pf_test6
if (pf_test6(PF_OUT, ifp, &m0, NULL, NULL) != PF_PASS) {
chk = pf_test6(PF_IN, ifp, m, NULL, NULL);
chk = pf_test6(PF_OUT, ifp, m, NULL, NULL);
int pf_test6(int, struct ifnet *, struct mbuf **, struct ether_header *, struct inpcb *);