1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * $KAME: pim6.h,v 1.3 2000/03/25 07:23:58 sumikawa Exp $ 32 * $FreeBSD$ 33 */ 34 /* 35 * Protocol Independent Multicast (PIM) definitions 36 * 37 * Written by Ahmed Helmy, SGI, July 1996 38 * 39 * MULTICAST 40 */ 41 42 /* 43 * PIM packet header 44 */ 45 #define PIM_VERSION 2 46 struct pim { 47 #if defined(BYTE_ORDER) && (BYTE_ORDER == LITTLE_ENDIAN) 48 u_char pim_type:4, /* the PIM message type, currently they are: 49 * Hello, Register, Register-Stop, Join/Prune, 50 * Bootstrap, Assert, Graft (PIM-DM only), 51 * Graft-Ack (PIM-DM only), C-RP-Adv 52 */ 53 pim_ver:4; /* PIM version number; 2 for PIMv2 */ 54 #else 55 u_char pim_ver:4, /* PIM version */ 56 pim_type:4; /* PIM type */ 57 #endif 58 u_char pim_rsv; /* Reserved */ 59 u_short pim_cksum; /* IP style check sum */ 60 }; 61 62 #define PIM_MINLEN 8 /* The header min. length is 8 */ 63 #define PIM6_REG_MINLEN (PIM_MINLEN+40) /* Register message + inner IP6 header */ 64 65 /* 66 * Message types 67 */ 68 #define PIM_REGISTER 1 /* PIM Register type is 1 */ 69 70 /* second bit in reg_head is the null bit */ 71 #define PIM_NULL_REGISTER 0x40000000 72