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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
commit af9b473857
4 changed files with 4 additions and 4 deletions
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2
net/ipv4/tcp_ipv4.c
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@ -1506,7 +1506,7 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
}
#ifdef CONFIG_SYN_COOKIES
if (!th->rst && !th->syn && th->ack)
if (!th->syn)
sk = cookie_v4_check(sk, skb, &(IPCB(skb)->opt));
#endif
return sk;