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| 3 | <title>Procyon AVRlib: net/arp.c Source File</title> |
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| 10 | <h1>arp.c</h1><a href="arp_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file arp.c \brief ARP Protocol Library. */</span> |
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| 11 | 00002 <span class="comment">//*****************************************************************************</span> |
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| 12 | 00003 <span class="comment">//</span> |
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| 13 | 00004 <span class="comment">// File Name : 'arp.c'</span> |
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| 14 | 00005 <span class="comment">// Title : ARP Protocol Library</span> |
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| 15 | 00006 <span class="comment">// Author : Pascal Stang</span> |
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| 16 | 00007 <span class="comment">// Created : 9/7/2004</span> |
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| 17 | 00008 <span class="comment">// Revised : 7/3/2005</span> |
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| 18 | 00009 <span class="comment">// Version : 0.1</span> |
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| 19 | 00010 <span class="comment">// Target MCU : Atmel AVR series</span> |
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| 20 | 00011 <span class="comment">// Editor Tabs : 4</span> |
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| 21 | 00012 <span class="comment">//</span> |
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| 22 | 00013 <span class="comment">//*****************************************************************************</span> |
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| 23 | 00014 |
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| 24 | 00015 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span> |
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| 25 | 00016 <span class="preprocessor">#include "<a class="code" href="net_8h.html">net.h</a>"</span> |
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| 26 | 00017 <span class="preprocessor">#include "<a class="code" href="nic_8h.html">nic.h</a>"</span> |
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| 27 | 00018 <span class="preprocessor">#include "<a class="code" href="arp_8h.html">arp.h</a>"</span> |
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| 28 | 00019 |
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| 29 | 00020 <span class="preprocessor">#include "<a class="code" href="rprintf_8h.html">rprintf.h</a>"</span> |
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| 30 | 00021 |
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| 31 | 00022 <span class="comment">// global variables</span> |
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| 32 | 00023 <span class="comment"></span> |
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| 33 | 00024 <span class="comment">/// Single ARP table entry/record</span> |
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| 34 | 00025 <span class="comment"></span><span class="keyword">struct </span>ArpEntry |
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| 35 | 00026 { |
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| 36 | 00027 uint32_t ipaddr; <span class="comment">///< remote-note IP address</span> |
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| 37 | 00028 <span class="comment"></span> <span class="keyword">struct </span>netEthAddr ethaddr; <span class="comment">///< remote-node ethernet (hardware/mac) address</span> |
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| 38 | 00029 <span class="comment"></span> uint8_t time; <span class="comment">///< time to live (in ARP table); this is decremented by arpTimer()</span> |
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| 39 | 00030 <span class="comment"></span>}; |
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| 40 | 00031 |
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| 41 | <a name="l00032"></a><a class="code" href="arp_8c.html#a0">00032</a> <span class="keyword">struct </span>ArpEntry ArpMyAddr; <span class="comment">///< my local interface information (IP and MAC address)</span> |
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| 42 | <a name="l00033"></a><a class="code" href="arp_8c.html#a1">00033</a> <span class="comment"></span><span class="keyword">struct </span>ArpEntry ArpTable[ARP_TABLE_SIZE]; <span class="comment">///< ARP table of matched IP<->MAC associations</span> |
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| 43 | 00034 <span class="comment"></span> |
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| 44 | 00035 |
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| 45 | <a name="l00036"></a><a class="code" href="group__arp.html#ga0">00036</a> <span class="keywordtype">void</span> <a class="code" href="group__arp.html#ga0">arpInit</a>(<span class="keywordtype">void</span>) |
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| 46 | 00037 { |
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| 47 | 00038 u08 i; |
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| 48 | 00039 <span class="comment">// initialize all ArpTable elements to unused</span> |
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| 49 | 00040 <span class="keywordflow">for</span>(i=0; i<ARP_TABLE_SIZE; i++) |
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| 50 | 00041 { |
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| 51 | 00042 ArpTable[i].ipaddr = 0; |
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| 52 | 00043 ArpTable[i].time = 0; |
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| 53 | 00044 } |
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| 54 | 00045 } |
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| 55 | 00046 |
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| 56 | <a name="l00047"></a><a class="code" href="group__arp.html#ga1">00047</a> <span class="keywordtype">void</span> <a class="code" href="group__arp.html#ga1">arpSetAddress</a>(<span class="keyword">struct</span> netEthAddr* myeth, uint32_t myip) |
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| 57 | 00048 { |
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| 58 | 00049 <span class="comment">// set local address record</span> |
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| 59 | 00050 ArpMyAddr.ethaddr = *myeth; |
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| 60 | 00051 ArpMyAddr.ipaddr = myip; |
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| 61 | 00052 } |
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| 62 | 00053 |
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| 63 | <a name="l00054"></a><a class="code" href="group__arp.html#ga2">00054</a> <span class="keywordtype">void</span> <a class="code" href="group__arp.html#ga2">arpArpIn</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> len, <span class="keyword">struct</span> netEthArpHeader* packet) |
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| 64 | 00055 { |
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| 65 | 00056 <span class="preprocessor"> #ifdef ARP_DEBUG</span> |
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| 66 | 00057 <span class="preprocessor"></span> <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Received ARP Request\r\n"</span>); |
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| 67 | 00058 <a class="code" href="group__arp.html#ga7">arpPrintHeader</a>( &packet->arp ); |
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| 68 | 00059 <span class="preprocessor"> #endif</span> |
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| 69 | 00060 <span class="preprocessor"></span> |
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| 70 | 00061 <span class="comment">// for now, we just reply to requests</span> |
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| 71 | 00062 <span class="comment">// need to add ARP cache</span> |
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| 72 | 00063 <span class="keywordflow">if</span>( (packet->arp.dipaddr == <a class="code" href="group__net.html#ga34">HTONL</a>(ArpMyAddr.ipaddr)) && |
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| 73 | 00064 (packet->arp.opcode == <a class="code" href="group__net.html#ga2">htons</a>(ARP_OPCODE_REQUEST)) ) |
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| 74 | 00065 { |
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| 75 | 00066 <span class="comment">// in ARP header</span> |
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| 76 | 00067 <span class="comment">// copy sender's address info to dest. fields</span> |
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| 77 | 00068 packet->arp.dhwaddr = packet->arp.shwaddr; |
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| 78 | 00069 packet->arp.dipaddr = packet->arp.sipaddr; |
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| 79 | 00070 <span class="comment">// fill in our information</span> |
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| 80 | 00071 packet->arp.shwaddr = ArpMyAddr.ethaddr; |
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| 81 | 00072 packet->arp.sipaddr = <a class="code" href="group__net.html#ga34">HTONL</a>(ArpMyAddr.ipaddr); |
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| 82 | 00073 <span class="comment">// change op to reply</span> |
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| 83 | 00074 packet->arp.opcode = <a class="code" href="group__net.html#ga2">htons</a>(ARP_OPCODE_REPLY); |
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| 84 | 00075 |
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| 85 | 00076 <span class="comment">// in ethernet header</span> |
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| 86 | 00077 packet->eth.dest = packet->eth.src; |
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| 87 | 00078 packet->eth.src = ArpMyAddr.ethaddr; |
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| 88 | 00079 |
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| 89 | 00080 <span class="preprocessor"> #ifdef ARP_DEBUG</span> |
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| 90 | 00081 <span class="preprocessor"></span> <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Sending ARP Reply\r\n"</span>); |
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| 91 | 00082 <a class="code" href="group__arp.html#ga7">arpPrintHeader</a>( &packet->arp ); |
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| 92 | 00083 <span class="preprocessor"> #endif</span> |
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| 93 | 00084 <span class="preprocessor"></span> |
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| 94 | 00085 <span class="comment">// send reply!</span> |
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| 95 | 00086 <a class="code" href="group__nic.html#ga1">nicSend</a>(len, (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span>*)packet); |
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| 96 | 00087 } |
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| 97 | 00088 } |
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| 98 | 00089 |
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| 99 | <a name="l00090"></a><a class="code" href="group__arp.html#ga3">00090</a> <span class="keywordtype">void</span> <a class="code" href="group__arp.html#ga3">arpIpIn</a>(<span class="keyword">struct</span> netEthIpHeader* packet) |
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| 100 | 00091 { |
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| 101 | 00092 int8_t index; |
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| 102 | 00093 |
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| 103 | 00094 <span class="comment">// check if sender is already present in arp table</span> |
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| 104 | 00095 index = <a class="code" href="group__arp.html#ga6">arpMatchIp</a>(<a class="code" href="group__net.html#ga34">HTONL</a>(packet->ip.srcipaddr)); |
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| 105 | 00096 <span class="keywordflow">if</span>(index != -1) |
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| 106 | 00097 { |
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| 107 | 00098 <span class="comment">// sender's IP address found, update ARP entry</span> |
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| 108 | 00099 ArpTable[index].ethaddr = packet->eth.src; |
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| 109 | 00100 <span class="comment">// and we're done</span> |
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| 110 | 00101 <span class="keywordflow">return</span>; |
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| 111 | 00102 } |
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| 112 | 00103 |
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| 113 | 00104 <span class="comment">// sender was not present in table,</span> |
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| 114 | 00105 <span class="comment">// must add in empty/expired slot</span> |
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| 115 | 00106 <span class="keywordflow">for</span>(index=0; index<ARP_TABLE_SIZE; index++) |
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| 116 | 00107 { |
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| 117 | 00108 <span class="keywordflow">if</span>(!ArpTable[index].time) |
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| 118 | 00109 { |
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| 119 | 00110 <span class="comment">// write entry</span> |
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| 120 | 00111 ArpTable[index].ethaddr = packet->eth.src; |
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| 121 | 00112 ArpTable[index].ipaddr = <a class="code" href="group__net.html#ga34">HTONL</a>(packet->ip.srcipaddr); |
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| 122 | 00113 ArpTable[index].time = ARP_CACHE_TIME_TO_LIVE; |
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| 123 | 00114 <span class="comment">// and we're done</span> |
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| 124 | 00115 <span class="keywordflow">return</span>; |
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| 125 | 00116 } |
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| 126 | 00117 } |
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| 127 | 00118 |
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| 128 | 00119 <span class="comment">// no space in table, we give up</span> |
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| 129 | 00120 } |
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| 130 | 00121 |
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| 131 | <a name="l00122"></a><a class="code" href="group__arp.html#ga4">00122</a> <span class="keywordtype">void</span> <a class="code" href="group__arp.html#ga4">arpIpOut</a>(<span class="keyword">struct</span> netEthIpHeader* packet, uint32_t phyDstIp) |
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| 132 | 00123 { |
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| 133 | 00124 <span class="keywordtype">int</span> index; |
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| 134 | 00125 <span class="comment">// check if destination is already present in arp table</span> |
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| 135 | 00126 <span class="comment">// use the physical dstIp if it's provided, otherwise the dstIp in packet</span> |
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| 136 | 00127 <span class="keywordflow">if</span>(phyDstIp) |
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| 137 | 00128 index = <a class="code" href="group__arp.html#ga6">arpMatchIp</a>(phyDstIp); |
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| 138 | 00129 <span class="keywordflow">else</span> |
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| 139 | 00130 index = <a class="code" href="group__arp.html#ga6">arpMatchIp</a>(<a class="code" href="group__net.html#ga34">HTONL</a>(packet->ip.destipaddr)); |
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| 140 | 00131 <span class="comment">// fill in ethernet info</span> |
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| 141 | 00132 <span class="keywordflow">if</span>(index != -1) |
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| 142 | 00133 { |
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| 143 | 00134 <span class="comment">// ARP entry present, fill eth address(es)</span> |
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| 144 | 00135 packet->eth.src = ArpMyAddr.ethaddr; |
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| 145 | 00136 packet->eth.dest = ArpTable[index].ethaddr; |
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| 146 | 00137 packet->eth.type = <a class="code" href="group__net.html#ga33">HTONS</a>(ETHTYPE_IP); |
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| 147 | 00138 } |
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| 148 | 00139 <span class="keywordflow">else</span> |
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| 149 | 00140 { |
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| 150 | 00141 <span class="comment">// not in table, must send ARP request</span> |
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| 151 | 00142 packet->eth.src = ArpMyAddr.ethaddr; |
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| 152 | 00143 <span class="comment">// MUST CHANGE, but for now, send this one broadcast</span> |
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| 153 | 00144 packet->eth.dest.addr[0] = 0xFF; |
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| 154 | 00145 packet->eth.dest.addr[1] = 0xFF; |
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| 155 | 00146 packet->eth.dest.addr[2] = 0xFF; |
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| 156 | 00147 packet->eth.dest.addr[3] = 0xFF; |
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| 157 | 00148 packet->eth.dest.addr[4] = 0xFF; |
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| 158 | 00149 packet->eth.dest.addr[5] = 0xFF; |
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| 159 | 00150 packet->eth.type = <a class="code" href="group__net.html#ga33">HTONS</a>(ETHTYPE_IP); |
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| 160 | 00151 } |
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| 161 | 00152 } |
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| 162 | 00153 |
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| 163 | <a name="l00154"></a><a class="code" href="group__arp.html#ga5">00154</a> <span class="keywordtype">void</span> <a class="code" href="group__arp.html#ga5">arpTimer</a>(<span class="keywordtype">void</span>) |
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| 164 | 00155 { |
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| 165 | 00156 <span class="keywordtype">int</span> index; |
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| 166 | 00157 <span class="comment">// this function meant to be called on a regular time interval</span> |
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| 167 | 00158 |
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| 168 | 00159 <span class="comment">// decrement time-to-live for all entries</span> |
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| 169 | 00160 <span class="keywordflow">for</span>(index=0; index<ARP_TABLE_SIZE; index++) |
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| 170 | 00161 { |
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| 171 | 00162 <span class="keywordflow">if</span>(ArpTable[index].time) |
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| 172 | 00163 ArpTable[index].time--; |
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| 173 | 00164 } |
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| 174 | 00165 } |
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| 175 | 00166 |
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| 176 | <a name="l00167"></a><a class="code" href="group__arp.html#ga6">00167</a> <span class="keywordtype">int</span> <a class="code" href="group__arp.html#ga6">arpMatchIp</a>(uint32_t ipaddr) |
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| 177 | 00168 { |
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| 178 | 00169 uint8_t i; |
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| 179 | 00170 |
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| 180 | 00171 <span class="comment">// check if IP address is present in arp table</span> |
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| 181 | 00172 <span class="keywordflow">for</span>(i=0; i<ARP_TABLE_SIZE; i++) |
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| 182 | 00173 { |
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| 183 | 00174 <span class="keywordflow">if</span>(ArpTable[i].ipaddr == ipaddr) |
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| 184 | 00175 { |
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| 185 | 00176 <span class="comment">// IP address found</span> |
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| 186 | 00177 <span class="keywordflow">return</span> i; |
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| 187 | 00178 } |
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| 188 | 00179 } |
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| 189 | 00180 |
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| 190 | 00181 <span class="comment">// no match</span> |
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| 191 | 00182 <span class="keywordflow">return</span> -1; |
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| 192 | 00183 } |
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| 193 | 00184 |
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| 194 | 00185 <span class="preprocessor">#ifdef ARP_DEBUG_PRINT</span> |
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| 195 | 00186 <span class="preprocessor"></span><span class="keywordtype">void</span> <a class="code" href="group__arp.html#ga7">arpPrintHeader</a>(<span class="keyword">struct</span> netArpHeader* packet) |
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| 196 | 00187 { |
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| 197 | 00188 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"ARP Packet:\r\n"</span>); |
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| 198 | 00189 <span class="comment">//debugPrintHexTable(60, (unsigned char*)&packet);</span> |
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| 199 | 00190 <span class="comment">// print operation type</span> |
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| 200 | 00191 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Operation : "</span>); |
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| 201 | 00192 <span class="keywordflow">if</span>(packet->opcode == <a class="code" href="group__net.html#ga2">htons</a>(ARP_OPCODE_REQUEST)) |
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| 202 | 00193 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"REQUEST"</span>); |
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| 203 | 00194 <span class="keywordflow">else</span> <span class="keywordflow">if</span>(packet->opcode == <a class="code" href="group__net.html#ga2">htons</a>(ARP_OPCODE_REPLY)) |
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| 204 | 00195 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"REPLY"</span>); |
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| 205 | 00196 <span class="keywordflow">else</span> |
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| 206 | 00197 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"UNKNOWN"</span>); |
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| 207 | 00198 <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); |
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| 208 | 00199 <span class="comment">// print source hardware address</span> |
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| 209 | 00200 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"SrcHwAddr : "</span>); <a class="code" href="group__net.html#ga5">netPrintEthAddr</a>(&packet->shwaddr); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); |
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| 210 | 00201 <span class="comment">// print source protocol address</span> |
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| 211 | 00202 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"SrcProtoAddr: "</span>); <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>(); |
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| 212 | 00203 <span class="comment">// print target hardware address</span> |
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| 213 | 00204 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"DstHwAddr : "</span>); <a class="code" href="group__net.html#ga5">netPrintEthAddr</a>(&packet->dhwaddr); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); |
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| 214 | 00205 <span class="comment">// print target protocol address</span> |
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| 215 | 00206 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"DstProtoAddr: "</span>); <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>(); |
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| 216 | 00207 } |
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| 217 | 00208 |
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| 218 | 00209 |
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| 219 | 00210 <span class="keywordtype">void</span> <a class="code" href="group__arp.html#ga8">arpPrintTable</a>(<span class="keywordtype">void</span>) |
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| 220 | 00211 { |
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| 221 | 00212 uint8_t i; |
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| 222 | 00213 |
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| 223 | 00214 <span class="comment">// print ARP table</span> |
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| 224 | 00215 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Time Eth Address IP Address\r\n"</span>); |
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| 225 | 00216 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"---------------------------------------\r\n"</span>); |
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| 226 | 00217 <span class="keywordflow">for</span>(i=0; i<ARP_TABLE_SIZE; i++) |
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| 227 | 00218 { |
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| 228 | 00219 <a class="code" href="group__rprintf.html#ga7">rprintfu08</a>(ArpTable[i].time); |
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| 229 | 00220 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">" "</span>); |
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| 230 | 00221 <a class="code" href="group__net.html#ga5">netPrintEthAddr</a>(&ArpTable[i].ethaddr); |
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| 231 | 00222 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">" "</span>); |
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| 232 | 00223 <a class="code" href="group__net.html#ga6">netPrintIPAddr</a>(ArpTable[i].ipaddr); |
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| 233 | 00224 <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>(); |
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| 234 | 00225 } |
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| 235 | 00226 } |
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| 236 | 00227 <span class="preprocessor">#endif</span> |
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| 237 | </pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:07 2006 for Procyon AVRlib by |
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| 238 | <a href="http://www.doxygen.org/index.html"> |
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| 239 | <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address> |
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| 240 | </body> |
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| 241 | </html> |
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