Moving charon to libcharon.
This commit is contained in:
Tobias Brunner
@@ -0,0 +1,659 @@
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/*
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* Copyright (C) 2007 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "ike_mobike.h"
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#include <string.h>
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#include <daemon.h>
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#include <sa/tasks/ike_natd.h>
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#include <encoding/payloads/notify_payload.h>
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#define COOKIE2_SIZE 16
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#define MAX_ADDITIONAL_ADDRS 8
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typedef struct private_ike_mobike_t private_ike_mobike_t;
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/**
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* Private members of a ike_mobike_t task.
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*/
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struct private_ike_mobike_t {
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/**
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* Public methods and task_t interface.
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*/
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ike_mobike_t public;
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/**
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* Assigned IKE_SA.
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*/
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ike_sa_t *ike_sa;
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/**
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* Are we the initiator?
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*/
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bool initiator;
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/**
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* cookie2 value to verify new addresses
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*/
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chunk_t cookie2;
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/**
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* NAT discovery reusing the IKE_NATD task
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*/
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ike_natd_t *natd;
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/**
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* use task to update addresses
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*/
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bool update;
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/**
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* do routability check
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*/
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bool check;
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/**
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* include address list update
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*/
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bool address;
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};
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/**
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* flush the IKE_SAs list of additional addresses
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*/
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static void flush_additional_addresses(private_ike_mobike_t *this)
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{
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iterator_t *iterator;
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host_t *host;
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iterator = this->ike_sa->create_additional_address_iterator(this->ike_sa);
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while (iterator->iterate(iterator, (void**)&host))
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{
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iterator->remove(iterator);
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host->destroy(host);
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}
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iterator->destroy(iterator);
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}
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/**
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* read notifys from message and evaluate them
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*/
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static void process_payloads(private_ike_mobike_t *this, message_t *message)
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{
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enumerator_t *enumerator;
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payload_t *payload;
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bool first = TRUE;
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enumerator = message->create_payload_enumerator(message);
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while (enumerator->enumerate(enumerator, &payload))
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{
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int family = AF_INET;
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notify_payload_t *notify;
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chunk_t data;
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host_t *host;
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if (payload->get_type(payload) != NOTIFY)
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{
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continue;
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}
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notify = (notify_payload_t*)payload;
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switch (notify->get_notify_type(notify))
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{
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case MOBIKE_SUPPORTED:
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{
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peer_cfg_t *peer_cfg;
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peer_cfg = this->ike_sa->get_peer_cfg(this->ike_sa);
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if (!this->initiator &&
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peer_cfg && !peer_cfg->use_mobike(peer_cfg))
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{
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DBG1(DBG_IKE, "peer supports MOBIKE, but disabled in config");
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}
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else
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{
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DBG1(DBG_IKE, "peer supports MOBIKE");
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this->ike_sa->enable_extension(this->ike_sa, EXT_MOBIKE);
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}
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break;
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}
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case COOKIE2:
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{
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chunk_free(&this->cookie2);
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this->cookie2 = chunk_clone(notify->get_notification_data(notify));
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break;
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}
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case ADDITIONAL_IP6_ADDRESS:
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{
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family = AF_INET6;
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/* fall through */
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}
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case ADDITIONAL_IP4_ADDRESS:
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{
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if (first)
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{ /* an ADDITIONAL_*_ADDRESS means replace, so flush once */
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flush_additional_addresses(this);
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first = FALSE;
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}
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data = notify->get_notification_data(notify);
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host = host_create_from_chunk(family, data, 0);
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DBG2(DBG_IKE, "got additional MOBIKE peer address: %H", host);
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this->ike_sa->add_additional_address(this->ike_sa, host);
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break;
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}
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case UPDATE_SA_ADDRESSES:
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{
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this->update = TRUE;
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break;
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}
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case NO_ADDITIONAL_ADDRESSES:
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{
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flush_additional_addresses(this);
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break;
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}
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case NAT_DETECTION_SOURCE_IP:
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case NAT_DETECTION_DESTINATION_IP:
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{
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/* NAT check in this MOBIKE exchange, create subtask for it */
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if (this->natd == NULL)
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{
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this->natd = ike_natd_create(this->ike_sa, this->initiator);
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}
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break;
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}
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default:
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break;
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}
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}
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enumerator->destroy(enumerator);
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}
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/**
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* Add ADDITIONAL_*_ADDRESS notifys depending on our address list
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*/
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static void build_address_list(private_ike_mobike_t *this, message_t *message)
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{
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enumerator_t *enumerator;
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host_t *host, *me;
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notify_type_t type;
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int added = 0;
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me = this->ike_sa->get_my_host(this->ike_sa);
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enumerator = charon->kernel_interface->create_address_enumerator(
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charon->kernel_interface, FALSE, FALSE);
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while (enumerator->enumerate(enumerator, (void**)&host))
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{
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if (me->ip_equals(me, host))
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{ /* "ADDITIONAL" means do not include IKE_SAs host */
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continue;
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}
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switch (host->get_family(host))
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{
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case AF_INET:
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type = ADDITIONAL_IP4_ADDRESS;
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break;
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case AF_INET6:
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type = ADDITIONAL_IP6_ADDRESS;
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break;
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default:
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continue;
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}
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message->add_notify(message, FALSE, type, host->get_address(host));
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if (++added >= MAX_ADDITIONAL_ADDRS)
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{ /* limit number of notifys, some implementations do not like too
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* many of them (f.e. strongSwan ;-) */
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break;
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}
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}
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if (!added)
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{
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message->add_notify(message, FALSE, NO_ADDITIONAL_ADDRESSES, chunk_empty);
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}
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enumerator->destroy(enumerator);
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}
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/**
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* build a cookie and add it to the message
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*/
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static void build_cookie(private_ike_mobike_t *this, message_t *message)
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{
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rng_t *rng;
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chunk_free(&this->cookie2);
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rng = lib->crypto->create_rng(lib->crypto, RNG_STRONG);
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if (rng)
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{
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rng->allocate_bytes(rng, COOKIE2_SIZE, &this->cookie2);
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rng->destroy(rng);
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message->add_notify(message, FALSE, COOKIE2, this->cookie2);
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}
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}
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/**
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* update addresses of associated CHILD_SAs
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*/
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static void update_children(private_ike_mobike_t *this)
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{
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iterator_t *iterator;
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child_sa_t *child_sa;
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iterator = this->ike_sa->create_child_sa_iterator(this->ike_sa);
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while (iterator->iterate(iterator, (void**)&child_sa))
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{
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if (child_sa->update(child_sa,
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this->ike_sa->get_my_host(this->ike_sa),
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this->ike_sa->get_other_host(this->ike_sa),
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this->ike_sa->get_virtual_ip(this->ike_sa, TRUE),
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this->ike_sa->has_condition(this->ike_sa, COND_NAT_ANY)) == NOT_SUPPORTED)
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{
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this->ike_sa->rekey_child_sa(this->ike_sa,
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child_sa->get_protocol(child_sa),
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child_sa->get_spi(child_sa, TRUE));
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}
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}
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iterator->destroy(iterator);
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}
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/**
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* Apply port of old address if it equals new, port otherwise
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*/
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static void apply_port(private_ike_mobike_t *this, host_t *host, host_t *old,
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u_int16_t port)
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{
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if (host->ip_equals(host, old))
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{
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host->set_port(host, old->get_port(old));
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}
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else
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{
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if (port == IKEV2_UDP_PORT)
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{
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host->set_port(host, IKEV2_NATT_PORT);
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}
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else
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{
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host->set_port(host, port);
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}
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}
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}
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/**
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* Implementation of ike_mobike_t.transmit
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*/
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static void transmit(private_ike_mobike_t *this, packet_t *packet)
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{
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host_t *me, *other, *me_old, *other_old;
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iterator_t *iterator;
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ike_cfg_t *ike_cfg;
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packet_t *copy;
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if (!this->check)
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{
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return;
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}
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me_old = this->ike_sa->get_my_host(this->ike_sa);
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other_old = this->ike_sa->get_other_host(this->ike_sa);
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ike_cfg = this->ike_sa->get_ike_cfg(this->ike_sa);
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me = charon->kernel_interface->get_source_addr(
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charon->kernel_interface, other_old, NULL);
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if (me)
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{
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apply_port(this, me, me_old, ike_cfg->get_my_port(ike_cfg));
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DBG1(DBG_IKE, "checking original path %#H - %#H", me, other_old);
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copy = packet->clone(packet);
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copy->set_source(copy, me);
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charon->sender->send(charon->sender, copy);
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}
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iterator = this->ike_sa->create_additional_address_iterator(this->ike_sa);
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while (iterator->iterate(iterator, (void**)&other))
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{
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me = charon->kernel_interface->get_source_addr(
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charon->kernel_interface, other, NULL);
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if (me)
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{
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if (me->get_family(me) != other->get_family(other))
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{
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me->destroy(me);
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continue;
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}
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/* reuse port for an active address, 4500 otherwise */
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apply_port(this, me, me_old, ike_cfg->get_my_port(ike_cfg));
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other = other->clone(other);
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apply_port(this, other, other_old, ike_cfg->get_other_port(ike_cfg));
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DBG1(DBG_IKE, "checking path %#H - %#H", me, other);
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copy = packet->clone(packet);
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copy->set_source(copy, me);
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copy->set_destination(copy, other);
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charon->sender->send(charon->sender, copy);
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}
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}
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iterator->destroy(iterator);
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}
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/**
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* Implementation of task_t.process for initiator
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*/
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static status_t build_i(private_ike_mobike_t *this, message_t *message)
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{
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if (message->get_message_id(message) == 1)
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{ /* only in first IKE_AUTH */
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message->add_notify(message, FALSE, MOBIKE_SUPPORTED, chunk_empty);
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build_address_list(this, message);
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}
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else if (message->get_exchange_type(message) == INFORMATIONAL)
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{
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host_t *old, *new;
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/* we check if the existing address is still valid */
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old = message->get_source(message);
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new = charon->kernel_interface->get_source_addr(charon->kernel_interface,
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message->get_destination(message), old);
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if (new)
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{
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if (!new->ip_equals(new, old))
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{
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new->set_port(new, old->get_port(old));
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message->set_source(message, new);
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}
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else
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{
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new->destroy(new);
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}
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}
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if (this->update)
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{
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message->add_notify(message, FALSE, UPDATE_SA_ADDRESSES, chunk_empty);
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build_cookie(this, message);
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update_children(this);
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}
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if (this->address)
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{
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build_address_list(this, message);
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}
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if (this->natd)
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{
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this->natd->task.build(&this->natd->task, message);
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}
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}
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.process for responder
|
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*/
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static status_t process_r(private_ike_mobike_t *this, message_t *message)
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{
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if (message->get_message_id(message) == 1)
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{ /* only first IKE_AUTH */
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process_payloads(this, message);
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}
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else if (message->get_exchange_type(message) == INFORMATIONAL)
|
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{
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process_payloads(this, message);
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if (this->update)
|
||||
{
|
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host_t *me, *other;
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me = message->get_destination(message);
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other = message->get_source(message);
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this->ike_sa->set_my_host(this->ike_sa, me->clone(me));
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this->ike_sa->set_other_host(this->ike_sa, other->clone(other));
|
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}
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|
||||
if (this->natd)
|
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{
|
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this->natd->task.process(&this->natd->task, message);
|
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}
|
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}
|
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return NEED_MORE;
|
||||
}
|
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|
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/**
|
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* Implementation of task_t.build for responder
|
||||
*/
|
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static status_t build_r(private_ike_mobike_t *this, message_t *message)
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{
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if (message->get_exchange_type(message) == IKE_AUTH &&
|
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this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
|
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{
|
||||
if (this->ike_sa->supports_extension(this->ike_sa, EXT_MOBIKE))
|
||||
{
|
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message->add_notify(message, FALSE, MOBIKE_SUPPORTED, chunk_empty);
|
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build_address_list(this, message);
|
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}
|
||||
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)
|
||||
{
|
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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;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user