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pim6.h revision 1.4 
      1 /*	$NetBSD: pim6.h,v 1.4 2001/02/10 04:14:29 itojun Exp $	*/
      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
     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