a00197.html

UIP完整的协议栈

<a name="l00073"></a><a class="code" href="a00131.html#890e822616a6839dfbf51dcb591b8e99">00073</a> <a class="code" href="a00132.html#890e822616a6839dfbf51dcb591b8e99">uip_neighbor_periodic</a>(<span class="keywordtype">void</span>)
<a name="l00074"></a>00074 {
<a name="l00075"></a>00075   <span class="keywordtype">int</span> i;
<a name="l00076"></a>00076 
<a name="l00077"></a>00077   <span class="keywordflow">for</span>(i = 0; i &lt; <a class="code" href="a00131.html#5f2e1fcf0055d20ce17664b1027bb9eb">ENTRIES</a>; ++i) {
<a name="l00078"></a>00078     <span class="keywordflow">if</span>(entries[i].time &lt; <a class="code" href="a00131.html#5320d4457a472d8888ec1905bc0e0a1c">MAX_TIME</a>) {
<a name="l00079"></a>00079       entries[i].time++;
<a name="l00080"></a>00080     }
<a name="l00081"></a>00081   }
<a name="l00082"></a>00082 }
<a name="l00083"></a>00083 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00084"></a>00084 <span class="keywordtype">void</span>
<a name="l00085"></a><a class="code" href="a00131.html#88460bea09a462d0e22511cb567eee14">00085</a> <a class="code" href="a00132.html#88460bea09a462d0e22511cb567eee14">uip_neighbor_add</a>(<a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> ipaddr, <span class="keyword">struct</span> <a class="code" href="a00092.html">uip_neighbor_addr</a> *addr)
<a name="l00086"></a>00086 {
<a name="l00087"></a>00087   <span class="keywordtype">int</span> i, oldest;
<a name="l00088"></a>00088   <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> oldest_time;
<a name="l00089"></a>00089 
<a name="l00090"></a>00090   printf(<span class="stringliteral">"Adding neighbor with link address %02x:%02x:%02x:%02x:%02x:%02x\n"</span>,
<a name="l00091"></a>00091          addr-&gt;<a class="code" href="a00092.html#4dc3294d67d705f7248ef57e4259424f">addr</a>.<a class="code" href="a00089.html#aacd5fa1806e0f0dd0bc96dd36507ad8">addr</a>[0], addr-&gt;<a class="code" href="a00092.html#4dc3294d67d705f7248ef57e4259424f">addr</a>.<a class="code" href="a00089.html#aacd5fa1806e0f0dd0bc96dd36507ad8">addr</a>[1], addr-&gt;<a class="code" href="a00092.html#4dc3294d67d705f7248ef57e4259424f">addr</a>.<a class="code" href="a00089.html#aacd5fa1806e0f0dd0bc96dd36507ad8">addr</a>[2], addr-&gt;<a class="code" href="a00092.html#4dc3294d67d705f7248ef57e4259424f">addr</a>.<a class="code" href="a00089.html#aacd5fa1806e0f0dd0bc96dd36507ad8">addr</a>[3],
<a name="l00092"></a>00092          addr-&gt;<a class="code" href="a00092.html#4dc3294d67d705f7248ef57e4259424f">addr</a>.<a class="code" href="a00089.html#aacd5fa1806e0f0dd0bc96dd36507ad8">addr</a>[4], addr-&gt;<a class="code" href="a00092.html#4dc3294d67d705f7248ef57e4259424f">addr</a>.<a class="code" href="a00089.html#aacd5fa1806e0f0dd0bc96dd36507ad8">addr</a>[5]);
<a name="l00093"></a>00093   
<a name="l00094"></a>00094   <span class="comment">/* Find the first unused entry or the oldest used entry. */</span>
<a name="l00095"></a>00095   oldest_time = 0;
<a name="l00096"></a>00096   oldest = 0;
<a name="l00097"></a>00097   <span class="keywordflow">for</span>(i = 0; i &lt; <a class="code" href="a00131.html#5f2e1fcf0055d20ce17664b1027bb9eb">ENTRIES</a>; ++i) {
<a name="l00098"></a>00098     <span class="keywordflow">if</span>(entries[i].time == <a class="code" href="a00131.html#5320d4457a472d8888ec1905bc0e0a1c">MAX_TIME</a>) {
<a name="l00099"></a>00099       oldest = i;
<a name="l00100"></a>00100       <span class="keywordflow">break</span>;
<a name="l00101"></a>00101     }
<a name="l00102"></a>00102     <span class="keywordflow">if</span>(<a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(entries[i].ipaddr, addr)) {
<a name="l00103"></a>00103       oldest = i;
<a name="l00104"></a>00104       <span class="keywordflow">break</span>;
<a name="l00105"></a>00105     }
<a name="l00106"></a>00106     <span class="keywordflow">if</span>(entries[i].time &gt; oldest_time) {
<a name="l00107"></a>00107       oldest = i;
<a name="l00108"></a>00108       oldest_time = entries[i].time;
<a name="l00109"></a>00109     }
<a name="l00110"></a>00110   }
<a name="l00111"></a>00111 
<a name="l00112"></a>00112   <span class="comment">/* Use the oldest or first free entry (either pointed to by the</span>
<a name="l00113"></a>00113 <span class="comment">     "oldest" variable). */</span>
<a name="l00114"></a>00114   entries[oldest].time = 0;
<a name="l00115"></a>00115   <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(entries[oldest].ipaddr, ipaddr);
<a name="l00116"></a>00116   memcpy(&amp;entries[oldest].addr, addr, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="a00092.html">uip_neighbor_addr</a>));
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00119"></a>00119 <span class="keyword">static</span> <span class="keyword">struct </span>neighbor_entry *
<a name="l00120"></a>00120 find_entry(<a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> ipaddr)
<a name="l00121"></a>00121 {
<a name="l00122"></a>00122   <span class="keywordtype">int</span> i;
<a name="l00123"></a>00123   
<a name="l00124"></a>00124   <span class="keywordflow">for</span>(i = 0; i &lt; <a class="code" href="a00131.html#5f2e1fcf0055d20ce17664b1027bb9eb">ENTRIES</a>; ++i) {
<a name="l00125"></a>00125     <span class="keywordflow">if</span>(<a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(entries[i].ipaddr, ipaddr)) {
<a name="l00126"></a>00126       <span class="keywordflow">return</span> &amp;entries[i];
<a name="l00127"></a>00127     }
<a name="l00128"></a>00128   }
<a name="l00129"></a>00129   <span class="keywordflow">return</span> <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00130"></a>00130 }
<a name="l00131"></a>00131 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00132"></a>00132 <span class="keywordtype">void</span>
<a name="l00133"></a><a class="code" href="a00131.html#1d5ce7047650f3ecee0814dbc8714099">00133</a> <a class="code" href="a00132.html#1d5ce7047650f3ecee0814dbc8714099">uip_neighbor_update</a>(<a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> ipaddr)
<a name="l00134"></a>00134 {
<a name="l00135"></a>00135   <span class="keyword">struct </span>neighbor_entry *e;
<a name="l00136"></a>00136 
<a name="l00137"></a>00137   e = find_entry(ipaddr);
<a name="l00138"></a>00138   <span class="keywordflow">if</span>(e != <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00139"></a>00139     e-&gt;time = 0;
<a name="l00140"></a>00140   }
<a name="l00141"></a>00141 }
<a name="l00142"></a>00142 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00143"></a>00143 <span class="keyword">struct </span><a class="code" href="a00092.html">uip_neighbor_addr</a> *
<a name="l00144"></a><a class="code" href="a00131.html#692d80636342d564422ccd9296ad568d">00144</a> <a class="code" href="a00132.html#692d80636342d564422ccd9296ad568d">uip_neighbor_lookup</a>(<a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> ipaddr)
<a name="l00145"></a>00145 {
<a name="l00146"></a>00146   <span class="keyword">struct </span>neighbor_entry *e;
<a name="l00147"></a>00147 
<a name="l00148"></a>00148   e = find_entry(ipaddr);
<a name="l00149"></a>00149   <span class="keywordflow">if</span>(e != <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00150"></a>00150     <span class="comment">/*    printf("Lookup neighbor with link address %02x:%02x:%02x:%02x:%02x:%02x\n",</span>
<a name="l00151"></a>00151 <span class="comment">           e-&gt;addr.addr.addr[0], e-&gt;addr.addr.addr[1], e-&gt;addr.addr.addr[2], e-&gt;addr.addr.addr[3],</span>
<a name="l00152"></a>00152 <span class="comment">           e-&gt;addr.addr.addr[4], e-&gt;addr.addr.addr[5]);*/</span>
<a name="l00153"></a>00153 
<a name="l00154"></a>00154     <span class="keywordflow">return</span> &amp;e-&gt;addr;
<a name="l00155"></a>00155   }
<a name="l00156"></a>00156   <span class="keywordflow">return</span> <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158 <span class="comment">/*---------------------------------------------------------------------------*/</span>
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Jun 12 10:23:01 2006 for uIP 1.0 by&nbsp;
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<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address>
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