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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         0xD5
  48.  
  49. /** Type definition of the Ethernet header with all the extensions.
  50.  *  @see eth_header_ex
  51.  */
  52. typedef struct eth_header_ex    eth_header_ex_t;
  53.  
  54. /** Type definition of the Ethernet header with all the extensions pointer.
  55.  *  @see eth_header
  56.  */
  57. typedef eth_header_ex_t *       eth_header_ex_ref;
  58.  
  59. /** Type definition of the Ethernet header LSAP extension.
  60.  *  @see eth_header_lsap
  61.  */
  62. typedef struct eth_header_lsap  eth_header_lsap_t;
  63.  
  64. /** Type definition of the Ethernet header LSAP extension pointer.
  65.  *  @see eth_header_lsap
  66.  */
  67. typedef eth_header_lsap_t *     eth_header_lsap_ref;
  68.  
  69. /** Type definition of the Ethernet header SNAP extension.
  70.  *  @see eth_header_snap
  71.  */
  72. typedef struct eth_header_snap  eth_header_snap_t;
  73.  
  74. /** Type definition of the Ethernet header SNAP extension pointer.
  75.  *  @see eth_header_snap
  76.  */
  77. typedef eth_header_snap_t *     eth_header_snap_ref;
  78.  
  79. /** Type definition of the Ethernet header.
  80.  *  @see eth_header
  81.  */
  82. typedef struct eth_header   eth_header_t;
  83.  
  84. /** Type definition of the Ethernet header pointer.
  85.  *  @see eth_header
  86.  */
  87. typedef eth_header_t *      eth_header_ref;
  88.  
  89. /** Ethernet header Link Service Access Point extension.
  90.  */
  91. struct eth_header_lsap{
  92.     /** Destination Service Access Point identifier.
  93.      *  The possible values are assigned by an IEEE committee.
  94.      */
  95.     uint8_t     dsap;
  96.     /** Source Service Access Point identifier.
  97.      *  The possible values are assigned by an IEEE committee.
  98.      */
  99.     uint8_t     ssap;
  100.     /** Control parameter.
  101.      *  The possible values are assigned by an IEEE committee.
  102.      */
  103.     uint8_t     ctrl;
  104. };
  105.  
  106. /** Ethernet header SNAP extension.
  107.  */
  108. struct eth_header_snap{
  109.     /** Protocol identifier or organization code.
  110.      */
  111.     uint8_t     proto[ 3 ];
  112.     /** Ethernet protocol identifier in the network byte order (big endian).
  113.      *  @see ethernet_protocols.h
  114.      */
  115.     uint16_t    ethertype;
  116. };
  117.  
  118. /** Ethernet header.
  119.  */
  120. struct eth_header{
  121.     /** Controlling preamble used for the frame transmission synchronization.
  122.      *  All should be set to ETH_PREAMBLE.
  123.      */
  124.     uint8_t     preamble[ 7 ];
  125.     /** Start of Frame Delimiter used for the frame transmission synchronization.
  126.      *  Should be set to ETH_SFD.
  127.      */
  128.     uint8_t     sfd;
  129.     /** Destination host Ethernet address (MAC address).
  130.      */
  131.     uint8_t     dest[ ETH_ADDR ];
  132.     /** Source host Ethernet address (MAC address).
  133.      */
  134.     uint8_t     src[ ETH_ADDR ];
  135.     /** Ethernet protocol identifier in the network byte order (big endian).
  136.      *  @see ethernet_protocols.h
  137.      */
  138.     uint16_t    ethertype;
  139. };
  140.  
  141. /** Ethernet header with all the extensions.
  142.  */
  143. struct eth_header_ex{
  144.     /** Ethernet header.
  145.      */
  146.     eth_header_t        header;
  147.     /** LSAP extension.
  148.      *  If DSAP and SSAP are set to ETH_LSAP_SNAP the SNAP extension is being used.
  149.      *  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.
  150.      */
  151.     eth_header_lsap_t   lsap;
  152.     /** SNAP extension.
  153.      */
  154.     eth_header_snap_t   snap;
  155. };
  156.  
  157. /** Ethernet Frame Check Sequence.
  158.  */
  159. typedef uint32_t        eth_fcs_t;
  160.  
  161. /** Ethernet Frame Check Sequence pointer.
  162.  */
  163. typedef eth_fcs_t *     eth_fcs_ref;
  164.  
  165. #endif
  166.  
  167. /** @}
  168.  */
  169.