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authorWei Wang <weiwan@google.com>2017-04-21 00:45:47 +0300
committerDavid S. Miller <davem@davemloft.net>2017-04-24 21:27:17 +0300
commit46c2fa39877ed70415ee2b1acfb9129e956f6de4 (patch)
treea10691f0b2436b49fb8c172ea4be7b16693aa934 /net/ipv4/tcp_fastopen.c
parentcf1ef3f0719b4dcb74810ed507e2a2540f9811b4 (diff)
downloadlinux-46c2fa39877ed70415ee2b1acfb9129e956f6de4.tar.xz
net/tcp_fastopen: Add snmp counter for blackhole detection
This counter records the number of times the firewall blackhole issue is detected and active TFO is disabled. Signed-off-by: Wei Wang <weiwan@google.com> Acked-by: Yuchung Cheng <ycheng@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_fastopen.c')
-rw-r--r--net/ipv4/tcp_fastopen.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c
index ff2d30ffc6f3..4af82b914dd4 100644
--- a/net/ipv4/tcp_fastopen.c
+++ b/net/ipv4/tcp_fastopen.c
@@ -410,10 +410,11 @@ static unsigned long tfo_active_disable_stamp __read_mostly;
/* Disable active TFO and record current jiffies and
* tfo_active_disable_times
*/
-void tcp_fastopen_active_disable(void)
+void tcp_fastopen_active_disable(struct sock *sk)
{
atomic_inc(&tfo_active_disable_times);
tfo_active_disable_stamp = jiffies;
+ NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENBLACKHOLE);
}
/* Reset tfo_active_disable_times to 0 */
@@ -469,7 +470,7 @@ void tcp_fastopen_active_disable_ofo_check(struct sock *sk)
if (p && !rb_next(p)) {
skb = rb_entry(p, struct sk_buff, rbnode);
if (TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN) {
- tcp_fastopen_active_disable();
+ tcp_fastopen_active_disable(sk);
return;
}
}