if_llc.h revision 1542 
1/*
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. 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 *      @(#)if_llc.h	8.1 (Berkeley) 6/10/93
34 */
35
36/*
37 * IEEE 802.2 Link Level Control headers, for use in conjunction with
38 * 802.{3,4,5} media access control methods.
39 *
40 * Headers here do not use bit fields due to shortcommings in many
41 * compilers.
42 */
43
44struct llc {
45	u_char	llc_dsap;
46	u_char	llc_ssap;
47	union {
48	    struct {
49		u_char control;
50		u_char format_id;
51		u_char class;
52		u_char window_x2;
53	    } type_u;
54	    struct {
55		u_char num_snd_x2;
56		u_char num_rcv_x2;
57	    } type_i;
58	    struct {
59		u_char control;
60		u_char num_rcv_x2;
61	    } type_s;
62	    struct {
63	        u_char control;
64		struct frmrinfo {
65			u_char rej_pdu_0;
66			u_char rej_pdu_1;
67			u_char frmr_control;
68			u_char frmr_control_ext;
69			u_char frmr_cause;
70		} frmrinfo;
71	    } type_frmr;
72	    struct {
73		u_char control;
74		u_char org_code[3];
75		u_short ether_type;
76	    } type_snap;
77	    struct {
78		u_char control;
79		u_char control_ext;
80	    } type_raw;
81	} llc_un;
82};
83#define llc_control            llc_un.type_u.control
84#define	llc_control_ext        llc_un.type_raw.control_ext
85#define llc_fid                llc_un.type_u.format_id
86#define llc_class              llc_un.type_u.class
87#define llc_window             llc_un.type_u.window_x2
88#define llc_frmrinfo           llc_un.type_frmr.frmrinfo
89#define llc_frmr_pdu0          llc_un.type_frmr.frmrinfo.rej_pdu0
90#define llc_frmr_pdu1          llc_un.type_frmr.frmrinfo.rej_pdu1
91#define llc_frmr_control       llc_un.type_frmr.frmrinfo.frmr_control
92#define llc_frmr_control_ext   llc_un.type_frmr.frmrinfo.frmr_control_ext
93#define llc_frmr_cause         llc_un.type_frmr.frmrinfo.frmr_control_ext
94
95/*
96 * Don't use sizeof(struct llc_un) for LLC header sizes
97 */
98#define LLC_ISFRAMELEN 4
99#define LLC_UFRAMELEN  3
100#define LLC_FRMRLEN    7
101
102/*
103 * Unnumbered LLC format commands
104 */
105#define LLC_UI		0x3
106#define LLC_UI_P	0x13
107#define LLC_DISC	0x43
108#define	LLC_DISC_P	0x53
109#define LLC_UA		0x63
110#define LLC_UA_P	0x73
111#define LLC_TEST	0xe3
112#define LLC_TEST_P	0xf3
113#define LLC_FRMR	0x87
114#define	LLC_FRMR_P	0x97
115#define LLC_DM		0x0f
116#define	LLC_DM_P	0x1f
117#define LLC_XID		0xaf
118#define LLC_XID_P	0xbf
119#define LLC_SABME	0x6f
120#define LLC_SABME_P	0x7f
121
122/*
123 * Supervisory LLC commands
124 */
125#define	LLC_RR		0x01
126#define	LLC_RNR		0x05
127#define	LLC_REJ		0x09
128
129/*
130 * Info format - dummy only
131 */
132#define	LLC_INFO	0x00
133
134/*
135 * ISO PDTR 10178 contains among others
136 */
137#define LLC_X25_LSAP	0x7e
138#define LLC_SNAP_LSAP	0xaa
139#define LLC_ISO_LSAP	0xfe
140
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