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syncookies: avoid unneeded tcp header flag double check

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caller: if (!th->rst && !th->syn && th->ack)
callee: if (!th->ack)

make the caller only check for !syn (common for 3whs), and move
the !rst / ack test to the callee.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal
2010-06-03 00:43:44 +00:00
committed by David S. Miller
parent 2a1d4bd460
commit af9b473857
4 changed files with 4 additions and 4 deletions
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2
net/ipv4/syncookies.c
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@@ -266,7 +266,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
struct rtable *rt;
__u8 rcv_wscale;
if (!sysctl_tcp_syncookies || !th->ack)
if (!sysctl_tcp_syncookies || !th->ack || th->rst)
goto out;
if (tcp_synq_no_recent_overflow(sk) ||