text: /*-
   * 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.
   * 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
   * $FreeBSD: release/9.0.0/sys/netinet/igmp.h 193938 2009-06-10 18:12:15Z imp $
   */
  
  #ifndef _NETINET_IGMP_H_
  #define _NETINET_IGMP_H_
  
  /*
   * Internet Group Management Protocol (IGMP) definitions.
   *
   * Written by Steve Deering, Stanford, May 1988.
   *
   * MULTICAST Revision: 3.5.1.2
   */
  
  /* Minimum length of any IGMP protocol message. */
  #define IGMP_MINLEN			8
  
  /*
   * IGMPv1/v2 query and host report 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)             */
  
  /*
   * IGMP v3 query format.
   */
  struct igmpv3 {
  	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)             */
  	u_char		igmp_misc;	/* reserved/suppress/robustness    */
  	u_char		igmp_qqi;	/* querier's query interval        */
  	u_short		igmp_numsrc;	/* number of sources               */
  	/*struct in_addr	igmp_sources[1];*/ /* source addresses */
  };
  #define IGMP_V3_QUERY_MINLEN		12
  #define IGMP_EXP(x)			(((x) >> 4) & 0x07)
  #define IGMP_MANT(x)			((x) & 0x0f)
  #define IGMP_QRESV(x)			(((x) >> 4) & 0x0f)
  #define IGMP_SFLAG(x)			(((x) >> 3) & 0x01)
  #define IGMP_QRV(x)			((x) & 0x07)
  
  struct igmp_grouprec {
  	u_char		ig_type;	/* record type */
  	u_char		ig_datalen;	/* length of auxiliary data */
  	u_short		ig_numsrc;	/* number of sources */
  	struct in_addr	ig_group;	/* group address being reported */
  	/*struct in_addr	ig_sources[1];*/ /* source addresses */
  };
  #define IGMP_GRPREC_HDRLEN		8
  
  /*
   * IGMPv3 host membership report header.
   */
  struct igmp_report {
  	u_char		ir_type;	/* IGMP_v3_HOST_MEMBERSHIP_REPORT */
  	u_char		ir_rsv1;	/* must be zero */
  	u_short		ir_cksum;	/* checksum */
  	u_short		ir_rsv2;	/* must be zero */
  	u_short		ir_numgrps;	/* number of group records */
  	/*struct	igmp_grouprec ir_groups[1];*/	/* group records */
  };
  #define IGMP_V3_REPORT_MINLEN		8
  #define IGMP_V3_REPORT_MAXRECS		65535
  
  /*
   * Message types, including version number.
   */
  #define IGMP_HOST_MEMBERSHIP_QUERY	0x11	/* membership query         */
  #define IGMP_v1_HOST_MEMBERSHIP_REPORT	0x12	/* Ver. 1 membership report */
  #define IGMP_DVMRP			0x13	/* DVMRP routing message    */
  #define IGMP_PIM			0x14	/* PIMv1 message (historic) */
  #define IGMP_v2_HOST_MEMBERSHIP_REPORT	0x16	/* Ver. 2 membership report */
  #define IGMP_HOST_LEAVE_MESSAGE		0x17	/* Leave-group message     */
  #define IGMP_MTRACE_REPLY		0x1e	/* mtrace(8) reply */
  #define IGMP_MTRACE_QUERY		0x1f	/* mtrace(8) probe */
  #define IGMP_v3_HOST_MEMBERSHIP_REPORT	0x22	/* Ver. 3 membership report */
  
  /*
   * IGMPv3 report modes.
   */
  #define IGMP_DO_NOTHING			0	/* don't send a record */
  #define IGMP_MODE_IS_INCLUDE		1	/* MODE_IN */
  #define IGMP_MODE_IS_EXCLUDE		2	/* MODE_EX */
  #define IGMP_CHANGE_TO_INCLUDE_MODE	3	/* TO_IN */
  #define IGMP_CHANGE_TO_EXCLUDE_MODE	4	/* TO_EX */
  #define IGMP_ALLOW_NEW_SOURCES		5	/* ALLOW_NEW */
  #define IGMP_BLOCK_OLD_SOURCES		6	/* BLOCK_OLD */
  
  /*
   * IGMPv3 query types.
   */
  #define IGMP_V3_GENERAL_QUERY		1
  #define IGMP_V3_GROUP_QUERY		2
  #define IGMP_V3_GROUP_SOURCE_QUERY	3
  
  /*
   * Maximum report interval for IGMP v1/v2 host membership reports [RFC 1112]
   */
  #define IGMP_V1V2_MAX_RI		10
  #define IGMP_MAX_HOST_REPORT_DELAY	IGMP_V1V2_MAX_RI
  
  /*
   * IGMP_TIMER_SCALE denotes that the igmp code field specifies
   * time in tenths of a second.
   */
  #define IGMP_TIMER_SCALE		10
  
  #endif /* _NETINET_IGMP_H_ */
  