--- zzzz-none-000/linux-4.4.60/net/ipv6/ndisc.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/net/ipv6/ndisc.c	2021-02-04 17:41:59.000000000 +0000
@@ -594,6 +594,7 @@
 
 	ndisc_send_skb(skb, daddr, saddr);
 }
+EXPORT_SYMBOL(ndisc_send_ns);
 
 void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
 		   const struct in6_addr *daddr)