Some quick code to use UDP-only (no TCP) with mBed. Echos received packets and sends packets when a button is pressed
etharp.h
00001 /* 00002 * Copyright (c) 2001-2003 Swedish Institute of Computer Science. 00003 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv> 00004 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands. 00005 * All rights reserved. 00006 * 00007 * Redistribution and use in source and binary forms, with or without modification, 00008 * are permitted provided that the following conditions are met: 00009 * 00010 * 1. Redistributions of source code must retain the above copyright notice, 00011 * this list of conditions and the following disclaimer. 00012 * 2. Redistributions in binary form must reproduce the above copyright notice, 00013 * this list of conditions and the following disclaimer in the documentation 00014 * and/or other materials provided with the distribution. 00015 * 3. The name of the author may not be used to endorse or promote products 00016 * derived from this software without specific prior written permission. 00017 * 00018 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00019 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00020 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00021 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00022 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00023 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00024 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00025 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00026 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00027 * OF SUCH DAMAGE. 00028 * 00029 * This file is part of the lwIP TCP/IP stack. 00030 * 00031 * Author: Adam Dunkels <adam@sics.se> 00032 * 00033 */ 00034 00035 #ifndef __NETIF_ETHARP_H__ 00036 #define __NETIF_ETHARP_H__ 00037 00038 #include "lwip/opt.h" 00039 00040 #if LWIP_ARP /* don't build if not configured for use in lwipopts.h */ 00041 00042 #include "lwip/pbuf.h" 00043 #include "lwip/ip_addr.h" 00044 #include "lwip/netif.h" 00045 #include "lwip/ip.h" 00046 00047 #ifdef __cplusplus 00048 extern "C" { 00049 #endif 00050 00051 #ifndef ETH_PAD_SIZE 00052 #define ETH_PAD_SIZE 0 00053 #endif 00054 00055 #ifndef ETHARP_HWADDR_LEN 00056 #define ETHARP_HWADDR_LEN 6 00057 #endif 00058 00059 #ifdef PACK_STRUCT_USE_INCLUDES 00060 # include "arch/bpstruct.h" 00061 #endif 00062 PACK_STRUCT_BEGIN 00063 struct eth_addr { 00064 PACK_STRUCT_FIELD(u8_t addr[ETHARP_HWADDR_LEN]); 00065 } PACK_STRUCT_STRUCT; 00066 PACK_STRUCT_END 00067 #ifdef PACK_STRUCT_USE_INCLUDES 00068 # include "arch/epstruct.h" 00069 #endif 00070 00071 #ifdef PACK_STRUCT_USE_INCLUDES 00072 # include "arch/bpstruct.h" 00073 #endif 00074 PACK_STRUCT_BEGIN 00075 struct eth_hdr { 00076 #if ETH_PAD_SIZE 00077 PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]); 00078 #endif 00079 PACK_STRUCT_FIELD(struct eth_addr dest); 00080 PACK_STRUCT_FIELD(struct eth_addr src); 00081 PACK_STRUCT_FIELD(u16_t type); 00082 } PACK_STRUCT_STRUCT; 00083 PACK_STRUCT_END 00084 #ifdef PACK_STRUCT_USE_INCLUDES 00085 # include "arch/epstruct.h" 00086 #endif 00087 00088 #define SIZEOF_ETH_HDR (14 + ETH_PAD_SIZE) 00089 00090 #if ETHARP_SUPPORT_VLAN 00091 00092 #ifdef PACK_STRUCT_USE_INCLUDES 00093 # include "arch/bpstruct.h" 00094 #endif 00095 PACK_STRUCT_BEGIN 00096 struct eth_vlan_hdr { 00097 PACK_STRUCT_FIELD(u16_t tpid); 00098 PACK_STRUCT_FIELD(u16_t prio_vid); 00099 } PACK_STRUCT_STRUCT; 00100 PACK_STRUCT_END 00101 #ifdef PACK_STRUCT_USE_INCLUDES 00102 # include "arch/epstruct.h" 00103 #endif 00104 00105 #define SIZEOF_VLAN_HDR 4 00106 #define VLAN_ID(vlan_hdr) (htons((vlan_hdr)->prio_vid) & 0xFFF) 00107 00108 #endif /* ETHARP_SUPPORT_VLAN */ 00109 00110 #ifdef PACK_STRUCT_USE_INCLUDES 00111 # include "arch/bpstruct.h" 00112 #endif 00113 PACK_STRUCT_BEGIN 00114 /** the ARP message */ 00115 struct etharp_hdr { 00116 PACK_STRUCT_FIELD(u16_t hwtype); 00117 PACK_STRUCT_FIELD(u16_t proto); 00118 PACK_STRUCT_FIELD(u16_t _hwlen_protolen); 00119 PACK_STRUCT_FIELD(u16_t opcode); 00120 PACK_STRUCT_FIELD(struct eth_addr shwaddr); 00121 PACK_STRUCT_FIELD(struct ip_addr2 sipaddr); 00122 PACK_STRUCT_FIELD(struct eth_addr dhwaddr); 00123 PACK_STRUCT_FIELD(struct ip_addr2 dipaddr); 00124 } PACK_STRUCT_STRUCT; 00125 PACK_STRUCT_END 00126 #ifdef PACK_STRUCT_USE_INCLUDES 00127 # include "arch/epstruct.h" 00128 #endif 00129 00130 #define SIZEOF_ETHARP_HDR 28 00131 #define SIZEOF_ETHARP_PACKET (SIZEOF_ETH_HDR + SIZEOF_ETHARP_HDR) 00132 00133 /** 5 seconds period */ 00134 #define ARP_TMR_INTERVAL 5000 00135 00136 #define ETHTYPE_ARP 0x0806 00137 #define ETHTYPE_IP 0x0800 00138 #define ETHTYPE_VLAN 0x8100 00139 #define ETHTYPE_PPPOEDISC 0x8863 /* PPP Over Ethernet Discovery Stage */ 00140 #define ETHTYPE_PPPOE 0x8864 /* PPP Over Ethernet Session Stage */ 00141 00142 /** ARP message types (opcodes) */ 00143 #define ARP_REQUEST 1 00144 #define ARP_REPLY 2 00145 00146 #if ARP_QUEUEING 00147 /** struct for queueing outgoing packets for unknown address 00148 * defined here to be accessed by memp.h 00149 */ 00150 struct etharp_q_entry { 00151 struct etharp_q_entry *next; 00152 struct pbuf *p; 00153 }; 00154 #endif /* ARP_QUEUEING */ 00155 00156 #define etharp_init() /* Compatibility define, not init needed. */ 00157 void etharp_tmr(void); 00158 s8_t etharp_find_addr(struct netif *netif, struct ip_addr *ipaddr, 00159 struct eth_addr **eth_ret, struct ip_addr **ip_ret); 00160 void etharp_ip_input(struct netif *netif, struct pbuf *p); 00161 void etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, 00162 struct pbuf *p); 00163 err_t etharp_output(struct netif *netif, struct pbuf *q, struct ip_addr *ipaddr); 00164 err_t etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q); 00165 err_t etharp_request(struct netif *netif, struct ip_addr *ipaddr); 00166 /** For Ethernet network interfaces, we might want to send "gratuitous ARP"; 00167 * this is an ARP packet sent by a node in order to spontaneously cause other 00168 * nodes to update an entry in their ARP cache. 00169 * From RFC 3220 "IP Mobility Support for IPv4" section 4.6. */ 00170 #define etharp_gratuitous(netif) etharp_request((netif), &(netif)->ip_addr) 00171 00172 err_t ethernet_input(struct pbuf *p, struct netif *netif); 00173 00174 #if LWIP_AUTOIP 00175 err_t etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr, 00176 const struct eth_addr *ethdst_addr, 00177 const struct eth_addr *hwsrc_addr, const struct ip_addr *ipsrc_addr, 00178 const struct eth_addr *hwdst_addr, const struct ip_addr *ipdst_addr, 00179 const u16_t opcode); 00180 #endif /* LWIP_AUTOIP */ 00181 00182 #define eth_addr_cmp(addr1, addr2) (memcmp((addr1)->addr, (addr2)->addr, ETHARP_HWADDR_LEN) == 0) 00183 00184 extern const struct eth_addr ethbroadcast, ethzero; 00185 00186 #ifdef __cplusplus 00187 } 00188 #endif 00189 00190 #endif /* LWIP_ARP */ 00191 00192 #endif /* __NETIF_ARP_H__ */
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