Nuke the old antique copy of ipfilter from the tree. This is old enough

to be dangerous.  It will better serve us as a port building a KLD,
ala SKIP.

The hooks are staying although it would be better to port and use
the NetBSD pfil interface rather than have custom hooks.

1 files changed, 0 insertions, 1255 deletions

diff --git a/sys/netinet/ip_fil.c b/sys/netinet/ip_fil.c
deleted file mode 100644
index 2dbea5d..0000000
--- a/sys/netinet/ip_fil.c
+++ /dev/null
@@ -1,1255 +0,0 @@
-/*
- * Copyright (C) 1993-1997 by Darren Reed.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that this notice is preserved and due credit is given
- * to the original author and the contributors.
- */
-#if !defined(lint)
-static const char sccsid[] = "@(#)ip_fil.c	2.41 6/5/96 (C) 1993-1995 Darren Reed";
-static const char rcsid[] = "@(#)$FreeBSD$";
-#endif
-
-#include "opt_ipfilter.h"
-
-#ifndef	SOLARIS
-#define	SOLARIS	(defined(sun) && (defined(__svr4__) || defined(__SVR4)))
-#endif
-
-#if defined(KERNEL) && !defined(_KERNEL)
-# define	_KERNEL
-#endif
-#ifdef	__FreeBSD__
-# if defined(_KERNEL) && !defined(IPFILTER_LKM)
-#  define __FreeBSD_version 300000	/* this will do as a hack */
-# else
-#  include <osreldate.h>
-# endif
-#endif
-#ifndef	_KERNEL
-# include <stdio.h>
-# include <string.h>
-# include <stdlib.h>
-# include <ctype.h>
-#endif
-#include <sys/errno.h>
-#include <sys/types.h>
-#include <sys/param.h>
-#include <sys/file.h>
-#if __FreeBSD_version >= 220000 && defined(_KERNEL)
-# include <sys/fcntl.h>
-# include <sys/filio.h>
-#else
-# include <sys/ioctl.h>
-#endif
-#include <sys/time.h>
-#ifdef	_KERNEL
-# include <sys/systm.h>
-#endif
-#include <sys/uio.h>
-#if !SOLARIS
-# if (NetBSD > 199609) || (OpenBSD > 199603) || __FreeBSD_version >= 220000
-#  include <sys/dirent.h>
-# else
-#  include <sys/dir.h>
-# endif
-# include <sys/mbuf.h>
-#else
-# include <sys/filio.h>
-#endif
-#include <sys/protosw.h>
-#include <sys/socket.h>
-
-#include <net/if.h>
-#ifdef sun
-# include <net/af.h>
-#endif
-#if __FreeBSD_version >= 300000
-# include <net/if_var.h>
-# include <sys/malloc.h>
-#endif
-#ifdef __sgi
-#include <sys/debug.h>
-# ifdef IFF_DRVRLOCK /* IRIX6 */
-#include <sys/hashing.h>
-# endif
-#endif
-#include <net/route.h>
-#include <netinet/in.h>
-#if !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /* IRIX < 6 */
-#include <netinet/in_var.h>
-#endif
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/ip_var.h>
-#include <netinet/tcp.h>
-#include <netinet/udp.h>
-#include <netinet/tcpip.h>
-#include <netinet/ip_icmp.h>
-#ifndef	_KERNEL
-# include <syslog.h>
-#endif
-#include "netinet/ip_compat.h"
-#include "netinet/ip_fil.h"
-#include "netinet/ip_proxy.h"
-#include "netinet/ip_nat.h"
-#include "netinet/ip_frag.h"
-#include "netinet/ip_state.h"
-#include "netinet/ip_auth.h"
-#ifndef	MIN
-#define	MIN(a,b)	(((a)<(b))?(a):(b))
-#endif
-#if	!SOLARIS && defined(_KERNEL)
-extern	int	ip_optcopy __P((struct ip *, struct ip *));
-#endif
-
-
-extern	struct	protosw	inetsw[];
-
-#ifndef	_KERNEL
-# include "ipt.h"
-static	struct	ifnet **ifneta = NULL;
-static	int	nifs = 0;
-#else
-# if	(BSD < 199306) && !defined(__sgi)
-static	int	(*fr_saveslowtimo) __P((void));
-# else
-static	void	(*fr_saveslowtimo) __P((void));
-# endif
-# if	(BSD < 199306) || defined(__sgi)
-extern	int	tcp_ttl;
-# endif
-#endif
-
-int	ipl_inited = 0;
-int	ipl_unreach = ICMP_UNREACH_FILTER;
-u_long	ipl_frouteok[2] = {0, 0};
-
-static	void	fixskip __P((frentry_t **, frentry_t *, int));
-static	void	frzerostats __P((caddr_t));
-static	void	frsync __P((void));
-#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
-static	int	frrequest __P((int, u_long, caddr_t, int));
-#else
-static	int	frrequest __P((int, int, caddr_t, int));
-#endif
-#ifdef	_KERNEL
-static	int	(*fr_savep) __P((ip_t *, int, void *, int, struct mbuf **));
-#else
-int	ipllog __P((void));
-void	init_ifp __P((void));
-# ifdef __sgi
-static int 	no_output __P((struct ifnet *, struct mbuf *,
-			       struct sockaddr *));
-static int	write_output __P((struct ifnet *, struct mbuf *,
-				  struct sockaddr *));
-# else
-static int 	no_output __P((struct ifnet *, struct mbuf *,
-			       struct sockaddr *, struct rtentry *));
-static int	write_output __P((struct ifnet *, struct mbuf *,
-				  struct sockaddr *, struct rtentry *));
-# endif
-#endif
-
-#if (_BSDI_VERSION >= 199510) && defined(_KERNEL)
-# include <sys/device.h>
-# include <sys/conf.h>
-
-struct cfdriver iplcd = {
-	NULL, "ipl", NULL, NULL, DV_DULL, 0
-};
-
-struct devsw iplsw = {
-	&iplcd,
-	iplopen, iplclose, iplread, nowrite, iplioctl, noselect, nommap,
-	nostrat, nodump, nopsize, 0,
-	nostop
-};
-#endif /* _BSDI_VERSION >= 199510  && _KERNEL */
-
-#if defined(__NetBSD__) || defined(__OpenBSD__)  || (_BSDI_VERSION >= 199701)
-# include <sys/conf.h>
-# if defined(NETBSD_PF)
-#  include <net/pfil.h>
-/*
- * We provide the fr_checkp name just to minimize changes later.
- */
-int (*fr_checkp) __P((ip_t *ip, int hlen, void *ifp, int out, mb_t **mp));
-# endif /* NETBSD_PF */
-#endif /* __NetBSD__ */
-
-#ifdef	_KERNEL
-# if	defined(IPFILTER_LKM) && !defined(__sgi)
-int iplidentify(s)
-char *s;
-{
-	if (strcmp(s, "ipl") == 0)
-		return 1;
-	return 0;
-}
-# endif /* IPFILTER_LKM */
-
-
-/*
- * Try to detect the case when compiling for NetBSD with pseudo-device
- */
-# if defined(__NetBSD__) && defined(PFIL_HOOKS)
-void
-ipfilterattach(count)
-int count;
-{
-	iplattach();
-}
-# endif
-
-
-int iplattach()
-{
-	char *defpass;
-	int s;
-# ifdef __sgi
-	int error;
-# endif
-
-	SPL_NET(s);
-	if (ipl_inited || (fr_checkp == fr_check)) {
-		printf("IP Filter: already initialized\n");
-		SPL_X(s);
-		return EBUSY;
-	}
-
-# ifdef NETBSD_PF
-	pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
-# endif
-
-# ifdef __sgi
-	error = ipfilter_sgi_attach();
-	if (error) {
-		SPL_X(s);
-		return error;
-	}
-# endif
-
-	ipl_inited = 1;
-	bzero((char *)frcache, sizeof(frcache));
-	bzero((char *)nat_table, sizeof(nat_table));
-	fr_savep = fr_checkp;
-	fr_checkp = fr_check;
-	fr_saveslowtimo = inetsw[0].pr_slowtimo;
-	inetsw[0].pr_slowtimo = ipfr_slowtimer;
-
-# ifdef	IPFILTER_LOG
-	ipflog_init();
-# endif
-	SPL_X(s);
-	if (fr_pass & FR_PASS)
-		defpass = "pass";
-	else if (fr_pass & FR_BLOCK)
-		defpass = "block";
-	else
-		defpass = "no-match -> block";
-
-	printf("IP Filter: initialized.  Default = %s all, Logging = %s\n",
-		defpass,
-# ifdef	IPFILTER_LOG
-		"enabled");
-# else
-		"disabled");
-# endif
-	return 0;
-}
-
-
-/*
- * Disable the filter by removing the hooks from the IP input/output
- * stream.
- */
-int ipldetach()
-{
-	int s, i = FR_INQUE|FR_OUTQUE;
-
-	SPL_NET(s);
-	if (!ipl_inited)
-	{
-		printf("IP Filter: not initialized\n");
-		SPL_X(s);
-		return 0;
-	}
-
-	fr_checkp = fr_savep;
-	inetsw[0].pr_slowtimo = fr_saveslowtimo;
-	frflush(IPL_LOGIPF, &i);
-	ipl_inited = 0;
-
-# ifdef NETBSD_PF
-	pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
-# endif
-
-# ifdef __sgi
-	ipfilter_sgi_detach();
-# endif
-
-	ipfr_unload();
-	ip_natunload();
-	fr_stateunload();
-	fr_authunload();
-
-	SPL_X(s);
-	return 0;
-}
-#endif /* _KERNEL */
-
-
-static	void	frzerostats(data)
-caddr_t	data;
-{
-	struct	friostat	fio;
-
-	bcopy((char *)frstats, (char *)fio.f_st,
-		sizeof(struct filterstats) * 2);
-	fio.f_fin[0] = ipfilter[0][0];
-	fio.f_fin[1] = ipfilter[0][1];
-	fio.f_fout[0] = ipfilter[1][0];
-	fio.f_fout[1] = ipfilter[1][1];
-	fio.f_acctin[0] = ipacct[0][0];
-	fio.f_acctin[1] = ipacct[0][1];
-	fio.f_acctout[0] = ipacct[1][0];
-	fio.f_acctout[1] = ipacct[1][1];
-	fio.f_active = fr_active;
-	fio.f_froute[0] = ipl_frouteok[0];
-	fio.f_froute[1] = ipl_frouteok[1];
-	IWCOPY((caddr_t)&fio, data, sizeof(fio));
-	bzero((char *)frstats, sizeof(*frstats) * 2);
-}
-
-
-/*
- * Filter ioctl interface.
- */
-#ifdef __sgi
-int IPL_EXTERN(ioctl)(dev_t dev, int cmd, caddr_t data, int mode
-# ifdef _KERNEL
-	, cred_t *cp, int *rp
-# endif
-)
-#else
-int IPL_EXTERN(ioctl)(dev, cmd, data, mode
-#if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \
-     (__FreeBSD_version >= 220000)) && defined(_KERNEL)
-, p)
-struct proc *p;
-#else
-)
-#endif
-dev_t dev;
-#if defined(__NetBSD__) || defined(__OpenBSD__) || \
-    (_BSDI_VERSION >= 199701) || (__FreeBSD_version >= 300003)
-u_long cmd;
-#else
-int cmd;
-#endif
-caddr_t data;
-int mode;
-#endif /* __sgi */
-{
-#if defined(_KERNEL) && !SOLARIS
-	int s;
-#endif
-	int error = 0, unit = 0, tmp;
-
-#ifdef	_KERNEL
-	unit = GET_MINOR(dev);
-	if ((IPL_LOGMAX < unit) || (unit < 0))
-		return ENXIO;
-#endif
-
-	SPL_NET(s);
-
-	if (unit == IPL_LOGNAT) {
-		error = nat_ioctl(data, cmd, mode);
-		SPL_X(s);
-		return error;
-	}
-	if (unit == IPL_LOGSTATE) {
-		error = fr_state_ioctl(data, cmd, mode);
-		SPL_X(s);
-		return error;
-	}
-	switch (cmd) {
-	case FIONREAD :
-#ifdef IPFILTER_LOG
-		IWCOPY((caddr_t)&iplused[IPL_LOGIPF], (caddr_t)data,
-		       sizeof(iplused[IPL_LOGIPF]));
-#endif
-		break;
-#if !defined(IPFILTER_LKM) && defined(_KERNEL)
-	case SIOCFRENB :
-	{
-		u_int	enable;
-
-		if (!(mode & FWRITE))
-			error = EPERM;
-		else {
-			IRCOPY(data, (caddr_t)&enable, sizeof(enable));
-			if (enable)
-				error = iplattach();
-			else
-				error = ipldetach();
-		}
-		break;
-	}
-#endif
-	case SIOCSETFF :
-		if (!(mode & FWRITE))
-			error = EPERM;
-		else
-			IRCOPY(data, (caddr_t)&fr_flags, sizeof(fr_flags));
-		break;
-	case SIOCGETFF :
-		IWCOPY((caddr_t)&fr_flags, data, sizeof(fr_flags));
-		break;
-	case SIOCINAFR :
-	case SIOCRMAFR :
-	case SIOCADAFR :
-	case SIOCZRLST :
-		if (!(mode & FWRITE))
-			error = EPERM;
-		else
-			error = frrequest(unit, cmd, data, fr_active);
-		break;
-	case SIOCINIFR :
-	case SIOCRMIFR :
-	case SIOCADIFR :
-		if (!(mode & FWRITE))
-			error = EPERM;
-		else
-			error = frrequest(unit, cmd, data, 1 - fr_active);
-		break;
-	case SIOCSWAPA :
-		if (!(mode & FWRITE))
-			error = EPERM;
-		else {
-			bzero((char *)frcache, sizeof(frcache[0]) * 2);
-			*(u_int *)data = fr_active;
-			fr_active = 1 - fr_active;
-		}
-		break;
-	case SIOCGETFS :
-	{
-		struct	friostat	fio;
-
-		bcopy((char *)frstats, (char *)fio.f_st,
-			sizeof(struct filterstats) * 2);
-		fio.f_fin[0] = ipfilter[0][0];
-		fio.f_fin[1] = ipfilter[0][1];
-		fio.f_fout[0] = ipfilter[1][0];
-		fio.f_fout[1] = ipfilter[1][1];
-		fio.f_acctin[0] = ipacct[0][0];
-		fio.f_acctin[1] = ipacct[0][1];
-		fio.f_acctout[0] = ipacct[1][0];
-		fio.f_acctout[1] = ipacct[1][1];
-		fio.f_auth = ipauth;
-		fio.f_active = fr_active;
-		fio.f_froute[0] = ipl_frouteok[0];
-		fio.f_froute[1] = ipl_frouteok[1];
-		IWCOPY((caddr_t)&fio, data, sizeof(fio));
-		break;
-	}
-	case	SIOCFRZST :
-		if (!(mode & FWRITE))
-			error = EPERM;
-		else
-			frzerostats(data);
-		break;
-	case	SIOCIPFFL :
-		if (!(mode & FWRITE))
-			error = EPERM;
-		else {
-			IRCOPY(data, (caddr_t)&tmp, sizeof(tmp));
-			frflush(unit, &tmp);
-			IWCOPY((caddr_t)&tmp, data, sizeof(tmp));
-		}
-		break;
-#ifdef	IPFILTER_LOG
-	case	SIOCIPFFB :
-		if (!(mode & FWRITE))
-			error = EPERM;
-		else
-			*(int *)data = ipflog_clear(unit);
-		break;
-#endif /* IPFILTER_LOG */
-	case SIOCGFRST :
-		IWCOPY((caddr_t)ipfr_fragstats(), data, sizeof(ipfrstat_t));
-		break;
-	case SIOCAUTHW :
-	case SIOCAUTHR :
-		if (!(mode & FWRITE)) {
-			error = EPERM;
-			break;
-		}
-	case SIOCATHST :
-		error = fr_auth_ioctl(data, cmd, NULL, NULL);
-		break;
-	case SIOCFRSYN :
-		if (!(mode & FWRITE))
-			error = EPERM;
-		else {
-#if defined(_KERNEL) && defined(__sgi)
-			ipfsync();
-#endif
-			frsync();
-		}
-		break;
-	default :
-		error = EINVAL;
-		break;
-	}
-	SPL_X(s);
-	return error;
-}
-
-
-static void frsync()
-{
-#ifdef _KERNEL
-	struct ifnet *ifp;
-
-# if (__FreeBSD_version >= 300000)
-	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
-# elif defined(__OpenBSD__) || (NetBSD >= 199511)
-	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
-# else
-	for (ifp = ifnet; ifp; ifp = ifp->if_next)
-# endif
-		ip_natsync(ifp);
-#endif
-}
-
-
-static void fixskip(listp, rp, addremove)
-frentry_t **listp, *rp;
-int addremove;
-{
-	frentry_t *fp;
-	int rules = 0, rn = 0;
-
-	for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++)
-		;
-
-	if (!fp)
-		return;
-
-	for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
-		if (fp->fr_skip && (rn + fp->fr_skip >= rules))
-			fp->fr_skip += addremove;
-}
-
-
-static int frrequest(unit, req, data, set)
-int unit;
-#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
-u_long req;
-#else
-int req;
-#endif
-int set;
-caddr_t data;
-{
-	register frentry_t *fp, *f, **fprev;
-	register frentry_t **ftail;
-	frentry_t frd;
-	frdest_t *fdp;
-	frgroup_t *fg = NULL;
-	int error = 0, in, group;
-
-	fp = &frd;
-	IRCOPY(data, (caddr_t)fp, sizeof(*fp));
-
-	/*
-	 * Check that the group number does exist and that if a head group
-	 * has been specified, doesn't exist.
-	 */
-	if (fp->fr_grhead &&
-	    fr_findgroup(fp->fr_grhead, fp->fr_flags, unit, set, NULL))
-		return EEXIST;
-	if (fp->fr_group &&
-	    !fr_findgroup(fp->fr_group, fp->fr_flags, unit, set, NULL))
-		return ESRCH;
-
-	in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
-
-	if (unit == IPL_LOGAUTH)
-		ftail = fprev = &ipauth;
-	else if (fp->fr_flags & FR_ACCOUNT)
-		ftail = fprev = &ipacct[in][set];
-	else if (fp->fr_flags & (FR_OUTQUE|FR_INQUE))
-		ftail = fprev = &ipfilter[in][set];
-	else
-		return ESRCH;
-
-	if ((group = fp->fr_group)) {
-		if (!(fg = fr_findgroup(group, fp->fr_flags, unit, set, NULL)))
-			return ESRCH;
-		ftail = fprev = fg->fg_start;
-	}
-
-	bzero((char *)frcache, sizeof(frcache[0]) * 2);
-
-	if (*fp->fr_ifname) {
-		fp->fr_ifa = GETUNIT(fp->fr_ifname);
-		if (!fp->fr_ifa)
-			fp->fr_ifa = (void *)-1;
-	}
-
-	fdp = &fp->fr_dif;
-	fp->fr_flags &= ~FR_DUP;
-	if (*fdp->fd_ifname) {
-		fdp->fd_ifp = GETUNIT(fdp->fd_ifname);
-		if (!fdp->fd_ifp)
-			fdp->fd_ifp = (struct ifnet *)-1;
-		else
-			fp->fr_flags |= FR_DUP;
-	}
-
-	fdp = &fp->fr_tif;
-	if (*fdp->fd_ifname) {
-		fdp->fd_ifp = GETUNIT(fdp->fd_ifname);
-		if (!fdp->fd_ifp)
-			fdp->fd_ifp = (struct ifnet *)-1;
-	}
-
-	/*
-	 * Look for a matching filter rule, but don't include the next or
-	 * interface pointer in the comparison (fr_next, fr_ifa).
-	 */
-	for (; (f = *ftail); ftail = &f->fr_next)
-		if (bcmp((char *)&f->fr_ip, (char *)&fp->fr_ip,
-			 FR_CMPSIZ) == 0)
-			break;
-
-	/*
-	 * If zero'ing statistics, copy current to caller and zero.
-	 */
-	if (req == SIOCZRLST) {
-		if (!f)
-			return ESRCH;
-		IWCOPY((caddr_t)f, data, sizeof(*f));
-		f->fr_hits = 0;
-		f->fr_bytes = 0;
-		return 0;
-	}
-
-	if (!f) {
-		ftail = fprev;
-		if (req != SIOCINAFR && req != SIOCINIFR)
-			while ((f = *ftail))
-				ftail = &f->fr_next;
-		else if (fp->fr_hits)
-			while (--fp->fr_hits && (f = *ftail))
-				ftail = &f->fr_next;
-		f = NULL;
-	}
-
-	if (req == SIOCDELFR || req == SIOCRMIFR) {
-		if (!f)
-			error = ESRCH;
-		else {
-			if (f->fr_ref > 1)
-				return EBUSY;
-			if (fg && fg->fg_head)
-				fg->fg_head->fr_ref--;
-			if (unit == IPL_LOGAUTH)
-				return fr_auth_ioctl(data, req, f, ftail);
-			if (f->fr_grhead)
-				fr_delgroup(f->fr_grhead, fp->fr_flags, unit,
-					    set);
-			fixskip(fprev, f, -1);
-			*ftail = f->fr_next;
-			KFREE(f);
-		}
-	} else {
-		if (f)
-			error = EEXIST;
-		else {
-			if (unit == IPL_LOGAUTH)
-				return fr_auth_ioctl(data, req, f, ftail);
-			KMALLOC(f, frentry_t *, sizeof(*f));
-			if (f != NULL) {
-				if (fg && fg->fg_head)
-					fg->fg_head->fr_ref++;
-				bcopy((char *)fp, (char *)f, sizeof(*f));
-				f->fr_ref = 1;
-				f->fr_hits = 0;
-				f->fr_next = *ftail;
-				*ftail = f;
-				if (req == SIOCINIFR || req == SIOCINAFR)
-					fixskip(fprev, f, 1);
-				f->fr_grp = NULL;
-				if ((group = f->fr_grhead))
-					fg = fr_addgroup(group, f, unit, set);
-			} else
-				error = ENOMEM;
-		}
-	}
-	return (error);
-}
-
-
-#ifdef	_KERNEL
-/*
- * routines below for saving IP headers to buffer
- */
-#ifdef __sgi
-# ifdef _KERNEL
-int IPL_EXTERN(open)(dev_t *pdev, int flags, int devtype, cred_t *cp)
-# else
-int IPL_EXTERN(open)(dev_t dev, int flags)
-# endif
-#else
-int IPL_EXTERN(open)(dev, flags
-# if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \
-     (__FreeBSD_version >= 220000)) && defined(_KERNEL)
-, devtype, p)
-int devtype;
-struct proc *p;
-# else
-)
-# endif
-dev_t dev;
-int flags;
-#endif /* __sgi */
-{
-#if defined(__sgi) && defined(_KERNEL)
-	u_int min = geteminor(*pdev);
-#else
-	u_int min = GET_MINOR(dev);
-#endif
-
-	if (IPL_LOGMAX < min)
-		min = ENXIO;
-	else
-		min = 0;
-	return min;
-}
-
-
-#ifdef __sgi
-int IPL_EXTERN(close)(dev_t dev, int flags, int devtype, cred_t *cp)
-#else
-int IPL_EXTERN(close)(dev, flags
-# if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \
-     (__FreeBSD_version >= 220000)) && defined(_KERNEL)
-, devtype, p)
-int devtype;
-struct proc *p;
-# else
-)
-# endif
-dev_t dev;
-int flags;
-#endif /* __sgi */
-{
-	u_int	min = GET_MINOR(dev);
-
-	if (2 < min)
-		min = ENXIO;
-	else
-		min = 0;
-	return min;
-}
-
-/*
- * iplread/ipllog
- * both of these must operate with at least splnet() lest they be
- * called during packet processing and cause an inconsistancy to appear in
- * the filter lists.
- */
-#ifdef __sgi
-int IPL_EXTERN(read)(dev_t dev, uio_t *uio, cred_t *crp)
-#else
-#  if BSD >= 199306
-int IPL_EXTERN(read)(dev, uio, ioflag)
-int ioflag;
-#  else
-int IPL_EXTERN(read)(dev, uio)
-#  endif
-dev_t dev;
-register struct uio *uio;
-#endif /* __sgi */
-{
-#  ifdef IPFILTER_LOG
-	return ipflog_read(GET_MINOR(dev), uio);
-#  else
-	return ENXIO;
-#  endif
-}
-
-
-/*
- * send_reset - this could conceivably be a call to tcp_respond(), but that
- * requires a large amount of setting up and isn't any more efficient.
- */
-int send_reset(ti)
-struct tcpiphdr *ti;
-{
-	struct tcpiphdr *tp;
-	struct tcphdr *tcp;
-	struct mbuf *m;
-	int tlen = 0, err;
-	ip_t *ip;
-# if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
-	struct route ro;
-# endif
-
-	if (ti->ti_flags & TH_RST)
-		return -1;		/* feedback loop */
-# if	(BSD < 199306) || defined(__sgi)
-	m = m_get(M_DONTWAIT, MT_HEADER);
-# else
-	m = m_gethdr(M_DONTWAIT, MT_HEADER);
-	m->m_data += max_linkhdr;
-# endif
-	if (m == NULL)
-		return -1;
-
-	if (ti->ti_flags & TH_SYN)
-		tlen = 1;
-	m->m_len = sizeof (struct tcpiphdr);
-# if	BSD >= 199306
-	m->m_pkthdr.len = sizeof (struct tcpiphdr);
-	m->m_pkthdr.rcvif = (struct ifnet *)0;
-# endif
-	bzero(mtod(m, char *), sizeof(struct tcpiphdr));
-	ip = mtod(m, struct ip *);
-	tp = mtod(m, struct tcpiphdr *);
-	tcp = (struct tcphdr *)((char *)ip + sizeof(struct ip));
-
-	ip->ip_src.s_addr = ti->ti_dst.s_addr;
-	ip->ip_dst.s_addr = ti->ti_src.s_addr;
-	tcp->th_dport = ti->ti_sport;
-	tcp->th_sport = ti->ti_dport;
-	tcp->th_ack = htonl(ntohl(ti->ti_seq) + tlen);
-	tcp->th_off = sizeof(struct tcphdr) >> 2;
-	tcp->th_flags = TH_RST|TH_ACK;
-	tp->ti_pr = ((struct ip *)ti)->ip_p;
-	tp->ti_len = htons(sizeof(struct tcphdr));
-	tcp->th_sum = in_cksum(m, sizeof(struct tcpiphdr));
-
-	ip->ip_tos = ((struct ip *)ti)->ip_tos;
-	ip->ip_p = ((struct ip *)ti)->ip_p;
-	ip->ip_len = sizeof (struct tcpiphdr);
-# if (BSD < 199306) || defined(__sgi)
-	ip->ip_ttl = tcp_ttl;
-# else
-	ip->ip_ttl = ip_defttl;
-# endif
-
-# if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
-	bzero((char *)&ro, sizeof(ro));
-	err = ip_output(m, (struct mbuf *)0, &ro, 0, 0);
-	if (ro.ro_rt)
-		RTFREE(ro.ro_rt);
-# else
-	/*
-	 * extra 0 in case of multicast
-	 */
-	err = ip_output(m, (struct mbuf *)0, 0, 0, 0);
-# endif
-	return err;
-}
-
-
-# if !defined(IPFILTER_LKM) && (__FreeBSD_version < 300000) && !defined(__sgi)
-#  if	(BSD < 199306)
-int iplinit __P((void));
-
-int
-#  else
-void iplinit __P((void));
-
-void
-#  endif
-iplinit()
-{
-	(void) iplattach();
-	ip_init();
-}
-# endif /* ! __NetBSD__ */
-
-
-size_t mbufchainlen(m0)
-register struct mbuf *m0;
-{
-	register size_t len = 0;
-
-	for (; m0; m0 = m0->m_next)
-		len += m0->m_len;
-	return len;
-}
-
-
-void ipfr_fastroute(m0, fin, fdp)
-struct mbuf *m0;
-fr_info_t *fin;
-frdest_t *fdp;
-{
-	register struct ip *ip, *mhip;
-	register struct mbuf *m = m0;
-	register struct route *ro;
-	struct ifnet *ifp = fdp->fd_ifp;
-	int len, off, error = 0;
-	int hlen = fin->fin_hlen;
-	struct route iproute;
-	struct sockaddr_in *dst;
-
-	ip = mtod(m0, struct ip *);
-	/*
-	 * Route packet.
-	 */
-	ro = &iproute;
-	bzero((caddr_t)ro, sizeof (*ro));
-	dst = (struct sockaddr_in *)&ro->ro_dst;
-	dst->sin_family = AF_INET;
-	dst->sin_addr = fdp->fd_ip.s_addr ? fdp->fd_ip : ip->ip_dst;
-# ifdef	__bsdi__
-	dst->sin_len = sizeof(*dst);
-# endif
-# if	(BSD >= 199306) && !defined(__NetBSD__) && !defined(__bsdi__) && \
-	!defined(__OpenBSD__)
-# ifdef	RTF_CLONING
-	rtalloc_ign(ro, RTF_CLONING);
-#  else
-	rtalloc_ign(ro, RTF_PRCLONING);
-#  endif
-# else
-	rtalloc(ro);
-# endif
-	if (!ifp) {
-		if (!(fin->fin_fr->fr_flags & FR_FASTROUTE)) {
-			error = -2;
-			goto bad;
-		}
-		if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
-			if (in_localaddr(ip->ip_dst))
-				error = EHOSTUNREACH;
-			else
-				error = ENETUNREACH;
-			goto bad;
-		}
-		if (ro->ro_rt->rt_flags & RTF_GATEWAY)
-			dst = (struct sockaddr_in *)&ro->ro_rt->rt_gateway;
-	}
-	if (ro->ro_rt)
-		ro->ro_rt->rt_use++;
-
-	/*
-	 * For input packets which are being "fastrouted", they won't
-	 * go back through output filtering and miss their chance to get
-	 * NAT'd.
-	 */
-	(void) ip_natout(ip, hlen, fin);
-	if (fin->fin_out)
-		ip->ip_sum = 0;
-	/*
-	 * If small enough for interface, can just send directly.
-	 */
-	if (ip->ip_len <= ifp->if_mtu) {
-# ifndef sparc
-		ip->ip_id = htons(ip->ip_id);
-		ip->ip_len = htons(ip->ip_len);
-		ip->ip_off = htons(ip->ip_off);
-# endif
-		if (!ip->ip_sum)
-			ip->ip_sum = in_cksum(m, hlen);
-# if	BSD >= 199306
-		error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
-					  ro->ro_rt);
-# else
-		error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst);
-# endif
-		goto done;
-	}
-	/*
-	 * Too large for interface; fragment if possible.
-	 * Must be able to put at least 8 bytes per fragment.
-	 */
-	if (ip->ip_off & IP_DF) {
-		error = EMSGSIZE;
-		goto bad;
-	}
-	len = (ifp->if_mtu - hlen) &~ 7;
-	if (len < 8) {
-		error = EMSGSIZE;
-		goto bad;
-	}
-
-    {
-	int mhlen, firstlen = len;
-	struct mbuf **mnext = &m->m_act;
-
-	/*
-	 * Loop through length of segment after first fragment,
-	 * make new header and copy data of each part and link onto chain.
-	 */
-	m0 = m;
-	mhlen = sizeof (struct ip);
-	for (off = hlen + len; off < ip->ip_len; off += len) {
-		MGET(m, M_DONTWAIT, MT_HEADER);
-		if (m == 0) {
-			error = ENOBUFS;
-			goto bad;
-		}
-# if BSD >= 199306
-		m->m_data += max_linkhdr;
-# else
-		m->m_off = MMAXOFF - hlen;
-# endif
-		mhip = mtod(m, struct ip *);
-		bcopy((char *)ip, (char *)mhip, sizeof(*ip));
-		if (hlen > sizeof (struct ip)) {
-			mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
-			mhip->ip_hl = mhlen >> 2;
-		}
-		m->m_len = mhlen;
-		mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
-		if (ip->ip_off & IP_MF)
-			mhip->ip_off |= IP_MF;
-		if (off + len >= ip->ip_len)
-			len = ip->ip_len - off;
-		else
-			mhip->ip_off |= IP_MF;
-		mhip->ip_len = htons((u_short)(len + mhlen));
-		m->m_next = m_copy(m0, off, len);
-		if (m->m_next == 0) {
-			error = ENOBUFS;	/* ??? */
-			goto sendorfree;
-		}
-# ifndef sparc
-		mhip->ip_off = htons((u_short)mhip->ip_off);
-# endif
-		mhip->ip_sum = 0;
-		mhip->ip_sum = in_cksum(m, mhlen);
-		*mnext = m;
-		mnext = &m->m_act;
-	}
-	/*
-	 * Update first fragment by trimming what's been copied out
-	 * and updating header, then send each fragment (in order).
-	 */
-	m_adj(m0, hlen + firstlen - ip->ip_len);
-	ip->ip_len = htons((u_short)(hlen + firstlen));
-	ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
-	ip->ip_sum = 0;
-	ip->ip_sum = in_cksum(m0, hlen);
-sendorfree:
-	for (m = m0; m; m = m0) {
-		m0 = m->m_act;
-		m->m_act = 0;
-		if (error == 0)
-# if BSD >= 199306
-			error = (*ifp->if_output)(ifp, m,
-			    (struct sockaddr *)dst, ro->ro_rt);
-# else
-			error = (*ifp->if_output)(ifp, m,
-			    (struct sockaddr *)dst);
-# endif
-		else
-			m_freem(m);
-	}
-    }	
-done:
-	if (!error)
-		ipl_frouteok[0]++;
-	else
-		ipl_frouteok[1]++;
-
-	if (ro->ro_rt) {
-		RTFREE(ro->ro_rt);
-	}
-	return;
-bad:
-	m_freem(m);
-	goto done;
-}
-#else /* #ifdef _KERNEL */
-
-
-#ifdef __sgi
-static int no_output __P((struct ifnet *ifp, struct mbuf *m,
-			   struct sockaddr *s))
-#else
-static int no_output __P((struct ifnet *ifp, struct mbuf *m,
-			   struct sockaddr *s, struct rtentry *rt))
-#endif
-{
-	return 0;
-}
-
-
-# ifdef __STDC__
-#ifdef __sgi
-static int write_output __P((struct ifnet *ifp, struct mbuf *m,
-			     struct sockaddr *s))
-#else
-static int write_output __P((struct ifnet *ifp, struct mbuf *m,
-			     struct sockaddr *s, struct rtentry *rt))
-#endif
-{
-# if !(defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
-	(defined(OpenBSD) && (OpenBSD >= 199603))
-	ip_t *ip = (ip_t *)m;
-#  endif
-# else
-static int write_output(ifp, ip)
-struct ifnet *ifp;
-ip_t *ip;
-{
-# endif
-	FILE *fp;
-	char fname[32];
-
-# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
-	(defined(OpenBSD) && (OpenBSD >= 199603))
-	snprintf(fname, sizeof(fname), "/tmp/%s", ifp->if_xname);
-	if ((fp = fopen(fname, "a"))) {
-		fclose(fp);
-	}
-# else
-	snprintf(fname, sizeof(fname), "/tmp/%s%d", ifp->if_name, ifp->if_unit);
-	if ((fp = fopen(fname, "a"))) {
-		fwrite((char *)ip, ntohs(ip->ip_len), 1, fp);
-		fclose(fp);
-	}
-# endif
-	return 0;
-}
-
-
-struct ifnet *get_unit(name)
-char *name;
-{
-	struct ifnet *ifp, **ifa;
-# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
-	(defined(OpenBSD) && (OpenBSD >= 199603))
-	for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
-		if (!strcmp(name, ifp->if_xname))
-			return ifp;
-	}
-# else
-	char ifname[32], *s;
-
-	for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
-		(void) snprintf(ifname, sizeof(ifname),
-			"%s%d", ifp->if_name, ifp->if_unit);
-		if (!strcmp(name, ifname))
-			return ifp;
-	}
-# endif
-
-	if (!ifneta) {
-		ifneta = (struct ifnet **)malloc(sizeof(ifp) * 2);
-		ifneta[1] = NULL;
-		ifneta[0] = (struct ifnet *)calloc(1, sizeof(*ifp));
-		nifs = 1;
-	} else {
-		nifs++;
-		ifneta = (struct ifnet **)realloc(ifneta,
-						  (nifs + 1) * sizeof(*ifa));
-		ifneta[nifs] = NULL;
-		ifneta[nifs - 1] = (struct ifnet *)malloc(sizeof(*ifp));
-	}
-	ifp = ifneta[nifs - 1];
-
-# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
-	(defined(OpenBSD) && (OpenBSD >= 199603))
-	strncpy(ifp->if_xname, name, sizeof(ifp->if_xname));
-# else
-	for (s = name; *s && !isdigit(*s); s++)
-		;
-	if (*s && isdigit(*s)) {
-		ifp->if_unit = atoi(s);
-		ifp->if_name = (char *)malloc(s - name + 1);
-		strncpy(ifp->if_name, name, s - name);
-		ifp->if_name[s - name] = '\0';
-	} else {
-		ifp->if_name = strdup(name);
-		ifp->if_unit = -1;
-	}
-# endif
-	ifp->if_output = no_output;
-	return ifp;
-}
-
-
-
-void init_ifp()
-{
-	FILE *fp;
-	struct ifnet *ifp, **ifa;
-	char fname[32];
-# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
-	(defined(OpenBSD) && (OpenBSD >= 199603))
-	for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
-		ifp->if_output = write_output;
-		snprintf(fname, sizeof(fname), "/tmp/%s", ifp->if_xname);
-		if ((fp = fopen(fname, "w")))
-			fclose(fp);
-	}
-# else
-
-	for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
-		ifp->if_output = write_output;
-		snprintf(fname, sizeof(fname),
-		    "/tmp/%s%d", ifp->if_name, ifp->if_unit);
-		if ((fp = fopen(fname, "w")))
-			fclose(fp);
-	}
-# endif
-}
-
-
-void ipfr_fastroute(ip, fin, fdp)
-ip_t *ip;
-fr_info_t *fin;
-frdest_t *fdp;
-{
-	struct ifnet *ifp = fdp->fd_ifp;
-
-	if (!ifp)
-		return;	/* no routing table out here */
-
-	ip->ip_len = htons((u_short)ip->ip_len);
-	ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
-	ip->ip_sum = 0;
-#ifdef __sgi
-	(*ifp->if_output)(ifp, (void *)ip, NULL);
-#else
-	(*ifp->if_output)(ifp, (void *)ip, NULL, 0);
-#endif
-}
-
-
-int ipllog __P((void))
-{
-	verbose("l");
-	return 0;
-}
-
-
-int send_reset(ip, ifp)
-ip_t *ip;
-struct ifnet *ifp;
-{
-	verbose("- TCP RST sent\n");
-	return 0;
-}
-
-
-int icmp_error(ip, ifp)
-ip_t *ip;
-struct ifnet *ifp;
-{
-	verbose("- TCP RST sent\n");
-	return 0;
-}
-#endif /* _KERNEL */