LXR linux/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
  31struct 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
  46struct 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
  54struct 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
  63struct 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
  97/*
  98 *      Use the BSD names for these for compatibility
  99 */
 100
 101#define IGMP_DELAYING_MEMBER            0x01
 102#define IGMP_IDLE_MEMBER                0x02
 103#define IGMP_LAZY_MEMBER                0x03
 104#define IGMP_SLEEPING_MEMBER            0x04
 105#define IGMP_AWAKENING_MEMBER           0x05
 106
 107#define IGMP_MINLEN                     8
 108
 109#define IGMP_MAX_HOST_REPORT_DELAY      10      /* max delay for response to */
 110                                                /* query (in seconds)   */
 111
 112#define IGMP_TIMER_SCALE                10      /* denotes that the igmphdr->timer field */
 113                                                /* specifies time in 10th of seconds     */
 114
 115#define IGMP_AGE_THRESHOLD              400     /* If this host don't hear any IGMP V1  */
 116                                                /* message in this period of time,      */
 117                                                /* revert to IGMP v2 router.            */
 118
 119#define IGMP_ALL_HOSTS          htonl(0xE0000001L)
 120#define IGMP_ALL_ROUTER         htonl(0xE0000002L)
 121#define IGMPV3_ALL_MCR          htonl(0xE0000016L)
 122#define IGMP_LOCAL_GROUP        htonl(0xE0000000L)
 123#define IGMP_LOCAL_GROUP_MASK   htonl(0xFFFFFF00L)
 124
 125/*
 126 * struct for keeping the multicast list in
 127 */
 128
 129#endif /* _UAPI_LINUX_IGMP_H */
 130