'\" t
.\"     Title: pskb_expand_head
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: March 2017
.\"    Manual: Linux Networking
.\"    Source: Kernel Hackers Manual 4.10.7
.\"  Language: English
.\"
.TH "PSKB_EXPAND_HEAD" "9" "March 2017" "Kernel Hackers Manual 4\&.10\&" "Linux Networking"
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.SH "NAME"
pskb_expand_head \- reallocate header of sk_buff
.SH "SYNOPSIS"
.HP \w'int\ pskb_expand_head('u
.BI "int pskb_expand_head(struct\ sk_buff\ *\ " "skb" ", int\ " "nhead" ", int\ " "ntail" ", gfp_t\ " "gfp_mask" ");"
.SH "ARGUMENTS"
.PP
\fIskb\fR
.RS 4
buffer to reallocate
.RE
.PP
\fInhead\fR
.RS 4
room to add at head
.RE
.PP
\fIntail\fR
.RS 4
room to add at tail
.RE
.PP
\fIgfp_mask\fR
.RS 4
allocation priority
.RE
.SH "DESCRIPTION"
.PP
Expands (or creates identical copy, if
\fInhead\fR
and
\fIntail\fR
are zero) header of
\fIskb\fR\&.
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\&.
.PP
All the pointers pointing into skb header may change and must be reloaded after call to this function\&.
.SH "COPYRIGHT"
.br