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/*
* Copyright (C) 2012 Tobias Brunner
* Copyright (C) 2012 Giuliano Grassi
* Copyright (C) 2012 Ralf Sager
* 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 "ipsec_policy.h"
#include <utils/debug.h>
typedef struct private_ipsec_policy_t private_ipsec_policy_t;
/**
* Private additions to ipsec_policy_t.
*/
struct private_ipsec_policy_t {
/**
* Public members
*/
ipsec_policy_t public;
/**
* SA source address
*/
host_t *src;
/**
* SA destination address
*/
host_t *dst;
/**
* Source traffic selector
*/
traffic_selector_t *src_ts;
/**
* Destination traffic selector
*/
traffic_selector_t *dst_ts;
/**
* If any of the two TS has a protocol selector we cache it here
*/
uint8_t protocol;
/**
* Traffic direction
*/
policy_dir_t direction;
/**
* Policy type
*/
policy_type_t type;
/**
* SA configuration
*/
ipsec_sa_cfg_t sa;
/**
* Mark
*/
mark_t mark;
/**
* Policy priority
*/
policy_priority_t priority;
/**
* Reference counter
*/
refcount_t refcount;
};
METHOD(ipsec_policy_t, match, bool,
private_ipsec_policy_t *this, traffic_selector_t *src_ts,
traffic_selector_t *dst_ts, policy_dir_t direction, uint32_t reqid,
mark_t mark, policy_priority_t priority)
{
return (this->direction == direction &&
this->priority == priority &&
this->sa.reqid == reqid &&
memeq(&this->mark, &mark, sizeof(mark_t)) &&
this->src_ts->equals(this->src_ts, src_ts) &&
this->dst_ts->equals(this->dst_ts, dst_ts));
}
/**
* Match the port of the given host against the given traffic selector.
*/
static inline bool match_port(traffic_selector_t *ts, host_t *host)
{
uint16_t from, to, port;
from = ts->get_from_port(ts);
to = ts->get_to_port(ts);
if ((from == 0 && to == 0xffff) ||
(from == 0xffff && to == 0))
{
return TRUE;
}
port = host->get_port(host);
return from <= port && port <= to;
}
METHOD(ipsec_policy_t, match_packet, bool,
private_ipsec_policy_t *this, ip_packet_t *packet)
{
uint8_t proto = packet->get_next_header(packet);
host_t *src = packet->get_source(packet),
*dst = packet->get_destination(packet);
return (!this->protocol || this->protocol == proto) &&
this->src_ts->includes(this->src_ts, src) &&
match_port(this->src_ts, src) &&
this->dst_ts->includes(this->dst_ts, dst) &&
match_port(this->dst_ts, dst);
}
METHOD(ipsec_policy_t, get_source_ts, traffic_selector_t*,
private_ipsec_policy_t *this)
{
return this->src_ts;
}
METHOD(ipsec_policy_t, get_destination_ts, traffic_selector_t*,
private_ipsec_policy_t *this)
{
return this->dst_ts;
}
METHOD(ipsec_policy_t, get_reqid, uint32_t,
private_ipsec_policy_t *this)
{
return this->sa.reqid;
}
METHOD(ipsec_policy_t, get_direction, policy_dir_t,
private_ipsec_policy_t *this)
{
return this->direction;
}
METHOD(ipsec_policy_t, get_priority, policy_priority_t,
private_ipsec_policy_t *this)
{
return this->priority;
}
METHOD(ipsec_policy_t, get_type, policy_type_t,
private_ipsec_policy_t *this)
{
return this->type;
}
METHOD(ipsec_policy_t, get_ref, ipsec_policy_t*,
private_ipsec_policy_t *this)
{
ref_get(&this->refcount);
return &this->public;
}
METHOD(ipsec_policy_t, destroy, void,
private_ipsec_policy_t *this)
{
if (ref_put(&this->refcount))
{
this->src->destroy(this->src);
this->dst->destroy(this->dst);
this->src_ts->destroy(this->src_ts);
this->dst_ts->destroy(this->dst_ts);
free(this);
}
}
/**
* Described in header.
*/
ipsec_policy_t *ipsec_policy_create(host_t *src, host_t *dst,
traffic_selector_t *src_ts,
traffic_selector_t *dst_ts,
policy_dir_t direction, policy_type_t type,
ipsec_sa_cfg_t *sa, mark_t mark,
policy_priority_t priority)
{
private_ipsec_policy_t *this;
INIT(this,
.public = {
.match = _match,
.match_packet = _match_packet,
.get_source_ts = _get_source_ts,
.get_destination_ts = _get_destination_ts,
.get_direction = _get_direction,
.get_priority = _get_priority,
.get_reqid = _get_reqid,
.get_type = _get_type,
.get_ref = _get_ref,
.destroy = _destroy,
},
.src = src->clone(src),
.dst = dst->clone(dst),
.src_ts = src_ts->clone(src_ts),
.dst_ts = dst_ts->clone(dst_ts),
.protocol = max(src_ts->get_protocol(src_ts),
dst_ts->get_protocol(dst_ts)),
.direction = direction,
.type = type,
.sa = *sa,
.mark = mark,
.priority = priority,
.refcount = 1,
);
return &this->public;
}
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