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pim6.h revision 1.2 
      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 /*
     30  * Protocol Independent Multicast (PIM) definitions
     31  *
     32  * Written by Ahmed Helmy, SGI, July 1996
     33  *
     34  * MULTICAST
     35  */
     36 
     37 /*
     38  * PIM packet header
     39  */
     40 #define PIM_VERSION	2
     41 struct pim {
     42 #if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
     43 	u_char	pim_type:4, /* the PIM message type, currently they are:
     44 			     * Hello, Register, Register-Stop, Join/Prune,
     45 			     * Bootstrap, Assert, Graft (PIM-DM only),
     46 			     * Graft-Ack (PIM-DM only), C-RP-Adv
     47 			     */
     48 		pim_ver:4;  /* PIM version number; 2 for PIMv2 */
     49 #else
     50 	u_char	pim_ver:4,	/* PIM version */
     51 		pim_type:4;	/* PIM type    */
     52 #endif
     53 	u_char  pim_rsv;	/* Reserved */
     54 	u_short	pim_cksum;	/* IP style check sum */
     55 };
     56 
     57 #define PIM_MINLEN	8		/* The header min. length is 8    */
     58 #define PIM6_REG_MINLEN	(PIM_MINLEN+40)	/* Register message + inner IP6 header */
     59 
     60 /*
     61  * Message types
     62  */
     63 #define PIM_REGISTER	1	/* PIM Register type is 1 */
     64 
     65 /* second bit in reg_head is the null bit */
     66 #define PIM_NULL_REGISTER 0x40000000
     67