summaryrefslogtreecommitdiffstats
path: root/sys/net/if_llc.h
blob: 0d96372ed5be86c3bfebf231fc66eac1fea40c0d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
/*	$NetBSD: if_llc.h,v 1.12 1999/11/19 20:41:19 thorpej Exp $	*/

/*-
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)if_llc.h	8.1 (Berkeley) 6/10/93
 * $FreeBSD$
 */

#ifndef _NET_IF_LLC_H_
#define _NET_IF_LLC_H_

/*
 * IEEE 802.2 Link Level Control headers, for use in conjunction with
 * 802.{3,4,5} media access control methods.
 *
 * Headers here do not use bit fields due to shortcommings in many
 * compilers.
 */

struct llc {
	u_int8_t llc_dsap;
	u_int8_t llc_ssap;
	union {
	    struct {
		u_int8_t control;
		u_int8_t format_id;
		u_int8_t class;
		u_int8_t window_x2;
	    } __packed type_u;
	    struct {
		u_int8_t num_snd_x2;
		u_int8_t num_rcv_x2;
	    } __packed type_i;
	    struct {
		u_int8_t control;
		u_int8_t num_rcv_x2;
	    } __packed type_s;
	    struct {
	        u_int8_t control;
		/*
		 * We cannot put the following fields in a structure because
		 * the structure rounding might cause padding.
		 */
		u_int8_t frmr_rej_pdu0;
		u_int8_t frmr_rej_pdu1;
		u_int8_t frmr_control;
		u_int8_t frmr_control_ext;
		u_int8_t frmr_cause;
	    } __packed type_frmr;
	    struct {
		u_int8_t  control;
		u_int8_t  org_code[3];
		u_int16_t ether_type;
	    } __packed type_snap;
	    struct {
		u_int8_t control;
		u_int8_t control_ext;
	    } __packed type_raw;
	} __packed llc_un;
} __packed;

struct frmrinfo {
	u_int8_t frmr_rej_pdu0;
	u_int8_t frmr_rej_pdu1;
	u_int8_t frmr_control;
	u_int8_t frmr_control_ext;
	u_int8_t frmr_cause;
} __packed;

#define	llc_control		llc_un.type_u.control
#define	llc_control_ext		llc_un.type_raw.control_ext
#define	llc_fid			llc_un.type_u.format_id
#define	llc_class		llc_un.type_u.class
#define	llc_window		llc_un.type_u.window_x2
#define	llc_frmrinfo 		llc_un.type_frmr.frmr_rej_pdu0
#define	llc_frmr_pdu0		llc_un.type_frmr.frmr_rej_pdu0
#define	llc_frmr_pdu1		llc_un.type_frmr.frmr_rej_pdu1
#define	llc_frmr_control	llc_un.type_frmr.frmr_control
#define	llc_frmr_control_ext	llc_un.type_frmr.frmr_control_ext
#define	llc_frmr_cause		llc_un.type_frmr.frmr_cause
#define	llc_snap		llc_un.type_snap

/*
 * Don't use sizeof(struct llc_un) for LLC header sizes
 */
#define LLC_ISFRAMELEN 4
#define LLC_UFRAMELEN  3
#define LLC_FRMRLEN    7
#define LLC_SNAPFRAMELEN 8

#ifdef CTASSERT
CTASSERT(sizeof (struct llc) == LLC_SNAPFRAMELEN);
#endif

/*
 * Unnumbered LLC format commands
 */
#define LLC_UI		0x3
#define LLC_UI_P	0x13
#define LLC_DISC	0x43
#define	LLC_DISC_P	0x53
#define LLC_UA		0x63
#define LLC_UA_P	0x73
#define LLC_TEST	0xe3
#define LLC_TEST_P	0xf3
#define LLC_FRMR	0x87
#define	LLC_FRMR_P	0x97
#define LLC_DM		0x0f
#define	LLC_DM_P	0x1f
#define LLC_XID		0xaf
#define LLC_XID_P	0xbf
#define LLC_SABME	0x6f
#define LLC_SABME_P	0x7f

/*
 * Supervisory LLC commands
 */
#define	LLC_RR		0x01
#define	LLC_RNR		0x05
#define	LLC_REJ		0x09

/*
 * Info format - dummy only
 */
#define	LLC_INFO	0x00

/*
 * ISO PDTR 10178 contains among others
 */
#define LLC_8021D_LSAP	0x42
#define LLC_X25_LSAP	0x7e
#define LLC_SNAP_LSAP	0xaa
#define LLC_ISO_LSAP	0xfe

#endif /* _NET_IF_LLC_H_ */
OpenPOWER on IntegriCloud