diff --git a/lib/hash.h b/lib/hash.h
new file mode 100644
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--- /dev/null
+++ b/lib/hash.h
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+/* Hash routine.
+   Copyright (C) 1998 Kunihiro Ishiguro
+
+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_HASH_H
+#define _ZEBRA_HASH_H
+
+/* Default hash table size.  */ 
+#define HASHTABSIZE     1024
+
+struct hash_backet
+{
+  /* Linked list.  */
+  struct hash_backet *next;
+
+  /* Hash key. */
+  unsigned int key;
+
+  /* Data.  */
+  void *data;
+};
+
+struct hash
+{
+  /* Hash backet. */
+  struct hash_backet **index;
+
+  /* Hash table size. */
+  unsigned int size;
+
+  /* Key make function. */
+  unsigned int (*hash_key) ();
+
+  /* Data compare function. */
+  int (*hash_cmp) ();
+
+  /* Backet alloc. */
+  unsigned long count;
+};
+
+struct hash *hash_create (unsigned int (*) (), int (*) ());
+struct hash *hash_create_size (unsigned int, unsigned int (*) (), int (*) ());
+
+void *hash_get (struct hash *, void *, void * (*) ());
+void *hash_alloc_intern (void *);
+void *hash_lookup (struct hash *, void *);
+void *hash_release (struct hash *, void *);
+
+void hash_iterate (struct hash *, 
+		   void (*) (struct hash_backet *, void *), void *);
+
+void hash_clean (struct hash *, void (*) (void *));
+void hash_free (struct hash *);
+
+#endif /* _ZEBRA_HASH_H */