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1 | /* |
2 | * Copyright (c) 1988 Stephen Deering. | |
3 | * Copyright (c) 1992, 1993 | |
4 | * The Regents of the University of California. All rights reserved. | |
5 | * | |
6 | * This code is derived from software contributed to Berkeley by | |
7 | * Stephen Deering of Stanford University. | |
8 | * | |
c0567266 KB |
9 | * Redistribution and use in source and binary forms, with or without |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * 3. All advertising materials mentioning features or use of this software | |
18 | * must display the following acknowledgement: | |
19 | * This product includes software developed by the University of | |
20 | * California, Berkeley and its contributors. | |
21 | * 4. Neither the name of the University nor the names of its contributors | |
22 | * may be used to endorse or promote products derived from this software | |
23 | * without specific prior written permission. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
35 | * SUCH DAMAGE. | |
ad787160 C |
36 | * |
37 | * @(#)igmp.h 8.1 (Berkeley) 6/10/93 | |
38 | */ | |
39 | ||
40 | /* Internet Group Management Protocol (IGMP) definitions. */ | |
41 | ||
42 | /* | |
43 | * IGMP packet format. | |
44 | */ | |
45 | struct igmp { | |
46 | u_char igmp_type; /* version & type of IGMP message */ | |
47 | u_char igmp_code; /* unused, should be zero */ | |
48 | u_short igmp_cksum; /* IP-style checksum */ | |
49 | struct in_addr igmp_group; /* group address being reported */ | |
50 | }; /* (zero for queries) */ | |
51 | ||
52 | #define IGMP_MINLEN 8 | |
53 | ||
54 | #define IGMP_HOST_MEMBERSHIP_QUERY 0x11 /* message types, incl. version */ | |
55 | #define IGMP_HOST_MEMBERSHIP_REPORT 0x12 | |
56 | #define IGMP_DVMRP 0x13 /* for experimental multicast */ | |
57 | /* routing protocol */ | |
58 | ||
59 | #define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */ |