[thirdparty/strongswan.git] / src / charon / sa / tasks / ike_mobike.c

/*
 * 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.
 *
 * $Id$
 */

#include "ike_mobike.h"

#include <string.h>

#include <daemon.h>
#include <sa/tasks/ike_natd.h>
#include <encoding/payloads/notify_payload.h>


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)
{
	iterator_t *iterator;
	payload_t *payload;
	bool first = TRUE;
	
	iterator = message->get_payload_iterator(message);
	while (iterator->iterate(iterator, (void**)&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:
			{
				DBG1(DBG_IKE, "peer supports MOBIKE");
				this->ike_sa->enable_extension(this->ike_sa, EXT_MOBIKE);
				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;
		}
	}
	iterator->destroy(iterator);
}

/**
 * Add ADDITIONAL_*_ADDRESS notifys depending on our address list
 */
static void build_address_list(private_ike_mobike_t *this, message_t *message)
{
	iterator_t *iterator;
	host_t *host, *me;
	notify_type_t type;
	bool additional = FALSE;

	me = this->ike_sa->get_my_host(this->ike_sa);
	iterator = charon->kernel_interface->create_address_iterator(
												charon->kernel_interface);
	while (iterator->iterate(iterator, (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));
		additional = TRUE;
	}
	if (!additional)
	{
		message->add_notify(message, FALSE, NO_ADDITIONAL_ADDRESSES, chunk_empty);
	}
	iterator->destroy(iterator);
}

/**
 * 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))
	{
		child_sa->update_hosts(child_sa,
						this->ike_sa->get_my_host(this->ike_sa), 
						this->ike_sa->get_other_host(this->ike_sa),
						this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY));
	}
	iterator->destroy(iterator);
}

/**
 * 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;
	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);
	
	me = charon->kernel_interface->get_source_addr(
										charon->kernel_interface, other_old);
	if (me)
	{
		me->set_port(me, me->ip_equals(me, me_old) ?
					 me_old->get_port(me_old) : IKEV2_NATT_PORT);
		packet->set_source(packet, me);
	}
	
	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);
		if (me)
		{
			/* reuse port for an active address, 4500 otherwise */
			me->set_port(me, me->ip_equals(me, me_old) ?
						 me_old->get_port(me_old) : IKEV2_NATT_PORT);
			other = other->clone(other);
			other->set_port(other, other->ip_equals(other, other_old) ?
							other_old->get_port(other_old) : IKEV2_NATT_PORT);
			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);
	me = packet->get_source(packet);
	other = packet->get_destination(packet);
	DBG1(DBG_IKE, "checking path %#H - %#H", me, other);
}

/**
 * Implementation of task_t.process for initiator
 */
static status_t build_i(private_ike_mobike_t *this, message_t *message)
{
	if (message->get_exchange_type(message) == IKE_AUTH &&
		message->get_payload(message, ID_INITIATOR))
	{
		message->add_notify(message, FALSE, MOBIKE_SUPPORTED, chunk_empty);
		build_address_list(this, message);
	}
	else if (message->get_exchange_type(message) == INFORMATIONAL)
	{
		if (this->update)
		{
			message->add_notify(message, FALSE, UPDATE_SA_ADDRESSES, chunk_empty);
			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_exchange_type(message) == IKE_AUTH &&
		message->get_payload(message, ID_INITIATOR))
	{
		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->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;
		}
		process_payloads(this, message);
		if (this->natd)
		{
			this->natd->task.process(&this->natd->task, message);
		}
		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;
				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.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.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;
}
Commit	Line	Data
17d92e97 MW	1	/*
	2	* Copyright (C) 2007 Martin Willi
	3	* Hochschule fuer Technik Rapperswil
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the
	7	* Free Software Foundation; either version 2 of the License, or (at your
	8	* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
	9	*
	10	* This program is distributed in the hope that it will be useful, but
	11	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	12	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	13	* for more details.
552cc11b MW	14	*
552cc11b MW	15	* $Id$
17d92e97 MW	16	*/
	17
	18	#include "ike_mobike.h"
	19
	20	#include <string.h>
	21
	22	#include <daemon.h>
4cb9d7a7	23	#include <sa/tasks/ike_natd.h>
17d92e97 MW	24	#include <encoding/payloads/notify_payload.h>
	25
	26
	27	typedef struct private_ike_mobike_t private_ike_mobike_t;
	28
	29	/**
	30	* Private members of a ike_mobike_t task.
	31	*/
	32	struct private_ike_mobike_t {
	33
	34	/**
	35	* Public methods and task_t interface.
	36	*/
	37	ike_mobike_t public;
	38
	39	/**
	40	* Assigned IKE_SA.
	41	*/
	42	ike_sa_t *ike_sa;
	43
	44	/**
	45	* Are we the initiator?
	46	*/
	47	bool initiator;
	48
	49	/**
3bc62fe7	50	* cookie2 value to verify new addresses
17d92e97	51	*/
3bc62fe7	52	chunk_t cookie2;
17d92e97 MW	53
17d92e97 MW	54	/**
3bc62fe7	55	* NAT discovery reusing the IKE_NATD task
17d92e97	56	*/
3bc62fe7	57	ike_natd_t *natd;
4cb9d7a7 MW	58
4cb9d7a7 MW	59	/**
3bc62fe7	60	* use task to update addresses
4cb9d7a7	61	*/
5474dc65 MW	62	bool update;
	63
	64	/**
	65	* do routability check
	66	*/
	67	bool check;
4cb9d7a7 MW	68
4cb9d7a7 MW	69	/**
3bc62fe7	70	* include address list update
4cb9d7a7	71	*/
3bc62fe7	72	bool address;
17d92e97 MW	73	};
	74
	75	/**
	76	* flush the IKE_SAs list of additional addresses
	77	*/
	78	static void flush_additional_addresses(private_ike_mobike_t *this)
	79	{
	80	iterator_t *iterator;
	81	host_t *host;
	82
	83	iterator = this->ike_sa->create_additional_address_iterator(this->ike_sa);
	84	while (iterator->iterate(iterator, (void**)&host))
	85	{
	86	iterator->remove(iterator);
	87	host->destroy(host);
	88	}
	89	iterator->destroy(iterator);
	90	}
	91
	92
	93	/**
	94	* read notifys from message and evaluate them
	95	*/
	96	static void process_payloads(private_ike_mobike_t this, message_t message)
	97	{
	98	iterator_t *iterator;
	99	payload_t *payload;
	100	bool first = TRUE;
	101
	102	iterator = message->get_payload_iterator(message);
	103	while (iterator->iterate(iterator, (void**)&payload))
	104	{
	105	int family = AF_INET;
	106	notify_payload_t *notify;
	107	chunk_t data;
	108	host_t *host;
	109
	110	if (payload->get_type(payload) != NOTIFY)
	111	{
	112	continue;
	113	}
	114	notify = (notify_payload_t*)payload;
	115	switch (notify->get_notify_type(notify))
	116	{
	117	case MOBIKE_SUPPORTED:
	118	{
bcac22f3	119	DBG1(DBG_IKE, "peer supports MOBIKE");
17d92e97 MW	120	this->ike_sa->enable_extension(this->ike_sa, EXT_MOBIKE);
	121	break;
	122	}
	123	case ADDITIONAL_IP6_ADDRESS:
	124	{
	125	family = AF_INET6;
	126	/* fall through */
	127	}
	128	case ADDITIONAL_IP4_ADDRESS:
	129	{
	130	if (first)
	131	{ /* an ADDITIONAL__ADDRESS means replace, so flush once /
	132	flush_additional_addresses(this);
4cb9d7a7	133	first = FALSE;
17d92e97 MW	134	}
	135	data = notify->get_notification_data(notify);
	136	host = host_create_from_chunk(family, data, 0);
	137	DBG2(DBG_IKE, "got additional MOBIKE peer address: %H", host);
	138	this->ike_sa->add_additional_address(this->ike_sa, host);
	139	break;
	140	}
3bc62fe7 MW	141	case UPDATE_SA_ADDRESSES:
3bc62fe7 MW	142	{
5474dc65	143	this->update = TRUE;
3bc62fe7 MW	144	break;
3bc62fe7 MW	145	}
17d92e97 MW	146	case NO_ADDITIONAL_ADDRESSES:
	147	{
	148	flush_additional_addresses(this);
	149	break;
	150	}
fc2d1c42 MW	151	case NAT_DETECTION_SOURCE_IP:
	152	case NAT_DETECTION_DESTINATION_IP:
	153	{
	154	/* NAT check in this MOBIKE exchange, create subtask for it */
	155	if (this->natd == NULL)
	156	{
	157	this->natd = ike_natd_create(this->ike_sa, this->initiator);
	158	}
	159	break;
	160	}
17d92e97 MW	161	default:
	162	break;
	163	}
	164	}
	165	iterator->destroy(iterator);
	166	}
	167
	168	/**
	169	* Add ADDITIONAL_*_ADDRESS notifys depending on our address list
	170	*/
	171	static void build_address_list(private_ike_mobike_t this, message_t message)
	172	{
	173	iterator_t *iterator;
	174	host_t host, me;
	175	notify_type_t type;
	176	bool additional = FALSE;
	177
	178	me = this->ike_sa->get_my_host(this->ike_sa);
	179	iterator = charon->kernel_interface->create_address_iterator(
	180	charon->kernel_interface);
	181	while (iterator->iterate(iterator, (void**)&host))
	182	{
	183	if (me->ip_equals(me, host))
	184	{ /* "ADDITIONAL" means do not include IKE_SAs host */
	185	continue;
	186	}
	187	switch (host->get_family(host))
	188	{
	189	case AF_INET:
	190	type = ADDITIONAL_IP4_ADDRESS;
	191	break;
	192	case AF_INET6:
	193	type = ADDITIONAL_IP6_ADDRESS;
	194	break;
	195	default:
	196	continue;
	197	}
	198	message->add_notify(message, FALSE, type, host->get_address(host));
	199	additional = TRUE;
	200	}
	201	if (!additional)
	202	{
	203	message->add_notify(message, FALSE, NO_ADDITIONAL_ADDRESSES, chunk_empty);
	204	}
	205	iterator->destroy(iterator);
	206	}
	207
3bc62fe7 MW	208	/**
	209	* update addresses of associated CHILD_SAs
	210	*/
	211	static void update_children(private_ike_mobike_t *this)
	212	{
	213	iterator_t *iterator;
	214	child_sa_t *child_sa;
	215
	216	iterator = this->ike_sa->create_child_sa_iterator(this->ike_sa);
	217	while (iterator->iterate(iterator, (void**)&child_sa))
	218	{
	219	child_sa->update_hosts(child_sa,
	220	this->ike_sa->get_my_host(this->ike_sa),
	221	this->ike_sa->get_other_host(this->ike_sa),
	222	this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY));
	223	}
	224	iterator->destroy(iterator);
	225	}
	226
5474dc65 MW	227	/**
	228	* Implementation of ike_mobike_t.transmit
	229	*/
	230	static void transmit(private_ike_mobike_t this, packet_t packet)
	231	{
	232	host_t me, other, me_old, other_old;
	233	iterator_t *iterator;
	234	packet_t *copy;
	235
	236	if (!this->check)
	237	{
	238	return;
	239	}
	240
	241	me_old = this->ike_sa->get_my_host(this->ike_sa);
	242	other_old = this->ike_sa->get_other_host(this->ike_sa);
	243
	244	me = charon->kernel_interface->get_source_addr(
	245	charon->kernel_interface, other_old);
	246	if (me)
	247	{
	248	me->set_port(me, me->ip_equals(me, me_old) ?
	249	me_old->get_port(me_old) : IKEV2_NATT_PORT);
	250	packet->set_source(packet, me);
	251	}
	252
	253	iterator = this->ike_sa->create_additional_address_iterator(this->ike_sa);
	254	while (iterator->iterate(iterator, (void**)&other))
	255	{
	256	me = charon->kernel_interface->get_source_addr(
	257	charon->kernel_interface, other);
	258	if (me)
	259	{
	260	/* reuse port for an active address, 4500 otherwise */
	261	me->set_port(me, me->ip_equals(me, me_old) ?
	262	me_old->get_port(me_old) : IKEV2_NATT_PORT);
	263	other = other->clone(other);
	264	other->set_port(other, other->ip_equals(other, other_old) ?
	265	other_old->get_port(other_old) : IKEV2_NATT_PORT);
d9d69536	266	DBG1(DBG_IKE, "checking path %#H - %#H", me, other);
5474dc65 MW	267	copy = packet->clone(packet);
	268	copy->set_source(copy, me);
	269	copy->set_destination(copy, other);
	270	charon->sender->send(charon->sender, copy);
	271	}
	272	}
	273	iterator->destroy(iterator);
d9d69536 MW	274	me = packet->get_source(packet);
	275	other = packet->get_destination(packet);
	276	DBG1(DBG_IKE, "checking path %#H - %#H", me, other);
5474dc65 MW	277	}
5474dc65 MW	278
17d92e97 MW	279	/**
	280	* Implementation of task_t.process for initiator
	281	*/
	282	static status_t build_i(private_ike_mobike_t this, message_t message)
	283	{
	284	if (message->get_exchange_type(message) == IKE_AUTH &&
b8249ff5	285	message->get_payload(message, ID_INITIATOR))
4cb9d7a7	286	{
17d92e97 MW	287	message->add_notify(message, FALSE, MOBIKE_SUPPORTED, chunk_empty);
	288	build_address_list(this, message);
	289	}
c8739590	290	else if (message->get_exchange_type(message) == INFORMATIONAL)
3bc62fe7	291	{
5474dc65	292	if (this->update)
fc2d1c42	293	{
3bc62fe7	294	message->add_notify(message, FALSE, UPDATE_SA_ADDRESSES, chunk_empty);
5474dc65	295	update_children(this);
fc2d1c42	296	}
3bc62fe7 MW	297	if (this->address)
	298	{
	299	build_address_list(this, message);
	300	}
5474dc65 MW	301	if (this->natd)
	302	{
	303	this->natd->task.build(&this->natd->task, message);
	304	}
4cb9d7a7	305	}
17d92e97 MW	306	return NEED_MORE;
	307	}
	308
	309	/**
	310	* Implementation of task_t.process for responder
	311	*/
	312	static status_t process_r(private_ike_mobike_t this, message_t message)
4cb9d7a7	313	{
fc2d1c42	314	if (message->get_exchange_type(message) == IKE_AUTH &&
b8249ff5	315	message->get_payload(message, ID_INITIATOR))
4cb9d7a7 MW	316	{
	317	process_payloads(this, message);
	318	}
fc2d1c42 MW	319	else if (message->get_exchange_type(message) == INFORMATIONAL)
	320	{
	321	process_payloads(this, message);
5474dc65	322	if (this->update)
3bc62fe7 MW	323	{
	324	host_t me, other;
	325
	326	me = message->get_destination(message);
	327	other = message->get_source(message);
	328	this->ike_sa->set_my_host(this->ike_sa, me->clone(me));
	329	this->ike_sa->set_other_host(this->ike_sa, other->clone(other));
	330	}
	331
fc2d1c42 MW	332	if (this->natd)
	333	{
	334	this->natd->task.process(&this->natd->task, message);
	335	}
	336	}
17d92e97 MW	337	return NEED_MORE;
	338	}
	339
	340	/**
	341	* Implementation of task_t.build for responder
	342	*/
	343	static status_t build_r(private_ike_mobike_t this, message_t message)
	344	{
	345	if (message->get_exchange_type(message) == IKE_AUTH &&
b8249ff5	346	this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
17d92e97 MW	347	{
	348	if (this->ike_sa->supports_extension(this->ike_sa, EXT_MOBIKE))
	349	{
	350	message->add_notify(message, FALSE, MOBIKE_SUPPORTED, chunk_empty);
	351	build_address_list(this, message);
	352	}
	353	return SUCCESS;
	354	}
2b3100b5 MW	355	else if (message->get_exchange_type(message) == INFORMATIONAL)
2b3100b5 MW	356	{
fc2d1c42 MW	357	if (this->natd)
	358	{
	359	this->natd->task.build(&this->natd->task, message);
	360	}
5474dc65	361	if (this->update)
3bc62fe7 MW	362	{
	363	update_children(this);
	364	}
2b3100b5 MW	365	return SUCCESS;
2b3100b5 MW	366	}
17d92e97 MW	367	return NEED_MORE;
	368	}
	369
	370	/**
	371	* Implementation of task_t.process for initiator
	372	*/
	373	static status_t process_i(private_ike_mobike_t this, message_t message)
	374	{
	375	if (message->get_exchange_type(message) == IKE_AUTH &&
b8249ff5	376	this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
17d92e97 MW	377	{
	378	process_payloads(this, message);
	379	return SUCCESS;
	380	}
2b3100b5 MW	381	else if (message->get_exchange_type(message) == INFORMATIONAL)
2b3100b5 MW	382	{
3bc62fe7 MW	383	u_int32_t updates = this->ike_sa->get_pending_updates(this->ike_sa) - 1;
	384	this->ike_sa->set_pending_updates(this->ike_sa, updates);
	385	if (updates > 0)
	386	{
	387	/* newer update queued, ignore this one */
	388	return SUCCESS;
	389	}
fc2d1c42 MW	390	process_payloads(this, message);
	391	if (this->natd)
	392	{
	393	this->natd->task.process(&this->natd->task, message);
	394	}
5474dc65	395	if (this->update)
3bc62fe7 MW	396	{
	397	/* update again, as NAT state may have changed */
	398	update_children(this);
	399	}
5474dc65 MW	400	if (this->check)
	401	{
	402	host_t me_new, me_old, other_new, other_old;
	403
	404	me_new = message->get_destination(message);
	405	other_new = message->get_source(message);
	406	me_old = this->ike_sa->get_my_host(this->ike_sa);
	407	other_old = this->ike_sa->get_other_host(this->ike_sa);
	408
	409	if (!me_new->equals(me_new, me_old))
	410	{
	411	this->update = TRUE;
	412	this->ike_sa->set_my_host(this->ike_sa, me_new->clone(me_new));
	413	}
	414	if (!other_new->equals(other_new, other_old))
	415	{
	416	this->update = TRUE;
	417	this->ike_sa->set_other_host(this->ike_sa, other_new->clone(other_new));
	418	}
	419	if (this->update)
	420	{
	421	/* start the update with the same task */
	422	this->check = FALSE;
	423	this->address = FALSE;
12fa4387	424	this->natd = ike_natd_create(this->ike_sa, this->initiator);
5474dc65 MW	425	this->ike_sa->set_pending_updates(this->ike_sa, 1);
	426	return NEED_MORE;
	427	}
	428	}
2b3100b5 MW	429	return SUCCESS;
2b3100b5 MW	430	}
17d92e97 MW	431	return NEED_MORE;
	432	}
	433
	434	/**
	435	* Implementation of ike_mobike_t.roam.
	436	*/
3bc62fe7	437	static void roam(private_ike_mobike_t *this, bool address)
17d92e97	438	{
5474dc65	439	this->check = TRUE;
3bc62fe7 MW	440	this->address = address;
	441	this->ike_sa->set_pending_updates(this->ike_sa,
	442	this->ike_sa->get_pending_updates(this->ike_sa) + 1);
17d92e97 MW	443	}
17d92e97 MW	444
f215e919 MW	445	/**
	446	* Implementation of ike_mobike_t.is_probing.
	447	*/
	448	static bool is_probing(private_ike_mobike_t *this)
	449	{
	450	return this->check;
	451	}
	452
17d92e97 MW	453	/**
	454	* Implementation of task_t.get_type
	455	*/
	456	static task_type_t get_type(private_ike_mobike_t *this)
	457	{
	458	return IKE_MOBIKE;
	459	}
	460
	461	/**
	462	* Implementation of task_t.migrate
	463	*/
	464	static void migrate(private_ike_mobike_t this, ike_sa_t ike_sa)
	465	{
4cb9d7a7	466	chunk_free(&this->cookie2);
17d92e97	467	this->ike_sa = ike_sa;
4cb9d7a7 MW	468	if (this->natd)
	469	{
	470	this->natd->task.migrate(&this->natd->task, ike_sa);
	471	}
17d92e97 MW	472	}
	473
	474	/**
	475	* Implementation of task_t.destroy
	476	*/
	477	static void destroy(private_ike_mobike_t *this)
	478	{
4cb9d7a7 MW	479	chunk_free(&this->cookie2);
	480	if (this->natd)
	481	{
	482	this->natd->task.destroy(&this->natd->task);
	483	}
17d92e97 MW	484	free(this);
	485	}
	486
	487	/*
	488	* Described in header.
	489	*/
	490	ike_mobike_t ike_mobike_create(ike_sa_t ike_sa, bool initiator)
	491	{
	492	private_ike_mobike_t *this = malloc_thing(private_ike_mobike_t);
	493
3bc62fe7	494	this->public.roam = (void()(ike_mobike_t,bool))roam;
5474dc65	495	this->public.transmit = (void()(ike_mobike_t,packet_t*))transmit;
f215e919	496	this->public.is_probing = (bool()(ike_mobike_t))is_probing;
17d92e97 MW	497	this->public.task.get_type = (task_type_t()(task_t))get_type;
	498	this->public.task.migrate = (void()(task_t,ike_sa_t*))migrate;
	499	this->public.task.destroy = (void()(task_t))destroy;
	500
	501	if (initiator)
	502	{
	503	this->public.task.build = (status_t()(task_t,message_t*))build_i;
	504	this->public.task.process = (status_t()(task_t,message_t*))process_i;
	505	}
	506	else
	507	{
	508	this->public.task.build = (status_t()(task_t,message_t*))build_r;
	509	this->public.task.process = (status_t()(task_t,message_t*))process_r;
	510	}
	511
	512	this->ike_sa = ike_sa;
	513	this->initiator = initiator;
5474dc65 MW	514	this->update = FALSE;
5474dc65 MW	515	this->check = FALSE;
3bc62fe7	516	this->address = TRUE;
4cb9d7a7 MW	517	this->cookie2 = chunk_empty;
4cb9d7a7 MW	518	this->natd = NULL;
17d92e97 MW	519
	520	return &this->public;
	521	}
	522