diff --git a/ospf6d/ospf6d.h b/ospf6d/ospf6d.h
index c738df6..3274242 100644
--- a/ospf6d/ospf6d.h
+++ b/ospf6d/ospf6d.h
@@ -22,7 +22,7 @@
 #ifndef OSPF6D_H
 #define OSPF6D_H
 
-#define OSPF6_DAEMON_VERSION    "0.9.7e"
+#define OSPF6_DAEMON_VERSION    "0.9.7i"
 
 /* global variables */
 extern int errno;
@@ -50,6 +50,12 @@
 #endif /* IPV6_DROP_MEMBERSHIP */
 #endif /* ! IPV6_LEAVE_GROUP */
 
+/* cast macro */
+#define OSPF6_PROCESS(x) ((struct ospf6 *) (x))
+#define OSPF6_AREA(x) ((struct ospf6_area *) (x))
+#define OSPF6_INTERFACE(x) ((struct ospf6_interface *) (x))
+#define OSPF6_NEIGHBOR(x) ((struct ospf6_neighbor *) (x))
+
 /* operation on timeval structure */
 #ifndef timerclear
 #define timerclear(a) (a)->tv_sec = (tvp)->tv_usec = 0