bsd/netinet6/pim6.h

   1 /*      $KAME: pim6.h,v 1.2 2000/02/22 14:04:33 itojun Exp $    */
   2
   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 /*
  32  * Protocol Independent Multicast (PIM) definitions
  33  *
  34  * Written by Ahmed Helmy, SGI, July 1996
  35  *
  36  * MULTICAST
  37  */
  38
  39 /*
  40  * PIM packet header
  41  */
  42 #define PIM_VERSION     2
  43 struct pim {
  44 #if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN)
  45         u_char  pim_type:4, /* the PIM message type, currently they are:
  46                              * Hello, Register, Register-Stop, Join/Prune,
  47                              * Bootstrap, Assert, Graft (PIM-DM only),
  48                              * Graft-Ack (PIM-DM only), C-RP-Adv
  49                              */
  50                 pim_ver:4;  /* PIM version number; 2 for PIMv2 */
  51 #else
  52         u_char  pim_ver:4,      /* PIM version */
  53                 pim_type:4;     /* PIM type    */
  54 #endif
  55         u_char  pim_rsv;        /* Reserved */
  56         u_short pim_cksum;      /* IP style check sum */
  57 };
  58
  59 #define PIM_MINLEN      8               /* The header min. length is 8    */
  60 #define PIM6_REG_MINLEN (PIM_MINLEN+40) /* Register message + inner IP6 header */
  61
  62 /*
  63  * Message types
  64  */
  65 #define PIM_REGISTER    1       /* PIM Register type is 1 */
  66
  67 /* second bit in reg_head is the null bit */
  68 #define PIM_NULL_REGISTER 0x40000000