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

36 files changed, 9548 insertions, 0 deletions

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_ @}*/