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pim6.h revision 1.2 
      1  1.2  itojun /*
      2  1.2  itojun  * Copyright (C) 1998 WIDE Project.
      3  1.2  itojun  * All rights reserved.
      4  1.2  itojun  *
      5  1.2  itojun  * Redistribution and use in source and binary forms, with or without
      6  1.2  itojun  * modification, are permitted provided that the following conditions
      7  1.2  itojun  * are met:
      8  1.2  itojun  * 1. Redistributions of source code must retain the above copyright
      9  1.2  itojun  *    notice, this list of conditions and the following disclaimer.
     10  1.2  itojun  * 2. Redistributions in binary form must reproduce the above copyright
     11  1.2  itojun  *    notice, this list of conditions and the following disclaimer in the
     12  1.2  itojun  *    documentation and/or other materials provided with the distribution.
     13  1.2  itojun  * 3. Neither the name of the project nor the names of its contributors
     14  1.2  itojun  *    may be used to endorse or promote products derived from this software
     15  1.2  itojun  *    without specific prior written permission.
     16  1.2  itojun  *
     17  1.2  itojun  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     18  1.2  itojun  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     19  1.2  itojun  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     20  1.2  itojun  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     21  1.2  itojun  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  1.2  itojun  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     23  1.2  itojun  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     24  1.2  itojun  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     25  1.2  itojun  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     26  1.2  itojun  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     27  1.2  itojun  * SUCH DAMAGE.
     28  1.2  itojun  */
     29  1.2  itojun /*
     30  1.2  itojun  * Protocol Independent Multicast (PIM) definitions
     31  1.2  itojun  *
     32  1.2  itojun  * Written by Ahmed Helmy, SGI, July 1996
     33  1.2  itojun  *
     34  1.2  itojun  * MULTICAST
     35  1.2  itojun  */
     36  1.2  itojun 
     37  1.2  itojun /*
     38  1.2  itojun  * PIM packet header
     39  1.2  itojun  */
     40  1.2  itojun #define PIM_VERSION	2
     41  1.2  itojun struct pim {
     42  1.2  itojun #if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
     43  1.2  itojun 	u_char	pim_type:4, /* the PIM message type, currently they are:
     44  1.2  itojun 			     * Hello, Register, Register-Stop, Join/Prune,
     45  1.2  itojun 			     * Bootstrap, Assert, Graft (PIM-DM only),
     46  1.2  itojun 			     * Graft-Ack (PIM-DM only), C-RP-Adv
     47  1.2  itojun 			     */
     48  1.2  itojun 		pim_ver:4;  /* PIM version number; 2 for PIMv2 */
     49  1.2  itojun #else
     50  1.2  itojun 	u_char	pim_ver:4,	/* PIM version */
     51  1.2  itojun 		pim_type:4;	/* PIM type    */
     52  1.2  itojun #endif
     53  1.2  itojun 	u_char  pim_rsv;	/* Reserved */
     54  1.2  itojun 	u_short	pim_cksum;	/* IP style check sum */
     55  1.2  itojun };
     56  1.2  itojun 
     57  1.2  itojun #define PIM_MINLEN	8		/* The header min. length is 8    */
     58  1.2  itojun #define PIM6_REG_MINLEN	(PIM_MINLEN+40)	/* Register message + inner IP6 header */
     59  1.2  itojun 
     60  1.2  itojun /*
     61  1.2  itojun  * Message types
     62  1.2  itojun  */
     63  1.2  itojun #define PIM_REGISTER	1	/* PIM Register type is 1 */
     64  1.2  itojun 
     65  1.2  itojun /* second bit in reg_head is the null bit */
     66  1.2  itojun #define PIM_NULL_REGISTER 0x40000000
     67