{
      if (port == 0) {
            port = generate_local_port(); 
            sk->s_flags &= ~NL_OWN_PORT;
      } else  {
            if (!(sk->s_flags & NL_OWN_PORT))
                  release_local_port(sk->s_local.nl_pid);
            sk->s_flags |= NL_OWN_PORT;
      }

      sk->s_local.nl_pid = port;
}