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/*
* Copyright (C) 2012 Tobias Brunner
* 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 "ip_packet.h"
#include <library.h>
#include <utils/debug.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#ifdef HAVE_NETINET_IP6_H
#include <netinet/ip6.h>
#endif
typedef struct private_ip_packet_t private_ip_packet_t;
/**
* Private additions to ip_packet_t.
*/
struct private_ip_packet_t {
/**
* Public members
*/
ip_packet_t public;
/**
* Source address
*/
host_t *src;
/**
* Destination address
*/
host_t *dst;
/**
* IP packet
*/
chunk_t packet;
/**
* IP version
*/
u_int8_t version;
/**
* Protocol|Next Header field
*/
u_int8_t next_header;
};
METHOD(ip_packet_t, get_version, u_int8_t,
private_ip_packet_t *this)
{
return this->version;
}
METHOD(ip_packet_t, get_source, host_t*,
private_ip_packet_t *this)
{
return this->src;
}
METHOD(ip_packet_t, get_destination, host_t*,
private_ip_packet_t *this)
{
return this->dst;
}
METHOD(ip_packet_t, get_encoding, chunk_t,
private_ip_packet_t *this)
{
return this->packet;
}
METHOD(ip_packet_t, get_next_header, u_int8_t,
private_ip_packet_t *this)
{
return this->next_header;
}
METHOD(ip_packet_t, clone, ip_packet_t*,
private_ip_packet_t *this)
{
return ip_packet_create(this->packet);
}
METHOD(ip_packet_t, destroy, void,
private_ip_packet_t *this)
{
this->src->destroy(this->src);
this->dst->destroy(this->dst);
chunk_free(&this->packet);
free(this);
}
/**
* Described in header.
*/
ip_packet_t *ip_packet_create(chunk_t packet)
{
private_ip_packet_t *this;
u_int8_t version, next_header;
host_t *src, *dst;
if (packet.len < 1)
{
DBG1(DBG_ESP, "IP packet too short");
goto failed;
}
version = (packet.ptr[0] & 0xf0) >> 4;
switch (version)
{
case 4:
{
struct ip *ip;
if (packet.len < sizeof(struct ip))
{
DBG1(DBG_ESP, "IPv4 packet too short");
goto failed;
}
ip = (struct ip*)packet.ptr;
src = host_create_from_chunk(AF_INET,
chunk_from_thing(ip->ip_src), 0);
dst = host_create_from_chunk(AF_INET,
chunk_from_thing(ip->ip_dst), 0);
next_header = ip->ip_p;
break;
}
#ifdef HAVE_NETINET_IP6_H
case 6:
{
struct ip6_hdr *ip;
if (packet.len < sizeof(struct ip6_hdr))
{
DBG1(DBG_ESP, "IPv6 packet too short");
goto failed;
}
ip = (struct ip6_hdr*)packet.ptr;
src = host_create_from_chunk(AF_INET6,
chunk_from_thing(ip->ip6_src), 0);
dst = host_create_from_chunk(AF_INET6,
chunk_from_thing(ip->ip6_dst), 0);
next_header = ip->ip6_nxt;
break;
}
#endif /* HAVE_NETINET_IP6_H */
default:
DBG1(DBG_ESP, "unsupported IP version");
goto failed;
}
INIT(this,
.public = {
.get_version = _get_version,
.get_source = _get_source,
.get_destination = _get_destination,
.get_next_header = _get_next_header,
.get_encoding = _get_encoding,
.clone = _clone,
.destroy = _destroy,
},
.src = src,
.dst = dst,
.packet = packet,
.version = version,
.next_header = next_header,
);
return &this->public;
failed:
chunk_free(&packet);
return NULL;
}
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