sll.h 5.5 KB

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  1. /*-
  2. * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
  3. * The Regents of the University of California. All rights reserved.
  4. *
  5. * This code is derived from the Stanford/CMU enet packet filter,
  6. * (net/enet.c) distributed as part of 4.3BSD, and code contributed
  7. * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
  8. * Berkeley Laboratory.
  9. *
  10. * Redistribution and use in source and binary forms, with or without
  11. * modification, are permitted provided that the following conditions
  12. * are met:
  13. * 1. Redistributions of source code must retain the above copyright
  14. * notice, this list of conditions and the following disclaimer.
  15. * 2. Redistributions in binary form must reproduce the above copyright
  16. * notice, this list of conditions and the following disclaimer in the
  17. * documentation and/or other materials provided with the distribution.
  18. * 3. All advertising materials mentioning features or use of this software
  19. * must display the following acknowledgement:
  20. * This product includes software developed by the University of
  21. * California, Berkeley and its contributors.
  22. * 4. Neither the name of the University nor the names of its contributors
  23. * may be used to endorse or promote products derived from this software
  24. * without specific prior written permission.
  25. *
  26. * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29. * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36. * SUCH DAMAGE.
  37. *
  38. * @(#) $Header: /home/cvs/tcpreplay/sll.h,v 1.2 2003/12/16 03:58:37 aturner Exp $ (LBL)
  39. */
  40. /*
  41. * For captures on Linux cooked sockets, we construct a fake header
  42. * that includes:
  43. *
  44. * a 2-byte "packet type" which is one of:
  45. *
  46. * LINUX_SLL_HOST packet was sent to us
  47. * LINUX_SLL_BROADCAST packet was broadcast
  48. * LINUX_SLL_MULTICAST packet was multicast
  49. * LINUX_SLL_OTHERHOST packet was sent to somebody else
  50. * LINUX_SLL_OUTGOING packet was sent *by* us;
  51. *
  52. * a 2-byte Ethernet protocol field;
  53. *
  54. * a 2-byte link-layer type;
  55. *
  56. * a 2-byte link-layer address length;
  57. *
  58. * an 8-byte source link-layer address, whose actual length is
  59. * specified by the previous value.
  60. *
  61. * All fields except for the link-layer address are in network byte order.
  62. *
  63. * DO NOT change the layout of this structure, or change any of the
  64. * LINUX_SLL_ values below. If you must change the link-layer header
  65. * for a "cooked" Linux capture, introduce a new DLT_ type (ask
  66. * "tcpdump-workers@tcpdump.org" for one, so that you don't give it a
  67. * value that collides with a value already being used), and use the
  68. * new header in captures of that type, so that programs that can
  69. * handle DLT_LINUX_SLL captures will continue to handle them correctly
  70. * without any change, and so that capture files with different headers
  71. * can be told apart and programs that read them can dissect the
  72. * packets in them.
  73. */
  74. #ifndef _SLL_H_
  75. #define _SLL_H_
  76. /*
  77. * A DLT_LINUX_SLL fake link-layer header.
  78. */
  79. #define SLL_HDR_LEN 16 /* total header length */
  80. #define SLL_ADDRLEN 8 /* length of address field */
  81. struct sll_header {
  82. u_int16_t sll_pkttype; /* packet type */
  83. u_int16_t sll_hatype; /* link-layer address type */
  84. u_int16_t sll_halen; /* link-layer address length */
  85. u_int8_t sll_addr[SLL_ADDRLEN]; /* link-layer address */
  86. u_int16_t sll_protocol; /* protocol */
  87. };
  88. /*
  89. * The LINUX_SLL_ values for "sll_pkttype"; these correspond to the
  90. * PACKET_ values on Linux, but are defined here so that they're
  91. * available even on systems other than Linux, and so that they
  92. * don't change even if the PACKET_ values change.
  93. */
  94. #define LINUX_SLL_HOST 0
  95. #define LINUX_SLL_BROADCAST 1
  96. #define LINUX_SLL_MULTICAST 2
  97. #define LINUX_SLL_OTHERHOST 3
  98. #define LINUX_SLL_OUTGOING 4
  99. /*
  100. * The LINUX_SLL_ values for "sll_protocol"; these correspond to the
  101. * ETH_P_ values on Linux, but are defined here so that they're
  102. * available even on systems other than Linux. We assume, for now,
  103. * that the ETH_P_ values won't change in Linux; if they do, then:
  104. *
  105. * if we don't translate them in "pcap-linux.c", capture files
  106. * won't necessarily be readable if captured on a system that
  107. * defines ETH_P_ values that don't match these values;
  108. *
  109. * if we do translate them in "pcap-linux.c", that makes life
  110. * unpleasant for the BPF code generator, as the values you test
  111. * for in the kernel aren't the values that you test for when
  112. * reading a capture file, so the fixup code run on BPF programs
  113. * handed to the kernel ends up having to do more work.
  114. *
  115. * Add other values here as necessary, for handling packet types that
  116. * might show up on non-Ethernet, non-802.x networks. (Not all the ones
  117. * in the Linux "if_ether.h" will, I suspect, actually show up in
  118. * captures.)
  119. */
  120. #define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */
  121. #define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */
  122. #endif