/*      $OpenBSD: igmp.h,v 1.6 2003/06/02 23:28:13 millert Exp $        */
/*      $NetBSD: igmp.h,v 1.6 1995/05/31 06:08:21 mycroft Exp $ */

/*
 * 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. 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_

/*
 * Internet Group Management Protocol (IGMP) definitions.
 *
 * MULTICAST 1.3
 */

/*
 * IGMP packet format.
 */
struct igmp {
        u_int8_t        igmp_type;      /* version & type of IGMP message  */
        u_int8_t        igmp_code;      /* code for routing sub-messages   */
        u_int16_t       igmp_cksum;     /* IP-style checksum               */
        struct in_addr  igmp_group;     /* group address being reported    */
};                                      /*  (zero for queries)             */

#define IGMP_MINLEN                  8

#define IGMP_HOST_MEMBERSHIP_QUERY      0x11  /* membership query      */
#define IGMP_v1_HOST_MEMBERSHIP_REPORT  0x12  /* v1 membership report  */
#define IGMP_DVMRP                      0x13  /* DVMRP routing message */
#define IGMP_PIM                        0x14  /* PIM routing message   */
#define IGMP_v2_HOST_MEMBERSHIP_REPORT  0x16  /* v2 membership report  */
#define IGMP_HOST_LEAVE_MESSAGE         0x17  /* leave-group message   */
#define IGMP_MTRACE_REPLY               0x1e  /* traceroute reply      */
#define IGMP_MTRACE_QUERY               0x1f  /* traceroute query      */

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

#define IGMP_TIMER_SCALE                10    /* denominator for igmp_timer */

/*
 * States for the IGMP v2 state table.
 */
#define IGMP_DELAYING_MEMBER    1
#define IGMP_IDLE_MEMBER        2
#define IGMP_LAZY_MEMBER        3
#define IGMP_SLEEPING_MEMBER    4
#define IGMP_AWAKENING_MEMBER   5

/*
 * States for IGMP router version cache.
 */
#define IGMP_v1_ROUTER          1
#define IGMP_v2_ROUTER          2

/*
 * Revert to v2 if we haven't heard from the router in this amount of time.
 */
#define IGMP_AGE_THRESHOLD      540

#ifdef _KERNEL
void    rti_delete(struct ifnet *);
#endif /* _KERNEL */
#endif /* _NETINET_IGMP_H_ */