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_ */