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Add (again) support for divert sockets. They allow you to:

- queue packets from pf(4) to a userspace application
- reinject packets from the application into the kernel stack.

The divert socket can be bound to a special "divert port" and will
receive every packet diverted to that port by pf(4).

The pf syntax is pretty simple, e.g.:

pass on em0 inet proto tcp from any to any port 80 divert-packet port 1

A lot of discussion have happened since my last commit that resulted
in many changes and improvements.
I would *really* like to thank everyone who took part in the discussion
especially canacar@ who spotted out which are the limitations of this approach.

OpenBSD divert(4) is meant to be compatible with software running on
top of FreeBSD's divert sockets even though they are pretty different and will
become even more with time.

discusses with many, but mainly reyk@ canacar@ deraadt@ dlg@ claudio@ beck@
tested by reyk@ and myself
ok reyk@ claudio@ beck@
manpage help and ok by jmc@

/*	$OpenBSD: netstat.h,v 1.51 2009/10/04 16:08:37 michele Exp $	*/
/*	$NetBSD: netstat.h,v 1.6 1996/05/07 02:55:05 thorpej Exp $	*/

/*
 * Copyright (c) 1992, 1993
 *	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.
 *
 *	from: @(#)netstat.h	8.2 (Berkeley) 1/4/94
 */

#include <sys/cdefs.h>

/* What is the max length of a pointer printed with %p (including 0x)? */
#define PLEN	(LONG_BIT / 4 + 2)

int	Aflag;		/* show addresses of protocol control block */
int	aflag;		/* show all sockets (including servers) */
int	bflag;		/* show bytes instead of packets */
int	dflag;		/* show i/f dropped packets */
int	Fflag;		/* show routes whose gateways are in specified AF */
int	gflag;		/* show group (multicast) routing or stats */
int	iflag;		/* show interfaces */
int	lflag;		/* show routing table with use and ref */
int	mflag;		/* show memory stats */
int	nflag;		/* show addresses numerically */
int	pflag;		/* show given protocol */
int	Pflag;		/* show given PCB */
int	qflag;		/* only display non-zero values for output */
int	rflag;		/* show routing tables (or routing stats) */
int	sflag;		/* show protocol statistics */
int	tflag;		/* show i/f watchdog timers */
int	vflag;		/* be verbose */
int	Wflag;		/* show net80211 protocol statistics */

int	interval;	/* repeat interval for i/f stats */

char	*interface;	/* desired i/f for stats, or NULL for all i/fs */

int	af;		/* address family */

extern	char *__progname; /* program name, from crt0.o */


int	kread(u_long addr, void *buf, int size);
char	*plural(u_int64_t);
char	*plurales(u_int64_t);

void	protopr(u_long, char *);
void	ip6protopr(u_long, char *);
void	tcp_stats(char *);
void	udp_stats(char *);
void	ip_stats(char *);
void	div_stats(char *);
void	icmp_stats(char *);
void	igmp_stats(char *);
void	pim_stats(char *);
void	ah_stats(char *);
void	esp_stats(char *);
void	ipip_stats(char *);
void	carp_stats (char *);
void	pfsync_stats (char *);
void	pflow_stats (char *);
void	etherip_stats(char *);
void	ipcomp_stats(char *);

void	protopr(u_long, char *);

void	net80211_ifstats(char *);

void	tcp_dump(u_long);

void	mbpr(void);

void	hostpr(u_long, u_long);
void	impstats(u_long, u_long);

void	rt_stats(void);
void	pr_rthdr(int, int);
void	pr_encaphdr(void);
void	pr_family(int);

struct in6_addr;
struct sockaddr_in6;
void	ip6protopr(u_long, char *);
void	ip6_stats(char *);
void	ip6_ifstats(char *);
void	icmp6_stats(char *);
void	icmp6_ifstats(char *);
void	pim6_stats(char *);
void	rip6_stats(char *);
void	mroute6pr(u_long, u_long);
void	mrt6_stats(void);
char	*routename6(struct sockaddr_in6 *);
char	*netname6(struct sockaddr_in6 *, struct sockaddr_in6 *);

void	p_rttables(int, u_int);
void	p_flags(int, char *);
void	p_addr(struct sockaddr *, struct sockaddr *, int);
void	p_gwaddr(struct sockaddr *, int);
void	p_sockaddr(struct sockaddr *, struct sockaddr *, int, int);
char	*routename(struct sockaddr *);
char	*routename4(in_addr_t);
char	*netname(struct sockaddr *, struct sockaddr *);
char	*netname4(in_addr_t, in_addr_t);
void	routepr(u_long, u_long, u_long, u_long, u_int);

void	nsprotopr(u_long, char *);

void	intpr(int);

void	unixpr(u_long);

void	mroutepr(u_long, u_long, u_long);
void	mrt_stats(void);

void	atalkprotopr(u_long, char *);
void	ddp_stats(char *);
char	*atalk_print(const struct sockaddr *, int);
char	*atalk_print2(const struct sockaddr *, const struct sockaddr *, int);