Index: head/sys/netinet/tcp_usrreq.c
===================================================================
--- head/sys/netinet/tcp_usrreq.c
+++ head/sys/netinet/tcp_usrreq.c
@@ -133,6 +133,8 @@
 static void	tcp_usrclosed(struct tcpcb *);
 static void	tcp_fill_info(struct tcpcb *, struct tcp_info *);
 
+static int	tcp_pru_options_support(struct tcpcb *tp, int flags);
+
 #ifdef TCPDEBUG
 #define	TCPDEBUG0	int ostate = 0
 #define	TCPDEBUG1()	ostate = tp ? tp->t_state : 0
@@ -979,6 +981,15 @@
 		goto out;
 	}
 	tp = intotcpcb(inp);
+	if (flags & PRUS_OOB) {
+		if ((error = tcp_pru_options_support(tp, PRUS_OOB)) != 0) {
+			if (control)
+				m_freem(control);
+			if (m && (flags & PRUS_NOTREADY) == 0)
+				m_freem(m);
+			goto out;
+		}
+	}
 	TCPDEBUG1();
 	if (nam != NULL && tp->t_state < TCPS_SYN_SENT) {
 		switch (nam->sa_family) {
@@ -1362,6 +1373,24 @@
 	NET_EPOCH_EXIT(et);
 }
 
+static int 
+tcp_pru_options_support(struct tcpcb *tp, int flags)
+{
+	/*
+	 * If the specific TCP stack has a pru_options
+	 * specified then it does not always support
+	 * all the PRU_XX options and we must ask it.
+	 * If the function is not specified then all
+	 * of the PRU_XX options are supported.
+	 */
+	int ret = 0;
+
+	if (tp->t_fb->tfb_pru_options) {
+		ret = (*tp->t_fb->tfb_pru_options)(tp, flags);
+	}
+	return (ret);
+}
+
 /*
  * Receive out-of-band data.
  */
@@ -1381,6 +1410,10 @@
 		goto out;
 	}
 	tp = intotcpcb(inp);
+	error = tcp_pru_options_support(tp, PRUS_OOB);
+	if (error) {
+		goto out;
+	}
 	TCPDEBUG1();
 	if ((so->so_oobmark == 0 &&
 	     (so->so_rcv.sb_state & SBS_RCVATMARK) == 0) ||
Index: head/sys/netinet/tcp_var.h
===================================================================
--- head/sys/netinet/tcp_var.h
+++ head/sys/netinet/tcp_var.h
@@ -345,6 +345,7 @@
 	void	(*tfb_tcp_rexmit_tmr)(struct tcpcb *);
 	int	(*tfb_tcp_handoff_ok)(struct tcpcb *);
 	void	(*tfb_tcp_mtu_chg)(struct tcpcb *);
+	int	(*tfb_pru_options)(struct tcpcb *, int);
 	volatile uint32_t tfb_refcnt;
 	uint32_t  tfb_flags;
 	uint8_t	tfb_id;