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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>sk_filter</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Networking and Network Devices APIs" /><link rel="up" href="ch01s03.html" title="Socket Filter" /><link rel="prev" href="ch01s03.html" title="Socket Filter" /><link rel="next" href="re113.html" title="sk_run_filter" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>sk_filter</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch01s03.html">Prev</a> </td><th width="60%" align="center">Socket Filter</th><td width="20%" align="right"> <a accesskey="n" href="re113.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="sk_filter"><a id="API-sk-filter"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sk_filter —
run a packet through a socket filter
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">sk_filter </b>(</code></td><td>struct sock * <var class="pdparam">sk</var>, </td></tr><tr><td> </td><td>struct sk_buff * <var class="pdparam">skb</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2735149"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>sk</code></em></span></dt><dd><p>
sock associated with <span class="structname">sk_buff</span>
</p></dd><dt><span class="term"><em class="parameter"><code>skb</code></em></span></dt><dd><p>
buffer to filter
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2735196"></a><h2>Description</h2><p>
Run the filter code and then cut skb->data to correct size returned by
sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller
than pkt_len we keep whole skb->data. This is the socket level
wrapper to sk_run_filter. It returns 0 if the packet should
be accepted or -EPERM if the packet should be tossed.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch01s03.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch01s03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re113.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Socket Filter </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>sk_run_filter</span></td></tr></table></div></body></html>
