igmp.h revision 2169 
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 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by the University of
20 *	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	@(#)igmp.h	8.1 (Berkeley) 6/10/93
38 * $Id: igmp.h,v 1.2 1994/08/02 07:48:07 davidg Exp $
39 */
40
41#ifndef _NETINET_IGMP_H_
42#define _NETINET_IGMP_H_
43
44/* Internet Group Management Protocol (IGMP) definitions. */
45
46/*
47 * IGMP packet format.
48 */
49struct igmp {
50	u_char		igmp_type;	/* version & type of IGMP message  */
51	u_char		igmp_code;	/* unused, should be zero          */
52	u_short		igmp_cksum;	/* IP-style checksum               */
53	struct in_addr	igmp_group;	/* group address being reported    */
54};					/*  (zero for queries)             */
55
56#define IGMP_MINLEN		     8
57
58#define IGMP_HOST_MEMBERSHIP_QUERY   0x11  /* message types, incl. version */
59#define IGMP_HOST_MEMBERSHIP_REPORT  0x12
60#define IGMP_DVMRP		     0x13  /* for experimental multicast   */
61					   /*  routing protocol            */
62
63#define IGMP_MAX_HOST_REPORT_DELAY   10    /* max delay for response to    */
64
65#endif
66