The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/igmp.h

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    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  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)igmp.h      8.1 (Berkeley) 6/10/93
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef _NETINET_IGMP_H_
   38 #define _NETINET_IGMP_H_
   39 
   40 /*
   41  * Internet Group Management Protocol (IGMP) definitions.
   42  *
   43  * Written by Steve Deering, Stanford, May 1988.
   44  *
   45  * MULTICAST Revision: 3.5.1.2
   46  */
   47 
   48 /*
   49  * IGMP packet format.
   50  */
   51 struct igmp {
   52         u_char          igmp_type;      /* version & type of IGMP message  */
   53         u_char          igmp_code;      /* subtype for routing msgs        */
   54         u_short         igmp_cksum;     /* IP-style checksum               */
   55         struct in_addr  igmp_group;     /* group address being reported    */
   56 };                                      /*  (zero for queries)             */
   57 
   58 struct igmpv3 {
   59         u_char          igmp_type;      /* version & type of IGMP message  */
   60         u_char          igmp_code;      /* subtype for routing msgs        */
   61         u_short         igmp_cksum;     /* IP-style checksum               */
   62         struct in_addr  igmp_group;     /* group address being reported    */
   63                                         /*  (zero for queries)             */
   64         u_char          igmp_misc;      /* reserved/suppress/robustness    */
   65         u_char          igmp_qqi;       /* querier's query interval        */
   66         u_short         igmp_numsrc;    /* number of sources               */
   67         /*struct in_addr        igmp_sources[1];*/ /* source addresses */
   68 };
   69 
   70 struct igmp_grouprec {
   71         u_char          ig_type;        /* record type */
   72         u_char          ig_datalen;     /* length of auxiliary data */
   73         u_short         ig_numsrc;      /* number of sources */
   74         struct in_addr  ig_group;       /* group address being reported */
   75         /*struct in_addr        ig_sources[1];*/ /* source addresses */
   76 };
   77 
   78 struct igmp_report {
   79         u_char          ir_type;        /* record type */
   80         u_char          ir_rsv1;        /* reserved */
   81         u_short         ir_cksum;       /* checksum */
   82         u_short         ir_rsv2;        /* reserved */
   83         u_short         ir_numgrps;     /* number of group records */
   84         struct          igmp_grouprec ir_groups[1];     /* group records */
   85 };
   86 
   87 #define IGMP_MINLEN                     8
   88 #define IGMP_HDRLEN                     8
   89 #define IGMP_GRPREC_HDRLEN              8
   90 #define IGMP_PREPEND                    0
   91 
   92 #if 0
   93 #define IGMP_QRV(pigmp)                 ((pigmp)->igmp_misc & (0x07)) /* XXX */
   94 #define IGMP_MAXSOURCES(len)            (((len) - 12) >> 2) /* XXX */
   95 #endif
   96 
   97 /*
   98  * Message types, including version number.
   99  */
  100 #define IGMP_MEMBERSHIP_QUERY           0x11    /* membership query         */
  101 #define IGMP_V1_MEMBERSHIP_REPORT       0x12    /* Ver. 1 membership report */
  102 #define IGMP_V2_MEMBERSHIP_REPORT       0x16    /* Ver. 2 membership report */
  103 #define IGMP_V2_LEAVE_GROUP             0x17    /* Leave-group message      */
  104 
  105 #define IGMP_DVMRP                      0x13    /* DVMRP routing message    */
  106 #define IGMP_PIM                        0x14    /* PIM routing message      */
  107 
  108 #define IGMP_MTRACE_RESP                0x1e  /* traceroute resp.(to sender)*/
  109 #define IGMP_MTRACE                     0x1f  /* mcast traceroute messages  */
  110 
  111 #define IGMP_V3_MEMBERSHIP_REPORT       0x22    /* Ver. 3 membership report */
  112 
  113 #define IGMP_MAX_HOST_REPORT_DELAY   10    /* max delay for response to     */
  114                                            /*  query (in seconds) according */
  115                                            /*  to RFC1112                   */
  116 
  117 
  118 #define IGMP_TIMER_SCALE     10         /* denotes that the igmp code field */
  119                                         /* specifies time in 10th of seconds*/
  120 
  121 /*
  122  * The following four defininitions are for backwards compatibility.
  123  * They should be removed as soon as all applications are updated to
  124  * use the new constant names.
  125  */
  126 #define IGMP_HOST_MEMBERSHIP_QUERY      IGMP_MEMBERSHIP_QUERY
  127 #define IGMP_HOST_MEMBERSHIP_REPORT     IGMP_V1_MEMBERSHIP_REPORT
  128 #define IGMP_HOST_NEW_MEMBERSHIP_REPORT IGMP_V2_MEMBERSHIP_REPORT
  129 #define IGMP_HOST_LEAVE_MESSAGE         IGMP_V2_LEAVE_GROUP
  130 
  131 #endif /* _NETINET_IGMP_H_ */

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