+ if (sk->sk_rx_dst) {
+ struct dst_entry *dst = sk->sk_rx_dst;
+ if (unlikely(dst->obsolete)) {
+ if (dst->ops->check(dst, 0) == NULL) {
+ dst_release(dst);
+ sk->sk_rx_dst = NULL;
+ }
+ }
+ }
+ if (unlikely(sk->sk_rx_dst == NULL))
+ sk->sk_rx_dst = dst_clone(skb_dst(skb));
+