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  * 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: releng/8.1/sys/net/if_llc.h 164804 2006-12-01 17:50:11Z imp $
   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_ */

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