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net/tcp_fastopen: Add snmp counter for blackhole detection

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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>
This commit is contained in:
Wei Wang
2017-04-20 14:45:47 -07:00
committed by David S. Miller
parent cf1ef3f071
commit 46c2fa3987
5 changed files with 8 additions and 5 deletions
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4
net/ipv4/tcp_input.c
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@@ -5307,7 +5307,7 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
*/
if (tp->syn_fastopen && !tp->data_segs_in &&
sk->sk_state == TCP_ESTABLISHED)
tcp_fastopen_active_disable();
tcp_fastopen_active_disable(sk);
tcp_send_challenge_ack(sk, skb);
}
goto discard;
@@ -6061,7 +6061,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
after(TCP_SKB_CB(skb)->end_seq - th->fin, tp->rcv_nxt)) {
/* Receive out of order FIN after close() */
if (tp->syn_fastopen && th->fin)
tcp_fastopen_active_disable();
tcp_fastopen_active_disable(sk);
tcp_done(sk);
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA);
return 1;