<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <HTML ><HEAD ><TITLE >pskb_expand_head</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="The Linux Kernel API" HREF="book1.html"><LINK REL="UP" TITLE="Socket Buffer Functions" HREF="c4743.html#AEN4745"><LINK REL="PREVIOUS" TITLE="pskb_copy" HREF="r5980.html"><LINK REL="NEXT" TITLE="skb_copy_expand" HREF="r6063.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >The Linux Kernel API</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="r5980.html" ACCESSKEY="P" ><<< Previous</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="r6063.html" ACCESSKEY="N" >Next >>></A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="AEN6014" ></A ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >pskb_expand_head</SPAN ></SPAN ></H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN6018" ></A ><H2 >Name</H2 >pskb_expand_head -- reallocate header of <SPAN CLASS="STRUCTNAME" >sk_buff</SPAN > </DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN6022" ></A ><H2 >Synopsis</H2 ><DIV CLASS="FUNCSYNOPSIS" ><A NAME="AEN6024" ></A ><P ></P ><P ><CODE ><CODE CLASS="FUNCDEF" >int <TT CLASS="FUNCTION" >pskb_expand_head </TT ></CODE >(struct sk_buff * <TT CLASS="PARAMETER" ><I >skb</I ></TT >, int <TT CLASS="PARAMETER" ><I >nhead</I ></TT >, int <TT CLASS="PARAMETER" ><I >ntail</I ></TT >, int <TT CLASS="PARAMETER" ><I >gfp_mask</I ></TT >);</CODE ></P ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN6036" ></A ><H2 >Arguments</H2 ><P ></P ><DIV CLASS="VARIABLELIST" ><DL ><DT ><TT CLASS="PARAMETER" ><I >skb</I ></TT ></DT ><DD ><P > buffer to reallocate </P ></DD ><DT ><TT CLASS="PARAMETER" ><I >nhead</I ></TT ></DT ><DD ><P > room to add at head </P ></DD ><DT ><TT CLASS="PARAMETER" ><I >ntail</I ></TT ></DT ><DD ><P > room to add at tail </P ></DD ><DT ><TT CLASS="PARAMETER" ><I >gfp_mask</I ></TT ></DT ><DD ><P > allocation priority </P ></DD ></DL ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN6059" ></A ><H2 >Description</H2 ><P > Expands (or creates identical copy, if &nhead and &ntail are zero) header of skb. &sk_buff itself is not changed. &sk_buff MUST have reference count of 1. Returns zero in the case of success or error, if expansion failed. In the last case, &sk_buff is not changed. </P ><P > All the pointers pointing into skb header may change and must be reloaded after call to this function. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="r5980.html" ACCESSKEY="P" ><<< Previous</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="book1.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="r6063.html" ACCESSKEY="N" >Next >>></A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >pskb_copy</SPAN ></SPAN ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="c4743.html#AEN4745" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><SPAN CLASS="phrase" ><SPAN CLASS="PHRASE" >skb_copy_expand</SPAN ></SPAN ></TD ></TR ></TABLE ></DIV ></BODY ></HTML >