/a00423_source.html
HTML | 2007 lines | 2006 code | 0 blank | 1 comment | 0 complexity | 44e6f90b79e9e03f4ee7920aec28d317 MD5 | raw file
- <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
- <html xmlns="http://www.w3.org/1999/xhtml">
- <head>
- <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
- <title>Contiki 2.5: core/net/uip.c Source File</title>
- <link href="tabs.css" rel="stylesheet" type="text/css"/>
- <link href="doxygen.css" rel="stylesheet" type="text/css"/>
- </head>
- <body>
- <!-- Generated by Doxygen 1.6.1 -->
- <div class="navigation" id="top">
- <div class="tabs">
- <ul>
- <li><a href="main.html"><span>Main Page</span></a></li>
- <li><a href="pages.html"><span>Related Pages</span></a></li>
- <li><a href="modules.html"><span>Modules</span></a></li>
- <li><a href="annotated.html"><span>Data Structures</span></a></li>
- <li class="current"><a href="files.html"><span>Files</span></a></li>
- <li><a href="dirs.html"><span>Directories</span></a></li>
- <li><a href="examples.html"><span>Examples</span></a></li>
- </ul>
- </div>
- <div class="tabs">
- <ul>
- <li><a href="files.html"><span>File List</span></a></li>
- <li><a href="globals.html"><span>Globals</span></a></li>
- </ul>
- </div>
- <div class="navpath"><a class="el" href="dir_783dcb2b4bcfa12326370fa26c216025.html">core</a> » <a class="el" href="dir_0966c75b31335e5cb5b37dbb7a80da85.html">net</a>
- </div>
- </div>
- <div class="contents">
- <h1>uip.c</h1><a href="a00423.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <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"> * \addtogroup uip</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"></span>
- <a name="l00008"></a>00008 <span class="comment">/**</span>
- <a name="l00009"></a>00009 <span class="comment"> * \file</span>
- <a name="l00010"></a>00010 <span class="comment"> * The uIP TCP/IP stack code.</span>
- <a name="l00011"></a>00011 <span class="comment"> * \author Adam Dunkels <adam@dunkels.com></span>
- <a name="l00012"></a>00012 <span class="comment"> */</span>
- <a name="l00013"></a>00013
- <a name="l00014"></a>00014 <span class="comment">/*</span>
- <a name="l00015"></a>00015 <span class="comment"> * Copyright (c) 2001-2003, Adam Dunkels.</span>
- <a name="l00016"></a>00016 <span class="comment"> * All rights reserved.</span>
- <a name="l00017"></a>00017 <span class="comment"> *</span>
- <a name="l00018"></a>00018 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
- <a name="l00019"></a>00019 <span class="comment"> * modification, are permitted provided that the following conditions</span>
- <a name="l00020"></a>00020 <span class="comment"> * are met:</span>
- <a name="l00021"></a>00021 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
- <a name="l00022"></a>00022 <span class="comment"> * notice, this list of conditions and the following disclaimer.</span>
- <a name="l00023"></a>00023 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
- <a name="l00024"></a>00024 <span class="comment"> * notice, this list of conditions and the following disclaimer in the</span>
- <a name="l00025"></a>00025 <span class="comment"> * documentation and/or other materials provided with the distribution.</span>
- <a name="l00026"></a>00026 <span class="comment"> * 3. The name of the author may not be used to endorse or promote</span>
- <a name="l00027"></a>00027 <span class="comment"> * products derived from this software without specific prior</span>
- <a name="l00028"></a>00028 <span class="comment"> * written permission.</span>
- <a name="l00029"></a>00029 <span class="comment"> *</span>
- <a name="l00030"></a>00030 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS</span>
- <a name="l00031"></a>00031 <span class="comment"> * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span>
- <a name="l00032"></a>00032 <span class="comment"> * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
- <a name="l00033"></a>00033 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY</span>
- <a name="l00034"></a>00034 <span class="comment"> * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
- <a name="l00035"></a>00035 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE</span>
- <a name="l00036"></a>00036 <span class="comment"> * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
- <a name="l00037"></a>00037 <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,</span>
- <a name="l00038"></a>00038 <span class="comment"> * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING</span>
- <a name="l00039"></a>00039 <span class="comment"> * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span>
- <a name="l00040"></a>00040 <span class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
- <a name="l00041"></a>00041 <span class="comment"> *</span>
- <a name="l00042"></a>00042 <span class="comment"> * This file is part of the uIP TCP/IP stack.</span>
- <a name="l00043"></a>00043 <span class="comment"> *</span>
- <a name="l00044"></a>00044 <span class="comment"> * $Id: uip.c,v 1.30 2010/10/19 18:29:04 adamdunkels Exp $</span>
- <a name="l00045"></a>00045 <span class="comment"> *</span>
- <a name="l00046"></a>00046 <span class="comment"> */</span>
- <a name="l00047"></a>00047
- <a name="l00048"></a>00048 <span class="comment">/*</span>
- <a name="l00049"></a>00049 <span class="comment"> * uIP is a small implementation of the IP, UDP and TCP protocols (as</span>
- <a name="l00050"></a>00050 <span class="comment"> * well as some basic ICMP stuff). The implementation couples the IP,</span>
- <a name="l00051"></a>00051 <span class="comment"> * UDP, TCP and the application layers very tightly. To keep the size</span>
- <a name="l00052"></a>00052 <span class="comment"> * of the compiled code down, this code frequently uses the goto</span>
- <a name="l00053"></a>00053 <span class="comment"> * statement. While it would be possible to break the uip_process()</span>
- <a name="l00054"></a>00054 <span class="comment"> * function into many smaller functions, this would increase the code</span>
- <a name="l00055"></a>00055 <span class="comment"> * size because of the overhead of parameter passing and the fact that</span>
- <a name="l00056"></a>00056 <span class="comment"> * the optimier would not be as efficient.</span>
- <a name="l00057"></a>00057 <span class="comment"> *</span>
- <a name="l00058"></a>00058 <span class="comment"> * The principle is that we have a small buffer, called the uip_buf,</span>
- <a name="l00059"></a>00059 <span class="comment"> * in which the device driver puts an incoming packet. The TCP/IP</span>
- <a name="l00060"></a>00060 <span class="comment"> * stack parses the headers in the packet, and calls the</span>
- <a name="l00061"></a>00061 <span class="comment"> * application. If the remote host has sent data to the application,</span>
- <a name="l00062"></a>00062 <span class="comment"> * this data is present in the uip_buf and the application read the</span>
- <a name="l00063"></a>00063 <span class="comment"> * data from there. It is up to the application to put this data into</span>
- <a name="l00064"></a>00064 <span class="comment"> * a byte stream if needed. The application will not be fed with data</span>
- <a name="l00065"></a>00065 <span class="comment"> * that is out of sequence.</span>
- <a name="l00066"></a>00066 <span class="comment"> *</span>
- <a name="l00067"></a>00067 <span class="comment"> * If the application whishes to send data to the peer, it should put</span>
- <a name="l00068"></a>00068 <span class="comment"> * its data into the uip_buf. The uip_appdata pointer points to the</span>
- <a name="l00069"></a>00069 <span class="comment"> * first available byte. The TCP/IP stack will calculate the</span>
- <a name="l00070"></a>00070 <span class="comment"> * checksums, and fill in the necessary header fields and finally send</span>
- <a name="l00071"></a>00071 <span class="comment"> * the packet back to the peer.</span>
- <a name="l00072"></a>00072 <span class="comment">*/</span>
- <a name="l00073"></a>00073
- <a name="l00074"></a>00074 <span class="preprocessor">#include "<a class="code" href="a00424.html" title="Header file for the uIP TCP/IP stack.">net/uip.h</a>"</span>
- <a name="l00075"></a>00075 <span class="preprocessor">#include "<a class="code" href="a00431.html" title="Configuration options for uIP.">net/uipopt.h</a>"</span>
- <a name="l00076"></a>00076 <span class="preprocessor">#include "<a class="code" href="a00428.html" title="Macros and definitions for the ARP module.">net/uip_arp.h</a>"</span>
- <a name="l00077"></a>00077 <span class="preprocessor">#include "<a class="code" href="a00426.html" title="Declarations of architecture specific functions.">net/uip_arch.h</a>"</span>
- <a name="l00078"></a>00078
- <a name="l00079"></a>00079 <span class="preprocessor">#if !UIP_CONF_IPV6 </span><span class="comment">/* If UIP_CONF_IPV6 is defined, we compile the</span>
- <a name="l00080"></a>00080 <span class="comment"> uip6.c file instead of this one. Therefore</span>
- <a name="l00081"></a>00081 <span class="comment"> this #ifndef removes the entire compilation</span>
- <a name="l00082"></a>00082 <span class="comment"> output of the uip.c file */</span>
- <a name="l00083"></a>00083
- <a name="l00084"></a>00084
- <a name="l00085"></a>00085 <span class="preprocessor">#if UIP_CONF_IPV6</span>
- <a name="l00086"></a>00086 <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="a00414.html" title="Header file for database of link-local neighbors, used by IPv6 code and to be used...">net/uip-neighbor.h</a>"</span>
- <a name="l00087"></a>00087 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00088"></a>00088
- <a name="l00089"></a>00089 <span class="preprocessor">#include <string.h></span>
- <a name="l00090"></a>00090
- <a name="l00091"></a>00091 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00092"></a>00092 <span class="comment">/* Variable definitions. */</span>
- <a name="l00093"></a>00093
- <a name="l00094"></a>00094
- <a name="l00095"></a>00095 <span class="comment">/* The IP address of this host. If it is defined to be fixed (by</span>
- <a name="l00096"></a>00096 <span class="comment"> setting UIP_FIXEDADDR to 1 in uipopt.h), the address is set</span>
- <a name="l00097"></a>00097 <span class="comment"> here. Otherwise, the address */</span>
- <a name="l00098"></a>00098 <span class="preprocessor">#if UIP_FIXEDADDR > 0</span>
- <a name="l00099"></a>00099 <span class="preprocessor"></span><span class="keyword">const</span> <a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> uip_hostaddr =
- <a name="l00100"></a>00100 { UIP_IPADDR0, UIP_IPADDR1, UIP_IPADDR2, UIP_IPADDR3 };
- <a name="l00101"></a>00101 <span class="keyword">const</span> <a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> uip_draddr =
- <a name="l00102"></a>00102 { UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3 };
- <a name="l00103"></a>00103 <span class="keyword">const</span> <a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> uip_netmask =
- <a name="l00104"></a>00104 { UIP_NETMASK0, UIP_NETMASK1, UIP_NETMASK2, UIP_NETMASK3 };
- <a name="l00105"></a>00105 <span class="preprocessor">#else</span>
- <a name="l00106"></a>00106 <span class="preprocessor"></span><a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> uip_hostaddr, uip_draddr, uip_netmask;
- <a name="l00107"></a>00107 <span class="preprocessor">#endif </span><span class="comment">/* UIP_FIXEDADDR */</span>
- <a name="l00108"></a>00108
- <a name="l00109"></a>00109 <span class="keyword">const</span> <a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> uip_broadcast_addr =
- <a name="l00110"></a>00110 <span class="preprocessor">#if UIP_CONF_IPV6</span>
- <a name="l00111"></a>00111 <span class="preprocessor"></span> { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
- <a name="l00112"></a>00112 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff } };
- <a name="l00113"></a>00113 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00114"></a>00114 { { 0xff, 0xff, 0xff, 0xff } };
- <a name="l00115"></a>00115 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00116"></a>00116 <span class="keyword">const</span> <a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> uip_all_zeroes_addr = { { 0x0, <span class="comment">/* rest is 0 */</span> } };
- <a name="l00117"></a>00117
- <a name="l00118"></a>00118 <span class="preprocessor">#if UIP_FIXEDETHADDR</span>
- <a name="l00119"></a>00119 <span class="preprocessor"></span><span class="keyword">const</span> <span class="keyword">struct </span><a class="code" href="a00102.html" title="802.3 address">uip_eth_addr</a> uip_ethaddr = {{UIP_ETHADDR0,
- <a name="l00120"></a>00120 UIP_ETHADDR1,
- <a name="l00121"></a>00121 UIP_ETHADDR2,
- <a name="l00122"></a>00122 UIP_ETHADDR3,
- <a name="l00123"></a>00123 UIP_ETHADDR4,
- <a name="l00124"></a>00124 UIP_ETHADDR5}};
- <a name="l00125"></a>00125 <span class="preprocessor">#else</span>
- <a name="l00126"></a>00126 <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00102.html" title="802.3 address">uip_eth_addr</a> uip_ethaddr = {{0,0,0,0,0,0}};
- <a name="l00127"></a>00127 <span class="preprocessor">#endif</span>
- <a name="l00128"></a>00128 <span class="preprocessor"></span>
- <a name="l00129"></a>00129 <span class="comment">/* The packet buffer that contains incoming packets. */</span>
- <a name="l00130"></a><a class="code" href="a01574.html#ga1ff9096f765144168470cfe7ebf75fec">00130</a> <a class="code" href="a00091.html" title="The uIP packet buffer.">uip_buf_t</a> uip_aligned_buf;
- <a name="l00131"></a>00131
- <a name="l00132"></a><a class="code" href="a01684.html#gad5848369ab5b02f2fb02d8390ccbaf79">00132</a> <span class="keywordtype">void</span> *<a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a>; <span class="comment">/* The uip_appdata pointer points to</span>
- <a name="l00133"></a>00133 <span class="comment"> application data. */</span>
- <a name="l00134"></a>00134 <span class="keywordtype">void</span> *uip_sappdata; <span class="comment">/* The uip_appdata pointer points to</span>
- <a name="l00135"></a>00135 <span class="comment"> the application data which is to</span>
- <a name="l00136"></a>00136 <span class="comment"> be sent. */</span>
- <a name="l00137"></a>00137 <span class="preprocessor">#if UIP_URGDATA > 0</span>
- <a name="l00138"></a>00138 <span class="preprocessor"></span><span class="keywordtype">void</span> *uip_urgdata; <span class="comment">/* The uip_urgdata pointer points to</span>
- <a name="l00139"></a>00139 <span class="comment"> urgent data (out-of-band data), if</span>
- <a name="l00140"></a>00140 <span class="comment"> present. */</span>
- <a name="l00141"></a>00141 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> uip_urglen, uip_surglen;
- <a name="l00142"></a>00142 <span class="preprocessor">#endif </span><span class="comment">/* UIP_URGDATA > 0 */</span>
- <a name="l00143"></a>00143
- <a name="l00144"></a><a class="code" href="a01577.html#gac83200aec50ca08f657225b3c5b5c8dc">00144</a> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>, uip_slen;
- <a name="l00145"></a>00145 <span class="comment">/* The uip_len is either 8 or 16 bits,</span>
- <a name="l00146"></a>00146 <span class="comment"> depending on the maximum packet</span>
- <a name="l00147"></a>00147 <span class="comment"> size. */</span>
- <a name="l00148"></a>00148
- <a name="l00149"></a>00149 <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> uip_flags; <span class="comment">/* The uip_flags variable is used for</span>
- <a name="l00150"></a>00150 <span class="comment"> communication between the TCP/IP stack</span>
- <a name="l00151"></a>00151 <span class="comment"> and the application program. */</span>
- <a name="l00152"></a><a class="code" href="a01684.html#ga76f4b1021e1a18d4d857ca8c121ec6e6">00152</a> <span class="keyword">struct </span><a class="code" href="a00092.html" title="Representation of a uIP TCP connection.">uip_conn</a> *<a class="code" href="a00092.html" title="Representation of a uIP TCP connection.">uip_conn</a>; <span class="comment">/* uip_conn always points to the current</span>
- <a name="l00153"></a>00153 <span class="comment"> connection. */</span>
- <a name="l00154"></a>00154
- <a name="l00155"></a>00155 <span class="keyword">struct </span>uip_conn uip_conns[<a class="code" href="a01585.html#gaf5fe83be78b78b9e7d9e7f1e34ab1cc5" title="The maximum number of simultaneously open TCP connections.">UIP_CONNS</a>];
- <a name="l00156"></a>00156 <span class="comment">/* The uip_conns array holds all TCP</span>
- <a name="l00157"></a>00157 <span class="comment"> connections. */</span>
- <a name="l00158"></a>00158 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> uip_listenports[<a class="code" href="a01585.html#ga8f4ebd8ef6c0ea665ed351d87fec09fd" title="The maximum number of simultaneously listening TCP ports.">UIP_LISTENPORTS</a>];
- <a name="l00159"></a>00159 <span class="comment">/* The uip_listenports list all currently</span>
- <a name="l00160"></a>00160 <span class="comment"> listning ports. */</span>
- <a name="l00161"></a>00161 <span class="preprocessor">#if UIP_UDP</span>
- <a name="l00162"></a><a class="code" href="a01684.html#ga210f227119fc972e6222c9cb452e15a9">00162</a> <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00119.html" title="Representation of a uIP UDP connection.">uip_udp_conn</a> *<a class="code" href="a00119.html" title="Representation of a uIP UDP connection.">uip_udp_conn</a>;
- <a name="l00163"></a>00163 <span class="keyword">struct </span>uip_udp_conn uip_udp_conns[<a class="code" href="a01584.html#ga196379ceb1219a99f4495e41ccc9bbfb" title="The maximum amount of concurrent UDP connections.">UIP_UDP_CONNS</a>];
- <a name="l00164"></a>00164 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
- <a name="l00165"></a>00165
- <a name="l00166"></a>00166 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> ipid; <span class="comment">/* Ths ipid variable is an increasing</span>
- <a name="l00167"></a>00167 <span class="comment"> number that is used for the IP ID</span>
- <a name="l00168"></a>00168 <span class="comment"> field. */</span>
- <a name="l00169"></a>00169
- <a name="l00170"></a><a class="code" href="a01573.html#ga22f140b02c354dfebcc7ad481c3bcd68">00170</a> <span class="keywordtype">void</span> <a class="code" href="a01684.html#ga22f140b02c354dfebcc7ad481c3bcd68" title="uIP initialization function.">uip_setipid</a>(<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> <span class="keywordtype">id</span>) { ipid = id; }
- <a name="l00171"></a>00171
- <a name="l00172"></a>00172 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> iss[4]; <span class="comment">/* The iss variable is used for the TCP</span>
- <a name="l00173"></a>00173 <span class="comment"> initial sequence number. */</span>
- <a name="l00174"></a>00174
- <a name="l00175"></a>00175 <span class="preprocessor">#if UIP_ACTIVE_OPEN || UIP_UDP</span>
- <a name="l00176"></a>00176 <span class="preprocessor"></span><span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> lastport; <span class="comment">/* Keeps track of the last port used for</span>
- <a name="l00177"></a>00177 <span class="comment"> a new connection. */</span>
- <a name="l00178"></a>00178 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN || UIP_UDP */</span>
- <a name="l00179"></a>00179
- <a name="l00180"></a>00180 <span class="comment">/* Temporary variables. */</span>
- <a name="l00181"></a><a class="code" href="a01578.html#ga2a0cf5d86c58fab216414ce59bf1fea1">00181</a> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[4];
- <a name="l00182"></a>00182 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> c, opt;
- <a name="l00183"></a>00183 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> tmp16;
- <a name="l00184"></a>00184
- <a name="l00185"></a>00185 <span class="comment">/* Structures and definitions. */</span>
- <a name="l00186"></a>00186 <span class="preprocessor">#define TCP_FIN 0x01</span>
- <a name="l00187"></a>00187 <span class="preprocessor"></span><span class="preprocessor">#define TCP_SYN 0x02</span>
- <a name="l00188"></a>00188 <span class="preprocessor"></span><span class="preprocessor">#define TCP_RST 0x04</span>
- <a name="l00189"></a>00189 <span class="preprocessor"></span><span class="preprocessor">#define TCP_PSH 0x08</span>
- <a name="l00190"></a>00190 <span class="preprocessor"></span><span class="preprocessor">#define TCP_ACK 0x10</span>
- <a name="l00191"></a>00191 <span class="preprocessor"></span><span class="preprocessor">#define TCP_URG 0x20</span>
- <a name="l00192"></a>00192 <span class="preprocessor"></span><span class="preprocessor">#define TCP_CTL 0x3f</span>
- <a name="l00193"></a>00193 <span class="preprocessor"></span>
- <a name="l00194"></a>00194 <span class="preprocessor">#define TCP_OPT_END 0 </span><span class="comment">/* End of TCP options list */</span>
- <a name="l00195"></a>00195 <span class="preprocessor">#define TCP_OPT_NOOP 1 </span><span class="comment">/* "No-operation" TCP option */</span>
- <a name="l00196"></a>00196 <span class="preprocessor">#define TCP_OPT_MSS 2 </span><span class="comment">/* Maximum segment size TCP option */</span>
- <a name="l00197"></a>00197
- <a name="l00198"></a>00198 <span class="preprocessor">#define TCP_OPT_MSS_LEN 4 </span><span class="comment">/* Length of TCP MSS option. */</span>
- <a name="l00199"></a>00199
- <a name="l00200"></a>00200 <span class="preprocessor">#define ICMP_ECHO_REPLY 0</span>
- <a name="l00201"></a>00201 <span class="preprocessor"></span><span class="preprocessor">#define ICMP_ECHO 8</span>
- <a name="l00202"></a>00202 <span class="preprocessor"></span>
- <a name="l00203"></a>00203 <span class="preprocessor">#define ICMP_DEST_UNREACHABLE 3</span>
- <a name="l00204"></a>00204 <span class="preprocessor"></span><span class="preprocessor">#define ICMP_PORT_UNREACHABLE 3</span>
- <a name="l00205"></a>00205 <span class="preprocessor"></span>
- <a name="l00206"></a>00206 <span class="preprocessor">#define ICMP6_ECHO_REPLY 129</span>
- <a name="l00207"></a>00207 <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_ECHO 128</span>
- <a name="l00208"></a>00208 <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_NEIGHBOR_SOLICITATION 135</span>
- <a name="l00209"></a>00209 <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_NEIGHBOR_ADVERTISEMENT 136</span>
- <a name="l00210"></a>00210 <span class="preprocessor"></span>
- <a name="l00211"></a>00211 <span class="preprocessor">#define ICMP6_FLAG_S (1 << 6)</span>
- <a name="l00212"></a>00212 <span class="preprocessor"></span>
- <a name="l00213"></a>00213 <span class="preprocessor">#define ICMP6_OPTION_SOURCE_LINK_ADDRESS 1</span>
- <a name="l00214"></a>00214 <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_OPTION_TARGET_LINK_ADDRESS 2</span>
- <a name="l00215"></a>00215 <span class="preprocessor"></span>
- <a name="l00216"></a>00216
- <a name="l00217"></a>00217 <span class="comment">/* Macros. */</span>
- <a name="l00218"></a>00218 <span class="preprocessor">#define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])</span>
- <a name="l00219"></a>00219 <span class="preprocessor"></span><span class="preprocessor">#define FBUF ((struct uip_tcpip_hdr *)&uip_reassbuf[0])</span>
- <a name="l00220"></a>00220 <span class="preprocessor"></span><span class="preprocessor">#define ICMPBUF ((struct uip_icmpip_hdr *)&uip_buf[UIP_LLH_LEN])</span>
- <a name="l00221"></a>00221 <span class="preprocessor"></span><span class="preprocessor">#define UDPBUF ((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])</span>
- <a name="l00222"></a>00222 <span class="preprocessor"></span>
- <a name="l00223"></a>00223
- <a name="l00224"></a>00224 <span class="preprocessor">#if UIP_STATISTICS == 1</span>
- <a name="l00225"></a>00225 <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00118.html" title="The structure holding the TCP/IP statistics that are gathered if UIP_STATISTICS is...">uip_stats</a> uip_stat;
- <a name="l00226"></a>00226 <span class="preprocessor">#define UIP_STAT(s) s</span>
- <a name="l00227"></a>00227 <span class="preprocessor"></span><span class="preprocessor">#else</span>
- <a name="l00228"></a>00228 <span class="preprocessor"></span><span class="preprocessor">#define UIP_STAT(s)</span>
- <a name="l00229"></a>00229 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* UIP_STATISTICS == 1 */</span>
- <a name="l00230"></a>00230
- <a name="l00231"></a>00231 <span class="preprocessor">#if UIP_LOGGING == 1</span>
- <a name="l00232"></a>00232 <span class="preprocessor"></span><span class="preprocessor">#include <stdio.h></span>
- <a name="l00233"></a>00233 <span class="keywordtype">void</span> <a class="code" href="a01589.html#gab58e1ceb7cb73ca2bcd73146b6c1b4e7" title="Print out a uIP log message.">uip_log</a>(<span class="keywordtype">char</span> *msg);
- <a name="l00234"></a>00234 <span class="preprocessor">#define UIP_LOG(m) uip_log(m)</span>
- <a name="l00235"></a>00235 <span class="preprocessor"></span><span class="preprocessor">#else</span>
- <a name="l00236"></a>00236 <span class="preprocessor"></span><span class="preprocessor">#define UIP_LOG(m)</span>
- <a name="l00237"></a>00237 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* UIP_LOGGING == 1 */</span>
- <a name="l00238"></a>00238
- <a name="l00239"></a>00239 <span class="preprocessor">#if ! UIP_ARCH_ADD32</span>
- <a name="l00240"></a>00240 <span class="preprocessor"></span><span class="keywordtype">void</span>
- <a name="l00241"></a><a class="code" href="a01578.html#ga6832e4d2d046536b6472f7ac92340f68">00241</a> <a class="code" href="a01684.html#ga6832e4d2d046536b6472f7ac92340f68" title="Carry out a 32-bit addition.">uip_add32</a>(<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *op32, <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> op16)
- <a name="l00242"></a>00242 {
- <a name="l00243"></a>00243 <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[3] = op32[3] + (op16 & 0xff);
- <a name="l00244"></a>00244 <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[2] = op32[2] + (op16 >> 8);
- <a name="l00245"></a>00245 uip_acc32[1] = op32[1];
- <a name="l00246"></a>00246 uip_acc32[0] = op32[0];
- <a name="l00247"></a>00247
- <a name="l00248"></a>00248 <span class="keywordflow">if</span>(uip_acc32[2] < (op16 >> 8)) {
- <a name="l00249"></a>00249 ++uip_acc32[1];
- <a name="l00250"></a>00250 <span class="keywordflow">if</span>(uip_acc32[1] == 0) {
- <a name="l00251"></a>00251 ++uip_acc32[0];
- <a name="l00252"></a>00252 }
- <a name="l00253"></a>00253 }
- <a name="l00254"></a>00254
- <a name="l00255"></a>00255
- <a name="l00256"></a>00256 <span class="keywordflow">if</span>(uip_acc32[3] < (op16 & 0xff)) {
- <a name="l00257"></a>00257 ++uip_acc32[2];
- <a name="l00258"></a>00258 <span class="keywordflow">if</span>(uip_acc32[2] == 0) {
- <a name="l00259"></a>00259 ++uip_acc32[1];
- <a name="l00260"></a>00260 <span class="keywordflow">if</span>(uip_acc32[1] == 0) {
- <a name="l00261"></a>00261 ++uip_acc32[0];
- <a name="l00262"></a>00262 }
- <a name="l00263"></a>00263 }
- <a name="l00264"></a>00264 }
- <a name="l00265"></a>00265 }
- <a name="l00266"></a>00266
- <a name="l00267"></a>00267 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ARCH_ADD32 */</span>
- <a name="l00268"></a>00268
- <a name="l00269"></a>00269 <span class="preprocessor">#if ! UIP_ARCH_CHKSUM</span>
- <a name="l00270"></a>00270 <span class="preprocessor"></span><span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00271"></a>00271 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
- <a name="l00272"></a>00272 chksum(<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> sum, <span class="keyword">const</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *data, <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> len)
- <a name="l00273"></a>00273 {
- <a name="l00274"></a>00274 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> t;
- <a name="l00275"></a>00275 <span class="keyword">const</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *dataptr;
- <a name="l00276"></a>00276 <span class="keyword">const</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *last_byte;
- <a name="l00277"></a>00277
- <a name="l00278"></a>00278 dataptr = data;
- <a name="l00279"></a>00279 last_byte = data + len - 1;
- <a name="l00280"></a>00280
- <a name="l00281"></a>00281 <span class="keywordflow">while</span>(dataptr < last_byte) { <span class="comment">/* At least two more bytes */</span>
- <a name="l00282"></a>00282 t = (dataptr[0] << 8) + dataptr[1];
- <a name="l00283"></a>00283 sum += t;
- <a name="l00284"></a>00284 <span class="keywordflow">if</span>(sum < t) {
- <a name="l00285"></a>00285 sum++; <span class="comment">/* carry */</span>
- <a name="l00286"></a>00286 }
- <a name="l00287"></a>00287 dataptr += 2;
- <a name="l00288"></a>00288 }
- <a name="l00289"></a>00289
- <a name="l00290"></a>00290 <span class="keywordflow">if</span>(dataptr == last_byte) {
- <a name="l00291"></a>00291 t = (dataptr[0] << 8) + 0;
- <a name="l00292"></a>00292 sum += t;
- <a name="l00293"></a>00293 <span class="keywordflow">if</span>(sum < t) {
- <a name="l00294"></a>00294 sum++; <span class="comment">/* carry */</span>
- <a name="l00295"></a>00295 }
- <a name="l00296"></a>00296 }
- <a name="l00297"></a>00297
- <a name="l00298"></a>00298 <span class="comment">/* Return sum in host byte order. */</span>
- <a name="l00299"></a>00299 <span class="keywordflow">return</span> sum;
- <a name="l00300"></a>00300 }
- <a name="l00301"></a>00301 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00302"></a>00302 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
- <a name="l00303"></a>00303 <a class="code" href="a01684.html#gab6683dd83fe1c8de9a24086d4b69e907" title="Calculate the Internet checksum over a buffer.">uip_chksum</a>(<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> *data, <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> len)
- <a name="l00304"></a>00304 {
- <a name="l00305"></a>00305 <span class="keywordflow">return</span> <a class="code" href="a01684.html#gae4394b6b3cd81f73b0e64a93e0558e00" title="Convert 16-bit quantity from host byte order to network byte order.">uip_htons</a>(chksum(0, (<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *)data, len));
- <a name="l00306"></a>00306 }
- <a name="l00307"></a>00307 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00308"></a>00308 <span class="preprocessor">#ifndef UIP_ARCH_IPCHKSUM</span>
- <a name="l00309"></a>00309 <span class="preprocessor"></span><a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
- <a name="l00310"></a>00310 <a class="code" href="a01684.html#ga2addf34c7d457c1a7899a7e2171ef1e9" title="Calculate the IP header checksum of the packet header in uip_buf.">uip_ipchksum</a>(<span class="keywordtype">void</span>)
- <a name="l00311"></a>00311 {
- <a name="l00312"></a>00312 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> sum;
- <a name="l00313"></a>00313
- <a name="l00314"></a>00314 sum = chksum(0, &uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a>], UIP_IPH_LEN);
- <a name="l00315"></a>00315 DEBUG_PRINTF(<span class="stringliteral">"uip_ipchksum: sum 0x%04x\n"</span>, sum);
- <a name="l00316"></a>00316 <span class="keywordflow">return</span> (sum == 0) ? 0xffff : <a class="code" href="a01684.html#gae4394b6b3cd81f73b0e64a93e0558e00" title="Convert 16-bit quantity from host byte order to network byte order.">uip_htons</a>(sum);
- <a name="l00317"></a>00317 }
- <a name="l00318"></a>00318 <span class="preprocessor">#endif</span>
- <a name="l00319"></a>00319 <span class="preprocessor"></span><span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00320"></a>00320 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
- <a name="l00321"></a>00321 upper_layer_chksum(<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> proto)
- <a name="l00322"></a>00322 {
- <a name="l00323"></a>00323 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> upper_layer_len;
- <a name="l00324"></a>00324 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> sum;
- <a name="l00325"></a>00325
- <a name="l00326"></a>00326 <span class="preprocessor">#if UIP_CONF_IPV6</span>
- <a name="l00327"></a>00327 <span class="preprocessor"></span> upper_layer_len = (((<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>)(BUF->len[0]) << 8) + BUF->len[1]);
- <a name="l00328"></a>00328 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00329"></a>00329 upper_layer_len = (((<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>)(BUF->len[0]) << 8) + BUF->len[1]) - UIP_IPH_LEN;
- <a name="l00330"></a>00330 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00331"></a>00331
- <a name="l00332"></a>00332 <span class="comment">/* First sum pseudoheader. */</span>
- <a name="l00333"></a>00333
- <a name="l00334"></a>00334 <span class="comment">/* IP protocol and length fields. This addition cannot carry. */</span>
- <a name="l00335"></a>00335 sum = upper_layer_len + proto;
- <a name="l00336"></a>00336 <span class="comment">/* Sum IP source and destination addresses. */</span>
- <a name="l00337"></a>00337 sum = chksum(sum, (<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *)&BUF->srcipaddr, 2 * <span class="keyword">sizeof</span>(<a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a>));
- <a name="l00338"></a>00338
- <a name="l00339"></a>00339 <span class="comment">/* Sum TCP header and data. */</span>
- <a name="l00340"></a>00340 sum = chksum(sum, &uip_buf[UIP_IPH_LEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a>],
- <a name="l00341"></a>00341 upper_layer_len);
- <a name="l00342"></a>00342
- <a name="l00343"></a>00343 <span class="keywordflow">return</span> (sum == 0) ? 0xffff : <a class="code" href="a01684.html#gae4394b6b3cd81f73b0e64a93e0558e00" title="Convert 16-bit quantity from host byte order to network byte order.">uip_htons</a>(sum);
- <a name="l00344"></a>00344 }
- <a name="l00345"></a>00345 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00346"></a>00346 <span class="preprocessor">#if UIP_CONF_IPV6</span>
- <a name="l00347"></a>00347 <span class="preprocessor"></span><a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
- <a name="l00348"></a>00348 <a class="code" href="a01684.html#ga5e6741b8bd3e0961fb87e3f85da27a7f" title="Calculate the ICMP checksum of the packet in uip_buf.">uip_icmp6chksum</a>(<span class="keywordtype">void</span>)
- <a name="l00349"></a>00349 {
- <a name="l00350"></a>00350 <span class="keywordflow">return</span> upper_layer_chksum(UIP_PROTO_ICMP6);
- <a name="l00351"></a>00351
- <a name="l00352"></a>00352 }
- <a name="l00353"></a>00353 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00354"></a>00354 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00355"></a>00355 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
- <a name="l00356"></a>00356 <a class="code" href="a01684.html#ga85b65e38aa74eba18979156f97a94a87" title="Calculate the TCP checksum of the packet in uip_buf and uip_appdata.">uip_tcpchksum</a>(<span class="keywordtype">void</span>)
- <a name="l00357"></a>00357 {
- <a name="l00358"></a>00358 <span class="keywordflow">return</span> upper_layer_chksum(UIP_PROTO_TCP);
- <a name="l00359"></a>00359 }
- <a name="l00360"></a>00360 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00361"></a>00361 <span class="preprocessor">#if UIP_UDP_CHECKSUMS</span>
- <a name="l00362"></a>00362 <span class="preprocessor"></span><a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
- <a name="l00363"></a>00363 <a class="code" href="a01684.html#ga7023a34ba9e9d03b5fbedbcb32924453" title="Calculate the UDP checksum of the packet in uip_buf and uip_appdata.">uip_udpchksum</a>(<span class="keywordtype">void</span>)
- <a name="l00364"></a>00364 {
- <a name="l00365"></a>00365 <span class="keywordflow">return</span> upper_layer_chksum(UIP_PROTO_UDP);
- <a name="l00366"></a>00366 }
- <a name="l00367"></a>00367 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
- <a name="l00368"></a>00368 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ARCH_CHKSUM */</span>
- <a name="l00369"></a>00369 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00370"></a>00370 <span class="keywordtype">void</span>
- <a name="l00371"></a><a class="code" href="a01573.html#gac48ed5f0d27721ef62a3ed02a5ad8d2e">00371</a> <a class="code" href="a01684.html#gac48ed5f0d27721ef62a3ed02a5ad8d2e" title="uIP initialization function.">uip_init</a>(<span class="keywordtype">void</span>)
- <a name="l00372"></a>00372 {
- <a name="l00373"></a>00373 <span class="keywordflow">for</span>(c = 0; c < <a class="code" href="a01585.html#ga8f4ebd8ef6c0ea665ed351d87fec09fd" title="The maximum number of simultaneously listening TCP ports.">UIP_LISTENPORTS</a>; ++c) {
- <a name="l00374"></a>00374 uip_listenports[c] = 0;
- <a name="l00375"></a>00375 }
- <a name="l00376"></a>00376 <span class="keywordflow">for</span>(c = 0; c < <a class="code" href="a01585.html#gaf5fe83be78b78b9e7d9e7f1e34ab1cc5" title="The maximum number of simultaneously open TCP connections.">UIP_CONNS</a>; ++c) {
- <a name="l00377"></a>00377 uip_conns[c].<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
- <a name="l00378"></a>00378 }
- <a name="l00379"></a>00379 <span class="preprocessor">#if UIP_ACTIVE_OPEN || UIP_UDP</span>
- <a name="l00380"></a>00380 <span class="preprocessor"></span> lastport = 1024;
- <a name="l00381"></a>00381 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN || UIP_UDP */</span>
- <a name="l00382"></a>00382
- <a name="l00383"></a>00383 <span class="preprocessor">#if UIP_UDP</span>
- <a name="l00384"></a>00384 <span class="preprocessor"></span> <span class="keywordflow">for</span>(c = 0; c < <a class="code" href="a01584.html#ga196379ceb1219a99f4495e41ccc9bbfb" title="The maximum amount of concurrent UDP connections.">UIP_UDP_CONNS</a>; ++c) {
- <a name="l00385"></a>00385 uip_udp_conns[c].<a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> = 0;
- <a name="l00386"></a>00386 }
- <a name="l00387"></a>00387 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
- <a name="l00388"></a>00388
- <a name="l00389"></a>00389
- <a name="l00390"></a>00390 <span class="comment">/* IPv4 initialization. */</span>
- <a name="l00391"></a>00391 <span class="preprocessor">#if UIP_FIXEDADDR == 0</span>
- <a name="l00392"></a>00392 <span class="preprocessor"></span> <span class="comment">/* uip_hostaddr[0] = uip_hostaddr[1] = 0;*/</span>
- <a name="l00393"></a>00393 <span class="preprocessor">#endif </span><span class="comment">/* UIP_FIXEDADDR */</span>
- <a name="l00394"></a>00394
- <a name="l00395"></a>00395 }
- <a name="l00396"></a>00396 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00397"></a>00397 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
- <a name="l00398"></a>00398 <span class="preprocessor"></span><span class="keyword">struct </span>uip_conn *
- <a name="l00399"></a>00399 <a class="code" href="a01575.html#ga8096b0c4b543dc408f4dd031ddae7240" title="Connect to a remote host using TCP.">uip_connect</a>(<a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> *<a class="code" href="a00092.html#a79510aa86d3fa0a0fc6cfc49b1da7279" title="The IP address of the remote host.">ripaddr</a>, <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> <a class="code" href="a00092.html#a1df6aa054ef2fa634ac4c6f418228285" title="The local remote TCP port, in network byte order.">rport</a>)
- <a name="l00400"></a>00400 {
- <a name="l00401"></a>00401 <span class="keyword">register</span> <span class="keyword">struct </span>uip_conn *conn, *cconn;
- <a name="l00402"></a>00402
- <a name="l00403"></a>00403 <span class="comment">/* Find an unused local port. */</span>
- <a name="l00404"></a>00404 again:
- <a name="l00405"></a>00405 ++lastport;
- <a name="l00406"></a>00406
- <a name="l00407"></a>00407 <span class="keywordflow">if</span>(lastport >= 32000) {
- <a name="l00408"></a>00408 lastport = 4096;
- <a name="l00409"></a>00409 }
- <a name="l00410"></a>00410
- <a name="l00411"></a>00411 <span class="comment">/* Check if this port is already in use, and if so try to find</span>
- <a name="l00412"></a>00412 <span class="comment"> another one. */</span>
- <a name="l00413"></a>00413 <span class="keywordflow">for</span>(c = 0; c < <a class="code" href="a01585.html#gaf5fe83be78b78b9e7d9e7f1e34ab1cc5" title="The maximum number of simultaneously open TCP connections.">UIP_CONNS</a>; ++c) {
- <a name="l00414"></a>00414 conn = &uip_conns[c];
- <a name="l00415"></a>00415 <span class="keywordflow">if</span>(conn-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> != UIP_CLOSED &&
- <a name="l00416"></a>00416 conn-><a class="code" href="a00092.html#a0cd09beee671e7e9efb0b4aced10249e" title="The local TCP port, in network byte order.">lport</a> == <a class="code" href="a01684.html#gae4394b6b3cd81f73b0e64a93e0558e00" title="Convert 16-bit quantity from host byte order to network byte order.">uip_htons</a>(lastport)) {
- <a name="l00417"></a>00417 <span class="keywordflow">goto</span> again;
- <a name="l00418"></a>00418 }
- <a name="l00419"></a>00419 }
- <a name="l00420"></a>00420
- <a name="l00421"></a>00421 conn = 0;
- <a name="l00422"></a>00422 <span class="keywordflow">for</span>(c = 0; c < UIP_CONNS; ++c) {
- <a name="l00423"></a>00423 cconn = &uip_conns[c];
- <a name="l00424"></a>00424 <span class="keywordflow">if</span>(cconn-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_CLOSED) {
- <a name="l00425"></a>00425 conn = cconn;
- <a name="l00426"></a>00426 <span class="keywordflow">break</span>;
- <a name="l00427"></a>00427 }
- <a name="l00428"></a>00428 <span class="keywordflow">if</span>(cconn-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_TIME_WAIT) {
- <a name="l00429"></a>00429 <span class="keywordflow">if</span>(conn == 0 ||
- <a name="l00430"></a>00430 cconn-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> > conn-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a>) {
- <a name="l00431"></a>00431 conn = cconn;
- <a name="l00432"></a>00432 }
- <a name="l00433"></a>00433 }
- <a name="l00434"></a>00434 }
- <a name="l00435"></a>00435
- <a name="l00436"></a>00436 <span class="keywordflow">if</span>(conn == 0) {
- <a name="l00437"></a>00437 <span class="keywordflow">return</span> 0;
- <a name="l00438"></a>00438 }
- <a name="l00439"></a>00439
- <a name="l00440"></a>00440 conn-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_SYN_SENT;
- <a name="l00441"></a>00441
- <a name="l00442"></a>00442 conn-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[0] = iss[0];
- <a name="l00443"></a>00443 conn-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[1] = iss[1];
- <a name="l00444"></a>00444 conn-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[2] = iss[2];
- <a name="l00445"></a>00445 conn-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[3] = iss[3];
- <a name="l00446"></a>00446
- <a name="l00447"></a>00447 conn-><a class="code" href="a00092.html#adb7a3fadb68df5fdd37e8b91a2c751ea" title="Initial maximum segment size for the connection.">initialmss</a> = conn-><a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a> = <a class="code" href="a01585.html#ga4910467b83a639f06739c82cd362037e" title="The TCP maximum segment size.">UIP_TCP_MSS</a>;
- <a name="l00448"></a>00448
- <a name="l00449"></a>00449 conn-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 1; <span class="comment">/* TCP length of the SYN is one. */</span>
- <a name="l00450"></a>00450 conn-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> = 0;
- <a name="l00451"></a>00451 conn-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = 1; <span class="comment">/* Send the SYN next time around. */</span>
- <a name="l00452"></a>00452 conn-><a class="code" href="a00092.html#ae3aa9cc25e45b663e6aabc54c013019e" title="Retransmission time-out.">rto</a> = <a class="code" href="a01585.html#ga15de27b044603284f68db05a378235a7" title="The initial retransmission timeout counted in timer pulses.">UIP_RTO</a>;
- <a name="l00453"></a>00453 conn-><a class="code" href="a00092.html#aef661afb3aa82f0437d2ed8d3c20be76" title="Retransmission time-out calculation state variable.">sa</a> = 0;
- <a name="l00454"></a>00454 conn-><a class="code" href="a00092.html#aeb9fcbd3c9b0a795dcd63f33c323d65c" title="Retransmission time-out calculation state variable.">sv</a> = 16; <span class="comment">/* Initial value of the RTT variance. */</span>
- <a name="l00455"></a>00455 conn-><a class="code" href="a00092.html#a0cd09beee671e7e9efb0b4aced10249e" title="The local TCP port, in network byte order.">lport</a> = <a class="code" href="a01684.html#gae4394b6b3cd81f73b0e64a93e0558e00" title="Convert 16-bit quantity from host byte order to network byte order.">uip_htons</a>(lastport);
- <a name="l00456"></a>00456 conn-><a class="code" href="a00092.html#a1df6aa054ef2fa634ac4c6f418228285" title="The local remote TCP port, in network byte order.">rport</a> = rport;
- <a name="l00457"></a>00457 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&conn-><a class="code" href="a00092.html#a79510aa86d3fa0a0fc6cfc49b1da7279" title="The IP address of the remote host.">ripaddr</a>, ripaddr);
- <a name="l00458"></a>00458
- <a name="l00459"></a>00459 <span class="keywordflow">return</span> conn;
- <a name="l00460"></a>00460 }
- <a name="l00461"></a>00461 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
- <a name="l00462"></a>00462 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00463"></a>00463 <span class="preprocessor">#if UIP_UDP</span>
- <a name="l00464"></a>00464 <span class="preprocessor"></span><span class="keyword">struct </span>uip_udp_conn *
- <a name="l00465"></a><a class="code" href="a01575.html#ga5703bad3c0154b02715260ddf6b612a2">00465</a> <a class="code" href="a01684.html#ga5703bad3c0154b02715260ddf6b612a2" title="Set up a new UDP connection.">uip_udp_new</a>(<span class="keyword">const</span> <a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> *ripaddr, <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> rport)
- <a name="l00466"></a>00466 {
- <a name="l00467"></a>00467 <span class="keyword">register</span> <span class="keyword">struct </span>uip_udp_conn *conn;
- <a name="l00468"></a>00468
- <a name="l00469"></a>00469 <span class="comment">/* Find an unused local port. */</span>
- <a name="l00470"></a>00470 again:
- <a name="l00471"></a>00471 ++lastport;
- <a name="l00472"></a>00472
- <a name="l00473"></a>00473 <span class="keywordflow">if</span>(lastport >= 32000) {
- <a name="l00474"></a>00474 lastport = 4096;
- <a name="l00475"></a>00475 }
- <a name="l00476"></a>00476
- <a name="l00477"></a>00477 <span class="keywordflow">for</span>(c = 0; c < <a class="code" href="a01584.html#ga196379ceb1219a99f4495e41ccc9bbfb" title="The maximum amount of concurrent UDP connections.">UIP_UDP_CONNS</a>; ++c) {
- <a name="l00478"></a>00478 <span class="keywordflow">if</span>(uip_udp_conns[c].<a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> == <a class="code" href="a01684.html#gae4394b6b3cd81f73b0e64a93e0558e00" title="Convert 16-bit quantity from host byte order to network byte order.">uip_htons</a>(lastport)) {
- <a name="l00479"></a>00479 <span class="keywordflow">goto</span> again;
- <a name="l00480"></a>00480 }
- <a name="l00481"></a>00481 }
- <a name="l00482"></a>00482
- <a name="l00483"></a>00483
- <a name="l00484"></a>00484 conn = 0;
- <a name="l00485"></a>00485 <span class="keywordflow">for</span>(c = 0; c < UIP_UDP_CONNS; ++c) {
- <a name="l00486"></a>00486 <span class="keywordflow">if</span>(uip_udp_conns[c].<a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> == 0) {
- <a name="l00487"></a>00487 conn = &uip_udp_conns[c];
- <a name="l00488"></a>00488 <span class="keywordflow">break</span>;
- <a name="l00489"></a>00489 }
- <a name="l00490"></a>00490 }
- <a name="l00491"></a>00491
- <a name="l00492"></a>00492 <span class="keywordflow">if</span>(conn == 0) {
- <a name="l00493"></a>00493 <span class="keywordflow">return</span> 0;
- <a name="l00494"></a>00494 }
- <a name="l00495"></a>00495
- <a name="l00496"></a>00496 conn-><a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> = <a class="code" href="a01576.html#ga703ee949a28cb00b5f8ee54bfe664e8d" title="Convert 16-bit quantity from host byte order to network byte order.">UIP_HTONS</a>(lastport);
- <a name="l00497"></a>00497 conn-><a class="code" href="a00119.html#a280a0c2a93544e597f92bbacf36ee1dc" title="The remote port number in network byte order.">rport</a> = rport;
- <a name="l00498"></a>00498 <span class="keywordflow">if</span>(ripaddr == NULL) {
- <a name="l00499"></a>00499 memset(&conn-><a class="code" href="a00119.html#a8a661a2d544100b82d0d14a1985083d5" title="The IP address of the remote peer.">ripaddr</a>, 0, <span class="keyword">sizeof</span>(<a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a>));
- <a name="l00500"></a>00500 } <span class="keywordflow">else</span> {
- <a name="l00501"></a>00501 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&conn-><a class="code" href="a00119.html#a8a661a2d544100b82d0d14a1985083d5" title="The IP address of the remote peer.">ripaddr</a>, ripaddr);
- <a name="l00502"></a>00502 }
- <a name="l00503"></a>00503 conn-><a class="code" href="a00119.html#a4da1d7815516cd2b5bda3a66fdf05198" title="Default time-to-live.">ttl</a> = <a class="code" href="a01582.html#gab61381673de27f31848c5396bf0b338e" title="The IP TTL (time to live) of IP packets sent by uIP.">UIP_TTL</a>;
- <a name="l00504"></a>00504
- <a name="l00505"></a>00505 <span class="keywordflow">return</span> conn;
- <a name="l00506"></a>00506 }
- <a name="l00507"></a>00507 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
- <a name="l00508"></a>00508 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00509"></a>00509 <span class="keywordtype">void</span>
- <a name="l00510"></a><a class="code" href="a01575.html#gaaa585784b0914cac1d37f07f85457008">00510</a> <a class="code" href="a01684.html#gaaa585784b0914cac1d37f07f85457008" title="Stop listening to the specified port.">uip_unlisten</a>(<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> port)
- <a name="l00511"></a>00511 {
- <a name="l00512"></a>00512 <span class="keywordflow">for</span>(c = 0; c < <a class="code" href="a01585.html#ga8f4ebd8ef6c0ea665ed351d87fec09fd" title="The maximum number of simultaneously listening TCP ports.">UIP_LISTENPORTS</a>; ++c) {
- <a name="l00513"></a>00513 <span class="keywordflow">if</span>(uip_listenports[c] == port) {
- <a name="l00514"></a>00514 uip_listenports[c] = 0;
- <a name="l00515"></a>00515 <span class="keywordflow">return</span>;
- <a name="l00516"></a>00516 }
- <a name="l00517"></a>00517 }
- <a name="l00518"></a>00518 }
- <a name="l00519"></a>00519 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00520"></a>00520 <span class="keywordtype">void</span>
- <a name="l00521"></a><a class="code" href="a01575.html#gadd1ab3704ecd4900eec61a6897d32dc8">00521</a> <a class="code" href="a01684.html#gadd1ab3704ecd4900eec61a6897d32dc8" title="Start listening to the specified port.">uip_listen</a>(<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> port)
- <a name="l00522"></a>00522 {
- <a name="l00523"></a>00523 <span class="keywordflow">for</span>(c = 0; c < <a class="code" href="a01585.html#ga8f4ebd8ef6c0ea665ed351d87fec09fd" title="The maximum number of simultaneously listening TCP ports.">UIP_LISTENPORTS</a>; ++c) {
- <a name="l00524"></a>00524 <span class="keywordflow">if</span>(uip_listenports[c] == 0) {
- <a name="l00525"></a>00525 uip_listenports[c] = port;
- <a name="l00526"></a>00526 <span class="keywordflow">return</span>;
- <a name="l00527"></a>00527 }
- <a name="l00528"></a>00528 }
- <a name="l00529"></a>00529 }
- <a name="l00530"></a>00530 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00531"></a>00531 <span class="comment">/* XXX: IP fragment reassembly: not well-tested. */</span>
- <a name="l00532"></a>00532
- <a name="l00533"></a>00533 <span class="preprocessor">#if UIP_REASSEMBLY && !UIP_CONF_IPV6</span>
- <a name="l00534"></a>00534 <span class="preprocessor"></span><span class="preprocessor">#define UIP_REASS_BUFSIZE (UIP_BUFSIZE - UIP_LLH_LEN)</span>
- <a name="l00535"></a>00535 <span class="preprocessor"></span><span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> uip_reassbuf[UIP_REASS_BUFSIZE];
- <a name="l00536"></a>00536 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> uip_reassbitmap[UIP_REASS_BUFSIZE / (8 * 8)];
- <a name="l00537"></a>00537 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> bitmap_bits[8] = {0xff, 0x7f, 0x3f, 0x1f,
- <a name="l00538"></a>00538 0x0f, 0x07, 0x03, 0x01};
- <a name="l00539"></a>00539 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> uip_reasslen;
- <a name="l00540"></a>00540 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> uip_reassflags;
- <a name="l00541"></a>00541 <span class="preprocessor">#define UIP_REASS_FLAG_LASTFRAG 0x01</span>
- <a name="l00542"></a>00542 <span class="preprocessor"></span><span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> uip_reasstmr;
- <a name="l00543"></a>00543
- <a name="l00544"></a>00544 <span class="preprocessor">#define IP_MF 0x20</span>
- <a name="l00545"></a>00545 <span class="preprocessor"></span>
- <a name="l00546"></a>00546 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a>
- <a name="l00547"></a>00547 uip_reass(<span class="keywordtype">void</span>)
- <a name="l00548"></a>00548 {
- <a name="l00549"></a>00549 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> offset, len;
- <a name="l00550"></a>00550 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> i;
- <a name="l00551"></a>00551
- <a name="l00552"></a>00552 <span class="comment">/* If ip_reasstmr is zero, no packet is present in the buffer, so we</span>
- <a name="l00553"></a>00553 <span class="comment"> write the IP header of the fragment into the reassembly</span>
- <a name="l00554"></a>00554 <span class="comment"> buffer. The timer is updated with the maximum age. */</span>
- <a name="l00555"></a>00555 <span class="keywordflow">if</span>(uip_reasstmr == 0) {
- <a name="l00556"></a>00556 memcpy(uip_reassbuf, &BUF->vhl, UIP_IPH_LEN);
- <a name="l00557"></a>00557 uip_reasstmr = <a class="code" href="a01582.html#gac3882366feda1cb759ccbfe98327a7db" title="The maximum time an IP fragment should wait in the reassembly buffer before it is...">UIP_REASS_MAXAGE</a>;
- <a name="l00558"></a>00558 uip_reassflags = 0;
- <a name="l00559"></a>00559 <span class="comment">/* Clear the bitmap. */</span>
- <a name="l00560"></a>00560 memset(uip_reassbitmap, 0, <span class="keyword">sizeof</span>(uip_reassbitmap));
- <a name="l00561"></a>00561 }
- <a name="l00562"></a>00562
- <a name="l00563"></a>00563 <span class="comment">/* Check if the incoming fragment matches the one currently present</span>
- <a name="l00564"></a>00564 <span class="comment"> in the reasembly buffer. If so, we proceed with copying the</span>
- <a name="l00565"></a>00565 <span class="comment"> fragment into the buffer. */</span>
- <a name="l00566"></a>00566 <span class="keywordflow">if</span>(BUF->srcipaddr[0] == FBUF->srcipaddr[0] &&
- <a name="l00567"></a>00567 BUF->srcipaddr[1] == FBUF->srcipaddr[1] &&
- <a name="l00568"></a>00568 BUF->destipaddr[0] == FBUF->destipaddr[0] &&
- <a name="l00569"></a>00569 BUF->destipaddr[1] == FBUF->destipaddr[1] &&
- <a name="l00570"></a>00570 BUF->ipid[0] == FBUF->ipid[0] &&
- <a name="l00571"></a>00571 BUF->ipid[1] == FBUF->ipid[1]) {
- <a name="l00572"></a>00572
- <a name="l00573"></a>00573 len = (BUF->len[0] << 8) + BUF->len[1] - (BUF->vhl & 0x0f) * 4;
- <a name="l00574"></a>00574 offset = (((BUF->ipoffset[0] & 0x3f) << 8) + BUF->ipoffset[1]) * 8;
- <a name="l00575"></a>00575
- <a name="l00576"></a>00576 <span class="comment">/* If the offset or the offset + fragment length overflows the</span>
- <a name="l00577"></a>00577 <span class="comment"> reassembly buffer, we discard the entire packet. */</span>
- <a name="l00578"></a>00578 <span class="keywordflow">if</span>(offset > UIP_REASS_BUFSIZE ||
- <a name="l00579"></a>00579 offset + len > UIP_REASS_BUFSIZE) {
- <a name="l00580"></a>00580 uip_reasstmr = 0;
- <a name="l00581"></a>00581 <span class="keywordflow">goto</span> nullreturn;
- <a name="l00582"></a>00582 }
- <a name="l00583"></a>00583
- <a name="l00584"></a>00584 <span class="comment">/* Copy the fragment into the reassembly buffer, at the right</span>
- <a name="l00585"></a>00585 <span class="comment"> offset. */</span>
- <a name="l00586"></a>00586 memcpy(&uip_reassbuf[UIP_IPH_LEN + offset],
- <a name="l00587"></a>00587 (<span class="keywordtype">char</span> *)BUF + (<span class="keywordtype">int</span>)((BUF->vhl & 0x0f) * 4),
- <a name="l00588"></a>00588 len);
- <a name="l00589"></a>00589
- <a name="l00590"></a>00590 <span class="comment">/* Update the bitmap. */</span>
- <a name="l00591"></a>00591 <span class="keywordflow">if</span>(offset / (8 * 8) == (offset + len) / (8 * 8)) {
- <a name="l00592"></a>00592 <span class="comment">/* If the two endpoints are in the same byte, we only update</span>
- <a name="l00593"></a>00593 <span class="comment"> that byte. */</span>
- <a name="l00594"></a>00594
- <a name="l00595"></a>00595 uip_reassbitmap[offset / (8 * 8)] |=
- <a name="l00596"></a>00596 bitmap_bits[(offset / 8 ) & 7] &
- <a name="l00597"></a>00597 ~bitmap_bits[((offset + len) / 8 ) & 7];
- <a name="l00598"></a>00598 } <span class="keywordflow">else</span> {
- <a name="l00599"></a>00599 <span class="comment">/* If the two endpoints are in different bytes, we update the</span>
- <a name="l00600"></a>00600 <span class="comment"> bytes in the endpoints and fill the stuff inbetween with</span>
- <a name="l00601"></a>00601 <span class="comment"> 0xff. */</span>
- <a name="l00602"></a>00602 uip_reassbitmap[offset / (8 * 8)] |=
- <a name="l00603"></a>00603 bitmap_bits[(offset / 8 ) & 7];
- <a name="l00604"></a>00604 <span class="keywordflow">for</span>(i = 1 + offset / (8 * 8); i < (offset + len) / (8 * 8); ++i) {
- <a name="l00605"></a>00605 uip_reassbitmap[i] = 0xff;
- <a name="l00606"></a>00606 }
- <a name="l00607"></a>00607 uip_reassbitmap[(offset + len) / (8 * 8)] |=
- <a name="l00608"></a>00608 ~bitmap_bits[((offset + len) / 8 ) & 7];
- <a name="l00609"></a>00609 }
- <a name="l00610"></a>00610
- <a name="l00611"></a>00611 <span class="comment">/* If this fragment has the More Fragments flag set to zero, we</span>
- <a name="l00612"></a>00612 <span class="comment"> know that this is the last fragment, so we can calculate the</span>
- <a name="l00613"></a>00613 <span class="comment"> size of the entire packet. We also set the</span>
- <a name="l00614"></a>00614 <span class="comment"> IP_REASS_FLAG_LASTFRAG flag to indicate that we have received</span>
- <a name="l00615"></a>00615 <span class="comment"> the final fragment. */</span>
- <a name="l00616"></a>00616
- <a name="l00617"></a>00617 <span class="keywordflow">if</span>((BUF->ipoffset[0] & IP_MF) == 0) {
- <a name="l00618"></a>00618 uip_reassflags |= UIP_REASS_FLAG_LASTFRAG;
- <a name="l00619"></a>00619 uip_reasslen = offset + len;
- <a name="l00620"></a>00620 }
- <a name="l00621"></a>00621
- <a name="l00622"></a>00622 <span class="comment">/* Finally, we check if we have a full packet in the buffer. We do</span>
- <a name="l00623"></a>00623 <span class="comment"> this by checking if we have the last fragment and if all bits</span>
- <a name="l00624"></a>00624 <span class="comment"> in the bitmap are set. */</span>
- <a name="l00625"></a>00625 <span class="keywordflow">if</span>(uip_reassflags & UIP_REASS_FLAG_LASTFRAG) {
- <a name="l00626"></a>00626 <span class="comment">/* Check all bytes up to and including all but the last byte in</span>
- <a name="l00627"></a>00627 <span class="comment"> the bitmap. */</span>
- <a name="l00628"></a>00628 <span class="keywordflow">for</span>(i = 0; i < uip_reasslen / (8 * 8) - 1; ++i) {
- <a name="l00629"></a>00629 <span class="keywordflow">if</span>(uip_reassbitmap[i] != 0xff) {
- <a name="l00630"></a>00630 <span class="keywordflow">goto</span> nullreturn;
- <a name="l00631"></a>00631 }
- <a name="l00632"></a>00632 }
- <a name="l00633"></a>00633 <span class="comment">/* Check the last byte in the bitmap. It should contain just the</span>
- <a name="l00634"></a>00634 <span class="comment"> right amount of bits. */</span>
- <a name="l00635"></a>00635 <span class="keywordflow">if</span>(uip_reassbitmap[uip_reasslen / (8 * 8)] !=
- <a name="l00636"></a>00636 (<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a>)~bitmap_bits[uip_reasslen / 8 & 7]) {
- <a name="l00637"></a>00637 <span class="keywordflow">goto</span> nullreturn;
- <a name="l00638"></a>00638 }
- <a name="l00639"></a>00639
- <a name="l00640"></a>00640 <span class="comment">/* If we have come this far, we have a full packet in the</span>
- <a name="l00641"></a>00641 <span class="comment"> buffer, so we allocate a pbuf and copy the packet into it. We</span>
- <a name="l00642"></a>00642 <span class="comment"> also reset the timer. */</span>
- <a name="l00643"></a>00643 uip_reasstmr = 0;
- <a name="l00644"></a>00644 memcpy(BUF, FBUF, uip_reasslen);
- <a name="l00645"></a>00645
- <a name="l00646"></a>00646 <span class="comment">/* Pretend to be a "normal" (i.e., not fragmented) IP packet</span>
- <a name="l00647"></a>00647 <span class="comment"> from now on. */</span>
- <a name="l00648"></a>00648 BUF->ipoffset[0] = BUF->ipoffset[1] = 0;
- <a name="l00649"></a>00649 BUF->len[0] = uip_reasslen >> 8;
- <a name="l00650"></a>00650 BUF->len[1] = uip_reasslen & 0xff;
- <a name="l00651"></a>00651 BUF->ipchksum = 0;
- <a name="l00652"></a>00652 BUF->ipchksum = ~(<a class="code" href="a01684.html#ga2addf34c7d457c1a7899a7e2171ef1e9" title="Calculate the IP header checksum of the packet header in uip_buf.">uip_ipchksum</a>());
- <a name="l00653"></a>00653
- <a name="l00654"></a>00654 <span class="keywordflow">return</span> uip_reasslen;
- <a name="l00655"></a>00655 }
- <a name="l00656"></a>00656 }
- <a name="l00657"></a>00657
- <a name="l00658"></a>00658 nullreturn:
- <a name="l00659"></a>00659 <span class="keywordflow">return</span> 0;
- <a name="l00660"></a>00660 }
- <a name="l00661"></a>00661 <span class="preprocessor">#endif </span><span class="comment">/* UIP_REASSEMBLY */</span>
- <a name="l00662"></a>00662 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00663"></a>00663 <span class="keyword">static</span> <span class="keywordtype">void</span>
- <a name="l00664"></a>00664 uip_add_rcv_nxt(<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> n)
- <a name="l00665"></a>00665 {
- <a name="l00666"></a>00666 <a class="code" href="a01684.html#ga6832e4d2d046536b6472f7ac92340f68" title="Carry out a 32-bit addition.">uip_add32</a>(uip_conn-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>, n);
- <a name="l00667"></a>00667 uip_conn-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[0] = <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[0];
- <a name="l00668"></a>00668 uip_conn-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[1] = <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[1];
- <a name="l00669"></a>00669 uip_conn-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[2] = <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[2];
- <a name="l00670"></a>00670 uip_conn-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[3] = <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[3];
- <a name="l00671"></a>00671 }
- <a name="l00672"></a>00672 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l00673"></a>00673 <span class="keywordtype">void</span>
- <a name="l00674"></a>00674 <a class="code" href="a01684.html#ga266263ac78a1361a2b1d15741d3b0675" title="process the options within a hop by hop or destination option header">uip_process</a>(<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> flag)
- <a name="l00675"></a>00675 {
- <a name="l00676"></a>00676 <span class="keyword">register</span> <span class="keyword">struct </span>uip_conn *uip_connr = uip_conn;
- <a name="l00677"></a>00677
- <a name="l00678"></a>00678 <span class="preprocessor">#if UIP_UDP</span>
- <a name="l00679"></a>00679 <span class="preprocessor"></span> <span class="keywordflow">if</span>(flag == UIP_UDP_SEND_CONN) {
- <a name="l00680"></a>00680 <span class="keywordflow">goto</span> udp_send;
- <a name="l00681"></a>00681 }
- <a name="l00682"></a>00682 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
- <a name="l00683"></a>00683
- <a name="l00684"></a>00684 uip_sappdata = <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = &uip_buf[UIP_IPTCPH_LEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a>];
- <a name="l00685"></a>00685
- <a name="l00686"></a>00686 <span class="comment">/* Check if we were invoked because of a poll request for a</span>
- <a name="l00687"></a>00687 <span class="comment"> particular connection. */</span>
- <a name="l00688"></a>00688 <span class="keywordflow">if</span>(flag == UIP_POLL_REQUEST) {
- <a name="l00689"></a>00689 <span class="keywordflow">if</span>((uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> & UIP_TS_MASK) == UIP_ESTABLISHED &&
- <a name="l00690"></a>00690 !uip_outstanding(uip_connr)) {
- <a name="l00691"></a>00691 uip_flags = UIP_POLL;
- <a name="l00692"></a>00692 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l00693"></a>00693 <span class="keywordflow">goto</span> appsend;
- <a name="l00694"></a>00694 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
- <a name="l00695"></a>00695 <span class="preprocessor"></span> } <span class="keywordflow">else</span> <span class="keywordflow">if</span>((uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> & UIP_TS_MASK) == UIP_SYN_SENT) {
- <a name="l00696"></a>00696 <span class="comment">/* In the SYN_SENT state, we retransmit out SYN. */</span>
- <a name="l00697"></a>00697 BUF->flags = 0;
- <a name="l00698"></a>00698 <span class="keywordflow">goto</span> tcp_send_syn;
- <a name="l00699"></a>00699 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
- <a name="l00700"></a>00700 }
- <a name="l00701"></a>00701 <span class="keywordflow">goto</span> drop;
- <a name="l00702"></a>00702
- <a name="l00703"></a>00703 <span class="comment">/* Check if we were invoked because of the perodic timer fireing. */</span>
- <a name="l00704"></a>00704 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(flag == UIP_TIMER) {
- <a name="l00705"></a>00705 <span class="preprocessor">#if UIP_REASSEMBLY</span>
- <a name="l00706"></a>00706 <span class="preprocessor"></span> <span class="keywordflow">if</span>(uip_reasstmr != 0) {
- <a name="l00707"></a>00707 --uip_reasstmr;
- <a name="l00708"></a>00708 }
- <a name="l00709"></a>00709 <span class="preprocessor">#endif </span><span class="comment">/* UIP_REASSEMBLY */</span>
- <a name="l00710"></a>00710 <span class="comment">/* Increase the initial sequence number. */</span>
- <a name="l00711"></a>00711 <span class="keywordflow">if</span>(++iss[3] == 0) {
- <a name="l00712"></a>00712 <span class="keywordflow">if</span>(++iss[2] == 0) {
- <a name="l00713"></a>00713 <span class="keywordflow">if</span>(++iss[1] == 0) {
- <a name="l00714"></a>00714 ++iss[0];
- <a name="l00715"></a>00715 }
- <a name="l00716"></a>00716 }
- <a name="l00717"></a>00717 }
- <a name="l00718"></a>00718
- <a name="l00719"></a>00719 <span class="comment">/* Reset the length variables. */</span>
- <a name="l00720"></a>00720 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 0;
- <a name="l00721"></a>00721 uip_slen = 0;
- <a name="l00722"></a>00722
- <a name="l00723"></a>00723 <span class="comment">/* Check if the connection is in a state in which we simply wait</span>
- <a name="l00724"></a>00724 <span class="comment"> for the connection to time out. If so, we increase the</span>
- <a name="l00725"></a>00725 <span class="comment"> connection's timer and remove the connection if it times</span>
- <a name="l00726"></a>00726 <span class="comment"> out. */</span>
- <a name="l00727"></a>00727 <span class="keywordflow">if</span>(uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_TIME_WAIT ||
- <a name="l00728"></a>00728 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_FIN_WAIT_2) {
- <a name="l00729"></a>00729 ++(uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a>);
- <a name="l00730"></a>00730 <span class="keywordflow">if</span>(uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> == <a class="code" href="a01585.html#ga2bc3b489923793759526a3181eb667fa" title="How long a connection should stay in the TIME_WAIT state.">UIP_TIME_WAIT_TIMEOUT</a>) {
- <a name="l00731"></a>00731 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
- <a name="l00732"></a>00732 }
- <a name="l00733"></a>00733 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> != UIP_CLOSED) {
- <a name="l00734"></a>00734 <span class="comment">/* If the connection has outstanding data, we increase the</span>
- <a name="l00735"></a>00735 <span class="comment"> connection's timer and see if it has reached the RTO value</span>
- <a name="l00736"></a>00736 <span class="comment"> in which case we retransmit. */</span>
- <a name="l00737"></a>00737
- <a name="l00738"></a>00738 <span class="keywordflow">if</span>(uip_outstanding(uip_connr)) {
- <a name="l00739"></a>00739 <span class="keywordflow">if</span>(uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a>-- == 0) {
- <a name="l00740"></a>00740 <span class="keywordflow">if</span>(uip_connr-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> == <a class="code" href="a01585.html#ga67cf1e0d2324c93f332c1f020c0fe8b3" title="The maximum number of times a segment should be retransmitted before the connection...">UIP_MAXRTX</a> ||
- <a name="l00741"></a>00741 ((uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_SYN_SENT ||
- <a name="l00742"></a>00742 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_SYN_RCVD) &&
- <a name="l00743"></a>00743 uip_connr-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> == <a class="code" href="a01585.html#ga24aa5bc36939cc9a0833e1df01478a7e" title="The maximum number of times a SYN segment should be retransmitted before a connection...">UIP_MAXSYNRTX</a>)) {
- <a name="l00744"></a>00744 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
- <a name="l00745"></a>00745
- <a name="l00746"></a>00746 <span class="comment">/* We call UIP_APPCALL() with uip_flags set to</span>
- <a name="l00747"></a>00747 <span class="comment"> UIP_TIMEDOUT to inform the application that the</span>
- <a name="l00748"></a>00748 <span class="comment"> connection has timed out. */</span>
- <a name="l00749"></a>00749 uip_flags = UIP_TIMEDOUT;
- <a name="l00750"></a>00750 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l00751"></a>00751
- <a name="l00752"></a>00752 <span class="comment">/* We also send a reset packet to the remote host. */</span>
- <a name="l00753"></a>00753 BUF->flags = TCP_RST | TCP_ACK;
- <a name="l00754"></a>00754 <span class="keywordflow">goto</span> tcp_send_nodata;
- <a name="l00755"></a>00755 }
- <a name="l00756"></a>00756
- <a name="l00757"></a>00757 <span class="comment">/* Exponential backoff. */</span>
- <a name="l00758"></a>00758 uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = <a class="code" href="a01585.html#ga15de27b044603284f68db05a378235a7" title="The initial retransmission timeout counted in timer pulses.">UIP_RTO</a> << (uip_connr-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> > 4?
- <a name="l00759"></a>00759 4:
- <a name="l00760"></a>00760 uip_connr-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a>);
- <a name="l00761"></a>00761 ++(uip_connr-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a>);
- <a name="l00762"></a>00762
- <a name="l00763"></a>00763 <span class="comment">/* Ok, so we need to retransmit. We do this differently</span>
- <a name="l00764"></a>00764 <span class="comment"> depending on which state we are in. In ESTABLISHED, we</span>
- <a name="l00765"></a>00765 <span class="comment"> call upon the application so that it may prepare the</span>
- <a name="l00766"></a>00766 <span class="comment"> data for the retransmit. In SYN_RCVD, we resend the</span>
- <a name="l00767"></a>00767 <span class="comment"> SYNACK that we sent earlier and in LAST_ACK we have to</span>
- <a name="l00768"></a>00768 <span class="comment"> retransmit our FINACK. */</span>
- <a name="l00769"></a>00769 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.rexmit);
- <a name="l00770"></a>00770 <span class="keywordflow">switch</span>(uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> & UIP_TS_MASK) {
- <a name="l00771"></a>00771 <span class="keywordflow">case</span> UIP_SYN_RCVD:
- <a name="l00772"></a>00772 <span class="comment">/* In the SYN_RCVD state, we should retransmit our</span>
- <a name="l00773"></a>00773 <span class="comment"> SYNACK. */</span>
- <a name="l00774"></a>00774 <span class="keywordflow">goto</span> tcp_send_synack;
- <a name="l00775"></a>00775
- <a name="l00776"></a>00776 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
- <a name="l00777"></a>00777 <span class="preprocessor"></span> <span class="keywordflow">case</span> UIP_SYN_SENT:
- <a name="l00778"></a>00778 <span class="comment">/* In the SYN_SENT state, we retransmit out SYN. */</span>
- <a name="l00779"></a>00779 BUF->flags = 0;
- <a name="l00780"></a>00780 <span class="keywordflow">goto</span> tcp_send_syn;
- <a name="l00781"></a>00781 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
- <a name="l00782"></a>00782
- <a name="l00783"></a>00783 <span class="keywordflow">case</span> UIP_ESTABLISHED:
- <a name="l00784"></a>00784 <span class="comment">/* In the ESTABLISHED state, we call upon the application</span>
- <a name="l00785"></a>00785 <span class="comment"> to do the actual retransmit after which we jump into</span>
- <a name="l00786"></a>00786 <span class="comment"> the code for sending out the packet (the apprexmit</span>
- <a name="l00787"></a>00787 <span class="comment"> label). */</span>
- <a name="l00788"></a>00788 uip_flags = UIP_REXMIT;
- <a name="l00789"></a>00789 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l00790"></a>00790 <span class="keywordflow">goto</span> apprexmit;
- <a name="l00791"></a>00791
- <a name="l00792"></a>00792 <span class="keywordflow">case</span> UIP_FIN_WAIT_1:
- <a name="l00793"></a>00793 <span class="keywordflow">case</span> UIP_CLOSING:
- <a name="l00794"></a>00794 <span class="keywordflow">case</span> UIP_LAST_ACK:
- <a name="l00795"></a>00795 <span class="comment">/* In all these states we should retransmit a FINACK. */</span>
- <a name="l00796"></a>00796 <span class="keywordflow">goto</span> tcp_send_finack;
- <a name="l00797"></a>00797
- <a name="l00798"></a>00798 }
- <a name="l00799"></a>00799 }
- <a name="l00800"></a>00800 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>((uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> & UIP_TS_MASK) == UIP_ESTABLISHED) {
- <a name="l00801"></a>00801 <span class="comment">/* If there was no need for a retransmission, we poll the</span>
- <a name="l00802"></a>00802 <span class="comment"> application for new data. */</span>
- <a name="l00803"></a>00803 uip_flags = UIP_POLL;
- <a name="l00804"></a>00804 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l00805"></a>00805 <span class="keywordflow">goto</span> appsend;
- <a name="l00806"></a>00806 }
- <a name="l00807"></a>00807 }
- <a name="l00808"></a>00808 <span class="keywordflow">goto</span> drop;
- <a name="l00809"></a>00809 }
- <a name="l00810"></a>00810 <span class="preprocessor">#if UIP_UDP</span>
- <a name="l00811"></a>00811 <span class="preprocessor"></span> <span class="keywordflow">if</span>(flag == UIP_UDP_TIMER) {
- <a name="l00812"></a>00812 <span class="keywordflow">if</span>(uip_udp_conn-><a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> != 0) {
- <a name="l00813"></a>00813 uip_conn = NULL;
- <a name="l00814"></a>00814 uip_sappdata = <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = &uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + UIP_IPUDPH_LEN];
- <a name="l00815"></a>00815 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = uip_slen = 0;
- <a name="l00816"></a>00816 uip_flags = UIP_POLL;
- <a name="l00817"></a>00817 UIP_UDP_APPCALL();
- <a name="l00818"></a>00818 <span class="keywordflow">goto</span> udp_send;
- <a name="l00819"></a>00819 } <span class="keywordflow">else</span> {
- <a name="l00820"></a>00820 <span class="keywordflow">goto</span> drop;
- <a name="l00821"></a>00821 }
- <a name="l00822"></a>00822 }
- <a name="l00823"></a>00823 <span class="preprocessor">#endif</span>
- <a name="l00824"></a>00824 <span class="preprocessor"></span>
- <a name="l00825"></a>00825 <span class="comment">/* This is where the input processing starts. */</span>
- <a name="l00826"></a>00826 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.recv);
- <a name="l00827"></a>00827
- <a name="l00828"></a>00828 <span class="comment">/* Start of IP input header processing code. */</span>
- <a name="l00829"></a>00829
- <a name="l00830"></a>00830 <span class="preprocessor">#if UIP_CONF_IPV6</span>
- <a name="l00831"></a>00831 <span class="preprocessor"></span> <span class="comment">/* Check validity of the IP header. */</span>
- <a name="l00832"></a>00832 <span class="keywordflow">if</span>((BUF->vtc & 0xf0) != 0x60) { <span class="comment">/* IP version and header length. */</span>
- <a name="l00833"></a>00833 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
- <a name="l00834"></a>00834 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.vhlerr);
- <a name="l00835"></a>00835 UIP_LOG(<span class="stringliteral">"ipv6: invalid version."</span>);
- <a name="l00836"></a>00836 <span class="keywordflow">goto</span> drop;
- <a name="l00837"></a>00837 }
- <a name="l00838"></a>00838 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00839"></a>00839 <span class="comment">/* Check validity of the IP header. */</span>
- <a name="l00840"></a>00840 <span class="keywordflow">if</span>(BUF->vhl != 0x45) { <span class="comment">/* IP version and header length. */</span>
- <a name="l00841"></a>00841 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
- <a name="l00842"></a>00842 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.vhlerr);
- <a name="l00843"></a>00843 UIP_LOG(<span class="stringliteral">"ip: invalid version or header length."</span>);
- <a name="l00844"></a>00844 <span class="keywordflow">goto</span> drop;
- <a name="l00845"></a>00845 }
- <a name="l00846"></a>00846 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00847"></a>00847
- <a name="l00848"></a>00848 <span class="comment">/* Check the size of the packet. If the size reported to us in</span>
- <a name="l00849"></a>00849 <span class="comment"> uip_len is smaller the size reported in the IP header, we assume</span>
- <a name="l00850"></a>00850 <span class="comment"> that the packet has been corrupted in transit. If the size of</span>
- <a name="l00851"></a>00851 <span class="comment"> uip_len is larger than the size reported in the IP packet header,</span>
- <a name="l00852"></a>00852 <span class="comment"> the packet has been padded and we set uip_len to the correct</span>
- <a name="l00853"></a>00853 <span class="comment"> value.. */</span>
- <a name="l00854"></a>00854
- <a name="l00855"></a>00855 <span class="keywordflow">if</span>((BUF->len[0] << 8) + BUF->len[1] <= <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>) {
- <a name="l00856"></a>00856 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = (BUF->len[0] << 8) + BUF->len[1];
- <a name="l00857"></a>00857 #<span class="keywordflow">if</span> <a class="code" href="a01583.html#gafb852b97535f9f25eb3874dfa223dc06" title="Do we use IPv6 or not (default: no).">UIP_CONF_IPV6</a>
- <a name="l00858"></a>00858 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> += 40; <span class="comment">/* The length reported in the IPv6 header is the</span>
- <a name="l00859"></a>00859 <span class="comment"> length of the payload that follows the</span>
- <a name="l00860"></a>00860 <span class="comment"> header. However, uIP uses the uip_len variable</span>
- <a name="l00861"></a>00861 <span class="comment"> for holding the size of the entire packet,</span>
- <a name="l00862"></a>00862 <span class="comment"> including the IP header. For IPv4 this is not a</span>
- <a name="l00863"></a>00863 <span class="comment"> problem as the length field in the IPv4 header</span>
- <a name="l00864"></a>00864 <span class="comment"> contains the length of the entire packet. But</span>
- <a name="l00865"></a>00865 <span class="comment"> for IPv6 we need to add the size of the IPv6</span>
- <a name="l00866"></a>00866 <span class="comment"> header (40 bytes). */</span>
- <a name="l00867"></a>00867 #endif <span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00868"></a>00868 } <span class="keywordflow">else</span> {
- <a name="l00869"></a>00869 UIP_LOG(<span class="stringliteral">"ip: packet shorter than reported in IP header."</span>);
- <a name="l00870"></a>00870 <span class="keywordflow">goto</span> drop;
- <a name="l00871"></a>00871 }
- <a name="l00872"></a>00872
- <a name="l00873"></a>00873 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
- <a name="l00874"></a>00874 <span class="preprocessor"></span> <span class="comment">/* Check the fragment flag. */</span>
- <a name="l00875"></a>00875 <span class="keywordflow">if</span>((BUF->ipoffset[0] & 0x3f) != 0 ||
- <a name="l00876"></a>00876 BUF->ipoffset[1] != 0) {
- <a name="l00877"></a>00877 <span class="preprocessor">#if UIP_REASSEMBLY</span>
- <a name="l00878"></a>00878 <span class="preprocessor"></span> <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = uip_reass();
- <a name="l00879"></a>00879 <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> == 0) {
- <a name="l00880"></a>00880 <span class="keywordflow">goto</span> drop;
- <a name="l00881"></a>00881 }
- <a name="l00882"></a>00882 <span class="preprocessor">#else </span><span class="comment">/* UIP_REASSEMBLY */</span>
- <a name="l00883"></a>00883 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
- <a name="l00884"></a>00884 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.fragerr);
- <a name="l00885"></a>00885 UIP_LOG(<span class="stringliteral">"ip: fragment dropped."</span>);
- <a name="l00886"></a>00886 <span class="keywordflow">goto</span> drop;
- <a name="l00887"></a>00887 <span class="preprocessor">#endif </span><span class="comment">/* UIP_REASSEMBLY */</span>
- <a name="l00888"></a>00888 }
- <a name="l00889"></a>00889 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00890"></a>00890
- <a name="l00891"></a>00891 <span class="keywordflow">if</span>(<a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&uip_hostaddr, &uip_all_zeroes_addr)) {
- <a name="l00892"></a>00892 <span class="comment">/* If we are configured to use ping IP address configuration and</span>
- <a name="l00893"></a>00893 <span class="comment"> hasn't been assigned an IP address yet, we accept all ICMP</span>
- <a name="l00894"></a>00894 <span class="comment"> packets. */</span>
- <a name="l00895"></a>00895 <span class="preprocessor">#if UIP_PINGADDRCONF && !UIP_CONF_IPV6</span>
- <a name="l00896"></a>00896 <span class="preprocessor"></span> <span class="keywordflow">if</span>(BUF->proto == UIP_PROTO_ICMP) {
- <a name="l00897"></a>00897 UIP_LOG(<span class="stringliteral">"ip: possible ping config packet received."</span>);
- <a name="l00898"></a>00898 <span class="keywordflow">goto</span> icmp_input;
- <a name="l00899"></a>00899 } <span class="keywordflow">else</span> {
- <a name="l00900"></a>00900 UIP_LOG(<span class="stringliteral">"ip: packet dropped since no address assigned."</span>);
- <a name="l00901"></a>00901 <span class="keywordflow">goto</span> drop;
- <a name="l00902"></a>00902 }
- <a name="l00903"></a>00903 <span class="preprocessor">#endif </span><span class="comment">/* UIP_PINGADDRCONF */</span>
- <a name="l00904"></a>00904
- <a name="l00905"></a>00905 } <span class="keywordflow">else</span> {
- <a name="l00906"></a>00906 <span class="comment">/* If IP broadcast support is configured, we check for a broadcast</span>
- <a name="l00907"></a>00907 <span class="comment"> UDP packet, which may be destined to us. */</span>
- <a name="l00908"></a>00908 <span class="preprocessor">#if UIP_BROADCAST</span>
- <a name="l00909"></a>00909 <span class="preprocessor"></span> DEBUG_PRINTF(<span class="stringliteral">"UDP IP checksum 0x%04x\n"</span>, <a class="code" href="a01684.html#ga2addf34c7d457c1a7899a7e2171ef1e9" title="Calculate the IP header checksum of the packet header in uip_buf.">uip_ipchksum</a>());
- <a name="l00910"></a>00910 <span class="keywordflow">if</span>(BUF->proto == UIP_PROTO_UDP &&
- <a name="l00911"></a>00911 (<a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&BUF->destipaddr, &uip_broadcast_addr) ||
- <a name="l00912"></a>00912 (BUF->destipaddr.u8[0] & 224) == 224)) { <span class="comment">/* XXX this is a</span>
- <a name="l00913"></a>00913 <span class="comment"> hack to be able</span>
- <a name="l00914"></a>00914 <span class="comment"> to receive UDP</span>
- <a name="l00915"></a>00915 <span class="comment"> multicast</span>
- <a name="l00916"></a>00916 <span class="comment"> packets. We check</span>
- <a name="l00917"></a>00917 <span class="comment"> for the bit</span>
- <a name="l00918"></a>00918 <span class="comment"> pattern of the</span>
- <a name="l00919"></a>00919 <span class="comment"> multicast</span>
- <a name="l00920"></a>00920 <span class="comment"> prefix. */</span>
- <a name="l00921"></a>00921 <span class="keywordflow">goto</span> udp_input;
- <a name="l00922"></a>00922 }
- <a name="l00923"></a>00923 <span class="preprocessor">#endif </span><span class="comment">/* UIP_BROADCAST */</span>
- <a name="l00924"></a>00924
- <a name="l00925"></a>00925 <span class="comment">/* Check if the packet is destined for our IP address. */</span>
- <a name="l00926"></a>00926 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
- <a name="l00927"></a>00927 <span class="preprocessor"></span> <span class="keywordflow">if</span>(!<a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&BUF->destipaddr, &uip_hostaddr)) {
- <a name="l00928"></a>00928 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
- <a name="l00929"></a>00929 <span class="keywordflow">goto</span> drop;
- <a name="l00930"></a>00930 }
- <a name="l00931"></a>00931 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00932"></a>00932 <span class="comment">/* For IPv6, packet reception is a little trickier as we need to</span>
- <a name="l00933"></a>00933 <span class="comment"> make sure that we listen to certain multicast addresses (all</span>
- <a name="l00934"></a>00934 <span class="comment"> hosts multicast address, and the solicited-node multicast</span>
- <a name="l00935"></a>00935 <span class="comment"> address) as well. However, we will cheat here and accept all</span>
- <a name="l00936"></a>00936 <span class="comment"> multicast packets that are sent to the ff02::/16 addresses. */</span>
- <a name="l00937"></a>00937 <span class="keywordflow">if</span>(!<a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&BUF->destipaddr, &uip_hostaddr) &&
- <a name="l00938"></a>00938 BUF->destipaddr.u16[0] != <a class="code" href="a01576.html#ga703ee949a28cb00b5f8ee54bfe664e8d" title="Convert 16-bit quantity from host byte order to network byte order.">UIP_HTONS</a>(0xff02)) {
- <a name="l00939"></a>00939 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
- <a name="l00940"></a>00940 <span class="keywordflow">goto</span> drop;
- <a name="l00941"></a>00941 }
- <a name="l00942"></a>00942 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00943"></a>00943 }
- <a name="l00944"></a>00944
- <a name="l00945"></a>00945 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
- <a name="l00946"></a>00946 <span class="preprocessor"></span> <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga2addf34c7d457c1a7899a7e2171ef1e9" title="Calculate the IP header checksum of the packet header in uip_buf.">uip_ipchksum</a>() != 0xffff) { <span class="comment">/* Compute and check the IP header</span>
- <a name="l00947"></a>00947 <span class="comment"> checksum. */</span>
- <a name="l00948"></a>00948 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
- <a name="l00949"></a>00949 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.chkerr);
- <a name="l00950"></a>00950 UIP_LOG(<span class="stringliteral">"ip: bad checksum."</span>);
- <a name="l00951"></a>00951 <span class="keywordflow">goto</span> drop;
- <a name="l00952"></a>00952 }
- <a name="l00953"></a>00953 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l00954"></a>00954
- <a name="l00955"></a>00955 <span class="keywordflow">if</span>(BUF->proto == UIP_PROTO_TCP) { <span class="comment">/* Check for TCP packet. If so,</span>
- <a name="l00956"></a>00956 <span class="comment"> proceed with TCP input</span>
- <a name="l00957"></a>00957 <span class="comment"> processing. */</span>
- <a name="l00958"></a>00958 <span class="keywordflow">goto</span> tcp_input;
- <a name="l00959"></a>00959 }
- <a name="l00960"></a>00960
- <a name="l00961"></a>00961 <span class="preprocessor">#if UIP_UDP</span>
- <a name="l00962"></a>00962 <span class="preprocessor"></span> <span class="keywordflow">if</span>(BUF->proto == UIP_PROTO_UDP) {
- <a name="l00963"></a>00963 <span class="keywordflow">goto</span> udp_input;
- <a name="l00964"></a>00964 }
- <a name="l00965"></a>00965 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
- <a name="l00966"></a>00966
- <a name="l00967"></a>00967 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
- <a name="l00968"></a>00968 <span class="preprocessor"></span> <span class="comment">/* ICMPv4 processing code follows. */</span>
- <a name="l00969"></a>00969 <span class="keywordflow">if</span>(BUF->proto != UIP_PROTO_ICMP) { <span class="comment">/* We only allow ICMP packets from</span>
- <a name="l00970"></a>00970 <span class="comment"> here. */</span>
- <a name="l00971"></a>00971 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
- <a name="l00972"></a>00972 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.protoerr);
- <a name="l00973"></a>00973 UIP_LOG(<span class="stringliteral">"ip: neither tcp nor icmp."</span>);
- <a name="l00974"></a>00974 <span class="keywordflow">goto</span> drop;
- <a name="l00975"></a>00975 }
- <a name="l00976"></a>00976
- <a name="l00977"></a>00977 <span class="preprocessor">#if UIP_PINGADDRCONF</span>
- <a name="l00978"></a>00978 <span class="preprocessor"></span> icmp_input:
- <a name="l00979"></a>00979 <span class="preprocessor">#endif </span><span class="comment">/* UIP_PINGADDRCONF */</span>
- <a name="l00980"></a>00980 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.recv);
- <a name="l00981"></a>00981
- <a name="l00982"></a>00982 <span class="comment">/* ICMP echo (i.e., ping) processing. This is simple, we only change</span>
- <a name="l00983"></a>00983 <span class="comment"> the ICMP type from ECHO to ECHO_REPLY and adjust the ICMP</span>
- <a name="l00984"></a>00984 <span class="comment"> checksum before we return the packet. */</span>
- <a name="l00985"></a>00985 <span class="keywordflow">if</span>(ICMPBUF->type != ICMP_ECHO) {
- <a name="l00986"></a>00986 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.drop);
- <a name="l00987"></a>00987 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.typeerr);
- <a name="l00988"></a>00988 UIP_LOG(<span class="stringliteral">"icmp: not icmp echo."</span>);
- <a name="l00989"></a>00989 <span class="keywordflow">goto</span> drop;
- <a name="l00990"></a>00990 }
- <a name="l00991"></a>00991
- <a name="l00992"></a>00992 <span class="comment">/* If we are configured to use ping IP address assignment, we use</span>
- <a name="l00993"></a>00993 <span class="comment"> the destination IP address of this ping packet and assign it to</span>
- <a name="l00994"></a>00994 <span class="comment"> ourself. */</span>
- <a name="l00995"></a>00995 <span class="preprocessor">#if UIP_PINGADDRCONF</span>
- <a name="l00996"></a>00996 <span class="preprocessor"></span> <span class="keywordflow">if</span>(<a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&uip_hostaddr, &uip_all_zeroes_addr)) {
- <a name="l00997"></a>00997 uip_hostaddr = BUF->destipaddr;
- <a name="l00998"></a>00998 }
- <a name="l00999"></a>00999 <span class="preprocessor">#endif </span><span class="comment">/* UIP_PINGADDRCONF */</span>
- <a name="l01000"></a>01000
- <a name="l01001"></a>01001 ICMPBUF->type = ICMP_ECHO_REPLY;
- <a name="l01002"></a>01002
- <a name="l01003"></a>01003 <span class="keywordflow">if</span>(ICMPBUF->icmpchksum >= <a class="code" href="a01576.html#ga703ee949a28cb00b5f8ee54bfe664e8d" title="Convert 16-bit quantity from host byte order to network byte order.">UIP_HTONS</a>(0xffff - (ICMP_ECHO << 8))) {
- <a name="l01004"></a>01004 ICMPBUF->icmpchksum += <a class="code" href="a01576.html#ga703ee949a28cb00b5f8ee54bfe664e8d" title="Convert 16-bit quantity from host byte order to network byte order.">UIP_HTONS</a>(ICMP_ECHO << 8) + 1;
- <a name="l01005"></a>01005 } <span class="keywordflow">else</span> {
- <a name="l01006"></a>01006 ICMPBUF->icmpchksum += <a class="code" href="a01576.html#ga703ee949a28cb00b5f8ee54bfe664e8d" title="Convert 16-bit quantity from host byte order to network byte order.">UIP_HTONS</a>(ICMP_ECHO << 8);
- <a name="l01007"></a>01007 }
- <a name="l01008"></a>01008
- <a name="l01009"></a>01009 <span class="comment">/* Swap IP addresses. */</span>
- <a name="l01010"></a>01010 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->destipaddr, &BUF->srcipaddr);
- <a name="l01011"></a>01011 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->srcipaddr, &uip_hostaddr);
- <a name="l01012"></a>01012
- <a name="l01013"></a>01013 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.sent);
- <a name="l01014"></a>01014 BUF->ttl = <a class="code" href="a01582.html#gab61381673de27f31848c5396bf0b338e" title="The IP TTL (time to live) of IP packets sent by uIP.">UIP_TTL</a>;
- <a name="l01015"></a>01015 <span class="keywordflow">goto</span> ip_send_nolen;
- <a name="l01016"></a>01016
- <a name="l01017"></a>01017 <span class="comment">/* End of IPv4 input header processing code. */</span>
- <a name="l01018"></a>01018 <span class="preprocessor">#else </span><span class="comment">/* !UIP_CONF_IPV6 */</span>
- <a name="l01019"></a>01019
- <a name="l01020"></a>01020 <span class="comment">/* This is IPv6 ICMPv6 processing code. */</span>
- <a name="l01021"></a>01021 DEBUG_PRINTF(<span class="stringliteral">"icmp6_input: length %d\n"</span>, <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>);
- <a name="l01022"></a>01022
- <a name="l01023"></a>01023 <span class="keywordflow">if</span>(BUF->proto != UIP_PROTO_ICMP6) { <span class="comment">/* We only allow ICMPv6 packets from</span>
- <a name="l01024"></a>01024 <span class="comment"> here. */</span>
- <a name="l01025"></a>01025 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
- <a name="l01026"></a>01026 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.protoerr);
- <a name="l01027"></a>01027 UIP_LOG(<span class="stringliteral">"ip: neither tcp nor icmp6."</span>);
- <a name="l01028"></a>01028 <span class="keywordflow">goto</span> drop;
- <a name="l01029"></a>01029 }
- <a name="l01030"></a>01030
- <a name="l01031"></a>01031 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.recv);
- <a name="l01032"></a>01032
- <a name="l01033"></a>01033 <span class="comment">/* If we get a neighbor solicitation for our address we should send</span>
- <a name="l01034"></a>01034 <span class="comment"> a neighbor advertisement message back. */</span>
- <a name="l01035"></a>01035 <span class="keywordflow">if</span>(ICMPBUF->type == ICMP6_NEIGHBOR_SOLICITATION) {
- <a name="l01036"></a>01036 <span class="keywordflow">if</span>(<a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&ICMPBUF->icmp6data, &uip_hostaddr)) {
- <a name="l01037"></a>01037
- <a name="l01038"></a>01038 <span class="keywordflow">if</span>(ICMPBUF->options[0] == ICMP6_OPTION_SOURCE_LINK_ADDRESS) {
- <a name="l01039"></a>01039 <span class="comment">/* Save the sender's address in our neighbor list. */</span>
- <a name="l01040"></a>01040 uip_neighbor_add(&ICMPBUF->srcipaddr, &(ICMPBUF->options[2]));
- <a name="l01041"></a>01041 }
- <a name="l01042"></a>01042
- <a name="l01043"></a>01043 <span class="comment">/* We should now send a neighbor advertisement back to where the</span>
- <a name="l01044"></a>01044 <span class="comment"> neighbor solicication came from. */</span>
- <a name="l01045"></a>01045 ICMPBUF->type = ICMP6_NEIGHBOR_ADVERTISEMENT;
- <a name="l01046"></a>01046 ICMPBUF->flags = ICMP6_FLAG_S; <span class="comment">/* Solicited flag. */</span>
- <a name="l01047"></a>01047
- <a name="l01048"></a>01048 ICMPBUF->reserved1 = ICMPBUF->reserved2 = ICMPBUF->reserved3 = 0;
- <a name="l01049"></a>01049
- <a name="l01050"></a>01050 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&ICMPBUF->destipaddr, &ICMPBUF->srcipaddr);
- <a name="l01051"></a>01051 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&ICMPBUF->srcipaddr, &uip_hostaddr);
- <a name="l01052"></a>01052 ICMPBUF->options[0] = ICMP6_OPTION_TARGET_LINK_ADDRESS;
- <a name="l01053"></a>01053 ICMPBUF->options[1] = 1; <span class="comment">/* Options length, 1 = 8 bytes. */</span>
- <a name="l01054"></a>01054 memcpy(&(ICMPBUF->options[2]), &uip_ethaddr, <span class="keyword">sizeof</span>(uip_ethaddr));
- <a name="l01055"></a>01055 ICMPBUF->icmpchksum = 0;
- <a name="l01056"></a>01056 ICMPBUF->icmpchksum = ~<a class="code" href="a01684.html#ga5e6741b8bd3e0961fb87e3f85da27a7f" title="Calculate the ICMP checksum of the packet in uip_buf.">uip_icmp6chksum</a>();
- <a name="l01057"></a>01057
- <a name="l01058"></a>01058 <span class="keywordflow">goto</span> send;
- <a name="l01059"></a>01059
- <a name="l01060"></a>01060 }
- <a name="l01061"></a>01061 <span class="keywordflow">goto</span> drop;
- <a name="l01062"></a>01062 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(ICMPBUF->type == ICMP6_ECHO) {
- <a name="l01063"></a>01063 <span class="comment">/* ICMP echo (i.e., ping) processing. This is simple, we only</span>
- <a name="l01064"></a>01064 <span class="comment"> change the ICMP type from ECHO to ECHO_REPLY and update the</span>
- <a name="l01065"></a>01065 <span class="comment"> ICMP checksum before we return the packet. */</span>
- <a name="l01066"></a>01066
- <a name="l01067"></a>01067 ICMPBUF->type = <a class="code" href="a01685.html#ga207d17b633cd095120a74bc1f2257b17" title="Echo reply.">ICMP6_ECHO_REPLY</a>;
- <a name="l01068"></a>01068
- <a name="l01069"></a>01069 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->destipaddr, &BUF->srcipaddr);
- <a name="l01070"></a>01070 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->srcipaddr, &uip_hostaddr);
- <a name="l01071"></a>01071 ICMPBUF->icmpchksum = 0;
- <a name="l01072"></a>01072 ICMPBUF->icmpchksum = ~<a class="code" href="a01684.html#ga5e6741b8bd3e0961fb87e3f85da27a7f" title="Calculate the ICMP checksum of the packet in uip_buf.">uip_icmp6chksum</a>();
- <a name="l01073"></a>01073
- <a name="l01074"></a>01074 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.sent);
- <a name="l01075"></a>01075 <span class="keywordflow">goto</span> send;
- <a name="l01076"></a>01076 } <span class="keywordflow">else</span> {
- <a name="l01077"></a>01077 DEBUG_PRINTF(<span class="stringliteral">"Unknown icmp6 message type %d\n"</span>, ICMPBUF->type);
- <a name="l01078"></a>01078 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.drop);
- <a name="l01079"></a>01079 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.typeerr);
- <a name="l01080"></a>01080 UIP_LOG(<span class="stringliteral">"icmp: unknown ICMP message."</span>);
- <a name="l01081"></a>01081 <span class="keywordflow">goto</span> drop;
- <a name="l01082"></a>01082 }
- <a name="l01083"></a>01083
- <a name="l01084"></a>01084 <span class="comment">/* End of IPv6 ICMP processing. */</span>
- <a name="l01085"></a>01085
- <a name="l01086"></a>01086 <span class="preprocessor">#endif </span><span class="comment">/* !UIP_CONF_IPV6 */</span>
- <a name="l01087"></a>01087
- <a name="l01088"></a>01088 <span class="preprocessor">#if UIP_UDP</span>
- <a name="l01089"></a>01089 <span class="preprocessor"></span> <span class="comment">/* UDP input processing. */</span>
- <a name="l01090"></a>01090 udp_input:
- <a name="l01091"></a>01091 <span class="comment">/* UDP processing is really just a hack. We don't do anything to the</span>
- <a name="l01092"></a>01092 <span class="comment"> UDP/IP headers, but let the UDP application do all the hard</span>
- <a name="l01093"></a>01093 <span class="comment"> work. If the application sets uip_slen, it has a packet to</span>
- <a name="l01094"></a>01094 <span class="comment"> send. */</span>
- <a name="l01095"></a>01095 <span class="preprocessor">#if UIP_UDP_CHECKSUMS</span>
- <a name="l01096"></a>01096 <span class="preprocessor"></span> <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> - UIP_IPUDPH_LEN;
- <a name="l01097"></a>01097 <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = &uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + UIP_IPUDPH_LEN];
- <a name="l01098"></a>01098 <span class="keywordflow">if</span>(UDPBUF->udpchksum != 0 && <a class="code" href="a01684.html#ga7023a34ba9e9d03b5fbedbcb32924453" title="Calculate the UDP checksum of the packet in uip_buf and uip_appdata.">uip_udpchksum</a>() != 0xffff) {
- <a name="l01099"></a>01099 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.udp.drop);
- <a name="l01100"></a>01100 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.udp.chkerr);
- <a name="l01101"></a>01101 UIP_LOG(<span class="stringliteral">"udp: bad checksum."</span>);
- <a name="l01102"></a>01102 <span class="keywordflow">goto</span> drop;
- <a name="l01103"></a>01103 }
- <a name="l01104"></a>01104 <span class="preprocessor">#else </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
- <a name="l01105"></a>01105 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> - UIP_IPUDPH_LEN;
- <a name="l01106"></a>01106 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
- <a name="l01107"></a>01107
- <a name="l01108"></a>01108 <span class="comment">/* Make sure that the UDP destination port number is not zero. */</span>
- <a name="l01109"></a>01109 <span class="keywordflow">if</span>(UDPBUF->destport == 0) {
- <a name="l01110"></a>01110 UIP_LOG(<span class="stringliteral">"udp: zero port."</span>);
- <a name="l01111"></a>01111 <span class="keywordflow">goto</span> drop;
- <a name="l01112"></a>01112 }
- <a name="l01113"></a>01113
- <a name="l01114"></a>01114 <span class="comment">/* Demultiplex this UDP packet between the UDP "connections". */</span>
- <a name="l01115"></a>01115 <span class="keywordflow">for</span>(uip_udp_conn = &uip_udp_conns[0];
- <a name="l01116"></a>01116 uip_udp_conn < &uip_udp_conns[<a class="code" href="a01584.html#ga196379ceb1219a99f4495e41ccc9bbfb" title="The maximum amount of concurrent UDP connections.">UIP_UDP_CONNS</a>];
- <a name="l01117"></a>01117 ++uip_udp_conn) {
- <a name="l01118"></a>01118 <span class="comment">/* If the local UDP port is non-zero, the connection is considered</span>
- <a name="l01119"></a>01119 <span class="comment"> to be used. If so, the local port number is checked against the</span>
- <a name="l01120"></a>01120 <span class="comment"> destination port number in the received packet. If the two port</span>
- <a name="l01121"></a>01121 <span class="comment"> numbers match, the remote port number is checked if the</span>
- <a name="l01122"></a>01122 <span class="comment"> connection is bound to a remote port. Finally, if the</span>
- <a name="l01123"></a>01123 <span class="comment"> connection is bound to a remote IP address, the source IP</span>
- <a name="l01124"></a>01124 <span class="comment"> address of the packet is checked. */</span>
- <a name="l01125"></a>01125 <span class="keywordflow">if</span>(uip_udp_conn-><a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> != 0 &&
- <a name="l01126"></a>01126 UDPBUF->destport == uip_udp_conn-><a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> &&
- <a name="l01127"></a>01127 (uip_udp_conn-><a class="code" href="a00119.html#a280a0c2a93544e597f92bbacf36ee1dc" title="The remote port number in network byte order.">rport</a> == 0 ||
- <a name="l01128"></a>01128 UDPBUF->srcport == uip_udp_conn-><a class="code" href="a00119.html#a280a0c2a93544e597f92bbacf36ee1dc" title="The remote port number in network byte order.">rport</a>) &&
- <a name="l01129"></a>01129 (<a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&uip_udp_conn-><a class="code" href="a00119.html#a8a661a2d544100b82d0d14a1985083d5" title="The IP address of the remote peer.">ripaddr</a>, &uip_all_zeroes_addr) ||
- <a name="l01130"></a>01130 <a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&uip_udp_conn-><a class="code" href="a00119.html#a8a661a2d544100b82d0d14a1985083d5" title="The IP address of the remote peer.">ripaddr</a>, &uip_broadcast_addr) ||
- <a name="l01131"></a>01131 <a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&BUF->srcipaddr, &uip_udp_conn-><a class="code" href="a00119.html#a8a661a2d544100b82d0d14a1985083d5" title="The IP address of the remote peer.">ripaddr</a>))) {
- <a name="l01132"></a>01132 <span class="keywordflow">goto</span> udp_found;
- <a name="l01133"></a>01133 }
- <a name="l01134"></a>01134 }
- <a name="l01135"></a>01135 UIP_LOG(<span class="stringliteral">"udp: no matching connection found"</span>);
- <a name="l01136"></a>01136 <span class="preprocessor">#if UIP_CONF_ICMP_DEST_UNREACH && !UIP_CONF_IPV6</span>
- <a name="l01137"></a>01137 <span class="preprocessor"></span> <span class="comment">/* Copy fields from packet header into payload of this ICMP packet. */</span>
- <a name="l01138"></a>01138 memcpy(&(ICMPBUF->payload[0]), ICMPBUF, UIP_IPH_LEN + 8);
- <a name="l01139"></a>01139
- <a name="l01140"></a>01140 <span class="comment">/* Set the ICMP type and code. */</span>
- <a name="l01141"></a>01141 ICMPBUF->type = ICMP_DEST_UNREACHABLE;
- <a name="l01142"></a>01142 ICMPBUF->icode = ICMP_PORT_UNREACHABLE;
- <a name="l01143"></a>01143
- <a name="l01144"></a>01144 <span class="comment">/* Calculate the ICMP checksum. */</span>
- <a name="l01145"></a>01145 ICMPBUF->icmpchksum = 0;
- <a name="l01146"></a>01146 ICMPBUF->icmpchksum = ~<a class="code" href="a01684.html#gab6683dd83fe1c8de9a24086d4b69e907" title="Calculate the Internet checksum over a buffer.">uip_chksum</a>((<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> *)&(ICMPBUF->type), 36);
- <a name="l01147"></a>01147
- <a name="l01148"></a>01148 <span class="comment">/* Set the IP destination address to be the source address of the</span>
- <a name="l01149"></a>01149 <span class="comment"> original packet. */</span>
- <a name="l01150"></a>01150 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->destipaddr, &BUF->srcipaddr);
- <a name="l01151"></a>01151
- <a name="l01152"></a>01152 <span class="comment">/* Set our IP address as the source address. */</span>
- <a name="l01153"></a>01153 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->srcipaddr, &uip_hostaddr);
- <a name="l01154"></a>01154
- <a name="l01155"></a>01155 <span class="comment">/* The size of the ICMP destination unreachable packet is 36 + the</span>
- <a name="l01156"></a>01156 <span class="comment"> size of the IP header (20) = 56. */</span>
- <a name="l01157"></a>01157 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 36 + UIP_IPH_LEN;
- <a name="l01158"></a>01158 ICMPBUF->len[0] = 0;
- <a name="l01159"></a>01159 ICMPBUF->len[1] = (<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a>)<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>;
- <a name="l01160"></a>01160 ICMPBUF->ttl = <a class="code" href="a01582.html#gab61381673de27f31848c5396bf0b338e" title="The IP TTL (time to live) of IP packets sent by uIP.">UIP_TTL</a>;
- <a name="l01161"></a>01161 ICMPBUF->proto = UIP_PROTO_ICMP;
- <a name="l01162"></a>01162
- <a name="l01163"></a>01163 <span class="keywordflow">goto</span> ip_send_nolen;
- <a name="l01164"></a>01164 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_ICMP_DEST_UNREACH */</span>
- <a name="l01165"></a>01165 <span class="keywordflow">goto</span> drop;
- <a name="l01166"></a>01166 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_ICMP_DEST_UNREACH */</span>
- <a name="l01167"></a>01167
- <a name="l01168"></a>01168 udp_found:
- <a name="l01169"></a>01169 uip_conn = NULL;
- <a name="l01170"></a>01170 uip_flags = UIP_NEWDATA;
- <a name="l01171"></a>01171 uip_sappdata = <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = &uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + UIP_IPUDPH_LEN];
- <a name="l01172"></a>01172 uip_slen = 0;
- <a name="l01173"></a>01173 UIP_UDP_APPCALL();
- <a name="l01174"></a>01174
- <a name="l01175"></a>01175 udp_send:
- <a name="l01176"></a>01176 <span class="keywordflow">if</span>(uip_slen == 0) {
- <a name="l01177"></a>01177 <span class="keywordflow">goto</span> drop;
- <a name="l01178"></a>01178 }
- <a name="l01179"></a>01179 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = uip_slen + UIP_IPUDPH_LEN;
- <a name="l01180"></a>01180
- <a name="l01181"></a>01181 <span class="preprocessor">#if UIP_CONF_IPV6</span>
- <a name="l01182"></a>01182 <span class="preprocessor"></span> <span class="comment">/* For IPv6, the IP length field does not include the IPv6 IP header</span>
- <a name="l01183"></a>01183 <span class="comment"> length. */</span>
- <a name="l01184"></a>01184 BUF->len[0] = ((<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> - UIP_IPH_LEN) >> 8);
- <a name="l01185"></a>01185 BUF->len[1] = ((<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> - UIP_IPH_LEN) & 0xff);
- <a name="l01186"></a>01186 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l01187"></a>01187 BUF->len[0] = (<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> >> 8);
- <a name="l01188"></a>01188 BUF->len[1] = (<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> & 0xff);
- <a name="l01189"></a>01189 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l01190"></a>01190
- <a name="l01191"></a>01191 BUF->ttl = uip_udp_conn-><a class="code" href="a00119.html#a4da1d7815516cd2b5bda3a66fdf05198" title="Default time-to-live.">ttl</a>;
- <a name="l01192"></a>01192 BUF->proto = UIP_PROTO_UDP;
- <a name="l01193"></a>01193
- <a name="l01194"></a>01194 UDPBUF->udplen = <a class="code" href="a01576.html#ga703ee949a28cb00b5f8ee54bfe664e8d" title="Convert 16-bit quantity from host byte order to network byte order.">UIP_HTONS</a>(uip_slen + UIP_UDPH_LEN);
- <a name="l01195"></a>01195 UDPBUF->udpchksum = 0;
- <a name="l01196"></a>01196
- <a name="l01197"></a>01197 BUF->srcport = uip_udp_conn-><a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a>;
- <a name="l01198"></a>01198 BUF->destport = uip_udp_conn-><a class="code" href="a00119.html#a280a0c2a93544e597f92bbacf36ee1dc" title="The remote port number in network byte order.">rport</a>;
- <a name="l01199"></a>01199
- <a name="l01200"></a>01200 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->srcipaddr, &uip_hostaddr);
- <a name="l01201"></a>01201 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->destipaddr, &uip_udp_conn-><a class="code" href="a00119.html#a8a661a2d544100b82d0d14a1985083d5" title="The IP address of the remote peer.">ripaddr</a>);
- <a name="l01202"></a>01202
- <a name="l01203"></a>01203 <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = &uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + UIP_IPTCPH_LEN];
- <a name="l01204"></a>01204
- <a name="l01205"></a>01205 <span class="preprocessor">#if UIP_UDP_CHECKSUMS</span>
- <a name="l01206"></a>01206 <span class="preprocessor"></span> <span class="comment">/* Calculate UDP checksum. */</span>
- <a name="l01207"></a>01207 UDPBUF->udpchksum = ~(<a class="code" href="a01684.html#ga7023a34ba9e9d03b5fbedbcb32924453" title="Calculate the UDP checksum of the packet in uip_buf and uip_appdata.">uip_udpchksum</a>());
- <a name="l01208"></a>01208 <span class="keywordflow">if</span>(UDPBUF->udpchksum == 0) {
- <a name="l01209"></a>01209 UDPBUF->udpchksum = 0xffff;
- <a name="l01210"></a>01210 }
- <a name="l01211"></a>01211 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
- <a name="l01212"></a>01212
- <a name="l01213"></a>01213 <span class="keywordflow">goto</span> ip_send_nolen;
- <a name="l01214"></a>01214 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
- <a name="l01215"></a>01215
- <a name="l01216"></a>01216 <span class="comment">/* TCP input processing. */</span>
- <a name="l01217"></a>01217 tcp_input:
- <a name="l01218"></a>01218 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.recv);
- <a name="l01219"></a>01219
- <a name="l01220"></a>01220 <span class="comment">/* Start of TCP input header processing code. */</span>
- <a name="l01221"></a>01221
- <a name="l01222"></a>01222 <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga85b65e38aa74eba18979156f97a94a87" title="Calculate the TCP checksum of the packet in uip_buf and uip_appdata.">uip_tcpchksum</a>() != 0xffff) { <span class="comment">/* Compute and check the TCP</span>
- <a name="l01223"></a>01223 <span class="comment"> checksum. */</span>
- <a name="l01224"></a>01224 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.drop);
- <a name="l01225"></a>01225 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.chkerr);
- <a name="l01226"></a>01226 UIP_LOG(<span class="stringliteral">"tcp: bad checksum."</span>);
- <a name="l01227"></a>01227 <span class="keywordflow">goto</span> drop;
- <a name="l01228"></a>01228 }
- <a name="l01229"></a>01229
- <a name="l01230"></a>01230 <span class="comment">/* Make sure that the TCP port number is not zero. */</span>
- <a name="l01231"></a>01231 <span class="keywordflow">if</span>(BUF->destport == 0 || BUF->srcport == 0) {
- <a name="l01232"></a>01232 UIP_LOG(<span class="stringliteral">"tcp: zero port."</span>);
- <a name="l01233"></a>01233 <span class="keywordflow">goto</span> drop;
- <a name="l01234"></a>01234 }
- <a name="l01235"></a>01235
- <a name="l01236"></a>01236 <span class="comment">/* Demultiplex this segment. */</span>
- <a name="l01237"></a>01237 <span class="comment">/* First check any active connections. */</span>
- <a name="l01238"></a>01238 <span class="keywordflow">for</span>(uip_connr = &uip_conns[0]; uip_connr <= &uip_conns[UIP_CONNS - 1];
- <a name="l01239"></a>01239 ++uip_connr) {
- <a name="l01240"></a>01240 <span class="keywordflow">if</span>(uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> != UIP_CLOSED &&
- <a name="l01241"></a>01241 BUF->destport == uip_connr-><a class="code" href="a00092.html#a0cd09beee671e7e9efb0b4aced10249e" title="The local TCP port, in network byte order.">lport</a> &&
- <a name="l01242"></a>01242 BUF->srcport == uip_connr-><a class="code" href="a00092.html#a1df6aa054ef2fa634ac4c6f418228285" title="The local remote TCP port, in network byte order.">rport</a> &&
- <a name="l01243"></a>01243 <a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&BUF->srcipaddr, &uip_connr-><a class="code" href="a00092.html#a79510aa86d3fa0a0fc6cfc49b1da7279" title="The IP address of the remote host.">ripaddr</a>)) {
- <a name="l01244"></a>01244 <span class="keywordflow">goto</span> found;
- <a name="l01245"></a>01245 }
- <a name="l01246"></a>01246 }
- <a name="l01247"></a>01247
- <a name="l01248"></a>01248 <span class="comment">/* If we didn't find and active connection that expected the packet,</span>
- <a name="l01249"></a>01249 <span class="comment"> either this packet is an old duplicate, or this is a SYN packet</span>
- <a name="l01250"></a>01250 <span class="comment"> destined for a connection in LISTEN. If the SYN flag isn't set,</span>
- <a name="l01251"></a>01251 <span class="comment"> it is an old packet and we send a RST. */</span>
- <a name="l01252"></a>01252 <span class="keywordflow">if</span>((BUF->flags & TCP_CTL) != TCP_SYN) {
- <a name="l01253"></a>01253 <span class="keywordflow">goto</span> reset;
- <a name="l01254"></a>01254 }
- <a name="l01255"></a>01255
- <a name="l01256"></a>01256 tmp16 = BUF->destport;
- <a name="l01257"></a>01257 <span class="comment">/* Next, check listening connections. */</span>
- <a name="l01258"></a>01258 <span class="keywordflow">for</span>(c = 0; c < <a class="code" href="a01585.html#ga8f4ebd8ef6c0ea665ed351d87fec09fd" title="The maximum number of simultaneously listening TCP ports.">UIP_LISTENPORTS</a>; ++c) {
- <a name="l01259"></a>01259 <span class="keywordflow">if</span>(tmp16 == uip_listenports[c]) {
- <a name="l01260"></a>01260 <span class="keywordflow">goto</span> found_listen;
- <a name="l01261"></a>01261 }
- <a name="l01262"></a>01262 }
- <a name="l01263"></a>01263
- <a name="l01264"></a>01264 <span class="comment">/* No matching connection found, so we send a RST packet. */</span>
- <a name="l01265"></a>01265 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.synrst);
- <a name="l01266"></a>01266
- <a name="l01267"></a>01267 reset:
- <a name="l01268"></a>01268 <span class="comment">/* We do not send resets in response to resets. */</span>
- <a name="l01269"></a>01269 <span class="keywordflow">if</span>(BUF->flags & TCP_RST) {
- <a name="l01270"></a>01270 <span class="keywordflow">goto</span> drop;
- <a name="l01271"></a>01271 }
- <a name="l01272"></a>01272
- <a name="l01273"></a>01273 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.rst);
- <a name="l01274"></a>01274
- <a name="l01275"></a>01275 BUF->flags = TCP_RST | TCP_ACK;
- <a name="l01276"></a>01276 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = UIP_IPTCPH_LEN;
- <a name="l01277"></a>01277 BUF->tcpoffset = 5 << 4;
- <a name="l01278"></a>01278
- <a name="l01279"></a>01279 <span class="comment">/* Flip the seqno and ackno fields in the TCP header. */</span>
- <a name="l01280"></a>01280 c = BUF->seqno[3];
- <a name="l01281"></a>01281 BUF->seqno[3] = BUF->ackno[3];
- <a name="l01282"></a>01282 BUF->ackno[3] = c;
- <a name="l01283"></a>01283
- <a name="l01284"></a>01284 c = BUF->seqno[2];
- <a name="l01285"></a>01285 BUF->seqno[2] = BUF->ackno[2];
- <a name="l01286"></a>01286 BUF->ackno[2] = c;
- <a name="l01287"></a>01287
- <a name="l01288"></a>01288 c = BUF->seqno[1];
- <a name="l01289"></a>01289 BUF->seqno[1] = BUF->ackno[1];
- <a name="l01290"></a>01290 BUF->ackno[1] = c;
- <a name="l01291"></a>01291
- <a name="l01292"></a>01292 c = BUF->seqno[0];
- <a name="l01293"></a>01293 BUF->seqno[0] = BUF->ackno[0];
- <a name="l01294"></a>01294 BUF->ackno[0] = c;
- <a name="l01295"></a>01295
- <a name="l01296"></a>01296 <span class="comment">/* We also have to increase the sequence number we are</span>
- <a name="l01297"></a>01297 <span class="comment"> acknowledging. If the least significant byte overflowed, we need</span>
- <a name="l01298"></a>01298 <span class="comment"> to propagate the carry to the other bytes as well. */</span>
- <a name="l01299"></a>01299 <span class="keywordflow">if</span>(++BUF->ackno[3] == 0) {
- <a name="l01300"></a>01300 <span class="keywordflow">if</span>(++BUF->ackno[2] == 0) {
- <a name="l01301"></a>01301 <span class="keywordflow">if</span>(++BUF->ackno[1] == 0) {
- <a name="l01302"></a>01302 ++BUF->ackno[0];
- <a name="l01303"></a>01303 }
- <a name="l01304"></a>01304 }
- <a name="l01305"></a>01305 }
- <a name="l01306"></a>01306
- <a name="l01307"></a>01307 <span class="comment">/* Swap port numbers. */</span>
- <a name="l01308"></a>01308 tmp16 = BUF->srcport;
- <a name="l01309"></a>01309 BUF->srcport = BUF->destport;
- <a name="l01310"></a>01310 BUF->destport = tmp16;
- <a name="l01311"></a>01311
- <a name="l01312"></a>01312 <span class="comment">/* Swap IP addresses. */</span>
- <a name="l01313"></a>01313 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->destipaddr, &BUF->srcipaddr);
- <a name="l01314"></a>01314 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->srcipaddr, &uip_hostaddr);
- <a name="l01315"></a>01315
- <a name="l01316"></a>01316 <span class="comment">/* And send out the RST packet! */</span>
- <a name="l01317"></a>01317 <span class="keywordflow">goto</span> tcp_send_noconn;
- <a name="l01318"></a>01318
- <a name="l01319"></a>01319 <span class="comment">/* This label will be jumped to if we matched the incoming packet</span>
- <a name="l01320"></a>01320 <span class="comment"> with a connection in LISTEN. In that case, we should create a new</span>
- <a name="l01321"></a>01321 <span class="comment"> connection and send a SYNACK in return. */</span>
- <a name="l01322"></a>01322 found_listen:
- <a name="l01323"></a>01323 <span class="comment">/* First we check if there are any connections avaliable. Unused</span>
- <a name="l01324"></a>01324 <span class="comment"> connections are kept in the same table as used connections, but</span>
- <a name="l01325"></a>01325 <span class="comment"> unused ones have the tcpstate set to CLOSED. Also, connections in</span>
- <a name="l01326"></a>01326 <span class="comment"> TIME_WAIT are kept track of and we'll use the oldest one if no</span>
- <a name="l01327"></a>01327 <span class="comment"> CLOSED connections are found. Thanks to Eddie C. Dost for a very</span>
- <a name="l01328"></a>01328 <span class="comment"> nice algorithm for the TIME_WAIT search. */</span>
- <a name="l01329"></a>01329 uip_connr = 0;
- <a name="l01330"></a>01330 <span class="keywordflow">for</span>(c = 0; c < UIP_CONNS; ++c) {
- <a name="l01331"></a>01331 <span class="keywordflow">if</span>(uip_conns[c].<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_CLOSED) {
- <a name="l01332"></a>01332 uip_connr = &uip_conns[c];
- <a name="l01333"></a>01333 <span class="keywordflow">break</span>;
- <a name="l01334"></a>01334 }
- <a name="l01335"></a>01335 <span class="keywordflow">if</span>(uip_conns[c].<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_TIME_WAIT) {
- <a name="l01336"></a>01336 <span class="keywordflow">if</span>(uip_connr == 0 ||
- <a name="l01337"></a>01337 uip_conns[c].<a class="code" href="a00086.html" title="A timer.">timer</a> > uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a>) {
- <a name="l01338"></a>01338 uip_connr = &uip_conns[c];
- <a name="l01339"></a>01339 }
- <a name="l01340"></a>01340 }
- <a name="l01341"></a>01341 }
- <a name="l01342"></a>01342
- <a name="l01343"></a>01343 <span class="keywordflow">if</span>(uip_connr == 0) {
- <a name="l01344"></a>01344 <span class="comment">/* All connections are used already, we drop packet and hope that</span>
- <a name="l01345"></a>01345 <span class="comment"> the remote end will retransmit the packet at a time when we</span>
- <a name="l01346"></a>01346 <span class="comment"> have more spare connections. */</span>
- <a name="l01347"></a>01347 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.syndrop);
- <a name="l01348"></a>01348 UIP_LOG(<span class="stringliteral">"tcp: found no unused connections."</span>);
- <a name="l01349"></a>01349 <span class="keywordflow">goto</span> drop;
- <a name="l01350"></a>01350 }
- <a name="l01351"></a>01351 uip_conn = uip_connr;
- <a name="l01352"></a>01352
- <a name="l01353"></a>01353 <span class="comment">/* Fill in the necessary fields for the new connection. */</span>
- <a name="l01354"></a>01354 uip_connr-><a class="code" href="a00092.html#ae3aa9cc25e45b663e6aabc54c013019e" title="Retransmission time-out.">rto</a> = uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = <a class="code" href="a01585.html#ga15de27b044603284f68db05a378235a7" title="The initial retransmission timeout counted in timer pulses.">UIP_RTO</a>;
- <a name="l01355"></a>01355 uip_connr-><a class="code" href="a00092.html#aef661afb3aa82f0437d2ed8d3c20be76" title="Retransmission time-out calculation state variable.">sa</a> = 0;
- <a name="l01356"></a>01356 uip_connr-><a class="code" href="a00092.html#aeb9fcbd3c9b0a795dcd63f33c323d65c" title="Retransmission time-out calculation state variable.">sv</a> = 4;
- <a name="l01357"></a>01357 uip_connr-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> = 0;
- <a name="l01358"></a>01358 uip_connr-><a class="code" href="a00092.html#a0cd09beee671e7e9efb0b4aced10249e" title="The local TCP port, in network byte order.">lport</a> = BUF->destport;
- <a name="l01359"></a>01359 uip_connr-><a class="code" href="a00092.html#a1df6aa054ef2fa634ac4c6f418228285" title="The local remote TCP port, in network byte order.">rport</a> = BUF->srcport;
- <a name="l01360"></a>01360 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&uip_connr-><a class="code" href="a00092.html#a79510aa86d3fa0a0fc6cfc49b1da7279" title="The IP address of the remote host.">ripaddr</a>, &BUF->srcipaddr);
- <a name="l01361"></a>01361 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_SYN_RCVD;
- <a name="l01362"></a>01362
- <a name="l01363"></a>01363 uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[0] = iss[0];
- <a name="l01364"></a>01364 uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[1] = iss[1];
- <a name="l01365"></a>01365 uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[2] = iss[2];
- <a name="l01366"></a>01366 uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[3] = iss[3];
- <a name="l01367"></a>01367 uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 1;
- <a name="l01368"></a>01368
- <a name="l01369"></a>01369 <span class="comment">/* rcv_nxt should be the seqno from the incoming packet + 1. */</span>
- <a name="l01370"></a>01370 uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[3] = BUF->seqno[3];
- <a name="l01371"></a>01371 uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[2] = BUF->seqno[2];
- <a name="l01372"></a>01372 uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[1] = BUF->seqno[1];
- <a name="l01373"></a>01373 uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[0] = BUF->seqno[0];
- <a name="l01374"></a>01374 uip_add_rcv_nxt(1);
- <a name="l01375"></a>01375
- <a name="l01376"></a>01376 <span class="comment">/* Parse the TCP MSS option, if present. */</span>
- <a name="l01377"></a>01377 <span class="keywordflow">if</span>((BUF->tcpoffset & 0xf0) > 0x50) {
- <a name="l01378"></a>01378 <span class="keywordflow">for</span>(c = 0; c < ((BUF->tcpoffset >> 4) - 5) << 2 ;) {
- <a name="l01379"></a>01379 opt = uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + c];
- <a name="l01380"></a>01380 <span class="keywordflow">if</span>(opt == TCP_OPT_END) {
- <a name="l01381"></a>01381 <span class="comment">/* End of options. */</span>
- <a name="l01382"></a>01382 <span class="keywordflow">break</span>;
- <a name="l01383"></a>01383 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == TCP_OPT_NOOP) {
- <a name="l01384"></a>01384 ++c;
- <a name="l01385"></a>01385 <span class="comment">/* NOP option. */</span>
- <a name="l01386"></a>01386 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == TCP_OPT_MSS &&
- <a name="l01387"></a>01387 uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 1 + c] == TCP_OPT_MSS_LEN) {
- <a name="l01388"></a>01388 <span class="comment">/* An MSS option with the right option length. */</span>
- <a name="l01389"></a>01389 tmp16 = ((<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>)uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 2 + c] << 8) |
- <a name="l01390"></a>01390 (<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>)uip_buf[UIP_IPTCPH_LEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 3 + c];
- <a name="l01391"></a>01391 uip_connr-><a class="code" href="a00092.html#adb7a3fadb68df5fdd37e8b91a2c751ea" title="Initial maximum segment size for the connection.">initialmss</a> = uip_connr-><a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a> =
- <a name="l01392"></a>01392 tmp16 > <a class="code" href="a01585.html#ga4910467b83a639f06739c82cd362037e" title="The TCP maximum segment size.">UIP_TCP_MSS</a>? <a class="code" href="a01585.html#ga4910467b83a639f06739c82cd362037e" title="The TCP maximum segment size.">UIP_TCP_MSS</a>: tmp16;
- <a name="l01393"></a>01393
- <a name="l01394"></a>01394 <span class="comment">/* And we are done processing options. */</span>
- <a name="l01395"></a>01395 <span class="keywordflow">break</span>;
- <a name="l01396"></a>01396 } <span class="keywordflow">else</span> {
- <a name="l01397"></a>01397 <span class="comment">/* All other options have a length field, so that we easily</span>
- <a name="l01398"></a>01398 <span class="comment"> can skip past them. */</span>
- <a name="l01399"></a>01399 <span class="keywordflow">if</span>(uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 1 + c] == 0) {
- <a name="l01400"></a>01400 <span class="comment">/* If the length field is zero, the options are malformed</span>
- <a name="l01401"></a>01401 <span class="comment"> and we don't process them further. */</span>
- <a name="l01402"></a>01402 <span class="keywordflow">break</span>;
- <a name="l01403"></a>01403 }
- <a name="l01404"></a>01404 c += uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 1 + c];
- <a name="l01405"></a>01405 }
- <a name="l01406"></a>01406 }
- <a name="l01407"></a>01407 }
- <a name="l01408"></a>01408
- <a name="l01409"></a>01409 <span class="comment">/* Our response will be a SYNACK. */</span>
- <a name="l01410"></a>01410 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
- <a name="l01411"></a>01411 <span class="preprocessor"></span> tcp_send_synack:
- <a name="l01412"></a>01412 BUF->flags = TCP_ACK;
- <a name="l01413"></a>01413
- <a name="l01414"></a>01414 tcp_send_syn:
- <a name="l01415"></a>01415 BUF->flags |= TCP_SYN;
- <a name="l01416"></a>01416 <span class="preprocessor">#else </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
- <a name="l01417"></a>01417 tcp_send_synack:
- <a name="l01418"></a>01418 BUF->flags = TCP_SYN | TCP_ACK;
- <a name="l01419"></a>01419 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
- <a name="l01420"></a>01420
- <a name="l01421"></a>01421 <span class="comment">/* We send out the TCP Maximum Segment Size option with our</span>
- <a name="l01422"></a>01422 <span class="comment"> SYNACK. */</span>
- <a name="l01423"></a>01423 BUF->optdata[0] = TCP_OPT_MSS;
- <a name="l01424"></a>01424 BUF->optdata[1] = TCP_OPT_MSS_LEN;
- <a name="l01425"></a>01425 BUF->optdata[2] = (<a class="code" href="a01585.html#ga4910467b83a639f06739c82cd362037e" title="The TCP maximum segment size.">UIP_TCP_MSS</a>) / 256;
- <a name="l01426"></a>01426 BUF->optdata[3] = (<a class="code" href="a01585.html#ga4910467b83a639f06739c82cd362037e" title="The TCP maximum segment size.">UIP_TCP_MSS</a>) & 255;
- <a name="l01427"></a>01427 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = UIP_IPTCPH_LEN + TCP_OPT_MSS_LEN;
- <a name="l01428"></a>01428 BUF->tcpoffset = ((UIP_TCPH_LEN + TCP_OPT_MSS_LEN) / 4) << 4;
- <a name="l01429"></a>01429 <span class="keywordflow">goto</span> tcp_send;
- <a name="l01430"></a>01430
- <a name="l01431"></a>01431 <span class="comment">/* This label will be jumped to if we found an active connection. */</span>
- <a name="l01432"></a>01432 found:
- <a name="l01433"></a>01433 uip_conn = uip_connr;
- <a name="l01434"></a>01434 uip_flags = 0;
- <a name="l01435"></a>01435 <span class="comment">/* We do a very naive form of TCP reset processing; we just accept</span>
- <a name="l01436"></a>01436 <span class="comment"> any RST and kill our connection. We should in fact check if the</span>
- <a name="l01437"></a>01437 <span class="comment"> sequence number of this reset is wihtin our advertised window</span>
- <a name="l01438"></a>01438 <span class="comment"> before we accept the reset. */</span>
- <a name="l01439"></a>01439 <span class="keywordflow">if</span>(BUF->flags & TCP_RST) {
- <a name="l01440"></a>01440 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
- <a name="l01441"></a>01441 UIP_LOG(<span class="stringliteral">"tcp: got reset, aborting connection."</span>);
- <a name="l01442"></a>01442 uip_flags = UIP_ABORT;
- <a name="l01443"></a>01443 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l01444"></a>01444 <span class="keywordflow">goto</span> drop;
- <a name="l01445"></a>01445 }
- <a name="l01446"></a>01446 <span class="comment">/* Calculate the length of the data, if the application has sent</span>
- <a name="l01447"></a>01447 <span class="comment"> any data to us. */</span>
- <a name="l01448"></a>01448 c = (BUF->tcpoffset >> 4) << 2;
- <a name="l01449"></a>01449 <span class="comment">/* uip_len will contain the length of the actual TCP data. This is</span>
- <a name="l01450"></a>01450 <span class="comment"> calculated by subtracing the length of the TCP header (in</span>
- <a name="l01451"></a>01451 <span class="comment"> c) and the length of the IP header (20 bytes). */</span>
- <a name="l01452"></a>01452 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> - c - UIP_IPH_LEN;
- <a name="l01453"></a>01453
- <a name="l01454"></a>01454 <span class="comment">/* First, check if the sequence number of the incoming packet is</span>
- <a name="l01455"></a>01455 <span class="comment"> what we're expecting next. If not, we send out an ACK with the</span>
- <a name="l01456"></a>01456 <span class="comment"> correct numbers in, unless we are in the SYN_RCVD state and</span>
- <a name="l01457"></a>01457 <span class="comment"> receive a SYN, in which case we should retransmit our SYNACK</span>
- <a name="l01458"></a>01458 <span class="comment"> (which is done futher down). */</span>
- <a name="l01459"></a>01459 <span class="keywordflow">if</span>(!((((uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> & UIP_TS_MASK) == UIP_SYN_SENT) &&
- <a name="l01460"></a>01460 ((BUF->flags & TCP_CTL) == (TCP_SYN | TCP_ACK))) ||
- <a name="l01461"></a>01461 (((uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> & UIP_TS_MASK) == UIP_SYN_RCVD) &&
- <a name="l01462"></a>01462 ((BUF->flags & TCP_CTL) == TCP_SYN)))) {
- <a name="l01463"></a>01463 <span class="keywordflow">if</span>((<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> > 0 || ((BUF->flags & (TCP_SYN | TCP_FIN)) != 0)) &&
- <a name="l01464"></a>01464 (BUF->seqno[0] != uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[0] ||
- <a name="l01465"></a>01465 BUF->seqno[1] != uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[1] ||
- <a name="l01466"></a>01466 BUF->seqno[2] != uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[2] ||
- <a name="l01467"></a>01467 BUF->seqno[3] != uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[3])) {
- <a name="l01468"></a>01468 <span class="keywordflow">goto</span> tcp_send_ack;
- <a name="l01469"></a>01469 }
- <a name="l01470"></a>01470 }
- <a name="l01471"></a>01471
- <a name="l01472"></a>01472 <span class="comment">/* Next, check if the incoming segment acknowledges any outstanding</span>
- <a name="l01473"></a>01473 <span class="comment"> data. If so, we update the sequence number, reset the length of</span>
- <a name="l01474"></a>01474 <span class="comment"> the outstanding data, calculate RTT estimations, and reset the</span>
- <a name="l01475"></a>01475 <span class="comment"> retransmission timer. */</span>
- <a name="l01476"></a>01476 <span class="keywordflow">if</span>((BUF->flags & TCP_ACK) && uip_outstanding(uip_connr)) {
- <a name="l01477"></a>01477 <a class="code" href="a01684.html#ga6832e4d2d046536b6472f7ac92340f68" title="Carry out a 32-bit addition.">uip_add32</a>(uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>, uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a>);
- <a name="l01478"></a>01478
- <a name="l01479"></a>01479 <span class="keywordflow">if</span>(BUF->ackno[0] == <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[0] &&
- <a name="l01480"></a>01480 BUF->ackno[1] == <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[1] &&
- <a name="l01481"></a>01481 BUF->ackno[2] == <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[2] &&
- <a name="l01482"></a>01482 BUF->ackno[3] == <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[3]) {
- <a name="l01483"></a>01483 <span class="comment">/* Update sequence number. */</span>
- <a name="l01484"></a>01484 uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[0] = <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[0];
- <a name="l01485"></a>01485 uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[1] = <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[1];
- <a name="l01486"></a>01486 uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[2] = <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[2];
- <a name="l01487"></a>01487 uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[3] = <a class="code" href="a01684.html#ga2a0cf5d86c58fab216414ce59bf1fea1" title="4-byte array used for the 32-bit sequence number calculations.">uip_acc32</a>[3];
- <a name="l01488"></a>01488
- <a name="l01489"></a>01489 <span class="comment">/* Do RTT estimation, unless we have done retransmissions. */</span>
- <a name="l01490"></a>01490 <span class="keywordflow">if</span>(uip_connr-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> == 0) {
- <a name="l01491"></a>01491 <span class="keywordtype">signed</span> <span class="keywordtype">char</span> m;
- <a name="l01492"></a>01492 m = uip_connr-><a class="code" href="a00092.html#ae3aa9cc25e45b663e6aabc54c013019e" title="Retransmission time-out.">rto</a> - uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a>;
- <a name="l01493"></a>01493 <span class="comment">/* This is taken directly from VJs original code in his paper */</span>
- <a name="l01494"></a>01494 m = m - (uip_connr-><a class="code" href="a00092.html#aef661afb3aa82f0437d2ed8d3c20be76" title="Retransmission time-out calculation state variable.">sa</a> >> 3);
- <a name="l01495"></a>01495 uip_connr-><a class="code" href="a00092.html#aef661afb3aa82f0437d2ed8d3c20be76" title="Retransmission time-out calculation state variable.">sa</a> += m;
- <a name="l01496"></a>01496 <span class="keywordflow">if</span>(m < 0) {
- <a name="l01497"></a>01497 m = -m;
- <a name="l01498"></a>01498 }
- <a name="l01499"></a>01499 m = m - (uip_connr-><a class="code" href="a00092.html#aeb9fcbd3c9b0a795dcd63f33c323d65c" title="Retransmission time-out calculation state variable.">sv</a> >> 2);
- <a name="l01500"></a>01500 uip_connr-><a class="code" href="a00092.html#aeb9fcbd3c9b0a795dcd63f33c323d65c" title="Retransmission time-out calculation state variable.">sv</a> += m;
- <a name="l01501"></a>01501 uip_connr-><a class="code" href="a00092.html#ae3aa9cc25e45b663e6aabc54c013019e" title="Retransmission time-out.">rto</a> = (uip_connr-><a class="code" href="a00092.html#aef661afb3aa82f0437d2ed8d3c20be76" title="Retransmission time-out calculation state variable.">sa</a> >> 3) + uip_connr-><a class="code" href="a00092.html#aeb9fcbd3c9b0a795dcd63f33c323d65c" title="Retransmission time-out calculation state variable.">sv</a>;
- <a name="l01502"></a>01502
- <a name="l01503"></a>01503 }
- <a name="l01504"></a>01504 <span class="comment">/* Set the acknowledged flag. */</span>
- <a name="l01505"></a>01505 uip_flags = UIP_ACKDATA;
- <a name="l01506"></a>01506 <span class="comment">/* Reset the retransmission timer. */</span>
- <a name="l01507"></a>01507 uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = uip_connr-><a class="code" href="a00092.html#ae3aa9cc25e45b663e6aabc54c013019e" title="Retransmission time-out.">rto</a>;
- <a name="l01508"></a>01508
- <a name="l01509"></a>01509 <span class="comment">/* Reset length of outstanding data. */</span>
- <a name="l01510"></a>01510 uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
- <a name="l01511"></a>01511 }
- <a name="l01512"></a>01512
- <a name="l01513"></a>01513 }
- <a name="l01514"></a>01514
- <a name="l01515"></a>01515 <span class="comment">/* Do different things depending on in what state the connection is. */</span>
- <a name="l01516"></a>01516 <span class="keywordflow">switch</span>(uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> & UIP_TS_MASK) {
- <a name="l01517"></a>01517 <span class="comment">/* CLOSED and LISTEN are not handled here. CLOSE_WAIT is not</span>
- <a name="l01518"></a>01518 <span class="comment"> implemented, since we force the application to close when the</span>
- <a name="l01519"></a>01519 <span class="comment"> peer sends a FIN (hence the application goes directly from</span>
- <a name="l01520"></a>01520 <span class="comment"> ESTABLISHED to LAST_ACK). */</span>
- <a name="l01521"></a>01521 <span class="keywordflow">case</span> UIP_SYN_RCVD:
- <a name="l01522"></a>01522 <span class="comment">/* In SYN_RCVD we have sent out a SYNACK in response to a SYN, and</span>
- <a name="l01523"></a>01523 <span class="comment"> we are waiting for an ACK that acknowledges the data we sent</span>
- <a name="l01524"></a>01524 <span class="comment"> out the last time. Therefore, we want to have the UIP_ACKDATA</span>
- <a name="l01525"></a>01525 <span class="comment"> flag set. If so, we enter the ESTABLISHED state. */</span>
- <a name="l01526"></a>01526 <span class="keywordflow">if</span>(uip_flags & UIP_ACKDATA) {
- <a name="l01527"></a>01527 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_ESTABLISHED;
- <a name="l01528"></a>01528 uip_flags = UIP_CONNECTED;
- <a name="l01529"></a>01529 uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
- <a name="l01530"></a>01530 <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> > 0) {
- <a name="l01531"></a>01531 uip_flags |= UIP_NEWDATA;
- <a name="l01532"></a>01532 uip_add_rcv_nxt(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>);
- <a name="l01533"></a>01533 }
- <a name="l01534"></a>01534 uip_slen = 0;
- <a name="l01535"></a>01535 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l01536"></a>01536 <span class="keywordflow">goto</span> appsend;
- <a name="l01537"></a>01537 }
- <a name="l01538"></a>01538 <span class="comment">/* We need to retransmit the SYNACK */</span>
- <a name="l01539"></a>01539 <span class="keywordflow">if</span>((BUF->flags & TCP_CTL) == TCP_SYN) {
- <a name="l01540"></a>01540 <span class="keywordflow">goto</span> tcp_send_synack;
- <a name="l01541"></a>01541 }
- <a name="l01542"></a>01542 <span class="keywordflow">goto</span> drop;
- <a name="l01543"></a>01543 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
- <a name="l01544"></a>01544 <span class="preprocessor"></span> <span class="keywordflow">case</span> UIP_SYN_SENT:
- <a name="l01545"></a>01545 <span class="comment">/* In SYN_SENT, we wait for a SYNACK that is sent in response to</span>
- <a name="l01546"></a>01546 <span class="comment"> our SYN. The rcv_nxt is set to sequence number in the SYNACK</span>
- <a name="l01547"></a>01547 <span class="comment"> plus one, and we send an ACK. We move into the ESTABLISHED</span>
- <a name="l01548"></a>01548 <span class="comment"> state. */</span>
- <a name="l01549"></a>01549 <span class="keywordflow">if</span>((uip_flags & UIP_ACKDATA) &&
- <a name="l01550"></a>01550 (BUF->flags & TCP_CTL) == (TCP_SYN | TCP_ACK)) {
- <a name="l01551"></a>01551
- <a name="l01552"></a>01552 <span class="comment">/* Parse the TCP MSS option, if present. */</span>
- <a name="l01553"></a>01553 <span class="keywordflow">if</span>((BUF->tcpoffset & 0xf0) > 0x50) {
- <a name="l01554"></a>01554 <span class="keywordflow">for</span>(c = 0; c < ((BUF->tcpoffset >> 4) - 5) << 2 ;) {
- <a name="l01555"></a>01555 opt = uip_buf[UIP_IPTCPH_LEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + c];
- <a name="l01556"></a>01556 <span class="keywordflow">if</span>(opt == TCP_OPT_END) {
- <a name="l01557"></a>01557 <span class="comment">/* End of options. */</span>
- <a name="l01558"></a>01558 <span class="keywordflow">break</span>;
- <a name="l01559"></a>01559 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == TCP_OPT_NOOP) {
- <a name="l01560"></a>01560 ++c;
- <a name="l01561"></a>01561 <span class="comment">/* NOP option. */</span>
- <a name="l01562"></a>01562 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == TCP_OPT_MSS &&
- <a name="l01563"></a>01563 uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 1 + c] == TCP_OPT_MSS_LEN) {
- <a name="l01564"></a>01564 <span class="comment">/* An MSS option with the right option length. */</span>
- <a name="l01565"></a>01565 tmp16 = (uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 2 + c] << 8) |
- <a name="l01566"></a>01566 uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 3 + c];
- <a name="l01567"></a>01567 uip_connr-><a class="code" href="a00092.html#adb7a3fadb68df5fdd37e8b91a2c751ea" title="Initial maximum segment size for the connection.">initialmss</a> =
- <a name="l01568"></a>01568 uip_connr-><a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a> = tmp16 > <a class="code" href="a01585.html#ga4910467b83a639f06739c82cd362037e" title="The TCP maximum segment size.">UIP_TCP_MSS</a>? <a class="code" href="a01585.html#ga4910467b83a639f06739c82cd362037e" title="The TCP maximum segment size.">UIP_TCP_MSS</a>: tmp16;
- <a name="l01569"></a>01569
- <a name="l01570"></a>01570 <span class="comment">/* And we are done processing options. */</span>
- <a name="l01571"></a>01571 <span class="keywordflow">break</span>;
- <a name="l01572"></a>01572 } <span class="keywordflow">else</span> {
- <a name="l01573"></a>01573 <span class="comment">/* All other options have a length field, so that we easily</span>
- <a name="l01574"></a>01574 <span class="comment"> can skip past them. */</span>
- <a name="l01575"></a>01575 <span class="keywordflow">if</span>(uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 1 + c] == 0) {
- <a name="l01576"></a>01576 <span class="comment">/* If the length field is zero, the options are malformed</span>
- <a name="l01577"></a>01577 <span class="comment"> and we don't process them further. */</span>
- <a name="l01578"></a>01578 <span class="keywordflow">break</span>;
- <a name="l01579"></a>01579 }
- <a name="l01580"></a>01580 c += uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 1 + c];
- <a name="l01581"></a>01581 }
- <a name="l01582"></a>01582 }
- <a name="l01583"></a>01583 }
- <a name="l01584"></a>01584 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_ESTABLISHED;
- <a name="l01585"></a>01585 uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[0] = BUF->seqno[0];
- <a name="l01586"></a>01586 uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[1] = BUF->seqno[1];
- <a name="l01587"></a>01587 uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[2] = BUF->seqno[2];
- <a name="l01588"></a>01588 uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[3] = BUF->seqno[3];
- <a name="l01589"></a>01589 uip_add_rcv_nxt(1);
- <a name="l01590"></a>01590 uip_flags = UIP_CONNECTED | UIP_NEWDATA;
- <a name="l01591"></a>01591 uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
- <a name="l01592"></a>01592 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 0;
- <a name="l01593"></a>01593 uip_slen = 0;
- <a name="l01594"></a>01594 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l01595"></a>01595 <span class="keywordflow">goto</span> appsend;
- <a name="l01596"></a>01596 }
- <a name="l01597"></a>01597 <span class="comment">/* Inform the application that the connection failed */</span>
- <a name="l01598"></a>01598 uip_flags = UIP_ABORT;
- <a name="l01599"></a>01599 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l01600"></a>01600 <span class="comment">/* The connection is closed after we send the RST */</span>
- <a name="l01601"></a>01601 uip_conn-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
- <a name="l01602"></a>01602 <span class="keywordflow">goto</span> reset;
- <a name="l01603"></a>01603 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
- <a name="l01604"></a>01604
- <a name="l01605"></a>01605 <span class="keywordflow">case</span> UIP_ESTABLISHED:
- <a name="l01606"></a>01606 <span class="comment">/* In the ESTABLISHED state, we call upon the application to feed</span>
- <a name="l01607"></a>01607 <span class="comment"> data into the uip_buf. If the UIP_ACKDATA flag is set, the</span>
- <a name="l01608"></a>01608 <span class="comment"> application should put new data into the buffer, otherwise we are</span>
- <a name="l01609"></a>01609 <span class="comment"> retransmitting an old segment, and the application should put that</span>
- <a name="l01610"></a>01610 <span class="comment"> data into the buffer.</span>
- <a name="l01611"></a>01611 <span class="comment"></span>
- <a name="l01612"></a>01612 <span class="comment"> If the incoming packet is a FIN, we should close the connection on</span>
- <a name="l01613"></a>01613 <span class="comment"> this side as well, and we send out a FIN and enter the LAST_ACK</span>
- <a name="l01614"></a>01614 <span class="comment"> state. We require that there is no outstanding data; otherwise the</span>
- <a name="l01615"></a>01615 <span class="comment"> sequence numbers will be screwed up. */</span>
- <a name="l01616"></a>01616
- <a name="l01617"></a>01617 <span class="keywordflow">if</span>(BUF->flags & TCP_FIN && !(uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> & UIP_STOPPED)) {
- <a name="l01618"></a>01618 <span class="keywordflow">if</span>(uip_outstanding(uip_connr)) {
- <a name="l01619"></a>01619 <span class="keywordflow">goto</span> drop;
- <a name="l01620"></a>01620 }
- <a name="l01621"></a>01621 uip_add_rcv_nxt(1 + <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>);
- <a name="l01622"></a>01622 uip_flags |= UIP_CLOSE;
- <a name="l01623"></a>01623 <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> > 0) {
- <a name="l01624"></a>01624 uip_flags |= UIP_NEWDATA;
- <a name="l01625"></a>01625 }
- <a name="l01626"></a>01626 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l01627"></a>01627 uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 1;
- <a name="l01628"></a>01628 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_LAST_ACK;
- <a name="l01629"></a>01629 uip_connr-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> = 0;
- <a name="l01630"></a>01630 tcp_send_finack:
- <a name="l01631"></a>01631 BUF->flags = TCP_FIN | TCP_ACK;
- <a name="l01632"></a>01632 <span class="keywordflow">goto</span> tcp_send_nodata;
- <a name="l01633"></a>01633 }
- <a name="l01634"></a>01634
- <a name="l01635"></a>01635 <span class="comment">/* Check the URG flag. If this is set, the segment carries urgent</span>
- <a name="l01636"></a>01636 <span class="comment"> data that we must pass to the application. */</span>
- <a name="l01637"></a>01637 <span class="keywordflow">if</span>((BUF->flags & TCP_URG) != 0) {
- <a name="l01638"></a>01638 <span class="preprocessor">#if UIP_URGDATA > 0</span>
- <a name="l01639"></a>01639 <span class="preprocessor"></span> uip_urglen = (BUF->urgp[0] << 8) | BUF->urgp[1];
- <a name="l01640"></a>01640 <span class="keywordflow">if</span>(uip_urglen > <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>) {
- <a name="l01641"></a>01641 <span class="comment">/* There is more urgent data in the next segment to come. */</span>
- <a name="l01642"></a>01642 uip_urglen = <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>;
- <a name="l01643"></a>01643 }
- <a name="l01644"></a>01644 uip_add_rcv_nxt(uip_urglen);
- <a name="l01645"></a>01645 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> -= uip_urglen;
- <a name="l01646"></a>01646 uip_urgdata = <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a>;
- <a name="l01647"></a>01647 <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> += uip_urglen;
- <a name="l01648"></a>01648 } <span class="keywordflow">else</span> {
- <a name="l01649"></a>01649 uip_urglen = 0;
- <a name="l01650"></a>01650 <span class="preprocessor">#else </span><span class="comment">/* UIP_URGDATA > 0 */</span>
- <a name="l01651"></a>01651 <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = ((<span class="keywordtype">char</span> *)<a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a>) + ((BUF->urgp[0] << 8) | BUF->urgp[1]);
- <a name="l01652"></a>01652 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> -= (BUF->urgp[0] << 8) | BUF->urgp[1];
- <a name="l01653"></a>01653 #endif <span class="comment">/* UIP_URGDATA > 0 */</span>
- <a name="l01654"></a>01654 }
- <a name="l01655"></a>01655
- <a name="l01656"></a>01656 <span class="comment">/* If uip_len > 0 we have TCP data in the packet, and we flag this</span>
- <a name="l01657"></a>01657 <span class="comment"> by setting the UIP_NEWDATA flag and update the sequence number</span>
- <a name="l01658"></a>01658 <span class="comment"> we acknowledge. If the application has stopped the dataflow</span>
- <a name="l01659"></a>01659 <span class="comment"> using uip_stop(), we must not accept any data packets from the</span>
- <a name="l01660"></a>01660 <span class="comment"> remote host. */</span>
- <a name="l01661"></a>01661 <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> > 0 && !(uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> & UIP_STOPPED)) {
- <a name="l01662"></a>01662 uip_flags |= UIP_NEWDATA;
- <a name="l01663"></a>01663 uip_add_rcv_nxt(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>);
- <a name="l01664"></a>01664 }
- <a name="l01665"></a>01665
- <a name="l01666"></a>01666 <span class="comment">/* Check if the available buffer space advertised by the other end</span>
- <a name="l01667"></a>01667 <span class="comment"> is smaller than the initial MSS for this connection. If so, we</span>
- <a name="l01668"></a>01668 <span class="comment"> set the current MSS to the window size to ensure that the</span>
- <a name="l01669"></a>01669 <span class="comment"> application does not send more data than the other end can</span>
- <a name="l01670"></a>01670 <span class="comment"> handle.</span>
- <a name="l01671"></a>01671 <span class="comment"></span>
- <a name="l01672"></a>01672 <span class="comment"> If the remote host advertises a zero window, we set the MSS to</span>
- <a name="l01673"></a>01673 <span class="comment"> the initial MSS so that the application will send an entire MSS</span>
- <a name="l01674"></a>01674 <span class="comment"> of data. This data will not be acknowledged by the receiver,</span>
- <a name="l01675"></a>01675 <span class="comment"> and the application will retransmit it. This is called the</span>
- <a name="l01676"></a>01676 <span class="comment"> "persistent timer" and uses the retransmission mechanim.</span>
- <a name="l01677"></a>01677 <span class="comment"> */</span>
- <a name="l01678"></a>01678 tmp16 = ((<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>)BUF->wnd[0] << 8) + (<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>)BUF->wnd[1];
- <a name="l01679"></a>01679 <span class="keywordflow">if</span>(tmp16 > uip_connr-><a class="code" href="a00092.html#adb7a3fadb68df5fdd37e8b91a2c751ea" title="Initial maximum segment size for the connection.">initialmss</a> ||
- <a name="l01680"></a>01680 tmp16 == 0) {
- <a name="l01681"></a>01681 tmp16 = uip_connr-><a class="code" href="a00092.html#adb7a3fadb68df5fdd37e8b91a2c751ea" title="Initial maximum segment size for the connection.">initialmss</a>;
- <a name="l01682"></a>01682 }
- <a name="l01683"></a>01683 uip_connr-><a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a> = tmp16;
- <a name="l01684"></a>01684
- <a name="l01685"></a>01685 <span class="comment">/* If this packet constitutes an ACK for outstanding data (flagged</span>
- <a name="l01686"></a>01686 <span class="comment"> by the UIP_ACKDATA flag, we should call the application since it</span>
- <a name="l01687"></a>01687 <span class="comment"> might want to send more data. If the incoming packet had data</span>
- <a name="l01688"></a>01688 <span class="comment"> from the peer (as flagged by the UIP_NEWDATA flag), the</span>
- <a name="l01689"></a>01689 <span class="comment"> application must also be notified.</span>
- <a name="l01690"></a>01690 <span class="comment"></span>
- <a name="l01691"></a>01691 <span class="comment"> When the application is called, the global variable uip_len</span>
- <a name="l01692"></a>01692 <span class="comment"> contains the length of the incoming data. The application can</span>
- <a name="l01693"></a>01693 <span class="comment"> access the incoming data through the global pointer</span>
- <a name="l01694"></a>01694 <span class="comment"> uip_appdata, which usually points UIP_IPTCPH_LEN + UIP_LLH_LEN</span>
- <a name="l01695"></a>01695 <span class="comment"> bytes into the uip_buf array.</span>
- <a name="l01696"></a>01696 <span class="comment"></span>
- <a name="l01697"></a>01697 <span class="comment"> If the application wishes to send any data, this data should be</span>
- <a name="l01698"></a>01698 <span class="comment"> put into the uip_appdata and the length of the data should be</span>
- <a name="l01699"></a>01699 <span class="comment"> put into uip_len. If the application don't have any data to</span>
- <a name="l01700"></a>01700 <span class="comment"> send, uip_len must be set to 0. */</span>
- <a name="l01701"></a>01701 <span class="keywordflow">if</span>(uip_flags & (UIP_NEWDATA | UIP_ACKDATA)) {
- <a name="l01702"></a>01702 uip_slen = 0;
- <a name="l01703"></a>01703 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l01704"></a>01704
- <a name="l01705"></a>01705 appsend:
- <a name="l01706"></a>01706
- <a name="l01707"></a>01707 <span class="keywordflow">if</span>(uip_flags & UIP_ABORT) {
- <a name="l01708"></a>01708 uip_slen = 0;
- <a name="l01709"></a>01709 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
- <a name="l01710"></a>01710 BUF->flags = TCP_RST | TCP_ACK;
- <a name="l01711"></a>01711 <span class="keywordflow">goto</span> tcp_send_nodata;
- <a name="l01712"></a>01712 }
- <a name="l01713"></a>01713
- <a name="l01714"></a>01714 <span class="keywordflow">if</span>(uip_flags & UIP_CLOSE) {
- <a name="l01715"></a>01715 uip_slen = 0;
- <a name="l01716"></a>01716 uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 1;
- <a name="l01717"></a>01717 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_FIN_WAIT_1;
- <a name="l01718"></a>01718 uip_connr-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> = 0;
- <a name="l01719"></a>01719 BUF->flags = TCP_FIN | TCP_ACK;
- <a name="l01720"></a>01720 <span class="keywordflow">goto</span> tcp_send_nodata;
- <a name="l01721"></a>01721 }
- <a name="l01722"></a>01722
- <a name="l01723"></a>01723 <span class="comment">/* If uip_slen > 0, the application has data to be sent. */</span>
- <a name="l01724"></a>01724 <span class="keywordflow">if</span>(uip_slen > 0) {
- <a name="l01725"></a>01725
- <a name="l01726"></a>01726 <span class="comment">/* If the connection has acknowledged data, the contents of</span>
- <a name="l01727"></a>01727 <span class="comment"> the ->len variable should be discarded. */</span>
- <a name="l01728"></a>01728 <span class="keywordflow">if</span>((uip_flags & UIP_ACKDATA) != 0) {
- <a name="l01729"></a>01729 uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
- <a name="l01730"></a>01730 }
- <a name="l01731"></a>01731
- <a name="l01732"></a>01732 <span class="comment">/* If the ->len variable is non-zero the connection has</span>
- <a name="l01733"></a>01733 <span class="comment"> already data in transit and cannot send anymore right</span>
- <a name="l01734"></a>01734 <span class="comment"> now. */</span>
- <a name="l01735"></a>01735 <span class="keywordflow">if</span>(uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> == 0) {
- <a name="l01736"></a>01736
- <a name="l01737"></a>01737 <span class="comment">/* The application cannot send more than what is allowed by</span>
- <a name="l01738"></a>01738 <span class="comment"> the mss (the minumum of the MSS and the available</span>
- <a name="l01739"></a>01739 <span class="comment"> window). */</span>
- <a name="l01740"></a>01740 <span class="keywordflow">if</span>(uip_slen > uip_connr-><a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a>) {
- <a name="l01741"></a>01741 uip_slen = uip_connr-><a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a>;
- <a name="l01742"></a>01742 }
- <a name="l01743"></a>01743
- <a name="l01744"></a>01744 <span class="comment">/* Remember how much data we send out now so that we know</span>
- <a name="l01745"></a>01745 <span class="comment"> when everything has been acknowledged. */</span>
- <a name="l01746"></a>01746 uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = uip_slen;
- <a name="l01747"></a>01747 } <span class="keywordflow">else</span> {
- <a name="l01748"></a>01748
- <a name="l01749"></a>01749 <span class="comment">/* If the application already had unacknowledged data, we</span>
- <a name="l01750"></a>01750 <span class="comment"> make sure that the application does not send (i.e.,</span>
- <a name="l01751"></a>01751 <span class="comment"> retransmit) out more than it previously sent out. */</span>
- <a name="l01752"></a>01752 uip_slen = uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a>;
- <a name="l01753"></a>01753 }
- <a name="l01754"></a>01754 }
- <a name="l01755"></a>01755 uip_connr-><a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> = 0;
- <a name="l01756"></a>01756 apprexmit:
- <a name="l01757"></a>01757 <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = uip_sappdata;
- <a name="l01758"></a>01758
- <a name="l01759"></a>01759 <span class="comment">/* If the application has data to be sent, or if the incoming</span>
- <a name="l01760"></a>01760 <span class="comment"> packet had new data in it, we must send out a packet. */</span>
- <a name="l01761"></a>01761 <span class="keywordflow">if</span>(uip_slen > 0 && uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> > 0) {
- <a name="l01762"></a>01762 <span class="comment">/* Add the length of the IP and TCP headers. */</span>
- <a name="l01763"></a>01763 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> + UIP_TCPIP_HLEN;
- <a name="l01764"></a>01764 <span class="comment">/* We always set the ACK flag in response packets. */</span>
- <a name="l01765"></a>01765 BUF->flags = TCP_ACK | TCP_PSH;
- <a name="l01766"></a>01766 <span class="comment">/* Send the packet. */</span>
- <a name="l01767"></a>01767 <span class="keywordflow">goto</span> tcp_send_noopts;
- <a name="l01768"></a>01768 }
- <a name="l01769"></a>01769 <span class="comment">/* If there is no data to send, just send out a pure ACK if</span>
- <a name="l01770"></a>01770 <span class="comment"> there is newdata. */</span>
- <a name="l01771"></a>01771 <span class="keywordflow">if</span>(uip_flags & UIP_NEWDATA) {
- <a name="l01772"></a>01772 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = UIP_TCPIP_HLEN;
- <a name="l01773"></a>01773 BUF->flags = TCP_ACK;
- <a name="l01774"></a>01774 <span class="keywordflow">goto</span> tcp_send_noopts;
- <a name="l01775"></a>01775 }
- <a name="l01776"></a>01776 }
- <a name="l01777"></a>01777 <span class="keywordflow">goto</span> drop;
- <a name="l01778"></a>01778 <span class="keywordflow">case</span> UIP_LAST_ACK:
- <a name="l01779"></a>01779 <span class="comment">/* We can close this connection if the peer has acknowledged our</span>
- <a name="l01780"></a>01780 <span class="comment"> FIN. This is indicated by the UIP_ACKDATA flag. */</span>
- <a name="l01781"></a>01781 <span class="keywordflow">if</span>(uip_flags & UIP_ACKDATA) {
- <a name="l01782"></a>01782 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
- <a name="l01783"></a>01783 uip_flags = UIP_CLOSE;
- <a name="l01784"></a>01784 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l01785"></a>01785 }
- <a name="l01786"></a>01786 <span class="keywordflow">break</span>;
- <a name="l01787"></a>01787
- <a name="l01788"></a>01788 <span class="keywordflow">case</span> UIP_FIN_WAIT_1:
- <a name="l01789"></a>01789 <span class="comment">/* The application has closed the connection, but the remote host</span>
- <a name="l01790"></a>01790 <span class="comment"> hasn't closed its end yet. Thus we do nothing but wait for a</span>
- <a name="l01791"></a>01791 <span class="comment"> FIN from the other side. */</span>
- <a name="l01792"></a>01792 <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> > 0) {
- <a name="l01793"></a>01793 uip_add_rcv_nxt(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>);
- <a name="l01794"></a>01794 }
- <a name="l01795"></a>01795 <span class="keywordflow">if</span>(BUF->flags & TCP_FIN) {
- <a name="l01796"></a>01796 <span class="keywordflow">if</span>(uip_flags & UIP_ACKDATA) {
- <a name="l01797"></a>01797 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_TIME_WAIT;
- <a name="l01798"></a>01798 uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = 0;
- <a name="l01799"></a>01799 uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
- <a name="l01800"></a>01800 } <span class="keywordflow">else</span> {
- <a name="l01801"></a>01801 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSING;
- <a name="l01802"></a>01802 }
- <a name="l01803"></a>01803 uip_add_rcv_nxt(1);
- <a name="l01804"></a>01804 uip_flags = UIP_CLOSE;
- <a name="l01805"></a>01805 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l01806"></a>01806 <span class="keywordflow">goto</span> tcp_send_ack;
- <a name="l01807"></a>01807 } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(uip_flags & UIP_ACKDATA) {
- <a name="l01808"></a>01808 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_FIN_WAIT_2;
- <a name="l01809"></a>01809 uip_connr-><a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
- <a name="l01810"></a>01810 <span class="keywordflow">goto</span> drop;
- <a name="l01811"></a>01811 }
- <a name="l01812"></a>01812 <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> > 0) {
- <a name="l01813"></a>01813 <span class="keywordflow">goto</span> tcp_send_ack;
- <a name="l01814"></a>01814 }
- <a name="l01815"></a>01815 <span class="keywordflow">goto</span> drop;
- <a name="l01816"></a>01816
- <a name="l01817"></a>01817 <span class="keywordflow">case</span> UIP_FIN_WAIT_2:
- <a name="l01818"></a>01818 <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> > 0) {
- <a name="l01819"></a>01819 uip_add_rcv_nxt(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>);
- <a name="l01820"></a>01820 }
- <a name="l01821"></a>01821 <span class="keywordflow">if</span>(BUF->flags & TCP_FIN) {
- <a name="l01822"></a>01822 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_TIME_WAIT;
- <a name="l01823"></a>01823 uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = 0;
- <a name="l01824"></a>01824 uip_add_rcv_nxt(1);
- <a name="l01825"></a>01825 uip_flags = UIP_CLOSE;
- <a name="l01826"></a>01826 <a class="code" href="a01569.html#ga41aa744caa46913b3b3aedb2a4e78546" title="The name of the application function that uIP should call in response to TCP/IP events...">UIP_APPCALL</a>();
- <a name="l01827"></a>01827 <span class="keywordflow">goto</span> tcp_send_ack;
- <a name="l01828"></a>01828 }
- <a name="l01829"></a>01829 <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> > 0) {
- <a name="l01830"></a>01830 <span class="keywordflow">goto</span> tcp_send_ack;
- <a name="l01831"></a>01831 }
- <a name="l01832"></a>01832 <span class="keywordflow">goto</span> drop;
- <a name="l01833"></a>01833
- <a name="l01834"></a>01834 <span class="keywordflow">case</span> UIP_TIME_WAIT:
- <a name="l01835"></a>01835 <span class="keywordflow">goto</span> tcp_send_ack;
- <a name="l01836"></a>01836
- <a name="l01837"></a>01837 <span class="keywordflow">case</span> UIP_CLOSING:
- <a name="l01838"></a>01838 <span class="keywordflow">if</span>(uip_flags & UIP_ACKDATA) {
- <a name="l01839"></a>01839 uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_TIME_WAIT;
- <a name="l01840"></a>01840 uip_connr-><a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = 0;
- <a name="l01841"></a>01841 }
- <a name="l01842"></a>01842 }
- <a name="l01843"></a>01843 <span class="keywordflow">goto</span> drop;
- <a name="l01844"></a>01844
- <a name="l01845"></a>01845 <span class="comment">/* We jump here when we are ready to send the packet, and just want</span>
- <a name="l01846"></a>01846 <span class="comment"> to set the appropriate TCP sequence numbers in the TCP header. */</span>
- <a name="l01847"></a>01847 tcp_send_ack:
- <a name="l01848"></a>01848 BUF->flags = TCP_ACK;
- <a name="l01849"></a>01849
- <a name="l01850"></a>01850 tcp_send_nodata:
- <a name="l01851"></a>01851 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = UIP_IPTCPH_LEN;
- <a name="l01852"></a>01852
- <a name="l01853"></a>01853 tcp_send_noopts:
- <a name="l01854"></a>01854 BUF->tcpoffset = (UIP_TCPH_LEN / 4) << 4;
- <a name="l01855"></a>01855
- <a name="l01856"></a>01856 <span class="comment">/* We're done with the input processing. We are now ready to send a</span>
- <a name="l01857"></a>01857 <span class="comment"> reply. Our job is to fill in all the fields of the TCP and IP</span>
- <a name="l01858"></a>01858 <span class="comment"> headers before calculating the checksum and finally send the</span>
- <a name="l01859"></a>01859 <span class="comment"> packet. */</span>
- <a name="l01860"></a>01860 tcp_send:
- <a name="l01861"></a>01861 BUF->ackno[0] = uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[0];
- <a name="l01862"></a>01862 BUF->ackno[1] = uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[1];
- <a name="l01863"></a>01863 BUF->ackno[2] = uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[2];
- <a name="l01864"></a>01864 BUF->ackno[3] = uip_connr-><a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[3];
- <a name="l01865"></a>01865
- <a name="l01866"></a>01866 BUF->seqno[0] = uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[0];
- <a name="l01867"></a>01867 BUF->seqno[1] = uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[1];
- <a name="l01868"></a>01868 BUF->seqno[2] = uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[2];
- <a name="l01869"></a>01869 BUF->seqno[3] = uip_connr-><a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[3];
- <a name="l01870"></a>01870
- <a name="l01871"></a>01871 BUF->proto = UIP_PROTO_TCP;
- <a name="l01872"></a>01872
- <a name="l01873"></a>01873 BUF->srcport = uip_connr-><a class="code" href="a00092.html#a0cd09beee671e7e9efb0b4aced10249e" title="The local TCP port, in network byte order.">lport</a>;
- <a name="l01874"></a>01874 BUF->destport = uip_connr-><a class="code" href="a00092.html#a1df6aa054ef2fa634ac4c6f418228285" title="The local remote TCP port, in network byte order.">rport</a>;
- <a name="l01875"></a>01875
- <a name="l01876"></a>01876 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->srcipaddr, &uip_hostaddr);
- <a name="l01877"></a>01877 <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&BUF->destipaddr, &uip_connr-><a class="code" href="a00092.html#a79510aa86d3fa0a0fc6cfc49b1da7279" title="The IP address of the remote host.">ripaddr</a>);
- <a name="l01878"></a>01878
- <a name="l01879"></a>01879 <span class="keywordflow">if</span>(uip_connr-><a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> & UIP_STOPPED) {
- <a name="l01880"></a>01880 <span class="comment">/* If the connection has issued uip_stop(), we advertise a zero</span>
- <a name="l01881"></a>01881 <span class="comment"> window so that the remote host will stop sending data. */</span>
- <a name="l01882"></a>01882 BUF->wnd[0] = BUF->wnd[1] = 0;
- <a name="l01883"></a>01883 } <span class="keywordflow">else</span> {
- <a name="l01884"></a>01884 BUF->wnd[0] = ((<a class="code" href="a01585.html#ga5b9dba2123705bce1ce95c3deca0bdad" title="The size of the advertised receiver&#39;s window.">UIP_RECEIVE_WINDOW</a>) >> 8);
- <a name="l01885"></a>01885 BUF->wnd[1] = ((<a class="code" href="a01585.html#ga5b9dba2123705bce1ce95c3deca0bdad" title="The size of the advertised receiver&#39;s window.">UIP_RECEIVE_WINDOW</a>) & 0xff);
- <a name="l01886"></a>01886 }
- <a name="l01887"></a>01887
- <a name="l01888"></a>01888 tcp_send_noconn:
- <a name="l01889"></a>01889 BUF->ttl = <a class="code" href="a01582.html#gab61381673de27f31848c5396bf0b338e" title="The IP TTL (time to live) of IP packets sent by uIP.">UIP_TTL</a>;
- <a name="l01890"></a>01890 <span class="preprocessor">#if UIP_CONF_IPV6</span>
- <a name="l01891"></a>01891 <span class="preprocessor"></span> <span class="comment">/* For IPv6, the IP length field does not include the IPv6 IP header</span>
- <a name="l01892"></a>01892 <span class="comment"> length. */</span>
- <a name="l01893"></a>01893 BUF->len[0] = ((<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> - UIP_IPH_LEN) >> 8);
- <a name="l01894"></a>01894 BUF->len[1] = ((<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> - UIP_IPH_LEN) & 0xff);
- <a name="l01895"></a>01895 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l01896"></a>01896 BUF->len[0] = (<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> >> 8);
- <a name="l01897"></a>01897 BUF->len[1] = (<a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> & 0xff);
- <a name="l01898"></a>01898 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l01899"></a>01899
- <a name="l01900"></a>01900 BUF->urgp[0] = BUF->urgp[1] = 0;
- <a name="l01901"></a>01901
- <a name="l01902"></a>01902 <span class="comment">/* Calculate TCP checksum. */</span>
- <a name="l01903"></a>01903 BUF->tcpchksum = 0;
- <a name="l01904"></a>01904 BUF->tcpchksum = ~(<a class="code" href="a01684.html#ga85b65e38aa74eba18979156f97a94a87" title="Calculate the TCP checksum of the packet in uip_buf and uip_appdata.">uip_tcpchksum</a>());
- <a name="l01905"></a>01905
- <a name="l01906"></a>01906 ip_send_nolen:
- <a name="l01907"></a>01907 <span class="preprocessor">#if UIP_CONF_IPV6</span>
- <a name="l01908"></a>01908 <span class="preprocessor"></span> BUF->vtc = 0x60;
- <a name="l01909"></a>01909 BUF->tcflow = 0x00;
- <a name="l01910"></a>01910 BUF->flow = 0x00;
- <a name="l01911"></a>01911 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l01912"></a>01912 BUF->vhl = 0x45;
- <a name="l01913"></a>01913 BUF->tos = 0;
- <a name="l01914"></a>01914 BUF->ipoffset[0] = BUF->ipoffset[1] = 0;
- <a name="l01915"></a>01915 ++ipid;
- <a name="l01916"></a>01916 BUF->ipid[0] = ipid >> 8;
- <a name="l01917"></a>01917 BUF->ipid[1] = ipid & 0xff;
- <a name="l01918"></a>01918 <span class="comment">/* Calculate IP checksum. */</span>
- <a name="l01919"></a>01919 BUF->ipchksum = 0;
- <a name="l01920"></a>01920 BUF->ipchksum = ~(<a class="code" href="a01684.html#ga2addf34c7d457c1a7899a7e2171ef1e9" title="Calculate the IP header checksum of the packet header in uip_buf.">uip_ipchksum</a>());
- <a name="l01921"></a>01921 DEBUG_PRINTF(<span class="stringliteral">"uip ip_send_nolen: chkecum 0x%04x\n"</span>, <a class="code" href="a01684.html#ga2addf34c7d457c1a7899a7e2171ef1e9" title="Calculate the IP header checksum of the packet header in uip_buf.">uip_ipchksum</a>());
- <a name="l01922"></a>01922 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l01923"></a>01923 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.sent);
- <a name="l01924"></a>01924 <span class="preprocessor">#if UIP_CONF_IPV6</span>
- <a name="l01925"></a>01925 <span class="preprocessor"></span> send:
- <a name="l01926"></a>01926 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- <a name="l01927"></a>01927 DEBUG_PRINTF(<span class="stringliteral">"Sending packet with length %d (%d)\n"</span>, <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>,
- <a name="l01928"></a>01928 (BUF->len[0] << 8) | BUF->len[1]);
- <a name="l01929"></a>01929
- <a name="l01930"></a>01930 <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.sent);
- <a name="l01931"></a>01931 <span class="comment">/* Return and let the caller do the actual transmission. */</span>
- <a name="l01932"></a>01932 uip_flags = 0;
- <a name="l01933"></a>01933 <span class="keywordflow">return</span>;
- <a name="l01934"></a>01934
- <a name="l01935"></a>01935 drop:
- <a name="l01936"></a>01936 <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 0;
- <a name="l01937"></a>01937 uip_flags = 0;
- <a name="l01938"></a>01938 <span class="keywordflow">return</span>;
- <a name="l01939"></a>01939 }
- <a name="l01940"></a>01940 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l01941"></a>01941 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
- <a name="l01942"></a><a class="code" href="a01576.html#gac4ea3f328aea8bd4ed26e9c5e51e78b1">01942</a> <a class="code" href="a01684.html#gae4394b6b3cd81f73b0e64a93e0558e00" title="Convert 16-bit quantity from host byte order to network byte order.">uip_htons</a>(<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> val)
- <a name="l01943"></a>01943 {
- <a name="l01944"></a>01944 <span class="keywordflow">return</span> <a class="code" href="a01576.html#ga703ee949a28cb00b5f8ee54bfe664e8d" title="Convert 16-bit quantity from host byte order to network byte order.">UIP_HTONS</a>(val);
- <a name="l01945"></a>01945 }
- <a name="l01946"></a>01946
- <a name="l01947"></a>01947 <a class="code" href="a01668.html#ga4c14294869aceba3ef9d4c0c302d0f33" title="The 32-bit unsigned data type.">u32_t</a>
- <a name="l01948"></a>01948 uip_htonl(<a class="code" href="a01668.html#ga4c14294869aceba3ef9d4c0c302d0f33" title="The 32-bit unsigned data type.">u32_t</a> val)
- <a name="l01949"></a>01949 {
- <a name="l01950"></a>01950 <span class="keywordflow">return</span> UIP_HTONL(val);
- <a name="l01951"></a>01951 }
- <a name="l01952"></a>01952 <span class="comment">/*---------------------------------------------------------------------------*/</span>
- <a name="l01953"></a>01953 <span class="keywordtype">void</span>
- <a name="l01954"></a><a class="code" href="a01575.html#ga73635e084b87a4dd7535f579e680f268">01954</a> <a class="code" href="a01684.html#ga04b053a623aac7cd4195157d470661b3" title="Send data on the current connection.">uip_send</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *data, <span class="keywordtype">int</span> len)
- <a name="l01955"></a>01955 {
- <a name="l01956"></a>01956 <span class="keywordtype">int</span> copylen;
- <a name="l01957"></a>01957 <span class="preprocessor">#define MIN(a,b) ((a) < (b)? (a): (b))</span>
- <a name="l01958"></a>01958 <span class="preprocessor"></span> copylen = MIN(len, <a class="code" href="a01589.html#ga3589822ecb9d9c4145209756396b8a6b" title="The size of the uIP packet buffer.">UIP_BUFSIZE</a> - <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> - UIP_TCPIP_HLEN -
- <a name="l01959"></a>01959 (<span class="keywordtype">int</span>)((<span class="keywordtype">char</span> *)uip_sappdata - (<span class="keywordtype">char</span> *)&uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + UIP_TCPIP_HLEN]));
- <a name="l01960"></a>01960 <span class="keywordflow">if</span>(copylen > 0) {
- <a name="l01961"></a>01961 uip_slen = copylen;
- <a name="l01962"></a>01962 <span class="keywordflow">if</span>(data != uip_sappdata) {
- <a name="l01963"></a>01963 memcpy(uip_sappdata, (data), uip_slen);
- <a name="l01964"></a>01964 }
- <a name="l01965"></a>01965 }
- <a name="l01966"></a>01966 }
- <a name="l01967"></a>01967 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
- <a name="l01968"></a>01968 <span class="comment">/** @} */</span>
- <a name="l01969"></a>01969 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
- </pre></div></div>
- <hr size="1"/><address style="text-align: right;"><small>Generated on Mon Apr 11 14:23:32 2011 for Contiki 2.5 by
- <a href="http://www.doxygen.org/index.html">
- <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.1 </small></address>
- </body>
- </html>