| 1 | /* |
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| 2 | * Linux NET3: Internet Group Management Protocol [IGMP] |
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| 3 | * |
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| 4 | * Authors: |
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| 5 | * Alan Cox <Alan.Cox@linux.org> |
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| 6 | * |
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| 7 | * Extended to talk the BSD extended IGMP protocol of mrouted 3.6 |
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| 8 | * |
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| 9 | * |
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| 10 | * This program is free software; you can redistribute it and/or |
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| 11 | * modify it under the terms of the GNU General Public License |
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| 12 | * as published by the Free Software Foundation; either version |
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| 13 | * 2 of the License, or (at your option) any later version. |
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| 14 | */ |
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| 15 | |
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| 16 | #ifndef _LINUX_IGMP_H |
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| 17 | #define _LINUX_IGMP_H |
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| 18 | |
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| 19 | #include <asm/types.h> |
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| 20 | |
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| 21 | #include <endian.h> |
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| 22 | #include <byteswap.h> |
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| 23 | |
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| 24 | /* |
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| 25 | * IGMP protocol structures |
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| 26 | */ |
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| 27 | |
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| 28 | /* |
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| 29 | * Header in on cable format |
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| 30 | */ |
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| 31 | |
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| 32 | struct igmphdr |
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| 33 | { |
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| 34 | __u8 type; |
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| 35 | __u8 code; /* For newer IGMP */ |
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| 36 | __u16 csum; |
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| 37 | __u32 group; |
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| 38 | }; |
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| 39 | |
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| 40 | /* V3 group record types [grec_type] */ |
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| 41 | #define IGMPV3_MODE_IS_INCLUDE 1 |
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| 42 | #define IGMPV3_MODE_IS_EXCLUDE 2 |
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| 43 | #define IGMPV3_CHANGE_TO_INCLUDE 3 |
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| 44 | #define IGMPV3_CHANGE_TO_EXCLUDE 4 |
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| 45 | #define IGMPV3_ALLOW_NEW_SOURCES 5 |
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| 46 | #define IGMPV3_BLOCK_OLD_SOURCES 6 |
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| 47 | |
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| 48 | struct igmpv3_grec { |
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| 49 | __u8 grec_type; |
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| 50 | __u8 grec_auxwords; |
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| 51 | __u16 grec_nsrcs; |
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| 52 | __u32 grec_mca; |
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| 53 | __u32 grec_src[0]; |
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| 54 | }; |
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| 55 | |
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| 56 | struct igmpv3_report { |
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| 57 | __u8 type; |
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| 58 | __u8 resv1; |
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| 59 | __u16 csum; |
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| 60 | __u16 resv2; |
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| 61 | __u16 ngrec; |
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| 62 | struct igmpv3_grec grec[0]; |
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| 63 | }; |
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| 64 | |
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| 65 | struct igmpv3_query { |
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| 66 | __u8 type; |
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| 67 | __u8 code; |
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| 68 | __u16 csum; |
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| 69 | __u32 group; |
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| 70 | #if defined(__LITTLE_ENDIAN) |
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| 71 | __u8 qrv:3, |
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| 72 | suppress:1, |
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| 73 | resv:4; |
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| 74 | #elif defined(__BIG_ENDIAN) |
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| 75 | __u8 resv:4, |
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| 76 | suppress:1, |
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| 77 | qrv:3; |
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| 78 | #else |
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| 79 | #error "Endian problem - this didn't happen" |
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| 80 | #endif |
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| 81 | __u8 qqic; |
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| 82 | __u16 nsrcs; |
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| 83 | __u32 srcs[0]; |
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| 84 | }; |
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| 85 | |
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| 86 | #define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* From RFC1112 */ |
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| 87 | #define IGMP_HOST_MEMBERSHIP_REPORT 0x12 /* Ditto */ |
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| 88 | #define IGMP_DVMRP 0x13 /* DVMRP routing */ |
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| 89 | #define IGMP_PIM 0x14 /* PIM routing */ |
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| 90 | #define IGMP_TRACE 0x15 |
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| 91 | #define IGMPV2_HOST_MEMBERSHIP_REPORT 0x16 /* V2 version of 0x11 */ |
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| 92 | #define IGMP_HOST_LEAVE_MESSAGE 0x17 |
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| 93 | #define IGMPV3_HOST_MEMBERSHIP_REPORT 0x22 /* V3 version of 0x11 */ |
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| 94 | |
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| 95 | #define IGMP_MTRACE_RESP 0x1e |
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| 96 | #define IGMP_MTRACE 0x1f |
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| 97 | |
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| 98 | |
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| 99 | /* |
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| 100 | * Use the BSD names for these for compatibility |
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| 101 | */ |
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| 102 | |
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| 103 | #define IGMP_DELAYING_MEMBER 0x01 |
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| 104 | #define IGMP_IDLE_MEMBER 0x02 |
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| 105 | #define IGMP_LAZY_MEMBER 0x03 |
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| 106 | #define IGMP_SLEEPING_MEMBER 0x04 |
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| 107 | #define IGMP_AWAKENING_MEMBER 0x05 |
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| 108 | |
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| 109 | #define IGMP_MINLEN 8 |
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| 110 | |
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| 111 | #define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */ |
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| 112 | /* query (in seconds) */ |
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| 113 | |
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| 114 | #define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */ |
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| 115 | /* specifies time in 10th of seconds */ |
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| 116 | |
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| 117 | #define IGMP_AGE_THRESHOLD 400 /* If this host don't hear any IGMP V1 */ |
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| 118 | /* message in this period of time, */ |
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| 119 | /* revert to IGMP v2 router. */ |
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| 120 | |
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| 121 | #define IGMP_ALL_HOSTS htonl(0xE0000001L) |
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| 122 | #define IGMP_ALL_ROUTER htonl(0xE0000002L) |
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| 123 | #define IGMPV3_ALL_MCR htonl(0xE0000016L) |
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| 124 | #define IGMP_LOCAL_GROUP htonl(0xE0000000L) |
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| 125 | #define IGMP_LOCAL_GROUP_MASK htonl(0xFFFFFF00L) |
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| 126 | |
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| 127 | #endif |
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