diff --git a/ospf6d/ospf6_prefix.h b/ospf6d/ospf6_prefix.h
new file mode 100644
index 0000000..65a8cbc
--- /dev/null
+++ b/ospf6d/ospf6_prefix.h
@@ -0,0 +1,83 @@
+/*
+ * 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_PREFIX_H
+#define OSPF6_PREFIX_H
+
+#include "linklist.h"
+
+#define OSPF6_PREFIX_OPTION_NU (1 << 0)  /* No Unicast */
+#define OSPF6_PREFIX_OPTION_LA (1 << 1)  /* Local Address */
+#define OSPF6_PREFIX_OPTION_MC (1 << 2)  /* MultiCast */
+#define OSPF6_PREFIX_OPTION_P  (1 << 3)  /* Propagate (NSSA) */
+
+struct ospf6_prefix
+{
+  u_int8_t prefix_length;
+  u_int8_t prefix_options;
+  union {
+    u_int16_t _prefix_metric;
+    u_int16_t _prefix_referenced_lstype;
+  } u;
+#define prefix_metric u._prefix_metric
+#define prefix_refer_lstype u._prefix_referenced_lstype
+  /* followed by one address_prefix */
+};
+
+/* size_t OSPF6_PREFIX_SPACE (int prefixlength); */
+#define OSPF6_PREFIX_SPACE(x) ((((x) + 31) / 32) * 4)
+
+/* size_t OSPF6_PREFIX_SIZE (struct ospf6_prefix *); */
+#define OSPF6_PREFIX_SIZE(x) \
+   (OSPF6_PREFIX_SPACE ((x)->prefix_length) + sizeof (struct ospf6_prefix))
+
+/* struct ospf6_prefix *OSPF6_NEXT_PREFIX (struct ospf6_prefix *); */
+#define OSPF6_NEXT_PREFIX(x) \
+   ((struct ospf6_prefix *)((char *)(x) + OSPF6_PREFIX_SIZE (x)))
+
+
+
+/* Function Prototypes */
+struct ospf6_prefix *
+  ospf6_prefix_make (u_int8_t, u_int16_t, struct prefix_ipv6 *);
+void ospf6_prefix_free (struct ospf6_prefix *);
+void ospf6_prefix_in6_addr (struct ospf6_prefix *, struct in6_addr *);
+void ospf6_prefix_copy (struct ospf6_prefix *, struct ospf6_prefix *,
+                        size_t);
+
+void ospf6_prefix_apply_mask (struct ospf6_prefix *);
+int ospf6_prefix_issame (struct ospf6_prefix *, struct ospf6_prefix *);
+
+char *ospf6_prefix_options_str (u_int8_t, char *, size_t);
+char *ospf6_prefix_string (struct ospf6_prefix *, char *, size_t);
+
+struct ospf6_prefix *
+ospf6_prefix_lookup (list l, struct ospf6_prefix *prefix);
+void ospf6_prefix_add (list, struct ospf6_prefix *);
+
+struct ospf6_prefix *
+ospf6_prefix_create (u_int8_t, u_int16_t, struct prefix_ipv6 *);
+void ospf6_prefix_delete (struct ospf6_prefix *);
+
+void ospf6_prefix_init ();
+
+#endif /* OSPF6_PREFIX_H */
+