/*      $NetBSD: udp_var.h,v 1.48 2021/02/03 11:53:43 roy Exp $ */

/*
* Copyright (c) 1982, 1986, 1989, 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_var.h   8.1 (Berkeley) 6/10/93
*/

#ifndef _NETINET_UDP_VAR_H_
#define _NETINET_UDP_VAR_H_

/*
* UDP kernel structures and variables.
*/
struct  udpiphdr {
       struct  ipovly ui_i;            /* overlaid ip structure */
       struct  udphdr ui_u;            /* udp header */
};
#ifdef CTASSERT
CTASSERT(sizeof(struct udpiphdr) == 28);
#endif
#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

/*
* UDP statistics.
* Each counter is an unsigned 64-bit value.
*/
#define UDP_STAT_IPACKETS       0       /* total input packets */
#define UDP_STAT_HDROPS         1       /* packet shorter than header */
#define UDP_STAT_BADSUM         2       /* checksum error */
#define UDP_STAT_BADLEN         3       /* data length larger than packet */
#define UDP_STAT_NOPORT         4       /* no socket on port */
#define UDP_STAT_NOPORTBCAST    5       /* of above, arrived as broadcast */
#define UDP_STAT_FULLSOCK       6       /* not delivered, input socket full */
#define UDP_STAT_PCBHASHMISS    7       /* input packets missing PCB hash */
#define UDP_STAT_OPACKETS       8       /* total output packets */

#define UDP_NSTATS              9

/*
* Names for UDP sysctl objects
*/
#define UDPCTL_CHECKSUM         1       /* checksum UDP packets */
#define UDPCTL_SENDSPACE        2       /* default send buffer */
#define UDPCTL_RECVSPACE        3       /* default recv buffer */
#define UDPCTL_LOOPBACKCKSUM    4       /* do UDP checksum on loopback */
#define UDPCTL_STATS            5       /* UDP statistics */

#ifdef _KERNEL

extern struct inpcbtable udbtable;
extern const struct pr_usrreqs udp_usrreqs;

void *udp_ctlinput(int, const struct sockaddr *, void *);
int udp_ctloutput(int, struct socket *, struct sockopt *);
void udp_init(void);
void udp_init_common(void);
void udp_input(struct mbuf *, int, int);
int udp_output(struct mbuf *, struct inpcb *, struct mbuf *, struct lwp *);
int udp_send(struct socket *, struct mbuf *, struct sockaddr *,
   struct mbuf *, struct lwp *);
int udp_input_checksum(int af, struct mbuf *, const struct udphdr *, int, int);
void udp_statinc(u_int);
#endif /* _KERNEL */

#endif /* !_NETINET_UDP_VAR_H_ */