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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>Procyon AVRlib: net/icmp.c Source File</title><link href="dox.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.4.2 --><div class="qindex"><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="dirs.html">Directories</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></div><div class="nav"><a class="el" href="dir_000001.html">net</a></div><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></pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:07 2006 for Procyon AVRlib by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address></body></html>⌨️ 快捷键说明
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