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/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions for the UDP protocol.
 *
 * Version:     @(#)udp.h       1.0.2   04/28/93
 *
 * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 */
#ifndef _LINUX_UDP_H
#define _LINUX_UDP_H

#include <linux/types.h>

struct udphdr {
        __u16   source;
        __u16   dest;
        __u16   len;
        __u16   check;
};

/* UDP socket options */
#define UDP_CORK        1       /* Never send partially complete segments */
#define UDP_ENCAP       100     /* Set the socket to accept encapsulated packets */

/* UDP encapsulation types */
#define UDP_ENCAP_ESPINUDP      2 /* draft-ietf-ipsec-udp-encaps-06 */

#ifdef __KERNEL__

#include <linux/config.h>
#include <net/sock.h>
#include <linux/ip.h>

struct udp_opt {
        int             pending;        /* Any pending frames ? */
        unsigned int    corkflag;       /* Cork is required */
        __u16           encap_type;     /* Is this an Encapsulation socket? */
        /*
         * Following member retains the infomation to create a UDP header
         * when the socket is uncorked.
         */
        __u16           len;            /* total length of pending frames */
};

/* WARNING: don't change the layout of the members in udp_sock! */
struct udp_sock {
        struct sock       sk;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
        struct ipv6_pinfo *pinet6;
#endif
        struct inet_opt   inet;
        struct udp_opt    udp;
};

#define udp_sk(__sk) (&((struct udp_sock *)__sk)->udp)

#endif

#endif  /* _LINUX_UDP_H */