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    21. 

  21. <h1>uip/uip.c</h1><a href="a00135.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a><a class="code" href="a00135.html#534d9e416324fb8ecca6b9cb4b1f6a6a">00001</a> <span class="preprocessor">#define DEBUG_PRINTF(...) </span><span class="comment">/*printf(__VA_ARGS__)*/</span>
    22. 

  22. <a name="l00002"></a>00002 <span class="comment"></span>
    23. 

  23. <a name="l00003"></a>00003 <span class="comment">/**</span>
    24. 

  24. <a name="l00004"></a>00004 <span class="comment"> * \defgroup uip The uIP TCP/IP stack</span>
    25. 

  25. <a name="l00005"></a>00005 <span class="comment"> * @{</span>
    26. 

  26. <a name="l00006"></a>00006 <span class="comment"> *</span>
    27. 

  27. <a name="l00007"></a>00007 <span class="comment"> * uIP is an implementation of the TCP/IP protocol stack intended for</span>
    28. 

  28. <a name="l00008"></a>00008 <span class="comment"> * small 8-bit and 16-bit microcontrollers.</span>
    29. 

  29. <a name="l00009"></a>00009 <span class="comment"> *</span>
    30. 

  30. <a name="l00010"></a>00010 <span class="comment"> * uIP provides the necessary protocols for Internet communication,</span>
    31. 

  31. <a name="l00011"></a>00011 <span class="comment"> * with a very small code footprint and RAM requirements - the uIP</span>
    32. 

  32. <a name="l00012"></a>00012 <span class="comment"> * code size is on the order of a few kilobytes and RAM usage is on</span>
    33. 

  33. <a name="l00013"></a>00013 <span class="comment"> * the order of a few hundred bytes.</span>
    34. 

  34. <a name="l00014"></a>00014 <span class="comment"> */</span>
    35. 

  35. <a name="l00015"></a>00015 <span class="comment"></span>
    36. 

  36. <a name="l00016"></a>00016 <span class="comment">/**</span>
    37. 

  37. <a name="l00017"></a>00017 <span class="comment"> * \file</span>
    38. 

  38. <a name="l00018"></a>00018 <span class="comment"> * The uIP TCP/IP stack code.</span>
    39. 

  39. <a name="l00019"></a>00019 <span class="comment"> * \author Adam Dunkels &lt;adam@dunkels.com&gt;</span>
    40. 

  40. <a name="l00020"></a>00020 <span class="comment"> */</span>
    41. 

  41. <a name="l00021"></a>00021 
    42. 

  42. <a name="l00022"></a>00022 <span class="comment">/*</span>
    43. 

  43. <a name="l00023"></a>00023 <span class="comment"> * Copyright (c) 2001-2003, Adam Dunkels.</span>
    44. 

  44. <a name="l00024"></a>00024 <span class="comment"> * All rights reserved.</span>
    45. 

  45. <a name="l00025"></a>00025 <span class="comment"> *</span>
    46. 

  46. <a name="l00026"></a>00026 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
    47. 

  47. <a name="l00027"></a>00027 <span class="comment"> * modification, are permitted provided that the following conditions</span>
    48. 

  48. <a name="l00028"></a>00028 <span class="comment"> * are met:</span>
    49. 

  49. <a name="l00029"></a>00029 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
    50. 

  50. <a name="l00030"></a>00030 <span class="comment"> *    notice, this list of conditions and the following disclaimer.</span>
    51. 

  51. <a name="l00031"></a>00031 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
    52. 

  52. <a name="l00032"></a>00032 <span class="comment"> *    notice, this list of conditions and the following disclaimer in the</span>
    53. 

  53. <a name="l00033"></a>00033 <span class="comment"> *    documentation and/or other materials provided with the distribution.</span>
    54. 

  54. <a name="l00034"></a>00034 <span class="comment"> * 3. The name of the author may not be used to endorse or promote</span>
    55. 

  55. <a name="l00035"></a>00035 <span class="comment"> *    products derived from this software without specific prior</span>
    56. 

  56. <a name="l00036"></a>00036 <span class="comment"> *    written permission.</span>
    57. 

  57. <a name="l00037"></a>00037 <span class="comment"> *</span>
    58. 

  58. <a name="l00038"></a>00038 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS</span>
    59. 

  59. <a name="l00039"></a>00039 <span class="comment"> * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED</span>
    60. 

  60. <a name="l00040"></a>00040 <span class="comment"> * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
    61. 

  61. <a name="l00041"></a>00041 <span class="comment"> * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY</span>
    62. 

  62. <a name="l00042"></a>00042 <span class="comment"> * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
    63. 

  63. <a name="l00043"></a>00043 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE</span>
    64. 

  64. <a name="l00044"></a>00044 <span class="comment"> * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
    65. 

  65. <a name="l00045"></a>00045 <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,</span>
    66. 

  66. <a name="l00046"></a>00046 <span class="comment"> * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING</span>
    67. 

  67. <a name="l00047"></a>00047 <span class="comment"> * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS</span>
    68. 

  68. <a name="l00048"></a>00048 <span class="comment"> * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span>
    69. 

  69. <a name="l00049"></a>00049 <span class="comment"> *</span>
    70. 

  70. <a name="l00050"></a>00050 <span class="comment"> * This file is part of the uIP TCP/IP stack.</span>
    71. 

  71. <a name="l00051"></a>00051 <span class="comment"> *</span>
    72. 

  72. <a name="l00052"></a>00052 <span class="comment"> * $Id: uip.c,v 1.65 2006/06/11 21:46:39 adam Exp $</span>
    73. 

  73. <a name="l00053"></a>00053 <span class="comment"> *</span>
    74. 

  74. <a name="l00054"></a>00054 <span class="comment"> */</span>
    75. 

  75. <a name="l00055"></a>00055 
    76. 

  76. <a name="l00056"></a>00056 <span class="comment">/*</span>
    77. 

  77. <a name="l00057"></a>00057 <span class="comment"> * uIP is a small implementation of the IP, UDP and TCP protocols (as</span>
    78. 

  78. <a name="l00058"></a>00058 <span class="comment"> * well as some basic ICMP stuff). The implementation couples the IP,</span>
    79. 

  79. <a name="l00059"></a>00059 <span class="comment"> * UDP, TCP and the application layers very tightly. To keep the size</span>
    80. 

  80. <a name="l00060"></a>00060 <span class="comment"> * of the compiled code down, this code frequently uses the goto</span>
    81. 

  81. <a name="l00061"></a>00061 <span class="comment"> * statement. While it would be possible to break the uip_process()</span>
    82. 

  82. <a name="l00062"></a>00062 <span class="comment"> * function into many smaller functions, this would increase the code</span>
    83. 

  83. <a name="l00063"></a>00063 <span class="comment"> * size because of the overhead of parameter passing and the fact that</span>
    84. 

  84. <a name="l00064"></a>00064 <span class="comment"> * the optimier would not be as efficient.</span>
    85. 

  85. <a name="l00065"></a>00065 <span class="comment"> *</span>
    86. 

  86. <a name="l00066"></a>00066 <span class="comment"> * The principle is that we have a small buffer, called the uip_buf,</span>
    87. 

  87. <a name="l00067"></a>00067 <span class="comment"> * in which the device driver puts an incoming packet. The TCP/IP</span>
    88. 

  88. <a name="l00068"></a>00068 <span class="comment"> * stack parses the headers in the packet, and calls the</span>
    89. 

  89. <a name="l00069"></a>00069 <span class="comment"> * application. If the remote host has sent data to the application,</span>
    90. 

  90. <a name="l00070"></a>00070 <span class="comment"> * this data is present in the uip_buf and the application read the</span>
    91. 

  91. <a name="l00071"></a>00071 <span class="comment"> * data from there. It is up to the application to put this data into</span>
    92. 

  92. <a name="l00072"></a>00072 <span class="comment"> * a byte stream if needed. The application will not be fed with data</span>
    93. 

  93. <a name="l00073"></a>00073 <span class="comment"> * that is out of sequence.</span>
    94. 

  94. <a name="l00074"></a>00074 <span class="comment"> *</span>
    95. 

  95. <a name="l00075"></a>00075 <span class="comment"> * If the application whishes to send data to the peer, it should put</span>
    96. 

  96. <a name="l00076"></a>00076 <span class="comment"> * its data into the uip_buf. The uip_appdata pointer points to the</span>
    97. 

  97. <a name="l00077"></a>00077 <span class="comment"> * first available byte. The TCP/IP stack will calculate the</span>
    98. 

  98. <a name="l00078"></a>00078 <span class="comment"> * checksums, and fill in the necessary header fields and finally send</span>
    99. 

  99. <a name="l00079"></a>00079 <span class="comment"> * the packet back to the peer.</span>
    100. 

  100. <a name="l00080"></a>00080 <span class="comment">*/</span>
    101. 

  101. <a name="l00081"></a>00081 
    102. 

  102. <a name="l00082"></a>00082 <span class="preprocessor">#include "<a class="code" href="a00136.html">uip.h</a>"</span>
    103. 

  103. <a name="l00083"></a>00083 <span class="preprocessor">#include "<a class="code" href="a00140.html">uipopt.h</a>"</span>
    104. 

  104. <a name="l00084"></a>00084 <span class="preprocessor">#include "<a class="code" href="a00137.html">uip_arch.h</a>"</span>
    105. 

  105. <a name="l00085"></a>00085 
    106. 

  106. <a name="l00086"></a>00086 <span class="preprocessor">#if UIP_CONF_IPV6</span>
    107. 

  107. <a name="l00087"></a>00087 <span class="preprocessor"></span><span class="preprocessor">#include "<a class="code" href="a00132.html">uip-neighbor.h</a>"</span>
    108. 

  108. <a name="l00088"></a>00088 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
    109. 

  109. <a name="l00089"></a>00089 
    110. 

  110. <a name="l00090"></a>00090 <span class="preprocessor">#include &lt;string.h&gt;</span>
    111. 

  111. <a name="l00091"></a>00091 
    112. 

  112. <a name="l00092"></a>00092 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    113. 

  113. <a name="l00093"></a>00093 <span class="comment">/* Variable definitions. */</span>
    114. 

  114. <a name="l00094"></a>00094 
    115. 

  115. <a name="l00095"></a>00095 
    116. 

  116. <a name="l00096"></a>00096 <span class="comment">/* The IP address of this host. If it is defined to be fixed (by</span>
    117. 

  117. <a name="l00097"></a>00097 <span class="comment">   setting UIP_FIXEDADDR to 1 in uipopt.h), the address is set</span>
    118. 

  118. <a name="l00098"></a>00098 <span class="comment">   here. Otherwise, the address */</span>
    119. 

  119. <a name="l00099"></a>00099 <span class="preprocessor">#if UIP_FIXEDADDR &gt; 0</span>
    120. 

  120. <a name="l00100"></a>00100 <span class="preprocessor"></span><span class="keyword">const</span> <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a> =
    121. 

  121. <a name="l00101"></a>00101   {<a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_IPADDR0 &lt;&lt; 8) | UIP_IPADDR1),
    122. 

  122. <a name="l00102"></a>00102    <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_IPADDR2 &lt;&lt; 8) | UIP_IPADDR3)};
    123. 

  123. <a name="l00103"></a>00103 <span class="keyword">const</span> <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> <a class="code" href="a00150.html#g20df5c82f2a15a508c19e505b5d9de2b">uip_draddr</a> =
    124. 

  124. <a name="l00104"></a>00104   {<a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_DRIPADDR0 &lt;&lt; 8) | UIP_DRIPADDR1),
    125. 

  125. <a name="l00105"></a>00105    <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_DRIPADDR2 &lt;&lt; 8) | UIP_DRIPADDR3)};
    126. 

  126. <a name="l00106"></a>00106 <span class="keyword">const</span> <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> <a class="code" href="a00150.html#g3237be0d9ec457de0177689ee23c0d5c">uip_netmask</a> =
    127. 

  127. <a name="l00107"></a>00107   {<a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_NETMASK0 &lt;&lt; 8) | UIP_NETMASK1),
    128. 

  128. <a name="l00108"></a>00108    <a class="code" href="a00148.html#g69a7a4951ff21b302267532c21ee78fc">HTONS</a>((UIP_NETMASK2 &lt;&lt; 8) | UIP_NETMASK3)};
    129. 

  129. <a name="l00109"></a>00109 <span class="preprocessor">#else</span>
    130. 

  130. <a name="l00110"></a><a class="code" href="a00150.html#g3237be0d9ec457de0177689ee23c0d5c">00110</a> <span class="preprocessor"></span><a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> <a class="code" href="a00150.html#g7d3673f52f5846b6961d23b150decd54">uip_hostaddr</a>, <a class="code" href="a00150.html#g20df5c82f2a15a508c19e505b5d9de2b">uip_draddr</a>, uip_netmask;
    131. 

  131. <a name="l00111"></a>00111 <span class="preprocessor">#endif </span><span class="comment">/* UIP_FIXEDADDR */</span>
    132. 

  132. <a name="l00112"></a>00112 
    133. 

  133. <a name="l00113"></a>00113 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> all_ones_addr =
    134. 

  134. <a name="l00114"></a>00114 <span class="preprocessor">#if UIP_CONF_IPV6</span>
    135. 

  135. <a name="l00115"></a>00115 <span class="preprocessor"></span>  {0xffff,0xffff,0xffff,0xffff,0xffff,0xffff,0xffff,0xffff};
    136. 

  136. <a name="l00116"></a>00116 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
    137. 

  137. <a name="l00117"></a>00117   {0xffff,0xffff};
    138. 

  138. <a name="l00118"></a>00118 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
    139. 

  139. <a name="l00119"></a>00119 <span class="keyword">static</span> <span class="keyword">const</span> <a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> all_zeroes_addr =
    140. 

  140. <a name="l00120"></a>00120 <span class="preprocessor">#if UIP_CONF_IPV6</span>
    141. 

  141. <a name="l00121"></a>00121 <span class="preprocessor"></span>  {0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000};
    142. 

  142. <a name="l00122"></a>00122 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
    143. 

  143. <a name="l00123"></a>00123   {0x0000,0x0000};
    144. 

  144. <a name="l00124"></a>00124 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
    145. 

  145. <a name="l00125"></a>00125 
    146. 

  146. <a name="l00126"></a>00126 
    147. 

  147. <a name="l00127"></a>00127 <span class="preprocessor">#if UIP_FIXEDETHADDR</span>
    148. 

  148. <a name="l00128"></a>00128 <span class="preprocessor"></span><span class="keyword">const</span> <span class="keyword">struct </span><a class="code" href="a00089.html">uip_eth_addr</a> <a class="code" href="a00150.html#g499bb98a0b4ae9a98553ede81317606d">uip_ethaddr</a> = {{UIP_ETHADDR0,
    149. 

  149. <a name="l00129"></a>00129                                           UIP_ETHADDR1,
    150. 

  150. <a name="l00130"></a>00130                                           UIP_ETHADDR2,
    151. 

  151. <a name="l00131"></a>00131                                           UIP_ETHADDR3,
    152. 

  152. <a name="l00132"></a>00132                                           UIP_ETHADDR4,
    153. 

  153. <a name="l00133"></a>00133                                           UIP_ETHADDR5}};
    154. 

  154. <a name="l00134"></a>00134 <span class="preprocessor">#else</span>
    155. 

  155. <a name="l00135"></a><a class="code" href="a00152.html#g499bb98a0b4ae9a98553ede81317606d">00135</a> <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00089.html">uip_eth_addr</a> <a class="code" href="a00150.html#g499bb98a0b4ae9a98553ede81317606d">uip_ethaddr</a> = {{0,0,0,0,0,0}};
    156. 

  156. <a name="l00136"></a>00136 <span class="preprocessor">#endif</span>
    157. 

  157. <a name="l00137"></a>00137 <span class="preprocessor"></span>
    158. 

  158. <a name="l00138"></a>00138 <span class="preprocessor">#ifndef UIP_CONF_EXTERNAL_BUFFER</span>
    159. 

  159. <a name="l00139"></a><a class="code" href="a00150.html#gb81e78f890dbbee50c533a9734b74fd9">00139</a> <span class="preprocessor"></span><a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> <a class="code" href="a00146.html#gb81e78f890dbbee50c533a9734b74fd9">uip_buf</a>[<a class="code" href="a00153.html#g3589822ecb9d9c4145209756396b8a6b">UIP_BUFSIZE</a> + 2];   <span class="comment">/* The packet buffer that contains</span>
    160. 

  160. <a name="l00140"></a>00140 <span class="comment">                                    incoming packets. */</span>
    161. 

  161. <a name="l00141"></a>00141 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_EXTERNAL_BUFFER */</span>
    162. 

  162. <a name="l00142"></a>00142 
    163. 

  163. <a name="l00143"></a><a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">00143</a> <span class="keywordtype">void</span> *<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a>;               <span class="comment">/* The uip_appdata pointer points to</span>
    164. 

  164. <a name="l00144"></a>00144 <span class="comment">                                    application data. */</span>
    165. 

  165. <a name="l00145"></a><a class="code" href="a00150.html#ga05a3dde2048480fa3ab2a5961898d18">00145</a> <span class="keywordtype">void</span> *<a class="code" href="a00150.html#ga05a3dde2048480fa3ab2a5961898d18">uip_sappdata</a>;              <span class="comment">/* The uip_appdata pointer points to</span>
    166. 

  166. <a name="l00146"></a>00146 <span class="comment">                                    the application data which is to</span>
    167. 

  167. <a name="l00147"></a>00147 <span class="comment">                                    be sent. */</span>
    168. 

  168. <a name="l00148"></a>00148 <span class="preprocessor">#if UIP_URGDATA &gt; 0</span>
    169. 

  169. <a name="l00149"></a>00149 <span class="preprocessor"></span><span class="keywordtype">void</span> *uip_urgdata;               <span class="comment">/* The uip_urgdata pointer points to</span>
    170. 

  170. <a name="l00150"></a>00150 <span class="comment">                                    urgent data (out-of-band data), if</span>
    171. 

  171. <a name="l00151"></a>00151 <span class="comment">                                    present. */</span>
    172. 

  172. <a name="l00152"></a>00152 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> uip_urglen, uip_surglen;
    173. 

  173. <a name="l00153"></a>00153 <span class="preprocessor">#endif </span><span class="comment">/* UIP_URGDATA &gt; 0 */</span>
    174. 

  174. <a name="l00154"></a>00154 
    175. 

  175. <a name="l00155"></a><a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">00155</a> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a>, <a class="code" href="a00150.html#g5b5615dc240daed20949c0fded2b4679">uip_slen</a>;
    176. 

  176. <a name="l00156"></a>00156                              <span class="comment">/* The uip_len is either 8 or 16 bits,</span>
    177. 

  177. <a name="l00157"></a>00157 <span class="comment">                                depending on the maximum packet</span>
    178. 

  178. <a name="l00158"></a>00158 <span class="comment">                                size. */</span>
    179. 

  179. <a name="l00159"></a>00159 
    180. 

  180. <a name="l00160"></a><a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">00160</a> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> <a class="code" href="a00150.html#gb4ef6b00924990e7a293f66715b6d1d1">uip_flags</a>;     <span class="comment">/* The uip_flags variable is used for</span>
    181. 

  181. <a name="l00161"></a>00161 <span class="comment">                                communication between the TCP/IP stack</span>
    182. 

  182. <a name="l00162"></a>00162 <span class="comment">                                and the application program. */</span>
    183. 

  183. <a name="l00163"></a><a class="code" href="a00150.html#g788ffac72342f6172343d7f8099cbe1a">00163</a> <span class="keyword">struct </span><a class="code" href="a00088.html">uip_conn</a> *<a class="code" href="a00088.html">uip_conn</a>;   <span class="comment">/* uip_conn always points to the current</span>
    184. 

  184. <a name="l00164"></a>00164 <span class="comment">                                connection. */</span>
    185. 

  185. <a name="l00165"></a>00165 
    186. 

  186. <a name="l00166"></a><a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">00166</a> <span class="keyword">struct </span><a class="code" href="a00150.html#g788ffac72342f6172343d7f8099cbe1a">uip_conn</a> <a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[<a class="code" href="a00153.html#gf5fe83be78b78b9e7d9e7f1e34ab1cc5">UIP_CONNS</a>];
    187. 

  187. <a name="l00167"></a>00167                              <span class="comment">/* The uip_conns array holds all TCP</span>
    188. 

  188. <a name="l00168"></a>00168 <span class="comment">                                connections. */</span>
    189. 

  189. <a name="l00169"></a><a class="code" href="a00150.html#g236d5c7872f59c8fe7b701c7252b976e">00169</a> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="a00150.html#g236d5c7872f59c8fe7b701c7252b976e">uip_listenports</a>[<a class="code" href="a00153.html#g8f4ebd8ef6c0ea665ed351d87fec09fd">UIP_LISTENPORTS</a>];
    190. 

  190. <a name="l00170"></a>00170                              <span class="comment">/* The uip_listenports list all currently</span>
    191. 

  191. <a name="l00171"></a>00171 <span class="comment">                                listning ports. */</span>
    192. 

  192. <a name="l00172"></a>00172 <span class="preprocessor">#if UIP_UDP</span>
    193. 

  193. <a name="l00173"></a><a class="code" href="a00150.html#g210f227119fc972e6222c9cb452e15a9">00173</a> <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00095.html">uip_udp_conn</a> *<a class="code" href="a00095.html">uip_udp_conn</a>;
    194. 

  194. <a name="l00174"></a><a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">00174</a> <span class="keyword">struct </span><a class="code" href="a00150.html#g210f227119fc972e6222c9cb452e15a9">uip_udp_conn</a> <a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">uip_udp_conns</a>[<a class="code" href="a00153.html#g196379ceb1219a99f4495e41ccc9bbfb">UIP_UDP_CONNS</a>];
    195. 

  195. <a name="l00175"></a>00175 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
    196. 

  196. <a name="l00176"></a>00176 
    197. 

  197. <a name="l00177"></a>00177 <span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> ipid;           <span class="comment">/* Ths ipid variable is an increasing</span>
    198. 

  198. <a name="l00178"></a>00178 <span class="comment">                                number that is used for the IP ID</span>
    199. 

  199. <a name="l00179"></a>00179 <span class="comment">                                field. */</span>
    200. 

  200. <a name="l00180"></a>00180 
    201. 

  201. <a name="l00181"></a><a class="code" href="a00150.html#g22f140b02c354dfebcc7ad481c3bcd68">00181</a> <span class="keywordtype">void</span> <a class="code" href="a00145.html#g22f140b02c354dfebcc7ad481c3bcd68">uip_setipid</a>(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <span class="keywordtype">id</span>) { ipid = id; }
    202. 

  202. <a name="l00182"></a>00182 
    203. 

  203. <a name="l00183"></a>00183 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> iss[4];          <span class="comment">/* The iss variable is used for the TCP</span>
    204. 

  204. <a name="l00184"></a>00184 <span class="comment">                                initial sequence number. */</span>
    205. 

  205. <a name="l00185"></a>00185 
    206. 

  206. <a name="l00186"></a>00186 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
    207. 

  207. <a name="l00187"></a>00187 <span class="preprocessor"></span><span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> lastport;       <span class="comment">/* Keeps track of the last port used for</span>
    208. 

  208. <a name="l00188"></a>00188 <span class="comment">                                a new connection. */</span>
    209. 

  209. <a name="l00189"></a>00189 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
    210. 

  210. <a name="l00190"></a>00190 
    211. 

  211. <a name="l00191"></a>00191 <span class="comment">/* Temporary variables. */</span>
    212. 

  212. <a name="l00192"></a><a class="code" href="a00150.html#g2a0cf5d86c58fab216414ce59bf1fea1">00192</a> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[4];
    213. 

  213. <a name="l00193"></a>00193 <span class="keyword">static</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> c, opt;
    214. 

  214. <a name="l00194"></a>00194 <span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> tmp16;
    215. 

  215. <a name="l00195"></a>00195 
    216. 

  216. <a name="l00196"></a>00196 <span class="comment">/* Structures and definitions. */</span>
    217. 

  217. <a name="l00197"></a><a class="code" href="a00150.html#g88e60aa2cf23e1c65d630701db08c743">00197</a> <span class="preprocessor">#define TCP_FIN 0x01</span>
    218. 

  218. <a name="l00198"></a><a class="code" href="a00150.html#g6020613f5062417d9811cfa837215c83">00198</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_SYN 0x02</span>
    219. 

  219. <a name="l00199"></a><a class="code" href="a00150.html#g5ca559def464ef20d8b1f7d32f2f160d">00199</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_RST 0x04</span>
    220. 

  220. <a name="l00200"></a><a class="code" href="a00150.html#g1320fd0006a2f70138bc2d0018dda829">00200</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_PSH 0x08</span>
    221. 

  221. <a name="l00201"></a><a class="code" href="a00150.html#g44b3b1ab31a403ba28ec135adfcbefef">00201</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_ACK 0x10</span>
    222. 

  222. <a name="l00202"></a><a class="code" href="a00150.html#gc84f499cba8a02fc0e306c10b2acabf0">00202</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_URG 0x20</span>
    223. 

  223. <a name="l00203"></a><a class="code" href="a00150.html#g1425d4a0c2760adb653a04c0fb137a8d">00203</a> <span class="preprocessor"></span><span class="preprocessor">#define TCP_CTL 0x3f</span>
    224. 

  224. <a name="l00204"></a>00204 <span class="preprocessor"></span>
    225. 

  225. <a name="l00205"></a><a class="code" href="a00150.html#g1215163245304bad20d6c5608ad75ab7">00205</a> <span class="preprocessor">#define TCP_OPT_END     0   </span><span class="comment">/* End of TCP options list */</span>
    226. 

  226. <a name="l00206"></a><a class="code" href="a00150.html#g9f1822e1d231235edacad691f3cb7bbb">00206</a> <span class="preprocessor">#define TCP_OPT_NOOP    1   </span><span class="comment">/* "No-operation" TCP option */</span>
    227. 

  227. <a name="l00207"></a><a class="code" href="a00150.html#g691688604655ea8943d15f14c60027d8">00207</a> <span class="preprocessor">#define TCP_OPT_MSS     2   </span><span class="comment">/* Maximum segment size TCP option */</span>
    228. 

  228. <a name="l00208"></a>00208 
    229. 

  229. <a name="l00209"></a><a class="code" href="a00150.html#g12f3bf821224b8e7b48a57ed3cea15cf">00209</a> <span class="preprocessor">#define TCP_OPT_MSS_LEN 4   </span><span class="comment">/* Length of TCP MSS option. */</span>
    230. 

  230. <a name="l00210"></a>00210 
    231. 

  231. <a name="l00211"></a><a class="code" href="a00150.html#g5c5b1834e497f53ad0ef947bbe9777fa">00211</a> <span class="preprocessor">#define ICMP_ECHO_REPLY 0</span>
    232. 

  232. <a name="l00212"></a><a class="code" href="a00150.html#gd58231410d58e34b455328b888a9e73c">00212</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMP_ECHO       8</span>
    233. 

  233. <a name="l00213"></a>00213 <span class="preprocessor"></span>
    234. 

  234. <a name="l00214"></a><a class="code" href="a00150.html#g207d17b633cd095120a74bc1f2257b17">00214</a> <span class="preprocessor">#define ICMP6_ECHO_REPLY             129</span>
    235. 

  235. <a name="l00215"></a><a class="code" href="a00150.html#g4cc3e223b63f27b546d62e9a258dba5a">00215</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_ECHO                   128</span>
    236. 

  236. <a name="l00216"></a><a class="code" href="a00150.html#g1cea57e3ea526f210b1068e6dcf7b4f4">00216</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_NEIGHBOR_SOLICITATION  135</span>
    237. 

  237. <a name="l00217"></a><a class="code" href="a00150.html#g62c03e0a308cc23929a80fe8d8f9dc1e">00217</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_NEIGHBOR_ADVERTISEMENT 136</span>
    238. 

  238. <a name="l00218"></a>00218 <span class="preprocessor"></span>
    239. 

  239. <a name="l00219"></a><a class="code" href="a00150.html#g1d3211dbbdfb22d6a47b60dddcf945e8">00219</a> <span class="preprocessor">#define ICMP6_FLAG_S (1 &lt;&lt; 6)</span>
    240. 

  240. <a name="l00220"></a>00220 <span class="preprocessor"></span>
    241. 

  241. <a name="l00221"></a><a class="code" href="a00150.html#g42288d5c3cf4b10becefec657f441e54">00221</a> <span class="preprocessor">#define ICMP6_OPTION_SOURCE_LINK_ADDRESS 1</span>
    242. 

  242. <a name="l00222"></a><a class="code" href="a00150.html#g8387881de3a8bfd3c0d57b9d04ac9b7e">00222</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMP6_OPTION_TARGET_LINK_ADDRESS 2</span>
    243. 

  243. <a name="l00223"></a>00223 <span class="preprocessor"></span>
    244. 

  244. <a name="l00224"></a>00224 
    245. 

  245. <a name="l00225"></a>00225 <span class="comment">/* Macros. */</span>
    246. 

  246. <a name="l00226"></a><a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">00226</a> <span class="preprocessor">#define BUF ((struct uip_tcpip_hdr *)&amp;uip_buf[UIP_LLH_LEN])</span>
    247. 

  247. <a name="l00227"></a><a class="code" href="a00150.html#g96544dedc1cdc71ad2ad54bf1d5e5433">00227</a> <span class="preprocessor"></span><span class="preprocessor">#define FBUF ((struct uip_tcpip_hdr *)&amp;uip_reassbuf[0])</span>
    248. 

  248. <a name="l00228"></a><a class="code" href="a00150.html#g4309376690872fa4beb4f025f5cc199b">00228</a> <span class="preprocessor"></span><span class="preprocessor">#define ICMPBUF ((struct uip_icmpip_hdr *)&amp;uip_buf[UIP_LLH_LEN])</span>
    249. 

  249. <a name="l00229"></a><a class="code" href="a00150.html#gb9435261753469accec0c9bf8a5a2686">00229</a> <span class="preprocessor"></span><span class="preprocessor">#define UDPBUF ((struct uip_udpip_hdr *)&amp;uip_buf[UIP_LLH_LEN])</span>
    250. 

  250. <a name="l00230"></a>00230 <span class="preprocessor"></span>
    251. 

  251. <a name="l00231"></a>00231 
    252. 

  252. <a name="l00232"></a>00232 <span class="preprocessor">#if UIP_STATISTICS == 1</span>
    253. 

  253. <a name="l00233"></a>00233 <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00093.html">uip_stats</a> <a class="code" href="a00150.html#g9ee50a40597e67fce96541ab56c3b712">uip_stat</a>;
    254. 

  254. <a name="l00234"></a>00234 <span class="preprocessor">#define UIP_STAT(s) s</span>
    255. 

  255. <a name="l00235"></a>00235 <span class="preprocessor"></span><span class="preprocessor">#else</span>
    256. 

  256. <a name="l00236"></a><a class="code" href="a00150.html#g9c0814ed491fa452ec97910c0728d410">00236</a> <span class="preprocessor"></span><span class="preprocessor">#define UIP_STAT(s)</span>
    257. 

  257. <a name="l00237"></a>00237 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* UIP_STATISTICS == 1 */</span>
    258. 

  258. <a name="l00238"></a>00238 
    259. 

  259. <a name="l00239"></a>00239 <span class="preprocessor">#if UIP_LOGGING == 1</span>
    260. 

  260. <a name="l00240"></a>00240 <span class="preprocessor"></span><span class="preprocessor">#include &lt;stdio.h&gt;</span>
    261. 

  261. <a name="l00241"></a>00241 <span class="keywordtype">void</span> <a class="code" href="a00153.html#gb58e1ceb7cb73ca2bcd73146b6c1b4e7">uip_log</a>(<span class="keywordtype">char</span> *msg);
    262. 

  262. <a name="l00242"></a>00242 <span class="preprocessor">#define UIP_LOG(m) uip_log(m)</span>
    263. 

  263. <a name="l00243"></a>00243 <span class="preprocessor"></span><span class="preprocessor">#else</span>
    264. 

  264. <a name="l00244"></a><a class="code" href="a00150.html#g013c3a06a8b58589a77f4a3442f89c2a">00244</a> <span class="preprocessor"></span><span class="preprocessor">#define UIP_LOG(m)</span>
    265. 

  265. <a name="l00245"></a>00245 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* UIP_LOGGING == 1 */</span>
    266. 

  266. <a name="l00246"></a>00246 
    267. 

  267. <a name="l00247"></a>00247 <span class="preprocessor">#if ! UIP_ARCH_ADD32</span>
    268. 

  268. <a name="l00248"></a>00248 <span class="preprocessor"></span><span class="keywordtype">void</span>
    269. 

  269. <a name="l00249"></a><a class="code" href="a00151.html#g6832e4d2d046536b6472f7ac92340f68">00249</a> <a class="code" href="a00150.html#g6832e4d2d046536b6472f7ac92340f68">uip_add32</a>(<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *op32, <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> op16)
    270. 

  270. <a name="l00250"></a>00250 {
    271. 

  271. <a name="l00251"></a>00251   uip_acc32[3] = op32[3] + (op16 &amp; 0xff);
    272. 

  272. <a name="l00252"></a>00252   uip_acc32[2] = op32[2] + (op16 &gt;&gt; 8);
    273. 

  273. <a name="l00253"></a>00253   uip_acc32[1] = op32[1];
    274. 

  274. <a name="l00254"></a>00254   uip_acc32[0] = op32[0];
    275. 

  275. <a name="l00255"></a>00255   
    276. 

  276. <a name="l00256"></a>00256   <span class="keywordflow">if</span>(uip_acc32[2] &lt; (op16 &gt;&gt; 8)) {
    277. 

  277. <a name="l00257"></a>00257     ++uip_acc32[1];
    278. 

  278. <a name="l00258"></a>00258     <span class="keywordflow">if</span>(uip_acc32[1] == 0) {
    279. 

  279. <a name="l00259"></a>00259       ++uip_acc32[0];
    280. 

  280. <a name="l00260"></a>00260     }
    281. 

  281. <a name="l00261"></a>00261   }
    282. 

  282. <a name="l00262"></a>00262   
    283. 

  283. <a name="l00263"></a>00263   
    284. 

  284. <a name="l00264"></a>00264   <span class="keywordflow">if</span>(uip_acc32[3] &lt; (op16 &amp; 0xff)) {
    285. 

  285. <a name="l00265"></a>00265     ++uip_acc32[2];
    286. 

  286. <a name="l00266"></a>00266     <span class="keywordflow">if</span>(uip_acc32[2] == 0) {
    287. 

  287. <a name="l00267"></a>00267       ++uip_acc32[1];
    288. 

  288. <a name="l00268"></a>00268       <span class="keywordflow">if</span>(uip_acc32[1] == 0) {
    289. 

  289. <a name="l00269"></a>00269         ++uip_acc32[0];
    290. 

  290. <a name="l00270"></a>00270       }
    291. 

  291. <a name="l00271"></a>00271     }
    292. 

  292. <a name="l00272"></a>00272   }
    293. 

  293. <a name="l00273"></a>00273 }
    294. 

  294. <a name="l00274"></a>00274 
    295. 

  295. <a name="l00275"></a>00275 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ARCH_ADD32 */</span>
    296. 

  296. <a name="l00276"></a>00276 
    297. 

  297. <a name="l00277"></a>00277 <span class="preprocessor">#if ! UIP_ARCH_CHKSUM</span>
    298. 

  298. <a name="l00278"></a>00278 <span class="preprocessor"></span><span class="comment">/*---------------------------------------------------------------------------*/</span>
    299. 

  299. <a name="l00279"></a>00279 <span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
    300. 

  300. <a name="l00280"></a>00280 chksum(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> sum, <span class="keyword">const</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *data, <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> len)
    301. 

  301. <a name="l00281"></a>00281 {
    302. 

  302. <a name="l00282"></a>00282   <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> t;
    303. 

  303. <a name="l00283"></a>00283   <span class="keyword">const</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *dataptr;
    304. 

  304. <a name="l00284"></a>00284   <span class="keyword">const</span> <a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *last_byte;
    305. 

  305. <a name="l00285"></a>00285 
    306. 

  306. <a name="l00286"></a>00286   dataptr = data;
    307. 

  307. <a name="l00287"></a>00287   last_byte = data + len - 1;
    308. 

  308. <a name="l00288"></a>00288   
    309. 

  309. <a name="l00289"></a>00289   <span class="keywordflow">while</span>(dataptr &lt; last_byte) {  <span class="comment">/* At least two more bytes */</span>
    310. 

  310. <a name="l00290"></a>00290     t = (dataptr[0] &lt;&lt; 8) + dataptr[1];
    311. 

  311. <a name="l00291"></a>00291     sum += t;
    312. 

  312. <a name="l00292"></a>00292     <span class="keywordflow">if</span>(sum &lt; t) {
    313. 

  313. <a name="l00293"></a>00293       sum++;            <span class="comment">/* carry */</span>
    314. 

  314. <a name="l00294"></a>00294     }
    315. 

  315. <a name="l00295"></a>00295     dataptr += 2;
    316. 

  316. <a name="l00296"></a>00296   }
    317. 

  317. <a name="l00297"></a>00297   
    318. 

  318. <a name="l00298"></a>00298   <span class="keywordflow">if</span>(dataptr == last_byte) {
    319. 

  319. <a name="l00299"></a>00299     t = (dataptr[0] &lt;&lt; 8) + 0;
    320. 

  320. <a name="l00300"></a>00300     sum += t;
    321. 

  321. <a name="l00301"></a>00301     <span class="keywordflow">if</span>(sum &lt; t) {
    322. 

  322. <a name="l00302"></a>00302       sum++;            <span class="comment">/* carry */</span>
    323. 

  323. <a name="l00303"></a>00303     }
    324. 

  324. <a name="l00304"></a>00304   }
    325. 

  325. <a name="l00305"></a>00305 
    326. 

  326. <a name="l00306"></a>00306   <span class="comment">/* Return sum in host byte order. */</span>
    327. 

  327. <a name="l00307"></a>00307   <span class="keywordflow">return</span> sum;
    328. 

  328. <a name="l00308"></a>00308 }
    329. 

  329. <a name="l00309"></a>00309 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    330. 

  330. <a name="l00310"></a>00310 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
    331. 

  331. <a name="l00311"></a><a class="code" href="a00150.html#gb6683dd83fe1c8de9a24086d4b69e907">00311</a> <a class="code" href="a00150.html#gb6683dd83fe1c8de9a24086d4b69e907">uip_chksum</a>(<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> *data, <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> len)
    332. 

  332. <a name="l00312"></a>00312 {
    333. 

  333. <a name="l00313"></a>00313   <span class="keywordflow">return</span> <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(chksum(0, (<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)data, len));
    334. 

  334. <a name="l00314"></a>00314 }
    335. 

  335. <a name="l00315"></a>00315 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    336. 

  336. <a name="l00316"></a>00316 <span class="preprocessor">#ifndef UIP_ARCH_IPCHKSUM</span>
    337. 

  337. <a name="l00317"></a>00317 <span class="preprocessor"></span><a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
    338. 

  338. <a name="l00318"></a><a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">00318</a> <a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>(<span class="keywordtype">void</span>)
    339. 

  339. <a name="l00319"></a>00319 {
    340. 

  340. <a name="l00320"></a>00320   <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> sum;
    341. 

  341. <a name="l00321"></a>00321 
    342. 

  342. <a name="l00322"></a>00322   sum = chksum(0, &amp;uip_buf[<a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a>], <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>);
    343. 

  343. <a name="l00323"></a>00323   <a class="code" href="a00135.html#534d9e416324fb8ecca6b9cb4b1f6a6a">DEBUG_PRINTF</a>(<span class="stringliteral">"uip_ipchksum: sum 0x%04x\n"</span>, sum);
    344. 

  344. <a name="l00324"></a>00324   <span class="keywordflow">return</span> (sum == 0) ? 0xffff : <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(sum);
    345. 

  345. <a name="l00325"></a>00325 }
    346. 

  346. <a name="l00326"></a>00326 <span class="preprocessor">#endif</span>
    347. 

  347. <a name="l00327"></a>00327 <span class="preprocessor"></span><span class="comment">/*---------------------------------------------------------------------------*/</span>
    348. 

  348. <a name="l00328"></a>00328 <span class="keyword">static</span> <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
    349. 

  349. <a name="l00329"></a>00329 upper_layer_chksum(<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto)
    350. 

  350. <a name="l00330"></a>00330 {
    351. 

  351. <a name="l00331"></a>00331   <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> upper_layer_len;
    352. 

  352. <a name="l00332"></a>00332   <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> sum;
    353. 

  353. <a name="l00333"></a>00333   
    354. 

  354. <a name="l00334"></a>00334 <span class="preprocessor">#if UIP_CONF_IPV6</span>
    355. 

  355. <a name="l00335"></a>00335 <span class="preprocessor"></span>  upper_layer_len = (((<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>)(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0]) &lt;&lt; 8) + <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1]);
    356. 

  356. <a name="l00336"></a>00336 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
    357. 

  357. <a name="l00337"></a>00337   upper_layer_len = (((<a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>)(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0]) &lt;&lt; 8) + <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1]) - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>;
    358. 

  358. <a name="l00338"></a>00338 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
    359. 

  359. <a name="l00339"></a>00339   
    360. 

  360. <a name="l00340"></a>00340   <span class="comment">/* First sum pseudoheader. */</span>
    361. 

  361. <a name="l00341"></a>00341   
    362. 

  362. <a name="l00342"></a>00342   <span class="comment">/* IP protocol and length fields. This addition cannot carry. */</span>
    363. 

  363. <a name="l00343"></a>00343   sum = upper_layer_len + proto;
    364. 

  364. <a name="l00344"></a>00344   <span class="comment">/* Sum IP source and destination addresses. */</span>
    365. 

  365. <a name="l00345"></a>00345   sum = chksum(sum, (<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)&amp;<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;srcipaddr[0], 2 * <span class="keyword">sizeof</span>(<a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a>));
    366. 

  366. <a name="l00346"></a>00346 
    367. 

  367. <a name="l00347"></a>00347   <span class="comment">/* Sum TCP header and data. */</span>
    368. 

  368. <a name="l00348"></a>00348   sum = chksum(sum, &amp;uip_buf[<a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a> + <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a>],
    369. 

  369. <a name="l00349"></a>00349                upper_layer_len);
    370. 

  370. <a name="l00350"></a>00350     
    371. 

  371. <a name="l00351"></a>00351   <span class="keywordflow">return</span> (sum == 0) ? 0xffff : <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(sum);
    372. 

  372. <a name="l00352"></a>00352 }
    373. 

  373. <a name="l00353"></a>00353 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    374. 

  374. <a name="l00354"></a>00354 <span class="preprocessor">#if UIP_CONF_IPV6</span>
    375. 

  375. <a name="l00355"></a>00355 <span class="preprocessor"></span><a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
    376. 

  376. <a name="l00356"></a>00356 uip_icmp6chksum(<span class="keywordtype">void</span>)
    377. 

  377. <a name="l00357"></a>00357 {
    378. 

  378. <a name="l00358"></a>00358   <span class="keywordflow">return</span> upper_layer_chksum(<a class="code" href="a00150.html#gad0321f4c570f9983c6de81ece3ddc20">UIP_PROTO_ICMP6</a>);
    379. 

  379. <a name="l00359"></a>00359   
    380. 

  380. <a name="l00360"></a>00360 }
    381. 

  381. <a name="l00361"></a>00361 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
    382. 

  382. <a name="l00362"></a>00362 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    383. 

  383. <a name="l00363"></a>00363 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
    384. 

  384. <a name="l00364"></a><a class="code" href="a00150.html#g85b65e38aa74eba18979156f97a94a87">00364</a> <a class="code" href="a00150.html#g85b65e38aa74eba18979156f97a94a87">uip_tcpchksum</a>(<span class="keywordtype">void</span>)
    385. 

  385. <a name="l00365"></a>00365 {
    386. 

  386. <a name="l00366"></a>00366   <span class="keywordflow">return</span> upper_layer_chksum(<a class="code" href="a00150.html#g517c770991459cc62dc009c0d3875c6a">UIP_PROTO_TCP</a>);
    387. 

  387. <a name="l00367"></a>00367 }
    388. 

  388. <a name="l00368"></a>00368 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    389. 

  389. <a name="l00369"></a>00369 <span class="preprocessor">#if UIP_UDP_CHECKSUMS</span>
    390. 

  390. <a name="l00370"></a>00370 <span class="preprocessor"></span><a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a>
    391. 

  391. <a name="l00371"></a>00371 <a class="code" href="a00150.html#g7023a34ba9e9d03b5fbedbcb32924453">uip_udpchksum</a>(<span class="keywordtype">void</span>)
    392. 

  392. <a name="l00372"></a>00372 {
    393. 

  393. <a name="l00373"></a>00373   <span class="keywordflow">return</span> upper_layer_chksum(<a class="code" href="a00150.html#gf72d7b9a737707dcfb2c41fec2b6792e">UIP_PROTO_UDP</a>);
    394. 

  394. <a name="l00374"></a>00374 }
    395. 

  395. <a name="l00375"></a>00375 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP_CHECKSUMS */</span>
    396. 

  396. <a name="l00376"></a>00376 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ARCH_CHKSUM */</span>
    397. 

  397. <a name="l00377"></a>00377 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    398. 

  398. <a name="l00378"></a>00378 <span class="keywordtype">void</span>
    399. 

  399. <a name="l00379"></a><a class="code" href="a00150.html#gc48ed5f0d27721ef62a3ed02a5ad8d2e">00379</a> <a class="code" href="a00145.html#gc48ed5f0d27721ef62a3ed02a5ad8d2e">uip_init</a>(<span class="keywordtype">void</span>)
    400. 

  400. <a name="l00380"></a>00380 {
    401. 

  401. <a name="l00381"></a>00381   <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#g8f4ebd8ef6c0ea665ed351d87fec09fd">UIP_LISTENPORTS</a>; ++c) {
    402. 

  402. <a name="l00382"></a>00382     uip_listenports[c] = 0;
    403. 

  403. <a name="l00383"></a>00383   }
    404. 

  404. <a name="l00384"></a>00384   <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#gf5fe83be78b78b9e7d9e7f1e34ab1cc5">UIP_CONNS</a>; ++c) {
    405. 

  405. <a name="l00385"></a>00385     <a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[c].tcpstateflags = <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a>;
    406. 

  406. <a name="l00386"></a>00386   }
    407. 

  407. <a name="l00387"></a>00387 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
    408. 

  408. <a name="l00388"></a>00388 <span class="preprocessor"></span>  lastport = 1024;
    409. 

  409. <a name="l00389"></a>00389 <span class="preprocessor">#endif </span><span class="comment">/* UIP_ACTIVE_OPEN */</span>
    410. 

  410. <a name="l00390"></a>00390 
    411. 

  411. <a name="l00391"></a>00391 <span class="preprocessor">#if UIP_UDP</span>
    412. 

  412. <a name="l00392"></a>00392 <span class="preprocessor"></span>  <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#g196379ceb1219a99f4495e41ccc9bbfb">UIP_UDP_CONNS</a>; ++c) {
    413. 

  413. <a name="l00393"></a>00393     <a class="code" href="a00150.html#geb533744817cf6695d75293369c2248b">uip_udp_conns</a>[c].lport = 0;
    414. 

  414. <a name="l00394"></a>00394   }
    415. 

  415. <a name="l00395"></a>00395 <span class="preprocessor">#endif </span><span class="comment">/* UIP_UDP */</span>
    416. 

  416. <a name="l00396"></a>00396   
    417. 

  417. <a name="l00397"></a>00397 
    418. 

  418. <a name="l00398"></a>00398   <span class="comment">/* IPv4 initialization. */</span>
    419. 

  419. <a name="l00399"></a>00399 <span class="preprocessor">#if UIP_FIXEDADDR == 0</span>
    420. 

  420. <a name="l00400"></a>00400 <span class="preprocessor"></span>  <span class="comment">/*  uip_hostaddr[0] = uip_hostaddr[1] = 0;*/</span>
    421. 

  421. <a name="l00401"></a>00401 <span class="preprocessor">#endif </span><span class="comment">/* UIP_FIXEDADDR */</span>
    422. 

  422. <a name="l00402"></a>00402 
    423. 

  423. <a name="l00403"></a>00403 }
    424. 

  424. <a name="l00404"></a>00404 <span class="comment">/*---------------------------------------------------------------------------*/</span>
    425. 

  425. <a name="l00405"></a>00405 <span class="preprocessor">#if UIP_ACTIVE_OPEN</span>
    426. 

  426. <a name="l00406"></a>00406 <span class="preprocessor"></span><span class="keyword">struct </span><a class="code" href="a00150.html#g788ffac72342f6172343d7f8099cbe1a">uip_conn</a> *
    427. 

  427. <a name="l00407"></a><a class="code" href="a00150.html#g9c24fba2cd8f7f62accb0a0d5bbe4dad">00407</a> <a class="code" href="a00147.html#g8096b0c4b543dc408f4dd031ddae7240">uip_connect</a>(<a class="code" href="a00150.html#g1ef35301f43a5bbb9f89f07b5a36b9a0">uip_ipaddr_t</a> *<a class="code" href="a00088.html#79510aa86d3fa0a0fc6cfc49b1da7279">ripaddr</a>, <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="a00088.html#1df6aa054ef2fa634ac4c6f418228285">rport</a>)
    428. 

  428. <a name="l00408"></a>00408 {
    429. 

  429. <a name="l00409"></a>00409   <span class="keyword">register</span> <span class="keyword">struct </span><a class="code" href="a00150.html#g788ffac72342f6172343d7f8099cbe1a">uip_conn</a> *conn, *cconn;
    430. 

  430. <a name="l00410"></a>00410   
    431. 

  431. <a name="l00411"></a>00411   <span class="comment">/* Find an unused local port. */</span>
    432. 

  432. <a name="l00412"></a>00412  again:
    433. 

  433. <a name="l00413"></a>00413   ++lastport;
    434. 

  434. <a name="l00414"></a>00414 
    435. 

  435. <a name="l00415"></a>00415   <span class="keywordflow">if</span>(lastport &gt;= 32000) {
    436. 

  436. <a name="l00416"></a>00416     lastport = 4096;
    437. 

  437. <a name="l00417"></a>00417   }
    438. 

  438. <a name="l00418"></a>00418 
    439. 

  439. <a name="l00419"></a>00419   <span class="comment">/* Check if this port is already in use, and if so try to find</span>
    440. 

  440. <a name="l00420"></a>00420 <span class="comment">     another one. */</span>
    441. 

  441. <a name="l00421"></a>00421   <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#gf5fe83be78b78b9e7d9e7f1e34ab1cc5">UIP_CONNS</a>; ++c) {
    442. 

  442. <a name="l00422"></a>00422     conn = &amp;<a class="code" href="a00150.html#gf703683056d2bfa5c81fa157dcb20fe2">uip_conns</a>[c];
    443. 

  443. <a name="l00423"></a>00423     <span class="keywordflow">if</span>(conn-&gt;<a class="code" href="a00088.html#a5f58074435cdc180f17de69651beebd">tcpstateflags</a> != <a class="code" href="a00150.html#g28eda870cff3d8e3cf2949e6f57a502b">UIP_CLOSED</a> &amp;&amp;
    444. 

  444. <a name="l00424"></a>00424        conn-&gt;<a class="code" href="a00088.html#0cd09beee671e7e9efb0b4aced10249e">lport</a> == <a class="code" href="a00148.html#ga22b04cac8cf283ca12f028578bebc06">htons</a>(lastport)) {
    445. 

  445. <a name="l00425"></a>00425       <span class="keywordflow">goto</span> again;
    446. 

  446. <a name="l00426"></a>00426     }
    447. 

  447. <a name="l00427"></a>00427   }
    448. 

  448. <a name="l00428"></a>00428 
    449. 

  449. <a name="l00429"></a>00429   conn = 0;
    450. 

  450. <a name="l00430"></a>00430   <span class="keywordflow">for</span>(c = 0; c &lt; <a class="code" href="a00153.html#gf5fe83be78b78b9e7d9e7f1e34ab1cc5">UIP_CONNS</a>; ++c) {
    451. 

  451. <a name="l00431"></a>00431     cconn = &amp;<a class="code" href="a00150.html#gf70368305…
    452.

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