The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/pim6.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (C) 1998 WIDE Project.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the project nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      $KAME: pim6.h,v 1.3 2000/03/25 07:23:58 sumikawa Exp $
   32  * $FreeBSD: releng/12.0/sys/netinet6/pim6.h 326023 2017-11-20 19:43:44Z pfg $
   33  */
   34 /*
   35  * Protocol Independent Multicast (PIM) definitions
   36  *
   37  * Written by Ahmed Helmy, SGI, July 1996
   38  *
   39  * MULTICAST
   40  */
   41 
   42 /*
   43  * PIM packet header
   44  */
   45 #define PIM_VERSION     2
   46 struct pim {
   47 #if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
   48         u_char  pim_type:4, /* the PIM message type, currently they are:
   49                              * Hello, Register, Register-Stop, Join/Prune,
   50                              * Bootstrap, Assert, Graft (PIM-DM only),
   51                              * Graft-Ack (PIM-DM only), C-RP-Adv
   52                              */
   53                 pim_ver:4;  /* PIM version number; 2 for PIMv2 */
   54 #else
   55         u_char  pim_ver:4,      /* PIM version */
   56                 pim_type:4;     /* PIM type    */
   57 #endif
   58         u_char  pim_rsv;        /* Reserved */
   59         u_short pim_cksum;      /* IP style check sum */
   60 };
   61 
   62 #define PIM_MINLEN      8               /* The header min. length is 8    */
   63 #define PIM6_REG_MINLEN (PIM_MINLEN+40) /* Register message + inner IP6 header */
   64 
   65 /*
   66  * Message types
   67  */
   68 #define PIM_REGISTER    1       /* PIM Register type is 1 */
   69 
   70 /* second bit in reg_head is the null bit */
   71 #define PIM_NULL_REGISTER 0x40000000

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