--- zzzz-none-000/linux-4.9.231/include/net/addrconf.h	2020-07-22 07:10:54.000000000 +0000
+++ falcon-5590-729/linux-4.9.231/include/net/addrconf.h	2022-03-30 12:03:35.000000000 +0000
@@ -174,6 +174,8 @@
  */
 int ipv6_sock_mc_join(struct sock *sk, int ifindex,
 		      const struct in6_addr *addr);
+int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
+			  const struct in6_addr *addr, unsigned int mode);
 int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
 		      const struct in6_addr *addr);
 void __ipv6_sock_mc_close(struct sock *sk);