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/*
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 * Copyright (c) 1982, 1986, 1993
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 *        The Regents of the University of California.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. All advertising materials mentioning features or use of this software
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 *    must display the following acknowledgement:
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 *        This product includes software developed by the University of
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 *        California, Berkeley and its contributors.
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 * 4. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 *        @(#)udp.h        8.1 (Berkeley) 6/10/93
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 * udp.h,v 1.3 1994/08/21 05:27:41 paul Exp
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 */
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#ifndef _UDP_H_
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#define _UDP_H_
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#define UDP_TTL 0x60
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#define UDP_UDPDATALEN 16192
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extern struct socket *udp_last_so;
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/*
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 * Udp protocol header.
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 * Per RFC 768, September, 1981.
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 */
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struct udphdr {
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        u_int16_t        uh_sport;                /* source port */
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        u_int16_t        uh_dport;                /* destination port */
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        int16_t        uh_ulen;                /* udp length */
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        u_int16_t        uh_sum;                        /* udp checksum */
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};
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/*
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 * UDP kernel structures and variables.
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 */
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struct udpiphdr {
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                struct  ipovly ui_i;            /* overlaid ip structure */
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                struct  udphdr ui_u;            /* udp header */
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};
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#define ui_next         ui_i.ih_next
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#define ui_prev         ui_i.ih_prev
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#define ui_x1           ui_i.ih_x1
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#define ui_pr           ui_i.ih_pr
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#define ui_len          ui_i.ih_len
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#define ui_src          ui_i.ih_src
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#define ui_dst          ui_i.ih_dst
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#define ui_sport        ui_u.uh_sport
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#define ui_dport        ui_u.uh_dport
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#define ui_ulen         ui_u.uh_ulen
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#define ui_sum          ui_u.uh_sum
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struct udpstat {
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                                        /* input statistics: */
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                u_long  udps_ipackets;          /* total input packets */
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                u_long  udps_hdrops;            /* packet shorter than header */
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                u_long  udps_badsum;            /* checksum error */
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                u_long  udps_badlen;            /* data length larger than packet */
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                u_long  udps_noport;            /* no socket on port */
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                u_long  udps_noportbcast;       /* of above, arrived as broadcast */
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                u_long  udps_fullsock;          /* not delivered, input socket full */
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                u_long  udpps_pcbcachemiss;     /* input packets missing pcb cache */
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                                        /* output statistics: */
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                u_long  udps_opackets;          /* total output packets */
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};
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/*
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 * Names for UDP sysctl objects
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 */
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#define UDPCTL_CHECKSUM         1       /* checksum UDP packets */
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#define UDPCTL_MAXID            2
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extern struct udpstat udpstat;
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extern struct socket udb;
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struct mbuf;
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void udp_init _P((void));
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void udp_input _P((register struct mbuf *, int));
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int udp_output _P((struct socket *, struct mbuf *, struct sockaddr_in *));
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int udp_attach _P((struct socket *));
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void udp_detach _P((struct socket *));
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u_int8_t udp_tos _P((struct socket *));
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void udp_emu _P((struct socket *, struct mbuf *));
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struct socket * udp_listen _P((u_int, u_int32_t, u_int, int));
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int udp_output2(struct socket *so, struct mbuf *m,
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                struct sockaddr_in *saddr, struct sockaddr_in *daddr,
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                int iptos);
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#endif