/*
 * 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
 * udp.h,v 1.3 1994/08/21 05:27:41 paul Exp
 */

#ifndef _UDP_H_
#define _UDP_H_

#define UDP_TTL 0x60
#define UDP_UDPDATALEN 16192

extern struct SLIRPsocket *udp_last_so;

/*
 * Udp protocol header.
 * Per RFC 768, September, 1981.
 */
#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(1)
#endif

struct udphdr {
        u_int16_t uh_sport; /* source port */
        u_int16_t uh_dport; /* destination port */
        int16_t uh_ulen;    /* udp length */
        u_int16_t uh_sum;   /* udp checksum */
} PACKED__;

#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(PACK_END)
#endif

/*
 * UDP kernel structures and variables.
 */
struct udpiphdr {
        struct ipovly ui_i; /* overlaid ip structure */
        struct udphdr ui_u; /* udp header */
};
#define ui_mbuf ui_i.ih_mbuf.m.mptr
#define ui_x1 ui_i.ih_x1
#define ui_pr ui_i.ih_pr
#define ui_len ui_i.ih_len
#define ui_src ui_i.ih_src
#define ui_dst ui_i.ih_dst
#define ui_sport ui_u.uh_sport
#define ui_dport ui_u.uh_dport
#define ui_ulen ui_u.uh_ulen
#define ui_sum ui_u.uh_sum

struct udpstat {
        /* input statistics: */
        u_long udps_ipackets;      /* total input packets */
        u_long udps_hdrops;        /* packet shorter than header */
        u_long udps_badsum;        /* checksum error */
        u_long udps_badlen;        /* data length larger than packet */
        u_long udps_noport;        /* no socket on port */
        u_long udps_noportbcast;   /* of above, arrived as broadcast */
        u_long udps_fullsock;      /* not delivered, input socket full */
        u_long udpps_pcbcachemiss; /* input packets missing pcb cache */
                                   /* output statistics: */
        u_long udps_opackets;      /* total output packets */
};

/*
 * Names for UDP sysctl objects
 */
#define UDPCTL_CHECKSUM 1 /* checksum UDP packets */
#define UDPCTL_MAXID 2

extern struct udpstat udpstat;
extern struct SLIRPsocket udb;
struct SLIRPmbuf;

void udp_init _P((void));
void udp_input _P((register struct SLIRPmbuf *, int));
int udp_output _P((struct SLIRPsocket *, struct SLIRPmbuf *, struct sockaddr_in *));
int udp_attach _P((struct SLIRPsocket *));
void udp_detach _P((struct SLIRPsocket *));
u_int8_t udp_tos _P((struct SLIRPsocket *));
void udp_emu _P((struct SLIRPsocket *, struct SLIRPmbuf *));
struct SLIRPsocket *udp_listen _P((u_int, u_int32_t, u_int, int));
int udp_output2(struct SLIRPsocket *so, struct SLIRPmbuf *m, struct sockaddr_in *saddr, struct sockaddr_in *daddr, int iptos);
#endif
