<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>skb_push</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /><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-put.html" title="skb_put" /><link rel="next" href="API-skb-pull.html" title="skb_pull" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>skb_push</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-skb-put.html">Prev</a> </td><th width="60%" align="center">Socket Buffer Functions</th><td width="20%" align="right"> <a accesskey="n" href="API-skb-pull.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="skb_push"><a id="API-skb-push"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>skb_push — add data to the start of a buffer </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">unsigned char * <strong>fsfuncskb_push </strong>(</code></td><td>struct sk_buff * <var class="pdparam">skb</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">len</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2896440"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>skb</code></em></span></dt><dd><p> buffer to use </p></dd><dt><span class="term"><em class="parameter"><code>len</code></em></span></dt><dd><p> amount of data to add </p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2896482"></a><h2>Description</h2><p> This function extends the used data area of the buffer at the buffer start. If this would exceed the total buffer headroom the kernel will panic. A pointer to the first byte of the extra data is returned. </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-put.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch01s02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-skb-pull.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>skb_put</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>skb_pull</span></td></tr></table></div></body></html>