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add uip git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1125 bbd45198-f89e-11dd-88c7-29a3b14d5316
2010-11-27 00:27:45 +08:00
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<h1>uip/uip.c</h1><a href="a00135.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a><a class="code" href="a00135.html#534d9e416324fb8ecca6b9cb4b1f6a6a">00001</a> <span class="preprocessor">#define DEBUG_PRINTF(...) </span><span class="comment">/*printf(__VA_ARGS__)*/</span>
<a name="l00002"></a>00002 <span class="comment"></span>
<a name="l00003"></a>00003 <span class="comment">/**</span>
<a name="l00004"></a>00004 <span class="comment"> * \defgroup uip The uIP TCP/IP stack</span>
<a name="l00005"></a>00005 <span class="comment"> * @{</span>
<a name="l00006"></a>00006 <span class="comment"> *</span>
<a name="l00007"></a>00007 <span class="comment"> * uIP is an implementation of the TCP/IP protocol stack intended for</span>
<a name="l00008"></a>00008 <span class="comment"> * small 8-bit and 16-bit microcontrollers.</span>
<a name="l00009"></a>00009 <span class="comment"> *</span>
<a name="l00010"></a>00010 <span class="comment"> * uIP provides the necessary protocols for Internet communication,</span>
<a name="l00011"></a>00011 <span class="comment"> * with a very small code footprint and RAM requirements - the uIP</span>
<a name="l00012"></a>00012 <span class="comment"> * code size is on the order of a few kilobytes and RAM usage is on</span>
<a name="l00013"></a>00013 <span class="comment"> * the order of a few hundred bytes.</span>
<a name="l00014"></a>00014 <span class="comment"> */</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment">/**</span>
<a name="l00017"></a>00017 <span class="comment"> * \file</span>
<a name="l00018"></a>00018 <span class="comment"> * The uIP TCP/IP stack code.</span>
<a name="l00019"></a>00019 <span class="comment"> * \author Adam Dunkels &lt;adam@dunkels.com&gt;</span>
<a name="l00020"></a>00020 <span class="comment"> */</span>
<a name="l00021"></a>00021
<a name="l00022"></a>00022 <span class="comment">/*</span>
<a name="l00023"></a>00023 <span class="comment"> * Copyright (c) 2001-2003, Adam Dunkels.</span>
<a name="l00024"></a>00024 <span class="comment"> * All rights reserved.</span>
<a name="l00025"></a>00025 <span class="comment"> *</span>
<a name="l00026"></a>00026 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00027"></a>00027 <span class="comment"> * modification, are permitted provided that the following conditions</span>
<a name="l00028"></a>00028 <span class="comment"> * are met:</span>
<a name="l00029"></a>00029 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
<a name="l00030"></a>00030 <span class="comment"> * notice, this list of conditions and the following disclaimer.</span>
<a name="l00031"></a>00031 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
<a name="l00032"></a>00032 <span class="comment"> * notice, this list of conditions and the following disclaimer in the</span>
<a name="l00033"></a>00033 <span class="comment"> * documentation and/or other materials provided with the distribution.</span>
<a name="l00034"></a>00034 <span class="comment"> * 3. The name of the author may not be used to endorse or promote</span>
<a name="l00035"></a>00035 <span class="comment"> * products derived from this software without specific prior</span>
<a name="l00036"></a>00036 <span class="comment"> * written permission.</span>
<a name="l00037"></a>00037 <span class="comment"> *</span>
<a name="l00038"></a>00038 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS</span>
<a name="l00039"></a>00039 <span class="comment"> * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span>
<a name="l00040"></a>00040 <span class="comment"> * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
<a name="l00041"></a>00041 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY</span>
<a name="l00042"></a>00042 <span class="comment"> * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
<a name="l00043"></a>00043 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE</span>
<a name="l00044"></a>00044 <span class="comment"> * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
<a name="l00045"></a>00045 <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,</span>
<a name="l00046"></a>00046 <span class="comment"> * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING</span>
<a name="l00047"></a>00047 <span class="comment"> * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span>
<a name="l00048"></a>00048 <span class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00049"></a>00049 <span class="comment"> *</span>
<a name="l00050"></a>00050 <span class="comment"> * This file is part of the uIP TCP/IP stack.</span>
<a name="l00051"></a>00051 <span class="comment"> *</span>
<a name="l00052"></a>00052 <span class="comment"> * $Id: uip.c,v 1.65 2006/06/11 21:46:39 adam Exp $</span>
<a name="l00053"></a>00053 <span class="comment"> *</span>
<a name="l00054"></a>00054 <span class="comment"> */</span>
<a name="l00055"></a>00055
<a name="l00056"></a>00056 <span class="comment">/*</span>
<a name="l00057"></a>00057 <span class="comment"> * uIP is a small implementation of the IP, UDP and TCP protocols (as</span>
<a name="l00058"></a>00058 <span class="comment"> * well as some basic ICMP stuff). The implementation couples the IP,</span>
<a name="l00059"></a>00059 <span class="comment"> * UDP, TCP and the application layers very tightly. To keep the size</span>
<a name="l00060"></a>00060 <span class="comment"> * of the compiled code down, this code frequently uses the goto</span>
<a name="l00061"></a>00061 <span class="comment"> * statement. While it would be possible to break the uip_process()</span>
<a name="l00062"></a>00062 <span class="comment"> * function into many smaller functions, this would increase the code</span>
<a name="l00063"></a>00063 <span class="comment"> * size because of the overhead of parameter passing and the fact that</span>
<a name="l00064"></a>00064 <span class="comment"> * the optimier would not be as efficient.</span>
<a name="l00065"></a>00065 <span class="comment"> *</span>
<a name="l00066"></a>00066 <span class="comment"> * The principle is that we have a small buffer, called the uip_buf,</span>
<a name="l00067"></a>00067 <span class="comment"> * in which the device driver puts an incoming packet. The TCP/IP</span>
<a name="l00068"></a>00068 <span class="comment"> * stack parses the headers in the packet, and calls the</span>
<a name="l00069"></a>00069 <span class="comment"> * application. If the remote host has sent data to the application,</span>
<a name="l00070"></a>00070 <span class="comment"> * this data is present in the uip_buf and the application read the</span>
<a name="l00071"></a>00071 <span class="comment"> * data from there. It is up to the application to put this data into</span>
<a name="l00072"></a>00072 <span class="comment"> * a byte stream if needed. The application will not be fed with data</span>
<a name="l00073"></a>00073 <span class="comment"> * that is out of sequence.</span>
<a name="l00074"></a>00074 <span class="comment"> *</span>
<a name="l00075"></a>00075 <span class="comment"> * If the application whishes to send data to the peer, it should put</span>
<a name="l00076"></a>00076 <span class="comment"> * its data into the uip_buf. The uip_appdata pointer points to the</span>
<a name="l00077"></a>00077 <span class="comment"> * first available byte. The TCP/IP stack will calculate the</span>
<a name="l00078"></a>00078 <span class="comment"> * checksums, and fill in the necessary header fields and finally send</span>
<a name="l00079"></a>00079 <span class="comment"> * the packet back to the peer.</span>
<a name="l00080"></a>00080 <span class="comment">*/</span>
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="preprocessor">#include "<a class="code" href="a00136.html">uip.h</a>"</span>
<a name="l00083"></a>00083 <span class="preprocessor">#include "<a class="code" href="a00140.html">uipopt.h</a>"</span>
<a name="l00084"></a>00084 <span class="preprocessor">#include "<a class="code" href="a00137.html">uip_arch.h</a>"</span>
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="preprocessor">#if UIP_CONF_IPV6</span>
<a name="l00087"></a>00087 <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="a00132.html">uip-neighbor.h</a>"</span>
<a name="l00088"></a>00088 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00089"></a>00089
<a name="l00090"></a>00090 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00091"></a>00091
<a name="l00092"></a>00092 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00093"></a>00093 <span class="comment">/* Variable definitions. */</span>
<a name="l00094"></a>00094
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="comment">/* The IP address of this host. If it is defined to be fixed (by</span>
<a name="l00097"></a>00097 <span class="comment"> setting UIP_FIXEDADDR to 1 in uipopt.h), the address is set</span>
<a name="l00098"></a>00098 <span class="comment"> here. Otherwise, the address */</span>
<a name="l00099"></a>00099 <span class="preprocessor">#if UIP_FIXEDADDR &gt; 0</span>
<a name="l00100"></a>00100 <span class="preprocessor"></span><span class="keyword">const</span> <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a> =
<a name="l00101"></a>00101 {<a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_IPADDR0 &lt;&lt; 8) | UIP_IPADDR1),
<a name="l00102"></a>00102 <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_IPADDR2 &lt;&lt; 8) | UIP_IPADDR3)};
<a name="l00103"></a>00103 <span class="keyword">const</span> <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> <a class="code" href="a00150.html#g20df5c82f2a15a508c19e505b5d9de2b">uip_draddr</a> =
<a name="l00104"></a>00104 {<a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_DRIPADDR0 &lt;&lt; 8) | UIP_DRIPADDR1),
<a name="l00105"></a>00105 <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_DRIPADDR2 &lt;&lt; 8) | UIP_DRIPADDR3)};
<a name="l00106"></a>00106 <span class="keyword">const</span> <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> <a class="code" href="a00150.html#g3237be0d9ec457de0177689ee23c0d5c">uip_netmask</a> =
<a name="l00107"></a>00107 {<a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_NETMASK0 &lt;&lt; 8) | UIP_NETMASK1),
<a name="l00108"></a>00108 <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_NETMASK2 &lt;&lt; 8) | UIP_NETMASK3)};
<a name="l00109"></a>00109 <span class="preprocessor">#else</span>
<a name="l00110"></a><a class="code" href="a00150.html#g3237be0d9ec457de0177689ee23c0d5c">00110</a> <span class="preprocessor"></span><a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>, <a class="code" href="a00150.html#g20df5c82f2a15a508c19e505b5d9de2b">uip_draddr</a>, uip_netmask;
<a name="l00111"></a>00111 <span class="preprocessor">#endif </span><span class="comment">/* UIP_FIXEDADDR */</span>
<a name="l00112"></a>00112
<a name="l00113"></a>00113 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> all_ones_addr =
<a name="l00114"></a>00114 <span class="preprocessor">#if UIP_CONF_IPV6</span>
<a name="l00115"></a>00115 <span class="preprocessor"></span> {0xffff,0xffff,0xffff,0xffff,0xffff,0xffff,0xffff,0xffff};
<a name="l00116"></a>00116 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00117"></a>00117 {0xffff,0xffff};
<a name="l00118"></a>00118 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00119"></a>00119 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> all_zeroes_addr =
<a name="l00120"></a>00120 <span class="preprocessor">#if UIP_CONF_IPV6</span>
<a name="l00121"></a>00121 <span class="preprocessor"></span> {0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000};
<a name="l00122"></a>00122 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00123"></a>00123 {0x0000,0x0000};
<a name="l00124"></a>00124 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00125"></a>00125
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="preprocessor">#if UIP_FIXEDETHADDR</span>
<a name="l00128"></a>00128 <span class="preprocessor"></span><span class="keyword">const</span> <span class="keyword">struct </span><a class="code" href="a00089.html">uip_eth_addr</a> <a class="code" href="a00150.html#g499bb98a0b4ae9a98553ede81317606d">uip_ethaddr</a> = {{UIP_ETHADDR0,
<a name="l00129"></a>00129 UIP_ETHADDR1,
<a name="l00130"></a>00130 UIP_ETHADDR2,
<a name="l00131"></a>00131 UIP_ETHADDR3,
<a name="l00132"></a>00132 UIP_ETHADDR4,
<a name="l00133"></a>00133 UIP_ETHADDR5}};
<a name="l00134"></a>00134 <span class="preprocessor">#else</span>
<a name="l00135"></a><a class="code" href="a00152.html#g499bb98a0b4ae9a98553ede81317606d">00135</a> <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00089.html">uip_eth_addr</a> <a class="code" href="a00150.html#g499bb98a0b4ae9a98553ede81317606d">uip_ethaddr</a> = {{0,0,0,0,0,0}};
<a name="l00136"></a>00136 <span class="preprocessor">#endif</span>
<a name="l00137"></a>00137 <span class="preprocessor"></span>
<a name="l00138"></a>00138 <span class="preprocessor">#ifndef UIP_CONF_EXTERNAL_BUFFER</span>
<a name="l00139"></a><a class="code" href="a00150.html#gb81e78f890dbbee50c533a9734b74fd9">00139</a> <span class="preprocessor"></span><a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> <a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00153.html#g3589822ecb9d9c4145209756396b8a6b">UIP_BUFSIZE</a> + 2]; <span class="comment">/* The packet buffer that contains</span>
<a name="l00140"></a>00140 <span class="comment"> incoming packets. */</span>
<a name="l00141"></a>00141 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_EXTERNAL_BUFFER */</span>
<a name="l00142"></a>00142
<a name="l00143"></a><a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">00143</a> <span class="keywordtype">void</span> *<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a>; <span class="comment">/* The uip_appdata pointer points to</span>
<a name="l00144"></a>00144 <span class="comment"> application data. */</span>
<a name="l00145"></a><a class="code" href="a00150.html#ga05a3dde2048480fa3ab2a5961898d18">00145</a> <span class="keywordtype">void</span> *<a class="code" href="a00150.html#ga05a3dde2048480fa3ab2a5961898d18">uip_sappdata</a>; <span class="comment">/* The uip_appdata pointer points to</span>
<a name="l00146"></a>00146 <span class="comment"> the application data which is to</span>
<a name="l00147"></a>00147 <span class="comment"> be sent. */</span>
<a name="l00148"></a>00148 <span class="preprocessor">#if UIP_URGDATA &gt; 0</span>
<a name="l00149"></a>00149 <span class="preprocessor"></span><span class="keywordtype">void</span> *uip_urgdata; <span class="comment">/* The uip_urgdata pointer points to</span>
<a name="l00150"></a>00150 <span class="comment"> urgent data (out-of-band data), if</span>
<a name="l00151"></a>00151 <span class="comment"> present. */</span>
<a name="l00152"></a>00152 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> uip_urglen, uip_surglen;
<a name="l00153"></a>00153 <span class="preprocessor">#endif </span><span class="comment">/* UIP_URGDATA &gt; 0 */</span>
<a name="l00154"></a>00154
<a name="l00155"></a><a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">00155</a> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>, <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a>;
<a name="l00156"></a>00156 <span class="comment">/* The uip_len is either 8 or 16 bits,</span>
<a name="l00157"></a>00157 <span class="comment"> depending on the maximum packet</span>
<a name="l00158"></a>00158 <span class="comment"> size. */</span>
<a name="l00159"></a>00159
<a name="l00160"></a><a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">00160</a> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a>; <span class="comment">/* The uip_flags variable is used for</span>
<a name="l00161"></a>00161 <span class="comment"> communication between the TCP/IP stack</span>
<a name="l00162"></a>00162 <span class="comment"> and the application program. */</span>
<a name="l00163"></a><a class="code" href="a00150.html#g788ffac72342f6172343d7f8099cbe1a">00163</a> <span class="keyword">struct </span><a class="code" href="a00088.html">uip_conn</a> *<a class="code" href="a00088.html">uip_conn</a>; <span class="comment">/* uip_conn always points to the current</span>
<a name="l00164"></a>00164 <span class="comment"> connection. */</span>
<a name="l00165"></a>00165
<a name="l00166"></a><a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">00166</a> <span class="keyword">struct </span><a class="code" href="a00150.html#g788ffac72342f6172343d7f8099cbe1a">uip_conn</a> <a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[<a class="code" href="a00153.html#gf5fe83be78b78b9e7d9e7f1e34ab1cc5">UIP_CONNS</a>];
<a name="l00167"></a>00167 <span class="comment">/* The uip_conns array holds all TCP</span>
<a name="l00168"></a>00168 <span class="comment"> connections. */</span>
<a name="l00169"></a><a class="code" href="a00150.html#g236d5c7872f59c8fe7b701c7252b976e">00169</a> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="a00150.html#g236d5c7872f59c8fe7b701c7252b976e">uip_listenports</a>[<a class="code" href="a00153.html#g8f4ebd8ef6c0ea665ed351d87fec09fd">UIP_LISTENPORTS</a>];
<a name="l00170"></a>00170 <span class="comment">/* The uip_listenports list all currently</span>
<a name="l00171"></a>00171 <span class="comment"> listning ports. */</span>
<a name="l00172"></a>00172 <span class="preprocessor">#if UIP_UDP</span>
<a name="l00173"></a><a class="code" href="a00150.html#g210f227119fc972e6222c9cb452e15a9">00173</a> <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00095.html">uip_udp_conn</a> *<a class="code" href="a00095.html">uip_udp_conn</a>;
<a name="l00174"></a><a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">00174</a> <span class="keyword">struct </span><a class="code" href="a00150.html#g210f227119fc972e6222c9cb452e15a9">uip_udp_conn</a> <a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">uip_udp_conns</a>[<a class="code" href="a00153.html#g196379ceb1219a99f4495e41ccc9bbfb">UIP_UDP_CONNS</a>];
<a name="l00175"></a>00175 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
<a name="l00176"></a>00176
<a name="l00177"></a>00177 <span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> ipid; <span class="comment">/* Ths ipid variable is an increasing</span>
<a name="l00178"></a>00178 <span class="comment"> number that is used for the IP ID</span>
<a name="l00179"></a>00179 <span class="comment"> field. */</span>
<a name="l00180"></a>00180
<a name="l00181"></a><a class="code" href="a00150.html#g22f140b02c354dfebcc7ad481c3bcd68">00181</a> <span class="keywordtype">void</span> <a class="code" href="a00145.html#g22f140b02c354dfebcc7ad481c3bcd68">uip_setipid</a>(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <span class="keywordtype">id</span>) { ipid = id; }
<a name="l00182"></a>00182
<a name="l00183"></a>00183 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> iss[4]; <span class="comment">/* The iss variable is used for the TCP</span>
<a name="l00184"></a>00184 <span class="comment"> initial sequence number. */</span>
<a name="l00185"></a>00185
<a name="l00186"></a>00186 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
<a name="l00187"></a>00187 <span class="preprocessor"></span><span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> lastport; <span class="comment">/* Keeps track of the last port used for</span>
<a name="l00188"></a>00188 <span class="comment"> a new connection. */</span>
<a name="l00189"></a>00189 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
<a name="l00190"></a>00190
<a name="l00191"></a>00191 <span class="comment">/* Temporary variables. */</span>
<a name="l00192"></a><a class="code" href="a00150.html#g2a0cf5d86c58fab216414ce59bf1fea1">00192</a> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[4];
<a name="l00193"></a>00193 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> c, opt;
<a name="l00194"></a>00194 <span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> tmp16;
<a name="l00195"></a>00195
<a name="l00196"></a>00196 <span class="comment">/* Structures and definitions. */</span>
<a name="l00197"></a><a class="code" href="a00150.html#g88e60aa2cf23e1c65d630701db08c743">00197</a> <span class="preprocessor">#define TCP_FIN 0x01</span>
<a name="l00198"></a><a class="code" href="a00150.html#g6020613f5062417d9811cfa837215c83">00198</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_SYN 0x02</span>
<a name="l00199"></a><a class="code" href="a00150.html#g5ca559def464ef20d8b1f7d32f2f160d">00199</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_RST 0x04</span>
<a name="l00200"></a><a class="code" href="a00150.html#g1320fd0006a2f70138bc2d0018dda829">00200</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_PSH 0x08</span>
<a name="l00201"></a><a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">00201</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_ACK 0x10</span>
<a name="l00202"></a><a class="code" href="a00150.html#gc84f499cba8a02fc0e306c10b2acabf0">00202</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_URG 0x20</span>
<a name="l00203"></a><a class="code" href="a00150.html#g1425d4a0c2760adb653a04c0fb137a8d">00203</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_CTL 0x3f</span>
<a name="l00204"></a>00204 <span class="preprocessor"></span>
<a name="l00205"></a><a class="code" href="a00150.html#g1215163245304bad20d6c5608ad75ab7">00205</a> <span class="preprocessor">#define TCP_OPT_END 0 </span><span class="comment">/* End of TCP options list */</span>
<a name="l00206"></a><a class="code" href="a00150.html#g9f1822e1d231235edacad691f3cb7bbb">00206</a> <span class="preprocessor">#define TCP_OPT_NOOP 1 </span><span class="comment">/* "No-operation" TCP option */</span>
<a name="l00207"></a><a class="code" href="a00150.html#g691688604655ea8943d15f14c60027d8">00207</a> <span class="preprocessor">#define TCP_OPT_MSS 2 </span><span class="comment">/* Maximum segment size TCP option */</span>
<a name="l00208"></a>00208
<a name="l00209"></a><a class="code" href="a00150.html#g12f3bf821224b8e7b48a57ed3cea15cf">00209</a> <span class="preprocessor">#define TCP_OPT_MSS_LEN 4 </span><span class="comment">/* Length of TCP MSS option. */</span>
<a name="l00210"></a>00210
<a name="l00211"></a><a class="code" href="a00150.html#g5c5b1834e497f53ad0ef947bbe9777fa">00211</a> <span class="preprocessor">#define ICMP_ECHO_REPLY 0</span>
<a name="l00212"></a><a class="code" href="a00150.html#gd58231410d58e34b455328b888a9e73c">00212</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMP_ECHO 8</span>
<a name="l00213"></a>00213 <span class="preprocessor"></span>
<a name="l00214"></a><a class="code" href="a00150.html#g207d17b633cd095120a74bc1f2257b17">00214</a> <span class="preprocessor">#define ICMP6_ECHO_REPLY 129</span>
<a name="l00215"></a><a class="code" href="a00150.html#g4cc3e223b63f27b546d62e9a258dba5a">00215</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_ECHO 128</span>
<a name="l00216"></a><a class="code" href="a00150.html#g1cea57e3ea526f210b1068e6dcf7b4f4">00216</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_NEIGHBOR_SOLICITATION 135</span>
<a name="l00217"></a><a class="code" href="a00150.html#g62c03e0a308cc23929a80fe8d8f9dc1e">00217</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_NEIGHBOR_ADVERTISEMENT 136</span>
<a name="l00218"></a>00218 <span class="preprocessor"></span>
<a name="l00219"></a><a class="code" href="a00150.html#g1d3211dbbdfb22d6a47b60dddcf945e8">00219</a> <span class="preprocessor">#define ICMP6_FLAG_S (1 &lt;&lt; 6)</span>
<a name="l00220"></a>00220 <span class="preprocessor"></span>
<a name="l00221"></a><a class="code" href="a00150.html#g42288d5c3cf4b10becefec657f441e54">00221</a> <span class="preprocessor">#define ICMP6_OPTION_SOURCE_LINK_ADDRESS 1</span>
<a name="l00222"></a><a class="code" href="a00150.html#g8387881de3a8bfd3c0d57b9d04ac9b7e">00222</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_OPTION_TARGET_LINK_ADDRESS 2</span>
<a name="l00223"></a>00223 <span class="preprocessor"></span>
<a name="l00224"></a>00224
<a name="l00225"></a>00225 <span class="comment">/* Macros. */</span>
<a name="l00226"></a><a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">00226</a> <span class="preprocessor">#define BUF ((struct uip_tcpip_hdr *)&amp;uip_buf[UIP_LLH_LEN])</span>
<a name="l00227"></a><a class="code" href="a00150.html#g96544dedc1cdc71ad2ad54bf1d5e5433">00227</a> <span class="preprocessor"></span><span class="preprocessor">#define FBUF ((struct uip_tcpip_hdr *)&amp;uip_reassbuf[0])</span>
<a name="l00228"></a><a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">00228</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMPBUF ((struct uip_icmpip_hdr *)&amp;uip_buf[UIP_LLH_LEN])</span>
<a name="l00229"></a><a class="code" href="a00150.html#gb9435261753469accec0c9bf8a5a2686">00229</a> <span class="preprocessor"></span><span class="preprocessor">#define UDPBUF ((struct uip_udpip_hdr *)&amp;uip_buf[UIP_LLH_LEN])</span>
<a name="l00230"></a>00230 <span class="preprocessor"></span>
<a name="l00231"></a>00231
<a name="l00232"></a>00232 <span class="preprocessor">#if UIP_STATISTICS == 1</span>
<a name="l00233"></a>00233 <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00093.html">uip_stats</a> <a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>;
<a name="l00234"></a>00234 <span class="preprocessor">#define UIP_STAT(s) s</span>
<a name="l00235"></a>00235 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00236"></a><a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">00236</a> <span class="preprocessor"></span><span class="preprocessor">#define UIP_STAT(s)</span>
<a name="l00237"></a>00237 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* UIP_STATISTICS == 1 */</span>
<a name="l00238"></a>00238
<a name="l00239"></a>00239 <span class="preprocessor">#if UIP_LOGGING == 1</span>
<a name="l00240"></a>00240 <span class="preprocessor"></span><span class="preprocessor">#include &lt;stdio.h&gt;</span>
<a name="l00241"></a>00241 <span class="keywordtype">void</span> <a class="code" href="a00153.html#gb58e1ceb7cb73ca2bcd73146b6c1b4e7">uip_log</a>(<span class="keywordtype">char</span> *msg);
<a name="l00242"></a>00242 <span class="preprocessor">#define UIP_LOG(m) uip_log(m)</span>
<a name="l00243"></a>00243 <span class="preprocessor"></span><span class="preprocessor">#else</span>
<a name="l00244"></a><a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">00244</a> <span class="preprocessor"></span><span class="preprocessor">#define UIP_LOG(m)</span>
<a name="l00245"></a>00245 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* UIP_LOGGING == 1 */</span>
<a name="l00246"></a>00246
<a name="l00247"></a>00247 <span class="preprocessor">#if ! UIP_ARCH_ADD32</span>
<a name="l00248"></a>00248 <span class="preprocessor"></span><span class="keywordtype">void</span>
<a name="l00249"></a><a class="code" href="a00151.html#g6832e4d2d046536b6472f7ac92340f68">00249</a> <a class="code" href="a00150.html#g6832e4d2d046536b6472f7ac92340f68">uip_add32</a>(<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *op32, <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> op16)
<a name="l00250"></a>00250 {
<a name="l00251"></a>00251 uip_acc32[3] = op32[3] + (op16 &amp; 0xff);
<a name="l00252"></a>00252 uip_acc32[2] = op32[2] + (op16 &gt;&gt; 8);
<a name="l00253"></a>00253 uip_acc32[1] = op32[1];
<a name="l00254"></a>00254 uip_acc32[0] = op32[0];
<a name="l00255"></a>00255
<a name="l00256"></a>00256 <span class="keywordflow">if</span>(uip_acc32[2] &lt; (op16 &gt;&gt; 8)) {
<a name="l00257"></a>00257 ++uip_acc32[1];
<a name="l00258"></a>00258 <span class="keywordflow">if</span>(uip_acc32[1] == 0) {
<a name="l00259"></a>00259 ++uip_acc32[0];
<a name="l00260"></a>00260 }
<a name="l00261"></a>00261 }
<a name="l00262"></a>00262
<a name="l00263"></a>00263
<a name="l00264"></a>00264 <span class="keywordflow">if</span>(uip_acc32[3] &lt; (op16 &amp; 0xff)) {
<a name="l00265"></a>00265 ++uip_acc32[2];
<a name="l00266"></a>00266 <span class="keywordflow">if</span>(uip_acc32[2] == 0) {
<a name="l00267"></a>00267 ++uip_acc32[1];
<a name="l00268"></a>00268 <span class="keywordflow">if</span>(uip_acc32[1] == 0) {
<a name="l00269"></a>00269 ++uip_acc32[0];
<a name="l00270"></a>00270 }
<a name="l00271"></a>00271 }
<a name="l00272"></a>00272 }
<a name="l00273"></a>00273 }
<a name="l00274"></a>00274
<a name="l00275"></a>00275 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ARCH_ADD32 */</span>
<a name="l00276"></a>00276
<a name="l00277"></a>00277 <span class="preprocessor">#if ! UIP_ARCH_CHKSUM</span>
<a name="l00278"></a>00278 <span class="preprocessor"></span><span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00279"></a>00279 <span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
<a name="l00280"></a>00280 chksum(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> sum, <span class="keyword">const</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *data, <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> len)
<a name="l00281"></a>00281 {
<a name="l00282"></a>00282 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> t;
<a name="l00283"></a>00283 <span class="keyword">const</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *dataptr;
<a name="l00284"></a>00284 <span class="keyword">const</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *last_byte;
<a name="l00285"></a>00285
<a name="l00286"></a>00286 dataptr = data;
<a name="l00287"></a>00287 last_byte = data + len - 1;
<a name="l00288"></a>00288
<a name="l00289"></a>00289 <span class="keywordflow">while</span>(dataptr &lt; last_byte) { <span class="comment">/* At least two more bytes */</span>
<a name="l00290"></a>00290 t = (dataptr[0] &lt;&lt; 8) + dataptr[1];
<a name="l00291"></a>00291 sum += t;
<a name="l00292"></a>00292 <span class="keywordflow">if</span>(sum &lt; t) {
<a name="l00293"></a>00293 sum++; <span class="comment">/* carry */</span>
<a name="l00294"></a>00294 }
<a name="l00295"></a>00295 dataptr += 2;
<a name="l00296"></a>00296 }
<a name="l00297"></a>00297
<a name="l00298"></a>00298 <span class="keywordflow">if</span>(dataptr == last_byte) {
<a name="l00299"></a>00299 t = (dataptr[0] &lt;&lt; 8) + 0;
<a name="l00300"></a>00300 sum += t;
<a name="l00301"></a>00301 <span class="keywordflow">if</span>(sum &lt; t) {
<a name="l00302"></a>00302 sum++; <span class="comment">/* carry */</span>
<a name="l00303"></a>00303 }
<a name="l00304"></a>00304 }
<a name="l00305"></a>00305
<a name="l00306"></a>00306 <span class="comment">/* Return sum in host byte order. */</span>
<a name="l00307"></a>00307 <span class="keywordflow">return</span> sum;
<a name="l00308"></a>00308 }
<a name="l00309"></a>00309 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00310"></a>00310 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
<a name="l00311"></a><a class="code" href="a00150.html#gb6683dd83fe1c8de9a24086d4b69e907">00311</a> <a class="code" href="a00150.html#gb6683dd83fe1c8de9a24086d4b69e907">uip_chksum</a>(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> *data, <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> len)
<a name="l00312"></a>00312 {
<a name="l00313"></a>00313 <span class="keywordflow">return</span> <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(chksum(0, (<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)data, len));
<a name="l00314"></a>00314 }
<a name="l00315"></a>00315 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00316"></a>00316 <span class="preprocessor">#ifndef UIP_ARCH_IPCHKSUM</span>
<a name="l00317"></a>00317 <span class="preprocessor"></span><a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
<a name="l00318"></a><a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">00318</a> <a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>(<span class="keywordtype">void</span>)
<a name="l00319"></a>00319 {
<a name="l00320"></a>00320 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> sum;
<a name="l00321"></a>00321
<a name="l00322"></a>00322 sum = chksum(0, &amp;uip_buf[<a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a>], <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>);
<a name="l00323"></a>00323 <a class="code" href="a00135.html#534d9e416324fb8ecca6b9cb4b1f6a6a">DEBUG_PRINTF</a>(<span class="stringliteral">"uip_ipchksum: sum 0x%04x\n"</span>, sum);
<a name="l00324"></a>00324 <span class="keywordflow">return</span> (sum == 0) ? 0xffff : <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(sum);
<a name="l00325"></a>00325 }
<a name="l00326"></a>00326 <span class="preprocessor">#endif</span>
<a name="l00327"></a>00327 <span class="preprocessor"></span><span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00328"></a>00328 <span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
<a name="l00329"></a>00329 upper_layer_chksum(<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto)
<a name="l00330"></a>00330 {
<a name="l00331"></a>00331 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> upper_layer_len;
<a name="l00332"></a>00332 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> sum;
<a name="l00333"></a>00333
<a name="l00334"></a>00334 <span class="preprocessor">#if UIP_CONF_IPV6</span>
<a name="l00335"></a>00335 <span class="preprocessor"></span> upper_layer_len = (((<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>)(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0]) &lt;&lt; 8) + <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1]);
<a name="l00336"></a>00336 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00337"></a>00337 upper_layer_len = (((<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>)(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0]) &lt;&lt; 8) + <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1]) - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>;
<a name="l00338"></a>00338 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00339"></a>00339
<a name="l00340"></a>00340 <span class="comment">/* First sum pseudoheader. */</span>
<a name="l00341"></a>00341
<a name="l00342"></a>00342 <span class="comment">/* IP protocol and length fields. This addition cannot carry. */</span>
<a name="l00343"></a>00343 sum = upper_layer_len + proto;
<a name="l00344"></a>00344 <span class="comment">/* Sum IP source and destination addresses. */</span>
<a name="l00345"></a>00345 sum = chksum(sum, (<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)&amp;<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr[0], 2 * <span class="keyword">sizeof</span>(<a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a>));
<a name="l00346"></a>00346
<a name="l00347"></a>00347 <span class="comment">/* Sum TCP header and data. */</span>
<a name="l00348"></a>00348 sum = chksum(sum, &amp;uip_buf[<a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a>],
<a name="l00349"></a>00349 upper_layer_len);
<a name="l00350"></a>00350
<a name="l00351"></a>00351 <span class="keywordflow">return</span> (sum == 0) ? 0xffff : <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(sum);
<a name="l00352"></a>00352 }
<a name="l00353"></a>00353 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00354"></a>00354 <span class="preprocessor">#if UIP_CONF_IPV6</span>
<a name="l00355"></a>00355 <span class="preprocessor"></span><a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
<a name="l00356"></a>00356 uip_icmp6chksum(<span class="keywordtype">void</span>)
<a name="l00357"></a>00357 {
<a name="l00358"></a>00358 <span class="keywordflow">return</span> upper_layer_chksum(<a class="code" href="a00150.html#gad0321f4c570f9983c6de81ece3ddc20">UIP_PROTO_ICMP6</a>);
<a name="l00359"></a>00359
<a name="l00360"></a>00360 }
<a name="l00361"></a>00361 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00362"></a>00362 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00363"></a>00363 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
<a name="l00364"></a><a class="code" href="a00150.html#g85b65e38aa74eba18979156f97a94a87">00364</a> <a class="code" href="a00150.html#g85b65e38aa74eba18979156f97a94a87">uip_tcpchksum</a>(<span class="keywordtype">void</span>)
<a name="l00365"></a>00365 {
<a name="l00366"></a>00366 <span class="keywordflow">return</span> upper_layer_chksum(<a class="code" href="a00150.html#g517c770991459cc62dc009c0d3875c6a">UIP_PROTO_TCP</a>);
<a name="l00367"></a>00367 }
<a name="l00368"></a>00368 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00369"></a>00369 <span class="preprocessor">#if UIP_UDP_CHECKSUMS</span>
<a name="l00370"></a>00370 <span class="preprocessor"></span><a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
<a name="l00371"></a>00371 <a class="code" href="a00150.html#g7023a34ba9e9d03b5fbedbcb32924453">uip_udpchksum</a>(<span class="keywordtype">void</span>)
<a name="l00372"></a>00372 {
<a name="l00373"></a>00373 <span class="keywordflow">return</span> upper_layer_chksum(<a class="code" href="a00150.html#gf72d7b9a737707dcfb2c41fec2b6792e">UIP_PROTO_UDP</a>);
<a name="l00374"></a>00374 }
<a name="l00375"></a>00375 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
<a name="l00376"></a>00376 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ARCH_CHKSUM */</span>
<a name="l00377"></a>00377 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00378"></a>00378 <span class="keywordtype">void</span>
<a name="l00379"></a><a class="code" href="a00150.html#gc48ed5f0d27721ef62a3ed02a5ad8d2e">00379</a> <a class="code" href="a00145.html#gc48ed5f0d27721ef62a3ed02a5ad8d2e">uip_init</a>(<span class="keywordtype">void</span>)
<a name="l00380"></a>00380 {
<a name="l00381"></a>00381 <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#g8f4ebd8ef6c0ea665ed351d87fec09fd">UIP_LISTENPORTS</a>; ++c) {
<a name="l00382"></a>00382 uip_listenports[c] = 0;
<a name="l00383"></a>00383 }
<a name="l00384"></a>00384 <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#gf5fe83be78b78b9e7d9e7f1e34ab1cc5">UIP_CONNS</a>; ++c) {
<a name="l00385"></a>00385 <a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[c].tcpstateflags = <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>;
<a name="l00386"></a>00386 }
<a name="l00387"></a>00387 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
<a name="l00388"></a>00388 <span class="preprocessor"></span> lastport = 1024;
<a name="l00389"></a>00389 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
<a name="l00390"></a>00390
<a name="l00391"></a>00391 <span class="preprocessor">#if UIP_UDP</span>
<a name="l00392"></a>00392 <span class="preprocessor"></span> <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#g196379ceb1219a99f4495e41ccc9bbfb">UIP_UDP_CONNS</a>; ++c) {
<a name="l00393"></a>00393 <a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">uip_udp_conns</a>[c].lport = 0;
<a name="l00394"></a>00394 }
<a name="l00395"></a>00395 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
<a name="l00396"></a>00396
<a name="l00397"></a>00397
<a name="l00398"></a>00398 <span class="comment">/* IPv4 initialization. */</span>
<a name="l00399"></a>00399 <span class="preprocessor">#if UIP_FIXEDADDR == 0</span>
<a name="l00400"></a>00400 <span class="preprocessor"></span> <span class="comment">/* uip_hostaddr[0] = uip_hostaddr[1] = 0;*/</span>
<a name="l00401"></a>00401 <span class="preprocessor">#endif </span><span class="comment">/* UIP_FIXEDADDR */</span>
<a name="l00402"></a>00402
<a name="l00403"></a>00403 }
<a name="l00404"></a>00404 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00405"></a>00405 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
<a name="l00406"></a>00406 <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00150.html#g788ffac72342f6172343d7f8099cbe1a">uip_conn</a> *
<a name="l00407"></a><a class="code" href="a00150.html#g9c24fba2cd8f7f62accb0a0d5bbe4dad">00407</a> <a class="code" href="a00147.html#g8096b0c4b543dc408f4dd031ddae7240">uip_connect</a>(<a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> *<a class="code" href="a00088.html#79510aa86d3fa0a0fc6cfc49b1da7279">ripaddr</a>, <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="a00088.html#1df6aa054ef2fa634ac4c6f418228285">rport</a>)
<a name="l00408"></a>00408 {
<a name="l00409"></a>00409 <span class="keyword">register</span> <span class="keyword">struct </span><a class="code" href="a00150.html#g788ffac72342f6172343d7f8099cbe1a">uip_conn</a> *conn, *cconn;
<a name="l00410"></a>00410
<a name="l00411"></a>00411 <span class="comment">/* Find an unused local port. */</span>
<a name="l00412"></a>00412 again:
<a name="l00413"></a>00413 ++lastport;
<a name="l00414"></a>00414
<a name="l00415"></a>00415 <span class="keywordflow">if</span>(lastport &gt;= 32000) {
<a name="l00416"></a>00416 lastport = 4096;
<a name="l00417"></a>00417 }
<a name="l00418"></a>00418
<a name="l00419"></a>00419 <span class="comment">/* Check if this port is already in use, and if so try to find</span>
<a name="l00420"></a>00420 <span class="comment"> another one. */</span>
<a name="l00421"></a>00421 <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#gf5fe83be78b78b9e7d9e7f1e34ab1cc5">UIP_CONNS</a>; ++c) {
<a name="l00422"></a>00422 conn = &amp;<a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[c];
<a name="l00423"></a>00423 <span class="keywordflow">if</span>(conn-&gt;<a class="code" href="a00088.html#a5f58074435cdc180f17de69651beebd">tcpstateflags</a> != <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a> &amp;&amp;
<a name="l00424"></a>00424 conn-&gt;<a class="code" href="a00088.html#0cd09beee671e7e9efb0b4aced10249e">lport</a> == <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(lastport)) {
<a name="l00425"></a>00425 <span class="keywordflow">goto</span> again;
<a name="l00426"></a>00426 }
<a name="l00427"></a>00427 }
<a name="l00428"></a>00428
<a name="l00429"></a>00429 conn = 0;
<a name="l00430"></a>00430 <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#gf5fe83be78b78b9e7d9e7f1e34ab1cc5">UIP_CONNS</a>; ++c) {
<a name="l00431"></a>00431 cconn = &amp;<a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[c];
<a name="l00432"></a>00432 <span class="keywordflow">if</span>(cconn-&gt;tcpstateflags == <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>) {
<a name="l00433"></a>00433 conn = cconn;
<a name="l00434"></a>00434 <span class="keywordflow">break</span>;
<a name="l00435"></a>00435 }
<a name="l00436"></a>00436 <span class="keywordflow">if</span>(cconn-&gt;tcpstateflags == <a class="code" href="a00150.html#gfff0ed43201bf1e2020de1a0d6cac070">UIP_TIME_WAIT</a>) {
<a name="l00437"></a>00437 <span class="keywordflow">if</span>(conn == 0 ||
<a name="l00438"></a>00438 cconn-&gt;timer &gt; conn-&gt;timer) {
<a name="l00439"></a>00439 conn = cconn;
<a name="l00440"></a>00440 }
<a name="l00441"></a>00441 }
<a name="l00442"></a>00442 }
<a name="l00443"></a>00443
<a name="l00444"></a>00444 <span class="keywordflow">if</span>(conn == 0) {
<a name="l00445"></a>00445 <span class="keywordflow">return</span> 0;
<a name="l00446"></a>00446 }
<a name="l00447"></a>00447
<a name="l00448"></a>00448 conn-&gt;<a class="code" href="a00088.html#a5f58074435cdc180f17de69651beebd">tcpstateflags</a> = <a class="code" href="a00150.html#g8af482dec973db57d8b3bd3f69461488">UIP_SYN_SENT</a>;
<a name="l00449"></a>00449
<a name="l00450"></a>00450 conn-&gt;snd_nxt[0] = iss[0];
<a name="l00451"></a>00451 conn-&gt;snd_nxt[1] = iss[1];
<a name="l00452"></a>00452 conn-&gt;snd_nxt[2] = iss[2];
<a name="l00453"></a>00453 conn-&gt;snd_nxt[3] = iss[3];
<a name="l00454"></a>00454
<a name="l00455"></a>00455 conn-&gt;initialmss = conn-&gt;mss = <a class="code" href="a00153.html#g4910467b83a639f06739c82cd362037e">UIP_TCP_MSS</a>;
<a name="l00456"></a>00456
<a name="l00457"></a>00457 conn-&gt;len = 1; <span class="comment">/* TCP length of the SYN is one. */</span>
<a name="l00458"></a>00458 conn-&gt;nrtx = 0;
<a name="l00459"></a>00459 conn-&gt;timer = 1; <span class="comment">/* Send the SYN next time around. */</span>
<a name="l00460"></a>00460 conn-&gt;rto = <a class="code" href="a00153.html#g15de27b044603284f68db05a378235a7">UIP_RTO</a>;
<a name="l00461"></a>00461 conn-&gt;sa = 0;
<a name="l00462"></a>00462 conn-&gt;sv = 16; <span class="comment">/* Initial value of the RTT variance. */</span>
<a name="l00463"></a>00463 conn-&gt;lport = <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(lastport);
<a name="l00464"></a>00464 conn-&gt;rport = <a class="code" href="a00088.html#1df6aa054ef2fa634ac4c6f418228285">rport</a>;
<a name="l00465"></a>00465 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(&amp;conn-&gt;ripaddr, <a class="code" href="a00088.html#79510aa86d3fa0a0fc6cfc49b1da7279">ripaddr</a>);
<a name="l00466"></a>00466
<a name="l00467"></a>00467 <span class="keywordflow">return</span> conn;
<a name="l00468"></a>00468 }
<a name="l00469"></a>00469 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
<a name="l00470"></a>00470 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00471"></a>00471 <span class="preprocessor">#if UIP_UDP</span>
<a name="l00472"></a>00472 <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00150.html#g210f227119fc972e6222c9cb452e15a9">uip_udp_conn</a> *
<a name="l00473"></a><a class="code" href="a00150.html#g79c4110211247df3fb30b8cf1c4c02af">00473</a> <a class="code" href="a00147.html#g79c4110211247df3fb30b8cf1c4c02af">uip_udp_new</a>(<a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> *<a class="code" href="a00095.html#8a661a2d544100b82d0d14a1985083d5">ripaddr</a>, <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="a00095.html#280a0c2a93544e597f92bbacf36ee1dc">rport</a>)
<a name="l00474"></a>00474 {
<a name="l00475"></a>00475 <span class="keyword">register</span> <span class="keyword">struct </span><a class="code" href="a00150.html#g210f227119fc972e6222c9cb452e15a9">uip_udp_conn</a> *conn;
<a name="l00476"></a>00476
<a name="l00477"></a>00477 <span class="comment">/* Find an unused local port. */</span>
<a name="l00478"></a>00478 again:
<a name="l00479"></a>00479 ++lastport;
<a name="l00480"></a>00480
<a name="l00481"></a>00481 <span class="keywordflow">if</span>(lastport &gt;= 32000) {
<a name="l00482"></a>00482 lastport = 4096;
<a name="l00483"></a>00483 }
<a name="l00484"></a>00484
<a name="l00485"></a>00485 <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#g196379ceb1219a99f4495e41ccc9bbfb">UIP_UDP_CONNS</a>; ++c) {
<a name="l00486"></a>00486 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">uip_udp_conns</a>[c].<a class="code" href="a00095.html#981392e295db4d024eea95805c51c371">lport</a> == <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(lastport)) {
<a name="l00487"></a>00487 <span class="keywordflow">goto</span> again;
<a name="l00488"></a>00488 }
<a name="l00489"></a>00489 }
<a name="l00490"></a>00490
<a name="l00491"></a>00491
<a name="l00492"></a>00492 conn = 0;
<a name="l00493"></a>00493 <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#g196379ceb1219a99f4495e41ccc9bbfb">UIP_UDP_CONNS</a>; ++c) {
<a name="l00494"></a>00494 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">uip_udp_conns</a>[c].<a class="code" href="a00095.html#981392e295db4d024eea95805c51c371">lport</a> == 0) {
<a name="l00495"></a>00495 conn = &amp;<a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">uip_udp_conns</a>[c];
<a name="l00496"></a>00496 <span class="keywordflow">break</span>;
<a name="l00497"></a>00497 }
<a name="l00498"></a>00498 }
<a name="l00499"></a>00499
<a name="l00500"></a>00500 <span class="keywordflow">if</span>(conn == 0) {
<a name="l00501"></a>00501 <span class="keywordflow">return</span> 0;
<a name="l00502"></a>00502 }
<a name="l00503"></a>00503
<a name="l00504"></a>00504 conn-&gt;<a class="code" href="a00095.html#981392e295db4d024eea95805c51c371">lport</a> = <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(lastport);
<a name="l00505"></a>00505 conn-&gt;rport = <a class="code" href="a00095.html#280a0c2a93544e597f92bbacf36ee1dc">rport</a>;
<a name="l00506"></a>00506 <span class="keywordflow">if</span>(<a class="code" href="a00095.html#8a661a2d544100b82d0d14a1985083d5">ripaddr</a> == <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {
<a name="l00507"></a>00507 memset(conn-&gt;ripaddr, 0, <span class="keyword">sizeof</span>(<a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a>));
<a name="l00508"></a>00508 } <span class="keywordflow">else</span> {
<a name="l00509"></a>00509 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(&amp;conn-&gt;ripaddr, <a class="code" href="a00095.html#8a661a2d544100b82d0d14a1985083d5">ripaddr</a>);
<a name="l00510"></a>00510 }
<a name="l00511"></a>00511 conn-&gt;ttl = <a class="code" href="a00153.html#gb61381673de27f31848c5396bf0b338e">UIP_TTL</a>;
<a name="l00512"></a>00512
<a name="l00513"></a>00513 <span class="keywordflow">return</span> conn;
<a name="l00514"></a>00514 }
<a name="l00515"></a>00515 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
<a name="l00516"></a>00516 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00517"></a>00517 <span class="keywordtype">void</span>
<a name="l00518"></a><a class="code" href="a00150.html#gaa585784b0914cac1d37f07f85457008">00518</a> <a class="code" href="a00147.html#gaa585784b0914cac1d37f07f85457008">uip_unlisten</a>(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> port)
<a name="l00519"></a>00519 {
<a name="l00520"></a>00520 <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#g8f4ebd8ef6c0ea665ed351d87fec09fd">UIP_LISTENPORTS</a>; ++c) {
<a name="l00521"></a>00521 <span class="keywordflow">if</span>(uip_listenports[c] == port) {
<a name="l00522"></a>00522 uip_listenports[c] = 0;
<a name="l00523"></a>00523 <span class="keywordflow">return</span>;
<a name="l00524"></a>00524 }
<a name="l00525"></a>00525 }
<a name="l00526"></a>00526 }
<a name="l00527"></a>00527 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00528"></a>00528 <span class="keywordtype">void</span>
<a name="l00529"></a><a class="code" href="a00150.html#gdd1ab3704ecd4900eec61a6897d32dc8">00529</a> <a class="code" href="a00147.html#gdd1ab3704ecd4900eec61a6897d32dc8">uip_listen</a>(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> port)
<a name="l00530"></a>00530 {
<a name="l00531"></a>00531 <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#g8f4ebd8ef6c0ea665ed351d87fec09fd">UIP_LISTENPORTS</a>; ++c) {
<a name="l00532"></a>00532 <span class="keywordflow">if</span>(uip_listenports[c] == 0) {
<a name="l00533"></a>00533 uip_listenports[c] = port;
<a name="l00534"></a>00534 <span class="keywordflow">return</span>;
<a name="l00535"></a>00535 }
<a name="l00536"></a>00536 }
<a name="l00537"></a>00537 }
<a name="l00538"></a>00538 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00539"></a>00539 <span class="comment">/* XXX: IP fragment reassembly: not well-tested. */</span>
<a name="l00540"></a>00540
<a name="l00541"></a>00541 <span class="preprocessor">#if UIP_REASSEMBLY &amp;&amp; !UIP_CONF_IPV6</span>
<a name="l00542"></a>00542 <span class="preprocessor"></span><span class="preprocessor">#define UIP_REASS_BUFSIZE (UIP_BUFSIZE - UIP_LLH_LEN)</span>
<a name="l00543"></a>00543 <span class="preprocessor"></span><span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> uip_reassbuf[UIP_REASS_BUFSIZE];
<a name="l00544"></a>00544 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> uip_reassbitmap[UIP_REASS_BUFSIZE / (8 * 8)];
<a name="l00545"></a>00545 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> bitmap_bits[8] = {0xff, 0x7f, 0x3f, 0x1f,
<a name="l00546"></a>00546 0x0f, 0x07, 0x03, 0x01};
<a name="l00547"></a>00547 <span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> uip_reasslen;
<a name="l00548"></a>00548 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> uip_reassflags;
<a name="l00549"></a>00549 <span class="preprocessor">#define UIP_REASS_FLAG_LASTFRAG 0x01</span>
<a name="l00550"></a>00550 <span class="preprocessor"></span><span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> uip_reasstmr;
<a name="l00551"></a>00551
<a name="l00552"></a>00552 <span class="preprocessor">#define IP_MF 0x20</span>
<a name="l00553"></a>00553 <span class="preprocessor"></span>
<a name="l00554"></a>00554 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>
<a name="l00555"></a>00555 uip_reass(<span class="keywordtype">void</span>)
<a name="l00556"></a>00556 {
<a name="l00557"></a>00557 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> offset, len;
<a name="l00558"></a>00558 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> i;
<a name="l00559"></a>00559
<a name="l00560"></a>00560 <span class="comment">/* If ip_reasstmr is zero, no packet is present in the buffer, so we</span>
<a name="l00561"></a>00561 <span class="comment"> write the IP header of the fragment into the reassembly</span>
<a name="l00562"></a>00562 <span class="comment"> buffer. The timer is updated with the maximum age. */</span>
<a name="l00563"></a>00563 <span class="keywordflow">if</span>(uip_reasstmr == 0) {
<a name="l00564"></a>00564 memcpy(uip_reassbuf, &amp;<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;vhl, <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>);
<a name="l00565"></a>00565 uip_reasstmr = <a class="code" href="a00153.html#gc3882366feda1cb759ccbfe98327a7db">UIP_REASS_MAXAGE</a>;
<a name="l00566"></a>00566 uip_reassflags = 0;
<a name="l00567"></a>00567 <span class="comment">/* Clear the bitmap. */</span>
<a name="l00568"></a>00568 memset(uip_reassbitmap, 0, <span class="keyword">sizeof</span>(uip_reassbitmap));
<a name="l00569"></a>00569 }
<a name="l00570"></a>00570
<a name="l00571"></a>00571 <span class="comment">/* Check if the incoming fragment matches the one currently present</span>
<a name="l00572"></a>00572 <span class="comment"> in the reasembly buffer. If so, we proceed with copying the</span>
<a name="l00573"></a>00573 <span class="comment"> fragment into the buffer. */</span>
<a name="l00574"></a>00574 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr[0] == <a class="code" href="a00150.html#g96544dedc1cdc71ad2ad54bf1d5e5433">FBUF</a>-&gt;srcipaddr[0] &amp;&amp;
<a name="l00575"></a>00575 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr[1] == <a class="code" href="a00150.html#g96544dedc1cdc71ad2ad54bf1d5e5433">FBUF</a>-&gt;srcipaddr[1] &amp;&amp;
<a name="l00576"></a>00576 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr[0] == <a class="code" href="a00150.html#g96544dedc1cdc71ad2ad54bf1d5e5433">FBUF</a>-&gt;destipaddr[0] &amp;&amp;
<a name="l00577"></a>00577 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr[1] == <a class="code" href="a00150.html#g96544dedc1cdc71ad2ad54bf1d5e5433">FBUF</a>-&gt;destipaddr[1] &amp;&amp;
<a name="l00578"></a>00578 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipid[0] == <a class="code" href="a00150.html#g96544dedc1cdc71ad2ad54bf1d5e5433">FBUF</a>-&gt;ipid[0] &amp;&amp;
<a name="l00579"></a>00579 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipid[1] == <a class="code" href="a00150.html#g96544dedc1cdc71ad2ad54bf1d5e5433">FBUF</a>-&gt;ipid[1]) {
<a name="l00580"></a>00580
<a name="l00581"></a>00581 len = (<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] &lt;&lt; 8) + <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] - (<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;vhl &amp; 0x0f) * 4;
<a name="l00582"></a>00582 offset = (((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipoffset[0] &amp; 0x3f) &lt;&lt; 8) + <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipoffset[1]) * 8;
<a name="l00583"></a>00583
<a name="l00584"></a>00584 <span class="comment">/* If the offset or the offset + fragment length overflows the</span>
<a name="l00585"></a>00585 <span class="comment"> reassembly buffer, we discard the entire packet. */</span>
<a name="l00586"></a>00586 <span class="keywordflow">if</span>(offset &gt; UIP_REASS_BUFSIZE ||
<a name="l00587"></a>00587 offset + len &gt; UIP_REASS_BUFSIZE) {
<a name="l00588"></a>00588 uip_reasstmr = 0;
<a name="l00589"></a>00589 <span class="keywordflow">goto</span> nullreturn;
<a name="l00590"></a>00590 }
<a name="l00591"></a>00591
<a name="l00592"></a>00592 <span class="comment">/* Copy the fragment into the reassembly buffer, at the right</span>
<a name="l00593"></a>00593 <span class="comment"> offset. */</span>
<a name="l00594"></a>00594 memcpy(&amp;uip_reassbuf[<a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a> + offset],
<a name="l00595"></a>00595 (<span class="keywordtype">char</span> *)<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a> + (<span class="keywordtype">int</span>)((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;vhl &amp; 0x0f) * 4),
<a name="l00596"></a>00596 len);
<a name="l00597"></a>00597
<a name="l00598"></a>00598 <span class="comment">/* Update the bitmap. */</span>
<a name="l00599"></a>00599 <span class="keywordflow">if</span>(offset / (8 * 8) == (offset + len) / (8 * 8)) {
<a name="l00600"></a>00600 <span class="comment">/* If the two endpoints are in the same byte, we only update</span>
<a name="l00601"></a>00601 <span class="comment"> that byte. */</span>
<a name="l00602"></a>00602
<a name="l00603"></a>00603 uip_reassbitmap[offset / (8 * 8)] |=
<a name="l00604"></a>00604 bitmap_bits[(offset / 8 ) &amp; 7] &amp;
<a name="l00605"></a>00605 ~bitmap_bits[((offset + len) / 8 ) &amp; 7];
<a name="l00606"></a>00606 } <span class="keywordflow">else</span> {
<a name="l00607"></a>00607 <span class="comment">/* If the two endpoints are in different bytes, we update the</span>
<a name="l00608"></a>00608 <span class="comment"> bytes in the endpoints and fill the stuff inbetween with</span>
<a name="l00609"></a>00609 <span class="comment"> 0xff. */</span>
<a name="l00610"></a>00610 uip_reassbitmap[offset / (8 * 8)] |=
<a name="l00611"></a>00611 bitmap_bits[(offset / 8 ) &amp; 7];
<a name="l00612"></a>00612 <span class="keywordflow">for</span>(i = 1 + offset / (8 * 8); i &lt; (offset + len) / (8 * 8); ++i) {
<a name="l00613"></a>00613 uip_reassbitmap[i] = 0xff;
<a name="l00614"></a>00614 }
<a name="l00615"></a>00615 uip_reassbitmap[(offset + len) / (8 * 8)] |=
<a name="l00616"></a>00616 ~bitmap_bits[((offset + len) / 8 ) &amp; 7];
<a name="l00617"></a>00617 }
<a name="l00618"></a>00618
<a name="l00619"></a>00619 <span class="comment">/* If this fragment has the More Fragments flag set to zero, we</span>
<a name="l00620"></a>00620 <span class="comment"> know that this is the last fragment, so we can calculate the</span>
<a name="l00621"></a>00621 <span class="comment"> size of the entire packet. We also set the</span>
<a name="l00622"></a>00622 <span class="comment"> IP_REASS_FLAG_LASTFRAG flag to indicate that we have received</span>
<a name="l00623"></a>00623 <span class="comment"> the final fragment. */</span>
<a name="l00624"></a>00624
<a name="l00625"></a>00625 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipoffset[0] &amp; IP_MF) == 0) {
<a name="l00626"></a>00626 uip_reassflags |= UIP_REASS_FLAG_LASTFRAG;
<a name="l00627"></a>00627 uip_reasslen = offset + len;
<a name="l00628"></a>00628 }
<a name="l00629"></a>00629
<a name="l00630"></a>00630 <span class="comment">/* Finally, we check if we have a full packet in the buffer. We do</span>
<a name="l00631"></a>00631 <span class="comment"> this by checking if we have the last fragment and if all bits</span>
<a name="l00632"></a>00632 <span class="comment"> in the bitmap are set. */</span>
<a name="l00633"></a>00633 <span class="keywordflow">if</span>(uip_reassflags &amp; UIP_REASS_FLAG_LASTFRAG) {
<a name="l00634"></a>00634 <span class="comment">/* Check all bytes up to and including all but the last byte in</span>
<a name="l00635"></a>00635 <span class="comment"> the bitmap. */</span>
<a name="l00636"></a>00636 <span class="keywordflow">for</span>(i = 0; i &lt; uip_reasslen / (8 * 8) - 1; ++i) {
<a name="l00637"></a>00637 <span class="keywordflow">if</span>(uip_reassbitmap[i] != 0xff) {
<a name="l00638"></a>00638 <span class="keywordflow">goto</span> nullreturn;
<a name="l00639"></a>00639 }
<a name="l00640"></a>00640 }
<a name="l00641"></a>00641 <span class="comment">/* Check the last byte in the bitmap. It should contain just the</span>
<a name="l00642"></a>00642 <span class="comment"> right amount of bits. */</span>
<a name="l00643"></a>00643 <span class="keywordflow">if</span>(uip_reassbitmap[uip_reasslen / (8 * 8)] !=
<a name="l00644"></a>00644 (<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>)~bitmap_bits[uip_reasslen / 8 &amp; 7]) {
<a name="l00645"></a>00645 <span class="keywordflow">goto</span> nullreturn;
<a name="l00646"></a>00646 }
<a name="l00647"></a>00647
<a name="l00648"></a>00648 <span class="comment">/* If we have come this far, we have a full packet in the</span>
<a name="l00649"></a>00649 <span class="comment"> buffer, so we allocate a pbuf and copy the packet into it. We</span>
<a name="l00650"></a>00650 <span class="comment"> also reset the timer. */</span>
<a name="l00651"></a>00651 uip_reasstmr = 0;
<a name="l00652"></a>00652 memcpy(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>, <a class="code" href="a00150.html#g96544dedc1cdc71ad2ad54bf1d5e5433">FBUF</a>, uip_reasslen);
<a name="l00653"></a>00653
<a name="l00654"></a>00654 <span class="comment">/* Pretend to be a "normal" (i.e., not fragmented) IP packet</span>
<a name="l00655"></a>00655 <span class="comment"> from now on. */</span>
<a name="l00656"></a>00656 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipoffset[0] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipoffset[1] = 0;
<a name="l00657"></a>00657 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] = uip_reasslen &gt;&gt; 8;
<a name="l00658"></a>00658 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] = uip_reasslen &amp; 0xff;
<a name="l00659"></a>00659 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipchksum = 0;
<a name="l00660"></a>00660 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipchksum = ~(<a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>());
<a name="l00661"></a>00661
<a name="l00662"></a>00662 <span class="keywordflow">return</span> uip_reasslen;
<a name="l00663"></a>00663 }
<a name="l00664"></a>00664 }
<a name="l00665"></a>00665
<a name="l00666"></a>00666 nullreturn:
<a name="l00667"></a>00667 <span class="keywordflow">return</span> 0;
<a name="l00668"></a>00668 }
<a name="l00669"></a>00669 <span class="preprocessor">#endif </span><span class="comment">/* UIP_REASSEMBLY */</span>
<a name="l00670"></a>00670 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00671"></a>00671 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00672"></a>00672 uip_add_rcv_nxt(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> n)
<a name="l00673"></a>00673 {
<a name="l00674"></a>00674 <a class="code" href="a00150.html#g6832e4d2d046536b6472f7ac92340f68">uip_add32</a>(<a class="code" href="a00088.html">uip_conn</a>-&gt;rcv_nxt, n);
<a name="l00675"></a>00675 <a class="code" href="a00088.html">uip_conn</a>-&gt;rcv_nxt[0] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[0];
<a name="l00676"></a>00676 <a class="code" href="a00088.html">uip_conn</a>-&gt;rcv_nxt[1] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[1];
<a name="l00677"></a>00677 <a class="code" href="a00088.html">uip_conn</a>-&gt;rcv_nxt[2] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[2];
<a name="l00678"></a>00678 <a class="code" href="a00088.html">uip_conn</a>-&gt;rcv_nxt[3] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[3];
<a name="l00679"></a>00679 }
<a name="l00680"></a>00680 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l00681"></a>00681 <span class="keywordtype">void</span>
<a name="l00682"></a><a class="code" href="a00150.html#g266263ac78a1361a2b1d15741d3b0675">00682</a> <a class="code" href="a00150.html#g266263ac78a1361a2b1d15741d3b0675">uip_process</a>(<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> flag)
<a name="l00683"></a>00683 {
<a name="l00684"></a>00684 <span class="keyword">register</span> <span class="keyword">struct </span><a class="code" href="a00088.html">uip_conn</a> *uip_connr = <a class="code" href="a00088.html">uip_conn</a>;
<a name="l00685"></a>00685
<a name="l00686"></a>00686 <span class="preprocessor">#if UIP_UDP</span>
<a name="l00687"></a>00687 <span class="preprocessor"></span> <span class="keywordflow">if</span>(flag == <a class="code" href="a00150.html#g5c97ae587595b5444be80f5ecc1d3382">UIP_UDP_SEND_CONN</a>) {
<a name="l00688"></a>00688 <span class="keywordflow">goto</span> udp_send;
<a name="l00689"></a>00689 }
<a name="l00690"></a>00690 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
<a name="l00691"></a>00691
<a name="l00692"></a>00692 <a class="code" href="a00150.html#ga05a3dde2048480fa3ab2a5961898d18">uip_sappdata</a> = <a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> = &amp;<a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#g15f2617f7dc1713f9d10282125c6027b">UIP_IPTCPH_LEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a>];
<a name="l00693"></a>00693
<a name="l00694"></a>00694 <span class="comment">/* Check if we were invoked because of a poll request for a</span>
<a name="l00695"></a>00695 <span class="comment"> particular connection. */</span>
<a name="l00696"></a>00696 <span class="keywordflow">if</span>(flag == <a class="code" href="a00150.html#gd605357e29affb0d3104294c90f09905">UIP_POLL_REQUEST</a>) {
<a name="l00697"></a>00697 <span class="keywordflow">if</span>((uip_connr-&gt;<a class="code" href="a00088.html#a5f58074435cdc180f17de69651beebd">tcpstateflags</a> &amp; <a class="code" href="a00150.html#g13dfcb4a5f920e108253ade527a66cc2">UIP_TS_MASK</a>) == <a class="code" href="a00150.html#gae59b70658f28ee6e998eaaab05e423f">UIP_ESTABLISHED</a> &amp;&amp;
<a name="l00698"></a>00698 !<a class="code" href="a00147.html#gef14e83c046e19ab9fe9d1bbcca276c2">uip_outstanding</a>(uip_connr)) {
<a name="l00699"></a>00699 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#gf0ed78fd2be24d849cdd5af75e3b2674">UIP_POLL</a>;
<a name="l00700"></a>00700 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l00701"></a>00701 <span class="keywordflow">goto</span> appsend;
<a name="l00702"></a>00702 }
<a name="l00703"></a>00703 <span class="keywordflow">goto</span> drop;
<a name="l00704"></a>00704
<a name="l00705"></a>00705 <span class="comment">/* Check if we were invoked because of the perodic timer fireing. */</span>
<a name="l00706"></a>00706 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(flag == <a class="code" href="a00150.html#g041aea91aa6ef84dcc6cac3c51db9b2f">UIP_TIMER</a>) {
<a name="l00707"></a>00707 <span class="preprocessor">#if UIP_REASSEMBLY</span>
<a name="l00708"></a>00708 <span class="preprocessor"></span> <span class="keywordflow">if</span>(uip_reasstmr != 0) {
<a name="l00709"></a>00709 --uip_reasstmr;
<a name="l00710"></a>00710 }
<a name="l00711"></a>00711 <span class="preprocessor">#endif </span><span class="comment">/* UIP_REASSEMBLY */</span>
<a name="l00712"></a>00712 <span class="comment">/* Increase the initial sequence number. */</span>
<a name="l00713"></a>00713 <span class="keywordflow">if</span>(++iss[3] == 0) {
<a name="l00714"></a>00714 <span class="keywordflow">if</span>(++iss[2] == 0) {
<a name="l00715"></a>00715 <span class="keywordflow">if</span>(++iss[1] == 0) {
<a name="l00716"></a>00716 ++iss[0];
<a name="l00717"></a>00717 }
<a name="l00718"></a>00718 }
<a name="l00719"></a>00719 }
<a name="l00720"></a>00720
<a name="l00721"></a>00721 <span class="comment">/* Reset the length variables. */</span>
<a name="l00722"></a>00722 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = 0;
<a name="l00723"></a>00723 <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = 0;
<a name="l00724"></a>00724
<a name="l00725"></a>00725 <span class="comment">/* Check if the connection is in a state in which we simply wait</span>
<a name="l00726"></a>00726 <span class="comment"> for the connection to time out. If so, we increase the</span>
<a name="l00727"></a>00727 <span class="comment"> connection's timer and remove the connection if it times</span>
<a name="l00728"></a>00728 <span class="comment"> out. */</span>
<a name="l00729"></a>00729 <span class="keywordflow">if</span>(uip_connr-&gt;<a class="code" href="a00088.html#a5f58074435cdc180f17de69651beebd">tcpstateflags</a> == <a class="code" href="a00150.html#gfff0ed43201bf1e2020de1a0d6cac070">UIP_TIME_WAIT</a> ||
<a name="l00730"></a>00730 uip_connr-&gt;<a class="code" href="a00088.html#a5f58074435cdc180f17de69651beebd">tcpstateflags</a> == <a class="code" href="a00150.html#g160128ab5d2ea3cc497b91ee4eb4ef99">UIP_FIN_WAIT_2</a>) {
<a name="l00731"></a>00731 ++(uip_connr-&gt;<a class="code" href="a00088.html#2d9732cf5752d30bd11cb25dc7d0c8d3">timer</a>);
<a name="l00732"></a>00732 <span class="keywordflow">if</span>(uip_connr-&gt;<a class="code" href="a00088.html#2d9732cf5752d30bd11cb25dc7d0c8d3">timer</a> == <a class="code" href="a00153.html#g2bc3b489923793759526a3181eb667fa">UIP_TIME_WAIT_TIMEOUT</a>) {
<a name="l00733"></a>00733 uip_connr-&gt;<a class="code" href="a00088.html#a5f58074435cdc180f17de69651beebd">tcpstateflags</a> = <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>;
<a name="l00734"></a>00734 }
<a name="l00735"></a>00735 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(uip_connr-&gt;<a class="code" href="a00088.html#a5f58074435cdc180f17de69651beebd">tcpstateflags</a> != <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>) {
<a name="l00736"></a>00736 <span class="comment">/* If the connection has outstanding data, we increase the</span>
<a name="l00737"></a>00737 <span class="comment"> connection's timer and see if it has reached the RTO value</span>
<a name="l00738"></a>00738 <span class="comment"> in which case we retransmit. */</span>
<a name="l00739"></a>00739 <span class="keywordflow">if</span>(<a class="code" href="a00147.html#gef14e83c046e19ab9fe9d1bbcca276c2">uip_outstanding</a>(uip_connr)) {
<a name="l00740"></a>00740 <span class="keywordflow">if</span>(uip_connr-&gt;timer-- == 0) {
<a name="l00741"></a>00741 <span class="keywordflow">if</span>(uip_connr-&gt;nrtx == <a class="code" href="a00153.html#g67cf1e0d2324c93f332c1f020c0fe8b3">UIP_MAXRTX</a> ||
<a name="l00742"></a>00742 ((uip_connr-&gt;tcpstateflags == <a class="code" href="a00150.html#g8af482dec973db57d8b3bd3f69461488">UIP_SYN_SENT</a> ||
<a name="l00743"></a>00743 uip_connr-&gt;tcpstateflags == <a class="code" href="a00150.html#ga5e3c856b86725125d19fccc34cd9eb5">UIP_SYN_RCVD</a>) &amp;&amp;
<a name="l00744"></a>00744 uip_connr-&gt;nrtx == <a class="code" href="a00153.html#g24aa5bc36939cc9a0833e1df01478a7e">UIP_MAXSYNRTX</a>)) {
<a name="l00745"></a>00745 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>;
<a name="l00746"></a>00746
<a name="l00747"></a>00747 <span class="comment">/* We call UIP_APPCALL() with uip_flags set to</span>
<a name="l00748"></a>00748 <span class="comment"> UIP_TIMEDOUT to inform the application that the</span>
<a name="l00749"></a>00749 <span class="comment"> connection has timed out. */</span>
<a name="l00750"></a>00750 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#g2d3ba4b14d6d2f6576f9b547800b7945">UIP_TIMEDOUT</a>;
<a name="l00751"></a>00751 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l00752"></a>00752
<a name="l00753"></a>00753 <span class="comment">/* We also send a reset packet to the remote host. */</span>
<a name="l00754"></a>00754 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = <a class="code" href="a00150.html#g5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a> | <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>;
<a name="l00755"></a>00755 <span class="keywordflow">goto</span> tcp_send_nodata;
<a name="l00756"></a>00756 }
<a name="l00757"></a>00757
<a name="l00758"></a>00758 <span class="comment">/* Exponential backoff. */</span>
<a name="l00759"></a>00759 uip_connr-&gt;timer = <a class="code" href="a00153.html#g15de27b044603284f68db05a378235a7">UIP_RTO</a> &lt;&lt; (uip_connr-&gt;nrtx &gt; 4?
<a name="l00760"></a>00760 4:
<a name="l00761"></a>00761 uip_connr-&gt;nrtx);
<a name="l00762"></a>00762 ++(uip_connr-&gt;nrtx);
<a name="l00763"></a>00763
<a name="l00764"></a>00764 <span class="comment">/* Ok, so we need to retransmit. We do this differently</span>
<a name="l00765"></a>00765 <span class="comment"> depending on which state we are in. In ESTABLISHED, we</span>
<a name="l00766"></a>00766 <span class="comment"> call upon the application so that it may prepare the</span>
<a name="l00767"></a>00767 <span class="comment"> data for the retransmit. In SYN_RCVD, we resend the</span>
<a name="l00768"></a>00768 <span class="comment"> SYNACK that we sent earlier and in LAST_ACK we have to</span>
<a name="l00769"></a>00769 <span class="comment"> retransmit our FINACK. */</span>
<a name="l00770"></a>00770 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#e292b8977f6b81265bf14e1676face3e">tcp</a>.<a class="code" href="a00093.html#3ad48284f7a91f78bb24096aad89056e">rexmit</a>);
<a name="l00771"></a>00771 <span class="keywordflow">switch</span>(uip_connr-&gt;tcpstateflags &amp; <a class="code" href="a00150.html#g13dfcb4a5f920e108253ade527a66cc2">UIP_TS_MASK</a>) {
<a name="l00772"></a>00772 <span class="keywordflow">case</span> <a class="code" href="a00150.html#ga5e3c856b86725125d19fccc34cd9eb5">UIP_SYN_RCVD</a>:
<a name="l00773"></a>00773 <span class="comment">/* In the SYN_RCVD state, we should retransmit our</span>
<a name="l00774"></a>00774 <span class="comment"> SYNACK. */</span>
<a name="l00775"></a>00775 <span class="keywordflow">goto</span> tcp_send_synack;
<a name="l00776"></a>00776
<a name="l00777"></a>00777 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
<a name="l00778"></a>00778 <span class="preprocessor"></span> <span class="keywordflow">case</span> <a class="code" href="a00150.html#g8af482dec973db57d8b3bd3f69461488">UIP_SYN_SENT</a>:
<a name="l00779"></a>00779 <span class="comment">/* In the SYN_SENT state, we retransmit out SYN. */</span>
<a name="l00780"></a>00780 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = 0;
<a name="l00781"></a>00781 <span class="keywordflow">goto</span> tcp_send_syn;
<a name="l00782"></a>00782 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
<a name="l00783"></a>00783
<a name="l00784"></a>00784 <span class="keywordflow">case</span> <a class="code" href="a00150.html#gae59b70658f28ee6e998eaaab05e423f">UIP_ESTABLISHED</a>:
<a name="l00785"></a>00785 <span class="comment">/* In the ESTABLISHED state, we call upon the application</span>
<a name="l00786"></a>00786 <span class="comment"> to do the actual retransmit after which we jump into</span>
<a name="l00787"></a>00787 <span class="comment"> the code for sending out the packet (the apprexmit</span>
<a name="l00788"></a>00788 <span class="comment"> label). */</span>
<a name="l00789"></a>00789 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#gf848ce44c810492e7a35c2d23a429f45">UIP_REXMIT</a>;
<a name="l00790"></a>00790 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l00791"></a>00791 <span class="keywordflow">goto</span> apprexmit;
<a name="l00792"></a>00792
<a name="l00793"></a>00793 <span class="keywordflow">case</span> <a class="code" href="a00150.html#ga533c394b1fa0030205534befa31c525">UIP_FIN_WAIT_1</a>:
<a name="l00794"></a>00794 <span class="keywordflow">case</span> <a class="code" href="a00150.html#g64d9affc680a445d708234e70450477b">UIP_CLOSING</a>:
<a name="l00795"></a>00795 <span class="keywordflow">case</span> <a class="code" href="a00150.html#gd135fb0cfdfb2c212f0f51865a3640e4">UIP_LAST_ACK</a>:
<a name="l00796"></a>00796 <span class="comment">/* In all these states we should retransmit a FINACK. */</span>
<a name="l00797"></a>00797 <span class="keywordflow">goto</span> tcp_send_finack;
<a name="l00798"></a>00798
<a name="l00799"></a>00799 }
<a name="l00800"></a>00800 }
<a name="l00801"></a>00801 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>((uip_connr-&gt;tcpstateflags &amp; <a class="code" href="a00150.html#g13dfcb4a5f920e108253ade527a66cc2">UIP_TS_MASK</a>) == <a class="code" href="a00150.html#gae59b70658f28ee6e998eaaab05e423f">UIP_ESTABLISHED</a>) {
<a name="l00802"></a>00802 <span class="comment">/* If there was no need for a retransmission, we poll the</span>
<a name="l00803"></a>00803 <span class="comment"> application for new data. */</span>
<a name="l00804"></a>00804 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#gf0ed78fd2be24d849cdd5af75e3b2674">UIP_POLL</a>;
<a name="l00805"></a>00805 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l00806"></a>00806 <span class="keywordflow">goto</span> appsend;
<a name="l00807"></a>00807 }
<a name="l00808"></a>00808 }
<a name="l00809"></a>00809 <span class="keywordflow">goto</span> drop;
<a name="l00810"></a>00810 }
<a name="l00811"></a>00811 <span class="preprocessor">#if UIP_UDP</span>
<a name="l00812"></a>00812 <span class="preprocessor"></span> <span class="keywordflow">if</span>(flag == <a class="code" href="a00150.html#gf0ccbc3bb2a3ba1ebc255c7b3fcedd24">UIP_UDP_TIMER</a>) {
<a name="l00813"></a>00813 <span class="keywordflow">if</span>(<a class="code" href="a00095.html">uip_udp_conn</a>-&gt;lport != 0) {
<a name="l00814"></a>00814 <a class="code" href="a00088.html">uip_conn</a> = <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l00815"></a>00815 <a class="code" href="a00150.html#ga05a3dde2048480fa3ab2a5961898d18">uip_sappdata</a> = <a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> = &amp;<a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + <a class="code" href="a00150.html#g6f2b90c597ec23f39ec716ccec11233c">UIP_IPUDPH_LEN</a>];
<a name="l00816"></a>00816 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = 0;
<a name="l00817"></a>00817 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#gf0ed78fd2be24d849cdd5af75e3b2674">UIP_POLL</a>;
<a name="l00818"></a>00818 <a class="code" href="a00160.html#g3d768e989e308144190ae1a5ddfa9726">UIP_UDP_APPCALL</a>();
<a name="l00819"></a>00819 <span class="keywordflow">goto</span> udp_send;
<a name="l00820"></a>00820 } <span class="keywordflow">else</span> {
<a name="l00821"></a>00821 <span class="keywordflow">goto</span> drop;
<a name="l00822"></a>00822 }
<a name="l00823"></a>00823 }
<a name="l00824"></a>00824 <span class="preprocessor">#endif</span>
<a name="l00825"></a>00825 <span class="preprocessor"></span>
<a name="l00826"></a>00826 <span class="comment">/* This is where the input processing starts. */</span>
<a name="l00827"></a>00827 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#7f7bb2145afba5df00c6e10ddefa8ae1">recv</a>);
<a name="l00828"></a>00828
<a name="l00829"></a>00829 <span class="comment">/* Start of IP input header processing code. */</span>
<a name="l00830"></a>00830
<a name="l00831"></a>00831 <span class="preprocessor">#if UIP_CONF_IPV6</span>
<a name="l00832"></a>00832 <span class="preprocessor"></span> <span class="comment">/* Check validity of the IP header. */</span>
<a name="l00833"></a>00833 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;vtc &amp; 0xf0) != 0x60) { <span class="comment">/* IP version and header length. */</span>
<a name="l00834"></a>00834 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l00835"></a>00835 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#b93e351c3abba0c700b26b7b07e9527d">vhlerr</a>);
<a name="l00836"></a>00836 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"ipv6: invalid version."</span>);
<a name="l00837"></a>00837 <span class="keywordflow">goto</span> drop;
<a name="l00838"></a>00838 }
<a name="l00839"></a>00839 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00840"></a>00840 <span class="comment">/* Check validity of the IP header. */</span>
<a name="l00841"></a>00841 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;vhl != 0x45) { <span class="comment">/* IP version and header length. */</span>
<a name="l00842"></a>00842 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l00843"></a>00843 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#b93e351c3abba0c700b26b7b07e9527d">vhlerr</a>);
<a name="l00844"></a>00844 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"ip: invalid version or header length."</span>);
<a name="l00845"></a>00845 <span class="keywordflow">goto</span> drop;
<a name="l00846"></a>00846 }
<a name="l00847"></a>00847 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00848"></a>00848
<a name="l00849"></a>00849 <span class="comment">/* Check the size of the packet. If the size reported to us in</span>
<a name="l00850"></a>00850 <span class="comment"> uip_len is smaller the size reported in the IP header, we assume</span>
<a name="l00851"></a>00851 <span class="comment"> that the packet has been corrupted in transit. If the size of</span>
<a name="l00852"></a>00852 <span class="comment"> uip_len is larger than the size reported in the IP packet header,</span>
<a name="l00853"></a>00853 <span class="comment"> the packet has been padded and we set uip_len to the correct</span>
<a name="l00854"></a>00854 <span class="comment"> value.. */</span>
<a name="l00855"></a>00855
<a name="l00856"></a>00856 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] &lt;&lt; 8) + <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] &lt;= <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>) {
<a name="l00857"></a>00857 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = (<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] &lt;&lt; 8) + <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1];
<a name="l00858"></a>00858 #<span class="keywordflow">if</span> UIP_CONF_IPV6
<a name="l00859"></a>00859 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> += 40; <span class="comment">/* The length reported in the IPv6 header is the</span>
<a name="l00860"></a>00860 <span class="comment"> length of the payload that follows the</span>
<a name="l00861"></a>00861 <span class="comment"> header. However, uIP uses the uip_len variable</span>
<a name="l00862"></a>00862 <span class="comment"> for holding the size of the entire packet,</span>
<a name="l00863"></a>00863 <span class="comment"> including the IP header. For IPv4 this is not a</span>
<a name="l00864"></a>00864 <span class="comment"> problem as the length field in the IPv4 header</span>
<a name="l00865"></a>00865 <span class="comment"> contains the length of the entire packet. But</span>
<a name="l00866"></a>00866 <span class="comment"> for IPv6 we need to add the size of the IPv6</span>
<a name="l00867"></a>00867 <span class="comment"> header (40 bytes). */</span>
<a name="l00868"></a>00868 #endif <span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00869"></a>00869 } <span class="keywordflow">else</span> {
<a name="l00870"></a>00870 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"ip: packet shorter than reported in IP header."</span>);
<a name="l00871"></a>00871 <span class="keywordflow">goto</span> drop;
<a name="l00872"></a>00872 }
<a name="l00873"></a>00873
<a name="l00874"></a>00874 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
<a name="l00875"></a>00875 <span class="preprocessor"></span> <span class="comment">/* Check the fragment flag. */</span>
<a name="l00876"></a>00876 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipoffset[0] &amp; 0x3f) != 0 ||
<a name="l00877"></a>00877 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipoffset[1] != 0) {
<a name="l00878"></a>00878 <span class="preprocessor">#if UIP_REASSEMBLY</span>
<a name="l00879"></a>00879 <span class="preprocessor"></span> <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = uip_reass();
<a name="l00880"></a>00880 <span class="keywordflow">if</span>(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> == 0) {
<a name="l00881"></a>00881 <span class="keywordflow">goto</span> drop;
<a name="l00882"></a>00882 }
<a name="l00883"></a>00883 <span class="preprocessor">#else </span><span class="comment">/* UIP_REASSEMBLY */</span>
<a name="l00884"></a>00884 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l00885"></a>00885 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#8082509468b2ac80ed7746aa1a5bc4f7">fragerr</a>);
<a name="l00886"></a>00886 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"ip: fragment dropped."</span>);
<a name="l00887"></a>00887 <span class="keywordflow">goto</span> drop;
<a name="l00888"></a>00888 <span class="preprocessor">#endif </span><span class="comment">/* UIP_REASSEMBLY */</span>
<a name="l00889"></a>00889 }
<a name="l00890"></a>00890 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00891"></a>00891
<a name="l00892"></a>00892 <span class="keywordflow">if</span>(<a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(<a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>, all_zeroes_addr)) {
<a name="l00893"></a>00893 <span class="comment">/* If we are configured to use ping IP address configuration and</span>
<a name="l00894"></a>00894 <span class="comment"> hasn't been assigned an IP address yet, we accept all ICMP</span>
<a name="l00895"></a>00895 <span class="comment"> packets. */</span>
<a name="l00896"></a>00896 <span class="preprocessor">#if UIP_PINGADDRCONF &amp;&amp; !UIP_CONF_IPV6</span>
<a name="l00897"></a>00897 <span class="preprocessor"></span> <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;proto == <a class="code" href="a00150.html#g359951eecd80541c2101f628a9da9146">UIP_PROTO_ICMP</a>) {
<a name="l00898"></a>00898 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"ip: possible ping config packet received."</span>);
<a name="l00899"></a>00899 <span class="keywordflow">goto</span> icmp_input;
<a name="l00900"></a>00900 } <span class="keywordflow">else</span> {
<a name="l00901"></a>00901 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"ip: packet dropped since no address assigned."</span>);
<a name="l00902"></a>00902 <span class="keywordflow">goto</span> drop;
<a name="l00903"></a>00903 }
<a name="l00904"></a>00904 <span class="preprocessor">#endif </span><span class="comment">/* UIP_PINGADDRCONF */</span>
<a name="l00905"></a>00905
<a name="l00906"></a>00906 } <span class="keywordflow">else</span> {
<a name="l00907"></a>00907 <span class="comment">/* If IP broadcast support is configured, we check for a broadcast</span>
<a name="l00908"></a>00908 <span class="comment"> UDP packet, which may be destined to us. */</span>
<a name="l00909"></a>00909 <span class="preprocessor">#if UIP_BROADCAST</span>
<a name="l00910"></a>00910 <span class="preprocessor"></span> <a class="code" href="a00135.html#534d9e416324fb8ecca6b9cb4b1f6a6a">DEBUG_PRINTF</a>(<span class="stringliteral">"UDP IP checksum 0x%04x\n"</span>, <a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>());
<a name="l00911"></a>00911 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;proto == <a class="code" href="a00150.html#gf72d7b9a737707dcfb2c41fec2b6792e">UIP_PROTO_UDP</a> &amp;&amp;
<a name="l00912"></a>00912 <a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr, all_ones_addr)
<a name="l00913"></a>00913 <span class="comment">/*&amp;&amp;</span>
<a name="l00914"></a>00914 <span class="comment"> uip_ipchksum() == 0xffff*/</span>) {
<a name="l00915"></a>00915 <span class="keywordflow">goto</span> udp_input;
<a name="l00916"></a>00916 }
<a name="l00917"></a>00917 <span class="preprocessor">#endif </span><span class="comment">/* UIP_BROADCAST */</span>
<a name="l00918"></a>00918
<a name="l00919"></a>00919 <span class="comment">/* Check if the packet is destined for our IP address. */</span>
<a name="l00920"></a>00920 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
<a name="l00921"></a>00921 <span class="preprocessor"></span> <span class="keywordflow">if</span>(!<a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr, <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>)) {
<a name="l00922"></a>00922 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l00923"></a>00923 <span class="keywordflow">goto</span> drop;
<a name="l00924"></a>00924 }
<a name="l00925"></a>00925 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00926"></a>00926 <span class="comment">/* For IPv6, packet reception is a little trickier as we need to</span>
<a name="l00927"></a>00927 <span class="comment"> make sure that we listen to certain multicast addresses (all</span>
<a name="l00928"></a>00928 <span class="comment"> hosts multicast address, and the solicited-node multicast</span>
<a name="l00929"></a>00929 <span class="comment"> address) as well. However, we will cheat here and accept all</span>
<a name="l00930"></a>00930 <span class="comment"> multicast packets that are sent to the ff02::/16 addresses. */</span>
<a name="l00931"></a>00931 <span class="keywordflow">if</span>(!<a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr, <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>) &amp;&amp;
<a name="l00932"></a>00932 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr[0] != <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(0xff02)) {
<a name="l00933"></a>00933 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l00934"></a>00934 <span class="keywordflow">goto</span> drop;
<a name="l00935"></a>00935 }
<a name="l00936"></a>00936 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00937"></a>00937 }
<a name="l00938"></a>00938
<a name="l00939"></a>00939 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
<a name="l00940"></a>00940 <span class="preprocessor"></span> <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>() != 0xffff) { <span class="comment">/* Compute and check the IP header</span>
<a name="l00941"></a>00941 <span class="comment"> checksum. */</span>
<a name="l00942"></a>00942 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l00943"></a>00943 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#7675e6b9adbddbd545d3aac8ca092fbb">chkerr</a>);
<a name="l00944"></a>00944 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"ip: bad checksum."</span>);
<a name="l00945"></a>00945 <span class="keywordflow">goto</span> drop;
<a name="l00946"></a>00946 }
<a name="l00947"></a>00947 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l00948"></a>00948
<a name="l00949"></a>00949 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;proto == <a class="code" href="a00150.html#g517c770991459cc62dc009c0d3875c6a">UIP_PROTO_TCP</a>) { <span class="comment">/* Check for TCP packet. If so,</span>
<a name="l00950"></a>00950 <span class="comment"> proceed with TCP input</span>
<a name="l00951"></a>00951 <span class="comment"> processing. */</span>
<a name="l00952"></a>00952 <span class="keywordflow">goto</span> tcp_input;
<a name="l00953"></a>00953 }
<a name="l00954"></a>00954
<a name="l00955"></a>00955 <span class="preprocessor">#if UIP_UDP</span>
<a name="l00956"></a>00956 <span class="preprocessor"></span> <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;proto == <a class="code" href="a00150.html#gf72d7b9a737707dcfb2c41fec2b6792e">UIP_PROTO_UDP</a>) {
<a name="l00957"></a>00957 <span class="keywordflow">goto</span> udp_input;
<a name="l00958"></a>00958 }
<a name="l00959"></a>00959 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
<a name="l00960"></a>00960
<a name="l00961"></a>00961 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
<a name="l00962"></a>00962 <span class="preprocessor"></span> <span class="comment">/* ICMPv4 processing code follows. */</span>
<a name="l00963"></a>00963 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;proto != <a class="code" href="a00150.html#g359951eecd80541c2101f628a9da9146">UIP_PROTO_ICMP</a>) { <span class="comment">/* We only allow ICMP packets from</span>
<a name="l00964"></a>00964 <span class="comment"> here. */</span>
<a name="l00965"></a>00965 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l00966"></a>00966 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#b4622e2599ff3a592db09219b2641682">protoerr</a>);
<a name="l00967"></a>00967 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"ip: neither tcp nor icmp."</span>);
<a name="l00968"></a>00968 <span class="keywordflow">goto</span> drop;
<a name="l00969"></a>00969 }
<a name="l00970"></a>00970
<a name="l00971"></a>00971 <span class="preprocessor">#if UIP_PINGADDRCONF</span>
<a name="l00972"></a>00972 <span class="preprocessor"></span> icmp_input:
<a name="l00973"></a>00973 <span class="preprocessor">#endif </span><span class="comment">/* UIP_PINGADDRCONF */</span>
<a name="l00974"></a>00974 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#3983b45977630418d3038231aa8b68ed">icmp</a>.<a class="code" href="a00093.html#7f7bb2145afba5df00c6e10ddefa8ae1">recv</a>);
<a name="l00975"></a>00975
<a name="l00976"></a>00976 <span class="comment">/* ICMP echo (i.e., ping) processing. This is simple, we only change</span>
<a name="l00977"></a>00977 <span class="comment"> the ICMP type from ECHO to ECHO_REPLY and adjust the ICMP</span>
<a name="l00978"></a>00978 <span class="comment"> checksum before we return the packet. */</span>
<a name="l00979"></a>00979 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;type != <a class="code" href="a00150.html#gd58231410d58e34b455328b888a9e73c">ICMP_ECHO</a>) {
<a name="l00980"></a>00980 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#3983b45977630418d3038231aa8b68ed">icmp</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l00981"></a>00981 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#3983b45977630418d3038231aa8b68ed">icmp</a>.<a class="code" href="a00093.html#8da121d6e50992ec55778f9b2141552d">typeerr</a>);
<a name="l00982"></a>00982 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"icmp: not icmp echo."</span>);
<a name="l00983"></a>00983 <span class="keywordflow">goto</span> drop;
<a name="l00984"></a>00984 }
<a name="l00985"></a>00985
<a name="l00986"></a>00986 <span class="comment">/* If we are configured to use ping IP address assignment, we use</span>
<a name="l00987"></a>00987 <span class="comment"> the destination IP address of this ping packet and assign it to</span>
<a name="l00988"></a>00988 <span class="comment"> ourself. */</span>
<a name="l00989"></a>00989 <span class="preprocessor">#if UIP_PINGADDRCONF</span>
<a name="l00990"></a>00990 <span class="preprocessor"></span> <span class="keywordflow">if</span>((<a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>[0] | <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>[1]) == 0) {
<a name="l00991"></a>00991 <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>[0] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr[0];
<a name="l00992"></a>00992 <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>[1] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr[1];
<a name="l00993"></a>00993 }
<a name="l00994"></a>00994 <span class="preprocessor">#endif </span><span class="comment">/* UIP_PINGADDRCONF */</span>
<a name="l00995"></a>00995
<a name="l00996"></a>00996 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;type = <a class="code" href="a00150.html#g5c5b1834e497f53ad0ef947bbe9777fa">ICMP_ECHO_REPLY</a>;
<a name="l00997"></a>00997
<a name="l00998"></a>00998 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;icmpchksum &gt;= <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(0xffff - (<a class="code" href="a00150.html#gd58231410d58e34b455328b888a9e73c">ICMP_ECHO</a> &lt;&lt; 8))) {
<a name="l00999"></a>00999 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;icmpchksum += <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(<a class="code" href="a00150.html#gd58231410d58e34b455328b888a9e73c">ICMP_ECHO</a> &lt;&lt; 8) + 1;
<a name="l01000"></a>01000 } <span class="keywordflow">else</span> {
<a name="l01001"></a>01001 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;icmpchksum += <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(<a class="code" href="a00150.html#gd58231410d58e34b455328b888a9e73c">ICMP_ECHO</a> &lt;&lt; 8);
<a name="l01002"></a>01002 }
<a name="l01003"></a>01003
<a name="l01004"></a>01004 <span class="comment">/* Swap IP addresses. */</span>
<a name="l01005"></a>01005 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr, <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr);
<a name="l01006"></a>01006 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr, <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>);
<a name="l01007"></a>01007
<a name="l01008"></a>01008 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#3983b45977630418d3038231aa8b68ed">icmp</a>.<a class="code" href="a00093.html#dc69abadd5aa07c7d74f9292db2cd93c">sent</a>);
<a name="l01009"></a>01009 <span class="keywordflow">goto</span> send;
<a name="l01010"></a>01010
<a name="l01011"></a>01011 <span class="comment">/* End of IPv4 input header processing code. */</span>
<a name="l01012"></a>01012 <span class="preprocessor">#else </span><span class="comment">/* !UIP_CONF_IPV6 */</span>
<a name="l01013"></a>01013
<a name="l01014"></a>01014 <span class="comment">/* This is IPv6 ICMPv6 processing code. */</span>
<a name="l01015"></a>01015 <a class="code" href="a00135.html#534d9e416324fb8ecca6b9cb4b1f6a6a">DEBUG_PRINTF</a>(<span class="stringliteral">"icmp6_input: length %d\n"</span>, <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>);
<a name="l01016"></a>01016
<a name="l01017"></a>01017 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;proto != <a class="code" href="a00150.html#gad0321f4c570f9983c6de81ece3ddc20">UIP_PROTO_ICMP6</a>) { <span class="comment">/* We only allow ICMPv6 packets from</span>
<a name="l01018"></a>01018 <span class="comment"> here. */</span>
<a name="l01019"></a>01019 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l01020"></a>01020 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#b4622e2599ff3a592db09219b2641682">protoerr</a>);
<a name="l01021"></a>01021 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"ip: neither tcp nor icmp6."</span>);
<a name="l01022"></a>01022 <span class="keywordflow">goto</span> drop;
<a name="l01023"></a>01023 }
<a name="l01024"></a>01024
<a name="l01025"></a>01025 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#3983b45977630418d3038231aa8b68ed">icmp</a>.<a class="code" href="a00093.html#7f7bb2145afba5df00c6e10ddefa8ae1">recv</a>);
<a name="l01026"></a>01026
<a name="l01027"></a>01027 <span class="comment">/* If we get a neighbor solicitation for our address we should send</span>
<a name="l01028"></a>01028 <span class="comment"> a neighbor advertisement message back. */</span>
<a name="l01029"></a>01029 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;type == <a class="code" href="a00150.html#g1cea57e3ea526f210b1068e6dcf7b4f4">ICMP6_NEIGHBOR_SOLICITATION</a>) {
<a name="l01030"></a>01030 <span class="keywordflow">if</span>(<a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;icmp6data, <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>)) {
<a name="l01031"></a>01031
<a name="l01032"></a>01032 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;options[0] == <a class="code" href="a00150.html#g42288d5c3cf4b10becefec657f441e54">ICMP6_OPTION_SOURCE_LINK_ADDRESS</a>) {
<a name="l01033"></a>01033 <span class="comment">/* Save the sender's address in our neighbor list. */</span>
<a name="l01034"></a>01034 <a class="code" href="a00132.html#88460bea09a462d0e22511cb567eee14">uip_neighbor_add</a>(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;srcipaddr, &amp;(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;options[2]));
<a name="l01035"></a>01035 }
<a name="l01036"></a>01036
<a name="l01037"></a>01037 <span class="comment">/* We should now send a neighbor advertisement back to where the</span>
<a name="l01038"></a>01038 <span class="comment"> neighbor solicication came from. */</span>
<a name="l01039"></a>01039 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;type = <a class="code" href="a00150.html#g62c03e0a308cc23929a80fe8d8f9dc1e">ICMP6_NEIGHBOR_ADVERTISEMENT</a>;
<a name="l01040"></a>01040 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;flags = <a class="code" href="a00150.html#g1d3211dbbdfb22d6a47b60dddcf945e8">ICMP6_FLAG_S</a>; <span class="comment">/* Solicited flag. */</span>
<a name="l01041"></a>01041
<a name="l01042"></a>01042 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;reserved1 = <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;reserved2 = <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;reserved3 = 0;
<a name="l01043"></a>01043
<a name="l01044"></a>01044 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;destipaddr, <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;srcipaddr);
<a name="l01045"></a>01045 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;srcipaddr, <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>);
<a name="l01046"></a>01046 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;options[0] = <a class="code" href="a00150.html#g8387881de3a8bfd3c0d57b9d04ac9b7e">ICMP6_OPTION_TARGET_LINK_ADDRESS</a>;
<a name="l01047"></a>01047 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;options[1] = 1; <span class="comment">/* Options length, 1 = 8 bytes. */</span>
<a name="l01048"></a>01048 memcpy(&amp;(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;options[2]), &amp;<a class="code" href="a00150.html#g499bb98a0b4ae9a98553ede81317606d">uip_ethaddr</a>, <span class="keyword">sizeof</span>(<a class="code" href="a00150.html#g499bb98a0b4ae9a98553ede81317606d">uip_ethaddr</a>));
<a name="l01049"></a>01049 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;icmpchksum = 0;
<a name="l01050"></a>01050 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;icmpchksum = ~uip_icmp6chksum();
<a name="l01051"></a>01051 <span class="keywordflow">goto</span> send;
<a name="l01052"></a>01052
<a name="l01053"></a>01053 }
<a name="l01054"></a>01054 <span class="keywordflow">goto</span> drop;
<a name="l01055"></a>01055 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;type == <a class="code" href="a00150.html#g4cc3e223b63f27b546d62e9a258dba5a">ICMP6_ECHO</a>) {
<a name="l01056"></a>01056 <span class="comment">/* ICMP echo (i.e., ping) processing. This is simple, we only</span>
<a name="l01057"></a>01057 <span class="comment"> change the ICMP type from ECHO to ECHO_REPLY and update the</span>
<a name="l01058"></a>01058 <span class="comment"> ICMP checksum before we return the packet. */</span>
<a name="l01059"></a>01059
<a name="l01060"></a>01060 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;type = <a class="code" href="a00150.html#g207d17b633cd095120a74bc1f2257b17">ICMP6_ECHO_REPLY</a>;
<a name="l01061"></a>01061
<a name="l01062"></a>01062 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr, <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr);
<a name="l01063"></a>01063 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr, <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>);
<a name="l01064"></a>01064 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;icmpchksum = 0;
<a name="l01065"></a>01065 <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;icmpchksum = ~uip_icmp6chksum();
<a name="l01066"></a>01066
<a name="l01067"></a>01067 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#3983b45977630418d3038231aa8b68ed">icmp</a>.<a class="code" href="a00093.html#dc69abadd5aa07c7d74f9292db2cd93c">sent</a>);
<a name="l01068"></a>01068 <span class="keywordflow">goto</span> send;
<a name="l01069"></a>01069 } <span class="keywordflow">else</span> {
<a name="l01070"></a>01070 <a class="code" href="a00135.html#534d9e416324fb8ecca6b9cb4b1f6a6a">DEBUG_PRINTF</a>(<span class="stringliteral">"Unknown icmp6 message type %d\n"</span>, <a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">ICMPBUF</a>-&gt;type);
<a name="l01071"></a>01071 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#3983b45977630418d3038231aa8b68ed">icmp</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l01072"></a>01072 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#3983b45977630418d3038231aa8b68ed">icmp</a>.<a class="code" href="a00093.html#8da121d6e50992ec55778f9b2141552d">typeerr</a>);
<a name="l01073"></a>01073 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"icmp: unknown ICMP message."</span>);
<a name="l01074"></a>01074 <span class="keywordflow">goto</span> drop;
<a name="l01075"></a>01075 }
<a name="l01076"></a>01076
<a name="l01077"></a>01077 <span class="comment">/* End of IPv6 ICMP processing. */</span>
<a name="l01078"></a>01078
<a name="l01079"></a>01079 <span class="preprocessor">#endif </span><span class="comment">/* !UIP_CONF_IPV6 */</span>
<a name="l01080"></a>01080
<a name="l01081"></a>01081 <span class="preprocessor">#if UIP_UDP</span>
<a name="l01082"></a>01082 <span class="preprocessor"></span> <span class="comment">/* UDP input processing. */</span>
<a name="l01083"></a>01083 udp_input:
<a name="l01084"></a>01084 <span class="comment">/* UDP processing is really just a hack. We don't do anything to the</span>
<a name="l01085"></a>01085 <span class="comment"> UDP/IP headers, but let the UDP application do all the hard</span>
<a name="l01086"></a>01086 <span class="comment"> work. If the application sets uip_slen, it has a packet to</span>
<a name="l01087"></a>01087 <span class="comment"> send. */</span>
<a name="l01088"></a>01088 <span class="preprocessor">#if UIP_UDP_CHECKSUMS</span>
<a name="l01089"></a>01089 <span class="preprocessor"></span> <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6f2b90c597ec23f39ec716ccec11233c">UIP_IPUDPH_LEN</a>;
<a name="l01090"></a>01090 <a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> = &amp;<a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + UIP_IPUDPH_LEN];
<a name="l01091"></a>01091 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb9435261753469accec0c9bf8a5a2686">UDPBUF</a>-&gt;udpchksum != 0 &amp;&amp; <a class="code" href="a00150.html#g7023a34ba9e9d03b5fbedbcb32924453">uip_udpchksum</a>() != 0xffff) {
<a name="l01092"></a>01092 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#4f39f0fe6a820d260fe6cddf9ccaa832">udp</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l01093"></a>01093 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#4f39f0fe6a820d260fe6cddf9ccaa832">udp</a>.<a class="code" href="a00093.html#7675e6b9adbddbd545d3aac8ca092fbb">chkerr</a>);
<a name="l01094"></a>01094 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"udp: bad checksum."</span>);
<a name="l01095"></a>01095 <span class="keywordflow">goto</span> drop;
<a name="l01096"></a>01096 }
<a name="l01097"></a>01097 <span class="preprocessor">#else </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
<a name="l01098"></a>01098 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - UIP_IPUDPH_LEN;
<a name="l01099"></a>01099 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
<a name="l01100"></a>01100
<a name="l01101"></a>01101 <span class="comment">/* Demultiplex this UDP packet between the UDP "connections". */</span>
<a name="l01102"></a>01102 <span class="keywordflow">for</span>(<a class="code" href="a00095.html">uip_udp_conn</a> = &amp;<a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">uip_udp_conns</a>[0];
<a name="l01103"></a>01103 <a class="code" href="a00095.html">uip_udp_conn</a> &lt; &amp;<a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">uip_udp_conns</a>[<a class="code" href="a00153.html#g196379ceb1219a99f4495e41ccc9bbfb">UIP_UDP_CONNS</a>];
<a name="l01104"></a>01104 ++<a class="code" href="a00095.html">uip_udp_conn</a>) {
<a name="l01105"></a>01105 <span class="comment">/* If the local UDP port is non-zero, the connection is considered</span>
<a name="l01106"></a>01106 <span class="comment"> to be used. If so, the local port number is checked against the</span>
<a name="l01107"></a>01107 <span class="comment"> destination port number in the received packet. If the two port</span>
<a name="l01108"></a>01108 <span class="comment"> numbers match, the remote port number is checked if the</span>
<a name="l01109"></a>01109 <span class="comment"> connection is bound to a remote port. Finally, if the</span>
<a name="l01110"></a>01110 <span class="comment"> connection is bound to a remote IP address, the source IP</span>
<a name="l01111"></a>01111 <span class="comment"> address of the packet is checked. */</span>
<a name="l01112"></a>01112 <span class="keywordflow">if</span>(<a class="code" href="a00095.html">uip_udp_conn</a>-&gt;lport != 0 &amp;&amp;
<a name="l01113"></a>01113 <a class="code" href="a00150.html#gb9435261753469accec0c9bf8a5a2686">UDPBUF</a>-&gt;destport == <a class="code" href="a00095.html">uip_udp_conn</a>-&gt;lport &amp;&amp;
<a name="l01114"></a>01114 (<a class="code" href="a00095.html">uip_udp_conn</a>-&gt;rport == 0 ||
<a name="l01115"></a>01115 <a class="code" href="a00150.html#gb9435261753469accec0c9bf8a5a2686">UDPBUF</a>-&gt;srcport == <a class="code" href="a00095.html">uip_udp_conn</a>-&gt;rport) &amp;&amp;
<a name="l01116"></a>01116 (<a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(<a class="code" href="a00095.html">uip_udp_conn</a>-&gt;ripaddr, all_zeroes_addr) ||
<a name="l01117"></a>01117 <a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(<a class="code" href="a00095.html">uip_udp_conn</a>-&gt;ripaddr, all_ones_addr) ||
<a name="l01118"></a>01118 <a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr, <a class="code" href="a00095.html">uip_udp_conn</a>-&gt;ripaddr))) {
<a name="l01119"></a>01119 <span class="keywordflow">goto</span> udp_found;
<a name="l01120"></a>01120 }
<a name="l01121"></a>01121 }
<a name="l01122"></a>01122 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"udp: no matching connection found"</span>);
<a name="l01123"></a>01123 <span class="keywordflow">goto</span> drop;
<a name="l01124"></a>01124
<a name="l01125"></a>01125 udp_found:
<a name="l01126"></a>01126 <a class="code" href="a00088.html">uip_conn</a> = <a class="code" href="a00160.html#g070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;
<a name="l01127"></a>01127 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#g39ce739bd352d7e348e37395ce903e43">UIP_NEWDATA</a>;
<a name="l01128"></a>01128 <a class="code" href="a00150.html#ga05a3dde2048480fa3ab2a5961898d18">uip_sappdata</a> = <a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> = &amp;<a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + <a class="code" href="a00150.html#g6f2b90c597ec23f39ec716ccec11233c">UIP_IPUDPH_LEN</a>];
<a name="l01129"></a>01129 <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = 0;
<a name="l01130"></a>01130 <a class="code" href="a00160.html#g3d768e989e308144190ae1a5ddfa9726">UIP_UDP_APPCALL</a>();
<a name="l01131"></a>01131 udp_send:
<a name="l01132"></a>01132 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> == 0) {
<a name="l01133"></a>01133 <span class="keywordflow">goto</span> drop;
<a name="l01134"></a>01134 }
<a name="l01135"></a>01135 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> + <a class="code" href="a00150.html#g6f2b90c597ec23f39ec716ccec11233c">UIP_IPUDPH_LEN</a>;
<a name="l01136"></a>01136
<a name="l01137"></a>01137 <span class="preprocessor">#if UIP_CONF_IPV6</span>
<a name="l01138"></a>01138 <span class="preprocessor"></span> <span class="comment">/* For IPv6, the IP length field does not include the IPv6 IP header</span>
<a name="l01139"></a>01139 <span class="comment"> length. */</span>
<a name="l01140"></a>01140 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>) &gt;&gt; 8);
<a name="l01141"></a>01141 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>) &amp; 0xff);
<a name="l01142"></a>01142 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l01143"></a>01143 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] = (<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt;&gt; 8);
<a name="l01144"></a>01144 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] = (<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &amp; 0xff);
<a name="l01145"></a>01145 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l01146"></a>01146
<a name="l01147"></a>01147 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ttl = <a class="code" href="a00095.html">uip_udp_conn</a>-&gt;ttl;
<a name="l01148"></a>01148 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;proto = <a class="code" href="a00150.html#gf72d7b9a737707dcfb2c41fec2b6792e">UIP_PROTO_UDP</a>;
<a name="l01149"></a>01149
<a name="l01150"></a>01150 <a class="code" href="a00150.html#gb9435261753469accec0c9bf8a5a2686">UDPBUF</a>-&gt;udplen = <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(<a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> + <a class="code" href="a00150.html#gb948296aea6b6b3aa1f156799c4d479c">UIP_UDPH_LEN</a>);
<a name="l01151"></a>01151 <a class="code" href="a00150.html#gb9435261753469accec0c9bf8a5a2686">UDPBUF</a>-&gt;udpchksum = 0;
<a name="l01152"></a>01152
<a name="l01153"></a>01153 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcport = <a class="code" href="a00095.html">uip_udp_conn</a>-&gt;lport;
<a name="l01154"></a>01154 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destport = <a class="code" href="a00095.html">uip_udp_conn</a>-&gt;rport;
<a name="l01155"></a>01155
<a name="l01156"></a>01156 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr, <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>);
<a name="l01157"></a>01157 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr, <a class="code" href="a00095.html">uip_udp_conn</a>-&gt;ripaddr);
<a name="l01158"></a>01158
<a name="l01159"></a>01159 <a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> = &amp;<a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + <a class="code" href="a00150.html#g15f2617f7dc1713f9d10282125c6027b">UIP_IPTCPH_LEN</a>];
<a name="l01160"></a>01160
<a name="l01161"></a>01161 <span class="preprocessor">#if UIP_UDP_CHECKSUMS</span>
<a name="l01162"></a>01162 <span class="preprocessor"></span> <span class="comment">/* Calculate UDP checksum. */</span>
<a name="l01163"></a>01163 <a class="code" href="a00150.html#gb9435261753469accec0c9bf8a5a2686">UDPBUF</a>-&gt;udpchksum = ~(<a class="code" href="a00150.html#g7023a34ba9e9d03b5fbedbcb32924453">uip_udpchksum</a>());
<a name="l01164"></a>01164 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb9435261753469accec0c9bf8a5a2686">UDPBUF</a>-&gt;udpchksum == 0) {
<a name="l01165"></a>01165 <a class="code" href="a00150.html#gb9435261753469accec0c9bf8a5a2686">UDPBUF</a>-&gt;udpchksum = 0xffff;
<a name="l01166"></a>01166 }
<a name="l01167"></a>01167 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
<a name="l01168"></a>01168
<a name="l01169"></a>01169 <span class="keywordflow">goto</span> ip_send_nolen;
<a name="l01170"></a>01170 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
<a name="l01171"></a>01171
<a name="l01172"></a>01172 <span class="comment">/* TCP input processing. */</span>
<a name="l01173"></a>01173 tcp_input:
<a name="l01174"></a>01174 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#e292b8977f6b81265bf14e1676face3e">tcp</a>.<a class="code" href="a00093.html#7f7bb2145afba5df00c6e10ddefa8ae1">recv</a>);
<a name="l01175"></a>01175
<a name="l01176"></a>01176 <span class="comment">/* Start of TCP input header processing code. */</span>
<a name="l01177"></a>01177
<a name="l01178"></a>01178 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g85b65e38aa74eba18979156f97a94a87">uip_tcpchksum</a>() != 0xffff) { <span class="comment">/* Compute and check the TCP</span>
<a name="l01179"></a>01179 <span class="comment"> checksum. */</span>
<a name="l01180"></a>01180 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#e292b8977f6b81265bf14e1676face3e">tcp</a>.<a class="code" href="a00093.html#5d8996950cdf3d8130cc3ad340eb9dff">drop</a>);
<a name="l01181"></a>01181 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#e292b8977f6b81265bf14e1676face3e">tcp</a>.<a class="code" href="a00093.html#7675e6b9adbddbd545d3aac8ca092fbb">chkerr</a>);
<a name="l01182"></a>01182 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"tcp: bad checksum."</span>);
<a name="l01183"></a>01183 <span class="keywordflow">goto</span> drop;
<a name="l01184"></a>01184 }
<a name="l01185"></a>01185
<a name="l01186"></a>01186
<a name="l01187"></a>01187 <span class="comment">/* Demultiplex this segment. */</span>
<a name="l01188"></a>01188 <span class="comment">/* First check any active connections. */</span>
<a name="l01189"></a>01189 <span class="keywordflow">for</span>(uip_connr = &amp;<a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[0]; uip_connr &lt;= &amp;<a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[<a class="code" href="a00153.html#gf5fe83be78b78b9e7d9e7f1e34ab1cc5">UIP_CONNS</a> - 1];
<a name="l01190"></a>01190 ++uip_connr) {
<a name="l01191"></a>01191 <span class="keywordflow">if</span>(uip_connr-&gt;tcpstateflags != <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a> &amp;&amp;
<a name="l01192"></a>01192 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destport == uip_connr-&gt;lport &amp;&amp;
<a name="l01193"></a>01193 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcport == uip_connr-&gt;rport &amp;&amp;
<a name="l01194"></a>01194 <a class="code" href="a00148.html#g210e629f7252e4bc8458cbdf260b3318">uip_ipaddr_cmp</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr, uip_connr-&gt;ripaddr)) {
<a name="l01195"></a>01195 <span class="keywordflow">goto</span> found;
<a name="l01196"></a>01196 }
<a name="l01197"></a>01197 }
<a name="l01198"></a>01198
<a name="l01199"></a>01199 <span class="comment">/* If we didn't find and active connection that expected the packet,</span>
<a name="l01200"></a>01200 <span class="comment"> either this packet is an old duplicate, or this is a SYN packet</span>
<a name="l01201"></a>01201 <span class="comment"> destined for a connection in LISTEN. If the SYN flag isn't set,</span>
<a name="l01202"></a>01202 <span class="comment"> it is an old packet and we send a RST. */</span>
<a name="l01203"></a>01203 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; <a class="code" href="a00150.html#g1425d4a0c2760adb653a04c0fb137a8d">TCP_CTL</a>) != <a class="code" href="a00150.html#g6020613f5062417d9811cfa837215c83">TCP_SYN</a>) {
<a name="l01204"></a>01204 <span class="keywordflow">goto</span> reset;
<a name="l01205"></a>01205 }
<a name="l01206"></a>01206
<a name="l01207"></a>01207 tmp16 = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destport;
<a name="l01208"></a>01208 <span class="comment">/* Next, check listening connections. */</span>
<a name="l01209"></a>01209 <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#g8f4ebd8ef6c0ea665ed351d87fec09fd">UIP_LISTENPORTS</a>; ++c) {
<a name="l01210"></a>01210 <span class="keywordflow">if</span>(tmp16 == <a class="code" href="a00150.html#g236d5c7872f59c8fe7b701c7252b976e">uip_listenports</a>[c])
<a name="l01211"></a>01211 <span class="keywordflow">goto</span> found_listen;
<a name="l01212"></a>01212 }
<a name="l01213"></a>01213
<a name="l01214"></a>01214 <span class="comment">/* No matching connection found, so we send a RST packet. */</span>
<a name="l01215"></a>01215 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#e292b8977f6b81265bf14e1676face3e">tcp</a>.<a class="code" href="a00093.html#e9205a565ea3c911a785fc4e87c91a58">synrst</a>);
<a name="l01216"></a>01216 reset:
<a name="l01217"></a>01217
<a name="l01218"></a>01218 <span class="comment">/* We do not send resets in response to resets. */</span>
<a name="l01219"></a>01219 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; <a class="code" href="a00150.html#g5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a>) {
<a name="l01220"></a>01220 <span class="keywordflow">goto</span> drop;
<a name="l01221"></a>01221 }
<a name="l01222"></a>01222
<a name="l01223"></a>01223 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#e292b8977f6b81265bf14e1676face3e">tcp</a>.<a class="code" href="a00093.html#b6e9a75167bdddd561373bc5b6ef501c">rst</a>);
<a name="l01224"></a>01224
<a name="l01225"></a>01225 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = <a class="code" href="a00150.html#g5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a> | <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>;
<a name="l01226"></a>01226 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = <a class="code" href="a00150.html#g15f2617f7dc1713f9d10282125c6027b">UIP_IPTCPH_LEN</a>;
<a name="l01227"></a>01227 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpoffset = 5 &lt;&lt; 4;
<a name="l01228"></a>01228
<a name="l01229"></a>01229 <span class="comment">/* Flip the seqno and ackno fields in the TCP header. */</span>
<a name="l01230"></a>01230 c = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[3];
<a name="l01231"></a>01231 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[3] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[3];
<a name="l01232"></a>01232 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[3] = c;
<a name="l01233"></a>01233
<a name="l01234"></a>01234 c = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[2];
<a name="l01235"></a>01235 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[2] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[2];
<a name="l01236"></a>01236 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[2] = c;
<a name="l01237"></a>01237
<a name="l01238"></a>01238 c = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[1];
<a name="l01239"></a>01239 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[1] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[1];
<a name="l01240"></a>01240 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[1] = c;
<a name="l01241"></a>01241
<a name="l01242"></a>01242 c = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[0];
<a name="l01243"></a>01243 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[0] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[0];
<a name="l01244"></a>01244 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[0] = c;
<a name="l01245"></a>01245
<a name="l01246"></a>01246 <span class="comment">/* We also have to increase the sequence number we are</span>
<a name="l01247"></a>01247 <span class="comment"> acknowledging. If the least significant byte overflowed, we need</span>
<a name="l01248"></a>01248 <span class="comment"> to propagate the carry to the other bytes as well. */</span>
<a name="l01249"></a>01249 <span class="keywordflow">if</span>(++<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[3] == 0) {
<a name="l01250"></a>01250 <span class="keywordflow">if</span>(++<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[2] == 0) {
<a name="l01251"></a>01251 <span class="keywordflow">if</span>(++<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[1] == 0) {
<a name="l01252"></a>01252 ++<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[0];
<a name="l01253"></a>01253 }
<a name="l01254"></a>01254 }
<a name="l01255"></a>01255 }
<a name="l01256"></a>01256
<a name="l01257"></a>01257 <span class="comment">/* Swap port numbers. */</span>
<a name="l01258"></a>01258 tmp16 = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcport;
<a name="l01259"></a>01259 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcport = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destport;
<a name="l01260"></a>01260 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destport = tmp16;
<a name="l01261"></a>01261
<a name="l01262"></a>01262 <span class="comment">/* Swap IP addresses. */</span>
<a name="l01263"></a>01263 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr, <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr);
<a name="l01264"></a>01264 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr, <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>);
<a name="l01265"></a>01265
<a name="l01266"></a>01266 <span class="comment">/* And send out the RST packet! */</span>
<a name="l01267"></a>01267 <span class="keywordflow">goto</span> tcp_send_noconn;
<a name="l01268"></a>01268
<a name="l01269"></a>01269 <span class="comment">/* This label will be jumped to if we matched the incoming packet</span>
<a name="l01270"></a>01270 <span class="comment"> with a connection in LISTEN. In that case, we should create a new</span>
<a name="l01271"></a>01271 <span class="comment"> connection and send a SYNACK in return. */</span>
<a name="l01272"></a>01272 found_listen:
<a name="l01273"></a>01273 <span class="comment">/* First we check if there are any connections avaliable. Unused</span>
<a name="l01274"></a>01274 <span class="comment"> connections are kept in the same table as used connections, but</span>
<a name="l01275"></a>01275 <span class="comment"> unused ones have the tcpstate set to CLOSED. Also, connections in</span>
<a name="l01276"></a>01276 <span class="comment"> TIME_WAIT are kept track of and we'll use the oldest one if no</span>
<a name="l01277"></a>01277 <span class="comment"> CLOSED connections are found. Thanks to Eddie C. Dost for a very</span>
<a name="l01278"></a>01278 <span class="comment"> nice algorithm for the TIME_WAIT search. */</span>
<a name="l01279"></a>01279 uip_connr = 0;
<a name="l01280"></a>01280 <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#gf5fe83be78b78b9e7d9e7f1e34ab1cc5">UIP_CONNS</a>; ++c) {
<a name="l01281"></a>01281 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[c].<a class="code" href="a00088.html#a5f58074435cdc180f17de69651beebd">tcpstateflags</a> == <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>) {
<a name="l01282"></a>01282 uip_connr = &amp;<a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[c];
<a name="l01283"></a>01283 <span class="keywordflow">break</span>;
<a name="l01284"></a>01284 }
<a name="l01285"></a>01285 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[c].<a class="code" href="a00088.html#a5f58074435cdc180f17de69651beebd">tcpstateflags</a> == <a class="code" href="a00150.html#gfff0ed43201bf1e2020de1a0d6cac070">UIP_TIME_WAIT</a>) {
<a name="l01286"></a>01286 <span class="keywordflow">if</span>(uip_connr == 0 ||
<a name="l01287"></a>01287 <a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[c].<a class="code" href="a00087.html">timer</a> &gt; uip_connr-&gt;<a class="code" href="a00088.html#2d9732cf5752d30bd11cb25dc7d0c8d3">timer</a>) {
<a name="l01288"></a>01288 uip_connr = &amp;<a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[c];
<a name="l01289"></a>01289 }
<a name="l01290"></a>01290 }
<a name="l01291"></a>01291 }
<a name="l01292"></a>01292
<a name="l01293"></a>01293 <span class="keywordflow">if</span>(uip_connr == 0) {
<a name="l01294"></a>01294 <span class="comment">/* All connections are used already, we drop packet and hope that</span>
<a name="l01295"></a>01295 <span class="comment"> the remote end will retransmit the packet at a time when we</span>
<a name="l01296"></a>01296 <span class="comment"> have more spare connections. */</span>
<a name="l01297"></a>01297 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#e292b8977f6b81265bf14e1676face3e">tcp</a>.<a class="code" href="a00093.html#494ea6767a8a8fab7abe96b799d6c3b3">syndrop</a>);
<a name="l01298"></a>01298 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"tcp: found no unused connections."</span>);
<a name="l01299"></a>01299 <span class="keywordflow">goto</span> drop;
<a name="l01300"></a>01300 }
<a name="l01301"></a>01301 <a class="code" href="a00088.html">uip_conn</a> = uip_connr;
<a name="l01302"></a>01302
<a name="l01303"></a>01303 <span class="comment">/* Fill in the necessary fields for the new connection. */</span>
<a name="l01304"></a>01304 uip_connr-&gt;rto = uip_connr-&gt;timer = <a class="code" href="a00153.html#g15de27b044603284f68db05a378235a7">UIP_RTO</a>;
<a name="l01305"></a>01305 uip_connr-&gt;sa = 0;
<a name="l01306"></a>01306 uip_connr-&gt;sv = 4;
<a name="l01307"></a>01307 uip_connr-&gt;nrtx = 0;
<a name="l01308"></a>01308 uip_connr-&gt;lport = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destport;
<a name="l01309"></a>01309 uip_connr-&gt;rport = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcport;
<a name="l01310"></a>01310 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(uip_connr-&gt;ripaddr, <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr);
<a name="l01311"></a>01311 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#ga5e3c856b86725125d19fccc34cd9eb5">UIP_SYN_RCVD</a>;
<a name="l01312"></a>01312
<a name="l01313"></a>01313 uip_connr-&gt;snd_nxt[0] = iss[0];
<a name="l01314"></a>01314 uip_connr-&gt;snd_nxt[1] = iss[1];
<a name="l01315"></a>01315 uip_connr-&gt;snd_nxt[2] = iss[2];
<a name="l01316"></a>01316 uip_connr-&gt;snd_nxt[3] = iss[3];
<a name="l01317"></a>01317 uip_connr-&gt;len = 1;
<a name="l01318"></a>01318
<a name="l01319"></a>01319 <span class="comment">/* rcv_nxt should be the seqno from the incoming packet + 1. */</span>
<a name="l01320"></a>01320 uip_connr-&gt;rcv_nxt[3] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[3];
<a name="l01321"></a>01321 uip_connr-&gt;rcv_nxt[2] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[2];
<a name="l01322"></a>01322 uip_connr-&gt;rcv_nxt[1] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[1];
<a name="l01323"></a>01323 uip_connr-&gt;rcv_nxt[0] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[0];
<a name="l01324"></a>01324 uip_add_rcv_nxt(1);
<a name="l01325"></a>01325
<a name="l01326"></a>01326 <span class="comment">/* Parse the TCP MSS option, if present. */</span>
<a name="l01327"></a>01327 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpoffset &amp; 0xf0) &gt; 0x50) {
<a name="l01328"></a>01328 <span class="keywordflow">for</span>(c = 0; c &lt; ((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpoffset &gt;&gt; 4) - 5) &lt;&lt; 2 ;) {
<a name="l01329"></a>01329 opt = <a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + c];
<a name="l01330"></a>01330 <span class="keywordflow">if</span>(opt == <a class="code" href="a00150.html#g1215163245304bad20d6c5608ad75ab7">TCP_OPT_END</a>) {
<a name="l01331"></a>01331 <span class="comment">/* End of options. */</span>
<a name="l01332"></a>01332 <span class="keywordflow">break</span>;
<a name="l01333"></a>01333 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == <a class="code" href="a00150.html#g9f1822e1d231235edacad691f3cb7bbb">TCP_OPT_NOOP</a>) {
<a name="l01334"></a>01334 ++c;
<a name="l01335"></a>01335 <span class="comment">/* NOP option. */</span>
<a name="l01336"></a>01336 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == <a class="code" href="a00150.html#g691688604655ea8943d15f14c60027d8">TCP_OPT_MSS</a> &amp;&amp;
<a name="l01337"></a>01337 <a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + 1 + c] == <a class="code" href="a00150.html#g12f3bf821224b8e7b48a57ed3cea15cf">TCP_OPT_MSS_LEN</a>) {
<a name="l01338"></a>01338 <span class="comment">/* An MSS option with the right option length. */</span>
<a name="l01339"></a>01339 tmp16 = ((<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>)<a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + 2 + c] &lt;&lt; 8) |
<a name="l01340"></a>01340 (<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>)<a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#g15f2617f7dc1713f9d10282125c6027b">UIP_IPTCPH_LEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + 3 + c];
<a name="l01341"></a>01341 uip_connr-&gt;initialmss = uip_connr-&gt;mss =
<a name="l01342"></a>01342 tmp16 &gt; <a class="code" href="a00153.html#g4910467b83a639f06739c82cd362037e">UIP_TCP_MSS</a>? <a class="code" href="a00153.html#g4910467b83a639f06739c82cd362037e">UIP_TCP_MSS</a>: tmp16;
<a name="l01343"></a>01343
<a name="l01344"></a>01344 <span class="comment">/* And we are done processing options. */</span>
<a name="l01345"></a>01345 <span class="keywordflow">break</span>;
<a name="l01346"></a>01346 } <span class="keywordflow">else</span> {
<a name="l01347"></a>01347 <span class="comment">/* All other options have a length field, so that we easily</span>
<a name="l01348"></a>01348 <span class="comment"> can skip past them. */</span>
<a name="l01349"></a>01349 <span class="keywordflow">if</span>(<a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + 1 + c] == 0) {
<a name="l01350"></a>01350 <span class="comment">/* If the length field is zero, the options are malformed</span>
<a name="l01351"></a>01351 <span class="comment"> and we don't process them further. */</span>
<a name="l01352"></a>01352 <span class="keywordflow">break</span>;
<a name="l01353"></a>01353 }
<a name="l01354"></a>01354 c += <a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + 1 + c];
<a name="l01355"></a>01355 }
<a name="l01356"></a>01356 }
<a name="l01357"></a>01357 }
<a name="l01358"></a>01358
<a name="l01359"></a>01359 <span class="comment">/* Our response will be a SYNACK. */</span>
<a name="l01360"></a>01360 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
<a name="l01361"></a>01361 <span class="preprocessor"></span> tcp_send_synack:
<a name="l01362"></a>01362 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>;
<a name="l01363"></a>01363
<a name="l01364"></a>01364 tcp_send_syn:
<a name="l01365"></a>01365 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags |= <a class="code" href="a00150.html#g6020613f5062417d9811cfa837215c83">TCP_SYN</a>;
<a name="l01366"></a>01366 <span class="preprocessor">#else </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
<a name="l01367"></a>01367 tcp_send_synack:
<a name="l01368"></a>01368 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = <a class="code" href="a00150.html#g6020613f5062417d9811cfa837215c83">TCP_SYN</a> | <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>;
<a name="l01369"></a>01369 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
<a name="l01370"></a>01370
<a name="l01371"></a>01371 <span class="comment">/* We send out the TCP Maximum Segment Size option with our</span>
<a name="l01372"></a>01372 <span class="comment"> SYNACK. */</span>
<a name="l01373"></a>01373 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;optdata[0] = <a class="code" href="a00150.html#g691688604655ea8943d15f14c60027d8">TCP_OPT_MSS</a>;
<a name="l01374"></a>01374 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;optdata[1] = <a class="code" href="a00150.html#g12f3bf821224b8e7b48a57ed3cea15cf">TCP_OPT_MSS_LEN</a>;
<a name="l01375"></a>01375 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;optdata[2] = (<a class="code" href="a00153.html#g4910467b83a639f06739c82cd362037e">UIP_TCP_MSS</a>) / 256;
<a name="l01376"></a>01376 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;optdata[3] = (<a class="code" href="a00153.html#g4910467b83a639f06739c82cd362037e">UIP_TCP_MSS</a>) &amp; 255;
<a name="l01377"></a>01377 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = <a class="code" href="a00150.html#g15f2617f7dc1713f9d10282125c6027b">UIP_IPTCPH_LEN</a> + <a class="code" href="a00150.html#g12f3bf821224b8e7b48a57ed3cea15cf">TCP_OPT_MSS_LEN</a>;
<a name="l01378"></a>01378 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpoffset = ((<a class="code" href="a00150.html#g17d111686f98e4c09db73a770ac3f1a4">UIP_TCPH_LEN</a> + TCP_OPT_MSS_LEN) / 4) &lt;&lt; 4;
<a name="l01379"></a>01379 <span class="keywordflow">goto</span> tcp_send;
<a name="l01380"></a>01380
<a name="l01381"></a>01381 <span class="comment">/* This label will be jumped to if we found an active connection. */</span>
<a name="l01382"></a>01382 found:
<a name="l01383"></a>01383 <a class="code" href="a00088.html">uip_conn</a> = uip_connr;
<a name="l01384"></a>01384 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = 0;
<a name="l01385"></a>01385 <span class="comment">/* We do a very naive form of TCP reset processing; we just accept</span>
<a name="l01386"></a>01386 <span class="comment"> any RST and kill our connection. We should in fact check if the</span>
<a name="l01387"></a>01387 <span class="comment"> sequence number of this reset is wihtin our advertised window</span>
<a name="l01388"></a>01388 <span class="comment"> before we accept the reset. */</span>
<a name="l01389"></a>01389 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; <a class="code" href="a00150.html#g5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a>) {
<a name="l01390"></a>01390 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>;
<a name="l01391"></a>01391 <a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">UIP_LOG</a>(<span class="stringliteral">"tcp: got reset, aborting connection."</span>);
<a name="l01392"></a>01392 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#ga4c4310e54f18541b09e1e251fe7b22d">UIP_ABORT</a>;
<a name="l01393"></a>01393 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l01394"></a>01394 <span class="keywordflow">goto</span> drop;
<a name="l01395"></a>01395 }
<a name="l01396"></a>01396 <span class="comment">/* Calculated the length of the data, if the application has sent</span>
<a name="l01397"></a>01397 <span class="comment"> any data to us. */</span>
<a name="l01398"></a>01398 c = (<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpoffset &gt;&gt; 4) &lt;&lt; 2;
<a name="l01399"></a>01399 <span class="comment">/* uip_len will contain the length of the actual TCP data. This is</span>
<a name="l01400"></a>01400 <span class="comment"> calculated by subtracing the length of the TCP header (in</span>
<a name="l01401"></a>01401 <span class="comment"> c) and the length of the IP header (20 bytes). */</span>
<a name="l01402"></a>01402 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - c - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>;
<a name="l01403"></a>01403
<a name="l01404"></a>01404 <span class="comment">/* First, check if the sequence number of the incoming packet is</span>
<a name="l01405"></a>01405 <span class="comment"> what we're expecting next. If not, we send out an ACK with the</span>
<a name="l01406"></a>01406 <span class="comment"> correct numbers in. */</span>
<a name="l01407"></a>01407 <span class="keywordflow">if</span>(!(((uip_connr-&gt;tcpstateflags &amp; <a class="code" href="a00150.html#g13dfcb4a5f920e108253ade527a66cc2">UIP_TS_MASK</a>) == <a class="code" href="a00150.html#g8af482dec973db57d8b3bd3f69461488">UIP_SYN_SENT</a>) &amp;&amp;
<a name="l01408"></a>01408 ((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; <a class="code" href="a00150.html#g1425d4a0c2760adb653a04c0fb137a8d">TCP_CTL</a>) == (<a class="code" href="a00150.html#g6020613f5062417d9811cfa837215c83">TCP_SYN</a> | <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>)))) {
<a name="l01409"></a>01409 <span class="keywordflow">if</span>((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt; 0 || ((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; (<a class="code" href="a00150.html#g6020613f5062417d9811cfa837215c83">TCP_SYN</a> | <a class="code" href="a00150.html#g88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>)) != 0)) &amp;&amp;
<a name="l01410"></a>01410 (<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[0] != uip_connr-&gt;rcv_nxt[0] ||
<a name="l01411"></a>01411 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[1] != uip_connr-&gt;rcv_nxt[1] ||
<a name="l01412"></a>01412 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[2] != uip_connr-&gt;rcv_nxt[2] ||
<a name="l01413"></a>01413 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[3] != uip_connr-&gt;rcv_nxt[3])) {
<a name="l01414"></a>01414 <span class="keywordflow">goto</span> tcp_send_ack;
<a name="l01415"></a>01415 }
<a name="l01416"></a>01416 }
<a name="l01417"></a>01417
<a name="l01418"></a>01418 <span class="comment">/* Next, check if the incoming segment acknowledges any outstanding</span>
<a name="l01419"></a>01419 <span class="comment"> data. If so, we update the sequence number, reset the length of</span>
<a name="l01420"></a>01420 <span class="comment"> the outstanding data, calculate RTT estimations, and reset the</span>
<a name="l01421"></a>01421 <span class="comment"> retransmission timer. */</span>
<a name="l01422"></a>01422 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>) &amp;&amp; <a class="code" href="a00147.html#gef14e83c046e19ab9fe9d1bbcca276c2">uip_outstanding</a>(uip_connr)) {
<a name="l01423"></a>01423 <a class="code" href="a00150.html#g6832e4d2d046536b6472f7ac92340f68">uip_add32</a>(uip_connr-&gt;snd_nxt, uip_connr-&gt;len);
<a name="l01424"></a>01424
<a name="l01425"></a>01425 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[0] == <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[0] &amp;&amp;
<a name="l01426"></a>01426 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[1] == <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[1] &amp;&amp;
<a name="l01427"></a>01427 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[2] == <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[2] &amp;&amp;
<a name="l01428"></a>01428 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[3] == <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[3]) {
<a name="l01429"></a>01429 <span class="comment">/* Update sequence number. */</span>
<a name="l01430"></a>01430 uip_connr-&gt;snd_nxt[0] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[0];
<a name="l01431"></a>01431 uip_connr-&gt;snd_nxt[1] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[1];
<a name="l01432"></a>01432 uip_connr-&gt;snd_nxt[2] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[2];
<a name="l01433"></a>01433 uip_connr-&gt;snd_nxt[3] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[3];
<a name="l01434"></a>01434
<a name="l01435"></a>01435
<a name="l01436"></a>01436 <span class="comment">/* Do RTT estimation, unless we have done retransmissions. */</span>
<a name="l01437"></a>01437 <span class="keywordflow">if</span>(uip_connr-&gt;nrtx == 0) {
<a name="l01438"></a>01438 <span class="keywordtype">signed</span> <span class="keywordtype">char</span> m;
<a name="l01439"></a>01439 m = uip_connr-&gt;rto - uip_connr-&gt;timer;
<a name="l01440"></a>01440 <span class="comment">/* This is taken directly from VJs original code in his paper */</span>
<a name="l01441"></a>01441 m = m - (uip_connr-&gt;sa &gt;&gt; 3);
<a name="l01442"></a>01442 uip_connr-&gt;sa += m;
<a name="l01443"></a>01443 <span class="keywordflow">if</span>(m &lt; 0) {
<a name="l01444"></a>01444 m = -m;
<a name="l01445"></a>01445 }
<a name="l01446"></a>01446 m = m - (uip_connr-&gt;sv &gt;&gt; 2);
<a name="l01447"></a>01447 uip_connr-&gt;sv += m;
<a name="l01448"></a>01448 uip_connr-&gt;rto = (uip_connr-&gt;sa &gt;&gt; 3) + uip_connr-&gt;sv;
<a name="l01449"></a>01449
<a name="l01450"></a>01450 }
<a name="l01451"></a>01451 <span class="comment">/* Set the acknowledged flag. */</span>
<a name="l01452"></a>01452 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#g6bfa488f87f68a6f7f4a3efb9e45eaf8">UIP_ACKDATA</a>;
<a name="l01453"></a>01453 <span class="comment">/* Reset the retransmission timer. */</span>
<a name="l01454"></a>01454 uip_connr-&gt;timer = uip_connr-&gt;rto;
<a name="l01455"></a>01455
<a name="l01456"></a>01456 <span class="comment">/* Reset length of outstanding data. */</span>
<a name="l01457"></a>01457 uip_connr-&gt;len = 0;
<a name="l01458"></a>01458 }
<a name="l01459"></a>01459
<a name="l01460"></a>01460 }
<a name="l01461"></a>01461
<a name="l01462"></a>01462 <span class="comment">/* Do different things depending on in what state the connection is. */</span>
<a name="l01463"></a>01463 <span class="keywordflow">switch</span>(uip_connr-&gt;tcpstateflags &amp; <a class="code" href="a00150.html#g13dfcb4a5f920e108253ade527a66cc2">UIP_TS_MASK</a>) {
<a name="l01464"></a>01464 <span class="comment">/* CLOSED and LISTEN are not handled here. CLOSE_WAIT is not</span>
<a name="l01465"></a>01465 <span class="comment"> implemented, since we force the application to close when the</span>
<a name="l01466"></a>01466 <span class="comment"> peer sends a FIN (hence the application goes directly from</span>
<a name="l01467"></a>01467 <span class="comment"> ESTABLISHED to LAST_ACK). */</span>
<a name="l01468"></a>01468 <span class="keywordflow">case</span> <a class="code" href="a00150.html#ga5e3c856b86725125d19fccc34cd9eb5">UIP_SYN_RCVD</a>:
<a name="l01469"></a>01469 <span class="comment">/* In SYN_RCVD we have sent out a SYNACK in response to a SYN, and</span>
<a name="l01470"></a>01470 <span class="comment"> we are waiting for an ACK that acknowledges the data we sent</span>
<a name="l01471"></a>01471 <span class="comment"> out the last time. Therefore, we want to have the UIP_ACKDATA</span>
<a name="l01472"></a>01472 <span class="comment"> flag set. If so, we enter the ESTABLISHED state. */</span>
<a name="l01473"></a>01473 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; <a class="code" href="a00150.html#g6bfa488f87f68a6f7f4a3efb9e45eaf8">UIP_ACKDATA</a>) {
<a name="l01474"></a>01474 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#gae59b70658f28ee6e998eaaab05e423f">UIP_ESTABLISHED</a>;
<a name="l01475"></a>01475 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#gf84316f469ce0726985c0702db49a989">UIP_CONNECTED</a>;
<a name="l01476"></a>01476 uip_connr-&gt;len = 0;
<a name="l01477"></a>01477 <span class="keywordflow">if</span>(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt; 0) {
<a name="l01478"></a>01478 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> |= <a class="code" href="a00150.html#g39ce739bd352d7e348e37395ce903e43">UIP_NEWDATA</a>;
<a name="l01479"></a>01479 uip_add_rcv_nxt(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>);
<a name="l01480"></a>01480 }
<a name="l01481"></a>01481 <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = 0;
<a name="l01482"></a>01482 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l01483"></a>01483 <span class="keywordflow">goto</span> appsend;
<a name="l01484"></a>01484 }
<a name="l01485"></a>01485 <span class="keywordflow">goto</span> drop;
<a name="l01486"></a>01486 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
<a name="l01487"></a>01487 <span class="preprocessor"></span> <span class="keywordflow">case</span> <a class="code" href="a00150.html#g8af482dec973db57d8b3bd3f69461488">UIP_SYN_SENT</a>:
<a name="l01488"></a>01488 <span class="comment">/* In SYN_SENT, we wait for a SYNACK that is sent in response to</span>
<a name="l01489"></a>01489 <span class="comment"> our SYN. The rcv_nxt is set to sequence number in the SYNACK</span>
<a name="l01490"></a>01490 <span class="comment"> plus one, and we send an ACK. We move into the ESTABLISHED</span>
<a name="l01491"></a>01491 <span class="comment"> state. */</span>
<a name="l01492"></a>01492 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; UIP_ACKDATA) &amp;&amp;
<a name="l01493"></a>01493 (<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; <a class="code" href="a00150.html#g1425d4a0c2760adb653a04c0fb137a8d">TCP_CTL</a>) == (<a class="code" href="a00150.html#g6020613f5062417d9811cfa837215c83">TCP_SYN</a> | <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>)) {
<a name="l01494"></a>01494
<a name="l01495"></a>01495 <span class="comment">/* Parse the TCP MSS option, if present. */</span>
<a name="l01496"></a>01496 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpoffset &amp; 0xf0) &gt; 0x50) {
<a name="l01497"></a>01497 <span class="keywordflow">for</span>(c = 0; c &lt; ((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpoffset &gt;&gt; 4) - 5) &lt;&lt; 2 ;) {
<a name="l01498"></a>01498 opt = <a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#g15f2617f7dc1713f9d10282125c6027b">UIP_IPTCPH_LEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + c];
<a name="l01499"></a>01499 <span class="keywordflow">if</span>(opt == <a class="code" href="a00150.html#g1215163245304bad20d6c5608ad75ab7">TCP_OPT_END</a>) {
<a name="l01500"></a>01500 <span class="comment">/* End of options. */</span>
<a name="l01501"></a>01501 <span class="keywordflow">break</span>;
<a name="l01502"></a>01502 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == <a class="code" href="a00150.html#g9f1822e1d231235edacad691f3cb7bbb">TCP_OPT_NOOP</a>) {
<a name="l01503"></a>01503 ++c;
<a name="l01504"></a>01504 <span class="comment">/* NOP option. */</span>
<a name="l01505"></a>01505 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == <a class="code" href="a00150.html#g691688604655ea8943d15f14c60027d8">TCP_OPT_MSS</a> &amp;&amp;
<a name="l01506"></a>01506 <a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + 1 + c] == TCP_OPT_MSS_LEN) {
<a name="l01507"></a>01507 <span class="comment">/* An MSS option with the right option length. */</span>
<a name="l01508"></a>01508 tmp16 = (<a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + 2 + c] &lt;&lt; 8) |
<a name="l01509"></a>01509 <a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + 3 + c];
<a name="l01510"></a>01510 uip_connr-&gt;initialmss =
<a name="l01511"></a>01511 uip_connr-&gt;mss = tmp16 &gt; <a class="code" href="a00153.html#g4910467b83a639f06739c82cd362037e">UIP_TCP_MSS</a>? <a class="code" href="a00153.html#g4910467b83a639f06739c82cd362037e">UIP_TCP_MSS</a>: tmp16;
<a name="l01512"></a>01512
<a name="l01513"></a>01513 <span class="comment">/* And we are done processing options. */</span>
<a name="l01514"></a>01514 <span class="keywordflow">break</span>;
<a name="l01515"></a>01515 } <span class="keywordflow">else</span> {
<a name="l01516"></a>01516 <span class="comment">/* All other options have a length field, so that we easily</span>
<a name="l01517"></a>01517 <span class="comment"> can skip past them. */</span>
<a name="l01518"></a>01518 <span class="keywordflow">if</span>(<a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + 1 + c] == 0) {
<a name="l01519"></a>01519 <span class="comment">/* If the length field is zero, the options are malformed</span>
<a name="l01520"></a>01520 <span class="comment"> and we don't process them further. */</span>
<a name="l01521"></a>01521 <span class="keywordflow">break</span>;
<a name="l01522"></a>01522 }
<a name="l01523"></a>01523 c += <a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a> + 1 + c];
<a name="l01524"></a>01524 }
<a name="l01525"></a>01525 }
<a name="l01526"></a>01526 }
<a name="l01527"></a>01527 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#gae59b70658f28ee6e998eaaab05e423f">UIP_ESTABLISHED</a>;
<a name="l01528"></a>01528 uip_connr-&gt;rcv_nxt[0] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[0];
<a name="l01529"></a>01529 uip_connr-&gt;rcv_nxt[1] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[1];
<a name="l01530"></a>01530 uip_connr-&gt;rcv_nxt[2] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[2];
<a name="l01531"></a>01531 uip_connr-&gt;rcv_nxt[3] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[3];
<a name="l01532"></a>01532 uip_add_rcv_nxt(1);
<a name="l01533"></a>01533 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#gf84316f469ce0726985c0702db49a989">UIP_CONNECTED</a> | <a class="code" href="a00150.html#g39ce739bd352d7e348e37395ce903e43">UIP_NEWDATA</a>;
<a name="l01534"></a>01534 uip_connr-&gt;len = 0;
<a name="l01535"></a>01535 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = 0;
<a name="l01536"></a>01536 <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = 0;
<a name="l01537"></a>01537 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l01538"></a>01538 <span class="keywordflow">goto</span> appsend;
<a name="l01539"></a>01539 }
<a name="l01540"></a>01540 <span class="comment">/* Inform the application that the connection failed */</span>
<a name="l01541"></a>01541 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = <a class="code" href="a00150.html#ga4c4310e54f18541b09e1e251fe7b22d">UIP_ABORT</a>;
<a name="l01542"></a>01542 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l01543"></a>01543 <span class="comment">/* The connection is closed after we send the RST */</span>
<a name="l01544"></a>01544 <a class="code" href="a00088.html">uip_conn</a>-&gt;tcpstateflags = <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>;
<a name="l01545"></a>01545 <span class="keywordflow">goto</span> reset;
<a name="l01546"></a>01546 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
<a name="l01547"></a>01547
<a name="l01548"></a>01548 <span class="keywordflow">case</span> <a class="code" href="a00150.html#gae59b70658f28ee6e998eaaab05e423f">UIP_ESTABLISHED</a>:
<a name="l01549"></a>01549 <span class="comment">/* In the ESTABLISHED state, we call upon the application to feed</span>
<a name="l01550"></a>01550 <span class="comment"> data into the uip_buf. If the UIP_ACKDATA flag is set, the</span>
<a name="l01551"></a>01551 <span class="comment"> application should put new data into the buffer, otherwise we are</span>
<a name="l01552"></a>01552 <span class="comment"> retransmitting an old segment, and the application should put that</span>
<a name="l01553"></a>01553 <span class="comment"> data into the buffer.</span>
<a name="l01554"></a>01554 <span class="comment"></span>
<a name="l01555"></a>01555 <span class="comment"> If the incoming packet is a FIN, we should close the connection on</span>
<a name="l01556"></a>01556 <span class="comment"> this side as well, and we send out a FIN and enter the LAST_ACK</span>
<a name="l01557"></a>01557 <span class="comment"> state. We require that there is no outstanding data; otherwise the</span>
<a name="l01558"></a>01558 <span class="comment"> sequence numbers will be screwed up. */</span>
<a name="l01559"></a>01559
<a name="l01560"></a>01560 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; <a class="code" href="a00150.html#g88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a> &amp;&amp; !(uip_connr-&gt;tcpstateflags &amp; <a class="code" href="a00150.html#gde29ec025e6754afd8cc24c954a8dec8">UIP_STOPPED</a>)) {
<a name="l01561"></a>01561 <span class="keywordflow">if</span>(<a class="code" href="a00147.html#gef14e83c046e19ab9fe9d1bbcca276c2">uip_outstanding</a>(uip_connr)) {
<a name="l01562"></a>01562 <span class="keywordflow">goto</span> drop;
<a name="l01563"></a>01563 }
<a name="l01564"></a>01564 uip_add_rcv_nxt(1 + <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>);
<a name="l01565"></a>01565 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> |= <a class="code" href="a00150.html#g57e6dc1d58a36d0ed53a3dd29ccc5798">UIP_CLOSE</a>;
<a name="l01566"></a>01566 <span class="keywordflow">if</span>(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt; 0) {
<a name="l01567"></a>01567 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> |= <a class="code" href="a00150.html#g39ce739bd352d7e348e37395ce903e43">UIP_NEWDATA</a>;
<a name="l01568"></a>01568 }
<a name="l01569"></a>01569 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l01570"></a>01570 uip_connr-&gt;len = 1;
<a name="l01571"></a>01571 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#gd135fb0cfdfb2c212f0f51865a3640e4">UIP_LAST_ACK</a>;
<a name="l01572"></a>01572 uip_connr-&gt;nrtx = 0;
<a name="l01573"></a>01573 tcp_send_finack:
<a name="l01574"></a>01574 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = <a class="code" href="a00150.html#g88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a> | <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>;
<a name="l01575"></a>01575 <span class="keywordflow">goto</span> tcp_send_nodata;
<a name="l01576"></a>01576 }
<a name="l01577"></a>01577
<a name="l01578"></a>01578 <span class="comment">/* Check the URG flag. If this is set, the segment carries urgent</span>
<a name="l01579"></a>01579 <span class="comment"> data that we must pass to the application. */</span>
<a name="l01580"></a>01580 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; <a class="code" href="a00150.html#gc84f499cba8a02fc0e306c10b2acabf0">TCP_URG</a>) != 0) {
<a name="l01581"></a>01581 <span class="preprocessor">#if UIP_URGDATA &gt; 0</span>
<a name="l01582"></a>01582 <span class="preprocessor"></span> uip_urglen = (<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;urgp[0] &lt;&lt; 8) | <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;urgp[1];
<a name="l01583"></a>01583 <span class="keywordflow">if</span>(uip_urglen &gt; <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>) {
<a name="l01584"></a>01584 <span class="comment">/* There is more urgent data in the next segment to come. */</span>
<a name="l01585"></a>01585 uip_urglen = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>;
<a name="l01586"></a>01586 }
<a name="l01587"></a>01587 uip_add_rcv_nxt(uip_urglen);
<a name="l01588"></a>01588 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> -= uip_urglen;
<a name="l01589"></a>01589 uip_urgdata = <a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a>;
<a name="l01590"></a>01590 <a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> += uip_urglen;
<a name="l01591"></a>01591 } <span class="keywordflow">else</span> {
<a name="l01592"></a>01592 uip_urglen = 0;
<a name="l01593"></a>01593 <span class="preprocessor">#else </span><span class="comment">/* UIP_URGDATA &gt; 0 */</span>
<a name="l01594"></a>01594 <a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> = ((<span class="keywordtype">char</span> *)<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a>) + ((<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;urgp[0] &lt;&lt; 8) | <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;urgp[1]);
<a name="l01595"></a>01595 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> -= (<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;urgp[0] &lt;&lt; 8) | <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;urgp[1];
<a name="l01596"></a>01596 #endif <span class="comment">/* UIP_URGDATA &gt; 0 */</span>
<a name="l01597"></a>01597 }
<a name="l01598"></a>01598
<a name="l01599"></a>01599 <span class="comment">/* If uip_len &gt; 0 we have TCP data in the packet, and we flag this</span>
<a name="l01600"></a>01600 <span class="comment"> by setting the UIP_NEWDATA flag and update the sequence number</span>
<a name="l01601"></a>01601 <span class="comment"> we acknowledge. If the application has stopped the dataflow</span>
<a name="l01602"></a>01602 <span class="comment"> using uip_stop(), we must not accept any data packets from the</span>
<a name="l01603"></a>01603 <span class="comment"> remote host. */</span>
<a name="l01604"></a>01604 <span class="keywordflow">if</span>(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt; 0 &amp;&amp; !(uip_connr-&gt;tcpstateflags &amp; <a class="code" href="a00150.html#gde29ec025e6754afd8cc24c954a8dec8">UIP_STOPPED</a>)) {
<a name="l01605"></a>01605 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> |= <a class="code" href="a00150.html#g39ce739bd352d7e348e37395ce903e43">UIP_NEWDATA</a>;
<a name="l01606"></a>01606 uip_add_rcv_nxt(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>);
<a name="l01607"></a>01607 }
<a name="l01608"></a>01608
<a name="l01609"></a>01609 <span class="comment">/* Check if the available buffer space advertised by the other end</span>
<a name="l01610"></a>01610 <span class="comment"> is smaller than the initial MSS for this connection. If so, we</span>
<a name="l01611"></a>01611 <span class="comment"> set the current MSS to the window size to ensure that the</span>
<a name="l01612"></a>01612 <span class="comment"> application does not send more data than the other end can</span>
<a name="l01613"></a>01613 <span class="comment"> handle.</span>
<a name="l01614"></a>01614 <span class="comment"></span>
<a name="l01615"></a>01615 <span class="comment"> If the remote host advertises a zero window, we set the MSS to</span>
<a name="l01616"></a>01616 <span class="comment"> the initial MSS so that the application will send an entire MSS</span>
<a name="l01617"></a>01617 <span class="comment"> of data. This data will not be acknowledged by the receiver,</span>
<a name="l01618"></a>01618 <span class="comment"> and the application will retransmit it. This is called the</span>
<a name="l01619"></a>01619 <span class="comment"> "persistent timer" and uses the retransmission mechanim.</span>
<a name="l01620"></a>01620 <span class="comment"> */</span>
<a name="l01621"></a>01621 tmp16 = ((<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>)<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;wnd[0] &lt;&lt; 8) + (<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>)<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;wnd[1];
<a name="l01622"></a>01622 <span class="keywordflow">if</span>(tmp16 &gt; uip_connr-&gt;initialmss ||
<a name="l01623"></a>01623 tmp16 == 0) {
<a name="l01624"></a>01624 tmp16 = uip_connr-&gt;initialmss;
<a name="l01625"></a>01625 }
<a name="l01626"></a>01626 uip_connr-&gt;mss = tmp16;
<a name="l01627"></a>01627
<a name="l01628"></a>01628 <span class="comment">/* If this packet constitutes an ACK for outstanding data (flagged</span>
<a name="l01629"></a>01629 <span class="comment"> by the UIP_ACKDATA flag, we should call the application since it</span>
<a name="l01630"></a>01630 <span class="comment"> might want to send more data. If the incoming packet had data</span>
<a name="l01631"></a>01631 <span class="comment"> from the peer (as flagged by the UIP_NEWDATA flag), the</span>
<a name="l01632"></a>01632 <span class="comment"> application must also be notified.</span>
<a name="l01633"></a>01633 <span class="comment"></span>
<a name="l01634"></a>01634 <span class="comment"> When the application is called, the global variable uip_len</span>
<a name="l01635"></a>01635 <span class="comment"> contains the length of the incoming data. The application can</span>
<a name="l01636"></a>01636 <span class="comment"> access the incoming data through the global pointer</span>
<a name="l01637"></a>01637 <span class="comment"> uip_appdata, which usually points UIP_IPTCPH_LEN + UIP_LLH_LEN</span>
<a name="l01638"></a>01638 <span class="comment"> bytes into the uip_buf array.</span>
<a name="l01639"></a>01639 <span class="comment"></span>
<a name="l01640"></a>01640 <span class="comment"> If the application wishes to send any data, this data should be</span>
<a name="l01641"></a>01641 <span class="comment"> put into the uip_appdata and the length of the data should be</span>
<a name="l01642"></a>01642 <span class="comment"> put into uip_len. If the application don't have any data to</span>
<a name="l01643"></a>01643 <span class="comment"> send, uip_len must be set to 0. */</span>
<a name="l01644"></a>01644 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; (<a class="code" href="a00150.html#g39ce739bd352d7e348e37395ce903e43">UIP_NEWDATA</a> | UIP_ACKDATA)) {
<a name="l01645"></a>01645 <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = 0;
<a name="l01646"></a>01646 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l01647"></a>01647
<a name="l01648"></a>01648 appsend:
<a name="l01649"></a>01649
<a name="l01650"></a>01650 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; <a class="code" href="a00150.html#ga4c4310e54f18541b09e1e251fe7b22d">UIP_ABORT</a>) {
<a name="l01651"></a>01651 <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = 0;
<a name="l01652"></a>01652 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>;
<a name="l01653"></a>01653 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = <a class="code" href="a00150.html#g5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a> | <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>;
<a name="l01654"></a>01654 <span class="keywordflow">goto</span> tcp_send_nodata;
<a name="l01655"></a>01655 }
<a name="l01656"></a>01656
<a name="l01657"></a>01657 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; <a class="code" href="a00150.html#g57e6dc1d58a36d0ed53a3dd29ccc5798">UIP_CLOSE</a>) {
<a name="l01658"></a>01658 <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = 0;
<a name="l01659"></a>01659 uip_connr-&gt;len = 1;
<a name="l01660"></a>01660 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#ga533c394b1fa0030205534befa31c525">UIP_FIN_WAIT_1</a>;
<a name="l01661"></a>01661 uip_connr-&gt;nrtx = 0;
<a name="l01662"></a>01662 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = <a class="code" href="a00150.html#g88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a> | <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>;
<a name="l01663"></a>01663 <span class="keywordflow">goto</span> tcp_send_nodata;
<a name="l01664"></a>01664 }
<a name="l01665"></a>01665
<a name="l01666"></a>01666 <span class="comment">/* If uip_slen &gt; 0, the application has data to be sent. */</span>
<a name="l01667"></a>01667 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> &gt; 0) {
<a name="l01668"></a>01668
<a name="l01669"></a>01669 <span class="comment">/* If the connection has acknowledged data, the contents of</span>
<a name="l01670"></a>01670 <span class="comment"> the -&gt;len variable should be discarded. */</span>
<a name="l01671"></a>01671 <span class="keywordflow">if</span>((<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; UIP_ACKDATA) != 0) {
<a name="l01672"></a>01672 uip_connr-&gt;len = 0;
<a name="l01673"></a>01673 }
<a name="l01674"></a>01674
<a name="l01675"></a>01675 <span class="comment">/* If the -&gt;len variable is non-zero the connection has</span>
<a name="l01676"></a>01676 <span class="comment"> already data in transit and cannot send anymore right</span>
<a name="l01677"></a>01677 <span class="comment"> now. */</span>
<a name="l01678"></a>01678 <span class="keywordflow">if</span>(uip_connr-&gt;len == 0) {
<a name="l01679"></a>01679
<a name="l01680"></a>01680 <span class="comment">/* The application cannot send more than what is allowed by</span>
<a name="l01681"></a>01681 <span class="comment"> the mss (the minumum of the MSS and the available</span>
<a name="l01682"></a>01682 <span class="comment"> window). */</span>
<a name="l01683"></a>01683 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> &gt; uip_connr-&gt;mss) {
<a name="l01684"></a>01684 <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = uip_connr-&gt;mss;
<a name="l01685"></a>01685 }
<a name="l01686"></a>01686
<a name="l01687"></a>01687 <span class="comment">/* Remember how much data we send out now so that we know</span>
<a name="l01688"></a>01688 <span class="comment"> when everything has been acknowledged. */</span>
<a name="l01689"></a>01689 uip_connr-&gt;len = <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a>;
<a name="l01690"></a>01690 } <span class="keywordflow">else</span> {
<a name="l01691"></a>01691
<a name="l01692"></a>01692 <span class="comment">/* If the application already had unacknowledged data, we</span>
<a name="l01693"></a>01693 <span class="comment"> make sure that the application does not send (i.e.,</span>
<a name="l01694"></a>01694 <span class="comment"> retransmit) out more than it previously sent out. */</span>
<a name="l01695"></a>01695 <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = uip_connr-&gt;len;
<a name="l01696"></a>01696 }
<a name="l01697"></a>01697 }
<a name="l01698"></a>01698 uip_connr-&gt;nrtx = 0;
<a name="l01699"></a>01699 apprexmit:
<a name="l01700"></a>01700 <a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> = <a class="code" href="a00150.html#ga05a3dde2048480fa3ab2a5961898d18">uip_sappdata</a>;
<a name="l01701"></a>01701
<a name="l01702"></a>01702 <span class="comment">/* If the application has data to be sent, or if the incoming</span>
<a name="l01703"></a>01703 <span class="comment"> packet had new data in it, we must send out a packet. */</span>
<a name="l01704"></a>01704 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> &gt; 0 &amp;&amp; uip_connr-&gt;len &gt; 0) {
<a name="l01705"></a>01705 <span class="comment">/* Add the length of the IP and TCP headers. */</span>
<a name="l01706"></a>01706 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = uip_connr-&gt;len + <a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a>;
<a name="l01707"></a>01707 <span class="comment">/* We always set the ACK flag in response packets. */</span>
<a name="l01708"></a>01708 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a> | <a class="code" href="a00150.html#g1320fd0006a2f70138bc2d0018dda829">TCP_PSH</a>;
<a name="l01709"></a>01709 <span class="comment">/* Send the packet. */</span>
<a name="l01710"></a>01710 <span class="keywordflow">goto</span> tcp_send_noopts;
<a name="l01711"></a>01711 }
<a name="l01712"></a>01712 <span class="comment">/* If there is no data to send, just send out a pure ACK if</span>
<a name="l01713"></a>01713 <span class="comment"> there is newdata. */</span>
<a name="l01714"></a>01714 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; <a class="code" href="a00150.html#g39ce739bd352d7e348e37395ce903e43">UIP_NEWDATA</a>) {
<a name="l01715"></a>01715 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = <a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a>;
<a name="l01716"></a>01716 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>;
<a name="l01717"></a>01717 <span class="keywordflow">goto</span> tcp_send_noopts;
<a name="l01718"></a>01718 }
<a name="l01719"></a>01719 }
<a name="l01720"></a>01720 <span class="keywordflow">goto</span> drop;
<a name="l01721"></a>01721 <span class="keywordflow">case</span> <a class="code" href="a00150.html#gd135fb0cfdfb2c212f0f51865a3640e4">UIP_LAST_ACK</a>:
<a name="l01722"></a>01722 <span class="comment">/* We can close this connection if the peer has acknowledged our</span>
<a name="l01723"></a>01723 <span class="comment"> FIN. This is indicated by the UIP_ACKDATA flag. */</span>
<a name="l01724"></a>01724 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; UIP_ACKDATA) {
<a name="l01725"></a>01725 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>;
<a name="l01726"></a>01726 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = UIP_CLOSE;
<a name="l01727"></a>01727 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l01728"></a>01728 }
<a name="l01729"></a>01729 <span class="keywordflow">break</span>;
<a name="l01730"></a>01730
<a name="l01731"></a>01731 <span class="keywordflow">case</span> <a class="code" href="a00150.html#ga533c394b1fa0030205534befa31c525">UIP_FIN_WAIT_1</a>:
<a name="l01732"></a>01732 <span class="comment">/* The application has closed the connection, but the remote host</span>
<a name="l01733"></a>01733 <span class="comment"> hasn't closed its end yet. Thus we do nothing but wait for a</span>
<a name="l01734"></a>01734 <span class="comment"> FIN from the other side. */</span>
<a name="l01735"></a>01735 <span class="keywordflow">if</span>(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt; 0) {
<a name="l01736"></a>01736 uip_add_rcv_nxt(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>);
<a name="l01737"></a>01737 }
<a name="l01738"></a>01738 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; <a class="code" href="a00150.html#g88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {
<a name="l01739"></a>01739 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; UIP_ACKDATA) {
<a name="l01740"></a>01740 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#gfff0ed43201bf1e2020de1a0d6cac070">UIP_TIME_WAIT</a>;
<a name="l01741"></a>01741 uip_connr-&gt;timer = 0;
<a name="l01742"></a>01742 uip_connr-&gt;len = 0;
<a name="l01743"></a>01743 } <span class="keywordflow">else</span> {
<a name="l01744"></a>01744 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#g64d9affc680a445d708234e70450477b">UIP_CLOSING</a>;
<a name="l01745"></a>01745 }
<a name="l01746"></a>01746 uip_add_rcv_nxt(1);
<a name="l01747"></a>01747 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = UIP_CLOSE;
<a name="l01748"></a>01748 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l01749"></a>01749 <span class="keywordflow">goto</span> tcp_send_ack;
<a name="l01750"></a>01750 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; UIP_ACKDATA) {
<a name="l01751"></a>01751 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#g160128ab5d2ea3cc497b91ee4eb4ef99">UIP_FIN_WAIT_2</a>;
<a name="l01752"></a>01752 uip_connr-&gt;len = 0;
<a name="l01753"></a>01753 <span class="keywordflow">goto</span> drop;
<a name="l01754"></a>01754 }
<a name="l01755"></a>01755 <span class="keywordflow">if</span>(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt; 0) {
<a name="l01756"></a>01756 <span class="keywordflow">goto</span> tcp_send_ack;
<a name="l01757"></a>01757 }
<a name="l01758"></a>01758 <span class="keywordflow">goto</span> drop;
<a name="l01759"></a>01759
<a name="l01760"></a>01760 <span class="keywordflow">case</span> <a class="code" href="a00150.html#g160128ab5d2ea3cc497b91ee4eb4ef99">UIP_FIN_WAIT_2</a>:
<a name="l01761"></a>01761 <span class="keywordflow">if</span>(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt; 0) {
<a name="l01762"></a>01762 uip_add_rcv_nxt(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>);
<a name="l01763"></a>01763 }
<a name="l01764"></a>01764 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags &amp; <a class="code" href="a00150.html#g88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {
<a name="l01765"></a>01765 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#gfff0ed43201bf1e2020de1a0d6cac070">UIP_TIME_WAIT</a>;
<a name="l01766"></a>01766 uip_connr-&gt;timer = 0;
<a name="l01767"></a>01767 uip_add_rcv_nxt(1);
<a name="l01768"></a>01768 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = UIP_CLOSE;
<a name="l01769"></a>01769 <a class="code" href="a00153.html#g41aa744caa46913b3b3aedb2a4e78546">UIP_APPCALL</a>();
<a name="l01770"></a>01770 <span class="keywordflow">goto</span> tcp_send_ack;
<a name="l01771"></a>01771 }
<a name="l01772"></a>01772 <span class="keywordflow">if</span>(<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt; 0) {
<a name="l01773"></a>01773 <span class="keywordflow">goto</span> tcp_send_ack;
<a name="l01774"></a>01774 }
<a name="l01775"></a>01775 <span class="keywordflow">goto</span> drop;
<a name="l01776"></a>01776
<a name="l01777"></a>01777 <span class="keywordflow">case</span> <a class="code" href="a00150.html#gfff0ed43201bf1e2020de1a0d6cac070">UIP_TIME_WAIT</a>:
<a name="l01778"></a>01778 <span class="keywordflow">goto</span> tcp_send_ack;
<a name="l01779"></a>01779
<a name="l01780"></a>01780 <span class="keywordflow">case</span> <a class="code" href="a00150.html#g64d9affc680a445d708234e70450477b">UIP_CLOSING</a>:
<a name="l01781"></a>01781 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> &amp; UIP_ACKDATA) {
<a name="l01782"></a>01782 uip_connr-&gt;tcpstateflags = <a class="code" href="a00150.html#gfff0ed43201bf1e2020de1a0d6cac070">UIP_TIME_WAIT</a>;
<a name="l01783"></a>01783 uip_connr-&gt;timer = 0;
<a name="l01784"></a>01784 }
<a name="l01785"></a>01785 }
<a name="l01786"></a>01786 <span class="keywordflow">goto</span> drop;
<a name="l01787"></a>01787
<a name="l01788"></a>01788
<a name="l01789"></a>01789 <span class="comment">/* We jump here when we are ready to send the packet, and just want</span>
<a name="l01790"></a>01790 <span class="comment"> to set the appropriate TCP sequence numbers in the TCP header. */</span>
<a name="l01791"></a>01791 tcp_send_ack:
<a name="l01792"></a>01792 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flags = <a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>;
<a name="l01793"></a>01793 tcp_send_nodata:
<a name="l01794"></a>01794 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = <a class="code" href="a00150.html#g15f2617f7dc1713f9d10282125c6027b">UIP_IPTCPH_LEN</a>;
<a name="l01795"></a>01795 tcp_send_noopts:
<a name="l01796"></a>01796 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpoffset = (<a class="code" href="a00150.html#g17d111686f98e4c09db73a770ac3f1a4">UIP_TCPH_LEN</a> / 4) &lt;&lt; 4;
<a name="l01797"></a>01797 tcp_send:
<a name="l01798"></a>01798 <span class="comment">/* We're done with the input processing. We are now ready to send a</span>
<a name="l01799"></a>01799 <span class="comment"> reply. Our job is to fill in all the fields of the TCP and IP</span>
<a name="l01800"></a>01800 <span class="comment"> headers before calculating the checksum and finally send the</span>
<a name="l01801"></a>01801 <span class="comment"> packet. */</span>
<a name="l01802"></a>01802 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[0] = uip_connr-&gt;rcv_nxt[0];
<a name="l01803"></a>01803 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[1] = uip_connr-&gt;rcv_nxt[1];
<a name="l01804"></a>01804 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[2] = uip_connr-&gt;rcv_nxt[2];
<a name="l01805"></a>01805 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ackno[3] = uip_connr-&gt;rcv_nxt[3];
<a name="l01806"></a>01806
<a name="l01807"></a>01807 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[0] = uip_connr-&gt;snd_nxt[0];
<a name="l01808"></a>01808 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[1] = uip_connr-&gt;snd_nxt[1];
<a name="l01809"></a>01809 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[2] = uip_connr-&gt;snd_nxt[2];
<a name="l01810"></a>01810 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[3] = uip_connr-&gt;snd_nxt[3];
<a name="l01811"></a>01811
<a name="l01812"></a>01812 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;proto = <a class="code" href="a00150.html#g517c770991459cc62dc009c0d3875c6a">UIP_PROTO_TCP</a>;
<a name="l01813"></a>01813
<a name="l01814"></a>01814 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcport = uip_connr-&gt;lport;
<a name="l01815"></a>01815 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destport = uip_connr-&gt;rport;
<a name="l01816"></a>01816
<a name="l01817"></a>01817 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr, <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>);
<a name="l01818"></a>01818 <a class="code" href="a00148.html#g769512993b7b27271909d6daa4748b60">uip_ipaddr_copy</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;destipaddr, uip_connr-&gt;ripaddr);
<a name="l01819"></a>01819
<a name="l01820"></a>01820 <span class="keywordflow">if</span>(uip_connr-&gt;tcpstateflags &amp; <a class="code" href="a00150.html#gde29ec025e6754afd8cc24c954a8dec8">UIP_STOPPED</a>) {
<a name="l01821"></a>01821 <span class="comment">/* If the connection has issued uip_stop(), we advertise a zero</span>
<a name="l01822"></a>01822 <span class="comment"> window so that the remote host will stop sending data. */</span>
<a name="l01823"></a>01823 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;wnd[0] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;wnd[1] = 0;
<a name="l01824"></a>01824 } <span class="keywordflow">else</span> {
<a name="l01825"></a>01825 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;wnd[0] = ((<a class="code" href="a00153.html#g5b9dba2123705bce1ce95c3deca0bdad">UIP_RECEIVE_WINDOW</a>) &gt;&gt; 8);
<a name="l01826"></a>01826 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;wnd[1] = ((<a class="code" href="a00153.html#g5b9dba2123705bce1ce95c3deca0bdad">UIP_RECEIVE_WINDOW</a>) &amp; 0xff);
<a name="l01827"></a>01827 }
<a name="l01828"></a>01828
<a name="l01829"></a>01829 tcp_send_noconn:
<a name="l01830"></a>01830 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ttl = <a class="code" href="a00153.html#gb61381673de27f31848c5396bf0b338e">UIP_TTL</a>;
<a name="l01831"></a>01831 <span class="preprocessor">#if UIP_CONF_IPV6</span>
<a name="l01832"></a>01832 <span class="preprocessor"></span> <span class="comment">/* For IPv6, the IP length field does not include the IPv6 IP header</span>
<a name="l01833"></a>01833 <span class="comment"> length. */</span>
<a name="l01834"></a>01834 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - UIP_IPH_LEN) &gt;&gt; 8);
<a name="l01835"></a>01835 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - UIP_IPH_LEN) &amp; 0xff);
<a name="l01836"></a>01836 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l01837"></a>01837 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] = (<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt;&gt; 8);
<a name="l01838"></a>01838 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] = (<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &amp; 0xff);
<a name="l01839"></a>01839 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l01840"></a>01840
<a name="l01841"></a>01841 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;urgp[0] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;urgp[1] = 0;
<a name="l01842"></a>01842
<a name="l01843"></a>01843 <span class="comment">/* Calculate TCP checksum. */</span>
<a name="l01844"></a>01844 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpchksum = 0;
<a name="l01845"></a>01845 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpchksum = ~(<a class="code" href="a00150.html#g85b65e38aa74eba18979156f97a94a87">uip_tcpchksum</a>());
<a name="l01846"></a>01846
<a name="l01847"></a>01847 ip_send_nolen:
<a name="l01848"></a>01848
<a name="l01849"></a>01849 <span class="preprocessor">#if UIP_CONF_IPV6</span>
<a name="l01850"></a>01850 <span class="preprocessor"></span> <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;vtc = 0x60;
<a name="l01851"></a>01851 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcflow = 0x00;
<a name="l01852"></a>01852 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;flow = 0x00;
<a name="l01853"></a>01853 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l01854"></a>01854 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;vhl = 0x45;
<a name="l01855"></a>01855 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tos = 0;
<a name="l01856"></a>01856 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipoffset[0] = <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipoffset[1] = 0;
<a name="l01857"></a>01857 ++ipid;
<a name="l01858"></a>01858 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipid[0] = ipid &gt;&gt; 8;
<a name="l01859"></a>01859 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipid[1] = ipid &amp; 0xff;
<a name="l01860"></a>01860 <span class="comment">/* Calculate IP checksum. */</span>
<a name="l01861"></a>01861 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipchksum = 0;
<a name="l01862"></a>01862 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipchksum = ~(<a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>());
<a name="l01863"></a>01863 <a class="code" href="a00135.html#534d9e416324fb8ecca6b9cb4b1f6a6a">DEBUG_PRINTF</a>(<span class="stringliteral">"uip ip_send_nolen: chkecum 0x%04x\n"</span>, <a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>());
<a name="l01864"></a>01864 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
<a name="l01865"></a>01865
<a name="l01866"></a>01866 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#e292b8977f6b81265bf14e1676face3e">tcp</a>.<a class="code" href="a00093.html#dc69abadd5aa07c7d74f9292db2cd93c">sent</a>);
<a name="l01867"></a>01867 send:
<a name="l01868"></a>01868 <a class="code" href="a00135.html#534d9e416324fb8ecca6b9cb4b1f6a6a">DEBUG_PRINTF</a>(<span class="stringliteral">"Sending packet with length %d (%d)\n"</span>, <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>,
<a name="l01869"></a>01869 (<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] &lt;&lt; 8) | <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1]);
<a name="l01870"></a>01870
<a name="l01871"></a>01871 <a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">UIP_STAT</a>(++<a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>.<a class="code" href="a00093.html#1deb2899508216804823498a69378118">ip</a>.<a class="code" href="a00093.html#dc69abadd5aa07c7d74f9292db2cd93c">sent</a>);
<a name="l01872"></a>01872 <span class="comment">/* Return and let the caller do the actual transmission. */</span>
<a name="l01873"></a>01873 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = 0;
<a name="l01874"></a>01874 <span class="keywordflow">return</span>;
<a name="l01875"></a>01875 drop:
<a name="l01876"></a>01876 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = 0;
<a name="l01877"></a>01877 <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a> = 0;
<a name="l01878"></a>01878 <span class="keywordflow">return</span>;
<a name="l01879"></a>01879 }
<a name="l01880"></a>01880 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l01881"></a>01881 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
<a name="l01882"></a><a class="code" href="a00150.html#ga22b04cac8cf283ca12f028578bebc06">01882</a> <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> val)
<a name="l01883"></a>01883 {
<a name="l01884"></a>01884 <span class="keywordflow">return</span> <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>(val);
<a name="l01885"></a>01885 }
<a name="l01886"></a>01886 <span class="comment">/*---------------------------------------------------------------------------*/</span>
<a name="l01887"></a>01887 <span class="keywordtype">void</span>
<a name="l01888"></a><a class="code" href="a00150.html#g04b053a623aac7cd4195157d470661b3">01888</a> <a class="code" href="a00147.html#g04b053a623aac7cd4195157d470661b3">uip_send</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *data, <span class="keywordtype">int</span> len)
<a name="l01889"></a>01889 {
<a name="l01890"></a>01890 <span class="keywordflow">if</span>(len &gt; 0) {
<a name="l01891"></a>01891 <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a> = len;
<a name="l01892"></a>01892 <span class="keywordflow">if</span>(data != <a class="code" href="a00150.html#ga05a3dde2048480fa3ab2a5961898d18">uip_sappdata</a>) {
<a name="l01893"></a>01893 memcpy(<a class="code" href="a00150.html#ga05a3dde2048480fa3ab2a5961898d18">uip_sappdata</a>, (data), <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a>);
<a name="l01894"></a>01894 }
<a name="l01895"></a>01895 }
<a name="l01896"></a>01896 }<span class="comment"></span>
<a name="l01897"></a>01897 <span class="comment">/** @} */</span>
</pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Jun 12 10:23:01 2006 for uIP 1.0 by&nbsp;
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address>
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