<?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>struct sk_buff</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-struct-skb-shared-hwtstamps.html" title="struct skb_shared_hwtstamps" /><link rel="next" href="API-skb-dst.html" title="skb_dst" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>struct sk_buff</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-struct-skb-shared-hwtstamps.html">Prev</a> </td><th width="60%" align="center">Socket Buffer Functions</th><td width="20%" align="right"> <a accesskey="n" href="API-skb-dst.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="struct sk_buff"><a id="API-struct-sk-buff"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>struct sk_buff — socket buffer </p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><pre class="programlisting"> struct sk_buff { struct sk_buff * next; struct sk_buff * prev; ktime_t tstamp; struct sock * sk; struct net_device * dev; char cb[48]; unsigned long _skb_refdst; #ifdef CONFIG_XFRM struct sec_path * sp; #endif unsigned int len; unsigned int data_len; __u16 mac_len; __u16 hdr_len; union {unnamed_union}; __u16 vlan_tci; sk_buff_data_t transport_header; sk_buff_data_t network_header; sk_buff_data_t mac_header; sk_buff_data_t tail; sk_buff_data_t end; unsigned char * head; unsigned char * data; unsigned int truesize; atomic_t users; }; </pre></div><div class="refsect1" title="Members"><a id="id2837350"></a><h2>Members</h2><div class="variablelist"><dl><dt><span class="term">next</span></dt><dd><p> Next buffer in list </p></dd><dt><span class="term">prev</span></dt><dd><p> Previous buffer in list </p></dd><dt><span class="term">tstamp</span></dt><dd><p> Time we arrived </p></dd><dt><span class="term">sk</span></dt><dd><p> Socket we are owned by </p></dd><dt><span class="term">dev</span></dt><dd><p> Device we arrived on/are leaving by </p></dd><dt><span class="term">cb[48]</span></dt><dd><p> Control buffer. Free for use by every layer. Put private vars here </p></dd><dt><span class="term">_skb_refdst</span></dt><dd><p> destination entry (with norefcount bit) </p></dd><dt><span class="term">sp</span></dt><dd><p> the security path, used for xfrm </p></dd><dt><span class="term">len</span></dt><dd><p> Length of actual data </p></dd><dt><span class="term">data_len</span></dt><dd><p> Data length </p></dd><dt><span class="term">mac_len</span></dt><dd><p> Length of link layer header </p></dd><dt><span class="term">hdr_len</span></dt><dd><p> writable header length of cloned skb </p></dd><dt><span class="term">{unnamed_union}</span></dt><dd><p> anonymous </p></dd><dt><span class="term">vlan_tci</span></dt><dd><p> vlan tag control information </p></dd><dt><span class="term">transport_header</span></dt><dd><p> Transport layer header </p></dd><dt><span class="term">network_header</span></dt><dd><p> Network layer header </p></dd><dt><span class="term">mac_header</span></dt><dd><p> Link layer header </p></dd><dt><span class="term">tail</span></dt><dd><p> Tail pointer </p></dd><dt><span class="term">end</span></dt><dd><p> End pointer </p></dd><dt><span class="term">head</span></dt><dd><p> Head of buffer </p></dd><dt><span class="term">data</span></dt><dd><p> Data head pointer </p></dd><dt><span class="term">truesize</span></dt><dd><p> Buffer size </p></dd><dt><span class="term">users</span></dt><dd><p> User count - see {datagram,tcp}.c </p></dd></dl></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-struct-skb-shared-hwtstamps.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-dst.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>struct skb_shared_hwtstamps</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_dst</span></td></tr></table></div></body></html>