put rules in doubly linked list
diff --git a/include/ebtables_u.h b/include/ebtables_u.h
index 1c87117..e63cc45 100644
--- a/include/ebtables_u.h
+++ b/include/ebtables_u.h
@@ -123,6 +123,7 @@
 	struct ebt_u_match_list *m_list;
 	struct ebt_u_watcher_list *w_list;
 	struct ebt_entry_target *t;
+	struct ebt_u_entry *prev;
 	struct ebt_u_entry *next;
 	struct ebt_counter cnt;
 	struct ebt_counter cnt_surplus; /* for increasing/decreasing a counter and for option 'C' */