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igmp.h revision 1.3 
      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  *	from: @(#)igmp.h	8.1 (Berkeley) 6/10/93
     38  *	$Id: igmp.h,v 1.3 1994/05/13 06:06:00 mycroft Exp $
     39  */
     40 
     41 /* Internet Group Management Protocol (IGMP) definitions. */
     42 
     43 /*
     44  * IGMP packet format.
     45  */
     46 struct igmp {
     47 	u_char		igmp_type;	/* version & type of IGMP message  */
     48 	u_char		igmp_code;	/* unused, should be zero          */
     49 	u_short		igmp_cksum;	/* IP-style checksum               */
     50 	struct in_addr	igmp_group;	/* group address being reported    */
     51 };					/*  (zero for queries)             */
     52 
     53 #define	IGMP_MINLEN		     8
     54 
     55 #define	IGMP_HOST_MEMBERSHIP_QUERY   0x11  /* message types, incl. version */
     56 #define	IGMP_HOST_MEMBERSHIP_REPORT  0x12
     57 #define	IGMP_DVMRP		     0x13  /* for experimental multicast   */
     58 					   /*  routing protocol            */
     59 
     60 #define	IGMP_MAX_HOST_REPORT_DELAY   10    /* max delay for response to    */
     61 					   /*  query (in seconds)          */
     62