xref: /freebsd/sys/netinet6/pim6.h (revision 8fc257994d0ce2396196d7a06d50d20c8015f4b7)
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  *	$KAME: pim6.h,v 1.3 2000/03/25 07:23:58 sumikawa Exp $
30  * $FreeBSD$
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
44 struct 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