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 
23 struct 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 accpeting 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 /* 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 
47 #endif /* _UAPI_LINUX_UDP_H */
48