FreeBSD/Linux Kernel Cross Reference
sys/netinet/udp.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1982, 1986, 1993
      *      The Regents of the University of California.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)udp.h       8.1 (Berkeley) 6/10/93
     * $FreeBSD$
     */
    
    #ifndef _NETINET_UDP_H_
    #define _NETINET_UDP_H_
    
    /*
     * UDP protocol header.
     * Per RFC 768, September, 1981.
     */
    struct udphdr {
            u_short uh_sport;               /* source port */
            u_short uh_dport;               /* destination port */
            u_short uh_ulen;                /* udp length */
            u_short uh_sum;                 /* udp checksum */
    };
    
    /* 
     * User-settable options (used with setsockopt).
     */
    #define UDP_ENCAP                       1
    
    /* Start of reserved space for third-party user-settable options. */
    #define UDP_VENDOR                      SO_VENDOR
    
    /*
     * UDP Encapsulation of IPsec Packets options.
     */
    /* Encapsulation types. */
    #define UDP_ENCAP_ESPINUDP_NON_IKE      1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
    #define UDP_ENCAP_ESPINUDP              2 /* RFC3948 */
    
    /* Default ESP in UDP encapsulation port. */
    #define UDP_ENCAP_ESPINUDP_PORT         500
    
    /* Maximum UDP fragment size for ESP over UDP. */
    #define UDP_ENCAP_ESPINUDP_MAXFRAGLEN   552
    
    #endif

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