Add kernel parts of revived ipfilter (3.3.3.)

1 files changed, 1471 insertions, 0 deletions

diff --git a/sys/netinet/ip_fil.c b/sys/netinet/ip_fil.c
new file mode 100644
index 000000000000..f4da3c3af80e
--- /dev/null
+++ b/sys/netinet/ip_fil.c
@@ -0,0 +1,1471 @@
+/*
+ * Copyright (C) 1993-1998 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[] = "@(#)$Id: ip_fil.c,v 2.4.2.7 1999/10/15 13:49:43 darrenr Exp $";*/
+static const char rcsid[] = "@(#)$FreeBSD$";
+#endif
+
+#ifndef	SOLARIS
+#define	SOLARIS	(defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+#endif
+
+#if defined(KERNEL) && !defined(_KERNEL)
+# define	_KERNEL
+#endif
+#include <sys/param.h>
+#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
+    defined(_KERNEL)
+# include "opt_ipfilter_log.h"
+#endif
+#ifdef	__FreeBSD__
+# if !defined(_KERNEL) || defined(IPFILTER_LKM)
+#  include <osreldate.h>
+# endif
+#endif
+#ifndef	_KERNEL
+# include <stdio.h>
+# include <string.h>
+# include <stdlib.h>
+# include <ctype.h>
+# include <fcntl.h>
+#endif
+#include <sys/errno.h>
+#include <sys/types.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 >= 300000)
+#  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>
+# if defined(_KERNEL) && !defined(IPFILTER_LKM)
+#  include "opt_ipfilter.h"
+# endif
+#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 <unistd.h>
+# 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"
+#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
+# include <sys/malloc.h>
+#endif
+#ifndef	MIN
+# define	MIN(a,b)	(((a)<(b))?(a):(b))
+#endif
+#if !SOLARIS && defined(_KERNEL) && !defined(__sgi)
+# include <sys/kernel.h>
+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)
+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	frzerostats __P((caddr_t));
+#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 **));
+static	int	send_ip __P((struct mbuf *, ip_t *));
+# ifdef	__sgi
+extern  kmutex_t        ipf_rw;
+# endif
+#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 defined(IPFILTER_LKM)
+int	fr_running = 1;
+#else
+int	fr_running = 0;
+#endif
+
+#if (__FreeBSD_version >= 300000) && defined(_KERNEL)
+struct callout_handle ipfr_slowtimer_ch;
+#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;
+{
+	if (iplattach() != 0)
+		printf("IP Filter failed to attach\n");
+}
+# 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	IPFILTER_LOG
+	ipflog_init();
+# endif
+	if (nat_init() == -1)
+		return -1;
+	if (fr_stateinit() == -1)
+		return -1;
+	if (appr_init() == -1)
+		return -1;
+
+# 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));
+	fr_savep = fr_checkp;
+	fr_checkp = fr_check;
+
+	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
+	printf("%s\n", ipfilter_version);
+#ifdef	_KERNEL
+# if (__FreeBSD_version >= 300000) && defined(_KERNEL)
+	ipfr_slowtimer_ch = timeout(ipfr_slowtimer, NULL, hz/2);
+# else
+	timeout(ipfr_slowtimer, NULL, hz/2);
+# endif
+#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;
+
+#ifdef	_KERNEL
+# if (__FreeBSD_version >= 300000)
+	untimeout(ipfr_slowtimer, NULL, ipfr_slowtimer_ch);
+# else
+#  ifdef __sgi
+	untimeout(ipfr_slowtimer);
+#  else
+	untimeout(ipfr_slowtimer, NULL);
+#  endif
+# endif
+#endif
+	SPL_NET(s);
+	if (!ipl_inited)
+	{
+		printf("IP Filter: not initialized\n");
+		SPL_X(s);
+		return 0;
+	}
+
+	printf("IP Filter: unloaded\n");
+
+	fr_checkp = fr_savep;
+	i = 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;
+{
+	friostat_t 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(__OpenBSD__)) && defined(_KERNEL)
+, p)
+struct proc *p;
+#else
+)
+#endif
+dev_t dev;
+#if defined(__NetBSD__) || defined(__OpenBSD__) || \
+	 (_BSDI_VERSION >= 199701) || (__FreeBSD_version >= 300000)
+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;
+
+#if (BSD >= 199306) && defined(_KERNEL)
+	if ((securelevel >= 2) && (mode & FWRITE))
+		return EPERM;
+#endif
+#ifdef	_KERNEL
+	unit = GET_MINOR(dev);
+	if ((IPL_LOGMAX < unit) || (unit < 0))
+		return ENXIO;
+#else
+	unit = dev;
+#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();
+				if (error == 0)
+					fr_running = 1;
+			} else {
+				error = ipldetach();
+				if (error == 0)
+					fr_running = 0;
+			}
+		}
+		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];
+		fio.f_running = fr_running;
+		fio.f_groups[0][0] = ipfgroups[0][0];
+		fio.f_groups[0][1] = ipfgroups[0][1];
+		fio.f_groups[1][0] = ipfgroups[1][0];
+		fio.f_groups[1][1] = ipfgroups[1][1];
+		fio.f_groups[2][0] = ipfgroups[2][0];
+		fio.f_groups[2][1] = ipfgroups[2][1];
+#ifdef	IPFILTER_LOG
+		fio.f_logging = 1;
+#else
+		fio.f_logging = 0;
+#endif
+		fio.f_defpass = fr_pass;
+		strncpy(fio.f_version, ipfilter_version,
+			sizeof(fio.f_version));
+		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));
+			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;
+}
+
+
+void frsync()
+{
+#ifdef _KERNEL
+	register frentry_t *f;
+	register struct ifnet *ifp;
+
+# if defined(__OpenBSD__) || ((NetBSD >= 199511) && (NetBSD < 1991011)) || \
+     (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
+#  if (NetBSD >= 199905) || defined(__OpenBSD__)
+	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
+#  else
+	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
+#  endif
+# else
+	for (ifp = ifnet; ifp; ifp = ifp->if_next)
+# endif
+		ip_natsync(ifp);
+
+	WRITE_ENTER(&ipf_mutex);
+	for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == (void *)-1)
+			f->fr_ifa = GETUNIT(f->fr_ifname);
+	for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == (void *)-1)
+			f->fr_ifa = GETUNIT(f->fr_ifname);
+	for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == (void *)-1)
+			f->fr_ifa = GETUNIT(f->fr_ifname);
+	for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == (void *)-1)
+			f->fr_ifa = GETUNIT(f->fr_ifname);
+	RWLOCK_EXIT(&ipf_mutex);
+#endif
+}
+
+
+void fr_forgetifp(ifp)
+void *ifp;
+{
+	register frentry_t *f;
+
+	WRITE_ENTER(&ipf_mutex);
+	for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == ifp)
+			f->fr_ifa = (void *)-1;
+	for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == ifp)
+			f->fr_ifa = (void *)-1;
+	for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == ifp)
+			f->fr_ifa = (void *)-1;
+	for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == ifp)
+			f->fr_ifa = (void *)-1;
+	RWLOCK_EXIT(&ipf_mutex);
+	ip_natsync(ifp);
+}
+
+
+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;
+	u_int group;
+
+	fp = &frd;
+	IRCOPY(data, (caddr_t)fp, sizeof(*fp));
+	fp->fr_ref = 0;
+
+	/*
+	 * Check that the group number does exist and that if a head group
+	 * has been specified, doesn't exist.
+	 */
+	if ((req != SIOCZRLST) && fp->fr_grhead &&
+	    fr_findgroup((u_int)fp->fr_grhead, fp->fr_flags, unit, set, NULL))
+		return EEXIST;
+	if ((req != SIOCZRLST) && fp->fr_group &&
+	    !fr_findgroup((u_int)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;
+	}
+#if BSD >= 199306
+	if (*fp->fr_oifname) {
+		fp->fr_oifa = GETUNIT(fp->fr_oifname);
+		if (!fp->fr_oifa)
+			fp->fr_oifa = (void *)-1;
+	}
+#endif
+
+	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((u_int)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 *);
+			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(__OpenBSD__)) && 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(__OpenBSD__)) && 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 (IPL_LOGMAX < 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(fin, oip)
+fr_info_t *fin;
+struct ip *oip;
+{
+	struct tcphdr *tcp, *tcp2;
+	struct tcpiphdr *tp;
+	struct mbuf *m;
+	int tlen = 0;
+	ip_t *ip;
+
+	tcp = (struct tcphdr *)fin->fin_dp;
+	if (tcp->th_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);
+# endif
+	if (m == NULL)
+		return ENOBUFS;
+	if (m == NULL)
+		return -1;
+
+	if (tcp->th_flags & TH_SYN)
+		tlen = 1;
+	m->m_len = sizeof(*tcp2) + sizeof(*ip);
+# if	BSD >= 199306
+	m->m_data += max_linkhdr;
+	m->m_pkthdr.len = m->m_len;
+	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 *);
+	tcp2 = (struct tcphdr *)((char *)ip + sizeof(*ip));
+
+	ip->ip_src.s_addr = oip->ip_dst.s_addr;
+	ip->ip_dst.s_addr = oip->ip_src.s_addr;
+	tcp2->th_dport = tcp->th_sport;
+	tcp2->th_sport = tcp->th_dport;
+	tcp2->th_ack = ntohl(tcp->th_seq);
+	tcp2->th_ack += tlen;
+	tcp2->th_ack = htonl(tcp2->th_ack);
+	tcp2->th_off = sizeof(*tcp2) >> 2;
+	tcp2->th_flags = TH_RST|TH_ACK;
+	tp->ti_pr = oip->ip_p;
+	tp->ti_len = htons(sizeof(struct tcphdr));
+	tcp2->th_sum = in_cksum(m, sizeof(*ip) + sizeof(*tcp2));
+
+	ip->ip_tos = oip->ip_tos;
+	ip->ip_p = oip->ip_p;
+	ip->ip_len = sizeof(*ip) + sizeof(*tcp2);
+
+	return send_ip(m, ip);
+}
+
+
+static int send_ip(m, ip)
+struct mbuf *m;
+ip_t *ip;
+{
+# if (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)) || \
+     (defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199802))
+	struct route ro;
+# endif
+
+# if (BSD < 199306) || defined(__sgi)
+	ip->ip_ttl = tcp_ttl;
+# else
+	ip->ip_ttl = ip_defttl;
+# endif
+
+# if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
+	{
+	int err;
+
+	bzero((char *)&ro, sizeof(ro));
+	err = ip_output(m, (struct mbuf *)0, &ro, 0, 0);
+	if (ro.ro_rt)
+		RTFREE(ro.ro_rt);
+	return err;
+	}
+# else
+	/*
+	 * extra 0 in case of multicast
+	 */
+#  if _BSDI_VERSION >= 199802
+	return ip_output(m, (struct mbuf *)0, &ro, 0, 0, NULL);
+#  else
+	return ip_output(m, (struct mbuf *)0, 0, 0, 0);
+#  endif
+# endif
+}
+
+
+int send_icmp_err(oip, type, code, ifp, dst)
+ip_t *oip;
+int type, code;
+void *ifp;
+struct in_addr	dst;
+{
+	struct icmp *icmp;
+	struct mbuf *m;
+	ip_t *nip;
+
+# if	(BSD < 199306) || defined(__sgi)
+	m = m_get(M_DONTWAIT, MT_HEADER);
+# else
+	m = m_gethdr(M_DONTWAIT, MT_HEADER);
+# endif
+	if (m == NULL)
+		return ENOBUFS;
+	m->m_len = sizeof(*nip) + sizeof(*icmp) + 8;
+# if	BSD >= 199306
+	m->m_data += max_linkhdr;
+	m->m_pkthdr.len = sizeof(*nip) + sizeof(*icmp) + 8;
+	m->m_pkthdr.rcvif = (struct ifnet *)0;
+# endif
+
+	bzero(mtod(m, char *), (size_t)sizeof(*nip) + sizeof(*icmp) + 8);
+	nip = mtod(m, ip_t *);
+	icmp = (struct icmp *)(nip + 1);
+
+	nip->ip_v = IPVERSION;
+	nip->ip_hl = (sizeof(*nip) >> 2);
+	nip->ip_p = IPPROTO_ICMP;
+	nip->ip_id = oip->ip_id;
+	nip->ip_sum = 0;
+	nip->ip_ttl = 60;
+	nip->ip_tos = oip->ip_tos;
+	nip->ip_len = sizeof(*nip) + sizeof(*icmp) + 8;
+	if (dst.s_addr == 0) {
+		if (fr_ifpaddr(ifp, &dst) == -1)
+			return -1;
+		dst.s_addr = htonl(dst.s_addr);
+	}
+	nip->ip_src = dst;
+	nip->ip_dst = oip->ip_src;
+
+	icmp->icmp_type = type;
+	icmp->icmp_code = code;
+	icmp->icmp_cksum = 0;
+	bcopy((char *)oip, (char *)&icmp->icmp_ip, sizeof(*oip));
+	bcopy((char *)oip + (oip->ip_hl << 2),
+	      (char *)&icmp->icmp_ip + sizeof(*oip), 8);	/* 64 bits */
+# ifndef	sparc
+	{
+	register u_short	__iplen, __ipoff;
+	ip_t *ip = &icmp->icmp_ip;
+
+	__iplen = ip->ip_len;
+	__ipoff = ip->ip_off;
+	ip->ip_len = htons(__iplen);
+	ip->ip_off = htons(__ipoff);
+	}
+# endif
+	icmp->icmp_cksum = ipf_cksum((u_short *)icmp, sizeof(*icmp) + 8);
+	return send_ip(m, nip);
+}
+
+
+# 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()
+{
+	if (iplattach() != 0)
+		printf("IP Filter failed to attach\n");
+	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;
+}
+
+
+int 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;
+	int len, off, error = 0, hlen;
+	struct sockaddr_in *dst;
+	struct route iproute;
+	struct ifnet *ifp;
+	frentry_t *fr;
+
+	hlen = fin->fin_hlen;
+	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;
+
+	fr = fin->fin_fr;
+	ifp = fdp->fd_ifp;
+	/*
+	 * In case we're here due to "to <if>" being used with "keep state",
+	 * check that we're going in the correct direction.
+	 */
+	if ((fr != NULL) && (ifp != NULL) && (fin->fin_rev != 0) &&
+	    (fdp == &fr->fr_tif))
+		return -1;
+# 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 and counted.
+	 */
+	fin->fin_ifp = ifp;
+	if (fin->fin_out == 0) {
+		fin->fin_out = 1;
+		if ((fin->fin_fr = ipacct[1][fr_active]) &&
+		    (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
+			ATOMIC_INC(frstats[1].fr_acct);
+		}
+		fin->fin_fr = NULL;
+		(void) fr_checkstate(ip, fin);
+		(void) ip_natout(ip, fin);
+	} else
+		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) {
+# ifdef	MGETHDR
+		MGETHDR(m, M_DONTWAIT, MT_HEADER);
+# else
+		MGET(m, M_DONTWAIT, MT_HEADER);
+# endif
+		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 0;
+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
+{
+	ip_t *ip = (ip_t *)m;
+# else
+static int write_output(ifp, ip)
+struct ifnet *ifp;
+ip_t *ip;
+{
+# endif
+	char fname[32];
+	int fd;
+
+# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
+	(defined(OpenBSD) && (OpenBSD >= 199603))
+	snprintf(fname, sizeof(fname), "/tmp/%s", ifp->if_xname);
+# else
+	snprintf(fname, sizeof(fname), "/tmp/%s%d", ifp->if_name, ifp->if_unit);
+# endif
+	fd = open(fname, O_WRONLY|O_APPEND);
+	if (fd == -1) {
+		perror("open");
+		return -1;
+	}
+	write(fd, (char *)ip, ntohs(ip->ip_len));
+	close(fd);
+	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()
+{
+	struct ifnet *ifp, **ifa;
+	char fname[32];
+	int fd;
+
+# 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);
+		fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, 0600);
+		if (fd == -1)
+			perror("open");
+		else
+			close(fd);
+	}
+# 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);
+		fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, 0600);
+		if (fd == -1)
+			perror("open");
+		else
+			close(fd);
+	}
+# endif
+}
+
+
+int ipfr_fastroute(ip, fin, fdp)
+ip_t *ip;
+fr_info_t *fin;
+frdest_t *fdp;
+{
+	struct ifnet *ifp = fdp->fd_ifp;
+
+	if (!ifp)
+		return 0;	/* 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
+	return 0;
+}
+
+
+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 */