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authorFlorian Westphal <fw@strlen.de>2010-06-03 00:43:44 +0000
committerDavid S. Miller <davem@davemloft.net>2010-06-05 02:23:14 -0700
commitaf9b4738574b46025de7ccbe75c7b24fd8914379 (patch)
tree6d05b82261ce76e6ecf00131c667292b62d16adf /net/ipv4
parent2a1d4bd46047efff513600d7ff422bc344f540a6 (diff)
downloadop-kernel-dev-af9b4738574b46025de7ccbe75c7b24fd8914379.zip
op-kernel-dev-af9b4738574b46025de7ccbe75c7b24fd8914379.tar.gz
syncookies: avoid unneeded tcp header flag double check
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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/syncookies.c2
-rw-r--r--net/ipv4/tcp_ipv4.c2
2 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 5c24db4..c9dac86 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -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) ||
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index a13f881..6558dfd 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -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;
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