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<div class="textblock"><code>#include &quot;<a class="el" href="../../dc/dba/opt_8h_source.html">net/opt.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="../../d0/d35/pbuf_8h_source.html">net/pbuf.h</a>&quot;</code><br />
<code>#include &quot;<a class="el" href="../../de/df7/ip__addr_8h_source.html">net/ip_addr.h</a>&quot;</code><br />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for inet_chksum.h:</div>
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<p><a href="../../d2/d45/inet__chksum_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:a6ffe83b4bdd1784a0671ee4778966a01"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d45/inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(u)&#160;&#160;&#160;(((u) &gt;&gt; 16) + ((u) &amp; 0x0000ffffUL))</td></tr>
<tr class="separator:a6ffe83b4bdd1784a0671ee4778966a01"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8b8abbe02c3da468346b45f3d5a356a3"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d45/inet__chksum_8h.html#a8b8abbe02c3da468346b45f3d5a356a3">LWIP_CHKSUM_COPY_ALGORITHM</a>&#160;&#160;&#160;0</td></tr>
<tr class="separator:a8b8abbe02c3da468346b45f3d5a356a3"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a0196bd603262882d16b5264b52eafe18"><td class="memItemLeft" align="right" valign="top">#define&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d45/inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(w)&#160;&#160;&#160;(((w) &amp; 0xff) &lt;&lt; 8) | (((w) &amp; 0xff00) &gt;&gt; 8)</td></tr>
<tr class="separator:a0196bd603262882d16b5264b52eafe18"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a34f1aa1587562a09e11b704b51bab043"><td class="memItemLeft" align="right" valign="top"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d45/inet__chksum_8h.html#a34f1aa1587562a09e11b704b51bab043">inet_chksum</a> (<a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> void *dataptr, <a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> len)</td></tr>
<tr class="separator:a34f1aa1587562a09e11b704b51bab043"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ab35967a50418358e194e8f80fdc3c865"><td class="memItemLeft" align="right" valign="top"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d45/inet__chksum_8h.html#ab35967a50418358e194e8f80fdc3c865">inet_chksum_pbuf</a> (struct <a class="el" href="../../d9/db8/structpbuf.html">pbuf</a> *p)</td></tr>
<tr class="separator:ab35967a50418358e194e8f80fdc3c865"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aa13cda42e7c262f5dee243ff6c28422f"><td class="memItemLeft" align="right" valign="top"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d45/inet__chksum_8h.html#aa13cda42e7c262f5dee243ff6c28422f">ip_chksum_pseudo</a> (struct <a class="el" href="../../d9/db8/structpbuf.html">pbuf</a> *p, <a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto, <a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> proto_len, <a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> <a class="el" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *src, <a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> <a class="el" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *dest)</td></tr>
<tr class="separator:aa13cda42e7c262f5dee243ff6c28422f"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:acfe7ab6c63ef998210c66bb4822b03b2"><td class="memItemLeft" align="right" valign="top"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d2/d45/inet__chksum_8h.html#acfe7ab6c63ef998210c66bb4822b03b2">ip_chksum_pseudo_partial</a> (struct <a class="el" href="../../d9/db8/structpbuf.html">pbuf</a> *p, <a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> proto, <a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> proto_len, <a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chksum_len, <a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> <a class="el" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *src, <a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> <a class="el" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *dest)</td></tr>
<tr class="separator:acfe7ab6c63ef998210c66bb4822b03b2"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>IP checksum calculation functions </p>

<p class="definition">Definition in file <a class="el" href="../../d2/d45/inet__chksum_8h_source.html">inet_chksum.h</a>.</p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
<a id="a6ffe83b4bdd1784a0671ee4778966a01"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a6ffe83b4bdd1784a0671ee4778966a01">&#9670;&nbsp;</a></span>FOLD_U32T</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define FOLD_U32T</td>
          <td>(</td>
          <td class="paramtype">&#160;</td>
          <td class="paramname">u</td><td>)</td>
          <td>&#160;&#160;&#160;(((u) &gt;&gt; 16) + ((u) &amp; 0x0000ffffUL))</td>
        </tr>
      </table>
</div><div class="memdoc">
<p>Split an u32_t in two u16_ts and add them up </p>

<p class="definition">Definition at line <a class="el" href="../../d2/d45/inet__chksum_8h_source.html#l00052">52</a> of file <a class="el" href="../../d2/d45/inet__chksum_8h_source.html">inet_chksum.h</a>.</p>

</div>
</div>
<a id="a8b8abbe02c3da468346b45f3d5a356a3"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a8b8abbe02c3da468346b45f3d5a356a3">&#9670;&nbsp;</a></span>LWIP_CHKSUM_COPY_ALGORITHM</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define LWIP_CHKSUM_COPY_ALGORITHM&#160;&#160;&#160;0</td>
        </tr>
      </table>
</div><div class="memdoc">

<p class="definition">Definition at line <a class="el" href="../../d2/d45/inet__chksum_8h_source.html#l00067">67</a> of file <a class="el" href="../../d2/d45/inet__chksum_8h_source.html">inet_chksum.h</a>.</p>

</div>
</div>
<a id="a0196bd603262882d16b5264b52eafe18"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0196bd603262882d16b5264b52eafe18">&#9670;&nbsp;</a></span>SWAP_BYTES_IN_WORD</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">#define SWAP_BYTES_IN_WORD</td>
          <td>(</td>
          <td class="paramtype">&#160;</td>
          <td class="paramname">w</td><td>)</td>
          <td>&#160;&#160;&#160;(((w) &amp; 0xff) &lt;&lt; 8) | (((w) &amp; 0xff00) &gt;&gt; 8)</td>
        </tr>
      </table>
</div><div class="memdoc">
<p>Swap the bytes in an u16_t: much like <a class="el" href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons()</a> for little-endian </p>

<p class="definition">Definition at line <a class="el" href="../../d2/d45/inet__chksum_8h_source.html#l00047">47</a> of file <a class="el" href="../../d2/d45/inet__chksum_8h_source.html">inet_chksum.h</a>.</p>

</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="a34f1aa1587562a09e11b704b51bab043"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a34f1aa1587562a09e11b704b51bab043">&#9670;&nbsp;</a></span>inet_chksum()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> inet_chksum </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> void *&#160;</td>
          <td class="paramname"><em>dataptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>&#160;</td>
          <td class="paramname"><em>len</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p class="definition">Definition at line <a class="el" href="../../da/d81/inet__chksum_8c_source.html#l00555">555</a> of file <a class="el" href="../../da/d81/inet__chksum_8c_source.html">inet_chksum.c</a>.</p>

<p class="reference">References <a class="el" href="../../d0/d35/pbuf_8h_source.html#l00159">pbuf::len</a>, and <a class="el" href="../../da/d81/inet__chksum_8c_source.html#l00057">LWIP_CHKSUM</a>.</p>

</div>
</div>
<a id="ab35967a50418358e194e8f80fdc3c865"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ab35967a50418358e194e8f80fdc3c865">&#9670;&nbsp;</a></span>inet_chksum_pbuf()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> inet_chksum_pbuf </td>
          <td>(</td>
          <td class="paramtype">struct <a class="el" href="../../d9/db8/structpbuf.html">pbuf</a> *&#160;</td>
          <td class="paramname"><em>p</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">
<p>Calculate a checksum over a chain of pbufs (without pseudo-header, much like inet_chksum only pbufs are used).</p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">p</td><td>pbuf chain over that the checksum should be calculated </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>checksum (as u16_t) to be saved directly in the protocol header </dd></dl>

<p class="definition">Definition at line <a class="el" href="../../da/d81/inet__chksum_8c_source.html#l00568">568</a> of file <a class="el" href="../../da/d81/inet__chksum_8c_source.html">inet_chksum.c</a>.</p>

<p class="reference">References <a class="el" href="../../d2/d45/inet__chksum_8h_source.html#l00052">FOLD_U32T</a>, <a class="el" href="../../d0/d35/pbuf_8h_source.html#l00159">pbuf::len</a>, <a class="el" href="../../da/d81/inet__chksum_8c_source.html#l00057">LWIP_CHKSUM</a>, <a class="el" href="../../d0/d35/pbuf_8h_source.html#l00144">pbuf::next</a>, <a class="el" href="../../d6/d8a/fat__string_8h_source.html#l00017">NULL</a>, <a class="el" href="../../d0/d35/pbuf_8h_source.html#l00147">pbuf::payload</a>, and <a class="el" href="../../d2/d45/inet__chksum_8h_source.html#l00047">SWAP_BYTES_IN_WORD</a>.</p>

</div>
</div>
<a id="aa13cda42e7c262f5dee243ff6c28422f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa13cda42e7c262f5dee243ff6c28422f">&#9670;&nbsp;</a></span>ip_chksum_pseudo()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> ip_chksum_pseudo </td>
          <td>(</td>
          <td class="paramtype">struct <a class="el" href="../../d9/db8/structpbuf.html">pbuf</a> *&#160;</td>
          <td class="paramname"><em>p</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>&#160;</td>
          <td class="paramname"><em>proto</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>&#160;</td>
          <td class="paramname"><em>proto_len</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> <a class="el" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *&#160;</td>
          <td class="paramname"><em>src</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> <a class="el" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *&#160;</td>
          <td class="paramname"><em>dest</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
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<p class="definition">Definition at line <a class="el" href="../../da/d81/inet__chksum_8c_source.html#l00379">379</a> of file <a class="el" href="../../da/d81/inet__chksum_8c_source.html">inet_chksum.c</a>.</p>

<p class="reference">References <a class="el" href="../../de/df7/ip__addr_8h_source.html#l00301">ip_2_ip6</a>, and <a class="el" href="../../de/df7/ip__addr_8h_source.html#l00296">IP_IS_V6</a>.</p>

</div>
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<a id="acfe7ab6c63ef998210c66bb4822b03b2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#acfe7ab6c63ef998210c66bb4822b03b2">&#9670;&nbsp;</a></span>ip_chksum_pseudo_partial()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> ip_chksum_pseudo_partial </td>
          <td>(</td>
          <td class="paramtype">struct <a class="el" href="../../d9/db8/structpbuf.html">pbuf</a> *&#160;</td>
          <td class="paramname"><em>p</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>&#160;</td>
          <td class="paramname"><em>proto</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>&#160;</td>
          <td class="paramname"><em>proto_len</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>&#160;</td>
          <td class="paramname"><em>chksum_len</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> <a class="el" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *&#160;</td>
          <td class="paramname"><em>src</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> <a class="el" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *&#160;</td>
          <td class="paramname"><em>dest</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p class="definition">Definition at line <a class="el" href="../../da/d81/inet__chksum_8c_source.html#l00526">526</a> of file <a class="el" href="../../da/d81/inet__chksum_8c_source.html">inet_chksum.c</a>.</p>

<p class="reference">References <a class="el" href="../../de/df7/ip__addr_8h_source.html#l00301">ip_2_ip6</a>, and <a class="el" href="../../de/df7/ip__addr_8h_source.html#l00296">IP_IS_V6</a>.</p>

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