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add uip git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1125 bbd45198-f89e-11dd-88c7-29a3b14d5316
2010-11-27 00:27:45 +08:00
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<h1>uip/uip-neighbor.c</h1><a href="a00131.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright (c) 2006, Swedish Institute of Computer Science.</span>
<a name="l00003"></a>00003 <span class="comment"> * All rights reserved.</span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00006"></a>00006 <span class="comment"> * modification, are permitted provided that the following conditions</span>
<a name="l00007"></a>00007 <span class="comment"> * are met:</span>
<a name="l00008"></a>00008 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
<a name="l00009"></a>00009 <span class="comment"> * notice, this list of conditions and the following disclaimer.</span>
<a name="l00010"></a>00010 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
<a name="l00011"></a>00011 <span class="comment"> * notice, this list of conditions and the following disclaimer in the</span>
<a name="l00012"></a>00012 <span class="comment"> * documentation and/or other materials provided with the distribution.</span>
<a name="l00013"></a>00013 <span class="comment"> * 3. Neither the name of the Institute nor the names of its contributors</span>
<a name="l00014"></a>00014 <span class="comment"> * may be used to endorse or promote products derived from this software</span>
<a name="l00015"></a>00015 <span class="comment"> * without specific prior written permission.</span>
<a name="l00016"></a>00016 <span class="comment"> *</span>
<a name="l00017"></a>00017 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND</span>
<a name="l00018"></a>00018 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
<a name="l00019"></a>00019 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
<a name="l00020"></a>00020 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE</span>
<a name="l00021"></a>00021 <span class="comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
<a name="l00022"></a>00022 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS</span>
<a name="l00023"></a>00023 <span class="comment"> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</span>
<a name="l00024"></a>00024 <span class="comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span>
<a name="l00025"></a>00025 <span class="comment"> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY</span>
<a name="l00026"></a>00026 <span class="comment"> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF</span>
<a name="l00027"></a>00027 <span class="comment"> * SUCH DAMAGE.</span>
<a name="l00028"></a>00028 <span class="comment"> *</span>
<a name="l00029"></a>00029 <span class="comment"> * This file is part of the uIP TCP/IP stack</span>
<a name="l00030"></a>00030 <span class="comment"> *</span>
<a name="l00031"></a>00031 <span class="comment"> * $Id: uip-neighbor.c,v 1.2 2006/06/12 08:00:30 adam Exp $</span>
<a name="l00032"></a>00032 <span class="comment"> */</span>
<a name="l00033"></a>00033 <span class="comment"></span>
<a name="l00034"></a>00034 <span class="comment">/**</span>
<a name="l00035"></a>00035 <span class="comment"> * \file</span>
<a name="l00036"></a>00036 <span class="comment"> * Database of link-local neighbors, used by IPv6 code and</span>
<a name="l00037"></a>00037 <span class="comment"> * to be used by a future ARP code rewrite.</span>
<a name="l00038"></a>00038 <span class="comment"> * \author</span>
<a name="l00039"></a>00039 <span class="comment"> * Adam Dunkels &lt;adam@sics.se&gt;</span>
<a name="l00040"></a>00040 <span class="comment"> */</span>
<a name="l00041"></a>00041
<a name="l00042"></a>00042 <span class="preprocessor">#include "<a class="code" href="a00132.html">uip-neighbor.h</a>"</span>
<a name="l00043"></a>00043
<a name="l00044"></a>00044 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00045"></a>00045
<a name="l00046"></a><a class="code" href="a00131.html#5320d4457a472d8888ec1905bc0e0a1c">00046</a> <span class="preprocessor">#define MAX_TIME 128</span>
<a name="l00047"></a>00047 <span class="preprocessor"></span>
<a name="l00048"></a>00048 <span class="preprocessor">#ifdef UIP_NEIGHBOR_CONF_ENTRIES</span>
<a name="l00049"></a>00049 <span class="preprocessor"></span><span class="preprocessor">#define ENTRIES UIP_NEIGHBOR_CONF_ENTRIES</span>
<a name="l00050"></a>00050 <span class="preprocessor"></span><span class="preprocessor">#else </span><span class="comment">/* UIP_NEIGHBOR_CONF_ENTRIES */</span>
<a name="l00051"></a><a class="code" href="a00131.html#5f2e1fcf0055d20ce17664b1027bb9eb">00051</a> <span class="preprocessor">#define ENTRIES 8</span>
<a name="l00052"></a>00052 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* UIP_NEIGHBOR_CONF_ENTRIES */</span>
<a name="l00053"></a>00053
<a name="l00054"></a>00054 <span class="keyword">struct </span>neighbor_entry {
<a name="l00055"></a>00055 <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> ipaddr;
<a name="l00056"></a>00056 <span class="keyword">struct </span><a class="code" href="a00092.html">uip_neighbor_addr</a> <a class="code" href="a00092.html#4dc3294d67d705f7248ef57e4259424f">addr</a>;
<a name="l00057"></a>00057 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> time;
<a name="l00058"></a>00058 };
<a name="l00059"></a>00059 <span class="keyword">static</span> <span class="keyword">struct </span>neighbor_entry entries[<a class="code" href="a00131.html#5f2e1fcf0055d20ce17664b1027bb9eb">ENTRIES</a>];
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00062"></a>00062 <span class="keywordtype">void</span>
<a name="l00063"></a><a class="code" href="a00131.html#1273664aba3e6a2a46e87dcb1a5f19ad">00063</a> <a class="code" href="a00132.html#1273664aba3e6a2a46e87dcb1a5f19ad">uip_neighbor_init</a>(<span class="keywordtype">void</span>)
<a name="l00064"></a>00064 {
<a name="l00065"></a>00065 <span class="keywordtype">int</span> i;
<a name="l00066"></a>00066
<a name="l00067"></a>00067 <span class="keywordflow">for</span>(i = 0; i &lt; <a class="code" href="a00131.html#5f2e1fcf0055d20ce17664b1027bb9eb">ENTRIES</a>; ++i) {
<a name="l00068"></a>00068 entries[i].time = <a class="code" href="a00131.html#5320d4457a472d8888ec1905bc0e0a1c">MAX_TIME</a>;
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070 }
<a name="l00071"></a>00071 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00072"></a>00072 <span class="keywordtype">void</span>
<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>
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