if_llc.h revision 93366 
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 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *	@(#)if_llc.h	8.1 (Berkeley) 6/10/93
36 * $FreeBSD: head/sys/net/if_llc.h 93366 2002-03-29 06:58:45Z mdodd $
37 */
38
39#ifndef _NET_IF_LLC_H_
40#define _NET_IF_LLC_H_
41
42/*
43 * IEEE 802.2 Link Level Control headers, for use in conjunction with
44 * 802.{3,4,5} media access control methods.
45 *
46 * Headers here do not use bit fields due to shortcommings in many
47 * compilers.
48 */
49
50struct llc {
51	u_int8_t llc_dsap;
52	u_int8_t llc_ssap;
53	union {
54	    struct {
55		u_int8_t control;
56		u_int8_t format_id;
57		u_int8_t class;
58		u_int8_t window_x2;
59	    } type_u __attribute__((__packed__));
60	    struct {
61		u_int8_t num_snd_x2;
62		u_int8_t num_rcv_x2;
63	    } type_i __attribute__((__packed__));
64	    struct {
65		u_int8_t control;
66		u_int8_t num_rcv_x2;
67	    } type_s __attribute__((__packed__));
68	    struct {
69	        u_int8_t control;
70		/*
71		 * We cannot put the following fields in a structure because
72		 * the structure rounding might cause padding.
73		 */
74		u_int8_t frmr_rej_pdu0;
75		u_int8_t frmr_rej_pdu1;
76		u_int8_t frmr_control;
77		u_int8_t frmr_control_ext;
78		u_int8_t frmr_cause;
79	    } type_frmr __attribute__((__packed__));
80	    struct {
81		u_int8_t  control;
82		u_int8_t  org_code[3];
83		u_int16_t ether_type;
84	    } type_snap __attribute__((__packed__));
85	    struct {
86		u_int8_t control;
87		u_int8_t control_ext;
88	    } type_raw __attribute__((__packed__));
89	} llc_un /* XXX __attribute__((__packed__)) ??? */;
90} __attribute__((__packed__));
91
92struct frmrinfo {
93	u_int8_t frmr_rej_pdu0;
94	u_int8_t frmr_rej_pdu1;
95	u_int8_t frmr_control;
96	u_int8_t frmr_control_ext;
97	u_int8_t frmr_cause;
98} __attribute__((__packed__));
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
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_X25_LSAP	0x7e
157#define LLC_SNAP_LSAP	0xaa
158#define LLC_ISO_LSAP	0xfe
159
160#endif /* _NET_IF_LLC_H_ */
161