--- zzzz-none-000/linux-4.1.52/include/net/inet6_connection_sock.h	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/include/net/inet6_connection_sock.h	2022-03-02 11:37:13.000000000 +0000
@@ -27,6 +27,10 @@
 
 struct dst_entry *inet6_csk_route_req(struct sock *sk, struct flowi6 *fl6,
 				      const struct request_sock *req);
+#if defined(CONFIG_BCM_MPTCP) && defined(CONFIG_BCM_KF_MPTCP)
+u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
+		    const u32 rnd, const u32 synq_hsize);
+#endif
 
 struct request_sock *inet6_csk_search_req(struct sock *sk,
 					  const __be16 rport,