sys/net/if_llc.h

   1 /*      $NetBSD: if_llc.h,v 1.19 2008/02/20 17:05:53 matt 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  * 3. 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  */
  33
  34 #ifndef _NET_IF_LLC_H_
  35 #define _NET_IF_LLC_H_
  36
  37 /*
  38  * IEEE 802.2 Link Level Control headers, for use in conjunction with
  39  * 802.{3,4,5} media access control methods.
  40  *
  41  * Headers here do not use bit fields due to shortcommings in many
  42  * compilers.
  43  */
  44
  45 struct llc {
  46         uint8_t llc_dsap;
  47         uint8_t llc_ssap;
  48         union {
  49             struct {
  50                 uint8_t control;
  51                 uint8_t format_id;
  52                 uint8_t class;
  53                 uint8_t window_x2;
  54             } type_u /* XXX __packed ??? */;
  55             struct {
  56                 uint8_t num_snd_x2;
  57                 uint8_t num_rcv_x2;
  58             } type_i /* XXX __packed ??? */;
  59             struct {
  60                 uint8_t control;
  61                 uint8_t num_rcv_x2;
  62             } type_s /* XXX __packed ??? */;
  63             struct {
  64                 uint8_t control;
  65                 /*
  66                  * We cannot put the following fields in a structure because
  67                  * the structure rounding might cause padding.
  68                  */
  69                 uint8_t frmr_rej_pdu0;
  70                 uint8_t frmr_rej_pdu1;
  71                 uint8_t frmr_control;
  72                 uint8_t frmr_control_ext;
  73                 uint8_t frmr_cause;
  74             } type_frmr /* XXX __packed ??? */;
  75             struct {
  76                 uint8_t  control;
  77                 uint8_t  org_code[3];
  78                 uint16_t ether_type;
  79             } type_snap __packed;
  80             struct {
  81                 uint8_t control;
  82                 uint8_t control_ext;
  83             } type_raw /* XXX __packed ??? */;
  84         } llc_un /* XXX __packed ??? */;
  85 } __packed;
  86
  87 struct frmrinfo {
  88         uint8_t frmr_rej_pdu0;
  89         uint8_t frmr_rej_pdu1;
  90         uint8_t frmr_control;
  91         uint8_t frmr_control_ext;
  92         uint8_t frmr_cause;
  93 } __packed;
  94
  95 #define llc_control             llc_un.type_u.control
  96 #define llc_control_ext         llc_un.type_raw.control_ext
  97 #define llc_fid                 llc_un.type_u.format_id
  98 #define llc_class               llc_un.type_u.class
  99 #define llc_window              llc_un.type_u.window_x2
 100 #define llc_frmrinfo            llc_un.type_frmr.frmr_rej_pdu0
 101 #define llc_frmr_pdu0           llc_un.type_frmr.frmr_rej_pdu0
 102 #define llc_frmr_pdu1           llc_un.type_frmr.frmr_rej_pdu1
 103 #define llc_frmr_control        llc_un.type_frmr.frmr_control
 104 #define llc_frmr_control_ext    llc_un.type_frmr.frmr_control_ext
 105 #define llc_frmr_cause          llc_un.type_frmr.frmr_cause
 106 #define llc_snap                llc_un.type_snap
 107
 108 /*
 109  * Don't use sizeof(struct llc_un) for LLC header sizes
 110  */
 111 #define LLC_ISFRAMELEN 4
 112 #define LLC_UFRAMELEN  3
 113 #define LLC_FRMRLEN    7
 114 #define LLC_SNAPFRAMELEN 8
 115
 116 /*
 117  * Unnumbered LLC format commands
 118  */
 119 #define LLC_UI          0x3
 120 #define LLC_UI_P        0x13
 121 #define LLC_DISC        0x43
 122 #define LLC_DISC_P      0x53
 123 #define LLC_UA          0x63
 124 #define LLC_UA_P        0x73
 125 #define LLC_TEST        0xe3
 126 #define LLC_TEST_P      0xf3
 127 #define LLC_FRMR        0x87
 128 #define LLC_FRMR_P      0x97
 129 #define LLC_DM          0x0f
 130 #define LLC_DM_P        0x1f
 131 #define LLC_XID         0xaf
 132 #define LLC_XID_P       0xbf
 133 #define LLC_SABME       0x6f
 134 #define LLC_SABME_P     0x7f
 135
 136 /*
 137  * Supervisory LLC commands
 138  */
 139 #define LLC_RR          0x01
 140 #define LLC_RNR         0x05
 141 #define LLC_REJ         0x09
 142
 143 /*
 144  * Info format - dummy only
 145  */
 146 #define LLC_INFO        0x00
 147
 148 /*
 149  * ISO PDTR 10178 contains among others
 150  */
 151 #define LLC_8021D_LSAP  0x42
 152 #define LLC_X25_LSAP    0x7e
 153 #define LLC_SNAP_LSAP   0xaa
 154 #define LLC_ISO_LSAP    0xfe
 155
 156 /*
 157  * LLC XID definitions from 802.2, as needed
 158  */
 159
 160 #define LLC_XID_FORMAT_BASIC    0x81
 161 #define LLC_XID_BASIC_MINLEN    (LLC_UFRAMELEN + 3)
 162
 163 #define LLC_XID_CLASS_I         0x1
 164 #define LLC_XID_CLASS_II        0x3
 165 #define LLC_XID_CLASS_III       0x5
 166 #define LLC_XID_CLASS_IV        0x7
 167
 168
 169 #endif /* !_NET_IF_LLC_H_ */