308 lines
6.7 KiB
C
308 lines
6.7 KiB
C
/**
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* @file ike_mobike.c
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*
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* @brief Implementation of the ike_mobike task.
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*
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*/
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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 <encoding/payloads/notify_payload.h>
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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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* local host to roam to
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*/
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host_t *me;
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/**
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* remote host to roam to
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*/
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host_t *other;
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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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iterator_t *iterator;
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payload_t *payload;
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bool first = TRUE;
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iterator = message->get_payload_iterator(message);
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while (iterator->iterate(iterator, (void**)&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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DBG2(DBG_IKE, "peer supports MOBIKE");
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this->ike_sa->enable_extension(this->ike_sa, EXT_MOBIKE);
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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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}
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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 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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default:
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break;
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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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* 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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iterator_t *iterator;
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host_t *host, *me;
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notify_type_t type;
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bool additional = FALSE;
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me = this->ike_sa->get_my_host(this->ike_sa);
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iterator = charon->kernel_interface->create_address_iterator(
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charon->kernel_interface);
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while (iterator->iterate(iterator, (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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additional = TRUE;
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}
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if (!additional)
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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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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_exchange_type(message) == IKE_AUTH &&
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message->get_payload(message, SECURITY_ASSOCIATION))
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{
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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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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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process_payloads(this, message);
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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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*/
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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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message->get_payload(message, SECURITY_ASSOCIATION))
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{
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if (this->ike_sa->supports_extension(this->ike_sa, EXT_MOBIKE))
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{
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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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return SUCCESS;
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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 initiator
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*/
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static status_t process_i(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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message->get_payload(message, SECURITY_ASSOCIATION))
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{
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process_payloads(this, message);
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return SUCCESS;
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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 ike_mobike_t.roam.
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*/
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static void roam(private_ike_mobike_t *this, host_t *me, host_t *other)
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{
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this->me = me;
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this->other = other;
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}
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/**
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* Implementation of task_t.get_type
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*/
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static task_type_t get_type(private_ike_mobike_t *this)
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{
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return IKE_MOBIKE;
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}
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/**
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* Implementation of task_t.migrate
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*/
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static void migrate(private_ike_mobike_t *this, ike_sa_t *ike_sa)
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{
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DESTROY_IF(this->me);
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DESTROY_IF(this->other);
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this->ike_sa = ike_sa;
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this->me = NULL;
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this->other = NULL;
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}
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/**
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* Implementation of task_t.destroy
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*/
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static void destroy(private_ike_mobike_t *this)
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{
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DESTROY_IF(this->me);
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DESTROY_IF(this->other);
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free(this);
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}
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/*
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* Described in header.
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*/
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ike_mobike_t *ike_mobike_create(ike_sa_t *ike_sa, bool initiator)
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{
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private_ike_mobike_t *this = malloc_thing(private_ike_mobike_t);
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this->public.roam = (void(*)(ike_mobike_t*, host_t *, host_t *))roam;
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this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
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this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
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this->public.task.destroy = (void(*)(task_t*))destroy;
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if (initiator)
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{
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this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
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this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
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}
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else
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{
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this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
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this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
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}
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this->ike_sa = ike_sa;
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this->initiator = initiator;
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this->me = NULL;
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this->other = NULL;
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return &this->public;
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}
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