new file mode 100644
--- /dev/null
+++ b/src/core/ngx_radix_tree.h
@@ -0,0 +1,34 @@
+#ifndef _NGX_RADIX_TREE_H_INCLUDED_
+#define _NGX_RADIX_TREE_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+typedef struct ngx_radix_node_s  ngx_radix_node_t;
+
+struct ngx_radix_node_s {
+    uintptr_t          value;
+    ngx_radix_node_t  *right;
+    ngx_radix_node_t  *left;
+};
+
+
+typedef struct {
+    ngx_radix_node_t  *root;
+    ngx_pool_t        *pool;
+    char              *free;
+    size_t             size;
+} ngx_radix_tree_t;
+
+
+ngx_radix_tree_t *ngx_radix_tree_create(ngx_pool_t *pool);
+ngx_int_t ngx_radix32tree_insert(ngx_radix_tree_t *tree,
+                                 uint32_t key, uint32_t mask, uintptr_t value);
+void ngx_radix32tree_delete(ngx_radix_tree_t *tree,
+                            uint32_t key, uint32_t mask);
+uintptr_t ngx_radix32tree_find(ngx_radix_tree_t *tree, uint32_t key);
+
+
+#endif /* _NGX_RADIX_TREE_H_INCLUDED_ */