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 
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