diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index b1c6500e7a8df4d7377b291e9afc09363e66cd17..974ab47ae53a81c27b2b57533db813288139fd7b 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -602,6 +602,14 @@ tcp_fastopen - INTEGER
 	Note that that additional client or server features are only
 	effective if the basic support (0x1 and 0x2) are enabled respectively.
 
+tcp_fastopen_blackhole_timeout_sec - INTEGER
+	Initial time period in second to disable Fastopen on active TCP sockets
+	when a TFO firewall blackhole issue happens.
+	This time period will grow exponentially when more blackhole issues
+	get detected right after Fastopen is re-enabled and will reset to
+	initial value when the blackhole issue goes away.
+	By default, it is set to 1hr.
+
 tcp_syn_retries - INTEGER
 	Number of times initial SYNs for an active TCP connection attempt
 	will be retransmitted. Should not be higher than 127. Default value
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index cfc2d9506ce8077af1ec92eb7086fd52ce4fe1ac..cbe5b602a2d349fdeb1e878305f37b4da1e6cc86 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -233,6 +233,7 @@ struct tcp_sock {
 	u8	syn_data:1,	/* SYN includes data */
 		syn_fastopen:1,	/* SYN includes Fast Open option */
 		syn_fastopen_exp:1,/* SYN includes Fast Open exp. option */
+		syn_fastopen_ch:1, /* Active TFO re-enabling probe */
 		syn_data_acked:1,/* data in SYN is acked by SYN-ACK */
 		save_syn:1,	/* Save headers of SYN packet */
 		is_cwnd_limited:1;/* forward progress limited by snd_cwnd? */
diff --git a/include/net/tcp.h b/include/net/tcp.h
index cc6ae0a95201f0adc52c2c46b429566806da6745..da28bef1d82b6773bbfcf7c7eafebb7a4932f25b 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1506,6 +1506,12 @@ struct tcp_fastopen_context {
 	struct rcu_head		rcu;
 };
 
+extern unsigned int sysctl_tcp_fastopen_blackhole_timeout;
+void tcp_fastopen_active_disable(struct sock *sk);
+bool tcp_fastopen_active_should_disable(struct sock *sk);
+void tcp_fastopen_active_disable_ofo_check(struct sock *sk);
+void tcp_fastopen_active_timeout_reset(void);
+
 /* Latencies incurred by various limits for a sender. They are
  * chronograph-like stats that are mutually exclusive.
  */
diff --git a/include/uapi/linux/snmp.h b/include/uapi/linux/snmp.h
index cec0e171d20caea2f188c06a9924f886b0daaa85..95cffcb21dfdba7c974706131d0f43e21435e82d 100644
--- a/include/uapi/linux/snmp.h
+++ b/include/uapi/linux/snmp.h
@@ -259,6 +259,7 @@ enum
 	LINUX_MIB_TCPFASTOPENPASSIVEFAIL,	/* TCPFastOpenPassiveFail */
 	LINUX_MIB_TCPFASTOPENLISTENOVERFLOW,	/* TCPFastOpenListenOverflow */
 	LINUX_MIB_TCPFASTOPENCOOKIEREQD,	/* TCPFastOpenCookieReqd */
+	LINUX_MIB_TCPFASTOPENBLACKHOLE,		/* TCPFastOpenBlackholeDetect */
 	LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES, /* TCPSpuriousRtxHostQueues */
 	LINUX_MIB_BUSYPOLLRXPACKETS,		/* BusyPollRxPackets */
 	LINUX_MIB_TCPAUTOCORKING,		/* TCPAutoCorking */
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 4ccbf464d1acf5f433dd2a0768691f5d22e3033d..fa44e752a9a3f8eb9957314149ae15e6df10465a 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -281,6 +281,7 @@ static const struct snmp_mib snmp4_net_list[] = {
 	SNMP_MIB_ITEM("TCPFastOpenPassiveFail", LINUX_MIB_TCPFASTOPENPASSIVEFAIL),
 	SNMP_MIB_ITEM("TCPFastOpenListenOverflow", LINUX_MIB_TCPFASTOPENLISTENOVERFLOW),
 	SNMP_MIB_ITEM("TCPFastOpenCookieReqd", LINUX_MIB_TCPFASTOPENCOOKIEREQD),
+	SNMP_MIB_ITEM("TCPFastOpenBlackhole", LINUX_MIB_TCPFASTOPENBLACKHOLE),
 	SNMP_MIB_ITEM("TCPSpuriousRtxHostQueues", LINUX_MIB_TCPSPURIOUS_RTX_HOSTQUEUES),
 	SNMP_MIB_ITEM("BusyPollRxPackets", LINUX_MIB_BUSYPOLLRXPACKETS),
 	SNMP_MIB_ITEM("TCPAutoCorking", LINUX_MIB_TCPAUTOCORKING),
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index ddac9e64b7022452202cdb0697cbfee82ed1727b..86957e9cd6c6748ac00aa0307154bb131c43f1da 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -350,6 +350,19 @@ static int proc_udp_early_demux(struct ctl_table *table, int write,
 	return ret;
 }
 
+static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
+					     int write,
+					     void __user *buffer,
+					     size_t *lenp, loff_t *ppos)
+{
+	int ret;
+
+	ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
+	if (write && ret == 0)
+		tcp_fastopen_active_timeout_reset();
+	return ret;
+}
+
 static struct ctl_table ipv4_table[] = {
 	{
 		.procname	= "tcp_timestamps",
@@ -399,6 +412,14 @@ static struct ctl_table ipv4_table[] = {
 		.maxlen		= ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
 		.proc_handler	= proc_tcp_fastopen_key,
 	},
+	{
+		.procname	= "tcp_fastopen_blackhole_timeout_sec",
+		.data		= &sysctl_tcp_fastopen_blackhole_timeout,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_tfo_blackhole_detect_timeout,
+		.extra1		= &zero,
+	},
 	{
 		.procname	= "tcp_abort_on_overflow",
 		.data		= &sysctl_tcp_abort_on_overflow,
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 04843ae77b9ecacb3e4f2e81096f11d35ae1915e..efc976ae66ae5b82d496323634c3030fb71c6c92 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2296,6 +2296,7 @@ int tcp_disconnect(struct sock *sk, int flags)
 	tcp_clear_xmit_timers(sk);
 	__skb_queue_purge(&sk->sk_receive_queue);
 	tcp_write_queue_purge(sk);
+	tcp_fastopen_active_disable_ofo_check(sk);
 	skb_rbtree_purge(&tp->out_of_order_queue);
 
 	inet->inet_dport = 0;
diff --git a/net/ipv4/tcp_fastopen.c b/net/ipv4/tcp_fastopen.c
index 8ea4e9787f82ba65cd07b4c2b663df76fe4eb143..4af82b914dd4bbdc47e37cf1cf70f206bd186db5 100644
--- a/net/ipv4/tcp_fastopen.c
+++ b/net/ipv4/tcp_fastopen.c
@@ -341,6 +341,13 @@ bool tcp_fastopen_cookie_check(struct sock *sk, u16 *mss,
 		cookie->len = -1;
 		return false;
 	}
+
+	/* Firewall blackhole issue check */
+	if (tcp_fastopen_active_should_disable(sk)) {
+		cookie->len = -1;
+		return false;
+	}
+
 	if (sysctl_tcp_fastopen & TFO_CLIENT_NO_COOKIE) {
 		cookie->len = -1;
 		return true;
@@ -380,3 +387,98 @@ bool tcp_fastopen_defer_connect(struct sock *sk, int *err)
 	return false;
 }
 EXPORT_SYMBOL(tcp_fastopen_defer_connect);
+
+/*
+ * The following code block is to deal with middle box issues with TFO:
+ * Middlebox firewall issues can potentially cause server's data being
+ * blackholed after a successful 3WHS using TFO.
+ * The proposed solution is to disable active TFO globally under the
+ * following circumstances:
+ *   1. client side TFO socket receives out of order FIN
+ *   2. client side TFO socket receives out of order RST
+ * We disable active side TFO globally for 1hr at first. Then if it
+ * happens again, we disable it for 2h, then 4h, 8h, ...
+ * And we reset the timeout back to 1hr when we see a successful active
+ * TFO connection with data exchanges.
+ */
+
+/* Default to 1hr */
+unsigned int sysctl_tcp_fastopen_blackhole_timeout __read_mostly = 60 * 60;
+static atomic_t tfo_active_disable_times __read_mostly = ATOMIC_INIT(0);
+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(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 */
+void tcp_fastopen_active_timeout_reset(void)
+{
+	atomic_set(&tfo_active_disable_times, 0);
+}
+
+/* Calculate timeout for tfo active disable
+ * Return true if we are still in the active TFO disable period
+ * Return false if timeout already expired and we should use active TFO
+ */
+bool tcp_fastopen_active_should_disable(struct sock *sk)
+{
+	int tfo_da_times = atomic_read(&tfo_active_disable_times);
+	int multiplier;
+	unsigned long timeout;
+
+	if (!tfo_da_times)
+		return false;
+
+	/* Limit timout to max: 2^6 * initial timeout */
+	multiplier = 1 << min(tfo_da_times - 1, 6);
+	timeout = multiplier * sysctl_tcp_fastopen_blackhole_timeout * HZ;
+	if (time_before(jiffies, tfo_active_disable_stamp + timeout))
+		return true;
+
+	/* Mark check bit so we can check for successful active TFO
+	 * condition and reset tfo_active_disable_times
+	 */
+	tcp_sk(sk)->syn_fastopen_ch = 1;
+	return false;
+}
+
+/* Disable active TFO if FIN is the only packet in the ofo queue
+ * and no data is received.
+ * Also check if we can reset tfo_active_disable_times if data is
+ * received successfully on a marked active TFO sockets opened on
+ * a non-loopback interface
+ */
+void tcp_fastopen_active_disable_ofo_check(struct sock *sk)
+{
+	struct tcp_sock *tp = tcp_sk(sk);
+	struct rb_node *p;
+	struct sk_buff *skb;
+	struct dst_entry *dst;
+
+	if (!tp->syn_fastopen)
+		return;
+
+	if (!tp->data_segs_in) {
+		p = rb_first(&tp->out_of_order_queue);
+		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(sk);
+				return;
+			}
+		}
+	} else if (tp->syn_fastopen_ch &&
+		   atomic_read(&tfo_active_disable_times)) {
+		dst = sk_dst_get(sk);
+		if (!(dst && dst->dev && (dst->dev->flags & IFF_LOOPBACK)))
+			tcp_fastopen_active_timeout_reset();
+		dst_release(dst);
+	}
+}
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 341f021f02a2931cd75b2e1e71af9729fc4c7895..5af2f04f885914491a7116c20056b3d2188d2d7d 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5300,8 +5300,16 @@ static bool tcp_validate_incoming(struct sock *sk, struct sk_buff *skb,
 
 		if (rst_seq_match)
 			tcp_reset(sk);
-		else
+		else {
+			/* Disable TFO if RST is out-of-order
+			 * and no data has been received
+			 * for current active TFO socket
+			 */
+			if (tp->syn_fastopen && !tp->data_segs_in &&
+			    sk->sk_state == TCP_ESTABLISHED)
+				tcp_fastopen_active_disable(sk);
 			tcp_send_challenge_ack(sk, skb);
+		}
 		goto discard;
 	}
 
@@ -6044,9 +6052,16 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
 			break;
 		}
 
-		if (tp->linger2 < 0 ||
-		    (TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq &&
-		     after(TCP_SKB_CB(skb)->end_seq - th->fin, tp->rcv_nxt))) {
+		if (tp->linger2 < 0) {
+			tcp_done(sk);
+			NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA);
+			return 1;
+		}
+		if (TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq &&
+		    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(sk);
 			tcp_done(sk);
 			NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA);
 			return 1;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 20cbd2f07f281717c1cb4e901c4c4e22f7c46bd6..cbbafe546c0f5c5f43531eaf24f5b460264785c6 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1855,6 +1855,9 @@ void tcp_v4_destroy_sock(struct sock *sk)
 	/* Cleanup up the write buffer. */
 	tcp_write_queue_purge(sk);
 
+	/* Check if we want to disable active TFO */
+	tcp_fastopen_active_disable_ofo_check(sk);
+
 	/* Cleans up our, hopefully empty, out_of_order_queue. */
 	skb_rbtree_purge(&tp->out_of_order_queue);
 
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index b2ab411c6d3728fa7dbdebde045532a7317f5166..14672543cf0bd27bc59976d5cec38d2d3bbcdd2c 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -201,11 +201,10 @@ static int tcp_write_timeout(struct sock *sk)
 		if (retransmits_timed_out(sk, net->ipv4.sysctl_tcp_retries1, 0, 0)) {
 			/* Some middle-boxes may black-hole Fast Open _after_
 			 * the handshake. Therefore we conservatively disable
-			 * Fast Open on this path on recurring timeouts with
-			 * few or zero bytes acked after Fast Open.
+			 * Fast Open on this path on recurring timeouts after
+			 * successful Fast Open.
 			 */
-			if (tp->syn_data_acked &&
-			    tp->bytes_acked <= tp->rx_opt.mss_clamp) {
+			if (tp->syn_data_acked) {
 				tcp_fastopen_cache_set(sk, 0, NULL, true, 0);
 				if (icsk->icsk_retransmits == net->ipv4.sysctl_tcp_retries1)
 					NET_INC_STATS(sock_net(sk),