v4.19.13 snapshot.
diff --git a/include/net/inet6_connection_sock.h b/include/net/inet6_connection_sock.h
new file mode 100644
index 0000000..8ec87b6
--- /dev/null
+++ b/include/net/inet6_connection_sock.h
@@ -0,0 +1,31 @@
+/*
+ * NET Generic infrastructure for INET6 connection oriented protocols.
+ *
+ * Authors: Many people, see the TCPv6 sources
+ *
+ * From code originally in TCPv6
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef _INET6_CONNECTION_SOCK_H
+#define _INET6_CONNECTION_SOCK_H
+
+#include <linux/types.h>
+
+struct request_sock;
+struct sk_buff;
+struct sock;
+struct sockaddr;
+
+struct dst_entry *inet6_csk_route_req(const struct sock *sk, struct flowi6 *fl6,
+ const struct request_sock *req, u8 proto);
+
+void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
+
+int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
+
+struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu);
+#endif /* _INET6_CONNECTION_SOCK_H */