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<h1>icmp.c</h1><a href="icmp_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file icmp.c \brief ICMP Protocol Library. */</span>
00002 <span class="comment">//*****************************************************************************</span>
00003 <span class="comment">//</span>
00004 <span class="comment">// File Name : 'icmp.c'</span>
00005 <span class="comment">// Title : ICMP (Internet Control Message Protocol) Protocol Library</span>
00006 <span class="comment">// Author : Pascal Stang</span>
00007 <span class="comment">// Created : 9/10/2004</span>
00008 <span class="comment">// Revised : 7/3/2005</span>
00009 <span class="comment">// Version : 0.1</span>
00010 <span class="comment">// Target MCU : Atmel AVR series</span>
00011 <span class="comment">// Editor Tabs : 4</span>
00012 <span class="comment">//</span>
00013 <span class="comment">//*****************************************************************************</span>
00014
00015 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>
00016 <span class="preprocessor">#include "<a class="code" href="net_8h.html">net.h</a>"</span>
00017 <span class="preprocessor">#include "<a class="code" href="nic_8h.html">nic.h</a>"</span>
00018 <span class="preprocessor">#include "<a class="code" href="arp_8h.html">arp.h</a>"</span>
00019 <span class="preprocessor">#include "<a class="code" href="icmp_8h.html">icmp.h</a>"</span>
00020
00021 <span class="preprocessor">#include "<a class="code" href="rprintf_8h.html">rprintf.h</a>"</span>
00022 <span class="preprocessor">#include "<a class="code" href="debug_8h.html">debug.h</a>"</span>
00023
00024 <span class="comment">//extern void nicSend(unsigned int len, unsigned char* packet);</span>
00025
00026 <span class="comment">// global variables</span>
00027
00028
00029 <span class="comment">// functions</span>
<a name="l00030"></a><a class="code" href="group__icmp.html#ga0">00030</a> <span class="keywordtype">void</span> <a class="code" href="group__icmp.html#ga0">icmpInit</a>(<span class="keywordtype">void</span>)
00031 {
00032 }
00033
<a name="l00034"></a><a class="code" href="group__icmp.html#ga1">00034</a> <span class="keywordtype">void</span> <a class="code" href="group__icmp.html#ga1">icmpIpIn</a>(icmpip_hdr* packet)
00035 {
00036 <span class="comment">// check ICMP type</span>
00037 <span class="keywordflow">switch</span>(packet->icmp.type)
00038 {
00039 <span class="keywordflow">case</span> ICMP_TYPE_ECHOREQUEST:
00040 <span class="comment">// echo request</span>
00041 <a class="code" href="group__icmp.html#ga2">icmpEchoRequest</a>(packet);
00042 <span class="keywordflow">break</span>;
00043 <span class="keywordflow">default</span>:
00044 <span class="keywordflow">break</span>;
00045 }
00046 }
00047
<a name="l00048"></a><a class="code" href="group__icmp.html#ga2">00048</a> <span class="keywordtype">void</span> <a class="code" href="group__icmp.html#ga2">icmpEchoRequest</a>(icmpip_hdr* packet)
00049 {
00050 uint32_t tempIp;
00051
00052 <span class="comment">// change type to reply</span>
00053 packet->icmp.type = ICMP_TYPE_ECHOREPLY;
00054 <span class="comment">// recalculate checksum</span>
00055 packet->icmp.icmpchksum = 0;
00056 packet->icmp.icmpchksum = <a class="code" href="group__net.html#ga4">netChecksum</a>((u08*)&packet->icmp, <a class="code" href="group__net.html#ga2">htons</a>(packet->ip.len)-IP_HEADER_LEN);
00057 <span class="comment">// return to sender</span>
00058 tempIp = packet->ip.destipaddr;
00059 packet->ip.destipaddr = packet->ip.srcipaddr;
00060 packet->ip.srcipaddr = tempIp;
00061 <span class="comment">// add ethernet routing</span>
00062 <a class="code" href="group__arp.html#ga4">arpIpOut</a>((<span class="keyword">struct</span> netEthIpHeader*)(((u08*)packet)-ETH_HEADER_LEN), 0);
00063
00064 <span class="comment">// debugging</span>
00065 <span class="preprocessor"> #if NET_DEBUG >= 2</span>
00066 <span class="preprocessor"></span> <a class="code" href="group__icmp.html#ga3">icmpPrintHeader</a>(packet);
00067 <span class="comment">//debugPrintHexTable(htons(packet->ip.len), (u08*)packet);</span>
00068 <span class="preprocessor"> #endif</span>
00069 <span class="preprocessor"></span>
00070 <span class="comment">// send it (packet->ip.len+ETH_HEADER_LEN</span>
00071 <a class="code" href="group__nic.html#ga1">nicSend</a>(<a class="code" href="group__net.html#ga2">htons</a>(packet->ip.len)+ETH_HEADER_LEN, (((u08*)packet)-ETH_HEADER_LEN));
00072 }
00073
00074 <span class="preprocessor">#ifdef ICMP_DEBUG_PRINT</span>
00075 <span class="preprocessor"></span><span class="keywordtype">void</span> <a class="code" href="group__icmp.html#ga3">icmpPrintHeader</a>(icmpip_hdr* packet)
00076 {
00077 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"ICMP Packet:\r\n"</span>);
00078 <span class="comment">// print source IP address</span>
00079 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"SrcIpAddr: "</span>); <a class="code" href="group__net.html#ga6">netPrintIPAddr</a>(<a class="code" href="group__net.html#ga3">htonl</a>(packet->ip.srcipaddr)); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00080 <span class="comment">// print dest IP address</span>
00081 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"DstIpAddr: "</span>); <a class="code" href="group__net.html#ga6">netPrintIPAddr</a>(<a class="code" href="group__net.html#ga3">htonl</a>(packet->ip.destipaddr)); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00082 <span class="comment">// print type</span>
00083 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Type : "</span>);
00084 <span class="keywordflow">switch</span>(packet->icmp.type)
00085 {
00086 <span class="keywordflow">case</span> ICMP_TYPE_ECHOREQUEST: <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"ECHO REQUEST"</span>); <span class="keywordflow">break</span>;
00087 <span class="keywordflow">case</span> ICMP_TYPE_ECHOREPLY: <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"ECHO REPLY"</span>); <span class="keywordflow">break</span>;
00088 <span class="keywordflow">default</span>: <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"UNKNOWN"</span>); <span class="keywordflow">break</span>;
00089 }
00090 <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00091 <span class="comment">// print code</span>
00092 <a class="code" href="group__rprintf.html#ga15">rprintfProgStrM</a>(<span class="stringliteral">"Code : 0x"</span>); <a class="code" href="group__rprintf.html#ga7">rprintfu08</a>(packet->icmp.icode); <a class="code" href="group__rprintf.html#ga5">rprintfCRLF</a>();
00093 }
00094 <span class="preprocessor">#endif</span>
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