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  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>
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    33. 

  33. <h1>sicslowpan.c</h1><a href="a00388.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 sicslowpan</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"> * Copyright (c) 2008, Swedish Institute of Computer Science.</span>
    39. 

  39. <a name="l00007"></a>00007 <span class="comment"> * All rights reserved.</span>
    40. 

  40. <a name="l00008"></a>00008 <span class="comment"> *</span>
    41. 

  41. <a name="l00009"></a>00009 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
    42. 

  42. <a name="l00010"></a>00010 <span class="comment"> * modification, are permitted provided that the following conditions</span>
    43. 

  43. <a name="l00011"></a>00011 <span class="comment"> * are met:</span>
    44. 

  44. <a name="l00012"></a>00012 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
    45. 

  45. <a name="l00013"></a>00013 <span class="comment"> *    notice, this list of conditions and the following disclaimer.</span>
    46. 

  46. <a name="l00014"></a>00014 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
    47. 

  47. <a name="l00015"></a>00015 <span class="comment"> *    notice, this list of conditions and the following disclaimer in the</span>
    48. 

  48. <a name="l00016"></a>00016 <span class="comment"> *    documentation and/or other materials provided with the distribution.</span>
    49. 

  49. <a name="l00017"></a>00017 <span class="comment"> * 3. Neither the name of the Institute nor the names of its contributors</span>
    50. 

  50. <a name="l00018"></a>00018 <span class="comment"> *    may be used to endorse or promote products derived from this software</span>
    51. 

  51. <a name="l00019"></a>00019 <span class="comment"> *    without specific prior written permission.</span>
    52. 

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

  53. <a name="l00021"></a>00021 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS&apos;&apos; AND</span>
    54. 

  54. <a name="l00022"></a>00022 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
    55. 

  55. <a name="l00023"></a>00023 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
    56. 

  56. <a name="l00024"></a>00024 <span class="comment"> * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE</span>
    57. 

  57. <a name="l00025"></a>00025 <span class="comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
    58. 

  58. <a name="l00026"></a>00026 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS</span>
    59. 

  59. <a name="l00027"></a>00027 <span class="comment"> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</span>
    60. 

  60. <a name="l00028"></a>00028 <span class="comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span>
    61. 

  61. <a name="l00029"></a>00029 <span class="comment"> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY</span>
    62. 

  62. <a name="l00030"></a>00030 <span class="comment"> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF</span>
    63. 

  63. <a name="l00031"></a>00031 <span class="comment"> * SUCH DAMAGE.</span>
    64. 

  64. <a name="l00032"></a>00032 <span class="comment"> *</span>
    65. 

  65. <a name="l00033"></a>00033 <span class="comment"> * This file is part of the Contiki operating system.</span>
    66. 

  66. <a name="l00034"></a>00034 <span class="comment"> *</span>
    67. 

  67. <a name="l00035"></a>00035 <span class="comment"> * $Id: sicslowpan.c,v 1.52 2011/01/04 20:22:21 joxe Exp $</span>
    68. 

  68. <a name="l00036"></a>00036 <span class="comment"> */</span><span class="comment"></span>
    69. 

  69. <a name="l00037"></a>00037 <span class="comment">/**</span>
    70. 

  70. <a name="l00038"></a>00038 <span class="comment"> * \file</span>
    71. 

  71. <a name="l00039"></a>00039 <span class="comment"> *         6lowpan implementation (RFC4944 and draft-ietf-6lowpan-hc-06)</span>
    72. 

  72. <a name="l00040"></a>00040 <span class="comment"> *</span>
    73. 

  73. <a name="l00041"></a>00041 <span class="comment"> * \author Adam Dunkels &lt;adam@sics.se&gt;</span>
    74. 

  74. <a name="l00042"></a>00042 <span class="comment"> * \author Nicolas Tsiftes &lt;nvt@sics.se&gt;</span>
    75. 

  75. <a name="l00043"></a>00043 <span class="comment"> * \author Niclas Finne &lt;nfi@sics.se&gt;</span>
    76. 

  76. <a name="l00044"></a>00044 <span class="comment"> * \author Mathilde Durvy &lt;mdurvy@cisco.com&gt;</span>
    77. 

  77. <a name="l00045"></a>00045 <span class="comment"> * \author Julien Abeille &lt;jabeille@cisco.com&gt;</span>
    78. 

  78. <a name="l00046"></a>00046 <span class="comment"> * \author Joakim Eriksson &lt;joakime@sics.se&gt;</span>
    79. 

  79. <a name="l00047"></a>00047 <span class="comment"> * \author Joel Hoglund &lt;joel@sics.se&gt;</span>
    80. 

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

  81. <a name="l00049"></a>00049 <span class="comment"></span>
    82. 

  82. <a name="l00050"></a>00050 <span class="comment">/**</span>
    83. 

  83. <a name="l00051"></a>00051 <span class="comment"> * FOR HC-06 COMPLIANCE TODO:</span>
    84. 

  84. <a name="l00052"></a>00052 <span class="comment"> * -Add compression options to UDP, currently only supports</span>
    85. 

  85. <a name="l00053"></a>00053 <span class="comment"> *  both ports compressed or both ports elided</span>
    86. 

  86. <a name="l00054"></a>00054 <span class="comment"> *  </span>
    87. 

  87. <a name="l00055"></a>00055 <span class="comment"> * -Verify TC/FL compression works</span>
    88. 

  88. <a name="l00056"></a>00056 <span class="comment"> *  </span>
    89. 

  89. <a name="l00057"></a>00057 <span class="comment"> * -Add stateless multicast option</span>
    90. 

  90. <a name="l00058"></a>00058 <span class="comment"> */</span>
    91. 

  91. <a name="l00059"></a>00059 
    92. 

  92. <a name="l00060"></a>00060 <span class="preprocessor">#include &lt;string.h&gt;</span>
    93. 

  93. <a name="l00061"></a>00061 
    94. 

  94. <a name="l00062"></a>00062 <span class="preprocessor">#include &quot;contiki.h&quot;</span>
    95. 

  95. <a name="l00063"></a>00063 <span class="preprocessor">#include &quot;dev/watchdog.h&quot;</span>
    96. 

  96. <a name="l00064"></a>00064 <span class="preprocessor">#include &quot;<a class="code" href="a00395.html" title="Header for the Contiki/uIP interface.">net/tcpip.h</a>&quot;</span>
    97. 

  97. <a name="l00065"></a>00065 <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>
    98. 

  98. <a name="l00066"></a>00066 <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>
    99. 

  99. <a name="l00067"></a>00067 <span class="preprocessor">#include &quot;<a class="code" href="a00310.html" title="Header file for the Rime stack.">net/rime.h</a>&quot;</span>
    100. 

  100. <a name="l00068"></a>00068 <span class="preprocessor">#include &quot;<a class="code" href="a00389.html" title="Header file for the 6lowpan implementation (RFC4944 and draft-hui-6lowpan-hc-01)...">net/sicslowpan.h</a>&quot;</span>
    101. 

  101. <a name="l00069"></a>00069 <span class="preprocessor">#include &quot;<a class="code" href="a00294.html" title="Declarations for the neighbor information module.">net/neighbor-info.h</a>&quot;</span>
    102. 

  102. <a name="l00070"></a>00070 <span class="preprocessor">#include &quot;<a class="code" href="a00296.html" title="Include file for the Contiki low-layer network stack (NETSTACK).">net/netstack.h</a>&quot;</span>
    103. 

  103. <a name="l00071"></a>00071 
    104. 

  104. <a name="l00072"></a><a class="code" href="a01680.html#gad72dbcf6d0153db1b8d8a58001feed83">00072</a> <span class="preprocessor">#define DEBUG 0</span>
    105. 

  105. <a name="l00073"></a>00073 <span class="preprocessor"></span><span class="preprocessor">#if DEBUG</span>
    106. 

  106. <a name="l00074"></a>00074 <span class="preprocessor"></span><span class="comment">/* PRINTFI and PRINTFO are defined for input and output to debug one without changing the timing of the other */</span>
    107. 

  107. <a name="l00075"></a>00075 <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> p;
    108. 

  108. <a name="l00076"></a>00076 <span class="preprocessor">#include &lt;stdio.h&gt;</span>
    109. 

  109. <a name="l00077"></a>00077 <span class="preprocessor">#define PRINTF(...) printf(__VA_ARGS__)</span>
    110. 

  110. <a name="l00078"></a>00078 <span class="preprocessor"></span><span class="preprocessor">#define PRINTFI(...) printf(__VA_ARGS__)</span>
    111. 

  111. <a name="l00079"></a>00079 <span class="preprocessor"></span><span class="preprocessor">#define PRINTFO(...) printf(__VA_ARGS__)</span>
    112. 

  112. <a name="l00080"></a>00080 <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>
    113. 

  113. <a name="l00081"></a>00081 <span class="preprocessor"></span><span class="preprocessor">#define PRINTLLADDR(lladdr) PRINTF(&quot; %02x:%02x:%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],lladdr-&gt;addr[6], lladdr-&gt;addr[7])</span>
    114. 

  114. <a name="l00082"></a>00082 <span class="preprocessor"></span><span class="preprocessor">#define PRINTPACKETBUF() PRINTF(&quot;RIME buffer: &quot;); for(p = 0; p &lt; packetbuf_datalen(); p++){PRINTF(&quot;%.2X&quot;, *(rime_ptr + p));} PRINTF(&quot;\n&quot;)</span>
    115. 

  115. <a name="l00083"></a>00083 <span class="preprocessor"></span><span class="preprocessor">#define PRINTUIPBUF() PRINTF(&quot;UIP buffer: &quot;); for(p = 0; p &lt; uip_len; p++){PRINTF(&quot;%.2X&quot;, uip_buf[p]);}PRINTF(&quot;\n&quot;)</span>
    116. 

  116. <a name="l00084"></a>00084 <span class="preprocessor"></span><span class="preprocessor">#define PRINTSICSLOWPANBUF() PRINTF(&quot;SICSLOWPAN buffer: &quot;); for(p = 0; p &lt; sicslowpan_len; p++){PRINTF(&quot;%.2X&quot;, sicslowpan_buf[p]);}PRINTF(&quot;\n&quot;)</span>
    117. 

  117. <a name="l00085"></a>00085 <span class="preprocessor"></span><span class="preprocessor">#else</span>
    118. 

  118. <a name="l00086"></a>00086 <span class="preprocessor"></span><span class="preprocessor">#define PRINTF(...)</span>
    119. 

  119. <a name="l00087"></a>00087 <span class="preprocessor"></span><span class="preprocessor">#define PRINTFI(...)</span>
    120. 

  120. <a name="l00088"></a>00088 <span class="preprocessor"></span><span class="preprocessor">#define PRINTFO(...)</span>
    121. 

  121. <a name="l00089"></a>00089 <span class="preprocessor"></span><span class="preprocessor">#define PRINT6ADDR(addr)</span>
    122. 

  122. <a name="l00090"></a>00090 <span class="preprocessor"></span><span class="preprocessor">#define PRINTLLADDR(lladdr)</span>
    123. 

  123. <a name="l00091"></a>00091 <span class="preprocessor"></span><span class="preprocessor">#define PRINTPACKETBUF()</span>
    124. 

  124. <a name="l00092"></a>00092 <span class="preprocessor"></span><span class="preprocessor">#define PRINTUIPBUF()</span>
    125. 

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

  126. <a name="l00094"></a>00094 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* DEBUG == 1*/</span>
    127. 

  127. <a name="l00095"></a>00095 
    128. 

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

  129. <a name="l00097"></a>00097 <span class="preprocessor"></span><span class="preprocessor">#include &lt;stdio.h&gt;</span>
    130. 

  130. <a name="l00098"></a>00098 <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);
    131. 

  131. <a name="l00099"></a>00099 <span class="preprocessor">#define UIP_LOG(m) uip_log(m)</span>
    132. 

  132. <a name="l00100"></a>00100 <span class="preprocessor"></span><span class="preprocessor">#else</span>
    133. 

  133. <a name="l00101"></a>00101 <span class="preprocessor"></span><span class="preprocessor">#define UIP_LOG(m)</span>
    134. 

  134. <a name="l00102"></a>00102 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* UIP_LOGGING == 1 */</span>
    135. 

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

  136. <a name="l00104"></a>00104 <span class="preprocessor">#ifdef SICSLOWPAN_CONF_MAX_MAC_TRANSMISSIONS</span>
    137. 

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

  138. <a name="l00106"></a>00106 <span class="preprocessor"></span><span class="preprocessor">#else</span>
    139. 

  139. <a name="l00107"></a>00107 <span class="preprocessor"></span><span class="preprocessor">#define SICSLOWPAN_MAX_MAC_TRANSMISSIONS 4</span>
    140. 

  140. <a name="l00108"></a>00108 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
    141. 

  141. <a name="l00109"></a>00109 <span class="preprocessor"></span>
    142. 

  142. <a name="l00110"></a>00110 <span class="preprocessor">#ifndef SICSLOWPAN_COMPRESSION</span>
    143. 

  143. <a name="l00111"></a>00111 <span class="preprocessor"></span><span class="preprocessor">#ifdef SICSLOWPAN_CONF_COMPRESSION</span>
    144. 

  144. <a name="l00112"></a>00112 <span class="preprocessor"></span><span class="preprocessor">#define SICSLOWPAN_COMPRESSION SICSLOWPAN_CONF_COMPRESSION</span>
    145. 

  145. <a name="l00113"></a>00113 <span class="preprocessor"></span><span class="preprocessor">#else</span>
    146. 

  146. <a name="l00114"></a>00114 <span class="preprocessor"></span><span class="preprocessor">#define SICSLOWPAN_COMPRESSION SICSLOWPAN_COMPRESSION_IPV6</span>
    147. 

  147. <a name="l00115"></a>00115 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* SICSLOWPAN_CONF_COMPRESSION */</span>
    148. 

  148. <a name="l00116"></a>00116 <span class="preprocessor">#endif </span><span class="comment">/* SICSLOWPAN_COMPRESSION */</span>
    149. 

  149. <a name="l00117"></a>00117 
    150. 

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

  151. <a name="l00119"></a>00119 <span class="preprocessor"></span><span class="comment">/* Default is to use neighbor info updates if using RPL */</span>
    152. 

  152. <a name="l00120"></a>00120 <span class="preprocessor">#define SICSLOWPAN_CONF_NEIGHBOR_INFO UIP_CONF_IPV6_RPL</span>
    153. 

  153. <a name="l00121"></a>00121 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* SICSLOWPAN_CONF_NEIGHBOR_INFO */</span>
    154. 

  154. <a name="l00122"></a>00122 
    155. 

  155. <a name="l00123"></a>00123 <span class="preprocessor">#define GET16(ptr,index) (((uint16_t)((ptr)[index] &lt;&lt; 8)) | ((ptr)[(index) + 1]))</span>
    156. 

  156. <a name="l00124"></a>00124 <span class="preprocessor"></span><span class="preprocessor">#define SET16(ptr,index,value) do {     \</span>
    157. 

  157. <a name="l00125"></a>00125 <span class="preprocessor">  (ptr)[index] = ((value) &gt;&gt; 8) &amp; 0xff; \</span>
    158. 

  158. <a name="l00126"></a>00126 <span class="preprocessor">  (ptr)[index + 1] = (value) &amp; 0xff;    \</span>
    159. 

  159. <a name="l00127"></a>00127 <span class="preprocessor">} while(0)</span>
    160. 

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

  161. <a name="l00129"></a>00129 <span class="comment">/** \name Pointers in the rime buffer</span>
    162. 

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

  163. <a name="l00131"></a>00131 <span class="comment"> */</span>
    164. 

  164. <a name="l00132"></a>00132 <span class="preprocessor">#define RIME_FRAG_PTR           (rime_ptr)</span>
    165. 

  165. <a name="l00133"></a>00133 <span class="preprocessor"></span><span class="preprocessor">#define RIME_FRAG_DISPATCH_SIZE 0   </span><span class="comment">/* 16 bit */</span>
    166. 

  166. <a name="l00134"></a>00134 <span class="preprocessor">#define RIME_FRAG_TAG           2   </span><span class="comment">/* 16 bit */</span>
    167. 

  167. <a name="l00135"></a>00135 <span class="preprocessor">#define RIME_FRAG_OFFSET        4   </span><span class="comment">/* 8 bit */</span>
    168. 

  168. <a name="l00136"></a>00136 
    169. 

  169. <a name="l00137"></a>00137 <span class="comment">/* define the buffer as a byte array */</span>
    170. 

  170. <a name="l00138"></a>00138 <span class="preprocessor">#define RIME_IPHC_BUF              ((uint8_t *)(rime_ptr + rime_hdr_len))</span>
    171. 

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

  172. <a name="l00140"></a>00140 <span class="preprocessor">#define RIME_HC1_PTR            (rime_ptr + rime_hdr_len)</span>
    173. 

  173. <a name="l00141"></a>00141 <span class="preprocessor"></span><span class="preprocessor">#define RIME_HC1_DISPATCH       0 </span><span class="comment">/* 8 bit */</span>
    174. 

  174. <a name="l00142"></a>00142 <span class="preprocessor">#define RIME_HC1_ENCODING       1 </span><span class="comment">/* 8 bit */</span>
    175. 

  175. <a name="l00143"></a>00143 <span class="preprocessor">#define RIME_HC1_TTL            2 </span><span class="comment">/* 8 bit */</span>
    176. 

  176. <a name="l00144"></a>00144 
    177. 

  177. <a name="l00145"></a>00145 <span class="preprocessor">#define RIME_HC1_HC_UDP_PTR           (rime_ptr + rime_hdr_len)</span>
    178. 

  178. <a name="l00146"></a>00146 <span class="preprocessor"></span><span class="preprocessor">#define RIME_HC1_HC_UDP_DISPATCH      0 </span><span class="comment">/* 8 bit */</span>
    179. 

  179. <a name="l00147"></a>00147 <span class="preprocessor">#define RIME_HC1_HC_UDP_HC1_ENCODING  1 </span><span class="comment">/* 8 bit */</span>
    180. 

  180. <a name="l00148"></a>00148 <span class="preprocessor">#define RIME_HC1_HC_UDP_UDP_ENCODING  2 </span><span class="comment">/* 8 bit */</span>
    181. 

  181. <a name="l00149"></a>00149 <span class="preprocessor">#define RIME_HC1_HC_UDP_TTL           3 </span><span class="comment">/* 8 bit */</span>
    182. 

  182. <a name="l00150"></a>00150 <span class="preprocessor">#define RIME_HC1_HC_UDP_PORTS         4 </span><span class="comment">/* 8 bit */</span>
    183. 

  183. <a name="l00151"></a>00151 <span class="preprocessor">#define RIME_HC1_HC_UDP_CHKSUM        5 </span><span class="comment">/* 16 bit */</span>
    184. 

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

  185. <a name="l00153"></a>00153 <span class="comment">/** \name Pointers in the sicslowpan and uip buffer</span>
    186. 

  186. <a name="l00154"></a>00154 <span class="comment"> *  @{</span>
    187. 

  187. <a name="l00155"></a>00155 <span class="comment"> */</span>
    188. 

  188. <a name="l00156"></a>00156 <span class="preprocessor">#define SICSLOWPAN_IP_BUF   ((struct uip_ip_hdr *)&amp;sicslowpan_buf[UIP_LLH_LEN])</span>
    189. 

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

  190. <a name="l00158"></a>00158 <span class="preprocessor"></span>
    191. 

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

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

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

  194. <a name="l00162"></a>00162 <span class="preprocessor"></span><span class="comment">/** @} */</span>
    195. 

  195. <a name="l00163"></a>00163 
    196. 

  196. <a name="l00164"></a>00164 <span class="comment"></span>
    197. 

  197. <a name="l00165"></a>00165 <span class="comment">/** \brief Size of the 802.15.4 payload (127byte - 25 for MAC header) */</span>
    198. 

  198. <a name="l00166"></a><a class="code" href="a01680.html#gaf213c8c71222bb86256fb3e37582242b">00166</a> <span class="preprocessor">#define MAC_MAX_PAYLOAD 102</span>
    199. 

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

  200. <a name="l00168"></a>00168 <span class="comment">/** \name General 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">/** A pointer to the mac driver */</span>
    204. 

  204. <a name="l00172"></a><a class="code" href="a01680.html#ga1a8a1d348eacac5dcc3f01879e94a61d">00172</a> <span class="keyword">const</span> <span class="keyword">struct </span><a class="code" href="a00055.html" title="The structure of a MAC protocol driver in Contiki.">mac_driver</a> *<a class="code" href="a01680.html#ga1a8a1d348eacac5dcc3f01879e94a61d" title="A pointer to the mac driver.">sicslowpan_mac</a>;
    205. 

  205. <a name="l00173"></a>00173 
    206. 

  206. <a name="l00174"></a>00174 <span class="preprocessor">#ifdef SICSLOWPAN_NH_COMPRESSOR</span>
    207. 

  207. <a name="l00175"></a>00175 <span class="preprocessor"></span><span class="comment">/** A pointer to the additional compressor */</span>
    208. 

  208. <a name="l00176"></a>00176 <span class="keyword">extern</span> <span class="keyword">struct </span><a class="code" href="a00080.html" title="The structure of a next header compressor.">sicslowpan_nh_compressor</a> SICSLOWPAN_NH_COMPRESSOR;
    209. 

  209. <a name="l00177"></a>00177 <span class="preprocessor">#endif</span>
    210. 

  210. <a name="l00178"></a>00178 <span class="preprocessor"></span><span class="comment"></span>
    211. 

  211. <a name="l00179"></a>00179 <span class="comment">/**</span>
    212. 

  212. <a name="l00180"></a>00180 <span class="comment"> * A pointer to the rime buffer.</span>
    213. 

  213. <a name="l00181"></a>00181 <span class="comment"> * We initialize it to the beginning of the rime buffer, then</span>
    214. 

  214. <a name="l00182"></a>00182 <span class="comment"> * access different fields by updating the offset rime_hdr_len.</span>
    215. 

  215. <a name="l00183"></a>00183 <span class="comment"> */</span>
    216. 

  216. <a name="l00184"></a>00184 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> *rime_ptr;
    217. 

  217. <a name="l00185"></a>00185 <span class="comment"></span>
    218. 

  218. <a name="l00186"></a>00186 <span class="comment">/**</span>
    219. 

  219. <a name="l00187"></a>00187 <span class="comment"> * rime_hdr_len is the total length of (the processed) 6lowpan headers</span>
    220. 

  220. <a name="l00188"></a>00188 <span class="comment"> * (fragment headers, IPV6 or HC1, HC2, and HC1 and HC2 non compressed</span>
    221. 

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

  222. <a name="l00190"></a>00190 <span class="comment"> */</span>
    223. 

  223. <a name="l00191"></a>00191 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> rime_hdr_len;
    224. 

  224. <a name="l00192"></a>00192 <span class="comment"></span>
    225. 

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

  226. <a name="l00194"></a>00194 <span class="comment"> * The length of the payload in the Rime buffer.</span>
    227. 

  227. <a name="l00195"></a>00195 <span class="comment"> * The payload is what comes after the compressed or uncompressed</span>
    228. 

  228. <a name="l00196"></a>00196 <span class="comment"> * headers (can be the IP payload if the IP header only is compressed</span>
    229. 

  229. <a name="l00197"></a>00197 <span class="comment"> * or the UDP payload if the UDP header is also compressed)</span>
    230. 

  230. <a name="l00198"></a>00198 <span class="comment"> */</span>
    231. 

  231. <a name="l00199"></a>00199 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> rime_payload_len;
    232. 

  232. <a name="l00200"></a>00200 <span class="comment"></span>
    233. 

  233. <a name="l00201"></a>00201 <span class="comment">/**</span>
    234. 

  234. <a name="l00202"></a>00202 <span class="comment"> * uncomp_hdr_len is the length of the headers before compression (if HC2</span>
    235. 

  235. <a name="l00203"></a>00203 <span class="comment"> * is used this includes the UDP header in addition to the IP header).</span>
    236. 

  236. <a name="l00204"></a>00204 <span class="comment"> */</span>
    237. 

  237. <a name="l00205"></a>00205 <span class="keyword">static</span> <a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> uncomp_hdr_len;<span class="comment"></span>
    238. 

  238. <a name="l00206"></a>00206 <span class="comment">/** @} */</span>
    239. 

  239. <a name="l00207"></a>00207 
    240. 

  240. <a name="l00208"></a>00208 <span class="preprocessor">#if SICSLOWPAN_CONF_FRAG</span>
    241. 

  241. <a name="l00209"></a>00209 <span class="preprocessor"></span><span class="comment">/** \name Fragmentation related variables</span>
    242. 

  242. <a name="l00210"></a>00210 <span class="comment"> *  @{</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="keyword">static</span> uint16_t sicslowpan_len;
    246. 

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

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

  248. <a name="l00216"></a>00216 <span class="comment"> * The buffer used for the 6lowpan reassembly.</span>
    249. 

  249. <a name="l00217"></a>00217 <span class="comment"> * This buffer contains only the IPv6 packet (no MAC header, 6lowpan, etc).</span>
    250. 

  250. <a name="l00218"></a>00218 <span class="comment"> * It has a fix size as we do not use dynamic memory allocation.</span>
    251. 

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

  252. <a name="l00220"></a>00220 <span class="keyword">static</span> <a class="code" href="a00091.html" title="The uIP packet buffer.">uip_buf_t</a> sicslowpan_aligned_buf;
    253. 

  253. <a name="l00221"></a>00221 <span class="preprocessor">#define sicslowpan_buf (sicslowpan_aligned_buf.u8)</span>
    254. 

  254. <a name="l00222"></a>00222 <span class="preprocessor"></span><span class="comment"></span>
    255. 

  255. <a name="l00223"></a>00223 <span class="comment">/** The total length of the IPv6 packet in the sicslowpan_buf. */</span>
    256. 

  256. <a name="l00224"></a>00224 <span class="comment"></span>
    257. 

  257. <a name="l00225"></a>00225 <span class="comment">/**</span>
    258. 

  258. <a name="l00226"></a>00226 <span class="comment"> * length of the ip packet already sent / received.</span>
    259. 

  259. <a name="l00227"></a>00227 <span class="comment"> * It includes IP and transport headers.</span>
    260. 

  260. <a name="l00228"></a>00228 <span class="comment"> */</span>
    261. 

  261. <a name="l00229"></a>00229 <span class="keyword">static</span> uint16_t processed_ip_len;
    262. 

  262. <a name="l00230"></a>00230 <span class="comment"></span>
    263. 

  263. <a name="l00231"></a>00231 <span class="comment">/** Datagram tag to be put in the fragments I send. */</span>
    264. 

  264. <a name="l00232"></a>00232 <span class="keyword">static</span> uint16_t my_tag;
    265. 

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

  266. <a name="l00234"></a>00234 <span class="comment">/** When reassembling, the tag in the fragments being merged. */</span>
    267. 

  267. <a name="l00235"></a>00235 <span class="keyword">static</span> uint16_t reass_tag;
    268. 

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

  269. <a name="l00237"></a>00237 <span class="comment">/** When reassembling, the source address of the fragments being merged */</span>
    270. 

  270. <a name="l00238"></a>00238 rimeaddr_t frag_sender;
    271. 

  271. <a name="l00239"></a>00239 <span class="comment"></span>
    272. 

  272. <a name="l00240"></a>00240 <span class="comment">/** Reassembly %process %timer. */</span>
    273. 

  273. <a name="l00241"></a>00241 <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="a00086.html" title="A timer.">timer</a> reass_timer;
    274. 

  274. <a name="l00242"></a>00242 <span class="comment"></span>
    275. 

  275. <a name="l00243"></a>00243 <span class="comment">/** @} */</span>
    276. 

  276. <a name="l00244"></a>00244 <span class="preprocessor">#else </span><span class="comment">/* SICSLOWPAN_CONF_FRAG */</span>
    277. 

  277. <a name="l00245"></a>00245 <span class="comment">/** The buffer used for the 6lowpan processing is uip_buf.</span>
    278. 

  278. <a name="l00246"></a>00246 <span class="comment">    We do not use any additional buffer.*/</span>
    279. 

  279. <a name="l00247"></a><a class="code" href="a01680.html#ga2c312c370c91d9cc20fc0c97fd430fab">00247</a> <span class="preprocessor">#define sicslowpan_buf uip_buf</span>
    280. 

  280. <a name="l00248"></a>00248 <span class="preprocessor"></span><span class="preprocessor">#define sicslowpan_len uip_len</span>
    281. 

  281. <a name="l00249"></a>00249 <span class="preprocessor"></span><span class="preprocessor">#endif </span><span class="comment">/* SICSLOWPAN_CONF_FRAG */</span>
    282. 

  282. <a name="l00250"></a>00250 
    283. 

  283. <a name="l00251"></a>00251 <span class="preprocessor">#if SICSLOWPAN_COMPRESSION == SICSLOWPAN_COMPRESSION_HC06</span>
    284. 

  284. <a name="l00252"></a>00252 <span class="preprocessor"></span><span class="comment">/** \name HC06 specific variables</span>
    285. 

  285. <a name="l00253"></a>00253 <span class="comment"> *  @{</span>
    286. 

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

  287. <a name="l00255"></a>00255 <span class="comment"></span>
    288. 

  288. <a name="l00256"></a>00256 <span class="comment">/** Addresses contexts for IPHC. */</span>
    289. 

  289. <a name="l00257"></a>00257 <span class="preprocessor">#if SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS &gt; 0</span>
    290. 

  290. <a name="l00258"></a>00258 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="a00079.html" title="The header for fragments.">sicslowpan_addr_context</a> 
    291. 

  291. <a name="l00259"></a>00259 addr_contexts[<a class="code" href="a01588.html#ga02ead2bfabed920502fe48c0baa0ed3f" title="If we use IPHC compression, how many address contexts do we support.">SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS</a>];
    292. 

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

  293. <a name="l00261"></a>00261 <span class="preprocessor"></span><span class="comment"></span>
    294. 

  294. <a name="l00262"></a>00262 <span class="comment">/** pointer to an address context. */</span>
    295. 

  295. <a name="l00263"></a>00263 <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="a00079.html" title="The header for fragments.">sicslowpan_addr_context</a> *context;
    296. 

  296. <a name="l00264"></a>00264 <span class="comment"></span>
    297. 

  297. <a name="l00265"></a>00265 <span class="comment">/** pointer to the byte where to write next inline field. */</span>
    298. 

  298. <a name="l00266"></a>00266 <span class="keyword">static</span> uint8_t *hc06_ptr;
    299. 

  299. <a name="l00267"></a>00267 
    300. 

  300. <a name="l00268"></a>00268 <span class="comment">/* Uncompression of linklocal */</span>
    301. 

  301. <a name="l00269"></a>00269 <span class="comment">/*   0 -&gt; 16 bytes from packet  */</span>
    302. 

  302. <a name="l00270"></a>00270 <span class="comment">/*   1 -&gt; 2 bytes from prefix - bunch of zeroes and 8 from packet */</span>
    303. 

  303. <a name="l00271"></a>00271 <span class="comment">/*   2 -&gt; 2 bytes from prefix - 0000::00ff:fe00:XXXX from packet */</span>
    304. 

  304. <a name="l00272"></a>00272 <span class="comment">/*   3 -&gt; 2 bytes from prefix - infer 8 bytes from lladdr */</span>
    305. 

  305. <a name="l00273"></a>00273 <span class="comment">/*   NOTE: =&gt; the uncompress function does change 0xf to 0x10 */</span>
    306. 

  306. <a name="l00274"></a>00274 <span class="comment">/*   NOTE: 0x00 =&gt; no-autoconfig =&gt; unspecified */</span>
    307. 

  307. <a name="l00275"></a>00275 <span class="keyword">const</span> uint8_t unc_llconf[] = {0x0f,0x28,0x22,0x20};
    308. 

  308. <a name="l00276"></a>00276 
    309. 

  309. <a name="l00277"></a>00277 <span class="comment">/* Uncompression of ctx-based */</span>
    310. 

  310. <a name="l00278"></a>00278 <span class="comment">/*   0 -&gt; 0 bits from packet [unspecified / reserved] */</span>
    311. 

  311. <a name="l00279"></a>00279 <span class="comment">/*   1 -&gt; 8 bytes from prefix - bunch of zeroes and 8 from packet */</span>
    312. 

  312. <a name="l00280"></a>00280 <span class="comment">/*   2 -&gt; 8 bytes from prefix - 0000::00ff:fe00:XXXX + 2 from packet */</span>
    313. 

  313. <a name="l00281"></a>00281 <span class="comment">/*   3 -&gt; 8 bytes from prefix - infer 8 bytes from lladdr */</span>
    314. 

  314. <a name="l00282"></a>00282 <span class="keyword">const</span> uint8_t unc_ctxconf[] = {0x00,0x88,0x82,0x80};
    315. 

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

  316. <a name="l00284"></a>00284 <span class="comment">/* Uncompression of ctx-based */</span>
    317. 

  317. <a name="l00285"></a>00285 <span class="comment">/*   0 -&gt; 0 bits from packet  */</span>
    318. 

  318. <a name="l00286"></a>00286 <span class="comment">/*   1 -&gt; 2 bytes from prefix - bunch of zeroes 5 from packet */</span>
    319. 

  319. <a name="l00287"></a>00287 <span class="comment">/*   2 -&gt; 2 bytes from prefix - zeroes + 3 from packet */</span>
    320. 

  320. <a name="l00288"></a>00288 <span class="comment">/*   3 -&gt; 2 bytes from prefix - infer 1 bytes from lladdr */</span>
    321. 

  321. <a name="l00289"></a>00289 <span class="keyword">const</span> uint8_t unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21};
    322. 

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

  323. <a name="l00291"></a>00291 <span class="comment">/* Link local prefix */</span>
    324. 

  324. <a name="l00292"></a>00292 <span class="keyword">const</span> uint8_t llprefix[] = {0xfe, 0x80};
    325. 

  325. <a name="l00293"></a>00293 
    326. 

  326. <a name="l00294"></a>00294 <span class="comment">/* TTL uncompression values */</span>
    327. 

  327. <a name="l00295"></a>00295 <span class="keyword">static</span> <span class="keyword">const</span> uint8_t ttl_values[] = {0, 1, 64, 255};
    328. 

  328. <a name="l00296"></a>00296 
    329. 

  329. <a name="l00297"></a>00297 <span class="comment">/*--------------------------------------------------------------------*/</span><span class="comment"></span>
    330. 

  330. <a name="l00298"></a>00298 <span class="comment">/** \name HC06 related functions</span>
    331. 

  331. <a name="l00299"></a>00299 <span class="comment"> * @{                                                                 */</span>
    332. 

  332. <a name="l00300"></a>00300 <span class="comment">/*--------------------------------------------------------------------*/</span><span class="comment"></span>
    333. 

  333. <a name="l00301"></a>00301 <span class="comment">/** \brief find the context corresponding to prefix ipaddr */</span>
    334. 

  334. <a name="l00302"></a>00302 <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="a00079.html" title="The header for fragments.">sicslowpan_addr_context</a>*
    335. 

  335. <a name="l00303"></a>00303 addr_context_lookup_by_prefix(<a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> *ipaddr)
    336. 

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

  337. <a name="l00305"></a>00305 <span class="comment">/* Remove code to avoid warnings and save flash if no context is used */</span>
    338. 

  338. <a name="l00306"></a>00306 <span class="preprocessor">#if SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS &gt; 0</span>
    339. 

  339. <a name="l00307"></a>00307 <span class="preprocessor"></span>  <span class="keywordtype">int</span> i;
    340. 

  340. <a name="l00308"></a>00308   <span class="keywordflow">for</span>(i = 0; i &lt; <a class="code" href="a01588.html#ga02ead2bfabed920502fe48c0baa0ed3f" title="If we use IPHC compression, how many address contexts do we support.">SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS</a>; i++) {
    341. 

  341. <a name="l00309"></a>00309     <span class="keywordflow">if</span>((addr_contexts[i].used == 1) &amp;&amp;
    342. 

  342. <a name="l00310"></a>00310        uip_ipaddr_prefixcmp(&amp;addr_contexts[i].prefix, ipaddr, 64)) {
    343. 

  343. <a name="l00311"></a>00311       <span class="keywordflow">return</span> &amp;addr_contexts[i];
    344. 

  344. <a name="l00312"></a>00312     }
    345. 

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

  346. <a name="l00314"></a>00314 <span class="preprocessor">#endif </span><span class="comment">/* SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS &gt; 0 */</span>
    347. 

  347. <a name="l00315"></a>00315   <span class="keywordflow">return</span> NULL;
    348. 

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

  349. <a name="l00317"></a>00317 <span class="comment">/*--------------------------------------------------------------------*/</span><span class="comment"></span>
    350. 

  350. <a name="l00318"></a>00318 <span class="comment">/** \brief find the context with the given number */</span>
    351. 

  351. <a name="l00319"></a>00319 <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="a00079.html" title="The header for fragments.">sicslowpan_addr_context</a>*
    352. 

  352. <a name="l00320"></a>00320 addr_context_lookup_by_number(<a class="code" href="a01668.html#ga4caecabca98b43919dd11be1c0d4cd8e" title="The 8-bit unsigned data type.">u8_t</a> number)
    353. 

  353. <a name="l00321"></a>00321 {
    354. 

  354. <a name="l00322"></a>00322 <span class="comment">/* Remove code to avoid warnings and save flash if no context is used */</span> 
    355. 

  355. <a name="l00323"></a>00323 <span class="preprocessor">#if SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS &gt; 0</span>
    356. 

  356. <a name="l00324"></a>00324 <span class="preprocessor"></span>  <span class="keywordtype">int</span> i;
    357. 

  357. <a name="l00325"></a>00325   <span class="keywordflow">for</span>(i = 0; i &lt; SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS; i++) {
    358. 

  358. <a name="l00326"></a>00326     <span class="keywordflow">if</span>((addr_contexts[i].used == 1) &amp;&amp;
    359. 

  359. <a name="l00327"></a>00327        addr_contexts[i].number == number) {
    360. 

  360. <a name="l00328"></a>00328       <span class="keywordflow">return</span> &amp;addr_contexts[i];
    361. 

  361. <a name="l00329"></a>00329     }
    362. 

  362. <a name="l00330"></a>00330   }
    363. 

  363. <a name="l00331"></a>00331 <span class="preprocessor">#endif </span><span class="comment">/* SICSLOWPAN_CONF_MAX_ADDR_CONTEXTS &gt; 0 */</span>
    364. 

  364. <a name="l00332"></a>00332   <span class="keywordflow">return</span> NULL;
    365. 

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

  366. <a name="l00334"></a>00334 <span class="comment">/*--------------------------------------------------------------------*/</span>
    367. 

  367. <a name="l00335"></a>00335 <span class="keyword">static</span> uint8_t
    368. 

  368. <a name="l00336"></a>00336 compress_addr_64(uint8_t bitpos, <a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> *ipaddr, <a class="code" href="a00102.html" title="802.3 address">uip_lladdr_t</a> *lladdr)
    369. 

  369. <a name="l00337"></a>00337 {
    370. 

  370. <a name="l00338"></a>00338   <span class="keywordflow">if</span>(uip_is_addr_mac_addr_based(ipaddr, lladdr)) {
    371. 

  371. <a name="l00339"></a>00339     <span class="keywordflow">return</span> 3 &lt;&lt; bitpos; <span class="comment">/* 0-bits */</span>
    372. 

  372. <a name="l00340"></a>00340   } <span class="keywordflow">else</span> <span class="keywordflow">if</span>(<a class="code" href="a01680.html#ga8296cf462962152c3baf7765baf086c8" title="check whether we can compress the IID in address &amp;#39;a&amp;#39; to 16 bits.">sicslowpan_is_iid_16_bit_compressable</a>(ipaddr)) {
    373. 

  373. <a name="l00341"></a>00341     <span class="comment">/* compress IID to 16 bits xxxx::0000:00ff:fe00:XXXX */</span>
    374. 

  374. <a name="l00342"></a>00342     memcpy(hc06_ptr, &amp;ipaddr-&gt;u16[7], 2);
    375. 

  375. <a name="l00343"></a>00343     hc06_ptr += 2;
    376. 

  376. <a name="l00344"></a>00344     <span class="keywordflow">return</span> 2 &lt;&lt; bitpos; <span class="comment">/* 16-bits */</span>
    377. 

  377. <a name="l00345"></a>00345   } <span class="keywordflow">else</span> {
    378. 

  378. <a name="l00346"></a>00346     <span class="comment">/* do not compress IID =&gt; xxxx::IID */</span>
    379. 

  379. <a name="l00347"></a>00347     memcpy(hc06_ptr, &amp;ipaddr-&gt;u16[4], 8);
    380. 

  380. <a name="l00348"></a>00348     hc06_ptr += 8;
    381. 

  381. <a name="l00349"></a>00349     <span class="keywordflow">return</span> 1 &lt;&lt; bitpos; <span class="comment">/* 64-bits */</span>
    382. 

  382. <a name="l00350"></a>00350   }
    383. 

  383. <a name="l00351"></a>00351 }
    384. 

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

  385. <a name="l00353"></a>00353 <span class="comment">/*-------------------------------------------------------------------- */</span>
    386. 

  386. <a name="l00354"></a>00354 <span class="comment">/* Uncompress addresses based on a prefix and a postfix with zeroes in</span>
    387. 

  387. <a name="l00355"></a>00355 <span class="comment"> * between. If the postfix is zero in length it will use the link address</span>
    388. 

  388. <a name="l00356"></a>00356 <span class="comment"> * to configure the IP address (autoconf style).</span>
    389. 

  389. <a name="l00357"></a>00357 <span class="comment"> * pref_post_count takes a byte where the first nibble specify prefix count</span>
    390. 

  390. <a name="l00358"></a>00358 <span class="comment"> * and the second postfix count (NOTE: 15/0xf =&gt; 16 bytes copy).</span>
    391. 

  391. <a name="l00359"></a>00359 <span class="comment"> */</span>
    392. 

  392. <a name="l00360"></a>00360 <span class="keyword">static</span> <span class="keywordtype">void</span>
    393. 

  393. <a name="l00361"></a>00361 uncompress_addr(<a class="code" href="a00106.html" title="Representation of an IP address.">uip_ipaddr_t</a> *ipaddr, uint8_t <span class="keyword">const</span> prefix[],
    394. 

  394. <a name="l00362"></a>00362                 uint8_t pref_post_count, <a class="code" href="a00102.html" title="802.3 address">uip_lladdr_t</a> *lladdr)
    395. 

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

  396. <a name="l00364"></a>00364   uint8_t prefcount = pref_post_count &gt;&gt; 4;
    397. 

  397. <a name="l00365"></a>00365   uint8_t postcount = pref_post_count &amp; 0x0f;
    398. 

  398. <a name="l00366"></a>00366   <span class="comment">/* full nibble 15 =&gt; 16 */</span>
    399. 

  399. <a name="l00367"></a>00367   prefcount = prefcount == 15 ? 16 : prefcount;
    400. 

  400. <a name="l00368"></a>00368   postcount = postcount == 15 ? 16 : postcount;
    401. 

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

  402. <a name="l00370"></a>00370   PRINTF(<span class="stringliteral">&quot;Uncompressing %d + %d =&gt; &quot;</span>, prefcount, postcount);
    403. 

  403. <a name="l00371"></a>00371 
    404. 

  404. <a name="l00372"></a>00372   <span class="keywordflow">if</span>(prefcount &gt; 0) {
    405. 

  405. <a name="l00373"></a>00373     memcpy(ipaddr, prefix, prefcount);
    406. 

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

  407. <a name="l00375"></a>00375   <span class="keywordflow">if</span>(prefcount + postcount &lt; 16) {
    408. 

  408. <a name="l00376"></a>00376     memset(&amp;ipaddr-&gt;u8[prefcount], 0, 16 - (prefcount + postcount));
    409. 

  409. <a name="l00377"></a>00377   }
    410. 

  410. <a name="l00378"></a>00378   <span class="keywordflow">if</span>(postcount &gt; 0) {
    411. 

  411. <a name="l00379"></a>00379     memcpy(&amp;ipaddr-&gt;u8[16 - postcount], hc06_ptr, postcount);
    412. 

  412. <a name="l00380"></a>00380     <span class="keywordflow">if</span>(postcount == 2 &amp;&amp; prefcount &lt; 11) {
    413. 

  413. <a name="l00381"></a>00381       <span class="comment">/* 16 bits uncompression =&gt; 0000:00ff:fe00:XXXX */</span>
    414. 

  414. <a name="l00382"></a>00382       ipaddr-&gt;u8[11] = 0xff;
    415. 

  415. <a name="l00383"></a>00383       ipaddr-&gt;u8[12] = 0xfe;
    416. 

  416. <a name="l00384"></a>00384     }
    417. 

  417. <a name="l00385"></a>00385     hc06_ptr += postcount;
    418. 

  418. <a name="l00386"></a>00386   } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (prefcount &gt; 0) {
    419. 

  419. <a name="l00387"></a>00387     <span class="comment">/* no IID based configuration if no prefix and no data =&gt; unspec */</span>
    420. 

  420. <a name="l00388"></a>00388     <a class="code" href="a01685.html#gabbe961bbeaea80289fddf448a542fea9" title="set the last 64 bits of an IP address based on the MAC address">uip_ds6_set_addr_iid</a>(ipaddr, lladdr);
    421. 

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

  422. <a name="l00390"></a>00390 
    423. 

  423. <a name="l00391"></a>00391   PRINT6ADDR(ipaddr);
    424. 

  424. <a name="l00392"></a>00392   PRINTF(<span class="stringliteral">&quot;\n&quot;</span>);
    425. 

  425. <a name="l00393"></a>00393 }
    426. 

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

  427. <a name="l00395"></a>00395 <span class="comment">/*--------------------------------------------------------------------*/</span><span class="comment"></span>
    428. 

  428. <a name="l00396"></a>00396 <span class="comment">/**</span>
    429. 

  429. <a name="l00397"></a>00397 <span class="comment"> * \brief Compress IP/UDP header</span>
    430. 

  430. <a name="l00398"></a>00398 <span class="comment"> *</span>
    431. 

  431. <a name="l00399"></a>00399 <span class="comment"> * This function is called by the 6lowpan code to create a compressed</span>
    432. 

  432. <a name="l00400"></a>00400 <span class="comment"> * 6lowpan packet in the packetbuf buffer from a full IPv6 packet in the</span>
    433. 

  433. <a name="l00401"></a>00401 <span class="comment"> * uip_buf buffer.</span>
    434. 

  434. <a name="l00402"></a>00402 <span class="comment"> *</span>
    435. 

  435. <a name="l00403"></a>00403 <span class="comment"> *</span>
    436. 

  436. <a name="l00404"></a>00404 <span class="comment"> * HC-06 (draft-ietf-6lowpan-hc, version 6)\n</span>
    437. 

  437. <a name="l00405"></a>00405 <span class="comment"> * http://tools.ietf.org/html/draft-ietf-6lowpan-hc-06</span>
    438. 

  438. <a name="l00406"></a>00406 <span class="comment"> *</span>
    439. 

  439. <a name="l00407"></a>00407 <span class="comment"> * \note We do not support ISA100_UDP header compression</span>
    440. 

  440. <a name="l00408"></a>00408 <span class="comment"> *</span>
    441. 

  441. <a name="l00409"></a>00409 <span class="comment"> * For LOWPAN_UDP compression, we either compress both ports or none.</span>
    442. 

  442. <a name="l00410"></a>00410 <span class="comment"> * General format with LOWPAN_UDP compression is</span>
    443. 

  443. <a name="l00411"></a>00411 <span class="comment"> * \verbatim</span>
    444. 

  444. <a name="l00412"></a>00412 <span class="comment"> *                      1                   2                   3</span>
    445. 

  445. <a name="l00413"></a>00413 <span class="comment"> *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1</span>
    446. 

  446. <a name="l00414"></a>00414 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
    447. 

  447. <a name="l00415"></a>00415 <span class="comment"> * |0|1|1|TF |N|HLI|C|S|SAM|M|D|DAM| SCI   | DCI   | comp. IPv6 hdr|</span>
    448. 

  448. <a name="l00416"></a>00416 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
    449. 

  449. <a name="l00417"></a>00417 <span class="comment"> * | compressed IPv6 fields .....                                  |</span>
    450. 

  450. <a name="l00418"></a>00418 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
    451. 

  451. <a name="l00419"></a>00419 <span class="comment"> * | LOWPAN_UDP    | non compressed UDP fields ...                 |</span>
    452. 

  452. <a name="l00420"></a>00420 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
    453. 

  453. <a name="l00421"></a>00421 <span class="comment"> * | L4 data ...                                                   |</span>
    454. 

  454. <a name="l00422"></a>00422 <span class="comment"> * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span>
    455. 

  455. <a name="l00423"></a>00423 <span class="comment"> * \endverbatim</span>
    456. 

  456. <a name="l00424"></a>00424 <span class="comment"> * \note The context number 00 is reserved for the link local prefix.</span>
    457. 

  457. <a name="l00425"></a>00425 <span class="comment"> * For unicast addresses, if we cannot compress the prefix, we neither</span>
    458. 

  458. <a name="l00426"></a>00426 <span class="comment"> * compress the IID.</span>
    459. 

  459. <a name="l00427"></a>00427 <span class="comment"> * \param rime_destaddr L2 destination address, needed to compress IP</span>
    460. 

  460. <a name="l00428"></a>00428 <span class="comment"> * dest</span>
    461. 

  461. <a name="l00429"></a>00429 <span class="comment"> */</span>
    462. 

  462. <a name="l00430"></a>00430 <span class="keyword">static</span> <span class="keywordtype">void</span>
    463. 

  463. <a name="l00431"></a>00431 compress_hdr_hc06(rimeaddr_t *rime_destaddr)
    464. 

  464. <a name="l00432"></a>00432 {
    465. 

  465. <a name="l00433"></a>00433   uint8_t tmp, iphc0, iphc1;
    466. 

  466. <a name="l00434"></a>00434 <span class="preprocessor">#if DEBUG</span>
    467. 

  467. <a name="l00435"></a>00435 <span class="preprocessor"></span>  PRINTF(<span class="stringliteral">&quot;before compression: &quot;</span>);
    468. 

  468. <a name="l00436"></a>00436   <span class="keywordflow">for</span> (tmp = 0; tmp &lt; <a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>-&gt;len[1] + 40; tmp++) {
    469. 

  469. <a name="l00437"></a>00437     uint8_t data = ((uint8_t *) (<a class="code" href="a01685.html#gaf966537cf73ee5973da59bba6b21b731" title="Pointer to IP header.">UIP_IP_BUF</a>))[tmp];
    470. 

  470. <a name="l00438"></a>00438     PRINTF(<span class="stringliteral">&quot;%02x&quot;</span>, data);
    471. 

  471. <a name="l00439"></a>00439   }
    472. 

  472. <a name="l00440"></a>00440   PRINTF(<span class="stringliteral">&quot;\n&quot;</span>);
    473. 

  473. <a name="l00441"></a>00441 <span class="preprocessor">#endif</span>
    474. 

  474. <a name="l00442"></a>00442 <span class="preprocessor"></span>
    475. 

  475. <a name="l00443"></a>00443   hc06_ptr = rime_ptr + 2;
    476. 

  476. <a name="l00444"></a>00444   <span class="comment">/*</span>
    477. 

  477. <a name="l00445"></a>00445 <span class="comment">   * As we copy some bit-length fields, in the IPHC encoding bytes,</span>
    478. 

  478. <a name="l00446"></a>00446 <span class="comment">   * we sometimes use |=</span>
    479. 

  479. <a name="l00447"></a>00447 <span class="comment">   * If the field is 0, and the current bit value in memory is 1,</span>
    480. 

  480. <a name="l00448"></a>00448 <span class="comment">   * this does not work. We therefore reset the IPHC encoding here</span>
    481. 

  481. <a name="l00449"></a>00449 <span class="comment">   */</span>
    482. 

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

  483. <a name="l00451"></a>00451   iphc0 = SICSLOWPAN_DISPATCH_IPHC;
    484. 

  484. <a name="l00452"></a>00452   iphc1 = 0;
    485. 

  485. <a name="l00453"></a>00453   RIME_IPHC_BUF[2] = 0; <span class="comment">/* might not be used - but needs to be cleared */</span>
    486. 

  486. <a name="l00454"></a>00454 
    487. 

  487. <a name="l00455"></a>00455   <span class="comment">/*</span>
    488. 

  488. <a name="l00456"></a>00456 <span class="comment">   * Address handling needs to be made first since it might</span>
    489. 

  489. <a name="l00457"></a>00457 <span class="comment">   * cause an extra byte with [ SCI | DCI ]</span>
    490. 

  490. <a name="l00458"></a>00458 <span class="comment">   *</span>
    491. 

  491. <a name="l00459"></a>00459 <span class="comment">   */</span>
    492. 

  492. <a name="l00460"></a>00460 
    493. 

  493. <a name="l00461"></a>00461 
    494. 

  494. <a name="l00462"></a>00462   <span class="comment">/* check if dest context exists (for allocating third byte) */</span>
    495. 

  495. <a name="l00463"></a>00463   <span class="comment">/* TODO: fix this so that it remembers the looked up values for</span>
    496. 

  496. <a name="l00464"></a>00…
    497.

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