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freebsd
GitHub Repository: freebsd/freebsd-src
 Path: blob/main/sys/netinet6/pim6.h
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/*-

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 * SPDX-License-Identifier: BSD-3-Clause

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 *

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 * Copyright (C) 1998 WIDE Project.

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 * All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 * 1. Redistributions of source code must retain the above copyright

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 *    notice, this list of conditions and the following disclaimer.

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 * 2. Redistributions in binary form must reproduce the above copyright

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 *    notice, this list of conditions and the following disclaimer in the

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 *    documentation and/or other materials provided with the distribution.

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 * 3. Neither the name of the project nor the names of its contributors

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 *    may be used to endorse or promote products derived from this software

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 *    without specific prior written permission.

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 *

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 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND

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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE

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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

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 * SUCH DAMAGE.

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 *

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 *	$KAME: pim6.h,v 1.3 2000/03/25 07:23:58 sumikawa Exp $

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 */

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/*

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 * Protocol Independent Multicast (PIM) definitions

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 *

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 * Written by Ahmed Helmy, SGI, July 1996

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 *

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 * MULTICAST

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 */

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/*

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 * PIM packet header

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 */

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#define PIM_VERSION	2

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struct pim {

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#if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)

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	u_char	pim_type:4, /* the PIM message type, currently they are:

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			     * Hello, Register, Register-Stop, Join/Prune,

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			     * Bootstrap, Assert, Graft (PIM-DM only),

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			     * Graft-Ack (PIM-DM only), C-RP-Adv

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			     */

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		pim_ver:4;  /* PIM version number; 2 for PIMv2 */

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#else

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	u_char	pim_ver:4,	/* PIM version */

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		pim_type:4;	/* PIM type    */

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#endif

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	u_char  pim_rsv;	/* Reserved */

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	u_short	pim_cksum;	/* IP style check sum */

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};

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#define PIM_MINLEN	8		/* The header min. length is 8    */

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#define PIM6_REG_MINLEN	(PIM_MINLEN+40)	/* Register message + inner IP6 header */

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/*

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 * Message types

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 */

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#define PIM_REGISTER	1	/* PIM Register type is 1 */

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/* second bit in reg_head is the null bit */

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#define PIM_NULL_REGISTER 0x40000000

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