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 */
33/*
34 * Protocol Independent Multicast (PIM) definitions
35 *
36 * Written by Ahmed Helmy, SGI, July 1996
37 *
38 * MULTICAST
39 */
40
41/*
42 * PIM packet header
43 */
44#define PIM_VERSION	2
45struct pim {
46#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
47	u_char	pim_type:4, /* the PIM message type, currently they are:
48			     * Hello, Register, Register-Stop, Join/Prune,
49			     * Bootstrap, Assert, Graft (PIM-DM only),
50			     * Graft-Ack (PIM-DM only), C-RP-Adv
51			     */
52		pim_ver:4;  /* PIM version number; 2 for PIMv2 */
53#else
54	u_char	pim_ver:4,	/* PIM version */
55		pim_type:4;	/* PIM type    */
56#endif
57	u_char  pim_rsv;	/* Reserved */
58	u_short	pim_cksum;	/* IP style check sum */
59};
60
61#define PIM_MINLEN	8		/* The header min. length is 8    */
62#define PIM6_REG_MINLEN	(PIM_MINLEN+40)	/* Register message + inner IP6 header */
63
64/*
65 * Message types
66 */
67#define PIM_REGISTER	1	/* PIM Register type is 1 */
68
69/* second bit in reg_head is the null bit */
70#define PIM_NULL_REGISTER 0x40000000
71