npfk_packet_handler
return npfk_packet_handler(npf, mp, ifp, di);
int npfk_packet_handler(npf_t *, struct mbuf **, struct ifnet *, int);
error = npfk_packet_handler(npf, &m, ifp, t->di);
error = npfk_packet_handler(npf, &m, ifp, PFIL_OUT);
error = npfk_packet_handler(npf, &m, ifp, t->di);
error = npfk_packet_handler(npf, &m, ifp, t->di);
error = npfk_packet_handler(npf, &m, ifp, forw ? PFIL_OUT : PFIL_IN);