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  * 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  *      $KAME: pim6.h,v 1.3 2000/03/25 07:23:58 sumikawa Exp $
   30  * $FreeBSD: releng/9.2/sys/netinet6/pim6.h 174510 2007-12-10 16:03:40Z obrien $
   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

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