1/*	$NetBSD: igmp.h,v 1.15 2021/02/03 18:13:13 roy Exp $	*/
  2
  3/*
  4 * Copyright (c) 1992, 1993
  5 *	The Regents of the University of California.  All rights reserved.
  6 *
  7 * This code is derived from software contributed to Berkeley by
  8 * Stephen Deering of Stanford University.
  9 *
 10 * Redistribution and use in source and binary forms, with or without
 11 * modification, are permitted provided that the following conditions
 12 * are met:
 13 * 1. Redistributions of source code must retain the above copyright
 14 *    notice, this list of conditions and the following disclaimer.
 15 * 2. Redistributions in binary form must reproduce the above copyright
 16 *    notice, this list of conditions and the following disclaimer in the
 17 *    documentation and/or other materials provided with the distribution.
 18 * 3. Neither the name of the University nor the names of its contributors
 19 *    may be used to endorse or promote products derived from this software
 20 *    without specific prior written permission.
 21 *
 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 32 * SUCH DAMAGE.
 33 *
 34 *	@(#)igmp.h	8.1 (Berkeley) 6/10/93
 35 */
 36
 37/*
 38 * Copyright (c) 1988 Stephen Deering.
 39 *
 40 * This code is derived from software contributed to Berkeley by
 41 * Stephen Deering of Stanford University.
 42 *
 43 * Redistribution and use in source and binary forms, with or without
 44 * modification, are permitted provided that the following conditions
 45 * are met:
 46 * 1. Redistributions of source code must retain the above copyright
 47 *    notice, this list of conditions and the following disclaimer.
 48 * 2. Redistributions in binary form must reproduce the above copyright
 49 *    notice, this list of conditions and the following disclaimer in the
 50 *    documentation and/or other materials provided with the distribution.
 51 * 3. All advertising materials mentioning features or use of this software
 52 *    must display the following acknowledgement:
 53 *	This product includes software developed by the University of
 54 *	California, Berkeley and its contributors.
 55 * 4. Neither the name of the University nor the names of its contributors
 56 *    may be used to endorse or promote products derived from this software
 57 *    without specific prior written permission.
 58 *
 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 62 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 69 * SUCH DAMAGE.
 70 *
 71 *	@(#)igmp.h	8.1 (Berkeley) 6/10/93
 72 */
 73
 74#ifndef _NETINET_IGMP_H_
 75#define _NETINET_IGMP_H_
 76
 77/*
 78 * Internet Group Management Protocol (IGMP) definitions.
 79 *
 80 * MULTICAST 1.3
 81 */
 82
 83/*
 84 * IGMP packet format.
 85 */
 86struct igmp {
 87	uint8_t		igmp_type;	/* version & type of IGMP message  */
 88	uint8_t		igmp_code;	/* code for routing sub-messages   */
 89	uint16_t	igmp_cksum;	/* IP-style checksum               */
 90	struct in_addr	igmp_group;	/* group address being reported    */
 91};			/*  (zero for queries)             */
 92#ifdef __CTASSERT
 93__CTASSERT(sizeof(struct igmp) == 8);
 94#endif
 95
 96#define	IGMP_MINLEN			8
 97
 98#define	IGMP_HOST_MEMBERSHIP_QUERY	0x11  /* membership query      */
 99#define	IGMP_v1_HOST_MEMBERSHIP_REPORT	0x12  /* v1 membership report  */
100#define	IGMP_DVMRP			0x13  /* DVMRP routing message */
101#define	IGMP_PIM			0x14  /* PIM routing message   */
102#define	IGMP_v2_HOST_MEMBERSHIP_REPORT	0x16  /* v2 membership report  */
103#define	IGMP_HOST_LEAVE_MESSAGE		0x17  /* leave-group message   */
104#define	IGMP_MTRACE_REPLY		0x1e  /* traceroute reply      */
105#define	IGMP_MTRACE_QUERY		0x1f  /* traceroute query      */
106
107#define	IGMP_MAX_HOST_REPORT_DELAY	10    /* max delay for response to */
108					      /*  query (in seconds)       */
109
110#define	IGMP_TIMER_SCALE		10    /* denominator for igmp_timer */
111
112/*
113 * States for the IGMP v2 state table.
114 */
115#define	IGMP_DELAYING_MEMBER	1
116#define	IGMP_IDLE_MEMBER	2
117#define	IGMP_LAZY_MEMBER	3
118#define	IGMP_SLEEPING_MEMBER	4
119#define	IGMP_AWAKENING_MEMBER	5
120
121/*
122 * States for IGMP router version cache.
123 */
124#define	IGMP_v1_ROUTER		1
125#define	IGMP_v2_ROUTER		2
126
127/*
128 * Revert to v2 if we haven't heard from the router in this amount of time.
129 */
130#define	IGMP_AGE_THRESHOLD	540
131
132#endif /* !_NETINET_IGMP_H_ */