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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 eth
  30.  *  @{
  31.  */
  32.  
  33. /** @file
  34.  *  Ethernet protocol header definitions.
  35.  *  Names according to the linux src/include/linux/ip.h header file.
  36.  */
  37.  
  38. #ifndef __NET_ETH_HEADER_H__
  39. #define __NET_ETH_HEADER_H__
  40.  
  41. #include <sys/types.h>
  42.  
  43. #define ETH_ADDR        6
  44.  
  45. #define ETH_PREAMBLE    0x55
  46.  
  47. #define ETH_SFD         0xF5
  48.  
  49. #define ETH_LSAP_SNAP   0xAA
  50.  
  51. #define ETH_RAW         0xFF
  52.  
  53. /** Type definition of the Ethernet header with all the extensions.
  54.  *  @see eth_header_ex
  55.  */
  56. typedef struct eth_header_ex    eth_header_ex_t;
  57.  
  58. /** Type definition of the Ethernet header with all the extensions pointer.
  59.  *  @see eth_header
  60.  */
  61. typedef eth_header_ex_t *       eth_header_ex_ref;
  62.  
  63. /** Type definition of the Ethernet header LSAP extension.
  64.  *  @see eth_header_lsap
  65.  */
  66. typedef struct eth_header_lsap  eth_header_lsap_t;
  67.  
  68. /** Type definition of the Ethernet header LSAP extension pointer.
  69.  *  @see eth_header_lsap
  70.  */
  71. typedef eth_header_lsap_t *     eth_header_lsap_ref;
  72.  
  73. /** Type definition of the Ethernet header SNAP extension.
  74.  *  @see eth_header_snap
  75.  */
  76. typedef struct eth_header_snap  eth_header_snap_t;
  77.  
  78. /** Type definition of the Ethernet header SNAP extension pointer.
  79.  *  @see eth_header_snap
  80.  */
  81. typedef eth_header_snap_t *     eth_header_snap_ref;
  82.  
  83. /** Type definition of the Ethernet header.
  84.  *  @see eth_header
  85.  */
  86. typedef struct eth_header   eth_header_t;
  87.  
  88. /** Type definition of the Ethernet header pointer.
  89.  *  @see eth_header
  90.  */
  91. typedef eth_header_t *      eth_header_ref;
  92.  
  93. /** Ethernet header Link Service Access Point extension.
  94.  */
  95. struct eth_header_lsap{
  96.     /** Destination Service Access Point identifier.
  97.      *  The possible values are assigned by an IEEE committee.
  98.      */
  99.     uint8_t     dsap;
  100.     /** Source Service Access Point identifier.
  101.      *  The possible values are assigned by an IEEE committee.
  102.      */
  103.     uint8_t     ssap;
  104.     /** Control parameter.
  105.      *  The possible values are assigned by an IEEE committee.
  106.      */
  107.     uint8_t     ctrl;
  108. };
  109.  
  110. /** Ethernet header SNAP extension.
  111.  */
  112. struct eth_header_snap{
  113.     /** Protocol identifier or organization code.
  114.      */
  115.     uint8_t     proto[ 3 ];
  116.     /** Ethernet protocol identifier in the network byte order (big endian).
  117.      *  @see ethernet_protocols.h
  118.      */
  119.     uint16_t    ethertype;
  120. };
  121.  
  122. /** Ethernet header.
  123.  */
  124. struct eth_header{
  125.     /** Controlling preamble used for the frame transmission synchronization.
  126.      *  All should be set to ETH_PREAMBLE.
  127.      */
  128.     uint8_t     preamble[ 7 ];
  129.     /** Start of Frame Delimiter used for the frame transmission synchronization.
  130.      *  Should be set to ETH_SFD.
  131.      */
  132.     uint8_t     sfd;
  133.     /** Destination host Ethernet address (MAC address).
  134.      */
  135.     uint8_t     dest[ ETH_ADDR ];
  136.     /** Source host Ethernet address (MAC address).
  137.      */
  138.     uint8_t     src[ ETH_ADDR ];
  139.     /** Ethernet protocol identifier in the network byte order (big endian).
  140.      *  @see ethernet_protocols.h
  141.      */
  142.     uint16_t    ethertype;
  143. };
  144.  
  145. /** Ethernet header with all the extensions.
  146.  */
  147. struct eth_header_ex{
  148.     /** Ethernet header.
  149.      */
  150.     eth_header_t        header;
  151.     /** LSAP extension.
  152.      *  If DSAP and SSAP are set to ETH_LSAP_SNAP the SNAP extension is being used.
  153.      *  If DSAP and SSAP fields are equal to ETH_RAW the raw Ethernet packet without any extensions is being used and the frame content starts rigth after the two fields.
  154.      */
  155.     eth_header_lsap_t   lsap;
  156.     /** SNAP extension.
  157.      */
  158.     eth_header_snap_t   snap;
  159. };
  160.  
  161. #endif
  162.  
  163. /** @}
  164.  */
  165.