1/*-
2 * Copyright (c) 1982, 1986, 1993
3 *	The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 *	@(#)udp.h	8.1 (Berkeley) 6/10/93
31 * $FreeBSD: stable/11/sys/netinet/udp.h 315514 2017-03-18 22:04:20Z ae $
32 */
33
34#ifndef _NETINET_UDP_H_
35#define	_NETINET_UDP_H_
36
37/*
38 * UDP protocol header.
39 * Per RFC 768, September, 1981.
40 */
41struct udphdr {
42	u_short	uh_sport;		/* source port */
43	u_short	uh_dport;		/* destination port */
44	u_short	uh_ulen;		/* udp length */
45	u_short	uh_sum;			/* udp checksum */
46};
47
48/*
49 * User-settable options (used with setsockopt).
50 */
51#define	UDP_ENCAP			1
52
53/* Start of reserved space for third-party user-settable options. */
54#define	UDP_VENDOR			SO_VENDOR
55
56/*
57 * UDP Encapsulation of IPsec Packets options.
58 */
59/* Encapsulation types. */
60#define	UDP_ENCAP_ESPINUDP_NON_IKE	1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
61#define	UDP_ENCAP_ESPINUDP		2 /* RFC3948 */
62
63/* Default ESP in UDP encapsulation port. */
64#define	UDP_ENCAP_ESPINUDP_PORT		500
65
66/* Maximum UDP fragment size for ESP over UDP. */
67#define	UDP_ENCAP_ESPINUDP_MAXFRAGLEN	552
68
69#endif
70