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igmp.h revision 1.6 
      1 /*	$NetBSD: igmp.h,v 1.6 1995/05/31 06:08:21 mycroft Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 Stephen Deering.
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * Stephen Deering of Stanford University.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  *
     39  *	@(#)igmp.h	8.1 (Berkeley) 6/10/93
     40  */
     41 
     42 /*
     43  * Internet Group Management Protocol (IGMP) definitions.
     44  *
     45  * MULTICAST 1.3
     46  */
     47 
     48 /*
     49  * IGMP packet format.
     50  */
     51 struct igmp {
     52 	u_int8_t	igmp_type;	/* version & type of IGMP message  */
     53 	u_int8_t	igmp_code;	/* code for routing sub-messages   */
     54 	u_int16_t	igmp_cksum;	/* IP-style checksum               */
     55 	struct in_addr	igmp_group;	/* group address being reported    */
     56 };					/*  (zero for queries)             */
     57 
     58 #define	IGMP_MINLEN		     8
     59 
     60 #define	IGMP_HOST_MEMBERSHIP_QUERY	0x11  /* membership query      */
     61 #define	IGMP_v1_HOST_MEMBERSHIP_REPORT	0x12  /* v1 membership report  */
     62 #define	IGMP_DVMRP			0x13  /* DVMRP routing message */
     63 #define	IGMP_PIM			0x14  /* PIM routing message   */
     64 #define	IGMP_v2_HOST_MEMBERSHIP_REPORT	0x16  /* v2 membership report  */
     65 #define	IGMP_HOST_LEAVE_MESSAGE		0x17  /* leave-group message   */
     66 #define	IGMP_MTRACE_REPLY		0x1e  /* traceroute reply      */
     67 #define	IGMP_MTRACE_QUERY		0x1f  /* traceroute query      */
     68 
     69 #define	IGMP_MAX_HOST_REPORT_DELAY	10    /* max delay for response to */
     70 					      /*  query (in seconds)       */
     71 
     72 #define	IGMP_TIMER_SCALE		10    /* denominator for igmp_timer */
     73 
     74 /*
     75  * States for the IGMP v2 state table.
     76  */
     77 #define	IGMP_DELAYING_MEMBER	1
     78 #define	IGMP_IDLE_MEMBER	2
     79 #define	IGMP_LAZY_MEMBER	3
     80 #define	IGMP_SLEEPING_MEMBER	4
     81 #define	IGMP_AWAKENING_MEMBER	5
     82 
     83 /*
     84  * States for IGMP router version cache.
     85  */
     86 #define	IGMP_v1_ROUTER		1
     87 #define	IGMP_v2_ROUTER		2
     88 
     89 /*
     90  * Revert to v2 if we haven't heard from the router in this amount of time.
     91  */
     92 #define	IGMP_AGE_THRESHOLD	540
     93