--- zzzz-none-000/linux-4.4.60/include/net/inet_frag.h	2017-04-08 07:53:53.000000000 +0000
+++ hawkeye-5590-729/linux-4.4.60/include/net/inet_frag.h	2022-03-30 14:21:53.000000000 +0000
@@ -50,7 +50,8 @@
 	struct timer_list	timer;
 	struct hlist_node	list;
 	atomic_t		refcnt;
-	struct sk_buff		*fragments;
+	struct sk_buff		*fragments;	/* Used in IPv6. */
+	struct rb_root		rb_fragments;	/* Used in IPv4. */
 	struct sk_buff		*fragments_tail;
 	ktime_t			stamp;
 	int			len;