1 /** 2 * @file 3 * IGMP protocol definitions 4 */ 5 6 /* 7 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without modification, 11 * are permitted provided that the following conditions are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright notice, 16 * this list of conditions and the following disclaimer in the documentation 17 * and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 24 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 26 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 29 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 30 * OF SUCH DAMAGE. 31 * 32 * This file is part of the lwIP TCP/IP stack. 33 * 34 * Author: Adam Dunkels <adam@sics.se> 35 * 36 */ 37 #ifndef LWIP_HDR_PROT_IGMP_H 38 #define LWIP_HDR_PROT_IGMP_H 39 40 #include "lwip/arch.h" 41 #include "lwip/prot/ip4.h" 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 47 /* 48 * IGMP constants 49 */ 50 #define IGMP_TTL 1 51 #define IGMP_MINLEN 8 52 #define ROUTER_ALERT 0x9404U 53 #define ROUTER_ALERTLEN 4 54 55 /* 56 * IGMP message types, including version number. 57 */ 58 #define IGMP_MEMB_QUERY 0x11 /* Membership query */ 59 #define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */ 60 #define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */ 61 #define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */ 62 63 /* Group membership states */ 64 #define IGMP_GROUP_NON_MEMBER 0 65 #define IGMP_GROUP_DELAYING_MEMBER 1 66 #define IGMP_GROUP_IDLE_MEMBER 2 67 68 /** 69 * IGMP packet format. 70 */ 71 #ifdef PACK_STRUCT_USE_INCLUDES 72 # include "arch/bpstruct.h" 73 #endif 74 PACK_STRUCT_BEGIN 75 struct igmp_msg { 76 PACK_STRUCT_FLD_8(u8_t igmp_msgtype); 77 PACK_STRUCT_FLD_8(u8_t igmp_maxresp); 78 PACK_STRUCT_FIELD(u16_t igmp_checksum); 79 PACK_STRUCT_FLD_S(ip4_addr_p_t igmp_group_address); 80 } PACK_STRUCT_STRUCT; 81 PACK_STRUCT_END 82 #ifdef PACK_STRUCT_USE_INCLUDES 83 # include "arch/epstruct.h" 84 #endif 85 86 #ifdef __cplusplus 87 } 88 #endif 89 90 #endif /* LWIP_HDR_PROT_IGMP_H */ 91