diff --git a/ospf6d/ospf6_bintree.h b/ospf6d/ospf6_bintree.h
new file mode 100644
index 0000000..fad8bbd
--- /dev/null
+++ b/ospf6d/ospf6_bintree.h
@@ -0,0 +1,47 @@
+
+#ifndef _BINTREE_H_
+#define _BINTREE_H_
+
+struct bintree_node
+{
+  struct bintree *tree;
+
+  struct bintree_node *parent;
+  int parent_link;
+
+#define BL_LEFT  0
+#define BL_RIGHT 1
+#define BL_MAX   2
+  struct bintree_node *link[BL_MAX];
+#define bl_left  link[BL_LEFT]
+#define bl_right link[BL_RIGHT]
+
+  void *data;
+};
+
+struct bintree
+{
+  int count;
+  struct bintree_node *root;
+
+  int  (*cmp)   (void *, void *);
+};
+
+void *bintree_lookup (void *data, struct bintree *tree);
+void *bintree_lookup_min (struct bintree *tree);
+void *bintree_lookup_max (struct bintree *tree);
+
+int   bintree_add (void *data, struct bintree *tree);
+int   bintree_remove (void *data, struct bintree *tree);
+
+void bintree_head (struct bintree *tree, struct bintree_node *node);
+int  bintree_end (struct bintree_node *node);
+void bintree_next (struct bintree_node *node);
+
+struct bintree *bintree_create ();
+void bintree_delete (struct bintree *);
+
+void bintree_print (void (*print) (int, void *), struct bintree *);
+
+#endif /*_BINTREE_H_*/
+