diff --git a/ospfd/ospf_lsdb.h b/ospfd/ospf_lsdb.h
new file mode 100644
index 0000000..34344b3
--- /dev/null
+++ b/ospfd/ospf_lsdb.h
@@ -0,0 +1,83 @@
+/*
+ * OSPF LSDB support.
+ * Copyright (C) 1999, 2000 Alex Zinin, Kunihiro Ishiguro, Toshiaki Takada
+ *
+ * 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 _ZEBRA_OSPF_LSDB_H
+#define _ZEBRA_OSPF_LSDB_H
+
+/* OSPF LSDB structure. */
+struct ospf_lsdb
+{
+  struct
+  {
+    unsigned long count;
+    unsigned long count_self;
+    struct route_table *db;
+  } type[OSPF_MAX_LSA];
+  unsigned long total;
+#define MONITOR_LSDB_CHANGE 1 /* XXX */
+#ifdef MONITOR_LSDB_CHANGE
+  /* Hooks for callback functions to catch every add/del event. */
+  int (* new_lsa_hook)(struct ospf_lsa *);
+  int (* del_lsa_hook)(struct ospf_lsa *);
+#endif /* MONITOR_LSDB_CHANGE */
+};
+
+/* Macros. */
+#define LSDB_LOOP(T,N,L) \
+  for ((N) = route_top ((T)); ((N)); ((N)) = route_next ((N))) \
+    if (((L) = (N)->info))
+
+#define ROUTER_LSDB(A)       ((A)->lsdb->type[OSPF_ROUTER_LSA].db)
+#define NETWORK_LSDB(A)	     ((A)->lsdb->type[OSPF_NETWORK_LSA].db)
+#define SUMMARY_LSDB(A)      ((A)->lsdb->type[OSPF_SUMMARY_LSA].db)
+#define ASBR_SUMMARY_LSDB(A) ((A)->lsdb->type[OSPF_ASBR_SUMMARY_LSA].db)
+#define EXTERNAL_LSDB(O)     ((O)->lsdb->type[OSPF_AS_EXTERNAL_LSA].db)
+#define NSSA_LSDB(A)         ((A)->lsdb->type[OSPF_AS_NSSA_LSA].db)
+#define OPAQUE_LINK_LSDB(A)  ((A)->lsdb->type[OSPF_OPAQUE_LINK_LSA].db)
+#define OPAQUE_AREA_LSDB(A)  ((A)->lsdb->type[OSPF_OPAQUE_AREA_LSA].db)
+#define OPAQUE_AS_LSDB(O)    ((O)->lsdb->type[OSPF_OPAQUE_AS_LSA].db)
+
+#define AREA_LSDB(A,T)       ((A)->lsdb->type[(T)].db)
+#define AS_LSDB(O,T)         ((O)->lsdb->type[(T)].db)
+
+/* OSPF LSDB related functions. */
+struct ospf_lsdb *ospf_lsdb_new ();
+void ospf_lsdb_init (struct ospf_lsdb *);
+void ospf_lsdb_free (struct ospf_lsdb *);
+void ospf_lsdb_cleanup (struct ospf_lsdb *);
+void ospf_lsdb_add (struct ospf_lsdb *, struct ospf_lsa *);
+void ospf_lsdb_delete (struct ospf_lsdb *, struct ospf_lsa *);
+void ospf_lsdb_delete_all (struct ospf_lsdb *);
+struct ospf_lsa *ospf_lsdb_lookup (struct ospf_lsdb *, struct ospf_lsa *);
+struct ospf_lsa *ospf_lsdb_lookup_by_id (struct ospf_lsdb *, u_char,
+					struct in_addr, struct in_addr);
+struct ospf_lsa *ospf_lsdb_lookup_by_id_next (struct ospf_lsdb *, u_char,
+					     struct in_addr, struct in_addr,
+					     int);
+unsigned long ospf_lsdb_count_all (struct ospf_lsdb *);
+unsigned long ospf_lsdb_count (struct ospf_lsdb *, int);
+unsigned long ospf_lsdb_count_self (struct ospf_lsdb *, int);
+unsigned long ospf_lsdb_isempty (struct ospf_lsdb *);
+struct ospf_lsa *foreach_lsa (struct route_table *, void *, int,
+	              int (*callback) (struct ospf_lsa *, void *, int));
+
+#endif /* _ZEBRA_OSPF_LSDB_H */