1: /*
2: * Internet Group Management Protocol (IGMP) definitions.
3: *
4: * Written by Steve Deering, Stanford, May 1988.
5: *
6: * MULTICAST $Revision: 1.1 $
7: */
8:
9: /*
10: * IGMP packet format.
11: */
12: struct igmp {
13: u_char igmp_type; /* version & type of IGMP message */
14: u_char igmp_code; /* code for routing sub-msgs */
15: u_short igmp_cksum; /* IP-style checksum */
16: struct in_addr igmp_group; /* group address being reported */
17: }; /* (zero for queries) */
18:
19: #define IGMP_MINLEN 8
20:
21: /*
22: * Message types, including version number.
23: */
24: #define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* Host membership query */
25: #define IGMP_HOST_MEMBERSHIP_REPORT 0x12 /* Old membership report */
26: #define IGMP_DVMRP 0x13 /* DVMRP routing message */
27: #define IGMP_PIM 0x14 /* PIM routing message */
28:
29: #define IGMP_HOST_NEW_MEMBERSHIP_REPORT 0x16 /* New membership report */
30:
31: #define IGMP_HOST_LEAVE_MESSAGE 0x17 /* Leave-group message */
32:
33: #define IGMP_MTRACE_RESP 0x1e /* traceroute resp. (to sender) */
34: #define IGMP_MTRACE 0x1f /* mcast traceroute messages */
35:
36: #define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */
37: /* query (in seconds) */
38:
39:
40: #define IGMP_TIMER_SCALE 10 /* denotes that the igmp->timer filed */
41: /* specifies time in 10th of seconds */
42:
43: /*
44: * States for the IGMPv2 state table
45: */
46: #define IGMP_DELAYING_MEMBER 1
47: #define IGMP_IDLE_MEMBER 2
48: #define IGMP_LAZY_MEMBER 3
49: #define IGMP_SLEEPING_MEMBER 4
50: #define IGMP_AWAKENING_MEMBER 5
51:
52: /*
53: * We must remember whether the querier is an old or a new router.
54: */
55: #define IGMP_OLD_ROUTER 0
56: #define IGMP_NEW_ROUTER 1
57:
58: /*
59: * Revert to new router if we haven't heard from an old router in
60: * this amount of time.
61: */
62: #define IGMP_AGE_THRESHOLD 540
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