if_llc.h revision 139823 
1/*	$NetBSD: if_llc.h,v 1.12 1999/11/19 20:41:19 thorpej 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 * 4. 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 * $FreeBSD: head/sys/net/if_llc.h 139823 2005-01-07 01:45:51Z imp $
33 */
34
35#ifndef _NET_IF_LLC_H_
36#define _NET_IF_LLC_H_
37
38/*
39 * IEEE 802.2 Link Level Control headers, for use in conjunction with
40 * 802.{3,4,5} media access control methods.
41 *
42 * Headers here do not use bit fields due to shortcommings in many
43 * compilers.
44 */
45
46struct llc {
47	u_int8_t llc_dsap;
48	u_int8_t llc_ssap;
49	union {
50	    struct {
51		u_int8_t control;
52		u_int8_t format_id;
53		u_int8_t class;
54		u_int8_t window_x2;
55	    } type_u __packed;
56	    struct {
57		u_int8_t num_snd_x2;
58		u_int8_t num_rcv_x2;
59	    } type_i __packed;
60	    struct {
61		u_int8_t control;
62		u_int8_t num_rcv_x2;
63	    } type_s __packed;
64	    struct {
65	        u_int8_t control;
66		/*
67		 * We cannot put the following fields in a structure because
68		 * the structure rounding might cause padding.
69		 */
70		u_int8_t frmr_rej_pdu0;
71		u_int8_t frmr_rej_pdu1;
72		u_int8_t frmr_control;
73		u_int8_t frmr_control_ext;
74		u_int8_t frmr_cause;
75	    } type_frmr __packed;
76	    struct {
77		u_int8_t  control;
78		u_int8_t  org_code[3];
79		u_int16_t ether_type;
80	    } type_snap __packed;
81	    struct {
82		u_int8_t control;
83		u_int8_t control_ext;
84	    } type_raw __packed;
85	} llc_un /* XXX __packed ??? */;
86} __packed;
87
88struct frmrinfo {
89	u_int8_t frmr_rej_pdu0;
90	u_int8_t frmr_rej_pdu1;
91	u_int8_t frmr_control;
92	u_int8_t frmr_control_ext;
93	u_int8_t frmr_cause;
94} __packed;
95
96#define	llc_control		llc_un.type_u.control
97#define	llc_control_ext		llc_un.type_raw.control_ext
98#define	llc_fid			llc_un.type_u.format_id
99#define	llc_class		llc_un.type_u.class
100#define	llc_window		llc_un.type_u.window_x2
101#define	llc_frmrinfo 		llc_un.type_frmr.frmr_rej_pdu0
102#define	llc_frmr_pdu0		llc_un.type_frmr.frmr_rej_pdu0
103#define	llc_frmr_pdu1		llc_un.type_frmr.frmr_rej_pdu1
104#define	llc_frmr_control	llc_un.type_frmr.frmr_control
105#define	llc_frmr_control_ext	llc_un.type_frmr.frmr_control_ext
106#define	llc_frmr_cause		llc_un.type_frmr.frmr_cause
107#define	llc_snap		llc_un.type_snap
108
109/*
110 * Don't use sizeof(struct llc_un) for LLC header sizes
111 */
112#define LLC_ISFRAMELEN 4
113#define LLC_UFRAMELEN  3
114#define LLC_FRMRLEN    7
115#define LLC_SNAPFRAMELEN 8
116
117/*
118 * Unnumbered LLC format commands
119 */
120#define LLC_UI		0x3
121#define LLC_UI_P	0x13
122#define LLC_DISC	0x43
123#define	LLC_DISC_P	0x53
124#define LLC_UA		0x63
125#define LLC_UA_P	0x73
126#define LLC_TEST	0xe3
127#define LLC_TEST_P	0xf3
128#define LLC_FRMR	0x87
129#define	LLC_FRMR_P	0x97
130#define LLC_DM		0x0f
131#define	LLC_DM_P	0x1f
132#define LLC_XID		0xaf
133#define LLC_XID_P	0xbf
134#define LLC_SABME	0x6f
135#define LLC_SABME_P	0x7f
136
137/*
138 * Supervisory LLC commands
139 */
140#define	LLC_RR		0x01
141#define	LLC_RNR		0x05
142#define	LLC_REJ		0x09
143
144/*
145 * Info format - dummy only
146 */
147#define	LLC_INFO	0x00
148
149/*
150 * ISO PDTR 10178 contains among others
151 */
152#define LLC_X25_LSAP	0x7e
153#define LLC_SNAP_LSAP	0xaa
154#define LLC_ISO_LSAP	0xfe
155
156#endif /* _NET_IF_LLC_H_ */
157