Subject: [net-next PATCH 10/16] Don't lookup the socket if there's a socket attached to the skb

From: KOVACS Krisztian <[email-masked]>
Date: Wed, 01 Oct 2008 16:24:31 +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 |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1ac4d05..0029db9 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1577,8 +1577,17 @@ 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(net, &tcp_hashinfo, iph->saddr,
 			th->source, iph->daddr, th->dest, inet_iif(skb));
+
 	if (!sk)
 		goto no_tcp_socket;