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<div class="title">inet_chksum.c</div> </div>
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<a href="inet__chksum_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>  </div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * Copyright (c) 2001-2004 Swedish Institute of Computer Science.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without modification,</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * are permitted provided that the following conditions are met:</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * this list of conditions and the following disclaimer in the documentation</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * and/or other materials provided with the distribution.</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * 3. The name of the author may not be used to endorse or promote products</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * derived from this software without specific prior written permission.</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> * This file is part of the lwIP TCP/IP stack.</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> * Author: Adam Dunkels <adam@sics.se></span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#include "<a class="code" href="opt_8h.html">net/opt.h</a>"</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  </div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#include "<a class="code" href="inet__chksum_8h.html">net/inet_chksum.h</a>"</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor">#include "<a class="code" href="def_8h.html">net/def.h</a>"</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#include "<a class="code" href="ip__addr_8h.html">net/ip_addr.h</a>"</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  </div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor">#include <<a class="code" href="string_8h.html">string.h</a>></span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  </div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#ifndef LWIP_CHKSUM</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"><a class="line" href="inet__chksum_8c.html#adaaa51e3290b80f8f8f8b1d080f54c1e"> 57</a></span> <span class="preprocessor"># define LWIP_CHKSUM lwip_standard_chksum</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor"># ifndef LWIP_CHKSUM_ALGORITHM</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"><a class="line" href="inet__chksum_8c.html#aa0865f14286191bd72fc1a9d9cbe25d4"> 59</a></span> <span class="preprocessor"># define LWIP_CHKSUM_ALGORITHM 2</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor"># endif</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="inet__chksum_8c.html#a4c8d40559878aa9bf6bfce8d8ab8a72b">lwip_standard_chksum</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *dataptr, <span class="keywordtype">int</span> len);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">/* If none set: */</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#ifndef LWIP_CHKSUM_ALGORITHM</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor"># define LWIP_CHKSUM_ALGORITHM 0</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  </div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="preprocessor">#if (LWIP_CHKSUM_ALGORITHM == 1) </span><span class="comment">/* Version #1 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  </div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <a class="code" href="inet__chksum_8c.html#a4c8d40559878aa9bf6bfce8d8ab8a72b">lwip_standard_chksum</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *dataptr, <span class="keywordtype">int</span> len)</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> {</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> acc;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> src;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *octetptr;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  </div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  acc = 0;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">/* dataptr may be at odd or even addresses */</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  octetptr = (<span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>*)dataptr;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">while</span> (len > 1) {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">/* declare first octet as most significant</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"> thus assume network order, ignoring host order */</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  src = (*octetptr) << 8;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  octetptr++;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">/* declare second octet as least significant */</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  src |= (*octetptr);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  octetptr++;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  acc += src;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  len -= 2;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  }</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">if</span> (len > 0) {</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">/* accumulate remaining octet */</span></div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  src = (*octetptr) << 8;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  acc += src;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  }</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">/* add deferred carry bits */</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  acc = (acc >> 16) + (acc & 0x0000ffffUL);</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">if</span> ((acc & 0xffff0000UL) != 0) {</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  acc = (acc >> 16) + (acc & 0x0000ffffUL);</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  }</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="comment">/* This maybe a little confusing: reorder sum using lwip_htons()</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> instead of lwip_ntohs() since it has a little less call overhead.</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> <span class="comment"> The caller must invert bits for Internet sum ! */</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">return</span> <a class="code" href="def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>((<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)acc);</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> }</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="preprocessor">#if (LWIP_CHKSUM_ALGORITHM == 2) </span><span class="comment">/* Alternative version #2 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * Curt McDowell</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> * Broadcom Corp.</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> * csm@broadcom.com</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * IP checksum two bytes at a time with support for</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> * unaligned buffer.</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> * Works for len up to and including 0x20000.</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"> * by Curt McDowell, Broadcom Corp. 12/08/2005</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"> * @param dataptr points to start of data to be summed at any boundary</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> * @param len length of data to be summed</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> * @return host order (!) lwip checksum (non-inverted Internet sum)</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00133"></a><span class="lineno"><a class="line" href="inet__chksum_8c.html#a4c8d40559878aa9bf6bfce8d8ab8a72b"> 133</a></span> <a class="code" href="inet__chksum_8c.html#a4c8d40559878aa9bf6bfce8d8ab8a72b">lwip_standard_chksum</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *dataptr, <span class="keywordtype">int</span> len)</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> {</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *pb = (<span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)dataptr;</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> *ps;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> t = 0;</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> sum = 0;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordtype">int</span> odd = ((<a class="code" href="group__compiler__abstraction.html#gaf019cbb71af10dcfda7758b21e655307">mem_ptr_t</a>)pb & 1);</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  </div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="comment">/* Get aligned to u16_t */</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">if</span> (odd && len > 0) {</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  ((<a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)&t)[1] = *pb++;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  len--;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  }</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  </div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="comment">/* Add the bulk of the data */</span></div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  ps = (<span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> *)(<span class="keyword">const</span> <span class="keywordtype">void</span> *)pb;</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">while</span> (len > 1) {</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  sum += *ps++;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  len -= 2;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  }</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  </div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="comment">/* Consume left-over byte, if any */</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keywordflow">if</span> (len > 0) {</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  ((<a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)&t)[0] = *(<span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)ps;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  }</div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  </div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">/* Add end bytes */</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  sum += t;</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  </div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="comment">/* Fold 32-bit sum to 16 bits</span></div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> calling this twice is probably faster than if statements... */</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  sum = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(sum);</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  sum = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(sum);</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  </div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="comment">/* Swap if alignment was odd */</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordflow">if</span> (odd) {</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  sum = <a class="code" href="inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(sum);</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  }</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  </div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">return</span> (<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)sum;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> }</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  </div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="preprocessor">#if (LWIP_CHKSUM_ALGORITHM == 3) </span><span class="comment">/* Alternative version #3 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  </div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span> <a class="code" href="inet__chksum_8c.html#a4c8d40559878aa9bf6bfce8d8ab8a72b">lwip_standard_chksum</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *dataptr, <span class="keywordtype">int</span> len)</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> {</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *pb = (<span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)dataptr;</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> *ps;</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> t = 0;</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> *pl;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> sum = 0, tmp;</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="comment">/* starts at odd byte address? */</span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordtype">int</span> odd = ((<a class="code" href="group__compiler__abstraction.html#gaf019cbb71af10dcfda7758b21e655307">mem_ptr_t</a>)pb & 1);</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  </div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="keywordflow">if</span> (odd && len > 0) {</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  ((<a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)&t)[1] = *pb++;</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  len--;</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  }</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  </div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  ps = (<span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> *)(<span class="keyword">const</span> <span class="keywordtype">void</span>*)pb;</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  </div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">if</span> (((<a class="code" href="group__compiler__abstraction.html#gaf019cbb71af10dcfda7758b21e655307">mem_ptr_t</a>)ps & 3) && len > 1) {</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  sum += *ps++;</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  len -= 2;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  }</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  </div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  pl = (<span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> *)(<span class="keyword">const</span> <span class="keywordtype">void</span>*)ps;</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  </div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="keywordflow">while</span> (len > 7) {</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  tmp = sum + *pl++; <span class="comment">/* ping */</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keywordflow">if</span> (tmp < sum) {</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  tmp++; <span class="comment">/* add back carry */</span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  }</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  </div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  sum = tmp + *pl++; <span class="comment">/* pong */</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordflow">if</span> (sum < tmp) {</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  sum++; <span class="comment">/* add back carry */</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  }</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  </div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  len -= 8;</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  }</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  </div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="comment">/* make room in upper bits */</span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  sum = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(sum);</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  </div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  ps = (<span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> *)pl;</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  </div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <span class="comment">/* 16-bit aligned word remaining? */</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="keywordflow">while</span> (len > 1) {</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  sum += *ps++;</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  len -= 2;</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  }</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  </div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="comment">/* dangling tail byte remaining? */</span></div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keywordflow">if</span> (len > 0) { <span class="comment">/* include odd byte */</span></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  ((<a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)&t)[0] = *(<span class="keyword">const</span> <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)ps;</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  }</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  </div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  sum += t; <span class="comment">/* add end bytes */</span></div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  </div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="comment">/* Fold 32-bit sum to 16 bits</span></div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> <span class="comment"> calling this twice is probably faster than if statements... */</span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  sum = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(sum);</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  sum = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(sum);</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  </div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keywordflow">if</span> (odd) {</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  sum = <a class="code" href="inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(sum);</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  }</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  </div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <span class="keywordflow">return</span> (<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)sum;</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> }</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  </div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="keyword">static</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> inet_cksum_pseudo_base(<span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> proto_len, <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> acc)</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> {</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <span class="keyword">struct </span><a class="code" href="structpbuf.html">pbuf</a> *q;</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> swapped = 0;</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  </div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="comment">/* iterate through all pbuf in chain */</span></div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  <span class="keywordflow">for</span> (q = p; q != <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; q = q-><a class="code" href="structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>) {</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  <a class="code" href="debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="lwipopts_8h.html#a78140cbe70258a65cb5c9e381843e4f3">INET_DEBUG</a>, (<span class="stringliteral">"inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n"</span>,</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  (<span class="keywordtype">void</span> *)q, (<span class="keywordtype">void</span> *)q->next));</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  acc += <a class="code" href="inet__chksum_8c.html#adaaa51e3290b80f8f8f8b1d080f54c1e">LWIP_CHKSUM</a>(q->payload, q->len);</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="comment">/*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%"X32_F" \n", acc));*/</span></div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="comment">/* just executing this next line is probably faster that the if statement needed</span></div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span> <span class="comment"> to check whether we really need to execute it, and does no harm */</span></div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">if</span> (q->len % 2 != 0) {</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  swapped = 1 - swapped;</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  acc = <a class="code" href="inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(acc);</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  }</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="comment">/*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): wrapped lwip_chksum()=%"X32_F" \n", acc));*/</span></div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  }</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  </div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  <span class="keywordflow">if</span> (swapped) {</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  acc = <a class="code" href="inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(acc);</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  }</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  </div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  acc += (<a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a>)<a class="code" href="def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>((<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)proto);</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  acc += (<a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a>)<a class="code" href="def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(proto_len);</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  </div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="comment">/* Fold 32-bit sum to 16 bits</span></div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span> <span class="comment"> calling this twice is probably faster than if statements... */</span></div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <a class="code" href="debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="lwipopts_8h.html#a78140cbe70258a65cb5c9e381843e4f3">INET_DEBUG</a>, (<span class="stringliteral">"inet_chksum_pseudo(): pbuf chain lwip_chksum()=%"</span><a class="code" href="group__compiler__abstraction.html#gac219830a93d05c5f18f64ce87a34be14">X32_F</a><span class="stringliteral">"\n"</span>, acc));</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="keywordflow">return</span> (<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)~(acc & 0xffffUL);</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> }</div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  </div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> <span class="preprocessor">#if LWIP_IPV4</span></div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> <span class="comment">/* inet_chksum_pseudo:</span></div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="comment"> * Calculates the IPv4 pseudo Internet checksum used by TCP and UDP for a pbuf chain.</span></div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> <span class="comment"> * IP addresses are expected to be in network byte order.</span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span> <span class="comment"> * @param p chain of pbufs over that a checksum should be calculated (ip data part)</span></div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span> <span class="comment"> * @param src source ip address (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span> <span class="comment"> * @param dst destination ip address (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span> <span class="comment"> * @param proto ip protocol (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> <span class="comment"> * @param proto_len length of the ip data part (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> <span class="comment"> * @return checksum (as u16_t) to be saved directly in the protocol header</span></div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> inet_chksum_pseudo(<span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> proto_len,</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keyword">const</span> ip4_addr_t *src, <span class="keyword">const</span> ip4_addr_t *dest)</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> {</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> acc;</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> addr;</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  </div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  addr = ip4_addr_get_u32(src);</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  acc = (addr & 0xffffUL);</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  acc += ((addr >> 16) & 0xffffUL);</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  addr = ip4_addr_get_u32(dest);</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  acc += (addr & 0xffffUL);</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  acc += ((addr >> 16) & 0xffffUL);</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  <span class="comment">/* fold down to 16 bits */</span></div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  </div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <span class="keywordflow">return</span> inet_cksum_pseudo_base(p, proto, proto_len, acc);</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span> }</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV4 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  </div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="preprocessor">#if LWIP_IPV6</span></div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  </div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span> ip6_chksum_pseudo(<span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> proto_len,</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="keyword">const</span> ip6_addr_t *src, <span class="keyword">const</span> ip6_addr_t *dest)</div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span> {</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> acc = 0;</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> addr;</div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> addr_part;</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  </div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  <span class="keywordflow">for</span> (addr_part = 0; addr_part < 4; addr_part++) {</div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  addr = src->addr[addr_part];</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  acc += (addr & 0xffffUL);</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  acc += ((addr >> 16) & 0xffffUL);</div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  addr = dest->addr[addr_part];</div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  acc += (addr & 0xffffUL);</div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  acc += ((addr >> 16) & 0xffffUL);</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  }</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="comment">/* fold down to 16 bits */</span></div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  </div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="keywordflow">return</span> inet_cksum_pseudo_base(p, proto, proto_len, acc);</div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span> }</div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV6 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  </div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span> <span class="comment">/* ip_chksum_pseudo:</span></div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span> <span class="comment"> * Calculates the IPv4 or IPv6 pseudo Internet checksum used by TCP and UDP for a pbuf chain.</span></div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span> <span class="comment"> * IP addresses are expected to be in network byte order.</span></div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span> <span class="comment"> * @param p chain of pbufs over that a checksum should be calculated (ip data part)</span></div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span> <span class="comment"> * @param src source ip address (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span> <span class="comment"> * @param dst destination ip address (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span> <span class="comment"> * @param proto ip protocol (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span> <span class="comment"> * @param proto_len length of the ip data part (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span> <span class="comment"> * @return checksum (as u16_t) to be saved directly in the protocol header</span></div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00379"></a><span class="lineno"><a class="line" href="inet__chksum_8c.html#aa13cda42e7c262f5dee243ff6c28422f"> 379</a></span> <a class="code" href="inet__chksum_8c.html#aa13cda42e7c262f5dee243ff6c28422f">ip_chksum_pseudo</a>(<span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> proto_len,</div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  <span class="keyword">const</span> <a class="code" href="ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *src, <span class="keyword">const</span> <a class="code" href="ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *dest)</div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span> {</div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span> <span class="preprocessor">#if LWIP_IPV6</span></div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  <span class="keywordflow">if</span> (<a class="code" href="ip__addr_8h.html#a9bac7e938757f1d24df2404e8b57cb7d">IP_IS_V6</a>(dest)) {</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  <span class="keywordflow">return</span> ip6_chksum_pseudo(p, proto, proto_len, <a class="code" href="ip__addr_8h.html#a06e75bcd198012b5ba39480c233608bd">ip_2_ip6</a>(src), <a class="code" href="ip__addr_8h.html#a06e75bcd198012b5ba39480c233608bd">ip_2_ip6</a>(dest));</div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  }</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV6 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span> <span class="preprocessor">#if LWIP_IPV4 && LWIP_IPV6</span></div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV4 && LWIP_IPV6 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span> <span class="preprocessor">#if LWIP_IPV4</span></div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  {</div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="keywordflow">return</span> inet_chksum_pseudo(p, proto, proto_len, ip_2_ip4(src), ip_2_ip4(dest));</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  }</div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV4 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span> }</div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  </div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span> <span class="keyword">static</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span> inet_cksum_pseudo_partial_base(<span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> proto_len,</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chksum_len, <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> acc)</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span> {</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  <span class="keyword">struct </span><a class="code" href="structpbuf.html">pbuf</a> *q;</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> swapped = 0;</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chklen;</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  </div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  <span class="comment">/* iterate through all pbuf in chain */</span></div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  <span class="keywordflow">for</span> (q = p; (q != <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) && (chksum_len > 0); q = q-><a class="code" href="structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>) {</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  <a class="code" href="debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="lwipopts_8h.html#a78140cbe70258a65cb5c9e381843e4f3">INET_DEBUG</a>, (<span class="stringliteral">"inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n"</span>,</div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  (<span class="keywordtype">void</span> *)q, (<span class="keywordtype">void</span> *)q->next));</div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  chklen = q->len;</div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  <span class="keywordflow">if</span> (chklen > chksum_len) {</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  chklen = chksum_len;</div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  }</div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  acc += <a class="code" href="inet__chksum_8c.html#adaaa51e3290b80f8f8f8b1d080f54c1e">LWIP_CHKSUM</a>(q->payload, chklen);</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  chksum_len -= chklen;</div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  <a class="code" href="debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"delete me"</span>, chksum_len < 0x7fff);</div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  <span class="comment">/*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%"X32_F" \n", acc));*/</span></div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  <span class="comment">/* fold the upper bit down */</span></div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  <span class="keywordflow">if</span> (q->len % 2 != 0) {</div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  swapped = 1 - swapped;</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  acc = <a class="code" href="inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(acc);</div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span>  }</div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  <span class="comment">/*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): wrapped lwip_chksum()=%"X32_F" \n", acc));*/</span></div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span>  }</div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  </div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  <span class="keywordflow">if</span> (swapped) {</div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  acc = <a class="code" href="inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(acc);</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  }</div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  </div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  acc += (<a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a>)<a class="code" href="def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>((<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)proto);</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  acc += (<a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a>)<a class="code" href="def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(proto_len);</div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  </div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  <span class="comment">/* Fold 32-bit sum to 16 bits</span></div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span> <span class="comment"> calling this twice is probably faster than if statements... */</span></div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  <a class="code" href="debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="lwipopts_8h.html#a78140cbe70258a65cb5c9e381843e4f3">INET_DEBUG</a>, (<span class="stringliteral">"inet_chksum_pseudo(): pbuf chain lwip_chksum()=%"</span><a class="code" href="group__compiler__abstraction.html#gac219830a93d05c5f18f64ce87a34be14">X32_F</a><span class="stringliteral">"\n"</span>, acc));</div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  <span class="keywordflow">return</span> (<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)~(acc & 0xffffUL);</div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span> }</div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  </div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span> <span class="preprocessor">#if LWIP_IPV4</span></div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span> <span class="comment">/* inet_chksum_pseudo_partial:</span></div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span> <span class="comment"> * Calculates the IPv4 pseudo Internet checksum used by TCP and UDP for a pbuf chain.</span></div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span> <span class="comment"> * IP addresses are expected to be in network byte order.</span></div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span> <span class="comment"> * @param p chain of pbufs over that a checksum should be calculated (ip data part)</span></div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span> <span class="comment"> * @param src source ip address (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span> <span class="comment"> * @param dst destination ip address (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span> <span class="comment"> * @param proto ip protocol (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span> <span class="comment"> * @param proto_len length of the ip data part (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span> <span class="comment"> * @return checksum (as u16_t) to be saved directly in the protocol header</span></div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span> inet_chksum_pseudo_partial(<span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> proto_len,</div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chksum_len, <span class="keyword">const</span> ip4_addr_t *src, <span class="keyword">const</span> ip4_addr_t *dest)</div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span> {</div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> acc;</div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> addr;</div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  </div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  addr = ip4_addr_get_u32(src);</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  acc = (addr & 0xffffUL);</div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  acc += ((addr >> 16) & 0xffffUL);</div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  addr = ip4_addr_get_u32(dest);</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  acc += (addr & 0xffffUL);</div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  acc += ((addr >> 16) & 0xffffUL);</div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  <span class="comment">/* fold down to 16 bits */</span></div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  </div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  <span class="keywordflow">return</span> inet_cksum_pseudo_partial_base(p, proto, proto_len, chksum_len, acc);</div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span> }</div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV4 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  </div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span> <span class="preprocessor">#if LWIP_IPV6</span></div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  </div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span> ip6_chksum_pseudo_partial(<span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> proto_len,</div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chksum_len, <span class="keyword">const</span> ip6_addr_t *src, <span class="keyword">const</span> ip6_addr_t *dest)</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span> {</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> acc = 0;</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> addr;</div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> addr_part;</div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  </div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  <span class="keywordflow">for</span> (addr_part = 0; addr_part < 4; addr_part++) {</div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  addr = src->addr[addr_part];</div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span>  acc += (addr & 0xffffUL);</div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  acc += ((addr >> 16) & 0xffffUL);</div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  addr = dest->addr[addr_part];</div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  acc += (addr & 0xffffUL);</div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  acc += ((addr >> 16) & 0xffffUL);</div>
<div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  }</div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span>  <span class="comment">/* fold down to 16 bits */</span></div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00509"></a><span class="lineno"> 509</span>  </div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span>  <span class="keywordflow">return</span> inet_cksum_pseudo_partial_base(p, proto, proto_len, chksum_len, acc);</div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span> }</div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV6 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  </div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span> <span class="comment">/* ip_chksum_pseudo_partial:</span></div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span> <span class="comment"> * Calculates the IPv4 or IPv6 pseudo Internet checksum used by TCP and UDP for a pbuf chain.</span></div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span> <span class="comment"> * @param p chain of pbufs over that a checksum should be calculated (ip data part)</span></div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span> <span class="comment"> * @param src source ip address (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span> <span class="comment"> * @param dst destination ip address (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span> <span class="comment"> * @param proto ip protocol (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span> <span class="comment"> * @param proto_len length of the ip data part (used for checksum of pseudo header)</span></div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span> <span class="comment"> * @return checksum (as u16_t) to be saved directly in the protocol header</span></div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00526"></a><span class="lineno"><a class="line" href="inet__chksum_8c.html#acfe7ab6c63ef998210c66bb4822b03b2"> 526</a></span> <a class="code" href="inet__chksum_8c.html#acfe7ab6c63ef998210c66bb4822b03b2">ip_chksum_pseudo_partial</a>(<span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p, <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> proto_len,</div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chksum_len, <span class="keyword">const</span> <a class="code" href="ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *src, <span class="keyword">const</span> <a class="code" href="ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *dest)</div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span> {</div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span> <span class="preprocessor">#if LWIP_IPV6</span></div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  <span class="keywordflow">if</span> (<a class="code" href="ip__addr_8h.html#a9bac7e938757f1d24df2404e8b57cb7d">IP_IS_V6</a>(dest)) {</div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span>  <span class="keywordflow">return</span> ip6_chksum_pseudo_partial(p, proto, proto_len, chksum_len, <a class="code" href="ip__addr_8h.html#a06e75bcd198012b5ba39480c233608bd">ip_2_ip6</a>(src), <a class="code" href="ip__addr_8h.html#a06e75bcd198012b5ba39480c233608bd">ip_2_ip6</a>(dest));</div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  }</div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV6 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span> <span class="preprocessor">#if LWIP_IPV4 && LWIP_IPV6</span></div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV4 && LWIP_IPV6 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span> <span class="preprocessor">#if LWIP_IPV4</span></div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  {</div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span>  <span class="keywordflow">return</span> inet_chksum_pseudo_partial(p, proto, proto_len, chksum_len, ip_2_ip4(src), ip_2_ip4(dest));</div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span>  }</div>
<div class="line"><a name="l00541"></a><span class="lineno"> 541</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV4 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span> }</div>
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  </div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span> <span class="comment">/* inet_chksum:</span></div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span> <span class="comment"> * Calculates the Internet checksum over a portion of memory. Used primarily for IP</span></div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span> <span class="comment"> * and ICMP.</span></div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span> <span class="comment"> * @param dataptr start of the buffer to calculate the checksum (no alignment needed)</span></div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span> <span class="comment"> * @param len length of the buffer to calculate the checksum</span></div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span> <span class="comment"> * @return checksum (as u16_t) to be saved directly in the protocol header</span></div>
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  </div>
<div class="line"><a name="l00554"></a><span class="lineno"> 554</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00555"></a><span class="lineno"><a class="line" href="inet__chksum_8c.html#a34f1aa1587562a09e11b704b51bab043"> 555</a></span> <a class="code" href="inet__chksum_8c.html#a34f1aa1587562a09e11b704b51bab043">inet_chksum</a>(<span class="keyword">const</span> <span class="keywordtype">void</span> *dataptr, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>)</div>
<div class="line"><a name="l00556"></a><span class="lineno"> 556</span> {</div>
<div class="line"><a name="l00557"></a><span class="lineno"> 557</span>  <span class="keywordflow">return</span> (<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)~(<span class="keywordtype">unsigned</span> int)<a class="code" href="inet__chksum_8c.html#adaaa51e3290b80f8f8f8b1d080f54c1e">LWIP_CHKSUM</a>(dataptr, <a class="code" href="structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>);</div>
<div class="line"><a name="l00558"></a><span class="lineno"> 558</span> }</div>
<div class="line"><a name="l00559"></a><span class="lineno"> 559</span>  </div>
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00568"></a><span class="lineno"><a class="line" href="inet__chksum_8c.html#ab35967a50418358e194e8f80fdc3c865"> 568</a></span> <a class="code" href="inet__chksum_8c.html#ab35967a50418358e194e8f80fdc3c865">inet_chksum_pbuf</a>(<span class="keyword">struct</span> <a class="code" href="structpbuf.html">pbuf</a> *p)</div>
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span> {</div>
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  <a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> acc;</div>
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  <span class="keyword">struct </span><a class="code" href="structpbuf.html">pbuf</a> *q;</div>
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  <a class="code" href="group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> swapped;</div>
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  </div>
<div class="line"><a name="l00574"></a><span class="lineno"> 574</span>  acc = 0;</div>
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  swapped = 0;</div>
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span>  <span class="keywordflow">for</span> (q = p; q != <a class="code" href="fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; q = q-><a class="code" href="structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>) {</div>
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  acc += <a class="code" href="inet__chksum_8c.html#adaaa51e3290b80f8f8f8b1d080f54c1e">LWIP_CHKSUM</a>(q-><a class="code" href="structpbuf.html#a8d32dc3e964369d4eec638fc37fbc460">payload</a>, q-><a class="code" href="structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>);</div>
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  acc = <a class="code" href="inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  <span class="keywordflow">if</span> (q-><a class="code" href="structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> % 2 != 0) {</div>
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  swapped = 1 - swapped;</div>
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  acc = <a class="code" href="inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(acc);</div>
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  }</div>
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  }</div>
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  </div>
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  <span class="keywordflow">if</span> (swapped) {</div>
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span>  acc = <a class="code" href="inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(acc);</div>
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  }</div>
<div class="line"><a name="l00588"></a><span class="lineno"> 588</span>  <span class="keywordflow">return</span> (<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)~(acc & 0xffffUL);</div>
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span> }</div>
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span>  </div>
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span> <span class="comment">/* These are some implementations for LWIP_CHKSUM_COPY, which copies data</span></div>
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span> <span class="comment"> * like MEMCPY but generates a checksum at the same time. Since this is a</span></div>
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span> <span class="comment"> * performance-sensitive function, you might want to create your own version</span></div>
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span> <span class="comment"> * in assembly targeted at your hardware by defining it in lwipopts.h:</span></div>
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span> <span class="comment"> * #define LWIP_CHKSUM_COPY(dst, src, len) your_chksum_copy(dst, src, len)</span></div>
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  </div>
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span> <span class="preprocessor">#if (LWIP_CHKSUM_COPY_ALGORITHM == 1) </span><span class="comment">/* Version #1 */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  </div>
<div class="line"><a name="l00603"></a><span class="lineno"> 603</span> <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div>
<div class="line"><a name="l00604"></a><span class="lineno"> 604</span> lwip_chksum_copy(<span class="keywordtype">void</span> *dst, <span class="keyword">const</span> <span class="keywordtype">void</span> *src, <a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>)</div>
<div class="line"><a name="l00605"></a><span class="lineno"> 605</span> {</div>
<div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  <a class="code" href="lwipopts_8h.html#aa1dd57a66b6de8c0593e9e3e8d1411f6">MEMCPY</a>(dst, src, <a class="code" href="structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>);</div>
<div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  <span class="keywordflow">return</span> <a class="code" href="inet__chksum_8c.html#adaaa51e3290b80f8f8f8b1d080f54c1e">LWIP_CHKSUM</a>(dst, <a class="code" href="structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>);</div>
<div class="line"><a name="l00608"></a><span class="lineno"> 608</span> }</div>
<div class="line"><a name="l00609"></a><span class="lineno"> 609</span> <span class="preprocessor">#endif </span><span class="comment">/* (LWIP_CHKSUM_COPY_ALGORITHM == 1) */</span><span class="preprocessor"></span></div>
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<div class="ttc" id="ainet__chksum_8c_html_acfe7ab6c63ef998210c66bb4822b03b2"><div class="ttname"><a href="inet__chksum_8c.html#acfe7ab6c63ef998210c66bb4822b03b2">ip_chksum_pseudo_partial</a></div><div class="ttdeci">u16_t ip_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len, u16_t chksum_len, const ip_addr_t *src, const ip_addr_t *dest)</div><div class="ttdef"><b>Definition:</b> <a href="inet__chksum_8c_source.html#l00526">inet_chksum.c:526</a></div></div>
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<div class="ttc" id="ainet__chksum_8c_html_ab35967a50418358e194e8f80fdc3c865"><div class="ttname"><a href="inet__chksum_8c.html#ab35967a50418358e194e8f80fdc3c865">inet_chksum_pbuf</a></div><div class="ttdeci">u16_t inet_chksum_pbuf(struct pbuf *p)</div><div class="ttdef"><b>Definition:</b> <a href="inet__chksum_8c_source.html#l00568">inet_chksum.c:568</a></div></div>
<div class="ttc" id="ainet__chksum_8c_html_adaaa51e3290b80f8f8f8b1d080f54c1e"><div class="ttname"><a href="inet__chksum_8c.html#adaaa51e3290b80f8f8f8b1d080f54c1e">LWIP_CHKSUM</a></div><div class="ttdeci">#define LWIP_CHKSUM</div><div class="ttdef"><b>Definition:</b> <a href="inet__chksum_8c_source.html#l00057">inet_chksum.c:57</a></div></div>
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