a00204.html

uip-1.0,give everyone who want.

<a name="l00094"></a><a class="code" href="a00152.html#g7a7c46ffaba30477b8c9e3e61bd2e106">00094</a> <span class="preprocessor">#define ARP_REQUEST 1</span>
<a name="l00095"></a><a class="code" href="a00152.html#g06ba7b414e718081998f2814090debf1">00095</a> <span class="preprocessor"></span><span class="preprocessor">#define ARP_REPLY   2</span>
<a name="l00096"></a>00096 <span class="preprocessor"></span>
<a name="l00097"></a><a class="code" href="a00152.html#gbb56b549f7ab4d86e1cc39b8afc70d1e">00097</a> <span class="preprocessor">#define ARP_HWTYPE_ETH 1</span>
<a name="l00098"></a>00098 <span class="preprocessor"></span>
<a name="l00099"></a>00099 <span class="keyword">struct </span>arp_entry {
<a name="l00100"></a>00100   <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> ipaddr[2];
<a name="l00101"></a>00101   <span class="keyword">struct </span><a class="code" href="a00089.html">uip_eth_addr</a> ethaddr;
<a name="l00102"></a>00102   <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> time;
<a name="l00103"></a>00103 };
<a name="l00104"></a>00104 
<a name="l00105"></a>00105 <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">struct </span><a class="code" href="a00089.html">uip_eth_addr</a> broadcast_ethaddr =
<a name="l00106"></a>00106   {{0xff,0xff,0xff,0xff,0xff,0xff}};
<a name="l00107"></a>00107 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> broadcast_ipaddr[2] = {0xffff,0xffff};
<a name="l00108"></a>00108 
<a name="l00109"></a>00109 <span class="keyword">static</span> <span class="keyword">struct </span>arp_entry arp_table[<a class="code" href="a00153.html#gb1455b27c06532a399cf06d2c1d6d08d">UIP_ARPTAB_SIZE</a>];
<a name="l00110"></a>00110 <span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> ipaddr[2];
<a name="l00111"></a>00111 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> i, c;
<a name="l00112"></a>00112 
<a name="l00113"></a>00113 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> arptime;
<a name="l00114"></a>00114 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> tmpage;
<a name="l00115"></a>00115 
<a name="l00116"></a><a class="code" href="a00152.html#g24f52ac52d6e714cb04a5aa01be3bdd0">00116</a> <span class="preprocessor">#define BUF   ((struct arp_hdr *)&amp;uip_buf[0])</span>
<a name="l00117"></a><a class="code" href="a00152.html#g9f2196e2705036869611962425e404bf">00117</a> <span class="preprocessor"></span><span class="preprocessor">#define IPBUF ((struct ethip_hdr *)&amp;uip_buf[0])</span>
<a name="l00118"></a>00118 <span class="preprocessor"></span><span class="comment">/*-----------------------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00119"></a>00119 <span class="comment">/**</span>
<a name="l00120"></a>00120 <span class="comment"> * Initialize the ARP module.</span>
<a name="l00121"></a>00121 <span class="comment"> *</span>
<a name="l00122"></a>00122 <span class="comment"> */</span>
<a name="l00123"></a>00123 <span class="comment">/*-----------------------------------------------------------------------------------*/</span>
<a name="l00124"></a>00124 <span class="keywordtype">void</span>
<a name="l00125"></a><a class="code" href="a00152.html#g2d9d28afa353f662b9bb5234fc419f72">00125</a> <a class="code" href="a00152.html#g2d9d28afa353f662b9bb5234fc419f72">uip_arp_init</a>(<span class="keywordtype">void</span>)
<a name="l00126"></a>00126 {
<a name="l00127"></a>00127   <span class="keywordflow">for</span>(i = 0; i &lt; <a class="code" href="a00153.html#gb1455b27c06532a399cf06d2c1d6d08d">UIP_ARPTAB_SIZE</a>; ++i) {
<a name="l00128"></a>00128     memset(arp_table[i].ipaddr, 0, 4);
<a name="l00129"></a>00129   }
<a name="l00130"></a>00130 }
<a name="l00131"></a>00131 <span class="comment">/*-----------------------------------------------------------------------------------*/</span><span class="comment"></span>
<a name="l00132"></a>00132 <span class="comment">/**</span>
<a name="l00133"></a>00133 <span class="comment"> * Periodic ARP processing function.</span>
<a name="l00134"></a>00134 <span class="comment"> *</span>
<a name="l00135"></a>00135 <span class="comment"> * This function performs periodic timer processing in the ARP module</span>
<a name="l00136"></a>00136 <span class="comment"> * and should be called at regular intervals. The recommended interval</span>
<a name="l00137"></a>00137 <span class="comment"> * is 10 seconds between the calls.</span>
<a name="l00138"></a>00138 <span class="comment"> *</span>
<a name="l00139"></a>00139 <span class="comment"> */</span>
<a name="l00140"></a>00140 <span class="comment">/*-----------------------------------------------------------------------------------*/</span>
<a name="l00141"></a>00141 <span class="keywordtype">void</span>
<a name="l00142"></a><a class="code" href="a00152.html#g058a8e6025f67b021862281f1911fcef">00142</a> <a class="code" href="a00152.html#g058a8e6025f67b021862281f1911fcef">uip_arp_timer</a>(<span class="keywordtype">void</span>)
<a name="l00143"></a>00143 {
<a name="l00144"></a>00144   <span class="keyword">struct </span>arp_entry *tabptr;
<a name="l00145"></a>00145   
<a name="l00146"></a>00146   ++arptime;
<a name="l00147"></a>00147   <span class="keywordflow">for</span>(i = 0; i &lt; <a class="code" href="a00153.html#gb1455b27c06532a399cf06d2c1d6d08d">UIP_ARPTAB_SIZE</a>; ++i) {
<a name="l00148"></a>00148     tabptr = &amp;arp_table[i];
<a name="l00149"></a>00149     <span class="keywordflow">if</span>((tabptr-&gt;ipaddr[0] | tabptr-&gt;ipaddr[1]) != 0 &amp;&amp;
<a name="l00150"></a>00150        arptime - tabptr-&gt;time &gt;= <a class="code" href="a00153.html#g3090117ef3ff5775b77cb1960e442d07">UIP_ARP_MAXAGE</a>) {
<a name="l00151"></a>00151       memset(tabptr-&gt;ipaddr, 0, 4);
<a name="l00152"></a>00152     }
<a name="l00153"></a>00153   }
<a name="l00154"></a>00154 
<a name="l00155"></a>00155 }
<a name="l00156"></a>00156 <span class="comment">/*-----------------------------------------------------------------------------------*/</span>
<a name="l00157"></a>00157 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00158"></a>00158 uip_arp_update(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> *ipaddr, <span class="keyword">struct</span> <a class="code" href="a00089.html">uip_eth_addr</a> *ethaddr)
<a name="l00159"></a>00159 {
<a name="l00160"></a>00160   <span class="keyword">register</span> <span class="keyword">struct </span>arp_entry *tabptr;
<a name="l00161"></a>00161   <span class="comment">/* Walk through the ARP mapping table and try to find an entry to</span>
<a name="l00162"></a>00162 <span class="comment">     update. If none is found, the IP -&gt; MAC address mapping is</span>
<a name="l00163"></a>00163 <span class="comment">     inserted in the ARP table. */</span>
<a name="l00164"></a>00164   <span class="keywordflow">for</span>(i = 0; i &lt; <a class="code" href="a00153.html#gb1455b27c06532a399cf06d2c1d6d08d">UIP_ARPTAB_SIZE</a>; ++i) {
<a name="l00165"></a>00165 
<a name="l00166"></a>00166     tabptr = &amp;arp_table[i];
<a name="l00167"></a>00167     <span class="comment">/* Only check those entries that are actually in use. */</span>
<a name="l00168"></a>00168     <span class="keywordflow">if</span>(tabptr-&gt;ipaddr[0] != 0 &amp;&amp;
<a name="l00169"></a>00169        tabptr-&gt;ipaddr[1] != 0) {
<a name="l00170"></a>00170 
<a name="l00171"></a>00171       <span class="comment">/* Check if the source IP address of the incoming packet matches</span>
<a name="l00172"></a>00172 <span class="comment">         the IP address in this ARP table entry. */</span>
<a name="l00173"></a>00173       <span class="keywordflow">if</span>(ipaddr[0] == tabptr-&gt;ipaddr[0] &amp;&amp;
<a name="l00174"></a>00174          ipaddr[1] == tabptr-&gt;ipaddr[1]) {
<a name="l00175"></a>00175          
<a name="l00176"></a>00176         <span class="comment">/* An old entry found, update this and return. */</span>
<a name="l00177"></a>00177         memcpy(tabptr-&gt;ethaddr.addr, ethaddr-&gt;<a class="code" href="a00089.html#aacd5fa1806e0f0dd0bc96dd36507ad8">addr</a>, 6);
<a name="l00178"></a>00178         tabptr-&gt;time = arptime;
<a name="l00179"></a>00179 
<a name="l00180"></a>00180         <span class="keywordflow">return</span>;
<a name="l00181"></a>00181       }
<a name="l00182"></a>00182     }
<a name="l00183"></a>00183   }
<a name="l00184"></a>00184 
<a name="l00185"></a>00185   <span class="comment">/* If we get here, no existing ARP table entry was found, so we</span>
<a name="l00186"></a>00186 <span class="comment">     create one. */</span>
<a name="l00187"></a>00187 
<a name="l00188"></a>00188   <span class="comment">/* First, we try to find an unused entry in the ARP table. */</span>
<a name="l00189"></a>00189   <span class="keywordflow">for</span>(i = 0; i &lt; <a class="code" href="a00153.html#gb1455b27c06532a399cf06d2c1d6d08d">UIP_ARPTAB_SIZE</a>; ++i) {
<a name="l00190"></a>00190     tabptr = &amp;arp_table[i];
<a name="l00191"></a>00191     <span class="keywordflow">if</span>(tabptr-&gt;ipaddr[0] == 0 &amp;&amp;
<a name="l00192"></a>00192        tabptr-&gt;ipaddr[1] == 0) {
<a name="l00193"></a>00193       <span class="keywordflow">break</span>;
<a name="l00194"></a>00194     }
<a name="l00195"></a>00195   }
<a name="l00196"></a>00196 
<a name="l00197"></a>00197   <span class="comment">/* If no unused entry is found, we try to find the oldest entry and</span>
<a name="l00198"></a>00198 <span class="comment">     throw it away. */</span>
<a name="l00199"></a>00199   <span class="keywordflow">if</span>(i == <a class="code" href="a00153.html#gb1455b27c06532a399cf06d2c1d6d08d">UIP_ARPTAB_SIZE</a>) {
<a name="l00200"></a>00200     tmpage = 0;
<a name="l00201"></a>00201     c = 0;
<a name="l00202"></a>00202     <span class="keywordflow">for</span>(i = 0; i &lt; <a class="code" href="a00153.html#gb1455b27c06532a399cf06d2c1d6d08d">UIP_ARPTAB_SIZE</a>; ++i) {
<a name="l00203"></a>00203       tabptr = &amp;arp_table[i];
<a name="l00204"></a>00204       <span class="keywordflow">if</span>(arptime - tabptr-&gt;time &gt; tmpage) {
<a name="l00205"></a>00205         tmpage = arptime - tabptr-&gt;time;
<a name="l00206"></a>00206         c = i;