1 /*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * Authors:
5 * Alan Cox <Alan.Cox@linux.org>
6 *
7 * Extended to talk the BSD extended IGMP protocol of mrouted 3.6
8 *
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 #ifndef _LINUX_IGMP_H
17 #define _LINUX_IGMP_H
18
19 /*
20 * IGMP protocol structures
21 */
22
23 /*
24 * Header in on cable format
25 */
26
27 struct igmphdr
28 {
29 __u8 type;
30 __u8 code; /* For newer IGMP */
31 __u16 csum;
32 __u32 group;
33 };
34
35 #define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* From RFC1112 */
36 #define IGMP_HOST_MEMBERSHIP_REPORT 0x12 /* Ditto */
37 #define IGMP_DVMRP 0x13 /* DVMRP routing */
38 #define IGMP_PIM 0x14 /* PIM routing */
39 #define IGMP_TRACE 0x15
40 #define IGMP_HOST_NEW_MEMBERSHIP_REPORT 0x16 /* New version of 0x11 */
41 #define IGMP_HOST_LEAVE_MESSAGE 0x17
42
43 #define IGMP_MTRACE_RESP 0x1e
44 #define IGMP_MTRACE 0x1f
45
46
47 /*
48 * Use the BSD names for these for compatibility
49 */
50
51 #define IGMP_DELAYING_MEMBER 0x01
52 #define IGMP_IDLE_MEMBER 0x02
53 #define IGMP_LAZY_MEMBER 0x03
54 #define IGMP_SLEEPING_MEMBER 0x04
55 #define IGMP_AWAKENING_MEMBER 0x05
56
57 #define IGMP_MINLEN 8
58
59 #define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */
60 /* query (in seconds) */
61
62 #define IGMP_TIMER_SCALE 10 /* denotes that the igmphdr->timer field */
63 /* specifies time in 10th of seconds */
64
65 #define IGMP_AGE_THRESHOLD 400 /* If this host don't hear any IGMP V1 */
66 /* message in this period of time, */
67 /* revert to IGMP v2 router. */
68
69 #define IGMP_ALL_HOSTS htonl(0xE0000001L)
70 #define IGMP_ALL_ROUTER htonl(0xE0000002L)
71 #define IGMP_LOCAL_GROUP htonl(0xE0000000L)
72 #define IGMP_LOCAL_GROUP_MASK htonl(0xFFFFFF00L)
73
74 /*
75 * struct for keeping the multicast list in
76 */
77
78 #ifdef __KERNEL__
79
80 /* ip_mc_socklist is real list now. Speed is not argument;
81 this list never used in fast path code
82 */
83
84 struct ip_mc_socklist
85 {
86 struct ip_mc_socklist *next;
87 int count;
88 struct ip_mreqn multi;
89 };
90
91 struct ip_mc_list
92 {
93 struct in_device *interface;
94 unsigned long multiaddr;
95 struct ip_mc_list *next;
96 struct timer_list timer;
97 int users;
98 atomic_t refcnt;
99 spinlock_t lock;
100 char tm_running;
101 char reporter;
102 char unsolicit_count;
103 char loaded;
104 };
105
106 extern int ip_check_mc(struct in_device *dev, u32 mc_addr);
107 extern int igmp_rcv(struct sk_buff *, unsigned short);
108 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
109 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
110 extern void ip_mc_drop_socket(struct sock *sk);
111 extern void ip_mr_init(void);
112 extern void ip_mc_init_dev(struct in_device *);
113 extern void ip_mc_destroy_dev(struct in_device *);
114 extern void ip_mc_up(struct in_device *);
115 extern void ip_mc_down(struct in_device *);
116 extern int ip_mc_dec_group(struct in_device *in_dev, u32 addr);
117 extern void ip_mc_inc_group(struct in_device *in_dev, u32 addr);
118 #endif
119 #endif
120
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