master
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
47struct 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
89struct 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
119CTASSERT(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_ */