Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
igmp.h
00001 /* 00002 * Copyright (c) 2002 CITEL Technologies Ltd. 00003 * All rights reserved. 00004 * 00005 * Redistribution and use in source and binary forms, with or without 00006 * modification, are permitted provided that the following conditions 00007 * are met: 00008 * 1. Redistributions of source code must retain the above copyright 00009 * notice, this list of conditions and the following disclaimer. 00010 * 2. Redistributions in binary form must reproduce the above copyright 00011 * notice, this list of conditions and the following disclaimer in the 00012 * documentation and/or other materials provided with the distribution. 00013 * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors 00014 * may be used to endorse or promote products derived from this software 00015 * without specific prior written permission. 00016 * 00017 * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS'' 00018 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00019 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00020 * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE 00021 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00022 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00023 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00024 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00025 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00026 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00027 * SUCH DAMAGE. 00028 * 00029 * This file is a contribution to the lwIP TCP/IP stack. 00030 * The Swedish Institute of Computer Science and Adam Dunkels 00031 * are specifically granted permission to redistribute this 00032 * source code. 00033 */ 00034 00035 #ifndef __LWIP_IGMP_H__ 00036 #define __LWIP_IGMP_H__ 00037 00038 #include "lwip/opt.h" 00039 #include "lwip/ip_addr.h" 00040 #include "lwip/netif.h" 00041 #include "lwip/pbuf.h" 00042 00043 #if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */ 00044 00045 #ifdef __cplusplus 00046 extern "C" { 00047 #endif 00048 00049 /* 00050 * IGMP constants 00051 */ 00052 #define IP_PROTO_IGMP 2 00053 #define IGMP_TTL 1 00054 #define IGMP_MINLEN 8 00055 #define ROUTER_ALERT 0x9404 00056 #define ROUTER_ALERTLEN 4 00057 00058 /* 00059 * IGMP message types, including version number. 00060 */ 00061 #define IGMP_MEMB_QUERY 0x11 /* Membership query */ 00062 #define IGMP_V1_MEMB_REPORT 0x12 /* Ver. 1 membership report */ 00063 #define IGMP_V2_MEMB_REPORT 0x16 /* Ver. 2 membership report */ 00064 #define IGMP_LEAVE_GROUP 0x17 /* Leave-group message */ 00065 00066 /* IGMP timer */ 00067 #define IGMP_TMR_INTERVAL 100 /* Milliseconds */ 00068 #define IGMP_V1_DELAYING_MEMBER_TMR (1000/IGMP_TMR_INTERVAL) 00069 #define IGMP_JOIN_DELAYING_MEMBER_TMR (500 /IGMP_TMR_INTERVAL) 00070 00071 /* MAC Filter Actions */ 00072 #define IGMP_DEL_MAC_FILTER 0 00073 #define IGMP_ADD_MAC_FILTER 1 00074 00075 /* Group membership states */ 00076 #define IGMP_GROUP_NON_MEMBER 0 00077 #define IGMP_GROUP_DELAYING_MEMBER 1 00078 #define IGMP_GROUP_IDLE_MEMBER 2 00079 00080 /* 00081 * IGMP packet format. 00082 */ 00083 #ifdef PACK_STRUCT_USE_INCLUDES 00084 # include "arch/bpstruct.h" 00085 #endif 00086 PACK_STRUCT_BEGIN 00087 struct igmp_msg { 00088 PACK_STRUCT_FIELD(u8_t igmp_msgtype); 00089 PACK_STRUCT_FIELD(u8_t igmp_maxresp); 00090 PACK_STRUCT_FIELD(u16_t igmp_checksum); 00091 PACK_STRUCT_FIELD(struct ip_addr igmp_group_address); 00092 } PACK_STRUCT_STRUCT; 00093 PACK_STRUCT_END 00094 #ifdef PACK_STRUCT_USE_INCLUDES 00095 # include "arch/epstruct.h" 00096 #endif 00097 00098 /* 00099 * now a group structure - there is 00100 * a list of groups for each interface 00101 * these should really be linked from the interface, but 00102 * if we keep them separate we will not affect the lwip original code 00103 * too much 00104 * 00105 * There will be a group for the all systems group address but this 00106 * will not run the state machine as it is used to kick off reports 00107 * from all the other groups 00108 */ 00109 00110 struct igmp_group { 00111 struct igmp_group *next; 00112 struct netif *interface; 00113 struct ip_addr group_address; 00114 u8_t last_reporter_flag; /* signifies we were the last person to report */ 00115 u8_t group_state; 00116 u16_t timer; 00117 u8_t use; /* counter of simultaneous uses */ 00118 }; 00119 00120 00121 /* Prototypes */ 00122 void igmp_init(void); 00123 00124 err_t igmp_start( struct netif *netif); 00125 00126 err_t igmp_stop( struct netif *netif); 00127 00128 void igmp_report_groups( struct netif *netif); 00129 00130 struct igmp_group *igmp_lookfor_group( struct netif *ifp, struct ip_addr *addr); 00131 00132 struct igmp_group *igmp_lookup_group( struct netif *ifp, struct ip_addr *addr); 00133 00134 err_t igmp_remove_group( struct igmp_group *group); 00135 00136 void igmp_input( struct pbuf *p, struct netif *inp, struct ip_addr *dest); 00137 00138 err_t igmp_joingroup( struct ip_addr *ifaddr, struct ip_addr *groupaddr); 00139 00140 err_t igmp_leavegroup( struct ip_addr *ifaddr, struct ip_addr *groupaddr); 00141 00142 void igmp_tmr(void); 00143 00144 void igmp_timeout( struct igmp_group *group); 00145 00146 void igmp_start_timer( struct igmp_group *group, u8_t max_time); 00147 00148 void igmp_stop_timer( struct igmp_group *group); 00149 00150 void igmp_delaying_member( struct igmp_group *group, u8_t maxresp); 00151 00152 err_t igmp_ip_output_if( struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, u8_t ttl, u8_t proto, struct netif *netif); 00153 00154 void igmp_send( struct igmp_group *group, u8_t type); 00155 00156 #ifdef __cplusplus 00157 } 00158 #endif 00159 00160 #endif /* LWIP_IGMP */ 00161 00162 #endif /* __LWIP_IGMP_H__ */
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