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.TH "SK_CHK_FILTER" "9" "09 October 2005" "" ""

.SH NAME
sk_chk_filter \- verify socket filter code
.SH SYNOPSIS
"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.