UDP input code path looks up the UDP socket hash tables to find a
socket matching the incoming packet. However, as iptable_tproxy does
socket lookups early the skb may already have the appropriate
reference attached, in that case we steal that reference instead of
doing the lookup.
Signed-off-by: KOVACS Krisztian <[EMAIL PROTECTED]>
---
net/ipv4/udp.c | 11 +++++++++--
1 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index cfff930..1b348f5 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1225,8 +1225,15 @@ int __udp4_lib_rcv(struct sk_buff *skb,
if(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr,
udptable);
- sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest,
- skb->dev->ifindex, udptable );
+ if (skb->sk) {
+ /* steal reference */
+ sk = skb->sk;
+ skb->destructor = NULL;
+ skb->sk = NULL;
+ } else {
+ sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest,
+ skb->dev->ifindex, udptable );
+ }
if (sk != NULL) {
int ret = udp_queue_rcv_skb(sk, skb);
-
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