xref: /freebsd/sys/netinet/udp.h (revision 8df8b2d3e51d1b816201d8a1fe8bc29fe192e562)
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  */
43 struct 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