1/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Definitions for the UDP protocol.
8 *
9 * Version: @(#)udp.h 1.0.2 04/28/93
10 *
11 * Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 */
18#ifndef _UAPI_LINUX_UDP_H
19#define _UAPI_LINUX_UDP_H
20
21#include <linux/types.h>
22
23struct udphdr {
24 __be16 source;
25 __be16 dest;
26 __be16 len;
27 __sum16 check;
28};
29
30/* UDP socket options */
31#define UDP_CORK 1 /* Never send partially complete segments */
32#define UDP_ENCAP 100 /* Set the socket to accept encapsulated packets */
33#define UDP_NO_CHECK6_TX 101 /* Disable sending checksum for UDP6X */
34#define UDP_NO_CHECK6_RX 102 /* Disable accepting checksum for UDP6 */
35#define UDP_SEGMENT 103 /* Set GSO segmentation size */
36#define UDP_GRO 104 /* This socket can receive UDP GRO packets */
37
38/* UDP encapsulation types */
39#define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* unused draft-ietf-ipsec-nat-t-ike-00/01 */
40#define UDP_ENCAP_ESPINUDP 2 /* draft-ietf-ipsec-udp-encaps-06 */
41#define UDP_ENCAP_L2TPINUDP 3 /* rfc2661 */
42#define UDP_ENCAP_GTP0 4 /* GSM TS 09.60 */
43#define UDP_ENCAP_GTP1U 5 /* 3GPP TS 29.060 */
44#define UDP_ENCAP_RXRPC 6
45#define TCP_ENCAP_ESPINTCP 7 /* Yikes, this is really xfrm encap types. */
46#define UDP_ENCAP_OVPNINUDP 8 /* OpenVPN traffic */
47
48#endif /* _UAPI_LINUX_UDP_H */
49