1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	$KAME: pim6.h,v 1.3 2000/03/25 07:23:58 sumikawa Exp $
32 * $FreeBSD$
33 */
34/*
35 * Protocol Independent Multicast (PIM) definitions
36 *
37 * Written by Ahmed Helmy, SGI, July 1996
38 *
39 * MULTICAST
40 */
41
42/*
43 * PIM packet header
44 */
45#define PIM_VERSION	2
46struct pim {
47#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
48	u_char	pim_type:4, /* the PIM message type, currently they are:
49			     * Hello, Register, Register-Stop, Join/Prune,
50			     * Bootstrap, Assert, Graft (PIM-DM only),
51			     * Graft-Ack (PIM-DM only), C-RP-Adv
52			     */
53		pim_ver:4;  /* PIM version number; 2 for PIMv2 */
54#else
55	u_char	pim_ver:4,	/* PIM version */
56		pim_type:4;	/* PIM type    */
57#endif
58	u_char  pim_rsv;	/* Reserved */
59	u_short	pim_cksum;	/* IP style check sum */
60};
61
62#define PIM_MINLEN	8		/* The header min. length is 8    */
63#define PIM6_REG_MINLEN	(PIM_MINLEN+40)	/* Register message + inner IP6 header */
64
65/*
66 * Message types
67 */
68#define PIM_REGISTER	1	/* PIM Register type is 1 */
69
70/* second bit in reg_head is the null bit */
71#define PIM_NULL_REGISTER 0x40000000
72