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igmp.h revision 1.5 
      1 /*	$NetBSD: igmp.h,v 1.5 1995/04/13 06:26:39 cgd 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 /* Internet Group Management Protocol (IGMP) definitions. */
     43 
     44 /*
     45  * IGMP packet format.
     46  */
     47 struct igmp {
     48 	u_int8_t	igmp_type;	/* version & type of IGMP message  */
     49 	u_int8_t	igmp_code;	/* unused, should be zero          */
     50 	u_int16_t	igmp_cksum;	/* IP-style checksum               */
     51 	struct in_addr	igmp_group;	/* group address being reported    */
     52 };					/*  (zero for queries)             */
     53 
     54 #define	IGMP_MINLEN		     8
     55 
     56 #define	IGMP_HOST_MEMBERSHIP_QUERY   0x11  /* message types, incl. version */
     57 #define	IGMP_HOST_MEMBERSHIP_REPORT  0x12
     58 #define	IGMP_DVMRP		     0x13  /* for experimental multicast   */
     59 					   /*  routing protocol            */
     60 
     61 #define	IGMP_MAX_HOST_REPORT_DELAY   10    /* max delay for response to    */
     62 					   /*  query (in seconds)          */
     63