diff --git a/include/uapi/linux/inet_diag.h b/include/uapi/linux/inet_diag.h
index 86bb2e8b17c9..21f0d735fbae 100644
--- a/include/uapi/linux/inet_diag.h
+++ b/include/uapi/linux/inet_diag.h
@@ -129,6 +129,15 @@ struct inet_diag_msg {
 	__u32	idiag_inode;
 };
 
+enum {
+	IDIAG_TIMER_OFF,
+	IDIAG_TIMER_ON,
+	IDIAG_TIMER_KEEPALIVE,
+	IDIAG_TIMER_TIMEWAIT,
+	IDIAG_TIMER_PROBE0,
+	IDIAG_TIMER_DELACK,
+};
+
 /* Extensions */
 
 enum {
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 9d215485b5c7..34b77aa87d0a 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -241,7 +241,7 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 
 	inet_diag_msg_common_fill(r, sk);
 	r->idiag_state = sk->sk_state;
-	r->idiag_timer = 0;
+	r->idiag_timer = IDIAG_TIMER_OFF;
 	r->idiag_retrans = 0;
 	r->idiag_expires = 0;
 
@@ -284,20 +284,25 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
 	if (icsk_pending == ICSK_TIME_RETRANS ||
 	    icsk_pending == ICSK_TIME_REO_TIMEOUT ||
 	    icsk_pending == ICSK_TIME_LOSS_PROBE) {
-		r->idiag_timer = 1;
+		r->idiag_timer = IDIAG_TIMER_ON;
 		r->idiag_retrans = READ_ONCE(icsk->icsk_retransmits);
 		r->idiag_expires =
 			jiffies_delta_to_msecs(tcp_timeout_expires(sk) - jiffies);
 	} else if (icsk_pending == ICSK_TIME_PROBE0) {
-		r->idiag_timer = 4;
+		r->idiag_timer = IDIAG_TIMER_PROBE0;
 		r->idiag_retrans = READ_ONCE(icsk->icsk_probes_out);
 		r->idiag_expires =
 			jiffies_delta_to_msecs(tcp_timeout_expires(sk) - jiffies);
 	} else if (timer_pending(&icsk->icsk_keepalive_timer)) {
-		r->idiag_timer = 2;
+		r->idiag_timer = IDIAG_TIMER_KEEPALIVE;
 		r->idiag_retrans = READ_ONCE(icsk->icsk_probes_out);
 		r->idiag_expires =
 			jiffies_delta_to_msecs(icsk->icsk_keepalive_timer.expires - jiffies);
+	} else if ((READ_ONCE(icsk->icsk_ack.pending) & ICSK_ACK_TIMER) &&
+		   timer_pending(&icsk->icsk_delack_timer)) {
+		r->idiag_timer = IDIAG_TIMER_DELACK;
+		r->idiag_expires =
+			jiffies_delta_to_msecs(icsk_delack_timeout(icsk) - jiffies);
 	}
 
 	if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 7935702e394b..ba1fdbe9807f 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -212,7 +212,7 @@ static int tcp_twsk_diag_fill(struct sock *sk,
 	r->idiag_retrans      = 0;
 
 	r->idiag_state	      = READ_ONCE(tw->tw_substate);
-	r->idiag_timer	      = 3;
+	r->idiag_timer	      = IDIAG_TIMER_TIMEWAIT;
 	tmo = tw->tw_timer.expires - jiffies;
 	r->idiag_expires      = jiffies_delta_to_msecs(tmo);
 	r->idiag_rqueue	      = 0;
@@ -247,7 +247,7 @@ static int tcp_req_diag_fill(struct sock *sk, struct sk_buff *skb,
 	r = nlmsg_data(nlh);
 	inet_diag_msg_common_fill(r, sk);
 	r->idiag_state = TCP_SYN_RECV;
-	r->idiag_timer = 1;
+	r->idiag_timer = IDIAG_TIMER_ON;
 	r->idiag_retrans = READ_ONCE(reqsk->num_retrans);
 
 	BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=