1. NAME▲

sk_chk_filter - verify socket filter code

2. SYNOPSIS ▲

int sk_chk_filter(struct sock_filter *  filter , unsigned int  flen );

3. ARGUMENTS ▲

filter
    filter to verify

flen
    length of filter

4. DESCRIPTION ▲

Check the userAqs 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.

5. COPYRIGHT ▲