flowi4_update_output
flowi4_update_output(fl4, oif, fl4->daddr, fl4->saddr);
flowi4_update_output(fl4, sk->sk_bound_dev_if, fl4->daddr,
flowi4_update_output(&fl4, 0, daddr, fl4.saddr);
flowi4_update_output(fl4, asoc->base.sk->sk_bound_dev_if,