if_llc.h

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    1 /*      $NetBSD: if_llc.h,v 1.23 2021/02/03 18:13:13 roy 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_u;
   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 };
   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 };
   94 
   95 #ifdef __CTASSERT
   96 __CTASSERT(sizeof(struct llc) == 8);
   97 __CTASSERT(sizeof(struct frmrinfo) == 5);
   98 #endif
   99 
  100 #define llc_control             llc_un.type_u.control
  101 #define llc_control_ext         llc_un.type_raw.control_ext
  102 #define llc_fid                 llc_un.type_u.format_id
  103 #define llc_class               llc_un.type_u.class_u
  104 #define llc_window              llc_un.type_u.window_x2
  105 #define llc_frmrinfo            llc_un.type_frmr.frmr_rej_pdu0
  106 #define llc_frmr_pdu0           llc_un.type_frmr.frmr_rej_pdu0
  107 #define llc_frmr_pdu1           llc_un.type_frmr.frmr_rej_pdu1
  108 #define llc_frmr_control        llc_un.type_frmr.frmr_control
  109 #define llc_frmr_control_ext    llc_un.type_frmr.frmr_control_ext
  110 #define llc_frmr_cause          llc_un.type_frmr.frmr_cause
  111 #define llc_snap                llc_un.type_snap
  112 
  113 /*
  114  * Don't use sizeof(struct llc_un) for LLC header sizes
  115  */
  116 #define LLC_ISFRAMELEN 4
  117 #define LLC_UFRAMELEN  3
  118 #define LLC_FRMRLEN    7
  119 #define LLC_SNAPFRAMELEN 8
  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 /*
  162  * LLC XID definitions from 802.2, as needed
  163  */
  164 
  165 #define LLC_XID_FORMAT_BASIC    0x81
  166 #define LLC_XID_BASIC_MINLEN    (LLC_UFRAMELEN + 3)
  167 
  168 #define LLC_XID_CLASS_I         0x1
  169 #define LLC_XID_CLASS_II        0x3
  170 #define LLC_XID_CLASS_III       0x5
  171 #define LLC_XID_CLASS_IV        0x7
  172 
  173 
  174 #endif /* !_NET_IF_LLC_H_ */

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sys/net/if_llc.h