pim6.h revision 139826 
1/*	$FreeBSD: head/sys/netinet6/pim6.h 139826 2005-01-07 02:30:35Z imp $	*/
2/*	$KAME: pim6.h,v 1.3 2000/03/25 07:23:58 sumikawa Exp $	*/
3
4/*-
5 * Copyright (C) 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32/*
33 * Protocol Independent Multicast (PIM) definitions
34 *
35 * Written by Ahmed Helmy, SGI, July 1996
36 *
37 * MULTICAST
38 */
39
40/*
41 * PIM packet header
42 */
43#define PIM_VERSION	2
44struct pim {
45#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
46	u_char	pim_type:4, /* the PIM message type, currently they are:
47			     * Hello, Register, Register-Stop, Join/Prune,
48			     * Bootstrap, Assert, Graft (PIM-DM only),
49			     * Graft-Ack (PIM-DM only), C-RP-Adv
50			     */
51		pim_ver:4;  /* PIM version number; 2 for PIMv2 */
52#else
53	u_char	pim_ver:4,	/* PIM version */
54		pim_type:4;	/* PIM type    */
55#endif
56	u_char  pim_rsv;	/* Reserved */
57	u_short	pim_cksum;	/* IP style check sum */
58};
59
60#define PIM_MINLEN	8		/* The header min. length is 8    */
61#define PIM6_REG_MINLEN	(PIM_MINLEN+40)	/* Register message + inner IP6 header */
62
63/*
64 * Message types
65 */
66#define PIM_REGISTER	1	/* PIM Register type is 1 */
67
68/* second bit in reg_head is the null bit */
69#define PIM_NULL_REGISTER 0x40000000
70