[PATCH 13/13] Don't lookup the socket if there's a socket attached to the skb

[KOVACS Krisztian <hidden@sch.bme.hu>]

Use the socket cached in the TPROXY target if it's present.

Signed-off-by: KOVACS Krisztian <hidden@sch.bme.hu>
---

 net/ipv4/udp.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 2fb3b7c..2bdf034 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1151,6 +1151,14 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
 	if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
 		return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
 
+#if defined(CONFIG_IP_NF_TPROXY) || defined (CONFIG_IP_NF_TPROXY_MODULE)
+	if (unlikely(skb->sk)) {
+		/* steal reference */
+		sk = skb->sk;
+		skb->destructor = NULL;
+		skb->sk = NULL;
+	} else
+#endif
 	sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest,
 			       skb->dev->ifindex, udptable        );