NPF_NAT_PORTMAP
nt = npf_nat_create(NPF_NATOUT, NPF_NAT_PORTS | NPF_NAT_PORTMAP, NULL);
if ((np->n_flags & NPF_NAT_PORTMAP) != 0) {
if ((np->n_flags & NPF_NAT_PORTMAP) != 0 && nt->nt_tport) {
if ((np->n_flags & NPF_NAT_PORTMAP) != 0 && nt->nt_tport) {
flags = !binat ? (NPF_NAT_PORTS | NPF_NAT_PORTMAP) : 0;
flags &= ~(NPF_NAT_PORTS | NPF_NAT_PORTMAP);
flags = (flags & ~NPF_NAT_PORTMAP) | NPF_NAT_PORTS;