/*      $NetBSD: igmp.h,v 1.15 2021/02/03 18:13:13 roy Exp $    */

/*
* 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
*/

/*
* Copyright (c) 1988 Stephen Deering.
*
* 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_

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

/*
* IGMP packet format.
*/
struct igmp {
       uint8_t         igmp_type;      /* version & type of IGMP message  */
       uint8_t         igmp_code;      /* code for routing sub-messages   */
       uint16_t        igmp_cksum;     /* IP-style checksum               */
       struct in_addr  igmp_group;     /* group address being reported    */
};                      /*  (zero for queries)             */
#ifdef __CTASSERT
__CTASSERT(sizeof(struct igmp) == 8);
#endif

#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

#endif /* !_NETINET_IGMP_H_ */

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