From: Florian Westphal <fw@strlen.de>
To: <netdev@vger.kernel.org>
Cc: Florian Westphal <fw@strlen.de>
Subject: [PATCH net-next-2.6] syncookies: avoid unneeded tcp header flag double check
Date: Thu, 3 Jun 2010 12:43:44 +0200 [thread overview]
Message-ID: <1275561824-24227-1-git-send-email-fw@strlen.de> (raw)
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>
---
net/ipv4/syncookies.c | 2 +-
net/ipv4/tcp_ipv4.c | 2 +-
net/ipv6/syncookies.c | 2 +-
net/ipv6/tcp_ipv6.c | 2 +-
4 files changed, 4 insertions(+), 4 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;
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index 1238370..9fcb3ec 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -174,7 +174,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
struct dst_entry *dst;
__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/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index e487080..5887141 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1157,7 +1157,7 @@ static struct sock *tcp_v6_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_v6_check(sk, skb);
#endif
return sk;
--
1.6.4.4
next reply other threads:[~2010-06-03 10:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-03 10:43 Florian Westphal [this message]
2010-06-05 9:53 ` [PATCH net-next-2.6] syncookies: avoid unneeded tcp header flag double check David Miller
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