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 * $FreeBSD$ 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 70