include/uapi/linux/igmp.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  *      Linux NET3:     Internet Group Management Protocol  [IGMP]
   4  *
   5  *      Authors:
   6  *              Alan Cox <alan@lxorguk.ukuu.org.uk>
   7  *
   8  *      Extended to talk the BSD extended IGMP protocol of mrouted 3.6
   9  *
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 #ifndef _UAPI_LINUX_IGMP_H
  18 #define _UAPI_LINUX_IGMP_H
  19
  20 #include <linux/types.h>
  21 #include <asm/byteorder.h>
  22
  23 /*
  24  *      IGMP protocol structures
  25  */
  26
  27 /*
  28  *      Header in on cable format
  29  */
  30
  31 struct igmphdr {
  32         __u8 type;
  33         __u8 code;              /* For newer IGMP */
  34         __sum16 csum;
  35         __be32 group;
  36 };
  37
  38 /* V3 group record types [grec_type] */
  39 #define IGMPV3_MODE_IS_INCLUDE          1
  40 #define IGMPV3_MODE_IS_EXCLUDE          2
  41 #define IGMPV3_CHANGE_TO_INCLUDE        3
  42 #define IGMPV3_CHANGE_TO_EXCLUDE        4
  43 #define IGMPV3_ALLOW_NEW_SOURCES        5
  44 #define IGMPV3_BLOCK_OLD_SOURCES        6
  45
  46 struct igmpv3_grec {
  47         __u8    grec_type;
  48         __u8    grec_auxwords;
  49         __be16  grec_nsrcs;
  50         __be32  grec_mca;
  51         __be32  grec_src[0];
  52 };
  53
  54 struct igmpv3_report {
  55         __u8 type;
  56         __u8 resv1;
  57         __sum16 csum;
  58         __be16 resv2;
  59         __be16 ngrec;
  60         struct igmpv3_grec grec[0];
  61 };
  62
  63 struct igmpv3_query {
  64         __u8 type;
  65         __u8 code;
  66         __sum16 csum;
  67         __be32 group;
  68 #if defined(__LITTLE_ENDIAN_BITFIELD)
  69         __u8 qrv:3,
  70              suppress:1,
  71              resv:4;
  72 #elif defined(__BIG_ENDIAN_BITFIELD)
  73         __u8 resv:4,
  74              suppress:1,
  75              qrv:3;
  76 #else
  77 #error "Please fix <asm/byteorder.h>"
  78 #endif
  79         __u8 qqic;
  80         __be16 nsrcs;
  81         __be32 srcs[0];
  82 };
  83
  84 #define IGMP_HOST_MEMBERSHIP_QUERY      0x11    /* From RFC1112 */
  85 #define IGMP_HOST_MEMBERSHIP_REPORT     0x12    /* Ditto */
  86 #define IGMP_DVMRP                      0x13    /* DVMRP routing */
  87 #define IGMP_PIM                        0x14    /* PIM routing */
  88 #define IGMP_TRACE                      0x15
  89 #define IGMPV2_HOST_MEMBERSHIP_REPORT   0x16    /* V2 version of 0x12 */
  90 #define IGMP_HOST_LEAVE_MESSAGE         0x17
  91 #define IGMPV3_HOST_MEMBERSHIP_REPORT   0x22    /* V3 version of 0x12 */
  92
  93 #define IGMP_MTRACE_RESP                0x1e
  94 #define IGMP_MTRACE                     0x1f
  95
  96 #define IGMP_MRDISC_ADV                 0x30    /* From RFC4286 */
  97
  98 /*
  99  *      Use the BSD names for these for compatibility
 100  */
 101
 102 #define IGMP_DELAYING_MEMBER            0x01
 103 #define IGMP_IDLE_MEMBER                0x02
 104 #define IGMP_LAZY_MEMBER                0x03
 105 #define IGMP_SLEEPING_MEMBER            0x04
 106 #define IGMP_AWAKENING_MEMBER           0x05
 107
 108 #define IGMP_MINLEN                     8
 109
 110 #define IGMP_MAX_HOST_REPORT_DELAY      10      /* max delay for response to */
 111                                                 /* query (in seconds)   */
 112
 113 #define IGMP_TIMER_SCALE                10      /* denotes that the igmphdr->timer field */
 114                                                 /* specifies time in 10th of seconds     */
 115
 116 #define IGMP_AGE_THRESHOLD              400     /* If this host don't hear any IGMP V1  */
 117                                                 /* message in this period of time,      */
 118                                                 /* revert to IGMP v2 router.            */
 119
 120 #define IGMP_ALL_HOSTS          htonl(0xE0000001L)
 121 #define IGMP_ALL_ROUTER         htonl(0xE0000002L)
 122 #define IGMPV3_ALL_MCR          htonl(0xE0000016L)
 123 #define IGMP_LOCAL_GROUP        htonl(0xE0000000L)
 124 #define IGMP_LOCAL_GROUP_MASK   htonl(0xFFFFFF00L)
 125
 126 /*
 127  * struct for keeping the multicast list in
 128  */
 129
 130 #endif /* _UAPI_LINUX_IGMP_H */