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 36 #ifndef _NETINET_IGMP_H_ 37 #define _NETINET_IGMP_H_ 38 39 /* 40 * Internet Group Management Protocol (IGMP) definitions. 41 * 42 * Written by Steve Deering, Stanford, May 1988. 43 * 44 * MULTICAST Revision: 3.5.1.2 45 */ 46 47 /* Minimum length of any IGMP protocol message. */ 48 #define IGMP_MINLEN 8 49 50 /* 51 * IGMPv1/v2 query and host report format. 52 */ 53 struct igmp { 54 u_char igmp_type; /* version & type of IGMP message */ 55 u_char igmp_code; /* subtype for routing msgs */ 56 u_short igmp_cksum; /* IP-style checksum */ 57 struct in_addr igmp_group; /* group address being reported */ 58 }; /* (zero for queries) */ 59 60 /* 61 * IGMP v3 query format. 62 */ 63 struct igmpv3 { 64 u_char igmp_type; /* version & type of IGMP message */ 65 u_char igmp_code; /* subtype for routing msgs */ 66 u_short igmp_cksum; /* IP-style checksum */ 67 struct in_addr igmp_group; /* group address being reported */ 68 /* (zero for queries) */ 69 u_char igmp_misc; /* reserved/suppress/robustness */ 70 u_char igmp_qqi; /* querier's query interval */ 71 u_short igmp_numsrc; /* number of sources */ 72 /*struct in_addr igmp_sources[1];*/ /* source addresses */ 73 }; 74 #define IGMP_V3_QUERY_MINLEN 12 75 #define IGMP_EXP(x) (((x) >> 4) & 0x07) 76 #define IGMP_MANT(x) ((x) & 0x0f) 77 #define IGMP_QRESV(x) (((x) >> 4) & 0x0f) 78 #define IGMP_SFLAG(x) (((x) >> 3) & 0x01) 79 #define IGMP_QRV(x) ((x) & 0x07) 80 81 struct igmp_grouprec { 82 u_char ig_type; /* record type */ 83 u_char ig_datalen; /* length of auxiliary data */ 84 u_short ig_numsrc; /* number of sources */ 85 struct in_addr ig_group; /* group address being reported */ 86 /*struct in_addr ig_sources[1];*/ /* source addresses */ 87 }; 88 #define IGMP_GRPREC_HDRLEN 8 89 90 /* 91 * IGMPv3 host membership report header. 92 */ 93 struct igmp_report { 94 u_char ir_type; /* IGMP_v3_HOST_MEMBERSHIP_REPORT */ 95 u_char ir_rsv1; /* must be zero */ 96 u_short ir_cksum; /* checksum */ 97 u_short ir_rsv2; /* must be zero */ 98 u_short ir_numgrps; /* number of group records */ 99 /*struct igmp_grouprec ir_groups[1];*/ /* group records */ 100 }; 101 #define IGMP_V3_REPORT_MINLEN 8 102 #define IGMP_V3_REPORT_MAXRECS 65535 103 104 /* 105 * Message types, including version number. 106 */ 107 #define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* membership query */ 108 #define IGMP_v1_HOST_MEMBERSHIP_REPORT 0x12 /* Ver. 1 membership report */ 109 #define IGMP_DVMRP 0x13 /* DVMRP routing message */ 110 #define IGMP_PIM 0x14 /* PIMv1 message (historic) */ 111 #define IGMP_v2_HOST_MEMBERSHIP_REPORT 0x16 /* Ver. 2 membership report */ 112 #define IGMP_HOST_LEAVE_MESSAGE 0x17 /* Leave-group message */ 113 #define IGMP_MTRACE_REPLY 0x1e /* mtrace(8) reply */ 114 #define IGMP_MTRACE_QUERY 0x1f /* mtrace(8) probe */ 115 #define IGMP_v3_HOST_MEMBERSHIP_REPORT 0x22 /* Ver. 3 membership report */ 116 117 /* 118 * IGMPv3 report modes. 119 */ 120 #define IGMP_DO_NOTHING 0 /* don't send a record */ 121 #define IGMP_MODE_IS_INCLUDE 1 /* MODE_IN */ 122 #define IGMP_MODE_IS_EXCLUDE 2 /* MODE_EX */ 123 #define IGMP_CHANGE_TO_INCLUDE_MODE 3 /* TO_IN */ 124 #define IGMP_CHANGE_TO_EXCLUDE_MODE 4 /* TO_EX */ 125 #define IGMP_ALLOW_NEW_SOURCES 5 /* ALLOW_NEW */ 126 #define IGMP_BLOCK_OLD_SOURCES 6 /* BLOCK_OLD */ 127 128 /* 129 * IGMPv3 query types. 130 */ 131 #define IGMP_V3_GENERAL_QUERY 1 132 #define IGMP_V3_GROUP_QUERY 2 133 #define IGMP_V3_GROUP_SOURCE_QUERY 3 134 135 /* 136 * Maximum report interval for IGMP v1/v2 host membership reports [RFC 1112] 137 */ 138 #define IGMP_V1V2_MAX_RI 10 139 #define IGMP_MAX_HOST_REPORT_DELAY IGMP_V1V2_MAX_RI 140 141 /* 142 * IGMP_TIMER_SCALE denotes that the igmp code field specifies 143 * time in tenths of a second. 144 */ 145 #define IGMP_TIMER_SCALE 10 146 147 #endif /* _NETINET_IGMP_H_ */ 148