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 _LINUX_IGMP_H
18#define _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[];
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[];
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[];
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 /* _LINUX_IGMP_H */