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[PATCH 13/14] Don't lookup the socket if there's a socket attached to the skb

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From: KOVACS Krisztian <hidden@...>
To: David Miller <davem@...>
Cc: Patrick McHardy <kaber@...>, <netdev@...>
Subject: [PATCH 13/14] Don't lookup the socket if there's a socket attached to the skb
Date: Saturday, October 13, 2007 - 1:35 pm

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 053d5c4..6592689 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1158,6 +1158,14 @@ 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_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 = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest,
 			       skb->dev->ifindex, udptable        );
 

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Messages in current thread:
[PATCH 00/14] Transparent Proxying Patches, Take 5, KOVACS Krisztian, (Sat Oct 13, 1:28 pm)
Re: [PATCH 00/14] Transparent Proxying Patches, Take 5, David Miller, (Sat Oct 13, 6:44 pm)
Re: [PATCH 00/14] Transparent Proxying Patches, Take 5, KOVACS Krisztian, (Sun Oct 14, 5:05 am)
[PATCH 08/14] Split Netfilter IPv4 defragmentation into a se..., KOVACS Krisztian, (Sat Oct 13, 1:33 pm)
[PATCH 07/14] Export UDP socket lookup function, KOVACS Krisztian, (Sat Oct 13, 1:32 pm)
[PATCH 09/14] iptables tproxy core, KOVACS Krisztian, (Sat Oct 13, 1:33 pm)
[PATCH 06/14] Port redirection support for TCP, KOVACS Krisztian, (Sat Oct 13, 1:32 pm)
[PATCH 04/14] Conditionally enable transparent flow flag whe..., KOVACS Krisztian, (Sat Oct 13, 1:31 pm)
[PATCH 05/14] Handle TCP SYN+ACK/ACK/RST transparency, KOVACS Krisztian, (Sat Oct 13, 1:31 pm)
[PATCH 03/14] Allow binding to non-local addresses if IP_TRA..., KOVACS Krisztian, (Sat Oct 13, 1:30 pm)
[PATCH 02/14] Implement IP_TRANSPARENT socket option, KOVACS Krisztian, (Sat Oct 13, 1:29 pm)
[PATCH 01/14] Loosen source address check on IPv4 output, KOVACS Krisztian, (Sat Oct 13, 1:29 pm)
[PATCH 14/14] Add documentation, KOVACS Krisztian, (Sat Oct 13, 1:36 pm)
[PATCH 13/14] Don't lookup the socket if there's a socket at..., KOVACS Krisztian, (Sat Oct 13, 1:35 pm)
[PATCH 12/14] Don't lookup the socket if there's a socket at..., KOVACS Krisztian, (Sat Oct 13, 1:35 pm)
[PATCH 11/14] iptables TPROXY target, KOVACS Krisztian, (Sat Oct 13, 1:34 pm)
[PATCH 10/14] iptables socket match, KOVACS Krisztian, (Sat Oct 13, 1:34 pm)