inet: Don't lookup the socket if there's a socket attached to the skb

Use the socket cached in the skb if it's present.

Signed-off-by: KOVACS Krisztian <hidden@sch.bme.hu>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 3 deletions

diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index 3522bbcd546d..5cc182f9ecae 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -378,11 +378,15 @@ static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
                                              const __be16 sport,
                                              const __be16 dport)
 {
+        struct sock *sk;
         const struct iphdr *iph = ip_hdr(skb);
 
-        return __inet_lookup(dev_net(skb->dst->dev), hashinfo,
-                             iph->saddr, sport,
-                             iph->daddr, dport, inet_iif(skb));
+        if (unlikely(sk = skb_steal_sock(skb)))
+                return sk;
+        else
+                return __inet_lookup(dev_net(skb->dst->dev), hashinfo,
+                                     iph->saddr, sport,
+                                     iph->daddr, dport, inet_iif(skb));
 }
 
 extern int __inet_hash_connect(struct inet_timewait_death_row *death_row,