auth_validate
int auth_validate(void *buf, u_int16_t len, struct iface *,
if (auth_validate(buf, len, iface, nbr)) {
if (auth_validate(&buf, &len, iface, nbr, nbr_failed,
int auth_validate(u_int8_t **, u_int16_t *, struct iface *, struct nbr *,