'\" t
.\"     Title: skb_copy_expand
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: September 2017
.\"    Manual: Linux Networking
.\"    Source: Kernel Hackers Manual 4.12.13
.\"  Language: English
.\"
.TH "SKB_COPY_EXPAND" "9" "September 2017" "Kernel Hackers Manual 4\&.12\&" "Linux Networking"
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.SH "NAME"
skb_copy_expand \- copy and expand sk_buff
.SH "SYNOPSIS"
.HP \w'struct\ sk_buff\ *\ skb_copy_expand('u
.BI "struct sk_buff * skb_copy_expand(const\ struct\ sk_buff\ *\ " "skb" ", int\ " "newheadroom" ", int\ " "newtailroom" ", gfp_t\ " "gfp_mask" ");"
.SH "ARGUMENTS"
.PP
\fIconst struct sk_buff * skb\fR
.RS 4
buffer to copy
.RE
.PP
\fIint newheadroom\fR
.RS 4
new free bytes at head
.RE
.PP
\fIint newtailroom\fR
.RS 4
new free bytes at tail
.RE
.PP
\fIgfp_t gfp_mask\fR
.RS 4
allocation priority
.RE
.SH "DESCRIPTION"
.PP
Make a copy of both an &sk_buff and its data and while doing so allocate additional space\&.
.PP
This is used when the caller wishes to modify the data and needs a private copy of the data to alter as well as more space for new fields\&. Returns
\fBNULL\fR
on failure or the pointer to the buffer on success\&. The returned buffer has a reference count of 1\&.
.PP
You must pass
\fBGFP_ATOMIC\fR
as the allocation priority if this function is called from an interrupt\&.
.SH "COPYRIGHT"
.br