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