add_nat
int add_nat(u_int32_t, struct sockaddr *, struct sockaddr *, u_int16_t,
if (add_nat(s->id, client_sa, server_sa, s->port, proxy_sa,
if (add_nat(s->id, server_sa, client_sa, s->port,
if (add_nat(s->id, server_sa, client_sa, s->port,