Index: sys/netinet/tcp.h
===================================================================
--- sys/netinet/tcp.h
+++ sys/netinet/tcp.h
@@ -266,6 +266,7 @@
 #define	TCPI_OPT_WSCALE		0x04
 #define	TCPI_OPT_ECN		0x08
 #define	TCPI_OPT_TOE		0x10
+#define	TCPI_OPT_TFO		0x20
 
 /* Maximum length of log ID. */
 #define TCP_LOG_ID_LEN	64
Index: sys/netinet/tcp_usrreq.c
===================================================================
--- sys/netinet/tcp_usrreq.c
+++ sys/netinet/tcp_usrreq.c
@@ -1521,6 +1521,9 @@
 	if (tp->t_flags & TF_ECN_PERMIT)
 		ti->tcpi_options |= TCPI_OPT_ECN;
 
+        if (tp->t_flags & TF_FASTOPEN)
+		ti->tcpi_options |= TCPI_OPT_TFO;
+
 	ti->tcpi_rto = tp->t_rxtcur * tick;
 	ti->tcpi_last_data_recv = ((uint32_t)ticks - tp->t_rcvtime) * tick;
 	ti->tcpi_rtt = ((u_int64_t)tp->t_srtt * tick) >> TCP_RTT_SHIFT;