--- zzzz-none-000/linux-4.19.183/net/ipv6/ipv6_sockglue.c	2021-03-24 10:07:39.000000000 +0000
+++ bcm63-7530ax-756/linux-4.19.183/net/ipv6/ipv6_sockglue.c	2023-06-28 08:54:21.000000000 +0000
@@ -48,6 +48,10 @@
 #include <net/addrconf.h>
 #include <net/inet_common.h>
 #include <net/tcp.h>
+#if defined(CONFIG_BCM_KF_MPTCP) && defined(CONFIG_BCM_MPTCP)
+#include <net/mptcp.h>
+#include <net/mptcp_v4.h>
+#endif
 #include <net/udp.h>
 #include <net/udplite.h>
 #include <net/xfrm.h>
@@ -223,7 +227,16 @@
 				sock_prot_inuse_add(net, &tcp_prot, 1);
 				local_bh_enable();
 				sk->sk_prot = &tcp_prot;
+#if !defined(CONFIG_BCM_KF_MPTCP) || !defined(CONFIG_BCM_MPTCP)
 				icsk->icsk_af_ops = &ipv4_specific;
+#else
+#ifdef CONFIG_MPTCP
+				if (sock_flag(sk, SOCK_MPTCP))
+					icsk->icsk_af_ops = &mptcp_v4_specific;
+				else
+#endif
+					icsk->icsk_af_ops = &ipv4_specific;
+#endif
 				sk->sk_socket->ops = &inet_stream_ops;
 				sk->sk_family = PF_INET;
 				tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);