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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/ip.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/ip.c</h1><a href="ip_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 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="datatypes_8h.html">inet/datatypes.h</a>></span>00072 <span class="preprocessor">#include <<a class="code" href="ethernet_8h.html">inet/ethernet.h</a>></span>00073 <span class="preprocessor">#include <<a class="code" href="arp_8h.html">inet/arp.h</a>></span>00074 <span class="preprocessor">#include <<a class="code" href="ip_8h.html">inet/ip.h</a>></span>00075 <span class="preprocessor">#include <<a class="code" href="system_8h.html">inet/system.h</a>></span>00076 00077 <a name="l00085"></a><a class="code" href="ip_8c.html#a0">00085</a> <span class="keyword">struct </span><a class="code" href="structip__frame.html">ip_frame</a> received_ip_packet;00086 <a name="l00095"></a><a class="code" href="ip_8c.html#a1">00095</a> <span class="keyword">struct </span><a class="code" href="structip__frame.html">ip_frame</a> send_ip_packet;00096 <a name="l00097"></a><a class="code" href="ip_8c.html#a2">00097</a> UINT16 <a class="code" href="ip_8c.html#a2">ip_id</a>; <a name="l00115"></a><a class="code" href="ip_8c.html#a3">00115</a> INT16 <a class="code" href="ip_8c.html#a3">process_ip_in</a> (<span class="keyword">struct</span> <a class="code" href="structethernet__frame.html">ethernet_frame</a>* frame)00116 {00117 00118 UINT8 olen;00119 UINT8 i;00120 00121 <span class="comment">/* Check for Protocol */</span>00122 00123 IP_DEBUGOUT(<span class="stringliteral">"Checking if IP Protocol\n\r"</span>);00124 00125 <span class="keywordflow">if</span>( frame-><a class="code" href="structethernet__frame.html#m3">protocol</a> != <a class="code" href="ethernet_8h.html#a4">PROTOCOL_IP</a> )00126 <span class="keywordflow">return</span>(-1);00127 00128 00129 IP_DEBUGOUT(<span class="stringliteral">"It's IP\n\r"</span>);00130 00131 <span class="keywordflow">if</span>( frame-><a class="code" href="structethernet__frame.html#m2">frame_size</a> < ETH_HEADER_LEN )00132 <span class="keywordflow">return</span>(-1);00133 00134 <span class="keywordflow">if</span>( (frame-><a class="code" href="structethernet__frame.html#m2">frame_size</a> - ETH_HEADER_LEN) < IP_HLEN )00135 <span class="keywordflow">return</span>(-1); 00136 00137 <span class="comment">/* Get IP Header Information */</span>00138 00139 <a class="code" href="system_8h.html#a14">NETWORK_RECEIVE_INITIALIZE</a>(frame-><a class="code" href="structethernet__frame.html#m4">buf_index</a>);00140 00141 received_ip_packet.<a class="code" href="structip__frame.html#m0">vihl</a> = <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00142 00143 <span class="comment">/* Is it IPv4? */</span>00144 00145 <span class="keywordflow">if</span>( (received_ip_packet.<a class="code" href="structip__frame.html#m0">vihl</a> & 0xF0) != 0x40 ) {00146 IP_DEBUGOUT(<span class="stringliteral">"ERROR: IP is not version 4!\n\r"</span>);00147 <span class="keywordflow">return</span>(-1);00148 }00149 00150 IP_DEBUGOUT(<span class="stringliteral">"IP Version 4 OK!\n\r"</span>); 00151 00152 received_ip_packet.<a class="code" href="structip__frame.html#m1">tos</a> = <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>(); 00153 00154 received_ip_packet.<a class="code" href="structip__frame.html#m2">tlen</a> = ((UINT16)<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()) << 8;00155 received_ip_packet.<a class="code" href="structip__frame.html#m2">tlen</a> |= <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00156 00157 received_ip_packet.<a class="code" href="structip__frame.html#m3">id</a> = ((UINT16)<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()) << 8;00158 received_ip_packet.<a class="code" href="structip__frame.html#m3">id</a> |= <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00159 00160 received_ip_packet.<a class="code" href="structip__frame.html#m4">frags</a> = ((UINT16)<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()) << 8;00161 received_ip_packet.<a class="code" href="structip__frame.html#m4">frags</a> |= <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00162 00163 received_ip_packet.<a class="code" href="structip__frame.html#m5">ttl</a>= <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00164 00165 received_ip_packet.<a class="code" href="structip__frame.html#m6">protocol</a>= <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00166 00167 received_ip_packet.<a class="code" href="structip__frame.html#m7">checksum</a> = ((UINT16)<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()) << 8;00168 received_ip_packet.<a class="code" href="structip__frame.html#m7">checksum</a> |= <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00169 00170 received_ip_packet.<a class="code" href="structip__frame.html#m8">sip</a> = (((UINT32)<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()) << 24);00171 received_ip_packet.<a class="code" href="structip__frame.html#m8">sip</a> |= (((UINT32)<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()) << 16);00172 received_ip_packet.<a class="code" href="structip__frame.html#m8">sip</a> |= (((UINT32)<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()) << 8);00173 received_ip_packet.<a class="code" href="structip__frame.html#m8">sip</a> |= <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00174 00175 received_ip_packet.<a class="code" href="structip__frame.html#m9">dip</a> = (((UINT32)<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()) << 24);00176 received_ip_packet.<a class="code" href="structip__frame.html#m9">dip</a> |= (((UINT32)<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()) << 16);00177 received_ip_packet.<a class="code" href="structip__frame.html#m9">dip</a> |= (((UINT32)<a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>()) << 8);00178 received_ip_packet.<a class="code" href="structip__frame.html#m9">dip</a> |= <a class="code" href="system_8h.html#a9">RECEIVE_NETWORK_B</a>();00179 00180 <span class="comment">/* Is that packet for us? */</span>00181 00182 00183 <span class="keywordflow">if</span>((received_ip_packet.<a class="code" href="structip__frame.html#m9">dip</a> != localmachine.localip )&&00184 (received_ip_packet.<a class="code" href="structip__frame.html#m9">dip</a> != IP_BROADCAST_ADDRESS)) {00185 00186 <span class="comment">/* It's not for us. Check still if ICMP with rigth physical */</span>00187 <span class="comment">/* address that migth be used to set temporary IP */</span>00188 00189 IP_DEBUGOUT(<span class="stringliteral">"IP address does not match!\n\r"</span>);00190 00191 <span class="keywordflow">if</span>( received_ip_packet.<a class="code" href="structip__frame.html#m6">protocol</a> != <a class="code" href="ip_8h.html#a1">IP_ICMP</a>) 00192 <span class="keywordflow">return</span>(-1);00193 00194 <span class="comment">/* Check physical address */</span>00195 00196 <span class="keywordflow">for</span>(i=0; i<<a class="code" href="ip_8h.html#a0">PHY_ADR_LEN</a>; i++)00197 {00198 <span class="keywordflow">if</span>(frame-><a class="code" href="structethernet__frame.html#m0">destination</a>[i] != localmachine.localHW[i])00199 <span class="keywordflow">return</span>(-1);00200 } 00201 00202 }00203 00204 00205 <span class="comment">/* Is there options to copy? */</span>00206 ⌨️ 快捷键说明
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