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.TH "SKB_COPY_EXPAND" "9" "09 April 2004" "" ""

.SH NAME
skb_copy_expand \- copy and expand sk_buff
.SH SYNOPSIS
.sp
\fB
.sp
struct sk_buff * skb_copy_expand  (const struct sk_buff * \fIskb\fB, int \fInewheadroom\fB, int \fInewtailroom\fB, int \fIgfp_mask\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIskb\fB\fR
buffer to copy
.TP
\fB\fInewheadroom\fB\fR
new free bytes at head
.TP
\fB\fInewtailroom\fB\fR
new free bytes at tail
.TP
\fB\fIgfp_mask\fB\fR
allocation priority
.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 NULL on failure or the pointer to the buffer
on success. The returned buffer has a reference count of 1.
.PP
You must pass GFP_ATOMIC as the allocation priority if this function
is called from an interrupt.
.SH "BUG ALERT"
.PP
ip_summed is not copied. Why does this work? Is it used
only by netfilter in the cases when checksum is recalculated? --ANK
.SH "ABOUT THIS DOCUMENT"
.PP
This documentation is free software; you can redistribute
it and/or modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later
version.
.PP
This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
.PP
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
MA 02111-1307 USA
.PP
For more details see the file COPYING in the source
distribution of Linux.
.PP
If you have comments on the formatting of this manpage, then please contact
Michael Still (mikal@stillhq.com).
.PP
This documentation was generated with kernel version 2.6.0.