The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/if_llc.h

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    1 /*      $NetBSD: if_llc.h,v 1.12 1999/11/19 20:41:19 thorpej Exp $      */
    2 
    3 /*-
    4  * SPDX-License-Identifier: BSD-3-Clause
    5  *
    6  * Copyright (c) 1988, 1993
    7  *      The Regents of the University of California.  All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)if_llc.h    8.1 (Berkeley) 6/10/93
   34  * $FreeBSD: releng/12.0/sys/net/if_llc.h 326023 2017-11-20 19:43:44Z pfg $
   35  */
   36 
   37 #ifndef _NET_IF_LLC_H_
   38 #define _NET_IF_LLC_H_
   39 
   40 /*
   41  * IEEE 802.2 Link Level Control headers, for use in conjunction with
   42  * 802.{3,4,5} media access control methods.
   43  *
   44  * Headers here do not use bit fields due to shortcommings in many
   45  * compilers.
   46  */
   47 
   48 struct llc {
   49         u_int8_t llc_dsap;
   50         u_int8_t llc_ssap;
   51         union {
   52             struct {
   53                 u_int8_t control;
   54                 u_int8_t format_id;
   55                 u_int8_t class;
   56                 u_int8_t window_x2;
   57             } __packed type_u;
   58             struct {
   59                 u_int8_t num_snd_x2;
   60                 u_int8_t num_rcv_x2;
   61             } __packed type_i;
   62             struct {
   63                 u_int8_t control;
   64                 u_int8_t num_rcv_x2;
   65             } __packed type_s;
   66             struct {
   67                 u_int8_t control;
   68                 /*
   69                  * We cannot put the following fields in a structure because
   70                  * the structure rounding might cause padding.
   71                  */
   72                 u_int8_t frmr_rej_pdu0;
   73                 u_int8_t frmr_rej_pdu1;
   74                 u_int8_t frmr_control;
   75                 u_int8_t frmr_control_ext;
   76                 u_int8_t frmr_cause;
   77             } __packed type_frmr;
   78             struct {
   79                 u_int8_t  control;
   80                 u_int8_t  org_code[3];
   81                 u_int16_t ether_type;
   82             } __packed type_snap;
   83             struct {
   84                 u_int8_t control;
   85                 u_int8_t control_ext;
   86             } __packed type_raw;
   87         } __packed llc_un;
   88 } __packed;
   89 
   90 struct frmrinfo {
   91         u_int8_t frmr_rej_pdu0;
   92         u_int8_t frmr_rej_pdu1;
   93         u_int8_t frmr_control;
   94         u_int8_t frmr_control_ext;
   95         u_int8_t frmr_cause;
   96 } __packed;
   97 
   98 #define llc_control             llc_un.type_u.control
   99 #define llc_control_ext         llc_un.type_raw.control_ext
  100 #define llc_fid                 llc_un.type_u.format_id
  101 #define llc_class               llc_un.type_u.class
  102 #define llc_window              llc_un.type_u.window_x2
  103 #define llc_frmrinfo            llc_un.type_frmr.frmr_rej_pdu0
  104 #define llc_frmr_pdu0           llc_un.type_frmr.frmr_rej_pdu0
  105 #define llc_frmr_pdu1           llc_un.type_frmr.frmr_rej_pdu1
  106 #define llc_frmr_control        llc_un.type_frmr.frmr_control
  107 #define llc_frmr_control_ext    llc_un.type_frmr.frmr_control_ext
  108 #define llc_frmr_cause          llc_un.type_frmr.frmr_cause
  109 #define llc_snap                llc_un.type_snap
  110 
  111 /*
  112  * Don't use sizeof(struct llc_un) for LLC header sizes
  113  */
  114 #define LLC_ISFRAMELEN 4
  115 #define LLC_UFRAMELEN  3
  116 #define LLC_FRMRLEN    7
  117 #define LLC_SNAPFRAMELEN 8
  118 
  119 #ifdef CTASSERT
  120 CTASSERT(sizeof (struct llc) == LLC_SNAPFRAMELEN);
  121 #endif
  122 
  123 /*
  124  * Unnumbered LLC format commands
  125  */
  126 #define LLC_UI          0x3
  127 #define LLC_UI_P        0x13
  128 #define LLC_DISC        0x43
  129 #define LLC_DISC_P      0x53
  130 #define LLC_UA          0x63
  131 #define LLC_UA_P        0x73
  132 #define LLC_TEST        0xe3
  133 #define LLC_TEST_P      0xf3
  134 #define LLC_FRMR        0x87
  135 #define LLC_FRMR_P      0x97
  136 #define LLC_DM          0x0f
  137 #define LLC_DM_P        0x1f
  138 #define LLC_XID         0xaf
  139 #define LLC_XID_P       0xbf
  140 #define LLC_SABME       0x6f
  141 #define LLC_SABME_P     0x7f
  142 
  143 /*
  144  * Supervisory LLC commands
  145  */
  146 #define LLC_RR          0x01
  147 #define LLC_RNR         0x05
  148 #define LLC_REJ         0x09
  149 
  150 /*
  151  * Info format - dummy only
  152  */
  153 #define LLC_INFO        0x00
  154 
  155 /*
  156  * ISO PDTR 10178 contains among others
  157  */
  158 #define LLC_8021D_LSAP  0x42
  159 #define LLC_X25_LSAP    0x7e
  160 #define LLC_SNAP_LSAP   0xaa
  161 #define LLC_ISO_LSAP    0xfe
  162 
  163 #endif /* _NET_IF_LLC_H_ */

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