diff --git a/ospf6d/ospf6_dbex.h b/ospf6d/ospf6_dbex.h
new file mode 100644
index 0000000..fbb7dc5
--- /dev/null
+++ b/ospf6d/ospf6_dbex.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 1999 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_DBEX_H
+#define OSPF6_DBEX_H
+
+/* for ack_type() */
+#define NO_ACK       0
+#define DELAYED_ACK  1
+#define DIRECT_ACK   2
+
+/* Function Prototypes */
+void
+ospf6_add_delayed_ack (struct ospf6_lsa *, struct ospf6_interface *);
+void
+ospf6_remove_delayed_ack (struct ospf6_lsa *, struct ospf6_interface *);
+void ospf6_lsa_delayed_ack_remove_all (struct ospf6_lsa *lsa);
+
+void ospf6_dbex_prepare_summary (struct ospf6_neighbor *);
+
+int
+ospf6_dbex_check_dbdesc_lsa_header (struct ospf6_lsa_header *lsa_header,
+                                    struct ospf6_neighbor *from);
+
+void
+ospf6_dbex_acknowledge_delayed (struct ospf6_lsa *lsa,
+                                struct ospf6_interface *o6i);
+
+void
+ospf6_dbex_receive_lsa (struct ospf6_lsa_header *,
+                        struct ospf6_neighbor *);
+
+int ack_type (struct ospf6_lsa *, int, struct ospf6_neighbor *);
+
+void ospf6_dbex_flood (struct ospf6_lsa *, struct ospf6_neighbor *);
+
+void
+ospf6_dbex_remove_from_all_retrans_list (struct ospf6_lsa *lsa);
+
+#endif /* OSPF6_DBEX_H */
+