/*
* Copyright (c) 2009 Lukas Mejdrech
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup ip
* @{
*/
/** @file
* IP client interface implementation.
* @see ip_client.h
*/
#include <errno.h>
#include <sys/types.h>
#include "../../include/ip_client.h"
#include "../../structures/packet/packet.h"
#include "../../structures/packet/packet_client.h"
#include "ip_header.h"
int ip_client_prepare_packet( packet_t packet, ip_protocol_t protocol, ip_ttl_t ttl, ip_tos_t tos, int dont_fragment, size_t ipopt_length ){
ip_header_ref header;
uint8_t * data;
size_t padding;
padding = ipopt_length % 4;
if( padding ){
padding = 4 - padding;
ipopt_length += padding;
}
data = ( uint8_t * ) packet_prefix( packet, sizeof( ip_header_t ) + padding );
if( ! data ) return ENOMEM;
while( padding -- ) data[ sizeof( ip_header_t ) + padding ] = IPOPT_NOOP;
header = ( ip_header_ref ) data;
header->ihl = ( uint8_t ) ( sizeof( ip_header_t ) + ipopt_length ) / 4;
header->ttl = ttl ? (( ttl <= MAXTTL ) ? ttl : MAXTTL ) : IPDEFTTL;
header->tos = tos;
header->protocol = protocol;
if( dont_fragment ) header->flags = IPFLAG_DONT_FRAGMENT;
return EOK;
}
int ip_client_process_packet( packet_t packet, ip_protocol_t * protocol, ip_ttl_t * ttl, ip_tos_t * tos, int * dont_fragment, size_t * ipopt_length ){
ip_header_ref header;
header = ( ip_header_ref ) packet_get_data( packet );
if( ! header ) return ENOMEM;
if( protocol ) * protocol = header->protocol;
if( ttl ) * ttl = header->ttl;
if( tos ) * tos = header->tos;
if( dont_fragment ) * dont_fragment = header->flags & IPFLAG_DONT_FRAGMENT;
if( ipopt_length ){
* ipopt_length = header->ihl * 4 - sizeof( ip_header_t );
return packet_trim( packet, sizeof( ip_header_t ), 0 );
}else{
return packet_trim( packet, header->ihl * 4, 0 );
}
}
/** @}
*/