diff --git a/sys/net/if.c b/sys/net/if.c
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -4600,6 +4600,42 @@
 	return (error);
 }
 
+
+/*
+ * Uses just 2 pointers of the 4 available in the public struct.
+ */
+if_t
+if_iter_start(struct if_iter *iter)
+{
+	if_t ifp;
+	NET_EPOCH_ASSERT();
+
+	bzero(iter, sizeof(*iter));
+	ifp = CK_STAILQ_FIRST(&V_ifnet);
+	iter->context[0] = ifp;
+	if (iter->context[0] != NULL)
+		iter->context[1] = CK_STAILQ_NEXT(ifp, if_link);
+
+	return (iter->context[0]);
+}
+
+if_t
+if_iter_next(struct if_iter *iter)
+{
+	if_t cur_ifp = iter->context[1];
+
+	iter->context[0] = cur_ifp;
+	if (cur_ifp != NULL)
+		iter->context[1] = CK_STAILQ_NEXT(cur_ifp, if_link);
+	return (cur_ifp);
+}
+
+void
+if_iter_finish(struct if_iter *iter)
+{
+	/* Nothing to do here for now. */
+}
+
 u_int
 if_foreach_lladdr(if_t ifp, iflladdr_cb_t cb, void *cb_arg)
 {
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -684,6 +684,15 @@
 int	if_foreach(if_foreach_cb_t, void *);
 int	if_foreach_sleep(if_foreach_match_t, void *, if_foreach_cb_t, void *);
 
+/* Opaque iterator structure for iterating over interfaces. */
+struct if_iter {
+	void *context[4];
+};
+
+if_t	if_iter_start(struct if_iter *);
+if_t	if_iter_next(struct if_iter *);
+void	if_iter_finish(struct if_iter *);
+
 /* Functions */
 void if_setinitfn(if_t ifp, if_init_fn_t);
 void if_setinputfn(if_t ifp, if_input_fn_t);