PageRenderTime 50ms CodeModel.GetById 18ms RepoModel.GetById 1ms app.codeStats 1ms

/a00425_source.html

https://github.com/krackeroda/contiki-doxygen
HTML | 2258 lines | 2257 code | 0 blank | 1 comment | 0 complexity | 3af8a923dfb86a3e41ca95c813e6644b MD5 | raw file
    

  1. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    2. 

  2. <html xmlns="http://www.w3.org/1999/xhtml">
    3. 

  3. <head>
    4. 

  4. <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
    5. 

  5. <title>Contiki 2.5: core/net/uip6.c Source File</title>
    6. 

  6. <link href="tabs.css" rel="stylesheet" type="text/css"/>
    7. 

  7. <link href="doxygen.css" rel="stylesheet" type="text/css"/>
    8. 

  8. </head>
    9. 

  9. <body>
    10. 

  10. <!-- Generated by Doxygen 1.6.1 -->
    11. 

  11. <div class="navigation" id="top">
    12. 

  12.   <div class="tabs">
    13. 

  13.     <ul>
    14. 

  14.       <li><a href="main.html"><span>Main&nbsp;Page</span></a></li>
    15. 

  15.       <li><a href="pages.html"><span>Related&nbsp;Pages</span></a></li>
    16. 

  16.       <li><a href="modules.html"><span>Modules</span></a></li>
    17. 

  17.       <li><a href="annotated.html"><span>Data&nbsp;Structures</span></a></li>
    18. 

  18.       <li class="current"><a href="files.html"><span>Files</span></a></li>
    19. 

  19.       <li><a href="dirs.html"><span>Directories</span></a></li>
    20. 

  20.       <li><a href="examples.html"><span>Examples</span></a></li>
    21. 

  21.     </ul>
    22. 

  22.   </div>
    23. 

  23.   <div class="tabs">
    24. 

  24.     <ul>
    25. 

  25.       <li><a href="files.html"><span>File&nbsp;List</span></a></li>
    26. 

  26.       <li><a href="globals.html"><span>Globals</span></a></li>
    27. 

  27.     </ul>
    28. 

  28.   </div>
    29. 

  29.   <div class="navpath"><a class="el" href="dir_783dcb2b4bcfa12326370fa26c216025.html">core</a>&nbsp;&raquo&nbsp;<a class="el" href="dir_0966c75b31335e5cb5b37dbb7a80da85.html">net</a>
    30. 

  30.   </div>
    31. 

  31. </div>
    32. 

  32. <div class="contents">
    33. 

  33. <h1>uip6.c</h1><a href="a00425.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/**</span>
    34. 

  34. <a name="l00002"></a>00002 <span class="comment"> * \addtogroup uip6</span>
    35. 

  35. <a name="l00003"></a>00003 <span class="comment"> * @{</span>
    36. 

  36. <a name="l00004"></a>00004 <span class="comment"> */</span>
    37. 

  37. <a name="l00005"></a>00005 <span class="comment"></span>
    38. 

  38. <a name="l00006"></a>00006 <span class="comment">/**</span>
    39. 

  39. <a name="l00007"></a>00007 <span class="comment"> * \file</span>
    40. 

  40. <a name="l00008"></a>00008 <span class="comment"> *         The uIP TCP/IPv6 stack code.</span>
    41. 

  41. <a name="l00009"></a>00009 <span class="comment"> *</span>
    42. 

  42. <a name="l00010"></a>00010 <span class="comment"> * \author Adam Dunkels &lt;adam@sics.se&gt;</span>
    43. 

  43. <a name="l00011"></a>00011 <span class="comment"> * \author Julien Abeille &lt;jabeille@cisco.com&gt; (IPv6 related code)</span>
    44. 

  44. <a name="l00012"></a>00012 <span class="comment"> * \author Mathilde Durvy &lt;mdurvy@cisco.com&gt; (IPv6 related code)</span>
    45. 

  45. <a name="l00013"></a>00013 <span class="comment"> */</span>
    46. 

  46. <a name="l00014"></a>00014 <span class="comment">/*</span>
    47. 

  47. <a name="l00015"></a>00015 <span class="comment"> * Copyright (c) 2001-2003, Adam Dunkels.</span>
    48. 

  48. <a name="l00016"></a>00016 <span class="comment"> * All rights reserved.</span>
    49. 

  49. <a name="l00017"></a>00017 <span class="comment"> *</span>
    50. 

  50. <a name="l00018"></a>00018 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
    51. 

  51. <a name="l00019"></a>00019 <span class="comment"> * modification, are permitted provided that the following conditions</span>
    52. 

  52. <a name="l00020"></a>00020 <span class="comment"> * are met:</span>
    53. 

  53. <a name="l00021"></a>00021 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
    54. 

  54. <a name="l00022"></a>00022 <span class="comment"> *    notice, this list of conditions and the following disclaimer.</span>
    55. 

  55. <a name="l00023"></a>00023 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
    56. 

  56. <a name="l00024"></a>00024 <span class="comment"> *    notice, this list of conditions and the following disclaimer in the</span>
    57. 

  57. <a name="l00025"></a>00025 <span class="comment"> *    documentation and/or other materials provided with the distribution.</span>
    58. 

  58. <a name="l00026"></a>00026 <span class="comment"> * 3. The name of the author may not be used to endorse or promote</span>
    59. 

  59. <a name="l00027"></a>00027 <span class="comment"> *    products derived from this software without specific prior</span>
    60. 

  60. <a name="l00028"></a>00028 <span class="comment"> *    written permission.</span>
    61. 

  61. <a name="l00029"></a>00029 <span class="comment"> *</span>
    62. 

  62. <a name="l00030"></a>00030 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS&apos;&apos; AND ANY EXPRESS</span>
    63. 

  63. <a name="l00031"></a>00031 <span class="comment"> * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span>
    64. 

  64. <a name="l00032"></a>00032 <span class="comment"> * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
    65. 

  65. <a name="l00033"></a>00033 <span class="comment"> * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY</span>
    66. 

  66. <a name="l00034"></a>00034 <span class="comment"> * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
    67. 

  67. <a name="l00035"></a>00035 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE</span>
    68. 

  68. <a name="l00036"></a>00036 <span class="comment"> * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
    69. 

  69. <a name="l00037"></a>00037 <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,</span>
    70. 

  70. <a name="l00038"></a>00038 <span class="comment"> * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING</span>
    71. 

  71. <a name="l00039"></a>00039 <span class="comment"> * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span>
    72. 

  72. <a name="l00040"></a>00040 <span class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
    73. 

  73. <a name="l00041"></a>00041 <span class="comment"> *</span>
    74. 

  74. <a name="l00042"></a>00042 <span class="comment"> * This file is part of the uIP TCP/IP stack.</span>
    75. 

  75. <a name="l00043"></a>00043 <span class="comment"> *</span>
    76. 

  76. <a name="l00044"></a>00044 <span class="comment"> * $Id: uip6.c,v 1.25 2011/01/04 22:11:37 joxe Exp $</span>
    77. 

  77. <a name="l00045"></a>00045 <span class="comment"> *</span>
    78. 

  78. <a name="l00046"></a>00046 <span class="comment"> */</span>
    79. 

  79. <a name="l00047"></a>00047 
    80. 

  80. <a name="l00048"></a>00048 <span class="comment">/*</span>
    81. 

  81. <a name="l00049"></a>00049 <span class="comment"> * uIP is a small implementation of the IP, UDP and TCP protocols (as</span>
    82. 

  82. <a name="l00050"></a>00050 <span class="comment"> * well as some basic ICMP stuff). The implementation couples the IP,</span>
    83. 

  83. <a name="l00051"></a>00051 <span class="comment"> * UDP, TCP and the application layers very tightly. To keep the size</span>
    84. 

  84. <a name="l00052"></a>00052 <span class="comment"> * of the compiled code down, this code frequently uses the goto</span>
    85. 

  85. <a name="l00053"></a>00053 <span class="comment"> * statement. While it would be possible to break the uip_process()</span>
    86. 

  86. <a name="l00054"></a>00054 <span class="comment"> * function into many smaller functions, this would increase the code</span>
    87. 

  87. <a name="l00055"></a>00055 <span class="comment"> * size because of the overhead of parameter passing and the fact that</span>
    88. 

  88. <a name="l00056"></a>00056 <span class="comment"> * the optimier would not be as efficient.</span>
    89. 

  89. <a name="l00057"></a>00057 <span class="comment"> *</span>
    90. 

  90. <a name="l00058"></a>00058 <span class="comment"> * The principle is that we have a small buffer, called the uip_buf,</span>
    91. 

  91. <a name="l00059"></a>00059 <span class="comment"> * in which the device driver puts an incoming packet. The TCP/IP</span>
    92. 

  92. <a name="l00060"></a>00060 <span class="comment"> * stack parses the headers in the packet, and calls the</span>
    93. 

  93. <a name="l00061"></a>00061 <span class="comment"> * application. If the remote host has sent data to the application,</span>
    94. 

  94. <a name="l00062"></a>00062 <span class="comment"> * this data is present in the uip_buf and the application read the</span>
    95. 

  95. <a name="l00063"></a>00063 <span class="comment"> * data from there. It is up to the application to put this data into</span>
    96. 

  96. <a name="l00064"></a>00064 <span class="comment"> * a byte stream if needed. The application will not be fed with data</span>
    97. 

  97. <a name="l00065"></a>00065 <span class="comment"> * that is out of sequence.</span>
    98. 

  98. <a name="l00066"></a>00066 <span class="comment"> *</span>
    99. 

  99. <a name="l00067"></a>00067 <span class="comment"> * If the application whishes to send data to the peer, it should put</span>
    100. 

  100. <a name="l00068"></a>00068 <span class="comment"> * its data into the uip_buf. The uip_appdata pointer points to the</span>
    101. 

  101. <a name="l00069"></a>00069 <span class="comment"> * first available byte. The TCP/IP stack will calculate the</span>
    102. 

  102. <a name="l00070"></a>00070 <span class="comment"> * checksums, and fill in the necessary header fields and finally send</span>
    103. 

  103. <a name="l00071"></a>00071 <span class="comment"> * the packet back to the peer.</span>
    104. 

  104. <a name="l00072"></a>00072 <span class="comment"> */</span>
    105. 

  105. <a name="l00073"></a>00073 
    106. 

  106. <a name="l00074"></a>00074 <span class="preprocessor">#include &quot;<a class="code" href="a00424.html" title="Header file for the uIP TCP/IP stack.">net/uip.h</a>&quot;</span>
    107. 

  107. <a name="l00075"></a>00075 <span class="preprocessor">#include &quot;<a class="code" href="a00431.html" title="Configuration options for uIP.">net/uipopt.h</a>&quot;</span>
    108. 

  108. <a name="l00076"></a>00076 <span class="preprocessor">#include &quot;<a class="code" href="a00410.html" title="ICMPv6 echo request and error messages (RFC 4443).">net/uip-icmp6.h</a>&quot;</span>
    109. 

  109. <a name="l00077"></a>00077 <span class="preprocessor">#include &quot;<a class="code" href="a00412.html" title="Neighbor discovery (RFC 4861).">net/uip-nd6.h</a>&quot;</span>
    110. 

  110. <a name="l00078"></a>00078 <span class="preprocessor">#include &quot;<a class="code" href="a00404.html" title="Network interface and stateless autoconfiguration (RFC 4862).">net/uip-ds6.h</a>&quot;</span>
    111. 

  111. <a name="l00079"></a>00079 
    112. 

  112. <a name="l00080"></a>00080 <span class="preprocessor">#include &lt;string.h&gt;</span>
    113. 

  113. <a name="l00081"></a>00081 
    114. 

  114. <a name="l00082"></a>00082 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    115. 

  115. <a name="l00083"></a>00083 <span class="comment">/* For Debug, logging, statistics                                            */</span>
    116. 

  116. <a name="l00084"></a>00084 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    117. 

  117. <a name="l00085"></a>00085 
    118. 

  118. <a name="l00086"></a>00086 <span class="preprocessor">#define DEBUG 0</span>
    119. 

  119. <a name="l00087"></a>00087 <span class="preprocessor"></span><span class="preprocessor">#if DEBUG</span>
    120. 

  120. <a name="l00088"></a>00088 <span class="preprocessor"></span><span class="preprocessor">#include &lt;stdio.h&gt;</span>
    121. 

  121. <a name="l00089"></a>00089 <span class="preprocessor">#define PRINTF(...) printf(__VA_ARGS__)</span>
    122. 

  122. <a name="l00090"></a>00090 <span class="preprocessor"></span><span class="preprocessor">#define PRINT6ADDR(addr) PRINTF(&quot; %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x &quot;, ((u8_t *)addr)[0], ((u8_t *)addr)[1], ((u8_t *)addr)[2], ((u8_t *)addr)[3], ((u8_t *)addr)[4], ((u8_t *)addr)[5], ((u8_t *)addr)[6], ((u8_t *)addr)[7], ((u8_t *)addr)[8], ((u8_t *)addr)[9], ((u8_t *)addr)[10], ((u8_t *)addr)[11], ((u8_t *)addr)[12], ((u8_t *)addr)[13], ((u8_t *)addr)[14], ((u8_t *)addr)[15])</span>
    123. 

  123. <a name="l00091"></a>00091 <span class="preprocessor"></span><span class="preprocessor">#define PRINTLLADDR(lladdr) PRINTF(&quot; %02x:%02x:%02x:%02x:%02x:%02x &quot;,lladdr-&gt;addr[0], lladdr-&gt;addr[1], lladdr-&gt;addr[2], lladdr-&gt;addr[3],lladdr-&gt;addr[4], lladdr-&gt;addr[5])</span>
    124. 

  124. <a name="l00092"></a>00092 <span class="preprocessor"></span><span class="preprocessor">#else</span>
    125. 

  125. <a name="l00093"></a>00093 <span class="preprocessor"></span><span class="preprocessor">#define PRINTF(...)</span>
    126. 

  126. <a name="l00094"></a>00094 <span class="preprocessor"></span><span class="preprocessor">#define PRINT6ADDR(addr)</span>
    127. 

  127. <a name="l00095"></a>00095 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
    128. 

  128. <a name="l00096"></a>00096 <span class="preprocessor"></span>
    129. 

  129. <a name="l00097"></a>00097 <span class="preprocessor">#if UIP_CONF_IPV6_RPL</span>
    130. 

  130. <a name="l00098"></a>00098 <span class="preprocessor"></span><span class="keywordtype">void</span> uip_rpl_input(<span class="keywordtype">void</span>);
    131. 

  131. <a name="l00099"></a>00099 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6_RPL */</span>
    132. 

  132. <a name="l00100"></a>00100 
    133. 

  133. <a name="l00101"></a>00101 <span class="preprocessor">#if UIP_LOGGING == 1</span>
    134. 

  134. <a name="l00102"></a>00102 <span class="preprocessor"></span><span class="preprocessor">#include &lt;stdio.h&gt;</span>
    135. 

  135. <a name="l00103"></a>00103 <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);
    136. 

  136. <a name="l00104"></a>00104 <span class="preprocessor">#define UIP_LOG(m) uip_log(m)</span>
    137. 

  137. <a name="l00105"></a>00105 <span class="preprocessor"></span><span class="preprocessor">#else</span>
    138. 

  138. <a name="l00106"></a>00106 <span class="preprocessor"></span><span class="preprocessor">#define UIP_LOG(m)</span>
    139. 

  139. <a name="l00107"></a>00107 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* UIP_LOGGING == 1 */</span>
    140. 

  140. <a name="l00108"></a>00108 
    141. 

  141. <a name="l00109"></a>00109 <span class="preprocessor">#if UIP_STATISTICS == 1</span>
    142. 

  142. <a name="l00110"></a>00110 <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;
    143. 

  143. <a name="l00111"></a>00111 <span class="preprocessor">#endif </span><span class="comment">/* UIP_STATISTICS == 1 */</span>
    144. 

  144. <a name="l00112"></a>00112  
    145. 

  145. <a name="l00113"></a>00113 
    146. 

  146. <a name="l00114"></a>00114 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
    147. 

  147. <a name="l00115"></a>00115 <span class="comment">/** @{ \name Layer 2 variables */</span>
    148. 

  148. <a name="l00116"></a>00116 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
    149. 

  149. <a name="l00117"></a>00117 <span class="comment">/** Host L2 address */</span>
    150. 

  150. <a name="l00118"></a>00118 <span class="preprocessor">#if UIP_CONF_LL_802154</span>
    151. 

  151. <a name="l00119"></a>00119 <span class="preprocessor"></span><a class="code" href="a00102.html" title="802.3 address">uip_lladdr_t</a> <a class="code" href="a01684.html#ga89bf167a9f1014d2d78754742eb7e06d" title="Host L2 address.">uip_lladdr</a>;
    152. 

  152. <a name="l00120"></a>00120 <span class="preprocessor">#else </span><span class="comment">/*UIP_CONF_LL_802154*/</span>
    153. 

  153. <a name="l00121"></a><a class="code" href="a01685.html#ga4084552512a9e2a0678f6a17fefb1a60">00121</a> <a class="code" href="a00102.html" title="802.3 address">uip_lladdr_t</a> <a class="code" href="a01684.html#ga89bf167a9f1014d2d78754742eb7e06d" title="Host L2 address.">uip_lladdr</a> = {{0x00,0x06,0x98,0x00,0x02,0x32}};
    154. 

  154. <a name="l00122"></a>00122 <span class="preprocessor">#endif </span><span class="comment">/*UIP_CONF_LL_802154*/</span>
    155. 

  155. <a name="l00123"></a>00123 <span class="comment">/** @} */</span>
    156. 

  156. <a name="l00124"></a>00124 
    157. 

  157. <a name="l00125"></a>00125 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
    158. 

  158. <a name="l00126"></a>00126 <span class="comment">/** @{ \name Layer 3 variables */</span>
    159. 

  159. <a name="l00127"></a>00127 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
    160. 

  160. <a name="l00128"></a>00128 <span class="comment">/**</span>
    161. 

  161. <a name="l00129"></a>00129 <span class="comment"> * \brief Type of the next header in IPv6 header or extension headers</span>
    162. 

  162. <a name="l00130"></a>00130 <span class="comment"> *</span>
    163. 

  163. <a name="l00131"></a>00131 <span class="comment"> * Can be the next header field in the IPv6 header or in an extension header.</span>
    164. 

  164. <a name="l00132"></a>00132 <span class="comment"> * When doing fragment reassembly, we must change the value of the next header</span>
    165. 

  165. <a name="l00133"></a>00133 <span class="comment"> * field in the header before the fragmentation header, hence we need a pointer</span>
    166. 

  166. <a name="l00134"></a>00134 <span class="comment"> * to this field.</span>
    167. 

  167. <a name="l00135"></a>00135 <span class="comment"> */</span>
    168. 

  168. <a name="l00136"></a><a class="code" href="a01685.html#gaa605d238ba40e21d7200fe94d6abc46d">00136</a> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *<a class="code" href="a01685.html#gaa605d238ba40e21d7200fe94d6abc46d" title="Type of the next header in IPv6 header or extension headers.">uip_next_hdr</a>;<span class="comment"></span>
    169. 

  169. <a name="l00137"></a>00137 <span class="comment">/** \brief bitmap we use to record which IPv6 headers we have already seen */</span>
    170. 

  170. <a name="l00138"></a><a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef">00138</a> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> <a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> = 0;<span class="comment"></span>
    171. 

  171. <a name="l00139"></a>00139 <span class="comment">/**</span>
    172. 

  172. <a name="l00140"></a>00140 <span class="comment"> * \brief length of the extension headers read. updated each time we process</span>
    173. 

  173. <a name="l00141"></a>00141 <span class="comment"> * a header</span>
    174. 

  174. <a name="l00142"></a>00142 <span class="comment"> */</span>
    175. 

  175. <a name="l00143"></a><a class="code" href="a01685.html#ga1c9ed2d0cf3e1b814dc19b76487bed50">00143</a> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> = 0;<span class="comment"></span>
    176. 

  176. <a name="l00144"></a>00144 <span class="comment">/** \brief length of the header options read */</span>
    177. 

  177. <a name="l00145"></a><a class="code" href="a01685.html#ga03780ccf09de63153b3b10c5d11875ab">00145</a> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> <a class="code" href="a01685.html#ga03780ccf09de63153b3b10c5d11875ab" title="length of the header options read">uip_ext_opt_offset</a> = 0;<span class="comment"></span>
    178. 

  178. <a name="l00146"></a>00146 <span class="comment">/** @} */</span>
    179. 

  179. <a name="l00147"></a>00147 
    180. 

  180. <a name="l00148"></a>00148 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    181. 

  181. <a name="l00149"></a>00149 <span class="comment">/* Buffers                                                                   */</span>
    182. 

  182. <a name="l00150"></a>00150 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
    183. 

  183. <a name="l00151"></a>00151 <span class="comment">/** \name Buffer defines</span>
    184. 

  184. <a name="l00152"></a>00152 <span class="comment"> *  @{</span>
    185. 

  185. <a name="l00153"></a>00153 <span class="comment"> */</span>
    186. 

  186. <a name="l00154"></a>00154 <span class="preprocessor">#define FBUF                             ((struct uip_tcpip_hdr *)&amp;uip_reassbuf[0])</span>
    187. 

  187. <a name="l00155"></a>00155 <span class="preprocessor"></span><span class="preprocessor">#define UIP_IP_BUF                          ((struct uip_ip_hdr *)&amp;uip_buf[UIP_LLH_LEN])</span>
    188. 

  188. <a name="l00156"></a>00156 <span class="preprocessor"></span><span class="preprocessor">#define UIP_ICMP_BUF                      ((struct uip_icmp_hdr *)&amp;uip_buf[uip_l2_l3_hdr_len])</span>
    189. 

  189. <a name="l00157"></a>00157 <span class="preprocessor"></span><span class="preprocessor">#define UIP_UDP_BUF                        ((struct uip_udp_hdr *)&amp;uip_buf[uip_l2_l3_hdr_len])</span>
    190. 

  190. <a name="l00158"></a>00158 <span class="preprocessor"></span><span class="preprocessor">#define UIP_TCP_BUF                        ((struct uip_tcp_hdr *)&amp;uip_buf[uip_l2_l3_hdr_len])</span>
    191. 

  191. <a name="l00159"></a>00159 <span class="preprocessor"></span><span class="preprocessor">#define UIP_EXT_BUF                        ((struct uip_ext_hdr *)&amp;uip_buf[uip_l2_l3_hdr_len])</span>
    192. 

  192. <a name="l00160"></a>00160 <span class="preprocessor"></span><span class="preprocessor">#define UIP_ROUTING_BUF                ((struct uip_routing_hdr *)&amp;uip_buf[uip_l2_l3_hdr_len])</span>
    193. 

  193. <a name="l00161"></a>00161 <span class="preprocessor"></span><span class="preprocessor">#define UIP_FRAG_BUF                      ((struct uip_frag_hdr *)&amp;uip_buf[uip_l2_l3_hdr_len])</span>
    194. 

  194. <a name="l00162"></a>00162 <span class="preprocessor"></span><span class="preprocessor">#define UIP_HBHO_BUF                      ((struct uip_hbho_hdr *)&amp;uip_buf[uip_l2_l3_hdr_len])</span>
    195. 

  195. <a name="l00163"></a>00163 <span class="preprocessor"></span><span class="preprocessor">#define UIP_DESTO_BUF                    ((struct uip_desto_hdr *)&amp;uip_buf[uip_l2_l3_hdr_len])</span>
    196. 

  196. <a name="l00164"></a>00164 <span class="preprocessor"></span><span class="preprocessor">#define UIP_EXT_HDR_OPT_BUF            ((struct uip_ext_hdr_opt *)&amp;uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])</span>
    197. 

  197. <a name="l00165"></a>00165 <span class="preprocessor"></span><span class="preprocessor">#define UIP_EXT_HDR_OPT_PADN_BUF  ((struct uip_ext_hdr_opt_padn *)&amp;uip_buf[uip_l2_l3_hdr_len + uip_ext_opt_offset])</span>
    198. 

  198. <a name="l00166"></a>00166 <span class="preprocessor"></span><span class="preprocessor">#define UIP_ICMP6_ERROR_BUF            ((struct uip_icmp6_error *)&amp;uip_buf[uip_l2_l3_icmp_hdr_len])</span>
    199. 

  199. <a name="l00167"></a>00167 <span class="preprocessor"></span><span class="comment">/** @} */</span><span class="comment"></span>
    200. 

  200. <a name="l00168"></a>00168 <span class="comment">/** \name Buffer variables</span>
    201. 

  201. <a name="l00169"></a>00169 <span class="comment"> *  @{</span>
    202. 

  202. <a name="l00170"></a>00170 <span class="comment"> */</span><span class="comment"></span>
    203. 

  203. <a name="l00171"></a>00171 <span class="comment">/** Packet buffer for incoming and outgoing packets */</span>
    204. 

  204. <a name="l00172"></a>00172 <span class="preprocessor">#ifndef UIP_CONF_EXTERNAL_BUFFER</span>
    205. 

  205. <a name="l00173"></a><a class="code" href="a01685.html#gae7f37f0b1fb5172aad84a32067c4ccc7">00173</a> <span class="preprocessor"></span><a class="code" href="a00091.html" title="The uIP packet buffer.">uip_buf_t</a> uip_aligned_buf;
    206. 

  206. <a name="l00174"></a>00174 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_EXTERNAL_BUFFER */</span>
    207. 

  207. <a name="l00175"></a>00175 
    208. 

  208. <a name="l00176"></a>00176 <span class="comment">/* The uip_appdata pointer points to application data. */</span>
    209. 

  209. <a name="l00177"></a><a class="code" href="a01685.html#ga561b8eda32e059d4e7397f776268cc63">00177</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>;
    210. 

  210. <a name="l00178"></a>00178 <span class="comment">/* The uip_appdata pointer points to the application data which is to be sent*/</span>
    211. 

  211. <a name="l00179"></a>00179 <span class="keywordtype">void</span> *uip_sappdata;
    212. 

  212. <a name="l00180"></a>00180 
    213. 

  213. <a name="l00181"></a>00181 <span class="preprocessor">#if UIP_URGDATA &gt; 0</span>
    214. 

  214. <a name="l00182"></a>00182 <span class="preprocessor"></span><span class="comment">/* The uip_urgdata pointer points to urgent data (out-of-band data), if present */</span>
    215. 

  215. <a name="l00183"></a>00183 <span class="keywordtype">void</span> *uip_urgdata;
    216. 

  216. <a name="l00184"></a>00184 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> uip_urglen, uip_surglen;
    217. 

  217. <a name="l00185"></a>00185 <span class="preprocessor">#endif </span><span class="comment">/* UIP_URGDATA &gt; 0 */</span>
    218. 

  218. <a name="l00186"></a>00186 
    219. 

  219. <a name="l00187"></a>00187 <span class="comment">/* The uip_len is either 8 or 16 bits, depending on the maximum packet size.*/</span>
    220. 

  220. <a name="l00188"></a><a class="code" href="a01685.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1">00188</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;<span class="comment"></span>
    221. 

  221. <a name="l00189"></a>00189 <span class="comment">/** @} */</span>
    222. 

  222. <a name="l00190"></a>00190 
    223. 

  223. <a name="l00191"></a>00191 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
    224. 

  224. <a name="l00192"></a>00192 <span class="comment">/** @{ \name General variables                                               */</span>
    225. 

  225. <a name="l00193"></a>00193 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    226. 

  226. <a name="l00194"></a>00194 
    227. 

  227. <a name="l00195"></a>00195 <span class="comment">/* The uip_flags variable is used for communication between the TCP/IP stack</span>
    228. 

  228. <a name="l00196"></a>00196 <span class="comment">and the application program. */</span>
    229. 

  229. <a name="l00197"></a>00197 <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> uip_flags;
    230. 

  230. <a name="l00198"></a>00198 
    231. 

  231. <a name="l00199"></a>00199 <span class="comment">/* uip_conn always points to the current connection (set to NULL for UDP). */</span>
    232. 

  232. <a name="l00200"></a><a class="code" href="a01685.html#ga788ffac72342f6172343d7f8099cbe1a">00200</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>;
    233. 

  233. <a name="l00201"></a>00201 
    234. 

  234. <a name="l00202"></a>00202 <span class="comment">/* Temporary variables. */</span>
    235. 

  235. <a name="l00203"></a>00203 <span class="preprocessor">#if (UIP_TCP || UIP_UDP)</span>
    236. 

  236. <a name="l00204"></a>00204 <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> c;
    237. 

  237. <a name="l00205"></a>00205 <span class="preprocessor">#endif</span>
    238. 

  238. <a name="l00206"></a>00206 <span class="preprocessor"></span>
    239. 

  239. <a name="l00207"></a>00207 <span class="preprocessor">#if UIP_ACTIVE_OPEN || UIP_UDP</span>
    240. 

  240. <a name="l00208"></a>00208 <span class="preprocessor"></span><span class="comment">/* Keeps track of the last port used for a new connection. */</span>
    241. 

  241. <a name="l00209"></a>00209 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> lastport;
    242. 

  242. <a name="l00210"></a>00210 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN || UIP_UDP */</span>
    243. 

  243. <a name="l00211"></a>00211 <span class="comment">/** @} */</span>
    244. 

  244. <a name="l00212"></a>00212 
    245. 

  245. <a name="l00213"></a>00213 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    246. 

  246. <a name="l00214"></a>00214 <span class="comment">/* TCP                                                                       */</span>
    247. 

  247. <a name="l00215"></a>00215 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
    248. 

  248. <a name="l00216"></a>00216 <span class="comment">/** \name TCP defines</span>
    249. 

  249. <a name="l00217"></a>00217 <span class="comment"> *@{</span>
    250. 

  250. <a name="l00218"></a>00218 <span class="comment"> */</span>
    251. 

  251. <a name="l00219"></a>00219 <span class="comment">/* Structures and definitions. */</span>
    252. 

  252. <a name="l00220"></a>00220 <span class="preprocessor">#define TCP_FIN 0x01</span>
    253. 

  253. <a name="l00221"></a>00221 <span class="preprocessor"></span><span class="preprocessor">#define TCP_SYN 0x02</span>
    254. 

  254. <a name="l00222"></a>00222 <span class="preprocessor"></span><span class="preprocessor">#define TCP_RST 0x04</span>
    255. 

  255. <a name="l00223"></a>00223 <span class="preprocessor"></span><span class="preprocessor">#define TCP_PSH 0x08</span>
    256. 

  256. <a name="l00224"></a>00224 <span class="preprocessor"></span><span class="preprocessor">#define TCP_ACK 0x10</span>
    257. 

  257. <a name="l00225"></a>00225 <span class="preprocessor"></span><span class="preprocessor">#define TCP_URG 0x20</span>
    258. 

  258. <a name="l00226"></a>00226 <span class="preprocessor"></span><span class="preprocessor">#define TCP_CTL 0x3f</span>
    259. 

  259. <a name="l00227"></a>00227 <span class="preprocessor"></span>
    260. 

  260. <a name="l00228"></a>00228 <span class="preprocessor">#define TCP_OPT_END     0   </span><span class="comment">/* End of TCP options list */</span>
    261. 

  261. <a name="l00229"></a>00229 <span class="preprocessor">#define TCP_OPT_NOOP    1   </span><span class="comment">/* &quot;No-operation&quot; TCP option */</span>
    262. 

  262. <a name="l00230"></a>00230 <span class="preprocessor">#define TCP_OPT_MSS     2   </span><span class="comment">/* Maximum segment size TCP option */</span>
    263. 

  263. <a name="l00231"></a>00231 
    264. 

  264. <a name="l00232"></a>00232 <span class="preprocessor">#define TCP_OPT_MSS_LEN 4   </span><span class="comment">/* Length of TCP MSS option. */</span>
    265. 

  265. <a name="l00233"></a>00233 <span class="comment">/** @} */</span><span class="comment"></span>
    266. 

  266. <a name="l00234"></a>00234 <span class="comment">/** \name TCP variables</span>
    267. 

  267. <a name="l00235"></a>00235 <span class="comment"> *@{</span>
    268. 

  268. <a name="l00236"></a>00236 <span class="comment"> */</span>
    269. 

  269. <a name="l00237"></a>00237 <span class="preprocessor">#if UIP_TCP</span>
    270. 

  270. <a name="l00238"></a>00238 <span class="preprocessor"></span><span class="comment">/* The uip_conns array holds all TCP connections. */</span>
    271. 

  271. <a name="l00239"></a>00239 <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>];
    272. 

  272. <a name="l00240"></a>00240 
    273. 

  273. <a name="l00241"></a>00241 <span class="comment">/* The uip_listenports list all currently listning ports. */</span>
    274. 

  274. <a name="l00242"></a>00242 <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>];
    275. 

  275. <a name="l00243"></a>00243 
    276. 

  276. <a name="l00244"></a>00244 <span class="comment">/* The iss variable is used for the TCP initial sequence number. */</span>
    277. 

  277. <a name="l00245"></a>00245 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> iss[4];
    278. 

  278. <a name="l00246"></a>00246 
    279. 

  279. <a name="l00247"></a>00247 <span class="comment">/* Temporary variables. */</span>
    280. 

  280. <a name="l00248"></a>00248 <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];
    281. 

  281. <a name="l00249"></a>00249 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> opt;
    282. 

  282. <a name="l00250"></a>00250 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> tmp16;
    283. 

  283. <a name="l00251"></a>00251 <span class="preprocessor">#endif </span><span class="comment">/* UIP_TCP */</span>
    284. 

  284. <a name="l00252"></a>00252 <span class="comment">/** @} */</span>
    285. 

  285. <a name="l00253"></a>00253 
    286. 

  286. <a name="l00254"></a>00254 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
    287. 

  287. <a name="l00255"></a>00255 <span class="comment">/** @{ \name UDP variables                                                   */</span>
    288. 

  288. <a name="l00256"></a>00256 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    289. 

  289. <a name="l00257"></a>00257 <span class="preprocessor">#if UIP_UDP</span>
    290. 

  290. <a name="l00258"></a><a class="code" href="a01685.html#ga210f227119fc972e6222c9cb452e15a9">00258</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>;
    291. 

  291. <a name="l00259"></a>00259 <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>];
    292. 

  292. <a name="l00260"></a>00260 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
    293. 

  293. <a name="l00261"></a>00261 <span class="comment">/** @} */</span>
    294. 

  294. <a name="l00262"></a>00262 
    295. 

  295. <a name="l00263"></a>00263 <span class="comment">/*---------------------------------------------------------------------------*/</span><span class="comment"></span>
    296. 

  296. <a name="l00264"></a>00264 <span class="comment">/** @{ \name ICMPv6 variables                                                */</span>
    297. 

  297. <a name="l00265"></a>00265 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    298. 

  298. <a name="l00266"></a>00266 <span class="preprocessor">#if UIP_CONF_ICMP6</span>
    299. 

  299. <a name="l00267"></a>00267 <span class="preprocessor"></span><span class="comment">/** single possible icmpv6 &quot;connection&quot; */</span>
    300. 

  300. <a name="l00268"></a>00268 <span class="keyword">struct </span>uip_icmp6_conn uip_icmp6_conns;
    301. 

  301. <a name="l00269"></a>00269 <span class="preprocessor">#endif </span><span class="comment">/*UIP_CONF_ICMP6*/</span>
    302. 

  302. <a name="l00270"></a>00270 <span class="comment">/** @} */</span>
    303. 

  303. <a name="l00271"></a>00271 
    304. 

  304. <a name="l00272"></a>00272 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    305. 

  305. <a name="l00273"></a>00273 <span class="comment">/* Functions                                                                 */</span>
    306. 

  306. <a name="l00274"></a>00274 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    307. 

  307. <a name="l00275"></a>00275 <span class="preprocessor">#if (!UIP_ARCH_ADD32 &amp;&amp; UIP_TCP)</span>
    308. 

  308. <a name="l00276"></a>00276 <span class="preprocessor"></span><span class="keywordtype">void</span>
    309. 

  309. <a name="l00277"></a>00277 <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)
    310. 

  310. <a name="l00278"></a>00278 {
    311. 

  311. <a name="l00279"></a>00279   <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 &amp; 0xff);
    312. 

  312. <a name="l00280"></a>00280   <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 &gt;&gt; 8);
    313. 

  313. <a name="l00281"></a>00281   uip_acc32[1] = op32[1];
    314. 

  314. <a name="l00282"></a>00282   uip_acc32[0] = op32[0];
    315. 

  315. <a name="l00283"></a>00283   
    316. 

  316. <a name="l00284"></a>00284   <span class="keywordflow">if</span>(uip_acc32[2] &lt; (op16 &gt;&gt; 8)) {
    317. 

  317. <a name="l00285"></a>00285     ++uip_acc32[1];
    318. 

  318. <a name="l00286"></a>00286     <span class="keywordflow">if</span>(uip_acc32[1] == 0) {
    319. 

  319. <a name="l00287"></a>00287       ++uip_acc32[0];
    320. 

  320. <a name="l00288"></a>00288     }
    321. 

  321. <a name="l00289"></a>00289   }
    322. 

  322. <a name="l00290"></a>00290   
    323. 

  323. <a name="l00291"></a>00291   
    324. 

  324. <a name="l00292"></a>00292   <span class="keywordflow">if</span>(uip_acc32[3] &lt; (op16 &amp; 0xff)) {
    325. 

  325. <a name="l00293"></a>00293     ++uip_acc32[2];
    326. 

  326. <a name="l00294"></a>00294     <span class="keywordflow">if</span>(uip_acc32[2] == 0) {
    327. 

  327. <a name="l00295"></a>00295       ++uip_acc32[1];
    328. 

  328. <a name="l00296"></a>00296       <span class="keywordflow">if</span>(uip_acc32[1] == 0) {
    329. 

  329. <a name="l00297"></a>00297         ++uip_acc32[0];
    330. 

  330. <a name="l00298"></a>00298       }
    331. 

  331. <a name="l00299"></a>00299     }
    332. 

  332. <a name="l00300"></a>00300   }
    333. 

  333. <a name="l00301"></a>00301 }
    334. 

  334. <a name="l00302"></a>00302 
    335. 

  335. <a name="l00303"></a>00303 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ARCH_ADD32 &amp;&amp; UIP_TCP */</span>
    336. 

  336. <a name="l00304"></a>00304 
    337. 

  337. <a name="l00305"></a>00305 <span class="preprocessor">#if ! UIP_ARCH_CHKSUM</span>
    338. 

  338. <a name="l00306"></a>00306 <span class="preprocessor"></span><span class="comment">/*---------------------------------------------------------------------------*/</span>
    339. 

  339. <a name="l00307"></a>00307 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
    340. 

  340. <a name="l00308"></a>00308 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)
    341. 

  341. <a name="l00309"></a>00309 {
    342. 

  342. <a name="l00310"></a>00310   <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> t;
    343. 

  343. <a name="l00311"></a>00311   <span class="keyword">const</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *dataptr;
    344. 

  344. <a name="l00312"></a>00312   <span class="keyword">const</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *last_byte;
    345. 

  345. <a name="l00313"></a>00313 
    346. 

  346. <a name="l00314"></a>00314   dataptr = data;
    347. 

  347. <a name="l00315"></a>00315   last_byte = data + len - 1;
    348. 

  348. <a name="l00316"></a>00316   
    349. 

  349. <a name="l00317"></a>00317   <span class="keywordflow">while</span>(dataptr &lt; last_byte) {   <span class="comment">/* At least two more bytes */</span>
    350. 

  350. <a name="l00318"></a>00318     t = (dataptr[0] &lt;&lt; 8) + dataptr[1];
    351. 

  351. <a name="l00319"></a>00319     sum += t;
    352. 

  352. <a name="l00320"></a>00320     <span class="keywordflow">if</span>(sum &lt; t) {
    353. 

  353. <a name="l00321"></a>00321       sum++;      <span class="comment">/* carry */</span>
    354. 

  354. <a name="l00322"></a>00322     }
    355. 

  355. <a name="l00323"></a>00323     dataptr += 2;
    356. 

  356. <a name="l00324"></a>00324   }
    357. 

  357. <a name="l00325"></a>00325   
    358. 

  358. <a name="l00326"></a>00326   <span class="keywordflow">if</span>(dataptr == last_byte) {
    359. 

  359. <a name="l00327"></a>00327     t = (dataptr[0] &lt;&lt; 8) + 0;
    360. 

  360. <a name="l00328"></a>00328     sum += t;
    361. 

  361. <a name="l00329"></a>00329     <span class="keywordflow">if</span>(sum &lt; t) {
    362. 

  362. <a name="l00330"></a>00330       sum++;      <span class="comment">/* carry */</span>
    363. 

  363. <a name="l00331"></a>00331     }
    364. 

  364. <a name="l00332"></a>00332   }
    365. 

  365. <a name="l00333"></a>00333 
    366. 

  366. <a name="l00334"></a>00334   <span class="comment">/* Return sum in host byte order. */</span>
    367. 

  367. <a name="l00335"></a>00335   <span class="keywordflow">return</span> sum;
    368. 

  368. <a name="l00336"></a>00336 }
    369. 

  369. <a name="l00337"></a>00337 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    370. 

  370. <a name="l00338"></a>00338 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
    371. 

  371. <a name="l00339"></a><a class="code" href="a01578.html#gab6683dd83fe1c8de9a24086d4b69e907">00339</a> <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)
    372. 

  372. <a name="l00340"></a>00340 {
    373. 

  373. <a name="l00341"></a>00341   <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));
    374. 

  374. <a name="l00342"></a>00342 }
    375. 

  375. <a name="l00343"></a>00343 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    376. 

  376. <a name="l00344"></a>00344 <span class="preprocessor">#ifndef UIP_ARCH_IPCHKSUM</span>
    377. 

  377. <a name="l00345"></a>00345 <span class="preprocessor"></span><a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
    378. 

  378. <a name="l00346"></a><a class="code" href="a01578.html#ga2addf34c7d457c1a7899a7e2171ef1e9">00346</a> <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>)
    379. 

  379. <a name="l00347"></a>00347 {
    380. 

  380. <a name="l00348"></a>00348   <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> sum;
    381. 

  381. <a name="l00349"></a>00349 
    382. 

  382. <a name="l00350"></a>00350   sum = chksum(0, &amp;uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a>], UIP_IPH_LEN);
    383. 

  383. <a name="l00351"></a>00351   PRINTF(<span class="stringliteral">&quot;uip_ipchksum: sum 0x%04x\n&quot;</span>, sum);
    384. 

  384. <a name="l00352"></a>00352   <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);
    385. 

  385. <a name="l00353"></a>00353 }
    386. 

  386. <a name="l00354"></a>00354 <span class="preprocessor">#endif</span>
    387. 

  387. <a name="l00355"></a>00355 <span class="preprocessor"></span><span class="comment">/*---------------------------------------------------------------------------*/</span>
    388. 

  388. <a name="l00356"></a>00356 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
    389. 

  389. <a name="l00357"></a>00357 upper_layer_chksum(<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> proto)
    390. 

  390. <a name="l00358"></a>00358 {
    391. 

  391. <a name="l00359"></a>00359   <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> upper_layer_len;
    392. 

  392. <a name="l00360"></a>00360   <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> sum;
    393. 

  393. <a name="l00361"></a>00361   
    394. 

  394. <a name="l00362"></a>00362   upper_layer_len = (((<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>)(<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[0]) &lt;&lt; 8) + <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[1] - <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a>) ;
    395. 

  395. <a name="l00363"></a>00363   
    396. 

  396. <a name="l00364"></a>00364   <span class="comment">/* First sum pseudoheader. */</span>
    397. 

  397. <a name="l00365"></a>00365   <span class="comment">/* IP protocol and length fields. This addition cannot carry. */</span>
    398. 

  398. <a name="l00366"></a>00366   sum = upper_layer_len + proto;
    399. 

  399. <a name="l00367"></a>00367   <span class="comment">/* Sum IP source and destination addresses. */</span>
    400. 

  400. <a name="l00368"></a>00368   sum = chksum(sum, (<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *)&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;srcipaddr, 2 * <span class="keyword">sizeof</span>(<a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a>));
    401. 

  401. <a name="l00369"></a>00369 
    402. 

  402. <a name="l00370"></a>00370   <span class="comment">/* Sum TCP header and data. */</span>
    403. 

  403. <a name="l00371"></a>00371   sum = chksum(sum, &amp;uip_buf[UIP_IPH_LEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a>],
    404. 

  404. <a name="l00372"></a>00372                upper_layer_len);
    405. 

  405. <a name="l00373"></a>00373     
    406. 

  406. <a name="l00374"></a>00374   <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);
    407. 

  407. <a name="l00375"></a>00375 }
    408. 

  408. <a name="l00376"></a>00376 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    409. 

  409. <a name="l00377"></a>00377 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
    410. 

  410. <a name="l00378"></a><a class="code" href="a01685.html#ga5e6741b8bd3e0961fb87e3f85da27a7f">00378</a> <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>)
    411. 

  411. <a name="l00379"></a>00379 {
    412. 

  412. <a name="l00380"></a>00380   <span class="keywordflow">return</span> upper_layer_chksum(UIP_PROTO_ICMP6);
    413. 

  413. <a name="l00381"></a>00381   
    414. 

  414. <a name="l00382"></a>00382 }
    415. 

  415. <a name="l00383"></a>00383 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    416. 

  416. <a name="l00384"></a>00384 <span class="preprocessor">#if UIP_TCP</span>
    417. 

  417. <a name="l00385"></a>00385 <span class="preprocessor"></span><a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
    418. 

  418. <a name="l00386"></a>00386 <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>)
    419. 

  419. <a name="l00387"></a>00387 {
    420. 

  420. <a name="l00388"></a>00388   <span class="keywordflow">return</span> upper_layer_chksum(UIP_PROTO_TCP);
    421. 

  421. <a name="l00389"></a>00389 }
    422. 

  422. <a name="l00390"></a>00390 <span class="preprocessor">#endif </span><span class="comment">/* UIP_TCP */</span>
    423. 

  423. <a name="l00391"></a>00391 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    424. 

  424. <a name="l00392"></a>00392 <span class="preprocessor">#if UIP_UDP &amp;&amp; UIP_UDP_CHECKSUMS</span>
    425. 

  425. <a name="l00393"></a>00393 <span class="preprocessor"></span><a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
    426. 

  426. <a name="l00394"></a>00394 <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>)
    427. 

  427. <a name="l00395"></a>00395 {
    428. 

  428. <a name="l00396"></a>00396   <span class="keywordflow">return</span> upper_layer_chksum(UIP_PROTO_UDP);
    429. 

  429. <a name="l00397"></a>00397 }
    430. 

  430. <a name="l00398"></a>00398 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP &amp;&amp; UIP_UDP_CHECKSUMS */</span>
    431. 

  431. <a name="l00399"></a>00399 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ARCH_CHKSUM */</span>
    432. 

  432. <a name="l00400"></a>00400 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    433. 

  433. <a name="l00401"></a>00401 <span class="keywordtype">void</span>
    434. 

  434. <a name="l00402"></a><a class="code" href="a01685.html#gac48ed5f0d27721ef62a3ed02a5ad8d2e">00402</a> <a class="code" href="a01684.html#gac48ed5f0d27721ef62a3ed02a5ad8d2e" title="uIP initialization function.">uip_init</a>(<span class="keywordtype">void</span>)
    435. 

  435. <a name="l00403"></a>00403 {
    436. 

  436. <a name="l00404"></a>00404    
    437. 

  437. <a name="l00405"></a>00405   <a class="code" href="a01685.html#ga5527d94e75153109f16a3fb59491a7bb" title="Initialize data structures.">uip_ds6_init</a>();
    438. 

  438. <a name="l00406"></a>00406 
    439. 

  439. <a name="l00407"></a>00407 <span class="preprocessor">#if UIP_TCP</span>
    440. 

  440. <a name="l00408"></a>00408 <span class="preprocessor"></span>  <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a01585.html#ga8f4ebd8ef6c0ea665ed351d87fec09fd" title="The maximum number of simultaneously listening TCP ports.">UIP_LISTENPORTS</a>; ++c) {
    441. 

  441. <a name="l00409"></a>00409     uip_listenports[c] = 0;
    442. 

  442. <a name="l00410"></a>00410   }
    443. 

  443. <a name="l00411"></a>00411   <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a01585.html#gaf5fe83be78b78b9e7d9e7f1e34ab1cc5" title="The maximum number of simultaneously open TCP connections.">UIP_CONNS</a>; ++c) {
    444. 

  444. <a name="l00412"></a>00412     uip_conns[c].<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
    445. 

  445. <a name="l00413"></a>00413   }
    446. 

  446. <a name="l00414"></a>00414 <span class="preprocessor">#endif </span><span class="comment">/* UIP_TCP */</span>
    447. 

  447. <a name="l00415"></a>00415 
    448. 

  448. <a name="l00416"></a>00416 <span class="preprocessor">#if UIP_ACTIVE_OPEN || UIP_UDP</span>
    449. 

  449. <a name="l00417"></a>00417 <span class="preprocessor"></span>  lastport = 1024;
    450. 

  450. <a name="l00418"></a>00418 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN || UIP_UDP */</span>
    451. 

  451. <a name="l00419"></a>00419 
    452. 

  452. <a name="l00420"></a>00420 <span class="preprocessor">#if UIP_UDP</span>
    453. 

  453. <a name="l00421"></a>00421 <span class="preprocessor"></span>  <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a01584.html#ga196379ceb1219a99f4495e41ccc9bbfb" title="The maximum amount of concurrent UDP connections.">UIP_UDP_CONNS</a>; ++c) {
    454. 

  454. <a name="l00422"></a>00422     uip_udp_conns[c].<a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> = 0;
    455. 

  455. <a name="l00423"></a>00423   }
    456. 

  456. <a name="l00424"></a>00424 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
    457. 

  457. <a name="l00425"></a>00425 }
    458. 

  458. <a name="l00426"></a>00426 
    459. 

  459. <a name="l00427"></a>00427 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    460. 

  460. <a name="l00428"></a>00428 <span class="preprocessor">#if UIP_TCP &amp;&amp; UIP_ACTIVE_OPEN</span>
    461. 

  461. <a name="l00429"></a>00429 <span class="preprocessor"></span><span class="keyword">struct </span>uip_conn *
    462. 

  462. <a name="l00430"></a>00430 <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>)
    463. 

  463. <a name="l00431"></a>00431 {
    464. 

  464. <a name="l00432"></a>00432   <span class="keyword">register</span> <span class="keyword">struct </span>uip_conn *conn, *cconn;
    465. 

  465. <a name="l00433"></a>00433   
    466. 

  466. <a name="l00434"></a>00434   <span class="comment">/* Find an unused local port. */</span>
    467. 

  467. <a name="l00435"></a>00435  again:
    468. 

  468. <a name="l00436"></a>00436   ++lastport;
    469. 

  469. <a name="l00437"></a>00437 
    470. 

  470. <a name="l00438"></a>00438   <span class="keywordflow">if</span>(lastport &gt;= 32000) {
    471. 

  471. <a name="l00439"></a>00439     lastport = 4096;
    472. 

  472. <a name="l00440"></a>00440   }
    473. 

  473. <a name="l00441"></a>00441 
    474. 

  474. <a name="l00442"></a>00442   <span class="comment">/* Check if this port is already in use, and if so try to find</span>
    475. 

  475. <a name="l00443"></a>00443 <span class="comment">     another one. */</span>
    476. 

  476. <a name="l00444"></a>00444   <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a01585.html#gaf5fe83be78b78b9e7d9e7f1e34ab1cc5" title="The maximum number of simultaneously open TCP connections.">UIP_CONNS</a>; ++c) {
    477. 

  477. <a name="l00445"></a>00445     conn = &amp;uip_conns[c];
    478. 

  478. <a name="l00446"></a>00446     <span class="keywordflow">if</span>(conn-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> != UIP_CLOSED &amp;&amp;
    479. 

  479. <a name="l00447"></a>00447        conn-&gt;<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)) {
    480. 

  480. <a name="l00448"></a>00448       <span class="keywordflow">goto</span> again;
    481. 

  481. <a name="l00449"></a>00449     }
    482. 

  482. <a name="l00450"></a>00450   }
    483. 

  483. <a name="l00451"></a>00451 
    484. 

  484. <a name="l00452"></a>00452   conn = 0;
    485. 

  485. <a name="l00453"></a>00453   <span class="keywordflow">for</span>(c = 0; c &lt; UIP_CONNS; ++c) {
    486. 

  486. <a name="l00454"></a>00454     cconn = &amp;uip_conns[c];
    487. 

  487. <a name="l00455"></a>00455     <span class="keywordflow">if</span>(cconn-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_CLOSED) {
    488. 

  488. <a name="l00456"></a>00456       conn = cconn;
    489. 

  489. <a name="l00457"></a>00457       <span class="keywordflow">break</span>;
    490. 

  490. <a name="l00458"></a>00458     }
    491. 

  491. <a name="l00459"></a>00459     <span class="keywordflow">if</span>(cconn-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_TIME_WAIT) {
    492. 

  492. <a name="l00460"></a>00460       <span class="keywordflow">if</span>(conn == 0 ||
    493. 

  493. <a name="l00461"></a>00461          cconn-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> &gt; conn-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a>) {
    494. 

  494. <a name="l00462"></a>00462         conn = cconn;
    495. 

  495. <a name="l00463"></a>00463       }
    496. 

  496. <a name="l00464"></a>00464     }
    497. 

  497. <a name="l00465"></a>00465   }
    498. 

  498. <a name="l00466"></a>00466 
    499. 

  499. <a name="l00467"></a>00467   <span class="keywordflow">if</span>(conn == 0) {
    500. 

  500. <a name="l00468"></a>00468     <span class="keywordflow">return</span> 0;
    501. 

  501. <a name="l00469"></a>00469   }
    502. 

  502. <a name="l00470"></a>00470   
    503. 

  503. <a name="l00471"></a>00471   conn-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_SYN_SENT;
    504. 

  504. <a name="l00472"></a>00472 
    505. 

  505. <a name="l00473"></a>00473   conn-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[0] = iss[0];
    506. 

  506. <a name="l00474"></a>00474   conn-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[1] = iss[1];
    507. 

  507. <a name="l00475"></a>00475   conn-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[2] = iss[2];
    508. 

  508. <a name="l00476"></a>00476   conn-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[3] = iss[3];
    509. 

  509. <a name="l00477"></a>00477 
    510. 

  510. <a name="l00478"></a>00478   conn-&gt;<a class="code" href="a00092.html#adb7a3fadb68df5fdd37e8b91a2c751ea" title="Initial maximum segment size for the connection.">initialmss</a> = conn-&gt;<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>;
    511. 

  511. <a name="l00479"></a>00479   
    512. 

  512. <a name="l00480"></a>00480   conn-&gt;<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>
    513. 

  513. <a name="l00481"></a>00481   conn-&gt;<a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> = 0;
    514. 

  514. <a name="l00482"></a>00482   conn-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = 1; <span class="comment">/* Send the SYN next time around. */</span>
    515. 

  515. <a name="l00483"></a>00483   conn-&gt;<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>;
    516. 

  516. <a name="l00484"></a>00484   conn-&gt;<a class="code" href="a00092.html#aef661afb3aa82f0437d2ed8d3c20be76" title="Retransmission time-out calculation state variable.">sa</a> = 0;
    517. 

  517. <a name="l00485"></a>00485   conn-&gt;<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>
    518. 

  518. <a name="l00486"></a>00486   conn-&gt;<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);
    519. 

  519. <a name="l00487"></a>00487   conn-&gt;<a class="code" href="a00092.html#a1df6aa054ef2fa634ac4c6f418228285" title="The local remote TCP port, in network byte order.">rport</a> = rport;
    520. 

  520. <a name="l00488"></a>00488   <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&amp;conn-&gt;<a class="code" href="a00092.html#a79510aa86d3fa0a0fc6cfc49b1da7279" title="The IP address of the remote host.">ripaddr</a>, ripaddr);
    521. 

  521. <a name="l00489"></a>00489   
    522. 

  522. <a name="l00490"></a>00490   <span class="keywordflow">return</span> conn;
    523. 

  523. <a name="l00491"></a>00491 }
    524. 

  524. <a name="l00492"></a>00492 <span class="preprocessor">#endif </span><span class="comment">/* UIP_TCP &amp;&amp; UIP_ACTIVE_OPEN */</span>
    525. 

  525. <a name="l00493"></a>00493 
    526. 

  526. <a name="l00494"></a>00494 
    527. 

  527. <a name="l00495"></a>00495 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    528. 

  528. <a name="l00496"></a>00496 <span class="preprocessor">#if UIP_UDP</span>
    529. 

  529. <a name="l00497"></a>00497 <span class="preprocessor"></span><span class="keyword">struct </span>uip_udp_conn *
    530. 

  530. <a name="l00498"></a><a class="code" href="a01685.html#ga5703bad3c0154b02715260ddf6b612a2">00498</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)
    531. 

  531. <a name="l00499"></a>00499 {
    532. 

  532. <a name="l00500"></a>00500   <span class="keyword">register</span> <span class="keyword">struct </span>uip_udp_conn *conn;
    533. 

  533. <a name="l00501"></a>00501   
    534. 

  534. <a name="l00502"></a>00502   <span class="comment">/* Find an unused local port. */</span>
    535. 

  535. <a name="l00503"></a>00503  again:
    536. 

  536. <a name="l00504"></a>00504   ++lastport;
    537. 

  537. <a name="l00505"></a>00505 
    538. 

  538. <a name="l00506"></a>00506   <span class="keywordflow">if</span>(lastport &gt;= 32000) {
    539. 

  539. <a name="l00507"></a>00507     lastport = 4096;
    540. 

  540. <a name="l00508"></a>00508   }
    541. 

  541. <a name="l00509"></a>00509   
    542. 

  542. <a name="l00510"></a>00510   <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a01584.html#ga196379ceb1219a99f4495e41ccc9bbfb" title="The maximum amount of concurrent UDP connections.">UIP_UDP_CONNS</a>; ++c) {
    543. 

  543. <a name="l00511"></a>00511     <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)) {
    544. 

  544. <a name="l00512"></a>00512       <span class="keywordflow">goto</span> again;
    545. 

  545. <a name="l00513"></a>00513     }
    546. 

  546. <a name="l00514"></a>00514   }
    547. 

  547. <a name="l00515"></a>00515 
    548. 

  548. <a name="l00516"></a>00516 
    549. 

  549. <a name="l00517"></a>00517   conn = 0;
    550. 

  550. <a name="l00518"></a>00518   <span class="keywordflow">for</span>(c = 0; c &lt; UIP_UDP_CONNS; ++c) {
    551. 

  551. <a name="l00519"></a>00519     <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) {
    552. 

  552. <a name="l00520"></a>00520       conn = &amp;uip_udp_conns[c];
    553. 

  553. <a name="l00521"></a>00521       <span class="keywordflow">break</span>;
    554. 

  554. <a name="l00522"></a>00522     }
    555. 

  555. <a name="l00523"></a>00523   }
    556. 

  556. <a name="l00524"></a>00524 
    557. 

  557. <a name="l00525"></a>00525   <span class="keywordflow">if</span>(conn == 0) {
    558. 

  558. <a name="l00526"></a>00526     <span class="keywordflow">return</span> 0;
    559. 

  559. <a name="l00527"></a>00527   }
    560. 

  560. <a name="l00528"></a>00528   
    561. 

  561. <a name="l00529"></a>00529   conn-&gt;<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);
    562. 

  562. <a name="l00530"></a>00530   conn-&gt;<a class="code" href="a00119.html#a280a0c2a93544e597f92bbacf36ee1dc" title="The remote port number in network byte order.">rport</a> = rport;
    563. 

  563. <a name="l00531"></a>00531   <span class="keywordflow">if</span>(ripaddr == NULL) {
    564. 

  564. <a name="l00532"></a>00532     memset(&amp;conn-&gt;<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>));
    565. 

  565. <a name="l00533"></a>00533   } <span class="keywordflow">else</span> {
    566. 

  566. <a name="l00534"></a>00534     <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&amp;conn-&gt;<a class="code" href="a00119.html#a8a661a2d544100b82d0d14a1985083d5" title="The IP address of the remote peer.">ripaddr</a>, ripaddr);
    567. 

  567. <a name="l00535"></a>00535   }
    568. 

  568. <a name="l00536"></a>00536   conn-&gt;<a class="code" href="a00119.html#a4da1d7815516cd2b5bda3a66fdf05198" title="Default time-to-live.">ttl</a> = <a class="code" href="a01685.html#gaecc8ec9970a01951fd9eec36e07884ef">uip_ds6_if</a>.cur_hop_limit;
    569. 

  569. <a name="l00537"></a>00537   
    570. 

  570. <a name="l00538"></a>00538   <span class="keywordflow">return</span> conn;
    571. 

  571. <a name="l00539"></a>00539 }
    572. 

  572. <a name="l00540"></a>00540 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
    573. 

  573. <a name="l00541"></a>00541 
    574. 

  574. <a name="l00542"></a>00542 
    575. 

  575. <a name="l00543"></a>00543 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    576. 

  576. <a name="l00544"></a>00544 <span class="preprocessor">#if UIP_TCP</span>
    577. 

  577. <a name="l00545"></a>00545 <span class="preprocessor"></span><span class="keywordtype">void</span>
    578. 

  578. <a name="l00546"></a>00546 <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)
    579. 

  579. <a name="l00547"></a>00547 {
    580. 

  580. <a name="l00548"></a>00548   <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a01585.html#ga8f4ebd8ef6c0ea665ed351d87fec09fd" title="The maximum number of simultaneously listening TCP ports.">UIP_LISTENPORTS</a>; ++c) {
    581. 

  581. <a name="l00549"></a>00549     <span class="keywordflow">if</span>(uip_listenports[c] == port) {
    582. 

  582. <a name="l00550"></a>00550       uip_listenports[c] = 0;
    583. 

  583. <a name="l00551"></a>00551       <span class="keywordflow">return</span>;
    584. 

  584. <a name="l00552"></a>00552     }
    585. 

  585. <a name="l00553"></a>00553   }
    586. 

  586. <a name="l00554"></a>00554 }
    587. 

  587. <a name="l00555"></a>00555 
    588. 

  588. <a name="l00556"></a>00556 
    589. 

  589. <a name="l00557"></a>00557 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    590. 

  590. <a name="l00558"></a>00558 <span class="keywordtype">void</span>
    591. 

  591. <a name="l00559"></a>00559 <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)
    592. 

  592. <a name="l00560"></a>00560 {
    593. 

  593. <a name="l00561"></a>00561   <span class="keywordflow">for</span>(c = 0; c &lt; UIP_LISTENPORTS; ++c) {
    594. 

  594. <a name="l00562"></a>00562     <span class="keywordflow">if</span>(uip_listenports[c] == 0) {
    595. 

  595. <a name="l00563"></a>00563       uip_listenports[c] = port;
    596. 

  596. <a name="l00564"></a>00564       <span class="keywordflow">return</span>;
    597. 

  597. <a name="l00565"></a>00565     }
    598. 

  598. <a name="l00566"></a>00566   }
    599. 

  599. <a name="l00567"></a>00567 }
    600. 

  600. <a name="l00568"></a>00568 <span class="preprocessor">#endif</span>
    601. 

  601. <a name="l00569"></a>00569 <span class="preprocessor"></span><span class="comment">/*---------------------------------------------------------------------------*/</span>
    602. 

  602. <a name="l00570"></a>00570 
    603. 

  603. <a name="l00571"></a>00571 
    604. 

  604. <a name="l00572"></a>00572 <span class="preprocessor">#if UIP_CONF_IPV6_REASSEMBLY</span>
    605. 

  605. <a name="l00573"></a>00573 <span class="preprocessor"></span><span class="preprocessor">#define UIP_REASS_BUFSIZE (UIP_BUFSIZE - UIP_LLH_LEN)</span>
    606. 

  606. <a name="l00574"></a>00574 <span class="preprocessor"></span>
    607. 

  607. <a name="l00575"></a>00575 <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];
    608. 

  608. <a name="l00576"></a>00576 
    609. 

  609. <a name="l00577"></a>00577 <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)];
    610. 

  610. <a name="l00578"></a>00578 <span class="comment">/*the first byte of an IP fragment is aligned on an 8-byte boundary */</span>
    611. 

  611. <a name="l00579"></a>00579 
    612. 

  612. <a name="l00580"></a>00580 <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,
    613. 

  613. <a name="l00581"></a>00581                                     0x0f, 0x07, 0x03, 0x01};
    614. 

  614. <a name="l00582"></a>00582 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> uip_reasslen;
    615. 

  615. <a name="l00583"></a>00583 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> uip_reassflags;
    616. 

  616. <a name="l00584"></a>00584 
    617. 

  617. <a name="l00585"></a>00585 <span class="preprocessor">#define UIP_REASS_FLAG_LASTFRAG 0x01</span>
    618. 

  618. <a name="l00586"></a>00586 <span class="preprocessor"></span><span class="preprocessor">#define UIP_REASS_FLAG_FIRSTFRAG 0x02</span>
    619. 

  619. <a name="l00587"></a>00587 <span class="preprocessor"></span><span class="preprocessor">#define UIP_REASS_FLAG_ERROR_MSG 0x04</span>
    620. 

  620. <a name="l00588"></a>00588 <span class="preprocessor"></span>
    621. 

  621. <a name="l00589"></a>00589 
    622. 

  622. <a name="l00590"></a>00590 <span class="comment">/*</span>
    623. 

  623. <a name="l00591"></a>00591 <span class="comment"> * See RFC 2460 for a description of fragmentation in IPv6</span>
    624. 

  624. <a name="l00592"></a>00592 <span class="comment"> * A typical Ipv6 fragment</span>
    625. 

  625. <a name="l00593"></a>00593 <span class="comment"> *  +------------------+--------+--------------+</span>
    626. 

  626. <a name="l00594"></a>00594 <span class="comment"> *  |  Unfragmentable  |Fragment|    first     |</span>
    627. 

  627. <a name="l00595"></a>00595 <span class="comment"> *  |       Part       | Header |   fragment   |</span>
    628. 

  628. <a name="l00596"></a>00596 <span class="comment"> *  +------------------+--------+--------------+</span>
    629. 

  629. <a name="l00597"></a>00597 <span class="comment"> */</span>
    630. 

  630. <a name="l00598"></a>00598 
    631. 

  631. <a name="l00599"></a>00599 
    632. 

  632. <a name="l00600"></a>00600 <span class="keyword">struct </span><a class="code" href="a00042.html" title="A timer.">etimer</a> uip_reass_timer; <span class="comment">/* timer for reassembly */</span>
    633. 

  633. <a name="l00601"></a>00601 <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> uip_reass_on; <span class="comment">/* equal to 1 if we are currently reassembling a packet */</span>
    634. 

  634. <a name="l00602"></a>00602 
    635. 

  635. <a name="l00603"></a>00603 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4c14294869aceba3ef9d4c0c302d0f33" title="The 32-bit unsigned data type.">u32_t</a> uip_id; <span class="comment">/* For every packet that is to be fragmented, the source</span>
    636. 

  636. <a name="l00604"></a>00604 <span class="comment">                        node generates an Identification value that is present</span>
    637. 

  637. <a name="l00605"></a>00605 <span class="comment">                        in all the fragments */</span>
    638. 

  638. <a name="l00606"></a>00606 <span class="preprocessor">#define IP_MF   0x0001</span>
    639. 

  639. <a name="l00607"></a>00607 <span class="preprocessor"></span>
    640. 

  640. <a name="l00608"></a>00608 <span class="keyword">static</span> <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
    641. 

  641. <a name="l00609"></a>00609 uip_reass(<span class="keywordtype">void</span>)
    642. 

  642. <a name="l00610"></a>00610 {
    643. 

  643. <a name="l00611"></a>00611   <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> offset=0;
    644. 

  644. <a name="l00612"></a>00612   <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> len;
    645. 

  645. <a name="l00613"></a>00613   <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> i;
    646. 

  646. <a name="l00614"></a>00614   
    647. 

  647. <a name="l00615"></a>00615   <span class="comment">/* If ip_reasstmr is zero, no packet is present in the buffer */</span>
    648. 

  648. <a name="l00616"></a>00616   <span class="comment">/* We first write the unfragmentable part of IP header into the reassembly</span>
    649. 

  649. <a name="l00617"></a>00617 <span class="comment">     buffer. The reset the other reassembly variables. */</span>
    650. 

  650. <a name="l00618"></a>00618   <span class="keywordflow">if</span>(uip_reass_on == 0) {
    651. 

  651. <a name="l00619"></a>00619     PRINTF(<span class="stringliteral">&quot;Starting reassembly\n&quot;</span>);
    652. 

  652. <a name="l00620"></a>00620     memcpy(FBUF, <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>, <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> + UIP_IPH_LEN);
    653. 

  653. <a name="l00621"></a>00621     <span class="comment">/* temporary in case we do not receive the fragment with offset 0 first */</span>
    654. 

  654. <a name="l00622"></a>00622     <a class="code" href="a01623.html#gadb6c83643bbca82b614c50b27c586302" title="Set an event timer.">etimer_set</a>(&amp;uip_reass_timer, <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 class="code" href="a01620.html#gae3ced0551b26c9b99cb45a86f34d100a" title="A second, measured in system clock time.">CLOCK_SECOND</a>);
    655. 

  655. <a name="l00623"></a>00623     uip_reass_on = 1;
    656. 

  656. <a name="l00624"></a>00624     uip_reassflags = 0;
    657. 

  657. <a name="l00625"></a>00625     uip_id = UIP_FRAG_BUF-&gt;id;
    658. 

  658. <a name="l00626"></a>00626     <span class="comment">/* Clear the bitmap. */</span>
    659. 

  659. <a name="l00627"></a>00627     memset(uip_reassbitmap, 0, <span class="keyword">sizeof</span>(uip_reassbitmap));
    660. 

  660. <a name="l00628"></a>00628   }
    661. 

  661. <a name="l00629"></a>00629   <span class="comment">/*</span>
    662. 

  662. <a name="l00630"></a>00630 <span class="comment">   * Check if the incoming fragment matches the one currently present</span>
    663. 

  663. <a name="l00631"></a>00631 <span class="comment">   * in the reasembly buffer. If so, we proceed with copying the fragment</span>
    664. 

  664. <a name="l00632"></a>00632 <span class="comment">   * into the buffer.</span>
    665. 

  665. <a name="l00633"></a>00633 <span class="comment">   */</span>
    666. 

  666. <a name="l00634"></a>00634   <span class="keywordflow">if</span>(<a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&amp;FBUF-&gt;srcipaddr, &amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;srcipaddr) &amp;&amp;
    667. 

  667. <a name="l00635"></a>00635      <a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&amp;FBUF-&gt;destipaddr, &amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr) &amp;&amp;
    668. 

  668. <a name="l00636"></a>00636      UIP_FRAG_BUF-&gt;id == uip_id) {
    669. 

  669. <a name="l00637"></a>00637     len = <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="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> - UIP_IPH_LEN - UIP_FRAGH_LEN;
    670. 

  670. <a name="l00638"></a>00638     offset = (uip_ntohs(UIP_FRAG_BUF-&gt;offsetresmore) &amp; 0xfff8);
    671. 

  671. <a name="l00639"></a>00639     <span class="comment">/* in byte, originaly in multiple of 8 bytes*/</span>
    672. 

  672. <a name="l00640"></a>00640     PRINTF(<span class="stringliteral">&quot;len %d\n&quot;</span>, len);
    673. 

  673. <a name="l00641"></a>00641     PRINTF(<span class="stringliteral">&quot;offset %d\n&quot;</span>, offset);
    674. 

  674. <a name="l00642"></a>00642     <span class="keywordflow">if</span>(offset == 0){
    675. 

  675. <a name="l00643"></a>00643       uip_reassflags |= UIP_REASS_FLAG_FIRSTFRAG;
    676. 

  676. <a name="l00644"></a>00644       <span class="comment">/*</span>
    677. 

  677. <a name="l00645"></a>00645 <span class="comment">       * The Next Header field of the last header of the Unfragmentable</span>
    678. 

  678. <a name="l00646"></a>00646 <span class="comment">       * Part is obtained from the Next Header field of the first</span>
    679. 

  679. <a name="l00647"></a>00647 <span class="comment">       * fragment&apos;s Fragment header.</span>
    680. 

  680. <a name="l00648"></a>00648 <span class="comment">       */</span>
    681. 

  681. <a name="l00649"></a>00649       *<a class="code" href="a01685.html#gaa605d238ba40e21d7200fe94d6abc46d" title="Type of the next header in IPv6 header or extension headers.">uip_next_hdr</a> = UIP_FRAG_BUF-&gt;next;
    682. 

  682. <a name="l00650"></a>00650       memcpy(FBUF, <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>, <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> + UIP_IPH_LEN);
    683. 

  683. <a name="l00651"></a>00651       PRINTF(<span class="stringliteral">&quot;src &quot;</span>);
    684. 

  684. <a name="l00652"></a>00652       PRINT6ADDR(&amp;FBUF-&gt;srcipaddr);
    685. 

  685. <a name="l00653"></a>00653       PRINTF(<span class="stringliteral">&quot;dest &quot;</span>);
    686. 

  686. <a name="l00654"></a>00654       PRINT6ADDR(&amp;FBUF-&gt;destipaddr);
    687. 

  687. <a name="l00655"></a>00655       PRINTF(<span class="stringliteral">&quot;next %d\n&quot;</span>, <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;proto);
    688. 

  688. <a name="l00656"></a>00656       
    689. 

  689. <a name="l00657"></a>00657     }
    690. 

  690. <a name="l00658"></a>00658     
    691. 

  691. <a name="l00659"></a>00659     <span class="comment">/* If the offset or the offset + fragment length overflows the</span>
    692. 

  692. <a name="l00660"></a>00660 <span class="comment">       reassembly buffer, we discard the entire packet. */</span>
    693. 

  693. <a name="l00661"></a>00661     <span class="keywordflow">if</span>(offset &gt; UIP_REASS_BUFSIZE ||
    694. 

  694. <a name="l00662"></a>00662        offset + len &gt; UIP_REASS_BUFSIZE) {
    695. 

  695. <a name="l00663"></a>00663       uip_reass_on = 0;
    696. 

  696. <a name="l00664"></a>00664       <a class="code" href="a01623.html#ga94628979920ab92a3cc0e69e537bef7d" title="Stop a pending event timer.">etimer_stop</a>(&amp;uip_reass_timer);
    697. 

  697. <a name="l00665"></a>00665       <span class="keywordflow">return</span> 0;
    698. 

  698. <a name="l00666"></a>00666     }
    699. 

  699. <a name="l00667"></a>00667 
    700. 

  700. <a name="l00668"></a>00668     <span class="comment">/* If this fragment has the More Fragments flag set to zero, it is the</span>
    701. 

  701. <a name="l00669"></a>00669 <span class="comment">       last fragment*/</span>
    702. 

  702. <a name="l00670"></a>00670     <span class="keywordflow">if</span>((uip_ntohs(UIP_FRAG_BUF-&gt;offsetresmore) &amp; IP_MF) == 0) {
    703. 

  703. <a name="l00671"></a>00671       uip_reassflags |= UIP_REASS_FLAG_LASTFRAG;
    704. 

  704. <a name="l00672"></a>00672       <span class="comment">/*calculate the size of the entire packet*/</span>
    705. 

  705. <a name="l00673"></a>00673       uip_reasslen = offset + len;
    706. 

  706. <a name="l00674"></a>00674       PRINTF(<span class="stringliteral">&quot;LAST FRAGMENT reasslen %d\n&quot;</span>, uip_reasslen);
    707. 

  707. <a name="l00675"></a>00675     } <span class="keywordflow">else</span> {
    708. 

  708. <a name="l00676"></a>00676       <span class="comment">/* If len is not a multiple of 8 octets and the M flag of that fragment</span>
    709. 

  709. <a name="l00677"></a>00677 <span class="comment">         is 1, then that fragment must be discarded and an ICMP Parameter</span>
    710. 

  710. <a name="l00678"></a>00678 <span class="comment">         Problem, Code 0, message should be sent to the source of the fragment,</span>
    711. 

  711. <a name="l00679"></a>00679 <span class="comment">         pointing to the Payload Length field of the fragment packet. */</span>
    712. 

  712. <a name="l00680"></a>00680       <span class="keywordflow">if</span>(len % 8 != 0){
    713. 

  713. <a name="l00681"></a>00681         <a class="code" href="a01685.html#ga4dea30e31d7780ea39872320f665fcb5" title="Send an icmpv6 error message.">uip_icmp6_error_output</a>(<a class="code" href="a01685.html#ga8d80ba426cf5f5d177e7464c8076b62a" title="ip6 header bad">ICMP6_PARAM_PROB</a>, <a class="code" href="a01685.html#gae1dd9cc2c5f466eeb157320e65faba79" title="erroneous header field">ICMP6_PARAMPROB_HEADER</a>, 4);
    714. 

  714. <a name="l00682"></a>00682         uip_reassflags |= UIP_REASS_FLAG_ERROR_MSG;
    715. 

  715. <a name="l00683"></a>00683         <span class="comment">/* not clear if we should interrupt reassembly, but it seems so from</span>
    716. 

  716. <a name="l00684"></a>00684 <span class="comment">           the conformance tests */</span>
    717. 

  717. <a name="l00685"></a>00685         uip_reass_on = 0;
    718. 

  718. <a name="l00686"></a>00686         <a class="code" href="a01623.html#ga94628979920ab92a3cc0e69e537bef7d" title="Stop a pending event timer.">etimer_stop</a>(&amp;uip_reass_timer);
    719. 

  719. <a name="l00687"></a>00687         <span class="keywordflow">return</span> <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>;
    720. 

  720. <a name="l00688"></a>00688       }
    721. 

  721. <a name="l00689"></a>00689     }
    722. 

  722. <a name="l00690"></a>00690     
    723. 

  723. <a name="l00691"></a>00691     <span class="comment">/* Copy the fragment into the reassembly buffer, at the right</span>
    724. 

  724. <a name="l00692"></a>00692 <span class="comment">       offset. */</span>
    725. 

  725. <a name="l00693"></a>00693     memcpy((uint8_t *)FBUF + UIP_IPH_LEN + <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> + offset,
    726. 

  726. <a name="l00694"></a>00694            (uint8_t *)UIP_FRAG_BUF + UIP_FRAGH_LEN, len);
    727. 

  727. <a name="l00695"></a>00695     
    728. 

  728. <a name="l00696"></a>00696     <span class="comment">/* Update the bitmap. */</span>
    729. 

  729. <a name="l00697"></a>00697     <span class="keywordflow">if</span>(offset &gt;&gt; 6 == (offset + len) &gt;&gt; 6) {
    730. 

  730. <a name="l00698"></a>00698       uip_reassbitmap[offset &gt;&gt; 6] |=
    731. 

  731. <a name="l00699"></a>00699         bitmap_bits[(offset &gt;&gt; 3) &amp; 7] &amp;
    732. 

  732. <a name="l00700"></a>00700         ~bitmap_bits[((offset + len) &gt;&gt; 3)  &amp; 7];
    733. 

  733. <a name="l00701"></a>00701     } <span class="keywordflow">else</span> {
    734. 

  734. <a name="l00702"></a>00702       <span class="comment">/* If the two endpoints are in different bytes, we update the</span>
    735. 

  735. <a name="l00703"></a>00703 <span class="comment">         bytes in the endpoints and fill the stuff inbetween with</span>
    736. 

  736. <a name="l00704"></a>00704 <span class="comment">         0xff. */</span>
    737. 

  737. <a name="l00705"></a>00705       uip_reassbitmap[offset &gt;&gt; 6] |= bitmap_bits[(offset &gt;&gt; 3) &amp; 7];
    738. 

  738. <a name="l00706"></a>00706  
    739. 

  739. <a name="l00707"></a>00707       <span class="keywordflow">for</span>(i = (1 + (offset &gt;&gt; 6)); i &lt; ((offset + len) &gt;&gt; 6); ++i) {
    740. 

  740. <a name="l00708"></a>00708         uip_reassbitmap[i] = 0xff;
    741. 

  741. <a name="l00709"></a>00709       }
    742. 

  742. <a name="l00710"></a>00710       uip_reassbitmap[(offset + len) &gt;&gt; 6] |=
    743. 

  743. <a name="l00711"></a>00711         ~bitmap_bits[((offset + len) &gt;&gt; 3) &amp; 7];
    744. 

  744. <a name="l00712"></a>00712     }
    745. 

  745. <a name="l00713"></a>00713   
    746. 

  746. <a name="l00714"></a>00714     <span class="comment">/* Finally, we check if we have a full packet in the buffer. We do</span>
    747. 

  747. <a name="l00715"></a>00715 <span class="comment">       this by checking if we have the last fragment and if all bits</span>
    748. 

  748. <a name="l00716"></a>00716 <span class="comment">       in the bitmap are set. */</span>
    749. 

  749. <a name="l00717"></a>00717     
    750. 

  750. <a name="l00718"></a>00718     <span class="keywordflow">if</span>(uip_reassflags &amp; UIP_REASS_FLAG_LASTFRAG) {
    751. 

  751. <a name="l00719"></a>00719       <span class="comment">/* Check all bytes up to and including all but the last byte in</span>
    752. 

  752. <a name="l00720"></a>00720 <span class="comment">         the bitmap. */</span>
    753. 

  753. <a name="l00721"></a>00721       <span class="keywordflow">for</span>(i = 0; i &lt; (uip_reasslen &gt;&gt; 6); ++i) {
    754. 

  754. <a name="l00722"></a>00722         <span class="keywordflow">if</span>(uip_reassbitmap[i] != 0xff) {
    755. 

  755. <a name="l00723"></a>00723           <span class="keywordflow">return</span> 0;
    756. 

  756. <a name="l00724"></a>00724         }
    757. 

  757. <a name="l00725"></a>00725       }
    758. 

  758. <a name="l00726"></a>00726       <span class="comment">/* Check the last byte in the bitmap. It should contain just the</span>
    759. 

  759. <a name="l00727"></a>00727 <span class="comment">         right amount of bits. */</span>
    760. 

  760. <a name="l00728"></a>00728       <span class="keywordflow">if</span>(uip_reassbitmap[uip_reasslen &gt;&gt; 6] !=
    761. 

  761. <a name="l00729"></a>00729          (<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a>)~bitmap_bits[(uip_reasslen &gt;&gt; 3) &amp; 7]) {
    762. 

  762. <a name="l00730"></a>00730         <span class="keywordflow">return</span> 0;
    763. 

  763. <a name="l00731"></a>00731       }
    764. 

  764. <a name="l00732"></a>00732 
    765. 

  765. <a name="l00733"></a>00733      <span class="comment">/* If we have come this far, we have a full packet in the</span>
    766. 

  766. <a name="l00734"></a>00734 <span class="comment">         buffer, so we copy it to uip_buf. We also reset the timer. */</span>
    767. 

  767. <a name="l00735"></a>00735       uip_reass_on = 0;
    768. 

  768. <a name="l00736"></a>00736       <a class="code" href="a01623.html#ga94628979920ab92a3cc0e69e537bef7d" title="Stop a pending event timer.">etimer_stop</a>(&amp;uip_reass_timer);
    769. 

  769. <a name="l00737"></a>00737 
    770. 

  770. <a name="l00738"></a>00738       uip_reasslen += UIP_IPH_LEN + <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a>;
    771. 

  771. <a name="l00739"></a>00739       memcpy(<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>, FBUF, uip_reasslen);
    772. 

  772. <a name="l00740"></a>00740       <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[0] = ((uip_reasslen - UIP_IPH_LEN) &gt;&gt; 8);
    773. 

  773. <a name="l00741"></a>00741       <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[1] = ((uip_reasslen - UIP_IPH_LEN) &amp; 0xff);
    774. 

  774. <a name="l00742"></a>00742       PRINTF(<span class="stringliteral">&quot;REASSEMBLED PAQUET %d (%d)\n&quot;</span>, uip_reasslen,
    775. 

  775. <a name="l00743"></a>00743              (<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[0] &lt;&lt; 8) | <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[1]);
    776. 

  776. <a name="l00744"></a>00744    
    777. 

  777. <a name="l00745"></a>00745       <span class="keywordflow">return</span> uip_reasslen;
    778. 

  778. <a name="l00746"></a>00746       
    779. 

  779. <a name="l00747"></a>00747     }
    780. 

  780. <a name="l00748"></a>00748   } <span class="keywordflow">else</span> {
    781. 

  781. <a name="l00749"></a>00749     PRINTF(<span class="stringliteral">&quot;Already reassembling another paquet\n&quot;</span>);
    782. 

  782. <a name="l00750"></a>00750   }
    783. 

  783. <a name="l00751"></a>00751   <span class="keywordflow">return</span> 0;
    784. 

  784. <a name="l00752"></a>00752 }
    785. 

  785. <a name="l00753"></a>00753 
    786. 

  786. <a name="l00754"></a>00754 <span class="keywordtype">void</span>
    787. 

  787. <a name="l00755"></a>00755 <a class="code" href="a01574.html#gaf8a01d734ce7c50dd9ef03b2a4e7a0ce" title="Abandon the reassembly of the current packet.">uip_reass_over</a>(<span class="keywordtype">void</span>)
    788. 

  788. <a name="l00756"></a>00756 {
    789. 

  789. <a name="l00757"></a>00757    <span class="comment">/* to late, we abandon the reassembly of the packet */</span>
    790. 

  790. <a name="l00758"></a>00758 
    791. 

  791. <a name="l00759"></a>00759   uip_reass_on = 0;
    792. 

  792. <a name="l00760"></a>00760   <a class="code" href="a01623.html#ga94628979920ab92a3cc0e69e537bef7d" title="Stop a pending event timer.">etimer_stop</a>(&amp;uip_reass_timer);
    793. 

  793. <a name="l00761"></a>00761 
    794. 

  794. <a name="l00762"></a>00762   <span class="keywordflow">if</span>(uip_reassflags &amp; UIP_REASS_FLAG_FIRSTFRAG){
    795. 

  795. <a name="l00763"></a>00763     PRINTF(<span class="stringliteral">&quot;FRAG INTERRUPTED TOO LATE\n&quot;</span>);
    796. 

  796. <a name="l00764"></a>00764     <span class="comment">/* If the first fragment has been received, an ICMP Time Exceeded</span>
    797. 

  797. <a name="l00765"></a>00765 <span class="comment">       -- Fragment Reassembly Time Exceeded message should be sent to the</span>
    798. 

  798. <a name="l00766"></a>00766 <span class="comment">       source of that fragment. */</span><span class="comment"></span>
    799. 

  799. <a name="l00767"></a>00767 <span class="comment">    /** \note</span>
    800. 

  800. <a name="l00768"></a>00768 <span class="comment">     * We don&apos;t have a complete packet to put in the error message.</span>
    801. 

  801. <a name="l00769"></a>00769 <span class="comment">     * We could include the first fragment but since its not mandated by</span>
    802. 

  802. <a name="l00770"></a>00770 <span class="comment">     * any RFC, we decided not to include it as it reduces the size of</span>
    803. 

  803. <a name="l00771"></a>00771 <span class="comment">     * the packet.</span>
    804. 

  804. <a name="l00772"></a>00772 <span class="comment">     */</span>
    805. 

  805. <a name="l00773"></a>00773     <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 0;
    806. 

  806. <a name="l00774"></a>00774     <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> = 0;
    807. 

  807. <a name="l00775"></a>00775     memcpy(<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>, FBUF, UIP_IPH_LEN); <span class="comment">/* copy the header for src</span>
    808. 

  808. <a name="l00776"></a>00776 <span class="comment">                                              and dest address*/</span>
    809. 

  809. <a name="l00777"></a>00777     <a class="code" href="a01685.html#ga4dea30e31d7780ea39872320f665fcb5" title="Send an icmpv6 error message.">uip_icmp6_error_output</a>(<a class="code" href="a01685.html#ga077f2445c09d34cea87ca9d435336c99" title="time exceeded">ICMP6_TIME_EXCEEDED</a>, <a class="code" href="a01685.html#ga4d8ca3e67d6cb7704a2e4d9ac3395815" title="ttl==0 in reass">ICMP6_TIME_EXCEED_REASSEMBLY</a>, 0);
    810. 

  810. <a name="l00778"></a>00778     
    811. 

  811. <a name="l00779"></a>00779     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.sent);
    812. 

  812. <a name="l00780"></a>00780     uip_flags = 0;
    813. 

  813. <a name="l00781"></a>00781   }
    814. 

  814. <a name="l00782"></a>00782 }
    815. 

  815. <a name="l00783"></a>00783 
    816. 

  816. <a name="l00784"></a>00784 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6_REASSEMBLY */</span>
    817. 

  817. <a name="l00785"></a>00785 
    818. 

  818. <a name="l00786"></a>00786 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    819. 

  819. <a name="l00787"></a>00787 <span class="preprocessor">#if UIP_TCP</span>
    820. 

  820. <a name="l00788"></a>00788 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">void</span>
    821. 

  821. <a name="l00789"></a>00789 uip_add_rcv_nxt(<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a> n)
    822. 

  822. <a name="l00790"></a>00790 {
    823. 

  823. <a name="l00791"></a>00791   <a class="code" href="a01684.html#ga6832e4d2d046536b6472f7ac92340f68" title="Carry out a 32-bit addition.">uip_add32</a>(uip_conn-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>, n);
    824. 

  824. <a name="l00792"></a>00792   uip_conn-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[0] = uip_acc32[0];
    825. 

  825. <a name="l00793"></a>00793   uip_conn-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[1] = uip_acc32[1];
    826. 

  826. <a name="l00794"></a>00794   uip_conn-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[2] = uip_acc32[2];
    827. 

  827. <a name="l00795"></a>00795   uip_conn-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[3] = uip_acc32[3];
    828. 

  828. <a name="l00796"></a>00796 }
    829. 

  829. <a name="l00797"></a>00797 <span class="preprocessor">#endif</span>
    830. 

  830. <a name="l00798"></a>00798 <span class="preprocessor"></span><span class="comment">/*---------------------------------------------------------------------------*/</span>
    831. 

  831. <a name="l00799"></a>00799 <span class="comment"></span>
    832. 

  832. <a name="l00800"></a>00800 <span class="comment">/**</span>
    833. 

  833. <a name="l00801"></a>00801 <span class="comment"> * \brief Process the options in Destination and Hop By Hop extension headers</span>
    834. 

  834. <a name="l00802"></a>00802 <span class="comment"> */</span>
    835. 

  835. <a name="l00803"></a>00803 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a>
    836. 

  836. <a name="l00804"></a>00804 ext_hdr_options_process() {
    837. 

  837. <a name="l00805"></a>00805  <span class="comment">/*</span>
    838. 

  838. <a name="l00806"></a>00806 <span class="comment">  * Length field in the extension header: length of th eheader in units of</span>
    839. 

  839. <a name="l00807"></a>00807 <span class="comment">  * 8 bytes, excluding the first 8 bytes</span>
    840. 

  840. <a name="l00808"></a>00808 <span class="comment">  * length field in an option : the length of data in the option</span>
    841. 

  841. <a name="l00809"></a>00809 <span class="comment">  */</span>
    842. 

  842. <a name="l00810"></a>00810   <a class="code" href="a01685.html#ga03780ccf09de63153b3b10c5d11875ab" title="length of the header options read">uip_ext_opt_offset</a> = 2;
    843. 

  843. <a name="l00811"></a>00811   <span class="keywordflow">while</span>(<a class="code" href="a01685.html#ga03780ccf09de63153b3b10c5d11875ab" title="length of the header options read">uip_ext_opt_offset</a>  &lt; ((UIP_EXT_BUF-&gt;len &lt;&lt; 3) + 8)) {
    844. 

  844. <a name="l00812"></a>00812     <span class="keywordflow">switch</span> (UIP_EXT_HDR_OPT_BUF-&gt;type) {
    845. 

  845. <a name="l00813"></a>00813       <span class="comment">/*</span>
    846. 

  846. <a name="l00814"></a>00814 <span class="comment">       * for now we do not support any options except padding ones</span>
    847. 

  847. <a name="l00815"></a>00815 <span class="comment">       * PAD1 does not make sense as the header must be 8bytes aligned,</span>
    848. 

  848. <a name="l00816"></a>00816 <span class="comment">       * hence we can only have</span>
    849. 

  849. <a name="l00817"></a>00817 <span class="comment">       */</span>
    850. 

  850. <a name="l00818"></a>00818       <span class="keywordflow">case</span> UIP_EXT_HDR_OPT_PAD1:
    851. 

  851. <a name="l00819"></a>00819         PRINTF(<span class="stringliteral">&quot;Processing PAD1 option\n&quot;</span>);
    852. 

  852. <a name="l00820"></a>00820         <a class="code" href="a01685.html#ga03780ccf09de63153b3b10c5d11875ab" title="length of the header options read">uip_ext_opt_offset</a> += 1;
    853. 

  853. <a name="l00821"></a>00821         <span class="keywordflow">break</span>;
    854. 

  854. <a name="l00822"></a>00822       <span class="keywordflow">case</span> UIP_EXT_HDR_OPT_PADN:
    855. 

  855. <a name="l00823"></a>00823         PRINTF(<span class="stringliteral">&quot;Processing PADN option\n&quot;</span>);
    856. 

  856. <a name="l00824"></a>00824         <a class="code" href="a01685.html#ga03780ccf09de63153b3b10c5d11875ab" title="length of the header options read">uip_ext_opt_offset</a> += UIP_EXT_HDR_OPT_PADN_BUF-&gt;opt_len + 2;
    857. 

  857. <a name="l00825"></a>00825         <span class="keywordflow">break</span>;
    858. 

  858. <a name="l00826"></a>00826       <span class="keywordflow">default</span>:
    859. 

  859. <a name="l00827"></a>00827         <span class="comment">/*</span>
    860. 

  860. <a name="l00828"></a>00828 <span class="comment">         * check the two highest order bits of the option</span>
    861. 

  861. <a name="l00829"></a>00829 <span class="comment">         * - 00 skip over this option and continue processing the header.</span>
    862. 

  862. <a name="l00830"></a>00830 <span class="comment">         * - 01 discard the packet.</span>
    863. 

  863. <a name="l00831"></a>00831 <span class="comment">         * - 10 discard the packet and, regardless of whether or not the</span>
    864. 

  864. <a name="l00832"></a>00832 <span class="comment">         *   packet&apos;s Destination Address was a multicast address, send an</span>
    865. 

  865. <a name="l00833"></a>00833 <span class="comment">         *   ICMP Parameter Problem, Code 2, message to the packet&apos;s</span>
    866. 

  866. <a name="l00834"></a>00834 <span class="comment">         *   Source Address, pointing to the unrecognized Option Type.</span>
    867. 

  867. <a name="l00835"></a>00835 <span class="comment">         * - 11 discard the packet and, only if the packet&apos;s Destination</span>
    868. 

  868. <a name="l00836"></a>00836 <span class="comment">         *   Address was not a multicast address, send an ICMP Parameter</span>
    869. 

  869. <a name="l00837"></a>00837 <span class="comment">         *   Problem, Code 2, message to the packet&apos;s Source Address,</span>
    870. 

  870. <a name="l00838"></a>00838 <span class="comment">         *   pointing to the unrecognized Option Type.</span>
    871. 

  871. <a name="l00839"></a>00839 <span class="comment">         */</span>
    872. 

  872. <a name="l00840"></a>00840         PRINTF(<span class="stringliteral">&quot;MSB %x\n&quot;</span>, UIP_EXT_HDR_OPT_BUF-&gt;type);
    873. 

  873. <a name="l00841"></a>00841         <span class="keywordflow">switch</span>(UIP_EXT_HDR_OPT_BUF-&gt;type &amp; 0xC0) {
    874. 

  874. <a name="l00842"></a>00842           <span class="keywordflow">case</span> 0:
    875. 

  875. <a name="l00843"></a>00843             <span class="keywordflow">break</span>;
    876. 

  876. <a name="l00844"></a>00844           <span class="keywordflow">case</span> 0x40:
    877. 

  877. <a name="l00845"></a>00845             <span class="keywordflow">return</span> 1;
    878. 

  878. <a name="l00846"></a>00846           <span class="keywordflow">case</span> 0xC0:
    879. 

  879. <a name="l00847"></a>00847             <span class="keywordflow">if</span>(uip_is_addr_mcast(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr)) {
    880. 

  880. <a name="l00848"></a>00848               <span class="keywordflow">return</span> 1;
    881. 

  881. <a name="l00849"></a>00849             }
    882. 

  882. <a name="l00850"></a>00850           <span class="keywordflow">case</span> 0x80:
    883. 

  883. <a name="l00851"></a>00851             <a class="code" href="a01685.html#ga4dea30e31d7780ea39872320f665fcb5" title="Send an icmpv6 error message.">uip_icmp6_error_output</a>(<a class="code" href="a01685.html#ga8d80ba426cf5f5d177e7464c8076b62a" title="ip6 header bad">ICMP6_PARAM_PROB</a>, <a class="code" href="a01685.html#gaefd8dedadd9588644c52d2fbe53c012e" title="unrecognized option">ICMP6_PARAMPROB_OPTION</a>,
    884. 

  884. <a name="l00852"></a>00852                              (<a class="code" href="a01668.html#ga4c14294869aceba3ef9d4c0c302d0f33" title="The 32-bit unsigned data type.">u32_t</a>)UIP_IPH_LEN + <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> + <a class="code" href="a01685.html#ga03780ccf09de63153b3b10c5d11875ab" title="length of the header options read">uip_ext_opt_offset</a>);
    885. 

  885. <a name="l00853"></a>00853             <span class="keywordflow">return</span> 2;
    886. 

  886. <a name="l00854"></a>00854         }
    887. 

  887. <a name="l00855"></a>00855         <span class="comment">/* in the cases were we did not discard, update ext_opt* */</span>
    888. 

  888. <a name="l00856"></a>00856         <a class="code" href="a01685.html#ga03780ccf09de63153b3b10c5d11875ab" title="length of the header options read">uip_ext_opt_offset</a> += UIP_EXT_HDR_OPT_BUF-&gt;len + 2;
    889. 

  889. <a name="l00857"></a>00857         <span class="keywordflow">break</span>;
    890. 

  890. <a name="l00858"></a>00858     }
    891. 

  891. <a name="l00859"></a>00859   }
    892. 

  892. <a name="l00860"></a>00860   <span class="keywordflow">return</span> 0;
    893. 

  893. <a name="l00861"></a>00861 }
    894. 

  894. <a name="l00862"></a>00862 
    895. 

  895. <a name="l00863"></a>00863 
    896. 

  896. <a name="l00864"></a>00864 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    897. 

  897. <a name="l00865"></a>00865 <span class="keywordtype">void</span>
    898. 

  898. <a name="l00866"></a><a class="code" href="a01685.html#ga266263ac78a1361a2b1d15741d3b0675">00866</a> <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)
    899. 

  899. <a name="l00867"></a>00867 {
    900. 

  900. <a name="l00868"></a>00868 <span class="preprocessor">#if UIP_TCP</span>
    901. 

  901. <a name="l00869"></a>00869 <span class="preprocessor"></span>  <span class="keyword">register</span> <span class="keyword">struct </span>uip_conn *uip_connr = uip_conn;
    902. 

  902. <a name="l00870"></a>00870 <span class="preprocessor">#endif </span><span class="comment">/* UIP_TCP */</span>
    903. 

  903. <a name="l00871"></a>00871 <span class="preprocessor">#if UIP_UDP</span>
    904. 

  904. <a name="l00872"></a>00872 <span class="preprocessor"></span>  <span class="keywordflow">if</span>(flag == UIP_UDP_SEND_CONN) {
    905. 

  905. <a name="l00873"></a>00873     <span class="keywordflow">goto</span> udp_send;
    906. 

  906. <a name="l00874"></a>00874   }
    907. 

  907. <a name="l00875"></a>00875 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
    908. 

  908. <a name="l00876"></a>00876   uip_sappdata = <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = &amp;uip_buf[UIP_IPTCPH_LEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a>];
    909. 

  909. <a name="l00877"></a>00877    
    910. 

  910. <a name="l00878"></a>00878   <span class="comment">/* Check if we were invoked because of a poll request for a</span>
    911. 

  911. <a name="l00879"></a>00879 <span class="comment">     particular connection. */</span>
    912. 

  912. <a name="l00880"></a>00880   <span class="keywordflow">if</span>(flag == UIP_POLL_REQUEST) {
    913. 

  913. <a name="l00881"></a>00881 <span class="preprocessor">#if UIP_TCP</span>
    914. 

  914. <a name="l00882"></a>00882 <span class="preprocessor"></span>    <span class="keywordflow">if</span>((uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> &amp; UIP_TS_MASK) == UIP_ESTABLISHED &amp;&amp;
    915. 

  915. <a name="l00883"></a>00883        !uip_outstanding(uip_connr)) {
    916. 

  916. <a name="l00884"></a>00884       uip_flags = UIP_POLL;
    917. 

  917. <a name="l00885"></a>00885       <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>();
    918. 

  918. <a name="l00886"></a>00886       <span class="keywordflow">goto</span> appsend;
    919. 

  919. <a name="l00887"></a>00887 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
    920. 

  920. <a name="l00888"></a>00888 <span class="preprocessor"></span>    } <span class="keywordflow">else</span> <span class="keywordflow">if</span>((uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> &amp; UIP_TS_MASK) == UIP_SYN_SENT) {
    921. 

  921. <a name="l00889"></a>00889       <span class="comment">/* In the SYN_SENT state, we retransmit out SYN. */</span>
    922. 

  922. <a name="l00890"></a>00890       UIP_TCP_BUF-&gt;flags = 0;
    923. 

  923. <a name="l00891"></a>00891       <span class="keywordflow">goto</span> tcp_send_syn;
    924. 

  924. <a name="l00892"></a>00892 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
    925. 

  925. <a name="l00893"></a>00893     }
    926. 

  926. <a name="l00894"></a>00894     <span class="keywordflow">goto</span> drop;
    927. 

  927. <a name="l00895"></a>00895 <span class="preprocessor">#endif </span><span class="comment">/* UIP_TCP */</span>
    928. 

  928. <a name="l00896"></a>00896     <span class="comment">/* Check if we were invoked because of the perodic timer fireing. */</span>
    929. 

  929. <a name="l00897"></a>00897   } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(flag == UIP_TIMER) {
    930. 

  930. <a name="l00898"></a>00898     <span class="comment">/* Reset the length variables. */</span>
    931. 

  931. <a name="l00899"></a>00899 <span class="preprocessor">#if UIP_TCP</span>
    932. 

  932. <a name="l00900"></a>00900 <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> = 0;
    933. 

  933. <a name="l00901"></a>00901     uip_slen = 0;
    934. 

  934. <a name="l00902"></a>00902     
    935. 

  935. <a name="l00903"></a>00903     <span class="comment">/* Increase the initial sequence number. */</span>
    936. 

  936. <a name="l00904"></a>00904     <span class="keywordflow">if</span>(++iss[3] == 0) {
    937. 

  937. <a name="l00905"></a>00905       <span class="keywordflow">if</span>(++iss[2] == 0) {
    938. 

  938. <a name="l00906"></a>00906         <span class="keywordflow">if</span>(++iss[1] == 0) {
    939. 

  939. <a name="l00907"></a>00907           ++iss[0];
    940. 

  940. <a name="l00908"></a>00908         }
    941. 

  941. <a name="l00909"></a>00909       }
    942. 

  942. <a name="l00910"></a>00910     }
    943. 

  943. <a name="l00911"></a>00911     
    944. 

  944. <a name="l00912"></a>00912     <span class="comment">/*</span>
    945. 

  945. <a name="l00913"></a>00913 <span class="comment">     * Check if the connection is in a state in which we simply wait</span>
    946. 

  946. <a name="l00914"></a>00914 <span class="comment">     * for the connection to time out. If so, we increase the</span>
    947. 

  947. <a name="l00915"></a>00915 <span class="comment">     * connection&apos;s timer and remove the connection if it times</span>
    948. 

  948. <a name="l00916"></a>00916 <span class="comment">     * out.</span>
    949. 

  949. <a name="l00917"></a>00917 <span class="comment">     */</span>
    950. 

  950. <a name="l00918"></a>00918     <span class="keywordflow">if</span>(uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_TIME_WAIT ||
    951. 

  951. <a name="l00919"></a>00919        uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_FIN_WAIT_2) {
    952. 

  952. <a name="l00920"></a>00920       ++(uip_connr-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a>);
    953. 

  953. <a name="l00921"></a>00921       <span class="keywordflow">if</span>(uip_connr-&gt;<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>) {
    954. 

  954. <a name="l00922"></a>00922         uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
    955. 

  955. <a name="l00923"></a>00923       }
    956. 

  956. <a name="l00924"></a>00924     } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> != UIP_CLOSED) {
    957. 

  957. <a name="l00925"></a>00925       <span class="comment">/*</span>
    958. 

  958. <a name="l00926"></a>00926 <span class="comment">       * If the connection has outstanding data, we increase the</span>
    959. 

  959. <a name="l00927"></a>00927 <span class="comment">       * connection&apos;s timer and see if it has reached the RTO value</span>
    960. 

  960. <a name="l00928"></a>00928 <span class="comment">       * in which case we retransmit.</span>
    961. 

  961. <a name="l00929"></a>00929 <span class="comment">       */</span>
    962. 

  962. <a name="l00930"></a>00930       <span class="keywordflow">if</span>(uip_outstanding(uip_connr)) {
    963. 

  963. <a name="l00931"></a>00931         <span class="keywordflow">if</span>(uip_connr-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a>-- == 0) {
    964. 

  964. <a name="l00932"></a>00932           <span class="keywordflow">if</span>(uip_connr-&gt;<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> ||
    965. 

  965. <a name="l00933"></a>00933              ((uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_SYN_SENT ||
    966. 

  966. <a name="l00934"></a>00934                uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_SYN_RCVD) &amp;&amp;
    967. 

  967. <a name="l00935"></a>00935               uip_connr-&gt;<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>)) {
    968. 

  968. <a name="l00936"></a>00936             uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
    969. 

  969. <a name="l00937"></a>00937                   
    970. 

  970. <a name="l00938"></a>00938             <span class="comment">/*</span>
    971. 

  971. <a name="l00939"></a>00939 <span class="comment">             * We call UIP_APPCALL() with uip_flags set to</span>
    972. 

  972. <a name="l00940"></a>00940 <span class="comment">             * UIP_TIMEDOUT to inform the application that the</span>
    973. 

  973. <a name="l00941"></a>00941 <span class="comment">             * connection has timed out.</span>
    974. 

  974. <a name="l00942"></a>00942 <span class="comment">             */</span>
    975. 

  975. <a name="l00943"></a>00943             uip_flags = UIP_TIMEDOUT;
    976. 

  976. <a name="l00944"></a>00944             <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>();
    977. 

  977. <a name="l00945"></a>00945                   
    978. 

  978. <a name="l00946"></a>00946             <span class="comment">/* We also send a reset packet to the remote host. */</span>
    979. 

  979. <a name="l00947"></a>00947             UIP_TCP_BUF-&gt;flags = TCP_RST | TCP_ACK;
    980. 

  980. <a name="l00948"></a>00948             <span class="keywordflow">goto</span> tcp_send_nodata;
    981. 

  981. <a name="l00949"></a>00949           }
    982. 

  982. <a name="l00950"></a>00950                
    983. 

  983. <a name="l00951"></a>00951           <span class="comment">/* Exponential backoff. */</span>
    984. 

  984. <a name="l00952"></a>00952           uip_connr-&gt;<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> &lt;&lt; (uip_connr-&gt;<a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> &gt; 4?
    985. 

  985. <a name="l00953"></a>00953                                          4:
    986. 

  986. <a name="l00954"></a>00954                                          uip_connr-&gt;<a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a>);
    987. 

  987. <a name="l00955"></a>00955           ++(uip_connr-&gt;<a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a>);
    988. 

  988. <a name="l00956"></a>00956                
    989. 

  989. <a name="l00957"></a>00957           <span class="comment">/*</span>
    990. 

  990. <a name="l00958"></a>00958 <span class="comment">           * Ok, so we need to retransmit. We do this differently</span>
    991. 

  991. <a name="l00959"></a>00959 <span class="comment">           * depending on which state we are in. In ESTABLISHED, we</span>
    992. 

  992. <a name="l00960"></a>00960 <span class="comment">           * call upon the application so that it may prepare the</span>
    993. 

  993. <a name="l00961"></a>00961 <span class="comment">           * data for the retransmit. In SYN_RCVD, we resend the</span>
    994. 

  994. <a name="l00962"></a>00962 <span class="comment">           * SYNACK that we sent earlier and in LAST_ACK we have to</span>
    995. 

  995. <a name="l00963"></a>00963 <span class="comment">           * retransmit our FINACK.</span>
    996. 

  996. <a name="l00964"></a>00964 <span class="comment">           */</span>
    997. 

  997. <a name="l00965"></a>00965           <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.rexmit);
    998. 

  998. <a name="l00966"></a>00966           <span class="keywordflow">switch</span>(uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> &amp; UIP_TS_MASK) {
    999. 

  999. <a name="l00967"></a>00967             <span class="keywordflow">case</span> UIP_SYN_RCVD:
    1000. 

  1000. <a name="l00968"></a>00968               <span class="comment">/* In the SYN_RCVD state, we should retransmit our SYNACK. */</span>
    1001. 

  1001. <a name="l00969"></a>00969               <span class="keywordflow">goto</span> tcp_send_synack;
    1002. 

  1002. <a name="l00970"></a>00970                      
    1003. 

  1003. <a name="l00971"></a>00971 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
    1004. 

  1004. <a name="l00972"></a>00972 <span class="preprocessor"></span>            <span class="keywordflow">case</span> UIP_SYN_SENT:
    1005. 

  1005. <a name="l00973"></a>00973               <span class="comment">/* In the SYN_SENT state, we retransmit out SYN. */</span>
    1006. 

  1006. <a name="l00974"></a>00974               UIP_TCP_BUF-&gt;flags = 0;
    1007. 

  1007. <a name="l00975"></a>00975               <span class="keywordflow">goto</span> tcp_send_syn;
    1008. 

  1008. <a name="l00976"></a>00976 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
    1009. 

  1009. <a name="l00977"></a>00977                      
    1010. 

  1010. <a name="l00978"></a>00978             <span class="keywordflow">case</span> UIP_ESTABLISHED:
    1011. 

  1011. <a name="l00979"></a>00979               <span class="comment">/*</span>
    1012. 

  1012. <a name="l00980"></a>00980 <span class="comment">               * In the ESTABLISHED state, we call upon the application</span>
    1013. 

  1013. <a name="l00981"></a>00981 <span class="comment">               * to do the actual retransmit after which we jump into</span>
    1014. 

  1014. <a name="l00982"></a>00982 <span class="comment">               * the code for sending out the packet (the apprexmit</span>
    1015. 

  1015. <a name="l00983"></a>00983 <span class="comment">               * label).</span>
    1016. 

  1016. <a name="l00984"></a>00984 <span class="comment">               */</span>
    1017. 

  1017. <a name="l00985"></a>00985               uip_flags = UIP_REXMIT;
    1018. 

  1018. <a name="l00986"></a>00986               <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>();
    1019. 

  1019. <a name="l00987"></a>00987               <span class="keywordflow">goto</span> apprexmit;
    1020. 

  1020. <a name="l00988"></a>00988                      
    1021. 

  1021. <a name="l00989"></a>00989             <span class="keywordflow">case</span> UIP_FIN_WAIT_1:
    1022. 

  1022. <a name="l00990"></a>00990             <span class="keywordflow">case</span> UIP_CLOSING:
    1023. 

  1023. <a name="l00991"></a>00991             <span class="keywordflow">case</span> UIP_LAST_ACK:
    1024. 

  1024. <a name="l00992"></a>00992               <span class="comment">/* In all these states we should retransmit a FINACK. */</span>
    1025. 

  1025. <a name="l00993"></a>00993               <span class="keywordflow">goto</span> tcp_send_finack;
    1026. 

  1026. <a name="l00994"></a>00994           }
    1027. 

  1027. <a name="l00995"></a>00995         }
    1028. 

  1028. <a name="l00996"></a>00996       } <span class="keywordflow">else</span> <span class="keywordflow">if</span>((uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> &amp; UIP_TS_MASK) == UIP_ESTABLISHED) {
    1029. 

  1029. <a name="l00997"></a>00997         <span class="comment">/*</span>
    1030. 

  1030. <a name="l00998"></a>00998 <span class="comment">         * If there was no need for a retransmission, we poll the</span>
    1031. 

  1031. <a name="l00999"></a>00999 <span class="comment">         * application for new data.</span>
    1032. 

  1032. <a name="l01000"></a>01000 <span class="comment">         */</span>
    1033. 

  1033. <a name="l01001"></a>01001         uip_flags = UIP_POLL;
    1034. 

  1034. <a name="l01002"></a>01002         <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>();
    1035. 

  1035. <a name="l01003"></a>01003         <span class="keywordflow">goto</span> appsend;
    1036. 

  1036. <a name="l01004"></a>01004       }
    1037. 

  1037. <a name="l01005"></a>01005     }
    1038. 

  1038. <a name="l01006"></a>01006     <span class="keywordflow">goto</span> drop;
    1039. 

  1039. <a name="l01007"></a>01007 <span class="preprocessor">#endif </span><span class="comment">/* UIP_TCP */</span>
    1040. 

  1040. <a name="l01008"></a>01008   }
    1041. 

  1041. <a name="l01009"></a>01009 <span class="preprocessor">#if UIP_UDP</span>
    1042. 

  1042. <a name="l01010"></a>01010 <span class="preprocessor"></span>  <span class="keywordflow">if</span>(flag == UIP_UDP_TIMER) {
    1043. 

  1043. <a name="l01011"></a>01011     <span class="keywordflow">if</span>(uip_udp_conn-&gt;<a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> != 0) {
    1044. 

  1044. <a name="l01012"></a>01012       uip_conn = NULL;
    1045. 

  1045. <a name="l01013"></a>01013       uip_sappdata = <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = &amp;uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + UIP_IPUDPH_LEN];
    1046. 

  1046. <a name="l01014"></a>01014       <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = uip_slen = 0;
    1047. 

  1047. <a name="l01015"></a>01015       uip_flags = UIP_POLL;
    1048. 

  1048. <a name="l01016"></a>01016       UIP_UDP_APPCALL();
    1049. 

  1049. <a name="l01017"></a>01017       <span class="keywordflow">goto</span> udp_send;
    1050. 

  1050. <a name="l01018"></a>01018     } <span class="keywordflow">else</span> {
    1051. 

  1051. <a name="l01019"></a>01019       <span class="keywordflow">goto</span> drop;
    1052. 

  1052. <a name="l01020"></a>01020     }
    1053. 

  1053. <a name="l01021"></a>01021   }
    1054. 

  1054. <a name="l01022"></a>01022 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
    1055. 

  1055. <a name="l01023"></a>01023 
    1056. 

  1056. <a name="l01024"></a>01024   
    1057. 

  1057. <a name="l01025"></a>01025   <span class="comment">/* This is where the input processing starts. */</span>
    1058. 

  1058. <a name="l01026"></a>01026   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.recv);
    1059. 

  1059. <a name="l01027"></a>01027    
    1060. 

  1060. <a name="l01028"></a>01028   <span class="comment">/* Start of IP input header processing code. */</span>
    1061. 

  1061. <a name="l01029"></a>01029    
    1062. 

  1062. <a name="l01030"></a>01030   <span class="comment">/* Check validity of the IP header. */</span>
    1063. 

  1063. <a name="l01031"></a>01031   <span class="keywordflow">if</span>((<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;vtc &amp; 0xf0) != 0x60)  { <span class="comment">/* IP version and header length. */</span>
    1064. 

  1064. <a name="l01032"></a>01032     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
    1065. 

  1065. <a name="l01033"></a>01033     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.vhlerr);
    1066. 

  1066. <a name="l01034"></a>01034     UIP_LOG(<span class="stringliteral">&quot;ipv6: invalid version.&quot;</span>);
    1067. 

  1067. <a name="l01035"></a>01035     <span class="keywordflow">goto</span> drop;
    1068. 

  1068. <a name="l01036"></a>01036   }
    1069. 

  1069. <a name="l01037"></a>01037   <span class="comment">/*</span>
    1070. 

  1070. <a name="l01038"></a>01038 <span class="comment">   * Check the size of the packet. If the size reported to us in</span>
    1071. 

  1071. <a name="l01039"></a>01039 <span class="comment">   * uip_len is smaller the size reported in the IP header, we assume</span>
    1072. 

  1072. <a name="l01040"></a>01040 <span class="comment">   * that the packet has been corrupted in transit. If the size of</span>
    1073. 

  1073. <a name="l01041"></a>01041 <span class="comment">   * uip_len is larger than the size reported in the IP packet header,</span>
    1074. 

  1074. <a name="l01042"></a>01042 <span class="comment">   * the packet has been padded and we set uip_len to the correct</span>
    1075. 

  1075. <a name="l01043"></a>01043 <span class="comment">   * value..</span>
    1076. 

  1076. <a name="l01044"></a>01044 <span class="comment">   */</span>
    1077. 

  1077. <a name="l01045"></a>01045    
    1078. 

  1078. <a name="l01046"></a>01046   <span class="keywordflow">if</span>((<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[0] &lt;&lt; 8) + <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[1] &lt;= <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>) {
    1079. 

  1079. <a name="l01047"></a>01047     <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="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[0] &lt;&lt; 8) + <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[1] + UIP_IPH_LEN;
    1080. 

  1080. <a name="l01048"></a>01048     <span class="comment">/*</span>
    1081. 

  1081. <a name="l01049"></a>01049 <span class="comment">     * The length reported in the IPv6 header is the</span>
    1082. 

  1082. <a name="l01050"></a>01050 <span class="comment">     * length of the payload that follows the</span>
    1083. 

  1083. <a name="l01051"></a>01051 <span class="comment">     * header. However, uIP uses the uip_len variable</span>
    1084. 

  1084. <a name="l01052"></a>01052 <span class="comment">     * for holding the size of the entire packet,</span>
    1085. 

  1085. <a name="l01053"></a>01053 <span class="comment">     * including the IP header. For IPv4 this is not a</span>
    1086. 

  1086. <a name="l01054"></a>01054 <span class="comment">     * problem as the length field in the IPv4 header</span>
    1087. 

  1087. <a name="l01055"></a>01055 <span class="comment">     * contains the length of the entire packet. But</span>
    1088. 

  1088. <a name="l01056"></a>01056 <span class="comment">     * for IPv6 we need to add the size of the IPv6</span>
    1089. 

  1089. <a name="l01057"></a>01057 <span class="comment">     * header (40 bytes).</span>
    1090. 

  1090. <a name="l01058"></a>01058 <span class="comment">     */</span>
    1091. 

  1091. <a name="l01059"></a>01059   } <span class="keywordflow">else</span> {
    1092. 

  1092. <a name="l01060"></a>01060     UIP_LOG(<span class="stringliteral">&quot;ip: packet shorter than reported in IP header.&quot;</span>);
    1093. 

  1093. <a name="l01061"></a>01061     <span class="keywordflow">goto</span> drop;
    1094. 

  1094. <a name="l01062"></a>01062   }
    1095. 

  1095. <a name="l01063"></a>01063   
    1096. 

  1096. <a name="l01064"></a>01064   PRINTF(<span class="stringliteral">&quot;IPv6 packet received from &quot;</span>);
    1097. 

  1097. <a name="l01065"></a>01065   PRINT6ADDR(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;srcipaddr);
    1098. 

  1098. <a name="l01066"></a>01066   PRINTF(<span class="stringliteral">&quot; to &quot;</span>);
    1099. 

  1099. <a name="l01067"></a>01067   PRINT6ADDR(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr);
    1100. 

  1100. <a name="l01068"></a>01068   PRINTF(<span class="stringliteral">&quot;\n&quot;</span>);
    1101. 

  1101. <a name="l01069"></a>01069 
    1102. 

  1102. <a name="l01070"></a>01070   <span class="keywordflow">if</span>(uip_is_addr_mcast(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;srcipaddr)){
    1103. 

  1103. <a name="l01071"></a>01071     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
    1104. 

  1104. <a name="l01072"></a>01072     PRINTF(<span class="stringliteral">&quot;Dropping packet, src is mcast\n&quot;</span>);
    1105. 

  1105. <a name="l01073"></a>01073     <span class="keywordflow">goto</span> drop;
    1106. 

  1106. <a name="l01074"></a>01074   }
    1107. 

  1107. <a name="l01075"></a>01075 
    1108. 

  1108. <a name="l01076"></a>01076 <span class="preprocessor">#if UIP_CONF_ROUTER</span>
    1109. 

  1109. <a name="l01077"></a>01077 <span class="preprocessor"></span>  <span class="comment">/* TBD Some Parameter problem messages */</span>
    1110. 

  1110. <a name="l01078"></a>01078   <span class="keywordflow">if</span>(!<a class="code" href="a01685.html#ga015f9249ce301bc05616a89f0b6d6aab">uip_ds6_is_my_addr</a>(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr) &amp;&amp;
    1111. 

  1111. <a name="l01079"></a>01079      !uip_ds6_is_my_maddr(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr)) {
    1112. 

  1112. <a name="l01080"></a>01080     <span class="keywordflow">if</span>(!uip_is_addr_mcast(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr) &amp;&amp;
    1113. 

  1113. <a name="l01081"></a>01081        !uip_is_addr_link_local(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr) &amp;&amp;
    1114. 

  1114. <a name="l01082"></a>01082        !uip_is_addr_link_local(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;srcipaddr) &amp;&amp;
    1115. 

  1115. <a name="l01083"></a>01083        !uip_is_addr_unspecified(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;srcipaddr) &amp;&amp;
    1116. 

  1116. <a name="l01084"></a>01084        !uip_is_addr_loopback(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr)) {
    1117. 

  1117. <a name="l01085"></a>01085 
    1118. 

  1118. <a name="l01086"></a>01086 
    1119. 

  1119. <a name="l01087"></a>01087       <span class="comment">/* Check MTU */</span>
    1120. 

  1120. <a name="l01088"></a>01088       <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> &gt; <a class="code" href="a01583.html#gadeb506ec5eebfb9b32a6210eaa2ae38e" title="The maximum transmission unit at the IP Layer.">UIP_LINK_MTU</a>) {
    1121. 

  1121. <a name="l01089"></a>01089         <a class="code" href="a01685.html#ga4dea30e31d7780ea39872320f665fcb5" title="Send an icmpv6 error message.">uip_icmp6_error_output</a>(<a class="code" href="a01685.html#ga5fb591c09385316c21ff48ca525377cc" title="packet too big">ICMP6_PACKET_TOO_BIG</a>, 0, <a class="code" href="a01583.html#gadeb506ec5eebfb9b32a6210eaa2ae38e" title="The maximum transmission unit at the IP Layer.">UIP_LINK_MTU</a>);
    1122. 

  1122. <a name="l01090"></a>01090         <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
    1123. 

  1123. <a name="l01091"></a>01091         <span class="keywordflow">goto</span> send;
    1124. 

  1124. <a name="l01092"></a>01092       }
    1125. 

  1125. <a name="l01093"></a>01093       <span class="comment">/* Check Hop Limit */</span>
    1126. 

  1126. <a name="l01094"></a>01094       <span class="keywordflow">if</span>(<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;ttl &lt;= 1) {
    1127. 

  1127. <a name="l01095"></a>01095         <a class="code" href="a01685.html#ga4dea30e31d7780ea39872320f665fcb5" title="Send an icmpv6 error message.">uip_icmp6_error_output</a>(<a class="code" href="a01685.html#ga077f2445c09d34cea87ca9d435336c99" title="time exceeded">ICMP6_TIME_EXCEEDED</a>,
    1128. 

  1128. <a name="l01096"></a>01096                                <a class="code" href="a01685.html#gaff4b11555fb80f10e494578d350454a4" title="ttl==0 in transit">ICMP6_TIME_EXCEED_TRANSIT</a>, 0);
    1129. 

  1129. <a name="l01097"></a>01097         <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
    1130. 

  1130. <a name="l01098"></a>01098         <span class="keywordflow">goto</span> send;
    1131. 

  1131. <a name="l01099"></a>01099       }
    1132. 

  1132. <a name="l01100"></a>01100       <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;ttl = <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;ttl - 1;
    1133. 

  1133. <a name="l01101"></a>01101       PRINTF(<span class="stringliteral">&quot;Forwarding packet to &quot;</span>);
    1134. 

  1134. <a name="l01102"></a>01102       PRINT6ADDR(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr);
    1135. 

  1135. <a name="l01103"></a>01103       PRINTF(<span class="stringliteral">&quot;\n&quot;</span>);
    1136. 

  1136. <a name="l01104"></a>01104       <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.forwarded);
    1137. 

  1137. <a name="l01105"></a>01105       <span class="keywordflow">goto</span> send;
    1138. 

  1138. <a name="l01106"></a>01106     } <span class="keywordflow">else</span> {
    1139. 

  1139. <a name="l01107"></a>01107       <span class="keywordflow">if</span>((uip_is_addr_link_local(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;srcipaddr)) &amp;&amp;
    1140. 

  1140. <a name="l01108"></a>01108          (!uip_is_addr_unspecified(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;srcipaddr)) &amp;&amp;
    1141. 

  1141. <a name="l01109"></a>01109          (!uip_is_addr_loopback(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr)) &amp;&amp;
    1142. 

  1142. <a name="l01110"></a>01110          (!uip_is_addr_mcast(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr)) &amp;&amp;
    1143. 

  1143. <a name="l01111"></a>01111          (!uip_ds6_is_addr_onlink((&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr)))) {
    1144. 

  1144. <a name="l01112"></a>01112         PRINTF(<span class="stringliteral">&quot;LL source address with off link destination, dropping\n&quot;</span>);
    1145. 

  1145. <a name="l01113"></a>01113         <a class="code" href="a01685.html#ga4dea30e31d7780ea39872320f665fcb5" title="Send an icmpv6 error message.">uip_icmp6_error_output</a>(<a class="code" href="a01685.html#ga24a92fa6c87bf49df9c7afbf3b7137f2" title="dest unreachable">ICMP6_DST_UNREACH</a>,
    1146. 

  1146. <a name="l01114"></a>01114                                <a class="code" href="a01685.html#ga4d4a04bb3d37647c35e2ab21fe5279c1" title="not a neighbor(obsolete)">ICMP6_DST_UNREACH_NOTNEIGHBOR</a>, 0);
    1147. 

  1147. <a name="l01115"></a>01115         <span class="keywordflow">goto</span> send;
    1148. 

  1148. <a name="l01116"></a>01116       }
    1149. 

  1149. <a name="l01117"></a>01117       PRINTF(<span class="stringliteral">&quot;Dropping packet, not for me and link local or multicast\n&quot;</span>);
    1150. 

  1150. <a name="l01118"></a>01118       <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
    1151. 

  1151. <a name="l01119"></a>01119       <span class="keywordflow">goto</span> drop;
    1152. 

  1152. <a name="l01120"></a>01120     }
    1153. 

  1153. <a name="l01121"></a>01121   }
    1154. 

  1154. <a name="l01122"></a>01122 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_ROUTER */</span>
    1155. 

  1155. <a name="l01123"></a>01123   <span class="keywordflow">if</span>(!<a class="code" href="a01685.html#ga015f9249ce301bc05616a89f0b6d6aab">uip_ds6_is_my_addr</a>(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr) &amp;&amp;
    1156. 

  1156. <a name="l01124"></a>01124      !uip_ds6_is_my_maddr(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr) &amp;&amp;
    1157. 

  1157. <a name="l01125"></a>01125      !uip_is_addr_mcast(&amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;destipaddr)) {
    1158. 

  1158. <a name="l01126"></a>01126     PRINTF(<span class="stringliteral">&quot;Dropping packet, not for me\n&quot;</span>);
    1159. 

  1159. <a name="l01127"></a>01127     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
    1160. 

  1160. <a name="l01128"></a>01128     <span class="keywordflow">goto</span> drop;
    1161. 

  1161. <a name="l01129"></a>01129   }
    1162. 

  1162. <a name="l01130"></a>01130 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_ROUTER */</span>
    1163. 

  1163. <a name="l01131"></a>01131 
    1164. 

  1164. <a name="l01132"></a>01132   <span class="comment">/*</span>
    1165. 

  1165. <a name="l01133"></a>01133 <span class="comment">   * Next header field processing. In IPv6, we can have extension headers,</span>
    1166. 

  1166. <a name="l01134"></a>01134 <span class="comment">   * they are processed here</span>
    1167. 

  1167. <a name="l01135"></a>01135 <span class="comment">   */</span>
    1168. 

  1168. <a name="l01136"></a>01136   <a class="code" href="a01685.html#gaa605d238ba40e21d7200fe94d6abc46d" title="Type of the next header in IPv6 header or extension headers.">uip_next_hdr</a> = &amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;proto;
    1169. 

  1169. <a name="l01137"></a>01137   <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> = 0;
    1170. 

  1170. <a name="l01138"></a>01138   <a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> = 0;
    1171. 

  1171. <a name="l01139"></a>01139   <span class="keywordflow">while</span>(1) {
    1172. 

  1172. <a name="l01140"></a>01140     <span class="keywordflow">switch</span>(*<a class="code" href="a01685.html#gaa605d238ba40e21d7200fe94d6abc46d" title="Type of the next header in IPv6 header or extension headers.">uip_next_hdr</a>){
    1173. 

  1173. <a name="l01141"></a>01141 <span class="preprocessor">#if UIP_TCP</span>
    1174. 

  1174. <a name="l01142"></a>01142 <span class="preprocessor"></span>      <span class="keywordflow">case</span> UIP_PROTO_TCP:
    1175. 

  1175. <a name="l01143"></a>01143         <span class="comment">/* TCP, for both IPv4 and IPv6 */</span>
    1176. 

  1176. <a name="l01144"></a>01144         <span class="keywordflow">goto</span> tcp_input;
    1177. 

  1177. <a name="l01145"></a>01145 <span class="preprocessor">#endif </span><span class="comment">/* UIP_TCP */</span>
    1178. 

  1178. <a name="l01146"></a>01146 <span class="preprocessor">#if UIP_UDP</span>
    1179. 

  1179. <a name="l01147"></a>01147 <span class="preprocessor"></span>      <span class="keywordflow">case</span> UIP_PROTO_UDP:
    1180. 

  1180. <a name="l01148"></a>01148         <span class="comment">/* UDP, for both IPv4 and IPv6 */</span>
    1181. 

  1181. <a name="l01149"></a>01149         <span class="keywordflow">goto</span> udp_input;
    1182. 

  1182. <a name="l01150"></a>01150 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
    1183. 

  1183. <a name="l01151"></a>01151       <span class="keywordflow">case</span> UIP_PROTO_ICMP6:
    1184. 

  1184. <a name="l01152"></a>01152         <span class="comment">/* ICMPv6 */</span>
    1185. 

  1185. <a name="l01153"></a>01153         <span class="keywordflow">goto</span> icmp6_input;
    1186. 

  1186. <a name="l01154"></a>01154       <span class="keywordflow">case</span> UIP_PROTO_HBHO:
    1187. 

  1187. <a name="l01155"></a>01155         PRINTF(<span class="stringliteral">&quot;Processing hbh header\n&quot;</span>);
    1188. 

  1188. <a name="l01156"></a>01156         <span class="comment">/* Hop by hop option header */</span>
    1189. 

  1189. <a name="l01157"></a>01157 <span class="preprocessor">#if UIP_CONF_IPV6_CHECKS</span>
    1190. 

  1190. <a name="l01158"></a>01158 <span class="preprocessor"></span>        <span class="comment">/* Hop by hop option header. If we saw one HBH already, drop */</span>
    1191. 

  1191. <a name="l01159"></a>01159         <span class="keywordflow">if</span>(<a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> &amp; UIP_EXT_HDR_BITMAP_HBHO) {
    1192. 

  1192. <a name="l01160"></a>01160           <span class="keywordflow">goto</span> bad_hdr;
    1193. 

  1193. <a name="l01161"></a>01161         } <span class="keywordflow">else</span> {
    1194. 

  1194. <a name="l01162"></a>01162           <a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> |= UIP_EXT_HDR_BITMAP_HBHO;
    1195. 

  1195. <a name="l01163"></a>01163         }
    1196. 

  1196. <a name="l01164"></a>01164 <span class="preprocessor">#endif </span><span class="comment">/*UIP_CONF_IPV6_CHECKS*/</span>
    1197. 

  1197. <a name="l01165"></a>01165         <span class="keywordflow">switch</span>(ext_hdr_options_process()) {
    1198. 

  1198. <a name="l01166"></a>01166           <span class="keywordflow">case</span> 0:
    1199. 

  1199. <a name="l01167"></a>01167             <span class="comment">/*continue*/</span>
    1200. 

  1200. <a name="l01168"></a>01168             <a class="code" href="a01685.html#gaa605d238ba40e21d7200fe94d6abc46d" title="Type of the next header in IPv6 header or extension headers.">uip_next_hdr</a> = &amp;UIP_EXT_BUF-&gt;next;
    1201. 

  1201. <a name="l01169"></a>01169             <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> += (UIP_EXT_BUF-&gt;len &lt;&lt; 3) + 8;
    1202. 

  1202. <a name="l01170"></a>01170             <span class="keywordflow">break</span>;
    1203. 

  1203. <a name="l01171"></a>01171           <span class="keywordflow">case</span> 1:
    1204. 

  1204. <a name="l01172"></a>01172             <span class="comment">/*silently discard*/</span>
    1205. 

  1205. <a name="l01173"></a>01173             <span class="keywordflow">goto</span> drop;
    1206. 

  1206. <a name="l01174"></a>01174           <span class="keywordflow">case</span> 2:
    1207. 

  1207. <a name="l01175"></a>01175             <span class="comment">/* send icmp error message (created in ext_hdr_options_process)</span>
    1208. 

  1208. <a name="l01176"></a>01176 <span class="comment">             * and discard*/</span>
    1209. 

  1209. <a name="l01177"></a>01177             <span class="keywordflow">goto</span> send;
    1210. 

  1210. <a name="l01178"></a>01178         }
    1211. 

  1211. <a name="l01179"></a>01179         <span class="keywordflow">break</span>;
    1212. 

  1212. <a name="l01180"></a>01180       <span class="keywordflow">case</span> UIP_PROTO_DESTO:
    1213. 

  1213. <a name="l01181"></a>01181 <span class="preprocessor">#if UIP_CONF_IPV6_CHECKS</span>
    1214. 

  1214. <a name="l01182"></a>01182 <span class="preprocessor"></span>        <span class="comment">/* Destination option header. if we saw two already, drop */</span>
    1215. 

  1215. <a name="l01183"></a>01183         PRINTF(<span class="stringliteral">&quot;Processing desto header\n&quot;</span>);
    1216. 

  1216. <a name="l01184"></a>01184         <span class="keywordflow">if</span>(<a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> &amp; UIP_EXT_HDR_BITMAP_DESTO1) {
    1217. 

  1217. <a name="l01185"></a>01185           <span class="keywordflow">if</span>(<a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> &amp; UIP_EXT_HDR_BITMAP_DESTO2) {
    1218. 

  1218. <a name="l01186"></a>01186             <span class="keywordflow">goto</span> bad_hdr;
    1219. 

  1219. <a name="l01187"></a>01187           } <span class="keywordflow">else</span>{
    1220. 

  1220. <a name="l01188"></a>01188             <a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> |= UIP_EXT_HDR_BITMAP_DESTO2;
    1221. 

  1221. <a name="l01189"></a>01189           }
    1222. 

  1222. <a name="l01190"></a>01190         } <span class="keywordflow">else</span> {
    1223. 

  1223. <a name="l01191"></a>01191           <a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> |= UIP_EXT_HDR_BITMAP_DESTO1;
    1224. 

  1224. <a name="l01192"></a>01192         }
    1225. 

  1225. <a name="l01193"></a>01193 <span class="preprocessor">#endif </span><span class="comment">/*UIP_CONF_IPV6_CHECKS*/</span>
    1226. 

  1226. <a name="l01194"></a>01194         <span class="keywordflow">switch</span>(ext_hdr_options_process()) {
    1227. 

  1227. <a name="l01195"></a>01195           <span class="keywordflow">case</span> 0:
    1228. 

  1228. <a name="l01196"></a>01196             <span class="comment">/*continue*/</span>
    1229. 

  1229. <a name="l01197"></a>01197             <a class="code" href="a01685.html#gaa605d238ba40e21d7200fe94d6abc46d" title="Type of the next header in IPv6 header or extension headers.">uip_next_hdr</a> = &amp;UIP_EXT_BUF-&gt;next;
    1230. 

  1230. <a name="l01198"></a>01198             <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> += (UIP_EXT_BUF-&gt;len &lt;&lt; 3) + 8;
    1231. 

  1231. <a name="l01199"></a>01199             <span class="keywordflow">break</span>;
    1232. 

  1232. <a name="l01200"></a>01200           <span class="keywordflow">case</span> 1:
    1233. 

  1233. <a name="l01201"></a>01201             <span class="comment">/*silently discard*/</span>
    1234. 

  1234. <a name="l01202"></a>01202             <span class="keywordflow">goto</span> drop;
    1235. 

  1235. <a name="l01203"></a>01203           <span class="keywordflow">case</span> 2:
    1236. 

  1236. <a name="l01204"></a>01204             <span class="comment">/* send icmp error message (created in ext_hdr_options_process)</span>
    1237. 

  1237. <a name="l01205"></a>01205 <span class="comment">             * and discard*/</span>
    1238. 

  1238. <a name="l01206"></a>01206             <span class="keywordflow">goto</span> send;
    1239. 

  1239. <a name="l01207"></a>01207         }
    1240. 

  1240. <a name="l01208"></a>01208         <span class="keywordflow">break</span>;
    1241. 

  1241. <a name="l01209"></a>01209       <span class="keywordflow">case</span> UIP_PROTO_ROUTING:
    1242. 

  1242. <a name="l01210"></a>01210 <span class="preprocessor">#if UIP_CONF_IPV6_CHECKS</span>
    1243. 

  1243. <a name="l01211"></a>01211 <span class="preprocessor"></span>        <span class="comment">/* Routing header. If we saw one already, drop */</span>
    1244. 

  1244. <a name="l01212"></a>01212         <span class="keywordflow">if</span>(<a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> &amp; UIP_EXT_HDR_BITMAP_ROUTING) {
    1245. 

  1245. <a name="l01213"></a>01213           <span class="keywordflow">goto</span> bad_hdr;
    1246. 

  1246. <a name="l01214"></a>01214         } <span class="keywordflow">else</span> {
    1247. 

  1247. <a name="l01215"></a>01215           <a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> |= UIP_EXT_HDR_BITMAP_ROUTING;
    1248. 

  1248. <a name="l01216"></a>01216         }
    1249. 

  1249. <a name="l01217"></a>01217 <span class="preprocessor">#endif </span><span class="comment">/*UIP_CONF_IPV6_CHECKS*/</span>
    1250. 

  1250. <a name="l01218"></a>01218         <span class="comment">/*</span>
    1251. 

  1251. <a name="l01219"></a>01219 <span class="comment">         * Routing Header  length field is in units of 8 bytes, excluding</span>
    1252. 

  1252. <a name="l01220"></a>01220 <span class="comment">         * As per RFC2460 section 4.4, if routing type is unrecognized:</span>
    1253. 

  1253. <a name="l01221"></a>01221 <span class="comment">         * if segments left = 0, ignore the header</span>
    1254. 

  1254. <a name="l01222"></a>01222 <span class="comment">         * if segments left &gt; 0, discard packet and send icmp error pointing</span>
    1255. 

  1255. <a name="l01223"></a>01223 <span class="comment">         * to the routing type</span>
    1256. 

  1256. <a name="l01224"></a>01224 <span class="comment">         */</span>
    1257. 

  1257. <a name="l01225"></a>01225 
    1258. 

  1258. <a name="l01226"></a>01226         PRINTF(<span class="stringliteral">&quot;Processing Routing header\n&quot;</span>);
    1259. 

  1259. <a name="l01227"></a>01227         <span class="keywordflow">if</span>(UIP_ROUTING_BUF-&gt;seg_left &gt; 0) {
    1260. 

  1260. <a name="l01228"></a>01228           <a class="code" href="a01685.html#ga4dea30e31d7780ea39872320f665fcb5" title="Send an icmpv6 error message.">uip_icmp6_error_output</a>(<a class="code" href="a01685.html#ga8d80ba426cf5f5d177e7464c8076b62a" title="ip6 header bad">ICMP6_PARAM_PROB</a>, <a class="code" href="a01685.html#gae1dd9cc2c5f466eeb157320e65faba79" title="erroneous header field">ICMP6_PARAMPROB_HEADER</a>, UIP_IPH_LEN + <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> + 2);
    1261. 

  1261. <a name="l01229"></a>01229           <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
    1262. 

  1262. <a name="l01230"></a>01230           UIP_LOG(<span class="stringliteral">&quot;ip6: unrecognized routing type&quot;</span>);
    1263. 

  1263. <a name="l01231"></a>01231           <span class="keywordflow">goto</span> send;
    1264. 

  1264. <a name="l01232"></a>01232         }
    1265. 

  1265. <a name="l01233"></a>01233         <a class="code" href="a01685.html#gaa605d238ba40e21d7200fe94d6abc46d" title="Type of the next header in IPv6 header or extension headers.">uip_next_hdr</a> = &amp;UIP_EXT_BUF-&gt;next;
    1266. 

  1266. <a name="l01234"></a>01234         <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> += (UIP_EXT_BUF-&gt;len &lt;&lt; 3) + 8;
    1267. 

  1267. <a name="l01235"></a>01235         <span class="keywordflow">break</span>;
    1268. 

  1268. <a name="l01236"></a>01236       <span class="keywordflow">case</span> UIP_PROTO_FRAG:
    1269. 

  1269. <a name="l01237"></a>01237         <span class="comment">/* Fragmentation header:call the reassembly function, then leave */</span>
    1270. 

  1270. <a name="l01238"></a>01238 <span class="preprocessor">#if UIP_CONF_IPV6_REASSEMBLY</span>
    1271. 

  1271. <a name="l01239"></a>01239 <span class="preprocessor"></span>        PRINTF(<span class="stringliteral">&quot;Processing frag header\n&quot;</span>);
    1272. 

  1272. <a name="l01240"></a>01240         <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = uip_reass();
    1273. 

  1273. <a name="l01241"></a>01241         <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) {
    1274. 

  1274. <a name="l01242"></a>01242           <span class="keywordflow">goto</span> drop;
    1275. 

  1275. <a name="l01243"></a>01243         }
    1276. 

  1276. <a name="l01244"></a>01244         <span class="keywordflow">if</span>(uip_reassflags &amp; UIP_REASS_FLAG_ERROR_MSG){
    1277. 

  1277. <a name="l01245"></a>01245           <span class="comment">/* we are not done with reassembly, this is an error message */</span>
    1278. 

  1278. <a name="l01246"></a>01246           <span class="keywordflow">goto</span> send;
    1279. 

  1279. <a name="l01247"></a>01247         }
    1280. 

  1280. <a name="l01248"></a>01248         <span class="comment">/*packet is reassembled, reset the next hdr to the beginning</span>
    1281. 

  1281. <a name="l01249"></a>01249 <span class="comment">           of the IP header and restart the parsing of the reassembled pkt*/</span>
    1282. 

  1282. <a name="l01250"></a>01250         PRINTF(<span class="stringliteral">&quot;Processing reassembled packet\n&quot;</span>);
    1283. 

  1283. <a name="l01251"></a>01251         <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> = 0;
    1284. 

  1284. <a name="l01252"></a>01252         <a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> = 0;
    1285. 

  1285. <a name="l01253"></a>01253         <a class="code" href="a01685.html#gaa605d238ba40e21d7200fe94d6abc46d" title="Type of the next header in IPv6 header or extension headers.">uip_next_hdr</a> = &amp;<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;proto;
    1286. 

  1286. <a name="l01254"></a>01254         <span class="keywordflow">break</span>;
    1287. 

  1287. <a name="l01255"></a>01255 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6_REASSEMBLY */</span>
    1288. 

  1288. <a name="l01256"></a>01256         <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
    1289. 

  1289. <a name="l01257"></a>01257         <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.fragerr);
    1290. 

  1290. <a name="l01258"></a>01258         UIP_LOG(<span class="stringliteral">&quot;ip: fragment dropped.&quot;</span>);
    1291. 

  1291. <a name="l01259"></a>01259         <span class="keywordflow">goto</span> drop;
    1292. 

  1292. <a name="l01260"></a>01260 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6_REASSEMBLY */</span>
    1293. 

  1293. <a name="l01261"></a>01261       <span class="keywordflow">case</span> UIP_PROTO_NONE:
    1294. 

  1294. <a name="l01262"></a>01262         <span class="keywordflow">goto</span> drop;
    1295. 

  1295. <a name="l01263"></a>01263       <span class="keywordflow">default</span>:
    1296. 

  1296. <a name="l01264"></a>01264         <span class="keywordflow">goto</span> bad_hdr;
    1297. 

  1297. <a name="l01265"></a>01265     }
    1298. 

  1298. <a name="l01266"></a>01266   }
    1299. 

  1299. <a name="l01267"></a>01267   bad_hdr:
    1300. 

  1300. <a name="l01268"></a>01268   <span class="comment">/*</span>
    1301. 

  1301. <a name="l01269"></a>01269 <span class="comment">   * RFC 2460 send error message parameterr problem, code unrecognized</span>
    1302. 

  1302. <a name="l01270"></a>01270 <span class="comment">   * next header, pointing to the next header field</span>
    1303. 

  1303. <a name="l01271"></a>01271 <span class="comment">   */</span>
    1304. 

  1304. <a name="l01272"></a>01272   <a class="code" href="a01685.html#ga4dea30e31d7780ea39872320f665fcb5" title="Send an icmpv6 error message.">uip_icmp6_error_output</a>(<a class="code" href="a01685.html#ga8d80ba426cf5f5d177e7464c8076b62a" title="ip6 header bad">ICMP6_PARAM_PROB</a>, <a class="code" href="a01685.html#gad82c600ff1d118554029c9258e014966" title="unrecognized next header">ICMP6_PARAMPROB_NEXTHEADER</a>, (<a class="code" href="a01668.html#ga4c14294869aceba3ef9d4c0c302d0f33" title="The 32-bit unsigned data type.">u32_t</a>)(<a class="code" href="a01685.html#gaa605d238ba40e21d7200fe94d6abc46d" title="Type of the next header in IPv6 header or extension headers.">uip_next_hdr</a> - (uint8_t *)<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>));
    1305. 

  1305. <a name="l01273"></a>01273   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
    1306. 

  1306. <a name="l01274"></a>01274   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.protoerr);
    1307. 

  1307. <a name="l01275"></a>01275   UIP_LOG(<span class="stringliteral">&quot;ip6: unrecognized header&quot;</span>);
    1308. 

  1308. <a name="l01276"></a>01276   <span class="keywordflow">goto</span> send;
    1309. 

  1309. <a name="l01277"></a>01277   <span class="comment">/* End of headers processing */</span>
    1310. 

  1310. <a name="l01278"></a>01278   
    1311. 

  1311. <a name="l01279"></a>01279   icmp6_input:
    1312. 

  1312. <a name="l01280"></a>01280   <span class="comment">/* This is IPv6 ICMPv6 processing code. */</span>
    1313. 

  1313. <a name="l01281"></a>01281   PRINTF(<span class="stringliteral">&quot;icmp6_input: length %d\n&quot;</span>, <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>);
    1314. 

  1314. <a name="l01282"></a>01282 
    1315. 

  1315. <a name="l01283"></a>01283 <span class="preprocessor">#if UIP_CONF_IPV6_CHECKS</span>
    1316. 

  1316. <a name="l01284"></a>01284 <span class="preprocessor"></span>  <span class="comment">/* Compute and check the ICMP header checksum */</span>
    1317. 

  1317. <a name="l01285"></a>01285   <span class="keywordflow">if</span>(<a class="code" href="a01684.html#ga5e6741b8bd3e0961fb87e3f85da27a7f" title="Calculate the ICMP checksum of the packet in uip_buf.">uip_icmp6chksum</a>() != 0xffff) {
    1318. 

  1318. <a name="l01286"></a>01286     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.drop);
    1319. 

  1319. <a name="l01287"></a>01287     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.chkerr);
    1320. 

  1320. <a name="l01288"></a>01288     UIP_LOG(<span class="stringliteral">&quot;icmpv6: bad checksum.&quot;</span>);
    1321. 

  1321. <a name="l01289"></a>01289     <span class="keywordflow">goto</span> drop;
    1322. 

  1322. <a name="l01290"></a>01290   }
    1323. 

  1323. <a name="l01291"></a>01291 <span class="preprocessor">#endif </span><span class="comment">/*UIP_CONF_IPV6_CHECKS*/</span>
    1324. 

  1324. <a name="l01292"></a>01292 
    1325. 

  1325. <a name="l01293"></a>01293   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.recv);
    1326. 

  1326. <a name="l01294"></a>01294   <span class="comment">/*</span>
    1327. 

  1327. <a name="l01295"></a>01295 <span class="comment">   * Here we process incoming ICMPv6 packets</span>
    1328. 

  1328. <a name="l01296"></a>01296 <span class="comment">   * For echo request, we send echo reply</span>
    1329. 

  1329. <a name="l01297"></a>01297 <span class="comment">   * For ND pkts, we call the appropriate function in uip-nd6.c</span>
    1330. 

  1330. <a name="l01298"></a>01298 <span class="comment">   * We do not treat Error messages for now</span>
    1331. 

  1331. <a name="l01299"></a>01299 <span class="comment">   * If no pkt is to be sent as an answer to the incoming one, we</span>
    1332. 

  1332. <a name="l01300"></a>01300 <span class="comment">   * &quot;goto drop&quot;. Else we just break; then at the after the &quot;switch&quot;</span>
    1333. 

  1333. <a name="l01301"></a>01301 <span class="comment">   * we &quot;goto send&quot;</span>
    1334. 

  1334. <a name="l01302"></a>01302 <span class="comment">   */</span>
    1335. 

  1335. <a name="l01303"></a>01303 <span class="preprocessor">#if UIP_CONF_ICMP6</span>
    1336. 

  1336. <a name="l01304"></a>01304 <span class="preprocessor"></span>  UIP_ICMP6_APPCALL(<a class="code" href="a01685.html#ga56e76f46008562daae1447c012fd92e2" title="Pointer to ICMP header.">UIP_ICMP_BUF</a>-&gt;type);
    1337. 

  1337. <a name="l01305"></a>01305 <span class="preprocessor">#endif </span><span class="comment">/*UIP_CONF_ICMP6*/</span>
    1338. 

  1338. <a name="l01306"></a>01306 
    1339. 

  1339. <a name="l01307"></a>01307   <span class="keywordflow">switch</span>(<a class="code" href="a01685.html#ga56e76f46008562daae1447c012fd92e2" title="Pointer to ICMP header.">UIP_ICMP_BUF</a>-&gt;type) {
    1340. 

  1340. <a name="l01308"></a>01308     <span class="keywordflow">case</span> <a class="code" href="a01685.html#ga57a1ac6d8a0a481176f3003a0e1ad629" title="Neighbor Solicitation.">ICMP6_NS</a>:
    1341. 

  1341. <a name="l01309"></a>01309       <a class="code" href="a01685.html#gae79fcc7ce6cca2ba75d940f1c4f412b0" title="Process a neighbor solicitation.">uip_nd6_ns_input</a>();
    1342. 

  1342. <a name="l01310"></a>01310       <span class="keywordflow">break</span>;
    1343. 

  1343. <a name="l01311"></a>01311     <span class="keywordflow">case</span> <a class="code" href="a01685.html#ga83d62d3e140863ae8cc314657b2502c2" title="Neighbor advertisement.">ICMP6_NA</a>:
    1344. 

  1344. <a name="l01312"></a>01312       <a class="code" href="a01685.html#ga1e60994806633470ed48b3610ef36ef9" title="Process a Neighbor Advertisement.">uip_nd6_na_input</a>();
    1345. 

  1345. <a name="l01313"></a>01313       <span class="keywordflow">break</span>;
    1346. 

  1346. <a name="l01314"></a>01314     <span class="keywordflow">case</span> <a class="code" href="a01685.html#gaa52eca388b7196c057a94380ebc5af11" title="Router Solicitation.">ICMP6_RS</a>:
    1347. 

  1347. <a name="l01315"></a>01315 <span class="preprocessor">#if UIP_CONF_ROUTER &amp;&amp; UIP_ND6_SEND_RA</span>
    1348. 

  1348. <a name="l01316"></a>01316 <span class="preprocessor"></span>    uip_nd6_rs_input();
    1349. 

  1349. <a name="l01317"></a>01317 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_ROUTER &amp;&amp; UIP_ND6_SEND_RA */</span>
    1350. 

  1350. <a name="l01318"></a>01318     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.drop);
    1351. 

  1351. <a name="l01319"></a>01319     <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 0;
    1352. 

  1352. <a name="l01320"></a>01320 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_ROUTER &amp;&amp; UIP_ND6_SEND_RA */</span>
    1353. 

  1353. <a name="l01321"></a>01321     <span class="keywordflow">break</span>;
    1354. 

  1354. <a name="l01322"></a>01322   <span class="keywordflow">case</span> <a class="code" href="a01685.html#gae6bd456160b928ad8b9c17473a864f3f" title="Router Advertisement.">ICMP6_RA</a>:
    1355. 

  1355. <a name="l01323"></a>01323 <span class="preprocessor">#if UIP_CONF_ROUTER</span>
    1356. 

  1356. <a name="l01324"></a>01324 <span class="preprocessor"></span>    <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.drop);
    1357. 

  1357. <a name="l01325"></a>01325     <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 0;
    1358. 

  1358. <a name="l01326"></a>01326 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_ROUTER */</span>
    1359. 

  1359. <a name="l01327"></a>01327     <a class="code" href="a01685.html#ga38d101ca67e53122583f6b9a81debe29" title="process a Router Advertisement">uip_nd6_ra_input</a>();
    1360. 

  1360. <a name="l01328"></a>01328 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_ROUTER */</span>
    1361. 

  1361. <a name="l01329"></a>01329     <span class="keywordflow">break</span>;
    1362. 

  1362. <a name="l01330"></a>01330 <span class="preprocessor">#if UIP_CONF_IPV6_RPL</span>
    1363. 

  1363. <a name="l01331"></a>01331 <span class="preprocessor"></span>  <span class="keywordflow">case</span> <a class="code" href="a01685.html#gaca4ac7f4ff2d4e8083b68896b0611c10" title="RPL.">ICMP6_RPL</a>:
    1364. 

  1364. <a name="l01332"></a>01332     uip_rpl_input();
    1365. 

  1365. <a name="l01333"></a>01333     <span class="keywordflow">break</span>;
    1366. 

  1366. <a name="l01334"></a>01334 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6_RPL */</span>
    1367. 

  1367. <a name="l01335"></a>01335     <span class="keywordflow">case</span> <a class="code" href="a01685.html#gaf57992c702020d846f7e50511fb30a8c" title="Echo request.">ICMP6_ECHO_REQUEST</a>:
    1368. 

  1368. <a name="l01336"></a>01336       <a class="code" href="a01685.html#ga1cd1acc7b65238c4d6c6d8f812d46068" title="\ brief Process an echo request">uip_icmp6_echo_request_input</a>();
    1369. 

  1369. <a name="l01337"></a>01337       <span class="keywordflow">break</span>;
    1370. 

  1370. <a name="l01338"></a>01338     <span class="keywordflow">case</span> <a class="code" href="a01685.html#ga207d17b633cd095120a74bc1f2257b17" title="Echo reply.">ICMP6_ECHO_REPLY</a>:<span class="comment"></span>
    1371. 

  1371. <a name="l01339"></a>01339 <span class="comment">      /** \note We don&apos;t implement any application callback for now */</span>
    1372. 

  1372. <a name="l01340"></a>01340       PRINTF(<span class="stringliteral">&quot;Received an icmp6 echo reply\n&quot;</span>);
    1373. 

  1373. <a name="l01341"></a>01341       <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.recv);
    1374. 

  1374. <a name="l01342"></a>01342       <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 0;
    1375. 

  1375. <a name="l01343"></a>01343       <span class="keywordflow">break</span>;
    1376. 

  1376. <a name="l01344"></a>01344     <span class="keywordflow">default</span>:
    1377. 

  1377. <a name="l01345"></a>01345       PRINTF(<span class="stringliteral">&quot;Unknown icmp6 message type %d\n&quot;</span>, <a class="code" href="a01685.html#ga56e76f46008562daae1447c012fd92e2" title="Pointer to ICMP header.">UIP_ICMP_BUF</a>-&gt;type);
    1378. 

  1378. <a name="l01346"></a>01346       <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.drop);
    1379. 

  1379. <a name="l01347"></a>01347       <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.icmp.typeerr);
    1380. 

  1380. <a name="l01348"></a>01348       UIP_LOG(<span class="stringliteral">&quot;icmp6: unknown ICMP message.&quot;</span>);
    1381. 

  1381. <a name="l01349"></a>01349       <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 0;
    1382. 

  1382. <a name="l01350"></a>01350       <span class="keywordflow">break</span>;
    1383. 

  1383. <a name="l01351"></a>01351   }
    1384. 

  1384. <a name="l01352"></a>01352   
    1385. 

  1385. <a name="l01353"></a>01353   <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> &gt; 0) {
    1386. 

  1386. <a name="l01354"></a>01354     <span class="keywordflow">goto</span> send;
    1387. 

  1387. <a name="l01355"></a>01355   } <span class="keywordflow">else</span> {
    1388. 

  1388. <a name="l01356"></a>01356     <span class="keywordflow">goto</span> drop;
    1389. 

  1389. <a name="l01357"></a>01357   }
    1390. 

  1390. <a name="l01358"></a>01358   <span class="comment">/* End of IPv6 ICMP processing. */</span>
    1391. 

  1391. <a name="l01359"></a>01359    
    1392. 

  1392. <a name="l01360"></a>01360 
    1393. 

  1393. <a name="l01361"></a>01361 <span class="preprocessor">#if UIP_UDP</span>
    1394. 

  1394. <a name="l01362"></a>01362 <span class="preprocessor"></span>  <span class="comment">/* UDP input processing. */</span>
    1395. 

  1395. <a name="l01363"></a>01363  udp_input:
    1396. 

  1396. <a name="l01364"></a>01364   PRINTF(<span class="stringliteral">&quot;Receiving UDP packet\n&quot;</span>);
    1397. 

  1397. <a name="l01365"></a>01365   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.udp.recv);
    1398. 

  1398. <a name="l01366"></a>01366  
    1399. 

  1399. <a name="l01367"></a>01367   <span class="comment">/* UDP processing is really just a hack. We don&apos;t do anything to the</span>
    1400. 

  1400. <a name="l01368"></a>01368 <span class="comment">     UDP/IP headers, but let the UDP application do all the hard</span>
    1401. 

  1401. <a name="l01369"></a>01369 <span class="comment">     work. If the application sets uip_slen, it has a packet to</span>
    1402. 

  1402. <a name="l01370"></a>01370 <span class="comment">     send. */</span>
    1403. 

  1403. <a name="l01371"></a>01371 <span class="preprocessor">#if UIP_UDP_CHECKSUMS</span>
    1404. 

  1404. <a name="l01372"></a>01372 <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;
    1405. 

  1405. <a name="l01373"></a>01373   <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = &amp;uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + UIP_IPUDPH_LEN];
    1406. 

  1406. <a name="l01374"></a>01374   <span class="keywordflow">if</span>(UIP_UDP_BUF-&gt;udpchksum != 0 &amp;&amp; <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) {
    1407. 

  1407. <a name="l01375"></a>01375     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.udp.drop);
    1408. 

  1408. <a name="l01376"></a>01376     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.udp.chkerr);
    1409. 

  1409. <a name="l01377"></a>01377     PRINTF(<span class="stringliteral">&quot;udp: bad checksum 0x%04x 0x%04x\n&quot;</span>, UIP_UDP_BUF-&gt;udpchksum,
    1410. 

  1410. <a name="l01378"></a>01378            <a class="code" href="a01684.html#ga7023a34ba9e9d03b5fbedbcb32924453" title="Calculate the UDP checksum of the packet in uip_buf and uip_appdata.">uip_udpchksum</a>());
    1411. 

  1411. <a name="l01379"></a>01379     <span class="keywordflow">goto</span> drop;
    1412. 

  1412. <a name="l01380"></a>01380   }
    1413. 

  1413. <a name="l01381"></a>01381 <span class="preprocessor">#else </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
    1414. 

  1414. <a name="l01382"></a>01382   <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;
    1415. 

  1415. <a name="l01383"></a>01383 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
    1416. 

  1416. <a name="l01384"></a>01384 
    1417. 

  1417. <a name="l01385"></a>01385   <span class="comment">/* Make sure that the UDP destination port number is not zero. */</span>
    1418. 

  1418. <a name="l01386"></a>01386   <span class="keywordflow">if</span>(UIP_UDP_BUF-&gt;destport == 0) {
    1419. 

  1419. <a name="l01387"></a>01387     PRINTF(<span class="stringliteral">&quot;udp: zero port.\n&quot;</span>);
    1420. 

  1420. <a name="l01388"></a>01388     <span class="keywordflow">goto</span> drop;
    1421. 

  1421. <a name="l01389"></a>01389   }
    1422. 

  1422. <a name="l01390"></a>01390 
    1423. 

  1423. <a name="l01391"></a>01391   <span class="comment">/* Demultiplex this UDP packet between the UDP &quot;connections&quot;. */</span>
    1424. 

  1424. <a name="l01392"></a>01392   <span class="keywordflow">for</span>(uip_udp_conn = &amp;uip_udp_conns[0];
    1425. 

  1425. <a name="l01393"></a>01393       uip_udp_conn &lt; &amp;uip_udp_conns[<a class="code" href="a01584.html#ga196379ceb1219a99f4495e41ccc9bbfb" title="The maximum amount of concurrent UDP connections.">UIP_UDP_CONNS</a>];
    1426. 

  1426. <a name="l01394"></a>01394       ++uip_udp_conn) {
    1427. 

  1427. <a name="l01395"></a>01395     <span class="comment">/* If the local UDP port is non-zero, the connection is considered</span>
    1428. 

  1428. <a name="l01396"></a>01396 <span class="comment">       to be used. If so, the local port number is checked against the</span>
    1429. 

  1429. <a name="l01397"></a>01397 <span class="comment">       destination port number in the received packet. If the two port</span>
    1430. 

  1430. <a name="l01398"></a>01398 <span class="comment">       numbers match, the remote port number is checked if the</span>
    1431. 

  1431. <a name="l01399"></a>01399 <span class="comment">       connection is bound to a remote port. Finally, if the</span>
    1432. 

  1432. <a name="l01400"></a>01400 <span class="comment">       connection is bound to a remote IP address, the source IP</span>
    1433. 

  1433. <a name="l01401"></a>01401 <span class="comment">       address of the packet is checked. */</span>
    1434. 

  1434. <a name="l01402"></a>01402     <span class="keywordflow">if</span>(uip_udp_conn-&gt;<a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> != 0 &amp;&amp;
    1435. 

  1435. <a name="l01403"></a>01403        UIP_UDP_BUF-&gt;destport == uip_udp_conn-&gt;<a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a> &amp;&amp;
    1436. 

  1436. <a name="l01404"></a>01404        (uip_udp_conn-&gt;<a class="code" href="a00119.html#a280a0c2a93544e597f92bbacf36ee1dc" title="The remote port number in network byte order.">rport</a> == 0 ||
    1437. 

  1437. <a name="l01405"></a>01405         UIP_UDP_BUF-&gt;srcport == uip_udp_conn-&gt;<a class="code" href="a00119.html#a280a0c2a93544e597f92bbacf36ee1dc" title="The remote port number in network byte order.">rport</a>) &amp;&amp;
    1438. 

  1438. <a name="l01406"></a>01406        (uip_is_addr_unspecified(&amp;uip_udp_conn-&gt;<a class="code" href="a00119.html#a8a661a2d544100b82d0d14a1985083d5" title="The IP address of the remote peer.">ripaddr</a>) ||
    1439. 

  1439. <a name="l01407"></a>01407         <a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&amp;UIP_IP_BUF-&gt;srcipaddr, &amp;uip_udp_conn-&gt;<a class="code" href="a00119.html#a8a661a2d544100b82d0d14a1985083d5" title="The IP address of the remote peer.">ripaddr</a>))) {
    1440. 

  1440. <a name="l01408"></a>01408       <span class="keywordflow">goto</span> udp_found;
    1441. 

  1441. <a name="l01409"></a>01409     }
    1442. 

  1442. <a name="l01410"></a>01410   }
    1443. 

  1443. <a name="l01411"></a>01411   PRINTF(<span class="stringliteral">&quot;udp: no matching connection found\n&quot;</span>);
    1444. 

  1444. <a name="l01412"></a>01412 
    1445. 

  1445. <a name="l01413"></a>01413 <span class="preprocessor">#if UIP_UDP_SEND_UNREACH_NOPORT</span>
    1446. 

  1446. <a name="l01414"></a>01414 <span class="preprocessor"></span>  <a class="code" href="a01685.html#ga4dea30e31d7780ea39872320f665fcb5" title="Send an icmpv6 error message.">uip_icmp6_error_output</a>(<a class="code" href="a01685.html#ga24a92fa6c87bf49df9c7afbf3b7137f2" title="dest unreachable">ICMP6_DST_UNREACH</a>, <a class="code" href="a01685.html#ga922cb86597072bd79bd099a13b2607c5" title="port unreachable">ICMP6_DST_UNREACH_NOPORT</a>, 0);
    1447. 

  1447. <a name="l01415"></a>01415   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.drop);
    1448. 

  1448. <a name="l01416"></a>01416   <span class="keywordflow">goto</span> send;
    1449. 

  1449. <a name="l01417"></a>01417 <span class="preprocessor">#else</span>
    1450. 

  1450. <a name="l01418"></a>01418 <span class="preprocessor"></span>  <span class="keywordflow">goto</span> drop;
    1451. 

  1451. <a name="l01419"></a>01419 <span class="preprocessor">#endif</span>
    1452. 

  1452. <a name="l01420"></a>01420 <span class="preprocessor"></span>
    1453. 

  1453. <a name="l01421"></a>01421  udp_found:
    1454. 

  1454. <a name="l01422"></a>01422   PRINTF(<span class="stringliteral">&quot;In udp_found\n&quot;</span>);
    1455. 

  1455. <a name="l01423"></a>01423  
    1456. 

  1456. <a name="l01424"></a>01424   uip_conn = NULL;
    1457. 

  1457. <a name="l01425"></a>01425   uip_flags = UIP_NEWDATA;
    1458. 

  1458. <a name="l01426"></a>01426   uip_sappdata = <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = &amp;uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + UIP_IPUDPH_LEN];
    1459. 

  1459. <a name="l01427"></a>01427   uip_slen = 0;
    1460. 

  1460. <a name="l01428"></a>01428   UIP_UDP_APPCALL();
    1461. 

  1461. <a name="l01429"></a>01429 
    1462. 

  1462. <a name="l01430"></a>01430  udp_send:
    1463. 

  1463. <a name="l01431"></a>01431   PRINTF(<span class="stringliteral">&quot;In udp_send\n&quot;</span>);
    1464. 

  1464. <a name="l01432"></a>01432 
    1465. 

  1465. <a name="l01433"></a>01433   <span class="keywordflow">if</span>(uip_slen == 0) {
    1466. 

  1466. <a name="l01434"></a>01434     <span class="keywordflow">goto</span> drop;
    1467. 

  1467. <a name="l01435"></a>01435   }
    1468. 

  1468. <a name="l01436"></a>01436   <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;
    1469. 

  1469. <a name="l01437"></a>01437 
    1470. 

  1470. <a name="l01438"></a>01438   <span class="comment">/* For IPv6, the IP length field does not include the IPv6 IP header</span>
    1471. 

  1471. <a name="l01439"></a>01439 <span class="comment">     length. */</span>
    1472. 

  1472. <a name="l01440"></a>01440   UIP_IP_BUF-&gt;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) &gt;&gt; 8);
    1473. 

  1473. <a name="l01441"></a>01441   UIP_IP_BUF-&gt;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) &amp; 0xff);
    1474. 

  1474. <a name="l01442"></a>01442 
    1475. 

  1475. <a name="l01443"></a>01443   UIP_IP_BUF-&gt;ttl = uip_udp_conn-&gt;<a class="code" href="a00119.html#a4da1d7815516cd2b5bda3a66fdf05198" title="Default time-to-live.">ttl</a>;
    1476. 

  1476. <a name="l01444"></a>01444   UIP_IP_BUF-&gt;proto = UIP_PROTO_UDP;
    1477. 

  1477. <a name="l01445"></a>01445 
    1478. 

  1478. <a name="l01446"></a>01446   UIP_UDP_BUF-&gt;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);
    1479. 

  1479. <a name="l01447"></a>01447   UIP_UDP_BUF-&gt;udpchksum = 0;
    1480. 

  1480. <a name="l01448"></a>01448 
    1481. 

  1481. <a name="l01449"></a>01449   UIP_UDP_BUF-&gt;srcport  = uip_udp_conn-&gt;<a class="code" href="a00119.html#a981392e295db4d024eea95805c51c371" title="The local port number in network byte order.">lport</a>;
    1482. 

  1482. <a name="l01450"></a>01450   UIP_UDP_BUF-&gt;destport = uip_udp_conn-&gt;<a class="code" href="a00119.html#a280a0c2a93544e597f92bbacf36ee1dc" title="The remote port number in network byte order.">rport</a>;
    1483. 

  1483. <a name="l01451"></a>01451 
    1484. 

  1484. <a name="l01452"></a>01452   <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&amp;UIP_IP_BUF-&gt;destipaddr, &amp;uip_udp_conn-&gt;<a class="code" href="a00119.html#a8a661a2d544100b82d0d14a1985083d5" title="The IP address of the remote peer.">ripaddr</a>);
    1485. 

  1485. <a name="l01453"></a>01453   <a class="code" href="a01685.html#gab4be25c579b63df6ce5b3a0d8b067b27" title="Source address selection, see RFC 3484.">uip_ds6_select_src</a>(&amp;UIP_IP_BUF-&gt;srcipaddr, &amp;UIP_IP_BUF-&gt;destipaddr);
    1486. 

  1486. <a name="l01454"></a>01454 
    1487. 

  1487. <a name="l01455"></a>01455   <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = &amp;uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + UIP_IPTCPH_LEN];
    1488. 

  1488. <a name="l01456"></a>01456 
    1489. 

  1489. <a name="l01457"></a>01457 <span class="preprocessor">#if UIP_UDP_CHECKSUMS</span>
    1490. 

  1490. <a name="l01458"></a>01458 <span class="preprocessor"></span>  <span class="comment">/* Calculate UDP checksum. */</span>
    1491. 

  1491. <a name="l01459"></a>01459   UIP_UDP_BUF-&gt;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>());
    1492. 

  1492. <a name="l01460"></a>01460   <span class="keywordflow">if</span>(UIP_UDP_BUF-&gt;udpchksum == 0) {
    1493. 

  1493. <a name="l01461"></a>01461     UIP_UDP_BUF-&gt;udpchksum = 0xffff;
    1494. 

  1494. <a name="l01462"></a>01462   }
    1495. 

  1495. <a name="l01463"></a>01463 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
    1496. 

  1496. <a name="l01464"></a>01464   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.udp.sent);
    1497. 

  1497. <a name="l01465"></a>01465   <span class="keywordflow">goto</span> ip_send_nolen;
    1498. 

  1498. <a name="l01466"></a>01466 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
    1499. 

  1499. <a name="l01467"></a>01467 
    1500. 

  1500. <a name="l01468"></a>01468 <span class="preprocessor">#if UIP_TCP</span>
    1501. 

  1501. <a name="l01469"></a>01469 <span class="preprocessor"></span>  <span class="comment">/* TCP input processing. */</span>
    1502. 

  1502. <a name="l01470"></a>01470  tcp_input:
    1503. 

  1503. <a name="l01471"></a>01471 
    1504. 

  1504. <a name="l01472"></a>01472   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.recv);
    1505. 

  1505. <a name="l01473"></a>01473   PRINTF(<span class="stringliteral">&quot;Receiving TCP packet\n&quot;</span>);
    1506. 

  1506. <a name="l01474"></a>01474   <span class="comment">/* Start of TCP input header processing code. */</span>
    1507. 

  1507. <a name="l01475"></a>01475   
    1508. 

  1508. <a name="l01476"></a>01476   <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>
    1509. 

  1509. <a name="l01477"></a>01477 <span class="comment">                                       checksum. */</span>
    1510. 

  1510. <a name="l01478"></a>01478     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.drop);
    1511. 

  1511. <a name="l01479"></a>01479     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.chkerr);
    1512. 

  1512. <a name="l01480"></a>01480     UIP_LOG(<span class="stringliteral">&quot;tcp: bad checksum.&quot;</span>);
    1513. 

  1513. <a name="l01481"></a>01481     <span class="keywordflow">goto</span> drop;
    1514. 

  1514. <a name="l01482"></a>01482   }
    1515. 

  1515. <a name="l01483"></a>01483 
    1516. 

  1516. <a name="l01484"></a>01484   <span class="comment">/* Make sure that the TCP port number is not zero. */</span>
    1517. 

  1517. <a name="l01485"></a>01485   <span class="keywordflow">if</span>(UIP_TCP_BUF-&gt;destport == 0 || UIP_TCP_BUF-&gt;srcport == 0) {
    1518. 

  1518. <a name="l01486"></a>01486     UIP_LOG(<span class="stringliteral">&quot;tcp: zero port.&quot;</span>);
    1519. 

  1519. <a name="l01487"></a>01487     <span class="keywordflow">goto</span> drop;
    1520. 

  1520. <a name="l01488"></a>01488   }
    1521. 

  1521. <a name="l01489"></a>01489 
    1522. 

  1522. <a name="l01490"></a>01490   <span class="comment">/* Demultiplex this segment. */</span>
    1523. 

  1523. <a name="l01491"></a>01491   <span class="comment">/* First check any active connections. */</span>
    1524. 

  1524. <a name="l01492"></a>01492   <span class="keywordflow">for</span>(uip_connr = &amp;uip_conns[0]; uip_connr &lt;= &amp;uip_conns[UIP_CONNS - 1];
    1525. 

  1525. <a name="l01493"></a>01493       ++uip_connr) {
    1526. 

  1526. <a name="l01494"></a>01494     <span class="keywordflow">if</span>(uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> != UIP_CLOSED &amp;&amp;
    1527. 

  1527. <a name="l01495"></a>01495        UIP_TCP_BUF-&gt;destport == uip_connr-&gt;<a class="code" href="a00092.html#a0cd09beee671e7e9efb0b4aced10249e" title="The local TCP port, in network byte order.">lport</a> &amp;&amp;
    1528. 

  1528. <a name="l01496"></a>01496        UIP_TCP_BUF-&gt;srcport == uip_connr-&gt;<a class="code" href="a00092.html#a1df6aa054ef2fa634ac4c6f418228285" title="The local remote TCP port, in network byte order.">rport</a> &amp;&amp;
    1529. 

  1529. <a name="l01497"></a>01497        <a class="code" href="a01576.html#ga210e629f7252e4bc8458cbdf260b3318" title="Compare two IP addresses.">uip_ipaddr_cmp</a>(&amp;UIP_IP_BUF-&gt;srcipaddr, &amp;uip_connr-&gt;<a class="code" href="a00092.html#a79510aa86d3fa0a0fc6cfc49b1da7279" title="The IP address of the remote host.">ripaddr</a>)) {
    1530. 

  1530. <a name="l01498"></a>01498       <span class="keywordflow">goto</span> found;
    1531. 

  1531. <a name="l01499"></a>01499     }
    1532. 

  1532. <a name="l01500"></a>01500   }
    1533. 

  1533. <a name="l01501"></a>01501 
    1534. 

  1534. <a name="l01502"></a>01502   <span class="comment">/* If we didn&apos;t find and active connection that expected the packet,</span>
    1535. 

  1535. <a name="l01503"></a>01503 <span class="comment">     either this packet is an old duplicate, or this is a SYN packet</span>
    1536. 

  1536. <a name="l01504"></a>01504 <span class="comment">     destined for a connection in LISTEN. If the SYN flag isn&apos;t set,</span>
    1537. 

  1537. <a name="l01505"></a>01505 <span class="comment">     it is an old packet and we send a RST. */</span>
    1538. 

  1538. <a name="l01506"></a>01506   <span class="keywordflow">if</span>((UIP_TCP_BUF-&gt;flags &amp; TCP_CTL) != TCP_SYN) {
    1539. 

  1539. <a name="l01507"></a>01507     <span class="keywordflow">goto</span> reset;
    1540. 

  1540. <a name="l01508"></a>01508   }
    1541. 

  1541. <a name="l01509"></a>01509   
    1542. 

  1542. <a name="l01510"></a>01510   tmp16 = UIP_TCP_BUF-&gt;destport;
    1543. 

  1543. <a name="l01511"></a>01511   <span class="comment">/* Next, check listening connections. */</span>
    1544. 

  1544. <a name="l01512"></a>01512   <span class="keywordflow">for</span>(c = 0; c &lt; UIP_LISTENPORTS; ++c) {
    1545. 

  1545. <a name="l01513"></a>01513     <span class="keywordflow">if</span>(tmp16 == uip_listenports[c]) {
    1546. 

  1546. <a name="l01514"></a>01514       <span class="keywordflow">goto</span> found_listen;
    1547. 

  1547. <a name="l01515"></a>01515     }
    1548. 

  1548. <a name="l01516"></a>01516   }
    1549. 

  1549. <a name="l01517"></a>01517   
    1550. 

  1550. <a name="l01518"></a>01518   <span class="comment">/* No matching connection found, so we send a RST packet. */</span>
    1551. 

  1551. <a name="l01519"></a>01519   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.synrst);
    1552. 

  1552. <a name="l01520"></a>01520 
    1553. 

  1553. <a name="l01521"></a>01521  reset:
    1554. 

  1554. <a name="l01522"></a>01522   PRINTF(<span class="stringliteral">&quot;In reset\n&quot;</span>);
    1555. 

  1555. <a name="l01523"></a>01523   <span class="comment">/* We do not send resets in response to resets. */</span>
    1556. 

  1556. <a name="l01524"></a>01524   <span class="keywordflow">if</span>(UIP_TCP_BUF-&gt;flags &amp; TCP_RST) {
    1557. 

  1557. <a name="l01525"></a>01525     <span class="keywordflow">goto</span> drop;
    1558. 

  1558. <a name="l01526"></a>01526   }
    1559. 

  1559. <a name="l01527"></a>01527 
    1560. 

  1560. <a name="l01528"></a>01528   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.rst);
    1561. 

  1561. <a name="l01529"></a>01529   
    1562. 

  1562. <a name="l01530"></a>01530   UIP_TCP_BUF-&gt;flags = TCP_RST | TCP_ACK;
    1563. 

  1563. <a name="l01531"></a>01531   <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = UIP_IPTCPH_LEN;
    1564. 

  1564. <a name="l01532"></a>01532   UIP_TCP_BUF-&gt;tcpoffset = 5 &lt;&lt; 4;
    1565. 

  1565. <a name="l01533"></a>01533 
    1566. 

  1566. <a name="l01534"></a>01534   <span class="comment">/* Flip the seqno and ackno fields in the TCP header. */</span>
    1567. 

  1567. <a name="l01535"></a>01535   c = UIP_TCP_BUF-&gt;seqno[3];
    1568. 

  1568. <a name="l01536"></a>01536   UIP_TCP_BUF-&gt;seqno[3] = UIP_TCP_BUF-&gt;ackno[3];
    1569. 

  1569. <a name="l01537"></a>01537   UIP_TCP_BUF-&gt;ackno[3] = c;
    1570. 

  1570. <a name="l01538"></a>01538   
    1571. 

  1571. <a name="l01539"></a>01539   c = UIP_TCP_BUF-&gt;seqno[2];
    1572. 

  1572. <a name="l01540"></a>01540   UIP_TCP_BUF-&gt;seqno[2] = UIP_TCP_BUF-&gt;ackno[2];
    1573. 

  1573. <a name="l01541"></a>01541   UIP_TCP_BUF-&gt;ackno[2] = c;
    1574. 

  1574. <a name="l01542"></a>01542   
    1575. 

  1575. <a name="l01543"></a>01543   c = UIP_TCP_BUF-&gt;seqno[1];
    1576. 

  1576. <a name="l01544"></a>01544   UIP_TCP_BUF-&gt;seqno[1] = UIP_TCP_BUF-&gt;ackno[1];
    1577. 

  1577. <a name="l01545"></a>01545   UIP_TCP_BUF-&gt;ackno[1] = c;
    1578. 

  1578. <a name="l01546"></a>01546   
    1579. 

  1579. <a name="l01547"></a>01547   c = UIP_TCP_BUF-&gt;seqno[0];
    1580. 

  1580. <a name="l01548"></a>01548   UIP_TCP_BUF-&gt;seqno[0] = UIP_TCP_BUF-&gt;ackno[0];
    1581. 

  1581. <a name="l01549"></a>01549   UIP_TCP_BUF-&gt;ackno[0] = c;
    1582. 

  1582. <a name="l01550"></a>01550 
    1583. 

  1583. <a name="l01551"></a>01551   <span class="comment">/* We also have to increase the sequence number we are</span>
    1584. 

  1584. <a name="l01552"></a>01552 <span class="comment">     acknowledging. If the least significant byte overflowed, we need</span>
    1585. 

  1585. <a name="l01553"></a>01553 <span class="comment">     to propagate the carry to the other bytes as well. */</span>
    1586. 

  1586. <a name="l01554"></a>01554   <span class="keywordflow">if</span>(++UIP_TCP_BUF-&gt;ackno[3] == 0) {
    1587. 

  1587. <a name="l01555"></a>01555     <span class="keywordflow">if</span>(++UIP_TCP_BUF-&gt;ackno[2] == 0) {
    1588. 

  1588. <a name="l01556"></a>01556       <span class="keywordflow">if</span>(++UIP_TCP_BUF-&gt;ackno[1] == 0) {
    1589. 

  1589. <a name="l01557"></a>01557         ++UIP_TCP_BUF-&gt;ackno[0];
    1590. 

  1590. <a name="l01558"></a>01558       }
    1591. 

  1591. <a name="l01559"></a>01559     }
    1592. 

  1592. <a name="l01560"></a>01560   }
    1593. 

  1593. <a name="l01561"></a>01561  
    1594. 

  1594. <a name="l01562"></a>01562   <span class="comment">/* Swap port numbers. */</span>
    1595. 

  1595. <a name="l01563"></a>01563   tmp16 = UIP_TCP_BUF-&gt;srcport;
    1596. 

  1596. <a name="l01564"></a>01564   UIP_TCP_BUF-&gt;srcport = UIP_TCP_BUF-&gt;destport;
    1597. 

  1597. <a name="l01565"></a>01565   UIP_TCP_BUF-&gt;destport = tmp16;
    1598. 

  1598. <a name="l01566"></a>01566   
    1599. 

  1599. <a name="l01567"></a>01567   <span class="comment">/* Swap IP addresses. */</span>
    1600. 

  1600. <a name="l01568"></a>01568   <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&amp;UIP_IP_BUF-&gt;destipaddr, &amp;UIP_IP_BUF-&gt;srcipaddr);
    1601. 

  1601. <a name="l01569"></a>01569   <a class="code" href="a01685.html#gab4be25c579b63df6ce5b3a0d8b067b27" title="Source address selection, see RFC 3484.">uip_ds6_select_src</a>(&amp;UIP_IP_BUF-&gt;srcipaddr, &amp;UIP_IP_BUF-&gt;destipaddr);
    1602. 

  1602. <a name="l01570"></a>01570   <span class="comment">/* And send out the RST packet! */</span>
    1603. 

  1603. <a name="l01571"></a>01571   <span class="keywordflow">goto</span> tcp_send_noconn;
    1604. 

  1604. <a name="l01572"></a>01572 
    1605. 

  1605. <a name="l01573"></a>01573   <span class="comment">/* This label will be jumped to if we matched the incoming packet</span>
    1606. 

  1606. <a name="l01574"></a>01574 <span class="comment">     with a connection in LISTEN. In that case, we should create a new</span>
    1607. 

  1607. <a name="l01575"></a>01575 <span class="comment">     connection and send a SYNACK in return. */</span>
    1608. 

  1608. <a name="l01576"></a>01576  found_listen:
    1609. 

  1609. <a name="l01577"></a>01577   PRINTF(<span class="stringliteral">&quot;In found listen\n&quot;</span>);
    1610. 

  1610. <a name="l01578"></a>01578   <span class="comment">/* First we check if there are any connections avaliable. Unused</span>
    1611. 

  1611. <a name="l01579"></a>01579 <span class="comment">     connections are kept in the same table as used connections, but</span>
    1612. 

  1612. <a name="l01580"></a>01580 <span class="comment">     unused ones have the tcpstate set to CLOSED. Also, connections in</span>
    1613. 

  1613. <a name="l01581"></a>01581 <span class="comment">     TIME_WAIT are kept track of and we&apos;ll use the oldest one if no</span>
    1614. 

  1614. <a name="l01582"></a>01582 <span class="comment">     CLOSED connections are found. Thanks to Eddie C. Dost for a very</span>
    1615. 

  1615. <a name="l01583"></a>01583 <span class="comment">     nice algorithm for the TIME_WAIT search. */</span>
    1616. 

  1616. <a name="l01584"></a>01584   uip_connr = 0;
    1617. 

  1617. <a name="l01585"></a>01585   <span class="keywordflow">for</span>(c = 0; c &lt; UIP_CONNS; ++c) {
    1618. 

  1618. <a name="l01586"></a>01586     <span class="keywordflow">if</span>(uip_conns[c].<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> == UIP_CLOSED) {
    1619. 

  1619. <a name="l01587"></a>01587       uip_connr = &amp;uip_conns[c];
    1620. 

  1620. <a name="l01588"></a>01588       <span class="keywordflow">break</span>;
    1621. 

  1621. <a name="l01589"></a>01589     }
    1622. 

  1622. <a name="l01590"></a>01590     <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) {
    1623. 

  1623. <a name="l01591"></a>01591       <span class="keywordflow">if</span>(uip_connr == 0 ||
    1624. 

  1624. <a name="l01592"></a>01592          uip_conns[c].<a class="code" href="a00086.html" title="A timer.">timer</a> &gt; uip_connr-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a>) {
    1625. 

  1625. <a name="l01593"></a>01593         uip_connr = &amp;uip_conns[c];
    1626. 

  1626. <a name="l01594"></a>01594       }
    1627. 

  1627. <a name="l01595"></a>01595     }
    1628. 

  1628. <a name="l01596"></a>01596   }
    1629. 

  1629. <a name="l01597"></a>01597 
    1630. 

  1630. <a name="l01598"></a>01598   <span class="keywordflow">if</span>(uip_connr == 0) {
    1631. 

  1631. <a name="l01599"></a>01599     <span class="comment">/* All connections are used already, we drop packet and hope that</span>
    1632. 

  1632. <a name="l01600"></a>01600 <span class="comment">       the remote end will retransmit the packet at a time when we</span>
    1633. 

  1633. <a name="l01601"></a>01601 <span class="comment">       have more spare connections. */</span>
    1634. 

  1634. <a name="l01602"></a>01602     <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.syndrop);
    1635. 

  1635. <a name="l01603"></a>01603     UIP_LOG(<span class="stringliteral">&quot;tcp: found no unused connections.&quot;</span>);
    1636. 

  1636. <a name="l01604"></a>01604     <span class="keywordflow">goto</span> drop;
    1637. 

  1637. <a name="l01605"></a>01605   }
    1638. 

  1638. <a name="l01606"></a>01606   uip_conn = uip_connr;
    1639. 

  1639. <a name="l01607"></a>01607   
    1640. 

  1640. <a name="l01608"></a>01608   <span class="comment">/* Fill in the necessary fields for the new connection. */</span>
    1641. 

  1641. <a name="l01609"></a>01609   uip_connr-&gt;<a class="code" href="a00092.html#ae3aa9cc25e45b663e6aabc54c013019e" title="Retransmission time-out.">rto</a> = uip_connr-&gt;<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>;
    1642. 

  1642. <a name="l01610"></a>01610   uip_connr-&gt;<a class="code" href="a00092.html#aef661afb3aa82f0437d2ed8d3c20be76" title="Retransmission time-out calculation state variable.">sa</a> = 0;
    1643. 

  1643. <a name="l01611"></a>01611   uip_connr-&gt;<a class="code" href="a00092.html#aeb9fcbd3c9b0a795dcd63f33c323d65c" title="Retransmission time-out calculation state variable.">sv</a> = 4;
    1644. 

  1644. <a name="l01612"></a>01612   uip_connr-&gt;<a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> = 0;
    1645. 

  1645. <a name="l01613"></a>01613   uip_connr-&gt;<a class="code" href="a00092.html#a0cd09beee671e7e9efb0b4aced10249e" title="The local TCP port, in network byte order.">lport</a> = UIP_TCP_BUF-&gt;destport;
    1646. 

  1646. <a name="l01614"></a>01614   uip_connr-&gt;<a class="code" href="a00092.html#a1df6aa054ef2fa634ac4c6f418228285" title="The local remote TCP port, in network byte order.">rport</a> = UIP_TCP_BUF-&gt;srcport;
    1647. 

  1647. <a name="l01615"></a>01615   <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&amp;uip_connr-&gt;<a class="code" href="a00092.html#a79510aa86d3fa0a0fc6cfc49b1da7279" title="The IP address of the remote host.">ripaddr</a>, &amp;UIP_IP_BUF-&gt;srcipaddr);
    1648. 

  1648. <a name="l01616"></a>01616   uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_SYN_RCVD;
    1649. 

  1649. <a name="l01617"></a>01617 
    1650. 

  1650. <a name="l01618"></a>01618   uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[0] = iss[0];
    1651. 

  1651. <a name="l01619"></a>01619   uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[1] = iss[1];
    1652. 

  1652. <a name="l01620"></a>01620   uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[2] = iss[2];
    1653. 

  1653. <a name="l01621"></a>01621   uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[3] = iss[3];
    1654. 

  1654. <a name="l01622"></a>01622   uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 1;
    1655. 

  1655. <a name="l01623"></a>01623 
    1656. 

  1656. <a name="l01624"></a>01624   <span class="comment">/* rcv_nxt should be the seqno from the incoming packet + 1. */</span>
    1657. 

  1657. <a name="l01625"></a>01625   uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[3] = UIP_TCP_BUF-&gt;seqno[3];
    1658. 

  1658. <a name="l01626"></a>01626   uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[2] = UIP_TCP_BUF-&gt;seqno[2];
    1659. 

  1659. <a name="l01627"></a>01627   uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[1] = UIP_TCP_BUF-&gt;seqno[1];
    1660. 

  1660. <a name="l01628"></a>01628   uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[0] = UIP_TCP_BUF-&gt;seqno[0];
    1661. 

  1661. <a name="l01629"></a>01629   uip_add_rcv_nxt(1);
    1662. 

  1662. <a name="l01630"></a>01630 
    1663. 

  1663. <a name="l01631"></a>01631   <span class="comment">/* Parse the TCP MSS option, if present. */</span>
    1664. 

  1664. <a name="l01632"></a>01632   <span class="keywordflow">if</span>((UIP_TCP_BUF-&gt;tcpoffset &amp; 0xf0) &gt; 0x50) {
    1665. 

  1665. <a name="l01633"></a>01633     <span class="keywordflow">for</span>(c = 0; c &lt; ((UIP_TCP_BUF-&gt;tcpoffset &gt;&gt; 4) - 5) &lt;&lt; 2 ;) {
    1666. 

  1666. <a name="l01634"></a>01634       opt = uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + c];
    1667. 

  1667. <a name="l01635"></a>01635       <span class="keywordflow">if</span>(opt == TCP_OPT_END) {
    1668. 

  1668. <a name="l01636"></a>01636         <span class="comment">/* End of options. */</span>
    1669. 

  1669. <a name="l01637"></a>01637         <span class="keywordflow">break</span>;
    1670. 

  1670. <a name="l01638"></a>01638       } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == TCP_OPT_NOOP) {
    1671. 

  1671. <a name="l01639"></a>01639         ++c;
    1672. 

  1672. <a name="l01640"></a>01640         <span class="comment">/* NOP option. */</span>
    1673. 

  1673. <a name="l01641"></a>01641       } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == TCP_OPT_MSS &amp;&amp;
    1674. 

  1674. <a name="l01642"></a>01642                 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) {
    1675. 

  1675. <a name="l01643"></a>01643         <span class="comment">/* An MSS option with the right option length. */</span>
    1676. 

  1676. <a name="l01644"></a>01644         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] &lt;&lt; 8) |
    1677. 

  1677. <a name="l01645"></a>01645           (<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];
    1678. 

  1678. <a name="l01646"></a>01646         uip_connr-&gt;<a class="code" href="a00092.html#adb7a3fadb68df5fdd37e8b91a2c751ea" title="Initial maximum segment size for the connection.">initialmss</a> = uip_connr-&gt;<a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a> =
    1679. 

  1679. <a name="l01647"></a>01647           tmp16 &gt; <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;
    1680. 

  1680. <a name="l01648"></a>01648    
    1681. 

  1681. <a name="l01649"></a>01649         <span class="comment">/* And we are done processing options. */</span>
    1682. 

  1682. <a name="l01650"></a>01650         <span class="keywordflow">break</span>;
    1683. 

  1683. <a name="l01651"></a>01651       } <span class="keywordflow">else</span> {
    1684. 

  1684. <a name="l01652"></a>01652         <span class="comment">/* All other options have a length field, so that we easily</span>
    1685. 

  1685. <a name="l01653"></a>01653 <span class="comment">           can skip past them. */</span>
    1686. 

  1686. <a name="l01654"></a>01654         <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) {
    1687. 

  1687. <a name="l01655"></a>01655           <span class="comment">/* If the length field is zero, the options are malformed</span>
    1688. 

  1688. <a name="l01656"></a>01656 <span class="comment">             and we don&apos;t process them further. */</span>
    1689. 

  1689. <a name="l01657"></a>01657           <span class="keywordflow">break</span>;
    1690. 

  1690. <a name="l01658"></a>01658         }
    1691. 

  1691. <a name="l01659"></a>01659         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];
    1692. 

  1692. <a name="l01660"></a>01660       }
    1693. 

  1693. <a name="l01661"></a>01661     }
    1694. 

  1694. <a name="l01662"></a>01662   }
    1695. 

  1695. <a name="l01663"></a>01663   
    1696. 

  1696. <a name="l01664"></a>01664   <span class="comment">/* Our response will be a SYNACK. */</span>
    1697. 

  1697. <a name="l01665"></a>01665 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
    1698. 

  1698. <a name="l01666"></a>01666 <span class="preprocessor"></span> tcp_send_synack:
    1699. 

  1699. <a name="l01667"></a>01667   UIP_TCP_BUF-&gt;flags = TCP_ACK;
    1700. 

  1700. <a name="l01668"></a>01668   
    1701. 

  1701. <a name="l01669"></a>01669  tcp_send_syn:
    1702. 

  1702. <a name="l01670"></a>01670   UIP_TCP_BUF-&gt;flags |= TCP_SYN;
    1703. 

  1703. <a name="l01671"></a>01671 <span class="preprocessor">#else </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
    1704. 

  1704. <a name="l01672"></a>01672  tcp_send_synack:
    1705. 

  1705. <a name="l01673"></a>01673   UIP_TCP_BUF-&gt;flags = TCP_SYN | TCP_ACK;
    1706. 

  1706. <a name="l01674"></a>01674 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
    1707. 

  1707. <a name="l01675"></a>01675   
    1708. 

  1708. <a name="l01676"></a>01676   <span class="comment">/* We send out the TCP Maximum Segment Size option with our</span>
    1709. 

  1709. <a name="l01677"></a>01677 <span class="comment">     SYNACK. */</span>
    1710. 

  1710. <a name="l01678"></a>01678   UIP_TCP_BUF-&gt;optdata[0] = TCP_OPT_MSS;
    1711. 

  1711. <a name="l01679"></a>01679   UIP_TCP_BUF-&gt;optdata[1] = TCP_OPT_MSS_LEN;
    1712. 

  1712. <a name="l01680"></a>01680   UIP_TCP_BUF-&gt;optdata[2] = (<a class="code" href="a01585.html#ga4910467b83a639f06739c82cd362037e" title="The TCP maximum segment size.">UIP_TCP_MSS</a>) / 256;
    1713. 

  1713. <a name="l01681"></a>01681   UIP_TCP_BUF-&gt;optdata[3] = (<a class="code" href="a01585.html#ga4910467b83a639f06739c82cd362037e" title="The TCP maximum segment size.">UIP_TCP_MSS</a>) &amp; 255;
    1714. 

  1714. <a name="l01682"></a>01682   <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;
    1715. 

  1715. <a name="l01683"></a>01683   UIP_TCP_BUF-&gt;tcpoffset = ((UIP_TCPH_LEN + TCP_OPT_MSS_LEN) / 4) &lt;&lt; 4;
    1716. 

  1716. <a name="l01684"></a>01684   <span class="keywordflow">goto</span> tcp_send;
    1717. 

  1717. <a name="l01685"></a>01685 
    1718. 

  1718. <a name="l01686"></a>01686   <span class="comment">/* This label will be jumped to if we found an active connection. */</span>
    1719. 

  1719. <a name="l01687"></a>01687  found:
    1720. 

  1720. <a name="l01688"></a>01688   PRINTF(<span class="stringliteral">&quot;In found\n&quot;</span>);
    1721. 

  1721. <a name="l01689"></a>01689   uip_conn = uip_connr;
    1722. 

  1722. <a name="l01690"></a>01690   uip_flags = 0;
    1723. 

  1723. <a name="l01691"></a>01691   <span class="comment">/* We do a very naive form of TCP reset processing; we just accept</span>
    1724. 

  1724. <a name="l01692"></a>01692 <span class="comment">     any RST and kill our connection. We should in fact check if the</span>
    1725. 

  1725. <a name="l01693"></a>01693 <span class="comment">     sequence number of this reset is wihtin our advertised window</span>
    1726. 

  1726. <a name="l01694"></a>01694 <span class="comment">     before we accept the reset. */</span>
    1727. 

  1727. <a name="l01695"></a>01695   <span class="keywordflow">if</span>(UIP_TCP_BUF-&gt;flags &amp; TCP_RST) {
    1728. 

  1728. <a name="l01696"></a>01696     uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
    1729. 

  1729. <a name="l01697"></a>01697     UIP_LOG(<span class="stringliteral">&quot;tcp: got reset, aborting connection.&quot;</span>);
    1730. 

  1730. <a name="l01698"></a>01698     uip_flags = UIP_ABORT;
    1731. 

  1731. <a name="l01699"></a>01699     <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>();
    1732. 

  1732. <a name="l01700"></a>01700     <span class="keywordflow">goto</span> drop;
    1733. 

  1733. <a name="l01701"></a>01701   }
    1734. 

  1734. <a name="l01702"></a>01702   <span class="comment">/* Calculate the length of the data, if the application has sent</span>
    1735. 

  1735. <a name="l01703"></a>01703 <span class="comment">     any data to us. */</span>
    1736. 

  1736. <a name="l01704"></a>01704   c = (UIP_TCP_BUF-&gt;tcpoffset &gt;&gt; 4) &lt;&lt; 2;
    1737. 

  1737. <a name="l01705"></a>01705   <span class="comment">/* uip_len will contain the length of the actual TCP data. This is</span>
    1738. 

  1738. <a name="l01706"></a>01706 <span class="comment">     calculated by subtracing the length of the TCP header (in</span>
    1739. 

  1739. <a name="l01707"></a>01707 <span class="comment">     c) and the length of the IP header (20 bytes). */</span>
    1740. 

  1740. <a name="l01708"></a>01708   <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;
    1741. 

  1741. <a name="l01709"></a>01709 
    1742. 

  1742. <a name="l01710"></a>01710   <span class="comment">/* First, check if the sequence number of the incoming packet is</span>
    1743. 

  1743. <a name="l01711"></a>01711 <span class="comment">     what we&apos;re expecting next. If not, we send out an ACK with the</span>
    1744. 

  1744. <a name="l01712"></a>01712 <span class="comment">     correct numbers in, unless we are in the SYN_RCVD state and</span>
    1745. 

  1745. <a name="l01713"></a>01713 <span class="comment">     receive a SYN, in which case we should retransmit our SYNACK</span>
    1746. 

  1746. <a name="l01714"></a>01714 <span class="comment">     (which is done futher down). */</span>
    1747. 

  1747. <a name="l01715"></a>01715   <span class="keywordflow">if</span>(!((((uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> &amp; UIP_TS_MASK) == UIP_SYN_SENT) &amp;&amp;
    1748. 

  1748. <a name="l01716"></a>01716         ((UIP_TCP_BUF-&gt;flags &amp; TCP_CTL) == (TCP_SYN | TCP_ACK))) ||
    1749. 

  1749. <a name="l01717"></a>01717        (((uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> &amp; UIP_TS_MASK) == UIP_SYN_RCVD) &amp;&amp;
    1750. 

  1750. <a name="l01718"></a>01718         ((UIP_TCP_BUF-&gt;flags &amp; TCP_CTL) == TCP_SYN)))) {
    1751. 

  1751. <a name="l01719"></a>01719     <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> &gt; 0 || ((UIP_TCP_BUF-&gt;flags &amp; (TCP_SYN | TCP_FIN)) != 0)) &amp;&amp;
    1752. 

  1752. <a name="l01720"></a>01720        (UIP_TCP_BUF-&gt;seqno[0] != uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[0] ||
    1753. 

  1753. <a name="l01721"></a>01721         UIP_TCP_BUF-&gt;seqno[1] != uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[1] ||
    1754. 

  1754. <a name="l01722"></a>01722         UIP_TCP_BUF-&gt;seqno[2] != uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[2] ||
    1755. 

  1755. <a name="l01723"></a>01723         UIP_TCP_BUF-&gt;seqno[3] != uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[3])) {
    1756. 

  1756. <a name="l01724"></a>01724 
    1757. 

  1757. <a name="l01725"></a>01725       <span class="keywordflow">if</span>(UIP_TCP_BUF-&gt;flags &amp; TCP_SYN) {
    1758. 

  1758. <a name="l01726"></a>01726         <span class="keywordflow">goto</span> tcp_send_synack;
    1759. 

  1759. <a name="l01727"></a>01727       }
    1760. 

  1760. <a name="l01728"></a>01728       <span class="keywordflow">goto</span> tcp_send_ack;
    1761. 

  1761. <a name="l01729"></a>01729     }
    1762. 

  1762. <a name="l01730"></a>01730   }
    1763. 

  1763. <a name="l01731"></a>01731 
    1764. 

  1764. <a name="l01732"></a>01732   <span class="comment">/* Next, check if the incoming segment acknowledges any outstanding</span>
    1765. 

  1765. <a name="l01733"></a>01733 <span class="comment">     data. If so, we update the sequence number, reset the length of</span>
    1766. 

  1766. <a name="l01734"></a>01734 <span class="comment">     the outstanding data, calculate RTT estimations, and reset the</span>
    1767. 

  1767. <a name="l01735"></a>01735 <span class="comment">     retransmission timer. */</span>
    1768. 

  1768. <a name="l01736"></a>01736   <span class="keywordflow">if</span>((UIP_TCP_BUF-&gt;flags &amp; TCP_ACK) &amp;&amp; uip_outstanding(uip_connr)) {
    1769. 

  1769. <a name="l01737"></a>01737     <a class="code" href="a01684.html#ga6832e4d2d046536b6472f7ac92340f68" title="Carry out a 32-bit addition.">uip_add32</a>(uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>, uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a>);
    1770. 

  1770. <a name="l01738"></a>01738 
    1771. 

  1771. <a name="l01739"></a>01739     <span class="keywordflow">if</span>(UIP_TCP_BUF-&gt;ackno[0] == uip_acc32[0] &amp;&amp;
    1772. 

  1772. <a name="l01740"></a>01740        UIP_TCP_BUF-&gt;ackno[1] == uip_acc32[1] &amp;&amp;
    1773. 

  1773. <a name="l01741"></a>01741        UIP_TCP_BUF-&gt;ackno[2] == uip_acc32[2] &amp;&amp;
    1774. 

  1774. <a name="l01742"></a>01742        UIP_TCP_BUF-&gt;ackno[3] == uip_acc32[3]) {
    1775. 

  1775. <a name="l01743"></a>01743       <span class="comment">/* Update sequence number. */</span>
    1776. 

  1776. <a name="l01744"></a>01744       uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[0] = uip_acc32[0];
    1777. 

  1777. <a name="l01745"></a>01745       uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[1] = uip_acc32[1];
    1778. 

  1778. <a name="l01746"></a>01746       uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[2] = uip_acc32[2];
    1779. 

  1779. <a name="l01747"></a>01747       uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[3] = uip_acc32[3];
    1780. 

  1780. <a name="l01748"></a>01748    
    1781. 

  1781. <a name="l01749"></a>01749       <span class="comment">/* Do RTT estimation, unless we have done retransmissions. */</span>
    1782. 

  1782. <a name="l01750"></a>01750       <span class="keywordflow">if</span>(uip_connr-&gt;<a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> == 0) {
    1783. 

  1783. <a name="l01751"></a>01751         <span class="keywordtype">signed</span> <span class="keywordtype">char</span> m;
    1784. 

  1784. <a name="l01752"></a>01752         m = uip_connr-&gt;<a class="code" href="a00092.html#ae3aa9cc25e45b663e6aabc54c013019e" title="Retransmission time-out.">rto</a> - uip_connr-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a>;
    1785. 

  1785. <a name="l01753"></a>01753         <span class="comment">/* This is taken directly from VJs original code in his paper */</span>
    1786. 

  1786. <a name="l01754"></a>01754         m = m - (uip_connr-&gt;<a class="code" href="a00092.html#aef661afb3aa82f0437d2ed8d3c20be76" title="Retransmission time-out calculation state variable.">sa</a> &gt;&gt; 3);
    1787. 

  1787. <a name="l01755"></a>01755         uip_connr-&gt;<a class="code" href="a00092.html#aef661afb3aa82f0437d2ed8d3c20be76" title="Retransmission time-out calculation state variable.">sa</a> += m;
    1788. 

  1788. <a name="l01756"></a>01756         <span class="keywordflow">if</span>(m &lt; 0) {
    1789. 

  1789. <a name="l01757"></a>01757           m = -m;
    1790. 

  1790. <a name="l01758"></a>01758         }
    1791. 

  1791. <a name="l01759"></a>01759         m = m - (uip_connr-&gt;<a class="code" href="a00092.html#aeb9fcbd3c9b0a795dcd63f33c323d65c" title="Retransmission time-out calculation state variable.">sv</a> &gt;&gt; 2);
    1792. 

  1792. <a name="l01760"></a>01760         uip_connr-&gt;<a class="code" href="a00092.html#aeb9fcbd3c9b0a795dcd63f33c323d65c" title="Retransmission time-out calculation state variable.">sv</a> += m;
    1793. 

  1793. <a name="l01761"></a>01761         uip_connr-&gt;<a class="code" href="a00092.html#ae3aa9cc25e45b663e6aabc54c013019e" title="Retransmission time-out.">rto</a> = (uip_connr-&gt;<a class="code" href="a00092.html#aef661afb3aa82f0437d2ed8d3c20be76" title="Retransmission time-out calculation state variable.">sa</a> &gt;&gt; 3) + uip_connr-&gt;<a class="code" href="a00092.html#aeb9fcbd3c9b0a795dcd63f33c323d65c" title="Retransmission time-out calculation state variable.">sv</a>;
    1794. 

  1794. <a name="l01762"></a>01762 
    1795. 

  1795. <a name="l01763"></a>01763       }
    1796. 

  1796. <a name="l01764"></a>01764       <span class="comment">/* Set the acknowledged flag. */</span>
    1797. 

  1797. <a name="l01765"></a>01765       uip_flags = UIP_ACKDATA;
    1798. 

  1798. <a name="l01766"></a>01766       <span class="comment">/* Reset the retransmission timer. */</span>
    1799. 

  1799. <a name="l01767"></a>01767       uip_connr-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = uip_connr-&gt;<a class="code" href="a00092.html#ae3aa9cc25e45b663e6aabc54c013019e" title="Retransmission time-out.">rto</a>;
    1800. 

  1800. <a name="l01768"></a>01768 
    1801. 

  1801. <a name="l01769"></a>01769       <span class="comment">/* Reset length of outstanding data. */</span>
    1802. 

  1802. <a name="l01770"></a>01770       uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
    1803. 

  1803. <a name="l01771"></a>01771     }
    1804. 

  1804. <a name="l01772"></a>01772     
    1805. 

  1805. <a name="l01773"></a>01773   }
    1806. 

  1806. <a name="l01774"></a>01774 
    1807. 

  1807. <a name="l01775"></a>01775   <span class="comment">/* Do different things depending on in what state the connection is. */</span>
    1808. 

  1808. <a name="l01776"></a>01776   <span class="keywordflow">switch</span>(uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> &amp; UIP_TS_MASK) {
    1809. 

  1809. <a name="l01777"></a>01777     <span class="comment">/* CLOSED and LISTEN are not handled here. CLOSE_WAIT is not</span>
    1810. 

  1810. <a name="l01778"></a>01778 <span class="comment">       implemented, since we force the application to close when the</span>
    1811. 

  1811. <a name="l01779"></a>01779 <span class="comment">       peer sends a FIN (hence the application goes directly from</span>
    1812. 

  1812. <a name="l01780"></a>01780 <span class="comment">       ESTABLISHED to LAST_ACK). */</span>
    1813. 

  1813. <a name="l01781"></a>01781     <span class="keywordflow">case</span> UIP_SYN_RCVD:
    1814. 

  1814. <a name="l01782"></a>01782       <span class="comment">/* In SYN_RCVD we have sent out a SYNACK in response to a SYN, and</span>
    1815. 

  1815. <a name="l01783"></a>01783 <span class="comment">         we are waiting for an ACK that acknowledges the data we sent</span>
    1816. 

  1816. <a name="l01784"></a>01784 <span class="comment">         out the last time. Therefore, we want to have the UIP_ACKDATA</span>
    1817. 

  1817. <a name="l01785"></a>01785 <span class="comment">         flag set. If so, we enter the ESTABLISHED state. */</span>
    1818. 

  1818. <a name="l01786"></a>01786       <span class="keywordflow">if</span>(uip_flags &amp; UIP_ACKDATA) {
    1819. 

  1819. <a name="l01787"></a>01787         uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_ESTABLISHED;
    1820. 

  1820. <a name="l01788"></a>01788         uip_flags = UIP_CONNECTED;
    1821. 

  1821. <a name="l01789"></a>01789         uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
    1822. 

  1822. <a name="l01790"></a>01790         <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> &gt; 0) {
    1823. 

  1823. <a name="l01791"></a>01791           uip_flags |= UIP_NEWDATA;
    1824. 

  1824. <a name="l01792"></a>01792           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>);
    1825. 

  1825. <a name="l01793"></a>01793         }
    1826. 

  1826. <a name="l01794"></a>01794         uip_slen = 0;
    1827. 

  1827. <a name="l01795"></a>01795         <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>();
    1828. 

  1828. <a name="l01796"></a>01796         <span class="keywordflow">goto</span> appsend;
    1829. 

  1829. <a name="l01797"></a>01797       }
    1830. 

  1830. <a name="l01798"></a>01798       <span class="comment">/* We need to retransmit the SYNACK */</span>
    1831. 

  1831. <a name="l01799"></a>01799       <span class="keywordflow">if</span>((UIP_TCP_BUF-&gt;flags &amp; TCP_CTL) == TCP_SYN) {
    1832. 

  1832. <a name="l01800"></a>01800         <span class="keywordflow">goto</span> tcp_send_synack;
    1833. 

  1833. <a name="l01801"></a>01801       }
    1834. 

  1834. <a name="l01802"></a>01802       <span class="keywordflow">goto</span> drop;
    1835. 

  1835. <a name="l01803"></a>01803 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
    1836. 

  1836. <a name="l01804"></a>01804 <span class="preprocessor"></span>    <span class="keywordflow">case</span> UIP_SYN_SENT:
    1837. 

  1837. <a name="l01805"></a>01805       <span class="comment">/* In SYN_SENT, we wait for a SYNACK that is sent in response to</span>
    1838. 

  1838. <a name="l01806"></a>01806 <span class="comment">         our SYN. The rcv_nxt is set to sequence number in the SYNACK</span>
    1839. 

  1839. <a name="l01807"></a>01807 <span class="comment">         plus one, and we send an ACK. We move into the ESTABLISHED</span>
    1840. 

  1840. <a name="l01808"></a>01808 <span class="comment">         state. */</span>
    1841. 

  1841. <a name="l01809"></a>01809       <span class="keywordflow">if</span>((uip_flags &amp; UIP_ACKDATA) &amp;&amp;
    1842. 

  1842. <a name="l01810"></a>01810          (UIP_TCP_BUF-&gt;flags &amp; TCP_CTL) == (TCP_SYN | TCP_ACK)) {
    1843. 

  1843. <a name="l01811"></a>01811 
    1844. 

  1844. <a name="l01812"></a>01812         <span class="comment">/* Parse the TCP MSS option, if present. */</span>
    1845. 

  1845. <a name="l01813"></a>01813         <span class="keywordflow">if</span>((UIP_TCP_BUF-&gt;tcpoffset &amp; 0xf0) &gt; 0x50) {
    1846. 

  1846. <a name="l01814"></a>01814           <span class="keywordflow">for</span>(c = 0; c &lt; ((UIP_TCP_BUF-&gt;tcpoffset &gt;&gt; 4) - 5) &lt;&lt; 2 ;) {
    1847. 

  1847. <a name="l01815"></a>01815             opt = uip_buf[UIP_IPTCPH_LEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + c];
    1848. 

  1848. <a name="l01816"></a>01816             <span class="keywordflow">if</span>(opt == TCP_OPT_END) {
    1849. 

  1849. <a name="l01817"></a>01817               <span class="comment">/* End of options. */</span>
    1850. 

  1850. <a name="l01818"></a>01818               <span class="keywordflow">break</span>;
    1851. 

  1851. <a name="l01819"></a>01819             } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == TCP_OPT_NOOP) {
    1852. 

  1852. <a name="l01820"></a>01820               ++c;
    1853. 

  1853. <a name="l01821"></a>01821               <span class="comment">/* NOP option. */</span>
    1854. 

  1854. <a name="l01822"></a>01822             } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(opt == TCP_OPT_MSS &amp;&amp;
    1855. 

  1855. <a name="l01823"></a>01823                       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) {
    1856. 

  1856. <a name="l01824"></a>01824               <span class="comment">/* An MSS option with the right option length. */</span>
    1857. 

  1857. <a name="l01825"></a>01825               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] &lt;&lt; 8) |
    1858. 

  1858. <a name="l01826"></a>01826                 uip_buf[UIP_TCPIP_HLEN + <a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + 3 + c];
    1859. 

  1859. <a name="l01827"></a>01827               uip_connr-&gt;<a class="code" href="a00092.html#adb7a3fadb68df5fdd37e8b91a2c751ea" title="Initial maximum segment size for the connection.">initialmss</a> =
    1860. 

  1860. <a name="l01828"></a>01828                 uip_connr-&gt;<a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a> = tmp16 &gt; <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;
    1861. 

  1861. <a name="l01829"></a>01829 
    1862. 

  1862. <a name="l01830"></a>01830               <span class="comment">/* And we are done processing options. */</span>
    1863. 

  1863. <a name="l01831"></a>01831               <span class="keywordflow">break</span>;
    1864. 

  1864. <a name="l01832"></a>01832             } <span class="keywordflow">else</span> {
    1865. 

  1865. <a name="l01833"></a>01833               <span class="comment">/* All other options have a length field, so that we easily</span>
    1866. 

  1866. <a name="l01834"></a>01834 <span class="comment">                 can skip past them. */</span>
    1867. 

  1867. <a name="l01835"></a>01835               <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) {
    1868. 

  1868. <a name="l01836"></a>01836                 <span class="comment">/* If the length field is zero, the options are malformed</span>
    1869. 

  1869. <a name="l01837"></a>01837 <span class="comment">                   and we don&apos;t process them further. */</span>
    1870. 

  1870. <a name="l01838"></a>01838                 <span class="keywordflow">break</span>;
    1871. 

  1871. <a name="l01839"></a>01839               }
    1872. 

  1872. <a name="l01840"></a>01840               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];
    1873. 

  1873. <a name="l01841"></a>01841             }
    1874. 

  1874. <a name="l01842"></a>01842           }
    1875. 

  1875. <a name="l01843"></a>01843         }
    1876. 

  1876. <a name="l01844"></a>01844         uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_ESTABLISHED;
    1877. 

  1877. <a name="l01845"></a>01845         uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[0] = UIP_TCP_BUF-&gt;seqno[0];
    1878. 

  1878. <a name="l01846"></a>01846         uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[1] = UIP_TCP_BUF-&gt;seqno[1];
    1879. 

  1879. <a name="l01847"></a>01847         uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[2] = UIP_TCP_BUF-&gt;seqno[2];
    1880. 

  1880. <a name="l01848"></a>01848         uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[3] = UIP_TCP_BUF-&gt;seqno[3];
    1881. 

  1881. <a name="l01849"></a>01849         uip_add_rcv_nxt(1);
    1882. 

  1882. <a name="l01850"></a>01850         uip_flags = UIP_CONNECTED | UIP_NEWDATA;
    1883. 

  1883. <a name="l01851"></a>01851         uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
    1884. 

  1884. <a name="l01852"></a>01852         <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 0;
    1885. 

  1885. <a name="l01853"></a>01853         uip_slen = 0;
    1886. 

  1886. <a name="l01854"></a>01854         <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>();
    1887. 

  1887. <a name="l01855"></a>01855         <span class="keywordflow">goto</span> appsend;
    1888. 

  1888. <a name="l01856"></a>01856       }
    1889. 

  1889. <a name="l01857"></a>01857       <span class="comment">/* Inform the application that the connection failed */</span>
    1890. 

  1890. <a name="l01858"></a>01858       uip_flags = UIP_ABORT;
    1891. 

  1891. <a name="l01859"></a>01859       <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>();
    1892. 

  1892. <a name="l01860"></a>01860       <span class="comment">/* The connection is closed after we send the RST */</span>
    1893. 

  1893. <a name="l01861"></a>01861       uip_conn-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
    1894. 

  1894. <a name="l01862"></a>01862       <span class="keywordflow">goto</span> reset;
    1895. 

  1895. <a name="l01863"></a>01863 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
    1896. 

  1896. <a name="l01864"></a>01864     
    1897. 

  1897. <a name="l01865"></a>01865     <span class="keywordflow">case</span> UIP_ESTABLISHED:
    1898. 

  1898. <a name="l01866"></a>01866       <span class="comment">/* In the ESTABLISHED state, we call upon the application to feed</span>
    1899. 

  1899. <a name="l01867"></a>01867 <span class="comment">         data into the uip_buf. If the UIP_ACKDATA flag is set, the</span>
    1900. 

  1900. <a name="l01868"></a>01868 <span class="comment">         application should put new data into the buffer, otherwise we are</span>
    1901. 

  1901. <a name="l01869"></a>01869 <span class="comment">         retransmitting an old segment, and the application should put that</span>
    1902. 

  1902. <a name="l01870"></a>01870 <span class="comment">         data into the buffer.</span>
    1903. 

  1903. <a name="l01871"></a>01871 <span class="comment"></span>
    1904. 

  1904. <a name="l01872"></a>01872 <span class="comment">         If the incoming packet is a FIN, we should close the connection on</span>
    1905. 

  1905. <a name="l01873"></a>01873 <span class="comment">         this side as well, and we send out a FIN and enter the LAST_ACK</span>
    1906. 

  1906. <a name="l01874"></a>01874 <span class="comment">         state. We require that there is no outstanding data; otherwise the</span>
    1907. 

  1907. <a name="l01875"></a>01875 <span class="comment">         sequence numbers will be screwed up. */</span>
    1908. 

  1908. <a name="l01876"></a>01876 
    1909. 

  1909. <a name="l01877"></a>01877       <span class="keywordflow">if</span>(UIP_TCP_BUF-&gt;flags &amp; TCP_FIN &amp;&amp; !(uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> &amp; UIP_STOPPED)) {
    1910. 

  1910. <a name="l01878"></a>01878         <span class="keywordflow">if</span>(uip_outstanding(uip_connr)) {
    1911. 

  1911. <a name="l01879"></a>01879           <span class="keywordflow">goto</span> drop;
    1912. 

  1912. <a name="l01880"></a>01880         }
    1913. 

  1913. <a name="l01881"></a>01881         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>);
    1914. 

  1914. <a name="l01882"></a>01882         uip_flags |= UIP_CLOSE;
    1915. 

  1915. <a name="l01883"></a>01883         <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> &gt; 0) {
    1916. 

  1916. <a name="l01884"></a>01884           uip_flags |= UIP_NEWDATA;
    1917. 

  1917. <a name="l01885"></a>01885         }
    1918. 

  1918. <a name="l01886"></a>01886         <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>();
    1919. 

  1919. <a name="l01887"></a>01887         uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 1;
    1920. 

  1920. <a name="l01888"></a>01888         uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_LAST_ACK;
    1921. 

  1921. <a name="l01889"></a>01889         uip_connr-&gt;<a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> = 0;
    1922. 

  1922. <a name="l01890"></a>01890       tcp_send_finack:
    1923. 

  1923. <a name="l01891"></a>01891         UIP_TCP_BUF-&gt;flags = TCP_FIN | TCP_ACK;
    1924. 

  1924. <a name="l01892"></a>01892         <span class="keywordflow">goto</span> tcp_send_nodata;
    1925. 

  1925. <a name="l01893"></a>01893       }
    1926. 

  1926. <a name="l01894"></a>01894 
    1927. 

  1927. <a name="l01895"></a>01895       <span class="comment">/* Check the URG flag. If this is set, the segment carries urgent</span>
    1928. 

  1928. <a name="l01896"></a>01896 <span class="comment">         data that we must pass to the application. */</span>
    1929. 

  1929. <a name="l01897"></a>01897       <span class="keywordflow">if</span>((UIP_TCP_BUF-&gt;flags &amp; TCP_URG) != 0) {
    1930. 

  1930. <a name="l01898"></a>01898 <span class="preprocessor">#if UIP_URGDATA &gt; 0</span>
    1931. 

  1931. <a name="l01899"></a>01899 <span class="preprocessor"></span>        uip_urglen = (UIP_TCP_BUF-&gt;urgp[0] &lt;&lt; 8) | UIP_TCP_BUF-&gt;urgp[1];
    1932. 

  1932. <a name="l01900"></a>01900         <span class="keywordflow">if</span>(uip_urglen &gt; <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>) {
    1933. 

  1933. <a name="l01901"></a>01901           <span class="comment">/* There is more urgent data in the next segment to come. */</span>
    1934. 

  1934. <a name="l01902"></a>01902           uip_urglen = <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>;
    1935. 

  1935. <a name="l01903"></a>01903         }
    1936. 

  1936. <a name="l01904"></a>01904         uip_add_rcv_nxt(uip_urglen);
    1937. 

  1937. <a name="l01905"></a>01905         <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> -= uip_urglen;
    1938. 

  1938. <a name="l01906"></a>01906         uip_urgdata = <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a>;
    1939. 

  1939. <a name="l01907"></a>01907         <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> += uip_urglen;
    1940. 

  1940. <a name="l01908"></a>01908       } <span class="keywordflow">else</span> {
    1941. 

  1941. <a name="l01909"></a>01909         uip_urglen = 0;
    1942. 

  1942. <a name="l01910"></a>01910 <span class="preprocessor">#else </span><span class="comment">/* UIP_URGDATA &gt; 0 */</span>
    1943. 

  1943. <a name="l01911"></a>01911         <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>) + ((UIP_TCP_BUF-&gt;urgp[0] &lt;&lt; 8) | UIP_TCP_BUF-&gt;urgp[1]);
    1944. 

  1944. <a name="l01912"></a>01912         <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> -= (UIP_TCP_BUF-&gt;urgp[0] &lt;&lt; 8) | UIP_TCP_BUF-&gt;urgp[1];
    1945. 

  1945. <a name="l01913"></a>01913 #endif <span class="comment">/* UIP_URGDATA &gt; 0 */</span>
    1946. 

  1946. <a name="l01914"></a>01914       }
    1947. 

  1947. <a name="l01915"></a>01915 
    1948. 

  1948. <a name="l01916"></a>01916       <span class="comment">/* If uip_len &gt; 0 we have TCP data in the packet, and we flag this</span>
    1949. 

  1949. <a name="l01917"></a>01917 <span class="comment">         by setting the UIP_NEWDATA flag and update the sequence number</span>
    1950. 

  1950. <a name="l01918"></a>01918 <span class="comment">         we acknowledge. If the application has stopped the dataflow</span>
    1951. 

  1951. <a name="l01919"></a>01919 <span class="comment">         using uip_stop(), we must not accept any data packets from the</span>
    1952. 

  1952. <a name="l01920"></a>01920 <span class="comment">         remote host. */</span>
    1953. 

  1953. <a name="l01921"></a>01921       <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> &gt; 0 &amp;&amp; !(uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> &amp; UIP_STOPPED)) {
    1954. 

  1954. <a name="l01922"></a>01922         uip_flags |= UIP_NEWDATA;
    1955. 

  1955. <a name="l01923"></a>01923         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>);
    1956. 

  1956. <a name="l01924"></a>01924       }
    1957. 

  1957. <a name="l01925"></a>01925 
    1958. 

  1958. <a name="l01926"></a>01926       <span class="comment">/* Check if the available buffer space advertised by the other end</span>
    1959. 

  1959. <a name="l01927"></a>01927 <span class="comment">         is smaller than the initial MSS for this connection. If so, we</span>
    1960. 

  1960. <a name="l01928"></a>01928 <span class="comment">         set the current MSS to the window size to ensure that the</span>
    1961. 

  1961. <a name="l01929"></a>01929 <span class="comment">         application does not send more data than the other end can</span>
    1962. 

  1962. <a name="l01930"></a>01930 <span class="comment">         handle.</span>
    1963. 

  1963. <a name="l01931"></a>01931 <span class="comment"></span>
    1964. 

  1964. <a name="l01932"></a>01932 <span class="comment">         If the remote host advertises a zero window, we set the MSS to</span>
    1965. 

  1965. <a name="l01933"></a>01933 <span class="comment">         the initial MSS so that the application will send an entire MSS</span>
    1966. 

  1966. <a name="l01934"></a>01934 <span class="comment">         of data. This data will not be acknowledged by the receiver,</span>
    1967. 

  1967. <a name="l01935"></a>01935 <span class="comment">         and the application will retransmit it. This is called the</span>
    1968. 

  1968. <a name="l01936"></a>01936 <span class="comment">         &quot;persistent timer&quot; and uses the retransmission mechanim.</span>
    1969. 

  1969. <a name="l01937"></a>01937 <span class="comment">      */</span>
    1970. 

  1970. <a name="l01938"></a>01938       tmp16 = ((<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>)UIP_TCP_BUF-&gt;wnd[0] &lt;&lt; 8) + (<a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>)UIP_TCP_BUF-&gt;wnd[1];
    1971. 

  1971. <a name="l01939"></a>01939       <span class="keywordflow">if</span>(tmp16 &gt; uip_connr-&gt;<a class="code" href="a00092.html#adb7a3fadb68df5fdd37e8b91a2c751ea" title="Initial maximum segment size for the connection.">initialmss</a> ||
    1972. 

  1972. <a name="l01940"></a>01940          tmp16 == 0) {
    1973. 

  1973. <a name="l01941"></a>01941         tmp16 = uip_connr-&gt;<a class="code" href="a00092.html#adb7a3fadb68df5fdd37e8b91a2c751ea" title="Initial maximum segment size for the connection.">initialmss</a>;
    1974. 

  1974. <a name="l01942"></a>01942       }
    1975. 

  1975. <a name="l01943"></a>01943       uip_connr-&gt;<a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a> = tmp16;
    1976. 

  1976. <a name="l01944"></a>01944 
    1977. 

  1977. <a name="l01945"></a>01945       <span class="comment">/* If this packet constitutes an ACK for outstanding data (flagged</span>
    1978. 

  1978. <a name="l01946"></a>01946 <span class="comment">         by the UIP_ACKDATA flag, we should call the application since it</span>
    1979. 

  1979. <a name="l01947"></a>01947 <span class="comment">         might want to send more data. If the incoming packet had data</span>
    1980. 

  1980. <a name="l01948"></a>01948 <span class="comment">         from the peer (as flagged by the UIP_NEWDATA flag), the</span>
    1981. 

  1981. <a name="l01949"></a>01949 <span class="comment">         application must also be notified.</span>
    1982. 

  1982. <a name="l01950"></a>01950 <span class="comment"></span>
    1983. 

  1983. <a name="l01951"></a>01951 <span class="comment">         When the application is called, the global variable uip_len</span>
    1984. 

  1984. <a name="l01952"></a>01952 <span class="comment">         contains the length of the incoming data. The application can</span>
    1985. 

  1985. <a name="l01953"></a>01953 <span class="comment">         access the incoming data through the global pointer</span>
    1986. 

  1986. <a name="l01954"></a>01954 <span class="comment">         uip_appdata, which usually points UIP_IPTCPH_LEN + UIP_LLH_LEN</span>
    1987. 

  1987. <a name="l01955"></a>01955 <span class="comment">         bytes into the uip_buf array.</span>
    1988. 

  1988. <a name="l01956"></a>01956 <span class="comment"></span>
    1989. 

  1989. <a name="l01957"></a>01957 <span class="comment">         If the application wishes to send any data, this data should be</span>
    1990. 

  1990. <a name="l01958"></a>01958 <span class="comment">         put into the uip_appdata and the length of the data should be</span>
    1991. 

  1991. <a name="l01959"></a>01959 <span class="comment">         put into uip_len. If the application don&apos;t have any data to</span>
    1992. 

  1992. <a name="l01960"></a>01960 <span class="comment">         send, uip_len must be set to 0. */</span>
    1993. 

  1993. <a name="l01961"></a>01961       <span class="keywordflow">if</span>(uip_flags &amp; (UIP_NEWDATA | UIP_ACKDATA)) {
    1994. 

  1994. <a name="l01962"></a>01962         uip_slen = 0;
    1995. 

  1995. <a name="l01963"></a>01963         <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>();
    1996. 

  1996. <a name="l01964"></a>01964 
    1997. 

  1997. <a name="l01965"></a>01965       appsend:
    1998. 

  1998. <a name="l01966"></a>01966       
    1999. 

  1999. <a name="l01967"></a>01967         <span class="keywordflow">if</span>(uip_flags &amp; UIP_ABORT) {
    2000. 

  2000. <a name="l01968"></a>01968           uip_slen = 0;
    2001. 

  2001. <a name="l01969"></a>01969           uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
    2002. 

  2002. <a name="l01970"></a>01970           UIP_TCP_BUF-&gt;flags = TCP_RST | TCP_ACK;
    2003. 

  2003. <a name="l01971"></a>01971           <span class="keywordflow">goto</span> tcp_send_nodata;
    2004. 

  2004. <a name="l01972"></a>01972         }
    2005. 

  2005. <a name="l01973"></a>01973 
    2006. 

  2006. <a name="l01974"></a>01974         <span class="keywordflow">if</span>(uip_flags &amp; UIP_CLOSE) {
    2007. 

  2007. <a name="l01975"></a>01975           uip_slen = 0;
    2008. 

  2008. <a name="l01976"></a>01976           uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 1;
    2009. 

  2009. <a name="l01977"></a>01977           uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_FIN_WAIT_1;
    2010. 

  2010. <a name="l01978"></a>01978           uip_connr-&gt;<a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> = 0;
    2011. 

  2011. <a name="l01979"></a>01979           UIP_TCP_BUF-&gt;flags = TCP_FIN | TCP_ACK;
    2012. 

  2012. <a name="l01980"></a>01980           <span class="keywordflow">goto</span> tcp_send_nodata;
    2013. 

  2013. <a name="l01981"></a>01981         }
    2014. 

  2014. <a name="l01982"></a>01982 
    2015. 

  2015. <a name="l01983"></a>01983         <span class="comment">/* If uip_slen &gt; 0, the application has data to be sent. */</span>
    2016. 

  2016. <a name="l01984"></a>01984         <span class="keywordflow">if</span>(uip_slen &gt; 0) {
    2017. 

  2017. <a name="l01985"></a>01985 
    2018. 

  2018. <a name="l01986"></a>01986           <span class="comment">/* If the connection has acknowledged data, the contents of</span>
    2019. 

  2019. <a name="l01987"></a>01987 <span class="comment">             the -&gt;len variable should be discarded. */</span>
    2020. 

  2020. <a name="l01988"></a>01988           <span class="keywordflow">if</span>((uip_flags &amp; UIP_ACKDATA) != 0) {
    2021. 

  2021. <a name="l01989"></a>01989             uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
    2022. 

  2022. <a name="l01990"></a>01990           }
    2023. 

  2023. <a name="l01991"></a>01991 
    2024. 

  2024. <a name="l01992"></a>01992           <span class="comment">/* If the -&gt;len variable is non-zero the connection has</span>
    2025. 

  2025. <a name="l01993"></a>01993 <span class="comment">             already data in transit and cannot send anymore right</span>
    2026. 

  2026. <a name="l01994"></a>01994 <span class="comment">             now. */</span>
    2027. 

  2027. <a name="l01995"></a>01995           <span class="keywordflow">if</span>(uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> == 0) {
    2028. 

  2028. <a name="l01996"></a>01996 
    2029. 

  2029. <a name="l01997"></a>01997             <span class="comment">/* The application cannot send more than what is allowed by</span>
    2030. 

  2030. <a name="l01998"></a>01998 <span class="comment">               the mss (the minumum of the MSS and the available</span>
    2031. 

  2031. <a name="l01999"></a>01999 <span class="comment">               window). */</span>
    2032. 

  2032. <a name="l02000"></a>02000             <span class="keywordflow">if</span>(uip_slen &gt; uip_connr-&gt;<a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a>) {
    2033. 

  2033. <a name="l02001"></a>02001               uip_slen = uip_connr-&gt;<a class="code" href="a00092.html#a3347ef1b6e8581402445d1a0280c7a14" title="Current maximum segment size for the connection.">mss</a>;
    2034. 

  2034. <a name="l02002"></a>02002             }
    2035. 

  2035. <a name="l02003"></a>02003 
    2036. 

  2036. <a name="l02004"></a>02004             <span class="comment">/* Remember how much data we send out now so that we know</span>
    2037. 

  2037. <a name="l02005"></a>02005 <span class="comment">               when everything has been acknowledged. */</span>
    2038. 

  2038. <a name="l02006"></a>02006             uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = uip_slen;
    2039. 

  2039. <a name="l02007"></a>02007           } <span class="keywordflow">else</span> {
    2040. 

  2040. <a name="l02008"></a>02008 
    2041. 

  2041. <a name="l02009"></a>02009             <span class="comment">/* If the application already had unacknowledged data, we</span>
    2042. 

  2042. <a name="l02010"></a>02010 <span class="comment">               make sure that the application does not send (i.e.,</span>
    2043. 

  2043. <a name="l02011"></a>02011 <span class="comment">               retransmit) out more than it previously sent out. */</span>
    2044. 

  2044. <a name="l02012"></a>02012             uip_slen = uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a>;
    2045. 

  2045. <a name="l02013"></a>02013           }
    2046. 

  2046. <a name="l02014"></a>02014         }
    2047. 

  2047. <a name="l02015"></a>02015         uip_connr-&gt;<a class="code" href="a00092.html#a4289c59840b128f2f6526e9da2711d47" title="The number of retransmissions for the last segment sent.">nrtx</a> = 0;
    2048. 

  2048. <a name="l02016"></a>02016       apprexmit:
    2049. 

  2049. <a name="l02017"></a>02017         <a class="code" href="a01684.html#ga561b8eda32e059d4e7397f776268cc63" title="Pointer to the application data in the packet buffer.">uip_appdata</a> = uip_sappdata;
    2050. 

  2050. <a name="l02018"></a>02018       
    2051. 

  2051. <a name="l02019"></a>02019         <span class="comment">/* If the application has data to be sent, or if the incoming</span>
    2052. 

  2052. <a name="l02020"></a>02020 <span class="comment">           packet had new data in it, we must send out a packet. */</span>
    2053. 

  2053. <a name="l02021"></a>02021         <span class="keywordflow">if</span>(uip_slen &gt; 0 &amp;&amp; uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> &gt; 0) {
    2054. 

  2054. <a name="l02022"></a>02022           <span class="comment">/* Add the length of the IP and TCP headers. */</span>
    2055. 

  2055. <a name="l02023"></a>02023           <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> + UIP_TCPIP_HLEN;
    2056. 

  2056. <a name="l02024"></a>02024           <span class="comment">/* We always set the ACK flag in response packets. */</span>
    2057. 

  2057. <a name="l02025"></a>02025           UIP_TCP_BUF-&gt;flags = TCP_ACK | TCP_PSH;
    2058. 

  2058. <a name="l02026"></a>02026           <span class="comment">/* Send the packet. */</span>
    2059. 

  2059. <a name="l02027"></a>02027           <span class="keywordflow">goto</span> tcp_send_noopts;
    2060. 

  2060. <a name="l02028"></a>02028         }
    2061. 

  2061. <a name="l02029"></a>02029         <span class="comment">/* If there is no data to send, just send out a pure ACK if</span>
    2062. 

  2062. <a name="l02030"></a>02030 <span class="comment">           there is newdata. */</span>
    2063. 

  2063. <a name="l02031"></a>02031         <span class="keywordflow">if</span>(uip_flags &amp; UIP_NEWDATA) {
    2064. 

  2064. <a name="l02032"></a>02032           <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = UIP_TCPIP_HLEN;
    2065. 

  2065. <a name="l02033"></a>02033           UIP_TCP_BUF-&gt;flags = TCP_ACK;
    2066. 

  2066. <a name="l02034"></a>02034           <span class="keywordflow">goto</span> tcp_send_noopts;
    2067. 

  2067. <a name="l02035"></a>02035         }
    2068. 

  2068. <a name="l02036"></a>02036       }
    2069. 

  2069. <a name="l02037"></a>02037       <span class="keywordflow">goto</span> drop;
    2070. 

  2070. <a name="l02038"></a>02038     <span class="keywordflow">case</span> UIP_LAST_ACK:
    2071. 

  2071. <a name="l02039"></a>02039       <span class="comment">/* We can close this connection if the peer has acknowledged our</span>
    2072. 

  2072. <a name="l02040"></a>02040 <span class="comment">         FIN. This is indicated by the UIP_ACKDATA flag. */</span>
    2073. 

  2073. <a name="l02041"></a>02041       <span class="keywordflow">if</span>(uip_flags &amp; UIP_ACKDATA) {
    2074. 

  2074. <a name="l02042"></a>02042         uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSED;
    2075. 

  2075. <a name="l02043"></a>02043         uip_flags = UIP_CLOSE;
    2076. 

  2076. <a name="l02044"></a>02044         <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>();
    2077. 

  2077. <a name="l02045"></a>02045       }
    2078. 

  2078. <a name="l02046"></a>02046       <span class="keywordflow">break</span>;
    2079. 

  2079. <a name="l02047"></a>02047     
    2080. 

  2080. <a name="l02048"></a>02048     <span class="keywordflow">case</span> UIP_FIN_WAIT_1:
    2081. 

  2081. <a name="l02049"></a>02049       <span class="comment">/* The application has closed the connection, but the remote host</span>
    2082. 

  2082. <a name="l02050"></a>02050 <span class="comment">         hasn&apos;t closed its end yet. Thus we do nothing but wait for a</span>
    2083. 

  2083. <a name="l02051"></a>02051 <span class="comment">         FIN from the other side. */</span>
    2084. 

  2084. <a name="l02052"></a>02052       <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> &gt; 0) {
    2085. 

  2085. <a name="l02053"></a>02053         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>);
    2086. 

  2086. <a name="l02054"></a>02054       }
    2087. 

  2087. <a name="l02055"></a>02055       <span class="keywordflow">if</span>(UIP_TCP_BUF-&gt;flags &amp; TCP_FIN) {
    2088. 

  2088. <a name="l02056"></a>02056         <span class="keywordflow">if</span>(uip_flags &amp; UIP_ACKDATA) {
    2089. 

  2089. <a name="l02057"></a>02057           uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_TIME_WAIT;
    2090. 

  2090. <a name="l02058"></a>02058           uip_connr-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = 0;
    2091. 

  2091. <a name="l02059"></a>02059           uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
    2092. 

  2092. <a name="l02060"></a>02060         } <span class="keywordflow">else</span> {
    2093. 

  2093. <a name="l02061"></a>02061           uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_CLOSING;
    2094. 

  2094. <a name="l02062"></a>02062         }
    2095. 

  2095. <a name="l02063"></a>02063         uip_add_rcv_nxt(1);
    2096. 

  2096. <a name="l02064"></a>02064         uip_flags = UIP_CLOSE;
    2097. 

  2097. <a name="l02065"></a>02065         <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>();
    2098. 

  2098. <a name="l02066"></a>02066         <span class="keywordflow">goto</span> tcp_send_ack;
    2099. 

  2099. <a name="l02067"></a>02067       } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(uip_flags &amp; UIP_ACKDATA) {
    2100. 

  2100. <a name="l02068"></a>02068         uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_FIN_WAIT_2;
    2101. 

  2101. <a name="l02069"></a>02069         uip_connr-&gt;<a class="code" href="a00092.html#a0ef3ae2764714bf90620075c374c262e" title="Length of the data that was previously sent.">len</a> = 0;
    2102. 

  2102. <a name="l02070"></a>02070         <span class="keywordflow">goto</span> drop;
    2103. 

  2103. <a name="l02071"></a>02071       }
    2104. 

  2104. <a name="l02072"></a>02072       <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> &gt; 0) {
    2105. 

  2105. <a name="l02073"></a>02073         <span class="keywordflow">goto</span> tcp_send_ack;
    2106. 

  2106. <a name="l02074"></a>02074       }
    2107. 

  2107. <a name="l02075"></a>02075       <span class="keywordflow">goto</span> drop;
    2108. 

  2108. <a name="l02076"></a>02076       
    2109. 

  2109. <a name="l02077"></a>02077     <span class="keywordflow">case</span> UIP_FIN_WAIT_2:
    2110. 

  2110. <a name="l02078"></a>02078       <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> &gt; 0) {
    2111. 

  2111. <a name="l02079"></a>02079         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>);
    2112. 

  2112. <a name="l02080"></a>02080       }
    2113. 

  2113. <a name="l02081"></a>02081       <span class="keywordflow">if</span>(UIP_TCP_BUF-&gt;flags &amp; TCP_FIN) {
    2114. 

  2114. <a name="l02082"></a>02082         uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_TIME_WAIT;
    2115. 

  2115. <a name="l02083"></a>02083         uip_connr-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = 0;
    2116. 

  2116. <a name="l02084"></a>02084         uip_add_rcv_nxt(1);
    2117. 

  2117. <a name="l02085"></a>02085         uip_flags = UIP_CLOSE;
    2118. 

  2118. <a name="l02086"></a>02086         <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>();
    2119. 

  2119. <a name="l02087"></a>02087         <span class="keywordflow">goto</span> tcp_send_ack;
    2120. 

  2120. <a name="l02088"></a>02088       }
    2121. 

  2121. <a name="l02089"></a>02089       <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> &gt; 0) {
    2122. 

  2122. <a name="l02090"></a>02090         <span class="keywordflow">goto</span> tcp_send_ack;
    2123. 

  2123. <a name="l02091"></a>02091       }
    2124. 

  2124. <a name="l02092"></a>02092       <span class="keywordflow">goto</span> drop;
    2125. 

  2125. <a name="l02093"></a>02093 
    2126. 

  2126. <a name="l02094"></a>02094     <span class="keywordflow">case</span> UIP_TIME_WAIT:
    2127. 

  2127. <a name="l02095"></a>02095       <span class="keywordflow">goto</span> tcp_send_ack;
    2128. 

  2128. <a name="l02096"></a>02096     
    2129. 

  2129. <a name="l02097"></a>02097     <span class="keywordflow">case</span> UIP_CLOSING:
    2130. 

  2130. <a name="l02098"></a>02098       <span class="keywordflow">if</span>(uip_flags &amp; UIP_ACKDATA) {
    2131. 

  2131. <a name="l02099"></a>02099         uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> = UIP_TIME_WAIT;
    2132. 

  2132. <a name="l02100"></a>02100         uip_connr-&gt;<a class="code" href="a00092.html#a2d9732cf5752d30bd11cb25dc7d0c8d3" title="The retransmission timer.">timer</a> = 0;
    2133. 

  2133. <a name="l02101"></a>02101       }
    2134. 

  2134. <a name="l02102"></a>02102   }
    2135. 

  2135. <a name="l02103"></a>02103   <span class="keywordflow">goto</span> drop;
    2136. 

  2136. <a name="l02104"></a>02104   
    2137. 

  2137. <a name="l02105"></a>02105   <span class="comment">/* We jump here when we are ready to send the packet, and just want</span>
    2138. 

  2138. <a name="l02106"></a>02106 <span class="comment">     to set the appropriate TCP sequence numbers in the TCP header. */</span>
    2139. 

  2139. <a name="l02107"></a>02107  tcp_send_ack:
    2140. 

  2140. <a name="l02108"></a>02108   UIP_TCP_BUF-&gt;flags = TCP_ACK;
    2141. 

  2141. <a name="l02109"></a>02109 
    2142. 

  2142. <a name="l02110"></a>02110  tcp_send_nodata:
    2143. 

  2143. <a name="l02111"></a>02111   <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = UIP_IPTCPH_LEN;
    2144. 

  2144. <a name="l02112"></a>02112 
    2145. 

  2145. <a name="l02113"></a>02113  tcp_send_noopts:
    2146. 

  2146. <a name="l02114"></a>02114   UIP_TCP_BUF-&gt;tcpoffset = (UIP_TCPH_LEN / 4) &lt;&lt; 4;
    2147. 

  2147. <a name="l02115"></a>02115 
    2148. 

  2148. <a name="l02116"></a>02116   <span class="comment">/* We&apos;re done with the input processing. We are now ready to send a</span>
    2149. 

  2149. <a name="l02117"></a>02117 <span class="comment">     reply. Our job is to fill in all the fields of the TCP and IP</span>
    2150. 

  2150. <a name="l02118"></a>02118 <span class="comment">     headers before calculating the checksum and finally send the</span>
    2151. 

  2151. <a name="l02119"></a>02119 <span class="comment">     packet. */</span>
    2152. 

  2152. <a name="l02120"></a>02120  tcp_send:
    2153. 

  2153. <a name="l02121"></a>02121   PRINTF(<span class="stringliteral">&quot;In tcp_send\n&quot;</span>);
    2154. 

  2154. <a name="l02122"></a>02122    
    2155. 

  2155. <a name="l02123"></a>02123   UIP_TCP_BUF-&gt;ackno[0] = uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[0];
    2156. 

  2156. <a name="l02124"></a>02124   UIP_TCP_BUF-&gt;ackno[1] = uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[1];
    2157. 

  2157. <a name="l02125"></a>02125   UIP_TCP_BUF-&gt;ackno[2] = uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[2];
    2158. 

  2158. <a name="l02126"></a>02126   UIP_TCP_BUF-&gt;ackno[3] = uip_connr-&gt;<a class="code" href="a00092.html#a70297b3e6d4eaae7bd828cb50bd1efe3" title="The sequence number that we expect to receive next.">rcv_nxt</a>[3];
    2159. 

  2159. <a name="l02127"></a>02127   
    2160. 

  2160. <a name="l02128"></a>02128   UIP_TCP_BUF-&gt;seqno[0] = uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[0];
    2161. 

  2161. <a name="l02129"></a>02129   UIP_TCP_BUF-&gt;seqno[1] = uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[1];
    2162. 

  2162. <a name="l02130"></a>02130   UIP_TCP_BUF-&gt;seqno[2] = uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[2];
    2163. 

  2163. <a name="l02131"></a>02131   UIP_TCP_BUF-&gt;seqno[3] = uip_connr-&gt;<a class="code" href="a00092.html#a8f6b08a5ba2a8d75ca7279e2056aa8c6" title="The sequence number that was last sent by us.">snd_nxt</a>[3];
    2164. 

  2164. <a name="l02132"></a>02132 
    2165. 

  2165. <a name="l02133"></a>02133   UIP_IP_BUF-&gt;proto = UIP_PROTO_TCP;
    2166. 

  2166. <a name="l02134"></a>02134   
    2167. 

  2167. <a name="l02135"></a>02135   UIP_TCP_BUF-&gt;srcport  = uip_connr-&gt;<a class="code" href="a00092.html#a0cd09beee671e7e9efb0b4aced10249e" title="The local TCP port, in network byte order.">lport</a>;
    2168. 

  2168. <a name="l02136"></a>02136   UIP_TCP_BUF-&gt;destport = uip_connr-&gt;<a class="code" href="a00092.html#a1df6aa054ef2fa634ac4c6f418228285" title="The local remote TCP port, in network byte order.">rport</a>;
    2169. 

  2169. <a name="l02137"></a>02137 
    2170. 

  2170. <a name="l02138"></a>02138 
    2171. 

  2171. <a name="l02139"></a>02139   <a class="code" href="a01576.html#ga769512993b7b27271909d6daa4748b60" title="Copy an IP address to another IP address.">uip_ipaddr_copy</a>(&amp;UIP_IP_BUF-&gt;destipaddr, &amp;uip_connr-&gt;<a class="code" href="a00092.html#a79510aa86d3fa0a0fc6cfc49b1da7279" title="The IP address of the remote host.">ripaddr</a>);
    2172. 

  2172. <a name="l02140"></a>02140   <a class="code" href="a01685.html#gab4be25c579b63df6ce5b3a0d8b067b27" title="Source address selection, see RFC 3484.">uip_ds6_select_src</a>(&amp;UIP_IP_BUF-&gt;srcipaddr,&amp;UIP_IP_BUF-&gt;destipaddr);
    2173. 

  2173. <a name="l02141"></a>02141   PRINTF(<span class="stringliteral">&quot;Sending TCP packet to&quot;</span>);
    2174. 

  2174. <a name="l02142"></a>02142   PRINT6ADDR(&amp;UIP_IP_BUF-&gt;destipaddr);
    2175. 

  2175. <a name="l02143"></a>02143   PRINTF(<span class="stringliteral">&quot;from&quot;</span>);
    2176. 

  2176. <a name="l02144"></a>02144   PRINT6ADDR(&amp;UIP_IP_BUF-&gt;srcipaddr);
    2177. 

  2177. <a name="l02145"></a>02145   PRINTF(<span class="stringliteral">&quot;\n&quot;</span>);
    2178. 

  2178. <a name="l02146"></a>02146       
    2179. 

  2179. <a name="l02147"></a>02147   <span class="keywordflow">if</span>(uip_connr-&gt;<a class="code" href="a00092.html#aa5f58074435cdc180f17de69651beebd" title="TCP state and flags.">tcpstateflags</a> &amp; UIP_STOPPED) {
    2180. 

  2180. <a name="l02148"></a>02148     <span class="comment">/* If the connection has issued uip_stop(), we advertise a zero</span>
    2181. 

  2181. <a name="l02149"></a>02149 <span class="comment">       window so that the remote host will stop sending data. */</span>
    2182. 

  2182. <a name="l02150"></a>02150     UIP_TCP_BUF-&gt;wnd[0] = UIP_TCP_BUF-&gt;wnd[1] = 0;
    2183. 

  2183. <a name="l02151"></a>02151   } <span class="keywordflow">else</span> {
    2184. 

  2184. <a name="l02152"></a>02152     UIP_TCP_BUF-&gt;wnd[0] = ((<a class="code" href="a01585.html#ga5b9dba2123705bce1ce95c3deca0bdad" title="The size of the advertised receiver&amp;#39;s window.">UIP_RECEIVE_WINDOW</a>) &gt;&gt; 8);
    2185. 

  2185. <a name="l02153"></a>02153     UIP_TCP_BUF-&gt;wnd[1] = ((<a class="code" href="a01585.html#ga5b9dba2123705bce1ce95c3deca0bdad" title="The size of the advertised receiver&amp;#39;s window.">UIP_RECEIVE_WINDOW</a>) &amp; 0xff);
    2186. 

  2186. <a name="l02154"></a>02154   }
    2187. 

  2187. <a name="l02155"></a>02155 
    2188. 

  2188. <a name="l02156"></a>02156  tcp_send_noconn:
    2189. 

  2189. <a name="l02157"></a>02157   UIP_IP_BUF-&gt;ttl = <a class="code" href="a01685.html#gaecc8ec9970a01951fd9eec36e07884ef">uip_ds6_if</a>.cur_hop_limit;
    2190. 

  2190. <a name="l02158"></a>02158   UIP_IP_BUF-&gt;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) &gt;&gt; 8);
    2191. 

  2191. <a name="l02159"></a>02159   UIP_IP_BUF-&gt;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) &amp; 0xff);
    2192. 

  2192. <a name="l02160"></a>02160 
    2193. 

  2193. <a name="l02161"></a>02161   UIP_TCP_BUF-&gt;urgp[0] = UIP_TCP_BUF-&gt;urgp[1] = 0;
    2194. 

  2194. <a name="l02162"></a>02162   
    2195. 

  2195. <a name="l02163"></a>02163   <span class="comment">/* Calculate TCP checksum. */</span>
    2196. 

  2196. <a name="l02164"></a>02164   UIP_TCP_BUF-&gt;tcpchksum = 0;
    2197. 

  2197. <a name="l02165"></a>02165   UIP_TCP_BUF-&gt;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>());
    2198. 

  2198. <a name="l02166"></a>02166   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.tcp.sent);
    2199. 

  2199. <a name="l02167"></a>02167 
    2200. 

  2200. <a name="l02168"></a>02168 <span class="preprocessor">#endif </span><span class="comment">/* UIP_TCP */</span>
    2201. 

  2201. <a name="l02169"></a>02169 <span class="preprocessor">#if UIP_UDP</span>
    2202. 

  2202. <a name="l02170"></a>02170 <span class="preprocessor"></span> ip_send_nolen:
    2203. 

  2203. <a name="l02171"></a>02171 <span class="preprocessor">#endif</span>
    2204. 

  2204. <a name="l02172"></a>02172 <span class="preprocessor"></span>  UIP_IP_BUF-&gt;vtc = 0x60;
    2205. 

  2205. <a name="l02173"></a>02173   UIP_IP_BUF-&gt;tcflow = 0x00;
    2206. 

  2206. <a name="l02174"></a>02174   UIP_IP_BUF-&gt;flow = 0x00;
    2207. 

  2207. <a name="l02175"></a>02175  send:
    2208. 

  2208. <a name="l02176"></a>02176   PRINTF(<span class="stringliteral">&quot;Sending packet with length %d (%d)\n&quot;</span>, <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a>,
    2209. 

  2209. <a name="l02177"></a>02177          (UIP_IP_BUF-&gt;len[0] &lt;&lt; 8) | UIP_IP_BUF-&gt;len[1]);
    2210. 

  2210. <a name="l02178"></a>02178   
    2211. 

  2211. <a name="l02179"></a>02179   <a class="code" href="a01684.html#ga9c0814ed491fa452ec97910c0728d410" title="The uIP TCP/IP statistics.">UIP_STAT</a>(++uip_stat.ip.sent);
    2212. 

  2212. <a name="l02180"></a>02180   <span class="comment">/* Return and let the caller do the actual transmission. */</span>
    2213. 

  2213. <a name="l02181"></a>02181   uip_flags = 0;
    2214. 

  2214. <a name="l02182"></a>02182   <span class="keywordflow">return</span>;
    2215. 

  2215. <a name="l02183"></a>02183 
    2216. 

  2216. <a name="l02184"></a>02184  drop:
    2217. 

  2217. <a name="l02185"></a>02185   <a class="code" href="a01684.html#ga12a33f0c09711167bdf3dd7d7cf8c5a1" title="The length of the packet in the uip_buf buffer.">uip_len</a> = 0;
    2218. 

  2218. <a name="l02186"></a>02186   <a class="code" href="a01577.html#ga1c9ed2d0cf3e1b814dc19b76487bed50" title="The length of the extension headers.">uip_ext_len</a> = 0;
    2219. 

  2219. <a name="l02187"></a>02187   <a class="code" href="a01685.html#ga7d944013e7b02d0a5bcba53bf624aaef" title="bitmap we use to record which IPv6 headers we have already seen">uip_ext_bitmap</a> = 0;
    2220. 

  2220. <a name="l02188"></a>02188   uip_flags = 0;
    2221. 

  2221. <a name="l02189"></a>02189   <span class="keywordflow">return</span>;
    2222. 

  2222. <a name="l02190"></a>02190 }
    2223. 

  2223. <a name="l02191"></a>02191 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    2224. 

  2224. <a name="l02192"></a>02192 <a class="code" href="a01668.html#ga77570ac4fcab86864fa1916e55676da2" title="The 16-bit unsigned data type.">u16_t</a>
    2225. 

  2225. <a name="l02193"></a><a class="code" href="a01685.html#gae4394b6b3cd81f73b0e64a93e0558e00">02193</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)
    2226. 

  2226. <a name="l02194"></a>02194 {
    2227. 

  2227. <a name="l02195"></a>02195   <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);
    2228. 

  2228. <a name="l02196"></a>02196 }
    2229. 

  2229. <a name="l02197"></a>02197 
    2230. 

  2230. <a name="l02198"></a>02198 <a class="code" href="a01668.html#ga4c14294869aceba3ef9d4c0c302d0f33" title="The 32-bit unsigned data type.">u32_t</a>
    2231. 

  2231. <a name="l02199"></a>02199 uip_htonl(<a class="code" href="a01668.html#ga4c14294869aceba3ef9d4c0c302d0f33" title="The 32-bit unsigned data type.">u32_t</a> val)
    2232. 

  2232. <a name="l02200"></a>02200 {
    2233. 

  2233. <a name="l02201"></a>02201   <span class="keywordflow">return</span> UIP_HTONL(val);
    2234. 

  2234. <a name="l02202"></a>02202 }
    2235. 

  2235. <a name="l02203"></a>02203 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    2236. 

  2236. <a name="l02204"></a>02204 <span class="keywordtype">void</span>
    2237. 

  2237. <a name="l02205"></a><a class="code" href="a01685.html#ga04b053a623aac7cd4195157d470661b3">02205</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)
    2238. 

  2238. <a name="l02206"></a>02206 {
    2239. 

  2239. <a name="l02207"></a>02207   <span class="keywordtype">int</span> copylen;
    2240. 

  2240. <a name="l02208"></a>02208 <span class="preprocessor">#define MIN(a,b) ((a) &lt; (b)? (a): (b))</span>
    2241. 

  2241. <a name="l02209"></a>02209 <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 -
    2242. 

  2242. <a name="l02210"></a>02210                 (<span class="keywordtype">int</span>)((<span class="keywordtype">char</span> *)uip_sappdata - (<span class="keywordtype">char</span> *)&amp;uip_buf[<a class="code" href="a01589.html#gae6f4a2453dbd8bc60e6a82774552366a" title="The link level header length.">UIP_LLH_LEN</a> + UIP_TCPIP_HLEN]));
    2243. 

  2243. <a name="l02211"></a>02211   <span class="keywordflow">if</span>(copylen &gt; 0) {
    2244. 

  2244. <a name="l02212"></a>02212     uip_slen = copylen;
    2245. 

  2245. <a name="l02213"></a>02213     <span class="keywordflow">if</span>(data != uip_sappdata) {
    2246. 

  2246. <a name="l02214"></a>02214       memcpy(uip_sappdata, (data), uip_slen);
    2247. 

  2247. <a name="l02215"></a>02215     }
    2248. 

  2248. <a name="l02216"></a>02216   }
    2249. 

  2249. <a name="l02217"></a>02217 }
    2250. 

  2250. <a name="l02218"></a>02218 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    2251. 

  2251. <a name="l02219"></a>02219 <span class="comment"></span>
    2252. 

  2252. <a name="l02220"></a>02220 <span class="comment">/** @} */</span>
    2253. 

  2253. </pre></div></div>
    2254. 

  2254. <hr size="1"/><address style="text-align: right;"><small>Generated on Mon Apr 11 14:23:33 2011 for Contiki 2.5 by&nbsp;
    2255. 

  2255. <a href="http://www.doxygen.org/index.html">
    2256. 

  2256. <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.1 </small></address>
    2257. 

  2257. </body>
    2258. 

  2258. </html>
    2259. 

  2259.