From: Florian Westphal <fw@strlen.de>
To: netdev@vger.kernel.org
Cc: Florian Westphal <fw@strlen.de>
Subject: [PATCH -next] syncookies: only increment SYNCOOKIESFAILED on validation error
Date: Thu, 30 Oct 2014 02:55:38 +0100 [thread overview]
Message-ID: <1414634138-23238-1-git-send-email-fw@strlen.de> (raw)
Only count packets that failed cookie-authentication.
We can get SYNCOOKIESFAILED > 0 while we never even sent a single cookie.
Signed-off-by: Florian Westphal <fw@strlen.de>
---
net/ipv4/syncookies.c | 7 +++++--
net/ipv6/syncookies.c | 7 +++++--
2 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 32b98d0..4ac7bca 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -275,8 +275,11 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
if (!sysctl_tcp_syncookies || !th->ack || th->rst)
goto out;
- if (tcp_synq_no_recent_overflow(sk) ||
- (mss = __cookie_v4_check(ip_hdr(skb), th, cookie)) == 0) {
+ if (tcp_synq_no_recent_overflow(sk))
+ goto out;
+
+ mss = __cookie_v4_check(ip_hdr(skb), th, cookie);
+ if (mss == 0) {
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_SYNCOOKIESFAILED);
goto out;
}
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index 0e26e79..be291ba 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -171,8 +171,11 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
if (!sysctl_tcp_syncookies || !th->ack || th->rst)
goto out;
- if (tcp_synq_no_recent_overflow(sk) ||
- (mss = __cookie_v6_check(ipv6_hdr(skb), th, cookie)) == 0) {
+ if (tcp_synq_no_recent_overflow(sk))
+ goto out;
+
+ mss = __cookie_v6_check(ipv6_hdr(skb), th, cookie);
+ if (mss == 0) {
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_SYNCOOKIESFAILED);
goto out;
}
--
2.0.4
next reply other threads:[~2014-10-30 1:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-30 1:55 Florian Westphal [this message]
2014-10-30 20:54 ` [PATCH -next] syncookies: only increment SYNCOOKIESFAILED on validation error David Miller
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