v4.19.13 snapshot.
diff --git a/include/uapi/linux/udp.h b/include/uapi/linux/udp.h
new file mode 100644
index 0000000..09502de
--- /dev/null
+++ b/include/uapi/linux/udp.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Definitions for the UDP protocol.
+ *
+ * Version: @(#)udp.h 1.0.2 04/28/93
+ *
+ * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *
+ * 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 _UAPI_LINUX_UDP_H
+#define _UAPI_LINUX_UDP_H
+
+#include <linux/types.h>
+
+struct udphdr {
+ __be16 source;
+ __be16 dest;
+ __be16 len;
+ __sum16 check;
+};
+
+/* UDP socket options */
+#define UDP_CORK 1 /* Never send partially complete segments */
+#define UDP_ENCAP 100 /* Set the socket to accept encapsulated packets */
+#define UDP_NO_CHECK6_TX 101 /* Disable sending checksum for UDP6X */
+#define UDP_NO_CHECK6_RX 102 /* Disable accpeting checksum for UDP6 */
+#define UDP_SEGMENT 103 /* Set GSO segmentation size */
+
+/* UDP encapsulation types */
+#define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
+#define UDP_ENCAP_ESPINUDP 2 /* draft-ietf-ipsec-udp-encaps-06 */
+#define UDP_ENCAP_L2TPINUDP 3 /* rfc2661 */
+#define UDP_ENCAP_GTP0 4 /* GSM TS 09.60 */
+#define UDP_ENCAP_GTP1U 5 /* 3GPP TS 29.060 */
+#define UDP_ENCAP_RXRPC 6
+
+#endif /* _UAPI_LINUX_UDP_H */