netdev - [PATCH] netfilter: don't do window scaling for a picked up connection

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Message-Id: <1333292683-31414-1-git-send-email-xiaosuo@gmail.com>
Date:	Sun,  1 Apr 2012 23:04:43 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Pablo Neira Ayuso <pablo@...filter.org>
Cc:	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	Changli Gao <xiaosuo@...il.com>
Subject: [PATCH] netfilter: don't do window scaling for a picked up connection

For a picked up connection, the window scaling option is also lost, because this
option is only valid in SYN or SYN/ACK segments. We should remove the useless
expression to save the CPU power.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
---
 net/netfilter/nf_conntrack_proto_tcp.c |    1 -
 1 file changed, 1 deletion(-)
diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c
index 361eade..22f0500 100644
--- a/net/netfilter/nf_conntrack_proto_tcp.c
+++ b/net/netfilter/nf_conntrack_proto_tcp.c
@@ -584,7 +584,6 @@ static bool tcp_in_window(const struct nf_conn *ct,
 			 * Let's try to use the data from the packet.
 			 */
 			sender->td_end = end;
-			win <<= sender->td_scale;
 			sender->td_maxwin = (win == 0 ? 1 : win);
 			sender->td_maxend = end + sender->td_maxwin;
 			/*
--
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