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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/ip.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></div><div class="nav"><a class="el" href="dir_000001.html">net</a></div><h1>ip.c</h1><a href="ip_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file ip.c \brief IP (Internet Protocol) Library. */</span>00002 <span class="comment">//*****************************************************************************</span>00003 <span class="comment">//</span>00004 <span class="comment">// File Name : 'ip.c'</span>00005 <span class="comment">// Title : IP (Internet Protocol) Library</span>00006 <span class="comment">// Author : Pascal Stang</span>00007 <span class="comment">// Created : 8/30/2004</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 00016 <span class="preprocessor">#include <inttypes.h></span>00017 <span class="preprocessor">#include "<a class="code" href="global_8h.html">global.h</a>"</span>00018 <span class="preprocessor">#include "<a class="code" href="rprintf_8h.html">rprintf.h</a>"</span>00019 00020 <span class="preprocessor">#include "<a class="code" href="net_8h.html">net.h</a>"</span>00021 <span class="preprocessor">#include "<a class="code" href="nic_8h.html">nic.h</a>"</span>00022 <span class="preprocessor">#include "<a class="code" href="ip_8h.html">ip.h</a>"</span>00023 00024 uint32_t IpMyAddress;00025 uint32_t IpNetmask;00026 uint32_t IpGateway;00027 <a name="l00028"></a><a class="code" href="group__ip.html#ga0">00028</a> <span class="keywordtype">void</span> <a class="code" href="group__ip.html#ga0">ipSetAddress</a>(uint32_t myIp, uint32_t netmask, uint32_t gatewayIp)00029 {00030 IpMyAddress = myIp;00031 IpNetmask = netmask;00032 IpGateway = gatewayIp;00033 }00034 <a name="l00035"></a><a class="code" href="group__ip.html#ga1">00035</a> uint32_t <a class="code" href="group__ip.html#ga1">ipGetMyAddress</a>(<span class="keywordtype">void</span>)00036 {00037 <span class="keywordflow">return</span> IpMyAddress;00038 }00039 <a name="l00040"></a><a class="code" href="group__ip.html#ga2">00040</a> <span class="keywordtype">void</span> <a class="code" href="group__ip.html#ga2">ipSend</a>(uint32_t dstIp, uint8_t protocol, uint16_t len, uint8_t* data)00041 {00042 <span class="comment">// make pointer to ethernet/IP header</span>00043 <span class="keyword">struct </span>netEthIpHeader* ethIpHeader;00044 00045 <span class="comment">// move data pointer to make room for headers</span>00046 data -= ETH_HEADER_LEN+IP_HEADER_LEN;00047 ethIpHeader = (<span class="keyword">struct </span>netEthIpHeader*)data;00048 00049 <span class="comment">// debugPrintHexTable(len+ETH_HEADER_LEN+IP_HEADER_LEN, data);</span>00050 00051 <span class="comment">// adjust length to add IP header</span>00052 len += IP_HEADER_LEN;00053 00054 <span class="comment">// fill IP header</span>00055 ethIpHeader->ip.destipaddr = <a class="code" href="group__net.html#ga26">HTONL</a>(dstIp);00056 ethIpHeader->ip.srcipaddr = <a class="code" href="group__net.html#ga26">HTONL</a>(IpMyAddress);00057 ethIpHeader->ip.proto = protocol;00058 ethIpHeader->ip.len = <a class="code" href="group__net.html#ga2">htons</a>(len);00059 ethIpHeader->ip.vhl = 0x45;00060 ethIpHeader->ip.tos = 0;00061 ethIpHeader->ip.ipid = 0;00062 ethIpHeader->ip.ipoffset = 0;00063 ethIpHeader->ip.ttl = IP_TIME_TO_LIVE;00064 ethIpHeader->ip.ipchksum = 0;00065 00066 <span class="comment">// calculate and apply IP checksum</span>00067 <span class="comment">// DO THIS ONLY AFTER ALL CHANGES HAVE BEEN MADE TO IP HEADER</span>00068 ethIpHeader->ip.ipchksum = <a class="code" href="group__net.html#ga7">netChecksum</a>(&ethIpHeader->ip, IP_HEADER_LEN);00069 00070 <span class="comment">// add ethernet routing</span>00071 <span class="comment">// check if we need to send to gateway</span>00072 <span class="keywordflow">if</span>( (dstIp & IpNetmask) == (IpMyAddress & IpNetmask) )00073 <a class="code" href="group__arp.html#ga4">arpIpOut</a>(ethIpHeader,0); <span class="comment">// local send</span>00074 <span class="keywordflow">else</span>00075 <a class="code" href="group__arp.html#ga4">arpIpOut</a>(ethIpHeader,IpGateway); <span class="comment">// gateway send</span>00076 00077 <span class="comment">// adjust length to add ethernet header</span>00078 len += ETH_HEADER_LEN;00079 00080 <span class="comment">// debug</span>00081 <span class="comment">//debugPrintHexTable(ETH_HEADER_LEN, &data[0]);</span>00082 <span class="comment">//debugPrintHexTable(len-ETH_HEADER_LEN, &data[ETH_HEADER_LEN]);</span>00083 00084 <span class="comment">// send it</span>00085 <a class="code" href="group__nic.html#ga1">nicSend</a>(len, data);00086 }00087 00088 <a name="l00089"></a><a class="code" href="group__ip.html#ga3">00089</a> <span class="keywordtype">void</span> <a class="code" href="group__ip.html#ga3">udpSend</a>(uint32_t dstIp, uint16_t dstPort, uint16_t len, uint8_t* data)00090 {00091 <span class="comment">// make pointer to UDP header</span>00092 <span class="keyword">struct </span>netUdpHeader* udpHeader;00093 <span class="comment">// move data pointer to make room for UDP header</span>00094 data -= UDP_HEADER_LEN;00095 udpHeader = (<span class="keyword">struct </span>netUdpHeader*)data;00096 <span class="comment">// adjust length to add UDP header</span>00097 len += UDP_HEADER_LEN;00098 <span class="comment">// fill UDP header</span>00099 udpHeader->destport = <a class="code" href="group__net.html#ga25">HTONS</a>(dstPort);00100 udpHeader->srcport = <a class="code" href="group__net.html#ga25">HTONS</a>(dstPort);00101 udpHeader->udplen = <a class="code" href="group__net.html#ga2">htons</a>(len);00102 udpHeader->udpchksum = 0;00103 00104 <span class="comment">// debugPrintHexTable(UDP_HEADER_LEN, (uint8_t*)udpPacket);</span>00105 00106 <a class="code" href="group__ip.html#ga2">ipSend</a>(dstIp, IP_PROTO_UDP, len, (uint8_t*)udpHeader);00107 }</pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Aug 22 04:29:27 2005 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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