1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1993
5 *	The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	@(#)udp.h	8.1 (Berkeley) 6/10/93
33 * $FreeBSD$
34 */
35
36#ifndef _NETINET_UDP_H_
37#define	_NETINET_UDP_H_
38
39/*
40 * UDP protocol header.
41 * Per RFC 768, September, 1981.
42 */
43struct udphdr {
44	u_short	uh_sport;		/* source port */
45	u_short	uh_dport;		/* destination port */
46	u_short	uh_ulen;		/* udp length */
47	u_short	uh_sum;			/* udp checksum */
48};
49
50/*
51 * User-settable options (used with setsockopt).
52 */
53#define	UDP_ENCAP			1
54
55/* Start of reserved space for third-party user-settable options. */
56#define	UDP_VENDOR			SO_VENDOR
57
58/*
59 * UDP Encapsulation of IPsec Packets options.
60 */
61/* Encapsulation types. */
62#define	UDP_ENCAP_ESPINUDP_NON_IKE	1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
63#define	UDP_ENCAP_ESPINUDP		2 /* RFC3948 */
64
65/* Default ESP in UDP encapsulation port. */
66#define	UDP_ENCAP_ESPINUDP_PORT		500
67
68/* Maximum UDP fragment size for ESP over UDP. */
69#define	UDP_ENCAP_ESPINUDP_MAXFRAGLEN	552
70
71#endif
72