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 45struct 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 87struct 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 117CTASSERT(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