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      1 /*	$NetBSD: udp.h,v 1.19 2021/02/03 18:13:13 roy Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1982, 1986, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)udp.h	8.1 (Berkeley) 6/10/93
     32  */
     33 
     34 #ifndef _NETINET_UDP_H_
     35 #define _NETINET_UDP_H_
     36 
     37 #include <sys/types.h>
     38 /*
     39  * Udp protocol header.
     40  * Per RFC 768, September, 1981.
     41  */
     42 struct udphdr {
     43 	uint16_t uh_sport;		/* source port */
     44 	uint16_t uh_dport;		/* destination port */
     45 	uint16_t uh_ulen;		/* udp length */
     46 	uint16_t uh_sum;		/* udp checksum */
     47 };
     48 #ifdef __CTASSERT
     49 __CTASSERT(sizeof(struct udphdr) == 8);
     50 #endif
     51 
     52 /* socket options for UDP */
     53 #define	UDP_ENCAP	100
     54 
     55 /* Encapsulation types */
     56 #define UDP_ENCAP_ESPINUDP_NON_IKE 	1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
     57 #define UDP_ENCAP_ESPINUDP		2 /* draft-ietf-ipsec-udp-encaps-06 */
     58 
     59 /* Default encapsulation port */
     60 #define UDP_ENCAP_ESPINUDP_PORT		500
     61 
     62 /* Maximum UDP fragment size for ESP over UDP */
     63 #define UDP_ENCAP_ESPINUDP_MAXFRAGLEN	552
     64 
     65 #endif /* !_NETINET_UDP_H_ */
     66