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<div class="title">inet_chksum.c File Reference</div> </div>
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<div class="textblock"><code>#include "<a class="el" href="../../dc/dba/opt_8h_source.html">net/opt.h</a>"</code><br />
<code>#include "<a class="el" href="../../d2/d45/inet__chksum_8h_source.html">net/inet_chksum.h</a>"</code><br />
<code>#include "<a class="el" href="../../d4/da4/def_8h_source.html">net/def.h</a>"</code><br />
<code>#include "<a class="el" href="../../de/df7/ip__addr_8h_source.html">net/ip_addr.h</a>"</code><br />
<code>#include <<a class="el" href="../../da/d66/string_8h_source.html">string.h</a>></code><br />
</div><div class="textblock"><div class="dynheader">
Include dependency graph for inet_chksum.c:</div>
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<p><a href="../../da/d81/inet__chksum_8c_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:adaaa51e3290b80f8f8f8b1d080f54c1e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d81/inet__chksum_8c.html#adaaa51e3290b80f8f8f8b1d080f54c1e">LWIP_CHKSUM</a>   <a class="el" href="../../da/d81/inet__chksum_8c.html#a4c8d40559878aa9bf6bfce8d8ab8a72b">lwip_standard_chksum</a></td></tr>
<tr class="separator:adaaa51e3290b80f8f8f8b1d080f54c1e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:aa0865f14286191bd72fc1a9d9cbe25d4"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d81/inet__chksum_8c.html#aa0865f14286191bd72fc1a9d9cbe25d4">LWIP_CHKSUM_ALGORITHM</a>   2</td></tr>
<tr class="separator:aa0865f14286191bd72fc1a9d9cbe25d4"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<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> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d81/inet__chksum_8c.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"> </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> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d81/inet__chksum_8c.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"> </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> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d81/inet__chksum_8c.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"> </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> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d81/inet__chksum_8c.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"> </td></tr>
<tr class="memitem:a4c8d40559878aa9bf6bfce8d8ab8a72b"><td class="memItemLeft" align="right" valign="top"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d81/inet__chksum_8c.html#a4c8d40559878aa9bf6bfce8d8ab8a72b">lwip_standard_chksum</a> (<a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> void *dataptr, int len)</td></tr>
<tr class="separator:a4c8d40559878aa9bf6bfce8d8ab8a72b"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Incluse internet checksum functions.<br />
These are some reference implementations of the checksum algorithm, with the aim of being simple, correct and fully portable. Checksumming is the first thing you would want to optimize for your platform. If you create your own version, link it in and in your <a class="el" href="../../dc/df0/cc_8h.html">cc.h</a> put:</p>
<p>#define LWIP_CHKSUM your_checksum_routine</p>
<p>Or you can select from the implementations below by defining LWIP_CHKSUM_ALGORITHM to 1, 2 or 3. </p>
<p class="definition">Definition in file <a class="el" href="../../da/d81/inet__chksum_8c_source.html">inet_chksum.c</a>.</p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
<a id="adaaa51e3290b80f8f8f8b1d080f54c1e"></a>
<h2 class="memtitle"><span class="permalink"><a href="#adaaa51e3290b80f8f8f8b1d080f54c1e">◆ </a></span>LWIP_CHKSUM</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define LWIP_CHKSUM   <a class="el" href="../../da/d81/inet__chksum_8c.html#a4c8d40559878aa9bf6bfce8d8ab8a72b">lwip_standard_chksum</a></td>
</tr>
</table>
</div><div class="memdoc">
<p class="definition">Definition at line <a class="el" href="../../da/d81/inet__chksum_8c_source.html#l00057">57</a> of file <a class="el" href="../../da/d81/inet__chksum_8c_source.html">inet_chksum.c</a>.</p>
</div>
</div>
<a id="aa0865f14286191bd72fc1a9d9cbe25d4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#aa0865f14286191bd72fc1a9d9cbe25d4">◆ </a></span>LWIP_CHKSUM_ALGORITHM</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define LWIP_CHKSUM_ALGORITHM   2</td>
</tr>
</table>
</div><div class="memdoc">
<p class="definition">Definition at line <a class="el" href="../../da/d81/inet__chksum_8c_source.html#l00059">59</a> of file <a class="el" href="../../da/d81/inet__chksum_8c_source.html">inet_chksum.c</a>.</p>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a id="a34f1aa1587562a09e11b704b51bab043"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a34f1aa1587562a09e11b704b51bab043">◆ </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 * </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> </td>
<td class="paramname"><em>len</em> </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">◆ </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> * </td>
<td class="paramname"><em>p</em></td><td>)</td>
<td></td>
</tr>
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</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">◆ </a></span>ip_chksum_pseudo()</h2>
<div class="memitem">
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<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> * </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> </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> </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> * </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> * </td>
<td class="paramname"><em>dest</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<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>
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<a id="acfe7ab6c63ef998210c66bb4822b03b2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#acfe7ab6c63ef998210c66bb4822b03b2">◆ </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> * </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> </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> </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> </td>
<td class="paramname"><em>chksum_len</em>, </td>
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<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> * </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> * </td>
<td class="paramname"><em>dest</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
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</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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<a id="a4c8d40559878aa9bf6bfce8d8ab8a72b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4c8d40559878aa9bf6bfce8d8ab8a72b">◆ </a></span>lwip_standard_chksum()</h2>
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<td class="memname"><a class="el" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> lwip_standard_chksum </td>
<td>(</td>
<td class="paramtype"><a class="el" href="../../d6/d92/cdefs_8h.html#a2c212835823e3c54a8ab6d95c652660e">const</a> void * </td>
<td class="paramname"><em>dataptr</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>len</em> </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#l00133">133</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>, and <a class="el" href="../../d2/d45/inet__chksum_8h_source.html#l00047">SWAP_BYTES_IN_WORD</a>.</p>
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