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Annotation of src/sys/netinet6/pim6.h, Revision 1.3

1.3     ! thorpej     1: /*     $NetBSD$        */
        !             2:
1.2       itojun      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