/**
+ * Implements child_sa_t.get_spi
+ */
+u_int32_t get_spi(private_child_sa_t *this, bool inbound)
+{
+	return inbound ? this->my_spi : this->other_spi;
+}
+
+/**
+ * Implements child_sa_t.get_cpi
+ */
+u_int16_t get_cpi(private_child_sa_t *this, bool inbound)
+{
+	return inbound ? this->my_cpi : this->other_cpi;
+}
+
+/**
+ * Implements child_sa_t.get_protocol
+ */
+protocol_id_t get_protocol(private_child_sa_t *this)
+{
+	return this->protocol;
+}
+
+/**
+ * Implementation of child_sa_t.set_protocol
+ */
+static void set_protocol(private_child_sa_t *this, protocol_id_t protocol)
+{
+	this->protocol = protocol;
+}
+
+/**
+ * Implementation of child_sa_t.get_mode
+ */
+static ipsec_mode_t get_mode(private_child_sa_t *this)
+{
+	return this->mode;
+}
+
+/**
+ * Implementation of child_sa_t.set_mode
+ */
+static void set_mode(private_child_sa_t *this, ipsec_mode_t mode)
+{
+	this->mode = mode;
+}
+
+/**
+ * Implementation of child_sa_t.has_encap
+ */
+static bool has_encap(private_child_sa_t *this)
+{
+	return this->encap;
+}
+
+/**
+ * Implementation of child_sa_t.get_ipcomp
+ */
+static ipcomp_transform_t get_ipcomp(private_child_sa_t *this)
+{
+	return this->ipcomp;
+}
+
+/**
+ * Implementation of child_sa_t.set_ipcomp.
+ */
+static void set_ipcomp(private_child_sa_t *this, ipcomp_transform_t ipcomp)
+{
+	this->ipcomp = ipcomp;
+}
+
+/**
+ * Implementation of child_sa_t.get_proposal
+ */
+static proposal_t* get_proposal(private_child_sa_t *this)
+{
+	return this->proposal;
+}
+
+/**
+ * Implementation of child_sa_t.set_proposal
+ */
+static void set_proposal(private_child_sa_t *this, proposal_t *proposal)
+{
+	this->proposal = proposal->clone(proposal);
+}
+
+/**
+ * Implementation of child_sa_t.get_traffic_selectors.
+ */
+static linked_list_t *get_traffic_selectors(private_child_sa_t *this, bool local)
+{
+	return local ? this->my_ts : this->other_ts;
+}
+
+typedef struct policy_enumerator_t policy_enumerator_t;
+
+/**
+ * Private policy enumerator
+ */
+struct policy_enumerator_t {
+	/** implements enumerator_t */
+	enumerator_t public;
+	/** enumerator over own TS */
+	enumerator_t *mine;
+	/** enumerator over others TS */
+	enumerator_t *other;
+	/** list of others TS, to recreate enumerator */
+	linked_list_t *list;
+	/** currently enumerating TS for "me" side */
+	traffic_selector_t *ts;
+};
+
+/**
+ * enumerator function of create_policy_enumerator()
+ */
+static bool policy_enumerate(policy_enumerator_t *this,
+				 traffic_selector_t **my_out, traffic_selector_t **other_out)
+{
+	traffic_selector_t *other_ts;
+
+	while (this->ts || this->mine->enumerate(this->mine, &this->ts))
+	{
+		if (!this->other->enumerate(this->other, &other_ts))
+		{	/* end of others list, restart with new of mine */
+			this->other->destroy(this->other);
+			this->other = this->list->create_enumerator(this->list);
+			this->ts = NULL;
+			continue;
+		}
+		if (this->ts->get_type(this->ts) != other_ts->get_type(other_ts))
+		{	/* family mismatch */
+			continue;
+		}
+		if (this->ts->get_protocol(this->ts) &&
+			other_ts->get_protocol(other_ts) &&
+			this->ts->get_protocol(this->ts) != other_ts->get_protocol(other_ts))
+		{	/* protocol mismatch */
+			continue;
+		}
+		*my_out = this->ts;
+		*other_out = other_ts;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+/**
+ * destroy function of create_policy_enumerator()
+ */
+static void policy_destroy(policy_enumerator_t *this)
+{
+	this->mine->destroy(this->mine);
+	this->other->destroy(this->other);
+	free(this);
+}
+
+/**
+ * Implementation of child_sa_t.create_policy_enumerator
+ */
+static enumerator_t* create_policy_enumerator(private_child_sa_t *this)
+{
+	policy_enumerator_t *e = malloc_thing(policy_enumerator_t);
+
+	e->public.enumerate = (void*)policy_enumerate;
+	e->public.destroy = (void*)policy_destroy;
+	e->mine = this->my_ts->create_enumerator(this->my_ts);
+	e->other = this->other_ts->create_enumerator(this->other_ts);
+	e->list = this->other_ts;
+	e->ts = NULL;
+
+	return &e->public;
+}
+
+/**
+ * update the cached usebytes
+ * returns SUCCESS if the usebytes have changed, FAILED if not or no SPIs
+ * are available, and NOT_SUPPORTED if the kernel interface does not support
+ * querying the usebytes.
+ */
+static status_t update_usebytes(private_child_sa_t *this, bool inbound)
+{
+	status_t status = FAILED;
+	u_int64_t bytes;
+
+	if (inbound)
+	{
+		if (this->my_spi)
+		{
+			status = charon->kernel_interface->query_sa(
+									charon->kernel_interface,
+									this->other_addr, this->my_addr,
+									this->my_spi, this->protocol, &bytes);
+			if (status == SUCCESS)
+			{
+				if (bytes > this->my_usebytes)
+				{
+					this->my_usebytes = bytes;
+					return SUCCESS;
+				}
+				return FAILED;
+			}
+		}
+	}
+	else
+	{
+		if (this->other_spi)
+		{
+			status = charon->kernel_interface->query_sa(
+									charon->kernel_interface,
+									this->my_addr, this->other_addr,
+									this->other_spi, this->protocol, &bytes);
+			if (status == SUCCESS)
+			{
+				if (bytes > this->other_usebytes)
+				{
+					this->other_usebytes = bytes;
+					return SUCCESS;
+				}
+				return FAILED;
+			}
+		}
+	}
+	return status;
+}
+
+/**
+ * updates the cached usetime
+ */
+static void update_usetime(private_child_sa_t *this, bool inbound)
+{
+	enumerator_t *enumerator;
+	traffic_selector_t *my_ts, *other_ts;
+	u_int32_t last_use = 0;
+
+	enumerator = create_policy_enumerator(this);
+	while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
+	{
+		u_int32_t in, out, fwd;
+
+		if (inbound)
+		{
+			if (charon->kernel_interface->query_policy(charon->kernel_interface,
+								other_ts, my_ts, POLICY_IN, &in) == SUCCESS)
+			{
+				last_use = max(last_use, in);
+			}
+			if (this->mode != MODE_TRANSPORT)
+			{
+				if (charon->kernel_interface->query_policy(charon->kernel_interface,
+								other_ts, my_ts, POLICY_FWD, &fwd) == SUCCESS)
+				{
+					last_use = max(last_use, fwd);
+				}
+			}
+		}
+		else
+		{
+			if (charon->kernel_interface->query_policy(charon->kernel_interface,
+								my_ts, other_ts, POLICY_OUT, &out) == SUCCESS)
+			{
+				last_use = max(last_use, out);
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	if (last_use == 0)
+	{
+		return;
+	}
+	if (inbound)
+	{
+		this->my_usetime = last_use;
+	}
+	else
+	{
+		this->other_usetime = last_use;
+	}
+}
+
+/**
+ * Implementation of child_sa_t.get_usestats
+ */
+static void get_usestats(private_child_sa_t *this, bool inbound,
+						 time_t *time, u_int64_t *bytes)
+{
+	if (update_usebytes(this, inbound) != FAILED)
+	{
+		/* there was traffic since last update or the kernel interface
+		 * does not support querying the number of usebytes.
+		 */
+		update_usetime(this, inbound);
+	}
+	if (time)
+	{
+		*time = inbound ? this->my_usetime : this->other_usetime;
+	}
+	if (bytes)
+	{
+		*bytes = inbound ? this->my_usebytes : this->other_usebytes;
+	}
+}
+
+/**
+ * Implementation of child_sa_t.get_lifetime
+ */
+static time_t get_lifetime(private_child_sa_t *this, bool hard)
+{
+	return hard ? this->expire_time : this->rekey_time;
+}
+
+/**
+ * Implementation of child_sa_t.alloc_spi
+ */
+static u_int32_t alloc_spi(private_child_sa_t *this, protocol_id_t protocol)
+{
+	if (charon->kernel_interface->get_spi(charon->kernel_interface,
+							this->other_addr, this->my_addr, protocol,
+							this->reqid, &this->my_spi) == SUCCESS)
+	{
+		return this->my_spi;
+	}
+	return 0;
+}
+
+/**
+ * Implementation of child_sa_t.alloc_cpi
+ */
+static u_int16_t alloc_cpi(private_child_sa_t *this)
+{
+	if (charon->kernel_interface->get_cpi(charon->kernel_interface,
+					this->other_addr, this->my_addr, this->reqid,
+					&this->my_cpi) == SUCCESS)
+	{
+		return this->my_cpi;
+	}
+	return 0;
+}
+
+/**
+ * Implementation of child_sa_t.install
+ */
+static status_t install(private_child_sa_t *this, chunk_t encr, chunk_t integ,
+						u_int32_t spi, u_int16_t cpi, bool inbound,
+						linked_list_t *my_ts, linked_list_t *other_ts)
+{
+	u_int16_t enc_alg = ENCR_UNDEFINED, int_alg = AUTH_UNDEFINED, size;
+	traffic_selector_t *src_ts = NULL, *dst_ts = NULL;
+	time_t now;
+	lifetime_cfg_t *lifetime;
+	host_t *src, *dst;
+	status_t status;
+	bool update = FALSE;
+
+	/* now we have to decide which spi to use. Use self allocated, if "in",
+	 * or the one in the proposal, if not "in" (others). Additionally,
+	 * source and dest host switch depending on the role */
+	if (inbound)
+	{
+		dst = this->my_addr;
+		src = this->other_addr;
+		if (this->my_spi == spi)
+		{	/* alloc_spi has been called, do an SA update */
+			update = TRUE;
+		}
+		this->my_spi = spi;
+		this->my_cpi = cpi;
+	}
+	else
+	{
+		src = this->my_addr;
+		dst = this->other_addr;
+		this->other_spi = spi;
+		this->other_cpi = cpi;
+	}
+
+	DBG2(DBG_CHD, "adding %s %N SA", inbound ? "inbound" : "outbound",
+		 protocol_id_names, this->protocol);
+
+	/* send SA down to the kernel */
+	DBG2(DBG_CHD, "  SPI 0x%.8x, src %H dst %H", ntohl(spi), src, dst);
+
+	this->proposal->get_algorithm(this->proposal, ENCRYPTION_ALGORITHM,
+								  &enc_alg, &size);
+	this->proposal->get_algorithm(this->proposal, INTEGRITY_ALGORITHM,
+								  &int_alg, &size);
+
+	lifetime = this->config->get_lifetime(this->config);
+
+	now = time_monotonic(NULL);
+	if (lifetime->time.rekey)
+	{
+		this->rekey_time = now + lifetime->time.rekey;
+	}
+	if (lifetime->time.life)
+	{
+		this->expire_time = now + lifetime->time.life;
+	}
+
+	if (!lifetime->time.jitter && !inbound)
+	{	/* avoid triggering multiple rekey events */
+		lifetime->time.rekey = 0;
+	}
+
+	if (this->mode == MODE_BEET)
+	{
+		/* BEET requires the bound address from the traffic selectors.
+		 * TODO: We add just the first traffic selector for now, as the
+		 * kernel accepts a single TS per SA only */
+		if (inbound)
+		{
+			my_ts->get_first(my_ts, (void**)&dst_ts);
+			other_ts->get_first(other_ts, (void**)&src_ts);
+		}
+		else
+		{
+			my_ts->get_first(my_ts, (void**)&src_ts);
+			other_ts->get_first(other_ts, (void**)&dst_ts);
+		}
+	}
+
+	status = charon->kernel_interface->add_sa(charon->kernel_interface,
+				src, dst, spi, this->protocol, this->reqid, lifetime,
+				enc_alg, encr, int_alg, integ, this->mode, this->ipcomp, cpi,
+				this->encap, update, src_ts, dst_ts);
+
+	free(lifetime);
+
+	return status;
+}
+
+/**
+ * Implementation of child_sa_t.add_policies
+ */
+static status_t add_policies(private_child_sa_t *this,
+					linked_list_t *my_ts_list, linked_list_t *other_ts_list)
+{
+	enumerator_t *enumerator;
+	traffic_selector_t *my_ts, *other_ts;
+	status_t status = SUCCESS;
+	bool routed = (this->state == CHILD_CREATED);
+
+	/* apply traffic selectors */
+	enumerator = my_ts_list->create_enumerator(my_ts_list);
+	while (enumerator->enumerate(enumerator, &my_ts))
+	{
+		this->my_ts->insert_last(this->my_ts, my_ts->clone(my_ts));
+	}
+	enumerator->destroy(enumerator);
+	enumerator = other_ts_list->create_enumerator(other_ts_list);
+	while (enumerator->enumerate(enumerator, &other_ts))
+	{
+		this->other_ts->insert_last(this->other_ts, other_ts->clone(other_ts));
+	}
+	enumerator->destroy(enumerator);
+
+	if (this->config->install_policy(this->config))
+	{
+		/* enumerate pairs of traffic selectors */
+		enumerator = create_policy_enumerator(this);
+		while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
+		{
+			/* install 3 policies: out, in and forward */
+			status |= charon->kernel_interface->add_policy(charon->kernel_interface,
+					this->my_addr, this->other_addr, my_ts, other_ts, POLICY_OUT,
+					this->other_spi, this->protocol, this->reqid, this->mode,
+					this->ipcomp, this->other_cpi, routed);
+
+			status |= charon->kernel_interface->add_policy(charon->kernel_interface,
+					this->other_addr, this->my_addr, other_ts, my_ts, POLICY_IN,
+					this->my_spi, this->protocol, this->reqid, this->mode,
+					this->ipcomp, this->my_cpi, routed);
+			if (this->mode != MODE_TRANSPORT)
+			{
+				status |= charon->kernel_interface->add_policy(charon->kernel_interface,
+					this->other_addr, this->my_addr, other_ts, my_ts, POLICY_FWD,
+					this->my_spi, this->protocol, this->reqid, this->mode,
+					this->ipcomp, this->my_cpi, routed);
+			}
+
+			if (status != SUCCESS)
+			{
+				break;
+			}
+		}
+		enumerator->destroy(enumerator);
+	}
+
+	if (status == SUCCESS && this->state == CHILD_CREATED)
+	{	/* switch to routed state if no SAD entry set up */
+		set_state(this, CHILD_ROUTED);
+	}
+	return status;
+}
+
+/**
+ * Implementation of child_sa_t.update.
+ */
+static status_t update(private_child_sa_t *this,  host_t *me, host_t *other,
+					   host_t *vip, bool encap)
+{
+	child_sa_state_t old;
+	bool transport_proxy_mode;
+
+	/* anything changed at all? */
+	if (me->equals(me, this->my_addr) &&
+		other->equals(other, this->other_addr) && this->encap == encap)
+	{
+		return SUCCESS;
+	}
+
+	old = this->state;
+	set_state(this, CHILD_UPDATING);
+	transport_proxy_mode = this->config->use_proxy_mode(this->config) &&
+						   this->mode == MODE_TRANSPORT;
+
+	if (!transport_proxy_mode)
+	{
+		/* update our (initator) SA */
+		if (this->my_spi)
+		{
+			if (charon->kernel_interface->update_sa(charon->kernel_interface,
+							this->my_spi, this->protocol,
+							this->ipcomp != IPCOMP_NONE ? this->my_cpi : 0,
+							this->other_addr, this->my_addr, other, me,
+							this->encap, encap) == NOT_SUPPORTED)
+			{
+				return NOT_SUPPORTED;
+			}
+		}
+
+		/* update his (responder) SA */
+		if (this->other_spi)
+		{
+			if (charon->kernel_interface->update_sa(charon->kernel_interface,
+							this->other_spi, this->protocol,
+							this->ipcomp != IPCOMP_NONE ? this->other_cpi : 0,
+							this->my_addr, this->other_addr, me, other,
+							this->encap, encap) == NOT_SUPPORTED)
+			{
+				return NOT_SUPPORTED;
+			}
+		}
+	}
+
+	if (this->config->install_policy(this->config))
+	{
+		/* update policies */
+		if (!me->ip_equals(me, this->my_addr) ||
+			!other->ip_equals(other, this->other_addr))
+		{
+			enumerator_t *enumerator;
+			traffic_selector_t *my_ts, *other_ts;
+
+			/* always use high priorities, as hosts getting updated are INSTALLED */
+			enumerator = create_policy_enumerator(this);
+			while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
+			{
+				/* remove old policies first */
+				charon->kernel_interface->del_policy(charon->kernel_interface,
+											my_ts, other_ts, POLICY_OUT, FALSE);
+				charon->kernel_interface->del_policy(charon->kernel_interface,
+											other_ts, my_ts,  POLICY_IN, FALSE);
+				if (this->mode != MODE_TRANSPORT)
+				{
+					charon->kernel_interface->del_policy(charon->kernel_interface,
+											other_ts, my_ts, POLICY_FWD, FALSE);
+				}
+
+				/* check whether we have to update a "dynamic" traffic selector */
+				if (!me->ip_equals(me, this->my_addr) &&
+					my_ts->is_host(my_ts, this->my_addr))
+				{
+					my_ts->set_address(my_ts, me);
+				}
+				if (!other->ip_equals(other, this->other_addr) &&
+					other_ts->is_host(other_ts, this->other_addr))
+				{
+					other_ts->set_address(other_ts, other);
+				}
+
+				/* we reinstall the virtual IP to handle interface roaming
+				 * correctly */
+				if (vip)
+				{
+					charon->kernel_interface->del_ip(charon->kernel_interface, vip);
+					charon->kernel_interface->add_ip(charon->kernel_interface, vip, me);
+				}
+
+				/* reinstall updated policies */
+				charon->kernel_interface->add_policy(charon->kernel_interface,
+						me, other, my_ts, other_ts, POLICY_OUT, this->other_spi,
+						this->protocol, this->reqid, this->mode, this->ipcomp,
+						this->other_cpi, FALSE);
+				charon->kernel_interface->add_policy(charon->kernel_interface,
+						other, me, other_ts, my_ts, POLICY_IN, this->my_spi,
+						this->protocol, this->reqid, this->mode, this->ipcomp,
+						this->my_cpi, FALSE);
+				if (this->mode != MODE_TRANSPORT)
+				{
+					charon->kernel_interface->add_policy(charon->kernel_interface,
+						other, me, other_ts, my_ts, POLICY_FWD, this->my_spi,
+						this->protocol, this->reqid, this->mode, this->ipcomp,
+						this->my_cpi, FALSE);
+				}
+			}
+			enumerator->destroy(enumerator);
+		}
+	}
+
+	if (!transport_proxy_mode)
+	{
+		/* apply hosts */
+		if (!me->equals(me, this->my_addr))
+		{
+			this->my_addr->destroy(this->my_addr);
+			this->my_addr = me->clone(me);
+		}
+		if (!other->equals(other, this->other_addr))
+		{
+			this->other_addr->destroy(this->other_addr);
+			this->other_addr = other->clone(other);
+		}
+	}
+
+	this->encap = encap;
+	set_state(this, old);
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of child_sa_t.destroy.
+ */
+static void destroy(private_child_sa_t *this)
+{
+	enumerator_t *enumerator;
+	traffic_selector_t *my_ts, *other_ts;
+	bool unrouted = (this->state == CHILD_ROUTED);
+
+	set_state(this, CHILD_DESTROYING);
+
+	/* delete SAs in the kernel, if they are set up */
+	if (this->my_spi)
+	{
+		/* if CHILD was not established, use PROTO_ESP used during alloc_spi().
+		 * TODO: For AH support, we have to store protocol specific SPI.s */
+		if (this->protocol == PROTO_NONE)
+		{
+			this->protocol = PROTO_ESP;
+		}
+		charon->kernel_interface->del_sa(charon->kernel_interface,
+					this->other_addr, this->my_addr, this->my_spi,
+					this->protocol, this->my_cpi);
+	}
+	if (this->other_spi)
+	{
+		charon->kernel_interface->del_sa(charon->kernel_interface,
+					this->my_addr, this->other_addr, this->other_spi,
+					this->protocol, this->other_cpi);
+	}
+
+	if (this->config->install_policy(this->config))
+	{
+		/* delete all policies in the kernel */
+		enumerator = create_policy_enumerator(this);
+		while (enumerator->enumerate(enumerator, &my_ts, &other_ts))
+		{
+			charon->kernel_interface->del_policy(charon->kernel_interface,
+										my_ts, other_ts, POLICY_OUT, unrouted);
+			charon->kernel_interface->del_policy(charon->kernel_interface,
+										other_ts, my_ts, POLICY_IN, unrouted);
+			if (this->mode != MODE_TRANSPORT)
+			{
+				charon->kernel_interface->del_policy(charon->kernel_interface,
+										other_ts, my_ts, POLICY_FWD, unrouted);
+			}
+		}
+		enumerator->destroy(enumerator);
+	}
+
+	this->my_ts->destroy_offset(this->my_ts, offsetof(traffic_selector_t, destroy));
+	this->other_ts->destroy_offset(this->other_ts, offsetof(traffic_selector_t, destroy));
+	this->my_addr->destroy(this->my_addr);
+	this->other_addr->destroy(this->other_addr);
+	DESTROY_IF(this->proposal);
+	this->config->destroy(this->config);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+child_sa_t * child_sa_create(host_t *me, host_t* other,
+							 child_cfg_t *config, u_int32_t rekey, bool encap)
+{
+	static u_int32_t reqid = 0;
+	private_child_sa_t *this = malloc_thing(private_child_sa_t);
+
+	/* public functions */
+	this->public.get_name = (char*(*)(child_sa_t*))get_name;
+	this->public.get_reqid = (u_int32_t(*)(child_sa_t*))get_reqid;
+	this->public.get_config = (child_cfg_t*(*)(child_sa_t*))get_config;
+	this->public.get_state = (child_sa_state_t(*)(child_sa_t*))get_state;
+	this->public.set_state = (void(*)(child_sa_t*,child_sa_state_t))set_state;
+	this->public.get_spi = (u_int32_t(*)(child_sa_t*, bool))get_spi;
+	this->public.get_cpi = (u_int16_t(*)(child_sa_t*, bool))get_cpi;
+	this->public.get_protocol = (protocol_id_t(*)(child_sa_t*))get_protocol;
+	this->public.set_protocol = (void(*)(child_sa_t*, protocol_id_t protocol))set_protocol;
+	this->public.get_mode = (ipsec_mode_t(*)(child_sa_t*))get_mode;
+	this->public.set_mode = (void(*)(child_sa_t*, ipsec_mode_t mode))set_mode;
+	this->public.get_proposal = (proposal_t*(*)(child_sa_t*))get_proposal;
+	this->public.set_proposal = (void(*)(child_sa_t*, proposal_t *proposal))set_proposal;
+	this->public.get_lifetime = (time_t(*)(child_sa_t*, bool))get_lifetime;
+	this->public.get_usestats = (void(*)(child_sa_t*,bool,time_t*,u_int64_t*))get_usestats;
+	this->public.has_encap = (bool(*)(child_sa_t*))has_encap;
+	this->public.get_ipcomp = (ipcomp_transform_t(*)(child_sa_t*))get_ipcomp;
+	this->public.set_ipcomp = (void(*)(child_sa_t*,ipcomp_transform_t))set_ipcomp;
+	this->public.alloc_spi = (u_int32_t(*)(child_sa_t*, protocol_id_t protocol))alloc_spi;
+	this->public.alloc_cpi = (u_int16_t(*)(child_sa_t*))alloc_cpi;
+	this->public.install = (status_t(*)(child_sa_t*, chunk_t encr, chunk_t integ, u_int32_t spi, u_int16_t cpi, bool inbound, linked_list_t *my_ts_list, linked_list_t *other_ts_list))install;
+	this->public.update = (status_t (*)(child_sa_t*,host_t*,host_t*,host_t*,bool))update;
+	this->public.add_policies = (status_t (*)(child_sa_t*, linked_list_t*,linked_list_t*))add_policies;
+	this->public.get_traffic_selectors = (linked_list_t*(*)(child_sa_t*,bool))get_traffic_selectors;
+	this->public.create_policy_enumerator = (enumerator_t*(*)(child_sa_t*))create_policy_enumerator;
+	this->public.destroy = (void(*)(child_sa_t*))destroy;
+
+	/* private data */
+	this->my_addr = me->clone(me);
+	this->other_addr = other->clone(other);
+	this->my_spi = 0;
+	this->other_spi = 0;
+	this->my_cpi = 0;
+	this->other_cpi = 0;
+	this->encap = encap;
+	this->ipcomp = IPCOMP_NONE;
+	this->state = CHILD_CREATED;
+	this->my_usetime = 0;
+	this->other_usetime = 0;
+	this->my_usebytes = 0;
+	this->other_usebytes = 0;
+	/* reuse old reqid if we are rekeying an existing CHILD_SA */
+	this->reqid = rekey ? rekey : ++reqid;
+	this->my_ts = linked_list_create();
+	this->other_ts = linked_list_create();
+	this->protocol = PROTO_NONE;
+	this->mode = MODE_TUNNEL;
+	this->proposal = NULL;
+	this->rekey_time = 0;
+	this->expire_time = 0;
+	this->config = config;
+	config->get_ref(config);
+
+	/* MIPv6 proxy transport mode sets SA endpoints to TS hosts */
+	if (config->get_mode(config) == MODE_TRANSPORT &&
+		config->use_proxy_mode(config))
+	{
+		ts_type_t type;
+		int family;
+		chunk_t addr;
+		host_t *host;
+		enumerator_t *enumerator;
+		linked_list_t *my_ts_list, *other_ts_list;
+		traffic_selector_t *my_ts, *other_ts;
+
+		this->mode = MODE_TRANSPORT;
+
+		my_ts_list = config->get_traffic_selectors(config, TRUE, NULL, me);
+		enumerator = my_ts_list->create_enumerator(my_ts_list);
+		if (enumerator->enumerate(enumerator, &my_ts))
+		{
+			if (my_ts->is_host(my_ts, NULL) &&
+			   !my_ts->is_host(my_ts, this->my_addr))
+			{
+				type = my_ts->get_type(my_ts);
+				family = (type == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
+				addr = my_ts->get_from_address(my_ts);
+				host = host_create_from_chunk(family, addr, 0);
+				free(addr.ptr);
+				DBG1(DBG_CHD, "my address: %H is a transport mode proxy for %H",
+							   this->my_addr, host);
+				this->my_addr->destroy(this->my_addr);
+				this->my_addr = host;
+			}
+		}
+		enumerator->destroy(enumerator);
+		my_ts_list->destroy_offset(my_ts_list, offsetof(traffic_selector_t, destroy));
+
+		other_ts_list = config->get_traffic_selectors(config, FALSE, NULL, other);
+		enumerator = other_ts_list->create_enumerator(other_ts_list);
+		if (enumerator->enumerate(enumerator, &other_ts))
+		{
+			if (other_ts->is_host(other_ts, NULL) &&
+			   !other_ts->is_host(other_ts, this->other_addr))
+			{
+				type = other_ts->get_type(other_ts);
+				family = (type == TS_IPV4_ADDR_RANGE) ? AF_INET : AF_INET6;
+				addr = other_ts->get_from_address(other_ts);
+				host = host_create_from_chunk(family, addr, 0);
+				free(addr.ptr);
+				DBG1(DBG_CHD, "other address: %H is a transport mode proxy for %H",
+							   this->other_addr, host);
+				this->other_addr->destroy(this->other_addr);
+				this->other_addr = host;
+			}
+		}
+		enumerator->destroy(enumerator);
+		other_ts_list->destroy_offset(other_ts_list, offsetof(traffic_selector_t, destroy));
+	}
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/child_sa.h b/src/libcharon/sa/child_sa.h
new file mode 100644
index 000000000..e6c603504
--- /dev/null
+++ b/src/libcharon/sa/child_sa.h
@@ -0,0 +1,337 @@
+/*
+ * Copyright (C) 2006-2008 Tobias Brunner
+ * Copyright (C) 2006-2008 Martin Willi
+ * Copyright (C) 2006 Daniel Roethlisberger
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup child_sa child_sa
+ * @{ @ingroup sa
+ */
+
+#ifndef CHILD_SA_H_
+#define CHILD_SA_H_
+
+typedef enum child_sa_state_t child_sa_state_t;
+typedef struct child_sa_t child_sa_t;
+
+#include <library.h>
+#include <crypto/prf_plus.h>
+#include <encoding/payloads/proposal_substructure.h>
+#include <config/proposal.h>
+#include <config/child_cfg.h>
+
+/**
+ * States of a CHILD_SA
+ */
+enum child_sa_state_t {
+
+	/**
+	 * Just created, uninstalled CHILD_SA
+	 */
+	CHILD_CREATED,
+
+	/**
+	 * Installed SPD, but no SAD entries
+	 */
+	CHILD_ROUTED,
+
+	/**
+	 * Installing an in-use CHILD_SA
+	 */
+	CHILD_INSTALLING,
+
+	/**
+	 * Installed an in-use CHILD_SA
+	 */
+	CHILD_INSTALLED,
+
+	/**
+	 * While updating hosts, in update_hosts()
+	 */
+	CHILD_UPDATING,
+
+	/**
+	 * CHILD_SA which is rekeying
+	 */
+	CHILD_REKEYING,
+
+	/**
+	 * CHILD_SA in progress of delete
+	 */
+	CHILD_DELETING,
+
+	/**
+	 * CHILD_SA object gets destroyed
+	 */
+	CHILD_DESTROYING,
+};
+
+/**
+ * enum strings for child_sa_state_t.
+ */
+extern enum_name_t *child_sa_state_names;
+
+/**
+ * Represents an IPsec SAs between two hosts.
+ *
+ * A child_sa_t contains two SAs. SAs for both
+ * directions are managed in one child_sa_t object. Both
+ * SAs and the policies have the same reqid.
+ *
+ * The procedure for child sa setup is as follows:
+ * - A gets SPIs for a all protocols in its proposals via child_sa_t.alloc
+ * - A send the proposals with the allocated SPIs to B
+ * - B selects a suitable proposal
+ * - B allocates an SPI for the selected protocol
+ * - B calls child_sa_t.install for both, the allocated and received SPI
+ * - B sends the proposal with the allocated SPI to A
+ * - A calls child_sa_t.install for both, the allocated and recevied SPI
+ *
+ * Once SAs are set up, policies can be added using add_policies.
+ */
+struct child_sa_t {
+
+	/**
+	 * Get the name of the config this CHILD_SA uses.
+	 *
+	 * @return			name
+	 */
+	char* (*get_name) (child_sa_t *this);
+
+	/**
+	 * Get the reqid of the CHILD SA.
+	 *
+	 * Every CHILD_SA has a reqid. The kernel uses this ID to
+	 * identify it.
+	 *
+	 * @return 			reqid of the CHILD SA
+	 */
+	u_int32_t (*get_reqid)(child_sa_t *this);
+
+	/**
+	 * Get the config used to set up this child sa.
+	 *
+	 * @return			child_cfg
+	 */
+	child_cfg_t* (*get_config) (child_sa_t *this);
+
+	/**
+	 * Get the state of the CHILD_SA.
+	 *
+	 * @return 			CHILD_SA state
+	 */
+	child_sa_state_t (*get_state) (child_sa_t *this);
+
+	/**
+	 * Set the state of the CHILD_SA.
+	 *
+	 * @param state		state to set on CHILD_SA
+	 */
+	void (*set_state) (child_sa_t *this, child_sa_state_t state);
+
+	/**
+	 * Get the SPI of this CHILD_SA.
+	 *
+	 * Set the boolean parameter inbound to TRUE to
+	 * get the SPI for which we receive packets, use
+	 * FALSE to get those we use for sending packets.
+	 *
+	 * @param inbound	TRUE to get inbound SPI, FALSE for outbound.
+	 * @return 			SPI of the CHILD SA
+	 */
+	u_int32_t (*get_spi) (child_sa_t *this, bool inbound);
+
+	/**
+	 * Get the CPI of this CHILD_SA.
+	 *
+	 * Set the boolean parameter inbound to TRUE to
+	 * get the CPI for which we receive packets, use
+	 * FALSE to get those we use for sending packets.
+	 *
+	 * @param inbound	TRUE to get inbound CPI, FALSE for outbound.
+	 * @return 			CPI of the CHILD SA
+	 */
+	u_int16_t (*get_cpi) (child_sa_t *this, bool inbound);
+
+	/**
+	 * Get the protocol which this CHILD_SA uses to protect traffic.
+	 *
+	 * @return 			AH | ESP
+	 */
+	protocol_id_t (*get_protocol) (child_sa_t *this);
+
+	/**
+	 * Set the negotiated protocol to use for this CHILD_SA.
+	 *
+	 * @param protocol	AH | ESP
+	 */
+	void (*set_protocol)(child_sa_t *this, protocol_id_t protocol);
+
+	/**
+	 * Get the IPsec mode of this CHILD_SA.
+	 *
+	 * @return			TUNNEL | TRANSPORT | BEET
+	 */
+	ipsec_mode_t (*get_mode)(child_sa_t *this);
+
+	/**
+	 * Set the negotiated IPsec mode to use.
+	 *
+	 * @param mode		TUNNEL | TRANPORT | BEET
+	 */
+	void (*set_mode)(child_sa_t *this, ipsec_mode_t mode);
+
+	/**
+	 * Get the used IPComp algorithm.
+	 *
+	 * @return			IPComp compression algorithm.
+	 */
+	ipcomp_transform_t (*get_ipcomp)(child_sa_t *this);
+
+	/**
+	 * Set the IPComp algorithm to use.
+	 *
+	 * @param ipcomp	the IPComp transform to use
+	 */
+	void (*set_ipcomp)(child_sa_t *this, ipcomp_transform_t ipcomp);
+
+	/**
+	 * Get the selected proposal.
+	 *
+	 * @return			selected proposal
+	 */
+	proposal_t* (*get_proposal)(child_sa_t *this);
+
+	/**
+	 * Set the negotiated proposal.
+	 *
+	 * @param proposal	selected proposal
+	 */
+	void (*set_proposal)(child_sa_t *this, proposal_t *proposal);
+
+	/**
+	 * Check if this CHILD_SA uses UDP encapsulation.
+	 *
+	 * @return			TRUE if SA encapsulates ESP packets
+	 */
+	bool (*has_encap)(child_sa_t *this);
+
+	/**
+	 * Get the absolute time when the CHILD_SA expires or gets rekeyed.
+	 *
+	 * @param hard		TRUE for hard lifetime, FALSE for soft (rekey) lifetime
+	 * @return			absolute time
+	 */
+	time_t (*get_lifetime)(child_sa_t *this, bool hard);
+
+	/**
+	 * Get last use time and the number of bytes processed.
+	 *
+	 * @param inbound		TRUE for inbound traffic, FALSE for outbound
+	 * @param[out] time		time of last use in seconds (NULL to ignore)
+	 * @param[out] bytes	number of processed bytes (NULL to ignore)
+	 */
+	void (*get_usestats)(child_sa_t *this, bool inbound, time_t *time,
+						 u_int64_t *bytes);
+
+	/**
+	 * Get the traffic selectors list added for one side.
+	 *
+	 * @param local		TRUE for own traffic selectors, FALSE for remote
+	 * @return			list of traffic selectors
+	 */
+	linked_list_t* (*get_traffic_selectors) (child_sa_t *this, bool local);
+
+	/**
+	 * Create an enumerator over installed policies.
+	 *
+	 * @return			enumerator over pairs of traffic selectors.
+	 */
+	enumerator_t* (*create_policy_enumerator)(child_sa_t *this);
+
+	/**
+	 * Allocate an SPI to include in a proposal.
+	 *
+	 * @param protocol	protocol to allocate SPI for (ESP|AH)
+	 * @param spi		SPI output pointer
+	 * @return			SPI, 0 on failure
+	 */
+	u_int32_t (*alloc_spi)(child_sa_t *this, protocol_id_t protocol);
+
+	/**
+	 * Allocate a CPI to use for IPComp.
+	 *
+	 * @return			CPI, 0 on failure
+	 */
+	u_int16_t (*alloc_cpi)(child_sa_t *this);
+
+	/**
+	 * Install an IPsec SA for one direction.
+	 *
+	 * @param encr		encryption key, if any
+	 * @param integ		integrity key
+	 * @param spi		SPI to use, allocated for inbound
+	 * @param cpi		CPI to use, allocated for outbound
+	 * @param inbound	TRUE to install an inbound SA, FALSE for outbound
+	 * @param my_ts		negotiated local traffic selector list
+	 * @param other_ts	negotiated remote traffic selector list
+	 * @return			SUCCESS or FAILED
+	 */
+	status_t (*install)(child_sa_t *this, chunk_t encr, chunk_t integ,
+						u_int32_t spi, u_int16_t cpi, bool inbound,
+						linked_list_t *my_ts, linked_list_t *other_ts);
+	/**
+	 * Install the policies using some traffic selectors.
+	 *
+	 * Supplied lists of traffic_selector_t's specify the policies
+	 * to use for this child sa.
+	 *
+	 * @param my_ts		traffic selectors for local site
+	 * @param other_ts	traffic selectors for remote site
+	 * @return			SUCCESS or FAILED
+	 */
+	status_t (*add_policies)(child_sa_t *this, linked_list_t *my_ts_list,
+							 linked_list_t *other_ts_list);
+	/**
+	 * Update hosts and ecapulation mode in the kernel SAs and policies.
+	 *
+	 * @param me		the new local host
+	 * @param other		the new remote host
+	 * @param vip		virtual IP, if any
+	 * @param			TRUE to use UDP encapsulation for NAT traversal
+	 * @return			SUCCESS or FAILED
+	 */
+	status_t (*update)(child_sa_t *this, host_t *me, host_t *other,
+					   host_t *vip, bool encap);
+	/**
+	 * Destroys a child_sa.
+	 */
+	void (*destroy) (child_sa_t *this);
+};
+
+/**
+ * Constructor to create a child SA negotiated with IKE.
+ *
+ * @param me				own address
+ * @param other				remote address
+ * @param config			config to use for this CHILD_SA
+ * @param reqid				reqid of old CHILD_SA when rekeying, 0 otherwise
+ * @param encap				TRUE to enable UDP encapsulation (NAT traversal)
+ * @return					child_sa_t object
+ */
+child_sa_t * child_sa_create(host_t *me, host_t *other, child_cfg_t *config,
+							 u_int32_t reqid, bool encap);
+
+#endif /** CHILD_SA_H_ @}*/
diff --git a/src/libcharon/sa/connect_manager.c b/src/libcharon/sa/connect_manager.c
new file mode 100644
index 000000000..b78ba070d
--- /dev/null
+++ b/src/libcharon/sa/connect_manager.c
@@ -0,0 +1,1623 @@
+/*
+ * Copyright (C) 2007-2008 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "connect_manager.h"
+
+#include <math.h>
+
+#include <daemon.h>
+#include <threading/mutex.h>
+#include <utils/linked_list.h>
+#include <crypto/hashers/hasher.h>
+
+#include <processing/jobs/callback_job.h>
+#include <processing/jobs/initiate_mediation_job.h>
+#include <encoding/payloads/endpoint_notify.h>
+
+/* base timeout
+ * the check interval is ME_INTERVAL */
+#define ME_INTERVAL 25 /* ms */
+/* retransmission timeout is first ME_INTERVAL for ME_BOOST retransmissions
+ * then gets reduced to ME_INTERVAL * ME_RETRANS_BASE ^ (sent retransmissions - ME_BOOST). */
+/* number of initial retransmissions sent in short interval */
+#define ME_BOOST 2
+/* base for retransmissions */
+#define ME_RETRANS_BASE 1.8
+/* max number of retransmissions */
+#define ME_MAX_RETRANS 13
+
+/* time to wait before the initiator finishes the connectivity checks after
+ * the first check has succeeded */
+#define ME_WAIT_TO_FINISH 1000 /* ms */
+
+typedef struct private_connect_manager_t private_connect_manager_t;
+
+/**
+ * Additional private members of connect_manager_t.
+ */
+struct private_connect_manager_t {
+	/**
+	 * Public interface of connect_manager_t.
+	 */
+	 connect_manager_t public;
+
+	 /**
+	  * Lock for exclusivly accessing the manager.
+	  */
+	 mutex_t *mutex;
+
+	 /**
+	  * Hasher to generate signatures
+	  */
+	 hasher_t *hasher;
+
+	 /**
+	  * Linked list with initiated mediated connections
+	  */
+	 linked_list_t *initiated;
+
+	 /**
+	  * Linked list with checklists (hash table with connect ID as key would
+	  * be better).
+	  */
+	 linked_list_t *checklists;
+};
+
+typedef enum check_state_t check_state_t;
+
+enum check_state_t {
+	CHECK_NONE,
+	CHECK_WAITING,
+	CHECK_IN_PROGRESS,
+	CHECK_SUCCEEDED,
+	CHECK_FAILED
+};
+
+typedef struct endpoint_pair_t endpoint_pair_t;
+
+/**
+ * An entry in the check list.
+ */
+struct endpoint_pair_t {
+	/** pair id */
+	u_int32_t id;
+
+	/** priority */
+	u_int64_t priority;
+
+	/** local endpoint */
+	host_t *local;
+
+	/** remote endpoint */
+	host_t *remote;
+
+	/** state */
+	check_state_t state;
+
+	/** number of retransmissions */
+	u_int32_t retransmitted;
+
+	/** the generated packet */
+	packet_t *packet;
+};
+
+/**
+ * Destroys an endpoint pair
+ */
+static void endpoint_pair_destroy(endpoint_pair_t *this)
+{
+	DESTROY_IF(this->local);
+	DESTROY_IF(this->remote);
+	DESTROY_IF(this->packet);
+	free(this);
+}
+
+/**
+ * Creates a new entry for the list.
+ */
+static endpoint_pair_t *endpoint_pair_create(endpoint_notify_t *initiator,
+		endpoint_notify_t *responder, bool initiator_is_local)
+{
+	endpoint_pair_t *this = malloc_thing(endpoint_pair_t);
+
+	this->id = 0;
+
+	u_int32_t pi = initiator->get_priority(initiator);
+	u_int32_t pr = responder->get_priority(responder);
+	this->priority = pow(2, 32) * min(pi, pr) + 2 * max(pi, pr) + (pi > pr ? 1 : 0);
+
+	this->local = initiator_is_local ? initiator->get_base(initiator)
+									 : responder->get_base(responder);
+	this->local = this->local->clone(this->local);
+	this->remote = initiator_is_local ? responder->get_host(responder)
+									  : initiator->get_host(initiator);
+	this->remote = this->remote->clone(this->remote);
+
+	this->state = CHECK_WAITING;
+	this->retransmitted = 0;
+	this->packet = NULL;
+
+	return this;
+}
+
+
+typedef struct check_list_t check_list_t;
+
+/**
+ * An entry in the linked list.
+ */
+struct check_list_t {
+
+	struct {
+		/** initiator's id */
+		identification_t *id;
+
+		/** initiator's key */
+		chunk_t key;
+
+		/** initiator's endpoints */
+		linked_list_t *endpoints;
+	} initiator;
+
+	struct {
+		/** responder's id */
+		identification_t *id;
+
+		/** responder's key */
+		chunk_t key;
+
+		/** responder's endpoints */
+		linked_list_t *endpoints;
+	} responder;
+
+	/** connect id */
+	chunk_t connect_id;
+
+	/** list of endpoint pairs */
+	linked_list_t *pairs;
+
+	/** pairs queued for triggered checks */
+	linked_list_t *triggered;
+
+	/** state */
+	check_state_t state;
+
+	/** TRUE if this is the initiator */
+	bool is_initiator;
+
+	/** TRUE if the initiator is finishing the checks */
+	bool is_finishing;
+
+	/** the current sender job */
+	job_t *sender;
+
+};
+
+/**
+ * Destroys a checklist
+ */
+static void check_list_destroy(check_list_t *this)
+{
+	DESTROY_IF(this->initiator.id);
+	DESTROY_IF(this->responder.id);
+
+	chunk_free(&this->connect_id);
+	chunk_free(&this->initiator.key);
+	chunk_free(&this->responder.key);
+
+	DESTROY_OFFSET_IF(this->initiator.endpoints,
+					  offsetof(endpoint_notify_t, destroy));
+	DESTROY_OFFSET_IF(this->responder.endpoints,
+					  offsetof(endpoint_notify_t, destroy));
+
+	DESTROY_FUNCTION_IF(this->pairs, (void*)endpoint_pair_destroy);
+	/* this list contains some of the elements contained in this->pairs */
+	DESTROY_IF(this->triggered);
+
+	free(this);
+}
+
+/**
+ * Creates a new checklist
+ */
+static check_list_t *check_list_create(identification_t *initiator,
+									   identification_t *responder,
+									   chunk_t connect_id,
+									   chunk_t initiator_key,
+									   linked_list_t *initiator_endpoints,
+									   bool is_initiator)
+{
+	check_list_t *this = malloc_thing(check_list_t);
+
+	this->connect_id = chunk_clone(connect_id);
+
+	this->initiator.id = initiator->clone(initiator);
+	this->initiator.key = chunk_clone(initiator_key);
+	this->initiator.endpoints = initiator_endpoints->clone_offset(initiator_endpoints, offsetof(endpoint_notify_t, clone));
+
+	this->responder.id = responder->clone(responder);
+	this->responder.key = chunk_empty;
+	this->responder.endpoints = NULL;
+
+	this->pairs = linked_list_create();
+	this->triggered = linked_list_create();
+	this->state = CHECK_NONE;
+	this->is_initiator = is_initiator;
+	this->is_finishing = FALSE;
+
+	return this;
+}
+
+typedef struct initiated_t initiated_t;
+
+/**
+ * For an initiator, the data stored about initiated mediation connections
+ */
+struct initiated_t {
+	/** my id */
+	identification_t *id;
+
+	/** peer id */
+	identification_t *peer_id;
+
+	/** list of mediated sas */
+	linked_list_t *mediated;
+};
+
+/**
+ * Destroys a queued initiation
+ */
+static void initiated_destroy(initiated_t *this)
+{
+	DESTROY_IF(this->id);
+	DESTROY_IF(this->peer_id);
+	this->mediated->destroy_offset(this->mediated,
+								   offsetof(ike_sa_id_t, destroy));
+	free(this);
+}
+
+/**
+ * Creates a queued initiation
+ */
+static initiated_t *initiated_create(identification_t *id,
+									 identification_t *peer_id)
+{
+	initiated_t *this = malloc_thing(initiated_t);
+
+	this->id = id->clone(id);
+	this->peer_id = peer_id->clone(peer_id);
+	this->mediated = linked_list_create();
+
+	return this;
+}
+
+
+typedef struct check_t check_t;
+
+/**
+ * Data exchanged in a connectivity check
+ */
+struct check_t {
+	/** message id */
+	u_int32_t mid;
+
+	/** source of the connectivity check */
+	host_t *src;
+
+	/** destination of the connectivity check */
+	host_t *dst;
+
+	/** connect id */
+	chunk_t connect_id;
+
+	/** endpoint */
+	endpoint_notify_t *endpoint;
+
+	/** raw endpoint payload (to verify the signature) */
+	chunk_t endpoint_raw;
+
+	/** connect auth */
+	chunk_t auth;
+};
+
+/**
+ * Destroys a connectivity check
+ */
+static void check_destroy(check_t *this)
+{
+	chunk_free(&this->connect_id);
+	chunk_free(&this->endpoint_raw);
+	chunk_free(&this->auth);
+	DESTROY_IF(this->src);
+	DESTROY_IF(this->dst);
+	DESTROY_IF(this->endpoint);
+	free(this);
+}
+
+/**
+ * Creates a new connectivity check
+ */
+static check_t *check_create()
+{
+	check_t *this = malloc_thing(check_t);
+
+	this->connect_id = chunk_empty;
+	this->auth = chunk_empty;
+	this->endpoint_raw = chunk_empty;
+	this->src = NULL;
+	this->dst = NULL;
+	this->endpoint = NULL;
+
+	this->mid = 0;
+
+	return this;
+}
+
+typedef struct callback_data_t callback_data_t;
+
+/**
+ * Data required by several callback jobs used in this file
+ */
+struct callback_data_t {
+	/** connect manager */
+	private_connect_manager_t *connect_manager;
+
+	/** connect id */
+	chunk_t connect_id;
+
+	/** message (pair) id */
+	u_int32_t mid;
+};
+
+/**
+ * Destroys a callback data object
+ */
+static void callback_data_destroy(callback_data_t *this)
+{
+	chunk_free(&this->connect_id);
+	free(this);
+}
+
+/**
+ * Creates a new callback data object
+ */
+static callback_data_t *callback_data_create(private_connect_manager_t *connect_manager,
+											 chunk_t connect_id)
+{
+	callback_data_t *this = malloc_thing(callback_data_t);
+	this->connect_manager = connect_manager;
+	this->connect_id = chunk_clone(connect_id);
+	this->mid = 0;
+	return this;
+}
+
+/**
+ * Creates a new retransmission data object
+ */
+static callback_data_t *retransmit_data_create(private_connect_manager_t *connect_manager,
+											   chunk_t connect_id, u_int32_t mid)
+{
+	callback_data_t *this = callback_data_create(connect_manager, connect_id);
+	this->mid = mid;
+	return this;
+}
+
+typedef struct initiate_data_t initiate_data_t;
+
+/**
+ * Data required by the initiate mediated
+ */
+struct initiate_data_t {
+	/** checklist */
+	check_list_t *checklist;
+
+	/** waiting mediated connections */
+	initiated_t *initiated;
+};
+
+/**
+ * Destroys a initiate data object
+ */
+static void initiate_data_destroy(initiate_data_t *this)
+{
+	check_list_destroy(this->checklist);
+	initiated_destroy(this->initiated);
+	free(this);
+}
+
+/**
+ * Creates a new initiate data object
+ */
+static initiate_data_t *initiate_data_create(check_list_t *checklist,
+											 initiated_t *initiated)
+{
+	initiate_data_t *this = malloc_thing(initiate_data_t);
+
+	this->checklist = checklist;
+	this->initiated = initiated;
+
+	return this;
+}
+
+/**
+ * Find an initiated connection by the peers' ids
+ */
+static bool match_initiated_by_ids(initiated_t *current, identification_t *id,
+								   identification_t *peer_id)
+{
+	return id->equals(id, current->id) && peer_id->equals(peer_id, current->peer_id);
+}
+
+static status_t get_initiated_by_ids(private_connect_manager_t *this,
+									 identification_t *id,
+									 identification_t *peer_id,
+									 initiated_t **initiated)
+{
+	return this->initiated->find_first(this->initiated,
+								(linked_list_match_t)match_initiated_by_ids,
+								(void**)initiated, id, peer_id);
+}
+
+/**
+ * Removes data about initiated connections
+ */
+static void remove_initiated(private_connect_manager_t *this,
+							 initiated_t *initiated)
+{
+	iterator_t *iterator;
+	initiated_t *current;
+
+	iterator = this->initiated->create_iterator(this->initiated, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (current == initiated)
+		{
+			iterator->remove(iterator);
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Find the checklist with a specific connect ID
+ */
+static bool match_checklist_by_id(check_list_t *current, chunk_t *connect_id)
+{
+	return chunk_equals(*connect_id, current->connect_id);
+}
+
+static status_t get_checklist_by_id(private_connect_manager_t *this,
+									chunk_t connect_id,
+									check_list_t **check_list)
+{
+	return this->checklists->find_first(this->checklists,
+								(linked_list_match_t)match_checklist_by_id,
+								(void**)check_list, &connect_id);
+}
+
+/**
+ * Removes a checklist
+ */
+static void remove_checklist(private_connect_manager_t *this,
+							 check_list_t *checklist)
+{
+	iterator_t *iterator;
+	check_list_t *current;
+
+	iterator = this->checklists->create_iterator(this->checklists, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (current == checklist)
+		{
+			iterator->remove(iterator);
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Checks if a list of endpoint_notify_t contains a certain host_t
+ */
+static bool match_endpoint_by_host(endpoint_notify_t *current, host_t *host)
+{
+	return host->equals(host, current->get_host(current));
+}
+
+static status_t endpoints_contain(linked_list_t *endpoints, host_t *host,
+								  endpoint_notify_t **endpoint)
+{
+	return endpoints->find_first(endpoints,
+								 (linked_list_match_t)match_endpoint_by_host,
+								 (void**)endpoint, host);
+}
+
+/**
+ * Inserts an endpoint pair into a list of pairs ordered by priority (high to low)
+ */
+static void insert_pair_by_priority(linked_list_t *pairs, endpoint_pair_t *pair)
+{
+	iterator_t *iterator;
+	endpoint_pair_t *current;
+	bool inserted = FALSE;
+
+	iterator = pairs->create_iterator(pairs, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (current->priority < pair->priority)
+		{
+			iterator->insert_before(iterator, pair);
+			inserted = TRUE;
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	if (!inserted)
+	{
+		pairs->insert_last(pairs, pair);
+	}
+}
+
+/**
+ * Searches a list of endpoint_pair_t for a pair with specific host_ts
+ */
+static bool match_pair_by_hosts(endpoint_pair_t *current, host_t *local,
+								host_t *remote)
+{
+	return local->equals(local, current->local) && remote->equals(remote, current->remote);
+}
+
+static status_t get_pair_by_hosts(linked_list_t *pairs, host_t *local,
+								  host_t *remote, endpoint_pair_t **pair)
+{
+	return pairs->find_first(pairs, (linked_list_match_t)match_pair_by_hosts,
+							 (void**)pair, local, remote);
+}
+
+static bool match_pair_by_id(endpoint_pair_t *current, u_int32_t *id)
+{
+	return current->id == *id;
+}
+
+/**
+ * Searches for a pair with a specific id
+ */
+static status_t get_pair_by_id(check_list_t *checklist, u_int32_t id,
+							   endpoint_pair_t **pair)
+{
+	return checklist->pairs->find_first(checklist->pairs,
+										(linked_list_match_t)match_pair_by_id,
+										(void**)pair, &id);
+}
+
+static bool match_succeeded_pair(endpoint_pair_t *current)
+{
+	return current->state == CHECK_SUCCEEDED;
+}
+
+/**
+ * Returns the best pair of state CHECK_SUCCEEDED from a checklist.
+ */
+static status_t get_best_valid_pair(check_list_t *checklist,
+									endpoint_pair_t **pair)
+{
+	return checklist->pairs->find_first(checklist->pairs,
+									(linked_list_match_t)match_succeeded_pair,
+									(void**)pair);
+}
+
+static bool match_waiting_pair(endpoint_pair_t *current)
+{
+	return current->state == CHECK_WAITING;
+}
+
+/**
+ * Returns and *removes* the first triggered pair in state CHECK_WAITING.
+ */
+static status_t get_triggered_pair(check_list_t *checklist,
+								   endpoint_pair_t **pair)
+{
+	iterator_t *iterator;
+	endpoint_pair_t *current;
+	status_t status = NOT_FOUND;
+
+	iterator = checklist->triggered->create_iterator(checklist->triggered, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		iterator->remove(iterator);
+
+		if (current->state == CHECK_WAITING)
+		{
+			if (pair)
+			{
+				*pair = current;
+			}
+			status = SUCCESS;
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	return status;
+}
+
+/**
+ * Prints all the pairs on a checklist
+ */
+static void print_checklist(check_list_t *checklist)
+{
+	iterator_t *iterator;
+	endpoint_pair_t *current;
+
+	DBG1(DBG_IKE, "pairs on checklist %#B:", &checklist->connect_id);
+	iterator = checklist->pairs->create_iterator(checklist->pairs, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		DBG1(DBG_IKE, " * %#H - %#H (%d)", current->local, current->remote,
+			 current->priority);
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Prunes identical pairs with lower priority from the list
+ * Note: this function also numbers the remaining pairs serially
+ */
+static void prune_pairs(linked_list_t *pairs)
+{
+	iterator_t *iterator, *search;
+	endpoint_pair_t *current, *other;
+	u_int32_t id = 0;
+
+	iterator = pairs->create_iterator(pairs, TRUE);
+	search = pairs->create_iterator(pairs, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		current->id = ++id;
+
+		while (search->iterate(search, (void**)&other))
+		{
+			if (current == other)
+			{
+				continue;
+			}
+
+			if (current->local->equals(current->local, other->local) &&
+				current->remote->equals(current->remote, other->remote))
+			{
+				/* since the list of pairs is sorted by priority in descending
+				 * order, and we iterate the list from the beginning, we are
+				 * sure that the priority of 'other' is lower than that of
+				 * 'current', remove it */
+				DBG1(DBG_IKE, "pruning endpoint pair %#H - %#H with priority %d",
+					 other->local, other->remote, other->priority);
+				search->remove(search);
+				endpoint_pair_destroy(other);
+			}
+		}
+		search->reset(search);
+	}
+	search->destroy(search);
+	iterator->destroy(iterator);
+}
+
+/**
+ * Builds a list of endpoint pairs
+ */
+static void build_pairs(check_list_t *checklist)
+{
+	/* FIXME: limit endpoints and pairs */
+	iterator_t *iterator_i, *iterator_r;
+	endpoint_notify_t *initiator, *responder;
+
+	iterator_i = checklist->initiator.endpoints->create_iterator(
+										checklist->initiator.endpoints, TRUE);
+	while (iterator_i->iterate(iterator_i, (void**)&initiator))
+	{
+		iterator_r = checklist->responder.endpoints->create_iterator(
+										checklist->responder.endpoints, TRUE);
+		while (iterator_r->iterate(iterator_r, (void**)&responder))
+		{
+			if (initiator->get_family(initiator) != responder->get_family(responder))
+			{
+				continue;
+			}
+
+			insert_pair_by_priority(checklist->pairs, endpoint_pair_create(
+							initiator, responder, checklist->is_initiator));
+		}
+		iterator_r->destroy(iterator_r);
+	}
+	iterator_i->destroy(iterator_i);
+
+	print_checklist(checklist);
+
+	prune_pairs(checklist->pairs);
+}
+
+/**
+ * Processes the payloads of a connectivity check and returns the extracted data
+ */
+static status_t process_payloads(message_t *message, check_t *check)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) != NOTIFY)
+		{
+			DBG1(DBG_IKE, "ignoring payload of type '%N' while processing "
+				 "connectivity check", payload_type_names,
+				 payload->get_type(payload));
+			continue;
+		}
+
+		notify_payload_t *notify = (notify_payload_t*)payload;
+
+		switch (notify->get_notify_type(notify))
+		{
+			case ME_ENDPOINT:
+			{
+				if (check->endpoint)
+				{
+					DBG1(DBG_IKE, "connectivity check contains multiple "
+						 "ME_ENDPOINT notifies");
+					break;
+				}
+
+				endpoint_notify_t *endpoint = endpoint_notify_create_from_payload(notify);
+				if (!endpoint)
+				{
+					DBG1(DBG_IKE, "received invalid ME_ENDPOINT notify");
+					break;
+				}
+				check->endpoint = endpoint;
+				check->endpoint_raw = chunk_clone(notify->get_notification_data(notify));
+				DBG2(DBG_IKE, "received ME_ENDPOINT notify");
+				break;
+			}
+			case ME_CONNECTID:
+			{
+				if (check->connect_id.ptr)
+				{
+					DBG1(DBG_IKE, "connectivity check contains multiple "
+						 "ME_CONNECTID notifies");
+					break;
+				}
+				check->connect_id = chunk_clone(notify->get_notification_data(notify));
+				DBG2(DBG_IKE, "received ME_CONNECTID %#B", &check->connect_id);
+				break;
+			}
+			case ME_CONNECTAUTH:
+			{
+				if (check->auth.ptr)
+				{
+					DBG1(DBG_IKE, "connectivity check contains multiple "
+						 "ME_CONNECTAUTH notifies");
+					break;
+				}
+				check->auth = chunk_clone(notify->get_notification_data(notify));
+				DBG2(DBG_IKE, "received ME_CONNECTAUTH %#B", &check->auth);
+				break;
+			}
+			default:
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	if (!check->connect_id.ptr || !check->endpoint || !check->auth.ptr)
+	{
+		DBG1(DBG_IKE, "at least one required payload was missing from the "
+			 "connectivity check");
+		return FAILED;
+	}
+
+	return SUCCESS;
+}
+
+/**
+ * Builds the signature for a connectivity check
+ */
+static chunk_t build_signature(private_connect_manager_t *this,
+		check_list_t *checklist, check_t *check, bool outbound)
+{
+	u_int32_t mid;
+	chunk_t mid_chunk, key_chunk, sig_chunk;
+	chunk_t sig_hash;
+
+	mid = htonl(check->mid);
+	mid_chunk = chunk_from_thing(mid);
+
+	key_chunk = (checklist->is_initiator && outbound) || (!checklist->is_initiator && !outbound)
+					? checklist->initiator.key : checklist->responder.key;
+
+	/* signature = SHA1( MID | ME_CONNECTID | ME_ENDPOINT | ME_CONNECTKEY ) */
+	sig_chunk = chunk_cat("cccc", mid_chunk, check->connect_id,
+						  check->endpoint_raw, key_chunk);
+	this->hasher->allocate_hash(this->hasher, sig_chunk, &sig_hash);
+	DBG3(DBG_IKE, "sig_chunk %#B", &sig_chunk);
+	DBG3(DBG_IKE, "sig_hash %#B", &sig_hash);
+
+	chunk_free(&sig_chunk);
+	return sig_hash;
+}
+
+static void queue_retransmission(private_connect_manager_t *this, check_list_t *checklist, endpoint_pair_t *pair);
+static void schedule_checks(private_connect_manager_t *this, check_list_t *checklist, u_int32_t time);
+static void finish_checks(private_connect_manager_t *this, check_list_t *checklist);
+
+/**
+ * After one of the initiator's pairs has succeeded we finish the checks without
+ * waiting for all the timeouts
+ */
+static job_requeue_t initiator_finish(callback_data_t *data)
+{
+	private_connect_manager_t *this = data->connect_manager;
+
+	this->mutex->lock(this->mutex);
+
+	check_list_t *checklist;
+	if (get_checklist_by_id(this, data->connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found, can't finish "
+			 "connectivity checks", &data->connect_id);
+		this->mutex->unlock(this->mutex);
+		return JOB_REQUEUE_NONE;
+	}
+
+	finish_checks(this, checklist);
+
+	this->mutex->unlock(this->mutex);
+
+	return JOB_REQUEUE_NONE;
+}
+
+/**
+ * Updates the state of the whole checklist
+ */
+static void update_checklist_state(private_connect_manager_t *this,
+								   check_list_t *checklist)
+{
+	iterator_t *iterator;
+	endpoint_pair_t *current;
+	bool in_progress = FALSE, succeeded = FALSE;
+
+	iterator = checklist->pairs->create_iterator(checklist->pairs, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		switch(current->state)
+		{
+			case CHECK_WAITING:
+				/* at least one is still waiting -> checklist remains
+				 * in waiting state */
+				iterator->destroy(iterator);
+				return;
+			case CHECK_IN_PROGRESS:
+				in_progress = TRUE;
+				break;
+			case CHECK_SUCCEEDED:
+				succeeded = TRUE;
+				break;
+			default:
+				break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	if (checklist->is_initiator && succeeded && !checklist->is_finishing)
+	{
+		/* instead of waiting until all checks have finished (i.e. all
+		 * retransmissions have failed) the initiator finishes the checks
+		 * right after the first check has succeeded. to allow a probably
+		 * better pair to succeed, we still wait a certain time */
+		DBG2(DBG_IKE, "fast finishing checks for checklist '%#B'",
+			 &checklist->connect_id);
+
+		callback_data_t *data = callback_data_create(this, checklist->connect_id);
+		job_t *job = (job_t*)callback_job_create((callback_job_cb_t)initiator_finish, data, (callback_job_cleanup_t)callback_data_destroy, NULL);
+		charon->scheduler->schedule_job_ms(charon->scheduler, job, ME_WAIT_TO_FINISH);
+		checklist->is_finishing = TRUE;
+	}
+
+	if (in_progress)
+	{
+		checklist->state = CHECK_IN_PROGRESS;
+	}
+	else if (succeeded)
+	{
+		checklist->state = CHECK_SUCCEEDED;
+	}
+	else
+	{
+		checklist->state = CHECK_FAILED;
+	}
+}
+
+/**
+ * This function is triggered for each sent check after a specific timeout
+ */
+static job_requeue_t retransmit(callback_data_t *data)
+{
+	private_connect_manager_t *this = data->connect_manager;
+
+	this->mutex->lock(this->mutex);
+
+	check_list_t *checklist;
+	if (get_checklist_by_id(this, data->connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found, can't retransmit "
+			 "connectivity check", &data->connect_id);
+		this->mutex->unlock(this->mutex);
+		return JOB_REQUEUE_NONE;
+	}
+
+	endpoint_pair_t *pair;
+	if (get_pair_by_id(checklist, data->mid, &pair) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "pair with id '%d' not found, can't retransmit "
+			 "connectivity check", data->mid);
+		goto retransmit_end;
+	}
+
+	if (pair->state != CHECK_IN_PROGRESS)
+	{
+		DBG2(DBG_IKE, "pair with id '%d' is in wrong state [%d], don't "
+			 "retransmit the connectivity check", data->mid, pair->state);
+		goto retransmit_end;
+	}
+
+	if (++pair->retransmitted > ME_MAX_RETRANS)
+	{
+		DBG2(DBG_IKE, "pair with id '%d' failed after %d retransmissions",
+			 data->mid, ME_MAX_RETRANS);
+		pair->state = CHECK_FAILED;
+		goto retransmit_end;
+	}
+
+	charon->sender->send(charon->sender, pair->packet->clone(pair->packet));
+
+	queue_retransmission(this, checklist, pair);
+
+retransmit_end:
+	update_checklist_state(this, checklist);
+
+	switch(checklist->state)
+	{
+		case CHECK_SUCCEEDED:
+		case CHECK_FAILED:
+			finish_checks(this, checklist);
+			break;
+		default:
+			break;
+	}
+
+	this->mutex->unlock(this->mutex);
+
+	/* we reschedule it manually */
+	return JOB_REQUEUE_NONE;
+}
+
+/**
+ * Queues a retransmission job
+ */
+static void queue_retransmission(private_connect_manager_t *this, check_list_t *checklist, endpoint_pair_t *pair)
+{
+	callback_data_t *data = retransmit_data_create(this, checklist->connect_id, pair->id);
+	job_t *job = (job_t*)callback_job_create((callback_job_cb_t)retransmit, data, (callback_job_cleanup_t)callback_data_destroy, NULL);
+
+	u_int32_t retransmission = pair->retransmitted + 1;
+	u_int32_t rto = ME_INTERVAL;
+	if (retransmission > ME_BOOST)
+	{
+		rto = (u_int32_t)(ME_INTERVAL * pow(ME_RETRANS_BASE, retransmission - ME_BOOST));
+	}
+	DBG2(DBG_IKE, "scheduling retransmission %d of pair '%d' in %dms",
+		 retransmission, pair->id, rto);
+
+	charon->scheduler->schedule_job_ms(charon->scheduler, (job_t*)job, rto);
+}
+
+/**
+ * Sends a check
+ */
+static void send_check(private_connect_manager_t *this, check_list_t *checklist,
+		check_t *check, endpoint_pair_t *pair, bool request)
+{
+	message_t *message = message_create();
+	message->set_message_id(message, check->mid);
+	message->set_exchange_type(message, INFORMATIONAL);
+	message->set_request(message, request);
+	message->set_destination(message, check->dst->clone(check->dst));
+	message->set_source(message, check->src->clone(check->src));
+
+	ike_sa_id_t *ike_sa_id = ike_sa_id_create(0, 0, request);
+	message->set_ike_sa_id(message, ike_sa_id);
+	ike_sa_id->destroy(ike_sa_id);
+
+	message->add_notify(message, FALSE, ME_CONNECTID, check->connect_id);
+	DBG2(DBG_IKE, "send ME_CONNECTID %#B", &check->connect_id);
+
+	notify_payload_t *endpoint = check->endpoint->build_notify(check->endpoint);
+	check->endpoint_raw = chunk_clone(endpoint->get_notification_data(endpoint));
+	message->add_payload(message, (payload_t*)endpoint);
+	DBG2(DBG_IKE, "send ME_ENDPOINT notify");
+
+	check->auth = build_signature(this, checklist, check, TRUE);
+	message->add_notify(message, FALSE, ME_CONNECTAUTH, check->auth);
+	DBG2(DBG_IKE, "send ME_CONNECTAUTH %#B", &check->auth);
+
+	packet_t *packet;
+	if (message->generate(message, NULL, NULL, &packet) == SUCCESS)
+	{
+		charon->sender->send(charon->sender, packet->clone(packet));
+
+		if (request)
+		{
+			DESTROY_IF(pair->packet);
+			pair->packet = packet;
+			pair->retransmitted = 0;
+			queue_retransmission(this, checklist, pair);
+		}
+		else
+		{
+			packet->destroy(packet);
+		}
+	}
+	message->destroy(message);
+}
+
+/**
+ * Queues a triggered check
+ */
+static void queue_triggered_check(private_connect_manager_t *this,
+		check_list_t *checklist, endpoint_pair_t *pair)
+{
+	DBG2(DBG_IKE, "queueing triggered check for pair '%d'", pair->id);
+	pair->state = CHECK_WAITING;
+	checklist->triggered->insert_last(checklist->triggered, pair);
+
+	if (!checklist->sender)
+	{
+		/* if the sender is not running we restart it */
+		schedule_checks(this, checklist, ME_INTERVAL);
+	}
+}
+
+/**
+ * This function is triggered for each checklist at a specific interval
+ */
+static job_requeue_t sender(callback_data_t *data)
+{
+	private_connect_manager_t *this = data->connect_manager;
+
+	this->mutex->lock(this->mutex);
+
+	check_list_t *checklist;
+	if (get_checklist_by_id(this, data->connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found, can't send "
+			 "connectivity check", &data->connect_id);
+		this->mutex->unlock(this->mutex);
+		return JOB_REQUEUE_NONE;
+	}
+
+	/* reset the sender */
+	checklist->sender = NULL;
+
+	endpoint_pair_t *pair;
+	if (get_triggered_pair(checklist, &pair) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "no triggered check queued, sending an ordinary check");
+
+		if (checklist->pairs->find_first(checklist->pairs,
+									(linked_list_match_t)match_waiting_pair,
+									(void**)&pair) != SUCCESS)
+		{
+			this->mutex->unlock(this->mutex);
+			DBG1(DBG_IKE, "no pairs in waiting state, aborting");
+			return JOB_REQUEUE_NONE;
+		}
+	}
+	else
+	{
+		DBG1(DBG_IKE, "triggered check found");
+	}
+
+	check_t *check = check_create();
+	check->mid = pair->id;
+	check->src = pair->local->clone(pair->local);
+	check->dst = pair->remote->clone(pair->remote);
+	check->connect_id = chunk_clone(checklist->connect_id);
+	check->endpoint = endpoint_notify_create_from_host(PEER_REFLEXIVE, NULL,
+													   NULL);
+
+	pair->state = CHECK_IN_PROGRESS;
+
+	send_check(this, checklist, check, pair, TRUE);
+
+	check_destroy(check);
+
+	/* schedule this job again */
+	schedule_checks(this, checklist, ME_INTERVAL);
+
+	this->mutex->unlock(this->mutex);
+
+	/* we reschedule it manually */
+	return JOB_REQUEUE_NONE;
+}
+
+/**
+ * Schedules checks for a checklist (time in ms)
+ */
+static void schedule_checks(private_connect_manager_t *this, check_list_t *checklist, u_int32_t time)
+{
+	callback_data_t *data = callback_data_create(this, checklist->connect_id);
+	checklist->sender = (job_t*)callback_job_create((callback_job_cb_t)sender, data, (callback_job_cleanup_t)callback_data_destroy, NULL);
+	charon->scheduler->schedule_job_ms(charon->scheduler, checklist->sender, time);
+}
+
+/**
+ * Initiates waiting mediated connections
+ */
+static job_requeue_t initiate_mediated(initiate_data_t *data)
+{
+	check_list_t *checklist = data->checklist;
+	initiated_t *initiated = data->initiated;
+
+	endpoint_pair_t *pair;
+	if (get_best_valid_pair(checklist, &pair) == SUCCESS)
+	{
+		ike_sa_id_t *waiting_sa;
+		iterator_t *iterator = initiated->mediated->create_iterator(initiated->mediated, TRUE);
+		while (iterator->iterate(iterator, (void**)&waiting_sa))
+		{
+			ike_sa_t *sa = charon->ike_sa_manager->checkout(charon->ike_sa_manager, waiting_sa);
+			if (sa->initiate_mediated(sa, pair->local, pair->remote, checklist->connect_id) != SUCCESS)
+			{
+				DBG1(DBG_IKE, "establishing mediated connection failed");
+				charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager, sa);
+			}
+			charon->ike_sa_manager->checkin(charon->ike_sa_manager, sa);
+		}
+		iterator->destroy(iterator);
+	}
+	else
+	{
+		/* this should (can?) not happen */
+	}
+
+	return JOB_REQUEUE_NONE;
+}
+
+/**
+ * Finishes checks for a checklist
+ */
+static void finish_checks(private_connect_manager_t *this, check_list_t *checklist)
+{
+	if (checklist->is_initiator)
+	{
+		initiated_t *initiated;
+		if (get_initiated_by_ids(this, checklist->initiator.id,
+				checklist->responder.id, &initiated) == SUCCESS)
+		{
+			remove_checklist(this, checklist);
+			remove_initiated(this, initiated);
+
+			initiate_data_t *data = initiate_data_create(checklist, initiated);
+			job_t *job = (job_t*)callback_job_create((callback_job_cb_t)initiate_mediated, data, (callback_job_cleanup_t)initiate_data_destroy, NULL);
+			charon->processor->queue_job(charon->processor, job);
+			return;
+		}
+		else
+		{
+			DBG1(DBG_IKE, "there is no mediated connection waiting between '%Y'"
+				 " and '%Y'", checklist->initiator.id, checklist->responder.id);
+		}
+	}
+}
+
+/**
+ * Process the response to one of our requests
+ */
+static void process_response(private_connect_manager_t *this, check_t *check,
+		check_list_t *checklist)
+{
+	endpoint_pair_t *pair;
+	if (get_pair_by_id(checklist, check->mid, &pair) == SUCCESS)
+	{
+		if (pair->local->equals(pair->local, check->dst) &&
+			pair->remote->equals(pair->remote, check->src))
+		{
+			DBG1(DBG_IKE, "endpoint pair '%d' is valid: '%#H' - '%#H'",
+				 pair->id, pair->local, pair->remote);
+			pair->state = CHECK_SUCCEEDED;
+		}
+
+		linked_list_t *local_endpoints = checklist->is_initiator ?
+			checklist->initiator.endpoints : checklist->responder.endpoints;
+
+		endpoint_notify_t *local_endpoint;
+		if (endpoints_contain(local_endpoints,
+							  check->endpoint->get_host(check->endpoint),
+							  &local_endpoint) != SUCCESS)
+		{
+			local_endpoint = endpoint_notify_create_from_host(PEER_REFLEXIVE,
+					check->endpoint->get_host(check->endpoint), pair->local);
+			local_endpoint->set_priority(local_endpoint,
+								check->endpoint->get_priority(check->endpoint));
+			local_endpoints->insert_last(local_endpoints, local_endpoint);
+		}
+
+		update_checklist_state(this, checklist);
+
+		switch(checklist->state)
+		{
+			case CHECK_SUCCEEDED:
+			case CHECK_FAILED:
+				finish_checks(this, checklist);
+				break;
+			default:
+				break;
+		}
+	}
+	else
+	{
+		DBG1(DBG_IKE, "pair with id '%d' not found", check->mid);
+	}
+}
+
+static void process_request(private_connect_manager_t *this, check_t *check,
+							check_list_t *checklist)
+{
+	linked_list_t *remote_endpoints = checklist->is_initiator ?
+				checklist->responder.endpoints : checklist->initiator.endpoints;
+
+	endpoint_notify_t *peer_reflexive, *remote_endpoint;
+	peer_reflexive = endpoint_notify_create_from_host(PEER_REFLEXIVE,
+													  check->src, NULL);
+	peer_reflexive->set_priority(peer_reflexive,
+							check->endpoint->get_priority(check->endpoint));
+
+	if (endpoints_contain(remote_endpoints, check->src, &remote_endpoint) != SUCCESS)
+	{
+		remote_endpoint = peer_reflexive->clone(peer_reflexive);
+		remote_endpoints->insert_last(remote_endpoints, remote_endpoint);
+	}
+
+	endpoint_pair_t *pair;
+	if (get_pair_by_hosts(checklist->pairs, check->dst, check->src,
+						  &pair) == SUCCESS)
+	{
+		switch(pair->state)
+		{
+			case CHECK_IN_PROGRESS:
+				/* prevent retransmissions */
+				pair->retransmitted = ME_MAX_RETRANS;
+				/* FIXME: we should wait to the next rto to send the triggered
+				 * check */
+				/* fall-through */
+			case CHECK_WAITING:
+			case CHECK_FAILED:
+				queue_triggered_check(this, checklist, pair);
+				break;
+			case CHECK_SUCCEEDED:
+			default:
+				break;
+		}
+	}
+	else
+	{
+		endpoint_notify_t *local_endpoint = endpoint_notify_create_from_host(HOST, check->dst, NULL);
+
+		endpoint_notify_t *initiator = checklist->is_initiator ? local_endpoint : remote_endpoint;
+		endpoint_notify_t *responder = checklist->is_initiator ? remote_endpoint : local_endpoint;
+
+		pair = endpoint_pair_create(initiator, responder, checklist->is_initiator);
+		pair->id = checklist->pairs->get_count(checklist->pairs) + 1;
+
+		insert_pair_by_priority(checklist->pairs, pair);
+
+		queue_triggered_check(this, checklist, pair);
+
+		local_endpoint->destroy(local_endpoint);
+	}
+
+	check_t *response = check_create();
+
+	response->mid = check->mid;
+	response->src = check->dst->clone(check->dst);
+	response->dst = check->src->clone(check->src);
+	response->connect_id = chunk_clone(check->connect_id);
+	response->endpoint = peer_reflexive;
+
+	send_check(this, checklist, response, pair, FALSE);
+
+	check_destroy(response);
+}
+
+/**
+ * Implementation of connect_manager_t.process_check.
+ */
+static void process_check(private_connect_manager_t *this, message_t *message)
+{
+	if (message->parse_body(message, NULL, NULL) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "%N %s with message ID %d processing failed",
+			 exchange_type_names, message->get_exchange_type(message),
+			 message->get_request(message) ? "request" : "response",
+			 message->get_message_id(message));
+		return;
+	}
+
+	check_t *check = check_create();
+	check->mid = message->get_message_id(message);
+	check->src = message->get_source(message);
+	check->src = check->src->clone(check->src);
+	check->dst = message->get_destination(message);
+	check->dst = check->dst->clone(check->dst);
+
+	if (process_payloads(message, check) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "invalid connectivity check %s received",
+			 message->get_request(message) ? "request" : "response");
+		check_destroy(check);
+		return;
+	}
+
+	this->mutex->lock(this->mutex);
+
+	check_list_t *checklist;
+	if (get_checklist_by_id(this, check->connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found",
+			 &check->connect_id);
+		check_destroy(check);
+		this->mutex->unlock(this->mutex);
+		return;
+	}
+
+	chunk_t sig = build_signature(this, checklist, check, FALSE);
+	if (!chunk_equals(sig, check->auth))
+	{
+		DBG1(DBG_IKE, "connectivity check verification failed");
+		check_destroy(check);
+		chunk_free(&sig);
+		this->mutex->unlock(this->mutex);
+		return;
+	}
+	chunk_free(&sig);
+
+	if (message->get_request(message))
+	{
+		process_request(this, check, checklist);
+	}
+	else
+	{
+		process_response(this, check, checklist);
+	}
+
+	this->mutex->unlock(this->mutex);
+
+	check_destroy(check);
+}
+
+/**
+ * Implementation of connect_manager_t.check_and_register.
+ */
+static bool check_and_register(private_connect_manager_t *this,
+			identification_t *id, identification_t *peer_id,
+			ike_sa_id_t *mediated_sa)
+{
+	initiated_t *initiated;
+	bool already_there = TRUE;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_initiated_by_ids(this, id, peer_id, &initiated) != SUCCESS)
+	{
+		DBG2(DBG_IKE, "registered waiting mediated connection with '%Y'",
+			 peer_id);
+		initiated = initiated_create(id, peer_id);
+		this->initiated->insert_last(this->initiated, initiated);
+		already_there = FALSE;
+	}
+
+	if (initiated->mediated->find_first(initiated->mediated,
+								(linked_list_match_t)mediated_sa->equals,
+								NULL, mediated_sa) != SUCCESS)
+	{
+		initiated->mediated->insert_last(initiated->mediated,
+										 mediated_sa->clone(mediated_sa));
+	}
+
+	this->mutex->unlock(this->mutex);
+
+	return already_there;
+}
+
+/**
+ * Implementation of connect_manager_t.check_and_initiate.
+ */
+static void check_and_initiate(private_connect_manager_t *this,
+							   ike_sa_id_t *mediation_sa, identification_t *id,
+							   identification_t *peer_id)
+{
+	initiated_t *initiated;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_initiated_by_ids(this, id, peer_id, &initiated) != SUCCESS)
+	{
+		DBG2(DBG_IKE, "no waiting mediated connections with '%Y'", peer_id);
+		this->mutex->unlock(this->mutex);
+		return;
+	}
+
+	ike_sa_id_t *waiting_sa;
+	iterator_t *iterator = initiated->mediated->create_iterator(
+													initiated->mediated, TRUE);
+	while (iterator->iterate(iterator, (void**)&waiting_sa))
+	{
+		job_t *job = (job_t*)reinitiate_mediation_job_create(mediation_sa,
+															 waiting_sa);
+		charon->processor->queue_job(charon->processor, job);
+	}
+	iterator->destroy(iterator);
+
+	this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of connect_manager_t.set_initiator_data.
+ */
+static status_t set_initiator_data(private_connect_manager_t *this,
+								   identification_t *initiator,
+								   identification_t *responder,
+								   chunk_t connect_id, chunk_t key,
+								   linked_list_t *endpoints, bool is_initiator)
+{
+	check_list_t *checklist;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_checklist_by_id(this, connect_id, NULL) == SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' already exists, aborting",
+			 &connect_id);
+		this->mutex->unlock(this->mutex);
+		return FAILED;
+	}
+
+	checklist = check_list_create(initiator, responder, connect_id, key,
+								  endpoints, is_initiator);
+	this->checklists->insert_last(this->checklists, checklist);
+
+	this->mutex->unlock(this->mutex);
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of connect_manager_t.set_responder_data.
+ */
+static status_t set_responder_data(private_connect_manager_t *this,
+								   chunk_t connect_id, chunk_t key,
+								   linked_list_t *endpoints)
+{
+	check_list_t *checklist;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_checklist_by_id(this, connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found",
+			 &connect_id);
+		this->mutex->unlock(this->mutex);
+		return NOT_FOUND;
+	}
+
+	checklist->responder.key = chunk_clone(key);
+	checklist->responder.endpoints = endpoints->clone_offset(endpoints,
+											offsetof(endpoint_notify_t, clone));
+	checklist->state = CHECK_WAITING;
+
+	build_pairs(checklist);
+
+	/* send the first check immediately */
+	schedule_checks(this, checklist, 0);
+
+	this->mutex->unlock(this->mutex);
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of connect_manager_t.stop_checks.
+ */
+static status_t stop_checks(private_connect_manager_t *this, chunk_t connect_id)
+{
+	check_list_t *checklist;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_checklist_by_id(this, connect_id, &checklist) != SUCCESS)
+	{
+		DBG1(DBG_IKE, "checklist with id '%#B' not found",
+			 &connect_id);
+		this->mutex->unlock(this->mutex);
+		return NOT_FOUND;
+	}
+
+	DBG1(DBG_IKE, "removing checklist with id '%#B'", &connect_id);
+
+	remove_checklist(this, checklist);
+	check_list_destroy(checklist);
+
+	this->mutex->unlock(this->mutex);
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of connect_manager_t.destroy.
+ */
+static void destroy(private_connect_manager_t *this)
+{
+	this->mutex->lock(this->mutex);
+
+	this->hasher->destroy(this->hasher);
+	this->checklists->destroy_function(this->checklists, (void*)check_list_destroy);
+	this->initiated->destroy_function(this->initiated, (void*)initiated_destroy);
+
+	this->mutex->unlock(this->mutex);
+	this->mutex->destroy(this->mutex);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+connect_manager_t *connect_manager_create()
+{
+	private_connect_manager_t *this = malloc_thing(private_connect_manager_t);
+
+	this->public.destroy = (void(*)(connect_manager_t*))destroy;
+	this->public.check_and_register = (bool(*)(connect_manager_t*,identification_t*,identification_t*,ike_sa_id_t*))check_and_register;
+	this->public.check_and_initiate = (void(*)(connect_manager_t*,ike_sa_id_t*,identification_t*,identification_t*))check_and_initiate;
+	this->public.set_initiator_data = (status_t(*)(connect_manager_t*,identification_t*,identification_t*,chunk_t,chunk_t,linked_list_t*,bool))set_initiator_data;
+	this->public.set_responder_data = (status_t(*)(connect_manager_t*,chunk_t,chunk_t,linked_list_t*))set_responder_data;
+	this->public.process_check = (void(*)(connect_manager_t*,message_t*))process_check;
+	this->public.stop_checks = (status_t(*)(connect_manager_t*,chunk_t))stop_checks;
+
+	this->hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
+	if (this->hasher == NULL)
+	{
+		DBG1(DBG_IKE, "unable to create connect manager, SHA1 not supported");
+		free(this);
+		return NULL;
+	}
+
+	this->checklists = linked_list_create();
+	this->initiated = linked_list_create();
+
+	this->mutex = mutex_create(MUTEX_TYPE_DEFAULT);
+
+	return (connect_manager_t*)this;
+}
diff --git a/src/libcharon/sa/connect_manager.h b/src/libcharon/sa/connect_manager.h
new file mode 100644
index 000000000..8fa8ff697
--- /dev/null
+++ b/src/libcharon/sa/connect_manager.h
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2007-2008 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup connect_manager connect_manager
+ * @{ @ingroup sa
+ */
+
+#ifndef CONNECT_MANAGER_H_
+#define CONNECT_MANAGER_H_
+
+typedef struct connect_manager_t connect_manager_t;
+
+#include <encoding/message.h>
+#include <sa/ike_sa_id.h>
+#include <utils/identification.h>
+
+/**
+ * The connection manager is responsible for establishing a direct
+ * connection with another peer.
+ */
+struct connect_manager_t {
+
+	/**
+	 * Checks if a there is already a mediated connection registered
+	 * between two peers.
+	 *
+	 * @param id			my id
+	 * @param peer_id		the other peer's id
+	 * @param mediated_sa	the IKE_SA ID of the mediated connection
+	 * @returns
+	 *						- TRUE, if a mediated connection is registered
+	 *						- FALSE, otherwise
+	 */
+	bool (*check_and_register) (connect_manager_t *this, identification_t *id,
+								identification_t *peer_id,
+								ike_sa_id_t *mediated_sa);
+
+	/**
+	 * Checks if there are waiting connections with a specific peer.
+	 * If so, reinitiate them.
+	 *
+	 * @param id			my id
+	 * @param peer_id		the other peer's id
+	 */
+	void (*check_and_initiate) (connect_manager_t *this,
+								ike_sa_id_t *mediation_sa, identification_t *id,
+								identification_t *peer_id);
+
+	/**
+	 * Creates a checklist and sets the initiator's data.
+	 *
+	 * @param initiator		ID of the initiator
+	 * @param responder		ID of the responder
+	 * @param connect_id	the connect ID provided by the initiator
+	 * @param key			the initiator's key
+	 * @param endpoints		the initiator's endpoints
+	 * @param is_initiator	TRUE, if the caller of this method is the initiator
+	 * @returns				SUCCESS
+	 */
+	status_t (*set_initiator_data) (connect_manager_t *this,
+									identification_t *initiator,
+									identification_t *responder,
+									chunk_t connect_id, chunk_t key,
+									linked_list_t *endpoints,
+									bool is_initiator);
+
+	/**
+	 * Updates a checklist and sets the responder's data. The checklist's
+	 * state is advanced to WAITING which means that checks will be sent.
+	 *
+	 * @param connect_id	the connect ID
+	 * @param chunk_t		the responder's key
+	 * @param endpoints		the responder's endpoints
+	 * @returns
+	 *						- NOT_FOUND, if the checklist has not been found
+	 *						- SUCCESS, otherwise
+	 */
+	status_t (*set_responder_data) (connect_manager_t *this,
+									chunk_t connect_id, chunk_t key,
+									linked_list_t *endpoints);
+
+	/**
+	 * Stops checks for a checklist. Called after the responder received an
+	 * IKE_SA_INIT request which contains a ME_CONNECTID payload.
+	 *
+	 * @param connect_id	the connect ID
+	 * @returns
+	 *						- NOT_FOUND, if the checklist has not been found
+	 *						- SUCCESS, otherwise
+	 */
+	status_t (*stop_checks) (connect_manager_t *this, chunk_t connect_id);
+
+	/**
+	 * Processes a connectivity check
+	 *
+	 * @param message		the received message
+	 */
+	void (*process_check) (connect_manager_t *this, message_t *message);
+
+	/**
+	 * Destroys the manager with all data.
+	 */
+	void (*destroy) (connect_manager_t *this);
+};
+
+/**
+ * Create a manager.
+ *
+ * @returns	connect_manager_t object
+ */
+connect_manager_t *connect_manager_create(void);
+
+#endif /** CONNECT_MANAGER_H_ @}*/
diff --git a/src/libcharon/sa/ike_sa.c b/src/libcharon/sa/ike_sa.c
new file mode 100644
index 000000000..023f0749f
--- /dev/null
+++ b/src/libcharon/sa/ike_sa.c
@@ -0,0 +1,2227 @@
+/*
+ * Copyright (C) 2006-2008 Tobias Brunner
+ * Copyright (C) 2006 Daniel Roethlisberger
+ * Copyright (C) 2005-2009 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include <string.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <time.h>
+
+#include "ike_sa.h"
+
+#include <library.h>
+#include <daemon.h>
+#include <hydra.h>
+#include <utils/linked_list.h>
+#include <utils/lexparser.h>
+#include <sa/task_manager.h>
+#include <sa/tasks/ike_init.h>
+#include <sa/tasks/ike_natd.h>
+#include <sa/tasks/ike_mobike.h>
+#include <sa/tasks/ike_auth.h>
+#include <sa/tasks/ike_auth_lifetime.h>
+#include <sa/tasks/ike_config.h>
+#include <sa/tasks/ike_cert_pre.h>
+#include <sa/tasks/ike_cert_post.h>
+#include <sa/tasks/ike_rekey.h>
+#include <sa/tasks/ike_reauth.h>
+#include <sa/tasks/ike_delete.h>
+#include <sa/tasks/ike_dpd.h>
+#include <sa/tasks/ike_vendor.h>
+#include <sa/tasks/child_create.h>
+#include <sa/tasks/child_delete.h>
+#include <sa/tasks/child_rekey.h>
+#include <processing/jobs/retransmit_job.h>
+#include <processing/jobs/delete_ike_sa_job.h>
+#include <processing/jobs/send_dpd_job.h>
+#include <processing/jobs/send_keepalive_job.h>
+#include <processing/jobs/rekey_ike_sa_job.h>
+
+#ifdef ME
+#include <sa/tasks/ike_me.h>
+#include <processing/jobs/initiate_mediation_job.h>
+#endif
+
+ENUM(ike_sa_state_names, IKE_CREATED, IKE_DESTROYING,
+	"CREATED",
+	"CONNECTING",
+	"ESTABLISHED",
+	"PASSIVE",
+	"REKEYING",
+	"DELETING",
+	"DESTROYING",
+);
+
+typedef struct private_ike_sa_t private_ike_sa_t;
+typedef struct attribute_entry_t attribute_entry_t;
+
+/**
+ * Private data of an ike_sa_t object.
+ */
+struct private_ike_sa_t {
+
+	/**
+	 * Public members
+	 */
+	ike_sa_t public;
+
+	/**
+	 * Identifier for the current IKE_SA.
+	 */
+	ike_sa_id_t *ike_sa_id;
+
+	/**
+	 * unique numerical ID for this IKE_SA.
+	 */
+	u_int32_t unique_id;
+
+	/**
+	 * Current state of the IKE_SA
+	 */
+	ike_sa_state_t state;
+
+	/**
+	 * IKE configuration used to set up this IKE_SA
+	 */
+	ike_cfg_t *ike_cfg;
+
+	/**
+	 * Peer and authentication information to establish IKE_SA.
+	 */
+	peer_cfg_t *peer_cfg;
+
+	/**
+	 * currently used authentication ruleset, local (as auth_cfg_t)
+	 */
+	auth_cfg_t *my_auth;
+
+	/**
+	 * list of completed local authentication rounds
+	 */
+	linked_list_t *my_auths;
+
+	/**
+	 * list of completed remote authentication rounds
+	 */
+	linked_list_t *other_auths;
+
+	/**
+	 * currently used authentication constraints, remote (as auth_cfg_t)
+	 */
+	auth_cfg_t *other_auth;
+
+	/**
+	 * Selected IKE proposal
+	 */
+	proposal_t *proposal;
+
+	/**
+	 * Juggles tasks to process messages
+	 */
+	task_manager_t *task_manager;
+
+	/**
+	 * Address of local host
+	 */
+	host_t *my_host;
+
+	/**
+	 * Address of remote host
+	 */
+	host_t *other_host;
+
+#ifdef ME
+	/**
+	 * Are we mediation server
+	 */
+	bool is_mediation_server;
+
+	/**
+	 * Server reflexive host
+	 */
+	host_t *server_reflexive_host;
+
+	/**
+	 * Connect ID
+	 */
+	chunk_t connect_id;
+#endif /* ME */
+
+	/**
+	 * Identification used for us
+	 */
+	identification_t *my_id;
+
+	/**
+	 * Identification used for other
+	 */
+	identification_t *other_id;
+
+	/**
+	 * set of extensions the peer supports
+	 */
+	ike_extension_t extensions;
+
+	/**
+	 * set of condition flags currently enabled for this IKE_SA
+	 */
+	ike_condition_t conditions;
+
+	/**
+	 * Linked List containing the child sa's of the current IKE_SA.
+	 */
+	linked_list_t *child_sas;
+
+	/**
+	 * keymat of this IKE_SA
+	 */
+	keymat_t *keymat;
+
+	/**
+	 * Virtual IP on local host, if any
+	 */
+	host_t *my_virtual_ip;
+
+	/**
+	 * Virtual IP on remote host, if any
+	 */
+	host_t *other_virtual_ip;
+
+	/**
+	 * List of configuration attributes (attribute_entry_t)
+	 */
+	linked_list_t *attributes;
+
+	/**
+	 * list of peers additional addresses, transmitted via MOBIKE
+	 */
+	linked_list_t *additional_addresses;
+
+	/**
+	 * previously value of received DESTINATION_IP hash
+	 */
+	chunk_t nat_detection_dest;
+
+	/**
+	 * number pending UPDATE_SA_ADDRESS (MOBIKE)
+	 */
+	u_int32_t pending_updates;
+
+	/**
+	 * NAT keep alive interval
+	 */
+	u_int32_t keepalive_interval;
+
+	/**
+	 * Timestamps for this IKE_SA
+	 */
+	u_int32_t stats[STAT_MAX];
+
+	/**
+	 * how many times we have retried so far (keyingtries)
+	 */
+	u_int32_t keyingtry;
+
+	/**
+	 * local host address to be used for IKE, set via MIGRATE kernel message
+	 */
+	host_t *local_host;
+
+	/**
+	 * remote host address to be used for IKE, set via MIGRATE kernel message
+	 */
+	host_t *remote_host;
+};
+
+/**
+ * Entry to maintain install configuration attributes during IKE_SA lifetime
+ */
+struct attribute_entry_t {
+	/** handler used to install this attribute */
+	attribute_handler_t *handler;
+	/** attribute type */
+	configuration_attribute_type_t type;
+	/** attribute data */
+	chunk_t data;
+};
+
+/**
+ * get the time of the latest traffic processed by the kernel
+ */
+static time_t get_use_time(private_ike_sa_t* this, bool inbound)
+{
+	enumerator_t *enumerator;
+	child_sa_t *child_sa;
+	time_t use_time, current;
+
+	if (inbound)
+	{
+		use_time = this->stats[STAT_INBOUND];
+	}
+	else
+	{
+		use_time = this->stats[STAT_OUTBOUND];
+	}
+	enumerator = this->child_sas->create_enumerator(this->child_sas);
+	while (enumerator->enumerate(enumerator, &child_sa))
+	{
+		child_sa->get_usestats(child_sa, inbound, &current, NULL);
+		use_time = max(use_time, current);
+	}
+	enumerator->destroy(enumerator);
+
+	return use_time;
+}
+
+/**
+ * Implementation of ike_sa_t.get_unique_id
+ */
+static u_int32_t get_unique_id(private_ike_sa_t *this)
+{
+	return this->unique_id;
+}
+
+/**
+ * Implementation of ike_sa_t.get_name.
+ */
+static char *get_name(private_ike_sa_t *this)
+{
+	if (this->peer_cfg)
+	{
+		return this->peer_cfg->get_name(this->peer_cfg);
+	}
+	return "(unnamed)";
+}
+
+/**
+ * Implementation of ike_sa_t.get_statistic.
+ */
+static u_int32_t get_statistic(private_ike_sa_t *this, statistic_t kind)
+{
+	if (kind < STAT_MAX)
+	{
+		return this->stats[kind];
+	}
+	return 0;
+}
+
+/**
+ * Implementation of ike_sa_t.get_my_host.
+ */
+static host_t *get_my_host(private_ike_sa_t *this)
+{
+	return this->my_host;
+}
+
+/**
+ * Implementation of ike_sa_t.set_my_host.
+ */
+static void set_my_host(private_ike_sa_t *this, host_t *me)
+{
+	DESTROY_IF(this->my_host);
+	this->my_host = me;
+}
+
+/**
+ * Implementation of ike_sa_t.get_other_host.
+ */
+static host_t *get_other_host(private_ike_sa_t *this)
+{
+	return this->other_host;
+}
+
+/**
+ * Implementation of ike_sa_t.set_other_host.
+ */
+static void set_other_host(private_ike_sa_t *this, host_t *other)
+{
+	DESTROY_IF(this->other_host);
+	this->other_host = other;
+}
+
+/**
+ * Implementation of ike_sa_t.get_peer_cfg
+ */
+static peer_cfg_t* get_peer_cfg(private_ike_sa_t *this)
+{
+	return this->peer_cfg;
+}
+
+/**
+ * Implementation of ike_sa_t.set_peer_cfg
+ */
+static void set_peer_cfg(private_ike_sa_t *this, peer_cfg_t *peer_cfg)
+{
+	DESTROY_IF(this->peer_cfg);
+	peer_cfg->get_ref(peer_cfg);
+	this->peer_cfg = peer_cfg;
+
+	if (this->ike_cfg == NULL)
+	{
+		this->ike_cfg = peer_cfg->get_ike_cfg(peer_cfg);
+		this->ike_cfg->get_ref(this->ike_cfg);
+	}
+}
+
+/**
+ * Implementation of ike_sa_t.get_auth_cfg
+ */
+static auth_cfg_t* get_auth_cfg(private_ike_sa_t *this, bool local)
+{
+	if (local)
+	{
+		return this->my_auth;
+	}
+	return this->other_auth;
+}
+
+/**
+ * Implementation of ike_sa_t.add_auth_cfg
+ */
+static void add_auth_cfg(private_ike_sa_t *this, bool local, auth_cfg_t *cfg)
+{
+	if (local)
+	{
+		this->my_auths->insert_last(this->my_auths, cfg);
+	}
+	else
+	{
+		this->other_auths->insert_last(this->other_auths, cfg);
+	}
+}
+
+/**
+ * Implementation of ike_sa_t.create_auth_cfg_enumerator
+ */
+static enumerator_t* create_auth_cfg_enumerator(private_ike_sa_t *this,
+												bool local)
+{
+	if (local)
+	{
+		return this->my_auths->create_enumerator(this->my_auths);
+	}
+	return this->other_auths->create_enumerator(this->other_auths);
+}
+
+/**
+ * Flush the stored authentication round information
+ */
+static void flush_auth_cfgs(private_ike_sa_t *this)
+{
+	auth_cfg_t *cfg;
+
+	if (lib->settings->get_bool(lib->settings, "charon.flush_auth_cfg", FALSE))
+	{
+		while (this->my_auths->remove_last(this->my_auths,
+										   (void**)&cfg) == SUCCESS)
+		{
+			cfg->destroy(cfg);
+		}
+		while (this->other_auths->remove_last(this->other_auths,
+											  (void**)&cfg) == SUCCESS)
+		{
+			cfg->destroy(cfg);
+		}
+	}
+}
+
+/**
+ * Implementation of ike_sa_t.get_proposal
+ */
+static proposal_t* get_proposal(private_ike_sa_t *this)
+{
+	return this->proposal;
+}
+
+/**
+ * Implementation of ike_sa_t.set_proposal
+ */
+static void set_proposal(private_ike_sa_t *this, proposal_t *proposal)
+{
+	DESTROY_IF(this->proposal);
+	this->proposal = proposal->clone(proposal);
+}
+
+/**
+ * Implementation of ike_sa_t.set_message_id
+ */
+static void set_message_id(private_ike_sa_t *this, bool initiate, u_int32_t mid)
+{
+	if (initiate)
+	{
+		this->task_manager->reset(this->task_manager, mid, UINT_MAX);
+	}
+	else
+	{
+		this->task_manager->reset(this->task_manager, UINT_MAX, mid);
+	}
+}
+
+/**
+ * Implementation of ike_sa_t.send_keepalive
+ */
+static void send_keepalive(private_ike_sa_t *this)
+{
+	send_keepalive_job_t *job;
+	time_t last_out, now, diff;
+
+	if (!(this->conditions & COND_NAT_HERE) || this->keepalive_interval == 0)
+	{	/* disable keep alives if we are not NATed anymore */
+		return;
+	}
+
+	last_out = get_use_time(this, FALSE);
+	now = time_monotonic(NULL);
+
+	diff = now - last_out;
+
+	if (diff >= this->keepalive_interval)
+	{
+		packet_t *packet;
+		chunk_t data;
+
+		packet = packet_create();
+		packet->set_source(packet, this->my_host->clone(this->my_host));
+		packet->set_destination(packet, this->other_host->clone(this->other_host));
+		data.ptr = malloc(1);
+		data.ptr[0] = 0xFF;
+		data.len = 1;
+		packet->set_data(packet, data);
+		DBG1(DBG_IKE, "sending keep alive");
+		charon->sender->send(charon->sender, packet);
+		diff = 0;
+	}
+	job = send_keepalive_job_create(this->ike_sa_id);
+	charon->scheduler->schedule_job(charon->scheduler, (job_t*)job,
+									this->keepalive_interval - diff);
+}
+
+/**
+ * Implementation of ike_sa_t.get_ike_cfg
+ */
+static ike_cfg_t *get_ike_cfg(private_ike_sa_t *this)
+{
+	return this->ike_cfg;
+}
+
+/**
+ * Implementation of ike_sa_t.set_ike_cfg
+ */
+static void set_ike_cfg(private_ike_sa_t *this, ike_cfg_t *ike_cfg)
+{
+	ike_cfg->get_ref(ike_cfg);
+	this->ike_cfg = ike_cfg;
+}
+
+/**
+ * Implementation of ike_sa_t.enable_extension.
+ */
+static void enable_extension(private_ike_sa_t *this, ike_extension_t extension)
+{
+	this->extensions |= extension;
+}
+
+/**
+ * Implementation of ike_sa_t.has_extension.
+ */
+static bool supports_extension(private_ike_sa_t *this, ike_extension_t extension)
+{
+	return (this->extensions & extension) != FALSE;
+}
+
+/**
+ * Implementation of ike_sa_t.has_condition.
+ */
+static bool has_condition(private_ike_sa_t *this, ike_condition_t condition)
+{
+	return (this->conditions & condition) != FALSE;
+}
+
+/**
+ * Implementation of ike_sa_t.enable_condition.
+ */
+static void set_condition(private_ike_sa_t *this, ike_condition_t condition,
+						  bool enable)
+{
+	if (has_condition(this, condition) != enable)
+	{
+		if (enable)
+		{
+			this->conditions |= condition;
+			switch (condition)
+			{
+				case COND_NAT_HERE:
+					DBG1(DBG_IKE, "local host is behind NAT, sending keep alives");
+					this->conditions |= COND_NAT_ANY;
+					send_keepalive(this);
+					break;
+				case COND_NAT_THERE:
+					DBG1(DBG_IKE, "remote host is behind NAT");
+					this->conditions |= COND_NAT_ANY;
+					break;
+				case COND_NAT_FAKE:
+					DBG1(DBG_IKE, "faking NAT situation to enforce UDP encapsulation");
+					this->conditions |= COND_NAT_ANY;
+					break;
+				default:
+					break;
+			}
+		}
+		else
+		{
+			this->conditions &= ~condition;
+			switch (condition)
+			{
+				case COND_NAT_HERE:
+				case COND_NAT_FAKE:
+				case COND_NAT_THERE:
+					set_condition(this, COND_NAT_ANY,
+								  has_condition(this, COND_NAT_HERE) ||
+								  has_condition(this, COND_NAT_THERE) ||
+								  has_condition(this, COND_NAT_FAKE));
+					break;
+				default:
+					break;
+			}
+		}
+	}
+}
+
+/**
+ * Implementation of ike_sa_t.send_dpd
+ */
+static status_t send_dpd(private_ike_sa_t *this)
+{
+	job_t *job;
+	time_t diff, delay;
+
+	delay = this->peer_cfg->get_dpd(this->peer_cfg);
+
+	if (delay == 0)
+	{
+		/* DPD disabled */
+		return SUCCESS;
+	}
+
+	if (this->task_manager->busy(this->task_manager))
+	{
+		/* an exchange is in the air, no need to start a DPD check */
+		diff = 0;
+	}
+	else
+	{
+		/* check if there was any inbound traffic */
+		time_t last_in, now;
+		last_in = get_use_time(this, TRUE);
+		now = time_monotonic(NULL);
+		diff = now - last_in;
+		if (diff >= delay)
+		{
+			/* to long ago, initiate dead peer detection */
+			task_t *task;
+			ike_mobike_t *mobike;
+
+			if (supports_extension(this, EXT_MOBIKE) &&
+				has_condition(this, COND_NAT_HERE))
+			{
+				/* use mobike enabled DPD to detect NAT mapping changes */
+				mobike = ike_mobike_create(&this->public, TRUE);
+				mobike->dpd(mobike);
+				task = &mobike->task;
+			}
+			else
+			{
+				task = (task_t*)ike_dpd_create(TRUE);
+			}
+			diff = 0;
+			DBG1(DBG_IKE, "sending DPD request");
+
+			this->task_manager->queue_task(this->task_manager, task);
+			this->task_manager->initiate(this->task_manager);
+		}
+	}
+	/* recheck in "interval" seconds */
+	job = (job_t*)send_dpd_job_create(this->ike_sa_id);
+	charon->scheduler->schedule_job(charon->scheduler, job, delay - diff);
+	return SUCCESS;
+}
+
+/**
+ * Implementation of ike_sa_t.get_state.
+ */
+static ike_sa_state_t get_state(private_ike_sa_t *this)
+{
+	return this->state;
+}
+
+/**
+ * Implementation of ike_sa_t.set_state.
+ */
+static void set_state(private_ike_sa_t *this, ike_sa_state_t state)
+{
+	DBG2(DBG_IKE, "IKE_SA %s[%d] state change: %N => %N",
+		 get_name(this), this->unique_id,
+		 ike_sa_state_names, this->state,
+		 ike_sa_state_names, state);
+
+	switch (state)
+	{
+		case IKE_ESTABLISHED:
+		{
+			if (this->state == IKE_CONNECTING ||
+				this->state == IKE_PASSIVE)
+			{
+				job_t *job;
+				u_int32_t t;
+
+				/* calculate rekey, reauth and lifetime */
+				this->stats[STAT_ESTABLISHED] = time_monotonic(NULL);
+
+				/* schedule rekeying if we have a time which is smaller than
+				 * an already scheduled rekeying */
+				t = this->peer_cfg->get_rekey_time(this->peer_cfg);
+				if (t && (this->stats[STAT_REKEY] == 0 ||
+					(this->stats[STAT_REKEY] > t + this->stats[STAT_ESTABLISHED])))
+				{
+					this->stats[STAT_REKEY] = t + this->stats[STAT_ESTABLISHED];
+					job = (job_t*)rekey_ike_sa_job_create(this->ike_sa_id, FALSE);
+					charon->scheduler->schedule_job(charon->scheduler, job, t);
+					DBG1(DBG_IKE, "scheduling rekeying in %ds", t);
+				}
+				t = this->peer_cfg->get_reauth_time(this->peer_cfg);
+				if (t && (this->stats[STAT_REAUTH] == 0 ||
+					(this->stats[STAT_REAUTH] > t + this->stats[STAT_ESTABLISHED])))
+				{
+					this->stats[STAT_REAUTH] = t + this->stats[STAT_ESTABLISHED];
+					job = (job_t*)rekey_ike_sa_job_create(this->ike_sa_id, TRUE);
+					charon->scheduler->schedule_job(charon->scheduler, job, t);
+					DBG1(DBG_IKE, "scheduling reauthentication in %ds", t);
+				}
+				t = this->peer_cfg->get_over_time(this->peer_cfg);
+				if (this->stats[STAT_REKEY] || this->stats[STAT_REAUTH])
+				{
+					if (this->stats[STAT_REAUTH] == 0)
+					{
+						this->stats[STAT_DELETE] = this->stats[STAT_REKEY];
+					}
+					else if (this->stats[STAT_REKEY] == 0)
+					{
+						this->stats[STAT_DELETE] = this->stats[STAT_REAUTH];
+					}
+					else
+					{
+						this->stats[STAT_DELETE] = min(this->stats[STAT_REKEY],
+													   this->stats[STAT_REAUTH]);
+					}
+					this->stats[STAT_DELETE] += t;
+					t = this->stats[STAT_DELETE] - this->stats[STAT_ESTABLISHED];
+					job = (job_t*)delete_ike_sa_job_create(this->ike_sa_id, TRUE);
+					charon->scheduler->schedule_job(charon->scheduler, job, t);
+					DBG1(DBG_IKE, "maximum IKE_SA lifetime %ds", t);
+				}
+
+				/* start DPD checks */
+				send_dpd(this);
+			}
+			break;
+		}
+		case IKE_DELETING:
+		{
+			/* delete may fail if a packet gets lost, so set a timeout */
+			job_t *job = (job_t*)delete_ike_sa_job_create(this->ike_sa_id, TRUE);
+			charon->scheduler->schedule_job(charon->scheduler, job,
+											HALF_OPEN_IKE_SA_TIMEOUT);
+			break;
+		}
+		default:
+			break;
+	}
+	charon->bus->ike_state_change(charon->bus, &this->public, state);
+	this->state = state;
+}
+
+/**
+ * Implementation of ike_sa_t.reset
+ */
+static void reset(private_ike_sa_t *this)
+{
+	/*  the responder ID is reset, as peer may choose another one */
+	if (this->ike_sa_id->is_initiator(this->ike_sa_id))
+	{
+		this->ike_sa_id->set_responder_spi(this->ike_sa_id, 0);
+	}
+
+	set_state(this, IKE_CREATED);
+
+	this->task_manager->reset(this->task_manager, 0, 0);
+}
+
+/**
+ * Implementation of ike_sa_t.get_keymat
+ */
+static keymat_t* get_keymat(private_ike_sa_t *this)
+{
+	return this->keymat;
+}
+
+/**
+ * Implementation of ike_sa_t.set_virtual_ip
+ */
+static void set_virtual_ip(private_ike_sa_t *this, bool local, host_t *ip)
+{
+	if (local)
+	{
+		DBG1(DBG_IKE, "installing new virtual IP %H", ip);
+		if (charon->kernel_interface->add_ip(charon->kernel_interface, ip,
+											 this->my_host) == SUCCESS)
+		{
+			if (this->my_virtual_ip)
+			{
+				DBG1(DBG_IKE, "removing old virtual IP %H", this->my_virtual_ip);
+				charon->kernel_interface->del_ip(charon->kernel_interface,
+												 this->my_virtual_ip);
+			}
+			DESTROY_IF(this->my_virtual_ip);
+			this->my_virtual_ip = ip->clone(ip);
+		}
+		else
+		{
+			DBG1(DBG_IKE, "installing virtual IP %H failed", ip);
+			this->my_virtual_ip = NULL;
+		}
+	}
+	else
+	{
+		DESTROY_IF(this->other_virtual_ip);
+		this->other_virtual_ip = ip->clone(ip);
+	}
+}
+
+/**
+ * Implementation of ike_sa_t.get_virtual_ip
+ */
+static host_t* get_virtual_ip(private_ike_sa_t *this, bool local)
+{
+	if (local)
+	{
+		return this->my_virtual_ip;
+	}
+	else
+	{
+		return this->other_virtual_ip;
+	}
+}
+
+/**
+ * Implementation of ike_sa_t.add_additional_address.
+ */
+static void add_additional_address(private_ike_sa_t *this, host_t *host)
+{
+	this->additional_addresses->insert_last(this->additional_addresses, host);
+}
+
+/**
+ * Implementation of ike_sa_t.create_additional_address_iterator.
+ */
+static iterator_t* create_additional_address_iterator(private_ike_sa_t *this)
+{
+	return this->additional_addresses->create_iterator(
+											this->additional_addresses, TRUE);
+}
+
+/**
+ * Implementation of ike_sa_t.has_mapping_changed
+ */
+static bool has_mapping_changed(private_ike_sa_t *this, chunk_t hash)
+{
+	if (this->nat_detection_dest.ptr == NULL)
+	{
+		this->nat_detection_dest = chunk_clone(hash);
+		return FALSE;
+	}
+	if (chunk_equals(hash, this->nat_detection_dest))
+	{
+		return FALSE;
+	}
+	free(this->nat_detection_dest.ptr);
+	this->nat_detection_dest = chunk_clone(hash);
+	return TRUE;
+}
+
+/**
+ * Implementation of ike_sa_t.set_pending_updates.
+ */
+static void set_pending_updates(private_ike_sa_t *this, u_int32_t updates)
+{
+	this->pending_updates = updates;
+}
+
+/**
+ * Implementation of ike_sa_t.get_pending_updates.
+ */
+static u_int32_t get_pending_updates(private_ike_sa_t *this)
+{
+	return this->pending_updates;
+}
+
+/**
+ * Update hosts, as addresses may change (NAT)
+ */
+static void update_hosts(private_ike_sa_t *this, host_t *me, host_t *other)
+{
+	bool update = FALSE;
+
+	if (me == NULL)
+	{
+		me = this->my_host;
+	}
+	if (other == NULL)
+	{
+		other = this->other_host;
+	}
+
+	/* apply hosts on first received message */
+	if (this->my_host->is_anyaddr(this->my_host) ||
+		this->other_host->is_anyaddr(this->other_host))
+	{
+		set_my_host(this, me->clone(me));
+		set_other_host(this, other->clone(other));
+		update = TRUE;
+	}
+	else
+	{
+		/* update our address in any case */
+		if (!me->equals(me, this->my_host))
+		{
+			set_my_host(this, me->clone(me));
+			update = TRUE;
+		}
+
+		if (!other->equals(other, this->other_host))
+		{
+			/* update others adress if we are NOT NATed,
+			 * and allow port changes if we are NATed */
+			if (!has_condition(this, COND_NAT_HERE) ||
+				other->ip_equals(other, this->other_host))
+			{
+				set_other_host(this, other->clone(other));
+				update = TRUE;
+			}
+		}
+	}
+
+	/* update all associated CHILD_SAs, if required */
+	if (update)
+	{
+		iterator_t *iterator;
+		child_sa_t *child_sa;
+
+		iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
+		while (iterator->iterate(iterator, (void**)&child_sa))
+		{
+			if (child_sa->update(child_sa, this->my_host,
+						this->other_host, this->my_virtual_ip,
+						has_condition(this, COND_NAT_ANY)) == NOT_SUPPORTED)
+			{
+				this->public.rekey_child_sa(&this->public,
+						child_sa->get_protocol(child_sa),
+						child_sa->get_spi(child_sa, TRUE));
+			}
+		}
+		iterator->destroy(iterator);
+	}
+}
+
+/**
+ * Implementation of ike_sa_t.generate
+ */
+static status_t generate_message(private_ike_sa_t *this, message_t *message,
+								 packet_t **packet)
+{
+	this->stats[STAT_OUTBOUND] = time_monotonic(NULL);
+	message->set_ike_sa_id(message, this->ike_sa_id);
+	return message->generate(message,
+				this->keymat->get_crypter(this->keymat, FALSE),
+				this->keymat->get_signer(this->keymat, FALSE), packet);
+}
+
+/**
+ * send a notify back to the sender
+ */
+static void send_notify_response(private_ike_sa_t *this, message_t *request,
+								 notify_type_t type)
+{
+	message_t *response;
+	packet_t *packet;
+
+	response = message_create();
+	response->set_exchange_type(response, request->get_exchange_type(request));
+	response->set_request(response, FALSE);
+	response->set_message_id(response, request->get_message_id(request));
+	response->add_notify(response, FALSE, type, chunk_empty);
+	if (this->my_host->is_anyaddr(this->my_host))
+	{
+		this->my_host->destroy(this->my_host);
+		this->my_host = request->get_destination(request);
+		this->my_host = this->my_host->clone(this->my_host);
+	}
+	if (this->other_host->is_anyaddr(this->other_host))
+	{
+		this->other_host->destroy(this->other_host);
+		this->other_host = request->get_source(request);
+		this->other_host = this->other_host->clone(this->other_host);
+	}
+	response->set_source(response, this->my_host->clone(this->my_host));
+	response->set_destination(response, this->other_host->clone(this->other_host));
+	if (generate_message(this, response, &packet) == SUCCESS)
+	{
+		charon->sender->send(charon->sender, packet);
+	}
+	response->destroy(response);
+}
+
+/**
+ * Implementation of ike_sa_t.set_kmaddress.
+ */
+static void set_kmaddress(private_ike_sa_t *this, host_t *local, host_t *remote)
+{
+	DESTROY_IF(this->local_host);
+	DESTROY_IF(this->remote_host);
+	this->local_host = local->clone(local);
+	this->remote_host = remote->clone(remote);
+}
+
+#ifdef ME
+/**
+ * Implementation of ike_sa_t.act_as_mediation_server.
+ */
+static void act_as_mediation_server(private_ike_sa_t *this)
+{
+	charon->mediation_manager->update_sa_id(charon->mediation_manager,
+			this->other_id, this->ike_sa_id);
+	this->is_mediation_server = TRUE;
+}
+
+/**
+ * Implementation of ike_sa_t.get_server_reflexive_host.
+ */
+static host_t *get_server_reflexive_host(private_ike_sa_t *this)
+{
+	return this->server_reflexive_host;
+}
+
+/**
+ * Implementation of ike_sa_t.set_server_reflexive_host.
+ */
+static void set_server_reflexive_host(private_ike_sa_t *this, host_t *host)
+{
+	DESTROY_IF(this->server_reflexive_host);
+	this->server_reflexive_host = host;
+}
+
+/**
+ * Implementation of ike_sa_t.get_connect_id.
+ */
+static chunk_t get_connect_id(private_ike_sa_t *this)
+{
+	return this->connect_id;
+}
+
+/**
+ * Implementation of ike_sa_t.respond
+ */
+static status_t respond(private_ike_sa_t *this, identification_t *peer_id,
+						chunk_t connect_id)
+{
+	ike_me_t *task = ike_me_create(&this->public, TRUE);
+	task->respond(task, peer_id, connect_id);
+	this->task_manager->queue_task(this->task_manager, (task_t*)task);
+	return this->task_manager->initiate(this->task_manager);
+}
+
+/**
+ * Implementation of ike_sa_t.callback
+ */
+static status_t callback(private_ike_sa_t *this, identification_t *peer_id)
+{
+	ike_me_t *task = ike_me_create(&this->public, TRUE);
+	task->callback(task, peer_id);
+	this->task_manager->queue_task(this->task_manager, (task_t*)task);
+	return this->task_manager->initiate(this->task_manager);
+}
+
+/**
+ * Implementation of ike_sa_t.relay
+ */
+static status_t relay(private_ike_sa_t *this, identification_t *requester,
+					  chunk_t connect_id, chunk_t connect_key,
+					  linked_list_t *endpoints, bool response)
+{
+	ike_me_t *task = ike_me_create(&this->public, TRUE);
+	task->relay(task, requester, connect_id, connect_key, endpoints, response);
+	this->task_manager->queue_task(this->task_manager, (task_t*)task);
+	return this->task_manager->initiate(this->task_manager);
+}
+
+/**
+ * Implementation of ike_sa_t.initiate_mediation
+ */
+static status_t initiate_mediation(private_ike_sa_t *this,
+								   peer_cfg_t *mediated_cfg)
+{
+	ike_me_t *task = ike_me_create(&this->public, TRUE);
+	task->connect(task, mediated_cfg->get_peer_id(mediated_cfg));
+	this->task_manager->queue_task(this->task_manager, (task_t*)task);
+	return this->task_manager->initiate(this->task_manager);
+}
+
+/**
+ * Implementation of ike_sa_t.initiate_mediated
+ */
+static status_t initiate_mediated(private_ike_sa_t *this, host_t *me,
+								  host_t *other, chunk_t connect_id)
+{
+	set_my_host(this, me->clone(me));
+	set_other_host(this, other->clone(other));
+	chunk_free(&this->connect_id);
+	this->connect_id = chunk_clone(connect_id);
+	return this->task_manager->initiate(this->task_manager);
+}
+#endif /* ME */
+
+/**
+ * Resolve DNS host in configuration
+ */
+static void resolve_hosts(private_ike_sa_t *this)
+{
+	host_t *host;
+
+	if (this->remote_host)
+	{
+		host = this->remote_host->clone(this->remote_host);
+		host->set_port(host, IKEV2_UDP_PORT);
+	}
+	else
+	{
+		host = host_create_from_dns(this->ike_cfg->get_other_addr(this->ike_cfg),
+								0, this->ike_cfg->get_other_port(this->ike_cfg));
+	}
+	if (host)
+	{
+		set_other_host(this, host);
+	}
+
+	if (this->local_host)
+	{
+		host = this->local_host->clone(this->local_host);
+		host->set_port(host, IKEV2_UDP_PORT);
+	}
+	else
+	{
+		int family = 0;
+
+		/* use same address family as for other */
+		if (!this->other_host->is_anyaddr(this->other_host))
+		{
+			family = this->other_host->get_family(this->other_host);
+		}
+		host = host_create_from_dns(this->ike_cfg->get_my_addr(this->ike_cfg),
+							family, this->ike_cfg->get_my_port(this->ike_cfg));
+
+		if (host && host->is_anyaddr(host) &&
+			!this->other_host->is_anyaddr(this->other_host))
+		{
+			host->destroy(host);
+			host = charon->kernel_interface->get_source_addr(
+							charon->kernel_interface, this->other_host, NULL);
+			if (host)
+			{
+				host->set_port(host, this->ike_cfg->get_my_port(this->ike_cfg));
+			}
+			else
+			{	/* fallback to address family specific %any(6), if configured */
+				host = host_create_from_dns(
+								this->ike_cfg->get_my_addr(this->ike_cfg),
+								0, this->ike_cfg->get_my_port(this->ike_cfg));
+			}
+		}
+	}
+	if (host)
+	{
+		set_my_host(this, host);
+	}
+}
+
+/**
+ * Implementation of ike_sa_t.initiate
+ */
+static status_t initiate(private_ike_sa_t *this,
+						 child_cfg_t *child_cfg, u_int32_t reqid,
+						 traffic_selector_t *tsi, traffic_selector_t *tsr)
+{
+	task_t *task;
+
+	if (this->state == IKE_CREATED)
+	{
+		resolve_hosts(this);
+
+		if (this->other_host->is_anyaddr(this->other_host)
+#ifdef ME
+			&& !this->peer_cfg->get_mediated_by(this->peer_cfg)
+#endif /* ME */
+			)
+		{
+			child_cfg->destroy(child_cfg);
+			DBG1(DBG_IKE, "unable to initiate to %%any");
+			return DESTROY_ME;
+		}
+
+		set_condition(this, COND_ORIGINAL_INITIATOR, TRUE);
+
+		task = (task_t*)ike_vendor_create(&this->public, TRUE);
+		this->task_manager->queue_task(this->task_manager, task);
+		task = (task_t*)ike_init_create(&this->public, TRUE, NULL);
+		this->task_manager->queue_task(this->task_manager, task);
+		task = (task_t*)ike_natd_create(&this->public, TRUE);
+		this->task_manager->queue_task(this->task_manager, task);
+		task = (task_t*)ike_cert_pre_create(&this->public, TRUE);
+		this->task_manager->queue_task(this->task_manager, task);
+		task = (task_t*)ike_auth_create(&this->public, TRUE);
+		this->task_manager->queue_task(this->task_manager, task);
+		task = (task_t*)ike_cert_post_create(&this->public, TRUE);
+		this->task_manager->queue_task(this->task_manager, task);
+		task = (task_t*)ike_config_create(&this->public, TRUE);
+		this->task_manager->queue_task(this->task_manager, task);
+		task = (task_t*)ike_auth_lifetime_create(&this->public, TRUE);
+		this->task_manager->queue_task(this->task_manager, task);
+		if (this->peer_cfg->use_mobike(this->peer_cfg))
+		{
+			task = (task_t*)ike_mobike_create(&this->public, TRUE);
+			this->task_manager->queue_task(this->task_manager, task);
+		}
+#ifdef ME
+		task = (task_t*)ike_me_create(&this->public, TRUE);
+		this->task_manager->queue_task(this->task_manager, task);
+#endif /* ME */
+	}
+
+#ifdef ME
+	if (this->peer_cfg->is_mediation(this->peer_cfg))
+	{
+		if (this->state == IKE_ESTABLISHED)
+		{
+			/* mediation connection is already established, retrigger state
+			 * change to notify bus listeners */
+			DBG1(DBG_IKE, "mediation connection is already up");
+			set_state(this, IKE_ESTABLISHED);
+		}
+		DESTROY_IF(child_cfg);
+	}
+	else
+#endif /* ME */
+	{
+		/* normal IKE_SA with CHILD_SA */
+		task = (task_t*)child_create_create(&this->public, child_cfg, FALSE,
+											tsi, tsr);
+		child_cfg->destroy(child_cfg);
+		if (reqid)
+		{
+			child_create_t *child_create = (child_create_t*)task;
+			child_create->use_reqid(child_create, reqid);
+		}
+		this->task_manager->queue_task(this->task_manager, task);
+
+#ifdef ME
+		if (this->peer_cfg->get_mediated_by(this->peer_cfg))
+		{
+			/* mediated connection, initiate mediation process */
+			job_t *job = (job_t*)initiate_mediation_job_create(this->ike_sa_id);
+			charon->processor->queue_job(charon->processor, job);
+			return SUCCESS;
+		}
+#endif /* ME */
+	}
+
+	return this->task_manager->initiate(this->task_manager);
+}
+
+/**
+ * Implementation of ike_sa_t.process_message.
+ */
+static status_t process_message(private_ike_sa_t *this, message_t *message)
+{
+	status_t status;
+	bool is_request;
+
+	if (this->state == IKE_PASSIVE)
+	{	/* do not handle messages in passive state */
+		return FAILED;
+	}
+
+	is_request = message->get_request(message);
+
+	status = message->parse_body(message,
+								 this->keymat->get_crypter(this->keymat, TRUE),
+								 this->keymat->get_signer(this->keymat, TRUE));
+	if (status != SUCCESS)
+	{
+
+		if (is_request)
+		{
+			switch (status)
+			{
+				case NOT_SUPPORTED:
+					DBG1(DBG_IKE, "critical unknown payloads found");
+					if (is_request)
+					{
+						send_notify_response(this, message, UNSUPPORTED_CRITICAL_PAYLOAD);
+					}
+					break;
+				case PARSE_ERROR:
+					DBG1(DBG_IKE, "message parsing failed");
+					if (is_request)
+					{
+						send_notify_response(this, message, INVALID_SYNTAX);
+					}
+					break;
+				case VERIFY_ERROR:
+					DBG1(DBG_IKE, "message verification failed");
+					if (is_request)
+					{
+						send_notify_response(this, message, INVALID_SYNTAX);
+					}
+					break;
+				case FAILED:
+					DBG1(DBG_IKE, "integrity check failed");
+					/* ignored */
+					break;
+				case INVALID_STATE:
+					DBG1(DBG_IKE, "found encrypted message, but no keys available");
+					if (is_request)
+					{
+						send_notify_response(this, message, INVALID_SYNTAX);
+					}
+				default:
+					break;
+			}
+		}
+		DBG1(DBG_IKE, "%N %s with message ID %d processing failed",
+			 exchange_type_names, message->get_exchange_type(message),
+			 message->get_request(message) ? "request" : "response",
+			 message->get_message_id(message));
+
+		if (this->state == IKE_CREATED)
+		{	/* invalid initiation attempt, close SA */
+			return DESTROY_ME;
+		}
+	}
+	else
+	{
+		host_t *me, *other;
+
+		me = message->get_destination(message);
+		other = message->get_source(message);
+
+		/* if this IKE_SA is virgin, we check for a config */
+		if (this->ike_cfg == NULL)
+		{
+			job_t *job;
+			this->ike_cfg = charon->backends->get_ike_cfg(charon->backends,
+														  me, other);
+			if (this->ike_cfg == NULL)
+			{
+				/* no config found for these hosts, destroy */
+				DBG1(DBG_IKE, "no IKE config found for %H...%H, sending %N",
+					 me, other, notify_type_names, NO_PROPOSAL_CHOSEN);
+				send_notify_response(this, message, NO_PROPOSAL_CHOSEN);
+				return DESTROY_ME;
+			}
+			/* add a timeout if peer does not establish it completely */
+			job = (job_t*)delete_ike_sa_job_create(this->ike_sa_id, FALSE);
+			charon->scheduler->schedule_job(charon->scheduler, job,
+											HALF_OPEN_IKE_SA_TIMEOUT);
+		}
+		this->stats[STAT_INBOUND] = time_monotonic(NULL);
+		/* check if message is trustworthy, and update host information */
+		if (this->state == IKE_CREATED || this->state == IKE_CONNECTING ||
+			message->get_exchange_type(message) != IKE_SA_INIT)
+		{
+			if (!supports_extension(this, EXT_MOBIKE))
+			{	/* with MOBIKE, we do no implicit updates */
+				update_hosts(this, me, other);
+			}
+		}
+		status = this->task_manager->process_message(this->task_manager, message);
+		if (message->get_exchange_type(message) == IKE_AUTH &&
+			this->state == IKE_ESTABLISHED)
+		{	/* authentication completed */
+			flush_auth_cfgs(this);
+		}
+	}
+	return status;
+}
+
+/**
+ * Implementation of ike_sa_t.get_id.
+ */
+static ike_sa_id_t* get_id(private_ike_sa_t *this)
+{
+	return this->ike_sa_id;
+}
+
+/**
+ * Implementation of ike_sa_t.get_my_id.
+ */
+static identification_t* get_my_id(private_ike_sa_t *this)
+{
+	return this->my_id;
+}
+
+/**
+ * Implementation of ike_sa_t.set_my_id.
+ */
+static void set_my_id(private_ike_sa_t *this, identification_t *me)
+{
+	DESTROY_IF(this->my_id);
+	this->my_id = me;
+}
+
+/**
+ * Implementation of ike_sa_t.get_other_id.
+ */
+static identification_t* get_other_id(private_ike_sa_t *this)
+{
+	return this->other_id;
+}
+
+/**
+ * Implementation of ike_sa_t.get_other_eap_id.
+ */
+static identification_t* get_other_eap_id(private_ike_sa_t *this)
+{
+	identification_t *id = NULL, *current;
+	enumerator_t *enumerator;
+	auth_cfg_t *cfg;
+
+	enumerator = this->other_auths->create_enumerator(this->other_auths);
+	while (enumerator->enumerate(enumerator, &cfg))
+	{
+		/* prefer EAP-Identity of last round */
+		current = cfg->get(cfg, AUTH_RULE_EAP_IDENTITY);
+		if (!current || current->get_type(current) == ID_ANY)
+		{
+			current = cfg->get(cfg, AUTH_RULE_IDENTITY);
+		}
+		if (current && current->get_type(current) != ID_ANY)
+		{
+			id = current;
+			continue;
+		}
+	}
+	enumerator->destroy(enumerator);
+	if (id)
+	{
+		return id;
+	}
+	return this->other_id;
+}
+
+/**
+ * Implementation of ike_sa_t.set_other_id.
+ */
+static void set_other_id(private_ike_sa_t *this, identification_t *other)
+{
+	DESTROY_IF(this->other_id);
+	this->other_id = other;
+}
+
+/**
+ * Implementation of ike_sa_t.add_child_sa.
+ */
+static void add_child_sa(private_ike_sa_t *this, child_sa_t *child_sa)
+{
+	this->child_sas->insert_last(this->child_sas, child_sa);
+}
+
+/**
+ * Implementation of ike_sa_t.get_child_sa.
+ */
+static child_sa_t* get_child_sa(private_ike_sa_t *this, protocol_id_t protocol,
+								u_int32_t spi, bool inbound)
+{
+	iterator_t *iterator;
+	child_sa_t *current, *found = NULL;
+
+	iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (current->get_spi(current, inbound) == spi &&
+			current->get_protocol(current) == protocol)
+		{
+			found = current;
+		}
+	}
+	iterator->destroy(iterator);
+	return found;
+}
+
+/**
+ * Implementation of ike_sa_t.create_child_sa_iterator.
+ */
+static iterator_t* create_child_sa_iterator(private_ike_sa_t *this)
+{
+	return this->child_sas->create_iterator(this->child_sas, TRUE);
+}
+
+/**
+ * Implementation of ike_sa_t.rekey_child_sa.
+ */
+static status_t rekey_child_sa(private_ike_sa_t *this, protocol_id_t protocol,
+							   u_int32_t spi)
+{
+	child_rekey_t *child_rekey;
+
+	child_rekey = child_rekey_create(&this->public, protocol, spi);
+	this->task_manager->queue_task(this->task_manager, &child_rekey->task);
+	return this->task_manager->initiate(this->task_manager);
+}
+
+/**
+ * Implementation of ike_sa_t.delete_child_sa.
+ */
+static status_t delete_child_sa(private_ike_sa_t *this, protocol_id_t protocol,
+								u_int32_t spi)
+{
+	child_delete_t *child_delete;
+
+	child_delete = child_delete_create(&this->public, protocol, spi);
+	this->task_manager->queue_task(this->task_manager, &child_delete->task);
+	return this->task_manager->initiate(this->task_manager);
+}
+
+/**
+ * Implementation of ike_sa_t.destroy_child_sa.
+ */
+static status_t destroy_child_sa(private_ike_sa_t *this, protocol_id_t protocol,
+								 u_int32_t spi)
+{
+	iterator_t *iterator;
+	child_sa_t *child_sa;
+	status_t status = NOT_FOUND;
+
+	iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
+	while (iterator->iterate(iterator, (void**)&child_sa))
+	{
+		if (child_sa->get_protocol(child_sa) == protocol &&
+			child_sa->get_spi(child_sa, TRUE) == spi)
+		{
+			child_sa->destroy(child_sa);
+			iterator->remove(iterator);
+			status = SUCCESS;
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+	return status;
+}
+
+/**
+ * Implementation of public_ike_sa_t.delete.
+ */
+static status_t delete_(private_ike_sa_t *this)
+{
+	ike_delete_t *ike_delete;
+
+	switch (this->state)
+	{
+		case IKE_ESTABLISHED:
+		case IKE_REKEYING:
+			ike_delete = ike_delete_create(&this->public, TRUE);
+			this->task_manager->queue_task(this->task_manager, &ike_delete->task);
+			return this->task_manager->initiate(this->task_manager);
+		case IKE_CREATED:
+			DBG1(DBG_IKE, "deleting unestablished IKE_SA");
+			break;
+		case IKE_PASSIVE:
+			break;
+		default:
+			DBG1(DBG_IKE, "destroying IKE_SA in state %N "
+				"without notification", ike_sa_state_names, this->state);
+			charon->bus->ike_updown(charon->bus, &this->public, FALSE);
+			break;
+	}
+	return DESTROY_ME;
+}
+
+/**
+ * Implementation of ike_sa_t.rekey.
+ */
+static status_t rekey(private_ike_sa_t *this)
+{
+	ike_rekey_t *ike_rekey;
+
+	ike_rekey = ike_rekey_create(&this->public, TRUE);
+
+	this->task_manager->queue_task(this->task_manager, &ike_rekey->task);
+	return this->task_manager->initiate(this->task_manager);
+}
+
+/**
+ * Implementation of ike_sa_t.reauth
+ */
+static status_t reauth(private_ike_sa_t *this)
+{
+	task_t *task;
+
+	/* we can't reauthenticate as responder when we use EAP or virtual IPs.
+	 * If the peer does not support RFC4478, there is no way to keep the
+	 * IKE_SA up. */
+	if (!has_condition(this, COND_ORIGINAL_INITIATOR))
+	{
+		DBG1(DBG_IKE, "initiator did not reauthenticate as requested");
+		if (this->other_virtual_ip != NULL ||
+			has_condition(this, COND_EAP_AUTHENTICATED)
+#ifdef ME
+			/* as mediation server we too cannot reauth the IKE_SA */
+			|| this->is_mediation_server
+#endif /* ME */
+			)
+		{
+			time_t now = time_monotonic(NULL);
+
+			DBG1(DBG_IKE, "IKE_SA will timeout in %V",
+				 &now, &this->stats[STAT_DELETE]);
+			return FAILED;
+		}
+		else
+		{
+			DBG1(DBG_IKE, "reauthenticating actively");
+		}
+	}
+	task = (task_t*)ike_reauth_create(&this->public);
+	this->task_manager->queue_task(this->task_manager, task);
+
+	return this->task_manager->initiate(this->task_manager);
+}
+
+/**
+ * Implementation of ike_sa_t.reestablish
+ */
+static status_t reestablish(private_ike_sa_t *this)
+{
+	ike_sa_t *new;
+	host_t *host;
+	action_t action;
+	iterator_t *iterator;
+	child_sa_t *child_sa;
+	child_cfg_t *child_cfg;
+	bool restart = FALSE;
+	status_t status = FAILED;
+
+	/* check if we have children to keep up at all */
+	iterator = create_child_sa_iterator(this);
+	while (iterator->iterate(iterator, (void**)&child_sa))
+	{
+		child_cfg = child_sa->get_config(child_sa);
+		if (this->state == IKE_DELETING)
+		{
+			action = child_cfg->get_close_action(child_cfg);
+		}
+		else
+		{
+			action = child_cfg->get_dpd_action(child_cfg);
+		}
+		switch (action)
+		{
+			case ACTION_RESTART:
+				restart = TRUE;
+				break;
+			case ACTION_ROUTE:
+				charon->traps->install(charon->traps, this->peer_cfg, child_cfg);
+				break;
+			default:
+				break;
+		}
+	}
+	iterator->destroy(iterator);
+#ifdef ME
+	/* mediation connections have no children, keep them up anyway */
+	if (this->peer_cfg->is_mediation(this->peer_cfg))
+	{
+		restart = TRUE;
+	}
+#endif /* ME */
+	if (!restart)
+	{
+		return FAILED;
+	}
+
+	/* check if we are able to reestablish this IKE_SA */
+	if (!has_condition(this, COND_ORIGINAL_INITIATOR) &&
+		(this->other_virtual_ip != NULL ||
+		 has_condition(this, COND_EAP_AUTHENTICATED)
+#ifdef ME
+		 || this->is_mediation_server
+#endif /* ME */
+		))
+	{
+		DBG1(DBG_IKE, "unable to reestablish IKE_SA due asymetric setup");
+		return FAILED;
+	}
+
+	new = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager, TRUE);
+	new->set_peer_cfg(new, this->peer_cfg);
+	host = this->other_host;
+	new->set_other_host(new, host->clone(host));
+	host = this->my_host;
+	new->set_my_host(new, host->clone(host));
+	/* if we already have a virtual IP, we reuse it */
+	host = this->my_virtual_ip;
+	if (host)
+	{
+		new->set_virtual_ip(new, TRUE, host);
+	}
+
+#ifdef ME
+	if (this->peer_cfg->is_mediation(this->peer_cfg))
+	{
+		status = new->initiate(new, NULL, 0, NULL, NULL);
+	}
+	else
+#endif /* ME */
+	{
+		iterator = create_child_sa_iterator(this);
+		while (iterator->iterate(iterator, (void**)&child_sa))
+		{
+			child_cfg = child_sa->get_config(child_sa);
+			if (this->state == IKE_DELETING)
+			{
+				action = child_cfg->get_close_action(child_cfg);
+			}
+			else
+			{
+				action = child_cfg->get_dpd_action(child_cfg);
+			}
+			switch (action)
+			{
+				case ACTION_RESTART:
+					DBG1(DBG_IKE, "restarting CHILD_SA %s",
+						 child_cfg->get_name(child_cfg));
+					child_cfg->get_ref(child_cfg);
+					status = new->initiate(new, child_cfg, 0, NULL, NULL);
+					break;
+				default:
+					continue;
+			}
+			if (status == DESTROY_ME)
+			{
+				break;
+			}
+		}
+		iterator->destroy(iterator);
+	}
+
+	if (status == DESTROY_ME)
+	{
+		charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager, new);
+		status = FAILED;
+	}
+	else
+	{
+		charon->ike_sa_manager->checkin(charon->ike_sa_manager, new);
+		status = SUCCESS;
+	}
+	charon->bus->set_sa(charon->bus, &this->public);
+	return status;
+}
+
+/**
+ * Implementation of ike_sa_t.retransmit.
+ */
+static status_t retransmit(private_ike_sa_t *this, u_int32_t message_id)
+{
+	this->stats[STAT_OUTBOUND] = time_monotonic(NULL);
+	if (this->task_manager->retransmit(this->task_manager, message_id) != SUCCESS)
+	{
+		/* send a proper signal to brief interested bus listeners */
+		switch (this->state)
+		{
+			case IKE_CONNECTING:
+			{
+				/* retry IKE_SA_INIT if we have multiple keyingtries */
+				u_int32_t tries = this->peer_cfg->get_keyingtries(this->peer_cfg);
+				this->keyingtry++;
+				if (tries == 0 || tries > this->keyingtry)
+				{
+					DBG1(DBG_IKE, "peer not responding, trying again (%d/%d)",
+						 this->keyingtry + 1, tries);
+					reset(this);
+					return this->task_manager->initiate(this->task_manager);
+				}
+				DBG1(DBG_IKE, "establishing IKE_SA failed, peer not responding");
+				break;
+			}
+			case IKE_DELETING:
+				DBG1(DBG_IKE, "proper IKE_SA delete failed, peer not responding");
+				break;
+			case IKE_REKEYING:
+				DBG1(DBG_IKE, "rekeying IKE_SA failed, peer not responding");
+				/* FALL */
+			default:
+				reestablish(this);
+				break;
+		}
+		return DESTROY_ME;
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of ike_sa_t.set_auth_lifetime.
+ */
+static void set_auth_lifetime(private_ike_sa_t *this, u_int32_t lifetime)
+{
+	u_int32_t reduction = this->peer_cfg->get_over_time(this->peer_cfg);
+	u_int32_t reauth_time = time_monotonic(NULL) + lifetime - reduction;
+
+	if (lifetime < reduction)
+	{
+		DBG1(DBG_IKE, "received AUTH_LIFETIME of %ds, starting reauthentication",
+			 lifetime);
+		charon->processor->queue_job(charon->processor,
+					(job_t*)rekey_ike_sa_job_create(this->ike_sa_id, TRUE));
+	}
+	else if (this->stats[STAT_REAUTH] == 0 ||
+			 this->stats[STAT_REAUTH] > reauth_time)
+	{
+		this->stats[STAT_REAUTH] = reauth_time;
+		DBG1(DBG_IKE, "received AUTH_LIFETIME of %ds, scheduling reauthentication"
+			 " in %ds", lifetime, lifetime - reduction);
+		charon->scheduler->schedule_job(charon->scheduler,
+						(job_t*)rekey_ike_sa_job_create(this->ike_sa_id, TRUE),
+						lifetime - reduction);
+	}
+	else
+	{
+		DBG1(DBG_IKE, "received AUTH_LIFETIME of %ds, "
+			 "reauthentication already scheduled in %ds", lifetime,
+			 this->stats[STAT_REAUTH] - time_monotonic(NULL));
+	}
+}
+
+/**
+ * Implementation of ike_sa_t.roam.
+ */
+static status_t roam(private_ike_sa_t *this, bool address)
+{
+	host_t *src;
+	ike_mobike_t *mobike;
+
+	switch (this->state)
+	{
+		case IKE_CREATED:
+		case IKE_DELETING:
+		case IKE_DESTROYING:
+		case IKE_PASSIVE:
+			return SUCCESS;
+		default:
+			break;
+	}
+	/* responder just updates the peer about changed address config */
+	if (!this->ike_sa_id->is_initiator(this->ike_sa_id))
+	{
+		if (supports_extension(this, EXT_MOBIKE) && address)
+		{
+			DBG1(DBG_IKE, "sending address list update using MOBIKE");
+			mobike = ike_mobike_create(&this->public, TRUE);
+			this->task_manager->queue_task(this->task_manager, (task_t*)mobike);
+			return this->task_manager->initiate(this->task_manager);
+		}
+		return SUCCESS;
+	}
+
+	/* keep existing path if possible */
+	src = charon->kernel_interface->get_source_addr(charon->kernel_interface,
+											this->other_host, this->my_host);
+	if (src)
+	{
+		if (src->ip_equals(src, this->my_host))
+		{
+			DBG2(DBG_IKE, "keeping connection path %H - %H",
+				 src, this->other_host);
+			src->destroy(src);
+			set_condition(this, COND_STALE, FALSE);
+			return SUCCESS;
+		}
+		src->destroy(src);
+
+	}
+	else
+	{
+		/* check if we find a route at all */
+		enumerator_t *enumerator;
+		host_t *addr;
+
+		src = charon->kernel_interface->get_source_addr(charon->kernel_interface,
+														this->other_host, NULL);
+		if (!src)
+		{
+			enumerator = this->additional_addresses->create_enumerator(
+													this->additional_addresses);
+			while (enumerator->enumerate(enumerator, &addr))
+			{
+				DBG1(DBG_IKE, "looking for a route to %H ...", addr);
+				src = charon->kernel_interface->get_source_addr(
+										charon->kernel_interface, addr, NULL);
+				if (src)
+				{
+					break;
+				}
+			}
+			enumerator->destroy(enumerator);
+		}
+		if (!src)
+		{
+			DBG1(DBG_IKE, "no route found to reach %H, MOBIKE update deferred",
+				 this->other_host);
+			set_condition(this, COND_STALE, TRUE);
+			return SUCCESS;
+		}
+		src->destroy(src);
+	}
+	set_condition(this, COND_STALE, FALSE);
+
+	/* update addresses with mobike, if supported ... */
+	if (supports_extension(this, EXT_MOBIKE))
+	{
+		DBG1(DBG_IKE, "requesting address change using MOBIKE");
+		mobike = ike_mobike_create(&this->public, TRUE);
+		mobike->roam(mobike, address);
+		this->task_manager->queue_task(this->task_manager, (task_t*)mobike);
+		return this->task_manager->initiate(this->task_manager);
+	}
+	DBG1(DBG_IKE, "reauthenticating IKE_SA due to address change");
+	/* ... reauth if not */
+	return reauth(this);
+}
+
+/**
+ * Implementation of ike_sa_t.add_configuration_attribute
+ */
+static void add_configuration_attribute(private_ike_sa_t *this,
+							attribute_handler_t *handler,
+							configuration_attribute_type_t type, chunk_t data)
+{
+	attribute_entry_t *entry = malloc_thing(attribute_entry_t);
+
+	entry->handler = handler;
+	entry->type = type;
+	entry->data = chunk_clone(data);
+
+	this->attributes->insert_last(this->attributes, entry);
+}
+
+/**
+ * Implementation of ike_sa_t.inherit.
+ */
+static status_t inherit(private_ike_sa_t *this, private_ike_sa_t *other)
+{
+	child_sa_t *child_sa;
+	attribute_entry_t *entry;
+
+	/* apply hosts and ids */
+	this->my_host->destroy(this->my_host);
+	this->other_host->destroy(this->other_host);
+	this->my_id->destroy(this->my_id);
+	this->other_id->destroy(this->other_id);
+	this->my_host = other->my_host->clone(other->my_host);
+	this->other_host = other->other_host->clone(other->other_host);
+	this->my_id = other->my_id->clone(other->my_id);
+	this->other_id = other->other_id->clone(other->other_id);
+
+	/* apply virtual assigned IPs... */
+	if (other->my_virtual_ip)
+	{
+		this->my_virtual_ip = other->my_virtual_ip;
+		other->my_virtual_ip = NULL;
+	}
+	if (other->other_virtual_ip)
+	{
+		this->other_virtual_ip = other->other_virtual_ip;
+		other->other_virtual_ip = NULL;
+	}
+
+	/* ... and configuration attributes */
+	while (other->attributes->remove_last(other->attributes,
+										  (void**)&entry) == SUCCESS)
+	{
+		this->attributes->insert_first(this->attributes, entry);
+	}
+
+	/* inherit all conditions */
+	this->conditions = other->conditions;
+	if (this->conditions & COND_NAT_HERE)
+	{
+		send_keepalive(this);
+	}
+
+#ifdef ME
+	if (other->is_mediation_server)
+	{
+		act_as_mediation_server(this);
+	}
+	else if (other->server_reflexive_host)
+	{
+		this->server_reflexive_host = other->server_reflexive_host->clone(
+				other->server_reflexive_host);
+	}
+#endif /* ME */
+
+	/* adopt all children */
+	while (other->child_sas->remove_last(other->child_sas,
+										 (void**)&child_sa) == SUCCESS)
+	{
+		this->child_sas->insert_first(this->child_sas, (void*)child_sa);
+	}
+
+	/* move pending tasks to the new IKE_SA */
+	this->task_manager->adopt_tasks(this->task_manager, other->task_manager);
+
+	/* reauthentication timeout survives a rekeying */
+	if (other->stats[STAT_REAUTH])
+	{
+		time_t reauth, delete, now = time_monotonic(NULL);
+
+		this->stats[STAT_REAUTH] = other->stats[STAT_REAUTH];
+		reauth = this->stats[STAT_REAUTH] - now;
+		delete = reauth + this->peer_cfg->get_over_time(this->peer_cfg);
+		this->stats[STAT_DELETE] = this->stats[STAT_REAUTH] + delete;
+		DBG1(DBG_IKE, "rescheduling reauthentication in %ds after rekeying, "
+			 "lifetime reduced to %ds", reauth, delete);
+		charon->scheduler->schedule_job(charon->scheduler,
+				(job_t*)rekey_ike_sa_job_create(this->ike_sa_id, TRUE), reauth);
+		charon->scheduler->schedule_job(charon->scheduler,
+				(job_t*)delete_ike_sa_job_create(this->ike_sa_id, TRUE), delete);
+	}
+	/* we have to initate here, there may be new tasks to handle */
+	return this->task_manager->initiate(this->task_manager);
+}
+
+/**
+ * Implementation of ike_sa_t.destroy.
+ */
+static void destroy(private_ike_sa_t *this)
+{
+	attribute_entry_t *entry;
+
+	charon->bus->set_sa(charon->bus, &this->public);
+
+	set_state(this, IKE_DESTROYING);
+
+	/* remove attributes first, as we pass the IKE_SA to the handler */
+	while (this->attributes->remove_last(this->attributes,
+										 (void**)&entry) == SUCCESS)
+	{
+		hydra->attributes->release(hydra->attributes, entry->handler,
+								   this->other_id, entry->type, entry->data);
+		free(entry->data.ptr);
+		free(entry);
+	}
+	this->attributes->destroy(this->attributes);
+
+	this->child_sas->destroy_offset(this->child_sas, offsetof(child_sa_t, destroy));
+
+	/* unset SA after here to avoid usage by the listeners */
+	charon->bus->set_sa(charon->bus, NULL);
+
+	this->task_manager->destroy(this->task_manager);
+	this->keymat->destroy(this->keymat);
+
+	if (this->my_virtual_ip)
+	{
+		charon->kernel_interface->del_ip(charon->kernel_interface,
+										 this->my_virtual_ip);
+		this->my_virtual_ip->destroy(this->my_virtual_ip);
+	}
+	if (this->other_virtual_ip)
+	{
+		if (this->peer_cfg && this->peer_cfg->get_pool(this->peer_cfg))
+		{
+			hydra->attributes->release_address(hydra->attributes,
+							this->peer_cfg->get_pool(this->peer_cfg),
+							this->other_virtual_ip, get_other_eap_id(this));
+		}
+		this->other_virtual_ip->destroy(this->other_virtual_ip);
+	}
+	this->additional_addresses->destroy_offset(this->additional_addresses,
+													offsetof(host_t, destroy));
+#ifdef ME
+	if (this->is_mediation_server)
+	{
+		charon->mediation_manager->remove(charon->mediation_manager,
+										  this->ike_sa_id);
+	}
+	DESTROY_IF(this->server_reflexive_host);
+	chunk_free(&this->connect_id);
+#endif /* ME */
+	free(this->nat_detection_dest.ptr);
+
+	DESTROY_IF(this->my_host);
+	DESTROY_IF(this->other_host);
+	DESTROY_IF(this->my_id);
+	DESTROY_IF(this->other_id);
+	DESTROY_IF(this->local_host);
+	DESTROY_IF(this->remote_host);
+
+	DESTROY_IF(this->ike_cfg);
+	DESTROY_IF(this->peer_cfg);
+	DESTROY_IF(this->proposal);
+	this->my_auth->destroy(this->my_auth);
+	this->other_auth->destroy(this->other_auth);
+	this->my_auths->destroy_offset(this->my_auths,
+								   offsetof(auth_cfg_t, destroy));
+	this->other_auths->destroy_offset(this->other_auths,
+									  offsetof(auth_cfg_t, destroy));
+
+	this->ike_sa_id->destroy(this->ike_sa_id);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_sa_t * ike_sa_create(ike_sa_id_t *ike_sa_id)
+{
+	private_ike_sa_t *this = malloc_thing(private_ike_sa_t);
+	static u_int32_t unique_id = 0;
+
+	/* Public functions */
+	this->public.get_state = (ike_sa_state_t (*)(ike_sa_t*)) get_state;
+	this->public.set_state = (void (*)(ike_sa_t*,ike_sa_state_t)) set_state;
+	this->public.get_name = (char* (*)(ike_sa_t*))get_name;
+	this->public.get_statistic = (u_int32_t(*)(ike_sa_t*, statistic_t kind))get_statistic;
+	this->public.process_message = (status_t (*)(ike_sa_t*, message_t*)) process_message;
+	this->public.initiate = (status_t (*)(ike_sa_t*,child_cfg_t*,u_int32_t,traffic_selector_t*,traffic_selector_t*)) initiate;
+	this->public.get_ike_cfg = (ike_cfg_t* (*)(ike_sa_t*))get_ike_cfg;
+	this->public.set_ike_cfg = (void (*)(ike_sa_t*,ike_cfg_t*))set_ike_cfg;
+	this->public.get_peer_cfg = (peer_cfg_t* (*)(ike_sa_t*))get_peer_cfg;
+	this->public.set_peer_cfg = (void (*)(ike_sa_t*,peer_cfg_t*))set_peer_cfg;
+	this->public.get_auth_cfg = (auth_cfg_t*(*)(ike_sa_t*, bool local))get_auth_cfg;
+	this->public.create_auth_cfg_enumerator = (enumerator_t*(*)(ike_sa_t*, bool local))create_auth_cfg_enumerator;
+	this->public.add_auth_cfg = (void(*)(ike_sa_t*, bool local, auth_cfg_t *cfg))add_auth_cfg;
+	this->public.get_proposal = (proposal_t*(*)(ike_sa_t*))get_proposal;
+	this->public.set_proposal = (void(*)(ike_sa_t*, proposal_t *proposal))set_proposal;
+	this->public.get_id = (ike_sa_id_t* (*)(ike_sa_t*)) get_id;
+	this->public.get_my_host = (host_t* (*)(ike_sa_t*)) get_my_host;
+	this->public.set_my_host = (void (*)(ike_sa_t*,host_t*)) set_my_host;
+	this->public.get_other_host = (host_t* (*)(ike_sa_t*)) get_other_host;
+	this->public.set_other_host = (void (*)(ike_sa_t*,host_t*)) set_other_host;
+	this->public.set_message_id = (void(*)(ike_sa_t*, bool inbound, u_int32_t mid))set_message_id;
+	this->public.update_hosts = (void(*)(ike_sa_t*, host_t *me, host_t *other))update_hosts;
+	this->public.get_my_id = (identification_t* (*)(ike_sa_t*)) get_my_id;
+	this->public.set_my_id = (void (*)(ike_sa_t*,identification_t*)) set_my_id;
+	this->public.get_other_id = (identification_t* (*)(ike_sa_t*)) get_other_id;
+	this->public.set_other_id = (void (*)(ike_sa_t*,identification_t*)) set_other_id;
+	this->public.get_other_eap_id = (identification_t* (*)(ike_sa_t*)) get_other_eap_id;
+	this->public.enable_extension = (void(*)(ike_sa_t*, ike_extension_t extension))enable_extension;
+	this->public.supports_extension = (bool(*)(ike_sa_t*, ike_extension_t extension))supports_extension;
+	this->public.set_condition = (void (*)(ike_sa_t*, ike_condition_t,bool)) set_condition;
+	this->public.has_condition = (bool (*)(ike_sa_t*,ike_condition_t)) has_condition;
+	this->public.set_pending_updates = (void(*)(ike_sa_t*, u_int32_t updates))set_pending_updates;
+	this->public.get_pending_updates = (u_int32_t(*)(ike_sa_t*))get_pending_updates;
+	this->public.create_additional_address_iterator = (iterator_t*(*)(ike_sa_t*))create_additional_address_iterator;
+	this->public.add_additional_address = (void(*)(ike_sa_t*, host_t *host))add_additional_address;
+	this->public.has_mapping_changed = (bool(*)(ike_sa_t*, chunk_t hash))has_mapping_changed;
+	this->public.retransmit = (status_t (*)(ike_sa_t *, u_int32_t)) retransmit;
+	this->public.delete = (status_t (*)(ike_sa_t*))delete_;
+	this->public.destroy = (void (*)(ike_sa_t*))destroy;
+	this->public.send_dpd = (status_t (*)(ike_sa_t*)) send_dpd;
+	this->public.send_keepalive = (void (*)(ike_sa_t*)) send_keepalive;
+	this->public.get_keymat = (keymat_t*(*)(ike_sa_t*))get_keymat;
+	this->public.add_child_sa = (void (*)(ike_sa_t*,child_sa_t*)) add_child_sa;
+	this->public.get_child_sa = (child_sa_t* (*)(ike_sa_t*,protocol_id_t,u_int32_t,bool)) get_child_sa;
+	this->public.create_child_sa_iterator = (iterator_t* (*)(ike_sa_t*)) create_child_sa_iterator;
+	this->public.rekey_child_sa = (status_t (*)(ike_sa_t*,protocol_id_t,u_int32_t)) rekey_child_sa;
+	this->public.delete_child_sa = (status_t (*)(ike_sa_t*,protocol_id_t,u_int32_t)) delete_child_sa;
+	this->public.destroy_child_sa = (status_t (*)(ike_sa_t*,protocol_id_t,u_int32_t))destroy_child_sa;
+	this->public.rekey = (status_t (*)(ike_sa_t*))rekey;
+	this->public.reauth = (status_t (*)(ike_sa_t*))reauth;
+	this->public.reestablish = (status_t (*)(ike_sa_t*))reestablish;
+	this->public.set_auth_lifetime = (void(*)(ike_sa_t*, u_int32_t lifetime))set_auth_lifetime;
+	this->public.roam = (status_t(*)(ike_sa_t*,bool))roam;
+	this->public.inherit = (status_t (*)(ike_sa_t*,ike_sa_t*))inherit;
+	this->public.generate_message = (status_t (*)(ike_sa_t*,message_t*,packet_t**))generate_message;
+	this->public.reset = (void (*)(ike_sa_t*))reset;
+	this->public.get_unique_id = (u_int32_t (*)(ike_sa_t*))get_unique_id;
+	this->public.set_virtual_ip = (void (*)(ike_sa_t*,bool,host_t*))set_virtual_ip;
+	this->public.get_virtual_ip = (host_t* (*)(ike_sa_t*,bool))get_virtual_ip;
+	this->public.add_configuration_attribute = (void(*)(ike_sa_t*, attribute_handler_t *handler,configuration_attribute_type_t type, chunk_t data))add_configuration_attribute;
+	this->public.set_kmaddress = (void (*)(ike_sa_t*,host_t*,host_t*))set_kmaddress;
+#ifdef ME
+	this->public.act_as_mediation_server = (void (*)(ike_sa_t*)) act_as_mediation_server;
+	this->public.get_server_reflexive_host = (host_t* (*)(ike_sa_t*)) get_server_reflexive_host;
+	this->public.set_server_reflexive_host = (void (*)(ike_sa_t*,host_t*)) set_server_reflexive_host;
+	this->public.get_connect_id = (chunk_t (*)(ike_sa_t*)) get_connect_id;
+	this->public.initiate_mediation = (status_t (*)(ike_sa_t*,peer_cfg_t*)) initiate_mediation;
+	this->public.initiate_mediated = (status_t (*)(ike_sa_t*,host_t*,host_t*,chunk_t)) initiate_mediated;
+	this->public.relay = (status_t (*)(ike_sa_t*,identification_t*,chunk_t,chunk_t,linked_list_t*,bool)) relay;
+	this->public.callback = (status_t (*)(ike_sa_t*,identification_t*)) callback;
+	this->public.respond = (status_t (*)(ike_sa_t*,identification_t*,chunk_t)) respond;
+#endif /* ME */
+
+	/* initialize private fields */
+	this->ike_sa_id = ike_sa_id->clone(ike_sa_id);
+	this->child_sas = linked_list_create();
+	this->my_host = host_create_any(AF_INET);
+	this->my_host->set_port(this->my_host, IKEV2_UDP_PORT);
+	this->other_host = host_create_any(AF_INET);
+	this->my_id = identification_create_from_encoding(ID_ANY, chunk_empty);
+	this->other_id = identification_create_from_encoding(ID_ANY, chunk_empty);
+	this->extensions = 0;
+	this->conditions = 0;
+	this->keymat = keymat_create(ike_sa_id->is_initiator(ike_sa_id));
+	this->state = IKE_CREATED;
+	this->keepalive_interval = lib->settings->get_time(lib->settings,
+									"charon.keep_alive", KEEPALIVE_INTERVAL);
+	memset(this->stats, 0, sizeof(this->stats));
+	this->stats[STAT_INBOUND] = this->stats[STAT_OUTBOUND] = time_monotonic(NULL);
+	this->ike_cfg = NULL;
+	this->peer_cfg = NULL;
+	this->my_auth = auth_cfg_create();
+	this->other_auth = auth_cfg_create();
+	this->my_auths = linked_list_create();
+	this->other_auths = linked_list_create();
+	this->proposal = NULL;
+	this->task_manager = task_manager_create(&this->public);
+	this->unique_id = ++unique_id;
+	this->my_virtual_ip = NULL;
+	this->other_virtual_ip = NULL;
+	this->additional_addresses = linked_list_create();
+	this->attributes = linked_list_create();
+	this->nat_detection_dest = chunk_empty;
+	this->pending_updates = 0;
+	this->keyingtry = 0;
+	this->local_host = NULL;
+	this->remote_host = NULL;
+#ifdef ME
+	this->is_mediation_server = FALSE;
+	this->server_reflexive_host = NULL;
+	this->connect_id = chunk_empty;
+#endif /* ME */
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/ike_sa.h b/src/libcharon/sa/ike_sa.h
new file mode 100644
index 000000000..c61502edf
--- /dev/null
+++ b/src/libcharon/sa/ike_sa.h
@@ -0,0 +1,921 @@
+/*
+ * Copyright (C) 2006-2008 Tobias Brunner
+ * Copyright (C) 2006 Daniel Roethlisberger
+ * Copyright (C) 2005-2009 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_sa ike_sa
+ * @{ @ingroup sa
+ */
+
+#ifndef IKE_SA_H_
+#define IKE_SA_H_
+
+typedef enum ike_extension_t ike_extension_t;
+typedef enum ike_condition_t ike_condition_t;
+typedef enum ike_sa_state_t ike_sa_state_t;
+typedef enum statistic_t statistic_t;
+typedef struct ike_sa_t ike_sa_t;
+
+#include <library.h>
+#include <attributes/attribute_handler.h>
+#include <encoding/message.h>
+#include <encoding/payloads/proposal_substructure.h>
+#include <encoding/payloads/configuration_attribute.h>
+#include <sa/ike_sa_id.h>
+#include <sa/child_sa.h>
+#include <sa/tasks/task.h>
+#include <sa/keymat.h>
+#include <config/peer_cfg.h>
+#include <config/ike_cfg.h>
+#include <config/auth_cfg.h>
+
+/**
+ * Timeout in seconds after that a half open IKE_SA gets deleted.
+ */
+#define HALF_OPEN_IKE_SA_TIMEOUT 30
+
+/**
+ * Interval to send keepalives when NATed, in seconds.
+ */
+#define KEEPALIVE_INTERVAL 20
+
+/**
+ * After which time rekeying should be retried if it failed, in seconds.
+ */
+#define RETRY_INTERVAL 30
+
+/**
+ * Jitter to subtract from RETRY_INTERVAL to randomize rekey retry.
+ */
+#define RETRY_JITTER 20
+
+/**
+ * Extensions (or optional features) the peer supports
+ */
+enum ike_extension_t {
+
+	/**
+	 * peer supports NAT traversal as specified in RFC4306
+	 */
+	EXT_NATT = (1<<0),
+
+	/**
+	 * peer supports MOBIKE (RFC4555)
+	 */
+	EXT_MOBIKE = (1<<1),
+
+	/**
+	 * peer supports HTTP cert lookups as specified in RFC4306
+	 */
+	EXT_HASH_AND_URL = (1<<2),
+
+	/**
+	 * peer supports multiple authentication exchanges, RFC4739
+	 */
+	EXT_MULTIPLE_AUTH = (1<<3),
+
+	/**
+	 * peer uses strongSwan, accept private use extensions
+	 */
+	EXT_STRONGSWAN = (1<<4),
+
+	/**
+	 * peer supports EAP-only authentication, draft-eronen-ipsec-ikev2-eap-auth
+	 */
+	EXT_EAP_ONLY_AUTHENTICATION = (1<<5),
+};
+
+/**
+ * Conditions of an IKE_SA, change during its lifetime
+ */
+enum ike_condition_t {
+
+	/**
+	 * Connection is natted (or faked) somewhere
+	 */
+	COND_NAT_ANY = (1<<0),
+
+	/**
+	 * we are behind NAT
+	 */
+	COND_NAT_HERE = (1<<1),
+
+	/**
+	 * other is behind NAT
+	 */
+	COND_NAT_THERE = (1<<2),
+
+	/**
+	 * Faking NAT to enforce UDP encapsulation
+	 */
+	COND_NAT_FAKE = (1<<3),
+
+	/**
+	 * peer has been authenticated using EAP at least once
+	 */
+	COND_EAP_AUTHENTICATED = (1<<4),
+
+	/**
+	 * received a certificate request from the peer
+	 */
+	COND_CERTREQ_SEEN = (1<<5),
+
+	/**
+	 * Local peer is the "original" IKE initiator. Unaffected from rekeying.
+	 */
+	COND_ORIGINAL_INITIATOR = (1<<6),
+
+	/**
+	 * IKE_SA is stale, the peer is currently unreachable (MOBIKE)
+	 */
+	COND_STALE = (1<<7),
+};
+
+/**
+ * Timing information and statistics to query from an SA
+ */
+enum statistic_t {
+	/** Timestamp of SA establishement */
+	STAT_ESTABLISHED = 0,
+	/** Timestamp of scheudled rekeying */
+	STAT_REKEY,
+	/** Timestamp of scheudled reauthentication */
+	STAT_REAUTH,
+	/** Timestamp of scheudled delete */
+	STAT_DELETE,
+	/** Timestamp of last inbound IKE packet */
+	STAT_INBOUND,
+	/** Timestamp of last outbound IKE packet */
+	STAT_OUTBOUND,
+
+	STAT_MAX
+};
+
+/**
+ * State of an IKE_SA.
+ *
+ * An IKE_SA passes various states in its lifetime. A newly created
+ * SA is in the state CREATED.
+ * @verbatim
+                 +----------------+
+                 ¦   SA_CREATED   ¦
+                 +----------------+
+                         ¦
+    on initiate()--->    ¦   <----- on IKE_SA_INIT received
+                         V
+                 +----------------+
+                 ¦ SA_CONNECTING  ¦
+                 +----------------+
+                         ¦
+                         ¦   <----- on IKE_AUTH successfully completed
+                         V
+                 +----------------+
+                 ¦ SA_ESTABLISHED ¦-------------------------+ <-- on rekeying
+                 +----------------+                         ¦
+                         ¦                                  V
+    on delete()--->      ¦   <----- on IKE_SA        +-------------+
+                         ¦          delete request   ¦ SA_REKEYING ¦
+                         ¦          received         +-------------+
+                         V                                  ¦
+                 +----------------+                         ¦
+                 ¦  SA_DELETING   ¦<------------------------+ <-- after rekeying
+                 +----------------+
+                         ¦
+                         ¦   <----- after delete() acknowledged
+                         ¦
+                        \V/
+                         X
+                        / \
+   @endverbatim
+ */
+enum ike_sa_state_t {
+
+	/**
+	 * IKE_SA just got created, but is not initiating nor responding yet.
+	 */
+	IKE_CREATED,
+
+	/**
+	 * IKE_SA gets initiated actively or passively
+	 */
+	IKE_CONNECTING,
+
+	/**
+	 * IKE_SA is fully established
+	 */
+	IKE_ESTABLISHED,
+
+	/**
+	 * IKE_SA is managed externally and does not process messages
+	 */
+	IKE_PASSIVE,
+
+	/**
+	 * IKE_SA rekeying in progress
+	 */
+	IKE_REKEYING,
+
+	/**
+	 * IKE_SA is in progress of deletion
+	 */
+	IKE_DELETING,
+
+	/**
+	 * IKE_SA object gets destroyed
+	 */
+	IKE_DESTROYING,
+};
+
+/**
+ * enum names for ike_sa_state_t.
+ */
+extern enum_name_t *ike_sa_state_names;
+
+/**
+ * Class ike_sa_t representing an IKE_SA.
+ *
+ * An IKE_SA contains crypto information related to a connection
+ * with a peer. It contains multiple IPsec CHILD_SA, for which
+ * it is responsible. All traffic is handled by an IKE_SA, using
+ * the task manager and its tasks.
+ */
+struct ike_sa_t {
+
+	/**
+	 * Get the id of the SA.
+	 *
+	 * Returned ike_sa_id_t object is not getting cloned!
+	 *
+	 * @return 				ike_sa's ike_sa_id_t
+	 */
+	ike_sa_id_t* (*get_id) (ike_sa_t *this);
+
+	/**
+	 * Get the numerical ID uniquely defining this IKE_SA.
+	 *
+	 * @return 				unique ID
+	 */
+	u_int32_t (*get_unique_id) (ike_sa_t *this);
+
+	/**
+	 * Get the state of the IKE_SA.
+	 *
+	 * @return				state of the IKE_SA
+	 */
+	ike_sa_state_t (*get_state) (ike_sa_t *this);
+
+	/**
+	 * Set the state of the IKE_SA.
+	 *
+	 * @param state			state to set for the IKE_SA
+	 */
+	void (*set_state) (ike_sa_t *this, ike_sa_state_t ike_sa);
+
+	/**
+	 * Get the name of the connection this IKE_SA uses.
+	 *
+	 * @return				name
+	 */
+	char* (*get_name) (ike_sa_t *this);
+
+	/**
+	 * Get statistic values from the IKE_SA.
+	 *
+	 * @param kind			kind of requested value
+	 * @return				value as integer
+	 */
+	u_int32_t (*get_statistic)(ike_sa_t *this, statistic_t kind);
+
+	/**
+	 * Get the own host address.
+	 *
+	 * @return				host address
+	 */
+	host_t* (*get_my_host) (ike_sa_t *this);
+
+	/**
+	 * Set the own host address.
+	 *
+	 * @param me			host address
+	 */
+	void (*set_my_host) (ike_sa_t *this, host_t *me);
+
+	/**
+	 * Get the other peers host address.
+	 *
+	 * @return				host address
+	 */
+	host_t* (*get_other_host) (ike_sa_t *this);
+
+	/**
+	 * Set the others host address.
+	 *
+	 * @param other			host address
+	 */
+	void (*set_other_host) (ike_sa_t *this, host_t *other);
+
+	/**
+	 * Update the IKE_SAs host.
+	 *
+	 * Hosts may be NULL to use current host.
+	 *
+	 * @param me			new local host address, or NULL
+	 * @param other			new remote host address, or NULL
+	 */
+	void (*update_hosts)(ike_sa_t *this, host_t *me, host_t *other);
+
+	/**
+	 * Get the own identification.
+	 *
+	 * @return				identification
+	 */
+	identification_t* (*get_my_id) (ike_sa_t *this);
+
+	/**
+	 * Set the own identification.
+	 *
+	 * @param me			identification
+	 */
+	void (*set_my_id) (ike_sa_t *this, identification_t *me);
+
+	/**
+	 * Get the other peer's identification.
+	 *
+	 * @return				identification
+	 */
+	identification_t* (*get_other_id) (ike_sa_t *this);
+
+	/**
+	 * Get the others peer identity, but prefer an EAP-Identity.
+	 *
+	 * @return				EAP or IKEv2 identity
+	 */
+	identification_t* (*get_other_eap_id)(ike_sa_t *this);
+
+	/**
+	 * Set the other peer's identification.
+	 *
+	 * @param other			identification
+	 */
+	void (*set_other_id) (ike_sa_t *this, identification_t *other);
+
+	/**
+	 * Get the config used to setup this IKE_SA.
+	 *
+	 * @return				ike_config
+	 */
+	ike_cfg_t* (*get_ike_cfg) (ike_sa_t *this);
+
+	/**
+	 * Set the config to setup this IKE_SA.
+	 *
+	 * @param config		ike_config to use
+	 */
+	void (*set_ike_cfg) (ike_sa_t *this, ike_cfg_t* config);
+
+	/**
+	 * Get the peer config used by this IKE_SA.
+	 *
+	 * @return				peer_config
+	 */
+	peer_cfg_t* (*get_peer_cfg) (ike_sa_t *this);
+
+	/**
+	 * Set the peer config to use with this IKE_SA.
+	 *
+	 * @param config		peer_config to use
+	 */
+	void (*set_peer_cfg) (ike_sa_t *this, peer_cfg_t *config);
+
+	/**
+	 * Get the authentication config with rules of the current auth round.
+	 *
+	 * @param local			TRUE for local rules, FALSE for remote constraints
+	 * @return				current cfg
+	 */
+	auth_cfg_t* (*get_auth_cfg)(ike_sa_t *this, bool local);
+
+	/**
+	 * Insert a completed authentication round.
+	 *
+	 * @param local			TRUE for own rules, FALSE for others constraints
+	 * @param cfg			auth config to append
+	 */
+	void (*add_auth_cfg)(ike_sa_t *this, bool local, auth_cfg_t *cfg);
+
+	/**
+	 * Create an enumerator over added authentication rounds.
+	 *
+	 * @param local			TRUE for own rules, FALSE for others constraints
+	 * @return				enumerator over auth_cfg_t
+	 */
+	enumerator_t* (*create_auth_cfg_enumerator)(ike_sa_t *this, bool local);
+
+	/**
+	 * Get the selected proposal of this IKE_SA.
+	 *
+	 * @return				selected proposal
+	 */
+	proposal_t* (*get_proposal)(ike_sa_t *this);
+
+	/**
+	 * Set the proposal selected for this IKE_SA.
+	 *
+	 * @param				selected proposal
+	 */
+	void (*set_proposal)(ike_sa_t *this, proposal_t *proposal);
+
+	/**
+	 * Set the message id of the IKE_SA.
+	 *
+	 * The IKE_SA stores two message IDs, one for initiating exchanges (send)
+	 * and one to respond to exchanges (expect).
+	 *
+	 * @param initiate		TRUE to set message ID for initiating
+	 * @param mid			message id to set
+	 */
+	void (*set_message_id)(ike_sa_t *this, bool initiate, u_int32_t mid);
+
+	/**
+	 * Add an additional address for the peer.
+	 *
+	 * In MOBIKE, a peer may transmit additional addresses where it is
+	 * reachable. These are stored in the IKE_SA.
+	 * The own list of addresses is not stored, they are queried from
+	 * the kernel when required.
+	 *
+	 * @param host			host to add to list
+	 */
+	void (*add_additional_address)(ike_sa_t *this, host_t *host);
+
+	/**
+	 * Create an iterator over all additional addresses of the peer.
+	 *
+	 * @return 				iterator over addresses
+	 */
+	iterator_t* (*create_additional_address_iterator)(ike_sa_t *this);
+
+	/**
+	 * Check if mappings have changed on a NAT for our source address.
+	 *
+	 * @param hash			received DESTINATION_IP hash
+	 * @return				TRUE if mappings have changed
+	 */
+	bool (*has_mapping_changed)(ike_sa_t *this, chunk_t hash);
+
+	/**
+	 * Enable an extension the peer supports.
+	 *
+	 * If support for an IKE extension is detected, this method is called
+	 * to enable that extension and behave accordingly.
+	 *
+	 * @param extension		extension to enable
+	 */
+	void (*enable_extension)(ike_sa_t *this, ike_extension_t extension);
+
+	/**
+	 * Check if the peer supports an extension.
+	 *
+	 * @param extension		extension to check for support
+	 * @return				TRUE if peer supports it, FALSE otherwise
+	 */
+	bool (*supports_extension)(ike_sa_t *this, ike_extension_t extension);
+
+	/**
+	 * Enable/disable a condition flag for this IKE_SA.
+	 *
+	 * @param condition		condition to enable/disable
+	 * @param enable		TRUE to enable condition, FALSE to disable
+	 */
+	void (*set_condition) (ike_sa_t *this, ike_condition_t condition, bool enable);
+
+	/**
+	 * Check if a condition flag is set.
+	 *
+	 * @param condition		condition to check
+	 * @return				TRUE if condition flag set, FALSE otherwise
+	 */
+	bool (*has_condition) (ike_sa_t *this, ike_condition_t condition);
+
+	/**
+	 * Get the number of queued MOBIKE address updates.
+	 *
+	 * @return				number of pending updates
+	 */
+	u_int32_t (*get_pending_updates)(ike_sa_t *this);
+
+	/**
+	 * Set the number of queued MOBIKE address updates.
+	 *
+	 * @param updates		number of pending updates
+	 */
+	void (*set_pending_updates)(ike_sa_t *this, u_int32_t updates);
+
+#ifdef ME
+	/**
+	 * Activate mediation server functionality for this IKE_SA.
+	 */
+	void (*act_as_mediation_server) (ike_sa_t *this);
+
+	/**
+	 * Get the server reflexive host.
+	 *
+	 * @return				server reflexive host
+	 */
+	host_t* (*get_server_reflexive_host) (ike_sa_t *this);
+
+	/**
+	 * Set the server reflexive host.
+	 *
+	 * @param host			server reflexive host
+	 */
+	void (*set_server_reflexive_host) (ike_sa_t *this, host_t *host);
+
+	/**
+	 * Get the connect ID.
+	 *
+	 * @return				connect ID
+	 */
+	chunk_t (*get_connect_id) (ike_sa_t *this);
+
+	/**
+	 * Initiate the mediation of a mediated connection (i.e. initiate a
+	 * ME_CONNECT exchange to a mediation server).
+	 *
+	 * @param mediated_cfg	peer_cfg of the mediated connection
+	 * @return
+	 * 						- SUCCESS if initialization started
+	 * 						- DESTROY_ME if initialization failed
+	 */
+	status_t (*initiate_mediation) (ike_sa_t *this, peer_cfg_t *mediated_cfg);
+
+	/**
+	 * Initiate the mediated connection
+	 *
+	 * @param me			local endpoint (gets cloned)
+	 * @param other			remote endpoint (gets cloned)
+	 * @param connect_id	connect ID (gets cloned)
+	 * @return
+	 * 						- SUCCESS if initialization started
+	 * 						- DESTROY_ME if initialization failed
+	 */
+	status_t (*initiate_mediated) (ike_sa_t *this, host_t *me, host_t *other,
+								   chunk_t connect_id);
+
+	/**
+	 * Relay data from one peer to another (i.e. initiate a ME_CONNECT exchange
+	 * to a peer).
+	 *
+	 * Data is cloned.
+	 *
+	 * @param requester		ID of the requesting peer
+	 * @param connect_id	data of the ME_CONNECTID payload
+	 * @param connect_key	data of the ME_CONNECTKEY payload
+	 * @param endpoints		endpoints
+	 * @param response		TRUE if this is a response
+	 * @return
+	 * 						- SUCCESS if relay started
+	 * 						- DESTROY_ME if relay failed
+	 */
+	status_t (*relay) (ike_sa_t *this, identification_t *requester,
+					   chunk_t connect_id, chunk_t connect_key,
+					   linked_list_t *endpoints, bool response);
+
+	/**
+	 * Send a callback to a peer.
+	 *
+	 * Data is cloned.
+	 *
+	 * @param peer_id		ID of the other peer
+	 * @return
+	 * 						- SUCCESS if response started
+	 * 						- DESTROY_ME if response failed
+	 */
+	status_t (*callback) (ike_sa_t *this, identification_t *peer_id);
+
+	/**
+	 * Respond to a ME_CONNECT request.
+	 *
+	 * Data is cloned.
+	 *
+	 * @param peer_id		ID of the other peer
+	 * @param connect_id	the connect ID supplied by the initiator
+	 * @return
+	 * 						- SUCCESS if response started
+	 * 						- DESTROY_ME if response failed
+	 */
+	status_t (*respond) (ike_sa_t *this, identification_t *peer_id,
+						 chunk_t connect_id);
+#endif /* ME */
+
+	/**
+	 * Initiate a new connection.
+	 *
+	 * The configs are owned by the IKE_SA after the call. If the initiate
+	 * is triggered by a packet, traffic selectors of the packet can be added
+	 * to the CHILD_SA.
+	 *
+	 * @param child_cfg		child config to create CHILD from
+	 * @param reqid			reqid to use for CHILD_SA, 0 assigne uniquely
+	 * @param tsi			source of triggering packet
+	 * @param tsr			destination of triggering packet.
+	 * @return
+	 * 						- SUCCESS if initialization started
+	 * 						- DESTROY_ME if initialization failed
+	 */
+	status_t (*initiate) (ike_sa_t *this, child_cfg_t *child_cfg,
+						  u_int32_t reqid, traffic_selector_t *tsi,
+						  traffic_selector_t *tsr);
+
+	/**
+	 * Initiates the deletion of an IKE_SA.
+	 *
+	 * Sends a delete message to the remote peer and waits for
+	 * its response. If the response comes in, or a timeout occurs,
+	 * the IKE SA gets deleted.
+	 *
+	 * @return
+	 * 						- SUCCESS if deletion is initialized
+	 * 						- DESTROY_ME, if the IKE_SA is not in
+	 * 						  an established state and can not be
+	 * 						  deleted (but destroyed).
+	 */
+	status_t (*delete) (ike_sa_t *this);
+
+	/**
+	 * Update IKE_SAs after network interfaces have changed.
+	 *
+	 * Whenever the network interface configuration changes, the kernel
+	 * interface calls roam() on each IKE_SA. The IKE_SA then checks if
+	 * the new network config requires changes, and handles appropriate.
+	 * If MOBIKE is supported, addresses are updated; If not, the tunnel is
+	 * restarted.
+	 *
+	 * @param address		TRUE if address list changed, FALSE otherwise
+	 * @return				SUCCESS, FAILED, DESTROY_ME
+	 */
+	status_t (*roam)(ike_sa_t *this, bool address);
+
+	/**
+	 * Processes a incoming IKEv2-Message.
+	 *
+	 * Message processing may fail. If a critical failure occurs,
+	 * process_message() return DESTROY_ME. Then the caller must
+	 * destroy the IKE_SA immediatly, as it is unusable.
+	 *
+	 * @param message 		message to process
+	 * @return
+	 * 						- SUCCESS
+	 * 						- FAILED
+	 * 						- DESTROY_ME if this IKE_SA MUST be deleted
+	 */
+	status_t (*process_message) (ike_sa_t *this, message_t *message);
+
+	/**
+	 * Generate a IKE message to send it to the peer.
+	 *
+	 * This method generates all payloads in the message and encrypts/signs
+	 * the packet.
+	 *
+	 * @param message 		message to generate
+	 * @param packet		generated output packet
+	 * @return
+	 * 						- SUCCESS
+	 * 						- FAILED
+	 * 						- DESTROY_ME if this IKE_SA MUST be deleted
+	 */
+	status_t (*generate_message) (ike_sa_t *this, message_t *message,
+								  packet_t **packet);
+
+	/**
+	 * Retransmits a request.
+	 *
+	 * @param message_id	ID of the request to retransmit
+	 * @return
+	 * 						- SUCCESS
+	 * 						- NOT_FOUND if request doesn't have to be retransmited
+	 */
+	status_t (*retransmit) (ike_sa_t *this, u_int32_t message_id);
+
+	/**
+	 * Sends a DPD request to the peer.
+	 *
+	 * To check if a peer is still alive, periodic
+	 * empty INFORMATIONAL messages are sent if no
+	 * other traffic was received.
+	 *
+	 * @return
+	 * 						- SUCCESS
+	 * 						- DESTROY_ME, if peer did not respond
+	 */
+	status_t (*send_dpd) (ike_sa_t *this);
+
+	/**
+	 * Sends a keep alive packet.
+	 *
+	 * To refresh NAT tables in a NAT router
+	 * between the peers, periodic empty
+	 * UDP packets are sent if no other traffic
+	 * was sent.
+	 */
+	void (*send_keepalive) (ike_sa_t *this);
+
+	/**
+	 * Get the keying material of this IKE_SA.
+	 *
+	 * @return				per IKE_SA keymat instance
+	 */
+	keymat_t* (*get_keymat)(ike_sa_t *this);
+
+	/**
+	 * Associates a child SA to this IKE SA
+	 *
+	 * @param child_sa		child_sa to add
+	 */
+	void (*add_child_sa) (ike_sa_t *this, child_sa_t *child_sa);
+
+	/**
+	 * Get a CHILD_SA identified by protocol and SPI.
+	 *
+	 * @param protocol		protocol of the SA
+	 * @param spi			SPI of the CHILD_SA
+	 * @param inbound		TRUE if SPI is inbound, FALSE if outbound
+	 * @return				child_sa, or NULL if none found
+	 */
+	child_sa_t* (*get_child_sa) (ike_sa_t *this, protocol_id_t protocol,
+								 u_int32_t spi, bool inbound);
+
+	/**
+	 * Create an iterator over all CHILD_SAs.
+	 *
+	 * @return				iterator
+	 */
+	iterator_t* (*create_child_sa_iterator) (ike_sa_t *this);
+
+	/**
+	 * Rekey the CHILD SA with the specified reqid.
+	 *
+	 * Looks for a CHILD SA owned by this IKE_SA, and start the rekeing.
+	 *
+	 * @param protocol		protocol of the SA
+	 * @param spi			inbound SPI of the CHILD_SA
+	 * @return
+	 * 						- NOT_FOUND, if IKE_SA has no such CHILD_SA
+	 * 						- SUCCESS, if rekeying initiated
+	 */
+	status_t (*rekey_child_sa) (ike_sa_t *this, protocol_id_t protocol, u_int32_t spi);
+
+	/**
+	 * Close the CHILD SA with the specified protocol/SPI.
+	 *
+	 * Looks for a CHILD SA owned by this IKE_SA, deletes it and
+	 * notify's the remote peer about the delete. The associated
+	 * states and policies in the kernel get deleted, if they exist.
+	 *
+	 * @param protocol		protocol of the SA
+	 * @param spi			inbound SPI of the CHILD_SA
+	 * @return
+	 * 						- NOT_FOUND, if IKE_SA has no such CHILD_SA
+	 * 						- SUCCESS, if delete message sent
+	 */
+	status_t (*delete_child_sa) (ike_sa_t *this, protocol_id_t protocol, u_int32_t spi);
+
+	/**
+	 * Destroy a CHILD SA with the specified protocol/SPI.
+	 *
+	 * Looks for a CHILD SA owned by this IKE_SA and destroys it.
+	 *
+	 * @param protocol		protocol of the SA
+	 * @param spi			inbound SPI of the CHILD_SA
+	 * @return
+	 * 						- NOT_FOUND, if IKE_SA has no such CHILD_SA
+	 * 						- SUCCESS
+	 */
+	status_t (*destroy_child_sa) (ike_sa_t *this, protocol_id_t protocol, u_int32_t spi);
+
+	/**
+	 * Rekey the IKE_SA.
+	 *
+	 * Sets up a new IKE_SA, moves all CHILDs to it and deletes this IKE_SA.
+	 *
+	 * @return				- SUCCESS, if IKE_SA rekeying initiated
+	 */
+	status_t (*rekey) (ike_sa_t *this);
+
+	/**
+	 * Reauthenticate the IKE_SA.
+	 *
+	 * Create a completely new IKE_SA with authentication, recreates all children
+	 * within the IKE_SA, closes this IKE_SA.
+	 *
+	 * @return				DESTROY_ME to destroy the IKE_SA
+	 */
+	status_t (*reauth) (ike_sa_t *this);
+
+	/**
+	 * Restablish the IKE_SA.
+	 *
+	 * Reestablish an IKE_SA after it has been closed.
+	 *
+	 * @return				DESTROY_ME to destroy the IKE_SA
+	 */
+	status_t (*reestablish) (ike_sa_t *this);
+
+	/**
+	 * Set the lifetime limit received from a AUTH_LIFETIME notify.
+	 *
+	 * @param lifetime		lifetime in seconds
+	 */
+	void (*set_auth_lifetime)(ike_sa_t *this, u_int32_t lifetime);
+
+	/**
+	 * Set the virtual IP to use for this IKE_SA and its children.
+	 *
+	 * The virtual IP is assigned per IKE_SA, not per CHILD_SA. It has the same
+	 * lifetime as the IKE_SA.
+	 *
+	 * @param local			TRUE to set local address, FALSE for remote
+	 * @param ip			IP to set as virtual IP
+	 */
+	void (*set_virtual_ip) (ike_sa_t *this, bool local, host_t *ip);
+
+	/**
+	 * Get the virtual IP configured.
+	 *
+	 * @param local			TRUE to get local virtual IP, FALSE for remote
+	 * @return				host_t *virtual IP
+	 */
+	host_t* (*get_virtual_ip) (ike_sa_t *this, bool local);
+
+	/**
+	 * Register a configuration attribute to the IKE_SA.
+	 *
+	 * If an IRAS sends a configuration attribute it is installed and
+	 * registered at the IKE_SA. Attributes are inherit()ed and get released
+	 * when the IKE_SA is closed.
+	 *
+	 * @param handler		handler installed the attribute, use for release()
+	 * @param type			configuration attribute type
+	 * @param data			associated attribute data
+	 */
+	void (*add_configuration_attribute)(ike_sa_t *this,
+							attribute_handler_t *handler,
+							configuration_attribute_type_t type, chunk_t data);
+
+	/**
+	 * Set local and remote host addresses to be used for IKE.
+	 *
+	 * These addresses are communicated via the KMADDRESS field of a MIGRATE
+	 * message sent via the NETLINK or PF _KEY kernel socket interface.
+	 *
+	 * @param local			local kmaddress
+	 * @param remote		remote kmaddress
+	 */
+	void (*set_kmaddress) (ike_sa_t *this, host_t *local, host_t *remote);
+
+	/**
+	 * Inherit all attributes of other to this after rekeying.
+	 *
+	 * When rekeying is completed, all CHILD_SAs, the virtual IP and all
+	 * outstanding tasks are moved from other to this.
+	 * As this call may initiate inherited tasks, a status is returned.
+	 *
+	 * @param other			other task to inherit from
+	 * @return				DESTROY_ME if initiation of inherited task failed
+	 */
+	status_t (*inherit) (ike_sa_t *this, ike_sa_t *other);
+
+	/**
+	 * Reset the IKE_SA, useable when initiating fails
+	 */
+	void (*reset) (ike_sa_t *this);
+
+	/**
+	 * Destroys a ike_sa_t object.
+	 */
+	void (*destroy) (ike_sa_t *this);
+};
+
+/**
+ * Creates an ike_sa_t object with a specific ID.
+ *
+ * @param ike_sa_id 	ike_sa_id_t object to associate with new IKE_SA
+ * @return 				ike_sa_t object
+ */
+ike_sa_t *ike_sa_create(ike_sa_id_t *ike_sa_id);
+
+#endif /** IKE_SA_H_ @}*/
diff --git a/src/libcharon/sa/ike_sa_id.c b/src/libcharon/sa/ike_sa_id.c
new file mode 100644
index 000000000..94c5405f2
--- /dev/null
+++ b/src/libcharon/sa/ike_sa_id.c
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 2005-2006 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_sa_id.h"
+
+#include <stdio.h>
+
+
+typedef struct private_ike_sa_id_t private_ike_sa_id_t;
+
+/**
+ * Private data of an ike_sa_id_t object.
+ */
+struct private_ike_sa_id_t {
+	/**
+	 * Public interface of ike_sa_id_t.
+	 */
+	ike_sa_id_t public;
+
+	 /**
+	  * SPI of Initiator.
+	  */
+	u_int64_t initiator_spi;
+
+	 /**
+	  * SPI of Responder.
+	  */
+	u_int64_t responder_spi;
+
+	/**
+	 * Role for specific IKE_SA.
+	 */
+	bool is_initiator_flag;
+};
+
+/**
+ * Implementation of ike_sa_id_t.set_responder_spi.
+ */
+static void set_responder_spi (private_ike_sa_id_t *this, u_int64_t responder_spi)
+{
+	this->responder_spi = responder_spi;
+}
+
+/**
+ * Implementation of ike_sa_id_t.set_initiator_spi.
+ */
+static void set_initiator_spi(private_ike_sa_id_t *this, u_int64_t initiator_spi)
+{
+	this->initiator_spi = initiator_spi;
+}
+
+/**
+ * Implementation of ike_sa_id_t.get_initiator_spi.
+ */
+static u_int64_t get_initiator_spi (private_ike_sa_id_t *this)
+{
+	return this->initiator_spi;
+}
+
+/**
+ * Implementation of ike_sa_id_t.get_responder_spi.
+ */
+static u_int64_t get_responder_spi (private_ike_sa_id_t *this)
+{
+	return this->responder_spi;
+}
+
+/**
+ * Implementation of ike_sa_id_t.equals.
+ */
+static bool equals (private_ike_sa_id_t *this, private_ike_sa_id_t *other)
+{
+	if (other == NULL)
+	{
+		return FALSE;
+	}
+	if ((this->is_initiator_flag == other->is_initiator_flag) &&
+		(this->initiator_spi == other->initiator_spi) &&
+		(this->responder_spi == other->responder_spi))
+	{
+		/* private_ike_sa_id's are equal */
+		return TRUE;
+	}
+	else
+	{
+		/* private_ike_sa_id's are not equal */
+		return FALSE;
+	}
+}
+
+/**
+ * Implementation of ike_sa_id_t.replace_values.
+ */
+static void replace_values(private_ike_sa_id_t *this, private_ike_sa_id_t *other)
+{
+	this->initiator_spi = other->initiator_spi;
+	this->responder_spi = other->responder_spi;
+	this->is_initiator_flag = other->is_initiator_flag;
+}
+
+/**
+ * Implementation of ike_sa_id_t.is_initiator.
+ */
+static bool is_initiator(private_ike_sa_id_t *this)
+{
+	return this->is_initiator_flag;
+}
+
+/**
+ * Implementation of ike_sa_id_t.switch_initiator.
+ */
+static bool switch_initiator(private_ike_sa_id_t *this)
+{
+	if (this->is_initiator_flag)
+	{
+		this->is_initiator_flag = FALSE;
+	}
+	else
+	{
+		this->is_initiator_flag = TRUE;
+	}
+	return this->is_initiator_flag;
+}
+
+/**
+ * Implementation of ike_sa_id_t.clone.
+ */
+static ike_sa_id_t* clone_(private_ike_sa_id_t *this)
+{
+	return ike_sa_id_create(this->initiator_spi, this->responder_spi, this->is_initiator_flag);
+}
+
+/**
+ * Implementation of ike_sa_id_t.destroy.
+ */
+static void destroy(private_ike_sa_id_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_sa_id_t * ike_sa_id_create(u_int64_t initiator_spi, u_int64_t responder_spi, bool is_initiator_flag)
+{
+	private_ike_sa_id_t *this = malloc_thing(private_ike_sa_id_t);
+
+	/* public functions */
+	this->public.set_responder_spi = (void(*)(ike_sa_id_t*,u_int64_t)) set_responder_spi;
+	this->public.set_initiator_spi = (void(*)(ike_sa_id_t*,u_int64_t)) set_initiator_spi;
+	this->public.get_responder_spi = (u_int64_t(*)(ike_sa_id_t*)) get_responder_spi;
+	this->public.get_initiator_spi = (u_int64_t(*)(ike_sa_id_t*)) get_initiator_spi;
+	this->public.equals = (bool(*)(ike_sa_id_t*,ike_sa_id_t*)) equals;
+	this->public.replace_values = (void(*)(ike_sa_id_t*,ike_sa_id_t*)) replace_values;
+	this->public.is_initiator = (bool(*)(ike_sa_id_t*)) is_initiator;
+	this->public.switch_initiator = (bool(*)(ike_sa_id_t*)) switch_initiator;
+	this->public.clone = (ike_sa_id_t*(*)(ike_sa_id_t*)) clone_;
+	this->public.destroy = (void(*)(ike_sa_id_t*))destroy;
+
+	/* private data */
+	this->initiator_spi = initiator_spi;
+	this->responder_spi = responder_spi;
+	this->is_initiator_flag = is_initiator_flag;
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/ike_sa_id.h b/src/libcharon/sa/ike_sa_id.h
new file mode 100644
index 000000000..a833aa9d6
--- /dev/null
+++ b/src/libcharon/sa/ike_sa_id.h
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2005-2006 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_sa_id ike_sa_id
+ * @{ @ingroup sa
+ */
+
+#ifndef IKE_SA_ID_H_
+#define IKE_SA_ID_H_
+
+typedef struct ike_sa_id_t ike_sa_id_t;
+
+#include <library.h>
+
+/**
+ * An object of type ike_sa_id_t is used to identify an IKE_SA.
+ *
+ * An IKE_SA is identified by its initiator and responder spi's.
+ * Additionaly it contains the role of the actual running IKEv2-Daemon
+ * for the specific IKE_SA (original initiator or responder).
+ */
+struct ike_sa_id_t {
+
+	/**
+	 * Set the SPI of the responder.
+	 *
+	 * This function is called when a request or reply of a IKE_SA_INIT is received.
+	 *
+	 * @param responder_spi 	SPI of responder to set
+	 */
+	void (*set_responder_spi) (ike_sa_id_t *this, u_int64_t responder_spi);
+
+	/**
+	 * Set the SPI of the initiator.
+	 *
+	 * @param initiator_spi 	SPI to set
+	 */
+	void (*set_initiator_spi) (ike_sa_id_t *this, u_int64_t initiator_spi);
+
+	/**
+	 * Get the initiator SPI.
+	 *
+	 * @return 					SPI of the initiator
+	 */
+	u_int64_t (*get_initiator_spi) (ike_sa_id_t *this);
+
+	/**
+	 * Get the responder SPI.
+	 *
+	 * @return 					SPI of the responder
+	 */
+	u_int64_t (*get_responder_spi) (ike_sa_id_t *this);
+
+	/**
+	 * Check if two ike_sa_id_t objects are equal.
+	 *
+	 * Two ike_sa_id_t objects are equal if both SPI values and the role matches.
+	 *
+	 * @param other 			ike_sa_id_t object to check if equal
+	 * @return 					TRUE if given ike_sa_id_t are equal, FALSE otherwise
+	 */
+	bool (*equals) (ike_sa_id_t *this, ike_sa_id_t *other);
+
+	/**
+	 * Replace all values of a given ike_sa_id_t object with values.
+	 * from another ike_sa_id_t object.
+	 *
+	 * After calling this function, both objects are equal.
+	 *
+	 * @param other 			ike_sa_id_t object from which values will be taken
+	 */
+	void (*replace_values) (ike_sa_id_t *this, ike_sa_id_t *other);
+
+	/**
+	 * Get the initiator flag.
+	 *
+	 * @return 					TRUE if we are the original initator
+	 */
+	bool (*is_initiator) (ike_sa_id_t *this);
+
+	/**
+	 * Switche the original initiator flag.
+	 *
+	 * @return 					TRUE if we are the original initator after switch, FALSE otherwise
+	 */
+	bool (*switch_initiator) (ike_sa_id_t *this);
+
+	/**
+	 * Clones a given ike_sa_id_t object.
+	 *
+	 * @return 					cloned ike_sa_id_t object
+	 */
+	ike_sa_id_t *(*clone) (ike_sa_id_t *this);
+
+	/**
+	 * Destroys an ike_sa_id_t object.
+	 */
+	void (*destroy) (ike_sa_id_t *this);
+};
+
+/**
+ * Creates an ike_sa_id_t object with specific SPI's and defined role.
+ *
+ * @param initiator_spi			initiators SPI
+ * @param responder_spi			responders SPI
+ * @param is_initiaor			TRUE if we are the original initiator
+ * @return						ike_sa_id_t object
+ */
+ike_sa_id_t * ike_sa_id_create(u_int64_t initiator_spi, u_int64_t responder_spi,
+							   bool is_initiaor);
+
+#endif /** IKE_SA_ID_H_ @}*/
diff --git a/src/libcharon/sa/ike_sa_manager.c b/src/libcharon/sa/ike_sa_manager.c
new file mode 100644
index 000000000..3ef0f3bb0
--- /dev/null
+++ b/src/libcharon/sa/ike_sa_manager.c
@@ -0,0 +1,1741 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2005-2008 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include <string.h>
+
+#include "ike_sa_manager.h"
+
+#include <daemon.h>
+#include <sa/ike_sa_id.h>
+#include <bus/bus.h>
+#include <threading/condvar.h>
+#include <threading/mutex.h>
+#include <threading/rwlock.h>
+#include <utils/linked_list.h>
+#include <crypto/hashers/hasher.h>
+
+/* the default size of the hash table (MUST be a power of 2) */
+#define DEFAULT_HASHTABLE_SIZE 1
+
+/* the maximum size of the hash table (MUST be a power of 2) */
+#define MAX_HASHTABLE_SIZE (1 << 30)
+
+/* the default number of segments (MUST be a power of 2) */
+#define DEFAULT_SEGMENT_COUNT 1
+
+typedef struct entry_t entry_t;
+
+/**
+ * An entry in the linked list, contains IKE_SA, locking and lookup data.
+ */
+struct entry_t {
+
+	/**
+	 * Number of threads waiting for this ike_sa_t object.
+	 */
+	int waiting_threads;
+
+	/**
+	 * Condvar where threads can wait until ike_sa_t object is free for use again.
+	 */
+	condvar_t *condvar;
+
+	/**
+	 * Is this ike_sa currently checked out?
+	 */
+	bool checked_out;
+
+	/**
+	 * Does this SA drives out new threads?
+	 */
+	bool driveout_new_threads;
+
+	/**
+	 * Does this SA drives out waiting threads?
+	 */
+	bool driveout_waiting_threads;
+
+	/**
+	 * Identification of an IKE_SA (SPIs).
+	 */
+	ike_sa_id_t *ike_sa_id;
+
+	/**
+	 * The contained ike_sa_t object.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * hash of the IKE_SA_INIT message, used to detect retransmissions
+	 */
+	chunk_t init_hash;
+
+	/**
+	 * remote host address, required for DoS detection
+	 */
+	host_t *other;
+
+	/**
+	 * As responder: Is this SA half-open?
+	 */
+	bool half_open;
+
+	/**
+	 * own identity, required for duplicate checking
+	 */
+	identification_t *my_id;
+
+	/**
+	 * remote identity, required for duplicate checking
+	 */
+	identification_t *other_id;
+
+	/**
+	 * message ID currently processing, if any
+	 */
+	u_int32_t message_id;
+};
+
+/**
+ * Implementation of entry_t.destroy.
+ */
+static status_t entry_destroy(entry_t *this)
+{
+	/* also destroy IKE SA */
+	this->ike_sa->destroy(this->ike_sa);
+	this->ike_sa_id->destroy(this->ike_sa_id);
+	chunk_free(&this->init_hash);
+	DESTROY_IF(this->other);
+	DESTROY_IF(this->my_id);
+	DESTROY_IF(this->other_id);
+	this->condvar->destroy(this->condvar);
+	free(this);
+	return SUCCESS;
+}
+
+/**
+ * Creates a new entry for the ike_sa_t list.
+ */
+static entry_t *entry_create()
+{
+	entry_t *this = malloc_thing(entry_t);
+
+	this->waiting_threads = 0;
+	this->condvar = condvar_create(CONDVAR_TYPE_DEFAULT);
+
+	/* we set checkout flag when we really give it out */
+	this->checked_out = FALSE;
+	this->driveout_new_threads = FALSE;
+	this->driveout_waiting_threads = FALSE;
+	this->message_id = -1;
+	this->init_hash = chunk_empty;
+	this->other = NULL;
+	this->half_open = FALSE;
+	this->my_id = NULL;
+	this->other_id = NULL;
+	this->ike_sa_id = NULL;
+	this->ike_sa = NULL;
+
+	return this;
+}
+
+/**
+ * Function that matches entry_t objects by initiator SPI and the hash of the
+ * IKE_SA_INIT message.
+ */
+static bool entry_match_by_hash(entry_t *entry, ike_sa_id_t *id, chunk_t *hash)
+{
+	return id->get_responder_spi(id) == 0 &&
+		id->is_initiator(id) == entry->ike_sa_id->is_initiator(entry->ike_sa_id) &&
+		id->get_initiator_spi(id) == entry->ike_sa_id->get_initiator_spi(entry->ike_sa_id) &&
+		chunk_equals(*hash, entry->init_hash);
+}
+
+/**
+ * Function that matches entry_t objects by ike_sa_id_t.
+ */
+static bool entry_match_by_id(entry_t *entry, ike_sa_id_t *id)
+{
+	if (id->equals(id, entry->ike_sa_id))
+	{
+		return TRUE;
+	}
+	if ((id->get_responder_spi(id) == 0 ||
+		 entry->ike_sa_id->get_responder_spi(entry->ike_sa_id) == 0) &&
+		id->is_initiator(id) == entry->ike_sa_id->is_initiator(entry->ike_sa_id) &&
+		id->get_initiator_spi(id) == entry->ike_sa_id->get_initiator_spi(entry->ike_sa_id))
+	{
+		/* this is TRUE for IKE_SAs that we initiated but have not yet received a response */
+		return TRUE;
+	}
+	return FALSE;
+}
+
+/**
+ * Function that matches entry_t objects by ike_sa_t pointers.
+ */
+static bool entry_match_by_sa(entry_t *entry, ike_sa_t *ike_sa)
+{
+	return entry->ike_sa == ike_sa;
+}
+
+/**
+ * Hash function for ike_sa_id_t objects.
+ */
+static u_int ike_sa_id_hash(ike_sa_id_t *ike_sa_id)
+{
+	/* we always use initiator spi as key */
+	return ike_sa_id->get_initiator_spi(ike_sa_id);
+}
+
+typedef struct half_open_t half_open_t;
+
+/**
+ * Struct to manage half-open IKE_SAs per peer.
+ */
+struct half_open_t {
+	/** chunk of remote host address */
+	chunk_t other;
+
+	/** the number of half-open IKE_SAs with that host */
+	u_int count;
+};
+
+/**
+ * Destroys a half_open_t object.
+ */
+static void half_open_destroy(half_open_t *this)
+{
+	chunk_free(&this->other);
+	free(this);
+}
+
+/**
+ * Function that matches half_open_t objects by the given IP address chunk.
+ */
+static bool half_open_match(half_open_t *half_open, chunk_t *addr)
+{
+	return chunk_equals(*addr, half_open->other);
+}
+
+typedef struct connected_peers_t connected_peers_t;
+
+struct connected_peers_t {
+	/** own identity */
+	identification_t *my_id;
+
+	/** remote identity */
+	identification_t *other_id;
+
+	/** list of ike_sa_id_t objects of IKE_SAs between the two identities */
+	linked_list_t *sas;
+};
+
+static void connected_peers_destroy(connected_peers_t *this)
+{
+	this->my_id->destroy(this->my_id);
+	this->other_id->destroy(this->other_id);
+	this->sas->destroy(this->sas);
+	free(this);
+}
+
+/**
+ * Function that matches connected_peers_t objects by the given ids.
+ */
+static bool connected_peers_match(connected_peers_t *connected_peers,
+							identification_t *my_id, identification_t *other_id)
+{
+	return my_id->equals(my_id, connected_peers->my_id) &&
+		   other_id->equals(other_id, connected_peers->other_id);
+}
+
+typedef struct segment_t segment_t;
+
+/**
+ * Struct to manage segments of the hash table.
+ */
+struct segment_t {
+	/** mutex to access a segment exclusively */
+	mutex_t *mutex;
+
+	/** the number of entries in this segment */
+	u_int count;
+};
+
+typedef struct shareable_segment_t shareable_segment_t;
+
+/**
+ * Struct to manage segments of the "half-open" and "connected peers" hash tables.
+ */
+struct shareable_segment_t {
+	/** rwlock to access a segment non-/exclusively */
+	rwlock_t *lock;
+
+	/** the number of entries in this segment - in case of the "half-open table"
+	 * it's the sum of all half_open_t.count in a segment. */
+	u_int count;
+};
+
+typedef struct private_ike_sa_manager_t private_ike_sa_manager_t;
+
+/**
+ * Additional private members of ike_sa_manager_t.
+ */
+struct private_ike_sa_manager_t {
+	/**
+	 * Public interface of ike_sa_manager_t.
+	 */
+	 ike_sa_manager_t public;
+
+	 /**
+	  * Hash table with entries for the ike_sa_t objects.
+	  */
+	 linked_list_t **ike_sa_table;
+
+	 /**
+	  * The size of the hash table.
+	  */
+	 u_int table_size;
+
+	 /**
+	  * Mask to map the hashes to table rows.
+	  */
+	 u_int table_mask;
+
+	 /**
+	  * Segments of the hash table.
+	  */
+	 segment_t *segments;
+
+	 /**
+	  * The number of segments.
+	  */
+	 u_int segment_count;
+
+	 /**
+	  * Mask to map a table row to a segment.
+	  */
+	 u_int segment_mask;
+
+	 /**
+	  * Hash table with half_open_t objects.
+	  */
+	 linked_list_t **half_open_table;
+
+	 /**
+	  * Segments of the "half-open" hash table.
+	  */
+	 shareable_segment_t *half_open_segments;
+
+	 /**
+	  * Hash table with connected_peers_t objects.
+	  */
+	 linked_list_t **connected_peers_table;
+
+	 /**
+	  * Segments of the "connected peers" hash table.
+	  */
+	 shareable_segment_t *connected_peers_segments;
+
+	 /**
+	  * RNG to get random SPIs for our side
+	  */
+	 rng_t *rng;
+
+	 /**
+	  * SHA1 hasher for IKE_SA_INIT retransmit detection
+	  */
+	 hasher_t *hasher;
+
+	/**
+	 * reuse existing IKE_SAs in checkout_by_config
+	 */
+	 bool reuse_ikesa;
+};
+
+/**
+ * Acquire a lock to access the segment of the table row with the given index.
+ * It also works with the segment index directly.
+ */
+static void lock_single_segment(private_ike_sa_manager_t *this, u_int index)
+{
+	mutex_t *lock = this->segments[index & this->segment_mask].mutex;
+
+	lock->lock(lock);
+}
+
+/**
+ * Release the lock required to access the segment of the table row with the given index.
+ * It also works with the segment index directly.
+ */
+static void unlock_single_segment(private_ike_sa_manager_t *this, u_int index)
+{
+	mutex_t *lock = this->segments[index & this->segment_mask].mutex;
+
+	lock->unlock(lock);
+}
+
+/**
+ * Lock all segments
+ */
+static void lock_all_segments(private_ike_sa_manager_t *this)
+{
+	u_int i;
+
+	for (i = 0; i < this->segment_count; ++i)
+	{
+		this->segments[i].mutex->lock(this->segments[i].mutex);
+	}
+}
+
+/**
+ * Unlock all segments
+ */
+static void unlock_all_segments(private_ike_sa_manager_t *this)
+{
+	u_int i;
+
+	for (i = 0; i < this->segment_count; ++i)
+	{
+		this->segments[i].mutex->unlock(this->segments[i].mutex);
+	}
+}
+
+typedef struct private_enumerator_t private_enumerator_t;
+
+/**
+ * hash table enumerator implementation
+ */
+struct private_enumerator_t {
+
+	/**
+	 * implements enumerator interface
+	 */
+	enumerator_t enumerator;
+
+	/**
+	 * associated ike_sa_manager_t
+	 */
+	private_ike_sa_manager_t *manager;
+
+	/**
+	 * current segment index
+	 */
+	u_int segment;
+
+	/**
+	 * currently enumerating entry
+	 */
+	entry_t *entry;
+
+	/**
+	 * current table row index
+	 */
+	u_int row;
+
+	/**
+	 * enumerator for the current table row
+	 */
+	enumerator_t *current;
+};
+
+/**
+ * Implementation of private_enumerator_t.enumerator.enumerate.
+ */
+static bool enumerate(private_enumerator_t *this, entry_t **entry, u_int *segment)
+{
+	if (this->entry)
+	{
+		this->entry->condvar->signal(this->entry->condvar);
+		this->entry = NULL;
+	}
+	while (this->segment < this->manager->segment_count)
+	{
+		while (this->row < this->manager->table_size)
+		{
+			if (this->current)
+			{
+				entry_t *item;
+
+				if (this->current->enumerate(this->current, &item))
+				{
+					*entry = this->entry = item;
+					*segment = this->segment;
+					return TRUE;
+				}
+				this->current->destroy(this->current);
+				this->current = NULL;
+				unlock_single_segment(this->manager, this->segment);
+			}
+			else
+			{
+				linked_list_t *list;
+
+				lock_single_segment(this->manager, this->segment);
+				if ((list = this->manager->ike_sa_table[this->row]) != NULL &&
+					 list->get_count(list))
+				{
+					this->current = list->create_enumerator(list);
+					continue;
+				}
+				unlock_single_segment(this->manager, this->segment);
+			}
+			this->row += this->manager->segment_count;
+		}
+		this->segment++;
+		this->row = this->segment;
+	}
+	return FALSE;
+}
+
+/**
+ * Implementation of private_enumerator_t.enumerator.destroy.
+ */
+static void enumerator_destroy(private_enumerator_t *this)
+{
+	if (this->entry)
+	{
+		this->entry->condvar->signal(this->entry->condvar);
+	}
+	if (this->current)
+	{
+		this->current->destroy(this->current);
+		unlock_single_segment(this->manager, this->segment);
+	}
+	free(this);
+}
+
+/**
+ * Creates an enumerator to enumerate the entries in the hash table.
+ */
+static enumerator_t* create_table_enumerator(private_ike_sa_manager_t *this)
+{
+	private_enumerator_t *enumerator = malloc_thing(private_enumerator_t);
+
+	enumerator->enumerator.enumerate = (void*)enumerate;
+	enumerator->enumerator.destroy = (void*)enumerator_destroy;
+	enumerator->manager = this;
+	enumerator->segment = 0;
+	enumerator->entry = NULL;
+	enumerator->row = 0;
+	enumerator->current = NULL;
+
+	return &enumerator->enumerator;
+}
+
+/**
+ * Put an entry into the hash table.
+ * Note: The caller has to unlock the returned segment.
+ */
+static u_int put_entry(private_ike_sa_manager_t *this, entry_t *entry)
+{
+	linked_list_t *list;
+	u_int row = ike_sa_id_hash(entry->ike_sa_id) & this->table_mask;
+	u_int segment = row & this->segment_mask;
+
+	lock_single_segment(this, segment);
+	if ((list = this->ike_sa_table[row]) == NULL)
+	{
+		list = this->ike_sa_table[row] = linked_list_create();
+	}
+	list->insert_last(list, entry);
+	this->segments[segment].count++;
+	return segment;
+}
+
+/**
+ * Remove an entry from the hash table.
+ * Note: The caller MUST have a lock on the segment of this entry.
+ */
+static void remove_entry(private_ike_sa_manager_t *this, entry_t *entry)
+{
+	linked_list_t *list;
+	u_int row = ike_sa_id_hash(entry->ike_sa_id) & this->table_mask;
+	u_int segment = row & this->segment_mask;
+
+	if ((list = this->ike_sa_table[row]) != NULL)
+	{
+		entry_t *current;
+
+		enumerator_t *enumerator = list->create_enumerator(list);
+		while (enumerator->enumerate(enumerator, &current))
+		{
+			if (current == entry)
+			{
+				list->remove_at(list, enumerator);
+				this->segments[segment].count--;
+				break;
+			}
+		}
+		enumerator->destroy(enumerator);
+	}
+}
+
+/**
+ * Remove the entry at the current enumerator position.
+ */
+static void remove_entry_at(private_enumerator_t *this)
+{
+	this->entry = NULL;
+	if (this->current)
+	{
+		linked_list_t *list = this->manager->ike_sa_table[this->row];
+		list->remove_at(list, this->current);
+		this->manager->segments[this->segment].count--;
+	}
+}
+
+/**
+ * Find an entry using the provided match function to compare the entries for
+ * equality.
+ */
+static status_t get_entry_by_match_function(private_ike_sa_manager_t *this,
+					ike_sa_id_t *ike_sa_id, entry_t **entry, u_int *segment,
+					linked_list_match_t match, void *p1, void *p2)
+{
+	entry_t *current;
+	linked_list_t *list;
+	u_int row = ike_sa_id_hash(ike_sa_id) & this->table_mask;
+	u_int seg = row & this->segment_mask;
+
+	lock_single_segment(this, seg);
+	if ((list = this->ike_sa_table[row]) != NULL)
+	{
+		if (list->find_first(list, match, (void**)&current, p1, p2) == SUCCESS)
+		{
+			*entry = current;
+			*segment = seg;
+			/* the locked segment has to be unlocked by the caller */
+			return SUCCESS;
+		}
+	}
+	unlock_single_segment(this, seg);
+	return NOT_FOUND;
+}
+
+/**
+ * Find an entry by ike_sa_id_t.
+ * Note: On SUCCESS, the caller has to unlock the segment.
+ */
+static status_t get_entry_by_id(private_ike_sa_manager_t *this,
+						ike_sa_id_t *ike_sa_id, entry_t **entry, u_int *segment)
+{
+	return get_entry_by_match_function(this, ike_sa_id, entry, segment,
+				(linked_list_match_t)entry_match_by_id, ike_sa_id, NULL);
+}
+
+/**
+ * Find an entry by initiator SPI and IKE_SA_INIT hash.
+ * Note: On SUCCESS, the caller has to unlock the segment.
+ */
+static status_t get_entry_by_hash(private_ike_sa_manager_t *this,
+			ike_sa_id_t *ike_sa_id, chunk_t hash, entry_t **entry, u_int *segment)
+{
+	return get_entry_by_match_function(this, ike_sa_id, entry, segment,
+				(linked_list_match_t)entry_match_by_hash, ike_sa_id, &hash);
+}
+
+/**
+ * Find an entry by IKE_SA pointer.
+ * Note: On SUCCESS, the caller has to unlock the segment.
+ */
+static status_t get_entry_by_sa(private_ike_sa_manager_t *this,
+			ike_sa_id_t *ike_sa_id, ike_sa_t *ike_sa, entry_t **entry, u_int *segment)
+{
+	return get_entry_by_match_function(this, ike_sa_id, entry, segment,
+				(linked_list_match_t)entry_match_by_sa, ike_sa, NULL);
+}
+
+/**
+ * Wait until no other thread is using an IKE_SA, return FALSE if entry not
+ * acquirable.
+ */
+static bool wait_for_entry(private_ike_sa_manager_t *this, entry_t *entry,
+						   u_int segment)
+{
+	if (entry->driveout_new_threads)
+	{
+		/* we are not allowed to get this */
+		return FALSE;
+	}
+	while (entry->checked_out && !entry->driveout_waiting_threads)
+	{
+		/* so wait until we can get it for us.
+		 * we register us as waiting. */
+		entry->waiting_threads++;
+		entry->condvar->wait(entry->condvar, this->segments[segment].mutex);
+		entry->waiting_threads--;
+	}
+	/* hm, a deletion request forbids us to get this SA, get next one */
+	if (entry->driveout_waiting_threads)
+	{
+		/* we must signal here, others may be waiting on it, too */
+		entry->condvar->signal(entry->condvar);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+/**
+ * Put a half-open SA into the hash table.
+ */
+static void put_half_open(private_ike_sa_manager_t *this, entry_t *entry)
+{
+	half_open_t *half_open = NULL;
+	linked_list_t *list;
+	chunk_t addr = entry->other->get_address(entry->other);
+	u_int row = chunk_hash(addr) & this->table_mask;
+	u_int segment = row & this->segment_mask;
+
+	rwlock_t *lock = this->half_open_segments[segment].lock;
+	lock->write_lock(lock);
+	if ((list = this->half_open_table[row]) == NULL)
+	{
+		list = this->half_open_table[row] = linked_list_create();
+	}
+	else
+	{
+		half_open_t *current;
+		if (list->find_first(list, (linked_list_match_t)half_open_match,
+							 (void**)&current, &addr) == SUCCESS)
+		{
+			half_open = current;
+			half_open->count++;
+			this->half_open_segments[segment].count++;
+		}
+	}
+
+	if (!half_open)
+	{
+		half_open = malloc_thing(half_open_t);
+		half_open->other = chunk_clone(addr);
+		half_open->count = 1;
+		list->insert_last(list, half_open);
+		this->half_open_segments[segment].count++;
+	}
+	lock->unlock(lock);
+}
+
+/**
+ * Remove a half-open SA from the hash table.
+ */
+static void remove_half_open(private_ike_sa_manager_t *this, entry_t *entry)
+{
+	linked_list_t *list;
+	chunk_t addr = entry->other->get_address(entry->other);
+	u_int row = chunk_hash(addr) & this->table_mask;
+	u_int segment = row & this->segment_mask;
+
+	rwlock_t *lock = this->half_open_segments[segment].lock;
+	lock->write_lock(lock);
+	if ((list = this->half_open_table[row]) != NULL)
+	{
+		half_open_t *current;
+		enumerator_t *enumerator = list->create_enumerator(list);
+		while (enumerator->enumerate(enumerator, &current))
+		{
+			if (half_open_match(current, &addr))
+			{
+				if (--current->count == 0)
+				{
+					list->remove_at(list, enumerator);
+					half_open_destroy(current);
+				}
+				this->half_open_segments[segment].count--;
+				break;
+			}
+		}
+		enumerator->destroy(enumerator);
+	}
+	lock->unlock(lock);
+}
+
+/**
+ * Put an SA between two peers into the hash table.
+ */
+static void put_connected_peers(private_ike_sa_manager_t *this, entry_t *entry)
+{
+	linked_list_t *list;
+	connected_peers_t *connected_peers = NULL;
+	chunk_t my_id = entry->my_id->get_encoding(entry->my_id),
+			other_id = entry->other_id->get_encoding(entry->other_id);
+	u_int row = chunk_hash_inc(other_id, chunk_hash(my_id)) & this->table_mask;
+	u_int segment = row & this->segment_mask;
+
+	rwlock_t *lock = this->connected_peers_segments[segment].lock;
+	lock->write_lock(lock);
+	if ((list = this->connected_peers_table[row]) == NULL)
+	{
+		list = this->connected_peers_table[row] = linked_list_create();
+	}
+	else
+	{
+		connected_peers_t *current;
+		if (list->find_first(list, (linked_list_match_t)connected_peers_match,
+					(void**)&current, entry->my_id, entry->other_id) == SUCCESS)
+		{
+			connected_peers = current;
+			if (connected_peers->sas->find_first(connected_peers->sas,
+					(linked_list_match_t)entry->ike_sa_id->equals,
+					NULL, entry->ike_sa_id) == SUCCESS)
+			{
+				lock->unlock(lock);
+				return;
+			}
+		}
+	}
+
+	if (!connected_peers)
+	{
+		connected_peers = malloc_thing(connected_peers_t);
+		connected_peers->my_id = entry->my_id->clone(entry->my_id);
+		connected_peers->other_id = entry->other_id->clone(entry->other_id);
+		connected_peers->sas = linked_list_create();
+		list->insert_last(list, connected_peers);
+	}
+	connected_peers->sas->insert_last(connected_peers->sas,
+									  entry->ike_sa_id->clone(entry->ike_sa_id));
+	this->connected_peers_segments[segment].count++;
+	lock->unlock(lock);
+}
+
+/**
+ * Remove an SA between two peers from the hash table.
+ */
+static void remove_connected_peers(private_ike_sa_manager_t *this, entry_t *entry)
+{
+	linked_list_t *list;
+	chunk_t my_id = entry->my_id->get_encoding(entry->my_id),
+			other_id = entry->other_id->get_encoding(entry->other_id);
+	u_int row = chunk_hash_inc(other_id, chunk_hash(my_id)) & this->table_mask;
+	u_int segment = row & this->segment_mask;
+
+	rwlock_t *lock = this->connected_peers_segments[segment].lock;
+	lock->write_lock(lock);
+	if ((list = this->connected_peers_table[row]) != NULL)
+	{
+		connected_peers_t *current;
+		enumerator_t *enumerator = list->create_enumerator(list);
+		while (enumerator->enumerate(enumerator, &current))
+		{
+			if (connected_peers_match(current, entry->my_id, entry->other_id))
+			{
+				ike_sa_id_t *ike_sa_id;
+				enumerator_t *inner = current->sas->create_enumerator(current->sas);
+				while (inner->enumerate(inner, &ike_sa_id))
+				{
+					if (ike_sa_id->equals(ike_sa_id, entry->ike_sa_id))
+					{
+						current->sas->remove_at(current->sas, inner);
+						ike_sa_id->destroy(ike_sa_id);
+						this->connected_peers_segments[segment].count--;
+						break;
+					}
+				}
+				inner->destroy(inner);
+				if (current->sas->get_count(current->sas) == 0)
+				{
+					list->remove_at(list, enumerator);
+					connected_peers_destroy(current);
+				}
+				break;
+			}
+		}
+		enumerator->destroy(enumerator);
+	}
+	lock->unlock(lock);
+}
+
+/**
+ * Implementation of private_ike_sa_manager_t.get_next_spi.
+ */
+static u_int64_t get_next_spi(private_ike_sa_manager_t *this)
+{
+	u_int64_t spi;
+
+	this->rng->get_bytes(this->rng, sizeof(spi), (u_int8_t*)&spi);
+	return spi;
+}
+
+/**
+ * Implementation of of ike_sa_manager.checkout.
+ */
+static ike_sa_t* checkout(private_ike_sa_manager_t *this, ike_sa_id_t *ike_sa_id)
+{
+	ike_sa_t *ike_sa = NULL;
+	entry_t *entry;
+	u_int segment;
+
+	DBG2(DBG_MGR, "checkout IKE_SA");
+
+	if (get_entry_by_id(this, ike_sa_id, &entry, &segment) == SUCCESS)
+	{
+		if (wait_for_entry(this, entry, segment))
+		{
+			DBG2(DBG_MGR, "IKE_SA successfully checked out");
+			entry->checked_out = TRUE;
+			ike_sa = entry->ike_sa;
+		}
+		unlock_single_segment(this, segment);
+	}
+	charon->bus->set_sa(charon->bus, ike_sa);
+	return ike_sa;
+}
+
+/**
+ * Implementation of of ike_sa_manager.checkout_new.
+ */
+static ike_sa_t *checkout_new(private_ike_sa_manager_t* this, bool initiator)
+{
+	ike_sa_id_t *ike_sa_id;
+	ike_sa_t *ike_sa;
+	entry_t *entry;
+	u_int segment;
+
+	if (initiator)
+	{
+		ike_sa_id = ike_sa_id_create(get_next_spi(this), 0, TRUE);
+	}
+	else
+	{
+		ike_sa_id = ike_sa_id_create(0, get_next_spi(this), FALSE);
+	}
+	ike_sa = ike_sa_create(ike_sa_id);
+
+	DBG2(DBG_MGR, "created IKE_SA");
+
+	if (!initiator)
+	{
+		ike_sa_id->destroy(ike_sa_id);
+		return ike_sa;
+	}
+
+	entry = entry_create();
+	entry->ike_sa_id = ike_sa_id;
+	entry->ike_sa = ike_sa;
+	segment = put_entry(this, entry);
+	entry->checked_out = TRUE;
+	unlock_single_segment(this, segment);
+	return entry->ike_sa;
+}
+
+/**
+ * Implementation of of ike_sa_manager.checkout_by_message.
+ */
+static ike_sa_t* checkout_by_message(private_ike_sa_manager_t* this,
+									 message_t *message)
+{
+	u_int segment;
+	entry_t *entry;
+	ike_sa_t *ike_sa = NULL;
+	ike_sa_id_t *id = message->get_ike_sa_id(message);
+
+	id = id->clone(id);
+	id->switch_initiator(id);
+
+	DBG2(DBG_MGR, "checkout IKE_SA by message");
+
+	if (message->get_request(message) &&
+		message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		/* IKE_SA_INIT request. Check for an IKE_SA with such a message hash. */
+		chunk_t data, hash;
+
+		data = message->get_packet_data(message);
+		this->hasher->allocate_hash(this->hasher, data, &hash);
+		chunk_free(&data);
+
+		if (get_entry_by_hash(this, id, hash, &entry, &segment) == SUCCESS)
+		{
+			if (entry->message_id == 0)
+			{
+				unlock_single_segment(this, segment);
+				chunk_free(&hash);
+				id->destroy(id);
+				DBG1(DBG_MGR, "ignoring IKE_SA_INIT, already processing");
+				return NULL;
+			}
+			else if (wait_for_entry(this, entry, segment))
+			{
+				DBG2(DBG_MGR, "IKE_SA checked out by hash");
+				entry->checked_out = TRUE;
+				entry->message_id = message->get_message_id(message);
+				ike_sa = entry->ike_sa;
+			}
+			unlock_single_segment(this, segment);
+		}
+
+		if (ike_sa == NULL)
+		{
+			if (id->get_responder_spi(id) == 0 &&
+				message->get_exchange_type(message) == IKE_SA_INIT)
+			{
+				/* no IKE_SA found, create a new one */
+				id->set_responder_spi(id, get_next_spi(this));
+				entry = entry_create();
+				entry->ike_sa = ike_sa_create(id);
+				entry->ike_sa_id = id->clone(id);
+
+				segment = put_entry(this, entry);
+				entry->checked_out = TRUE;
+				unlock_single_segment(this, segment);
+
+				entry->message_id = message->get_message_id(message);
+				entry->init_hash = hash;
+				ike_sa = entry->ike_sa;
+
+				DBG2(DBG_MGR, "created IKE_SA");
+			}
+			else
+			{
+				chunk_free(&hash);
+				DBG1(DBG_MGR, "ignoring message, no such IKE_SA");
+			}
+		}
+		else
+		{
+			chunk_free(&hash);
+		}
+		id->destroy(id);
+		charon->bus->set_sa(charon->bus, ike_sa);
+		return ike_sa;
+	}
+
+	if (get_entry_by_id(this, id, &entry, &segment) == SUCCESS)
+	{
+		/* only check out if we are not processing this request */
+		if (message->get_request(message) &&
+			message->get_message_id(message) == entry->message_id)
+		{
+			DBG1(DBG_MGR, "ignoring request with ID %d, already processing",
+				 entry->message_id);
+		}
+		else if (wait_for_entry(this, entry, segment))
+		{
+			ike_sa_id_t *ike_id = entry->ike_sa->get_id(entry->ike_sa);
+			DBG2(DBG_MGR, "IKE_SA successfully checked out");
+			entry->checked_out = TRUE;
+			entry->message_id = message->get_message_id(message);
+			if (ike_id->get_responder_spi(ike_id) == 0)
+			{
+				ike_id->set_responder_spi(ike_id, id->get_responder_spi(id));
+			}
+			ike_sa = entry->ike_sa;
+		}
+		unlock_single_segment(this, segment);
+	}
+	id->destroy(id);
+	charon->bus->set_sa(charon->bus, ike_sa);
+	return ike_sa;
+}
+
+/**
+ * Implementation of of ike_sa_manager.checkout_by_config.
+ */
+static ike_sa_t* checkout_by_config(private_ike_sa_manager_t *this,
+									peer_cfg_t *peer_cfg)
+{
+	enumerator_t *enumerator;
+	entry_t *entry;
+	ike_sa_t *ike_sa = NULL;
+	peer_cfg_t *current_peer;
+	ike_cfg_t *current_ike;
+	u_int segment;
+
+	if (!this->reuse_ikesa)
+	{	/* IKE_SA reuse disable by config */
+		ike_sa = checkout_new(this, TRUE);
+		charon->bus->set_sa(charon->bus, ike_sa);
+		return ike_sa;
+	}
+
+	enumerator = create_table_enumerator(this);
+	while (enumerator->enumerate(enumerator, &entry, &segment))
+	{
+		if (!wait_for_entry(this, entry, segment))
+		{
+			continue;
+		}
+		if (entry->ike_sa->get_state(entry->ike_sa) == IKE_DELETING)
+		{	/* skip IKE_SAs which are not usable */
+			continue;
+		}
+
+		current_peer = entry->ike_sa->get_peer_cfg(entry->ike_sa);
+		if (current_peer && current_peer->equals(current_peer, peer_cfg))
+		{
+			current_ike = current_peer->get_ike_cfg(current_peer);
+			if (current_ike->equals(current_ike, peer_cfg->get_ike_cfg(peer_cfg)))
+			{
+				DBG2(DBG_MGR, "found an existing IKE_SA with a '%s' config",
+					 current_peer->get_name(current_peer));
+				entry->checked_out = TRUE;
+				ike_sa = entry->ike_sa;
+				break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	if (!ike_sa)
+	{	/* no IKE_SA using such a config, hand out a new */
+		ike_sa = checkout_new(this, TRUE);
+	}
+	charon->bus->set_sa(charon->bus, ike_sa);
+	return ike_sa;
+}
+
+/**
+ * Implementation of of ike_sa_manager.checkout_by_id.
+ */
+static ike_sa_t* checkout_by_id(private_ike_sa_manager_t *this, u_int32_t id,
+								bool child)
+{
+	enumerator_t *enumerator;
+	iterator_t *children;
+	entry_t *entry;
+	ike_sa_t *ike_sa = NULL;
+	child_sa_t *child_sa;
+	u_int segment;
+
+	enumerator = create_table_enumerator(this);
+	while (enumerator->enumerate(enumerator, &entry, &segment))
+	{
+		if (wait_for_entry(this, entry, segment))
+		{
+			/* look for a child with such a reqid ... */
+			if (child)
+			{
+				children = entry->ike_sa->create_child_sa_iterator(entry->ike_sa);
+				while (children->iterate(children, (void**)&child_sa))
+				{
+					if (child_sa->get_reqid(child_sa) == id)
+					{
+						ike_sa = entry->ike_sa;
+						break;
+					}
+				}
+				children->destroy(children);
+			}
+			else /* ... or for a IKE_SA with such a unique id */
+			{
+				if (entry->ike_sa->get_unique_id(entry->ike_sa) == id)
+				{
+					ike_sa = entry->ike_sa;
+				}
+			}
+			/* got one, return */
+			if (ike_sa)
+			{
+				entry->checked_out = TRUE;
+				break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	charon->bus->set_sa(charon->bus, ike_sa);
+	return ike_sa;
+}
+
+/**
+ * Implementation of of ike_sa_manager.checkout_by_name.
+ */
+static ike_sa_t* checkout_by_name(private_ike_sa_manager_t *this, char *name,
+								  bool child)
+{
+	enumerator_t *enumerator;
+	iterator_t *children;
+	entry_t *entry;
+	ike_sa_t *ike_sa = NULL;
+	child_sa_t *child_sa;
+	u_int segment;
+
+	enumerator = create_table_enumerator(this);
+	while (enumerator->enumerate(enumerator, &entry, &segment))
+	{
+		if (wait_for_entry(this, entry, segment))
+		{
+			/* look for a child with such a policy name ... */
+			if (child)
+			{
+				children = entry->ike_sa->create_child_sa_iterator(entry->ike_sa);
+				while (children->iterate(children, (void**)&child_sa))
+				{
+					if (streq(child_sa->get_name(child_sa), name))
+					{
+						ike_sa = entry->ike_sa;
+						break;
+					}
+				}
+				children->destroy(children);
+			}
+			else /* ... or for a IKE_SA with such a connection name */
+			{
+				if (streq(entry->ike_sa->get_name(entry->ike_sa), name))
+				{
+					ike_sa = entry->ike_sa;
+				}
+			}
+			/* got one, return */
+			if (ike_sa)
+			{
+				entry->checked_out = TRUE;
+				break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	charon->bus->set_sa(charon->bus, ike_sa);
+	return ike_sa;
+}
+
+/**
+ * enumerator filter function
+ */
+static bool enumerator_filter(private_ike_sa_manager_t *this,
+							  entry_t **in, ike_sa_t **out, u_int *segment)
+{
+	if (wait_for_entry(this, *in, *segment))
+	{
+		*out = (*in)->ike_sa;
+		return TRUE;
+	}
+	return FALSE;
+}
+
+/**
+ * Implementation of ike_sa_manager_t.create_enumerator.
+ */
+static enumerator_t *create_enumerator(private_ike_sa_manager_t* this)
+{
+	return enumerator_create_filter(
+						create_table_enumerator(this),
+						(void*)enumerator_filter, this, NULL);
+}
+
+/**
+ * Implementation of ike_sa_manager_t.checkin.
+ */
+static void checkin(private_ike_sa_manager_t *this, ike_sa_t *ike_sa)
+{
+	/* to check the SA back in, we look for the pointer of the ike_sa
+	 * in all entries.
+	 * The lookup is done by initiator SPI, so even if the SPI has changed (e.g.
+	 * on reception of a IKE_SA_INIT response) the lookup will work but
+	 * updating of the SPI MAY be necessary...
+	 */
+	entry_t *entry;
+	ike_sa_id_t *ike_sa_id;
+	host_t *other;
+	identification_t *my_id, *other_id;
+	u_int segment;
+
+	ike_sa_id = ike_sa->get_id(ike_sa);
+	my_id = ike_sa->get_my_id(ike_sa);
+	other_id = ike_sa->get_other_id(ike_sa);
+	other = ike_sa->get_other_host(ike_sa);
+
+	DBG2(DBG_MGR, "checkin IKE_SA");
+
+	/* look for the entry */
+	if (get_entry_by_sa(this, ike_sa_id, ike_sa, &entry, &segment) == SUCCESS)
+	{
+		/* ike_sa_id must be updated */
+		entry->ike_sa_id->replace_values(entry->ike_sa_id, ike_sa->get_id(ike_sa));
+		/* signal waiting threads */
+		entry->checked_out = FALSE;
+		entry->message_id = -1;
+		/* check if this SA is half-open */
+		if (entry->half_open && ike_sa->get_state(ike_sa) != IKE_CONNECTING)
+		{
+			/* not half open anymore */
+			entry->half_open = FALSE;
+			remove_half_open(this, entry);
+		}
+		else if (entry->half_open && !other->ip_equals(other, entry->other))
+		{
+			/* the other host's IP has changed, we must update the hash table */
+			remove_half_open(this, entry);
+			DESTROY_IF(entry->other);
+			entry->other = other->clone(other);
+			put_half_open(this, entry);
+		}
+		else if (!entry->half_open &&
+				 !entry->ike_sa_id->is_initiator(entry->ike_sa_id) &&
+				 ike_sa->get_state(ike_sa) == IKE_CONNECTING)
+		{
+			/* this is a new half-open SA */
+			entry->half_open = TRUE;
+			entry->other = other->clone(other);
+			put_half_open(this, entry);
+		}
+		DBG2(DBG_MGR, "check-in of IKE_SA successful.");
+		entry->condvar->signal(entry->condvar);
+	}
+	else
+	{
+		entry = entry_create();
+		entry->ike_sa_id = ike_sa_id->clone(ike_sa_id);
+		entry->ike_sa = ike_sa;
+		segment = put_entry(this, entry);
+	}
+
+	/* apply identities for duplicate test (only as responder) */
+	if (!entry->ike_sa_id->is_initiator(entry->ike_sa_id) &&
+		ike_sa->get_state(ike_sa) == IKE_ESTABLISHED &&
+		entry->my_id == NULL && entry->other_id == NULL)
+	{
+		entry->my_id = my_id->clone(my_id);
+		entry->other_id = other_id->clone(other_id);
+		put_connected_peers(this, entry);
+	}
+
+	unlock_single_segment(this, segment);
+
+	charon->bus->set_sa(charon->bus, NULL);
+}
+
+/**
+ * Implementation of ike_sa_manager_t.checkin_and_destroy.
+ */
+static void checkin_and_destroy(private_ike_sa_manager_t *this, ike_sa_t *ike_sa)
+{
+	/* deletion is a bit complex, we must ensure that no thread is waiting for
+	 * this SA.
+	 * We take this SA from the table, and start signaling while threads
+	 * are in the condvar.
+	 */
+	entry_t *entry;
+	ike_sa_id_t *ike_sa_id;
+	u_int segment;
+
+	ike_sa_id = ike_sa->get_id(ike_sa);
+
+	DBG2(DBG_MGR, "checkin and destroy IKE_SA");
+
+	if (get_entry_by_sa(this, ike_sa_id, ike_sa, &entry, &segment) == SUCCESS)
+	{
+		/* drive out waiting threads, as we are in hurry */
+		entry->driveout_waiting_threads = TRUE;
+		/* mark it, so no new threads can get this entry */
+		entry->driveout_new_threads = TRUE;
+		/* wait until all workers have done their work */
+		while (entry->waiting_threads)
+		{
+			/* wake up all */
+			entry->condvar->broadcast(entry->condvar);
+			/* they will wake us again when their work is done */
+			entry->condvar->wait(entry->condvar, this->segments[segment].mutex);
+		}
+		remove_entry(this, entry);
+		unlock_single_segment(this, segment);
+
+		if (entry->half_open)
+		{
+			remove_half_open(this, entry);
+		}
+		if (!entry->ike_sa_id->is_initiator(entry->ike_sa_id) &&
+			entry->my_id && entry->other_id)
+		{
+			remove_connected_peers(this, entry);
+		}
+
+		entry_destroy(entry);
+
+		DBG2(DBG_MGR, "check-in and destroy of IKE_SA successful");
+	}
+	else
+	{
+		DBG1(DBG_MGR, "tried to check-in and delete nonexisting IKE_SA");
+		ike_sa->destroy(ike_sa);
+	}
+	charon->bus->set_sa(charon->bus, NULL);
+}
+
+
+/**
+ * Implementation of ike_sa_manager_t.check_uniqueness.
+ */
+static bool check_uniqueness(private_ike_sa_manager_t *this, ike_sa_t *ike_sa)
+{
+	bool cancel = FALSE;
+	peer_cfg_t *peer_cfg;
+	unique_policy_t policy;
+	linked_list_t *list, *duplicate_ids = NULL;
+	enumerator_t *enumerator;
+	ike_sa_id_t *duplicate_id = NULL;
+	identification_t *me, *other;
+	u_int row, segment;
+	rwlock_t *lock;
+
+	peer_cfg = ike_sa->get_peer_cfg(ike_sa);
+	policy = peer_cfg->get_unique_policy(peer_cfg);
+	if (policy == UNIQUE_NO)
+	{
+		return FALSE;
+	}
+
+	me = ike_sa->get_my_id(ike_sa);
+	other = ike_sa->get_other_id(ike_sa);
+
+	row = chunk_hash_inc(other->get_encoding(other),
+						 chunk_hash(me->get_encoding(me))) & this->table_mask;
+	segment = row & this->segment_mask;
+
+	lock = this->connected_peers_segments[segment & this->segment_mask].lock;
+	lock->read_lock(lock);
+	if ((list = this->connected_peers_table[row]) != NULL)
+	{
+		connected_peers_t *current;
+
+		if (list->find_first(list, (linked_list_match_t)connected_peers_match,
+							 (void**)&current, me, other) == SUCCESS)
+		{
+			/* clone the list, so we can release the lock */
+			duplicate_ids = current->sas->clone_offset(current->sas,
+												offsetof(ike_sa_id_t, clone));
+		}
+	}
+	lock->unlock(lock);
+
+	if (!duplicate_ids)
+	{
+		return FALSE;
+	}
+
+	enumerator = duplicate_ids->create_enumerator(duplicate_ids);
+	while (enumerator->enumerate(enumerator, &duplicate_id))
+	{
+		status_t status = SUCCESS;
+		ike_sa_t *duplicate;
+
+		duplicate = checkout(this, duplicate_id);
+		if (!duplicate)
+		{
+			continue;
+		}
+		peer_cfg = duplicate->get_peer_cfg(duplicate);
+		if (peer_cfg && peer_cfg->equals(peer_cfg, ike_sa->get_peer_cfg(ike_sa)))
+		{
+			switch (duplicate->get_state(duplicate))
+			{
+				case IKE_ESTABLISHED:
+				case IKE_REKEYING:
+					switch (policy)
+					{
+						case UNIQUE_REPLACE:
+							DBG1(DBG_IKE, "deleting duplicate IKE_SA for peer "
+									"'%Y' due to uniqueness policy", other);
+							status = duplicate->delete(duplicate);
+							break;
+						case UNIQUE_KEEP:
+							cancel = TRUE;
+							/* we keep the first IKE_SA and delete all
+							 * other duplicates that might exist */
+							policy = UNIQUE_REPLACE;
+							break;
+						default:
+							break;
+					}
+					break;
+				default:
+					break;
+			}
+		}
+		if (status == DESTROY_ME)
+		{
+			checkin_and_destroy(this, duplicate);
+		}
+		else
+		{
+			checkin(this, duplicate);
+		}
+	}
+	enumerator->destroy(enumerator);
+	duplicate_ids->destroy_offset(duplicate_ids, offsetof(ike_sa_id_t, destroy));
+	/* reset thread's current IKE_SA after checkin */
+	charon->bus->set_sa(charon->bus, ike_sa);
+	return cancel;
+}
+
+/**
+ * Implementation of ike_sa_manager_t.get_half_open_count.
+ */
+static int get_half_open_count(private_ike_sa_manager_t *this, host_t *ip)
+{
+	int count = 0;
+
+	if (ip)
+	{
+		linked_list_t *list;
+		chunk_t addr = ip->get_address(ip);
+		u_int row = chunk_hash(addr) & this->table_mask;
+		u_int segment = row & this->segment_mask;
+
+		rwlock_t *lock = this->half_open_segments[segment & this->segment_mask].lock;
+		lock->read_lock(lock);
+		if ((list = this->half_open_table[row]) != NULL)
+		{
+			half_open_t *current;
+
+			if (list->find_first(list, (linked_list_match_t)half_open_match,
+								 (void**)&current, &addr) == SUCCESS)
+			{
+				count = current->count;
+			}
+		}
+		lock->unlock(lock);
+	}
+	else
+	{
+		u_int segment;
+
+		for (segment = 0; segment < this->segment_count; ++segment)
+		{
+			rwlock_t *lock;
+			lock = this->half_open_segments[segment & this->segment_mask].lock;
+			lock->read_lock(lock);
+			count += this->half_open_segments[segment].count;
+			lock->unlock(lock);
+		}
+	}
+
+	return count;
+}
+
+/**
+ * Implementation of ike_sa_manager_t.flush.
+ */
+static void flush(private_ike_sa_manager_t *this)
+{
+	/* destroy all list entries */
+	enumerator_t *enumerator;
+	entry_t *entry;
+	u_int segment;
+
+	lock_all_segments(this);
+	DBG2(DBG_MGR, "going to destroy IKE_SA manager and all managed IKE_SA's");
+	/* Step 1: drive out all waiting threads  */
+	DBG2(DBG_MGR, "set driveout flags for all stored IKE_SA's");
+	enumerator = create_table_enumerator(this);
+	while (enumerator->enumerate(enumerator, &entry, &segment))
+	{
+		/* do not accept new threads, drive out waiting threads */
+		entry->driveout_new_threads = TRUE;
+		entry->driveout_waiting_threads = TRUE;
+	}
+	enumerator->destroy(enumerator);
+	DBG2(DBG_MGR, "wait for all threads to leave IKE_SA's");
+	/* Step 2: wait until all are gone */
+	enumerator = create_table_enumerator(this);
+	while (enumerator->enumerate(enumerator, &entry, &segment))
+	{
+		while (entry->waiting_threads || entry->checked_out)
+		{
+			/* wake up all */
+			entry->condvar->broadcast(entry->condvar);
+			/* go sleeping until they are gone */
+			entry->condvar->wait(entry->condvar, this->segments[segment].mutex);
+		}
+	}
+	enumerator->destroy(enumerator);
+	DBG2(DBG_MGR, "delete all IKE_SA's");
+	/* Step 3: initiate deletion of all IKE_SAs */
+	enumerator = create_table_enumerator(this);
+	while (enumerator->enumerate(enumerator, &entry, &segment))
+	{
+		charon->bus->set_sa(charon->bus, entry->ike_sa);
+		/* as the delete never gets processed, fire down events */
+		switch (entry->ike_sa->get_state(entry->ike_sa))
+		{
+			case IKE_ESTABLISHED:
+			case IKE_REKEYING:
+			case IKE_DELETING:
+				charon->bus->ike_updown(charon->bus, entry->ike_sa, FALSE);
+				break;
+			default:
+				break;
+		}
+		entry->ike_sa->delete(entry->ike_sa);
+	}
+	enumerator->destroy(enumerator);
+
+	DBG2(DBG_MGR, "destroy all entries");
+	/* Step 4: destroy all entries */
+	enumerator = create_table_enumerator(this);
+	while (enumerator->enumerate(enumerator, &entry, &segment))
+	{
+		charon->bus->set_sa(charon->bus, entry->ike_sa);
+		if (entry->half_open)
+		{
+			remove_half_open(this, entry);
+		}
+		if (!entry->ike_sa_id->is_initiator(entry->ike_sa_id) &&
+			entry->my_id && entry->other_id)
+		{
+			remove_connected_peers(this, entry);
+		}
+		remove_entry_at((private_enumerator_t*)enumerator);
+		entry_destroy(entry);
+	}
+	enumerator->destroy(enumerator);
+	charon->bus->set_sa(charon->bus, NULL);
+	unlock_all_segments(this);
+}
+
+/**
+ * Implementation of ike_sa_manager_t.destroy.
+ */
+static void destroy(private_ike_sa_manager_t *this)
+{
+	u_int i;
+
+	for (i = 0; i < this->table_size; ++i)
+	{
+		linked_list_t *list;
+
+		if ((list = this->ike_sa_table[i]) != NULL)
+		{
+			list->destroy(list);
+		}
+		if ((list = this->half_open_table[i]) != NULL)
+		{
+			list->destroy(list);
+		}
+		if ((list = this->connected_peers_table[i]) != NULL)
+		{
+			list->destroy(list);
+		}
+	}
+	free(this->ike_sa_table);
+	free(this->half_open_table);
+	free(this->connected_peers_table);
+	for (i = 0; i < this->segment_count; ++i)
+	{
+		this->segments[i].mutex->destroy(this->segments[i].mutex);
+		this->half_open_segments[i].lock->destroy(this->half_open_segments[i].lock);
+		this->connected_peers_segments[i].lock->destroy(this->connected_peers_segments[i].lock);
+	}
+	free(this->segments);
+	free(this->half_open_segments);
+	free(this->connected_peers_segments);
+
+	this->rng->destroy(this->rng);
+	this->hasher->destroy(this->hasher);
+	free(this);
+}
+
+/**
+ * This function returns the next-highest power of two for the given number.
+ * The algorithm works by setting all bits on the right-hand side of the most
+ * significant 1 to 1 and then increments the whole number so it rolls over
+ * to the nearest power of two. Note: returns 0 for n == 0
+ */
+static u_int get_nearest_powerof2(u_int n)
+{
+	u_int i;
+
+	--n;
+	for (i = 1; i < sizeof(u_int) * 8; i <<= 1)
+	{
+		n |= n >> i;
+	}
+	return ++n;
+}
+
+/*
+ * Described in header.
+ */
+ike_sa_manager_t *ike_sa_manager_create()
+{
+	u_int i;
+	private_ike_sa_manager_t *this = malloc_thing(private_ike_sa_manager_t);
+
+	/* assign public functions */
+	this->public.flush = (void(*)(ike_sa_manager_t*))flush;
+	this->public.destroy = (void(*)(ike_sa_manager_t*))destroy;
+	this->public.checkout = (ike_sa_t*(*)(ike_sa_manager_t*, ike_sa_id_t*))checkout;
+	this->public.checkout_new = (ike_sa_t*(*)(ike_sa_manager_t*,bool))checkout_new;
+	this->public.checkout_by_message = (ike_sa_t*(*)(ike_sa_manager_t*,message_t*))checkout_by_message;
+	this->public.checkout_by_config = (ike_sa_t*(*)(ike_sa_manager_t*,peer_cfg_t*))checkout_by_config;
+	this->public.checkout_by_id = (ike_sa_t*(*)(ike_sa_manager_t*,u_int32_t,bool))checkout_by_id;
+	this->public.checkout_by_name = (ike_sa_t*(*)(ike_sa_manager_t*,char*,bool))checkout_by_name;
+	this->public.check_uniqueness = (bool(*)(ike_sa_manager_t*, ike_sa_t *ike_sa))check_uniqueness;
+	this->public.create_enumerator = (enumerator_t*(*)(ike_sa_manager_t*))create_enumerator;
+	this->public.checkin = (void(*)(ike_sa_manager_t*,ike_sa_t*))checkin;
+	this->public.checkin_and_destroy = (void(*)(ike_sa_manager_t*,ike_sa_t*))checkin_and_destroy;
+	this->public.get_half_open_count = (int(*)(ike_sa_manager_t*,host_t*))get_half_open_count;
+
+	/* initialize private variables */
+	this->hasher = lib->crypto->create_hasher(lib->crypto, HASH_PREFERRED);
+	if (this->hasher == NULL)
+	{
+		DBG1(DBG_MGR, "manager initialization failed, no hasher supported");
+		free(this);
+		return NULL;
+	}
+	this->rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
+	if (this->rng == NULL)
+	{
+		DBG1(DBG_MGR, "manager initialization failed, no RNG supported");
+		this->hasher->destroy(this->hasher);
+		free(this);
+		return NULL;
+	}
+	this->table_size = get_nearest_powerof2(lib->settings->get_int(lib->settings,
+						"charon.ikesa_table_size", DEFAULT_HASHTABLE_SIZE));
+	this->table_size = max(1, min(this->table_size, MAX_HASHTABLE_SIZE));
+	this->table_mask = this->table_size - 1;
+
+	this->segment_count = get_nearest_powerof2(lib->settings->get_int(lib->settings,
+						"charon.ikesa_table_segments", DEFAULT_SEGMENT_COUNT));
+	this->segment_count = max(1, min(this->segment_count, this->table_size));
+	this->segment_mask = this->segment_count - 1;
+
+	this->ike_sa_table = calloc(this->table_size, sizeof(linked_list_t*));
+
+	this->segments = (segment_t*)calloc(this->segment_count, sizeof(segment_t));
+	for (i = 0; i < this->segment_count; ++i)
+	{
+		this->segments[i].mutex = mutex_create(MUTEX_TYPE_RECURSIVE);
+		this->segments[i].count = 0;
+	}
+
+	/* we use the same table parameters for the table to track half-open SAs */
+	this->half_open_table = calloc(this->table_size, sizeof(linked_list_t*));
+	this->half_open_segments = calloc(this->segment_count, sizeof(shareable_segment_t));
+	for (i = 0; i < this->segment_count; ++i)
+	{
+		this->half_open_segments[i].lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
+		this->half_open_segments[i].count = 0;
+	}
+
+	/* also for the hash table used for duplicate tests */
+	this->connected_peers_table = calloc(this->table_size, sizeof(linked_list_t*));
+	this->connected_peers_segments = calloc(this->segment_count, sizeof(shareable_segment_t));
+	for (i = 0; i < this->segment_count; ++i)
+	{
+		this->connected_peers_segments[i].lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
+		this->connected_peers_segments[i].count = 0;
+	}
+
+	this->reuse_ikesa = lib->settings->get_bool(lib->settings,
+												"charon.reuse_ikesa", TRUE);
+	return &this->public;
+}
diff --git a/src/libcharon/sa/ike_sa_manager.h b/src/libcharon/sa/ike_sa_manager.h
new file mode 100644
index 000000000..38f5454e1
--- /dev/null
+++ b/src/libcharon/sa/ike_sa_manager.h
@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2005-2008 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_sa_manager ike_sa_manager
+ * @{ @ingroup sa
+ */
+
+#ifndef IKE_SA_MANAGER_H_
+#define IKE_SA_MANAGER_H_
+
+typedef struct ike_sa_manager_t ike_sa_manager_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <encoding/message.h>
+#include <config/peer_cfg.h>
+
+/**
+ * Manages and synchronizes access to all IKE_SAs.
+ *
+ * To synchronize access to thread-unsave IKE_SAs, they are checked out for
+ * use and checked in afterwards. A checked out SA is exclusively accessible
+ * by the owning thread.
+ */
+struct ike_sa_manager_t {
+
+	/**
+	 * Checkout an existing IKE_SA.
+	 *
+	 * @param ike_sa_id			the SA identifier, will be updated
+	 * @returns
+	 * 							- checked out IKE_SA if found
+	 * 							- NULL, if specified IKE_SA is not found.
+	 */
+	ike_sa_t* (*checkout) (ike_sa_manager_t* this, ike_sa_id_t *sa_id);
+
+	/**
+	 * Create and check out a new IKE_SA.
+	 *
+	 * @note If initiator equals FALSE, the returned IKE_SA is not registered
+	 * in the manager.
+	 *
+	 * @param initiator			TRUE for initiator, FALSE otherwise
+	 * @returns 				created and checked out IKE_SA
+	 */
+	ike_sa_t* (*checkout_new) (ike_sa_manager_t* this, bool initiator);
+
+	/**
+	 * Checkout an IKE_SA by a message.
+	 *
+	 * In some situations, it is necessary that the manager knows the
+	 * message to use for the checkout. This has the following reasons:
+	 *
+	 * 1. If the targeted IKE_SA is already processing a message, we do not
+	 *    check it out if the message ID is the same.
+	 * 2. If it is an IKE_SA_INIT request, we have to check if it is a
+	 *    retransmission. If so, we have to drop the message, we would
+	 *    create another unneeded IKE_SA for each retransmitted packet.
+	 *
+	 * A call to checkout_by_message() returns a (maybe new created) IKE_SA.
+	 * If processing the message does not make sense (for the reasons above),
+	 * NULL is returned.
+	 *
+	 * @param ike_sa_id			the SA identifier, will be updated
+	 * @returns
+	 * 							- checked out/created IKE_SA
+	 * 							- NULL to not process message further
+	 */
+	ike_sa_t* (*checkout_by_message) (ike_sa_manager_t* this, message_t *message);
+
+	/**
+	 * Checkout an IKE_SA for initiation by a peer_config.
+	 *
+	 * To initiate, a CHILD_SA may be established within an existing IKE_SA.
+	 * This call checks for an existing IKE_SA by comparing the configuration.
+	 * If the CHILD_SA can be created in an existing IKE_SA, the matching SA
+	 * is returned.
+	 * If no IKE_SA is found, a new one is created. This is also the case when
+	 * the found IKE_SA is in the DELETING state.
+	 *
+	 * @param peer_cfg			configuration used to find an existing IKE_SA
+	 * @return					checked out/created IKE_SA
+	 */
+	ike_sa_t* (*checkout_by_config) (ike_sa_manager_t* this,
+									 peer_cfg_t *peer_cfg);
+
+	/**
+	 * Check for duplicates of the given IKE_SA.
+	 *
+	 * Measures are taken according to the uniqueness policy of the IKE_SA.
+	 * The return value indicates whether duplicates have been found and if
+	 * further measures should be taken (e.g. cancelling an IKE_AUTH exchange).
+	 * check_uniqueness() must be called before the IKE_SA is complete,
+	 * deadlocks occur otherwise.
+	 *
+	 * @param ike_sa			ike_sa to check
+	 * @return					TRUE, if the given IKE_SA has duplicates and
+	 * 							should be deleted
+	 */
+	bool (*check_uniqueness)(ike_sa_manager_t *this, ike_sa_t *ike_sa);
+
+	/**
+	 * Check out an IKE_SA a unique ID.
+	 *
+	 * Every IKE_SA and every CHILD_SA is uniquely identified by an ID.
+	 * These checkout function uses, depending
+	 * on the child parameter, the unique ID of the IKE_SA or the reqid
+	 * of one of a IKE_SAs CHILD_SA.
+	 *
+	 * @param id				unique ID of the object
+	 * @param child				TRUE to use CHILD, FALSE to use IKE_SA
+	 * @return
+	 * 							- checked out IKE_SA, if found
+	 * 							- NULL, if not found
+	 */
+	ike_sa_t* (*checkout_by_id) (ike_sa_manager_t* this, u_int32_t id,
+								 bool child);
+
+	/**
+	 * Check out an IKE_SA by the policy/connection name.
+	 *
+	 * Check out the IKE_SA by the configuration name, either from the IKE- or
+	 * one of its CHILD_SAs.
+	 *
+	 * @param name				name of the connection/policy
+	 * @param child				TRUE to use policy name, FALSE to use conn name
+	 * @return
+	 * 							- checked out IKE_SA, if found
+	 * 							- NULL, if not found
+	 */
+	ike_sa_t* (*checkout_by_name) (ike_sa_manager_t* this, char *name,
+								   bool child);
+
+	/**
+	 * Create an enumerator over all stored IKE_SAs.
+	 *
+	 * While enumerating an IKE_SA, it is temporarily checked out and
+	 * automatically checked in after the current enumeration step.
+	 *
+	 * @return					enumerator over all IKE_SAs.
+	 */
+	enumerator_t *(*create_enumerator) (ike_sa_manager_t* this);
+
+	/**
+	 * Checkin the SA after usage.
+	 *
+	 * If the IKE_SA is not registered in the manager, a new entry is created.
+	 *
+	 * @param ike_sa_id			the SA identifier, will be updated
+	 * @param ike_sa			checked out SA
+	 */
+	void (*checkin) (ike_sa_manager_t* this, ike_sa_t *ike_sa);
+
+	/**
+	 * Destroy a checked out SA.
+	 *
+	 * The IKE SA is destroyed without notification of the remote peer.
+	 * Use this only if the other peer doesn't respond or behaves not
+	 * as predicted.
+	 * Checking in and destruction is an atomic operation (for the IKE_SA),
+	 * so this can be called if the SA is in a "unclean" state, without the
+	 * risk that another thread can get the SA.
+	 *
+	 * @param ike_sa			SA to delete
+	 */
+	void (*checkin_and_destroy) (ike_sa_manager_t* this, ike_sa_t *ike_sa);
+
+	/**
+	 * Get the number of IKE_SAs which are in the connecting state.
+	 *
+	 * To prevent the server from resource exhaustion, cookies and other
+	 * mechanisms are used. The number of half open IKE_SAs is a good
+	 * indicator to see if a peer is flooding the server.
+	 * If a host is supplied, only the number of half open IKE_SAs initiated
+	 * from this IP are counted.
+	 * Only SAs for which we are the responder are counted.
+	 *
+	 * @param ip				NULL for all, IP for half open IKE_SAs with IP
+	 * @return					number of half open IKE_SAs
+	 */
+	int (*get_half_open_count) (ike_sa_manager_t *this, host_t *ip);
+
+	/**
+	 * Delete all existing IKE_SAs and destroy them immediately.
+	 *
+	 * Threads will be driven out, so all SAs can be deleted cleanly.
+	 */
+	void (*flush)(ike_sa_manager_t *this);
+
+	/**
+	 * Destroys the manager with all associated SAs.
+	 *
+	 * A call to flush() is required before calling destroy.
+	 */
+	void (*destroy) (ike_sa_manager_t *this);
+};
+
+/**
+ * Create the IKE_SA manager.
+ *
+ * @returns 	ike_sa_manager_t object, NULL if initialization fails
+ */
+ike_sa_manager_t *ike_sa_manager_create(void);
+
+#endif /** IKE_SA_MANAGER_H_ @}*/
diff --git a/src/libcharon/sa/keymat.c b/src/libcharon/sa/keymat.c
new file mode 100644
index 000000000..837cbe428
--- /dev/null
+++ b/src/libcharon/sa/keymat.c
@@ -0,0 +1,617 @@
+/*
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "keymat.h"
+
+#include <daemon.h>
+#include <crypto/prf_plus.h>
+
+typedef struct private_keymat_t private_keymat_t;
+
+/**
+ * Private data of an keymat_t object.
+ */
+struct private_keymat_t {
+
+	/**
+	 * Public keymat_t interface.
+	 */
+	keymat_t public;
+
+	/**
+	 * IKE_SA Role, initiator or responder
+	 */
+	bool initiator;
+
+	/**
+	 * inbound signer (verify)
+	 */
+	signer_t *signer_in;
+
+	/**
+	 * outbound signer (sign)
+	 */
+	signer_t *signer_out;
+
+	/**
+	 * inbound crypter (decrypt)
+	 */
+	crypter_t *crypter_in;
+
+	/**
+	 * outbound crypter (encrypt)
+	 */
+	crypter_t *crypter_out;
+
+	/**
+	 * General purpose PRF
+	 */
+	prf_t *prf;
+
+	/**
+	 * Negotiated PRF algorithm
+	 */
+	pseudo_random_function_t prf_alg;
+
+	/**
+	 * Key to derive key material from for CHILD_SAs, rekeying
+	 */
+	chunk_t skd;
+
+	/**
+	 * Key to build outging authentication data (SKp)
+	 */
+	chunk_t skp_build;
+
+	/**
+	 * Key to verify incoming authentication data (SKp)
+	 */
+	chunk_t skp_verify;
+};
+
+typedef struct keylen_entry_t keylen_entry_t;
+
+/**
+ * Implicit key length for an algorithm
+ */
+struct keylen_entry_t {
+	/** IKEv2 algorithm identifier */
+	int algo;
+	/** key length in bits */
+	int len;
+};
+
+#define END_OF_LIST -1
+
+/**
+ * Keylen for encryption algos
+ */
+keylen_entry_t keylen_enc[] = {
+	{ENCR_DES,					 64},
+	{ENCR_3DES,					192},
+	{END_OF_LIST,				  0}
+};
+
+/**
+ * Keylen for integrity algos
+ */
+keylen_entry_t keylen_int[] = {
+	{AUTH_HMAC_MD5_96,			128},
+	{AUTH_HMAC_SHA1_96,			160},
+	{AUTH_HMAC_SHA2_256_96,		256},
+	{AUTH_HMAC_SHA2_256_128,	256},
+	{AUTH_HMAC_SHA2_384_192,	384},
+	{AUTH_HMAC_SHA2_512_256,	512},
+	{AUTH_AES_XCBC_96,			128},
+	{END_OF_LIST,				  0}
+};
+
+/**
+ * Lookup key length of an algorithm
+ */
+static int lookup_keylen(keylen_entry_t *list, int algo)
+{
+	while (list->algo != END_OF_LIST)
+	{
+		if (algo == list->algo)
+		{
+			return list->len;
+		}
+		list++;
+	}
+	return 0;
+}
+
+/**
+ * Implementation of keymat_t.create_dh
+ */
+static diffie_hellman_t* create_dh(private_keymat_t *this,
+								   diffie_hellman_group_t group)
+{
+	return lib->crypto->create_dh(lib->crypto, group);;
+}
+
+/**
+ * Implementation of keymat_t.derive_keys
+ */
+static bool derive_ike_keys(private_keymat_t *this, proposal_t *proposal,
+							diffie_hellman_t *dh, chunk_t nonce_i,
+							chunk_t nonce_r, ike_sa_id_t *id,
+							pseudo_random_function_t rekey_function,
+							chunk_t rekey_skd)
+{
+	chunk_t skeyseed, key, secret, full_nonce, fixed_nonce, prf_plus_seed;
+	chunk_t spi_i, spi_r;
+	crypter_t *crypter_i, *crypter_r;
+	signer_t *signer_i, *signer_r;
+	prf_plus_t *prf_plus;
+	u_int16_t alg, key_size;
+	prf_t *rekey_prf = NULL;
+
+	spi_i = chunk_alloca(sizeof(u_int64_t));
+	spi_r = chunk_alloca(sizeof(u_int64_t));
+
+	if (dh->get_shared_secret(dh, &secret) != SUCCESS)
+	{
+		return FALSE;
+	}
+
+	/* Create SAs general purpose PRF first, we may use it here */
+	if (!proposal->get_algorithm(proposal, PSEUDO_RANDOM_FUNCTION, &alg, NULL))
+	{
+		DBG1(DBG_IKE, "no %N selected",
+			 transform_type_names, PSEUDO_RANDOM_FUNCTION);
+		return FALSE;
+	}
+	this->prf_alg = alg;
+	this->prf = lib->crypto->create_prf(lib->crypto, alg);
+	if (this->prf == NULL)
+	{
+		DBG1(DBG_IKE, "%N %N not supported!",
+			 transform_type_names, PSEUDO_RANDOM_FUNCTION,
+			 pseudo_random_function_names, alg);
+		return FALSE;
+	}
+	DBG4(DBG_IKE, "shared Diffie Hellman secret %B", &secret);
+	/* full nonce is used as seed for PRF+ ... */
+	full_nonce = chunk_cat("cc", nonce_i, nonce_r);
+	/* but the PRF may need a fixed key which only uses the first bytes of
+	 * the nonces. */
+	switch (alg)
+	{
+		case PRF_AES128_XCBC:
+			/* while rfc4434 defines variable keys for AES-XCBC, rfc3664 does
+			 * not and therefore fixed key semantics apply to XCBC for key
+			 * derivation. */
+			key_size = this->prf->get_key_size(this->prf)/2;
+			nonce_i.len = min(nonce_i.len, key_size);
+			nonce_r.len = min(nonce_r.len, key_size);
+			break;
+		default:
+			/* all other algorithms use variable key length, full nonce */
+			break;
+	}
+	fixed_nonce = chunk_cat("cc", nonce_i, nonce_r);
+	*((u_int64_t*)spi_i.ptr) = id->get_initiator_spi(id);
+	*((u_int64_t*)spi_r.ptr) = id->get_responder_spi(id);
+	prf_plus_seed = chunk_cat("ccc", full_nonce, spi_i, spi_r);
+
+	/* KEYMAT = prf+ (SKEYSEED, Ni | Nr | SPIi | SPIr)
+	 *
+	 * if we are rekeying, SKEYSEED is built on another way
+	 */
+	if (rekey_function == PRF_UNDEFINED) /* not rekeying */
+	{
+		/* SKEYSEED = prf(Ni | Nr, g^ir) */
+		this->prf->set_key(this->prf, fixed_nonce);
+		this->prf->allocate_bytes(this->prf, secret, &skeyseed);
+		this->prf->set_key(this->prf, skeyseed);
+		prf_plus = prf_plus_create(this->prf, prf_plus_seed);
+	}
+	else
+	{
+		/* SKEYSEED = prf(SK_d (old), [g^ir (new)] | Ni | Nr)
+		 * use OLD SAs PRF functions for both prf_plus and prf */
+		rekey_prf = lib->crypto->create_prf(lib->crypto, rekey_function);
+		if (!rekey_prf)
+		{
+			DBG1(DBG_IKE, "PRF of old SA %N not supported!",
+				 pseudo_random_function_names, rekey_function);
+			chunk_free(&full_nonce);
+			chunk_free(&fixed_nonce);
+			chunk_clear(&prf_plus_seed);
+			return FALSE;
+		}
+		secret = chunk_cat("mc", secret, full_nonce);
+		rekey_prf->set_key(rekey_prf, rekey_skd);
+		rekey_prf->allocate_bytes(rekey_prf, secret, &skeyseed);
+		rekey_prf->set_key(rekey_prf, skeyseed);
+		prf_plus = prf_plus_create(rekey_prf, prf_plus_seed);
+	}
+	DBG4(DBG_IKE, "SKEYSEED %B", &skeyseed);
+
+	chunk_clear(&skeyseed);
+	chunk_clear(&secret);
+	chunk_free(&full_nonce);
+	chunk_free(&fixed_nonce);
+	chunk_clear(&prf_plus_seed);
+
+	/* KEYMAT = SK_d | SK_ai | SK_ar | SK_ei | SK_er | SK_pi | SK_pr */
+
+	/* SK_d is used for generating CHILD_SA key mat => store for later use */
+	key_size = this->prf->get_key_size(this->prf);
+	prf_plus->allocate_bytes(prf_plus, key_size, &this->skd);
+	DBG4(DBG_IKE, "Sk_d secret %B", &this->skd);
+
+	/* SK_ai/SK_ar used for integrity protection => signer_in/signer_out */
+	if (!proposal->get_algorithm(proposal, INTEGRITY_ALGORITHM, &alg, NULL))
+	{
+		DBG1(DBG_IKE, "no %N selected",
+			 transform_type_names, INTEGRITY_ALGORITHM);
+		prf_plus->destroy(prf_plus);
+		DESTROY_IF(rekey_prf);
+		return FALSE;
+	}
+	signer_i = lib->crypto->create_signer(lib->crypto, alg);
+	signer_r = lib->crypto->create_signer(lib->crypto, alg);
+	if (signer_i == NULL || signer_r == NULL)
+	{
+		DBG1(DBG_IKE, "%N %N not supported!",
+			 transform_type_names, INTEGRITY_ALGORITHM,
+			 integrity_algorithm_names ,alg);
+		prf_plus->destroy(prf_plus);
+		DESTROY_IF(rekey_prf);
+		return FALSE;
+	}
+	key_size = signer_i->get_key_size(signer_i);
+
+	prf_plus->allocate_bytes(prf_plus, key_size, &key);
+	DBG4(DBG_IKE, "Sk_ai secret %B", &key);
+	signer_i->set_key(signer_i, key);
+	chunk_clear(&key);
+
+	prf_plus->allocate_bytes(prf_plus, key_size, &key);
+	DBG4(DBG_IKE, "Sk_ar secret %B", &key);
+	signer_r->set_key(signer_r, key);
+	chunk_clear(&key);
+
+	if (this->initiator)
+	{
+		this->signer_in = signer_r;
+		this->signer_out = signer_i;
+	}
+	else
+	{
+		this->signer_in = signer_i;
+		this->signer_out = signer_r;
+	}
+
+	/* SK_ei/SK_er used for encryption => crypter_in/crypter_out */
+	if (!proposal->get_algorithm(proposal, ENCRYPTION_ALGORITHM, &alg, &key_size))
+	{
+		DBG1(DBG_IKE, "no %N selected",
+			 transform_type_names, ENCRYPTION_ALGORITHM);
+		prf_plus->destroy(prf_plus);
+		DESTROY_IF(rekey_prf);
+		return FALSE;
+	}
+	crypter_i = lib->crypto->create_crypter(lib->crypto, alg, key_size / 8);
+	crypter_r = lib->crypto->create_crypter(lib->crypto, alg, key_size / 8);
+	if (crypter_i == NULL || crypter_r == NULL)
+	{
+		DBG1(DBG_IKE, "%N %N (key size %d) not supported!",
+			 transform_type_names, ENCRYPTION_ALGORITHM,
+			 encryption_algorithm_names, alg, key_size);
+		prf_plus->destroy(prf_plus);
+		DESTROY_IF(rekey_prf);
+		return FALSE;
+	}
+	key_size = crypter_i->get_key_size(crypter_i);
+
+	prf_plus->allocate_bytes(prf_plus, key_size, &key);
+	DBG4(DBG_IKE, "Sk_ei secret %B", &key);
+	crypter_i->set_key(crypter_i, key);
+	chunk_clear(&key);
+
+	prf_plus->allocate_bytes(prf_plus, key_size, &key);
+	DBG4(DBG_IKE, "Sk_er secret %B", &key);
+	crypter_r->set_key(crypter_r, key);
+	chunk_clear(&key);
+
+	if (this->initiator)
+	{
+		this->crypter_in = crypter_r;
+		this->crypter_out = crypter_i;
+	}
+	else
+	{
+		this->crypter_in = crypter_i;
+		this->crypter_out = crypter_r;
+	}
+
+	/* SK_pi/SK_pr used for authentication => stored for later */
+	key_size = this->prf->get_key_size(this->prf);
+	prf_plus->allocate_bytes(prf_plus, key_size, &key);
+	DBG4(DBG_IKE, "Sk_pi secret %B", &key);
+	if (this->initiator)
+	{
+		this->skp_build = key;
+	}
+	else
+	{
+		this->skp_verify = key;
+	}
+	prf_plus->allocate_bytes(prf_plus, key_size, &key);
+	DBG4(DBG_IKE, "Sk_pr secret %B", &key);
+	if (this->initiator)
+	{
+		this->skp_verify = key;
+	}
+	else
+	{
+		this->skp_build = key;
+	}
+
+	/* all done, prf_plus not needed anymore */
+	prf_plus->destroy(prf_plus);
+	DESTROY_IF(rekey_prf);
+
+	return TRUE;
+}
+
+/**
+ * Implementation of keymat_t.derive_child_keys
+ */
+static bool derive_child_keys(private_keymat_t *this,
+							  proposal_t *proposal, diffie_hellman_t *dh,
+							  chunk_t nonce_i, chunk_t nonce_r,
+							  chunk_t *encr_i, chunk_t *integ_i,
+							  chunk_t *encr_r, chunk_t *integ_r)
+{
+	u_int16_t enc_alg, int_alg, enc_size = 0, int_size = 0;
+	chunk_t seed, secret = chunk_empty;
+	prf_plus_t *prf_plus;
+
+	if (dh)
+	{
+		if (dh->get_shared_secret(dh, &secret) != SUCCESS)
+		{
+			return FALSE;
+		}
+		DBG4(DBG_CHD, "DH secret %B", &secret);
+	}
+	seed = chunk_cata("mcc", secret, nonce_i, nonce_r);
+	DBG4(DBG_CHD, "seed %B", &seed);
+
+	if (proposal->get_algorithm(proposal, ENCRYPTION_ALGORITHM,
+								&enc_alg, &enc_size))
+	{
+		DBG2(DBG_CHD, "  using %N for encryption",
+			 encryption_algorithm_names, enc_alg);
+
+		if (!enc_size)
+		{
+			enc_size = lookup_keylen(keylen_enc, enc_alg);
+		}
+		if (enc_alg != ENCR_NULL && !enc_size)
+		{
+			DBG1(DBG_CHD, "no keylength defined for %N",
+				 encryption_algorithm_names, enc_alg);
+			return FALSE;
+		}
+		/* to bytes */
+		enc_size /= 8;
+
+		/* CCM/GCM/CTR/GMAC needs additional bytes */
+		switch (enc_alg)
+		{
+			case ENCR_AES_CCM_ICV8:
+			case ENCR_AES_CCM_ICV12:
+			case ENCR_AES_CCM_ICV16:
+			case ENCR_CAMELLIA_CCM_ICV8:
+			case ENCR_CAMELLIA_CCM_ICV12:
+			case ENCR_CAMELLIA_CCM_ICV16:
+				enc_size += 3;
+				break;
+			case ENCR_AES_GCM_ICV8:
+			case ENCR_AES_GCM_ICV12:
+			case ENCR_AES_GCM_ICV16:
+			case ENCR_AES_CTR:
+			case ENCR_NULL_AUTH_AES_GMAC:
+				enc_size += 4;
+				break;
+			default:
+				break;
+		}
+	}
+
+	if (proposal->get_algorithm(proposal, INTEGRITY_ALGORITHM,
+								&int_alg, &int_size))
+	{
+		DBG2(DBG_CHD, "  using %N for integrity",
+			 integrity_algorithm_names, int_alg);
+
+		if (!int_size)
+		{
+			int_size = lookup_keylen(keylen_int, int_alg);
+		}
+		if (!int_size)
+		{
+			DBG1(DBG_CHD, "no keylength defined for %N",
+				 integrity_algorithm_names, int_alg);
+			return FALSE;
+		}
+		/* to bytes */
+		int_size /= 8;
+	}
+
+	this->prf->set_key(this->prf, this->skd);
+	prf_plus = prf_plus_create(this->prf, seed);
+
+	prf_plus->allocate_bytes(prf_plus, enc_size, encr_i);
+	prf_plus->allocate_bytes(prf_plus, int_size, integ_i);
+	prf_plus->allocate_bytes(prf_plus, enc_size, encr_r);
+	prf_plus->allocate_bytes(prf_plus, int_size, integ_r);
+
+	prf_plus->destroy(prf_plus);
+
+	if (enc_size)
+	{
+		DBG4(DBG_CHD, "encryption initiator key %B", encr_i);
+		DBG4(DBG_CHD, "encryption responder key %B", encr_r);
+	}
+	if (int_size)
+	{
+		DBG4(DBG_CHD, "integrity initiator key %B", integ_i);
+		DBG4(DBG_CHD, "integrity responder key %B", integ_r);
+	}
+	return TRUE;
+}
+
+/**
+ * Implementation of keymat_t.get_skd
+ */
+static pseudo_random_function_t get_skd(private_keymat_t *this, chunk_t *skd)
+{
+	*skd = this->skd;
+	return this->prf_alg;
+}
+
+/**
+ * Implementation of keymat_t.get_signer
+ */
+static signer_t* get_signer(private_keymat_t *this, bool in)
+{
+	return in ? this->signer_in : this->signer_out;
+}
+
+/**
+ * Implementation of keymat_t.get_crypter
+ */
+static crypter_t* get_crypter(private_keymat_t *this, bool in)
+{
+	return in ? this->crypter_in : this->crypter_out;
+}
+
+/**
+ * Implementation of keymat_t.get_auth_octets
+ */
+static chunk_t get_auth_octets(private_keymat_t *this, bool verify,
+							   chunk_t ike_sa_init, chunk_t nonce,
+							   identification_t *id)
+{
+	chunk_t chunk, idx, octets;
+	chunk_t skp;
+
+	skp = verify ? this->skp_verify : this->skp_build;
+
+	chunk = chunk_alloca(4);
+	memset(chunk.ptr, 0, chunk.len);
+	chunk.ptr[0] = id->get_type(id);
+	idx = chunk_cata("cc", chunk, id->get_encoding(id));
+
+	DBG3(DBG_IKE, "IDx' %B", &idx);
+	DBG3(DBG_IKE, "SK_p %B", &skp);
+	this->prf->set_key(this->prf, skp);
+	this->prf->allocate_bytes(this->prf, idx, &chunk);
+
+	octets = chunk_cat("ccm", ike_sa_init, nonce, chunk);
+	DBG3(DBG_IKE, "octets = message + nonce + prf(Sk_px, IDx') %B", &octets);
+	return octets;
+}
+
+/**
+ * Key pad for the AUTH method SHARED_KEY_MESSAGE_INTEGRITY_CODE.
+ */
+#define IKEV2_KEY_PAD "Key Pad for IKEv2"
+#define IKEV2_KEY_PAD_LENGTH 17
+
+/**
+ * Implementation of keymat_t.get_psk_sig
+ */
+static chunk_t get_psk_sig(private_keymat_t *this, bool verify,
+						   chunk_t ike_sa_init, chunk_t nonce, chunk_t secret,
+						   identification_t *id)
+{
+	chunk_t key_pad, key, sig, octets;
+
+	if (!secret.len)
+	{	/* EAP uses SK_p if no MSK has been established */
+		secret = verify ? this->skp_verify : this->skp_build;
+	}
+	octets = get_auth_octets(this, verify, ike_sa_init, nonce, id);
+	/* AUTH = prf(prf(Shared Secret,"Key Pad for IKEv2"), <msg octets>) */
+	key_pad = chunk_create(IKEV2_KEY_PAD, IKEV2_KEY_PAD_LENGTH);
+	this->prf->set_key(this->prf, secret);
+	this->prf->allocate_bytes(this->prf, key_pad, &key);
+	this->prf->set_key(this->prf, key);
+	this->prf->allocate_bytes(this->prf, octets, &sig);
+	DBG4(DBG_IKE, "secret %B", &secret);
+	DBG4(DBG_IKE, "prf(secret, keypad) %B", &key);
+	DBG3(DBG_IKE, "AUTH = prf(prf(secret, keypad), octets) %B", &sig);
+	chunk_free(&octets);
+	chunk_free(&key);
+
+	return sig;
+}
+
+/**
+ * Implementation of keymat_t.destroy.
+ */
+static void destroy(private_keymat_t *this)
+{
+	DESTROY_IF(this->signer_in);
+	DESTROY_IF(this->signer_out);
+	DESTROY_IF(this->crypter_in);
+	DESTROY_IF(this->crypter_out);
+	DESTROY_IF(this->prf);
+	chunk_clear(&this->skd);
+	chunk_clear(&this->skp_verify);
+	chunk_clear(&this->skp_build);
+	free(this);
+}
+
+/**
+ * See header
+ */
+keymat_t *keymat_create(bool initiator)
+{
+	private_keymat_t *this = malloc_thing(private_keymat_t);
+
+	this->public.create_dh = (diffie_hellman_t*(*)(keymat_t*, diffie_hellman_group_t group))create_dh;
+	this->public.derive_ike_keys = (bool(*)(keymat_t*, proposal_t *proposal, diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r, ike_sa_id_t *id, pseudo_random_function_t,chunk_t))derive_ike_keys;
+	this->public.derive_child_keys = (bool(*)(keymat_t*, proposal_t *proposal, diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r, chunk_t *encr_i, chunk_t *integ_i, chunk_t *encr_r, chunk_t *integ_r))derive_child_keys;
+	this->public.get_skd = (pseudo_random_function_t(*)(keymat_t*, chunk_t *skd))get_skd;
+	this->public.get_signer = (signer_t*(*)(keymat_t*, bool in))get_signer;
+	this->public.get_crypter = (crypter_t*(*)(keymat_t*, bool in))get_crypter;
+	this->public.get_auth_octets = (chunk_t(*)(keymat_t *, bool verify, chunk_t ike_sa_init, chunk_t nonce, identification_t *id))get_auth_octets;
+	this->public.get_psk_sig = (chunk_t(*)(keymat_t*, bool verify, chunk_t ike_sa_init, chunk_t nonce, chunk_t secret, identification_t *id))get_psk_sig;
+	this->public.destroy = (void(*)(keymat_t*))destroy;
+
+	this->initiator = initiator;
+
+	this->signer_in = NULL;
+	this->signer_out = NULL;
+	this->crypter_in = NULL;
+	this->crypter_out = NULL;
+	this->prf = NULL;
+	this->prf_alg = PRF_UNDEFINED;
+	this->skd = chunk_empty;
+	this->skp_verify = chunk_empty;
+	this->skp_build = chunk_empty;
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/keymat.h b/src/libcharon/sa/keymat.h
new file mode 100644
index 000000000..e51709e8d
--- /dev/null
+++ b/src/libcharon/sa/keymat.h
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup keymat keymat
+ * @{ @ingroup sa
+ */
+
+#ifndef KEYMAT_H_
+#define KEYMAT_H_
+
+#include <library.h>
+#include <utils/identification.h>
+#include <crypto/prfs/prf.h>
+#include <crypto/crypters/crypter.h>
+#include <crypto/signers/signer.h>
+#include <config/proposal.h>
+#include <sa/ike_sa_id.h>
+
+typedef struct keymat_t keymat_t;
+
+/**
+ * Derivation an management of sensitive keying material.
+ */
+struct keymat_t {
+
+	/**
+	 * Create a diffie hellman object for key agreement.
+	 *
+	 * The diffie hellman is either for IKE negotiation/rekeying or
+	 * CHILD_SA rekeying (using PFS). The resulting DH object must be passed
+	 * to derive_keys or to derive_child_keys and destroyed after use
+	 *
+	 * @param group			diffie hellman group
+	 * @return				DH object, NULL if group not supported
+	 */
+	diffie_hellman_t* (*create_dh)(keymat_t *this, diffie_hellman_group_t group);
+
+	/**
+	 * Derive keys for the IKE_SA.
+	 *
+	 * These keys are not handed out, but are used by the associated signers,
+	 * crypters and authentication functions.
+	 *
+	 * @param proposal	selected algorithms
+	 * @param dh		diffie hellman key allocated by create_dh()
+	 * @param nonce_i	initiators nonce value
+	 * @param nonce_r	responders nonce value
+	 * @param id		IKE_SA identifier
+	 * @param rekey_prf	PRF of old SA if rekeying, PRF_UNDEFINED otherwise
+	 * @param rekey_sdk	SKd of old SA if rekeying
+	 * @return			TRUE on success
+	 */
+	bool (*derive_ike_keys)(keymat_t *this, proposal_t *proposal,
+							diffie_hellman_t *dh, chunk_t nonce_i,
+							chunk_t nonce_r, ike_sa_id_t *id,
+							pseudo_random_function_t rekey_function,
+							chunk_t rekey_skd);
+	/**
+	 * Derive keys for a CHILD_SA.
+	 *
+	 * The keys for the CHILD_SA are allocated in the integ and encr chunks.
+	 * An implementation might hand out encrypted keys only, which are
+	 * decrypted in the kernel before use.
+	 * If no PFS is used for the CHILD_SA, dh can be NULL.
+	 *
+	 * @param proposal	selected algorithms
+	 * @param dh		diffie hellman key allocated by create_dh(), or NULL
+	 * @param nonce_i	initiators nonce value
+	 * @param nonce_r	responders nonce value
+	 * @param encr_i	chunk to write initiators encryption key to
+	 * @param integ_i	chunk to write initiators integrity key to
+	 * @param encr_r	chunk to write responders encryption key to
+	 * @param integ_r	chunk to write responders integrity key to
+	 * @return			TRUE on success
+	 */
+	bool (*derive_child_keys)(keymat_t *this,
+							  proposal_t *proposal, diffie_hellman_t *dh,
+							  chunk_t nonce_i, chunk_t nonce_r,
+							  chunk_t *encr_i, chunk_t *integ_i,
+							  chunk_t *encr_r, chunk_t *integ_r);
+	/**
+	 * Get SKd to pass to derive_ikey_keys() during rekeying.
+	 *
+	 * @param skd		chunk to write SKd to (internal data)
+	 * @return			PRF function to derive keymat
+	 */
+	pseudo_random_function_t (*get_skd)(keymat_t *this, chunk_t *skd);
+
+	/**
+	 * Get a signer to sign/verify IKE messages.
+	 *
+	 * @param in		TRUE for inbound (verify), FALSE for outbound (sign)
+	 * @return			signer
+	 */
+	signer_t* (*get_signer)(keymat_t *this, bool in);
+
+	/*
+	 * Get a crypter to en-/decrypt IKE messages.
+	 *
+	 * @param in		TRUE for inbound (decrypt), FALSE for outbound (encrypt)
+	 * @return			crypter
+	 */
+	crypter_t* (*get_crypter)(keymat_t *this, bool in);
+
+	/**
+	 * Generate octets to use for authentication procedure (RFC4306 2.15).
+	 *
+	 * This method creates the plain octets and is usually signed by a private
+	 * key. PSK and EAP authentication include a secret into the data, use
+	 * the get_psk_sig() method instead.
+	 *
+	 * @param verify		TRUE to create for verfification, FALSE to sign
+	 * @param ike_sa_init	encoded ike_sa_init message
+	 * @param nonce			nonce value
+	 * @param id			identity
+	 * @return				authentication octets
+	 */
+	chunk_t (*get_auth_octets)(keymat_t *this, bool verify, chunk_t ike_sa_init,
+							   chunk_t nonce, identification_t *id);
+	/**
+	 * Build the shared secret signature used for PSK and EAP authentication.
+	 *
+	 * This method wraps the get_auth_octets() method and additionally
+	 * includes the secret into the signature. If no secret is given, SK_p is
+	 * used as secret (used for EAP methods without MSK).
+	 *
+	 * @param verify		TRUE to create for verfification, FALSE to sign
+	 * @param ike_sa_init	encoded ike_sa_init message
+	 * @param nonce			nonce value
+	 * @param secret		optional secret to include into signature
+	 * @param id			identity
+	 * @return				signature octets
+	 */
+	chunk_t (*get_psk_sig)(keymat_t *this, bool verify, chunk_t ike_sa_init,
+						   chunk_t nonce, chunk_t secret, identification_t *id);
+	/**
+	 * Destroy a keymat_t.
+	 */
+	void (*destroy)(keymat_t *this);
+};
+
+/**
+ * Create a keymat instance.
+ *
+ * @param initiator		TRUE if we are the initiator
+ * @return				keymat instance
+ */
+keymat_t *keymat_create(bool initiator);
+
+#endif /** KEYMAT_H_ @}*/
diff --git a/src/libcharon/sa/mediation_manager.c b/src/libcharon/sa/mediation_manager.c
new file mode 100644
index 000000000..035f49053
--- /dev/null
+++ b/src/libcharon/sa/mediation_manager.c
@@ -0,0 +1,341 @@
+/*
+ * Copyright (C) 2007 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "mediation_manager.h"
+
+#include <daemon.h>
+#include <threading/mutex.h>
+#include <utils/linked_list.h>
+#include <processing/jobs/mediation_job.h>
+
+typedef struct peer_t peer_t;
+
+/**
+ * An entry in the linked list.
+ */
+struct peer_t {
+	/** id of the peer */
+	identification_t *id;
+
+	/** sa id of the peer, NULL if offline */
+	ike_sa_id_t *ike_sa_id;
+
+	/** list of peer ids that reuested this peer */
+	linked_list_t *requested_by;
+};
+
+/**
+ * Implementation of peer_t.destroy.
+ */
+static void peer_destroy(peer_t *this)
+{
+	DESTROY_IF(this->id);
+	DESTROY_IF(this->ike_sa_id);
+	this->requested_by->destroy_offset(this->requested_by,
+									   offsetof(identification_t, destroy));
+	free(this);
+}
+
+/**
+ * Creates a new entry for the list.
+ */
+static peer_t *peer_create(identification_t *id, ike_sa_id_t* ike_sa_id)
+{
+	peer_t *this = malloc_thing(peer_t);
+
+	/* clone everything */
+	this->id = id->clone(id);
+	this->ike_sa_id = ike_sa_id ? ike_sa_id->clone(ike_sa_id) : NULL;
+	this->requested_by = linked_list_create();
+
+	return this;
+}
+
+typedef struct private_mediation_manager_t private_mediation_manager_t;
+
+/**
+ * Additional private members of mediation_manager_t.
+ */
+struct private_mediation_manager_t {
+	/**
+	 * Public interface of mediation_manager_t.
+	 */
+	 mediation_manager_t public;
+
+	 /**
+	  * Lock for exclusivly accessing the manager.
+	  */
+	 mutex_t *mutex;
+
+	 /**
+	  * Linked list with state entries.
+	  */
+	 linked_list_t *peers;
+};
+
+/**
+ * Registers a peer's ID at another peer, if it is not yet registered
+ */
+static void register_peer(peer_t *peer, identification_t *peer_id)
+{
+	iterator_t *iterator;
+	identification_t *current;
+
+	iterator = peer->requested_by->create_iterator(peer->requested_by, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (peer_id->equals(peer_id, current))
+		{
+			iterator->destroy(iterator);
+			return;
+		}
+	}
+	iterator->destroy(iterator);
+
+	peer->requested_by->insert_last(peer->requested_by,
+									peer_id->clone(peer_id));
+}
+
+/**
+ * Get a peer_t object by a peer's id
+ */
+static status_t get_peer_by_id(private_mediation_manager_t *this,
+							   identification_t *id, peer_t **peer)
+{
+	iterator_t *iterator;
+	peer_t *current;
+	status_t status = NOT_FOUND;
+
+	iterator = this->peers->create_iterator(this->peers, TRUE);
+	while (iterator->iterate(iterator, (void**)&current))
+	{
+		if (id->equals(id, current->id))
+		{
+			if (peer)
+			{
+				*peer = current;
+			}
+			status = SUCCESS;
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	return status;
+}
+
+/**
+ * Check if a given peer is registered at other peers. If so, remove it there
+ * and then remove peers completely that are not online and have no registered
+ * peers.
+ */
+static void unregister_peer(private_mediation_manager_t *this,
+							identification_t *peer_id)
+{
+	iterator_t *iterator, *iterator_r;
+	peer_t *peer;
+	identification_t *registered;
+
+	iterator = this->peers->create_iterator(this->peers, TRUE);
+	while (iterator->iterate(iterator, (void**)&peer))
+	{
+		iterator_r = peer->requested_by->create_iterator(peer->requested_by,
+														 TRUE);
+		while (iterator_r->iterate(iterator_r, (void**)&registered))
+		{
+			if (peer_id->equals(peer_id, registered))
+			{
+				iterator_r->remove(iterator_r);
+				registered->destroy(registered);
+				break;
+			}
+		}
+		iterator_r->destroy(iterator_r);
+
+		if (!peer->ike_sa_id && !peer->requested_by->get_count(peer->requested_by))
+		{
+			iterator->remove(iterator);
+			peer_destroy(peer);
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Implementation of mediation_manager_t.remove
+ */
+static void remove_sa(private_mediation_manager_t *this, ike_sa_id_t *ike_sa_id)
+{
+	iterator_t *iterator;
+	peer_t *peer;
+
+	this->mutex->lock(this->mutex);
+
+	iterator = this->peers->create_iterator(this->peers, TRUE);
+	while (iterator->iterate(iterator, (void**)&peer))
+	{
+		if (ike_sa_id->equals(ike_sa_id, peer->ike_sa_id))
+		{
+			iterator->remove(iterator);
+
+			unregister_peer(this, peer->id);
+
+			peer_destroy(peer);
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of mediation_manager_t.update_sa_id
+ */
+static void update_sa_id(private_mediation_manager_t *this, identification_t *peer_id, ike_sa_id_t *ike_sa_id)
+{
+	iterator_t *iterator;
+	peer_t *peer;
+	bool found = FALSE;
+
+	this->mutex->lock(this->mutex);
+
+	iterator = this->peers->create_iterator(this->peers, TRUE);
+	while (iterator->iterate(iterator, (void**)&peer))
+	{
+		if (peer_id->equals(peer_id, peer->id))
+		{
+			DESTROY_IF(peer->ike_sa_id);
+			found = TRUE;
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	if (!found)
+	{
+		DBG2(DBG_IKE, "adding peer '%Y'", peer_id);
+		peer = peer_create(peer_id, NULL);
+		this->peers->insert_last(this->peers, peer);
+	}
+
+	DBG2(DBG_IKE, "changing registered IKE_SA ID of peer '%Y'", peer_id);
+	peer->ike_sa_id = ike_sa_id ? ike_sa_id->clone(ike_sa_id) : NULL;
+
+	/* send callbacks to registered peers */
+	identification_t *requester;
+	while(peer->requested_by->remove_last(peer->requested_by,
+										  (void**)&requester) == SUCCESS)
+	{
+		job_t *job = (job_t*)mediation_callback_job_create(requester, peer_id);
+		charon->processor->queue_job(charon->processor, job);
+		requester->destroy(requester);
+	}
+
+	this->mutex->unlock(this->mutex);
+}
+
+/**
+ * Implementation of mediation_manager_t.check.
+ */
+static ike_sa_id_t *check(private_mediation_manager_t *this,
+			identification_t *peer_id)
+{
+	peer_t *peer;
+	ike_sa_id_t *ike_sa_id;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_peer_by_id(this, peer_id, &peer) != SUCCESS)
+	{
+		this->mutex->unlock(this->mutex);
+		return NULL;
+	}
+
+	ike_sa_id = peer->ike_sa_id;
+
+	this->mutex->unlock(this->mutex);
+
+	return ike_sa_id;
+}
+
+/**
+ * Implementation of mediation_manager_t.check_and_register.
+ */
+static ike_sa_id_t *check_and_register(private_mediation_manager_t *this,
+			identification_t *peer_id, identification_t *requester)
+{
+	peer_t *peer;
+	ike_sa_id_t *ike_sa_id;
+
+	this->mutex->lock(this->mutex);
+
+	if (get_peer_by_id(this, peer_id, &peer) != SUCCESS)
+	{
+		DBG2(DBG_IKE, "adding peer %Y", peer_id);
+		peer = peer_create(peer_id, NULL);
+		this->peers->insert_last(this->peers, peer);
+	}
+
+	if (!peer->ike_sa_id)
+	{
+		/* the peer is not online */
+		DBG2(DBG_IKE, "requested peer '%Y' is offline, registering peer '%Y'",
+			 peer_id, requester);
+		register_peer(peer, requester);
+		this->mutex->unlock(this->mutex);
+		return NULL;
+	}
+
+	ike_sa_id = peer->ike_sa_id;
+
+	this->mutex->unlock(this->mutex);
+
+	return ike_sa_id;
+}
+
+/**
+ * Implementation of mediation_manager_t.destroy.
+ */
+static void destroy(private_mediation_manager_t *this)
+{
+	this->mutex->lock(this->mutex);
+
+	this->peers->destroy_function(this->peers, (void*)peer_destroy);
+
+	this->mutex->unlock(this->mutex);
+	this->mutex->destroy(this->mutex);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+mediation_manager_t *mediation_manager_create()
+{
+	private_mediation_manager_t *this = malloc_thing(private_mediation_manager_t);
+
+	this->public.destroy = (void(*)(mediation_manager_t*))destroy;
+	this->public.remove = (void(*)(mediation_manager_t*,ike_sa_id_t*))remove_sa;
+	this->public.update_sa_id = (void(*)(mediation_manager_t*,identification_t*,ike_sa_id_t*))update_sa_id;
+	this->public.check = (ike_sa_id_t*(*)(mediation_manager_t*,identification_t*))check;
+	this->public.check_and_register = (ike_sa_id_t*(*)(mediation_manager_t*,identification_t*,identification_t*))check_and_register;
+
+	this->peers = linked_list_create();
+	this->mutex = mutex_create(MUTEX_TYPE_DEFAULT);
+
+	return (mediation_manager_t*)this;
+}
diff --git a/src/libcharon/sa/mediation_manager.h b/src/libcharon/sa/mediation_manager.h
new file mode 100644
index 000000000..31a16f69c
--- /dev/null
+++ b/src/libcharon/sa/mediation_manager.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2007 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup mediation_manager mediation_manager
+ * @{ @ingroup sa
+ */
+
+#ifndef MEDIATION_MANAGER_H_
+#define MEDIATION_MANAGER_H_
+
+typedef struct mediation_manager_t mediation_manager_t;
+
+#include <sa/ike_sa_id.h>
+#include <utils/identification.h>
+
+/**
+ * The mediation manager is responsible for managing currently online
+ * peers and registered requests for offline peers on the mediation server.
+ */
+struct mediation_manager_t {
+
+	/**
+	 * Remove the IKE_SA of a peer.
+	 *
+	 * @param ike_sa_id			the IKE_SA ID of the peer's SA
+	 */
+	void (*remove) (mediation_manager_t* this, ike_sa_id_t *ike_sa_id);
+
+	/**
+	 * Update the ike_sa_id that is assigned to a peer's ID. If the peer
+	 * is new, it gets a new record assigned.
+	 *
+	 * @param peer_id			the peer's ID
+	 * @param ike_sa_id			the IKE_SA ID of the peer's SA
+	 */
+	void (*update_sa_id) (mediation_manager_t* this, identification_t *peer_id,
+						  ike_sa_id_t *ike_sa_id);
+
+	/**
+	 * Checks if a specific peer is online.
+	 *
+	 * @param peer_id			the peer's ID
+	 * @returns
+	 *							- IKE_SA ID of the peer's SA.
+	 *							- NULL, if the peer is not online.
+	 */
+	ike_sa_id_t* (*check) (mediation_manager_t* this,
+						   identification_t *peer_id);
+
+	/**
+	 * Checks if a specific peer is online and registers the requesting
+	 * peer if it is not.
+	 *
+	 * @param peer_id			the peer's ID
+	 * @param requester			the requesters ID
+	 * @returns
+	 *							- IKE_SA ID of the peer's SA.
+	 *							- NULL, if the peer is not online.
+	 */
+	ike_sa_id_t* (*check_and_register) (mediation_manager_t* this,
+										identification_t *peer_id,
+										identification_t *requester);
+
+	/**
+	 * Destroys the manager with all data.
+	 */
+	void (*destroy) (mediation_manager_t *this);
+};
+
+/**
+ * Create a manager.
+ *
+ * @returns	mediation_manager_t object
+ */
+mediation_manager_t *mediation_manager_create(void);
+
+#endif /** MEDIATION_MANAGER_H_ @}*/
diff --git a/src/libcharon/sa/task_manager.c b/src/libcharon/sa/task_manager.c
new file mode 100644
index 000000000..eeda6c860
--- /dev/null
+++ b/src/libcharon/sa/task_manager.c
@@ -0,0 +1,1083 @@
+/*
+ * Copyright (C) 2007 Tobias Brunner
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "task_manager.h"
+
+#include <math.h>
+
+#include <daemon.h>
+#include <sa/tasks/ike_init.h>
+#include <sa/tasks/ike_natd.h>
+#include <sa/tasks/ike_mobike.h>
+#include <sa/tasks/ike_auth.h>
+#include <sa/tasks/ike_auth_lifetime.h>
+#include <sa/tasks/ike_cert_pre.h>
+#include <sa/tasks/ike_cert_post.h>
+#include <sa/tasks/ike_rekey.h>
+#include <sa/tasks/ike_delete.h>
+#include <sa/tasks/ike_config.h>
+#include <sa/tasks/ike_dpd.h>
+#include <sa/tasks/ike_vendor.h>
+#include <sa/tasks/child_create.h>
+#include <sa/tasks/child_rekey.h>
+#include <sa/tasks/child_delete.h>
+#include <encoding/payloads/delete_payload.h>
+#include <processing/jobs/retransmit_job.h>
+
+#ifdef ME
+#include <sa/tasks/ike_me.h>
+#endif
+
+typedef struct exchange_t exchange_t;
+
+/**
+ * An exchange in the air, used do detect and handle retransmission
+ */
+struct exchange_t {
+
+	/**
+	 * Message ID used for this transaction
+	 */
+	u_int32_t mid;
+
+	/**
+	 * generated packet for retransmission
+	 */
+	packet_t *packet;
+};
+
+typedef struct private_task_manager_t private_task_manager_t;
+
+/**
+ * private data of the task manager
+ */
+struct private_task_manager_t {
+
+	/**
+	 * public functions
+	 */
+	task_manager_t public;
+
+	/**
+	 * associated IKE_SA we are serving
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Exchange we are currently handling as responder
+	 */
+	struct {
+		/**
+		 * Message ID of the exchange
+		 */
+		u_int32_t mid;
+
+		/**
+		 * packet for retransmission
+		 */
+		packet_t *packet;
+
+	} responding;
+
+	/**
+	 * Exchange we are currently handling as initiator
+	 */
+	struct {
+		/**
+		 * Message ID of the exchange
+		 */
+		u_int32_t mid;
+
+		/**
+		 * how many times we have retransmitted so far
+		 */
+		u_int retransmitted;
+
+		/**
+		 * packet for retransmission
+		 */
+		packet_t *packet;
+
+		/**
+		 * type of the initated exchange
+		 */
+		exchange_type_t type;
+
+	} initiating;
+
+	/**
+	 * List of queued tasks not yet in action
+	 */
+	linked_list_t *queued_tasks;
+
+	/**
+	 * List of active tasks, initiated by ourselve
+	 */
+	linked_list_t *active_tasks;
+
+	/**
+	 * List of tasks initiated by peer
+	 */
+	linked_list_t *passive_tasks;
+
+	/**
+	 * the task manager has been reset
+	 */
+	bool reset;
+
+	/**
+	 * Number of times we retransmit messages before giving up
+	 */
+	u_int retransmit_tries;
+
+	/**
+	 * Retransmission timeout
+	 */
+	double retransmit_timeout;
+
+	/**
+	 * Base to calculate retransmission timeout
+	 */
+	double retransmit_base;
+};
+
+/**
+ * flush all tasks in the task manager
+ */
+static void flush(private_task_manager_t *this)
+{
+	this->queued_tasks->destroy_offset(this->queued_tasks,
+										offsetof(task_t, destroy));
+	this->passive_tasks->destroy_offset(this->passive_tasks,
+										offsetof(task_t, destroy));
+	this->active_tasks->destroy_offset(this->active_tasks,
+										offsetof(task_t, destroy));
+	this->queued_tasks = linked_list_create();
+	this->passive_tasks = linked_list_create();
+	this->active_tasks = linked_list_create();
+}
+
+/**
+ * move a task of a specific type from the queue to the active list
+ */
+static bool activate_task(private_task_manager_t *this, task_type_t type)
+{
+	iterator_t *iterator;
+	task_t *task;
+	bool found = FALSE;
+
+	iterator = this->queued_tasks->create_iterator(this->queued_tasks, TRUE);
+	while (iterator->iterate(iterator, (void**)&task))
+	{
+		if (task->get_type(task) == type)
+		{
+			DBG2(DBG_IKE, "  activating %N task", task_type_names, type);
+			iterator->remove(iterator);
+			this->active_tasks->insert_last(this->active_tasks, task);
+			found = TRUE;
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+	return found;
+}
+
+/**
+ * Implementation of task_manager_t.retransmit
+ */
+static status_t retransmit(private_task_manager_t *this, u_int32_t message_id)
+{
+	if (message_id == this->initiating.mid)
+	{
+		u_int32_t timeout;
+		job_t *job;
+		iterator_t *iterator;
+		packet_t *packet;
+		task_t *task;
+		ike_mobike_t *mobike = NULL;
+
+		/* check if we are retransmitting a MOBIKE routability check */
+		iterator = this->active_tasks->create_iterator(this->active_tasks, TRUE);
+		while (iterator->iterate(iterator, (void*)&task))
+		{
+			if (task->get_type(task) == IKE_MOBIKE)
+			{
+				mobike = (ike_mobike_t*)task;
+				if (!mobike->is_probing(mobike))
+				{
+					mobike = NULL;
+				}
+				break;
+			}
+		}
+		iterator->destroy(iterator);
+
+		if (mobike == NULL)
+		{
+			if (this->initiating.retransmitted <= this->retransmit_tries)
+			{
+				timeout = (u_int32_t)(this->retransmit_timeout * 1000.0 *
+					pow(this->retransmit_base, this->initiating.retransmitted));
+			}
+			else
+			{
+				DBG1(DBG_IKE, "giving up after %d retransmits",
+					 this->initiating.retransmitted - 1);
+				if (this->ike_sa->get_state(this->ike_sa) != IKE_CONNECTING)
+				{
+					charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+				}
+				return DESTROY_ME;
+			}
+
+			if (this->initiating.retransmitted)
+			{
+				DBG1(DBG_IKE, "retransmit %d of request with message ID %d",
+					 this->initiating.retransmitted, message_id);
+			}
+			packet = this->initiating.packet->clone(this->initiating.packet);
+			charon->sender->send(charon->sender, packet);
+		}
+		else
+		{	/* for routeability checks, we use a more aggressive behavior */
+			if (this->initiating.retransmitted <= ROUTEABILITY_CHECK_TRIES)
+			{
+				timeout = ROUTEABILITY_CHECK_INTERVAL;
+			}
+			else
+			{
+				DBG1(DBG_IKE, "giving up after %d path probings",
+					 this->initiating.retransmitted - 1);
+				charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+				return DESTROY_ME;
+			}
+
+			if (this->initiating.retransmitted)
+			{
+				DBG1(DBG_IKE, "path probing attempt %d",
+					 this->initiating.retransmitted);
+			}
+			mobike->transmit(mobike, this->initiating.packet);
+		}
+
+		this->initiating.retransmitted++;
+		job = (job_t*)retransmit_job_create(this->initiating.mid,
+											this->ike_sa->get_id(this->ike_sa));
+		charon->scheduler->schedule_job_ms(charon->scheduler, job, timeout);
+	}
+	return SUCCESS;
+}
+
+/**
+ * build a request using the active task list
+ * Implementation of task_manager_t.initiate
+ */
+static status_t build_request(private_task_manager_t *this)
+{
+	iterator_t *iterator;
+	task_t *task;
+	message_t *message;
+	host_t *me, *other;
+	status_t status;
+	exchange_type_t exchange = 0;
+
+	if (this->initiating.type != EXCHANGE_TYPE_UNDEFINED)
+	{
+		DBG2(DBG_IKE, "delaying task initiation, exchange in progress");
+		/* do not initiate if we already have a message in the air */
+		return SUCCESS;
+	}
+
+	if (this->active_tasks->get_count(this->active_tasks) == 0)
+	{
+		DBG2(DBG_IKE, "activating new tasks");
+		switch (this->ike_sa->get_state(this->ike_sa))
+		{
+			case IKE_CREATED:
+				activate_task(this, IKE_VENDOR);
+				if (activate_task(this, IKE_INIT))
+				{
+					this->initiating.mid = 0;
+					exchange = IKE_SA_INIT;
+					activate_task(this, IKE_NATD);
+					activate_task(this, IKE_CERT_PRE);
+#ifdef ME
+					/* this task has to be activated before the IKE_AUTHENTICATE
+					 * task, because that task pregenerates the packet after
+					 * which no payloads can be added to the message anymore.
+					 */
+					activate_task(this, IKE_ME);
+#endif /* ME */
+					activate_task(this, IKE_AUTHENTICATE);
+					activate_task(this, IKE_CERT_POST);
+					activate_task(this, IKE_CONFIG);
+					activate_task(this, CHILD_CREATE);
+					activate_task(this, IKE_AUTH_LIFETIME);
+					activate_task(this, IKE_MOBIKE);
+				}
+				break;
+			case IKE_ESTABLISHED:
+				if (activate_task(this, CHILD_CREATE))
+				{
+					exchange = CREATE_CHILD_SA;
+					break;
+				}
+				if (activate_task(this, CHILD_DELETE))
+				{
+					exchange = INFORMATIONAL;
+					break;
+				}
+				if (activate_task(this, CHILD_REKEY))
+				{
+					exchange = CREATE_CHILD_SA;
+					break;
+				}
+				if (activate_task(this, IKE_DELETE))
+				{
+					exchange = INFORMATIONAL;
+					break;
+				}
+				if (activate_task(this, IKE_REKEY))
+				{
+					exchange = CREATE_CHILD_SA;
+					break;
+				}
+				if (activate_task(this, IKE_REAUTH))
+				{
+					exchange = INFORMATIONAL;
+					break;
+				}
+				if (activate_task(this, IKE_MOBIKE))
+				{
+					exchange = INFORMATIONAL;
+					break;
+				}
+				if (activate_task(this, IKE_DPD))
+				{
+					exchange = INFORMATIONAL;
+					break;
+				}
+#ifdef ME
+				if (activate_task(this, IKE_ME))
+				{
+					exchange = ME_CONNECT;
+					break;
+				}
+#endif /* ME */
+			case IKE_REKEYING:
+				if (activate_task(this, IKE_DELETE))
+				{
+					exchange = INFORMATIONAL;
+					break;
+				}
+			case IKE_DELETING:
+			default:
+				break;
+		}
+	}
+	else
+	{
+		DBG2(DBG_IKE, "reinitiating already active tasks");
+		iterator = this->active_tasks->create_iterator(this->active_tasks, TRUE);
+		while (iterator->iterate(iterator, (void**)&task))
+		{
+			DBG2(DBG_IKE, "  %N task", task_type_names, task->get_type(task));
+			switch (task->get_type(task))
+			{
+				case IKE_INIT:
+					exchange = IKE_SA_INIT;
+					break;
+				case IKE_AUTHENTICATE:
+					exchange = IKE_AUTH;
+					break;
+				case CHILD_CREATE:
+				case CHILD_REKEY:
+				case IKE_REKEY:
+					exchange = CREATE_CHILD_SA;
+					break;
+				case IKE_MOBIKE:
+					exchange = INFORMATIONAL;
+				default:
+					continue;
+			}
+			break;
+		}
+		iterator->destroy(iterator);
+	}
+
+	if (exchange == 0)
+	{
+		DBG2(DBG_IKE, "nothing to initiate");
+		/* nothing to do yet... */
+		return SUCCESS;
+	}
+
+	me = this->ike_sa->get_my_host(this->ike_sa);
+	other = this->ike_sa->get_other_host(this->ike_sa);
+
+	message = message_create();
+	message->set_message_id(message, this->initiating.mid);
+	message->set_source(message, me->clone(me));
+	message->set_destination(message, other->clone(other));
+	message->set_exchange_type(message, exchange);
+	this->initiating.type = exchange;
+	this->initiating.retransmitted = 0;
+
+	iterator = this->active_tasks->create_iterator(this->active_tasks, TRUE);
+	while (iterator->iterate(iterator, (void*)&task))
+	{
+		switch (task->build(task, message))
+		{
+			case SUCCESS:
+				/* task completed, remove it */
+				iterator->remove(iterator);
+				task->destroy(task);
+				break;
+			case NEED_MORE:
+				/* processed, but task needs another exchange */
+				break;
+			case FAILED:
+			default:
+				if (this->ike_sa->get_state(this->ike_sa) != IKE_CONNECTING)
+				{
+					charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+				}
+				/* FALL */
+			case DESTROY_ME:
+				/* critical failure, destroy IKE_SA */
+				iterator->destroy(iterator);
+				message->destroy(message);
+				flush(this);
+				return DESTROY_ME;
+		}
+	}
+	iterator->destroy(iterator);
+
+	/* update exchange type if a task changed it */
+	this->initiating.type = message->get_exchange_type(message);
+
+	charon->bus->message(charon->bus, message, FALSE);
+	status = this->ike_sa->generate_message(this->ike_sa, message,
+											&this->initiating.packet);
+	if (status != SUCCESS)
+	{
+		/* message generation failed. There is nothing more to do than to
+		 * close the SA */
+		message->destroy(message);
+		flush(this);
+		charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+		return DESTROY_ME;
+	}
+	message->destroy(message);
+
+	return retransmit(this, this->initiating.mid);
+}
+
+/**
+ * handle an incoming response message
+ */
+static status_t process_response(private_task_manager_t *this,
+								 message_t *message)
+{
+	iterator_t *iterator;
+	task_t *task;
+
+	if (message->get_exchange_type(message) != this->initiating.type)
+	{
+		DBG1(DBG_IKE, "received %N response, but expected %N",
+			 exchange_type_names, message->get_exchange_type(message),
+			 exchange_type_names, this->initiating.type);
+		charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+		return DESTROY_ME;
+	}
+
+	/* catch if we get resetted while processing */
+	this->reset = FALSE;
+	iterator = this->active_tasks->create_iterator(this->active_tasks, TRUE);
+	while (iterator->iterate(iterator, (void*)&task))
+	{
+		switch (task->process(task, message))
+		{
+			case SUCCESS:
+				/* task completed, remove it */
+				iterator->remove(iterator);
+				task->destroy(task);
+				break;
+			case NEED_MORE:
+				/* processed, but task needs another exchange */
+				break;
+			case FAILED:
+			default:
+				charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+				/* FALL */
+			case DESTROY_ME:
+				/* critical failure, destroy IKE_SA */
+				iterator->remove(iterator);
+				iterator->destroy(iterator);
+				task->destroy(task);
+				return DESTROY_ME;
+		}
+		if (this->reset)
+		{	/* start all over again if we were reset */
+			this->reset = FALSE;
+			iterator->destroy(iterator);
+			return build_request(this);
+		}
+	}
+	iterator->destroy(iterator);
+
+	this->initiating.mid++;
+	this->initiating.type = EXCHANGE_TYPE_UNDEFINED;
+	this->initiating.packet->destroy(this->initiating.packet);
+	this->initiating.packet = NULL;
+
+	return build_request(this);
+}
+
+/**
+ * handle exchange collisions
+ */
+static void handle_collisions(private_task_manager_t *this, task_t *task)
+{
+	iterator_t *iterator;
+	task_t *active;
+	task_type_t type;
+
+	type = task->get_type(task);
+
+	/* do we have to check  */
+	if (type == IKE_REKEY || type == CHILD_REKEY ||
+		type == CHILD_DELETE || type == IKE_DELETE || type == IKE_REAUTH)
+	{
+		/* find an exchange collision, and notify these tasks */
+		iterator = this->active_tasks->create_iterator(this->active_tasks, TRUE);
+		while (iterator->iterate(iterator, (void**)&active))
+		{
+			switch (active->get_type(active))
+			{
+				case IKE_REKEY:
+					if (type == IKE_REKEY || type == IKE_DELETE ||
+						type == IKE_REAUTH)
+					{
+						ike_rekey_t *rekey = (ike_rekey_t*)active;
+						rekey->collide(rekey, task);
+						break;
+					}
+					continue;
+				case CHILD_REKEY:
+					if (type == CHILD_REKEY || type == CHILD_DELETE)
+					{
+						child_rekey_t *rekey = (child_rekey_t*)active;
+						rekey->collide(rekey, task);
+						break;
+					}
+					continue;
+				default:
+					continue;
+			}
+			iterator->destroy(iterator);
+			return;
+		}
+		iterator->destroy(iterator);
+	}
+	/* destroy task if not registered in any active task */
+	task->destroy(task);
+}
+
+/**
+ * build a response depending on the "passive" task list
+ */
+static status_t build_response(private_task_manager_t *this, message_t *request)
+{
+	iterator_t *iterator;
+	task_t *task;
+	message_t *message;
+	host_t *me, *other;
+	bool delete = FALSE;
+	status_t status;
+
+	me = request->get_destination(request);
+	other = request->get_source(request);
+
+	message = message_create();
+	message->set_exchange_type(message, request->get_exchange_type(request));
+	/* send response along the path the request came in */
+	message->set_source(message, me->clone(me));
+	message->set_destination(message, other->clone(other));
+	message->set_message_id(message, this->responding.mid);
+	message->set_request(message, FALSE);
+
+	iterator = this->passive_tasks->create_iterator(this->passive_tasks, TRUE);
+	while (iterator->iterate(iterator, (void*)&task))
+	{
+		switch (task->build(task, message))
+		{
+			case SUCCESS:
+				/* task completed, remove it */
+				iterator->remove(iterator);
+				handle_collisions(this, task);
+			case NEED_MORE:
+				/* processed, but task needs another exchange */
+				break;
+			case FAILED:
+			default:
+				charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+				/* FALL */
+			case DESTROY_ME:
+				/* destroy IKE_SA, but SEND response first */
+				delete = TRUE;
+				break;
+		}
+		if (delete)
+		{
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	/* remove resonder SPI if IKE_SA_INIT failed */
+	if (delete && request->get_exchange_type(request) == IKE_SA_INIT)
+	{
+		ike_sa_id_t *id = this->ike_sa->get_id(this->ike_sa);
+		id->set_responder_spi(id, 0);
+	}
+
+	/* message complete, send it */
+	DESTROY_IF(this->responding.packet);
+	this->responding.packet = NULL;
+	charon->bus->message(charon->bus, message, FALSE);
+	status = this->ike_sa->generate_message(this->ike_sa, message,
+											&this->responding.packet);
+	message->destroy(message);
+	if (status != SUCCESS)
+	{
+		charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+		return DESTROY_ME;
+	}
+
+	charon->sender->send(charon->sender,
+						 this->responding.packet->clone(this->responding.packet));
+	if (delete)
+	{
+		return DESTROY_ME;
+	}
+	return SUCCESS;
+}
+
+/**
+ * handle an incoming request message
+ */
+static status_t process_request(private_task_manager_t *this,
+								message_t *message)
+{
+	enumerator_t *enumerator;
+	iterator_t *iterator;
+	task_t *task = NULL;
+	payload_t *payload;
+	notify_payload_t *notify;
+	delete_payload_t *delete;
+
+	if (this->passive_tasks->get_count(this->passive_tasks) == 0)
+	{	/* create tasks depending on request type, if not already some queued */
+		switch (message->get_exchange_type(message))
+		{
+			case IKE_SA_INIT:
+			{
+				task = (task_t*)ike_vendor_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				task = (task_t*)ike_init_create(this->ike_sa, FALSE, NULL);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				task = (task_t*)ike_natd_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				task = (task_t*)ike_cert_pre_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+#ifdef ME
+				task = (task_t*)ike_me_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+#endif /* ME */
+				task = (task_t*)ike_auth_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				task = (task_t*)ike_cert_post_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				task = (task_t*)ike_config_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				task = (task_t*)child_create_create(this->ike_sa, NULL, FALSE,
+													NULL, NULL);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				task = (task_t*)ike_auth_lifetime_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				task = (task_t*)ike_mobike_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				break;
+			}
+			case CREATE_CHILD_SA:
+			{	/* FIXME: we should prevent this on mediation connections */
+				bool notify_found = FALSE, ts_found = FALSE;
+				enumerator = message->create_payload_enumerator(message);
+				while (enumerator->enumerate(enumerator, &payload))
+				{
+					switch (payload->get_type(payload))
+					{
+						case NOTIFY:
+						{	/* if we find a rekey notify, its CHILD_SA rekeying */
+							notify = (notify_payload_t*)payload;
+							if (notify->get_notify_type(notify) == REKEY_SA &&
+								(notify->get_protocol_id(notify) == PROTO_AH ||
+								 notify->get_protocol_id(notify) == PROTO_ESP))
+							{
+								notify_found = TRUE;
+							}
+							break;
+						}
+						case TRAFFIC_SELECTOR_INITIATOR:
+						case TRAFFIC_SELECTOR_RESPONDER:
+						{	/* if we don't find a TS, its IKE rekeying */
+							ts_found = TRUE;
+							break;
+						}
+						default:
+							break;
+					}
+				}
+				enumerator->destroy(enumerator);
+
+				if (ts_found)
+				{
+					if (notify_found)
+					{
+						task = (task_t*)child_rekey_create(this->ike_sa,
+														   PROTO_NONE, 0);
+					}
+					else
+					{
+						task = (task_t*)child_create_create(this->ike_sa, NULL,
+															FALSE, NULL, NULL);
+					}
+				}
+				else
+				{
+					task = (task_t*)ike_rekey_create(this->ike_sa, FALSE);
+				}
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				break;
+			}
+			case INFORMATIONAL:
+			{
+				enumerator = message->create_payload_enumerator(message);
+				while (enumerator->enumerate(enumerator, &payload))
+				{
+					switch (payload->get_type(payload))
+					{
+						case NOTIFY:
+						{
+							notify = (notify_payload_t*)payload;
+							switch (notify->get_notify_type(notify))
+							{
+								case ADDITIONAL_IP4_ADDRESS:
+								case ADDITIONAL_IP6_ADDRESS:
+								case NO_ADDITIONAL_ADDRESSES:
+								case UPDATE_SA_ADDRESSES:
+								case NO_NATS_ALLOWED:
+								case UNACCEPTABLE_ADDRESSES:
+								case UNEXPECTED_NAT_DETECTED:
+								case COOKIE2:
+								case NAT_DETECTION_SOURCE_IP:
+								case NAT_DETECTION_DESTINATION_IP:
+									task = (task_t*)ike_mobike_create(
+															this->ike_sa, FALSE);
+									break;
+								case AUTH_LIFETIME:
+									task = (task_t*)ike_auth_lifetime_create(
+															this->ike_sa, FALSE);
+									break;
+								default:
+									break;
+							}
+							break;
+						}
+						case DELETE:
+						{
+							delete = (delete_payload_t*)payload;
+							if (delete->get_protocol_id(delete) == PROTO_IKE)
+							{
+								task = (task_t*)ike_delete_create(this->ike_sa,
+																FALSE);
+							}
+							else
+							{
+								task = (task_t*)child_delete_create(this->ike_sa,
+																PROTO_NONE, 0);
+							}
+							break;
+						}
+						default:
+							break;
+					}
+					if (task)
+					{
+						break;
+					}
+				}
+				enumerator->destroy(enumerator);
+
+				if (task == NULL)
+				{
+					task = (task_t*)ike_dpd_create(FALSE);
+				}
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+				break;
+			}
+#ifdef ME
+			case ME_CONNECT:
+			{
+				task = (task_t*)ike_me_create(this->ike_sa, FALSE);
+				this->passive_tasks->insert_last(this->passive_tasks, task);
+			}
+#endif /* ME */
+			default:
+				break;
+		}
+	}
+
+	/* let the tasks process the message */
+	iterator = this->passive_tasks->create_iterator(this->passive_tasks, TRUE);
+	while (iterator->iterate(iterator, (void*)&task))
+	{
+		switch (task->process(task, message))
+		{
+			case SUCCESS:
+				/* task completed, remove it */
+				iterator->remove(iterator);
+				task->destroy(task);
+				break;
+			case NEED_MORE:
+				/* processed, but task needs at least another call to build() */
+				break;
+			case FAILED:
+			default:
+				charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+				/* FALL */
+			case DESTROY_ME:
+				/* critical failure, destroy IKE_SA */
+				iterator->remove(iterator);
+				iterator->destroy(iterator);
+				task->destroy(task);
+				return DESTROY_ME;
+		}
+	}
+	iterator->destroy(iterator);
+
+	return build_response(this, message);
+}
+
+/**
+ * Implementation of task_manager_t.process_message
+ */
+static status_t process_message(private_task_manager_t *this, message_t *msg)
+{
+	u_int32_t mid = msg->get_message_id(msg);
+
+	if (msg->get_request(msg))
+	{
+		if (mid == this->responding.mid)
+		{
+			charon->bus->message(charon->bus, msg, TRUE);
+			if (process_request(this, msg) != SUCCESS)
+			{
+				flush(this);
+				return DESTROY_ME;
+			}
+			this->responding.mid++;
+		}
+		else if ((mid == this->responding.mid - 1) && this->responding.packet)
+		{
+			packet_t *clone;
+			host_t *me, *other;
+
+			DBG1(DBG_IKE, "received retransmit of request with ID %d, "
+				 "retransmitting response", mid);
+			clone = this->responding.packet->clone(this->responding.packet);
+			me = msg->get_destination(msg);
+			other = msg->get_source(msg);
+			clone->set_source(clone, me->clone(me));
+			clone->set_destination(clone, other->clone(other));
+			charon->sender->send(charon->sender, clone);
+		}
+		else
+		{
+			DBG1(DBG_IKE, "received message ID %d, expected %d. Ignored",
+				 mid, this->responding.mid);
+		}
+	}
+	else
+	{
+		if (mid == this->initiating.mid)
+		{
+			charon->bus->message(charon->bus, msg, TRUE);
+			if (process_response(this, msg) != SUCCESS)
+			{
+				flush(this);
+				return DESTROY_ME;
+			}
+		}
+		else
+		{
+			DBG1(DBG_IKE, "received message ID %d, expected %d. Ignored",
+				 mid, this->initiating.mid);
+			return SUCCESS;
+		}
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_manager_t.queue_task
+ */
+static void queue_task(private_task_manager_t *this, task_t *task)
+{
+	if (task->get_type(task) == IKE_MOBIKE)
+	{	/*  there is no need to queue more than one mobike task */
+		iterator_t *iterator;
+		task_t *current;
+
+		iterator = this->queued_tasks->create_iterator(this->queued_tasks, TRUE);
+		while (iterator->iterate(iterator, (void**)&current))
+		{
+			if (current->get_type(current) == IKE_MOBIKE)
+			{
+				iterator->destroy(iterator);
+				task->destroy(task);
+				return;
+			}
+		}
+		iterator->destroy(iterator);
+	}
+	DBG2(DBG_IKE, "queueing %N task", task_type_names, task->get_type(task));
+	this->queued_tasks->insert_last(this->queued_tasks, task);
+}
+
+/**
+ * Implementation of task_manager_t.adopt_tasks
+ */
+static void adopt_tasks(private_task_manager_t *this, private_task_manager_t *other)
+{
+	task_t *task;
+
+	/* move queued tasks from other to this */
+	while (other->queued_tasks->remove_last(other->queued_tasks,
+												(void**)&task) == SUCCESS)
+	{
+		DBG2(DBG_IKE, "migrating %N task", task_type_names, task->get_type(task));
+		task->migrate(task, this->ike_sa);
+		this->queued_tasks->insert_first(this->queued_tasks, task);
+	}
+}
+
+/**
+ * Implementation of task_manager_t.busy
+ */
+static bool busy(private_task_manager_t *this)
+{
+	return (this->active_tasks->get_count(this->active_tasks) > 0);
+}
+
+/**
+ * Implementation of task_manager_t.reset
+ */
+static void reset(private_task_manager_t *this,
+				  u_int32_t initiate, u_int32_t respond)
+{
+	task_t *task;
+
+	/* reset message counters and retransmit packets */
+	DESTROY_IF(this->responding.packet);
+	DESTROY_IF(this->initiating.packet);
+	this->responding.packet = NULL;
+	this->initiating.packet = NULL;
+	if (initiate != UINT_MAX)
+	{
+		this->initiating.mid = initiate;
+	}
+	if (respond != UINT_MAX)
+	{
+		this->responding.mid = respond;
+	}
+	this->initiating.type = EXCHANGE_TYPE_UNDEFINED;
+
+	/* reset active tasks */
+	while (this->active_tasks->remove_last(this->active_tasks,
+										   (void**)&task) == SUCCESS)
+	{
+		task->migrate(task, this->ike_sa);
+		this->queued_tasks->insert_first(this->queued_tasks, task);
+	}
+
+	this->reset = TRUE;
+}
+
+/**
+ * Implementation of task_manager_t.destroy
+ */
+static void destroy(private_task_manager_t *this)
+{
+	flush(this);
+
+	this->active_tasks->destroy(this->active_tasks);
+	this->queued_tasks->destroy(this->queued_tasks);
+	this->passive_tasks->destroy(this->passive_tasks);
+
+	DESTROY_IF(this->responding.packet);
+	DESTROY_IF(this->initiating.packet);
+	free(this);
+}
+
+/*
+ * see header file
+ */
+task_manager_t *task_manager_create(ike_sa_t *ike_sa)
+{
+	private_task_manager_t *this = malloc_thing(private_task_manager_t);
+
+	this->public.process_message = (status_t(*)(task_manager_t*,message_t*))process_message;
+	this->public.queue_task = (void(*)(task_manager_t*,task_t*))queue_task;
+	this->public.initiate = (status_t(*)(task_manager_t*))build_request;
+	this->public.retransmit = (status_t(*)(task_manager_t*,u_int32_t))retransmit;
+	this->public.reset = (void(*)(task_manager_t*,u_int32_t,u_int32_t))reset;
+	this->public.adopt_tasks = (void(*)(task_manager_t*,task_manager_t*))adopt_tasks;
+	this->public.busy = (bool(*)(task_manager_t*))busy;
+	this->public.destroy = (void(*)(task_manager_t*))destroy;
+
+	this->ike_sa = ike_sa;
+	this->responding.packet = NULL;
+	this->initiating.packet = NULL;
+	this->responding.mid = 0;
+	this->initiating.mid = 0;
+	this->initiating.type = EXCHANGE_TYPE_UNDEFINED;
+	this->queued_tasks = linked_list_create();
+	this->active_tasks = linked_list_create();
+	this->passive_tasks = linked_list_create();
+	this->reset = FALSE;
+
+	this->retransmit_tries = lib->settings->get_int(lib->settings,
+								"charon.retransmit_tries", RETRANSMIT_TRIES);
+	this->retransmit_timeout = lib->settings->get_double(lib->settings,
+								"charon.retransmit_timeout", RETRANSMIT_TIMEOUT);
+	this->retransmit_base = lib->settings->get_double(lib->settings,
+								"charon.retransmit_base", RETRANSMIT_BASE);
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/task_manager.h b/src/libcharon/sa/task_manager.h
new file mode 100644
index 000000000..731ed4898
--- /dev/null
+++ b/src/libcharon/sa/task_manager.h
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2006 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup task_manager task_manager
+ * @{ @ingroup sa
+ */
+
+#ifndef TASK_MANAGER_H_
+#define TASK_MANAGER_H_
+
+typedef struct task_manager_t task_manager_t;
+
+#include <limits.h>
+
+#include <library.h>
+#include <encoding/message.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * First retransmit timeout in seconds.
+ */
+#define RETRANSMIT_TIMEOUT 4.0
+
+/**
+ * Base which is raised to the power of the retransmission try.
+ */
+#define RETRANSMIT_BASE 1.8
+
+/**
+ * Number of retransmits done before giving up.
+ */
+#define RETRANSMIT_TRIES 5
+
+/**
+ * Interval for mobike routability checks in ms.
+ */
+#define ROUTEABILITY_CHECK_INTERVAL 2500
+
+/**
+ * Number of routability checks before giving up
+ */
+#define ROUTEABILITY_CHECK_TRIES 10
+
+
+/**
+ * The task manager, juggles task and handles message exchanges.
+ *
+ * On incoming requests, the task manager creates new tasks on demand and
+ * juggles the request through all available tasks. Each task inspects the
+ * request and adds payloads as necessary to the response.
+ * On outgoing requests, the task manager delivers the request through the tasks
+ * to build it, the response gets processed by each task to complete.
+ * The task manager has an internal Queue to store task which should get
+ * completed.
+ * For the initial IKE_SA setup, several tasks are queued: One for the
+ * unauthenticated IKE_SA setup, one for authentication, one for CHILD_SA setup
+ * and maybe one for virtual IP assignement.
+ * The task manager is also responsible for retransmission. It uses a backoff
+ * algorithm. The timeout is calculated using
+ * RETRANSMIT_TIMEOUT * (RETRANSMIT_BASE ** try).
+ * When try reaches RETRANSMIT_TRIES, retransmission is given up.
+ *
+ * Using an initial TIMEOUT of 4s, a BASE of 1.8, and 5 TRIES gives us:
+ * @verbatim
+                   | relative | absolute
+   ---------------------------------------------------------
+   4s * (1.8 ** 0) =    4s         4s
+   4s * (1.8 ** 1) =    7s        11s
+   4s * (1.8 ** 2) =   13s        24s
+   4s * (1.8 ** 3) =   23s        47s
+   4s * (1.8 ** 4) =   42s        89s
+   4s * (1.8 ** 5) =   76s       165s
+
+   @endverbatim
+ * The peer is considered dead after 2min 45s when no reply comes in.
+ */
+struct task_manager_t {
+
+	/**
+	 * Process an incoming message.
+	 *
+	 * @param message		message to add payloads to
+	 * @return
+	 *						- DESTROY_ME if IKE_SA must be closed
+	 *						- SUCCESS otherwise
+	 */
+	status_t (*process_message) (task_manager_t *this, message_t *message);
+
+	/**
+	 * Initiate an exchange with the currently queued tasks.
+	 */
+	status_t (*initiate) (task_manager_t *this);
+
+	/**
+	 * Queue a task in the manager.
+	 *
+	 * @param task			task to queue
+	 */
+	void (*queue_task) (task_manager_t *this, task_t *task);
+
+	/**
+	 * Retransmit a request if it hasn't been acknowledged yet.
+	 *
+	 * A return value of INVALID_STATE means that the message was already
+	 * acknowledged and has not to be retransmitted. A return value of SUCCESS
+	 * means retransmission was required and the message has been resent.
+	 *
+	 * @param message_id	ID of the message to retransmit
+	 * @return
+	 *						- INVALID_STATE if retransmission not required
+	 *						- SUCCESS if retransmission sent
+	 */
+	status_t (*retransmit) (task_manager_t *this, u_int32_t message_id);
+
+	/**
+	 * Migrate all tasks from other to this.
+	 *
+	 * To rekey or reestablish an IKE_SA completely, all queued or active
+	 * tasks should get migrated to the new IKE_SA.
+	 *
+	 * @param other			manager which gives away its tasks
+	 */
+	void (*adopt_tasks) (task_manager_t *this, task_manager_t *other);
+
+	/**
+	 * Reset message ID counters of the task manager.
+	 *
+	 * The IKEv2 protocol requires to restart exchanges with message IDs
+	 * reset to zero (INVALID_KE_PAYLOAD, COOKIES, ...). The reset() method
+	 * resets the message IDs and resets all active tasks using the migrate()
+	 * method.
+	 * Use a value of UINT_MAX to keep the current message ID.
+	 *
+	 * @param initiate		message ID to initiate exchanges (send)
+	 * @param respond		message ID to respond to exchanges (expect)
+	 */
+	void (*reset) (task_manager_t *this, u_int32_t initiate, u_int32_t respond);
+
+	/**
+	 * Check if we are currently waiting for a reply.
+	 *
+	 * @return				TRUE if we are waiting, FALSE otherwise
+	 */
+	bool (*busy) (task_manager_t *this);
+
+	/**
+	 * Destroy the task_manager_t.
+	 */
+	void (*destroy) (task_manager_t *this);
+};
+
+/**
+ * Create an instance of the task manager.
+ *
+ * @param ike_sa		IKE_SA to manage.
+ */
+task_manager_t *task_manager_create(ike_sa_t *ike_sa);
+
+#endif /** TASK_MANAGER_H_ @}*/
diff --git a/src/libcharon/sa/tasks/child_create.c b/src/libcharon/sa/tasks/child_create.c
new file mode 100644
index 000000000..bea4f73d5
--- /dev/null
+++ b/src/libcharon/sa/tasks/child_create.c
@@ -0,0 +1,1351 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2005-2008 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "child_create.h"
+
+#include <daemon.h>
+#include <crypto/diffie_hellman.h>
+#include <credentials/certificates/x509.h>
+#include <encoding/payloads/sa_payload.h>
+#include <encoding/payloads/ke_payload.h>
+#include <encoding/payloads/ts_payload.h>
+#include <encoding/payloads/nonce_payload.h>
+#include <encoding/payloads/notify_payload.h>
+#include <processing/jobs/delete_ike_sa_job.h>
+#include <processing/jobs/inactivity_job.h>
+
+
+typedef struct private_child_create_t private_child_create_t;
+
+/**
+ * Private members of a child_create_t task.
+ */
+struct private_child_create_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	child_create_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * nonce chosen by us
+	 */
+	chunk_t my_nonce;
+
+	/**
+	 * nonce chosen by peer
+	 */
+	chunk_t other_nonce;
+
+	/**
+	 * config to create the CHILD_SA from
+	 */
+	child_cfg_t *config;
+
+	/**
+	 * list of proposal candidates
+	 */
+	linked_list_t *proposals;
+
+	/**
+	 * selected proposal to use for CHILD_SA
+	 */
+	proposal_t *proposal;
+
+	/**
+	 * traffic selectors for initiators side
+	 */
+	linked_list_t *tsi;
+
+	/**
+	 * traffic selectors for responders side
+	 */
+	linked_list_t *tsr;
+
+	/**
+	 * source of triggering packet
+	 */
+	traffic_selector_t *packet_tsi;
+
+	/**
+	 * destination of triggering packet
+	 */
+	traffic_selector_t *packet_tsr;
+
+	/**
+	 * optional diffie hellman exchange
+	 */
+	diffie_hellman_t *dh;
+
+	/**
+	 * group used for DH exchange
+	 */
+	diffie_hellman_group_t dh_group;
+
+	/**
+	 * IKE_SAs keymat
+	 */
+	keymat_t *keymat;
+
+	/**
+	 * mode the new CHILD_SA uses (transport/tunnel/beet)
+	 */
+	ipsec_mode_t mode;
+
+	/**
+	 * IPComp transform to use
+	 */
+	ipcomp_transform_t ipcomp;
+
+	/**
+	 * IPComp transform proposed or accepted by the other peer
+	 */
+	ipcomp_transform_t ipcomp_received;
+
+	/**
+	 * Own allocated SPI
+	 */
+	u_int32_t my_spi;
+
+	/**
+	 * SPI received in proposal
+	 */
+	u_int32_t other_spi;
+
+	/**
+	 * Own allocated Compression Parameter Index (CPI)
+	 */
+	u_int16_t my_cpi;
+
+	/**
+	 * Other Compression Parameter Index (CPI), received via IPCOMP_SUPPORTED
+	 */
+	u_int16_t other_cpi;
+
+	/**
+	 * reqid to use if we are rekeying
+	 */
+	u_int32_t reqid;
+
+	/**
+	 * CHILD_SA which gets established
+	 */
+	child_sa_t *child_sa;
+
+	/**
+	 * successfully established the CHILD?
+	 */
+	bool established;
+
+	/**
+	 * whether the CHILD_SA rekeys an existing one
+	 */
+	bool rekey;
+};
+
+/**
+ * get the nonce from a message
+ */
+static status_t get_nonce(message_t *message, chunk_t *nonce)
+{
+	nonce_payload_t *payload;
+
+	payload = (nonce_payload_t*)message->get_payload(message, NONCE);
+	if (payload == NULL)
+	{
+		return FAILED;
+	}
+	*nonce = payload->get_nonce(payload);
+	return NEED_MORE;
+}
+
+/**
+ * generate a new nonce to include in a CREATE_CHILD_SA message
+ */
+static status_t generate_nonce(chunk_t *nonce)
+{
+	rng_t *rng;
+
+	rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
+	if (!rng)
+	{
+		DBG1(DBG_IKE, "error generating nonce value, no RNG found");
+		return FAILED;
+	}
+	rng->allocate_bytes(rng, NONCE_SIZE, nonce);
+	rng->destroy(rng);
+	return SUCCESS;
+}
+
+/**
+ * Check a list of traffic selectors if any selector belongs to host
+ */
+static bool ts_list_is_host(linked_list_t *list, host_t *host)
+{
+	traffic_selector_t *ts;
+	bool is_host = TRUE;
+	iterator_t *iterator = list->create_iterator(list, TRUE);
+
+	while (is_host && iterator->iterate(iterator, (void**)&ts))
+	{
+		is_host = is_host && ts->is_host(ts, host);
+	}
+	iterator->destroy(iterator);
+	return is_host;
+}
+
+/**
+ * Allocate SPIs and update proposals
+ */
+static bool allocate_spi(private_child_create_t *this)
+{
+	enumerator_t *enumerator;
+	proposal_t *proposal;
+
+	/* TODO: allocate additional SPI for AH if we have such proposals */
+	this->my_spi = this->child_sa->alloc_spi(this->child_sa, PROTO_ESP);
+	if (this->my_spi)
+	{
+		if (this->initiator)
+		{
+			enumerator = this->proposals->create_enumerator(this->proposals);
+			while (enumerator->enumerate(enumerator, &proposal))
+			{
+				proposal->set_spi(proposal, this->my_spi);
+			}
+			enumerator->destroy(enumerator);
+		}
+		else
+		{
+			this->proposal->set_spi(this->proposal, this->my_spi);
+		}
+		return TRUE;
+	}
+	return FALSE;
+}
+
+/**
+ * Schedule inactivity timeout for CHILD_SA with reqid, if enabled
+ */
+static void schedule_inactivity_timeout(private_child_create_t *this)
+{
+	u_int32_t timeout;
+	bool close_ike;
+
+	timeout = this->config->get_inactivity(this->config);
+	if (timeout)
+	{
+		close_ike = lib->settings->get_bool(lib->settings,
+										"charon.inactivity_close_ike", FALSE);
+		charon->scheduler->schedule_job(charon->scheduler, (job_t*)
+				inactivity_job_create(this->child_sa->get_reqid(this->child_sa),
+									  timeout, close_ike), timeout);
+	}
+}
+
+/**
+ * Install a CHILD_SA for usage, return value:
+ * - FAILED: no acceptable proposal
+ * - INVALID_ARG: diffie hellman group inacceptable
+ * - NOT_FOUND: TS inacceptable
+ */
+static status_t select_and_install(private_child_create_t *this, bool no_dh)
+{
+	status_t status, status_i, status_o;
+	chunk_t nonce_i, nonce_r;
+	chunk_t encr_i = chunk_empty, encr_r = chunk_empty;
+	chunk_t integ_i = chunk_empty, integ_r = chunk_empty;
+	linked_list_t *my_ts, *other_ts;
+	host_t *me, *other, *other_vip, *my_vip;
+	bool private;
+
+	if (this->proposals == NULL)
+	{
+		DBG1(DBG_IKE, "SA payload missing in message");
+		return FAILED;
+	}
+	if (this->tsi == NULL || this->tsr == NULL)
+	{
+		DBG1(DBG_IKE, "TS payloads missing in message");
+		return NOT_FOUND;
+	}
+
+	me = this->ike_sa->get_my_host(this->ike_sa);
+	other = this->ike_sa->get_other_host(this->ike_sa);
+	my_vip = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
+	other_vip = this->ike_sa->get_virtual_ip(this->ike_sa, FALSE);
+
+	private = this->ike_sa->supports_extension(this->ike_sa, EXT_STRONGSWAN);
+	this->proposal = this->config->select_proposal(this->config,
+											this->proposals, no_dh, private);
+	if (this->proposal == NULL)
+	{
+		DBG1(DBG_IKE, "no acceptable proposal found");
+		return FAILED;
+	}
+	this->other_spi = this->proposal->get_spi(this->proposal);
+
+	if (!this->initiator && !allocate_spi(this))
+	{	/* responder has no SPI allocated yet */
+		DBG1(DBG_IKE, "allocating SPI failed");
+		return FAILED;
+	}
+	this->child_sa->set_proposal(this->child_sa, this->proposal);
+
+	if (!this->proposal->has_dh_group(this->proposal, this->dh_group))
+	{
+		u_int16_t group;
+
+		if (this->proposal->get_algorithm(this->proposal, DIFFIE_HELLMAN_GROUP,
+										  &group, NULL))
+		{
+			DBG1(DBG_IKE, "DH group %N inacceptable, requesting %N",
+				 diffie_hellman_group_names, this->dh_group,
+				 diffie_hellman_group_names, group);
+			this->dh_group = group;
+			return INVALID_ARG;
+		}
+		/* the selected proposal does not use a DH group */
+		DBG1(DBG_IKE, "ignoring KE exchange, agreed on a non-PFS proposal");
+		DESTROY_IF(this->dh);
+		this->dh = NULL;
+		this->dh_group = MODP_NONE;
+	}
+
+	if (my_vip == NULL)
+	{
+		my_vip = me;
+	}
+	if (other_vip == NULL)
+	{
+		other_vip = other;
+	}
+
+	if (this->initiator)
+	{
+		nonce_i = this->my_nonce;
+		nonce_r = this->other_nonce;
+		my_ts = this->tsi;
+		other_ts = this->tsr;
+	}
+	else
+	{
+		nonce_r = this->my_nonce;
+		nonce_i = this->other_nonce;
+		my_ts = this->tsr;
+		other_ts = this->tsi;
+	}
+	my_ts = this->config->get_traffic_selectors(this->config, TRUE, my_ts,
+												my_vip);
+	other_ts = this->config->get_traffic_selectors(this->config, FALSE, other_ts,
+												   other_vip);
+
+	if (my_ts->get_count(my_ts) == 0 || other_ts->get_count(other_ts) == 0)
+	{
+		my_ts->destroy_offset(my_ts, offsetof(traffic_selector_t, destroy));
+		other_ts->destroy_offset(other_ts, offsetof(traffic_selector_t, destroy));
+		DBG1(DBG_IKE, "no acceptable traffic selectors found");
+		return NOT_FOUND;
+	}
+
+	this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
+	this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
+	if (this->initiator)
+	{
+		this->tsi = my_ts;
+		this->tsr = other_ts;
+	}
+	else
+	{
+		this->tsr = my_ts;
+		this->tsi = other_ts;
+	}
+
+	if (!this->initiator)
+	{
+		/* check if requested mode is acceptable, downgrade if required */
+		switch (this->mode)
+		{
+			case MODE_TRANSPORT:
+				if (!this->config->use_proxy_mode(this->config) &&
+					   (!ts_list_is_host(this->tsi, other) ||
+						!ts_list_is_host(this->tsr, me))
+				   )
+				{
+					this->mode = MODE_TUNNEL;
+					DBG1(DBG_IKE, "not using transport mode, not host-to-host");
+				}
+				else if (this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY))
+				{
+					this->mode = MODE_TUNNEL;
+					DBG1(DBG_IKE, "not using transport mode, connection NATed");
+				}
+				break;
+			case MODE_BEET:
+				if (!ts_list_is_host(this->tsi, NULL) ||
+					!ts_list_is_host(this->tsr, NULL))
+				{
+					this->mode = MODE_TUNNEL;
+					DBG1(DBG_IKE, "not using BEET mode, not host-to-host");
+				}
+				break;
+			default:
+				break;
+		}
+	}
+
+	/* check for any certificate-based IP address block constraints */
+	if (this->mode == MODE_BEET || this->mode == MODE_TUNNEL)
+	{
+		auth_cfg_t *auth;
+		enumerator_t *auth_enum;
+		certificate_t *cert = NULL;
+
+		auth_enum = this->ike_sa->create_auth_cfg_enumerator(this->ike_sa, FALSE);
+		while (auth_enum->enumerate(auth_enum, &auth))
+		{
+			cert = auth->get(auth, AUTH_HELPER_SUBJECT_CERT);
+			if (cert)
+			{
+				break;
+			}
+		}
+		auth_enum->destroy(auth_enum);
+
+		if (cert && cert->get_type(cert) == CERT_X509)
+		{
+			x509_t *x509 = (x509_t*)cert;
+
+			if (x509->get_flags(x509) & X509_IP_ADDR_BLOCKS)
+			{
+				enumerator_t *enumerator, *block_enum;
+				traffic_selector_t *ts, *block_ts;
+
+				DBG1(DBG_IKE, "checking certificate-based traffic selector "
+							  "constraints [RFC 3779]");
+				enumerator = other_ts->create_enumerator(other_ts);
+				while (enumerator->enumerate(enumerator, &ts))
+				{
+					bool contained = FALSE;
+
+					block_enum = x509->create_ipAddrBlock_enumerator(x509);
+					while (block_enum->enumerate(block_enum, &block_ts))
+					{
+						if (ts->is_contained_in(ts, block_ts))
+						{
+							DBG1(DBG_IKE, "  TS %R is contained in address block"
+										  " constraint %R", ts, block_ts);
+							contained = TRUE;
+							break;
+						}
+					}
+					block_enum->destroy(block_enum);
+
+					if (!contained)
+					{
+						DBG1(DBG_IKE, "  TS %R is not contained in any"
+									  " address block constraint", ts);
+						enumerator->destroy(enumerator);
+						return FAILED;
+					}
+				}
+				enumerator->destroy(enumerator);
+			}
+		}
+	}
+
+	this->child_sa->set_state(this->child_sa, CHILD_INSTALLING);
+	this->child_sa->set_ipcomp(this->child_sa, this->ipcomp);
+	this->child_sa->set_mode(this->child_sa, this->mode);
+	this->child_sa->set_protocol(this->child_sa,
+								 this->proposal->get_protocol(this->proposal));
+
+	if (this->my_cpi == 0 || this->other_cpi == 0 || this->ipcomp == IPCOMP_NONE)
+	{
+		this->my_cpi = this->other_cpi = 0;
+		this->ipcomp = IPCOMP_NONE;
+	}
+	status_i = status_o = FAILED;
+	if (this->keymat->derive_child_keys(this->keymat, this->proposal,
+			this->dh, nonce_i, nonce_r, &encr_i, &integ_i, &encr_r, &integ_r))
+	{
+		if (this->initiator)
+		{
+			status_i = this->child_sa->install(this->child_sa, encr_r, integ_r,
+					this->my_spi, this->my_cpi, TRUE, my_ts, other_ts);
+			status_o = this->child_sa->install(this->child_sa, encr_i, integ_i,
+					this->other_spi, this->other_cpi, FALSE, my_ts, other_ts);
+		}
+		else
+		{
+			status_i = this->child_sa->install(this->child_sa, encr_i, integ_i,
+					this->my_spi, this->my_cpi, TRUE, my_ts, other_ts);
+			status_o = this->child_sa->install(this->child_sa, encr_r, integ_r,
+					this->other_spi, this->other_cpi, FALSE, my_ts, other_ts);
+		}
+	}
+	chunk_clear(&integ_i);
+	chunk_clear(&integ_r);
+	chunk_clear(&encr_i);
+	chunk_clear(&encr_r);
+
+	if (status_i != SUCCESS || status_o != SUCCESS)
+	{
+		DBG1(DBG_IKE, "unable to install %s%s%sIPsec SA (SAD) in kernel",
+			(status_i != SUCCESS) ? "inbound " : "",
+			(status_i != SUCCESS && status_o != SUCCESS) ? "and ": "",
+			(status_o != SUCCESS) ? "outbound " : "");
+		return FAILED;
+	}
+
+	status = this->child_sa->add_policies(this->child_sa, my_ts, other_ts);
+	if (status != SUCCESS)
+	{
+		DBG1(DBG_IKE, "unable to install IPsec policies (SPD) in kernel");
+		return NOT_FOUND;
+	}
+
+	charon->bus->child_keys(charon->bus, this->child_sa, this->dh,
+							nonce_i, nonce_r);
+
+	/* add to IKE_SA, and remove from task */
+	this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
+	this->ike_sa->add_child_sa(this->ike_sa, this->child_sa);
+	this->established = TRUE;
+
+	if (!this->rekey)
+	{	/* a rekeyed SA uses the same reqid, no need for a new job */
+		schedule_inactivity_timeout(this);
+	}
+	return SUCCESS;
+}
+
+/**
+ * build the payloads for the message
+ */
+static void build_payloads(private_child_create_t *this, message_t *message)
+{
+	sa_payload_t *sa_payload;
+	nonce_payload_t *nonce_payload;
+	ke_payload_t *ke_payload;
+	ts_payload_t *ts_payload;
+
+	/* add SA payload */
+	if (this->initiator)
+	{
+		sa_payload = sa_payload_create_from_proposal_list(this->proposals);
+	}
+	else
+	{
+		sa_payload = sa_payload_create_from_proposal(this->proposal);
+	}
+	message->add_payload(message, (payload_t*)sa_payload);
+
+	/* add nonce payload if not in IKE_AUTH */
+	if (message->get_exchange_type(message) == CREATE_CHILD_SA)
+	{
+		nonce_payload = nonce_payload_create();
+		nonce_payload->set_nonce(nonce_payload, this->my_nonce);
+		message->add_payload(message, (payload_t*)nonce_payload);
+	}
+
+	/* diffie hellman exchange, if PFS enabled */
+	if (this->dh)
+	{
+		ke_payload = ke_payload_create_from_diffie_hellman(this->dh);
+		message->add_payload(message, (payload_t*)ke_payload);
+	}
+
+	/* add TSi/TSr payloads */
+	ts_payload = ts_payload_create_from_traffic_selectors(TRUE, this->tsi);
+	message->add_payload(message, (payload_t*)ts_payload);
+	ts_payload = ts_payload_create_from_traffic_selectors(FALSE, this->tsr);
+	message->add_payload(message, (payload_t*)ts_payload);
+
+	/* add a notify if we are not in tunnel mode */
+	switch (this->mode)
+	{
+		case MODE_TRANSPORT:
+			message->add_notify(message, FALSE, USE_TRANSPORT_MODE, chunk_empty);
+			break;
+		case MODE_BEET:
+			message->add_notify(message, FALSE, USE_BEET_MODE, chunk_empty);
+			break;
+		default:
+			break;
+	}
+}
+
+/**
+ * Adds an IPCOMP_SUPPORTED notify to the message, allocating a CPI
+ */
+static void add_ipcomp_notify(private_child_create_t *this,
+								  message_t *message, u_int8_t ipcomp)
+{
+	if (this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY))
+	{
+		DBG1(DBG_IKE, "IPComp is not supported if either peer is natted, "
+			 "IPComp disabled");
+		return;
+	}
+
+	this->my_cpi = this->child_sa->alloc_cpi(this->child_sa);
+	if (this->my_cpi)
+	{
+		this->ipcomp = ipcomp;
+		message->add_notify(message, FALSE, IPCOMP_SUPPORTED,
+							chunk_cata("cc", chunk_from_thing(this->my_cpi),
+									   chunk_from_thing(ipcomp)));
+	}
+	else
+	{
+		DBG1(DBG_IKE, "unable to allocate a CPI from kernel, IPComp disabled");
+	}
+}
+
+/**
+ * handle a received notify payload
+ */
+static void handle_notify(private_child_create_t *this, notify_payload_t *notify)
+{
+	switch (notify->get_notify_type(notify))
+	{
+		case USE_TRANSPORT_MODE:
+			this->mode = MODE_TRANSPORT;
+			break;
+		case USE_BEET_MODE:
+			if (this->ike_sa->supports_extension(this->ike_sa, EXT_STRONGSWAN))
+			{	/* handle private use notify only if we know its meaning */
+				this->mode = MODE_BEET;
+			}
+			else
+			{
+				DBG1(DBG_IKE, "received a notify strongSwan uses for BEET "
+					 "mode, but peer implementation unknown, skipped");
+			}
+			break;
+		case IPCOMP_SUPPORTED:
+		{
+			ipcomp_transform_t ipcomp;
+			u_int16_t cpi;
+			chunk_t data;
+
+			data = notify->get_notification_data(notify);
+			cpi = *(u_int16_t*)data.ptr;
+			ipcomp = (ipcomp_transform_t)(*(data.ptr + 2));
+			switch (ipcomp)
+			{
+				case IPCOMP_DEFLATE:
+					this->other_cpi = cpi;
+					this->ipcomp_received = ipcomp;
+					break;
+				case IPCOMP_LZS:
+				case IPCOMP_LZJH:
+				default:
+					DBG1(DBG_IKE, "received IPCOMP_SUPPORTED notify with a "
+						 "transform ID we don't support %N",
+						 ipcomp_transform_names, ipcomp);
+					break;
+			}
+		}
+		default:
+			break;
+	}
+}
+
+/**
+ * Read payloads from message
+ */
+static void process_payloads(private_child_create_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	sa_payload_t *sa_payload;
+	ke_payload_t *ke_payload;
+	ts_payload_t *ts_payload;
+
+	/* defaults to TUNNEL mode */
+	this->mode = MODE_TUNNEL;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		switch (payload->get_type(payload))
+		{
+			case SECURITY_ASSOCIATION:
+				sa_payload = (sa_payload_t*)payload;
+				this->proposals = sa_payload->get_proposals(sa_payload);
+				break;
+			case KEY_EXCHANGE:
+				ke_payload = (ke_payload_t*)payload;
+				if (!this->initiator)
+				{
+					this->dh_group = ke_payload->get_dh_group_number(ke_payload);
+					this->dh = this->keymat->create_dh(this->keymat, this->dh_group);
+				}
+				if (this->dh)
+				{
+					this->dh->set_other_public_value(this->dh,
+								ke_payload->get_key_exchange_data(ke_payload));
+				}
+				break;
+			case TRAFFIC_SELECTOR_INITIATOR:
+				ts_payload = (ts_payload_t*)payload;
+				this->tsi = ts_payload->get_traffic_selectors(ts_payload);
+				break;
+			case TRAFFIC_SELECTOR_RESPONDER:
+				ts_payload = (ts_payload_t*)payload;
+				this->tsr = ts_payload->get_traffic_selectors(ts_payload);
+				break;
+			case NOTIFY:
+				handle_notify(this, (notify_payload_t*)payload);
+				break;
+			default:
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * Implementation of task_t.build for initiator
+ */
+static status_t build_i(private_child_create_t *this, message_t *message)
+{
+	host_t *me, *other, *vip;
+	peer_cfg_t *peer_cfg;
+
+	switch (message->get_exchange_type(message))
+	{
+		case IKE_SA_INIT:
+			return get_nonce(message, &this->my_nonce);
+		case CREATE_CHILD_SA:
+			if (generate_nonce(&this->my_nonce) != SUCCESS)
+			{
+				message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
+				return SUCCESS;
+			}
+			if (this->dh_group == MODP_NONE)
+			{
+				this->dh_group = this->config->get_dh_group(this->config);
+			}
+			break;
+		case IKE_AUTH:
+			if (message->get_message_id(message) != 1)
+			{
+				/* send only in the first request, not in subsequent rounds */
+				return NEED_MORE;
+			}
+			break;
+		default:
+			break;
+	}
+
+	if (this->reqid)
+	{
+		DBG0(DBG_IKE, "establishing CHILD_SA %s{%d}",
+			 this->config->get_name(this->config), this->reqid);
+	}
+	else
+	{
+		DBG0(DBG_IKE, "establishing CHILD_SA %s",
+			 this->config->get_name(this->config));
+	}
+
+	/* reuse virtual IP if we already have one */
+	me = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
+	if (me == NULL)
+	{
+		me = this->ike_sa->get_my_host(this->ike_sa);
+	}
+	other = this->ike_sa->get_virtual_ip(this->ike_sa, FALSE);
+	if (other == NULL)
+	{
+		other = this->ike_sa->get_other_host(this->ike_sa);
+	}
+
+	/* check if we want a virtual IP, but don't have one */
+	peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+	vip = peer_cfg->get_virtual_ip(peer_cfg);
+	if (!this->reqid && vip)
+	{
+		/* propose a 0.0.0.0/0 or ::/0 subnet when we use virtual ip */
+		vip = host_create_any(vip->get_family(vip));
+		this->tsi = this->config->get_traffic_selectors(this->config, TRUE,
+														NULL, vip);
+		vip->destroy(vip);
+	}
+	else
+	{	/* but narrow it for host2host / if we already have a vip */
+		this->tsi = this->config->get_traffic_selectors(this->config, TRUE,
+														NULL, me);
+	}
+	this->tsr = this->config->get_traffic_selectors(this->config, FALSE,
+													NULL, other);
+
+	if (this->packet_tsi)
+	{
+		this->tsi->insert_first(this->tsi,
+								this->packet_tsi->clone(this->packet_tsi));
+	}
+	if (this->packet_tsr)
+	{
+		this->tsr->insert_first(this->tsr,
+								this->packet_tsr->clone(this->packet_tsr));
+	}
+	this->proposals = this->config->get_proposals(this->config,
+												  this->dh_group == MODP_NONE);
+	this->mode = this->config->get_mode(this->config);
+	if (this->mode == MODE_TRANSPORT &&
+		this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY))
+	{
+		this->mode = MODE_TUNNEL;
+		DBG1(DBG_IKE, "not using transport mode, connection NATed");
+	}
+
+	this->child_sa = child_sa_create(this->ike_sa->get_my_host(this->ike_sa),
+			this->ike_sa->get_other_host(this->ike_sa), this->config, this->reqid,
+			this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY));
+
+	if (!allocate_spi(this))
+	{
+		DBG1(DBG_IKE, "unable to allocate SPIs from kernel");
+		return FAILED;
+	}
+
+	if (this->dh_group != MODP_NONE)
+	{
+		this->dh = this->keymat->create_dh(this->keymat, this->dh_group);
+	}
+
+	if (this->config->use_ipcomp(this->config))
+	{
+		/* IPCOMP_DEFLATE is the only transform we support at the moment */
+		add_ipcomp_notify(this, message, IPCOMP_DEFLATE);
+	}
+
+	build_payloads(this, message);
+
+	this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
+	this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
+	this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
+	this->tsi = NULL;
+	this->tsr = NULL;
+	this->proposals = NULL;
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_child_create_t *this, message_t *message)
+{
+	switch (message->get_exchange_type(message))
+	{
+		case IKE_SA_INIT:
+			return get_nonce(message, &this->other_nonce);
+		case CREATE_CHILD_SA:
+			get_nonce(message, &this->other_nonce);
+			break;
+		case IKE_AUTH:
+			if (message->get_message_id(message) != 1)
+			{
+				/* only handle first AUTH payload, not additional rounds */
+				return NEED_MORE;
+			}
+		default:
+			break;
+	}
+
+	process_payloads(this, message);
+
+	return NEED_MORE;
+}
+
+/**
+ * handle CHILD_SA setup failure
+ */
+static void handle_child_sa_failure(private_child_create_t *this,
+									message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_AUTH &&
+		lib->settings->get_bool(lib->settings,
+								"charon.close_ike_on_child_failure", FALSE))
+	{
+		/* we delay the delete for 100ms, as the IKE_AUTH response must arrive
+		 * first */
+		DBG1(DBG_IKE, "closing IKE_SA due CHILD_SA setup failure");
+		charon->scheduler->schedule_job_ms(charon->scheduler, (job_t*)
+			delete_ike_sa_job_create(this->ike_sa->get_id(this->ike_sa), TRUE),
+			100);
+	}
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_child_create_t *this, message_t *message)
+{
+	peer_cfg_t *peer_cfg;
+	payload_t *payload;
+	enumerator_t *enumerator;
+	bool no_dh = TRUE;
+
+	switch (message->get_exchange_type(message))
+	{
+		case IKE_SA_INIT:
+			return get_nonce(message, &this->my_nonce);
+		case CREATE_CHILD_SA:
+			if (generate_nonce(&this->my_nonce) != SUCCESS)
+			{
+				message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN,
+									chunk_empty);
+				return SUCCESS;
+			}
+			no_dh = FALSE;
+			break;
+		case IKE_AUTH:
+			if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
+			{	/* wait until all authentication round completed */
+				return NEED_MORE;
+			}
+		default:
+			break;
+	}
+
+	if (this->ike_sa->get_state(this->ike_sa) == IKE_REKEYING)
+	{
+		DBG1(DBG_IKE, "unable to create CHILD_SA while rekeying IKE_SA");
+		message->add_notify(message, TRUE, NO_ADDITIONAL_SAS, chunk_empty);
+		return SUCCESS;
+	}
+
+	peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+	if (peer_cfg && this->tsi && this->tsr)
+	{
+		host_t *me, *other;
+
+		me = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
+		if (me == NULL)
+		{
+			me = this->ike_sa->get_my_host(this->ike_sa);
+		}
+		other = this->ike_sa->get_virtual_ip(this->ike_sa, FALSE);
+		if (other == NULL)
+		{
+			other = this->ike_sa->get_other_host(this->ike_sa);
+		}
+		this->config = peer_cfg->select_child_cfg(peer_cfg, this->tsr,
+												  this->tsi, me, other);
+	}
+
+	if (this->config == NULL)
+	{
+		DBG1(DBG_IKE, "traffic selectors %#R=== %#R inacceptable",
+			 this->tsr, this->tsi);
+		message->add_notify(message, FALSE, TS_UNACCEPTABLE, chunk_empty);
+		handle_child_sa_failure(this, message);
+		return SUCCESS;
+	}
+
+	/* check if ike_config_t included non-critical error notifies */
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == NOTIFY)
+		{
+			notify_payload_t *notify = (notify_payload_t*)payload;
+
+			switch (notify->get_notify_type(notify))
+			{
+				case INTERNAL_ADDRESS_FAILURE:
+				case FAILED_CP_REQUIRED:
+				{
+					DBG1(DBG_IKE,"configuration payload negotation "
+						 "failed, no CHILD_SA built");
+					enumerator->destroy(enumerator);
+					handle_child_sa_failure(this, message);
+					return SUCCESS;
+				}
+				default:
+					break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	this->child_sa = child_sa_create(this->ike_sa->get_my_host(this->ike_sa),
+			this->ike_sa->get_other_host(this->ike_sa), this->config, this->reqid,
+			this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY));
+
+	if (this->ipcomp_received != IPCOMP_NONE)
+	{
+		if (this->config->use_ipcomp(this->config))
+		{
+			add_ipcomp_notify(this, message, this->ipcomp_received);
+		}
+		else
+		{
+			DBG1(DBG_IKE, "received %N notify but IPComp is disabled, ignoring",
+				 notify_type_names, IPCOMP_SUPPORTED);
+		}
+	}
+
+	switch (select_and_install(this, no_dh))
+	{
+		case SUCCESS:
+			break;
+		case NOT_FOUND:
+			message->add_notify(message, FALSE, TS_UNACCEPTABLE, chunk_empty);
+			handle_child_sa_failure(this, message);
+			return SUCCESS;
+		case INVALID_ARG:
+		{
+			u_int16_t group = htons(this->dh_group);
+			message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
+								chunk_from_thing(group));
+			handle_child_sa_failure(this, message);
+			return SUCCESS;
+		}
+		case FAILED:
+		default:
+			message->add_notify(message, FALSE, NO_PROPOSAL_CHOSEN, chunk_empty);
+			handle_child_sa_failure(this, message);
+			return SUCCESS;
+	}
+
+	build_payloads(this, message);
+
+	DBG0(DBG_IKE, "CHILD_SA %s{%d} established "
+		 "with SPIs %.8x_i %.8x_o and TS %#R=== %#R",
+		 this->child_sa->get_name(this->child_sa),
+		 this->child_sa->get_reqid(this->child_sa),
+		 ntohl(this->child_sa->get_spi(this->child_sa, TRUE)),
+		 ntohl(this->child_sa->get_spi(this->child_sa, FALSE)),
+		 this->child_sa->get_traffic_selectors(this->child_sa, TRUE),
+		 this->child_sa->get_traffic_selectors(this->child_sa, FALSE));
+
+	if (!this->rekey)
+	{	/* invoke the child_up() hook if we are not rekeying */
+		charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_child_create_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	bool no_dh = TRUE;
+
+	switch (message->get_exchange_type(message))
+	{
+		case IKE_SA_INIT:
+			return get_nonce(message, &this->other_nonce);
+		case CREATE_CHILD_SA:
+			get_nonce(message, &this->other_nonce);
+			no_dh = FALSE;
+			break;
+		case IKE_AUTH:
+			if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
+			{	/* wait until all authentication round completed */
+				return NEED_MORE;
+			}
+		default:
+			break;
+	}
+
+	/* check for erronous notifies */
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == NOTIFY)
+		{
+			notify_payload_t *notify = (notify_payload_t*)payload;
+			notify_type_t type = notify->get_notify_type(notify);
+
+			switch (type)
+			{
+				/* handle notify errors related to CHILD_SA only */
+				case NO_PROPOSAL_CHOSEN:
+				case SINGLE_PAIR_REQUIRED:
+				case NO_ADDITIONAL_SAS:
+				case INTERNAL_ADDRESS_FAILURE:
+				case FAILED_CP_REQUIRED:
+				case TS_UNACCEPTABLE:
+				case INVALID_SELECTORS:
+				{
+					DBG1(DBG_IKE, "received %N notify, no CHILD_SA built",
+						 notify_type_names, type);
+					enumerator->destroy(enumerator);
+					handle_child_sa_failure(this, message);
+					/* an error in CHILD_SA creation is not critical */
+					return SUCCESS;
+				}
+				case INVALID_KE_PAYLOAD:
+				{
+					chunk_t data;
+					u_int16_t group = MODP_NONE;
+
+					data = notify->get_notification_data(notify);
+					if (data.len == sizeof(group))
+					{
+						memcpy(&group, data.ptr, data.len);
+						group = ntohs(group);
+					}
+					DBG1(DBG_IKE, "peer didn't accept DH group %N, "
+						 "it requested %N", diffie_hellman_group_names,
+						 this->dh_group, diffie_hellman_group_names, group);
+					this->dh_group = group;
+					this->public.task.migrate(&this->public.task, this->ike_sa);
+					enumerator->destroy(enumerator);
+					return NEED_MORE;
+				}
+				default:
+					break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	process_payloads(this, message);
+
+	if (this->ipcomp == IPCOMP_NONE && this->ipcomp_received != IPCOMP_NONE)
+	{
+		DBG1(DBG_IKE, "received an IPCOMP_SUPPORTED notify without requesting"
+			 " one, no CHILD_SA built");
+		handle_child_sa_failure(this, message);
+		return SUCCESS;
+	}
+	else if (this->ipcomp != IPCOMP_NONE && this->ipcomp_received == IPCOMP_NONE)
+	{
+		DBG1(DBG_IKE, "peer didn't accept our proposed IPComp transforms, "
+			 "IPComp is disabled");
+		this->ipcomp = IPCOMP_NONE;
+	}
+	else if (this->ipcomp != IPCOMP_NONE && this->ipcomp != this->ipcomp_received)
+	{
+		DBG1(DBG_IKE, "received an IPCOMP_SUPPORTED notify we didn't propose, "
+			 "no CHILD_SA built");
+		handle_child_sa_failure(this, message);
+		return SUCCESS;
+	}
+
+	if (select_and_install(this, no_dh) == SUCCESS)
+	{
+		DBG0(DBG_IKE, "CHILD_SA %s{%d} established "
+			 "with SPIs %.8x_i %.8x_o and TS %#R=== %#R",
+			 this->child_sa->get_name(this->child_sa),
+			 this->child_sa->get_reqid(this->child_sa),
+			 ntohl(this->child_sa->get_spi(this->child_sa, TRUE)),
+			 ntohl(this->child_sa->get_spi(this->child_sa, FALSE)),
+			 this->child_sa->get_traffic_selectors(this->child_sa, TRUE),
+			 this->child_sa->get_traffic_selectors(this->child_sa, FALSE));
+
+		if (!this->rekey)
+		{	/* invoke the child_up() hook if we are not rekeying */
+			charon->bus->child_updown(charon->bus, this->child_sa, TRUE);
+		}
+	}
+	else
+	{
+		handle_child_sa_failure(this, message);
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_child_create_t *this)
+{
+	return CHILD_CREATE;
+}
+
+/**
+ * Implementation of child_create_t.use_reqid
+ */
+static void use_reqid(private_child_create_t *this, u_int32_t reqid)
+{
+	this->reqid = reqid;
+}
+
+/**
+ * Implementation of child_create_t.get_child
+ */
+static child_sa_t* get_child(private_child_create_t *this)
+{
+	return this->child_sa;
+}
+
+/**
+ * Implementation of child_create_t.get_lower_nonce
+ */
+static chunk_t get_lower_nonce(private_child_create_t *this)
+{
+	if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
+			   min(this->my_nonce.len, this->other_nonce.len)) < 0)
+	{
+		return this->my_nonce;
+	}
+	else
+	{
+		return this->other_nonce;
+	}
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_child_create_t *this, ike_sa_t *ike_sa)
+{
+	chunk_free(&this->my_nonce);
+	chunk_free(&this->other_nonce);
+	if (this->tsi)
+	{
+		this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
+	}
+	if (this->tsr)
+	{
+		this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
+	}
+	DESTROY_IF(this->child_sa);
+	DESTROY_IF(this->proposal);
+	DESTROY_IF(this->dh);
+	if (this->proposals)
+	{
+		this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
+	}
+
+	this->ike_sa = ike_sa;
+	this->keymat = ike_sa->get_keymat(ike_sa);
+	this->proposal = NULL;
+	this->proposals = NULL;
+	this->tsi = NULL;
+	this->tsr = NULL;
+	this->dh = NULL;
+	this->child_sa = NULL;
+	this->mode = MODE_TUNNEL;
+	this->ipcomp = IPCOMP_NONE;
+	this->ipcomp_received = IPCOMP_NONE;
+	this->other_cpi = 0;
+	this->reqid = 0;
+	this->established = FALSE;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_child_create_t *this)
+{
+	chunk_free(&this->my_nonce);
+	chunk_free(&this->other_nonce);
+	if (this->tsr)
+	{
+		this->tsr->destroy_offset(this->tsr, offsetof(traffic_selector_t, destroy));
+	}
+	if (this->tsi)
+	{
+		this->tsi->destroy_offset(this->tsi, offsetof(traffic_selector_t, destroy));
+	}
+	if (!this->established)
+	{
+		DESTROY_IF(this->child_sa);
+	}
+	DESTROY_IF(this->packet_tsi);
+	DESTROY_IF(this->packet_tsr);
+	DESTROY_IF(this->proposal);
+	DESTROY_IF(this->dh);
+	if (this->proposals)
+	{
+		this->proposals->destroy_offset(this->proposals, offsetof(proposal_t, destroy));
+	}
+
+	DESTROY_IF(this->config);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+child_create_t *child_create_create(ike_sa_t *ike_sa,
+							child_cfg_t *config, bool rekey,
+							traffic_selector_t *tsi, traffic_selector_t *tsr)
+{
+	private_child_create_t *this = malloc_thing(private_child_create_t);
+
+	this->public.get_child = (child_sa_t*(*)(child_create_t*))get_child;
+	this->public.get_lower_nonce = (chunk_t(*)(child_create_t*))get_lower_nonce;
+	this->public.use_reqid = (void(*)(child_create_t*,u_int32_t))use_reqid;
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+	if (config)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+		this->initiator = TRUE;
+		config->get_ref(config);
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+		this->initiator = FALSE;
+	}
+
+	this->ike_sa = ike_sa;
+	this->config = config;
+	this->my_nonce = chunk_empty;
+	this->other_nonce = chunk_empty;
+	this->proposals = NULL;
+	this->proposal = NULL;
+	this->tsi = NULL;
+	this->tsr = NULL;
+	this->packet_tsi = tsi ? tsi->clone(tsi) : NULL;
+	this->packet_tsr = tsr ? tsr->clone(tsr) : NULL;
+	this->dh = NULL;
+	this->dh_group = MODP_NONE;
+	this->keymat = ike_sa->get_keymat(ike_sa);
+	this->child_sa = NULL;
+	this->mode = MODE_TUNNEL;
+	this->ipcomp = IPCOMP_NONE;
+	this->ipcomp_received = IPCOMP_NONE;
+	this->my_spi = 0;
+	this->other_spi = 0;
+	this->my_cpi = 0;
+	this->other_cpi = 0;
+	this->reqid = 0;
+	this->established = FALSE;
+	this->rekey = rekey;
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/child_create.h b/src/libcharon/sa/tasks/child_create.h
new file mode 100644
index 000000000..5dedeb8b1
--- /dev/null
+++ b/src/libcharon/sa/tasks/child_create.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup child_create child_create
+ * @{ @ingroup tasks
+ */
+
+#ifndef CHILD_CREATE_H_
+#define CHILD_CREATE_H_
+
+typedef struct child_create_t child_create_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+#include <config/child_cfg.h>
+
+/**
+ * Task of type CHILD_CREATE, established a new CHILD_SA.
+ *
+ * This task may be included in the IKE_AUTH message or in a separate
+ * CREATE_CHILD_SA exchange.
+ */
+struct child_create_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+
+	/**
+	 * Use a specific reqid for the CHILD_SA.
+	 *
+	 * When this task is used for rekeying, the same reqid is used
+	 * for the new CHILD_SA.
+	 *
+	 * @param reqid		reqid to use
+	 */
+	void (*use_reqid) (child_create_t *this, u_int32_t reqid);
+
+	/**
+	 * Get the lower of the two nonces, used for rekey collisions.
+	 *
+	 * @return			lower nonce
+	 */
+	chunk_t (*get_lower_nonce) (child_create_t *this);
+
+	/**
+	 * Get the CHILD_SA established/establishing by this task.
+	 *
+	 * @return			child_sa
+	 */
+	child_sa_t* (*get_child) (child_create_t *this);
+};
+
+/**
+ * Create a new child_create task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param config		child_cfg if task initiator, NULL if responder
+ * @param rekey			whether we do a rekey or not
+ * @param tsi			source of triggering packet, or NULL
+ * @param tsr			destination of triggering packet, or NULL
+ * @return				child_create task to handle by the task_manager
+ */
+child_create_t *child_create_create(ike_sa_t *ike_sa,
+							child_cfg_t *config, bool rekey,
+							traffic_selector_t *tsi, traffic_selector_t *tsr);
+
+#endif /** CHILD_CREATE_H_ @}*/
diff --git a/src/libcharon/sa/tasks/child_delete.c b/src/libcharon/sa/tasks/child_delete.c
new file mode 100644
index 000000000..d7c6b0541
--- /dev/null
+++ b/src/libcharon/sa/tasks/child_delete.c
@@ -0,0 +1,402 @@
+/*
+ * Copyright (C) 2006-2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "child_delete.h"
+
+#include <daemon.h>
+#include <encoding/payloads/delete_payload.h>
+
+
+typedef struct private_child_delete_t private_child_delete_t;
+
+/**
+ * Private members of a child_delete_t task.
+ */
+struct private_child_delete_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	child_delete_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * Protocol of CHILD_SA to delete
+	 */
+	protocol_id_t protocol;
+
+	/**
+	 * Inbound SPI of CHILD_SA to delete
+	 */
+	u_int32_t spi;
+
+	/**
+	 * whether to enforce delete action policy
+	 */
+	bool check_delete_action;
+
+	/**
+	 * is this delete exchange following a rekey?
+	 */
+	bool rekeyed;
+
+	/**
+	 * CHILD_SAs which get deleted
+	 */
+	linked_list_t *child_sas;
+};
+
+/**
+ * build the delete payloads from the listed child_sas
+ */
+static void build_payloads(private_child_delete_t *this, message_t *message)
+{
+	delete_payload_t *ah = NULL, *esp = NULL;
+	iterator_t *iterator;
+	child_sa_t *child_sa;
+
+	iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
+	while (iterator->iterate(iterator, (void**)&child_sa))
+	{
+		protocol_id_t protocol = child_sa->get_protocol(child_sa);
+		u_int32_t spi = child_sa->get_spi(child_sa, TRUE);
+
+		switch (protocol)
+		{
+			case PROTO_ESP:
+				if (esp == NULL)
+				{
+					esp = delete_payload_create(PROTO_ESP);
+					message->add_payload(message, (payload_t*)esp);
+				}
+				esp->add_spi(esp, spi);
+				DBG1(DBG_IKE, "sending DELETE for %N CHILD_SA with SPI %.8x",
+							   protocol_id_names, protocol, ntohl(spi));
+				break;
+			case PROTO_AH:
+				if (ah == NULL)
+				{
+					ah = delete_payload_create(PROTO_AH);
+					message->add_payload(message, (payload_t*)ah);
+				}
+				ah->add_spi(ah, spi);
+				DBG1(DBG_IKE, "sending DELETE for %N CHILD_SA with SPI %.8x",
+							   protocol_id_names, protocol, ntohl(spi));
+				break;
+			default:
+				break;
+		}
+		child_sa->set_state(child_sa, CHILD_DELETING);
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * read in payloads and find the children to delete
+ */
+static void process_payloads(private_child_delete_t *this, message_t *message)
+{
+	enumerator_t *payloads;
+	iterator_t *spis;
+	payload_t *payload;
+	delete_payload_t *delete_payload;
+	u_int32_t *spi;
+	protocol_id_t protocol;
+	child_sa_t *child_sa;
+
+	payloads = message->create_payload_enumerator(message);
+	while (payloads->enumerate(payloads, &payload))
+	{
+		if (payload->get_type(payload) == DELETE)
+		{
+			delete_payload = (delete_payload_t*)payload;
+			protocol = delete_payload->get_protocol_id(delete_payload);
+			if (protocol != PROTO_ESP && protocol != PROTO_AH)
+			{
+				continue;
+			}
+			spis = delete_payload->create_spi_iterator(delete_payload);
+			while (spis->iterate(spis, (void**)&spi))
+			{
+				child_sa = this->ike_sa->get_child_sa(this->ike_sa, protocol,
+													  *spi, FALSE);
+				if (child_sa == NULL)
+				{
+					DBG1(DBG_IKE, "received DELETE for %N CHILD_SA with SPI %.8x, "
+						 "but no such SA", protocol_id_names, protocol, ntohl(*spi));
+					continue;
+				}
+				DBG1(DBG_IKE, "received DELETE for %N CHILD_SA with SPI %.8x",
+						protocol_id_names, protocol, ntohl(*spi));
+
+				switch (child_sa->get_state(child_sa))
+				{
+					case CHILD_REKEYING:
+						this->rekeyed = TRUE;
+						/* we reply as usual, rekeying will fail */
+						break;
+					case CHILD_DELETING:
+						/* we don't send back a delete if we initiated ourself */
+						if (!this->initiator)
+						{
+							this->ike_sa->destroy_child_sa(this->ike_sa,
+														   protocol, *spi);
+							continue;
+						}
+					case CHILD_INSTALLED:
+						if (!this->initiator)
+						{	/* reestablish installed children if required */
+							this->check_delete_action = TRUE;
+						}
+					default:
+						break;
+				}
+
+				this->child_sas->insert_last(this->child_sas, child_sa);
+			}
+			spis->destroy(spis);
+		}
+	}
+	payloads->destroy(payloads);
+}
+
+/**
+ * destroy the children listed in this->child_sas, reestablish by policy
+ */
+static status_t destroy_and_reestablish(private_child_delete_t *this)
+{
+	iterator_t *iterator;
+	child_sa_t *child_sa;
+	child_cfg_t *child_cfg;
+	protocol_id_t protocol;
+	u_int32_t spi;
+	status_t status = SUCCESS;
+
+	iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
+	while (iterator->iterate(iterator, (void**)&child_sa))
+	{
+		/* signal child down event if we are not rekeying */
+		if (!this->rekeyed)
+		{
+			charon->bus->child_updown(charon->bus, child_sa, FALSE);
+		}
+		spi = child_sa->get_spi(child_sa, TRUE);
+		protocol = child_sa->get_protocol(child_sa);
+		child_cfg = child_sa->get_config(child_sa);
+		child_cfg->get_ref(child_cfg);
+		this->ike_sa->destroy_child_sa(this->ike_sa, protocol, spi);
+		if (this->check_delete_action)
+		{	/* enforce child_cfg policy if deleted passively */
+			switch (child_cfg->get_close_action(child_cfg))
+			{
+				case ACTION_RESTART:
+					child_cfg->get_ref(child_cfg);
+					status = this->ike_sa->initiate(this->ike_sa, child_cfg, 0,
+													NULL, NULL);
+					break;
+				case ACTION_ROUTE:
+					charon->traps->install(charon->traps,
+							this->ike_sa->get_peer_cfg(this->ike_sa), child_cfg);
+					break;
+				default:
+					break;
+			}
+		}
+		child_cfg->destroy(child_cfg);
+		if (status != SUCCESS)
+		{
+			break;
+		}
+	}
+	iterator->destroy(iterator);
+	return status;
+}
+
+/**
+ * send closing signals for all CHILD_SAs over the bus
+ */
+static void log_children(private_child_delete_t *this)
+{
+	iterator_t *iterator;
+	child_sa_t *child_sa;
+	u_int64_t bytes_in, bytes_out;
+
+	iterator = this->child_sas->create_iterator(this->child_sas, TRUE);
+	while (iterator->iterate(iterator, (void**)&child_sa))
+	{
+		child_sa->get_usestats(child_sa, TRUE, NULL, &bytes_in);
+		child_sa->get_usestats(child_sa, FALSE, NULL, &bytes_out);
+
+		DBG0(DBG_IKE, "closing CHILD_SA %s{%d} "
+			 "with SPIs %.8x_i (%llu bytes) %.8x_o (%llu bytes) and TS %#R=== %#R",
+			 child_sa->get_name(child_sa), child_sa->get_reqid(child_sa),
+			 ntohl(child_sa->get_spi(child_sa, TRUE)), bytes_in,
+			 ntohl(child_sa->get_spi(child_sa, FALSE)), bytes_out,
+			 child_sa->get_traffic_selectors(child_sa, TRUE),
+			 child_sa->get_traffic_selectors(child_sa, FALSE));
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Implementation of task_t.build for initiator
+ */
+static status_t build_i(private_child_delete_t *this, message_t *message)
+{
+	child_sa_t *child_sa;
+
+	child_sa = this->ike_sa->get_child_sa(this->ike_sa, this->protocol,
+										  this->spi, TRUE);
+	if (!child_sa)
+	{	/* check if it is an outbound sa */
+		child_sa = this->ike_sa->get_child_sa(this->ike_sa, this->protocol,
+											  this->spi, FALSE);
+		if (!child_sa)
+		{	/* child does not exist anymore */
+			return SUCCESS;
+		}
+		/* we work only with the inbound SPI */
+		this->spi = child_sa->get_spi(child_sa, TRUE);
+	}
+	this->child_sas->insert_last(this->child_sas, child_sa);
+	if (child_sa->get_state(child_sa) == CHILD_REKEYING)
+	{
+		this->rekeyed = TRUE;
+	}
+	log_children(this);
+	build_payloads(this, message);
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_child_delete_t *this, message_t *message)
+{
+	/* flush the list before adding new SAs */
+	this->child_sas->destroy(this->child_sas);
+	this->child_sas = linked_list_create();
+
+	process_payloads(this, message);
+	DBG1(DBG_IKE, "CHILD_SA closed");
+	return destroy_and_reestablish(this);
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_r(private_child_delete_t *this, message_t *message)
+{
+	process_payloads(this, message);
+	log_children(this);
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_child_delete_t *this, message_t *message)
+{
+	/* if we are rekeying, we send an empty informational */
+	if (this->ike_sa->get_state(this->ike_sa) != IKE_REKEYING)
+	{
+		build_payloads(this, message);
+	}
+	DBG1(DBG_IKE, "CHILD_SA closed");
+	return destroy_and_reestablish(this);
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_child_delete_t *this)
+{
+	return CHILD_DELETE;
+}
+
+/**
+ * Implementation of child_delete_t.get_child
+ */
+static child_sa_t* get_child(private_child_delete_t *this)
+{
+	child_sa_t *child_sa = NULL;
+	this->child_sas->get_first(this->child_sas, (void**)&child_sa);
+	return child_sa;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_child_delete_t *this, ike_sa_t *ike_sa)
+{
+	this->check_delete_action = FALSE;
+	this->ike_sa = ike_sa;
+
+	this->child_sas->destroy(this->child_sas);
+	this->child_sas = linked_list_create();
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_child_delete_t *this)
+{
+	this->child_sas->destroy(this->child_sas);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+child_delete_t *child_delete_create(ike_sa_t *ike_sa, protocol_id_t protocol,
+									u_int32_t spi)
+{
+	private_child_delete_t *this = malloc_thing(private_child_delete_t);
+
+	this->public.get_child = (child_sa_t*(*)(child_delete_t*))get_child;
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	this->ike_sa = ike_sa;
+	this->check_delete_action = FALSE;
+	this->child_sas = linked_list_create();
+	this->protocol = protocol;
+	this->spi = spi;
+	this->rekeyed = FALSE;
+
+	if (protocol != PROTO_NONE)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+		this->initiator = TRUE;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+		this->initiator = FALSE;
+	}
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/child_delete.h b/src/libcharon/sa/tasks/child_delete.h
new file mode 100644
index 000000000..365807c68
--- /dev/null
+++ b/src/libcharon/sa/tasks/child_delete.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup child_delete child_delete
+ * @{ @ingroup tasks
+ */
+
+#ifndef CHILD_DELETE_H_
+#define CHILD_DELETE_H_
+
+typedef struct child_delete_t child_delete_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+#include <sa/child_sa.h>
+
+/**
+ * Task of type child_delete, delete a CHILD_SA.
+ */
+struct child_delete_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+
+	/**
+	 * Get the CHILD_SA to delete by this task.
+	 *
+	 * @return			child_sa
+	 */
+	child_sa_t* (*get_child) (child_delete_t *this);
+};
+
+/**
+ * Create a new child_delete task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param protocol		protocol of CHILD_SA to delete, PROTO_NONE as responder
+ * @param spi			inbound SPI of CHILD_SA to delete
+ * @return				child_delete task to handle by the task_manager
+ */
+child_delete_t *child_delete_create(ike_sa_t *ike_sa, protocol_id_t protocol,
+									u_int32_t spi);
+
+#endif /** CHILD_DELETE_H_ @}*/
diff --git a/src/libcharon/sa/tasks/child_rekey.c b/src/libcharon/sa/tasks/child_rekey.c
new file mode 100644
index 000000000..b5e4e84b4
--- /dev/null
+++ b/src/libcharon/sa/tasks/child_rekey.c
@@ -0,0 +1,430 @@
+/*
+ * Copyright (C) 2005-2007 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "child_rekey.h"
+
+#include <daemon.h>
+#include <encoding/payloads/notify_payload.h>
+#include <sa/tasks/child_create.h>
+#include <sa/tasks/child_delete.h>
+#include <processing/jobs/rekey_child_sa_job.h>
+#include <processing/jobs/rekey_ike_sa_job.h>
+
+
+typedef struct private_child_rekey_t private_child_rekey_t;
+
+/**
+ * Private members of a child_rekey_t task.
+ */
+struct private_child_rekey_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	child_rekey_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * Protocol of CHILD_SA to rekey
+	 */
+	protocol_id_t protocol;
+
+	/**
+	 * Inbound SPI of CHILD_SA to rekey
+	 */
+	u_int32_t spi;
+
+	/**
+	 * the CHILD_CREATE task which is reused to simplify rekeying
+	 */
+	child_create_t *child_create;
+
+	/**
+	 * the CHILD_DELETE task to delete rekeyed CHILD_SA
+	 */
+	child_delete_t *child_delete;
+
+	/**
+	 * CHILD_SA which gets rekeyed
+	 */
+	child_sa_t *child_sa;
+
+	/**
+	 * colliding task, may be delete or rekey
+	 */
+	task_t *collision;
+};
+
+/**
+ * Implementation of task_t.build for initiator, after rekeying
+ */
+static status_t build_i_delete(private_child_rekey_t *this, message_t *message)
+{
+	/* update exchange type to INFORMATIONAL for the delete */
+	message->set_exchange_type(message, INFORMATIONAL);
+
+	return this->child_delete->task.build(&this->child_delete->task, message);
+}
+
+/**
+ * Implementation of task_t.process for initiator, after rekeying
+ */
+static status_t process_i_delete(private_child_rekey_t *this, message_t *message)
+{
+	return this->child_delete->task.process(&this->child_delete->task, message);
+}
+
+/**
+ * find a child using the REKEY_SA notify
+ */
+static void find_child(private_child_rekey_t *this, message_t *message)
+{
+	notify_payload_t *notify;
+	protocol_id_t protocol;
+	u_int32_t spi;
+
+	notify = message->get_notify(message, REKEY_SA);
+	if (notify)
+	{
+		protocol = notify->get_protocol_id(notify);
+		spi = notify->get_spi(notify);
+
+		if (protocol == PROTO_ESP || protocol == PROTO_AH)
+		{
+			this->child_sa = this->ike_sa->get_child_sa(this->ike_sa, protocol,
+														spi, FALSE);
+		}
+	}
+}
+
+/**
+ * Implementation of task_t.build for initiator
+ */
+static status_t build_i(private_child_rekey_t *this, message_t *message)
+{
+	notify_payload_t *notify;
+	u_int32_t reqid;
+	child_cfg_t *config;
+
+	this->child_sa = this->ike_sa->get_child_sa(this->ike_sa, this->protocol,
+												this->spi, TRUE);
+	if (!this->child_sa)
+	{	/* check if it is an outbound CHILD_SA */
+		this->child_sa = this->ike_sa->get_child_sa(this->ike_sa, this->protocol,
+													this->spi, FALSE);
+		if (!this->child_sa)
+		{	/* CHILD_SA is gone, unable to rekey. As an empty CREATE_CHILD_SA
+			 * exchange is invalid, we fall back to an INFORMATIONAL exchange.*/
+			message->set_exchange_type(message, INFORMATIONAL);
+			return SUCCESS;
+		}
+		/* we work only with the inbound SPI */
+		this->spi = this->child_sa->get_spi(this->child_sa, TRUE);
+	}
+	config = this->child_sa->get_config(this->child_sa);
+
+	/* we just need the rekey notify ... */
+	notify = notify_payload_create_from_protocol_and_type(this->protocol,
+														  REKEY_SA);
+	notify->set_spi(notify, this->spi);
+	message->add_payload(message, (payload_t*)notify);
+
+	/* ... our CHILD_CREATE task does the hard work for us. */
+	if (!this->child_create)
+	{
+		this->child_create = child_create_create(this->ike_sa, config, TRUE,
+												 NULL, NULL);
+	}
+	reqid = this->child_sa->get_reqid(this->child_sa);
+	this->child_create->use_reqid(this->child_create, reqid);
+	this->child_create->task.build(&this->child_create->task, message);
+
+	this->child_sa->set_state(this->child_sa, CHILD_REKEYING);
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_r(private_child_rekey_t *this, message_t *message)
+{
+	/* let the CHILD_CREATE task process the message */
+	this->child_create->task.process(&this->child_create->task, message);
+
+	find_child(this, message);
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_child_rekey_t *this, message_t *message)
+{
+	u_int32_t reqid;
+
+	if (this->child_sa == NULL ||
+		this->child_sa->get_state(this->child_sa) == CHILD_DELETING)
+	{
+		DBG1(DBG_IKE, "unable to rekey, CHILD_SA not found");
+		message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
+		return SUCCESS;
+	}
+
+	/* let the CHILD_CREATE task build the response */
+	reqid = this->child_sa->get_reqid(this->child_sa);
+	this->child_create->use_reqid(this->child_create, reqid);
+	this->child_create->task.build(&this->child_create->task, message);
+
+	if (message->get_payload(message, SECURITY_ASSOCIATION) == NULL)
+	{
+		/* rekeying failed, reuse old child */
+		this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
+		return SUCCESS;
+	}
+
+	this->child_sa->set_state(this->child_sa, CHILD_REKEYING);
+
+	/* invoke rekey hook */
+	charon->bus->child_rekey(charon->bus, this->child_sa,
+							 this->child_create->get_child(this->child_create));
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_child_rekey_t *this, message_t *message)
+{
+	protocol_id_t protocol;
+	u_int32_t spi;
+	child_sa_t *to_delete;
+
+	if (message->get_notify(message, NO_ADDITIONAL_SAS))
+	{
+		DBG1(DBG_IKE, "peer seems to not support CHILD_SA rekeying, "
+			 "starting reauthentication");
+		this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
+		charon->processor->queue_job(charon->processor,
+				(job_t*)rekey_ike_sa_job_create(
+							this->ike_sa->get_id(this->ike_sa), TRUE));
+		return SUCCESS;
+	}
+
+	if (this->child_create->task.process(&this->child_create->task,
+										 message) == NEED_MORE)
+	{
+		/* bad DH group while rekeying, try again */
+		this->child_create->task.migrate(&this->child_create->task, this->ike_sa);
+		return NEED_MORE;
+	}
+	if (message->get_payload(message, SECURITY_ASSOCIATION) == NULL)
+	{
+		/* establishing new child failed, reuse old. but not when we
+		 * recieved a delete in the meantime */
+		if (!(this->collision &&
+			  this->collision->get_type(this->collision) == CHILD_DELETE))
+		{
+			job_t *job;
+			u_int32_t retry = RETRY_INTERVAL - (random() % RETRY_JITTER);
+
+			job = (job_t*)rekey_child_sa_job_create(
+								this->child_sa->get_reqid(this->child_sa),
+								this->child_sa->get_protocol(this->child_sa),
+								this->child_sa->get_spi(this->child_sa, TRUE));
+			DBG1(DBG_IKE, "CHILD_SA rekeying failed, "
+								"trying again in %d seconds", retry);
+			this->child_sa->set_state(this->child_sa, CHILD_INSTALLED);
+			charon->scheduler->schedule_job(charon->scheduler, job, retry);
+		}
+		return SUCCESS;
+	}
+
+	to_delete = this->child_sa;
+
+	/* check for rekey collisions */
+	if (this->collision &&
+		this->collision->get_type(this->collision) == CHILD_REKEY)
+	{
+		chunk_t this_nonce, other_nonce;
+		private_child_rekey_t *other = (private_child_rekey_t*)this->collision;
+
+		this_nonce = this->child_create->get_lower_nonce(this->child_create);
+		other_nonce = other->child_create->get_lower_nonce(other->child_create);
+
+		/* if we have the lower nonce, delete rekeyed SA. If not, delete
+		 * the redundant. */
+		if (memcmp(this_nonce.ptr, other_nonce.ptr,
+				   min(this_nonce.len, other_nonce.len)) < 0)
+		{
+			DBG1(DBG_IKE, "CHILD_SA rekey collision won, deleting rekeyed child");
+		}
+		else
+		{
+			DBG1(DBG_IKE, "CHILD_SA rekey collision lost, deleting redundant child");
+			to_delete = this->child_create->get_child(this->child_create);
+			if (to_delete == NULL)
+			{
+				/* ooops, should not happen, fallback */
+				to_delete = this->child_sa;
+			}
+		}
+	}
+
+	if (to_delete != this->child_create->get_child(this->child_create))
+	{	/* invoke rekey hook if rekeying successful */
+		charon->bus->child_rekey(charon->bus, this->child_sa,
+							this->child_create->get_child(this->child_create));
+	}
+
+	spi = to_delete->get_spi(to_delete, TRUE);
+	protocol = to_delete->get_protocol(to_delete);
+
+	/* rekeying done, delete the obsolete CHILD_SA using a subtask */
+	this->child_delete = child_delete_create(this->ike_sa, protocol, spi);
+	this->public.task.build = (status_t(*)(task_t*,message_t*))build_i_delete;
+	this->public.task.process = (status_t(*)(task_t*,message_t*))process_i_delete;
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_child_rekey_t *this)
+{
+	return CHILD_REKEY;
+}
+
+/**
+ * Implementation of child_rekey_t.collide
+ */
+static void collide(private_child_rekey_t *this, task_t *other)
+{
+	/* the task manager only detects exchange collision, but not if
+	 * the collision is for the same child. we check it here. */
+	if (other->get_type(other) == CHILD_REKEY)
+	{
+		private_child_rekey_t *rekey = (private_child_rekey_t*)other;
+		if (rekey == NULL || rekey->child_sa != this->child_sa)
+		{
+			/* not the same child => no collision */
+			other->destroy(other);
+			return;
+		}
+	}
+	else if (other->get_type(other) == CHILD_DELETE)
+	{
+		child_delete_t *del = (child_delete_t*)other;
+		if (del == NULL || del->get_child(del) != this->child_sa)
+		{
+			/* not the same child => no collision */
+			other->destroy(other);
+			return;
+		}
+	}
+	else
+	{
+		/* any other task is not critical for collisisions, ignore */
+		other->destroy(other);
+		return;
+	}
+	DESTROY_IF(this->collision);
+	this->collision = other;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_child_rekey_t *this, ike_sa_t *ike_sa)
+{
+	if (this->child_create)
+	{
+		this->child_create->task.migrate(&this->child_create->task, ike_sa);
+	}
+	if (this->child_delete)
+	{
+		this->child_delete->task.migrate(&this->child_delete->task, ike_sa);
+	}
+	DESTROY_IF(this->collision);
+
+	this->ike_sa = ike_sa;
+	this->collision = NULL;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_child_rekey_t *this)
+{
+	if (this->child_create)
+	{
+		this->child_create->task.destroy(&this->child_create->task);
+	}
+	if (this->child_delete)
+	{
+		this->child_delete->task.destroy(&this->child_delete->task);
+	}
+	DESTROY_IF(this->collision);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+child_rekey_t *child_rekey_create(ike_sa_t *ike_sa, protocol_id_t protocol,
+								  u_int32_t spi)
+{
+	private_child_rekey_t *this = malloc_thing(private_child_rekey_t);
+
+	this->public.collide = (void (*)(child_rekey_t*,task_t*))collide;
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+	if (protocol != PROTO_NONE)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+		this->initiator = TRUE;
+		this->child_create = NULL;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+		this->initiator = FALSE;
+		this->child_create = child_create_create(ike_sa, NULL, TRUE, NULL, NULL);
+	}
+
+	this->ike_sa = ike_sa;
+	this->child_sa = NULL;
+	this->protocol = protocol;
+	this->spi = spi;
+	this->collision = NULL;
+	this->child_delete = NULL;
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/child_rekey.h b/src/libcharon/sa/tasks/child_rekey.h
new file mode 100644
index 000000000..9b1aea5fa
--- /dev/null
+++ b/src/libcharon/sa/tasks/child_rekey.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup child_rekey child_rekey
+ * @{ @ingroup tasks
+ */
+
+#ifndef CHILD_REKEY_H_
+#define CHILD_REKEY_H_
+
+typedef struct child_rekey_t child_rekey_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/child_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type CHILD_REKEY, rekey an established CHILD_SA.
+ */
+struct child_rekey_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+
+	/**
+	 * Register a rekeying task which collides with this one
+	 *
+	 * If two peers initiate rekeying at the same time, the collision must
+	 * be handled gracefully. The task manager is aware of what exchanges
+	 * are going on and notifies the outgoing task by passing the incoming.
+	 *
+	 * @param other		incoming task
+	 */
+	void (*collide)(child_rekey_t* this, task_t *other);
+};
+
+/**
+ * Create a new CHILD_REKEY task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param protocol		protocol of CHILD_SA to rekey, PROTO_NONE as responder
+ * @param spi			inbound SPI of CHILD_SA to rekey
+ * @return				child_rekey task to handle by the task_manager
+ */
+child_rekey_t *child_rekey_create(ike_sa_t *ike_sa, protocol_id_t protocol,
+								  u_int32_t spi);
+
+#endif /** CHILD_REKEY_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_auth.c b/src/libcharon/sa/tasks/ike_auth.c
new file mode 100644
index 000000000..a07f96767
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_auth.c
@@ -0,0 +1,1041 @@
+/*
+ * Copyright (C) 2005-2009 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details
+ */
+
+#include "ike_auth.h"
+
+#include <string.h>
+
+#include <daemon.h>
+#include <encoding/payloads/id_payload.h>
+#include <encoding/payloads/auth_payload.h>
+#include <encoding/payloads/eap_payload.h>
+#include <encoding/payloads/nonce_payload.h>
+#include <sa/authenticators/eap_authenticator.h>
+
+typedef struct private_ike_auth_t private_ike_auth_t;
+
+/**
+ * Private members of a ike_auth_t task.
+ */
+struct private_ike_auth_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_auth_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * Nonce chosen by us in ike_init
+	 */
+	chunk_t my_nonce;
+
+	/**
+	 * Nonce chosen by peer in ike_init
+	 */
+	chunk_t other_nonce;
+
+	/**
+	 * IKE_SA_INIT message sent by us
+	 */
+	packet_t *my_packet;
+
+	/**
+	 * IKE_SA_INIT message sent by peer
+	 */
+	packet_t *other_packet;
+
+	/**
+	 * currently active authenticator, to authenticate us
+	 */
+	authenticator_t *my_auth;
+
+	/**
+	 * currently active authenticator, to authenticate peer
+	 */
+	authenticator_t *other_auth;
+
+	/**
+	 * peer_cfg candidates, ordered by priority
+	 */
+	linked_list_t *candidates;
+
+	/**
+	 * selected peer config (might change when using multiple authentications)
+	 */
+	peer_cfg_t *peer_cfg;
+
+	/**
+	 * have we planned an(other) authentication exchange?
+	 */
+	bool do_another_auth;
+
+	/**
+	 * has the peer announced another authentication exchange?
+	 */
+	bool expect_another_auth;
+
+	/**
+	 * should we send a AUTHENTICATION_FAILED notify?
+	 */
+	bool authentication_failed;
+};
+
+/**
+ * check if multiple authentication extension is enabled, configuration-wise
+ */
+static bool multiple_auth_enabled()
+{
+	return lib->settings->get_bool(lib->settings,
+								   "charon.multiple_authentication", TRUE);
+}
+
+/**
+ * collect the needed information in the IKE_SA_INIT exchange from our message
+ */
+static status_t collect_my_init_data(private_ike_auth_t *this,
+									 message_t *message)
+{
+	nonce_payload_t *nonce;
+
+	/* get the nonce that was generated in ike_init */
+	nonce = (nonce_payload_t*)message->get_payload(message, NONCE);
+	if (nonce == NULL)
+	{
+		return FAILED;
+	}
+	this->my_nonce = nonce->get_nonce(nonce);
+
+	/* pre-generate the message, keep a copy */
+	if (this->ike_sa->generate_message(this->ike_sa, message,
+									   &this->my_packet) != SUCCESS)
+	{
+		return FAILED;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * collect the needed information in the IKE_SA_INIT exchange from others message
+ */
+static status_t collect_other_init_data(private_ike_auth_t *this,
+										message_t *message)
+{
+	/* we collect the needed information in the IKE_SA_INIT exchange */
+	nonce_payload_t *nonce;
+
+	/* get the nonce that was generated in ike_init */
+	nonce = (nonce_payload_t*)message->get_payload(message, NONCE);
+	if (nonce == NULL)
+	{
+		return FAILED;
+	}
+	this->other_nonce = nonce->get_nonce(nonce);
+
+	/* keep a copy of the received packet */
+	this->other_packet = message->get_packet(message);
+	return NEED_MORE;
+}
+
+/**
+ * Get the next authentication configuration
+ */
+static auth_cfg_t *get_auth_cfg(private_ike_auth_t *this, bool local)
+{
+	enumerator_t *e1, *e2;
+	auth_cfg_t *c1, *c2, *next = NULL;
+
+	/* find an available config not already done */
+	e1 = this->peer_cfg->create_auth_cfg_enumerator(this->peer_cfg, local);
+	while (e1->enumerate(e1, &c1))
+	{
+		bool found = FALSE;
+
+		e2 = this->ike_sa->create_auth_cfg_enumerator(this->ike_sa, local);
+		while (e2->enumerate(e2, &c2))
+		{
+			if (c2->complies(c2, c1, FALSE))
+			{
+				found = TRUE;
+				break;
+			}
+		}
+		e2->destroy(e2);
+		if (!found)
+		{
+			next = c1;
+			break;
+		}
+	}
+	e1->destroy(e1);
+	return next;
+}
+
+/**
+ * Check if we have should initiate another authentication round
+ */
+static bool do_another_auth(private_ike_auth_t *this)
+{
+	bool do_another = FALSE;
+	enumerator_t *done, *todo;
+	auth_cfg_t *done_cfg, *todo_cfg;
+
+	if (!this->ike_sa->supports_extension(this->ike_sa, EXT_MULTIPLE_AUTH))
+	{
+		return FALSE;
+	}
+
+	done = this->ike_sa->create_auth_cfg_enumerator(this->ike_sa, TRUE);
+	todo = this->peer_cfg->create_auth_cfg_enumerator(this->peer_cfg, TRUE);
+	while (todo->enumerate(todo, &todo_cfg))
+	{
+		if (!done->enumerate(done, &done_cfg))
+		{
+			done_cfg = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+		}
+		if (!done_cfg->complies(done_cfg, todo_cfg, FALSE))
+		{
+			do_another = TRUE;
+			break;
+		}
+	}
+	done->destroy(done);
+	todo->destroy(todo);
+	return do_another;
+}
+
+/**
+ * Get peer configuration candidates from backends
+ */
+static bool load_cfg_candidates(private_ike_auth_t *this)
+{
+	enumerator_t *enumerator;
+	peer_cfg_t *peer_cfg;
+	host_t *me, *other;
+	identification_t *my_id, *other_id;
+
+	me = this->ike_sa->get_my_host(this->ike_sa);
+	other = this->ike_sa->get_other_host(this->ike_sa);
+	my_id = this->ike_sa->get_my_id(this->ike_sa);
+	other_id = this->ike_sa->get_other_id(this->ike_sa);
+
+	enumerator = charon->backends->create_peer_cfg_enumerator(charon->backends,
+													me, other, my_id, other_id);
+	while (enumerator->enumerate(enumerator, &peer_cfg))
+	{
+		peer_cfg->get_ref(peer_cfg);
+		if (this->peer_cfg == NULL)
+		{	/* best match */
+			this->peer_cfg = peer_cfg;
+			this->ike_sa->set_peer_cfg(this->ike_sa, peer_cfg);
+		}
+		else
+		{
+			this->candidates->insert_last(this->candidates, peer_cfg);
+		}
+	}
+	enumerator->destroy(enumerator);
+	if (this->peer_cfg)
+	{
+		DBG1(DBG_CFG, "selected peer config '%s'",
+			 this->peer_cfg->get_name(this->peer_cfg));
+		return TRUE;
+	}
+	DBG1(DBG_CFG, "no matching peer config found");
+	return FALSE;
+}
+
+/**
+ * update the current peer candidate if necessary, using candidates
+ */
+static bool update_cfg_candidates(private_ike_auth_t *this, bool strict)
+{
+	do
+	{
+		if (this->peer_cfg)
+		{
+			bool complies = TRUE;
+			enumerator_t *e1, *e2, *tmp;
+			auth_cfg_t *c1, *c2;
+
+			e1 = this->ike_sa->create_auth_cfg_enumerator(this->ike_sa, FALSE);
+			e2 = this->peer_cfg->create_auth_cfg_enumerator(this->peer_cfg, FALSE);
+
+			if (strict)
+			{	/* swap lists in strict mode: all configured rounds must be
+				 * fulfilled. If !strict, we check only the rounds done so far. */
+				tmp = e1;
+				e1 = e2;
+				e2 = tmp;
+			}
+			while (e1->enumerate(e1, &c1))
+			{
+				/* check if done authentications comply to configured ones */
+				if ((!e2->enumerate(e2, &c2)) ||
+					(!strict && !c1->complies(c1, c2, TRUE)) ||
+					(strict && !c2->complies(c2, c1, TRUE)))
+				{
+					complies = FALSE;
+					break;
+				}
+			}
+			e1->destroy(e1);
+			e2->destroy(e2);
+			if (complies)
+			{
+				break;
+			}
+			DBG1(DBG_CFG, "selected peer config '%s' inacceptable",
+				 this->peer_cfg->get_name(this->peer_cfg));
+			this->peer_cfg->destroy(this->peer_cfg);
+		}
+		if (this->candidates->remove_first(this->candidates,
+										(void**)&this->peer_cfg) != SUCCESS)
+		{
+			DBG1(DBG_CFG, "no alternative config found");
+			this->peer_cfg = NULL;
+		}
+		else
+		{
+			DBG1(DBG_CFG, "switching to peer config '%s'",
+				 this->peer_cfg->get_name(this->peer_cfg));
+			this->ike_sa->set_peer_cfg(this->ike_sa, this->peer_cfg);
+		}
+	}
+	while (this->peer_cfg);
+
+	return this->peer_cfg != NULL;
+}
+
+/**
+ * Implementation of task_t.build for initiator
+ */
+static status_t build_i(private_ike_auth_t *this, message_t *message)
+{
+	auth_cfg_t *cfg;
+
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		return collect_my_init_data(this, message);
+	}
+
+	if (this->peer_cfg == NULL)
+	{
+		this->peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+		this->peer_cfg->get_ref(this->peer_cfg);
+	}
+
+	if (message->get_message_id(message) == 1)
+	{	/* in the first IKE_AUTH ... */
+		if (this->ike_sa->supports_extension(this->ike_sa, EXT_MULTIPLE_AUTH))
+		{	/* indicate support for multiple authentication */
+			message->add_notify(message, FALSE, MULTIPLE_AUTH_SUPPORTED,
+								chunk_empty);
+		}
+		/* indicate support for EAP-only authentication */
+		message->add_notify(message, FALSE, EAP_ONLY_AUTHENTICATION,
+							chunk_empty);
+	}
+
+	if (!this->do_another_auth && !this->my_auth)
+	{	/* we have done our rounds */
+		return NEED_MORE;
+	}
+
+	/* check if an authenticator is in progress */
+	if (this->my_auth == NULL)
+	{
+		identification_t *id;
+		id_payload_t *id_payload;
+
+		/* clean up authentication config from a previous round */
+		cfg = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+		cfg->purge(cfg, TRUE);
+
+		/* add (optional) IDr */
+		cfg = get_auth_cfg(this, FALSE);
+		if (cfg)
+		{
+			id = cfg->get(cfg, AUTH_RULE_IDENTITY);
+			if (id && !id->contains_wildcards(id))
+			{
+				this->ike_sa->set_other_id(this->ike_sa, id->clone(id));
+				id_payload = id_payload_create_from_identification(
+															ID_RESPONDER, id);
+				message->add_payload(message, (payload_t*)id_payload);
+			}
+		}
+		/* add IDi */
+		cfg = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+		cfg->merge(cfg, get_auth_cfg(this, TRUE), TRUE);
+		id = cfg->get(cfg, AUTH_RULE_IDENTITY);
+		if (!id)
+		{
+			DBG1(DBG_CFG, "configuration misses IDi");
+			return FAILED;
+		}
+		this->ike_sa->set_my_id(this->ike_sa, id->clone(id));
+		id_payload = id_payload_create_from_identification(ID_INITIATOR, id);
+		message->add_payload(message, (payload_t*)id_payload);
+
+		/* build authentication data */
+		this->my_auth = authenticator_create_builder(this->ike_sa, cfg,
+							this->other_nonce, this->my_nonce,
+							this->other_packet->get_data(this->other_packet),
+							this->my_packet->get_data(this->my_packet));
+		if (!this->my_auth)
+		{
+			return FAILED;
+		}
+	}
+	switch (this->my_auth->build(this->my_auth, message))
+	{
+		case SUCCESS:
+			/* authentication step complete, reset authenticator */
+			cfg = auth_cfg_create();
+			cfg->merge(cfg, this->ike_sa->get_auth_cfg(this->ike_sa, TRUE), TRUE);
+			this->ike_sa->add_auth_cfg(this->ike_sa, TRUE, cfg);
+			this->my_auth->destroy(this->my_auth);
+			this->my_auth = NULL;
+			break;
+		case NEED_MORE:
+			break;
+		default:
+			return FAILED;
+	}
+
+	/* check for additional authentication rounds */
+	if (do_another_auth(this))
+	{
+		if (message->get_payload(message, AUTHENTICATION))
+		{
+			message->add_notify(message, FALSE, ANOTHER_AUTH_FOLLOWS, chunk_empty);
+		}
+	}
+	else
+	{
+		this->do_another_auth = FALSE;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_auth_t *this, message_t *message)
+{
+	auth_cfg_t *cfg, *cand;
+	id_payload_t *id_payload;
+	identification_t *id;
+
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		return collect_other_init_data(this, message);
+	}
+
+	if (this->my_auth == NULL && this->do_another_auth)
+	{
+		/* handle (optional) IDr payload, apply proposed identity */
+		id_payload = (id_payload_t*)message->get_payload(message, ID_RESPONDER);
+		if (id_payload)
+		{
+			id = id_payload->get_identification(id_payload);
+		}
+		else
+		{
+			id = identification_create_from_encoding(ID_ANY, chunk_empty);
+		}
+		this->ike_sa->set_my_id(this->ike_sa, id);
+	}
+
+	if (!this->expect_another_auth)
+	{
+		return NEED_MORE;
+	}
+
+	if (message->get_message_id(message) == 1)
+	{	/* check for extensions in the first IKE_AUTH */
+		if (message->get_notify(message, MULTIPLE_AUTH_SUPPORTED))
+		{
+			this->ike_sa->enable_extension(this->ike_sa, EXT_MULTIPLE_AUTH);
+		}
+		if (this->ike_sa->supports_extension(this->ike_sa, EXT_STRONGSWAN) &&
+			message->get_notify(message, EAP_ONLY_AUTHENTICATION))
+		{	/* EAP-only has no official notify, accept only from strongSwan */
+			this->ike_sa->enable_extension(this->ike_sa,
+										   EXT_EAP_ONLY_AUTHENTICATION);
+		}
+	}
+
+	if (this->other_auth == NULL)
+	{
+		/* handle IDi payload */
+		id_payload = (id_payload_t*)message->get_payload(message, ID_INITIATOR);
+		if (!id_payload)
+		{
+			DBG1(DBG_IKE, "IDi payload missing");
+			return FAILED;
+		}
+		id = id_payload->get_identification(id_payload);
+		this->ike_sa->set_other_id(this->ike_sa, id);
+		cfg = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+		cfg->add(cfg, AUTH_RULE_IDENTITY, id->clone(id));
+
+		if (this->peer_cfg == NULL)
+		{
+			if (!load_cfg_candidates(this))
+			{
+				this->authentication_failed = TRUE;
+				return NEED_MORE;
+			}
+		}
+		if (message->get_payload(message, AUTHENTICATION) == NULL)
+		{	/* before authenticating with EAP, we need a EAP config */
+			cand = get_auth_cfg(this, FALSE);
+			while (!cand || (
+					(uintptr_t)cand->get(cand, AUTH_RULE_EAP_TYPE) == EAP_NAK &&
+					(uintptr_t)cand->get(cand, AUTH_RULE_EAP_VENDOR) == 0))
+			{	/* peer requested EAP, but current config does not match */
+				this->peer_cfg->destroy(this->peer_cfg);
+				this->peer_cfg = NULL;
+				if (!update_cfg_candidates(this, FALSE))
+				{
+					this->authentication_failed = TRUE;
+					return NEED_MORE;
+				}
+				cand = get_auth_cfg(this, FALSE);
+			}
+			cfg->merge(cfg, cand, TRUE);
+		}
+
+		/* verify authentication data */
+		this->other_auth = authenticator_create_verifier(this->ike_sa,
+							message, this->other_nonce, this->my_nonce,
+							this->other_packet->get_data(this->other_packet),
+							this->my_packet->get_data(this->my_packet));
+		if (!this->other_auth)
+		{
+			this->authentication_failed = TRUE;
+			return NEED_MORE;
+		}
+	}
+	switch (this->other_auth->process(this->other_auth, message))
+	{
+		case SUCCESS:
+			this->other_auth->destroy(this->other_auth);
+			this->other_auth = NULL;
+			break;
+		case NEED_MORE:
+			if (message->get_payload(message, AUTHENTICATION))
+			{	/* AUTH verification successful, but another build() needed */
+				break;
+			}
+			return NEED_MORE;
+		default:
+			this->authentication_failed = TRUE;
+			return NEED_MORE;
+	}
+
+	/* store authentication information */
+	cfg = auth_cfg_create();
+	cfg->merge(cfg, this->ike_sa->get_auth_cfg(this->ike_sa, FALSE), FALSE);
+	this->ike_sa->add_auth_cfg(this->ike_sa, FALSE, cfg);
+
+	/* another auth round done, invoke authorize hook */
+	if (!charon->bus->authorize(charon->bus, FALSE))
+	{
+		DBG1(DBG_IKE, "authorization hook forbids IKE_SA, cancelling");
+		this->authentication_failed = TRUE;
+		return NEED_MORE;
+	}
+
+	if (!update_cfg_candidates(this, FALSE))
+	{
+		this->authentication_failed = TRUE;
+		return NEED_MORE;
+	}
+
+	if (message->get_notify(message, ANOTHER_AUTH_FOLLOWS) == NULL)
+	{
+		this->expect_another_auth = FALSE;
+		if (!update_cfg_candidates(this, TRUE))
+		{
+			this->authentication_failed = TRUE;
+			return NEED_MORE;
+		}
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_auth_t *this, message_t *message)
+{
+	auth_cfg_t *cfg;
+
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		if (multiple_auth_enabled())
+		{
+			message->add_notify(message, FALSE, MULTIPLE_AUTH_SUPPORTED,
+								chunk_empty);
+		}
+		return collect_my_init_data(this, message);
+	}
+
+	if (this->authentication_failed || this->peer_cfg == NULL)
+	{
+		message->add_notify(message, TRUE, AUTHENTICATION_FAILED, chunk_empty);
+		return FAILED;
+	}
+
+	if (this->my_auth == NULL && this->do_another_auth)
+	{
+		identification_t *id, *id_cfg;
+		id_payload_t *id_payload;
+
+		/* add IDr */
+		cfg = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+		cfg->purge(cfg, TRUE);
+		cfg->merge(cfg, get_auth_cfg(this, TRUE), TRUE);
+
+		id_cfg = cfg->get(cfg, AUTH_RULE_IDENTITY);
+		id = this->ike_sa->get_my_id(this->ike_sa);
+		if (id->get_type(id) == ID_ANY)
+		{	/* no IDr received, apply configured ID */
+			if (!id_cfg || id_cfg->contains_wildcards(id_cfg))
+			{
+				DBG1(DBG_CFG, "IDr not configured and negotiation failed");
+				message->add_notify(message, TRUE, AUTHENTICATION_FAILED,
+									chunk_empty);
+				return FAILED;
+			}
+			this->ike_sa->set_my_id(this->ike_sa, id_cfg->clone(id_cfg));
+			id = id_cfg;
+		}
+		else
+		{	/* IDr received, check if it matches configuration */
+			if (id_cfg && !id->matches(id, id_cfg))
+			{
+				DBG1(DBG_CFG, "received IDr %Y, but require %Y", id, id_cfg);
+				message->add_notify(message, TRUE, AUTHENTICATION_FAILED,
+									chunk_empty);
+				return FAILED;
+			}
+		}
+
+		id_payload = id_payload_create_from_identification(ID_RESPONDER, id);
+		message->add_payload(message, (payload_t*)id_payload);
+
+		if ((uintptr_t)cfg->get(cfg, AUTH_RULE_AUTH_CLASS) == AUTH_CLASS_EAP)
+		{	/* EAP-only authentication */
+			if (!this->ike_sa->supports_extension(this->ike_sa,
+												  EXT_EAP_ONLY_AUTHENTICATION))
+			{
+				DBG1(DBG_IKE, "configured EAP-only authentication, but peer "
+					 "does not support it");
+				message->add_notify(message, TRUE, AUTHENTICATION_FAILED,
+									chunk_empty);
+				return FAILED;
+			}
+		}
+		else
+		{
+			/* build authentication data */
+			this->my_auth = authenticator_create_builder(this->ike_sa, cfg,
+								this->other_nonce, this->my_nonce,
+								this->other_packet->get_data(this->other_packet),
+								this->my_packet->get_data(this->my_packet));
+			if (!this->my_auth)
+			{
+				message->add_notify(message, TRUE, AUTHENTICATION_FAILED,
+									chunk_empty);
+				return FAILED;
+			}
+		}
+	}
+
+	if (this->other_auth)
+	{
+		switch (this->other_auth->build(this->other_auth, message))
+		{
+			case SUCCESS:
+				this->other_auth->destroy(this->other_auth);
+				this->other_auth = NULL;
+				break;
+			case NEED_MORE:
+				break;
+			default:
+				if (!message->get_payload(message, EXTENSIBLE_AUTHENTICATION))
+				{	/* skip AUTHENTICATION_FAILED if we have EAP_FAILURE */
+					message->add_notify(message, TRUE, AUTHENTICATION_FAILED,
+										chunk_empty);
+				}
+				return FAILED;
+		}
+	}
+	if (this->my_auth)
+	{
+		switch (this->my_auth->build(this->my_auth, message))
+		{
+			case SUCCESS:
+				cfg = auth_cfg_create();
+				cfg->merge(cfg, this->ike_sa->get_auth_cfg(this->ike_sa, TRUE),
+						   TRUE);
+				this->ike_sa->add_auth_cfg(this->ike_sa, TRUE, cfg);
+				this->my_auth->destroy(this->my_auth);
+				this->my_auth = NULL;
+				break;
+			case NEED_MORE:
+				break;
+			default:
+				message->add_notify(message, TRUE, AUTHENTICATION_FAILED,
+									chunk_empty);
+				return FAILED;
+		}
+	}
+
+	/* check for additional authentication rounds */
+	if (do_another_auth(this))
+	{
+		message->add_notify(message, FALSE, ANOTHER_AUTH_FOLLOWS, chunk_empty);
+	}
+	else
+	{
+		this->do_another_auth = FALSE;
+	}
+	if (!this->do_another_auth && !this->expect_another_auth)
+	{
+		if (charon->ike_sa_manager->check_uniqueness(charon->ike_sa_manager,
+													 this->ike_sa))
+		{
+			DBG1(DBG_IKE, "cancelling IKE_SA setup due uniqueness policy");
+			message->add_notify(message, TRUE, AUTHENTICATION_FAILED,
+								chunk_empty);
+			return FAILED;
+		}
+		if (!charon->bus->authorize(charon->bus, TRUE))
+		{
+			DBG1(DBG_IKE, "final authorization hook forbids IKE_SA, cancelling");
+			message->add_notify(message, TRUE, AUTHENTICATION_FAILED,
+								chunk_empty);
+			return FAILED;
+		}
+		DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
+			 this->ike_sa->get_name(this->ike_sa),
+			 this->ike_sa->get_unique_id(this->ike_sa),
+			 this->ike_sa->get_my_host(this->ike_sa),
+			 this->ike_sa->get_my_id(this->ike_sa),
+			 this->ike_sa->get_other_host(this->ike_sa),
+			 this->ike_sa->get_other_id(this->ike_sa));
+		this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
+		charon->bus->ike_updown(charon->bus, this->ike_sa, TRUE);
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_auth_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	auth_cfg_t *cfg;
+	bool mutual_eap = FALSE;
+
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		if (message->get_notify(message, MULTIPLE_AUTH_SUPPORTED) &&
+			multiple_auth_enabled())
+		{
+			this->ike_sa->enable_extension(this->ike_sa, EXT_MULTIPLE_AUTH);
+		}
+		return collect_other_init_data(this, message);
+	}
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == NOTIFY)
+		{
+			notify_payload_t *notify = (notify_payload_t*)payload;
+			notify_type_t type = notify->get_notify_type(notify);
+
+			switch (type)
+			{
+				case NO_PROPOSAL_CHOSEN:
+				case SINGLE_PAIR_REQUIRED:
+				case NO_ADDITIONAL_SAS:
+				case INTERNAL_ADDRESS_FAILURE:
+				case FAILED_CP_REQUIRED:
+				case TS_UNACCEPTABLE:
+				case INVALID_SELECTORS:
+					/* these are errors, but are not critical as only the
+					 * CHILD_SA won't get build, but IKE_SA establishes anyway */
+					break;
+				case MOBIKE_SUPPORTED:
+				case ADDITIONAL_IP4_ADDRESS:
+				case ADDITIONAL_IP6_ADDRESS:
+					/* handled in ike_mobike task */
+					break;
+				case AUTH_LIFETIME:
+					/* handled in ike_auth_lifetime task */
+					break;
+				case ME_ENDPOINT:
+					/* handled in ike_me task */
+					break;
+				default:
+				{
+					if (type < 16383)
+					{
+						DBG1(DBG_IKE, "received %N notify error",
+							 notify_type_names, type);
+						enumerator->destroy(enumerator);
+						return FAILED;
+					}
+					DBG2(DBG_IKE, "received %N notify",
+						notify_type_names, type);
+					break;
+				}
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	if (this->expect_another_auth)
+	{
+		if (this->other_auth == NULL)
+		{
+			id_payload_t *id_payload;
+			identification_t *id;
+
+			/* handle IDr payload */
+			id_payload = (id_payload_t*)message->get_payload(message,
+															 ID_RESPONDER);
+			if (!id_payload)
+			{
+				DBG1(DBG_IKE, "IDr payload missing");
+				return FAILED;
+			}
+			id = id_payload->get_identification(id_payload);
+			this->ike_sa->set_other_id(this->ike_sa, id);
+			cfg = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+			cfg->add(cfg, AUTH_RULE_IDENTITY, id->clone(id));
+
+			if (message->get_payload(message, AUTHENTICATION))
+			{
+				/* verify authentication data */
+				this->other_auth = authenticator_create_verifier(this->ike_sa,
+								message, this->other_nonce, this->my_nonce,
+								this->other_packet->get_data(this->other_packet),
+								this->my_packet->get_data(this->my_packet));
+				if (!this->other_auth)
+				{
+					return FAILED;
+				}
+			}
+			else
+			{
+				/* responder omitted AUTH payload, indicating EAP-only */
+				mutual_eap = TRUE;
+			}
+		}
+		if (this->other_auth)
+		{
+			switch (this->other_auth->process(this->other_auth, message))
+			{
+				case SUCCESS:
+					break;
+				case NEED_MORE:
+					return NEED_MORE;
+				default:
+					return FAILED;
+			}
+			this->other_auth->destroy(this->other_auth);
+			this->other_auth = NULL;
+		}
+		/* store authentication information, reset authenticator */
+		cfg = auth_cfg_create();
+		cfg->merge(cfg, this->ike_sa->get_auth_cfg(this->ike_sa, FALSE), FALSE);
+		this->ike_sa->add_auth_cfg(this->ike_sa, FALSE, cfg);
+
+		/* another auth round done, invoke authorize hook */
+		if (!charon->bus->authorize(charon->bus, FALSE))
+		{
+			DBG1(DBG_IKE, "authorization forbids IKE_SA, cancelling");
+			return FAILED;
+		}
+	}
+
+	if (this->my_auth)
+	{
+		switch (this->my_auth->process(this->my_auth, message))
+		{
+			case SUCCESS:
+				cfg = auth_cfg_create();
+				cfg->merge(cfg, this->ike_sa->get_auth_cfg(this->ike_sa, TRUE),
+						   TRUE);
+				this->ike_sa->add_auth_cfg(this->ike_sa, TRUE, cfg);
+				this->my_auth->destroy(this->my_auth);
+				this->my_auth = NULL;
+				this->do_another_auth = do_another_auth(this);
+				break;
+			case NEED_MORE:
+				break;
+			default:
+				return FAILED;
+		}
+	}
+	if (mutual_eap)
+	{
+		if (!this->my_auth || !this->my_auth->is_mutual(this->my_auth))
+		{
+			DBG1(DBG_IKE, "do not allow non-mutual EAP-only authentication");
+			return FAILED;
+		}
+		DBG1(DBG_IKE, "allow mutual EAP-only authentication");
+	}
+
+	if (message->get_notify(message, ANOTHER_AUTH_FOLLOWS) == NULL)
+	{
+		this->expect_another_auth = FALSE;
+	}
+	if (!this->expect_another_auth && !this->do_another_auth && !this->my_auth)
+	{
+		if (!update_cfg_candidates(this, TRUE))
+		{
+			return FAILED;
+		}
+		if (!charon->bus->authorize(charon->bus, TRUE))
+		{
+			DBG1(DBG_IKE, "final authorization hook forbids IKE_SA, cancelling");
+			return FAILED;
+		}
+		DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
+			 this->ike_sa->get_name(this->ike_sa),
+			 this->ike_sa->get_unique_id(this->ike_sa),
+			 this->ike_sa->get_my_host(this->ike_sa),
+			 this->ike_sa->get_my_id(this->ike_sa),
+			 this->ike_sa->get_other_host(this->ike_sa),
+			 this->ike_sa->get_other_id(this->ike_sa));
+		this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
+		charon->bus->ike_updown(charon->bus, this->ike_sa, TRUE);
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_auth_t *this)
+{
+	return IKE_AUTHENTICATE;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_auth_t *this, ike_sa_t *ike_sa)
+{
+	chunk_free(&this->my_nonce);
+	chunk_free(&this->other_nonce);
+	DESTROY_IF(this->my_packet);
+	DESTROY_IF(this->other_packet);
+	DESTROY_IF(this->peer_cfg);
+	DESTROY_IF(this->my_auth);
+	DESTROY_IF(this->other_auth);
+	this->candidates->destroy_offset(this->candidates, offsetof(peer_cfg_t, destroy));
+
+	this->my_packet = NULL;
+	this->other_packet = NULL;
+	this->ike_sa = ike_sa;
+	this->peer_cfg = NULL;
+	this->my_auth = NULL;
+	this->other_auth = NULL;
+	this->do_another_auth = TRUE;
+	this->expect_another_auth = TRUE;
+	this->authentication_failed = FALSE;
+	this->candidates = linked_list_create();
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_auth_t *this)
+{
+	chunk_free(&this->my_nonce);
+	chunk_free(&this->other_nonce);
+	DESTROY_IF(this->my_packet);
+	DESTROY_IF(this->other_packet);
+	DESTROY_IF(this->my_auth);
+	DESTROY_IF(this->other_auth);
+	DESTROY_IF(this->peer_cfg);
+	this->candidates->destroy_offset(this->candidates, offsetof(peer_cfg_t, destroy));
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_auth_t *ike_auth_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_auth_t *this = malloc_thing(private_ike_auth_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+
+	this->ike_sa = ike_sa;
+	this->initiator = initiator;
+	this->my_nonce = chunk_empty;
+	this->other_nonce = chunk_empty;
+	this->my_packet = NULL;
+	this->other_packet = NULL;
+	this->peer_cfg = NULL;
+	this->candidates = linked_list_create();
+	this->my_auth = NULL;
+	this->other_auth = NULL;
+	this->do_another_auth = TRUE;
+	this->expect_another_auth = TRUE;
+	this->authentication_failed = FALSE;
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/tasks/ike_auth.h b/src/libcharon/sa/tasks/ike_auth.h
new file mode 100644
index 000000000..bba46d961
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_auth.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_auth ike_auth
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_AUTH_H_
+#define IKE_AUTH_H_
+
+typedef struct ike_auth_t ike_auth_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type ike_auth, authenticates an IKE_SA using authenticators.
+ *
+ * The ike_auth task authenticates the IKE_SA using the IKE_AUTH
+ * exchange. It processes and build IDi and IDr payloads and also
+ * handles AUTH payloads. The AUTH payloads are passed to authenticator_t's,
+ * which do the actual authentication process. If the ike_auth task is used
+ * with EAP authentication, it stays alive over multiple exchanges until
+ * EAP has completed.
+ */
+struct ike_auth_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+};
+
+/**
+ * Create a new task of type IKE_AUTHENTICATE.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if thask is the initator of an exchange
+ * @return				ike_auth task to handle by the task_manager
+ */
+ike_auth_t *ike_auth_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_AUTH_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_auth_lifetime.c b/src/libcharon/sa/tasks/ike_auth_lifetime.c
new file mode 100644
index 000000000..75ff35168
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_auth_lifetime.c
@@ -0,0 +1,182 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_auth_lifetime.h"
+
+#include <time.h>
+
+#include <daemon.h>
+#include <encoding/payloads/notify_payload.h>
+
+
+typedef struct private_ike_auth_lifetime_t private_ike_auth_lifetime_t;
+
+/**
+ * Private members of a ike_auth_lifetime_t task.
+ */
+struct private_ike_auth_lifetime_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_auth_lifetime_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+};
+
+/**
+ * add the AUTH_LIFETIME notify to the message
+ */
+static void add_auth_lifetime(private_ike_auth_lifetime_t *this, message_t *message)
+{
+	chunk_t chunk;
+	u_int32_t lifetime;
+
+	lifetime = this->ike_sa->get_statistic(this->ike_sa, STAT_REAUTH);
+	if (lifetime)
+	{
+		lifetime -= time_monotonic(NULL);
+		chunk = chunk_from_thing(lifetime);
+		*(u_int32_t*)chunk.ptr = htonl(lifetime);
+		message->add_notify(message, FALSE, AUTH_LIFETIME, chunk);
+	}
+}
+
+/**
+ * read notifys from message and evaluate them
+ */
+static void process_payloads(private_ike_auth_lifetime_t *this, message_t *message)
+{
+	notify_payload_t *notify;
+	chunk_t data;
+	u_int32_t lifetime;
+
+	notify = message->get_notify(message, AUTH_LIFETIME);
+	if (notify)
+	{
+		data = notify->get_notification_data(notify);
+		lifetime = ntohl(*(u_int32_t*)data.ptr);
+		this->ike_sa->set_auth_lifetime(this->ike_sa, lifetime);
+	}
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t build_i(private_ike_auth_lifetime_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == INFORMATIONAL)
+	{
+		add_auth_lifetime(this, message);
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_auth_lifetime_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == INFORMATIONAL)
+	{
+		process_payloads(this, message);
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_auth_lifetime_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_AUTH &&
+		this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
+	{
+		add_auth_lifetime(this, message);
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_auth_lifetime_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_AUTH &&
+		this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
+	{
+		process_payloads(this, message);
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_auth_lifetime_t *this)
+{
+	return IKE_AUTH_LIFETIME;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_auth_lifetime_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_auth_lifetime_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_auth_lifetime_t *ike_auth_lifetime_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_auth_lifetime_t *this = malloc_thing(private_ike_auth_lifetime_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+
+	this->ike_sa = ike_sa;
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/tasks/ike_auth_lifetime.h b/src/libcharon/sa/tasks/ike_auth_lifetime.h
new file mode 100644
index 000000000..3b129b9e3
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_auth_lifetime.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_auth_lifetime ike_auth_lifetime
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_AUTH_LIFETIME_H_
+#define IKE_AUTH_LIFETIME_H_
+
+typedef struct ike_auth_lifetime_t ike_auth_lifetime_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type IKE_AUTH_LIFETIME, implements RFC4478.
+ *
+ * This task exchanges lifetimes for IKE_AUTH to force a client to
+ * reauthenticate before the responders lifetime reaches the limit.
+ */
+struct ike_auth_lifetime_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+};
+
+/**
+ * Create a new IKE_AUTH_LIFETIME task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if taks is initiated by us
+ * @return				ike_auth_lifetime task to handle by the task_manager
+ */
+ike_auth_lifetime_t *ike_auth_lifetime_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_MOBIKE_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_cert_post.c b/src/libcharon/sa/tasks/ike_cert_post.c
new file mode 100644
index 000000000..c831df975
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_cert_post.c
@@ -0,0 +1,261 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2006-2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_cert_post.h"
+
+#include <daemon.h>
+#include <sa/ike_sa.h>
+#include <encoding/payloads/cert_payload.h>
+#include <encoding/payloads/certreq_payload.h>
+#include <encoding/payloads/auth_payload.h>
+#include <credentials/certificates/x509.h>
+
+
+typedef struct private_ike_cert_post_t private_ike_cert_post_t;
+
+/**
+ * Private members of a ike_cert_post_t task.
+ */
+struct private_ike_cert_post_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_cert_post_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+};
+
+/**
+ * Generates the cert payload, if possible with "Hash and URL"
+ */
+static cert_payload_t *build_cert_payload(private_ike_cert_post_t *this,
+										 certificate_t *cert)
+{
+	hasher_t *hasher;
+	identification_t *id;
+	chunk_t hash, encoded ;
+	enumerator_t *enumerator;
+	char *url;
+	cert_payload_t *payload = NULL;
+
+	if (!this->ike_sa->supports_extension(this->ike_sa, EXT_HASH_AND_URL))
+	{
+		return cert_payload_create_from_cert(cert);
+	}
+
+	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
+	if (!hasher)
+	{
+		DBG1(DBG_IKE, "unable to use hash-and-url: sha1 not supported");
+		return cert_payload_create_from_cert(cert);
+	}
+
+	encoded = cert->get_encoding(cert);
+	hasher->allocate_hash(hasher, encoded, &hash);
+	chunk_free(&encoded);
+	hasher->destroy(hasher);
+	id = identification_create_from_encoding(ID_KEY_ID, hash);
+
+	enumerator = charon->credentials->create_cdp_enumerator(charon->credentials,
+															CERT_X509, id);
+	if (enumerator->enumerate(enumerator, &url))
+	{
+		payload = cert_payload_create_from_hash_and_url(hash, url);
+	}
+	else
+	{
+		payload = cert_payload_create_from_cert(cert);
+	}
+	enumerator->destroy(enumerator);
+	chunk_free(&hash);
+	id->destroy(id);
+	return payload;
+}
+
+/**
+ * add certificates to message
+ */
+static void build_certs(private_ike_cert_post_t *this, message_t *message)
+{
+	peer_cfg_t *peer_cfg;
+	auth_payload_t *payload;
+
+	payload = (auth_payload_t*)message->get_payload(message, AUTHENTICATION);
+	peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+	if (!peer_cfg || !payload || payload->get_auth_method(payload) == AUTH_PSK)
+	{	/* no CERT payload for EAP/PSK */
+		return;
+	}
+
+	switch (peer_cfg->get_cert_policy(peer_cfg))
+	{
+		case CERT_NEVER_SEND:
+			break;
+		case CERT_SEND_IF_ASKED:
+			if (!this->ike_sa->has_condition(this->ike_sa, COND_CERTREQ_SEEN))
+			{
+				break;
+			}
+			/* FALL */
+		case CERT_ALWAYS_SEND:
+		{
+			cert_payload_t *payload;
+			enumerator_t *enumerator;
+			certificate_t *cert;
+			auth_rule_t type;
+			auth_cfg_t *auth;
+
+			auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+
+			/* get subject cert first, then issuing certificates */
+			cert = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
+			if (!cert)
+			{
+				break;
+			}
+			payload = build_cert_payload(this, cert);
+			if (!payload)
+			{
+				break;
+			}
+			DBG1(DBG_IKE, "sending end entity cert \"%Y\"",
+				 cert->get_subject(cert));
+			message->add_payload(message, (payload_t*)payload);
+
+			enumerator = auth->create_enumerator(auth);
+			while (enumerator->enumerate(enumerator, &type, &cert))
+			{
+				if (type == AUTH_RULE_IM_CERT)
+				{
+					payload = cert_payload_create_from_cert(cert);
+					if (payload)
+					{
+						DBG1(DBG_IKE, "sending issuer cert \"%Y\"",
+							 cert->get_subject(cert));
+						message->add_payload(message, (payload_t*)payload);
+					}
+				}
+			}
+			enumerator->destroy(enumerator);
+		}
+	}
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t build_i(private_ike_cert_post_t *this, message_t *message)
+{
+	build_certs(this, message);
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_cert_post_t *this, message_t *message)
+{
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_cert_post_t *this, message_t *message)
+{
+	build_certs(this, message);
+
+	if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
+	{	/* stay alive, we might have additional rounds with certs */
+		return NEED_MORE;
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_cert_post_t *this, message_t *message)
+{
+	if (this->ike_sa->get_state(this->ike_sa) != IKE_ESTABLISHED)
+	{	/* stay alive, we might have additional rounds with CERTS */
+		return NEED_MORE;
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_cert_post_t *this)
+{
+	return IKE_CERT_POST;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_cert_post_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_cert_post_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_cert_post_t *ike_cert_post_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_cert_post_t *this = malloc_thing(private_ike_cert_post_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+
+	this->ike_sa = ike_sa;
+	this->initiator = initiator;
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/tasks/ike_cert_post.h b/src/libcharon/sa/tasks/ike_cert_post.h
new file mode 100644
index 000000000..a21f45927
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_cert_post.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2007-2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_cert_post ike_cert_post
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_CERT_POST_H_
+#define IKE_CERT_POST_H_
+
+typedef struct ike_cert_post_t ike_cert_post_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type ike_cert_post, certificate processing after authentication.
+ */
+struct ike_cert_post_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+};
+
+/**
+ * Create a new ike_cert_post task.
+ *
+ * The initiator parameter means the original initiator, not the initiator
+ * of the certificate request.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if thask is the original initator
+ * @return				ike_cert_post task to handle by the task_manager
+ */
+ike_cert_post_t *ike_cert_post_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_CERT_POST_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_cert_pre.c b/src/libcharon/sa/tasks/ike_cert_pre.c
new file mode 100644
index 000000000..0805d0290
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_cert_pre.c
@@ -0,0 +1,524 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2006-2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_cert_pre.h"
+
+#include <daemon.h>
+#include <sa/ike_sa.h>
+#include <encoding/payloads/cert_payload.h>
+#include <encoding/payloads/certreq_payload.h>
+#include <credentials/certificates/x509.h>
+
+
+typedef struct private_ike_cert_pre_t private_ike_cert_pre_t;
+
+/**
+ * Private members of a ike_cert_pre_t task.
+ */
+struct private_ike_cert_pre_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_cert_pre_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * Do we accept HTTP certificate lookup requests
+	 */
+	bool do_http_lookup;
+
+	/**
+	 * wheter this is the final authentication round
+	 */
+	bool final;
+};
+
+/**
+ * read certificate requests
+ */
+static void process_certreqs(private_ike_cert_pre_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	auth_cfg_t *auth;
+
+	auth = this->ike_sa->get_auth_cfg(this->ike_sa, TRUE);
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		switch (payload->get_type(payload))
+		{
+			case CERTIFICATE_REQUEST:
+			{
+				certreq_payload_t *certreq = (certreq_payload_t*)payload;
+				enumerator_t *enumerator;
+				chunk_t keyid;
+
+				this->ike_sa->set_condition(this->ike_sa, COND_CERTREQ_SEEN, TRUE);
+
+				if (certreq->get_cert_type(certreq) != CERT_X509)
+				{
+					DBG1(DBG_IKE, "cert payload %N not supported - ignored",
+						 certificate_type_names, certreq->get_cert_type(certreq));
+					break;
+				}
+				enumerator = certreq->create_keyid_enumerator(certreq);
+				while (enumerator->enumerate(enumerator, &keyid))
+				{
+					identification_t *id;
+					certificate_t *cert;
+
+					id = identification_create_from_encoding(ID_KEY_ID, keyid);
+					cert = charon->credentials->get_cert(charon->credentials,
+											CERT_X509, KEY_ANY, id, TRUE);
+					if (cert)
+					{
+						DBG1(DBG_IKE, "received cert request for \"%Y\"",
+							 cert->get_subject(cert));
+						auth->add(auth, AUTH_RULE_CA_CERT, cert);
+					}
+					else
+					{
+						DBG1(DBG_IKE, "received cert request for unknown ca "
+									  "with keyid %Y", id);
+					}
+					id->destroy(id);
+				}
+				enumerator->destroy(enumerator);
+				break;
+			}
+			case NOTIFY:
+			{
+				notify_payload_t *notify = (notify_payload_t*)payload;
+
+				/* we only handle one type of notify here */
+				if (notify->get_notify_type(notify) == HTTP_CERT_LOOKUP_SUPPORTED)
+				{
+					this->ike_sa->enable_extension(this->ike_sa, EXT_HASH_AND_URL);
+				}
+				break;
+			}
+			default:
+				/* ignore other payloads here, these are handled elsewhere */
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * tries to extract a certificate from the cert payload or the credential
+ * manager (based on the hash of a "Hash and URL" encoded cert).
+ * Note: the returned certificate (if any) has to be destroyed
+ */
+static certificate_t *try_get_cert(cert_payload_t *cert_payload)
+{
+	certificate_t *cert = NULL;
+
+	switch (cert_payload->get_cert_encoding(cert_payload))
+	{
+		case ENC_X509_SIGNATURE:
+		{
+			cert = cert_payload->get_cert(cert_payload);
+			break;
+		}
+		case ENC_X509_HASH_AND_URL:
+		{
+			identification_t *id;
+			chunk_t hash = cert_payload->get_hash(cert_payload);
+			if (!hash.ptr)
+			{
+				/* invalid "Hash and URL" data (logged elsewhere) */
+				break;
+			}
+			id = identification_create_from_encoding(ID_KEY_ID, hash);
+			cert = charon->credentials->get_cert(charon->credentials,
+												 CERT_X509, KEY_ANY, id, FALSE);
+			id->destroy(id);
+			break;
+		}
+		default:
+		{
+			break;
+		}
+	}
+	return cert;
+}
+
+/**
+ * import certificates
+ */
+static void process_certs(private_ike_cert_pre_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	auth_cfg_t *auth;
+	bool first = TRUE;
+
+	auth = this->ike_sa->get_auth_cfg(this->ike_sa, FALSE);
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == CERTIFICATE)
+		{
+			cert_payload_t *cert_payload;
+			cert_encoding_t encoding;
+			certificate_t *cert;
+			char *url;
+
+			cert_payload = (cert_payload_t*)payload;
+			encoding = cert_payload->get_cert_encoding(cert_payload);
+
+			switch (encoding)
+			{
+				case ENC_X509_HASH_AND_URL:
+				{
+					if (!this->do_http_lookup)
+					{
+						DBG1(DBG_IKE, "received hash-and-url encoded cert, but"
+								" we don't accept them, ignore");
+						break;
+					}
+					/* FALL */
+				}
+				case ENC_X509_SIGNATURE:
+				{
+					cert = try_get_cert(cert_payload);
+					if (cert)
+					{
+						if (first)
+						{	/* the first is an end entity certificate */
+							DBG1(DBG_IKE, "received end entity cert \"%Y\"",
+								 cert->get_subject(cert));
+							auth->add(auth, AUTH_HELPER_SUBJECT_CERT, cert);
+							first = FALSE;
+						}
+						else
+						{
+							DBG1(DBG_IKE, "received issuer cert \"%Y\"",
+								 cert->get_subject(cert));
+							auth->add(auth, AUTH_HELPER_IM_CERT, cert);
+						}
+					}
+					else if (encoding == ENC_X509_HASH_AND_URL)
+					{
+						/* we fetch the certificate not yet, but only if
+						 * it is really needed during authentication */
+						url = cert_payload->get_url(cert_payload);
+						if (!url)
+						{
+							DBG1(DBG_IKE, "received invalid hash-and-url "
+								 "encoded cert, ignore");
+							break;
+						}
+						url = strdup(url);
+						if (first)
+						{	/* first URL is for an end entity certificate */
+							DBG1(DBG_IKE, "received hash-and-url for end"
+								 " entity cert \"%s\"", url);
+							auth->add(auth, AUTH_HELPER_SUBJECT_HASH_URL, url);
+							first = FALSE;
+						}
+						else
+						{
+							DBG1(DBG_IKE, "received hash-and-url for issuer"
+									" cert \"%s\"", url);
+							auth->add(auth, AUTH_HELPER_IM_HASH_URL, url);
+						}
+					}
+					break;
+				}
+				case ENC_PKCS7_WRAPPED_X509:
+				case ENC_PGP:
+				case ENC_DNS_SIGNED_KEY:
+				case ENC_KERBEROS_TOKEN:
+				case ENC_CRL:
+				case ENC_ARL:
+				case ENC_SPKI:
+				case ENC_X509_ATTRIBUTE:
+				case ENC_RAW_RSA_KEY:
+				case ENC_X509_HASH_AND_URL_BUNDLE:
+				case ENC_OCSP_CONTENT:
+				default:
+					DBG1(DBG_ENC, "certificate encoding %N not supported",
+						 cert_encoding_names, encoding);
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * add the keyid of a certificate to the certificate request payload
+ */
+static void add_certreq(certreq_payload_t **req, certificate_t *cert)
+{
+	switch (cert->get_type(cert))
+	{
+		case CERT_X509:
+		{
+			public_key_t *public;
+			chunk_t keyid;
+			x509_t *x509 = (x509_t*)cert;
+
+			if (!(x509->get_flags(x509) & X509_CA))
+			{	/* no CA cert, skip */
+				break;
+			}
+			public = cert->get_public_key(cert);
+			if (!public)
+			{
+				break;
+			}
+			if (*req == NULL)
+			{
+				*req = certreq_payload_create_type(CERT_X509);
+			}
+			if (public->get_fingerprint(public, KEY_ID_PUBKEY_INFO_SHA1, &keyid))
+			{
+				(*req)->add_keyid(*req, keyid);
+				DBG1(DBG_IKE, "sending cert request for \"%Y\"",
+					 cert->get_subject(cert));
+			}
+			public->destroy(public);
+			break;
+		}
+		default:
+			break;
+	}
+}
+
+/**
+ * add a auth_cfg's CA certificates to the certificate request
+ */
+static void add_certreqs(certreq_payload_t **req, auth_cfg_t *auth)
+{
+	enumerator_t *enumerator;
+	auth_rule_t type;
+	void *value;
+
+	enumerator = auth->create_enumerator(auth);
+	while (enumerator->enumerate(enumerator, &type, &value))
+	{
+		switch (type)
+		{
+			case AUTH_RULE_CA_CERT:
+				add_certreq(req, (certificate_t*)value);
+				break;
+			default:
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * build certificate requests
+ */
+static void build_certreqs(private_ike_cert_pre_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	ike_cfg_t *ike_cfg;
+	peer_cfg_t *peer_cfg;
+	certificate_t *cert;
+	auth_cfg_t *auth;
+	certreq_payload_t *req = NULL;
+
+	ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
+	if (!ike_cfg->send_certreq(ike_cfg))
+	{
+		return;
+	}
+
+	/* check if we require a specific CA for that peer */
+	peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+	if (peer_cfg)
+	{
+		enumerator = peer_cfg->create_auth_cfg_enumerator(peer_cfg, FALSE);
+		while (enumerator->enumerate(enumerator, &auth))
+		{
+			add_certreqs(&req, auth);
+		}
+		enumerator->destroy(enumerator);
+	}
+
+	if (!req)
+	{
+		/* otherwise add all trusted CA certificates */
+		enumerator = charon->credentials->create_cert_enumerator(
+							charon->credentials, CERT_ANY, KEY_ANY, NULL, TRUE);
+		while (enumerator->enumerate(enumerator, &cert))
+		{
+			add_certreq(&req, cert);
+		}
+		enumerator->destroy(enumerator);
+	}
+
+	if (req)
+	{
+		message->add_payload(message, (payload_t*)req);
+
+		if (lib->settings->get_bool(lib->settings, "charon.hash_and_url", FALSE))
+		{
+			message->add_notify(message, FALSE, HTTP_CERT_LOOKUP_SUPPORTED,
+								chunk_empty);
+			this->do_http_lookup = TRUE;
+		}
+	}
+}
+
+/**
+ * Check if this is the final authentication round
+ */
+static bool final_auth(message_t *message)
+{
+	/* we check for an AUTH payload without a ANOTHER_AUTH_FOLLOWS notify */
+	if (message->get_payload(message, AUTHENTICATION) == NULL)
+	{
+		return FALSE;
+	}
+	if (message->get_notify(message, ANOTHER_AUTH_FOLLOWS))
+	{
+		return FALSE;
+	}
+	return TRUE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t build_i(private_ike_cert_pre_t *this, message_t *message)
+{
+	if (message->get_message_id(message) == 1)
+	{	/* initiator sends CERTREQs in first IKE_AUTH */
+		build_certreqs(this, message);
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_cert_pre_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) != IKE_SA_INIT)
+	{	/* handle certreqs/certs in any IKE_AUTH, just in case */
+		process_certreqs(this, message);
+		process_certs(this, message);
+	}
+	this->final = final_auth(message);
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_cert_pre_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		build_certreqs(this, message);
+	}
+	if (this->final)
+	{
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_cert_pre_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		process_certreqs(this, message);
+	}
+	process_certs(this, message);
+
+	if (final_auth(message))
+	{
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_cert_pre_t *this)
+{
+	return IKE_CERT_PRE;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_cert_pre_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_cert_pre_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_cert_pre_t *ike_cert_pre_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_cert_pre_t *this = malloc_thing(private_ike_cert_pre_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+
+	this->ike_sa = ike_sa;
+	this->initiator = initiator;
+	this->do_http_lookup = FALSE;
+	this->final = FALSE;
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/ike_cert_pre.h b/src/libcharon/sa/tasks/ike_cert_pre.h
new file mode 100644
index 000000000..1541b80e5
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_cert_pre.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2007-2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_cert_pre ike_cert_pre
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_CERT_PRE_H_
+#define IKE_CERT_PRE_H_
+
+typedef struct ike_cert_pre_t ike_cert_pre_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type ike_cert_post, certificate processing before authentication.
+ */
+struct ike_cert_pre_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+};
+
+/**
+ * Create a new ike_cert_pre task.
+ *
+ * The initiator parameter means the original initiator, not the initiator
+ * of the certificate request.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if thask is the original initator
+ * @return				ike_cert_pre task to handle by the task_manager
+ */
+ike_cert_pre_t *ike_cert_pre_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_CERT_PRE_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_config.c b/src/libcharon/sa/tasks/ike_config.c
new file mode 100644
index 000000000..58bcf0762
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_config.c
@@ -0,0 +1,448 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_config.h"
+
+#include <daemon.h>
+#include <hydra.h>
+#include <encoding/payloads/cp_payload.h>
+
+typedef struct private_ike_config_t private_ike_config_t;
+
+/**
+ * Private members of a ike_config_t task.
+ */
+struct private_ike_config_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_config_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * virtual ip
+	 */
+	host_t *virtual_ip;
+
+	/**
+	 * list of attributes requested and its handler, entry_t
+	 */
+	linked_list_t *requested;
+};
+
+/**
+ * Entry for a requested attribute and the requesting handler
+ */
+typedef struct {
+	/** attribute requested */
+	configuration_attribute_type_t type;
+	/** handler requesting this attribute */
+	attribute_handler_t *handler;
+} entry_t;
+
+/**
+ * build INTERNAL_IPV4/6_ADDRESS attribute from virtual ip
+ */
+static configuration_attribute_t *build_vip(host_t *vip)
+{
+	configuration_attribute_type_t type;
+	chunk_t chunk, prefix;
+
+	if (vip->get_family(vip) == AF_INET)
+	{
+		type = INTERNAL_IP4_ADDRESS;
+		if (vip->is_anyaddr(vip))
+		{
+			chunk = chunk_empty;
+		}
+		else
+		{
+			chunk = vip->get_address(vip);
+		}
+	}
+	else
+	{
+		type = INTERNAL_IP6_ADDRESS;
+		if (vip->is_anyaddr(vip))
+		{
+			chunk = chunk_empty;
+		}
+		else
+		{
+			prefix = chunk_alloca(1);
+			*prefix.ptr = 64;
+			chunk = vip->get_address(vip);
+			chunk = chunk_cata("cc", chunk, prefix);
+		}
+	}
+	return configuration_attribute_create_value(type, chunk);
+}
+
+/**
+ * Handle a received attribute as initiator
+ */
+static void handle_attribute(private_ike_config_t *this,
+							 configuration_attribute_t *ca)
+{
+	attribute_handler_t *handler = NULL;
+	enumerator_t *enumerator;
+	entry_t *entry;
+
+	/* find the handler which requested this attribute */
+	enumerator = this->requested->create_enumerator(this->requested);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (entry->type == ca->get_type(ca))
+		{
+			handler = entry->handler;
+			this->requested->remove_at(this->requested, enumerator);
+			free(entry);
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	/* and pass it to the handle function */
+	handler = hydra->attributes->handle(hydra->attributes,
+							this->ike_sa->get_other_id(this->ike_sa), handler,
+							ca->get_type(ca), ca->get_value(ca));
+	if (handler)
+	{
+		this->ike_sa->add_configuration_attribute(this->ike_sa,
+				handler, ca->get_type(ca), ca->get_value(ca));
+	}
+}
+
+/**
+ * process a single configuration attribute
+ */
+static void process_attribute(private_ike_config_t *this,
+							  configuration_attribute_t *ca)
+{
+	host_t *ip;
+	chunk_t addr;
+	int family = AF_INET6;
+
+	switch (ca->get_type(ca))
+	{
+		case INTERNAL_IP4_ADDRESS:
+			family = AF_INET;
+			/* fall */
+		case INTERNAL_IP6_ADDRESS:
+		{
+			addr = ca->get_value(ca);
+			if (addr.len == 0)
+			{
+				ip = host_create_any(family);
+			}
+			else
+			{
+				/* skip prefix byte in IPv6 payload*/
+				if (family == AF_INET6)
+				{
+					addr.len--;
+				}
+				ip = host_create_from_chunk(family, addr, 0);
+			}
+			if (ip)
+			{
+				DESTROY_IF(this->virtual_ip);
+				this->virtual_ip = ip;
+			}
+			break;
+		}
+		default:
+		{
+			if (this->initiator)
+			{
+				handle_attribute(this, ca);
+			}
+		}
+	}
+}
+
+/**
+ * Scan for configuration payloads and attributes
+ */
+static void process_payloads(private_ike_config_t *this, message_t *message)
+{
+	enumerator_t *enumerator, *attributes;
+	payload_t *payload;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == CONFIGURATION)
+		{
+			cp_payload_t *cp = (cp_payload_t*)payload;
+			configuration_attribute_t *ca;
+
+			switch (cp->get_type(cp))
+			{
+				case CFG_REQUEST:
+				case CFG_REPLY:
+				{
+					attributes = cp->create_attribute_enumerator(cp);
+					while (attributes->enumerate(attributes, &ca))
+					{
+						DBG2(DBG_IKE, "processing %N attribute",
+							 configuration_attribute_type_names, ca->get_type(ca));
+						process_attribute(this, ca);
+					}
+					attributes->destroy(attributes);
+					break;
+				}
+				default:
+					DBG1(DBG_IKE, "ignoring %N config payload",
+						 config_type_names, cp->get_type(cp));
+					break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t build_i(private_ike_config_t *this, message_t *message)
+{
+	if (message->get_message_id(message) == 1)
+	{	/* in first IKE_AUTH only */
+		cp_payload_t *cp = NULL;
+		enumerator_t *enumerator;
+		attribute_handler_t *handler;
+		peer_cfg_t *config;
+		configuration_attribute_type_t type;
+		chunk_t data;
+		host_t *vip;
+
+		/* reuse virtual IP if we already have one */
+		vip = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
+		if (!vip)
+		{
+			config = this->ike_sa->get_peer_cfg(this->ike_sa);
+			vip = config->get_virtual_ip(config);
+		}
+		if (vip)
+		{
+			cp = cp_payload_create_type(CFG_REQUEST);
+			cp->add_attribute(cp, build_vip(vip));
+		}
+
+		enumerator = hydra->attributes->create_initiator_enumerator(hydra->attributes,
+								this->ike_sa->get_other_id(this->ike_sa), vip);
+		while (enumerator->enumerate(enumerator, &handler, &type, &data))
+		{
+			configuration_attribute_t *ca;
+			entry_t *entry;
+
+			/* create configuration attribute */
+			DBG2(DBG_IKE, "building %N attribute",
+				 configuration_attribute_type_names, type);
+			ca = configuration_attribute_create_value(type, data);
+			if (!cp)
+			{
+				cp = cp_payload_create_type(CFG_REQUEST);
+			}
+			cp->add_attribute(cp, ca);
+
+			/* save handler along with requested type */
+			entry = malloc_thing(entry_t);
+			entry->type = type;
+			entry->handler = handler;
+
+			this->requested->insert_last(this->requested, entry);
+		}
+		enumerator->destroy(enumerator);
+
+		if (cp)
+		{
+			message->add_payload(message, (payload_t*)cp);
+		}
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_config_t *this, message_t *message)
+{
+	if (message->get_message_id(message) == 1)
+	{	/* in first IKE_AUTH only */
+		process_payloads(this, message);
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_config_t *this, message_t *message)
+{
+	if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
+	{	/* in last IKE_AUTH exchange */
+		enumerator_t *enumerator;
+		configuration_attribute_type_t type;
+		chunk_t value;
+		host_t *vip = NULL;
+		cp_payload_t *cp = NULL;
+		peer_cfg_t *config;
+		identification_t *id;
+
+		id = this->ike_sa->get_other_eap_id(this->ike_sa);
+
+		config = this->ike_sa->get_peer_cfg(this->ike_sa);
+		if (config && this->virtual_ip)
+		{
+			DBG1(DBG_IKE, "peer requested virtual IP %H", this->virtual_ip);
+			if (config->get_pool(config))
+			{
+				vip = hydra->attributes->acquire_address(hydra->attributes,
+							config->get_pool(config), id, this->virtual_ip);
+			}
+			if (vip == NULL)
+			{
+				DBG1(DBG_IKE, "no virtual IP found, sending %N",
+					 notify_type_names, INTERNAL_ADDRESS_FAILURE);
+				message->add_notify(message, FALSE, INTERNAL_ADDRESS_FAILURE,
+									chunk_empty);
+				return SUCCESS;
+			}
+			DBG1(DBG_IKE, "assigning virtual IP %H to peer", vip);
+			this->ike_sa->set_virtual_ip(this->ike_sa, FALSE, vip);
+
+			cp = cp_payload_create_type(CFG_REPLY);
+			cp->add_attribute(cp, build_vip(vip));
+		}
+
+		/* query registered providers for additional attributes to include */
+		enumerator = hydra->attributes->create_responder_enumerator(
+													hydra->attributes, id, vip);
+		while (enumerator->enumerate(enumerator, &type, &value))
+		{
+			if (!cp)
+			{
+				cp = cp_payload_create_type(CFG_REPLY);
+			}
+			DBG2(DBG_IKE, "building %N attribute",
+				 configuration_attribute_type_names, type);
+			cp->add_attribute(cp,
+						configuration_attribute_create_value(type, value));
+		}
+		enumerator->destroy(enumerator);
+
+		if (cp)
+		{
+			message->add_payload(message, (payload_t*)cp);
+		}
+		DESTROY_IF(vip);
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_config_t *this, message_t *message)
+{
+	if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
+	{	/* in last IKE_AUTH exchange */
+
+		process_payloads(this, message);
+
+		if (this->virtual_ip)
+		{
+			this->ike_sa->set_virtual_ip(this->ike_sa, TRUE, this->virtual_ip);
+		}
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_config_t *this)
+{
+	return IKE_CONFIG;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_config_t *this, ike_sa_t *ike_sa)
+{
+	DESTROY_IF(this->virtual_ip);
+
+	this->ike_sa = ike_sa;
+	this->virtual_ip = NULL;
+	this->requested->destroy_function(this->requested, free);
+	this->requested = linked_list_create();
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_config_t *this)
+{
+	DESTROY_IF(this->virtual_ip);
+	this->requested->destroy_function(this->requested, free);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_config_t *ike_config_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_config_t *this = malloc_thing(private_ike_config_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	this->initiator = initiator;
+	this->ike_sa = ike_sa;
+	this->virtual_ip = NULL;
+	this->requested = linked_list_create();
+
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/tasks/ike_config.h b/src/libcharon/sa/tasks/ike_config.h
new file mode 100644
index 000000000..8cef08697
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_config.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_config ike_config
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_CONFIG_H_
+#define IKE_CONFIG_H_
+
+typedef struct ike_config_t ike_config_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type IKE_CONFIG, sets up a virtual IP and other
+ * configurations for an IKE_SA.
+ */
+struct ike_config_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+};
+
+/**
+ * Create a new ike_config task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE for initiator
+ * @return				ike_config task to handle by the task_manager
+ */
+ike_config_t *ike_config_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_CONFIG_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_delete.c b/src/libcharon/sa/tasks/ike_delete.c
new file mode 100644
index 000000000..130948836
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_delete.c
@@ -0,0 +1,210 @@
+/*
+ * Copyright (C) 2006-2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_delete.h"
+
+#include <daemon.h>
+#include <encoding/payloads/delete_payload.h>
+
+
+typedef struct private_ike_delete_t private_ike_delete_t;
+
+/**
+ * Private members of a ike_delete_t task.
+ */
+struct private_ike_delete_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_delete_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * are we deleting a rekeyed SA?
+	 */
+	bool rekeyed;
+
+	/**
+	 * are we responding to a delete, but have initated our own?
+	 */
+	bool simultaneous;
+};
+
+/**
+ * Implementation of task_t.build for initiator
+ */
+static status_t build_i(private_ike_delete_t *this, message_t *message)
+{
+	delete_payload_t *delete_payload;
+
+	DBG0(DBG_IKE, "deleting IKE_SA %s[%d] between %H[%Y]...%H[%Y]",
+		 this->ike_sa->get_name(this->ike_sa),
+		 this->ike_sa->get_unique_id(this->ike_sa),
+		 this->ike_sa->get_my_host(this->ike_sa),
+		 this->ike_sa->get_my_id(this->ike_sa),
+		 this->ike_sa->get_other_host(this->ike_sa),
+		 this->ike_sa->get_other_id(this->ike_sa));
+
+	delete_payload = delete_payload_create(PROTO_IKE);
+	message->add_payload(message, (payload_t*)delete_payload);
+
+	if (this->ike_sa->get_state(this->ike_sa) == IKE_REKEYING)
+	{
+		this->rekeyed = TRUE;
+	}
+	this->ike_sa->set_state(this->ike_sa, IKE_DELETING);
+
+	DBG1(DBG_IKE, "sending DELETE for IKE_SA %s[%d]",
+		 this->ike_sa->get_name(this->ike_sa),
+		 this->ike_sa->get_unique_id(this->ike_sa));
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_delete_t *this, message_t *message)
+{
+	DBG0(DBG_IKE, "IKE_SA deleted");
+	if (!this->rekeyed)
+	{	/* invoke ike_down() hook if SA has not been rekeyed */
+		charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+	}
+	/* completed, delete IKE_SA by returning DESTROY_ME */
+	return DESTROY_ME;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_delete_t *this, message_t *message)
+{
+	/* we don't even scan the payloads, as the message wouldn't have
+	 * come so far without being correct */
+	DBG1(DBG_IKE, "received DELETE for IKE_SA %s[%d]",
+		 this->ike_sa->get_name(this->ike_sa),
+		 this->ike_sa->get_unique_id(this->ike_sa));
+	DBG0(DBG_IKE, "deleting IKE_SA %s[%d] between %H[%Y]...%H[%Y]",
+		 this->ike_sa->get_name(this->ike_sa),
+		 this->ike_sa->get_unique_id(this->ike_sa),
+		 this->ike_sa->get_my_host(this->ike_sa),
+		 this->ike_sa->get_my_id(this->ike_sa),
+		 this->ike_sa->get_other_host(this->ike_sa),
+		 this->ike_sa->get_other_id(this->ike_sa));
+
+	switch (this->ike_sa->get_state(this->ike_sa))
+	{
+		case IKE_ESTABLISHED:
+			this->ike_sa->set_state(this->ike_sa, IKE_DELETING);
+			this->ike_sa->reestablish(this->ike_sa);
+			return NEED_MORE;
+		case IKE_REKEYING:
+			this->rekeyed = TRUE;
+			break;
+		case IKE_DELETING:
+			this->simultaneous = TRUE;
+			break;
+		default:
+			break;
+	}
+	this->ike_sa->set_state(this->ike_sa, IKE_DELETING);
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_delete_t *this, message_t *message)
+{
+	DBG0(DBG_IKE, "IKE_SA deleted");
+
+	if (this->simultaneous)
+	{
+		/* wait for peer's response for our delete request, but set a timeout */
+		return SUCCESS;
+	}
+	if (!this->rekeyed)
+	{	/* invoke ike_down() hook if SA has not been rekeyed */
+		charon->bus->ike_updown(charon->bus, this->ike_sa, FALSE);
+	}
+	/* completed, delete IKE_SA by returning DESTROY_ME */
+	return DESTROY_ME;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_delete_t *this)
+{
+	return IKE_DELETE;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_delete_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+	this->simultaneous = FALSE;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_delete_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_delete_t *ike_delete_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_delete_t *this = malloc_thing(private_ike_delete_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+
+	this->ike_sa = ike_sa;
+	this->initiator = initiator;
+	this->rekeyed = FALSE;
+	this->simultaneous = FALSE;
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/ike_delete.h b/src/libcharon/sa/tasks/ike_delete.h
new file mode 100644
index 000000000..82782f393
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_delete.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_delete ike_delete
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_DELETE_H_
+#define IKE_DELETE_H_
+
+typedef struct ike_delete_t ike_delete_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type ike_delete, delete an IKE_SA.
+ */
+struct ike_delete_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+};
+
+/**
+ * Create a new ike_delete task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if we initiate the delete
+ * @return				ike_delete task to handle by the task_manager
+ */
+ike_delete_t *ike_delete_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_DELETE_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_dpd.c b/src/libcharon/sa/tasks/ike_dpd.c
new file mode 100644
index 000000000..4c6ba7662
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_dpd.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_dpd.h"
+
+#include <daemon.h>
+
+
+typedef struct private_ike_dpd_t private_ike_dpd_t;
+
+/**
+ * Private members of a ike_dpd_t task.
+ */
+struct private_ike_dpd_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_dpd_t public;
+};
+
+/**
+ * Implementation of task_t.build for initiator
+ * Implementation of task_t.process for responder
+ */
+static status_t return_need_more(private_ike_dpd_t *this, message_t *message)
+{
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ * Implementation of task_t.build for responder
+ */
+static status_t return_success(private_ike_dpd_t *this, message_t *message)
+{
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_dpd_t *this)
+{
+	return IKE_DPD;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_dpd_t *this, ike_sa_t *ike_sa)
+{
+
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_dpd_t *this)
+{
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_dpd_t *ike_dpd_create(bool initiator)
+{
+	private_ike_dpd_t *this = malloc_thing(private_ike_dpd_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))return_need_more;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))return_success;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))return_success;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))return_need_more;
+	}
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/ike_dpd.h b/src/libcharon/sa/tasks/ike_dpd.h
new file mode 100644
index 000000000..36388d15b
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_dpd.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_dpd ike_dpd
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_DPD_H_
+#define IKE_DPD_H_
+
+typedef struct ike_dpd_t ike_dpd_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type ike_dpd, detects dead peers.
+ *
+ * The DPD task actually does nothing, as a DPD has no associated payloads.
+ */
+struct ike_dpd_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+};
+
+/**
+ * Create a new ike_dpd task.
+ *
+ * @param initiator		TRUE if thask is the original initator
+ * @return				ike_dpd task to handle by the task_manager
+ */
+ike_dpd_t *ike_dpd_create(bool initiator);
+
+#endif /** IKE_DPD_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_init.c b/src/libcharon/sa/tasks/ike_init.c
new file mode 100644
index 000000000..5eb33b540
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_init.c
@@ -0,0 +1,600 @@
+/*
+ * Copyright (C) 2008-2009 Tobias Brunner
+ * Copyright (C) 2005-2008 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_init.h"
+
+#include <string.h>
+
+#include <daemon.h>
+#include <crypto/diffie_hellman.h>
+#include <encoding/payloads/sa_payload.h>
+#include <encoding/payloads/ke_payload.h>
+#include <encoding/payloads/nonce_payload.h>
+
+/** maximum retries to do with cookies/other dh groups */
+#define MAX_RETRIES 5
+
+typedef struct private_ike_init_t private_ike_init_t;
+
+/**
+ * Private members of a ike_init_t task.
+ */
+struct private_ike_init_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_init_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * IKE config to establish
+	 */
+	ike_cfg_t *config;
+
+	/**
+	 * diffie hellman group to use
+	 */
+	diffie_hellman_group_t dh_group;
+
+	/**
+	 * diffie hellman key exchange
+	 */
+	diffie_hellman_t *dh;
+
+	/**
+	 * Keymat derivation (from IKE_SA)
+	 */
+	keymat_t *keymat;
+
+	/**
+	 * nonce chosen by us
+	 */
+	chunk_t my_nonce;
+
+	/**
+	 * nonce chosen by peer
+	 */
+	chunk_t other_nonce;
+
+	/**
+	 * Negotiated proposal used for IKE_SA
+	 */
+	proposal_t *proposal;
+
+	/**
+	 * Old IKE_SA which gets rekeyed
+	 */
+	ike_sa_t *old_sa;
+
+	/**
+	 * cookie received from responder
+	 */
+	chunk_t cookie;
+
+	/**
+	 * retries done so far after failure (cookie or bad dh group)
+	 */
+	u_int retry;
+};
+
+/**
+ * build the payloads for the message
+ */
+static void build_payloads(private_ike_init_t *this, message_t *message)
+{
+	sa_payload_t *sa_payload;
+	ke_payload_t *ke_payload;
+	nonce_payload_t *nonce_payload;
+	linked_list_t *proposal_list;
+	ike_sa_id_t *id;
+	proposal_t *proposal;
+	iterator_t *iterator;
+
+	id = this->ike_sa->get_id(this->ike_sa);
+
+	this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
+
+	if (this->initiator)
+	{
+		proposal_list = this->config->get_proposals(this->config);
+		if (this->old_sa)
+		{
+			/* include SPI of new IKE_SA when we are rekeying */
+			iterator = proposal_list->create_iterator(proposal_list, TRUE);
+			while (iterator->iterate(iterator, (void**)&proposal))
+			{
+				proposal->set_spi(proposal, id->get_initiator_spi(id));
+			}
+			iterator->destroy(iterator);
+		}
+
+		sa_payload = sa_payload_create_from_proposal_list(proposal_list);
+		proposal_list->destroy_offset(proposal_list, offsetof(proposal_t, destroy));
+	}
+	else
+	{
+		if (this->old_sa)
+		{
+			/* include SPI of new IKE_SA when we are rekeying */
+			this->proposal->set_spi(this->proposal, id->get_responder_spi(id));
+		}
+		sa_payload = sa_payload_create_from_proposal(this->proposal);
+	}
+	message->add_payload(message, (payload_t*)sa_payload);
+
+	nonce_payload = nonce_payload_create();
+	nonce_payload->set_nonce(nonce_payload, this->my_nonce);
+	ke_payload = ke_payload_create_from_diffie_hellman(this->dh);
+
+	if (this->old_sa)
+	{	/* payload order differs if we are rekeying */
+		message->add_payload(message, (payload_t*)nonce_payload);
+		message->add_payload(message, (payload_t*)ke_payload);
+	}
+	else
+	{
+		message->add_payload(message, (payload_t*)ke_payload);
+		message->add_payload(message, (payload_t*)nonce_payload);
+	}
+}
+
+/**
+ * Read payloads from message
+ */
+static void process_payloads(private_ike_init_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		switch (payload->get_type(payload))
+		{
+			case SECURITY_ASSOCIATION:
+			{
+				sa_payload_t *sa_payload = (sa_payload_t*)payload;
+				linked_list_t *proposal_list;
+				bool private;
+
+				proposal_list = sa_payload->get_proposals(sa_payload);
+				private = this->ike_sa->supports_extension(this->ike_sa,
+														   EXT_STRONGSWAN);
+				this->proposal = this->config->select_proposal(this->config,
+														proposal_list, private);
+				proposal_list->destroy_offset(proposal_list,
+											  offsetof(proposal_t, destroy));
+				break;
+			}
+			case KEY_EXCHANGE:
+			{
+				ke_payload_t *ke_payload = (ke_payload_t*)payload;
+
+				this->dh_group = ke_payload->get_dh_group_number(ke_payload);
+				if (!this->initiator)
+				{
+					this->dh = this->keymat->create_dh(this->keymat,
+													   this->dh_group);
+				}
+				if (this->dh)
+				{
+					this->dh->set_other_public_value(this->dh,
+								ke_payload->get_key_exchange_data(ke_payload));
+				}
+				break;
+			}
+			case NONCE:
+			{
+				nonce_payload_t *nonce_payload = (nonce_payload_t*)payload;
+
+				this->other_nonce = nonce_payload->get_nonce(nonce_payload);
+				break;
+			}
+			default:
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t build_i(private_ike_init_t *this, message_t *message)
+{
+	rng_t *rng;
+
+	this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
+	DBG0(DBG_IKE, "initiating IKE_SA %s[%d] to %H",
+		 this->ike_sa->get_name(this->ike_sa),
+		 this->ike_sa->get_unique_id(this->ike_sa),
+		 this->ike_sa->get_other_host(this->ike_sa));
+	this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
+
+	if (this->retry >= MAX_RETRIES)
+	{
+		DBG1(DBG_IKE, "giving up after %d retries", MAX_RETRIES);
+		return FAILED;
+	}
+
+	/* if the DH group is set via use_dh_group(), we already have a DH object */
+	if (!this->dh)
+	{
+		this->dh_group = this->config->get_dh_group(this->config);
+		this->dh = this->keymat->create_dh(this->keymat, this->dh_group);
+		if (!this->dh)
+		{
+			DBG1(DBG_IKE, "configured DH group %N not supported",
+				diffie_hellman_group_names, this->dh_group);
+			return FAILED;
+		}
+	}
+
+	/* generate nonce only when we are trying the first time */
+	if (this->my_nonce.ptr == NULL)
+	{
+		rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
+		if (!rng)
+		{
+			DBG1(DBG_IKE, "error generating nonce");
+			return FAILED;
+		}
+		rng->allocate_bytes(rng, NONCE_SIZE, &this->my_nonce);
+		rng->destroy(rng);
+	}
+
+	if (this->cookie.ptr)
+	{
+		message->add_notify(message, FALSE, COOKIE, this->cookie);
+	}
+
+	build_payloads(this, message);
+
+#ifdef ME
+	{
+		chunk_t connect_id = this->ike_sa->get_connect_id(this->ike_sa);
+		if (connect_id.ptr)
+		{
+			message->add_notify(message, FALSE, ME_CONNECTID, connect_id);
+		}
+	}
+#endif /* ME */
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_init_t *this, message_t *message)
+{
+	rng_t *rng;
+
+	this->config = this->ike_sa->get_ike_cfg(this->ike_sa);
+	DBG0(DBG_IKE, "%H is initiating an IKE_SA", message->get_source(message));
+	this->ike_sa->set_state(this->ike_sa, IKE_CONNECTING);
+
+	rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
+	if (!rng)
+	{
+		DBG1(DBG_IKE, "error generating nonce");
+		return FAILED;
+	}
+	rng->allocate_bytes(rng, NONCE_SIZE, &this->my_nonce);
+	rng->destroy(rng);
+
+#ifdef ME
+	{
+		notify_payload_t *notify = message->get_notify(message, ME_CONNECTID);
+		if (notify)
+		{
+			chunk_t connect_id = notify->get_notification_data(notify);
+			DBG2(DBG_IKE, "received ME_CONNECTID %#B", &connect_id);
+			charon->connect_manager->stop_checks(charon->connect_manager,
+												 connect_id);
+		}
+	}
+#endif /* ME */
+
+	process_payloads(this, message);
+
+	return NEED_MORE;
+}
+
+/**
+ * Derive the keymat for the IKE_SA
+ */
+static bool derive_keys(private_ike_init_t *this,
+						chunk_t nonce_i, chunk_t nonce_r)
+{
+	keymat_t *old_keymat;
+	pseudo_random_function_t prf_alg = PRF_UNDEFINED;
+	chunk_t skd = chunk_empty;
+	ike_sa_id_t *id;
+
+	id = this->ike_sa->get_id(this->ike_sa);
+	if (this->old_sa)
+	{
+		/* rekeying: Include old SKd, use old PRF, apply SPI */
+		old_keymat = this->old_sa->get_keymat(this->old_sa);
+		prf_alg = old_keymat->get_skd(old_keymat, &skd);
+		if (this->initiator)
+		{
+			id->set_responder_spi(id, this->proposal->get_spi(this->proposal));
+		}
+		else
+		{
+			id->set_initiator_spi(id, this->proposal->get_spi(this->proposal));
+		}
+	}
+	if (!this->keymat->derive_ike_keys(this->keymat, this->proposal, this->dh,
+									   nonce_i, nonce_r, id, prf_alg, skd))
+	{
+		return FALSE;
+	}
+	charon->bus->ike_keys(charon->bus, this->ike_sa, this->dh,
+						  nonce_i, nonce_r, this->old_sa);
+	return TRUE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_init_t *this, message_t *message)
+{
+	/* check if we have everything we need */
+	if (this->proposal == NULL ||
+		this->other_nonce.len == 0 || this->my_nonce.len == 0)
+	{
+		DBG1(DBG_IKE, "received proposals inacceptable");
+		message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
+		return FAILED;
+	}
+	this->ike_sa->set_proposal(this->ike_sa, this->proposal);
+
+	if (this->dh == NULL ||
+		!this->proposal->has_dh_group(this->proposal, this->dh_group))
+	{
+		u_int16_t group;
+
+		if (this->proposal->get_algorithm(this->proposal, DIFFIE_HELLMAN_GROUP,
+										  &group, NULL))
+		{
+			DBG1(DBG_IKE, "DH group %N inacceptable, requesting %N",
+				 diffie_hellman_group_names, this->dh_group,
+				 diffie_hellman_group_names, group);
+			this->dh_group = group;
+			group = htons(group);
+			message->add_notify(message, FALSE, INVALID_KE_PAYLOAD,
+								chunk_from_thing(group));
+		}
+		else
+		{
+			DBG1(DBG_IKE, "no acceptable proposal found");
+		}
+		return FAILED;
+	}
+
+	if (!derive_keys(this, this->other_nonce, this->my_nonce))
+	{
+		DBG1(DBG_IKE, "key derivation failed");
+		message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
+		return FAILED;
+	}
+	build_payloads(this, message);
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_init_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+
+	/* check for erronous notifies */
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == NOTIFY)
+		{
+			notify_payload_t *notify = (notify_payload_t*)payload;
+			notify_type_t type = notify->get_notify_type(notify);
+
+			switch (type)
+			{
+				case INVALID_KE_PAYLOAD:
+				{
+					chunk_t data;
+					diffie_hellman_group_t bad_group;
+
+					bad_group = this->dh_group;
+					data = notify->get_notification_data(notify);
+					this->dh_group = ntohs(*((u_int16_t*)data.ptr));
+					DBG1(DBG_IKE, "peer didn't accept DH group %N, "
+						 "it requested %N", diffie_hellman_group_names,
+						 bad_group, diffie_hellman_group_names, this->dh_group);
+
+					if (this->old_sa == NULL)
+					{	/* reset the IKE_SA if we are not rekeying */
+						this->ike_sa->reset(this->ike_sa);
+					}
+
+					enumerator->destroy(enumerator);
+					this->retry++;
+					return NEED_MORE;
+				}
+				case NAT_DETECTION_SOURCE_IP:
+				case NAT_DETECTION_DESTINATION_IP:
+					/* skip, handled in ike_natd_t */
+					break;
+				case MULTIPLE_AUTH_SUPPORTED:
+					/* handled in ike_auth_t */
+					break;
+				case COOKIE:
+				{
+					chunk_free(&this->cookie);
+					this->cookie = chunk_clone(notify->get_notification_data(notify));
+					this->ike_sa->reset(this->ike_sa);
+					enumerator->destroy(enumerator);
+					DBG2(DBG_IKE, "received %N notify", notify_type_names, type);
+					this->retry++;
+					return NEED_MORE;
+				}
+				default:
+				{
+					if (type < 16383)
+					{
+						DBG1(DBG_IKE, "received %N notify error",
+							 notify_type_names, type);
+						enumerator->destroy(enumerator);
+						return FAILED;
+					}
+					DBG2(DBG_IKE, "received %N notify",
+						notify_type_names, type);
+					break;
+				}
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	process_payloads(this, message);
+
+	/* check if we have everything */
+	if (this->proposal == NULL ||
+		this->other_nonce.len == 0 || this->my_nonce.len == 0)
+	{
+		DBG1(DBG_IKE, "peers proposal selection invalid");
+		return FAILED;
+	}
+	this->ike_sa->set_proposal(this->ike_sa, this->proposal);
+
+	if (this->dh == NULL ||
+		!this->proposal->has_dh_group(this->proposal, this->dh_group))
+	{
+		DBG1(DBG_IKE, "peer DH group selection invalid");
+		return FAILED;
+	}
+
+	if (!derive_keys(this, this->my_nonce, this->other_nonce))
+	{
+		DBG1(DBG_IKE, "key derivation failed");
+		return FAILED;
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_init_t *this)
+{
+	return IKE_INIT;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static chunk_t get_lower_nonce(private_ike_init_t *this)
+{
+	if (memcmp(this->my_nonce.ptr, this->other_nonce.ptr,
+			   min(this->my_nonce.len, this->other_nonce.len)) < 0)
+	{
+		return this->my_nonce;
+	}
+	else
+	{
+		return this->other_nonce;
+	}
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_init_t *this, ike_sa_t *ike_sa)
+{
+	DESTROY_IF(this->proposal);
+	chunk_free(&this->other_nonce);
+
+	this->ike_sa = ike_sa;
+	this->proposal = NULL;
+	DESTROY_IF(this->dh);
+	this->dh = this->keymat->create_dh(this->keymat, this->dh_group);
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_init_t *this)
+{
+	DESTROY_IF(this->dh);
+	DESTROY_IF(this->proposal);
+	chunk_free(&this->my_nonce);
+	chunk_free(&this->other_nonce);
+	chunk_free(&this->cookie);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_init_t *ike_init_create(ike_sa_t *ike_sa, bool initiator, ike_sa_t *old_sa)
+{
+	private_ike_init_t *this = malloc_thing(private_ike_init_t);
+
+	this->public.get_lower_nonce = (chunk_t(*)(ike_init_t*))get_lower_nonce;
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+
+	this->ike_sa = ike_sa;
+	this->initiator = initiator;
+	this->dh_group = MODP_NONE;
+	this->dh = NULL;
+	this->keymat = ike_sa->get_keymat(ike_sa);
+	this->my_nonce = chunk_empty;
+	this->other_nonce = chunk_empty;
+	this->cookie = chunk_empty;
+	this->proposal = NULL;
+	this->config = NULL;
+	this->old_sa = old_sa;
+	this->retry = 0;
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/ike_init.h b/src/libcharon/sa/tasks/ike_init.h
new file mode 100644
index 000000000..7bd784cff
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_init.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_init ike_init
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_INIT_H_
+#define IKE_INIT_H_
+
+typedef struct ike_init_t ike_init_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type IKE_INIT, creates an IKE_SA without authentication.
+ *
+ * The authentication of is handle in the ike_auth task.
+ */
+struct ike_init_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+
+	/**
+	 * Get the lower of the two nonces, used for rekey collisions.
+	 *
+	 * @return			lower nonce
+	 */
+	chunk_t (*get_lower_nonce) (ike_init_t *this);
+};
+
+/**
+ * Create a new IKE_INIT task.
+ *
+ * @param ike_sa		IKE_SA this task works for (new one when rekeying)
+ * @param initiator		TRUE if thask is the original initator
+ * @param old_sa		old IKE_SA when we are rekeying
+ * @return				ike_init task to handle by the task_manager
+ */
+ike_init_t *ike_init_create(ike_sa_t *ike_sa, bool initiator, ike_sa_t *old_sa);
+
+#endif /** IKE_INIT_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_me.c b/src/libcharon/sa/tasks/ike_me.c
new file mode 100644
index 000000000..2d2847ae0
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_me.c
@@ -0,0 +1,856 @@
+/*
+ * Copyright (C) 2007-2008 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_me.h"
+
+#include <string.h>
+
+#include <daemon.h>
+#include <config/peer_cfg.h>
+#include <encoding/payloads/id_payload.h>
+#include <encoding/payloads/notify_payload.h>
+#include <encoding/payloads/endpoint_notify.h>
+#include <processing/jobs/mediation_job.h>
+
+#define ME_CONNECTID_LEN 4
+#define ME_CONNECTKEY_LEN 16
+
+typedef struct private_ike_me_t private_ike_me_t;
+
+/**
+ * Private members of a ike_me_t task.
+ */
+struct private_ike_me_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_me_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * Is this a mediation connection?
+	 */
+	bool mediation;
+
+	/**
+	 * Is this the response from another peer?
+	 */
+	bool response;
+
+	/**
+	 * Gathered endpoints
+	 */
+	linked_list_t *local_endpoints;
+
+	/**
+	 * Parsed endpoints
+	 */
+	linked_list_t *remote_endpoints;
+
+	/**
+	 * Did the peer request a callback?
+	 */
+	bool callback;
+
+	/**
+	 * Did the connect fail?
+	 */
+	bool failed;
+
+	/**
+	 * Was there anything wrong with the payloads?
+	 */
+	bool invalid_syntax;
+
+	/**
+	 * The requested peer
+	 */
+	identification_t *peer_id;
+	/**
+	 * Received ID used for connectivity checks
+	 */
+	chunk_t connect_id;
+
+	/**
+	 * Received key used for connectivity checks
+	 */
+	chunk_t connect_key;
+
+	/**
+	 * Peer config of the mediated connection
+	 */
+	peer_cfg_t *mediated_cfg;
+
+};
+
+/**
+ * Adds a list of endpoints as notifies to a given message
+ */
+static void add_endpoints_to_message(message_t *message, linked_list_t *endpoints)
+{
+	iterator_t *iterator;
+	endpoint_notify_t *endpoint;
+
+	iterator = endpoints->create_iterator(endpoints, TRUE);
+	while (iterator->iterate(iterator, (void**)&endpoint))
+	{
+		message->add_payload(message, (payload_t*)endpoint->build_notify(endpoint));
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Gathers endpoints and adds them to the current message
+ */
+static void gather_and_add_endpoints(private_ike_me_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	host_t *addr, *host;
+	u_int16_t port;
+
+	/* get the port that is used to communicate with the ms */
+	host = this->ike_sa->get_my_host(this->ike_sa);
+	port = host->get_port(host);
+
+	enumerator = charon->kernel_interface->create_address_enumerator(
+										charon->kernel_interface, FALSE, FALSE);
+	while (enumerator->enumerate(enumerator, (void**)&addr))
+	{
+		host = addr->clone(addr);
+		host->set_port(host, port);
+
+		this->local_endpoints->insert_last(this->local_endpoints,
+				endpoint_notify_create_from_host(HOST, host, NULL));
+
+		host->destroy(host);
+	}
+	enumerator->destroy(enumerator);
+
+	host = this->ike_sa->get_server_reflexive_host(this->ike_sa);
+	if (host)
+	{
+		this->local_endpoints->insert_last(this->local_endpoints,
+				endpoint_notify_create_from_host(SERVER_REFLEXIVE, host,
+						this->ike_sa->get_my_host(this->ike_sa)));
+	}
+
+	add_endpoints_to_message(message, this->local_endpoints);
+}
+
+/**
+ * read notifys from message and evaluate them
+ */
+static void process_payloads(private_ike_me_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) != NOTIFY)
+		{
+			continue;
+		}
+
+		notify_payload_t *notify = (notify_payload_t*)payload;
+
+		switch (notify->get_notify_type(notify))
+		{
+			case ME_CONNECT_FAILED:
+			{
+				DBG2(DBG_IKE, "received ME_CONNECT_FAILED notify");
+				this->failed = TRUE;
+				break;
+			}
+			case ME_MEDIATION:
+			{
+				DBG2(DBG_IKE, "received ME_MEDIATION notify");
+				this->mediation = TRUE;
+				break;
+			}
+			case ME_ENDPOINT:
+			{
+				endpoint_notify_t *endpoint;
+				endpoint = endpoint_notify_create_from_payload(notify);
+				if (!endpoint)
+				{
+					DBG1(DBG_IKE, "received invalid ME_ENDPOINT notify");
+					break;
+				}
+				DBG1(DBG_IKE, "received %N ME_ENDPOINT %#H",
+					 me_endpoint_type_names, endpoint->get_type(endpoint),
+					 endpoint->get_host(endpoint));
+
+				this->remote_endpoints->insert_last(this->remote_endpoints,
+													endpoint);
+				break;
+			}
+			case ME_CALLBACK:
+			{
+				DBG2(DBG_IKE, "received ME_CALLBACK notify");
+				this->callback = TRUE;
+				break;
+			}
+			case ME_CONNECTID:
+			{
+				chunk_free(&this->connect_id);
+				this->connect_id = chunk_clone(notify->get_notification_data(notify));
+				DBG2(DBG_IKE, "received ME_CONNECTID %#B", &this->connect_id);
+				break;
+			}
+			case ME_CONNECTKEY:
+			{
+				chunk_free(&this->connect_key);
+				this->connect_key = chunk_clone(notify->get_notification_data(notify));
+				DBG4(DBG_IKE, "received ME_CONNECTKEY %#B", &this->connect_key);
+				break;
+			}
+			case ME_RESPONSE:
+			{
+				DBG2(DBG_IKE, "received ME_RESPONSE notify");
+				this->response = TRUE;
+				break;
+			}
+			default:
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * Implementation of task_t.build for initiator
+ */
+static status_t build_i(private_ike_me_t *this, message_t *message)
+{
+	switch(message->get_exchange_type(message))
+	{
+		case IKE_SA_INIT:
+		{
+			peer_cfg_t *peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+			if (peer_cfg->is_mediation(peer_cfg))
+			{
+				DBG2(DBG_IKE, "adding ME_MEDIATION");
+				message->add_notify(message, FALSE, ME_MEDIATION, chunk_empty);
+			}
+			else
+			{
+				return SUCCESS;
+			}
+			break;
+		}
+		case IKE_AUTH:
+		{
+			if (this->ike_sa->has_condition(this->ike_sa, COND_NAT_HERE))
+			{
+				endpoint_notify_t *endpoint;
+				endpoint = endpoint_notify_create_from_host(SERVER_REFLEXIVE,
+															NULL, NULL);
+				message->add_payload(message, (payload_t*)endpoint->build_notify(endpoint));
+				endpoint->destroy(endpoint);
+			}
+			break;
+		}
+		case ME_CONNECT:
+		{
+			rng_t *rng;
+			id_payload_t *id_payload;
+			id_payload = id_payload_create_from_identification(ID_PEER,
+															   this->peer_id);
+			message->add_payload(message, (payload_t*)id_payload);
+
+			rng = lib->crypto->create_rng(lib->crypto, RNG_STRONG);
+			if (!rng)
+			{
+				DBG1(DBG_IKE, "unable to generate connect ID for ME_CONNECT");
+				return FAILED;
+			}
+			if (!this->response)
+			{
+				/* only the initiator creates a connect ID. the responder
+				 * returns the connect ID that it received from the initiator */
+				rng->allocate_bytes(rng, ME_CONNECTID_LEN, &this->connect_id);
+			}
+			rng->allocate_bytes(rng, ME_CONNECTKEY_LEN, &this->connect_key);
+			rng->destroy(rng);
+
+			message->add_notify(message, FALSE, ME_CONNECTID, this->connect_id);
+			message->add_notify(message, FALSE, ME_CONNECTKEY, this->connect_key);
+
+			if (this->response)
+			{
+				message->add_notify(message, FALSE, ME_RESPONSE, chunk_empty);
+			}
+			else
+			{
+				/* FIXME: should we make this configurable? */
+				message->add_notify(message, FALSE, ME_CALLBACK, chunk_empty);
+			}
+
+			gather_and_add_endpoints(this, message);
+
+			break;
+		}
+		default:
+			break;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_me_t *this, message_t *message)
+{
+	switch(message->get_exchange_type(message))
+	{
+		case ME_CONNECT:
+		{
+			id_payload_t *id_payload;
+			id_payload = (id_payload_t*)message->get_payload(message, ID_PEER);
+			if (!id_payload)
+			{
+				DBG1(DBG_IKE, "received ME_CONNECT without ID_PEER payload"
+					 ", aborting");
+				break;
+			}
+			this->peer_id = id_payload->get_identification(id_payload);
+
+			process_payloads(this, message);
+
+			if (this->callback)
+			{
+				DBG1(DBG_IKE, "received ME_CALLBACK for '%Y'", this->peer_id);
+				break;
+			}
+
+			if (!this->connect_id.ptr)
+			{
+				DBG1(DBG_IKE, "received ME_CONNECT without ME_CONNECTID notify"
+					 ", aborting");
+				this->invalid_syntax = TRUE;
+				break;
+			}
+
+			if (!this->connect_key.ptr)
+			{
+				DBG1(DBG_IKE, "received ME_CONNECT without ME_CONNECTKEY "
+					 "notify, aborting");
+				this->invalid_syntax = TRUE;
+				break;
+			}
+
+			if (!this->remote_endpoints->get_count(this->remote_endpoints))
+			{
+				DBG1(DBG_IKE, "received ME_CONNECT without any ME_ENDPOINT "
+					 "payloads, aborting");
+				this->invalid_syntax = TRUE;
+				break;
+			}
+
+			DBG1(DBG_IKE, "received ME_CONNECT");
+			break;
+		}
+		default:
+			break;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_me_t *this, message_t *message)
+{
+	switch(message->get_exchange_type(message))
+	{
+		case ME_CONNECT:
+		{
+			if (this->invalid_syntax)
+			{
+				message->add_notify(message, TRUE, INVALID_SYNTAX, chunk_empty);
+				break;
+			}
+
+			if (this->callback)
+			{
+				/* we got a callback from the mediation server, initiate the
+				 * queued mediated connecction */
+				charon->connect_manager->check_and_initiate(
+						charon->connect_manager,
+						this->ike_sa->get_id(this->ike_sa),
+						this->ike_sa->get_my_id(this->ike_sa), this->peer_id);
+				return SUCCESS;
+			}
+
+			if (this->response)
+			{
+				/* FIXME: handle result of set_responder_data
+				 * as initiator, upon receiving a response from another peer,
+				 * update the checklist and start sending checks */
+				charon->connect_manager->set_responder_data(
+						charon->connect_manager,
+						this->connect_id, this->connect_key,
+						this->remote_endpoints);
+			}
+			else
+			{
+				/* FIXME: handle result of set_initiator_data
+				 * as responder, create a checklist with the initiator's data */
+				charon->connect_manager->set_initiator_data(
+						charon->connect_manager,
+						this->peer_id, this->ike_sa->get_my_id(this->ike_sa),
+						this->connect_id, this->connect_key,
+						this->remote_endpoints, FALSE);
+				if (this->ike_sa->respond(this->ike_sa, this->peer_id,
+										  this->connect_id) != SUCCESS)
+				{
+					return FAILED;
+				}
+			}
+			break;
+		}
+		default:
+			break;
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_me_t *this, message_t *message)
+{
+	switch(message->get_exchange_type(message))
+	{
+		case IKE_SA_INIT:
+		{
+			process_payloads(this, message);
+			if (!this->mediation)
+			{
+				DBG1(DBG_IKE, "server did not return a ME_MEDIATION, aborting");
+				return FAILED;
+			}
+			return NEED_MORE;
+		}
+		case IKE_AUTH:
+		{
+			process_payloads(this, message);
+			/* FIXME: we should update the server reflexive endpoint somehow,
+			 * if mobike notices a change */
+			endpoint_notify_t *reflexive;
+			if (this->remote_endpoints->get_first(this->remote_endpoints,
+											(void**)&reflexive) == SUCCESS &&
+				reflexive->get_type(reflexive) == SERVER_REFLEXIVE)
+			{	/* FIXME: should we accept this endpoint even if we did not send
+				 * a request? */
+				host_t *endpoint = reflexive->get_host(reflexive);
+				endpoint = endpoint->clone(endpoint);
+				this->ike_sa->set_server_reflexive_host(this->ike_sa, endpoint);
+			}
+			break;
+		}
+		case ME_CONNECT:
+		{
+			process_payloads(this, message);
+
+			if (this->failed)
+			{
+				DBG1(DBG_IKE, "peer '%Y' is not online", this->peer_id);
+				/* FIXME: notify the mediated connection (job?) */
+			}
+			else
+			{
+				if (this->response)
+				{
+					/* FIXME: handle result of set_responder_data. */
+					/* as responder, we update the checklist and start sending
+					 * checks */
+					charon->connect_manager->set_responder_data(
+							charon->connect_manager, this->connect_id,
+							this->connect_key, this->local_endpoints);
+				}
+				else
+				{
+					/* FIXME: handle result of set_initiator_data */
+					/* as initiator, we create a checklist and set the
+					 * initiator's data */
+					charon->connect_manager->set_initiator_data(
+							charon->connect_manager,
+							this->ike_sa->get_my_id(this->ike_sa),
+							this->peer_id, this->connect_id, this->connect_key,
+							this->local_endpoints, TRUE);
+					/* FIXME: also start a timer for the whole transaction
+					 * (maybe within the connect_manager?) */
+				}
+			}
+			break;
+		}
+		default:
+			break;
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.build for initiator (mediation server)
+ */
+static status_t build_i_ms(private_ike_me_t *this, message_t *message)
+{
+	switch(message->get_exchange_type(message))
+	{
+		case ME_CONNECT:
+		{
+			id_payload_t *id_payload;
+			id_payload = id_payload_create_from_identification(ID_PEER,
+															   this->peer_id);
+			message->add_payload(message, (payload_t*)id_payload);
+
+			if (this->callback)
+			{
+				message->add_notify(message, FALSE, ME_CALLBACK, chunk_empty);
+			}
+			else
+			{
+				if (this->response)
+				{
+					message->add_notify(message, FALSE, ME_RESPONSE,
+										chunk_empty);
+				}
+				message->add_notify(message, FALSE, ME_CONNECTID,
+									this->connect_id);
+				message->add_notify(message, FALSE, ME_CONNECTKEY,
+									this->connect_key);
+				add_endpoints_to_message(message, this->remote_endpoints);
+			}
+			break;
+		}
+		default:
+			break;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder (mediation server)
+ */
+static status_t process_r_ms(private_ike_me_t *this, message_t *message)
+{
+	switch(message->get_exchange_type(message))
+	{
+		case IKE_SA_INIT:
+		{
+			/* FIXME: we should check for SA* and TS* payloads. if there are
+			 * any, send NO_ADDITIONAL_SAS back and delete this SA */
+			process_payloads(this, message);
+			return this->mediation ? NEED_MORE : SUCCESS;
+		}
+		case IKE_AUTH:
+		{
+			/* FIXME: we should check whether the current peer_config is
+			 * configured as mediation connection */
+			process_payloads(this, message);
+			break;
+		}
+		case CREATE_CHILD_SA:
+		{
+			/* FIXME: if this is not to rekey the IKE SA we have to return a
+			 * NO_ADDITIONAL_SAS and then delete the SA */
+			break;
+		}
+		case ME_CONNECT:
+		{
+			id_payload_t *id_payload;
+			id_payload = (id_payload_t*)message->get_payload(message, ID_PEER);
+			if (!id_payload)
+			{
+				DBG1(DBG_IKE, "received ME_CONNECT without ID_PEER payload"
+					 ", aborting");
+				this->invalid_syntax = TRUE;
+				break;
+			}
+			this->peer_id = id_payload->get_identification(id_payload);
+
+			process_payloads(this, message);
+
+			if (!this->connect_id.ptr)
+			{
+				DBG1(DBG_IKE, "received ME_CONNECT without ME_CONNECTID notify"
+					 ", aborting");
+				this->invalid_syntax = TRUE;
+				break;
+			}
+
+			if (!this->connect_key.ptr)
+			{
+				DBG1(DBG_IKE, "received ME_CONNECT without ME_CONNECTKEY notify"
+					 ", aborting");
+				this->invalid_syntax = TRUE;
+				break;
+			}
+
+			if (!this->remote_endpoints->get_count(this->remote_endpoints))
+			{
+				DBG1(DBG_IKE, "received ME_CONNECT without any ME_ENDPOINT "
+					 "payloads, aborting");
+				this->invalid_syntax = TRUE;
+				break;
+			}
+			break;
+		}
+		default:
+			break;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder (mediation server)
+ */
+static status_t build_r_ms(private_ike_me_t *this, message_t *message)
+{
+	switch(message->get_exchange_type(message))
+	{
+		case IKE_SA_INIT:
+		{
+			message->add_notify(message, FALSE, ME_MEDIATION, chunk_empty);
+			return NEED_MORE;
+		}
+		case IKE_AUTH:
+		{
+			endpoint_notify_t *endpoint;
+			if (this->remote_endpoints->get_first(this->remote_endpoints,
+											(void**)&endpoint) == SUCCESS &&
+				endpoint->get_type(endpoint) == SERVER_REFLEXIVE)
+			{
+				host_t *host = this->ike_sa->get_other_host(this->ike_sa);
+				DBG2(DBG_IKE, "received request for a server reflexive "
+					 "endpoint sending: %#H", host);
+				endpoint = endpoint_notify_create_from_host(SERVER_REFLEXIVE,
+															host, NULL);
+				message->add_payload(message, (payload_t*)endpoint->build_notify(endpoint));
+				endpoint->destroy(endpoint);
+			}
+			this->ike_sa->act_as_mediation_server(this->ike_sa);
+			break;
+		}
+		case ME_CONNECT:
+		{
+			if (this->invalid_syntax)
+			{
+				message->add_notify(message, TRUE, INVALID_SYNTAX, chunk_empty);
+				break;
+			}
+
+			ike_sa_id_t *peer_sa;
+			if (this->callback)
+			{
+				peer_sa = charon->mediation_manager->check_and_register(
+									charon->mediation_manager, this->peer_id,
+									this->ike_sa->get_other_id(this->ike_sa));
+			}
+			else
+			{
+				peer_sa = charon->mediation_manager->check(
+									charon->mediation_manager, this->peer_id);
+			}
+
+			if (!peer_sa)
+			{
+				/* the peer is not online */
+				message->add_notify(message, TRUE, ME_CONNECT_FAILED,
+									chunk_empty);
+				break;
+			}
+
+			job_t *job = (job_t*)mediation_job_create(this->peer_id,
+					this->ike_sa->get_other_id(this->ike_sa), this->connect_id,
+					this->connect_key, this->remote_endpoints, this->response);
+			charon->processor->queue_job(charon->processor, job);
+			break;
+		}
+		default:
+			break;
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for initiator (mediation server)
+ */
+static status_t process_i_ms(private_ike_me_t *this, message_t *message)
+{
+	/* FIXME: theoretically we should be prepared to receive a ME_CONNECT_FAILED
+	 * here if the responding peer is not able to proceed. in this case we shall
+	 * notify the initiating peer with a ME_CONNECT request containing only a
+	 * ME_CONNECT_FAILED */
+	return SUCCESS;
+}
+
+/**
+ * Implementation of ike_me.connect
+ */
+static void me_connect(private_ike_me_t *this, identification_t *peer_id)
+{
+	this->peer_id = peer_id->clone(peer_id);
+}
+
+/**
+ * Implementation of ike_me.respond
+ */
+static void me_respond(private_ike_me_t *this, identification_t *peer_id,
+					   chunk_t connect_id)
+{
+	this->peer_id = peer_id->clone(peer_id);
+	this->connect_id = chunk_clone(connect_id);
+	this->response = TRUE;
+}
+
+/**
+ * Implementation of ike_me.callback
+ */
+static void me_callback(private_ike_me_t *this, identification_t *peer_id)
+{
+	this->peer_id = peer_id->clone(peer_id);
+	this->callback = TRUE;
+}
+
+/**
+ * Implementation of ike_me.relay
+ */
+static void relay(private_ike_me_t *this, identification_t *requester,
+				  chunk_t connect_id, chunk_t connect_key,
+				  linked_list_t *endpoints, bool response)
+{
+	this->peer_id = requester->clone(requester);
+	this->connect_id = chunk_clone(connect_id);
+	this->connect_key = chunk_clone(connect_key);
+
+	this->remote_endpoints->destroy_offset(this->remote_endpoints,
+										offsetof(endpoint_notify_t, destroy));
+	this->remote_endpoints = endpoints->clone_offset(endpoints,
+										offsetof(endpoint_notify_t, clone));
+
+	this->response = response;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_me_t *this)
+{
+	return IKE_ME;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_me_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_me_t *this)
+{
+	DESTROY_IF(this->peer_id);
+
+	chunk_free(&this->connect_id);
+	chunk_free(&this->connect_key);
+
+	this->local_endpoints->destroy_offset(this->local_endpoints,
+										offsetof(endpoint_notify_t, destroy));
+	this->remote_endpoints->destroy_offset(this->remote_endpoints,
+										offsetof(endpoint_notify_t, destroy));
+
+	DESTROY_IF(this->mediated_cfg);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_me_t *ike_me_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_me_t *this = malloc_thing(private_ike_me_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	if (ike_sa->has_condition(ike_sa, COND_ORIGINAL_INITIATOR))
+	{
+		if (initiator)
+		{
+			this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+			this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+		}
+		else
+		{
+			this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+			this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+		}
+	}
+	else
+	{
+		/* mediation server */
+		if (initiator)
+		{
+			this->public.task.build = (status_t(*)(task_t*,message_t*))build_i_ms;
+			this->public.task.process = (status_t(*)(task_t*,message_t*))process_i_ms;
+		}
+		else
+		{
+			this->public.task.build = (status_t(*)(task_t*,message_t*))build_r_ms;
+			this->public.task.process = (status_t(*)(task_t*,message_t*))process_r_ms;
+		}
+	}
+
+	this->public.connect = (void(*)(ike_me_t*,identification_t*))me_connect;
+	this->public.respond = (void(*)(ike_me_t*,identification_t*,chunk_t))me_respond;
+	this->public.callback = (void(*)(ike_me_t*,identification_t*))me_callback;
+	this->public.relay = (void(*)(ike_me_t*,identification_t*,chunk_t,chunk_t,linked_list_t*,bool))relay;
+
+	this->ike_sa = ike_sa;
+	this->initiator = initiator;
+
+	this->peer_id = NULL;
+	this->connect_id = chunk_empty;
+	this->connect_key = chunk_empty;
+	this->local_endpoints = linked_list_create();
+	this->remote_endpoints = linked_list_create();
+	this->mediation = FALSE;
+	this->response = FALSE;
+	this->callback = FALSE;
+	this->failed = FALSE;
+	this->invalid_syntax = FALSE;
+
+	this->mediated_cfg = NULL;
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/ike_me.h b/src/libcharon/sa/tasks/ike_me.h
new file mode 100644
index 000000000..31285a426
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_me.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2007 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_me ike_me
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_ME_H_
+#define IKE_ME_H_
+
+typedef struct ike_me_t ike_me_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type IKE_ME, detects and handles IKE-ME extensions.
+ *
+ * This tasks handles the ME_MEDIATION Notify exchange to setup a mediation
+ * connection, allows to initiate mediated connections using ME_CONNECT
+ * exchanges and to request reflexive addresses from the mediation server using
+ * ME_ENDPOINT notifies.
+ *
+ * @note This task has to be activated before the IKE_AUTH task, because that
+ * task generates the IKE_SA_INIT message so that no more payloads can be added
+ * to it afterwards.
+ */
+struct ike_me_t {
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+
+	/**
+	 * Initiates a connection with another peer (i.e. sends a ME_CONNECT
+	 * to the mediation server)
+	 *
+	 * @param peer_id			ID of the other peer (gets cloned)
+	 */
+	void (*connect)(ike_me_t *this, identification_t *peer_id);
+
+	/**
+	 * Responds to a ME_CONNECT from another peer (i.e. sends a ME_CONNECT
+	 * to the mediation server)
+	 *
+	 * Data gets cloned.
+	 *
+	 * @param peer_id			ID of the other peer
+	 * @param connect_id		the connect ID as provided by the initiator
+	 */
+	void (*respond)(ike_me_t *this, identification_t *peer_id,
+					chunk_t connect_id);
+
+	/**
+	 * Sends a ME_CALLBACK to a peer that previously requested some other peer.
+	 *
+	 * @param peer_id			ID of the other peer (gets cloned)
+	 */
+	void (*callback)(ike_me_t *this, identification_t *peer_id);
+
+	/**
+	 * Relays data to another peer (i.e. sends a ME_CONNECT to the peer)
+	 *
+	 * Data gets cloned.
+	 *
+	 * @param requester			ID of the requesting peer
+	 * @param connect_id		content of the ME_CONNECTID notify
+	 * @param connect_key		content of the ME_CONNECTKEY notify
+	 * @param endpoints			endpoints
+	 * @param response			TRUE if this is a response
+	 */
+	void (*relay)(ike_me_t *this, identification_t *requester,
+				  chunk_t connect_id, chunk_t connect_key,
+				  linked_list_t *endpoints, bool response);
+};
+
+/**
+ * Create a new ike_me task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if task is initiated by us
+ * @return				ike_me task to be handled by the task_manager
+ */
+ike_me_t *ike_me_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_ME_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_mobike.c b/src/libcharon/sa/tasks/ike_mobike.c
new file mode 100644
index 000000000..a62886f02
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_mobike.c
@@ -0,0 +1,659 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_mobike.h"
+
+#include <string.h>
+
+#include <daemon.h>
+#include <sa/tasks/ike_natd.h>
+#include <encoding/payloads/notify_payload.h>
+
+#define COOKIE2_SIZE 16
+#define MAX_ADDITIONAL_ADDRS 8
+
+typedef struct private_ike_mobike_t private_ike_mobike_t;
+
+/**
+ * Private members of a ike_mobike_t task.
+ */
+struct private_ike_mobike_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_mobike_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * cookie2 value to verify new addresses
+	 */
+	chunk_t cookie2;
+
+	/**
+	 * NAT discovery reusing the IKE_NATD task
+	 */
+	ike_natd_t *natd;
+
+	/**
+	 * use task to update addresses
+	 */
+	bool update;
+
+	/**
+	 * do routability check
+	 */
+	bool check;
+
+	/**
+	 * include address list update
+	 */
+	bool address;
+};
+
+/**
+ * flush the IKE_SAs list of additional addresses
+ */
+static void flush_additional_addresses(private_ike_mobike_t *this)
+{
+	iterator_t *iterator;
+	host_t *host;
+
+	iterator = this->ike_sa->create_additional_address_iterator(this->ike_sa);
+	while (iterator->iterate(iterator, (void**)&host))
+	{
+		iterator->remove(iterator);
+		host->destroy(host);
+	}
+	iterator->destroy(iterator);
+}
+
+
+/**
+ * read notifys from message and evaluate them
+ */
+static void process_payloads(private_ike_mobike_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	bool first = TRUE;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		int family = AF_INET;
+		notify_payload_t *notify;
+		chunk_t data;
+		host_t *host;
+
+		if (payload->get_type(payload) != NOTIFY)
+		{
+			continue;
+		}
+		notify = (notify_payload_t*)payload;
+		switch (notify->get_notify_type(notify))
+		{
+			case MOBIKE_SUPPORTED:
+			{
+				peer_cfg_t *peer_cfg;
+
+				peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+				if (!this->initiator &&
+					peer_cfg && !peer_cfg->use_mobike(peer_cfg))
+				{
+					DBG1(DBG_IKE, "peer supports MOBIKE, but disabled in config");
+				}
+				else
+				{
+					DBG1(DBG_IKE, "peer supports MOBIKE");
+					this->ike_sa->enable_extension(this->ike_sa, EXT_MOBIKE);
+				}
+				break;
+			}
+			case COOKIE2:
+			{
+				chunk_free(&this->cookie2);
+				this->cookie2 = chunk_clone(notify->get_notification_data(notify));
+				break;
+			}
+			case ADDITIONAL_IP6_ADDRESS:
+			{
+				family = AF_INET6;
+				/* fall through */
+			}
+			case ADDITIONAL_IP4_ADDRESS:
+			{
+				if (first)
+				{	/* an ADDITIONAL_*_ADDRESS means replace, so flush once */
+					flush_additional_addresses(this);
+					first = FALSE;
+				}
+				data = notify->get_notification_data(notify);
+				host = host_create_from_chunk(family, data, 0);
+				DBG2(DBG_IKE, "got additional MOBIKE peer address: %H", host);
+				this->ike_sa->add_additional_address(this->ike_sa, host);
+				break;
+			}
+			case UPDATE_SA_ADDRESSES:
+			{
+				this->update = TRUE;
+				break;
+			}
+			case NO_ADDITIONAL_ADDRESSES:
+			{
+				flush_additional_addresses(this);
+				break;
+			}
+			case NAT_DETECTION_SOURCE_IP:
+			case NAT_DETECTION_DESTINATION_IP:
+			{
+				/* NAT check in this MOBIKE exchange, create subtask for it */
+				if (this->natd == NULL)
+				{
+					this->natd = ike_natd_create(this->ike_sa, this->initiator);
+				}
+				break;
+			}
+			default:
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * Add ADDITIONAL_*_ADDRESS notifys depending on our address list
+ */
+static void build_address_list(private_ike_mobike_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	host_t *host, *me;
+	notify_type_t type;
+	int added = 0;
+
+	me = this->ike_sa->get_my_host(this->ike_sa);
+	enumerator = charon->kernel_interface->create_address_enumerator(
+										charon->kernel_interface, FALSE, FALSE);
+	while (enumerator->enumerate(enumerator, (void**)&host))
+	{
+		if (me->ip_equals(me, host))
+		{	/* "ADDITIONAL" means do not include IKE_SAs host */
+			continue;
+		}
+		switch (host->get_family(host))
+		{
+			case AF_INET:
+				type = ADDITIONAL_IP4_ADDRESS;
+				break;
+			case AF_INET6:
+				type = ADDITIONAL_IP6_ADDRESS;
+				break;
+			default:
+				continue;
+		}
+		message->add_notify(message, FALSE, type, host->get_address(host));
+		if (++added >= MAX_ADDITIONAL_ADDRS)
+		{	/* limit number of notifys, some implementations do not like too
+			 * many of them (f.e. strongSwan ;-) */
+			break;
+		}
+	}
+	if (!added)
+	{
+		message->add_notify(message, FALSE, NO_ADDITIONAL_ADDRESSES, chunk_empty);
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * build a cookie and add it to the message
+ */
+static void build_cookie(private_ike_mobike_t *this, message_t *message)
+{
+	rng_t *rng;
+
+	chunk_free(&this->cookie2);
+	rng = lib->crypto->create_rng(lib->crypto, RNG_STRONG);
+	if (rng)
+	{
+		rng->allocate_bytes(rng, COOKIE2_SIZE, &this->cookie2);
+		rng->destroy(rng);
+		message->add_notify(message, FALSE, COOKIE2, this->cookie2);
+	}
+}
+
+/**
+ * update addresses of associated CHILD_SAs
+ */
+static void update_children(private_ike_mobike_t *this)
+{
+	iterator_t *iterator;
+	child_sa_t *child_sa;
+
+	iterator = this->ike_sa->create_child_sa_iterator(this->ike_sa);
+	while (iterator->iterate(iterator, (void**)&child_sa))
+	{
+		if (child_sa->update(child_sa,
+				this->ike_sa->get_my_host(this->ike_sa),
+				this->ike_sa->get_other_host(this->ike_sa),
+				this->ike_sa->get_virtual_ip(this->ike_sa, TRUE),
+				this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY)) == NOT_SUPPORTED)
+		{
+			this->ike_sa->rekey_child_sa(this->ike_sa,
+					child_sa->get_protocol(child_sa),
+					child_sa->get_spi(child_sa, TRUE));
+		}
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Apply port of old address if it equals new, port otherwise
+ */
+static void apply_port(private_ike_mobike_t *this, host_t *host, host_t *old,
+					   u_int16_t port)
+{
+	if (host->ip_equals(host, old))
+	{
+		host->set_port(host, old->get_port(old));
+	}
+	else
+	{
+		if (port == IKEV2_UDP_PORT)
+		{
+			host->set_port(host, IKEV2_NATT_PORT);
+		}
+		else
+		{
+			host->set_port(host, port);
+		}
+	}
+}
+
+/**
+ * Implementation of ike_mobike_t.transmit
+ */
+static void transmit(private_ike_mobike_t *this, packet_t *packet)
+{
+	host_t *me, *other, *me_old, *other_old;
+	iterator_t *iterator;
+	ike_cfg_t *ike_cfg;
+	packet_t *copy;
+
+	if (!this->check)
+	{
+		return;
+	}
+
+	me_old = this->ike_sa->get_my_host(this->ike_sa);
+	other_old = this->ike_sa->get_other_host(this->ike_sa);
+	ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
+
+	me = charon->kernel_interface->get_source_addr(
+									charon->kernel_interface, other_old, NULL);
+	if (me)
+	{
+		apply_port(this, me, me_old, ike_cfg->get_my_port(ike_cfg));
+		DBG1(DBG_IKE, "checking original path %#H - %#H", me, other_old);
+		copy = packet->clone(packet);
+		copy->set_source(copy, me);
+		charon->sender->send(charon->sender, copy);
+	}
+
+	iterator = this->ike_sa->create_additional_address_iterator(this->ike_sa);
+	while (iterator->iterate(iterator, (void**)&other))
+	{
+		me = charon->kernel_interface->get_source_addr(
+										charon->kernel_interface, other, NULL);
+		if (me)
+		{
+			if (me->get_family(me) != other->get_family(other))
+			{
+				me->destroy(me);
+				continue;
+			}
+			/* reuse port for an active address, 4500 otherwise */
+			apply_port(this, me, me_old, ike_cfg->get_my_port(ike_cfg));
+			other = other->clone(other);
+			apply_port(this, other, other_old, ike_cfg->get_other_port(ike_cfg));
+			DBG1(DBG_IKE, "checking path %#H - %#H", me, other);
+			copy = packet->clone(packet);
+			copy->set_source(copy, me);
+			copy->set_destination(copy, other);
+			charon->sender->send(charon->sender, copy);
+		}
+	}
+	iterator->destroy(iterator);
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t build_i(private_ike_mobike_t *this, message_t *message)
+{
+	if (message->get_message_id(message) == 1)
+	{	/* only in first IKE_AUTH */
+		message->add_notify(message, FALSE, MOBIKE_SUPPORTED, chunk_empty);
+		build_address_list(this, message);
+	}
+	else if (message->get_exchange_type(message) == INFORMATIONAL)
+	{
+		host_t *old, *new;
+
+		/* we check if the existing address is still valid */
+		old = message->get_source(message);
+		new = charon->kernel_interface->get_source_addr(charon->kernel_interface,
+										message->get_destination(message), old);
+		if (new)
+		{
+			if (!new->ip_equals(new, old))
+			{
+				new->set_port(new, old->get_port(old));
+				message->set_source(message, new);
+			}
+			else
+			{
+				new->destroy(new);
+			}
+		}
+		if (this->update)
+		{
+			message->add_notify(message, FALSE, UPDATE_SA_ADDRESSES, chunk_empty);
+			build_cookie(this, message);
+			update_children(this);
+		}
+		if (this->address)
+		{
+			build_address_list(this, message);
+		}
+		if (this->natd)
+		{
+			this->natd->task.build(&this->natd->task, message);
+		}
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_mobike_t *this, message_t *message)
+{
+	if (message->get_message_id(message) == 1)
+	{	/* only first IKE_AUTH */
+		process_payloads(this, message);
+	}
+	else if (message->get_exchange_type(message) == INFORMATIONAL)
+	{
+		process_payloads(this, message);
+		if (this->update)
+		{
+			host_t *me, *other;
+
+			me = message->get_destination(message);
+			other = message->get_source(message);
+			this->ike_sa->set_my_host(this->ike_sa, me->clone(me));
+			this->ike_sa->set_other_host(this->ike_sa, other->clone(other));
+		}
+
+		if (this->natd)
+		{
+			this->natd->task.process(&this->natd->task, message);
+		}
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_mobike_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_AUTH &&
+		this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
+	{
+		if (this->ike_sa->supports_extension(this->ike_sa, EXT_MOBIKE))
+		{
+			message->add_notify(message, FALSE, MOBIKE_SUPPORTED, chunk_empty);
+			build_address_list(this, message);
+		}
+		return SUCCESS;
+	}
+	else if (message->get_exchange_type(message) == INFORMATIONAL)
+	{
+		if (this->natd)
+		{
+			this->natd->task.build(&this->natd->task, message);
+		}
+		if (this->cookie2.ptr)
+		{
+			message->add_notify(message, FALSE, COOKIE2, this->cookie2);
+			chunk_free(&this->cookie2);
+		}
+		if (this->update)
+		{
+			update_children(this);
+		}
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_mobike_t *this, message_t *message)
+{
+	if (message->get_exchange_type(message) == IKE_AUTH &&
+		this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
+	{
+		process_payloads(this, message);
+		return SUCCESS;
+	}
+	else if (message->get_exchange_type(message) == INFORMATIONAL)
+	{
+		u_int32_t updates = this->ike_sa->get_pending_updates(this->ike_sa) - 1;
+		this->ike_sa->set_pending_updates(this->ike_sa, updates);
+		if (updates > 0)
+		{
+			/* newer update queued, ignore this one */
+			return SUCCESS;
+		}
+		if (this->cookie2.ptr)
+		{	/* check cookie if we included one */
+			chunk_t cookie2;
+
+			cookie2 = this->cookie2;
+			this->cookie2 = chunk_empty;
+			process_payloads(this, message);
+			if (!chunk_equals(cookie2, this->cookie2))
+			{
+				chunk_free(&cookie2);
+				DBG1(DBG_IKE, "COOKIE2 mismatch, closing IKE_SA");
+				return FAILED;
+			}
+			chunk_free(&cookie2);
+		}
+		else
+		{
+			process_payloads(this, message);
+		}
+		if (this->natd)
+		{
+			this->natd->task.process(&this->natd->task, message);
+			if (this->natd->has_mapping_changed(this->natd))
+			{
+				/* force an update if mappings have changed */
+				this->update = this->check = TRUE;
+				DBG1(DBG_IKE, "detected changes in NAT mappings, "
+					 "initiating MOBIKE update");
+			}
+		}
+		if (this->update)
+		{
+			/* update again, as NAT state may have changed */
+			update_children(this);
+		}
+		if (this->check)
+		{
+			host_t *me_new, *me_old, *other_new, *other_old;
+
+			me_new = message->get_destination(message);
+			other_new = message->get_source(message);
+			me_old = this->ike_sa->get_my_host(this->ike_sa);
+			other_old = this->ike_sa->get_other_host(this->ike_sa);
+
+			if (!me_new->equals(me_new, me_old))
+			{
+				this->update = TRUE;
+				this->ike_sa->set_my_host(this->ike_sa, me_new->clone(me_new));
+			}
+			if (!other_new->equals(other_new, other_old))
+			{
+				this->update = TRUE;
+				this->ike_sa->set_other_host(this->ike_sa, other_new->clone(other_new));
+			}
+			if (this->update)
+			{
+				/* start the update with the same task */
+				this->check = FALSE;
+				this->address = FALSE;
+				if (this->natd)
+				{
+					this->natd->task.destroy(&this->natd->task);
+				}
+				this->natd = ike_natd_create(this->ike_sa, this->initiator);
+				this->ike_sa->set_pending_updates(this->ike_sa, 1);
+				return NEED_MORE;
+			}
+		}
+		return SUCCESS;
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of ike_mobike_t.roam.
+ */
+static void roam(private_ike_mobike_t *this, bool address)
+{
+	this->check = TRUE;
+	this->address = address;
+	this->ike_sa->set_pending_updates(this->ike_sa,
+							this->ike_sa->get_pending_updates(this->ike_sa) + 1);
+}
+
+/**
+ * Implementation of ike_mobike_t.dpd
+ */
+static void dpd(private_ike_mobike_t *this)
+{
+	if (!this->natd)
+	{
+		this->natd = ike_natd_create(this->ike_sa, this->initiator);
+	}
+	this->address = FALSE;
+	this->ike_sa->set_pending_updates(this->ike_sa,
+							this->ike_sa->get_pending_updates(this->ike_sa) + 1);
+}
+
+/**
+ * Implementation of ike_mobike_t.is_probing.
+ */
+static bool is_probing(private_ike_mobike_t *this)
+{
+	return this->check;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_mobike_t *this)
+{
+	return IKE_MOBIKE;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_mobike_t *this, ike_sa_t *ike_sa)
+{
+	chunk_free(&this->cookie2);
+	this->ike_sa = ike_sa;
+	if (this->natd)
+	{
+		this->natd->task.migrate(&this->natd->task, ike_sa);
+	}
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_mobike_t *this)
+{
+	chunk_free(&this->cookie2);
+	if (this->natd)
+	{
+		this->natd->task.destroy(&this->natd->task);
+	}
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_mobike_t *ike_mobike_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_mobike_t *this = malloc_thing(private_ike_mobike_t);
+
+	this->public.roam = (void(*)(ike_mobike_t*,bool))roam;
+	this->public.dpd = (void(*)(ike_mobike_t*))dpd;
+	this->public.transmit = (void(*)(ike_mobike_t*,packet_t*))transmit;
+	this->public.is_probing = (bool(*)(ike_mobike_t*))is_probing;
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+
+	this->ike_sa = ike_sa;
+	this->initiator = initiator;
+	this->update = FALSE;
+	this->check = FALSE;
+	this->address = TRUE;
+	this->cookie2 = chunk_empty;
+	this->natd = NULL;
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/tasks/ike_mobike.h b/src/libcharon/sa/tasks/ike_mobike.h
new file mode 100644
index 000000000..05b2224d1
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_mobike.h
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_mobike ike_mobike
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_MOBIKE_H_
+#define IKE_MOBIKE_H_
+
+typedef struct ike_mobike_t ike_mobike_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+#include <network/packet.h>
+
+/**
+ * Task of type ike_mobike, detects and handles MOBIKE extension.
+ *
+ * The MOBIKE extension is defined in RFC4555. It allows to update IKE
+ * and IPsec tunnel addresses.
+ * This tasks handles the MOBIKE_SUPPORTED notify exchange to detect MOBIKE
+ * support, allows the exchange of ADDITIONAL_*_ADDRESS to exchange additional
+ * endpoints and handles the UPDATE_SA_ADDRESS notify to finally update
+ * endpoints.
+ */
+struct ike_mobike_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+
+	/**
+	 * Use the task to roam to other addresses.
+	 *
+	 * @param address		TRUE to include address list update
+	 */
+	void (*roam)(ike_mobike_t *this, bool address);
+
+	/**
+	 * Use the task for a DPD check which detects changes in NAT mappings.
+	 */
+	void (*dpd)(ike_mobike_t *this);
+
+	/**
+	 * Transmision hook, called by task manager.
+	 *
+	 * The task manager calls this hook whenever it transmits a packet. It
+	 * allows the mobike task to send the packet on multiple paths to do path
+	 * probing.
+	 *
+	 * @param packet		the packet to transmit
+	 */
+	void (*transmit)(ike_mobike_t *this, packet_t *packet);
+
+	/**
+	 * Check if this task is probing for routability.
+	 *
+	 * @return				TRUE if task is probing
+	 */
+	bool (*is_probing)(ike_mobike_t *this);
+};
+
+/**
+ * Create a new ike_mobike task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if taks is initiated by us
+ * @return				ike_mobike task to handle by the task_manager
+ */
+ike_mobike_t *ike_mobike_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_MOBIKE_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_natd.c b/src/libcharon/sa/tasks/ike_natd.c
new file mode 100644
index 000000000..9ea20ba36
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_natd.c
@@ -0,0 +1,490 @@
+/*
+ * Copyright (C) 2006-2007 Martin Willi
+ * Copyright (C) 2006 Tobias Brunner, Daniel Roethlisberger
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_natd.h"
+
+#include <string.h>
+
+#include <daemon.h>
+#include <config/peer_cfg.h>
+#include <crypto/hashers/hasher.h>
+#include <encoding/payloads/notify_payload.h>
+
+
+typedef struct private_ike_natd_t private_ike_natd_t;
+
+/**
+ * Private members of a ike_natd_t task.
+ */
+struct private_ike_natd_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_natd_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * Hasher used to build NAT detection hashes
+	 */
+	hasher_t *hasher;
+
+	/**
+	 * Did we process any NAT detection notifys for a source address?
+	 */
+	bool src_seen;
+
+	/**
+	 * Did we process any NAT detection notifys for a destination address?
+	 */
+	bool dst_seen;
+
+	/**
+	 * Have we found a matching source address NAT hash?
+	 */
+	bool src_matched;
+
+	/**
+	 * Have we found a matching destination address NAT hash?
+	 */
+	bool dst_matched;
+
+	/**
+	 * whether NAT mappings for our NATed address has changed
+	 */
+	bool mapping_changed;
+};
+
+
+/**
+ * Build NAT detection hash for a host
+ */
+static chunk_t generate_natd_hash(private_ike_natd_t *this,
+								  ike_sa_id_t *ike_sa_id, host_t *host)
+{
+	chunk_t natd_chunk, spi_i_chunk, spi_r_chunk, addr_chunk, port_chunk;
+	chunk_t natd_hash;
+	u_int64_t spi_i, spi_r;
+	u_int16_t port;
+
+	/* prepare all required chunks */
+	spi_i = ike_sa_id->get_initiator_spi(ike_sa_id);
+	spi_r = ike_sa_id->get_responder_spi(ike_sa_id);
+	spi_i_chunk.ptr = (void*)&spi_i;
+	spi_i_chunk.len = sizeof(spi_i);
+	spi_r_chunk.ptr = (void*)&spi_r;
+	spi_r_chunk.len = sizeof(spi_r);
+	port = htons(host->get_port(host));
+	port_chunk.ptr = (void*)&port;
+	port_chunk.len = sizeof(port);
+	addr_chunk = host->get_address(host);
+
+	/*  natd_hash = SHA1( spi_i | spi_r | address | port ) */
+	natd_chunk = chunk_cat("cccc", spi_i_chunk, spi_r_chunk, addr_chunk, port_chunk);
+	this->hasher->allocate_hash(this->hasher, natd_chunk, &natd_hash);
+	DBG3(DBG_IKE, "natd_chunk %B", &natd_chunk);
+	DBG3(DBG_IKE, "natd_hash %B", &natd_hash);
+
+	chunk_free(&natd_chunk);
+	return natd_hash;
+}
+
+/**
+ * build a faked NATD payload to enforce UDP encap
+ */
+static chunk_t generate_natd_hash_faked(private_ike_natd_t *this)
+{
+	rng_t *rng;
+	chunk_t chunk;
+
+	rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
+	if (!rng)
+	{
+		DBG1(DBG_IKE, "unable to get random bytes for NATD fake");
+		return chunk_empty;
+	}
+	rng->allocate_bytes(rng, HASH_SIZE_SHA1, &chunk);
+	rng->destroy(rng);
+	return chunk;
+}
+
+/**
+ * Build a NAT detection notify payload.
+ */
+static notify_payload_t *build_natd_payload(private_ike_natd_t *this,
+											notify_type_t type, host_t *host)
+{
+	chunk_t hash;
+	notify_payload_t *notify;
+	ike_sa_id_t *ike_sa_id;
+	ike_cfg_t *config;
+
+	ike_sa_id = this->ike_sa->get_id(this->ike_sa);
+	config = this->ike_sa->get_ike_cfg(this->ike_sa);
+	if (config->force_encap(config) && type == NAT_DETECTION_SOURCE_IP)
+	{
+		hash = generate_natd_hash_faked(this);
+	}
+	else
+	{
+		hash = generate_natd_hash(this, ike_sa_id, host);
+	}
+	notify = notify_payload_create();
+	notify->set_notify_type(notify, type);
+	notify->set_notification_data(notify, hash);
+	chunk_free(&hash);
+
+	return notify;
+}
+
+/**
+ * read notifys from message and evaluate them
+ */
+static void process_payloads(private_ike_natd_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+	notify_payload_t *notify;
+	chunk_t hash, src_hash, dst_hash;
+	ike_sa_id_t *ike_sa_id;
+	host_t *me, *other;
+	ike_cfg_t *config;
+
+	/* Precompute NAT-D hashes for incoming NAT notify comparison */
+	ike_sa_id = message->get_ike_sa_id(message);
+	me = message->get_destination(message);
+	other = message->get_source(message);
+	dst_hash = generate_natd_hash(this, ike_sa_id, me);
+	src_hash = generate_natd_hash(this, ike_sa_id, other);
+
+	DBG3(DBG_IKE, "precalculated src_hash %B", &src_hash);
+	DBG3(DBG_IKE, "precalculated dst_hash %B", &dst_hash);
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) != NOTIFY)
+		{
+			continue;
+		}
+		notify = (notify_payload_t*)payload;
+		switch (notify->get_notify_type(notify))
+		{
+			case NAT_DETECTION_DESTINATION_IP:
+			{
+				this->dst_seen = TRUE;
+				hash = notify->get_notification_data(notify);
+				if (!this->dst_matched)
+				{
+					DBG3(DBG_IKE, "received dst_hash %B", &hash);
+					if (chunk_equals(hash, dst_hash))
+					{
+						this->dst_matched = TRUE;
+					}
+				}
+				/* RFC4555 says we should also compare against IKE_SA_INIT
+				 * NATD payloads, but this does not work: We are running
+				 * there at port 500, but use 4500 afterwards... */
+				if (message->get_exchange_type(message) == INFORMATIONAL &&
+					this->initiator && !this->dst_matched)
+				{
+					this->mapping_changed = this->ike_sa->has_mapping_changed(
+															this->ike_sa, hash);
+				}
+				break;
+			}
+			case NAT_DETECTION_SOURCE_IP:
+			{
+				this->src_seen = TRUE;
+				if (!this->src_matched)
+				{
+					hash = notify->get_notification_data(notify);
+					DBG3(DBG_IKE, "received src_hash %B", &hash);
+					if (chunk_equals(hash, src_hash))
+					{
+						this->src_matched = TRUE;
+					}
+				}
+				break;
+			}
+			default:
+				break;
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	chunk_free(&src_hash);
+	chunk_free(&dst_hash);
+
+	if (this->src_seen && this->dst_seen)
+	{
+		this->ike_sa->enable_extension(this->ike_sa, EXT_NATT);
+
+		this->ike_sa->set_condition(this->ike_sa, COND_NAT_HERE,
+									!this->dst_matched);
+		this->ike_sa->set_condition(this->ike_sa, COND_NAT_THERE,
+									!this->src_matched);
+		config = this->ike_sa->get_ike_cfg(this->ike_sa);
+		if (this->dst_matched && this->src_matched &&
+			config->force_encap(config))
+		{
+			this->ike_sa->set_condition(this->ike_sa, COND_NAT_FAKE, TRUE);
+		}
+	}
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_natd_t *this, message_t *message)
+{
+	process_payloads(this, message);
+
+	if (message->get_exchange_type(message) == IKE_SA_INIT)
+	{
+		peer_cfg_t *peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+
+#ifdef ME
+		/* if we are on a mediated connection we have already switched to
+		 * port 4500 and the correct destination port is already configured,
+		 * therefore we must not switch again */
+		if (peer_cfg->get_mediated_by(peer_cfg))
+		{
+			return SUCCESS;
+		}
+#endif /* ME */
+
+		if (this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY) ||
+#ifdef ME
+			/* if we are on a mediation connection we switch to port 4500 even
+			 * if no NAT is detected. */
+			peer_cfg->is_mediation(peer_cfg) ||
+#endif /* ME */
+			/* if peer supports NAT-T, we switch to port 4500 even
+			 * if no NAT is detected. MOBIKE requires this. */
+			(peer_cfg->use_mobike(peer_cfg) &&
+			 this->ike_sa->supports_extension(this->ike_sa, EXT_NATT)))
+		{
+			host_t *me, *other;
+
+			/* do not switch if we have a custom port from mobike/NAT */
+			me = this->ike_sa->get_my_host(this->ike_sa);
+			if (me->get_port(me) == IKEV2_UDP_PORT)
+			{
+				me->set_port(me, IKEV2_NATT_PORT);
+			}
+			other = this->ike_sa->get_other_host(this->ike_sa);
+			if (other->get_port(other) == IKEV2_UDP_PORT)
+			{
+				other->set_port(other, IKEV2_NATT_PORT);
+			}
+		}
+	}
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t build_i(private_ike_natd_t *this, message_t *message)
+{
+	notify_payload_t *notify;
+	enumerator_t *enumerator;
+	ike_cfg_t *ike_cfg;
+	host_t *host;
+
+	if (this->hasher == NULL)
+	{
+		DBG1(DBG_IKE, "unable to build NATD payloads, SHA1 not supported");
+		return NEED_MORE;
+	}
+
+	ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
+
+	/* destination is always set */
+	host = message->get_destination(message);
+	notify = build_natd_payload(this, NAT_DETECTION_DESTINATION_IP, host);
+	message->add_payload(message, (payload_t*)notify);
+
+	/* source may be any, we have 3 possibilities to get our source address:
+	 * 1. It is defined in the config => use the one of the IKE_SA
+	 * 2. We do a routing lookup in the kernel interface
+	 * 3. Include all possbile addresses
+	 */
+	host = message->get_source(message);
+	if (!host->is_anyaddr(host))
+	{	/* 1. */
+		notify = build_natd_payload(this, NAT_DETECTION_SOURCE_IP, host);
+		message->add_payload(message, (payload_t*)notify);
+	}
+	else
+	{
+		host = charon->kernel_interface->get_source_addr(charon->kernel_interface,
+							this->ike_sa->get_other_host(this->ike_sa), NULL);
+		if (host)
+		{	/* 2. */
+			host->set_port(host, ike_cfg->get_my_port(ike_cfg));
+			notify = build_natd_payload(this, NAT_DETECTION_SOURCE_IP, host);
+			message->add_payload(message, (payload_t*)notify);
+			host->destroy(host);
+		}
+		else
+		{	/* 3. */
+			enumerator = charon->kernel_interface->create_address_enumerator(
+										charon->kernel_interface, FALSE, FALSE);
+			while (enumerator->enumerate(enumerator, (void**)&host))
+			{
+				/* apply port 500 to host, but work on a copy */
+				host = host->clone(host);
+				host->set_port(host, ike_cfg->get_my_port(ike_cfg));
+				notify = build_natd_payload(this, NAT_DETECTION_SOURCE_IP, host);
+				host->destroy(host);
+				message->add_payload(message, (payload_t*)notify);
+			}
+			enumerator->destroy(enumerator);
+		}
+	}
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_natd_t *this, message_t *message)
+{
+	notify_payload_t *notify;
+	host_t *me, *other;
+
+	/* only add notifies on successfull responses. */
+	if (message->get_exchange_type(message) == IKE_SA_INIT &&
+		message->get_payload(message, SECURITY_ASSOCIATION) == NULL)
+	{
+		return SUCCESS;
+	}
+
+	if (this->src_seen && this->dst_seen)
+	{
+		if (this->hasher == NULL)
+		{
+			DBG1(DBG_IKE, "unable to build NATD payloads, SHA1 not supported");
+			return SUCCESS;
+		}
+
+		/* initiator seems to support NAT detection, add response */
+		me = message->get_source(message);
+		notify = build_natd_payload(this, NAT_DETECTION_SOURCE_IP, me);
+		message->add_payload(message, (payload_t*)notify);
+
+		other = message->get_destination(message);
+		notify = build_natd_payload(this, NAT_DETECTION_DESTINATION_IP, other);
+		message->add_payload(message, (payload_t*)notify);
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_natd_t *this, message_t *message)
+{
+	process_payloads(this, message);
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_natd_t *this)
+{
+	return IKE_NATD;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_natd_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+	this->src_seen = FALSE;
+	this->dst_seen = FALSE;
+	this->src_matched = FALSE;
+	this->dst_matched = FALSE;
+	this->mapping_changed = FALSE;
+}
+
+/**
+ * Implementation of ike_natd_t.has_mapping_changed
+ */
+static bool has_mapping_changed(private_ike_natd_t *this)
+{
+	return this->mapping_changed;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_natd_t *this)
+{
+	DESTROY_IF(this->hasher);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_natd_t *ike_natd_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_natd_t *this = malloc_thing(private_ike_natd_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+
+	this->public.has_mapping_changed = (bool(*)(ike_natd_t*))has_mapping_changed;
+
+	this->ike_sa = ike_sa;
+	this->initiator = initiator;
+	this->hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
+	this->src_seen = FALSE;
+	this->dst_seen = FALSE;
+	this->src_matched = FALSE;
+	this->dst_matched = FALSE;
+	this->mapping_changed = FALSE;
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/ike_natd.h b/src/libcharon/sa/tasks/ike_natd.h
new file mode 100644
index 000000000..97b652ead
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_natd.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_natd ike_natd
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_NATD_H_
+#define IKE_NATD_H_
+
+typedef struct ike_natd_t ike_natd_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type ike_natd, detects NAT situation in IKE_SA_INIT exchange.
+ */
+struct ike_natd_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+
+	/**
+	 * Check if the NAT mapping has changed for our address.
+	 *
+	 * MOBIKE uses NAT payloads in DPD to detect changes in the NAT mappings.
+	 *
+	 * @return 	TRUE if mappings have changed
+	 */
+	bool (*has_mapping_changed)(ike_natd_t *this);
+};
+
+/**
+ * Create a new ike_natd task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if thask is the original initator
+ * @return			  ike_natd task to handle by the task_manager
+ */
+ike_natd_t *ike_natd_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_NATD_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_reauth.c b/src/libcharon/sa/tasks/ike_reauth.c
new file mode 100644
index 000000000..ac89c358b
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_reauth.c
@@ -0,0 +1,196 @@
+/*
+ * Copyright (C) 2006-2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_reauth.h"
+
+#include <daemon.h>
+#include <sa/tasks/ike_delete.h>
+
+
+typedef struct private_ike_reauth_t private_ike_reauth_t;
+
+/**
+ * Private members of a ike_reauth_t task.
+ */
+struct private_ike_reauth_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_reauth_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * reused ike_delete task
+	 */
+	ike_delete_t *ike_delete;
+};
+
+/**
+ * Implementation of task_t.build for initiator
+ */
+static status_t build_i(private_ike_reauth_t *this, message_t *message)
+{
+	return this->ike_delete->task.build(&this->ike_delete->task, message);
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_reauth_t *this, message_t *message)
+{
+	ike_sa_t *new;
+	host_t *host;
+	iterator_t *iterator;
+	child_sa_t *child_sa;
+	peer_cfg_t *peer_cfg;
+
+	/* process delete response first */
+	this->ike_delete->task.process(&this->ike_delete->task, message);
+
+	peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+
+	/* reauthenticate only if we have children */
+	iterator = this->ike_sa->create_child_sa_iterator(this->ike_sa);
+	if (iterator->get_count(iterator) == 0
+#ifdef ME
+		/* we allow peers to reauth mediation connections (without children) */
+		&& !peer_cfg->is_mediation(peer_cfg)
+#endif /* ME */
+		)
+	{
+		DBG1(DBG_IKE, "unable to reauthenticate IKE_SA, no CHILD_SA to recreate");
+		iterator->destroy(iterator);
+		return FAILED;
+	}
+
+	new = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager, TRUE);
+
+	new->set_peer_cfg(new, peer_cfg);
+	host = this->ike_sa->get_other_host(this->ike_sa);
+	new->set_other_host(new, host->clone(host));
+	host = this->ike_sa->get_my_host(this->ike_sa);
+	new->set_my_host(new, host->clone(host));
+	/* if we already have a virtual IP, we reuse it */
+	host = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
+	if (host)
+	{
+		new->set_virtual_ip(new, TRUE, host);
+	}
+
+#ifdef ME
+	/* we initiate the new IKE_SA of the mediation connection without CHILD_SA */
+	if (peer_cfg->is_mediation(peer_cfg))
+	{
+		if (new->initiate(new, NULL, 0, NULL, NULL) == DESTROY_ME)
+		{
+			charon->ike_sa_manager->checkin_and_destroy(
+								charon->ike_sa_manager, new);
+			/* set threads active IKE_SA after checkin */
+			charon->bus->set_sa(charon->bus, this->ike_sa);
+			DBG1(DBG_IKE, "reauthenticating IKE_SA failed");
+			return FAILED;
+		}
+	}
+#endif /* ME */
+
+	while (iterator->iterate(iterator, (void**)&child_sa))
+	{
+		switch (child_sa->get_state(child_sa))
+		{
+			case CHILD_ROUTED:
+			{
+				/* move routed child directly */
+				iterator->remove(iterator);
+				new->add_child_sa(new, child_sa);
+				break;
+			}
+			default:
+			{
+				/* initiate/queue all child SAs */
+				child_cfg_t *child_cfg = child_sa->get_config(child_sa);
+				child_cfg->get_ref(child_cfg);
+				if (new->initiate(new, child_cfg, 0, NULL, NULL) == DESTROY_ME)
+				{
+					iterator->destroy(iterator);
+					charon->ike_sa_manager->checkin_and_destroy(
+										charon->ike_sa_manager, new);
+					/* set threads active IKE_SA after checkin */
+					charon->bus->set_sa(charon->bus, this->ike_sa);
+					DBG1(DBG_IKE, "reauthenticating IKE_SA failed");
+					return FAILED;
+				}
+				break;
+			}
+		}
+	}
+	iterator->destroy(iterator);
+	charon->ike_sa_manager->checkin(charon->ike_sa_manager, new);
+	/* set threads active IKE_SA after checkin */
+	charon->bus->set_sa(charon->bus, this->ike_sa);
+
+	/* we always return failed to delete the obsolete IKE_SA */
+	return FAILED;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_reauth_t *this)
+{
+	return IKE_REAUTH;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_reauth_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_delete->task.migrate(&this->ike_delete->task, ike_sa);
+	this->ike_sa = ike_sa;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_reauth_t *this)
+{
+	this->ike_delete->task.destroy(&this->ike_delete->task);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_reauth_t *ike_reauth_create(ike_sa_t *ike_sa)
+{
+	private_ike_reauth_t *this = malloc_thing(private_ike_reauth_t);
+
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+	this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+	this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+
+	this->ike_sa = ike_sa;
+	this->ike_delete = ike_delete_create(ike_sa, TRUE);
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/tasks/ike_reauth.h b/src/libcharon/sa/tasks/ike_reauth.h
new file mode 100644
index 000000000..5e97b719c
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_reauth.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_reauth ike_reauth
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_REAUTH_H_
+#define IKE_REAUTH_H_
+
+typedef struct ike_reauth_t ike_reauth_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type ike_reauth, reestablishes an IKE_SA.
+ */
+struct ike_reauth_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+};
+
+/**
+ * Create a new ike_reauth task.
+ *
+ * This task is initiator only.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @return				ike_reauth task to handle by the task_manager
+ */
+ike_reauth_t *ike_reauth_create(ike_sa_t *ike_sa);
+
+#endif /** IKE_REAUTH_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_rekey.c b/src/libcharon/sa/tasks/ike_rekey.c
new file mode 100644
index 000000000..a2275e796
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_rekey.c
@@ -0,0 +1,409 @@
+/*
+ * Copyright (C) 2005-2008 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_rekey.h"
+
+#include <daemon.h>
+#include <encoding/payloads/notify_payload.h>
+#include <sa/tasks/ike_init.h>
+#include <sa/tasks/ike_delete.h>
+#include <processing/jobs/delete_ike_sa_job.h>
+#include <processing/jobs/rekey_ike_sa_job.h>
+
+
+typedef struct private_ike_rekey_t private_ike_rekey_t;
+
+/**
+ * Private members of a ike_rekey_t task.
+ */
+struct private_ike_rekey_t {
+
+	/**
+	 * Public methods and task_t interface.
+	 */
+	ike_rekey_t public;
+
+	/**
+	 * Assigned IKE_SA.
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * New IKE_SA which replaces the current one
+	 */
+	ike_sa_t *new_sa;
+
+	/**
+	 * Are we the initiator?
+	 */
+	bool initiator;
+
+	/**
+	 * the IKE_INIT task which is reused to simplify rekeying
+	 */
+	ike_init_t *ike_init;
+
+	/**
+	 * IKE_DELETE task to delete the old IKE_SA after rekeying was successful
+	 */
+	ike_delete_t *ike_delete;
+
+	/**
+	 * colliding task detected by the task manager
+	 */
+	task_t *collision;
+};
+
+/**
+ * Implementation of task_t.build for initiator, after rekeying
+ */
+static status_t build_i_delete(private_ike_rekey_t *this, message_t *message)
+{
+	/* update exchange type to INFORMATIONAL for the delete */
+	message->set_exchange_type(message, INFORMATIONAL);
+
+	return this->ike_delete->task.build(&this->ike_delete->task, message);
+}
+
+/**
+ * Implementation of task_t.process for initiator, after rekeying
+ */
+static status_t process_i_delete(private_ike_rekey_t *this, message_t *message)
+{
+	return this->ike_delete->task.process(&this->ike_delete->task, message);
+}
+
+/**
+ * Implementation of task_t.build for initiator
+ */
+static status_t build_i(private_ike_rekey_t *this, message_t *message)
+{
+	peer_cfg_t *peer_cfg;
+	host_t *other_host;
+
+	/* create new SA only on first try */
+	if (this->new_sa == NULL)
+	{
+		this->new_sa = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager,
+															TRUE);
+
+		peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+		other_host = this->ike_sa->get_other_host(this->ike_sa);
+		this->new_sa->set_peer_cfg(this->new_sa, peer_cfg);
+		this->new_sa->set_other_host(this->new_sa, other_host->clone(other_host));
+		this->ike_init = ike_init_create(this->new_sa, TRUE, this->ike_sa);
+		this->ike_sa->set_state(this->ike_sa, IKE_REKEYING);
+	}
+	this->ike_init->task.build(&this->ike_init->task, message);
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.process for responder
+ */
+static status_t process_r(private_ike_rekey_t *this, message_t *message)
+{
+	peer_cfg_t *peer_cfg;
+	iterator_t *iterator;
+	child_sa_t *child_sa;
+
+	if (this->ike_sa->get_state(this->ike_sa) == IKE_DELETING)
+	{
+		DBG1(DBG_IKE, "peer initiated rekeying, but we are deleting");
+		return NEED_MORE;
+	}
+
+	iterator = this->ike_sa->create_child_sa_iterator(this->ike_sa);
+	while (iterator->iterate(iterator, (void**)&child_sa))
+	{
+		switch (child_sa->get_state(child_sa))
+		{
+			case CHILD_CREATED:
+			case CHILD_REKEYING:
+			case CHILD_DELETING:
+				/* we do not allow rekeying while we have children in-progress */
+				DBG1(DBG_IKE, "peer initiated rekeying, but a child is half-open");
+				iterator->destroy(iterator);
+				return NEED_MORE;
+			default:
+				break;
+		}
+	}
+	iterator->destroy(iterator);
+
+	this->new_sa = charon->ike_sa_manager->checkout_new(charon->ike_sa_manager,
+														FALSE);
+
+	peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
+	this->new_sa->set_peer_cfg(this->new_sa, peer_cfg);
+	this->ike_init = ike_init_create(this->new_sa, FALSE, this->ike_sa);
+	this->ike_init->task.process(&this->ike_init->task, message);
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.build for responder
+ */
+static status_t build_r(private_ike_rekey_t *this, message_t *message)
+{
+	if (this->new_sa == NULL)
+	{
+		/* IKE_SA/a CHILD_SA is in an inacceptable state, deny rekeying */
+		message->add_notify(message, TRUE, NO_PROPOSAL_CHOSEN, chunk_empty);
+		return SUCCESS;
+	}
+
+	if (this->ike_init->task.build(&this->ike_init->task, message) == FAILED)
+	{
+		return SUCCESS;
+	}
+
+	this->ike_sa->set_state(this->ike_sa, IKE_REKEYING);
+	this->new_sa->set_state(this->new_sa, IKE_ESTABLISHED);
+	DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
+		 this->new_sa->get_name(this->new_sa),
+		 this->new_sa->get_unique_id(this->new_sa),
+		 this->ike_sa->get_my_host(this->ike_sa),
+		 this->ike_sa->get_my_id(this->ike_sa),
+		 this->ike_sa->get_other_host(this->ike_sa),
+		 this->ike_sa->get_other_id(this->ike_sa));
+
+	return SUCCESS;
+}
+
+/**
+ * Implementation of task_t.process for initiator
+ */
+static status_t process_i(private_ike_rekey_t *this, message_t *message)
+{
+	if (message->get_notify(message, NO_ADDITIONAL_SAS))
+	{
+		DBG1(DBG_IKE, "peer seems to not support IKE rekeying, "
+			 "starting reauthentication");
+		this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
+		charon->processor->queue_job(charon->processor,
+				(job_t*)rekey_ike_sa_job_create(
+							this->ike_sa->get_id(this->ike_sa), TRUE));
+		return SUCCESS;
+	}
+
+	switch (this->ike_init->task.process(&this->ike_init->task, message))
+	{
+		case FAILED:
+			/* rekeying failed, fallback to old SA */
+			if (!(this->collision && (
+				this->collision->get_type(this->collision) == IKE_DELETE ||
+				this->collision->get_type(this->collision) == IKE_REAUTH)))
+			{
+				job_t *job;
+				u_int32_t retry = RETRY_INTERVAL - (random() % RETRY_JITTER);
+				job = (job_t*)rekey_ike_sa_job_create(
+										this->ike_sa->get_id(this->ike_sa), FALSE);
+				DBG1(DBG_IKE, "IKE_SA rekeying failed, "
+										"trying again in %d seconds", retry);
+				this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
+				charon->scheduler->schedule_job(charon->scheduler, job, retry);
+			}
+			return SUCCESS;
+		case NEED_MORE:
+			/* bad dh group, try again */
+			this->ike_init->task.migrate(&this->ike_init->task, this->new_sa);
+			return NEED_MORE;
+		default:
+			break;
+	}
+
+	this->new_sa->set_state(this->new_sa, IKE_ESTABLISHED);
+	DBG0(DBG_IKE, "IKE_SA %s[%d] established between %H[%Y]...%H[%Y]",
+		 this->new_sa->get_name(this->new_sa),
+		 this->new_sa->get_unique_id(this->new_sa),
+		 this->ike_sa->get_my_host(this->ike_sa),
+		 this->ike_sa->get_my_id(this->ike_sa),
+		 this->ike_sa->get_other_host(this->ike_sa),
+		 this->ike_sa->get_other_id(this->ike_sa));
+
+	/* check for collisions */
+	if (this->collision &&
+		this->collision->get_type(this->collision) == IKE_REKEY)
+	{
+		chunk_t this_nonce, other_nonce;
+		host_t *host;
+		private_ike_rekey_t *other = (private_ike_rekey_t*)this->collision;
+
+		this_nonce = this->ike_init->get_lower_nonce(this->ike_init);
+		other_nonce = other->ike_init->get_lower_nonce(other->ike_init);
+
+		/* if we have the lower nonce, delete rekeyed SA. If not, delete
+		 * the redundant. */
+		if (memcmp(this_nonce.ptr, other_nonce.ptr,
+				   min(this_nonce.len, other_nonce.len)) < 0)
+		{
+			/* peer should delete this SA. Add a timeout just in case. */
+			job_t *job = (job_t*)delete_ike_sa_job_create(
+									other->new_sa->get_id(other->new_sa), TRUE);
+			charon->scheduler->schedule_job(charon->scheduler, job, 10);
+			DBG1(DBG_IKE, "IKE_SA rekey collision won, deleting rekeyed IKE_SA");
+			charon->ike_sa_manager->checkin(charon->ike_sa_manager, other->new_sa);
+			other->new_sa = NULL;
+		}
+		else
+		{
+			DBG1(DBG_IKE, "IKE_SA rekey collision lost, deleting redundant IKE_SA");
+			/* apply host for a proper delete */
+			host = this->ike_sa->get_my_host(this->ike_sa);
+			this->new_sa->set_my_host(this->new_sa, host->clone(host));
+			host = this->ike_sa->get_other_host(this->ike_sa);
+			this->new_sa->set_other_host(this->new_sa, host->clone(host));
+			this->ike_sa->set_state(this->ike_sa, IKE_ESTABLISHED);
+			if (this->new_sa->delete(this->new_sa) == DESTROY_ME)
+			{
+				charon->ike_sa_manager->checkin_and_destroy(
+										charon->ike_sa_manager, this->new_sa);
+			}
+			else
+			{
+				charon->ike_sa_manager->checkin(
+										charon->ike_sa_manager, this->new_sa);
+			}
+			/* set threads active IKE_SA after checkin */
+			charon->bus->set_sa(charon->bus, this->ike_sa);
+			/* inherit to other->new_sa in destroy() */
+			this->new_sa = other->new_sa;
+			other->new_sa = NULL;
+			return SUCCESS;
+		}
+		/* set threads active IKE_SA after checkin */
+		charon->bus->set_sa(charon->bus, this->ike_sa);
+	}
+
+	/* rekeying successful, delete the IKE_SA using a subtask */
+	this->ike_delete = ike_delete_create(this->ike_sa, TRUE);
+	this->public.task.build = (status_t(*)(task_t*,message_t*))build_i_delete;
+	this->public.task.process = (status_t(*)(task_t*,message_t*))process_i_delete;
+
+	return NEED_MORE;
+}
+
+/**
+ * Implementation of task_t.get_type
+ */
+static task_type_t get_type(private_ike_rekey_t *this)
+{
+	return IKE_REKEY;
+}
+
+static void collide(private_ike_rekey_t* this, task_t *other)
+{
+	DESTROY_IF(this->collision);
+	this->collision = other;
+}
+
+/**
+ * Implementation of task_t.migrate
+ */
+static void migrate(private_ike_rekey_t *this, ike_sa_t *ike_sa)
+{
+	if (this->ike_init)
+	{
+		this->ike_init->task.destroy(&this->ike_init->task);
+	}
+	if (this->ike_delete)
+	{
+		this->ike_delete->task.destroy(&this->ike_delete->task);
+	}
+	if (this->new_sa)
+	{
+		charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager,
+													this->new_sa);
+		/* set threads active IKE_SA after checkin */
+		charon->bus->set_sa(charon->bus, this->ike_sa);
+	}
+	DESTROY_IF(this->collision);
+
+	this->collision = NULL;
+	this->ike_sa = ike_sa;
+	this->new_sa = NULL;
+	this->ike_init = NULL;
+	this->ike_delete = NULL;
+}
+
+/**
+ * Implementation of task_t.destroy
+ */
+static void destroy(private_ike_rekey_t *this)
+{
+	if (this->new_sa)
+	{
+		if (this->new_sa->get_state(this->new_sa) == IKE_ESTABLISHED &&
+			this->new_sa->inherit(this->new_sa, this->ike_sa) != DESTROY_ME)
+		{
+			/* invoke hook if rekeying was successful */
+			charon->bus->ike_rekey(charon->bus, this->ike_sa, this->new_sa);
+			charon->ike_sa_manager->checkin(charon->ike_sa_manager, this->new_sa);
+		}
+		else
+		{
+			charon->ike_sa_manager->checkin_and_destroy(charon->ike_sa_manager,
+														this->new_sa);
+		}
+		/* set threads active IKE_SA after checkin */
+		charon->bus->set_sa(charon->bus, this->ike_sa);
+	}
+	if (this->ike_init)
+	{
+		this->ike_init->task.destroy(&this->ike_init->task);
+	}
+	if (this->ike_delete)
+	{
+		this->ike_delete->task.destroy(&this->ike_delete->task);
+	}
+	DESTROY_IF(this->collision);
+	free(this);
+}
+
+/*
+ * Described in header.
+ */
+ike_rekey_t *ike_rekey_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_rekey_t *this = malloc_thing(private_ike_rekey_t);
+
+	this->public.collide = (void(*)(ike_rekey_t*,task_t*))collide;
+	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
+	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
+	this->public.task.destroy = (void(*)(task_t*))destroy;
+	if (initiator)
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
+	}
+	else
+	{
+		this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
+		this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
+	}
+
+	this->ike_sa = ike_sa;
+	this->new_sa = NULL;
+	this->ike_init = NULL;
+	this->ike_delete = NULL;
+	this->initiator = initiator;
+	this->collision = NULL;
+
+	return &this->public;
+}
diff --git a/src/libcharon/sa/tasks/ike_rekey.h b/src/libcharon/sa/tasks/ike_rekey.h
new file mode 100644
index 000000000..1c9550768
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_rekey.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_rekey ike_rekey
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_REKEY_H_
+#define IKE_REKEY_H_
+
+typedef struct ike_rekey_t ike_rekey_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Task of type IKE_REKEY, rekey an established IKE_SA.
+ */
+struct ike_rekey_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+
+	/**
+	 * Register a rekeying task which collides with this one.
+	 *
+	 * If two peers initiate rekeying at the same time, the collision must
+	 * be handled gracefully. The task manager is aware of what exchanges
+	 * are going on and notifies the outgoing task by passing the incoming.
+	 *
+	 * @param other		incoming task
+	 */
+	void (*collide)(ike_rekey_t* this, task_t *other);
+};
+
+/**
+ * Create a new IKE_REKEY task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE for initiator, FALSE for responder
+ * @return				IKE_REKEY task to handle by the task_manager
+ */
+ike_rekey_t *ike_rekey_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_REKEY_H_ @}*/
diff --git a/src/libcharon/sa/tasks/ike_vendor.c b/src/libcharon/sa/tasks/ike_vendor.c
new file mode 100644
index 000000000..7c435b6d1
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_vendor.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "ike_vendor.h"
+
+#include <daemon.h>
+#include <encoding/payloads/vendor_id_payload.h>
+
+typedef struct private_ike_vendor_t private_ike_vendor_t;
+
+/**
+ * Private data of an ike_vendor_t object.
+ */
+struct private_ike_vendor_t {
+
+	/**
+	 * Public ike_vendor_t interface.
+	 */
+	ike_vendor_t public;
+
+	/**
+	 * Associated IKE_SA
+	 */
+	ike_sa_t *ike_sa;
+
+	/**
+	 * Are we the inititator of this task
+	 */
+	bool initiator;
+};
+
+/**
+ * strongSwan specific vendor ID without version, MD5("strongSwan")
+ */
+static chunk_t strongswan_vid = chunk_from_chars(
+	0x88,0x2f,0xe5,0x6d,0x6f,0xd2,0x0d,0xbc,
+	0x22,0x51,0x61,0x3b,0x2e,0xbe,0x5b,0xeb
+);
+
+METHOD(task_t, build, status_t,
+	private_ike_vendor_t *this, message_t *message)
+{
+	if (lib->settings->get_bool(lib->settings,
+								"charon.send_vendor_id", FALSE))
+	{
+		vendor_id_payload_t *vid;
+
+		vid = vendor_id_payload_create_data(chunk_clone(strongswan_vid));
+		message->add_payload(message, &vid->payload_interface);
+	}
+
+	return this->initiator ? NEED_MORE : SUCCESS;
+}
+
+METHOD(task_t, process, status_t,
+	private_ike_vendor_t *this, message_t *message)
+{
+	enumerator_t *enumerator;
+	payload_t *payload;
+
+	enumerator = message->create_payload_enumerator(message);
+	while (enumerator->enumerate(enumerator, &payload))
+	{
+		if (payload->get_type(payload) == VENDOR_ID)
+		{
+			vendor_id_payload_t *vid;
+			chunk_t data;
+
+			vid = (vendor_id_payload_t*)payload;
+			data = vid->get_data(vid);
+
+			if (chunk_equals(data, strongswan_vid))
+			{
+				DBG1(DBG_IKE, "received strongSwan vendor id");
+				this->ike_sa->enable_extension(this->ike_sa, EXT_STRONGSWAN);
+			}
+			else
+			{
+				DBG1(DBG_ENC, "received unknown vendor id: %#B", &data);
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	return this->initiator ? SUCCESS : NEED_MORE;
+}
+
+METHOD(task_t, migrate, void,
+	private_ike_vendor_t *this, ike_sa_t *ike_sa)
+{
+	this->ike_sa = ike_sa;
+}
+
+METHOD(task_t, get_type, task_type_t,
+	private_ike_vendor_t *this)
+{
+	return IKE_VENDOR;
+}
+
+METHOD(task_t, destroy, void,
+	private_ike_vendor_t *this)
+{
+	free(this);
+}
+
+/**
+ * See header
+ */
+ike_vendor_t *ike_vendor_create(ike_sa_t *ike_sa, bool initiator)
+{
+	private_ike_vendor_t *this;
+
+	INIT(this,
+		.public.task = {
+			.build = _build,
+			.process = _process,
+			.migrate = _migrate,
+			.get_type = _get_type,
+			.destroy = _destroy,
+		},
+		.initiator = initiator,
+		.ike_sa = ike_sa,
+	);
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/tasks/ike_vendor.h b/src/libcharon/sa/tasks/ike_vendor.h
new file mode 100644
index 000000000..dcdd37424
--- /dev/null
+++ b/src/libcharon/sa/tasks/ike_vendor.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_vendor ike_vendor
+ * @{ @ingroup tasks
+ */
+
+#ifndef IKE_VENDOR_H_
+#define IKE_VENDOR_H_
+
+typedef struct ike_vendor_t ike_vendor_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * Vendor ID processing task.
+ */
+struct ike_vendor_t {
+
+	/**
+	 * Implements task interface.
+	 */
+	task_t task;
+};
+
+/**
+ * Create a ike_vendor instance.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if thask is the original initator
+ */
+ike_vendor_t *ike_vendor_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /** IKE_VENDOR_H_ @}*/
diff --git a/src/libcharon/sa/tasks/task.c b/src/libcharon/sa/tasks/task.c
new file mode 100644
index 000000000..0d7383141
--- /dev/null
+++ b/src/libcharon/sa/tasks/task.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2007 Tobias Brunner
+ * Copyright (C) 2007 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "task.h"
+
+#ifdef ME
+ENUM(task_type_names, IKE_INIT, CHILD_REKEY,
+	"IKE_INIT",
+	"IKE_NATD",
+	"IKE_MOBIKE",
+	"IKE_AUTHENTICATE",
+	"IKE_AUTH_LIFETIME",
+	"IKE_CERT_PRE",
+	"IKE_CERT_POST",
+	"IKE_CONFIG",
+	"IKE_REKEY",
+	"IKE_REAUTH",
+	"IKE_DELETE",
+	"IKE_DPD",
+	"IKE_VENDOR",
+	"IKE_ME",
+	"CHILD_CREATE",
+	"CHILD_DELETE",
+	"CHILD_REKEY",
+);
+#else
+ENUM(task_type_names, IKE_INIT, CHILD_REKEY,
+	"IKE_INIT",
+	"IKE_NATD",
+	"IKE_MOBIKE",
+	"IKE_AUTHENTICATE",
+	"IKE_AUTH_LIFETIME",
+	"IKE_CERT_PRE",
+	"IKE_CERT_POST",
+	"IKE_CONFIG",
+	"IKE_REKEY",
+	"IKE_REAUTH",
+	"IKE_DELETE",
+	"IKE_DPD",
+	"IKE_VENDOR",
+	"CHILD_CREATE",
+	"CHILD_DELETE",
+	"CHILD_REKEY",
+);
+#endif /* ME */
diff --git a/src/libcharon/sa/tasks/task.h b/src/libcharon/sa/tasks/task.h
new file mode 100644
index 000000000..4468f2ebe
--- /dev/null
+++ b/src/libcharon/sa/tasks/task.h
@@ -0,0 +1,150 @@
+/*
+ * Copyright (C) 2007 Tobias Brunner
+ * Copyright (C) 2006 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup task task
+ * @{ @ingroup tasks
+ */
+
+#ifndef TASK_H_
+#define TASK_H_
+
+typedef enum task_type_t task_type_t;
+typedef struct task_t task_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <encoding/message.h>
+
+/**
+ * Different kinds of tasks.
+ */
+enum task_type_t {
+	/** establish an unauthenticated IKE_SA */
+	IKE_INIT,
+	/** detect NAT situation */
+	IKE_NATD,
+	/** handle MOBIKE stuff */
+	IKE_MOBIKE,
+	/** authenticate the initiated IKE_SA */
+	IKE_AUTHENTICATE,
+	/** AUTH_LIFETIME negotiation, RFC4478 */
+	IKE_AUTH_LIFETIME,
+	/** certificate processing before authentication (certreqs, cert parsing) */
+	IKE_CERT_PRE,
+	/** certificate processing after authentication (certs payload generation) */
+	IKE_CERT_POST,
+	/** Configuration payloads, virtual IP and such */
+	IKE_CONFIG,
+	/** rekey an IKE_SA */
+	IKE_REKEY,
+	/** reestablish a complete IKE_SA */
+	IKE_REAUTH,
+	/** delete an IKE_SA */
+	IKE_DELETE,
+	/** liveness check */
+	IKE_DPD,
+	/** Vendor ID processing */
+	IKE_VENDOR,
+#ifdef ME
+	/** handle ME stuff */
+	IKE_ME,
+#endif /* ME */
+	/** establish a CHILD_SA within an IKE_SA */
+	CHILD_CREATE,
+	/** delete an established CHILD_SA */
+	CHILD_DELETE,
+	/** rekey an CHILD_SA */
+	CHILD_REKEY,
+};
+
+/**
+ * enum names for task_type_t.
+ */
+extern enum_name_t *task_type_names;
+
+/**
+ * Interface for a task, an operation handled within exchanges.
+ *
+ * A task is an elemantary operation. It may be handled by a single or by
+ * multiple exchanges. An exchange may even complete multiple tasks.
+ * A task has a build() and an process() operation. The build() operation
+ * creates payloads and adds it to the message. The process() operation
+ * inspects a message and handles its payloads. An initiator of an exchange
+ * first calls build() to build the request, and processes the response message
+ * with the process() method.
+ * A responder does the opposite; it calls process() first to handle an incoming
+ * request and secondly calls build() to build an appropriate response.
+ * Both methods return either SUCCESS, NEED_MORE or FAILED. A SUCCESS indicates
+ * that the task completed, even when the task completed unsuccesfully. The
+ * manager then removes the task from the list. A NEED_MORE is returned when
+ * the task needs further build()/process() calls to complete, the manager
+ * leaves the taks in the queue. A returned FAILED indicates a critical failure.
+ * The manager closes the IKE_SA whenever a task returns FAILED.
+ */
+struct task_t {
+
+	/**
+	 * Build a request or response message for this task.
+	 *
+	 * @param message		message to add payloads to
+	 * @return
+	 *						- FAILED if a critical error occured
+	 *						- DESTROY_ME if IKE_SA has been properly deleted
+	 *						- NEED_MORE if another call to build/process needed
+	 *						- SUCCESS if task completed
+	 */
+	status_t (*build) (task_t *this, message_t *message);
+
+	/**
+	 * Process a request or response message for this task.
+	 *
+	 * @param message		message to read payloads from
+	 * @return
+	 * 						- FAILED if a critical error occured
+	 *						- DESTROY_ME if IKE_SA has been properly deleted
+	 *						- NEED_MORE if another call to build/process needed
+	 *						- SUCCESS if task completed
+	 */
+	status_t (*process) (task_t *this, message_t *message);
+
+	/**
+	 * Get the type of the task implementation.
+	 */
+	task_type_t (*get_type) (task_t *this);
+
+	/**
+	 * Migrate a task to a new IKE_SA.
+	 *
+	 * After migrating a task, it goes back to a state where it can be
+	 * used again to initate an exchange. This is useful when a task
+	 * has to get migrated to a new IKE_SA.
+	 * A special usage is when a INVALID_KE_PAYLOAD is received. A call
+	 * to reset resets the task, but uses another DH group for the next
+	 * try.
+	 * The ike_sa is the new IKE_SA this task belongs to and operates on.
+	 *
+	 * @param ike_sa		new IKE_SA this task works for
+	 */
+	void (*migrate) (task_t *this, ike_sa_t *ike_sa);
+
+	/**
+	 * Destroys a task_t object.
+	 */
+	void (*destroy) (task_t *this);
+};
+
+#endif /** TASK_H_ @}*/
diff --git a/src/libcharon/sa/trap_manager.c b/src/libcharon/sa/trap_manager.c
new file mode 100644
index 000000000..878170c83
--- /dev/null
+++ b/src/libcharon/sa/trap_manager.c
@@ -0,0 +1,403 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "trap_manager.h"
+
+#include <daemon.h>
+#include <threading/rwlock.h>
+#include <utils/linked_list.h>
+
+
+typedef struct private_trap_manager_t private_trap_manager_t;
+typedef struct trap_listener_t trap_listener_t;
+
+/**
+ * listener to track acquires
+ */
+struct trap_listener_t {
+
+	/**
+	 * Implements listener interface
+	 */
+	listener_t listener;
+
+	/**
+	 * points to trap_manager
+	 */
+	private_trap_manager_t *traps;
+};
+
+/**
+ * Private data of an trap_manager_t object.
+ */
+struct private_trap_manager_t {
+
+	/**
+	 * Public trap_manager_t interface.
+	 */
+	trap_manager_t public;
+
+	/**
+	 * Installed traps, as entry_t
+	 */
+	linked_list_t *traps;
+
+	/**
+	 * read write lock for traps list
+	 */
+	rwlock_t *lock;
+
+	/**
+	 * listener to track acquiring IKE_SAs
+	 */
+	trap_listener_t listener;
+};
+
+/**
+ * A installed trap entry
+ */
+typedef struct {
+	/** ref to peer_cfg to initiate */
+	peer_cfg_t *peer_cfg;
+	/** ref to instanciated CHILD_SA */
+	child_sa_t *child_sa;
+	/** pending IKE_SA connecting upon acquire */
+	ike_sa_t *pending;
+} entry_t;
+
+/**
+ * actually uninstall and destroy an installed entry
+ */
+static void destroy_entry(entry_t *entry)
+{
+	entry->child_sa->destroy(entry->child_sa);
+	entry->peer_cfg->destroy(entry->peer_cfg);
+	free(entry);
+}
+
+/**
+ * Implementation of trap_manager_t.install
+ */
+static u_int32_t install(private_trap_manager_t *this, peer_cfg_t *peer,
+					 child_cfg_t *child)
+{
+	entry_t *entry;
+	ike_cfg_t *ike_cfg;
+	child_sa_t *child_sa;
+	host_t *me, *other;
+	linked_list_t *my_ts, *other_ts;
+	enumerator_t *enumerator;
+	bool found = FALSE;
+	status_t status;
+	u_int32_t reqid;
+
+	/* check if not already done */
+	this->lock->read_lock(this->lock);
+	enumerator = this->traps->create_enumerator(this->traps);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (streq(entry->child_sa->get_name(entry->child_sa),
+				  child->get_name(child)))
+		{
+			found = TRUE;
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+	if (found)
+	{
+		DBG1(DBG_CFG, "CHILD_SA named '%s' already routed",
+			 child->get_name(child));
+		return 0;
+	}
+
+	/* try to resolve addresses */
+	ike_cfg = peer->get_ike_cfg(peer);
+	other = host_create_from_dns(ike_cfg->get_other_addr(ike_cfg),
+								 0, ike_cfg->get_other_port(ike_cfg));
+	if (!other)
+	{
+		DBG1(DBG_CFG, "installing trap failed, remote address unknown");
+		return 0;
+	}
+	me = host_create_from_dns(ike_cfg->get_my_addr(ike_cfg),
+					other->get_family(other), ike_cfg->get_my_port(ike_cfg));
+	if (!me || me->is_anyaddr(me))
+	{
+		DESTROY_IF(me);
+		me = charon->kernel_interface->get_source_addr(
+									charon->kernel_interface, other, NULL);
+		if (!me)
+		{
+			DBG1(DBG_CFG, "installing trap failed, local address unknown");
+			other->destroy(other);
+			return 0;
+		}
+		me->set_port(me, ike_cfg->get_my_port(ike_cfg));
+	}
+
+	/* create and route CHILD_SA */
+	child_sa = child_sa_create(me, other, child, 0, FALSE);
+	my_ts = child->get_traffic_selectors(child, TRUE, NULL, me);
+	other_ts = child->get_traffic_selectors(child, FALSE, NULL, other);
+	me->destroy(me);
+	other->destroy(other);
+
+	/* while we don't know the finally negotiated protocol (ESP|AH), we
+	 * could iterate all proposals for a best guest (TODO). But as we
+	 * support ESP only for now, we set here. */
+	child_sa->set_protocol(child_sa, PROTO_ESP);
+	child_sa->set_mode(child_sa, child->get_mode(child));
+	status = child_sa->add_policies(child_sa, my_ts, other_ts);
+	my_ts->destroy_offset(my_ts, offsetof(traffic_selector_t, destroy));
+	other_ts->destroy_offset(other_ts, offsetof(traffic_selector_t, destroy));
+	if (status != SUCCESS)
+	{
+		child_sa->destroy(child_sa);
+		DBG1(DBG_CFG, "installing trap failed");
+		return 0;
+	}
+
+	reqid = child_sa->get_reqid(child_sa);
+	entry = malloc_thing(entry_t);
+	entry->child_sa = child_sa;
+	entry->peer_cfg = peer->get_ref(peer);
+	entry->pending = NULL;
+
+	this->lock->write_lock(this->lock);
+	this->traps->insert_last(this->traps, entry);
+	this->lock->unlock(this->lock);
+
+	return reqid;
+}
+
+/**
+ * Implementation of trap_manager_t.uninstall
+ */
+static bool uninstall(private_trap_manager_t *this, u_int32_t reqid)
+{
+	enumerator_t *enumerator;
+	entry_t *entry, *found = NULL;
+
+	this->lock->write_lock(this->lock);
+	enumerator = this->traps->create_enumerator(this->traps);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (entry->child_sa->get_reqid(entry->child_sa) == reqid)
+		{
+			this->traps->remove_at(this->traps, enumerator);
+			found = entry;
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+
+	if (!found)
+	{
+		DBG1(DBG_CFG, "trap %d not found to uninstall", reqid);
+		return FALSE;
+	}
+
+	destroy_entry(found);
+	return TRUE;
+}
+
+/**
+ * convert enumerated entries to peer_cfg, child_sa
+ */
+static bool trap_filter(rwlock_t *lock, entry_t **entry, peer_cfg_t **peer_cfg,
+						void *none, child_sa_t **child_sa)
+{
+	if (peer_cfg)
+	{
+		*peer_cfg = (*entry)->peer_cfg;
+	}
+	if (child_sa)
+	{
+		*child_sa = (*entry)->child_sa;
+	}
+	return TRUE;
+}
+
+/**
+ * Implementation of trap_manager_t.create_enumerator
+ */
+static enumerator_t* create_enumerator(private_trap_manager_t *this)
+{
+	this->lock->read_lock(this->lock);
+	return enumerator_create_filter(this->traps->create_enumerator(this->traps),
+									(void*)trap_filter, this->lock,
+									(void*)this->lock->unlock);
+}
+
+/**
+ * Implementation of trap_manager_t.acquire
+ */
+static void acquire(private_trap_manager_t *this, u_int32_t reqid,
+					traffic_selector_t *src, traffic_selector_t *dst)
+{
+	enumerator_t *enumerator;
+	entry_t *entry, *found = NULL;
+	peer_cfg_t *peer;
+	child_cfg_t *child;
+	ike_sa_t *ike_sa;
+
+	this->lock->read_lock(this->lock);
+	enumerator = this->traps->create_enumerator(this->traps);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (entry->child_sa->get_reqid(entry->child_sa) == reqid)
+		{
+			found = entry;
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	if (!found)
+	{
+		DBG1(DBG_CFG, "trap not found, unable to acquire reqid %d",reqid);
+	}
+	else if (found->pending)
+	{
+		DBG1(DBG_CFG, "ignoring acquire, connection attempt pending");
+	}
+	else
+	{
+		child = found->child_sa->get_config(found->child_sa);
+		peer = found->peer_cfg;
+		ike_sa = charon->ike_sa_manager->checkout_by_config(
+												charon->ike_sa_manager, peer);
+		if (ike_sa->get_peer_cfg(ike_sa) == NULL)
+		{
+			ike_sa->set_peer_cfg(ike_sa, peer);
+		}
+		child->get_ref(child);
+		reqid = found->child_sa->get_reqid(found->child_sa);
+		if (ike_sa->initiate(ike_sa, child, reqid, src, dst) != DESTROY_ME)
+		{
+			found->pending = ike_sa;
+			charon->ike_sa_manager->checkin(charon->ike_sa_manager, ike_sa);
+		}
+		else
+		{
+			charon->ike_sa_manager->checkin_and_destroy(
+												charon->ike_sa_manager, ike_sa);
+		}
+	}
+	this->lock->unlock(this->lock);
+}
+
+/**
+ * Complete the acquire, if successful or failed
+ */
+static void complete(private_trap_manager_t *this, ike_sa_t *ike_sa,
+					 child_sa_t *child_sa)
+{
+	enumerator_t *enumerator;
+	entry_t *entry;
+
+	this->lock->read_lock(this->lock);
+	enumerator = this->traps->create_enumerator(this->traps);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (entry->pending != ike_sa)
+		{
+			continue;
+		}
+		if (child_sa && child_sa->get_reqid(child_sa) !=
+									entry->child_sa->get_reqid(entry->child_sa))
+		{
+			continue;
+		}
+		entry->pending = NULL;
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+}
+
+/**
+ * Implementation of listener_t.ike_state_change
+ */
+static bool ike_state_change(trap_listener_t *listener, ike_sa_t *ike_sa,
+							 ike_sa_state_t state)
+{
+	switch (state)
+	{
+		case IKE_DESTROYING:
+			complete(listener->traps, ike_sa, NULL);
+			return TRUE;
+		default:
+			return TRUE;
+	}
+}
+
+/**
+ * Implementation of listener_t.child_state_change
+ */
+static bool child_state_change(trap_listener_t *listener, ike_sa_t *ike_sa,
+							   child_sa_t *child_sa, child_sa_state_t state)
+{
+	switch (state)
+	{
+		case CHILD_INSTALLED:
+		case CHILD_DESTROYING:
+			complete(listener->traps, ike_sa, child_sa);
+			return TRUE;
+		default:
+			return TRUE;
+	}
+}
+
+/**
+ * Implementation of trap_manager_t.destroy.
+ */
+static void destroy(private_trap_manager_t *this)
+{
+	charon->bus->remove_listener(charon->bus, &this->listener.listener);
+	this->traps->invoke_function(this->traps, (void*)destroy_entry);
+	this->traps->destroy(this->traps);
+	this->lock->destroy(this->lock);
+	free(this);
+}
+
+/**
+ * See header
+ */
+trap_manager_t *trap_manager_create()
+{
+	private_trap_manager_t *this = malloc_thing(private_trap_manager_t);
+
+	this->public.install = (u_int(*)(trap_manager_t*, peer_cfg_t *peer, child_cfg_t *child))install;
+	this->public.uninstall = (bool(*)(trap_manager_t*, u_int32_t id))uninstall;
+	this->public.create_enumerator = (enumerator_t*(*)(trap_manager_t*))create_enumerator;
+	this->public.acquire = (void(*)(trap_manager_t*, u_int32_t reqid, traffic_selector_t *src, traffic_selector_t *dst))acquire;
+	this->public.destroy = (void(*)(trap_manager_t*))destroy;
+
+	this->traps = linked_list_create();
+	this->lock = rwlock_create(RWLOCK_TYPE_DEFAULT);
+
+	/* register listener for IKE state changes */
+	this->listener.traps = this;
+	memset(&this->listener.listener, 0, sizeof(listener_t));
+	this->listener.listener.ike_state_change = (void*)ike_state_change;
+	this->listener.listener.child_state_change = (void*)child_state_change;
+	charon->bus->add_listener(charon->bus, &this->listener.listener);
+
+	return &this->public;
+}
+
diff --git a/src/libcharon/sa/trap_manager.h b/src/libcharon/sa/trap_manager.h
new file mode 100644
index 000000000..37b42e2b0
--- /dev/null
+++ b/src/libcharon/sa/trap_manager.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2009 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup trap_manager trap_manager
+ * @{ @ingroup sa
+ */
+
+#ifndef TRAP_MANAGER_H_
+#define TRAP_MANAGER_H_
+
+#include <library.h>
+#include <utils/enumerator.h>
+#include <config/peer_cfg.h>
+
+typedef struct trap_manager_t trap_manager_t;
+
+/**
+ * Manage policies to create SAs from traffic.
+ */
+struct trap_manager_t {
+
+	/**
+	 * Install a policy as a trap.
+	 *
+	 * @param peer		peer configuration to initiate on trap
+	 * @param child 	child configuration to install as a trap
+	 * @return			reqid of installed CHILD_SA, 0 if failed
+	 */
+	u_int32_t (*install)(trap_manager_t *this, peer_cfg_t *peer,
+						 child_cfg_t *child);
+
+	/**
+	 * Uninstall a trap policy.
+	 *
+	 * @param id		reqid of CHILD_SA to uninstall, returned by install()
+	 * @return			TRUE if uninstalled successfully
+	 */
+	bool (*uninstall)(trap_manager_t *this, u_int32_t reqid);
+
+	/**
+	 * Create an enumerator over all installed traps.
+	 *
+	 * @return			enumerator over (peer_cfg_t, child_sa_t)
+	 */
+	enumerator_t* (*create_enumerator)(trap_manager_t *this);
+
+	/**
+	 * Acquire an SA triggered by an installed trap.
+	 *
+	 * @param reqid		requid of the triggering CHILD_SA
+	 * @param src		source of the triggering packet
+	 * @param dst		destination of the triggering packet
+	 */
+	void (*acquire)(trap_manager_t *this, u_int32_t reqid,
+					traffic_selector_t *src, traffic_selector_t *dst);
+
+	/**
+	 * Destroy a trap_manager_t.
+	 */
+	void (*destroy)(trap_manager_t *this);
+};
+
+/**
+ * Create a trap_manager instance.
+ */
+trap_manager_t *trap_manager_create();
+
+#endif /** TRAP_MANAGER_H_ @}*/