Added a function to reset the enumerator of a linked list.

src/libstrongswan/utils/linked_list.h

@@ -84,6 +84,13 @@ struct linked_list_t {
 	 */
 	enumerator_t* (*create_enumerator)(linked_list_t *this);
 
+	/**
+	 * Resets the enumerator's current position to the beginning of the list.
+	 *
+	 * @param enumerator	enumerator to reset
+	 */
+	void (*reset_enumerator)(linked_list_t *this, enumerator_t *enumerator);
+
 	/**
 	 * Inserts a new item at the beginning of the list.
 	 *