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   1 /*
   2  * Copyright (c) 1993, 1994, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * @(#) $Header: /tcpdump/master/tcpdump/llc.h,v 1.6 1999-10-07 23:47:10 mcr Exp $ (LBL)
  22  */
  23
  24 /*
  25  * This stuff should come from a system header file, but there's no
  26  * obviously portable way to do that and it's not really going
  27  * to change from system to system.
  28  */
  29
  30 /*
  31  * A somewhat abstracted view of the LLC header
  32  */
  33
  34 struct llc {
  35         u_char dsap;
  36         u_char ssap;
  37         union {
  38                 u_char u_ctl;
  39                 u_short is_ctl;
  40                 struct {
  41                         u_char snap_ui;
  42                         u_char snap_pi[5];
  43                 } snap;
  44                 struct {
  45                         u_char snap_ui;
  46                         u_char snap_orgcode[3];
  47                         u_char snap_ethertype[2];
  48                 } snap_ether;
  49         } ctl;
  50 };
  51
  52 #define llcui           ctl.snap.snap_ui
  53 #define llcpi           ctl.snap.snap_pi
  54 #define orgcode         ctl.snap_ether.snap_orgcode
  55 #define ethertype       ctl.snap_ether.snap_ethertype
  56 #define llcis           ctl.is_ctl
  57 #define llcu            ctl.u_ctl
  58
  59 #define LLC_U_FMT       3
  60 #define LLC_GSAP        1
  61 #define LLC_S_FMT       1
  62
  63 #define LLC_U_POLL      0x10
  64 #define LLC_IS_POLL     0x0001
  65 #define LLC_XID_FI      0x81
  66
  67 #define LLC_U_CMD(u)    ((u) & 0xef)
  68 #define LLC_UI          0x03
  69 #define LLC_UA          0x63
  70 #define LLC_DISC        0x43
  71 #define LLC_DM          0x0f
  72 #define LLC_SABME       0x6f
  73 #define LLC_TEST        0xe3
  74 #define LLC_XID         0xaf
  75 #define LLC_FRMR        0x87
  76
  77 #define LLC_S_CMD(is)   (((is) >> 10) & 0x03)
  78 #define LLC_RR          0x0100
  79 #define LLC_RNR         0x0500
  80 #define LLC_REJ         0x0900
  81
  82 #define LLC_IS_NR(is)   (((is) >> 1) & 0x7f)
  83 #define LLC_I_NS(is)    (((is) >> 9) & 0x7f)
  84
  85 #ifndef LLCSAP_NULL
  86 #define LLCSAP_NULL             0x00
  87 #endif
  88 #ifndef LLCSAP_GLOBAL
  89 #define LLCSAP_GLOBAL           0xff
  90 #endif
  91 #ifndef LLCSAP_8021B
  92 #define LLCSAP_8021B_I          0x02
  93 #endif
  94 #ifndef LLCSAP_8021B
  95 #define LLCSAP_8021B_G          0x03
  96 #endif
  97 #ifndef LLCSAP_IP
  98 #define LLCSAP_IP               0x06
  99 #endif
 100 #ifndef LLCSAP_PROWAYNM
 101 #define LLCSAP_PROWAYNM         0x0e
 102 #endif
 103 #ifndef LLCSAP_8021D
 104 #define LLCSAP_8021D            0x42
 105 #endif
 106 #ifndef LLCSAP_RS511
 107 #define LLCSAP_RS511            0x4e
 108 #endif
 109 #ifndef LLCSAP_ISO8208
 110 #define LLCSAP_ISO8208          0x7e
 111 #endif
 112 #ifndef LLCSAP_PROWAY
 113 #define LLCSAP_PROWAY           0x8e
 114 #endif
 115 #ifndef LLCSAP_SNAP
 116 #define LLCSAP_SNAP             0xaa
 117 #endif
 118 #ifndef LLCSAP_ISONS
 119 #define LLCSAP_ISONS            0xfe
 120 #endif