sk_chk_filter9
Verify socket filter code
Usage
int sk_chk_filter(struct sock_filter * filter, unsigned int flen);
Arguments
filter
filter to verify
flen
length of filter
Overview
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 must end with a RET instruction.
All jumps are forward as they are not signed.
Returns 0 if the rule set is legal or -EINVAL if not.
Releases
5 releases since Debian 4.0 (Etch); the text changed 4 times.