--- zzzz-none-000/linux-4.4.60/include/linux/tcp.h	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/include/linux/tcp.h	2021-02-04 17:41:59.000000000 +0000
@@ -415,4 +415,7 @@
 	tp->saved_syn = NULL;
 }
 
+int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount,
+		  int shiftlen);
+
 #endif	/* _LINUX_TCP_H */