igmp.h

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/*
 * Copyright (c) 1988 Stephen Deering.
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Stephen Deering of Stanford University.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)igmp.h      8.1 (Berkeley) 6/10/93
 */

#ifndef _NETINET_IGMP_H_
#define _NETINET_IGMP_H_

#include <netinet/in.h> /* struct in_addr */

/*
 * Internet Group Management Protocol (IGMP) definitions.
 *
 * Written by Steve Deering, Stanford, May 1988.
 *
 * MULTICAST Revision: 3.5.1.2
 */

/*
 * IGMP packet format.
 */
struct igmp {
        u_char          igmp_type;      /* version & type of IGMP message  */
        u_char          igmp_code;      /* subtype for routing msgs        */
        u_short         igmp_cksum;     /* IP-style checksum               */
        struct in_addr  igmp_group;     /* group address being reported    */
};                                      /*  (zero for queries)             */

#define IGMP_MINLEN                  8

/*
 * Message types, including version number.
 */
#define IGMP_MEMBERSHIP_QUERY           0x11    /* membership query         */
#define IGMP_V1_MEMBERSHIP_REPORT       0x12    /* Ver. 1 membership report */
#define IGMP_V2_MEMBERSHIP_REPORT       0x16    /* Ver. 2 membership report */
#define IGMP_V2_LEAVE_GROUP             0x17    /* Leave-group message      */

#define IGMP_DVMRP                      0x13    /* DVMRP routing message    */
#define IGMP_PIM                        0x14    /* PIM routing message      */

#define IGMP_MTRACE_RESP                0x1e  /* traceroute resp.(to sender)*/
#define IGMP_MTRACE                     0x1f  /* mcast traceroute messages  */

#define IGMP_MAX_HOST_REPORT_DELAY   10    /* max delay for response to     */
                                           /*  query (in seconds) according */
                                           /*  to RFC1112                   */


#define IGMP_TIMER_SCALE     10         /* denotes that the igmp code field */
                                        /* specifies time in 10th of seconds*/

/*
 * The following four defininitions are for backwards compatibility.
 * They should be removed as soon as all applications are updated to
 * use the new constant names.
 */
#define IGMP_HOST_MEMBERSHIP_QUERY      IGMP_MEMBERSHIP_QUERY
#define IGMP_HOST_MEMBERSHIP_REPORT     IGMP_V1_MEMBERSHIP_REPORT
#define IGMP_HOST_NEW_MEMBERSHIP_REPORT IGMP_V2_MEMBERSHIP_REPORT
#define IGMP_HOST_LEAVE_MESSAGE         IGMP_V2_LEAVE_GROUP

#endif /* _NETINET_IGMP_H_ */