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 */ 35 36 #ifndef _NET_IF_LLC_H_ 37 #define _NET_IF_LLC_H_ 38 39 /* 40 * IEEE 802.2 Link Level Control headers, for use in conjunction with 41 * 802.{3,4,5} media access control methods. 42 * 43 * Headers here do not use bit fields due to shortcommings in many 44 * compilers. 45 */ 46 47 struct llc { 48 u_int8_t llc_dsap; 49 u_int8_t llc_ssap; 50 union { 51 struct { 52 u_int8_t control; 53 u_int8_t format_id; 54 u_int8_t class; 55 u_int8_t window_x2; 56 } __packed type_u; 57 struct { 58 u_int8_t num_snd_x2; 59 u_int8_t num_rcv_x2; 60 } __packed type_i; 61 struct { 62 u_int8_t control; 63 u_int8_t num_rcv_x2; 64 } __packed type_s; 65 struct { 66 u_int8_t control; 67 /* 68 * We cannot put the following fields in a structure because 69 * the structure rounding might cause padding. 70 */ 71 u_int8_t frmr_rej_pdu0; 72 u_int8_t frmr_rej_pdu1; 73 u_int8_t frmr_control; 74 u_int8_t frmr_control_ext; 75 u_int8_t frmr_cause; 76 } __packed type_frmr; 77 struct { 78 u_int8_t control; 79 u_int8_t org_code[3]; 80 u_int16_t ether_type; 81 } __packed type_snap; 82 struct { 83 u_int8_t control; 84 u_int8_t control_ext; 85 } __packed type_raw; 86 } __packed llc_un; 87 } __packed; 88 89 struct frmrinfo { 90 u_int8_t frmr_rej_pdu0; 91 u_int8_t frmr_rej_pdu1; 92 u_int8_t frmr_control; 93 u_int8_t frmr_control_ext; 94 u_int8_t frmr_cause; 95 } __packed; 96 97 #define llc_control llc_un.type_u.control 98 #define llc_control_ext llc_un.type_raw.control_ext 99 #define llc_fid llc_un.type_u.format_id 100 #define llc_class llc_un.type_u.class 101 #define llc_window llc_un.type_u.window_x2 102 #define llc_frmrinfo llc_un.type_frmr.frmr_rej_pdu0 103 #define llc_frmr_pdu0 llc_un.type_frmr.frmr_rej_pdu0 104 #define llc_frmr_pdu1 llc_un.type_frmr.frmr_rej_pdu1 105 #define llc_frmr_control llc_un.type_frmr.frmr_control 106 #define llc_frmr_control_ext llc_un.type_frmr.frmr_control_ext 107 #define llc_frmr_cause llc_un.type_frmr.frmr_cause 108 #define llc_snap llc_un.type_snap 109 110 /* 111 * Don't use sizeof(struct llc_un) for LLC header sizes 112 */ 113 #define LLC_ISFRAMELEN 4 114 #define LLC_UFRAMELEN 3 115 #define LLC_FRMRLEN 7 116 #define LLC_SNAPFRAMELEN 8 117 118 #ifdef CTASSERT 119 CTASSERT(sizeof (struct llc) == LLC_SNAPFRAMELEN); 120 #endif 121 122 /* 123 * Unnumbered LLC format commands 124 */ 125 #define LLC_UI 0x3 126 #define LLC_UI_P 0x13 127 #define LLC_DISC 0x43 128 #define LLC_DISC_P 0x53 129 #define LLC_UA 0x63 130 #define LLC_UA_P 0x73 131 #define LLC_TEST 0xe3 132 #define LLC_TEST_P 0xf3 133 #define LLC_FRMR 0x87 134 #define LLC_FRMR_P 0x97 135 #define LLC_DM 0x0f 136 #define LLC_DM_P 0x1f 137 #define LLC_XID 0xaf 138 #define LLC_XID_P 0xbf 139 #define LLC_SABME 0x6f 140 #define LLC_SABME_P 0x7f 141 142 /* 143 * Supervisory LLC commands 144 */ 145 #define LLC_RR 0x01 146 #define LLC_RNR 0x05 147 #define LLC_REJ 0x09 148 149 /* 150 * Info format - dummy only 151 */ 152 #define LLC_INFO 0x00 153 154 /* 155 * ISO PDTR 10178 contains among others 156 */ 157 #define LLC_8021D_LSAP 0x42 158 #define LLC_X25_LSAP 0x7e 159 #define LLC_SNAP_LSAP 0xaa 160 #define LLC_ISO_LSAP 0xfe 161 162 #endif /* _NET_IF_LLC_H_ */ 163