Index: sys/net/if.c
===================================================================
--- sys/net/if.c
+++ sys/net/if.c
@@ -1090,10 +1090,9 @@
  	struct ifnet *iter;
  	int found = 0;
 #ifdef VIMAGE
-	int shutdown;
+	bool shutdown;
 
-	shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET &&
-		 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0;
+	shutdown = !vnet_is_ready(ifp->if_vnet);
 #endif
 	IFNET_WLOCK();
 	CK_STAILQ_FOREACH(iter, &V_ifnet, if_link)
@@ -1334,7 +1333,7 @@
 {
 	struct prison *pr;
 	struct ifnet *difp;
-	int shutdown;
+	bool shutdown;
 
 	/* Try to find the prison within our visibility. */
 	sx_slock(&allprison_lock);
@@ -1362,8 +1361,7 @@
 	}
 
 	/* Make sure the VNET is stable. */
-	shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET &&
-		 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0;
+	shutdown = !vnet_is_ready(ifp->if_vnet);
 	if (shutdown) {
 		CURVNET_RESTORE();
 		prison_free(pr);
@@ -1387,7 +1385,7 @@
 	struct prison *pr;
 	struct vnet *vnet_dst;
 	struct ifnet *ifp;
- 	int shutdown;
+ 	bool shutdown;
 
 	/* Try to find the prison within our visibility. */
 	sx_slock(&allprison_lock);
@@ -1416,8 +1414,7 @@
 	}
 
 	/* Make sure the VNET is stable. */
-	shutdown = (ifp->if_vnet->vnet_state > SI_SUB_VNET &&
-		 ifp->if_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0;
+	shutdown = !vnet_is_ready(ifp->if_vnet);
 	if (shutdown) {
 		CURVNET_RESTORE();
 		prison_free(pr);
@@ -3009,14 +3006,13 @@
 	int error;
 	int oif_flags;
 #ifdef VIMAGE
-	int shutdown;
+	bool shutdown;
 #endif
 
 	CURVNET_SET(so->so_vnet);
 #ifdef VIMAGE
 	/* Make sure the VNET is stable. */
-	shutdown = (so->so_vnet->vnet_state > SI_SUB_VNET &&
-		 so->so_vnet->vnet_state < SI_SUB_VNET_DONE) ? 1 : 0;
+	shutdown = !vnet_is_ready(so->so_vnet);
 	if (shutdown) {
 		CURVNET_RESTORE();
 		return (EBUSY);
Index: sys/net/vnet.h
===================================================================
--- sys/net/vnet.h
+++ sys/net/vnet.h
@@ -349,6 +349,11 @@
 	    vnet_deregister_sysuninit, &ident ## _vnet_uninit)
 
 /*
+ * Check if VNET is ready.
+ */
+bool	vnet_is_ready(struct vnet *);
+
+/*
  * Run per-vnet sysinits or sysuninits during vnet creation/destruction.
  */
 void	 vnet_sysinit(void);
Index: sys/net/vnet.c
===================================================================
--- sys/net/vnet.c
+++ sys/net/vnet.c
@@ -225,6 +225,17 @@
 #endif
 
 /*
+ * Check if VNET is in startup or shutdown phase.
+ */
+bool
+vnet_is_ready(struct vnet *vnet)
+{
+
+	return (vnet->vnet_state <= SI_SUB_VNET ||
+	    vnet->vnet_state >= SI_SUB_VNET_DONE);
+}
+
+/*
  * Allocate a virtual network stack.
  */
 struct vnet *