redesigned IKE_SA using a transaction mechanism:
removed old state machine reimplemented IKE_SA setup and delete implemented dead peer detection implemented keep-alives a lot of fixes no rekeying yet
This commit is contained in:
Martin Willi
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/**
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* @file delete_ike_sa.c
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*
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* @brief Implementation of the delete_ike_sa transaction.
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*
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*/
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/*
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* Copyright (C) 2006 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 "delete_ike_sa.h"
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#include <daemon.h>
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#include <encoding/payloads/delete_payload.h>
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typedef struct private_delete_ike_sa_t private_delete_ike_sa_t;
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/**
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* Private members of a delete_ike_sa_t object..
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*/
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struct private_delete_ike_sa_t {
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/**
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* Public methods and transaction_t interface.
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*/
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delete_ike_sa_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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* Message sent by our peer, if already generated
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*/
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message_t *message;
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/**
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* Message ID this transaction uses
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*/
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u_int32_t message_id;
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/**
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* Times we did send the request
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*/
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u_int32_t requested;
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/**
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* Assigned logger.
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*/
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logger_t *logger;
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};
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/**
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* Implementation of transaction_t.get_message_id.
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*/
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static u_int32_t get_message_id(private_delete_ike_sa_t *this)
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{
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return this->message_id;
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}
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/**
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* Implementation of transaction_t.requested.
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*/
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static u_int32_t requested(private_delete_ike_sa_t *this)
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{
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return this->requested++;
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}
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/**
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* Implementation of transaction_t.get_request.
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*/
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static status_t get_request(private_delete_ike_sa_t *this, message_t **result)
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{
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message_t *request;
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connection_t *connection;
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host_t *me, *other;
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delete_payload_t *delete_payload;
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/* check if we already have built a message (retransmission) */
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if (this->message)
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{
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*result = this->message;
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return SUCCESS;
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}
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connection = this->ike_sa->get_connection(this->ike_sa);
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me = connection->get_my_host(connection);
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other = connection->get_other_host(connection);
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/* build the request */
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request = message_create();
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request->set_source(request, me->clone(me));
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request->set_destination(request, other->clone(other));
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request->set_exchange_type(request, INFORMATIONAL);
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request->set_request(request, TRUE);
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request->set_message_id(request, this->message_id);
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request->set_ike_sa_id(request, this->ike_sa->get_id(this->ike_sa));
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/* apply for caller */
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*result = request;
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/* store for retransmission */
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this->message = request;
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delete_payload = delete_payload_create(PROTO_IKE);
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request->add_payload(request, (payload_t*)delete_payload);
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/* transit to state SA_DELETING */
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this->ike_sa->set_state(this->ike_sa, SA_DELETING);
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return SUCCESS;
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}
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/**
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* Implementation of transaction_t.get_response.
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*/
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static status_t get_response(private_delete_ike_sa_t *this, message_t *request,
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message_t **result, transaction_t **next)
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{
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host_t *me, *other;
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message_t *response;
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iterator_t *payloads;
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delete_payload_t *delete_request = NULL;
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connection_t *connection;
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/* check message type */
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if (request->get_exchange_type(request) != INFORMATIONAL)
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{
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this->logger->log(this->logger, ERROR,
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"INFORMATIONAL response of invalid type, deleting IKE_SA");
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return DESTROY_ME;
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}
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/* check if we already have built a response (retransmission)
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* this only happens in special simultanous transaction cases,
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* as we delete the IKE_SA after the response is sent. */
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if (this->message)
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{
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*result = this->message;
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return SUCCESS;
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}
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connection = this->ike_sa->get_connection(this->ike_sa);
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me = connection->get_my_host(connection);
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other = connection->get_other_host(connection);
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/* set up response */
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response = message_create();
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response->set_source(response, me->clone(me));
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response->set_destination(response, other->clone(other));
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response->set_exchange_type(response, INFORMATIONAL);
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response->set_request(response, FALSE);
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response->set_message_id(response, this->message_id);
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response->set_ike_sa_id(response, this->ike_sa->get_id(this->ike_sa));
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this->message = response;
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*result = response;
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/* iterate over all payloads */
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payloads = request->get_payload_iterator(request);
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while (payloads->has_next(payloads))
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{
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payload_t *payload;
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payloads->current(payloads, (void**)&payload);
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switch (payload->get_type(payload))
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{
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case DELETE:
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{
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delete_request = (delete_payload_t *)payload;
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break;
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}
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default:
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{
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this->logger->log(this->logger, ERROR|LEVEL1, "ignoring payload %s (%d)",
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mapping_find(payload_type_m, payload->get_type(payload)),
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payload->get_type(payload));
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break;
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}
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}
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}
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payloads->destroy(payloads);
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if (delete_request &&
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delete_request->get_protocol_id(delete_request) == PROTO_IKE)
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{
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this->logger->log(this->logger, CONTROL,
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"DELETE request for IKE_SA received, deleting IKE_SA");
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}
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else
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{
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/* should not happen, as we preparsed this at transaction construction */
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this->logger->log(this->logger, CONTROL,
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"received a weird DELETE request for IKE_SA, deleting anyway");
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}
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if (this->ike_sa->get_state(this->ike_sa) == SA_DELETING)
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{
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/* if we are already deleting an IKE_SA, we do not destroy. We wait
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* until we get the response for our initiated delete. */
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return SUCCESS;
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}
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this->ike_sa->set_state(this->ike_sa, SA_DELETING);
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return DESTROY_ME;
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}
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/**
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* Implementation of transaction_t.conclude
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*/
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static status_t conclude(private_delete_ike_sa_t *this, message_t *response,
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transaction_t **transaction)
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{
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/* check message type */
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if (response->get_exchange_type(response) != INFORMATIONAL)
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{
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this->logger->log(this->logger, ERROR,
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"INFORMATIONAL response of invalid type, deleting IKE_SA");
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return DESTROY_ME;
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}
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/* this is only an acknowledge. We can't do anything here, but delete
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* the IKE_SA. */
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return DESTROY_ME;
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}
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/**
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* implements transaction_t.destroy
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*/
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static void destroy(private_delete_ike_sa_t *this)
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{
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if (this->message)
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{
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this->message->destroy(this->message);
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}
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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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delete_ike_sa_t *delete_ike_sa_create(ike_sa_t *ike_sa, u_int32_t message_id)
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{
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private_delete_ike_sa_t *this = malloc_thing(private_delete_ike_sa_t);
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/* transaction interface functions */
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this->public.transaction.get_request = (status_t(*)(transaction_t*,message_t**))get_request;
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this->public.transaction.get_response = (status_t(*)(transaction_t*,message_t*,message_t**,transaction_t**))get_response;
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this->public.transaction.conclude = (status_t(*)(transaction_t*,message_t*,transaction_t**))conclude;
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this->public.transaction.get_message_id = (u_int32_t(*)(transaction_t*))get_message_id;
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this->public.transaction.requested = (u_int32_t(*)(transaction_t*))requested;
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this->public.transaction.destroy = (void(*)(transaction_t*))destroy;
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/* private data */
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this->ike_sa = ike_sa;
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this->message_id = message_id;
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this->message = NULL;
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this->requested = 0;
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this->logger = logger_manager->get_logger(logger_manager, IKE_SA);
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return &this->public;
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}
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