1/* $NetBSD: if_llc.h,v 1.23 2021/02/03 18:13:13 roy 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 * 3. 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 */ 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 uint8_t llc_dsap; 47 uint8_t llc_ssap; 48 union { 49 struct { 50 uint8_t control; 51 uint8_t format_id; 52 uint8_t class_u; 53 uint8_t window_x2; 54 } type_u /* XXX __packed ??? */; 55 struct { 56 uint8_t num_snd_x2; 57 uint8_t num_rcv_x2; 58 } type_i /* XXX __packed ??? */; 59 struct { 60 uint8_t control; 61 uint8_t num_rcv_x2; 62 } type_s /* XXX __packed ??? */; 63 struct { 64 uint8_t control; 65 /* 66 * We cannot put the following fields in a structure because 67 * the structure rounding might cause padding. 68 */ 69 uint8_t frmr_rej_pdu0; 70 uint8_t frmr_rej_pdu1; 71 uint8_t frmr_control; 72 uint8_t frmr_control_ext; 73 uint8_t frmr_cause; 74 } type_frmr /* XXX __packed ??? */; 75 struct { 76 uint8_t control; 77 uint8_t org_code[3]; 78 uint16_t ether_type; 79 } type_snap __packed; 80 struct { 81 uint8_t control; 82 uint8_t control_ext; 83 } type_raw /* XXX __packed ??? */; 84 } llc_un /* XXX __packed ??? */; 85}; 86 87struct frmrinfo { 88 uint8_t frmr_rej_pdu0; 89 uint8_t frmr_rej_pdu1; 90 uint8_t frmr_control; 91 uint8_t frmr_control_ext; 92 uint8_t frmr_cause; 93}; 94 95#ifdef __CTASSERT 96__CTASSERT(sizeof(struct llc) == 8); 97__CTASSERT(sizeof(struct frmrinfo) == 5); 98#endif 99 100#define llc_control llc_un.type_u.control 101#define llc_control_ext llc_un.type_raw.control_ext 102#define llc_fid llc_un.type_u.format_id 103#define llc_class llc_un.type_u.class_u 104#define llc_window llc_un.type_u.window_x2 105#define llc_frmrinfo llc_un.type_frmr.frmr_rej_pdu0 106#define llc_frmr_pdu0 llc_un.type_frmr.frmr_rej_pdu0 107#define llc_frmr_pdu1 llc_un.type_frmr.frmr_rej_pdu1 108#define llc_frmr_control llc_un.type_frmr.frmr_control 109#define llc_frmr_control_ext llc_un.type_frmr.frmr_control_ext 110#define llc_frmr_cause llc_un.type_frmr.frmr_cause 111#define llc_snap llc_un.type_snap 112 113/* 114 * Don't use sizeof(struct llc_un) for LLC header sizes 115 */ 116#define LLC_ISFRAMELEN 4 117#define LLC_UFRAMELEN 3 118#define LLC_FRMRLEN 7 119#define LLC_SNAPFRAMELEN 8 120 121/* 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/* 162 * LLC XID definitions from 802.2, as needed 163 */ 164 165#define LLC_XID_FORMAT_BASIC 0x81 166#define LLC_XID_BASIC_MINLEN (LLC_UFRAMELEN + 3) 167 168#define LLC_XID_CLASS_I 0x1 169#define LLC_XID_CLASS_II 0x3 170#define LLC_XID_CLASS_III 0x5 171#define LLC_XID_CLASS_IV 0x7 172 173 174#endif /* !_NET_IF_LLC_H_ */ 175