if_llc.h revision 1.6 
1/*	$NetBSD: if_llc.h,v 1.6 1995/03/08 02:56:57 cgd 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 */
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;
56	    struct {
57		u_int8_t num_snd_x2;
58		u_int8_t num_rcv_x2;
59	    } type_i;
60	    struct {
61		u_int8_t control;
62		u_int8_t num_rcv_x2;
63	    } type_s;
64	    struct {
65	        u_int8_t control;
66		struct frmrinfo {
67			u_int8_t rej_pdu_0;
68			u_int8_t rej_pdu_1;
69			u_int8_t frmr_control;
70			u_int8_t frmr_control_ext;
71			u_int8_t frmr_cause;
72		} frmrinfo;
73	    } type_frmr;
74	    struct {
75		u_int8_t  control;
76		u_int8_t  org_code[3];
77		u_int16_t ether_type;
78	    } type_snap;
79	    struct {
80		u_int8_t control;
81		u_int8_t control_ext;
82	    } type_raw;
83	} llc_un;
84};
85#define llc_control            llc_un.type_u.control
86#define	llc_control_ext        llc_un.type_raw.control_ext
87#define llc_fid                llc_un.type_u.format_id
88#define llc_class              llc_un.type_u.class
89#define llc_window             llc_un.type_u.window_x2
90#define llc_frmrinfo           llc_un.type_frmr.frmrinfo
91#define llc_frmr_pdu0          llc_un.type_frmr.frmrinfo.rej_pdu0
92#define llc_frmr_pdu1          llc_un.type_frmr.frmrinfo.rej_pdu1
93#define llc_frmr_control       llc_un.type_frmr.frmrinfo.frmr_control
94#define llc_frmr_control_ext   llc_un.type_frmr.frmrinfo.frmr_control_ext
95#define llc_frmr_cause         llc_un.type_frmr.frmrinfo.frmr_control_ext
96
97/*
98 * Don't use sizeof(struct llc_un) for LLC header sizes
99 */
100#define LLC_ISFRAMELEN 4
101#define LLC_UFRAMELEN  3
102#define LLC_FRMRLEN    7
103
104/*
105 * Unnumbered LLC format commands
106 */
107#define LLC_UI		0x3
108#define LLC_UI_P	0x13
109#define LLC_DISC	0x43
110#define	LLC_DISC_P	0x53
111#define LLC_UA		0x63
112#define LLC_UA_P	0x73
113#define LLC_TEST	0xe3
114#define LLC_TEST_P	0xf3
115#define LLC_FRMR	0x87
116#define	LLC_FRMR_P	0x97
117#define LLC_DM		0x0f
118#define	LLC_DM_P	0x1f
119#define LLC_XID		0xaf
120#define LLC_XID_P	0xbf
121#define LLC_SABME	0x6f
122#define LLC_SABME_P	0x7f
123
124/*
125 * Supervisory LLC commands
126 */
127#define	LLC_RR		0x01
128#define	LLC_RNR		0x05
129#define	LLC_REJ		0x09
130
131/*
132 * Info format - dummy only
133 */
134#define	LLC_INFO	0x00
135
136/*
137 * ISO PDTR 10178 contains among others
138 */
139#define LLC_X25_LSAP	0x7e
140#define LLC_SNAP_LSAP	0xaa
141#define LLC_ISO_LSAP	0xfe
142