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 * $FreeBSD$ 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_ */ 164