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

     /*-
      * Copyright (C) 1998 WIDE Project.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      $KAME: pim6.h,v 1.3 2000/03/25 07:23:58 sumikawa Exp $
     * $FreeBSD: releng/8.4/sys/netinet6/pim6.h 174510 2007-12-10 16:03:40Z obrien $
     */
    /*
     * Protocol Independent Multicast (PIM) definitions
     *
     * Written by Ahmed Helmy, SGI, July 1996
     *
     * MULTICAST
     */
    
    /*
     * PIM packet header
     */
    #define PIM_VERSION     2
    struct pim {
    #if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
            u_char  pim_type:4, /* the PIM message type, currently they are:
                                 * Hello, Register, Register-Stop, Join/Prune,
                                 * Bootstrap, Assert, Graft (PIM-DM only),
                                 * Graft-Ack (PIM-DM only), C-RP-Adv
                                 */
                    pim_ver:4;  /* PIM version number; 2 for PIMv2 */
    #else
            u_char  pim_ver:4,      /* PIM version */
                    pim_type:4;     /* PIM type    */
    #endif
            u_char  pim_rsv;        /* Reserved */
            u_short pim_cksum;      /* IP style check sum */
    };
    
    #define PIM_MINLEN      8               /* The header min. length is 8    */
    #define PIM6_REG_MINLEN (PIM_MINLEN+40) /* Register message + inner IP6 header */
    
    /*
     * Message types
     */
    #define PIM_REGISTER    1       /* PIM Register type is 1 */
    
    /* second bit in reg_head is the null bit */
    #define PIM_NULL_REGISTER 0x40000000

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