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 /* 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  
47  #endif /* _UAPI_LINUX_UDP_H */
48