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