sys/net/if_llc.h

   1 /*      $NetBSD: if_llc.h,v 1.12 1999/11/19 20:41:19 thorpej Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 4. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)if_llc.h    8.1 (Berkeley) 6/10/93
  32  * $FreeBSD$
  33  */
  34
  35 #ifndef _NET_IF_LLC_H_
  36 #define _NET_IF_LLC_H_
  37
  38 /*
  39  * IEEE 802.2 Link Level Control headers, for use in conjunction with
  40  * 802.{3,4,5} media access control methods.
  41  *
  42  * Headers here do not use bit fields due to shortcommings in many
  43  * compilers.
  44  */
  45
  46 struct llc {
  47         u_int8_t llc_dsap;
  48         u_int8_t llc_ssap;
  49         union {
  50             struct {
  51                 u_int8_t control;
  52                 u_int8_t format_id;
  53                 u_int8_t class;
  54                 u_int8_t window_x2;
  55             } __packed type_u;
  56             struct {
  57                 u_int8_t num_snd_x2;
  58                 u_int8_t num_rcv_x2;
  59             } __packed type_i;
  60             struct {
  61                 u_int8_t control;
  62                 u_int8_t num_rcv_x2;
  63             } __packed type_s;
  64             struct {
  65                 u_int8_t control;
  66                 /*
  67                  * We cannot put the following fields in a structure because
  68                  * the structure rounding might cause padding.
  69                  */
  70                 u_int8_t frmr_rej_pdu0;
  71                 u_int8_t frmr_rej_pdu1;
  72                 u_int8_t frmr_control;
  73                 u_int8_t frmr_control_ext;
  74                 u_int8_t frmr_cause;
  75             } __packed type_frmr;
  76             struct {
  77                 u_int8_t  control;
  78                 u_int8_t  org_code[3];
  79                 u_int16_t ether_type;
  80             } __packed type_snap;
  81             struct {
  82                 u_int8_t control;
  83                 u_int8_t control_ext;
  84             } __packed type_raw;
  85         } __packed llc_un;
  86 } __packed;
  87
  88 struct frmrinfo {
  89         u_int8_t frmr_rej_pdu0;
  90         u_int8_t frmr_rej_pdu1;
  91         u_int8_t frmr_control;
  92         u_int8_t frmr_control_ext;
  93         u_int8_t frmr_cause;
  94 } __packed;
  95
  96 #define llc_control             llc_un.type_u.control
  97 #define llc_control_ext         llc_un.type_raw.control_ext
  98 #define llc_fid                 llc_un.type_u.format_id
  99 #define llc_class               llc_un.type_u.class
 100 #define llc_window              llc_un.type_u.window_x2
 101 #define llc_frmrinfo            llc_un.type_frmr.frmr_rej_pdu0
 102 #define llc_frmr_pdu0           llc_un.type_frmr.frmr_rej_pdu0
 103 #define llc_frmr_pdu1           llc_un.type_frmr.frmr_rej_pdu1
 104 #define llc_frmr_control        llc_un.type_frmr.frmr_control
 105 #define llc_frmr_control_ext    llc_un.type_frmr.frmr_control_ext
 106 #define llc_frmr_cause          llc_un.type_frmr.frmr_cause
 107 #define llc_snap                llc_un.type_snap
 108
 109 /*
 110  * Don't use sizeof(struct llc_un) for LLC header sizes
 111  */
 112 #define LLC_ISFRAMELEN 4
 113 #define LLC_UFRAMELEN  3
 114 #define LLC_FRMRLEN    7
 115 #define LLC_SNAPFRAMELEN 8
 116
 117 #ifdef CTASSERT
 118 CTASSERT(sizeof (struct llc) == LLC_SNAPFRAMELEN);
 119 #endif
 120
 121 /*
 122  * Unnumbered LLC format commands
 123  */
 124 #define LLC_UI          0x3
 125 #define LLC_UI_P        0x13
 126 #define LLC_DISC        0x43
 127 #define LLC_DISC_P      0x53
 128 #define LLC_UA          0x63
 129 #define LLC_UA_P        0x73
 130 #define LLC_TEST        0xe3
 131 #define LLC_TEST_P      0xf3
 132 #define LLC_FRMR        0x87
 133 #define LLC_FRMR_P      0x97
 134 #define LLC_DM          0x0f
 135 #define LLC_DM_P        0x1f
 136 #define LLC_XID         0xaf
 137 #define LLC_XID_P       0xbf
 138 #define LLC_SABME       0x6f
 139 #define LLC_SABME_P     0x7f
 140
 141 /*
 142  * Supervisory LLC commands
 143  */
 144 #define LLC_RR          0x01
 145 #define LLC_RNR         0x05
 146 #define LLC_REJ         0x09
 147
 148 /*
 149  * Info format - dummy only
 150  */
 151 #define LLC_INFO        0x00
 152
 153 /*
 154  * ISO PDTR 10178 contains among others
 155  */
 156 #define LLC_8021D_LSAP  0x42
 157 #define LLC_X25_LSAP    0x7e
 158 #define LLC_SNAP_LSAP   0xaa
 159 #define LLC_ISO_LSAP    0xfe
 160
 161 #endif /* _NET_IF_LLC_H_ */