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.TH "SK_CHK_FILTER" "9" "29 May 2003" "" ""

.SH NAME
sk_chk_filter \- verify socket filter code
.SH SYNOPSIS
.sp
\fB
.sp
int sk_chk_filter  (struct sock_filter * \fIfilter\fB, int \fIflen\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIfilter\fB\fR
filter to verify
.TP
\fB\fIflen\fB\fR
length of filter
.SH "DESCRIPTION"
.PP
Check the user's filter code. If we let some ugly
filter code slip through kaboom! The filter must contain
no references or jumps that are out of range, no illegal instructions
and no backward jumps. It must end with a RET instruction
.PP
Returns 0 if the rule set is legal or a negative errno code if not.
.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 2.5.70.