igmp.h revision 170613 
1/*-
2 * Copyright (c) 1988 Stephen Deering.
3 * Copyright (c) 1992, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Stephen Deering of Stanford University.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
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 *	@(#)igmp.h	8.1 (Berkeley) 6/10/93
34 * $FreeBSD: head/sys/netinet/igmp.h 170613 2007-06-12 16:24:56Z bms $
35 */
36
37#ifndef _NETINET_IGMP_H_
38#define _NETINET_IGMP_H_
39
40/*
41 * Internet Group Management Protocol (IGMP) definitions.
42 *
43 * Written by Steve Deering, Stanford, May 1988.
44 *
45 * MULTICAST Revision: 3.5.1.2
46 */
47
48/*
49 * IGMP packet format.
50 */
51struct igmp {
52	u_char		igmp_type;	/* version & type of IGMP message  */
53	u_char		igmp_code;	/* subtype for routing msgs        */
54	u_short		igmp_cksum;	/* IP-style checksum               */
55	struct in_addr	igmp_group;	/* group address being reported    */
56};					/*  (zero for queries)             */
57
58struct igmpv3 {
59	u_char		igmp_type;	/* version & type of IGMP message  */
60	u_char		igmp_code;	/* subtype for routing msgs        */
61	u_short		igmp_cksum;	/* IP-style checksum               */
62	struct in_addr	igmp_group;	/* group address being reported    */
63					/*  (zero for queries)             */
64	u_char		igmp_misc;	/* reserved/suppress/robustness    */
65	u_char		igmp_qqi;	/* querier's query interval        */
66	u_short		igmp_numsrc;	/* number of sources               */
67	/*struct in_addr	igmp_sources[1];*/ /* source addresses */
68};
69
70struct igmp_grouprec {
71	u_char		ig_type;	/* record type */
72	u_char		ig_datalen;	/* length of auxiliary data */
73	u_short		ig_numsrc;	/* number of sources */
74	struct in_addr	ig_group;	/* group address being reported */
75	/*struct in_addr	ig_sources[1];*/ /* source addresses */
76};
77
78struct igmp_report {
79	u_char		ir_type;	/* record type */
80	u_char		ir_rsv1;	/* reserved */
81	u_short		ir_cksum;	/* checksum */
82	u_short		ir_rsv2;	/* reserved */
83	u_short		ir_numgrps;	/* number of group records */
84	struct		igmp_grouprec ir_groups[1];	/* group records */
85};
86
87#define IGMP_MINLEN			8
88#define IGMP_HDRLEN			8
89#define IGMP_GRPREC_HDRLEN		8
90#define IGMP_PREPEND			0
91
92#define IGMP_QRV(pigmp)			((pigmp)->igmp_misc & (0x07)) /* XXX */
93#define IGMP_MAXSOURCES(len)		(((len) - 12) >> 2) /* XXX */
94
95/*
96 * Message types, including version number.
97 */
98#define IGMP_MEMBERSHIP_QUERY		0x11	/* membership query         */
99#define IGMP_V1_MEMBERSHIP_REPORT	0x12	/* Ver. 1 membership report */
100#define IGMP_V2_MEMBERSHIP_REPORT	0x16	/* Ver. 2 membership report */
101#define IGMP_V2_LEAVE_GROUP		0x17	/* Leave-group message	    */
102
103#define IGMP_DVMRP			0x13	/* DVMRP routing message    */
104#define IGMP_PIM			0x14	/* PIM routing message	    */
105
106#define IGMP_MTRACE_RESP		0x1e  /* traceroute resp.(to sender)*/
107#define IGMP_MTRACE			0x1f  /* mcast traceroute messages  */
108
109#define IGMP_V3_MEMBERSHIP_REPORT	0x22	/* Ver. 3 membership report */
110
111#define IGMP_MAX_HOST_REPORT_DELAY   10    /* max delay for response to     */
112					   /*  query (in seconds) according */
113					   /*  to RFC1112                   */
114
115
116#define IGMP_TIMER_SCALE     10		/* denotes that the igmp code field */
117					/* specifies time in 10th of seconds*/
118
119/*
120 * The following four defininitions are for backwards compatibility.
121 * They should be removed as soon as all applications are updated to
122 * use the new constant names.
123 */
124#define IGMP_HOST_MEMBERSHIP_QUERY	IGMP_MEMBERSHIP_QUERY
125#define IGMP_HOST_MEMBERSHIP_REPORT	IGMP_V1_MEMBERSHIP_REPORT
126#define IGMP_HOST_NEW_MEMBERSHIP_REPORT	IGMP_V2_MEMBERSHIP_REPORT
127#define IGMP_HOST_LEAVE_MESSAGE		IGMP_V2_LEAVE_GROUP
128
129#endif /* _NETINET_IGMP_H_ */
130