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

1 files changed, 921 insertions, 0 deletions

diff --git a/src/libcharon/sa/ike_sa.h b/src/libcharon/sa/ike_sa.h
new file mode 100644
index 000000000..c61502edf
--- /dev/null
+++ b/src/libcharon/sa/ike_sa.h
@@ -0,0 +1,921 @@
+/*
+ * Copyright (C) 2006-2008 Tobias Brunner
+ * Copyright (C) 2006 Daniel Roethlisberger
+ * Copyright (C) 2005-2009 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup ike_sa ike_sa
+ * @{ @ingroup sa
+ */
+
+#ifndef IKE_SA_H_
+#define IKE_SA_H_
+
+typedef enum ike_extension_t ike_extension_t;
+typedef enum ike_condition_t ike_condition_t;
+typedef enum ike_sa_state_t ike_sa_state_t;
+typedef enum statistic_t statistic_t;
+typedef struct ike_sa_t ike_sa_t;
+
+#include <library.h>
+#include <attributes/attribute_handler.h>
+#include <encoding/message.h>
+#include <encoding/payloads/proposal_substructure.h>
+#include <encoding/payloads/configuration_attribute.h>
+#include <sa/ike_sa_id.h>
+#include <sa/child_sa.h>
+#include <sa/tasks/task.h>
+#include <sa/keymat.h>
+#include <config/peer_cfg.h>
+#include <config/ike_cfg.h>
+#include <config/auth_cfg.h>
+
+/**
+ * Timeout in seconds after that a half open IKE_SA gets deleted.
+ */
+#define HALF_OPEN_IKE_SA_TIMEOUT 30
+
+/**
+ * Interval to send keepalives when NATed, in seconds.
+ */
+#define KEEPALIVE_INTERVAL 20
+
+/**
+ * After which time rekeying should be retried if it failed, in seconds.
+ */
+#define RETRY_INTERVAL 30
+
+/**
+ * Jitter to subtract from RETRY_INTERVAL to randomize rekey retry.
+ */
+#define RETRY_JITTER 20
+
+/**
+ * Extensions (or optional features) the peer supports
+ */
+enum ike_extension_t {
+
+	/**
+	 * peer supports NAT traversal as specified in RFC4306
+	 */
+	EXT_NATT = (1<<0),
+
+	/**
+	 * peer supports MOBIKE (RFC4555)
+	 */
+	EXT_MOBIKE = (1<<1),
+
+	/**
+	 * peer supports HTTP cert lookups as specified in RFC4306
+	 */
+	EXT_HASH_AND_URL = (1<<2),
+
+	/**
+	 * peer supports multiple authentication exchanges, RFC4739
+	 */
+	EXT_MULTIPLE_AUTH = (1<<3),
+
+	/**
+	 * peer uses strongSwan, accept private use extensions
+	 */
+	EXT_STRONGSWAN = (1<<4),
+
+	/**
+	 * peer supports EAP-only authentication, draft-eronen-ipsec-ikev2-eap-auth
+	 */
+	EXT_EAP_ONLY_AUTHENTICATION = (1<<5),
+};
+
+/**
+ * Conditions of an IKE_SA, change during its lifetime
+ */
+enum ike_condition_t {
+
+	/**
+	 * Connection is natted (or faked) somewhere
+	 */
+	COND_NAT_ANY = (1<<0),
+
+	/**
+	 * we are behind NAT
+	 */
+	COND_NAT_HERE = (1<<1),
+
+	/**
+	 * other is behind NAT
+	 */
+	COND_NAT_THERE = (1<<2),
+
+	/**
+	 * Faking NAT to enforce UDP encapsulation
+	 */
+	COND_NAT_FAKE = (1<<3),
+
+	/**
+	 * peer has been authenticated using EAP at least once
+	 */
+	COND_EAP_AUTHENTICATED = (1<<4),
+
+	/**
+	 * received a certificate request from the peer
+	 */
+	COND_CERTREQ_SEEN = (1<<5),
+
+	/**
+	 * Local peer is the "original" IKE initiator. Unaffected from rekeying.
+	 */
+	COND_ORIGINAL_INITIATOR = (1<<6),
+
+	/**
+	 * IKE_SA is stale, the peer is currently unreachable (MOBIKE)
+	 */
+	COND_STALE = (1<<7),
+};
+
+/**
+ * Timing information and statistics to query from an SA
+ */
+enum statistic_t {
+	/** Timestamp of SA establishement */
+	STAT_ESTABLISHED = 0,
+	/** Timestamp of scheudled rekeying */
+	STAT_REKEY,
+	/** Timestamp of scheudled reauthentication */
+	STAT_REAUTH,
+	/** Timestamp of scheudled delete */
+	STAT_DELETE,
+	/** Timestamp of last inbound IKE packet */
+	STAT_INBOUND,
+	/** Timestamp of last outbound IKE packet */
+	STAT_OUTBOUND,
+
+	STAT_MAX
+};
+
+/**
+ * State of an IKE_SA.
+ *
+ * An IKE_SA passes various states in its lifetime. A newly created
+ * SA is in the state CREATED.
+ * @verbatim
+                 +----------------+
+                 ¦   SA_CREATED   ¦
+                 +----------------+
+                         ¦
+    on initiate()--->    ¦   <----- on IKE_SA_INIT received
+                         V
+                 +----------------+
+                 ¦ SA_CONNECTING  ¦
+                 +----------------+
+                         ¦
+                         ¦   <----- on IKE_AUTH successfully completed
+                         V
+                 +----------------+
+                 ¦ SA_ESTABLISHED ¦-------------------------+ <-- on rekeying
+                 +----------------+                         ¦
+                         ¦                                  V
+    on delete()--->      ¦   <----- on IKE_SA        +-------------+
+                         ¦          delete request   ¦ SA_REKEYING ¦
+                         ¦          received         +-------------+
+                         V                                  ¦
+                 +----------------+                         ¦
+                 ¦  SA_DELETING   ¦<------------------------+ <-- after rekeying
+                 +----------------+
+                         ¦
+                         ¦   <----- after delete() acknowledged
+                         ¦
+                        \V/
+                         X
+                        / \
+   @endverbatim
+ */
+enum ike_sa_state_t {
+
+	/**
+	 * IKE_SA just got created, but is not initiating nor responding yet.
+	 */
+	IKE_CREATED,
+
+	/**
+	 * IKE_SA gets initiated actively or passively
+	 */
+	IKE_CONNECTING,
+
+	/**
+	 * IKE_SA is fully established
+	 */
+	IKE_ESTABLISHED,
+
+	/**
+	 * IKE_SA is managed externally and does not process messages
+	 */
+	IKE_PASSIVE,
+
+	/**
+	 * IKE_SA rekeying in progress
+	 */
+	IKE_REKEYING,
+
+	/**
+	 * IKE_SA is in progress of deletion
+	 */
+	IKE_DELETING,
+
+	/**
+	 * IKE_SA object gets destroyed
+	 */
+	IKE_DESTROYING,
+};
+
+/**
+ * enum names for ike_sa_state_t.
+ */
+extern enum_name_t *ike_sa_state_names;
+
+/**
+ * Class ike_sa_t representing an IKE_SA.
+ *
+ * An IKE_SA contains crypto information related to a connection
+ * with a peer. It contains multiple IPsec CHILD_SA, for which
+ * it is responsible. All traffic is handled by an IKE_SA, using
+ * the task manager and its tasks.
+ */
+struct ike_sa_t {
+
+	/**
+	 * Get the id of the SA.
+	 *
+	 * Returned ike_sa_id_t object is not getting cloned!
+	 *
+	 * @return 				ike_sa's ike_sa_id_t
+	 */
+	ike_sa_id_t* (*get_id) (ike_sa_t *this);
+
+	/**
+	 * Get the numerical ID uniquely defining this IKE_SA.
+	 *
+	 * @return 				unique ID
+	 */
+	u_int32_t (*get_unique_id) (ike_sa_t *this);
+
+	/**
+	 * Get the state of the IKE_SA.
+	 *
+	 * @return				state of the IKE_SA
+	 */
+	ike_sa_state_t (*get_state) (ike_sa_t *this);
+
+	/**
+	 * Set the state of the IKE_SA.
+	 *
+	 * @param state			state to set for the IKE_SA
+	 */
+	void (*set_state) (ike_sa_t *this, ike_sa_state_t ike_sa);
+
+	/**
+	 * Get the name of the connection this IKE_SA uses.
+	 *
+	 * @return				name
+	 */
+	char* (*get_name) (ike_sa_t *this);
+
+	/**
+	 * Get statistic values from the IKE_SA.
+	 *
+	 * @param kind			kind of requested value
+	 * @return				value as integer
+	 */
+	u_int32_t (*get_statistic)(ike_sa_t *this, statistic_t kind);
+
+	/**
+	 * Get the own host address.
+	 *
+	 * @return				host address
+	 */
+	host_t* (*get_my_host) (ike_sa_t *this);
+
+	/**
+	 * Set the own host address.
+	 *
+	 * @param me			host address
+	 */
+	void (*set_my_host) (ike_sa_t *this, host_t *me);
+
+	/**
+	 * Get the other peers host address.
+	 *
+	 * @return				host address
+	 */
+	host_t* (*get_other_host) (ike_sa_t *this);
+
+	/**
+	 * Set the others host address.
+	 *
+	 * @param other			host address
+	 */
+	void (*set_other_host) (ike_sa_t *this, host_t *other);
+
+	/**
+	 * Update the IKE_SAs host.
+	 *
+	 * Hosts may be NULL to use current host.
+	 *
+	 * @param me			new local host address, or NULL
+	 * @param other			new remote host address, or NULL
+	 */
+	void (*update_hosts)(ike_sa_t *this, host_t *me, host_t *other);
+
+	/**
+	 * Get the own identification.
+	 *
+	 * @return				identification
+	 */
+	identification_t* (*get_my_id) (ike_sa_t *this);
+
+	/**
+	 * Set the own identification.
+	 *
+	 * @param me			identification
+	 */
+	void (*set_my_id) (ike_sa_t *this, identification_t *me);
+
+	/**
+	 * Get the other peer's identification.
+	 *
+	 * @return				identification
+	 */
+	identification_t* (*get_other_id) (ike_sa_t *this);
+
+	/**
+	 * Get the others peer identity, but prefer an EAP-Identity.
+	 *
+	 * @return				EAP or IKEv2 identity
+	 */
+	identification_t* (*get_other_eap_id)(ike_sa_t *this);
+
+	/**
+	 * Set the other peer's identification.
+	 *
+	 * @param other			identification
+	 */
+	void (*set_other_id) (ike_sa_t *this, identification_t *other);
+
+	/**
+	 * Get the config used to setup this IKE_SA.
+	 *
+	 * @return				ike_config
+	 */
+	ike_cfg_t* (*get_ike_cfg) (ike_sa_t *this);
+
+	/**
+	 * Set the config to setup this IKE_SA.
+	 *
+	 * @param config		ike_config to use
+	 */
+	void (*set_ike_cfg) (ike_sa_t *this, ike_cfg_t* config);
+
+	/**
+	 * Get the peer config used by this IKE_SA.
+	 *
+	 * @return				peer_config
+	 */
+	peer_cfg_t* (*get_peer_cfg) (ike_sa_t *this);
+
+	/**
+	 * Set the peer config to use with this IKE_SA.
+	 *
+	 * @param config		peer_config to use
+	 */
+	void (*set_peer_cfg) (ike_sa_t *this, peer_cfg_t *config);
+
+	/**
+	 * Get the authentication config with rules of the current auth round.
+	 *
+	 * @param local			TRUE for local rules, FALSE for remote constraints
+	 * @return				current cfg
+	 */
+	auth_cfg_t* (*get_auth_cfg)(ike_sa_t *this, bool local);
+
+	/**
+	 * Insert a completed authentication round.
+	 *
+	 * @param local			TRUE for own rules, FALSE for others constraints
+	 * @param cfg			auth config to append
+	 */
+	void (*add_auth_cfg)(ike_sa_t *this, bool local, auth_cfg_t *cfg);
+
+	/**
+	 * Create an enumerator over added authentication rounds.
+	 *
+	 * @param local			TRUE for own rules, FALSE for others constraints
+	 * @return				enumerator over auth_cfg_t
+	 */
+	enumerator_t* (*create_auth_cfg_enumerator)(ike_sa_t *this, bool local);
+
+	/**
+	 * Get the selected proposal of this IKE_SA.
+	 *
+	 * @return				selected proposal
+	 */
+	proposal_t* (*get_proposal)(ike_sa_t *this);
+
+	/**
+	 * Set the proposal selected for this IKE_SA.
+	 *
+	 * @param				selected proposal
+	 */
+	void (*set_proposal)(ike_sa_t *this, proposal_t *proposal);
+
+	/**
+	 * Set the message id of the IKE_SA.
+	 *
+	 * The IKE_SA stores two message IDs, one for initiating exchanges (send)
+	 * and one to respond to exchanges (expect).
+	 *
+	 * @param initiate		TRUE to set message ID for initiating
+	 * @param mid			message id to set
+	 */
+	void (*set_message_id)(ike_sa_t *this, bool initiate, u_int32_t mid);
+
+	/**
+	 * Add an additional address for the peer.
+	 *
+	 * In MOBIKE, a peer may transmit additional addresses where it is
+	 * reachable. These are stored in the IKE_SA.
+	 * The own list of addresses is not stored, they are queried from
+	 * the kernel when required.
+	 *
+	 * @param host			host to add to list
+	 */
+	void (*add_additional_address)(ike_sa_t *this, host_t *host);
+
+	/**
+	 * Create an iterator over all additional addresses of the peer.
+	 *
+	 * @return 				iterator over addresses
+	 */
+	iterator_t* (*create_additional_address_iterator)(ike_sa_t *this);
+
+	/**
+	 * Check if mappings have changed on a NAT for our source address.
+	 *
+	 * @param hash			received DESTINATION_IP hash
+	 * @return				TRUE if mappings have changed
+	 */
+	bool (*has_mapping_changed)(ike_sa_t *this, chunk_t hash);
+
+	/**
+	 * Enable an extension the peer supports.
+	 *
+	 * If support for an IKE extension is detected, this method is called
+	 * to enable that extension and behave accordingly.
+	 *
+	 * @param extension		extension to enable
+	 */
+	void (*enable_extension)(ike_sa_t *this, ike_extension_t extension);
+
+	/**
+	 * Check if the peer supports an extension.
+	 *
+	 * @param extension		extension to check for support
+	 * @return				TRUE if peer supports it, FALSE otherwise
+	 */
+	bool (*supports_extension)(ike_sa_t *this, ike_extension_t extension);
+
+	/**
+	 * Enable/disable a condition flag for this IKE_SA.
+	 *
+	 * @param condition		condition to enable/disable
+	 * @param enable		TRUE to enable condition, FALSE to disable
+	 */
+	void (*set_condition) (ike_sa_t *this, ike_condition_t condition, bool enable);
+
+	/**
+	 * Check if a condition flag is set.
+	 *
+	 * @param condition		condition to check
+	 * @return				TRUE if condition flag set, FALSE otherwise
+	 */
+	bool (*has_condition) (ike_sa_t *this, ike_condition_t condition);
+
+	/**
+	 * Get the number of queued MOBIKE address updates.
+	 *
+	 * @return				number of pending updates
+	 */
+	u_int32_t (*get_pending_updates)(ike_sa_t *this);
+
+	/**
+	 * Set the number of queued MOBIKE address updates.
+	 *
+	 * @param updates		number of pending updates
+	 */
+	void (*set_pending_updates)(ike_sa_t *this, u_int32_t updates);
+
+#ifdef ME
+	/**
+	 * Activate mediation server functionality for this IKE_SA.
+	 */
+	void (*act_as_mediation_server) (ike_sa_t *this);
+
+	/**
+	 * Get the server reflexive host.
+	 *
+	 * @return				server reflexive host
+	 */
+	host_t* (*get_server_reflexive_host) (ike_sa_t *this);
+
+	/**
+	 * Set the server reflexive host.
+	 *
+	 * @param host			server reflexive host
+	 */
+	void (*set_server_reflexive_host) (ike_sa_t *this, host_t *host);
+
+	/**
+	 * Get the connect ID.
+	 *
+	 * @return				connect ID
+	 */
+	chunk_t (*get_connect_id) (ike_sa_t *this);
+
+	/**
+	 * Initiate the mediation of a mediated connection (i.e. initiate a
+	 * ME_CONNECT exchange to a mediation server).
+	 *
+	 * @param mediated_cfg	peer_cfg of the mediated connection
+	 * @return
+	 * 						- SUCCESS if initialization started
+	 * 						- DESTROY_ME if initialization failed
+	 */
+	status_t (*initiate_mediation) (ike_sa_t *this, peer_cfg_t *mediated_cfg);
+
+	/**
+	 * Initiate the mediated connection
+	 *
+	 * @param me			local endpoint (gets cloned)
+	 * @param other			remote endpoint (gets cloned)
+	 * @param connect_id	connect ID (gets cloned)
+	 * @return
+	 * 						- SUCCESS if initialization started
+	 * 						- DESTROY_ME if initialization failed
+	 */
+	status_t (*initiate_mediated) (ike_sa_t *this, host_t *me, host_t *other,
+								   chunk_t connect_id);
+
+	/**
+	 * Relay data from one peer to another (i.e. initiate a ME_CONNECT exchange
+	 * to a peer).
+	 *
+	 * Data is cloned.
+	 *
+	 * @param requester		ID of the requesting peer
+	 * @param connect_id	data of the ME_CONNECTID payload
+	 * @param connect_key	data of the ME_CONNECTKEY payload
+	 * @param endpoints		endpoints
+	 * @param response		TRUE if this is a response
+	 * @return
+	 * 						- SUCCESS if relay started
+	 * 						- DESTROY_ME if relay failed
+	 */
+	status_t (*relay) (ike_sa_t *this, identification_t *requester,
+					   chunk_t connect_id, chunk_t connect_key,
+					   linked_list_t *endpoints, bool response);
+
+	/**
+	 * Send a callback to a peer.
+	 *
+	 * Data is cloned.
+	 *
+	 * @param peer_id		ID of the other peer
+	 * @return
+	 * 						- SUCCESS if response started
+	 * 						- DESTROY_ME if response failed
+	 */
+	status_t (*callback) (ike_sa_t *this, identification_t *peer_id);
+
+	/**
+	 * Respond to a ME_CONNECT request.
+	 *
+	 * Data is cloned.
+	 *
+	 * @param peer_id		ID of the other peer
+	 * @param connect_id	the connect ID supplied by the initiator
+	 * @return
+	 * 						- SUCCESS if response started
+	 * 						- DESTROY_ME if response failed
+	 */
+	status_t (*respond) (ike_sa_t *this, identification_t *peer_id,
+						 chunk_t connect_id);
+#endif /* ME */
+
+	/**
+	 * Initiate a new connection.
+	 *
+	 * The configs are owned by the IKE_SA after the call. If the initiate
+	 * is triggered by a packet, traffic selectors of the packet can be added
+	 * to the CHILD_SA.
+	 *
+	 * @param child_cfg		child config to create CHILD from
+	 * @param reqid			reqid to use for CHILD_SA, 0 assigne uniquely
+	 * @param tsi			source of triggering packet
+	 * @param tsr			destination of triggering packet.
+	 * @return
+	 * 						- SUCCESS if initialization started
+	 * 						- DESTROY_ME if initialization failed
+	 */
+	status_t (*initiate) (ike_sa_t *this, child_cfg_t *child_cfg,
+						  u_int32_t reqid, traffic_selector_t *tsi,
+						  traffic_selector_t *tsr);
+
+	/**
+	 * Initiates the deletion of an IKE_SA.
+	 *
+	 * Sends a delete message to the remote peer and waits for
+	 * its response. If the response comes in, or a timeout occurs,
+	 * the IKE SA gets deleted.
+	 *
+	 * @return
+	 * 						- SUCCESS if deletion is initialized
+	 * 						- DESTROY_ME, if the IKE_SA is not in
+	 * 						  an established state and can not be
+	 * 						  deleted (but destroyed).
+	 */
+	status_t (*delete) (ike_sa_t *this);
+
+	/**
+	 * Update IKE_SAs after network interfaces have changed.
+	 *
+	 * Whenever the network interface configuration changes, the kernel
+	 * interface calls roam() on each IKE_SA. The IKE_SA then checks if
+	 * the new network config requires changes, and handles appropriate.
+	 * If MOBIKE is supported, addresses are updated; If not, the tunnel is
+	 * restarted.
+	 *
+	 * @param address		TRUE if address list changed, FALSE otherwise
+	 * @return				SUCCESS, FAILED, DESTROY_ME
+	 */
+	status_t (*roam)(ike_sa_t *this, bool address);
+
+	/**
+	 * Processes a incoming IKEv2-Message.
+	 *
+	 * Message processing may fail. If a critical failure occurs,
+	 * process_message() return DESTROY_ME. Then the caller must
+	 * destroy the IKE_SA immediatly, as it is unusable.
+	 *
+	 * @param message 		message to process
+	 * @return
+	 * 						- SUCCESS
+	 * 						- FAILED
+	 * 						- DESTROY_ME if this IKE_SA MUST be deleted
+	 */
+	status_t (*process_message) (ike_sa_t *this, message_t *message);
+
+	/**
+	 * Generate a IKE message to send it to the peer.
+	 *
+	 * This method generates all payloads in the message and encrypts/signs
+	 * the packet.
+	 *
+	 * @param message 		message to generate
+	 * @param packet		generated output packet
+	 * @return
+	 * 						- SUCCESS
+	 * 						- FAILED
+	 * 						- DESTROY_ME if this IKE_SA MUST be deleted
+	 */
+	status_t (*generate_message) (ike_sa_t *this, message_t *message,
+								  packet_t **packet);
+
+	/**
+	 * Retransmits a request.
+	 *
+	 * @param message_id	ID of the request to retransmit
+	 * @return
+	 * 						- SUCCESS
+	 * 						- NOT_FOUND if request doesn't have to be retransmited
+	 */
+	status_t (*retransmit) (ike_sa_t *this, u_int32_t message_id);
+
+	/**
+	 * Sends a DPD request to the peer.
+	 *
+	 * To check if a peer is still alive, periodic
+	 * empty INFORMATIONAL messages are sent if no
+	 * other traffic was received.
+	 *
+	 * @return
+	 * 						- SUCCESS
+	 * 						- DESTROY_ME, if peer did not respond
+	 */
+	status_t (*send_dpd) (ike_sa_t *this);
+
+	/**
+	 * Sends a keep alive packet.
+	 *
+	 * To refresh NAT tables in a NAT router
+	 * between the peers, periodic empty
+	 * UDP packets are sent if no other traffic
+	 * was sent.
+	 */
+	void (*send_keepalive) (ike_sa_t *this);
+
+	/**
+	 * Get the keying material of this IKE_SA.
+	 *
+	 * @return				per IKE_SA keymat instance
+	 */
+	keymat_t* (*get_keymat)(ike_sa_t *this);
+
+	/**
+	 * Associates a child SA to this IKE SA
+	 *
+	 * @param child_sa		child_sa to add
+	 */
+	void (*add_child_sa) (ike_sa_t *this, child_sa_t *child_sa);
+
+	/**
+	 * Get a CHILD_SA identified by protocol and SPI.
+	 *
+	 * @param protocol		protocol of the SA
+	 * @param spi			SPI of the CHILD_SA
+	 * @param inbound		TRUE if SPI is inbound, FALSE if outbound
+	 * @return				child_sa, or NULL if none found
+	 */
+	child_sa_t* (*get_child_sa) (ike_sa_t *this, protocol_id_t protocol,
+								 u_int32_t spi, bool inbound);
+
+	/**
+	 * Create an iterator over all CHILD_SAs.
+	 *
+	 * @return				iterator
+	 */
+	iterator_t* (*create_child_sa_iterator) (ike_sa_t *this);
+
+	/**
+	 * Rekey the CHILD SA with the specified reqid.
+	 *
+	 * Looks for a CHILD SA owned by this IKE_SA, and start the rekeing.
+	 *
+	 * @param protocol		protocol of the SA
+	 * @param spi			inbound SPI of the CHILD_SA
+	 * @return
+	 * 						- NOT_FOUND, if IKE_SA has no such CHILD_SA
+	 * 						- SUCCESS, if rekeying initiated
+	 */
+	status_t (*rekey_child_sa) (ike_sa_t *this, protocol_id_t protocol, u_int32_t spi);
+
+	/**
+	 * Close the CHILD SA with the specified protocol/SPI.
+	 *
+	 * Looks for a CHILD SA owned by this IKE_SA, deletes it and
+	 * notify's the remote peer about the delete. The associated
+	 * states and policies in the kernel get deleted, if they exist.
+	 *
+	 * @param protocol		protocol of the SA
+	 * @param spi			inbound SPI of the CHILD_SA
+	 * @return
+	 * 						- NOT_FOUND, if IKE_SA has no such CHILD_SA
+	 * 						- SUCCESS, if delete message sent
+	 */
+	status_t (*delete_child_sa) (ike_sa_t *this, protocol_id_t protocol, u_int32_t spi);
+
+	/**
+	 * Destroy a CHILD SA with the specified protocol/SPI.
+	 *
+	 * Looks for a CHILD SA owned by this IKE_SA and destroys it.
+	 *
+	 * @param protocol		protocol of the SA
+	 * @param spi			inbound SPI of the CHILD_SA
+	 * @return
+	 * 						- NOT_FOUND, if IKE_SA has no such CHILD_SA
+	 * 						- SUCCESS
+	 */
+	status_t (*destroy_child_sa) (ike_sa_t *this, protocol_id_t protocol, u_int32_t spi);
+
+	/**
+	 * Rekey the IKE_SA.
+	 *
+	 * Sets up a new IKE_SA, moves all CHILDs to it and deletes this IKE_SA.
+	 *
+	 * @return				- SUCCESS, if IKE_SA rekeying initiated
+	 */
+	status_t (*rekey) (ike_sa_t *this);
+
+	/**
+	 * Reauthenticate the IKE_SA.
+	 *
+	 * Create a completely new IKE_SA with authentication, recreates all children
+	 * within the IKE_SA, closes this IKE_SA.
+	 *
+	 * @return				DESTROY_ME to destroy the IKE_SA
+	 */
+	status_t (*reauth) (ike_sa_t *this);
+
+	/**
+	 * Restablish the IKE_SA.
+	 *
+	 * Reestablish an IKE_SA after it has been closed.
+	 *
+	 * @return				DESTROY_ME to destroy the IKE_SA
+	 */
+	status_t (*reestablish) (ike_sa_t *this);
+
+	/**
+	 * Set the lifetime limit received from a AUTH_LIFETIME notify.
+	 *
+	 * @param lifetime		lifetime in seconds
+	 */
+	void (*set_auth_lifetime)(ike_sa_t *this, u_int32_t lifetime);
+
+	/**
+	 * Set the virtual IP to use for this IKE_SA and its children.
+	 *
+	 * The virtual IP is assigned per IKE_SA, not per CHILD_SA. It has the same
+	 * lifetime as the IKE_SA.
+	 *
+	 * @param local			TRUE to set local address, FALSE for remote
+	 * @param ip			IP to set as virtual IP
+	 */
+	void (*set_virtual_ip) (ike_sa_t *this, bool local, host_t *ip);
+
+	/**
+	 * Get the virtual IP configured.
+	 *
+	 * @param local			TRUE to get local virtual IP, FALSE for remote
+	 * @return				host_t *virtual IP
+	 */
+	host_t* (*get_virtual_ip) (ike_sa_t *this, bool local);
+
+	/**
+	 * Register a configuration attribute to the IKE_SA.
+	 *
+	 * If an IRAS sends a configuration attribute it is installed and
+	 * registered at the IKE_SA. Attributes are inherit()ed and get released
+	 * when the IKE_SA is closed.
+	 *
+	 * @param handler		handler installed the attribute, use for release()
+	 * @param type			configuration attribute type
+	 * @param data			associated attribute data
+	 */
+	void (*add_configuration_attribute)(ike_sa_t *this,
+							attribute_handler_t *handler,
+							configuration_attribute_type_t type, chunk_t data);
+
+	/**
+	 * Set local and remote host addresses to be used for IKE.
+	 *
+	 * These addresses are communicated via the KMADDRESS field of a MIGRATE
+	 * message sent via the NETLINK or PF _KEY kernel socket interface.
+	 *
+	 * @param local			local kmaddress
+	 * @param remote		remote kmaddress
+	 */
+	void (*set_kmaddress) (ike_sa_t *this, host_t *local, host_t *remote);
+
+	/**
+	 * Inherit all attributes of other to this after rekeying.
+	 *
+	 * When rekeying is completed, all CHILD_SAs, the virtual IP and all
+	 * outstanding tasks are moved from other to this.
+	 * As this call may initiate inherited tasks, a status is returned.
+	 *
+	 * @param other			other task to inherit from
+	 * @return				DESTROY_ME if initiation of inherited task failed
+	 */
+	status_t (*inherit) (ike_sa_t *this, ike_sa_t *other);
+
+	/**
+	 * Reset the IKE_SA, useable when initiating fails
+	 */
+	void (*reset) (ike_sa_t *this);
+
+	/**
+	 * Destroys a ike_sa_t object.
+	 */
+	void (*destroy) (ike_sa_t *this);
+};
+
+/**
+ * Creates an ike_sa_t object with a specific ID.
+ *
+ * @param ike_sa_id 	ike_sa_id_t object to associate with new IKE_SA
+ * @return 				ike_sa_t object
+ */
+ike_sa_t *ike_sa_create(ike_sa_id_t *ike_sa_id);
+
+#endif /** IKE_SA_H_ @}*/