npfk_layer2_handler
return npfk_layer2_handler(npf, mp, ifp, di);
int npfk_layer2_handler(npf_t *, struct mbuf **, struct ifnet *, int);
error = npfk_layer2_handler(npf, &m, ifp, t->di);
error = npfk_layer2_handler(npf, &m, ifp, t->di);