Subject: [PATCH 12/14] Don't lookup the socket if there's a socket attached to the skb

From: KOVACS Krisztian <[email-masked]>
Date: Sat, 13 Oct 2007 19:35:09 +0200

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

Signed-off-by: KOVACS Krisztian <[email-masked]>
---

 net/ipv4/tcp_ipv4.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index fb471b0..90ee2ca 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1662,6 +1662,14 @@ int tcp_v4_rcv(struct sk_buff *skb)
 	TCP_SKB_CB(skb)->flags	 = iph->tos;
 	TCP_SKB_CB(skb)->sacked	 = 0;
 
+#if defined(CONFIG_NETFILTER_TPROXY) || defined(CONFIG_NETFILTER_TPROXY_MODULE)
+	if (unlikely(skb->sk)) {
+		/* steal reference */
+		sk = skb->sk;
+		skb->destructor = NULL;
+		skb->sk = NULL;
+	} else
+#endif
 	sk = __inet_lookup(&tcp_hashinfo, iph->saddr, th->source,
 			   iph->daddr, th->dest, inet_iif(skb));
 	if (!sk)