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  1. /*
  2.  * Copyright (c) 2009 Lukas Mejdrech
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup ip
  30.  *  @{
  31.  */
  32.  
  33. /**
  34.  * @file
  35.  */
  36.  
  37. #include <errno.h>
  38.  
  39. #include <sys/types.h>
  40.  
  41. #include "../../include/ip_client.h"
  42.  
  43. #include "../../structures/packet/packet.h"
  44. #include "../../structures/packet/packet_client.h"
  45.  
  46. #include "ip_header.h"
  47.  
  48. 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 ){
  49.     ip_header_ref   header;
  50.     uint8_t *       data;
  51.     size_t          padding;
  52.  
  53.     padding =  ipopt_length % 4;
  54.     if( padding ){
  55.         padding = 4 - padding;
  56.         ipopt_length += padding;
  57.     }
  58.     data = ( uint8_t * ) packet_prefix( packet, sizeof( ip_header_t ) + padding );
  59.     if( ! data ) return ENOMEM;
  60.     while( padding -- ) data[ sizeof( ip_header_t ) + padding ] = IPOPT_NOOP;
  61.     header = ( ip_header_ref ) data;
  62.     header->ihl = ( uint8_t ) ( sizeof( ip_header_t ) + ipopt_length ) / 4;
  63.     header->ttl = ttl ? (( ttl <= MAXTTL ) ? ttl : MAXTTL ) : IPDEFTTL;
  64.     header->tos = tos;
  65.     header->protocol = protocol;
  66.     if( dont_fragment ) header->flags = IPFLAG_DONT_FRAGMENT;
  67.     return EOK;
  68. }
  69.  
  70. 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 ){
  71.     ip_header_ref   header;
  72.  
  73.     header = ( ip_header_ref ) packet_get_data( packet );
  74.     if( ! header ) return ENOMEM;
  75.     if( protocol ) * protocol = header->protocol;
  76.     if( ttl ) * ttl = header->ttl;
  77.     if( tos ) * tos = header->tos;
  78.     if( dont_fragment ) * dont_fragment = header->flags & IPFLAG_DONT_FRAGMENT;
  79.     if( ipopt_length ){
  80.         * ipopt_length = header->ihl * 4 - sizeof( ip_header_t );
  81.         return packet_trim( packet, sizeof( ip_header_t ), 0 );
  82.     }else{
  83.         return packet_trim( packet, header->ihl * 4, 0 );
  84.     }
  85. }
  86.  
  87. /** @}
  88.  */
  89.