is_un_nat_conn_valid(const struct conn *un_nat_conn)
{
    return un_nat_conn->conn_type == CT_CONN_TYPE_UN_NAT;
}
is_un_nat_conn_valid(const struct conn *un_nat_conn)
{
    return un_nat_conn->conn_type == CT_CONN_TYPE_UN_NAT;
}