1 /* $NetBSD: igmp.h,v 1.4 1994/06/29 06:37:58 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_char igmp_type; /* version & type of IGMP message */ 49 u_char igmp_code; /* unused, should be zero */ 50 u_short 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