pim6.h revision 53541 
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
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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
69