1/*
2 * Copyright (C) 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: head/sys/netinet6/pim6.h 53541 1999-11-22 02:45:11Z shin $
30 */
31/*
32 * Protocol Independent Multicast (PIM) definitions
33 *
34 * Written by Ahmed Helmy, SGI, July 1996
35 *
36 * MULTICAST
37 */
38
39/*
40 * PIM packet header
41 */
42#define PIM_VERSION 2
43struct pim {
44#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
45 u_char pim_type:4, /* the PIM message type, currently they are:
46 * Hello, Register, Register-Stop, Join/Prune,
47 * Bootstrap, Assert, Graft (PIM-DM only),
48 * Graft-Ack (PIM-DM only), C-RP-Adv
49 */
50 pim_ver:4; /* PIM version number; 2 for PIMv2 */
51#else
52 u_char pim_ver:4, /* PIM version */
53 pim_type:4; /* PIM type */
54#endif
55 u_char pim_rsv; /* Reserved */
56 u_short pim_cksum; /* IP style check sum */
57};
58
59#define PIM_MINLEN 8 /* The header min. length is 8 */
60#define PIM6_REG_MINLEN (PIM_MINLEN+40) /* Register message + inner IP6 header */
61
62/*
63 * Message types
64 */
65#define PIM_REGISTER 1 /* PIM Register type is 1 */
66
67/* second bit in reg_head is the null bit */
68#define PIM_NULL_REGISTER 0x40000000