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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1988 Stephen Deering.
    5  * Copyright (c) 1992, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * Stephen Deering of Stanford University.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)igmp.h      8.1 (Berkeley) 6/10/93
   36  * $FreeBSD: releng/12.0/sys/netinet/igmp.h 326023 2017-11-20 19:43:44Z pfg $
   37  */
   38 
   39 #ifndef _NETINET_IGMP_H_
   40 #define _NETINET_IGMP_H_
   41 
   42 /*
   43  * Internet Group Management Protocol (IGMP) definitions.
   44  *
   45  * Written by Steve Deering, Stanford, May 1988.
   46  *
   47  * MULTICAST Revision: 3.5.1.2
   48  */
   49 
   50 /* Minimum length of any IGMP protocol message. */
   51 #define IGMP_MINLEN                     8
   52 
   53 /*
   54  * IGMPv1/v2 query and host report format.
   55  */
   56 struct igmp {
   57         u_char          igmp_type;      /* version & type of IGMP message  */
   58         u_char          igmp_code;      /* subtype for routing msgs        */
   59         u_short         igmp_cksum;     /* IP-style checksum               */
   60         struct in_addr  igmp_group;     /* group address being reported    */
   61 };                                      /*  (zero for queries)             */
   62 
   63 /*
   64  * IGMP v3 query format.
   65  */
   66 struct igmpv3 {
   67         u_char          igmp_type;      /* version & type of IGMP message  */
   68         u_char          igmp_code;      /* subtype for routing msgs        */
   69         u_short         igmp_cksum;     /* IP-style checksum               */
   70         struct in_addr  igmp_group;     /* group address being reported    */
   71                                         /*  (zero for queries)             */
   72         u_char          igmp_misc;      /* reserved/suppress/robustness    */
   73         u_char          igmp_qqi;       /* querier's query interval        */
   74         u_short         igmp_numsrc;    /* number of sources               */
   75         /*struct in_addr        igmp_sources[1];*/ /* source addresses */
   76 };
   77 #define IGMP_V3_QUERY_MINLEN            12
   78 #define IGMP_EXP(x)                     (((x) >> 4) & 0x07)
   79 #define IGMP_MANT(x)                    ((x) & 0x0f)
   80 #define IGMP_QRESV(x)                   (((x) >> 4) & 0x0f)
   81 #define IGMP_SFLAG(x)                   (((x) >> 3) & 0x01)
   82 #define IGMP_QRV(x)                     ((x) & 0x07)
   83 
   84 struct igmp_grouprec {
   85         u_char          ig_type;        /* record type */
   86         u_char          ig_datalen;     /* length of auxiliary data */
   87         u_short         ig_numsrc;      /* number of sources */
   88         struct in_addr  ig_group;       /* group address being reported */
   89         /*struct in_addr        ig_sources[1];*/ /* source addresses */
   90 };
   91 #define IGMP_GRPREC_HDRLEN              8
   92 
   93 /*
   94  * IGMPv3 host membership report header.
   95  */
   96 struct igmp_report {
   97         u_char          ir_type;        /* IGMP_v3_HOST_MEMBERSHIP_REPORT */
   98         u_char          ir_rsv1;        /* must be zero */
   99         u_short         ir_cksum;       /* checksum */
  100         u_short         ir_rsv2;        /* must be zero */
  101         u_short         ir_numgrps;     /* number of group records */
  102         /*struct        igmp_grouprec ir_groups[1];*/   /* group records */
  103 };
  104 #define IGMP_V3_REPORT_MINLEN           8
  105 #define IGMP_V3_REPORT_MAXRECS          65535
  106 
  107 /*
  108  * Message types, including version number.
  109  */
  110 #define IGMP_HOST_MEMBERSHIP_QUERY      0x11    /* membership query         */
  111 #define IGMP_v1_HOST_MEMBERSHIP_REPORT  0x12    /* Ver. 1 membership report */
  112 #define IGMP_DVMRP                      0x13    /* DVMRP routing message    */
  113 #define IGMP_PIM                        0x14    /* PIMv1 message (historic) */
  114 #define IGMP_v2_HOST_MEMBERSHIP_REPORT  0x16    /* Ver. 2 membership report */
  115 #define IGMP_HOST_LEAVE_MESSAGE         0x17    /* Leave-group message     */
  116 #define IGMP_MTRACE_REPLY               0x1e    /* mtrace(8) reply */
  117 #define IGMP_MTRACE_QUERY               0x1f    /* mtrace(8) probe */
  118 #define IGMP_v3_HOST_MEMBERSHIP_REPORT  0x22    /* Ver. 3 membership report */
  119 
  120 /*
  121  * IGMPv3 report modes.
  122  */
  123 #define IGMP_DO_NOTHING                 0       /* don't send a record */
  124 #define IGMP_MODE_IS_INCLUDE            1       /* MODE_IN */
  125 #define IGMP_MODE_IS_EXCLUDE            2       /* MODE_EX */
  126 #define IGMP_CHANGE_TO_INCLUDE_MODE     3       /* TO_IN */
  127 #define IGMP_CHANGE_TO_EXCLUDE_MODE     4       /* TO_EX */
  128 #define IGMP_ALLOW_NEW_SOURCES          5       /* ALLOW_NEW */
  129 #define IGMP_BLOCK_OLD_SOURCES          6       /* BLOCK_OLD */
  130 
  131 /*
  132  * IGMPv3 query types.
  133  */
  134 #define IGMP_V3_GENERAL_QUERY           1
  135 #define IGMP_V3_GROUP_QUERY             2
  136 #define IGMP_V3_GROUP_SOURCE_QUERY      3
  137 
  138 /*
  139  * Maximum report interval for IGMP v1/v2 host membership reports [RFC 1112]
  140  */
  141 #define IGMP_V1V2_MAX_RI                10
  142 #define IGMP_MAX_HOST_REPORT_DELAY      IGMP_V1V2_MAX_RI
  143 
  144 /*
  145  * IGMP_TIMER_SCALE denotes that the igmp code field specifies
  146  * time in tenths of a second.
  147  */
  148 #define IGMP_TIMER_SCALE                10
  149 
  150 #endif /* _NETINET_IGMP_H_ */

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