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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>/opentcp/arp.c Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.2.18 --><center><a class="qindex" href="main.html">Main Page</a> <a class="qindex" href="modules.html">Modules</a> <a class="qindex" href="annotated.html">Data Structures</a> <a class="qindex" href="files.html">File List</a> <a class="qindex" href="functions.html">Data Fields</a> <a class="qindex" href="globals.html">Globals</a> <a class="qindex" href="pages.html">Related Pages</a> <a class="qindex" href="examples.html">Examples</a> </center><hr><h1>/opentcp/arp.c</h1><a href="arp_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <span class="comment">/*</span>00002 <span class="comment"> *Copyright (c) 2000-2002 Viola Systems Ltd.</span>00003 <span class="comment"> *All rights reserved.</span>00004 <span class="comment"> *</span>00005 <span class="comment"> *Redistribution and use in source and binary forms, with or without </span>00006 <span class="comment"> *modification, are permitted provided that the following conditions </span>00007 <span class="comment"> *are met:</span>00008 <span class="comment"> *</span>00009 <span class="comment"> *1. Redistributions of source code must retain the above copyright </span>00010 <span class="comment"> *notice, this list of conditions and the following disclaimer.</span>00011 <span class="comment"> *</span>00012 <span class="comment"> *2. Redistributions in binary form must reproduce the above copyright </span>00013 <span class="comment"> *notice, this list of conditions and the following disclaimer in the </span>00014 <span class="comment"> *documentation and/or other materials provided with the distribution.</span>00015 <span class="comment"> *</span>00016 <span class="comment"> *3. The end-user documentation included with the redistribution, if </span>00017 <span class="comment"> *any, must include the following acknowledgment:</span>00018 <span class="comment"> * "This product includes software developed by Viola </span>00019 <span class="comment"> * Systems (http://www.violasystems.com/)."</span>00020 <span class="comment"> *</span>00021 <span class="comment"> *Alternately, this acknowledgment may appear in the software itself, </span>00022 <span class="comment"> *if and wherever such third-party acknowledgments normally appear.</span>00023 <span class="comment"> *</span>00024 <span class="comment"> *4. The names "OpenTCP" and "Viola Systems" must not be used to </span>00025 <span class="comment"> *endorse or promote products derived from this software without prior </span>00026 <span class="comment"> *written permission. For written permission, please contact </span>00027 <span class="comment"> *opentcp@opentcp.org.</span>00028 <span class="comment"> *</span>00029 <span class="comment"> *5. Products derived from this software may not be called "OpenTCP", </span>00030 <span class="comment"> *nor may "OpenTCP" appear in their name, without prior written </span>00031 <span class="comment"> *permission of the Viola Systems Ltd.</span>00032 <span class="comment"> *</span>00033 <span class="comment"> *THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED </span>00034 <span class="comment"> *WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF </span>00035 <span class="comment"> *MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. </span>00036 <span class="comment"> *IN NO EVENT SHALL VIOLA SYSTEMS LTD. OR ITS CONTRIBUTORS BE LIABLE </span>00037 <span class="comment"> *FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR </span>00038 <span class="comment"> *CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF </span>00039 <span class="comment"> *SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR </span>00040 <span class="comment"> *BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, </span>00041 <span class="comment"> *WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE </span>00042 <span class="comment"> *OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, </span>00043 <span class="comment"> *EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>00044 <span class="comment"> *====================================================================</span>00045 <span class="comment"> *</span>00046 <span class="comment"> *OpenTCP is the unified open source TCP/IP stack available on a series </span>00047 <span class="comment"> *of 8/16-bit microcontrollers, please see <http://www.opentcp.org>.</span>00048 <span class="comment"> *</span>00049 <span class="comment"> *For more information on how to network-enable your devices, or how to </span>00050 <span class="comment"> *obtain commercial technical support for OpenTCP, please see </span>00051 <span class="comment"> *<http://www.violasystems.com/>.</span>00052 <span class="comment"> */</span>00053 00069 <span class="preprocessor">#include <<a class="code" href="datatypes_8h.html">inet/datatypes.h</a>></span>00070 <span class="preprocessor">#include <<a class="code" href="debug_8h.html">inet/debug.h</a>></span>00071 <span class="preprocessor">#include <<a class="code" href="ethernet_8h.html">inet/ethernet.h</a>></span>00072 <span class="preprocessor">#include <<a class="code" href="arp_8h.html">inet/arp.h</a>></span>00073 <span class="preprocessor">#include <<a class="code" href="timers_8h.html">inet/timers.h</a>></span>00074 <span class="preprocessor">#include <<a class="code" href="system_8h.html">inet/system.h</a>></span>00075 <span class="preprocessor">#include <<a class="code" href="globalvariables_8h.html">inet/globalvariables.h</a>></span>00076 <a name="l00086"></a><a class="code" href="arp_8c.html#a0">00086</a> <span class="keyword">struct </span><a class="code" href="structarp__entry.html">arp_entry</a> arp_table[ARP_TSIZE]; 00087 <a name="l00094"></a><a class="code" href="arp_8c.html#a1">00094</a> UINT8 <a class="code" href="arp_8c.html#a1">arp_timer</a>; 00095 <a name="l00116"></a><a class="code" href="arp_8c.html#a2">00116</a> UINT8 <a class="code" href="arp_8c.html#a2">process_arp</a> (<span class="keyword">struct</span> <a class="code" href="structethernet__frame.html">ethernet_frame</a>* frame) {00117 00118 UINT8 temp; 00119 00120 <span class="comment">/* Check if ARP packet*/</span>00121 00122 <span class="keywordflow">if</span>( frame-><a class="code" href="structethernet__frame.html#m3">protocol</a> == ARP_ETHCODE ) {00123 <span class="comment">/* Yep, ARP */</span>00124 00125 <a class="code" href="system_8h.html#a14">NETWORK_RECEIVE_INITIALIZE</a>(frame-><a class="code" href="structethernet__frame.html#m4">buf_index</a>);00126 00127 <span class="comment">/* Is it long enough? */</span>00128 00129 <span class="keywordflow">if</span>( frame-><a class="code" href="structethernet__frame.html#m2">frame_size</a> < (2*<a class="code" href="arp_8h.html#a0">MAXHWALEN</a> + 2*<a class="code" href="arp_8h.html#a1">MAXPRALEN</a> + 2 + 6) ) {00130 <span class="comment">/* Somehow corrupted ARP packet */</span>00131 ARP_DEBUGOUT(<span class="stringliteral">"Corrupted ARP packet\n\r"</span>);00132 <span class="comment">/*NETWORK_RECEIVE_END();*/</span>00133 <span class="keywordflow">return</span>(TRUE);00134 }00135 00136 00137 <span class="comment">/* Ignore next 6 bytes: <HW type>, <Protocol type> */</span>00138 <span class="comment">/* <HW address len> and <Protocol address len> */</span>00139 00140 <span class="keywordflow">for</span>(temp=0; temp<6; temp++)00141 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00142 00143 ARP_DEBUGOUT(<span class="stringliteral">"Incoming ARP..\n\r"</span>);00144 00145 <span class="comment">/* Check if request or response */</span>00146 00147 <span class="keywordflow">if</span>( <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>() == 0x00) {00148 00149 temp = <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>(); <span class="comment">/* get opcode */</span>00150 00151 <span class="keywordflow">if</span>( temp == ARP_REQUEST ) {00152 ARP_DEBUGOUT(<span class="stringliteral">" ARP REQUEST Received..\n\r"</span>);00153 <a class="code" href="arp_8c.html#a3">arp_send_response</a>();00154 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>( temp == ARP_REPLY ) {00155 ARP_DEBUGOUT(<span class="stringliteral">"ARP Response Received..\n\r"</span>);00156 <a class="code" href="arp_8c.html#a4">arp_get_response</a>(); 00157 }00158 00159 <span class="comment">/* Wasn't request or response or all done, dump it */</span>00160 00161 }00162 00163 <span class="comment">/*NETWORK_RECEIVE_END();*/</span>00164 <span class="keywordflow">return</span>(TRUE);00165 00166 }00167 00168 <span class="comment">/* Wasn't ARP, don't touch the packet */</span>00169 00170 <span class="keywordflow">return</span>(FALSE); 00171 }00172 <a name="l00188"></a><a class="code" href="arp_8c.html#a3">00188</a> <span class="keywordtype">void</span> <a class="code" href="arp_8c.html#a3">arp_send_response</a>(<span class="keywordtype">void</span>)00189 {00190 <span class="keyword">struct </span><a class="code" href="structarp__entry.html">arp_entry</a> *qstruct;00191 UINT8 rem_hwadr[<a class="code" href="arp_8h.html#a0">MAXHWALEN</a>];00192 UINT32 rem_ip;00193 UINT32 ltemp;00194 INT8 i;00195 BYTE j;00196 00197 <span class="comment">/* Record Sender's HW address */</span>00198 00199 <span class="keywordflow">for</span>( i=<a class="code" href="arp_8h.html#a0">MAXHWALEN</a>-1; i >= 0; i-- )00200 rem_hwadr[i] = <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>(); 00201 00202 <span class="comment">/* Read Sender's IP Address */</span>00203 00204 <span class="keywordflow">for</span>( i=0; i<<a class="code" href="arp_8h.html#a1">MAXPRALEN</a>; i++) {00205 rem_ip <<= 8;00206 rem_ip |= <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00207 } 00208 00209 00210 <span class="comment">/* Skip Target HW address */</span>00211 00212 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00213 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00214 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00215 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00216 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00217 <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>(); 00218 00219 <span class="comment">/* Is The Packet For Us? */</span>00220 00221 <span class="keywordflow">for</span>( i=0; i<<a class="code" href="arp_8h.html#a1">MAXPRALEN</a>; i++) {00222 ltemp <<= 8;00223 ltemp |= <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00224 }00225 00226 00227 <span class="keywordflow">if</span>( ltemp != localmachine.localip ) 00228 <span class="keywordflow">return</span>; <span class="comment">/* No */</span>00229 00230 ARP_DEBUGOUT(<span class="stringliteral">"Preparing for ARP Reply\n\r"</span>);00231 00232 <span class="comment">/* OK. Now send reply */</span>00233 00234 <a class="code" href="system_8h.html#a17">NETWORK_SEND_INITIALIZE</a>(<a class="code" href="ethernet_8h.html#a35">ARP_BUFFER</a>);00235 00236 <span class="comment">/* Add datalink (Ethernet addresses) information */</span>00237 00238 <span class="keywordflow">for</span>( i=0; i<<a class="code" href="arp_8h.html#a0">MAXHWALEN</a>; i++) {00239 send_frame.destination[i] = rem_hwadr[i];00240 send_frame.source[i] = localmachine.localHW[i];00241 }00242 00243 send_frame.protocol = <a class="code" href="ethernet_8h.html#a5">PROTOCOL_ARP</a>;00244 00245 <a class="code" href="system_8h.html#a18">NETWORK_ADD_DATALINK</a>(&send_frame);00246 00247 <span class="comment">/* PUT ARP Data */</span>00248 00249 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>( (BYTE)(AR_HARDWARE>>8) ); <span class="comment">/* Hardware Type */</span>00250 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>( (BYTE)AR_HARDWARE );00251 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>(0x08); <span class="comment">/* Protocol Type */</span>00252 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>(0x00);00253 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>(<a class="code" href="arp_8h.html#a0">MAXHWALEN</a>); <span class="comment">/* HW Adr Len */</span>00254 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>(<a class="code" href="arp_8h.html#a1">MAXPRALEN</a>); <span class="comment">/* Protocol Adr. Len*/</span>00255 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>( 0x00 ); <span class="comment">/* ARP Opcode */</span> 00256 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>( 0x02 ); 00257 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>((UINT8)(localmachine.localHW[5])); <span class="comment">/* Address fields */</span>00258 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>((UINT8)(localmachine.localHW[4]));00259 <a class="code" href="system_8h.html#a11">SEND_NETWORK_B</a>((UINT8)(localmachine.localHW[3]));⌨️ 快捷键说明
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