1 /* $FreeBSD$ */ 2 /* $KAME: pim6.h,v 1.3 2000/03/25 07:23:58 sumikawa Exp $ */ 3 4 /*- 5 * Copyright (C) 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 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