diff --git a/sys/netinet/tcp.h b/sys/netinet/tcp.h
--- a/sys/netinet/tcp.h
+++ b/sys/netinet/tcp.h
@@ -348,6 +348,8 @@
 	u_int8_t	tcpi_options;		/* Options enabled on conn. */
 	u_int8_t	tcpi_snd_wscale:4,	/* RFC1323 send shift value. */
 			tcpi_rcv_wscale:4;	/* RFC1323 recv shift value. */
+	u_int8_t	__tcpi_delivery_rate_app_limited:1,
+			__tcpi_fastopen_client_fail:2;
 
 	u_int32_t	tcpi_rto;		/* Retransmission timeout (usec). */
 	u_int32_t	__tcpi_ato;
@@ -389,8 +391,17 @@
 	u_int32_t	tcpi_rcv_ooopack;	/* Out-of-order packets */
 	u_int32_t	tcpi_snd_zerowin;	/* Zero-sized windows sent */
 
+	/* Accurate ECN counters. */
+	u_int32_t	__tcpi_received_ce;		/* # of CE marks received */
+	u_int32_t	__tcpi_delivered_e1_bytes;
+	u_int32_t	__tcpi_delivered_e0_bytes;
+	u_int32_t	__tcpi_delivered_ce_bytes;
+	u_int32_t	__tcpi_received_e1_bytes;
+	u_int32_t	__tcpi_received_e0_bytes;
+	u_int32_t	__tcpi_received_ce_bytes;
+
 	/* Padding to grow without breaking ABI. */
-	u_int32_t	__tcpi_pad[26];		/* Padding. */
+	u_int32_t	__tcpi_pad[19];		/* Padding. */
 };
 
 /*