diff --git a/ospf6d/ospf6_hook.h b/ospf6d/ospf6_hook.h
new file mode 100644
index 0000000..fa882a5
--- /dev/null
+++ b/ospf6d/ospf6_hook.h
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2001 Yasuhiro Ohara
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the 
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 
+ * Boston, MA 02111-1307, USA.  
+ */
+
+#ifndef OSPF6_HOOK_H
+#define OSPF6_HOOK_H
+
+#include "ospf6_dump.h"
+
+struct ospf6_hook
+{
+  struct ospf6_hook *prev;
+  struct ospf6_hook *next;
+
+  char *name;
+  int (*hook_add) (void *);
+  int (*hook_change) (void *);
+  int (*hook_remove) (void *);
+};
+
+struct ospf6_hook_master
+{
+  char *name;
+  struct ospf6_hook *head;
+  struct ospf6_hook *tail;
+  int count;
+};
+
+#define CALL_HOOKS(master,hookname,hookstr,data) \
+  {\
+    struct ospf6_hook *hook;\
+    for (hook = (master)->head; hook; hook = hook->next)\
+      {\
+        if (hook->hookname)\
+          {\
+            if (IS_OSPF6_DUMP_HOOK)\
+              zlog_info ("HOOK: Call %s hook: %s", (hookstr), hook->name);\
+            (*(hook->hookname)) (data);\
+          }\
+      }\
+  }
+#define CALL_ADD_HOOK(master,data) \
+  { CALL_HOOKS ((master), hook_add, "ADD", (data)) }
+#define CALL_CHANGE_HOOK(master,data) \
+  { CALL_HOOKS ((master), hook_change, "CHANGE", (data)) }
+#define CALL_REMOVE_HOOK(master,data) \
+  { CALL_HOOKS ((master), hook_remove, "REMOVE", (data)) }
+
+#define IS_HOOK_SET(hook) \
+  ((hook)->hook_add || (hook)->hook_change || (hook)->hook_remove)
+
+extern struct ospf6_hook_master neighbor_hook;
+extern struct ospf6_hook_master interface_hook;
+extern struct ospf6_hook_master area_hook;
+extern struct ospf6_hook_master top_hook;
+extern struct ospf6_hook_master database_hook;
+extern struct ospf6_hook_master intra_topology_hook;
+extern struct ospf6_hook_master inter_topology_hook;
+extern struct ospf6_hook_master route_hook;
+extern struct ospf6_hook_master redistribute_hook;
+
+void ospf6_hook_register (struct ospf6_hook *,
+                          struct ospf6_hook_master *);
+void ospf6_hook_unregister (struct ospf6_hook *,
+                            struct ospf6_hook_master *);
+void ospf6_hook_unregister_all (struct ospf6_hook_master *);
+void ospf6_hook_init ();
+
+#endif /*OSPF6_HOOK_H*/
+