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/**
* @file configuration.c
*
* @brief Implementation of configuration_t.
*
*/
/*
* Copyright (C) 2006 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.
*/
#include <stdlib.h>
#include <math.h>
#include "configuration.h"
#include <types.h>
/**
* Timeout in milliseconds after that a half open IKE_SA gets deleted.
*/
#define HALF_OPEN_IKE_SA_TIMEOUT 30000
/**
* First retransmit timeout in milliseconds.
* Timeout value is increasing in each retransmit round.
*/
#define RETRANSMIT_TIMEOUT 6000
/**
* Base which is raised to the power of the retransmission count.
*/
#define RETRANSMIT_BASE 1.5
/**
* Max retransmit count.
* 0 for infinite. The max time a half open IKE_SA is alive is set by
* RETRANSMIT_TIMEOUT.
*/
#define MAX_RETRANSMIT_COUNT 6
/**
* Keepalive interval in milliseconds.
*/
#define KEEPALIVE_INTERVAL 2000000
/**
* DPD interval in milliseconds.
*/
#define DPD_INTERVAL 6000000
typedef struct private_configuration_t private_configuration_t;
/**
* Private data of an configuration_t object.
*/
struct private_configuration_t {
/**
* Public part of configuration_t object.
*/
configuration_t public;
};
/**
* Implementation of configuration_t.get_retransmit_timeout.
*/
static status_t get_retransmit_timeout (private_configuration_t *this, u_int32_t retransmit_count, u_int32_t *timeout)
{
if (retransmit_count > MAX_RETRANSMIT_COUNT && MAX_RETRANSMIT_COUNT != 0)
{
return FAILED;
}
*timeout = (u_int32_t)(RETRANSMIT_TIMEOUT * pow(RETRANSMIT_BASE, retransmit_count));
return SUCCESS;
}
/**
* Implementation of configuration_t.get_half_open_ike_sa_timeout.
*/
static u_int32_t get_half_open_ike_sa_timeout (private_configuration_t *this)
{
return HALF_OPEN_IKE_SA_TIMEOUT;
}
/**
* Implementation of configuration_t.get_keepalive_interval.
*/
static u_int32_t get_keepalive_interval (private_configuration_t *this)
{
return KEEPALIVE_INTERVAL;
}
/**
* Implementation of configuration_t.get_dpd_interval.
*/
static u_int32_t get_dpd_interval (private_configuration_t *this)
{
return DPD_INTERVAL;
}
/**
* Implementation of configuration_t.destroy.
*/
static void destroy(private_configuration_t *this)
{
free(this);
}
/*
* Described in header-file
*/
configuration_t *configuration_create()
{
private_configuration_t *this = malloc_thing(private_configuration_t);
/* public functions */
this->public.destroy = (void(*)(configuration_t*))destroy;
this->public.get_retransmit_timeout = (status_t (*) (configuration_t *, u_int32_t retransmit_count, u_int32_t *timeout))get_retransmit_timeout;
this->public.get_half_open_ike_sa_timeout = (u_int32_t (*) (configuration_t *)) get_half_open_ike_sa_timeout;
this->public.get_keepalive_interval = (u_int32_t (*) (configuration_t *)) get_keepalive_interval;
this->public.get_dpd_interval = (u_int32_t (*) (configuration_t *)) get_dpd_interval;
return (&this->public);
}
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