1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>skb_partial_csum_set</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Networking and Network Devices APIs"><link rel="up" href="ch01s02.html" title="Socket Buffer Functions"><link rel="prev" href="API-skb-clone-sk.html" title="skb_clone_sk"><link rel="next" href="API-skb-checksum-setup.html" title="skb_checksum_setup"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">skb_partial_csum_set</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-skb-clone-sk.html">Prev</a>&#160;</td><th width="60%" align="center">Socket Buffer Functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-skb-checksum-setup.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-skb-partial-csum-set"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>skb_partial_csum_set &#8212; 
2     set up and verify partial csum values for packet
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">bool <b class="fsfunc">skb_partial_csum_set </b>(</code></td><td>struct sk_buff * <var class="pdparam">skb</var>, </td></tr><tr><td>&#160;</td><td>u16 <var class="pdparam">start</var>, </td></tr><tr><td>&#160;</td><td>u16 <var class="pdparam">off</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1096407252"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>skb</code></em></span></dt><dd><p>
4     the skb to set
5    </p></dd><dt><span class="term"><em class="parameter"><code>start</code></em></span></dt><dd><p>
6     the number of bytes after skb-&gt;data to start checksumming.
7    </p></dd><dt><span class="term"><em class="parameter"><code>off</code></em></span></dt><dd><p>
8     the offset from start to place the checksum.
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1096410940"></a><h2>Description</h2><p>
10   For untrusted partially-checksummed packets, we need to make sure the values
11   for skb-&gt;csum_start and skb-&gt;csum_offset are valid so we don't oops.
12   </p><p>
13
14   This function checks and sets those values and skb-&gt;ip_summed: if this
15   returns false you should drop the packet.
16</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-skb-clone-sk.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="ch01s02.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-skb-checksum-setup.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">skb_clone_sk</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">skb_checksum_setup</span></td></tr></table></div></body></html>
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