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