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<!DOCTYPE <h <t <link </head><body> <!-- <div <div <a <h 00002 00003 00004 00005 00006 00007 00008 00009 00010 00011 00012 00013 00014 00015 00016 00017 00018 00019 00020 00021 00022 00023 00024 00025 00026 { 00027 00028 00029 00030 00031 <a <a 00034 00035 <a 00037 { 00038 u08 i; 00039 00040 00041 { 00042 00043 00044 } 00045 } 00046 <a 00048 { 00049 00050 00051 00052 } 00053 <a 00055 { 00056 00057 00058 00059 00060 00061 00062 00063 00064 00065 { 00066 00067 00068 00069 00070 00071 00072 00073 00074 00075 00076 00077 00078 00079 00080 00081 00082 00083 00084 00085 00086 00087 } 00088 } 00089 <a 00091 { 00092 int8_t index; 00093 00094 00095 00096 00097 { 00098 00099 00100 00101 00102 } 00103 00104 00105 00106 00107 { 00108 00109 { 00110 00111 00112 00113 00114 00115 00116 } 00117 } 00118 00119 00120 } 00121 <a 00123 { 00124 00125 00126 00127 00128 00129 00130 00131 00132 00133 { 00134 00135 00136 00137 00138 } 00139 00140 { 00141 00142 00143 00144 00145 00146 00147 00148 00149 00150 00151 } 00152 } 00153 <a 00155 { 00156 00157 00158 00159 00160 00161 { 00162 00163 00164 } 00165 } 00166 <a 00168 { 00169 uint8_t i; 00170 00171 00172 00173 { 00174 00175 { 00176 00177 00178 } 00179 } 00180 00181 00182 00183 } 00184 00185 00186 00187 { 00188 00189 00190 00191 00192 00193 00194 00195 00196 00197 00198 00199 00200 00201 00202 00203 00204 00205 00206 00207 } 00208 00209 00210 00211 { 00212 uint8_t i; 00213 00214 00215 00216 00217 00218 { 00219 00220 00221 00222 00223 00224 00225 } 00226 } 00227 </ <a <img </body> </html>

HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> tml><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"> itle>Procyon AVRlib: net/arp.c Source File</title> href="dox.css" rel="stylesheet" type="text/css"> Generated by Doxygen 1.4.2 --> class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="modules.html">Modules</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="dirs.html">Directories</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a> | <a class="qindex" href="pages.html">Related Pages</a></div> class="nav"> class="el" href="dir_000001.html">net</a></div> 1>arp.c</h1><a href="arp_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 /*! \file arp.c \brief ARP Protocol Library. */ //***************************************************************************** // // File Name : 'arp.c' // Title : ARP Protocol Library // Author : Pascal Stang // Created : 9/7/2004 // Revised : 7/3/2005 // Version : 0.1 // Target MCU : Atmel AVR series // Editor Tabs : 4 // //***************************************************************************** #include "<a class="code" href="global_8h.html">global.h</a>" #include "<a class="code" href="net_8h.html">net.h</a>" #include "<a class="code" href="nic_8h.html">nic.h</a>" #include "<a class="code" href="arp_8h.html">arp.h</a>" #include "<a class="code" href="rprintf_8h.html">rprintf.h</a>" // global variables /// Single ARP table entry/record struct ArpEntry uint32_t ipaddr; ///< remote-note IP address struct netEthAddr ethaddr; ///< remote-node ethernet (hardware/mac) address uint8_t time; ///< time to live (in ARP table); this is decremented by arpTimer() }; name="l00032"></a><a class="code" href="arp_8c.html#a0">00032</a> struct ArpEntry ArpMyAddr; ///< my local interface information (IP and MAC address) name="l00033"></a><a class="code" href="arp_8c.html#a1">00033</a> struct ArpEntry ArpTable[ARP_TABLE_SIZE]; ///< ARP table of matched IP<->MAC associations name="l00036"></a><a class="code" href="group__arp.html#ga0">00036</a> void <a class="code" href="group__arp.html#ga0">arpInit</a>(void) // initialize all ArpTable elements to unused for(i=0; i<ARP_TABLE_SIZE; i++) ArpTable[i].ipaddr = 0; ArpTable[i].time = 0; name="l00047"></a><a class="code" href="group__arp.html#ga1">00047</a> void <a class="code" href="group__arp.html#ga1">arpSetAddress</a>(struct netEthAddr* myeth, uint32_t myip) // set local address record ArpMyAddr.ethaddr = *myeth; ArpMyAddr.ipaddr = myip; name="l00054"></a><a class="code" href="group__arp.html#ga2">00054</a> void <a class="code" href="group__arp.html#ga2">arpArpIn</a>(unsigned int len, struct netEthArpHeader* packet) #ifdef ARP_DEBUG <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Received ARP Request\r\n"); <a class="code" href="group__arp.html#ga7">arpPrintHeader</a>( &packet->arp ); #endif // for now, we just reply to requests // need to add ARP cache if( (packet->arp.dipaddr == <a class="code" href="group__net.html#ga34">HTONL</a>(ArpMyAddr.ipaddr)) && (packet->arp.opcode == <a class="code" href="group__net.html#ga2">htons</a>(ARP_OPCODE_REQUEST)) ) // in ARP header // copy sender's address info to dest. fields packet->arp.dhwaddr = packet->arp.shwaddr; packet->arp.dipaddr = packet->arp.sipaddr; // fill in our information packet->arp.shwaddr = ArpMyAddr.ethaddr; packet->arp.sipaddr = <a class="code" href="group__net.html#ga34">HTONL</a>(ArpMyAddr.ipaddr); // change op to reply packet->arp.opcode = <a class="code" href="group__net.html#ga2">htons</a>(ARP_OPCODE_REPLY); // in ethernet header packet->eth.dest = packet->eth.src; packet->eth.src = ArpMyAddr.ethaddr; #ifdef ARP_DEBUG <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Sending ARP Reply\r\n"); <a class="code" href="group__arp.html#ga7">arpPrintHeader</a>( &packet->arp ); #endif // send reply! <a class="code" href="group__nic.html#ga1">nicSend</a>(len, (unsigned char*)packet); name="l00090"></a><a class="code" href="group__arp.html#ga3">00090</a> void <a class="code" href="group__arp.html#ga3">arpIpIn</a>(struct netEthIpHeader* packet) // check if sender is already present in arp table index = <a class="code" href="group__arp.html#ga6">arpMatchIp</a>(<a class="code" href="group__net.html#ga34">HTONL</a>(packet->ip.srcipaddr)); if(index != -1) // sender's IP address found, update ARP entry ArpTable[index].ethaddr = packet->eth.src; // and we're done return; // sender was not present in table, // must add in empty/expired slot for(index=0; index<ARP_TABLE_SIZE; index++) if(!ArpTable[index].time) // write entry ArpTable[index].ethaddr = packet->eth.src; ArpTable[index].ipaddr = <a class="code" href="group__net.html#ga34">HTONL</a>(packet->ip.srcipaddr); ArpTable[index].time = ARP_CACHE_TIME_TO_LIVE; // and we're done return; // no space in table, we give up name="l00122"></a><a class="code" href="group__arp.html#ga4">00122</a> void <a class="code" href="group__arp.html#ga4">arpIpOut</a>(struct netEthIpHeader* packet, uint32_t phyDstIp) int index; // check if destination is already present in arp table // use the physical dstIp if it's provided, otherwise the dstIp in packet if(phyDstIp) index = <a class="code" href="group__arp.html#ga6">arpMatchIp</a>(phyDstIp); else index = <a class="code" href="group__arp.html#ga6">arpMatchIp</a>(<a class="code" href="group__net.html#ga34">HTONL</a>(packet->ip.destipaddr)); // fill in ethernet info if(index != -1) // ARP entry present, fill eth address(es) packet->eth.src = ArpMyAddr.ethaddr; packet->eth.dest = ArpTable[index].ethaddr; packet->eth.type = <a class="code" href="group__net.html#ga33">HTONS</a>(ETHTYPE_IP); else // not in table, must send ARP request packet->eth.src = ArpMyAddr.ethaddr; // MUST CHANGE, but for now, send this one broadcast packet->eth.dest.addr[0] = 0xFF; packet->eth.dest.addr[1] = 0xFF; packet->eth.dest.addr[2] = 0xFF; packet->eth.dest.addr[3] = 0xFF; packet->eth.dest.addr[4] = 0xFF; packet->eth.dest.addr[5] = 0xFF; packet->eth.type = <a class="code" href="group__net.html#ga33">HTONS</a>(ETHTYPE_IP); name="l00154"></a><a class="code" href="group__arp.html#ga5">00154</a> void <a class="code" href="group__arp.html#ga5">arpTimer</a>(void) int index; // this function meant to be called on a regular time interval // decrement time-to-live for all entries for(index=0; index<ARP_TABLE_SIZE; index++) if(ArpTable[index].time) ArpTable[index].time--; name="l00167"></a><a class="code" href="group__arp.html#ga6">00167</a> int <a class="code" href="group__arp.html#ga6">arpMatchIp</a>(uint32_t ipaddr) // check if IP address is present in arp table for(i=0; i<ARP_TABLE_SIZE; i++) if(ArpTable[i].ipaddr == ipaddr) // IP address found return i; // no match return -1; #ifdef ARP_DEBUG_PRINT void <a class="code" href="group__arp.html#ga7">arpPrintHeader</a>(struct netArpHeader* packet) <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("ARP Packet:\r\n"); //debugPrintHexTable(60, (unsigned char*)&packet); // print operation type <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Operation : "); if(packet->opcode == <a class="code" href="group__net.html#ga2">htons</a>(ARP_OPCODE_REQUEST)) <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("REQUEST"); else if(packet->opcode == <a class="code" href="group__net.html#ga2">htons</a>(ARP_OPCODE_REPLY)) <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("REPLY"); else <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("UNKNOWN"); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); // print source hardware address <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("SrcHwAddr : "); <a class="code" href="group__net.html#ga5">netPrintEthAddr</a>(&packet->shwaddr); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); // print source protocol address <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("SrcProtoAddr: "); <a class="code" href="group__net.html#ga6">netPrintIPAddr</a>(<a class="code" href="group__net.html#ga34">HTONL</a>(packet->sipaddr)); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); // print target hardware address <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("DstHwAddr : "); <a class="code" href="group__net.html#ga5">netPrintEthAddr</a>(&packet->dhwaddr); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); // print target protocol address <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("DstProtoAddr: "); <a class="code" href="group__net.html#ga6">netPrintIPAddr</a>(<a class="code" href="group__net.html#ga34">HTONL</a>(packet->dipaddr)); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); void <a class="code" href="group__arp.html#ga8">arpPrintTable</a>(void) // print ARP table <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("Time Eth Address IP Address\r\n"); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>("---------------------------------------\r\n"); for(i=0; i<ARP_TABLE_SIZE; i++) <a class="code" href="group__rprintf.html#ga7">rprintfu08</a>(ArpTable[i].time); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(" "); <a class="code" href="group__net.html#ga5">netPrintEthAddr</a>(&ArpTable[i].ethaddr); <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(" "); <a class="code" href="group__net.html#ga6">netPrintIPAddr</a>(ArpTable[i].ipaddr); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); #endif pre></div><hr size="1"><address style="align: right;">Generated on Sun Oct 29 03:41:07 2006 for Procyon AVRlib by  href="http://www.doxygen.org/index.html"> src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </address>

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