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syncookies: only increment SYNCOOKIESFAILED on validation error

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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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2014-10-30 02:55:38 +01:00 committed by David S. Miller
parent f5fbf11569
commit 646697b9e3
2 changed files with 10 additions and 4 deletions
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7
net/ipv4/syncookies.c
View File

@ -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;
}

7
net/ipv6/syncookies.c
View File

@ -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;
}