diff --git a/ospfd/ospf_ia.h b/ospfd/ospf_ia.h
new file mode 100644
index 0000000..afb2d4d
--- /dev/null
+++ b/ospfd/ospf_ia.h
@@ -0,0 +1,42 @@
+/*
+ * OSPF inter-area routing.
+ * Copyright (C) 1999, 2000 Alex Zinin, 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_IA_H
+#define _ZEBRA_OSPF_IA_H
+
+/* Macros. */
+#define OSPF_EXAMINE_SUMMARIES_ALL(A,N,R) \
+	{ \
+	  ospf_examine_summaries ((A), SUMMARY_LSDB ((A)), (N), (R)); \
+	  ospf_examine_summaries ((A), ASBR_SUMMARY_LSDB ((A)), (N), (R)); \
+	}
+
+#define OSPF_EXAMINE_TRANSIT_SUMMARIES_ALL(A,N,R) \
+	{ \
+	  ospf_examine_transit_summaries ((A), SUMMARY_LSDB ((A)), (N), (R)); \
+	  ospf_examine_transit_summaries ((A), ASBR_SUMMARY_LSDB ((A)), (N), (R)); \
+	}
+
+void ospf_ia_routing (struct route_table *, struct route_table *);
+int ospf_area_is_transit (struct ospf_area *);
+
+#endif /* _ZEBRA_OSPF_IA_H */