/*	$NetBSD: udp_var.h,v 1.32 2007/02/17 22:34:12 dyoung 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 */
} __attribute__((__packed__));
#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_quad_t udps_ipackets;		/* total input packets */
	u_quad_t udps_hdrops;		/* packet shorter than header */
	u_quad_t udps_badsum;		/* checksum error */
	u_quad_t udps_badlen;		/* data length larger than packet */
	u_quad_t udps_noport;		/* no socket on port */
	u_quad_t udps_noportbcast;	/* of above, arrived as broadcast */
	u_quad_t udps_fullsock;		/* not delivered, input socket full */
	u_quad_t udps_pcbhashmiss;	/* input packets missing pcb hash */
					/* output statistics: */
	u_quad_t udps_opackets;		/* total output packets */
};

/*
 * 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 */
#define	UDPCTL_MAXID		6

#define UDPCTL_NAMES { \
	{ 0, 0 }, \
	{ "checksum", CTLTYPE_INT }, \
	{ "sendspace", CTLTYPE_INT }, \
	{ "recvspace", CTLTYPE_INT }, \
	{ "do_loopback_cksum", CTLTYPE_INT }, \
	{ "stats", CTLTYPE_STRUCT }, \
}

#ifdef _KERNEL
extern	struct	inpcbtable udbtable;
extern	struct	udpstat udpstat;

#ifdef __NO_STRICT_ALIGNMENT
#define	UDP_HDR_ALIGNED_P(uh)	1
#else
#define	UDP_HDR_ALIGNED_P(uh)	((((vaddr_t) (uh)) & 3) == 0)
#endif

void	 *udp_ctlinput(int, const struct sockaddr *, void *);
int	 udp_ctloutput(int, struct socket *, int, int, struct mbuf **);
void	 udp_init(void);
void	 udp_input(struct mbuf *, ...);
int	 udp_output(struct mbuf *, ...);
int	 udp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
int	 udp_usrreq(struct socket *,
	    int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);

int	 udp_input_checksum(int af, struct mbuf *, const struct udphdr *, int,
	    int);
#endif

#endif /* !_NETINET_UDP_VAR_H_ */