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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 icmp
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  ICMP header definition.
  35.  *  Based on the RFC~792.
  36.  */
  37.  
  38. #ifndef __NET_ICMP_HEADER_H__
  39. #define __NET_ICMP_HEADER_H__
  40.  
  41. #include <sys/types.h>
  42.  
  43. #include "../../include/in.h"
  44. #include "../../include/icmp_codes.h"
  45.  
  46. /** Type definition of the echo specific data.
  47.  *  @see icmp_echo
  48.  */
  49. typedef struct icmp_echo    icmp_echo_t;
  50.  
  51. /** Type definition of the echo specific data pointer.
  52.  *  @see icmp_echo
  53.  */
  54. typedef icmp_echo_t *       icmp_echo_ref;
  55.  
  56. /** Echo specific data.
  57.  */
  58. struct icmp_echo{
  59.     /** Message idintifier.
  60.      */
  61.     icmp_param_t    identifier;
  62.     /** Message sequence number.
  63.      */
  64.     icmp_param_t    sequence_number;
  65. } __attribute__ ((packed));
  66.  
  67. /** Type definition of the internet control message header.
  68.  *  @see icmp_header
  69.  */
  70. typedef struct icmp_header  icmp_header_t;
  71.  
  72. /** Type definition of the internet control message header pointer.
  73.  *  @see icmp_header
  74.  */
  75. typedef icmp_header_t *     icmp_header_ref;
  76.  
  77. /** Internet control message header.
  78.  */
  79. struct icmp_header{
  80.     /** The type of the message.
  81.      */
  82.     uint8_t type;
  83.     /** The error code for the datagram reported by the ICMP message.
  84.      *  The interpretation is dependent on the message type.
  85.      */
  86.     uint8_t code;
  87.     /** The checksum is the 16-bit ones's complement of the one's complement sum of the ICMP message starting with the ICMP Type.
  88.      *  For computing the checksum, the checksum field should be zero.
  89.      *  If the checksum does not match the contents, the datagram is discarded.
  90.      */
  91.     uint16_t    checksum;
  92.     /** Message specific data.
  93.      */
  94.     union{
  95.         /** Echo specific data.
  96.          */
  97.         icmp_echo_t         echo;
  98.         /** Proposed gateway value.
  99.          */
  100.         in_addr_t           gateway;
  101.         /** Fragmentation needed specific data.
  102.          */
  103.         struct{
  104.             /** Reserved field.
  105.              *  Must be zero.
  106.              */
  107.             icmp_param_t    reserved;
  108.             /** Proposed MTU.
  109.              */
  110.             icmp_param_t    mtu;
  111.         } frag;
  112.         /** Parameter problem specific data.
  113.          */
  114.         struct{
  115.             /** Problem pointer.
  116.              */
  117.             icmp_param_t    pointer;
  118.             /** Reserved field.
  119.              *  Must be zero.
  120.              */
  121.             icmp_param_t    reserved;
  122.         } param;
  123.     } un;
  124. } __attribute__ ((packed));
  125.  
  126. #endif
  127.  
  128. /** @}
  129.  */
  130.