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10 <li><a href="main.html"><span>Main Page</span></a></li>
11 <li><a href="modules.html"><span>Modules</span></a></li>
12 <li><a href="classes.html"><span>Data Structures</span></a></li>
13 <li id="current"><a href="files.html"><span>Files</span></a></li>
14 <li><a href="examples.html"><span>Examples</span></a></li>
18 <li><a href="files.html"><span>File List</span></a></li>
19 <li><a href="globals.html"><span>Globals</span></a></li>
21 …p_arp.c</h1><a href="a00138.html">Go to the documentation of this file.</a><div class="fragment"><…
22 <a name="l00002"></a>00002 <span class="comment"> * \addtogroup uip</span>
23 <a name="l00003"></a>00003 <span class="comment"> * @{</span>
24 <a name="l00004"></a>00004 <span class="comment"> */</span>
25 <a name="l00005"></a>00005 <span class="comment"></span>
26 <a name="l00006"></a>00006 <span class="comment">/**</span>
27 <a name="l00007"></a>00007 <span class="comment"> * \defgroup uiparp uIP Address Resolution Protoco…
28 <a name="l00008"></a>00008 <span class="comment"> * @{</span>
29 <a name="l00009"></a>00009 <span class="comment"> *</span>
30 <a name="l00010"></a>00010 <span class="comment"> * The Address Resolution Protocol ARP is used for…
31 <a name="l00011"></a>00011 <span class="comment"> * addresses and link level addresses such as the …
32 <a name="l00012"></a>00012 <span class="comment"> * addresses. ARP uses broadcast queries to ask fo…
33 <a name="l00013"></a>00013 <span class="comment"> * address of a known IP address and the host whic…
34 <a name="l00014"></a>00014 <span class="comment"> * the IP address for which the query was meant, w…
35 <a name="l00015"></a>00015 <span class="comment"> * link level address.</span>
36 <a name="l00016"></a>00016 <span class="comment"> *</span>
37 <a name="l00017"></a>00017 <span class="comment"> * \note This ARP implementation only supports Eth…
38 <a name="l00018"></a>00018 <span class="comment"> */</span>
39 <a name="l00019"></a>00019 <span class="comment"></span>
40 <a name="l00020"></a>00020 <span class="comment">/**</span>
41 <a name="l00021"></a>00021 <span class="comment"> * \file</span>
42 <a name="l00022"></a>00022 <span class="comment"> * Implementation of the ARP Address Resolution Pr…
43 <a name="l00023"></a>00023 <span class="comment"> * \author Adam Dunkels <[email protected]></…
44 <a name="l00024"></a>00024 <span class="comment"> *</span>
45 <a name="l00025"></a>00025 <span class="comment"> */</span>
46 <a name="l00026"></a>00026
47 <a name="l00027"></a>00027 <span class="comment">/*</span>
48 <a name="l00028"></a>00028 <span class="comment"> * Copyright (c) 2001-2003, Adam Dunkels.</span>
49 <a name="l00029"></a>00029 <span class="comment"> * All rights reserved.</span>
50 <a name="l00030"></a>00030 <span class="comment"> *</span>
51 <a name="l00031"></a>00031 <span class="comment"> * Redistribution and use in source and binary for…
52 <a name="l00032"></a>00032 <span class="comment"> * modification, are permitted provided that the f…
53 <a name="l00033"></a>00033 <span class="comment"> * are met:</span>
54 <a name="l00034"></a>00034 <span class="comment"> * 1. Redistributions of source code must retain t…
55 <a name="l00035"></a>00035 <span class="comment"> * notice, this list of conditions and the foll…
56 <a name="l00036"></a>00036 <span class="comment"> * 2. Redistributions in binary form must reproduc…
57 <a name="l00037"></a>00037 <span class="comment"> * notice, this list of conditions and the foll…
58 <a name="l00038"></a>00038 <span class="comment"> * documentation and/or other materials provide…
59 <a name="l00039"></a>00039 <span class="comment"> * 3. The name of the author may not be used to en…
60 <a name="l00040"></a>00040 <span class="comment"> * products derived from this software without …
61 <a name="l00041"></a>00041 <span class="comment"> * written permission.</span>
62 <a name="l00042"></a>00042 <span class="comment"> *</span>
63 <a name="l00043"></a>00043 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS…
64 <a name="l00044"></a>00044 <span class="comment"> * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMIT…
65 <a name="l00045"></a>00045 <span class="comment"> * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A…
66 <a name="l00046"></a>00046 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR B…
67 <a name="l00047"></a>00047 <span class="comment"> * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLAR…
68 <a name="l00048"></a>00048 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCURE…
69 <a name="l00049"></a>00049 <span class="comment"> * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFIT…
70 <a name="l00050"></a>00050 <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY …
71 <a name="l00051"></a>00051 <span class="comment"> * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT …
72 <a name="l00052"></a>00052 <span class="comment"> * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT…
73 <a name="l00053"></a>00053 <span class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF…
74 <a name="l00054"></a>00054 <span class="comment"> *</span>
75 <a name="l00055"></a>00055 <span class="comment"> * This file is part of the uIP TCP/IP stack.</spa…
76 <a name="l00056"></a>00056 <span class="comment"> *</span>
77 <a name="l00057"></a>00057 <span class="comment"> * $Id: uip_arp.c,v 1.8 2006/06/02 23:36:21 adam E…
78 <a name="l00058"></a>00058 <span class="comment"> *</span>
79 <a name="l00059"></a>00059 <span class="comment"> */</span>
80 <a name="l00060"></a>00060
81 <a name="l00061"></a>00061
82 <a name="l00062"></a>00062 <span class="preprocessor">#include "<a class="code" href="a00139.html">…
83 <a name="l00063"></a>00063
84 <a name="l00064"></a>00064 <span class="preprocessor">#include <string.h></span>
85 <a name="l00065"></a>00065
86 <a name="l00066"></a>00066 <span class="keyword">struct </span>arp_hdr {
87 <a name="l00067"></a>00067 <span class="keyword">struct </span><a class="code" href="a00090.html"…
88 <a name="l00068"></a>00068 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
89 <a name="l00069"></a>00069 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
90 <a name="l00070"></a>00070 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u…
91 <a name="l00071"></a>00071 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u…
92 <a name="l00072"></a>00072 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
93 <a name="l00073"></a>00073 <span class="keyword">struct </span><a class="code" href="a00089.html"…
94 <a name="l00074"></a>00074 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
95 <a name="l00075"></a>00075 <span class="keyword">struct </span><a class="code" href="a00089.html"…
96 <a name="l00076"></a>00076 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
97 <a name="l00077"></a>00077 };
98 <a name="l00078"></a>00078
99 <a name="l00079"></a>00079 <span class="keyword">struct </span>ethip_hdr {
100 <a name="l00080"></a>00080 <span class="keyword">struct </span><a class="code" href="a00090.html"…
101 <a name="l00081"></a>00081 <span class="comment">/* IP header. */</span>
102 <a name="l00082"></a>00082 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u…
103 <a name="l00083"></a>00083 tos,
104 <a name="l00084"></a>00084 len[2],
105 <a name="l00085"></a>00085 ipid[2],
106 <a name="l00086"></a>00086 ipoffset[2],
107 <a name="l00087"></a>00087 ttl,
108 <a name="l00088"></a>00088 proto;
109 <a name="l00089"></a>00089 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
110 <a name="l00090"></a>00090 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
111 <a name="l00091"></a>00091 destipaddr[2];
112 <a name="l00092"></a>00092 };
113 <a name="l00093"></a>00093
114 <a name="l00094"></a><a class="code" href="a00152.html#g7a7c46ffaba30477b8c9e3e61bd2e106">00094</a>…
115 <a name="l00095"></a><a class="code" href="a00152.html#g06ba7b414e718081998f2814090debf1">00095</a>…
116 <a name="l00096"></a>00096 <span class="preprocessor"></span>
117 <a name="l00097"></a><a class="code" href="a00152.html#gbb56b549f7ab4d86e1cc39b8afc70d1e">00097</a>…
118 <a name="l00098"></a>00098 <span class="preprocessor"></span>
119 <a name="l00099"></a>00099 <span class="keyword">struct </span>arp_entry {
120 <a name="l00100"></a>00100 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
121 <a name="l00101"></a>00101 <span class="keyword">struct </span><a class="code" href="a00089.html"…
122 <a name="l00102"></a>00102 <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u…
123 <a name="l00103"></a>00103 };
124 <a name="l00104"></a>00104
125 …a name="l00105"></a>00105 <span class="keyword">static</span> <span class="keyword">const</span> <…
126 <a name="l00106"></a>00106 {{0xff,0xff,0xff,0xff,0xff,0xff}};
127 …a name="l00107"></a>00107 <span class="keyword">static</span> <span class="keyword">const</span> <…
128 <a name="l00108"></a>00108
129 …a name="l00109"></a>00109 <span class="keyword">static</span> <span class="keyword">struct </span>…
130 <a name="l00110"></a>00110 <span class="keyword">static</span> <a class="code" href="a00153.html#g7…
131 <a name="l00111"></a>00111 <span class="keyword">static</span> <a class="code" href="a00153.html#g4…
132 <a name="l00112"></a>00112
133 <a name="l00113"></a>00113 <span class="keyword">static</span> <a class="code" href="a00153.html#g4…
134 <a name="l00114"></a>00114 <span class="keyword">static</span> <a class="code" href="a00153.html#g4…
135 <a name="l00115"></a>00115
136 <a name="l00116"></a><a class="code" href="a00152.html#g24f52ac52d6e714cb04a5aa01be3bdd0">00116</a>…
137 <a name="l00117"></a><a class="code" href="a00152.html#g9f2196e2705036869611962425e404bf">00117</a>…
138 <a name="l00118"></a>00118 <span class="preprocessor"></span><span class="comment">/*--------------…
139 <a name="l00119"></a>00119 <span class="comment">/**</span>
140 <a name="l00120"></a>00120 <span class="comment"> * Initialize the ARP module.</span>
141 <a name="l00121"></a>00121 <span class="comment"> *</span>
142 <a name="l00122"></a>00122 <span class="comment"> */</span>
143 <a name="l00123"></a>00123 <span class="comment">/*------------------------------------------------…
144 <a name="l00124"></a>00124 <span class="keywordtype">void</span>
145 …a name="l00125"></a><a class="code" href="a00152.html#g2d9d28afa353f662b9bb5234fc419f72">00125</a>…
146 <a name="l00126"></a>00126 {
147 …a name="l00127"></a>00127 <span class="keywordflow">for</span>(i = 0; i < <a class="code" hre…
148 <a name="l00128"></a>00128 memset(arp_table[i].ipaddr, 0, 4);
149 <a name="l00129"></a>00129 }
150 <a name="l00130"></a>00130 }
151 <a name="l00131"></a>00131 <span class="comment">/*------------------------------------------------…
152 <a name="l00132"></a>00132 <span class="comment">/**</span>
153 <a name="l00133"></a>00133 <span class="comment"> * Periodic ARP processing function.</span>
154 <a name="l00134"></a>00134 <span class="comment"> *</span>
155 <a name="l00135"></a>00135 <span class="comment"> * This function performs periodic timer processin…
156 <a name="l00136"></a>00136 <span class="comment"> * and should be called at regular intervals. The …
157 <a name="l00137"></a>00137 <span class="comment"> * is 10 seconds between the calls.</span>
158 <a name="l00138"></a>00138 <span class="comment"> *</span>
159 <a name="l00139"></a>00139 <span class="comment"> */</span>
160 <a name="l00140"></a>00140 <span class="comment">/*------------------------------------------------…
161 <a name="l00141"></a>00141 <span class="keywordtype">void</span>
162 …a name="l00142"></a><a class="code" href="a00152.html#g058a8e6025f67b021862281f1911fcef">00142</a>…
163 <a name="l00143"></a>00143 {
164 <a name="l00144"></a>00144 <span class="keyword">struct </span>arp_entry *tabptr;
165 <a name="l00145"></a>00145
166 <a name="l00146"></a>00146 ++arptime;
167 …a name="l00147"></a>00147 <span class="keywordflow">for</span>(i = 0; i < <a class="code" hre…
168 <a name="l00148"></a>00148 tabptr = &arp_table[i];
169 <a name="l00149"></a>00149 <span class="keywordflow">if</span>((tabptr->ipaddr[0] | tabptr-&…
170 <a name="l00150"></a>00150 arptime - tabptr->time >= <a class="code" href="a00153.html…
171 <a name="l00151"></a>00151 memset(tabptr->ipaddr, 0, 4);
172 <a name="l00152"></a>00152 }
173 <a name="l00153"></a>00153 }
174 <a name="l00154"></a>00154
175 <a name="l00155"></a>00155 }
176 <a name="l00156"></a>00156 <span class="comment">/*------------------------------------------------…
177 <a name="l00157"></a>00157 <span class="keyword">static</span> <span class="keywordtype">void</span>
178 …a name="l00158"></a>00158 uip_arp_update(<a class="code" href="a00153.html#g77570ac4fcab86864fa191…
179 <a name="l00159"></a>00159 {
180 <a name="l00160"></a>00160 <span class="keyword">register</span> <span class="keyword">struct </s…
181 <a name="l00161"></a>00161 <span class="comment">/* Walk through the ARP mapping table and try to…
182 <a name="l00162"></a>00162 <span class="comment"> update. If none is found, the IP -> MAC ad…
183 <a name="l00163"></a>00163 <span class="comment"> inserted in the ARP table. */</span>
184 …a name="l00164"></a>00164 <span class="keywordflow">for</span>(i = 0; i < <a class="code" hre…
185 <a name="l00165"></a>00165
186 <a name="l00166"></a>00166 tabptr = &arp_table[i];
187 <a name="l00167"></a>00167 <span class="comment">/* Only check those entries that are actually …
188 <a name="l00168"></a>00168 <span class="keywordflow">if</span>(tabptr->ipaddr[0] != 0 &&…
189 <a name="l00169"></a>00169 tabptr->ipaddr[1] != 0) {
190 <a name="l00170"></a>00170
191 <a name="l00171"></a>00171 <span class="comment">/* Check if the source IP address of the inc…
192 <a name="l00172"></a>00172 <span class="comment"> the IP address in this ARP table entry. *…
193 <a name="l00173"></a>00173 <span class="keywordflow">if</span>(ipaddr[0] == tabptr->ipaddr…
194 <a name="l00174"></a>00174 ipaddr[1] == tabptr->ipaddr[1]) {
195 <a name="l00175"></a>00175
196 <a name="l00176"></a>00176 <span class="comment">/* An old entry found, update this and ret…
197 …a name="l00177"></a>00177 memcpy(tabptr->ethaddr.addr, ethaddr-><a class="code" href…
198 <a name="l00178"></a>00178 tabptr->time = arptime;
199 <a name="l00179"></a>00179
200 <a name="l00180"></a>00180 <span class="keywordflow">return</span>;
201 <a name="l00181"></a>00181 }
202 <a name="l00182"></a>00182 }
203 <a name="l00183"></a>00183 }
204 <a name="l00184"></a>00184
205 <a name="l00185"></a>00185 <span class="comment">/* If we get here, no existing ARP table entry w…
206 <a name="l00186"></a>00186 <span class="comment"> create one. */</span>
207 <a name="l00187"></a>00187
208 <a name="l00188"></a>00188 <span class="comment">/* First, we try to find an unused entry in the …
209 …a name="l00189"></a>00189 <span class="keywordflow">for</span>(i = 0; i < <a class="code" hre…
210 <a name="l00190"></a>00190 tabptr = &arp_table[i];
211 <a name="l00191"></a>00191 <span class="keywordflow">if</span>(tabptr->ipaddr[0] == 0 &&…
212 <a name="l00192"></a>00192 tabptr->ipaddr[1] == 0) {
213 <a name="l00193"></a>00193 <span class="keywordflow">break</span>;
214 <a name="l00194"></a>00194 }
215 <a name="l00195"></a>00195 }
216 <a name="l00196"></a>00196
217 <a name="l00197"></a>00197 <span class="comment">/* If no unused entry is found, we try to find t…
218 <a name="l00198"></a>00198 <span class="comment"> throw it away. */</span>
219 …a name="l00199"></a>00199 <span class="keywordflow">if</span>(i == <a class="code" href="a00153.…
220 <a name="l00200"></a>00200 tmpage = 0;
221 <a name="l00201"></a>00201 c = 0;
222 …a name="l00202"></a>00202 <span class="keywordflow">for</span>(i = 0; i < <a class="code" h…
223 <a name="l00203"></a>00203 tabptr = &arp_table[i];
224 <a name="l00204"></a>00204 <span class="keywordflow">if</span>(arptime - tabptr->time >…
225 <a name="l00205"></a>00205 tmpage = arptime - tabptr->time;
226 <a name="l00206"></a>00206 c = i;
227 <a name="l00207"></a>00207 }
228 <a name="l00208"></a>00208 }
229 <a name="l00209"></a>00209 i = c;
230 <a name="l00210"></a>00210 tabptr = &arp_table[i];
231 <a name="l00211"></a>00211 }
232 <a name="l00212"></a>00212
233 <a name="l00213"></a>00213 <span class="comment">/* Now, i is the ARP table entry which we will f…
234 <a name="l00214"></a>00214 <span class="comment"> information. */</span>
235 <a name="l00215"></a>00215 memcpy(tabptr->ipaddr, ipaddr, 4);
236 <a name="l00216"></a>00216 memcpy(tabptr->ethaddr.addr, ethaddr-><a class="code" href="a000…
237 <a name="l00217"></a>00217 tabptr->time = arptime;
238 <a name="l00218"></a>00218 }
239 <a name="l00219"></a>00219 <span class="comment">/*------------------------------------------------…
240 <a name="l00220"></a>00220 <span class="comment">/**</span>
241 <a name="l00221"></a>00221 <span class="comment"> * ARP processing for incoming IP packets</span>
242 <a name="l00222"></a>00222 <span class="comment"> *</span>
243 <a name="l00223"></a>00223 <span class="comment"> * This function should be called by the device dr…
244 <a name="l00224"></a>00224 <span class="comment"> * packet has been received. The function will che…
245 <a name="l00225"></a>00225 <span class="comment"> * in the ARP cache, and if so the ARP cache entry…
246 <a name="l00226"></a>00226 <span class="comment"> * refreshed. If no ARP cache entry was found, a n…
247 <a name="l00227"></a>00227 <span class="comment"> *</span>
248 <a name="l00228"></a>00228 <span class="comment"> * This function expects an IP packet with a prepe…
249 <a name="l00229"></a>00229 <span class="comment"> * in the uip_buf[] buffer, and the length of the …
250 <a name="l00230"></a>00230 <span class="comment"> * variable uip_len.</span>
251 <a name="l00231"></a>00231 <span class="comment"> */</span>
252 <a name="l00232"></a>00232 <span class="comment">/*------------------------------------------------…
253 <a name="l00233"></a>00233 <span class="preprocessor">#if 0</span>
254 <a name="l00234"></a>00234 <span class="preprocessor"></span><span class="keywordtype">void</span>
255 <a name="l00235"></a>00235 <a class="code" href="a00152.html#g737337d6a51e31b236c8233d024138a8">uip…
256 <a name="l00236"></a>00236 {
257 …a name="l00237"></a>00237 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">u…
258 <a name="l00238"></a>00238
259 <a name="l00239"></a>00239 <span class="comment">/* Only insert/update an entry if the source IP …
260 <a name="l00240"></a>00240 <span class="comment"> incoming IP packet comes from a host on the l…
261 …a name="l00241"></a>00241 <span class="keywordflow">if</span>((<a class="code" href="a00152.html…
262 …a name="l00242"></a>00242 (<a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd5…
263 <a name="l00243"></a>00243 <span class="keywordflow">return</span>;
264 <a name="l00244"></a>00244 }
265 <a name="l00245"></a>00245 <span class="keywordflow">if</span>((<a class="code" href="a00152.html…
266 <a name="l00246"></a>00246 (<a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd5…
267 <a name="l00247"></a>00247 <span class="keywordflow">return</span>;
268 <a name="l00248"></a>00248 }
269 …a name="l00249"></a>00249 uip_arp_update(<a class="code" href="a00152.html#g9f2196e2705036869611…
270 <a name="l00250"></a>00250
271 <a name="l00251"></a>00251 <span class="keywordflow">return</span>;
272 <a name="l00252"></a>00252 }
273 <a name="l00253"></a>00253 <span class="preprocessor">#endif </span><span class="comment">/* 0 */</…
274 <a name="l00254"></a>00254 <span class="comment">/*------------------------------------------------…
275 <a name="l00255"></a>00255 <span class="comment">/**</span>
276 <a name="l00256"></a>00256 <span class="comment"> * ARP processing for incoming ARP packets.</span>
277 <a name="l00257"></a>00257 <span class="comment"> *</span>
278 <a name="l00258"></a>00258 <span class="comment"> * This function should be called by the device dr…
279 <a name="l00259"></a>00259 <span class="comment"> * packet has been received. The function will act…
280 <a name="l00260"></a>00260 <span class="comment"> * depending on the ARP packet type: if it is a re…
281 <a name="l00261"></a>00261 <span class="comment"> * that we previously sent out, the ARP cache will…
282 <a name="l00262"></a>00262 <span class="comment"> * the values from the ARP reply. If the incoming …
283 <a name="l00263"></a>00263 <span class="comment"> * request for our IP address, an ARP reply packet…
284 <a name="l00264"></a>00264 <span class="comment"> * into the uip_buf[] buffer.</span>
285 <a name="l00265"></a>00265 <span class="comment"> *</span>
286 <a name="l00266"></a>00266 <span class="comment"> * When the function returns, the value of the glo…
287 <a name="l00267"></a>00267 <span class="comment"> * indicates whether the device driver should send…
288 <a name="l00268"></a>00268 <span class="comment"> * not. If uip_len is zero, no packet should be se…
289 <a name="l00269"></a>00269 <span class="comment"> * non-zero, it contains the length of the outboun…
290 <a name="l00270"></a>00270 <span class="comment"> * present in the uip_buf[] buffer.</span>
291 <a name="l00271"></a>00271 <span class="comment"> *</span>
292 <a name="l00272"></a>00272 <span class="comment"> * This function expects an ARP packet with a prep…
293 <a name="l00273"></a>00273 <span class="comment"> * header in the uip_buf[] buffer, and the length …
294 <a name="l00274"></a>00274 <span class="comment"> * global variable uip_len.</span>
295 <a name="l00275"></a>00275 <span class="comment"> */</span>
296 <a name="l00276"></a>00276 <span class="comment">/*------------------------------------------------…
297 <a name="l00277"></a>00277 <span class="keywordtype">void</span>
298 …a name="l00278"></a><a class="code" href="a00152.html#g902c4a360134096224bc2655f623aa5f">00278</a>…
299 <a name="l00279"></a>00279 {
300 <a name="l00280"></a>00280
301 <a name="l00281"></a>00281 <span class="keywordflow">if</span>(<a class="code" href="a00149.html#…
302 <a name="l00282"></a>00282 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1"…
303 <a name="l00283"></a>00283 <span class="keywordflow">return</span>;
304 <a name="l00284"></a>00284 }
305 <a name="l00285"></a>00285 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">u…
306 <a name="l00286"></a>00286
307 <a name="l00287"></a>00287 <span class="keywordflow">switch</span>(<a class="code" href="a00150.h…
308 …a name="l00288"></a>00288 <span class="keywordflow">case</span> <a class="code" href="a00148.htm…
309 <a name="l00289"></a>00289 <span class="comment">/* ARP request. If it asked for our address, w…
310 <a name="l00290"></a>00290 <span class="comment"> reply. */</span>
311 …a name="l00291"></a>00291 <span class="keywordflow">if</span>(<a class="code" href="a00148.htm…
312 <a name="l00292"></a>00292 <span class="comment">/* First, we register the one who made the r…
313 <a name="l00293"></a>00293 <span class="comment"> table, since it is likely that we will do…
314 <a name="l00294"></a>00294 <span class="comment"> with this host in the future. */</span>
315 …a name="l00295"></a>00295 uip_arp_update(<a class="code" href="a00150.html#g24f52ac52d6e714c…
316 <a name="l00296"></a>00296
317 <a name="l00297"></a>00297 <span class="comment">/* The reply opcode is 2. */</span>
318 …a name="l00298"></a>00298 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
319 <a name="l00299"></a>00299
320 …a name="l00300"></a>00300 memcpy(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa0…
321 …a name="l00301"></a>00301 memcpy(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa0…
322 …a name="l00302"></a>00302 memcpy(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa0…
323 …a name="l00303"></a>00303 memcpy(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa0…
324 <a name="l00304"></a>00304
325 …a name="l00305"></a>00305 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
326 …a name="l00306"></a>00306 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
327 …a name="l00307"></a>00307 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
328 …a name="l00308"></a>00308 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
329 <a name="l00309"></a>00309
330 …a name="l00310"></a>00310 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
331 <a name="l00311"></a>00311 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a…
332 <a name="l00312"></a>00312 }
333 <a name="l00313"></a>00313 <span class="keywordflow">break</span>;
334 …a name="l00314"></a>00314 <span class="keywordflow">case</span> <a class="code" href="a00148.htm…
335 <a name="l00315"></a>00315 <span class="comment">/* ARP reply. We insert or update the ARP tabl…
336 <a name="l00316"></a>00316 <span class="comment"> for us. */</span>
337 …a name="l00317"></a>00317 <span class="keywordflow">if</span>(<a class="code" href="a00148.htm…
338 …a name="l00318"></a>00318 uip_arp_update(<a class="code" href="a00150.html#g24f52ac52d6e714c…
339 <a name="l00319"></a>00319 }
340 <a name="l00320"></a>00320 <span class="keywordflow">break</span>;
341 <a name="l00321"></a>00321 }
342 <a name="l00322"></a>00322
343 <a name="l00323"></a>00323 <span class="keywordflow">return</span>;
344 <a name="l00324"></a>00324 }
345 <a name="l00325"></a>00325 <span class="comment">/*------------------------------------------------…
346 <a name="l00326"></a>00326 <span class="comment">/**</span>
347 <a name="l00327"></a>00327 <span class="comment"> * Prepend Ethernet header to an outbound IP packe…
348 <a name="l00328"></a>00328 <span class="comment"> * to send out an ARP request.</span>
349 <a name="l00329"></a>00329 <span class="comment"> *</span>
350 <a name="l00330"></a>00330 <span class="comment"> * This function should be called before sending o…
351 <a name="l00331"></a>00331 <span class="comment"> * function checks the destination IP address of t…
352 <a name="l00332"></a>00332 <span class="comment"> * what Ethernet MAC address that should be used a…
353 <a name="l00333"></a>00333 <span class="comment"> * address on the Ethernet.</span>
354 <a name="l00334"></a>00334 <span class="comment"> *</span>
355 <a name="l00335"></a>00335 <span class="comment"> * If the destination IP address is in the local n…
356 <a name="l00336"></a>00336 <span class="comment"> * by logical ANDing of netmask and our IP address…
357 <a name="l00337"></a>00337 <span class="comment"> * checks the ARP cache to see if an entry for the…
358 <a name="l00338"></a>00338 <span class="comment"> * address is found. If so, an Ethernet header is …
359 <a name="l00339"></a>00339 <span class="comment"> * function returns. If no ARP cache entry is foun…
360 <a name="l00340"></a>00340 <span class="comment"> * destination IP address, the packet in the uip_b…
361 <a name="l00341"></a>00341 <span class="comment"> * an ARP request packet for the IP address. The I…
362 <a name="l00342"></a>00342 <span class="comment"> * and it is assumed that they higher level protoc…
363 <a name="l00343"></a>00343 <span class="comment"> * eventually will retransmit the dropped packet.<…
364 <a name="l00344"></a>00344 <span class="comment"> *</span>
365 <a name="l00345"></a>00345 <span class="comment"> * If the destination IP address is not on the loc…
366 <a name="l00346"></a>00346 <span class="comment"> * address of the default router is used instead.<…
367 <a name="l00347"></a>00347 <span class="comment"> *</span>
368 <a name="l00348"></a>00348 <span class="comment"> * When the function returns, a packet is present …
369 <a name="l00349"></a>00349 <span class="comment"> * buffer, and the length of the packet is in the …
370 <a name="l00350"></a>00350 <span class="comment"> * uip_len.</span>
371 <a name="l00351"></a>00351 <span class="comment"> */</span>
372 <a name="l00352"></a>00352 <span class="comment">/*------------------------------------------------…
373 <a name="l00353"></a>00353 <span class="keywordtype">void</span>
374 …a name="l00354"></a><a class="code" href="a00152.html#g54b27e45df15e10a0eb1a3e3a91417d2">00354</a>…
375 <a name="l00355"></a>00355 {
376 <a name="l00356"></a>00356 <span class="keyword">struct </span>arp_entry *tabptr;
377 <a name="l00357"></a>00357
378 <a name="l00358"></a>00358 <span class="comment">/* Find the destination IP address in the ARP ta…
379 <a name="l00359"></a>00359 <span class="comment"> the Ethernet header. If the destination IP ad…
380 <a name="l00360"></a>00360 <span class="comment"> local network, we use the default router's IP…
381 <a name="l00361"></a>00361 <span class="comment"></span>
382 <a name="l00362"></a>00362 <span class="comment"> If not ARP table entry is found, we overwrite…
383 <a name="l00363"></a>00363 <span class="comment"> packet with an ARP request for the IP address…
384 <a name="l00364"></a>00364
385 <a name="l00365"></a>00365 <span class="comment">/* First check if destination is a local broadca…
386 …a name="l00366"></a>00366 <span class="keywordflow">if</span>(<a class="code" href="a00148.html#…
387 …a name="l00367"></a>00367 memcpy(<a class="code" href="a00152.html#g9f2196e2705036869611962425…
388 <a name="l00368"></a>00368 } <span class="keywordflow">else</span> {
389 <a name="l00369"></a>00369 <span class="comment">/* Check if the destination address is on the …
390 …a name="l00370"></a>00370 <span class="keywordflow">if</span>(!<a class="code" href="a00148.ht…
391 <a name="l00371"></a>00371 <span class="comment">/* Destination address was not on the local …
392 <a name="l00372"></a>00372 <span class="comment"> use the default router's IP address inste…
393 <a name="l00373"></a>00373 <span class="comment"> address when determining the MAC address.…
394 …a name="l00374"></a>00374 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b6…
395 <a name="l00375"></a>00375 } <span class="keywordflow">else</span> {
396 <a name="l00376"></a>00376 <span class="comment">/* Else, we use the destination IP address. …
397 …a name="l00377"></a>00377 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b6…
398 <a name="l00378"></a>00378 }
399 <a name="l00379"></a>00379
400 …a name="l00380"></a>00380 <span class="keywordflow">for</span>(i = 0; i < <a class="code" h…
401 <a name="l00381"></a>00381 tabptr = &arp_table[i];
402 …a name="l00382"></a>00382 <span class="keywordflow">if</span>(<a class="code" href="a00148.h…
403 <a name="l00383"></a>00383 <span class="keywordflow">break</span>;
404 <a name="l00384"></a>00384 }
405 <a name="l00385"></a>00385 }
406 <a name="l00386"></a>00386
407 …a name="l00387"></a>00387 <span class="keywordflow">if</span>(i == <a class="code" href="a0015…
408 <a name="l00388"></a>00388 <span class="comment">/* The destination address was not in our AR…
409 <a name="l00389"></a>00389 <span class="comment"> overwrite the IP packet with an ARP reque…
410 <a name="l00390"></a>00390
411 <a name="l00391"></a>00391 memset(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa0…
412 <a name="l00392"></a>00392 memset(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa0…
413 …a name="l00393"></a>00393 memcpy(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa0…
414 …a name="l00394"></a>00394 memcpy(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa0…
415 <a name="l00395"></a>00395
416 …a name="l00396"></a>00396 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b6…
417 …a name="l00397"></a>00397 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b6…
418 …a name="l00398"></a>00398 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
419 …a name="l00399"></a>00399 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
420 …a name="l00400"></a>00400 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
421 <a name="l00401"></a>00401 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
422 <a name="l00402"></a>00402 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
423 …a name="l00403"></a>00403 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd…
424 <a name="l00404"></a>00404
425 …a name="l00405"></a>00405 <a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc6…
426 <a name="l00406"></a>00406
427 <a name="l00407"></a>00407 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a…
428 <a name="l00408"></a>00408 <span class="keywordflow">return</span>;
429 <a name="l00409"></a>00409 }
430 <a name="l00410"></a>00410
431 <a name="l00411"></a>00411 <span class="comment">/* Build an ethernet header. */</span>
432 <a name="l00412"></a>00412 memcpy(<a class="code" href="a00152.html#g9f2196e2705036869611962425…
433 <a name="l00413"></a>00413 }
434 …a name="l00414"></a>00414 memcpy(<a class="code" href="a00152.html#g9f2196e2705036869611962425e4…
435 <a name="l00415"></a>00415
436 …a name="l00416"></a>00416 <a class="code" href="a00152.html#g9f2196e2705036869611962425e404bf">I…
437 <a name="l00417"></a>00417
438 …a name="l00418"></a>00418 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">u…
439 <a name="l00419"></a>00419 }
440 <a name="l00420"></a>00420 <span class="comment">/*------------------------------------------------…
441 <a name="l00421"></a>00421 <span class="comment"></span>
442 <a name="l00422"></a>00422 <span class="comment">/** @} */</span><span class="comment"></span>
443 <a name="l00423"></a>00423 <span class="comment">/** @} */</span>
445 <a href="http://www.doxygen.org/index.html">
446 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address>