ip_log.c - net/ipfilter - Rivoreo Source Code Repositories

 /*
  * Copyright (C) 1997-2003 by Darren Reed.
  *
  * See the IPFILTER.LICENCE file for details on licencing.
  *
  * $Id$
  */
 #include <sys/param.h>
 #if defined(KERNEL) || defined(_KERNEL)
 # undef KERNEL
 # undef _KERNEL
 # define        KERNEL	1
 # define        _KERNEL	1
 #endif
 #if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
     defined(_KERNEL)
 # if (__NetBSD_Version__ < 399001400)
 #  include "opt_ipfilter_log.h"
 # else
 #  include "opt_ipfilter.h"
 # endif
 #endif
 #if defined(__FreeBSD__) && !defined(IPFILTER_LKM)
 # if defined(_KERNEL)
 #  if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
 #   include "opt_ipfilter.h"
 #  endif
 # else
 #  include <osreldate.h>
 # endif
 #endif
 #ifndef SOLARIS
 # define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
 #endif
 #include <sys/errno.h>
 #include <sys/types.h>
 #include <sys/file.h>
 #ifndef _KERNEL
 # include <stdio.h>
 # include <string.h>
 # include <stdlib.h>
 # include <ctype.h>
 # define _KERNEL
 # define KERNEL
 # ifdef __OpenBSD__
 struct file;
 # endif
 # include <sys/uio.h>
 # undef _KERNEL
 # undef KERNEL
 #endif
 #if (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)) && \
     defined(_KERNEL)
 # include <sys/fcntl.h>
 # include <sys/filio.h>
 #else
 # include <sys/ioctl.h>
 #endif
 #include <sys/time.h>
 #if defined(_KERNEL)
 # include <sys/systm.h>
 # if (defined(NetBSD) && (__NetBSD_Version__ >= 104000000))
 #  include <sys/proc.h>
 # endif
 #endif /* _KERNEL */
 #if !SOLARIS && !defined(__hpux) && !defined(linux)
 # if (defined(NetBSD) && (NetBSD > 199609)) || \
      (defined(OpenBSD) && (OpenBSD > 199603)) || \
      (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
 #  include <sys/dirent.h>
 # else
 #  include <sys/dir.h>
 # endif
 # include <sys/mbuf.h>
 # include <sys/select.h>
 # if __FreeBSD_version >= 500000
 #  include <sys/selinfo.h>
 # endif
 #else
 # if !defined(__hpux) && defined(_KERNEL)
 #  include <sys/filio.h>
 #  include <sys/cred.h>
 #  include <sys/ddi.h>
 #  include <sys/sunddi.h>
 #  include <sys/ksynch.h>
 #  include <sys/kmem.h>
 #  include <sys/mkdev.h>
 #  include <sys/dditypes.h>
 #  include <sys/cmn_err.h>
 # endif /* !__hpux */
 #endif /* !SOLARIS && !__hpux */
 #if !defined(linux)
 # include <sys/protosw.h>
 #endif
 #include <sys/socket.h>

 #include <net/if.h>
 #ifdef sun
 # include <net/af.h>
 #endif
 #if __FreeBSD_version >= 300000
 # include <net/if_var.h>
 #endif
 #include <net/route.h>
 #include <netinet/in.h>
 #ifdef __sgi
 # include <sys/ddi.h>
 # ifdef IFF_DRVRLOCK /* IRIX6 */
 #  include <sys/hashing.h>
 # endif
 #endif
 #if !defined(__hpux) && !defined(linux) && \
     !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /*IRIX<6*/
 # include <netinet/in_var.h>
 #endif
 #include <netinet/in_systm.h>
 #include <netinet/ip.h>
 #include <netinet/tcp.h>
 #include <netinet/udp.h>
 #include <netinet/ip_icmp.h>
 #ifdef USE_INET6
 # include <netinet/icmp6.h>
 #endif
 #if !defined(linux)
 # include <netinet/ip_var.h>
 #endif
 #ifndef _KERNEL
 # include <syslog.h>
 #endif
 #include "netinet/ip_compat.h"
 #include <netinet/tcpip.h>
 #include "netinet/ip_fil.h"
 #include "netinet/ip_nat.h"
 #include "netinet/ip_frag.h"
 #include "netinet/ip_state.h"
 #include "netinet/ip_auth.h"
 #if (__FreeBSD_version >= 300000) || defined(__NetBSD__)
 # include <sys/malloc.h>
 #endif
 /* END OF INCLUDES */

 #ifdef	IPFILTER_LOG

 # if defined(IPL_SELECT)
 #  include	<machine/sys/user.h>
 #  include	<sys/kthread_iface.h>
 #  define	READ_COLLISION	0x001

 iplog_select_t	iplog_ss[IPL_LOGMAX+1];

 extern int selwait;
 # endif /* IPL_SELECT */

 # if defined(linux) && defined(_KERNEL)
 wait_queue_head_t	iplh_linux[IPL_LOGSIZE];
 # endif
 # if SOLARIS && defined(_KERNEL)
 extern	kcondvar_t	iplwait;
 extern	struct pollhead	iplpollhead[IPL_LOGSIZE];
 # endif

 iplog_t	**iplh[IPL_LOGSIZE], *iplt[IPL_LOGSIZE], *ipll[IPL_LOGSIZE];
 int	iplused[IPL_LOGSIZE];
 static fr_info_t	iplcrc[IPL_LOGSIZE];
 int	ipl_suppress = 1;
 int	ipl_logmax = IPL_LOGMAX;
 int	ipl_logall = 0;
 int	ipl_log_init = 0;
 int	ipl_logsize = IPFILTER_LOGSIZE;
 int	ipl_magic[IPL_LOGSIZE] = { IPL_MAGIC, IPL_MAGIC_NAT, IPL_MAGIC_STATE,
 				   IPL_MAGIC, IPL_MAGIC, IPL_MAGIC,
 				   IPL_MAGIC, IPL_MAGIC };


 /* ------------------------------------------------------------------------ */
 /* Function:    ipf_log_init                                                */
 /* Returns:     int - 0 == success (always returned)                        */
 /* Parameters:  Nil                                                         */
 /*                                                                          */
 /* Initialise log buffers & pointers.  Also iniialised the CRC to a local   */
 /* secret for use in calculating the "last log checksum".                   */
 /* ------------------------------------------------------------------------ */
 int
 ipf_log_init()
 {
 	int	i;

 	for (i = IPL_LOGMAX; i >= 0; i--) {
 		iplt[i] = NULL;
 		ipll[i] = NULL;
 		iplh[i] = &iplt[i];
 		iplused[i] = 0;
 		bzero((char *)&iplcrc[i], sizeof(iplcrc[i]));
 # ifdef	IPL_SELECT
 		iplog_ss[i].read_waiter = 0;
 		iplog_ss[i].state = 0;
 # endif
 # if defined(linux) && defined(_KERNEL)
 		init_waitqueue_head(iplh_linux + i);
 # endif
 	}

 # if SOLARIS && defined(_KERNEL)
 	cv_init(&iplwait, "ipl condvar", CV_DRIVER, NULL);
 # endif
 	MUTEX_INIT(&ipl_mutex, "ipf log mutex");

 	ipl_log_init = 1;

 	return 0;
 }


 /* ------------------------------------------------------------------------ */
 /* Function:    ipf_log_unload                                              */
 /* Returns:     Nil                                                         */
 /* Parameters:  Nil                                                         */
 /*                                                                          */
 /* Clean up any log data that has accumulated without being read.           */
 /* ------------------------------------------------------------------------ */
 void
 ipf_log_unload()
 {
 	int i;

 	if (ipl_log_init == 0)
 		return;

 	for (i = IPL_LOGMAX; i >= 0; i--)
 		(void) ipf_log_clear(i);

 # if SOLARIS && defined(_KERNEL)
 	cv_destroy(&iplwait);
 # endif
 	MUTEX_DESTROY(&ipl_mutex);

 	ipl_log_init = 0;
 }


 /* ------------------------------------------------------------------------ */
 /* Function:    ipf_log_pkt                                                 */
 /* Returns:     int - 0 == success, -1 == failure                           */
 /* Parameters:  fin(I)   - pointer to packet information                    */
 /*              flags(I) - flags from filter rules                          */
 /*                                                                          */
 /* Create a log record for a packet given that it has been triggered by a   */
 /* rule (or the default setting).  Calculate the transport protocol header  */
 /* size using predetermined size of a couple of popular protocols and thus  */
 /* how much data to copy into the log, including part of the data body if   */
 /* requested.                                                               */
 /* ------------------------------------------------------------------------ */
 int
 ipf_log_pkt(fin, flags)
 	fr_info_t *fin;
 	u_int flags;
 {
 	register size_t hlen;
 	int types[2], mlen;
 	size_t sizes[2];
 	void *ptrs[2];
 	ipflog_t ipfl;
 	u_char p;
 	mb_t *m;
 # if (SOLARIS || defined(__hpux)) && defined(_KERNEL)
 	qif_t *ifp;
 # else
 	struct ifnet *ifp;
 # endif /* SOLARIS || __hpux */

 	m = fin->fin_m;
 	if (m == NULL)
 		return -1;

 	ipfl.fl_nattag.ipt_num[0] = 0;
 	ifp = fin->fin_ifp;
 	hlen = (char *)fin->fin_dp - (char *)fin->fin_ip;

 	/*
 	 * calculate header size.
 	 */
 	if (fin->fin_off == 0) {
 		p = fin->fin_fi.fi_p;
 		if (p == IPPROTO_TCP)
 			hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen);
 		else if (p == IPPROTO_UDP)
 			hlen += MIN(sizeof(udphdr_t), fin->fin_dlen);
 		else if (p == IPPROTO_ICMP) {
 			struct icmp *icmp;

 			icmp = (struct icmp *)fin->fin_dp;

 			/*
 			 * For ICMP, if the packet is an error packet, also
 			 * include the information about the packet which
 			 * caused the error.
 			 */
 			switch (icmp->icmp_type)
 			{
 			case ICMP_UNREACH :
 			case ICMP_SOURCEQUENCH :
 			case ICMP_REDIRECT :
 			case ICMP_TIMXCEED :
 			case ICMP_PARAMPROB :
 				hlen += MIN(sizeof(struct icmp) + 8,
 					    fin->fin_dlen);
 				break;
 			default :
 				hlen += MIN(sizeof(struct icmp),
 					    fin->fin_dlen);
 				break;
 			}
 		}
 # ifdef USE_INET6
 		else if (p == IPPROTO_ICMPV6) {
 			struct icmp6_hdr *icmp;

 			icmp = (struct icmp6_hdr *)fin->fin_dp;

 			/*
 			 * For ICMPV6, if the packet is an error packet, also
 			 * include the information about the packet which
 			 * caused the error.
 			 */
 			if (icmp->icmp6_type < 128) {
 				hlen += MIN(sizeof(struct icmp6_hdr) + 8,
 					    fin->fin_dlen);
 			} else {
 				hlen += MIN(sizeof(struct icmp6_hdr),
 					    fin->fin_dlen);
 			}
 		}
 # endif
 	}
 	/*
 	 * Get the interface number and name to which this packet is
 	 * currently associated.
 	 */
 # if (SOLARIS || defined(__hpux)) && defined(_KERNEL)
 	ipfl.fl_unit = (u_int)ifp->qf_ppa;
 	COPYIFNAME(ifp, ipfl.fl_ifname);
 # else
 #  if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \
       (defined(OpenBSD) && (OpenBSD >= 199603)) || defined(linux) || \
       (defined(__FreeBSD__) && (__FreeBSD_version >= 501113))
 	COPYIFNAME(ifp, ipfl.fl_ifname);
 #  else
 	ipfl.fl_unit = (u_int)ifp->if_unit;
 #   if defined(_KERNEL)
 	if ((ipfl.fl_ifname[0] = ifp->if_name[0]))
 		if ((ipfl.fl_ifname[1] = ifp->if_name[1]))
 			if ((ipfl.fl_ifname[2] = ifp->if_name[2]))
 				ipfl.fl_ifname[3] = ifp->if_name[3];
 #   else
 	(void) strncpy(ipfl.fl_ifname, IFNAME(ifp), sizeof(ipfl.fl_ifname));
 	ipfl.fl_ifname[sizeof(ipfl.fl_ifname) - 1] = '\0';
 #   endif
 #  endif
 # endif /* __hpux || SOLARIS */
 	mlen = fin->fin_plen - hlen;
 	if (!ipl_logall) {
 		mlen = (flags & FR_LOGBODY) ? MIN(mlen, 128) : 0;
 	} else if ((flags & FR_LOGBODY) == 0) {
 		mlen = 0;
 	}
 	if (mlen < 0)
 		mlen = 0;
 	ipfl.fl_plen = (u_char)mlen;
 	ipfl.fl_hlen = (u_char)hlen;
 	ipfl.fl_rule = fin->fin_rule;
 	(void) strncpy(ipfl.fl_group, fin->fin_group, FR_GROUPLEN);
 	if (fin->fin_fr != NULL) {
 		ipfl.fl_loglevel = fin->fin_fr->fr_loglevel;
 		ipfl.fl_logtag = fin->fin_fr->fr_logtag;
 	} else {
 		ipfl.fl_loglevel = 0xffff;
 		ipfl.fl_logtag = FR_NOLOGTAG;
 	}
 	if (fin->fin_nattag != NULL)
 		bcopy(fin->fin_nattag, (void *)&ipfl.fl_nattag,
 		      sizeof(ipfl.fl_nattag));
 	ipfl.fl_flags = flags;
 	ipfl.fl_breason = (fin->fin_reason & 0xff);
 	ipfl.fl_dir = fin->fin_out;
 	ipfl.fl_lflags = fin->fin_flx;
 	ptrs[0] = (void *)&ipfl;
 	sizes[0] = sizeof(ipfl);
 	types[0] = 0;
 # if defined(MENTAT) && defined(_KERNEL)
 	/*
 	 * Are we copied from the mblk or an aligned array ?
 	 */
 	if (fin->fin_ip == (ip_t *)m->b_rptr) {
 		ptrs[1] = m;
 		sizes[1] = hlen + mlen;
 		types[1] = 1;
 	} else {
 		ptrs[1] = fin->fin_ip;
 		sizes[1] = hlen + mlen;
 		types[1] = 0;
 	}
 # else
 	ptrs[1] = m;
 	sizes[1] = hlen + mlen;
 	types[1] = 1;
 # endif /* MENTAT */
 	return ipf_log_items(IPL_LOGIPF, fin, ptrs, sizes, types, 2);
 }


 /* ------------------------------------------------------------------------ */
 /* Function:    ipf_log_items                                               */
 /* Returns:     int - 0 == success, -1 == failure                           */
 /* Parameters:  dev(I)    - device that owns this log record                */
 /*              fin(I)    - pointer to packet information                   */
 /*              items(I)  - array of pointers to log data                   */
 /*              itemsz(I) - array of size of valid memory pointed to        */
 /*              types(I)  - type of data pointed to by items pointers       */
 /*              cnt(I)    - number of elements in arrays items/itemsz/types */
 /*                                                                          */
 /* Takes an array of parameters and constructs one record to include the    */
 /* miscellaneous packet information, as well as packet data, for reading    */
 /* from the log device.                                                     */
 /* ------------------------------------------------------------------------ */
 int
 ipf_log_items(dev, fin, items, itemsz, types, cnt)
 	int dev;
 	fr_info_t *fin;
 	void **items;
 	size_t *itemsz;
 	int *types, cnt;
 {
 	caddr_t buf, ptr;
 	iplog_t *ipl;
 	size_t len;
 	int i;
 	SPL_INT(s);

 	/*
 	 * Check to see if this log record has a CRC which matches the last
 	 * record logged.  If it does, just up the count on the previous one
 	 * rather than create a new one.
 	 */
 	if (ipl_suppress) {
 		MUTEX_ENTER(&ipl_mutex);
 		if ((fin != NULL) && (fin->fin_off == 0)) {
 			if ((ipll[dev] != NULL) &&
 			    bcmp((char *)fin, (char *)&iplcrc[dev],
 				 FI_LCSIZE) == 0) {
 				ipll[dev]->ipl_count++;
 				MUTEX_EXIT(&ipl_mutex);
 				return 0;
 			}
 			bcopy((char *)fin, (char *)&iplcrc[dev], FI_LCSIZE);
 		} else
 			bzero((char *)&iplcrc[dev], FI_CSIZE);
 		MUTEX_EXIT(&ipl_mutex);
 	}

 	/*
 	 * Get the total amount of data to be logged.
 	 */
 	for (i = 0, len = sizeof(iplog_t); i < cnt; i++)
 		len += itemsz[i];

 	/*
 	 * check that we have space to record this information and can
 	 * allocate that much.
 	 */
 	KMALLOCS(buf, caddr_t, len);
 	if (buf == NULL)
 		return -1;
 	SPL_NET(s);
 	MUTEX_ENTER(&ipl_mutex);
 	if ((iplused[dev] + len) > ipl_logsize) {
 		MUTEX_EXIT(&ipl_mutex);
 		SPL_X(s);
 		KFREES(buf, len);
 		return -1;
 	}
 	iplused[dev] += len;
 	MUTEX_EXIT(&ipl_mutex);
 	SPL_X(s);

 	/*
 	 * advance the log pointer to the next empty record and deduct the
 	 * amount of space we're going to use.
 	 */
 	ipl = (iplog_t *)buf;
 	ipl->ipl_magic = ipl_magic[dev];
 	ipl->ipl_count = 1;
 	ipl->ipl_next = NULL;
 	ipl->ipl_dsize = len;
 #ifdef _KERNEL
 	GETKTIME(&ipl->ipl_sec);
 #else
 	ipl->ipl_sec = 0;
 	ipl->ipl_usec = 0;
 #endif

 	/*
 	 * Loop through all the items to be logged, copying each one to the
 	 * buffer.  Use bcopy for normal data or the mb_t copyout routine.
 	 */
 	for (i = 0, ptr = buf + sizeof(*ipl); i < cnt; i++) {
 		if (types[i] == 0) {
 			bcopy(items[i], ptr, itemsz[i]);
 		} else if (types[i] == 1) {
 			COPYDATA(items[i], 0, itemsz[i], ptr);
 		}
 		ptr += itemsz[i];
 	}
 	SPL_NET(s);
 	MUTEX_ENTER(&ipl_mutex);
 	ipll[dev] = ipl;
 	*iplh[dev] = ipl;
 	iplh[dev] = &ipl->ipl_next;

 	/*
 	 * Now that the log record has been completed and added to the queue,
 	 * wake up any listeners who may want to read it.
 	 */
 # if SOLARIS && defined(_KERNEL)
 	cv_signal(&iplwait);
 	MUTEX_EXIT(&ipl_mutex);
 	pollwakeup(&iplpollhead[dev], POLLRDNORM);
 # else
 	MUTEX_EXIT(&ipl_mutex);
 	WAKEUP(iplh, dev);
 	POLLWAKEUP(dev);
 # endif
 	SPL_X(s);
 # ifdef	IPL_SELECT
 	iplog_input_ready(dev);
 # endif
 	return 0;
 }


 /* ------------------------------------------------------------------------ */
 /* Function:    ipf_log_read                                                */
 /* Returns:     int    - 0 == success, else error value.                    */
 /* Parameters:  unit(I) - device we are reading from                        */
 /*              uio(O)  - pointer to information about where to store data  */
 /*                                                                          */
 /* Called to handle a read on an IPFilter device.  Returns only complete    */
 /* log messages - will not partially copy a log record out to userland.     */
 /*                                                                          */
 /* NOTE: This function will block and wait for a signal to return data if   */
 /* there is none present.  Asynchronous I/O is not implemented.             */
 /* ------------------------------------------------------------------------ */
 int
 ipf_log_read(unit, uio)
 	minor_t unit;
 	struct uio *uio;
 {
 	size_t dlen, copied;
 	int error = 0;
 	iplog_t *ipl;
 	SPL_INT(s);

 	/*
 	 * Sanity checks.  Make sure the minor # is valid and we're copying
 	 * a valid chunk of data.
 	 */
 	if (IPL_LOGMAX < unit) {
 		ipf_interror = 40001;
 		return ENXIO;
 	}
 	if (uio->uio_resid == 0)
 		return 0;

 	if (uio->uio_resid < sizeof(iplog_t)) {
 		ipf_interror = 40002;
 		return EINVAL;
 	}
 	if (uio->uio_resid > ipl_logsize) {
 		ipf_interror = 40005;
 		return EINVAL;
 	}

 	/*
 	 * Lock the log so we can snapshot the variables.  Wait for a signal
 	 * if the log is empty.
 	 */
 	SPL_NET(s);
 	MUTEX_ENTER(&ipl_mutex);

 	while (iplt[unit] == NULL) {
 # if SOLARIS && defined(_KERNEL)
 		if (!cv_wait_sig(&iplwait, &ipl_mutex.ipf_lk)) {
 			MUTEX_EXIT(&ipl_mutex);
 			ipf_interror = 40003;
 			return EINTR;
 		}
 # else
 #  if defined(__hpux) && defined(_KERNEL)
 		lock_t *l;

 #   ifdef IPL_SELECT
 		if (uio->uio_fpflags & (FNBLOCK|FNDELAY)) {
 			/* this is no blocking system call */
 			MUTEX_EXIT(&ipl_mutex);
 			return 0;
 		}
 #   endif

 		MUTEX_EXIT(&ipl_mutex);
 		l = get_sleep_lock(&iplh[unit]);
 		error = sleep(&iplh[unit], PZERO+1);
 		spinunlock(l);
 #  else
 #   if defined(__osf__) && defined(_KERNEL)
 		error = mpsleep(&iplh[unit], PSUSP|PCATCH,  "iplread", 0,
 				&ipl_mutex, MS_LOCK_SIMPLE);
 #   else
 		MUTEX_EXIT(&ipl_mutex);
 		SPL_X(s);
 		error = SLEEP(unit + iplh, "ipl sleep");
 #   endif /* __osf__ */
 #  endif /* __hpux */
 		if (error) {
 			ipf_interror = 40004;
 			return error;
 		}
 		SPL_NET(s);
 		MUTEX_ENTER(&ipl_mutex);
 # endif /* SOLARIS */
 	}

 # if (BSD >= 199101) || defined(__FreeBSD__) || defined(__osf__)
 	uio->uio_rw = UIO_READ;
 # endif

 	for (copied = 0; (ipl = iplt[unit]) != NULL; copied += dlen) {
 		dlen = ipl->ipl_dsize;
 		if (dlen > uio->uio_resid)
 			break;
 		/*
 		 * Don't hold the mutex over the uiomove call.
 		 */
 		iplt[unit] = ipl->ipl_next;
 		iplused[unit] -= dlen;
 		MUTEX_EXIT(&ipl_mutex);
 		SPL_X(s);
 		error = UIOMOVE(ipl, dlen, UIO_READ, uio);
 		if (error) {
 			SPL_NET(s);
 			MUTEX_ENTER(&ipl_mutex);
 			ipf_interror = 40006;
 			ipl->ipl_next = iplt[unit];
 			iplt[unit] = ipl;
 			iplused[unit] += dlen;
 			break;
 		}
 		MUTEX_ENTER(&ipl_mutex);
 		KFREES((caddr_t)ipl, dlen);
 		SPL_NET(s);
 	}
 	if (!iplt[unit]) {
 		iplused[unit] = 0;
 		iplh[unit] = &iplt[unit];
 		ipll[unit] = NULL;
 	}

 	MUTEX_EXIT(&ipl_mutex);
 	SPL_X(s);
 	return error;
 }


 /* ------------------------------------------------------------------------ */
 /* Function:    ipf_log_clear                                               */
 /* Returns:     int    - number of log bytes cleared.                       */
 /* Parameters:  unit(I) - device we are reading from                        */
 /*                                                                          */
 /* Deletes all queued up log records for a given output device.             */
 /* ------------------------------------------------------------------------ */
 int
 ipf_log_clear(unit)
 	minor_t unit;
 {
 	iplog_t *ipl;
 	int used;
 	SPL_INT(s);

 	SPL_NET(s);
 	MUTEX_ENTER(&ipl_mutex);
 	while ((ipl = iplt[unit]) != NULL) {
 		iplt[unit] = ipl->ipl_next;
 		KFREES((caddr_t)ipl, ipl->ipl_dsize);
 	}
 	iplh[unit] = &iplt[unit];
 	ipll[unit] = NULL;
 	used = iplused[unit];
 	iplused[unit] = 0;
 	bzero((char *)&iplcrc[unit], FI_CSIZE);
 	MUTEX_EXIT(&ipl_mutex);
 	SPL_X(s);
 	return used;
 }


 /* ------------------------------------------------------------------------ */
 /* Function:    ipf_log_canread                                             */
 /* Returns:     int    - 0 == no data to read, 1 = data present             */
 /* Parameters:  unit(I) - device we are reading from                        */
 /*                                                                          */
 /* Returns an indication of whether or not there is data present in the     */
 /* current buffer for the selected ipf device.                              */
 /* ------------------------------------------------------------------------ */
 int
 ipf_log_canread(unit)
 	int unit;
 {
 	return iplt[unit] != NULL;
 }
 #endif /* IPFILTER_LOG */
	/*
	* Copyright (C) 1997-2003 by Darren Reed.
	*
	* See the IPFILTER.LICENCE file for details on licencing.
	*
	* $Id$
	*/
	#include <sys/param.h>
	#if defined(KERNEL) \|\| defined(_KERNEL)
	# undef KERNEL
	# undef _KERNEL
	# define KERNEL 1
	# define _KERNEL 1
	#endif
	#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
	defined(_KERNEL)
	# if (__NetBSD_Version__ < 399001400)
	# include "opt_ipfilter_log.h"
	# else
	# include "opt_ipfilter.h"
	# endif
	#endif
	#if defined(__FreeBSD__) && !defined(IPFILTER_LKM)
	# if defined(_KERNEL)
	# if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
	# include "opt_ipfilter.h"
	# endif
	# else
	# include <osreldate.h>
	# endif
	#endif
	#ifndef SOLARIS
	# define SOLARIS (defined(sun) && (defined(__svr4__) \|\| defined(__SVR4)))
	#endif
	#include <sys/errno.h>
	#include <sys/types.h>
	#include <sys/file.h>
	#ifndef _KERNEL
	# include <stdio.h>
	# include <string.h>
	# include <stdlib.h>
	# include <ctype.h>
	# define _KERNEL
	# define KERNEL
	# ifdef __OpenBSD__
	struct file;
	# endif
	# include <sys/uio.h>
	# undef _KERNEL
	# undef KERNEL
	#endif
	#if (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)) && \
	defined(_KERNEL)
	# include <sys/fcntl.h>
	# include <sys/filio.h>
	#else
	# include <sys/ioctl.h>
	#endif
	#include <sys/time.h>
	#if defined(_KERNEL)
	# include <sys/systm.h>
	# if (defined(NetBSD) && (__NetBSD_Version__ >= 104000000))
	# include <sys/proc.h>
	# endif
	#endif /* _KERNEL */
	#if !SOLARIS && !defined(__hpux) && !defined(linux)
	# if (defined(NetBSD) && (NetBSD > 199609)) \|\| \
	(defined(OpenBSD) && (OpenBSD > 199603)) \|\| \
	(defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
	# include <sys/dirent.h>
	# else
	# include <sys/dir.h>
	# endif
	# include <sys/mbuf.h>
	# include <sys/select.h>
	# if __FreeBSD_version >= 500000
	# include <sys/selinfo.h>
	# endif
	#else
	# if !defined(__hpux) && defined(_KERNEL)
	# include <sys/filio.h>
	# include <sys/cred.h>
	# include <sys/ddi.h>
	# include <sys/sunddi.h>
	# include <sys/ksynch.h>
	# include <sys/kmem.h>
	# include <sys/mkdev.h>
	# include <sys/dditypes.h>
	# include <sys/cmn_err.h>
	# endif /* !__hpux */
	#endif /* !SOLARIS && !__hpux */
	#if !defined(linux)
	# include <sys/protosw.h>
	#endif
	#include <sys/socket.h>

	#include <net/if.h>
	#ifdef sun
	# include <net/af.h>
	#endif
	#if __FreeBSD_version >= 300000
	# include <net/if_var.h>
	#endif
	#include <net/route.h>
	#include <netinet/in.h>
	#ifdef __sgi
	# include <sys/ddi.h>
	# ifdef IFF_DRVRLOCK /* IRIX6 */
	# include <sys/hashing.h>
	# endif
	#endif
	#if !defined(__hpux) && !defined(linux) && \
	!(defined(__sgi) && !defined(IFF_DRVRLOCK)) /IRIX<6/
	# include <netinet/in_var.h>
	#endif
	#include <netinet/in_systm.h>
	#include <netinet/ip.h>
	#include <netinet/tcp.h>
	#include <netinet/udp.h>
	#include <netinet/ip_icmp.h>
	#ifdef USE_INET6
	# include <netinet/icmp6.h>
	#endif
	#if !defined(linux)
	# include <netinet/ip_var.h>
	#endif
	#ifndef _KERNEL
	# include <syslog.h>
	#endif
	#include "netinet/ip_compat.h"
	#include <netinet/tcpip.h>
	#include "netinet/ip_fil.h"
	#include "netinet/ip_nat.h"
	#include "netinet/ip_frag.h"
	#include "netinet/ip_state.h"
	#include "netinet/ip_auth.h"
	#if (__FreeBSD_version >= 300000) \|\| defined(__NetBSD__)
	# include <sys/malloc.h>
	#endif
	/* END OF INCLUDES */

	#ifdef IPFILTER_LOG

	# if defined(IPL_SELECT)
	# include <machine/sys/user.h>
	# include <sys/kthread_iface.h>
	# define READ_COLLISION 0x001

	iplog_select_t iplog_ss[IPL_LOGMAX+1];

	extern int selwait;
	# endif /* IPL_SELECT */

	# if defined(linux) && defined(_KERNEL)
	wait_queue_head_t iplh_linux[IPL_LOGSIZE];
	# endif
	# if SOLARIS && defined(_KERNEL)
	extern kcondvar_t iplwait;
	extern struct pollhead iplpollhead[IPL_LOGSIZE];
	# endif

	iplog_t *iplh[IPL_LOGSIZE], iplt[IPL_LOGSIZE], *ipll[IPL_LOGSIZE];
	int iplused[IPL_LOGSIZE];
	static fr_info_t iplcrc[IPL_LOGSIZE];
	int ipl_suppress = 1;
	int ipl_logmax = IPL_LOGMAX;
	int ipl_logall = 0;
	int ipl_log_init = 0;
	int ipl_logsize = IPFILTER_LOGSIZE;
	int ipl_magic[IPL_LOGSIZE] = { IPL_MAGIC, IPL_MAGIC_NAT, IPL_MAGIC_STATE,
	IPL_MAGIC, IPL_MAGIC, IPL_MAGIC,
	IPL_MAGIC, IPL_MAGIC };


	/* ------------------------------------------------------------------------ */
	/* Function: ipf_log_init */
	/* Returns: int - 0 == success (always returned) */
	/* Parameters: Nil */
	/* */
	/* Initialise log buffers & pointers. Also iniialised the CRC to a local */
	/* secret for use in calculating the "last log checksum". */
	/* ------------------------------------------------------------------------ */
	int
	ipf_log_init()
	{
	int i;

	for (i = IPL_LOGMAX; i >= 0; i--) {
	iplt[i] = NULL;
	ipll[i] = NULL;
	iplh[i] = &iplt[i];
	iplused[i] = 0;
	bzero((char *)&iplcrc[i], sizeof(iplcrc[i]));
	# ifdef IPL_SELECT
	iplog_ss[i].read_waiter = 0;
	iplog_ss[i].state = 0;
	# endif
	# if defined(linux) && defined(_KERNEL)
	init_waitqueue_head(iplh_linux + i);
	# endif
	}

	# if SOLARIS && defined(_KERNEL)
	cv_init(&iplwait, "ipl condvar", CV_DRIVER, NULL);
	# endif
	MUTEX_INIT(&ipl_mutex, "ipf log mutex");

	ipl_log_init = 1;

	return 0;
	}


	/* ------------------------------------------------------------------------ */
	/* Function: ipf_log_unload */
	/* Returns: Nil */
	/* Parameters: Nil */
	/* */
	/* Clean up any log data that has accumulated without being read. */
	/* ------------------------------------------------------------------------ */
	void
	ipf_log_unload()
	{
	int i;

	if (ipl_log_init == 0)
	return;

	for (i = IPL_LOGMAX; i >= 0; i--)
	(void) ipf_log_clear(i);

	# if SOLARIS && defined(_KERNEL)
	cv_destroy(&iplwait);
	# endif
	MUTEX_DESTROY(&ipl_mutex);

	ipl_log_init = 0;
	}


	/* ------------------------------------------------------------------------ */
	/* Function: ipf_log_pkt */
	/* Returns: int - 0 == success, -1 == failure */
	/* Parameters: fin(I) - pointer to packet information */
	/* flags(I) - flags from filter rules */
	/* */
	/* Create a log record for a packet given that it has been triggered by a */
	/* rule (or the default setting). Calculate the transport protocol header */
	/* size using predetermined size of a couple of popular protocols and thus */
	/* how much data to copy into the log, including part of the data body if */
	/* requested. */
	/* ------------------------------------------------------------------------ */
	int
	ipf_log_pkt(fin, flags)
	fr_info_t *fin;
	u_int flags;
	{
	register size_t hlen;
	int types[2], mlen;
	size_t sizes[2];
	void *ptrs[2];
	ipflog_t ipfl;
	u_char p;
	mb_t *m;
	# if (SOLARIS \|\| defined(__hpux)) && defined(_KERNEL)
	qif_t *ifp;
	# else
	struct ifnet *ifp;
	# endif /* SOLARIS \|\| __hpux */

	m = fin->fin_m;
	if (m == NULL)
	return -1;

	ipfl.fl_nattag.ipt_num[0] = 0;
	ifp = fin->fin_ifp;
	hlen = (char )fin->fin_dp - (char )fin->fin_ip;

	/*
	* calculate header size.
	*/
	if (fin->fin_off == 0) {
	p = fin->fin_fi.fi_p;
	if (p == IPPROTO_TCP)
	hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen);
	else if (p == IPPROTO_UDP)
	hlen += MIN(sizeof(udphdr_t), fin->fin_dlen);
	else if (p == IPPROTO_ICMP) {
	struct icmp *icmp;

	icmp = (struct icmp *)fin->fin_dp;

	/*
	* For ICMP, if the packet is an error packet, also
	* include the information about the packet which
	* caused the error.
	*/
	switch (icmp->icmp_type)
	{
	case ICMP_UNREACH :
	case ICMP_SOURCEQUENCH :
	case ICMP_REDIRECT :
	case ICMP_TIMXCEED :
	case ICMP_PARAMPROB :
	hlen += MIN(sizeof(struct icmp) + 8,
	fin->fin_dlen);
	break;
	default :
	hlen += MIN(sizeof(struct icmp),
	fin->fin_dlen);
	break;
	}
	}
	# ifdef USE_INET6
	else if (p == IPPROTO_ICMPV6) {
	struct icmp6_hdr *icmp;

	icmp = (struct icmp6_hdr *)fin->fin_dp;

	/*
	* For ICMPV6, if the packet is an error packet, also
	* include the information about the packet which
	* caused the error.
	*/
	if (icmp->icmp6_type < 128) {
	hlen += MIN(sizeof(struct icmp6_hdr) + 8,
	fin->fin_dlen);
	} else {
	hlen += MIN(sizeof(struct icmp6_hdr),
	fin->fin_dlen);
	}
	}
	# endif
	}
	/*
	* Get the interface number and name to which this packet is
	* currently associated.
	*/
	# if (SOLARIS \|\| defined(__hpux)) && defined(_KERNEL)
	ipfl.fl_unit = (u_int)ifp->qf_ppa;
	COPYIFNAME(ifp, ipfl.fl_ifname);
	# else
	# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) \|\| \
	(defined(OpenBSD) && (OpenBSD >= 199603)) \|\| defined(linux) \|\| \
	(defined(__FreeBSD__) && (__FreeBSD_version >= 501113))
	COPYIFNAME(ifp, ipfl.fl_ifname);
	# else
	ipfl.fl_unit = (u_int)ifp->if_unit;
	# if defined(_KERNEL)
	if ((ipfl.fl_ifname[0] = ifp->if_name[0]))
	if ((ipfl.fl_ifname[1] = ifp->if_name[1]))
	if ((ipfl.fl_ifname[2] = ifp->if_name[2]))
	ipfl.fl_ifname[3] = ifp->if_name[3];
	# else
	(void) strncpy(ipfl.fl_ifname, IFNAME(ifp), sizeof(ipfl.fl_ifname));
	ipfl.fl_ifname[sizeof(ipfl.fl_ifname) - 1] = '\0';
	# endif
	# endif
	# endif /* __hpux \|\| SOLARIS */
	mlen = fin->fin_plen - hlen;
	if (!ipl_logall) {
	mlen = (flags & FR_LOGBODY) ? MIN(mlen, 128) : 0;
	} else if ((flags & FR_LOGBODY) == 0) {
	mlen = 0;
	}
	if (mlen < 0)
	mlen = 0;
	ipfl.fl_plen = (u_char)mlen;
	ipfl.fl_hlen = (u_char)hlen;
	ipfl.fl_rule = fin->fin_rule;
	(void) strncpy(ipfl.fl_group, fin->fin_group, FR_GROUPLEN);
	if (fin->fin_fr != NULL) {
	ipfl.fl_loglevel = fin->fin_fr->fr_loglevel;
	ipfl.fl_logtag = fin->fin_fr->fr_logtag;
	} else {
	ipfl.fl_loglevel = 0xffff;
	ipfl.fl_logtag = FR_NOLOGTAG;
	}
	if (fin->fin_nattag != NULL)
	bcopy(fin->fin_nattag, (void *)&ipfl.fl_nattag,
	sizeof(ipfl.fl_nattag));
	ipfl.fl_flags = flags;
	ipfl.fl_breason = (fin->fin_reason & 0xff);
	ipfl.fl_dir = fin->fin_out;
	ipfl.fl_lflags = fin->fin_flx;
	ptrs[0] = (void *)&ipfl;
	sizes[0] = sizeof(ipfl);
	types[0] = 0;
	# if defined(MENTAT) && defined(_KERNEL)
	/*
	* Are we copied from the mblk or an aligned array ?
	*/
	if (fin->fin_ip == (ip_t *)m->b_rptr) {
	ptrs[1] = m;
	sizes[1] = hlen + mlen;
	types[1] = 1;
	} else {
	ptrs[1] = fin->fin_ip;
	sizes[1] = hlen + mlen;
	types[1] = 0;
	}
	# else
	ptrs[1] = m;
	sizes[1] = hlen + mlen;
	types[1] = 1;
	# endif /* MENTAT */
	return ipf_log_items(IPL_LOGIPF, fin, ptrs, sizes, types, 2);
	}


	/* ------------------------------------------------------------------------ */
	/* Function: ipf_log_items */
	/* Returns: int - 0 == success, -1 == failure */
	/* Parameters: dev(I) - device that owns this log record */
	/* fin(I) - pointer to packet information */
	/* items(I) - array of pointers to log data */
	/* itemsz(I) - array of size of valid memory pointed to */
	/* types(I) - type of data pointed to by items pointers */
	/* cnt(I) - number of elements in arrays items/itemsz/types */
	/* */
	/* Takes an array of parameters and constructs one record to include the */
	/* miscellaneous packet information, as well as packet data, for reading */
	/* from the log device. */
	/* ------------------------------------------------------------------------ */
	int
	ipf_log_items(dev, fin, items, itemsz, types, cnt)
	int dev;
	fr_info_t *fin;
	void **items;
	size_t *itemsz;
	int *types, cnt;
	{
	caddr_t buf, ptr;
	iplog_t *ipl;
	size_t len;
	int i;
	SPL_INT(s);

	/*
	* Check to see if this log record has a CRC which matches the last
	* record logged. If it does, just up the count on the previous one
	* rather than create a new one.
	*/
	if (ipl_suppress) {
	MUTEX_ENTER(&ipl_mutex);
	if ((fin != NULL) && (fin->fin_off == 0)) {
	if ((ipll[dev] != NULL) &&
	bcmp((char )fin, (char )&iplcrc[dev],
	FI_LCSIZE) == 0) {
	ipll[dev]->ipl_count++;
	MUTEX_EXIT(&ipl_mutex);
	return 0;
	}
	bcopy((char )fin, (char )&iplcrc[dev], FI_LCSIZE);
	} else
	bzero((char *)&iplcrc[dev], FI_CSIZE);
	MUTEX_EXIT(&ipl_mutex);
	}

	/*
	* Get the total amount of data to be logged.
	*/
	for (i = 0, len = sizeof(iplog_t); i < cnt; i++)
	len += itemsz[i];

	/*
	* check that we have space to record this information and can
	* allocate that much.
	*/
	KMALLOCS(buf, caddr_t, len);
	if (buf == NULL)
	return -1;
	SPL_NET(s);
	MUTEX_ENTER(&ipl_mutex);
	if ((iplused[dev] + len) > ipl_logsize) {
	MUTEX_EXIT(&ipl_mutex);
	SPL_X(s);
	KFREES(buf, len);
	return -1;
	}
	iplused[dev] += len;
	MUTEX_EXIT(&ipl_mutex);
	SPL_X(s);

	/*
	* advance the log pointer to the next empty record and deduct the
	* amount of space we're going to use.
	*/
	ipl = (iplog_t *)buf;
	ipl->ipl_magic = ipl_magic[dev];
	ipl->ipl_count = 1;
	ipl->ipl_next = NULL;
	ipl->ipl_dsize = len;
	#ifdef _KERNEL
	GETKTIME(&ipl->ipl_sec);
	#else
	ipl->ipl_sec = 0;
	ipl->ipl_usec = 0;
	#endif

	/*
	* Loop through all the items to be logged, copying each one to the
	* buffer. Use bcopy for normal data or the mb_t copyout routine.
	*/
	for (i = 0, ptr = buf + sizeof(*ipl); i < cnt; i++) {
	if (types[i] == 0) {
	bcopy(items[i], ptr, itemsz[i]);
	} else if (types[i] == 1) {
	COPYDATA(items[i], 0, itemsz[i], ptr);
	}
	ptr += itemsz[i];
	}
	SPL_NET(s);
	MUTEX_ENTER(&ipl_mutex);
	ipll[dev] = ipl;
	*iplh[dev] = ipl;
	iplh[dev] = &ipl->ipl_next;

	/*
	* Now that the log record has been completed and added to the queue,
	* wake up any listeners who may want to read it.
	*/
	# if SOLARIS && defined(_KERNEL)
	cv_signal(&iplwait);
	MUTEX_EXIT(&ipl_mutex);
	pollwakeup(&iplpollhead[dev], POLLRDNORM);
	# else
	MUTEX_EXIT(&ipl_mutex);
	WAKEUP(iplh, dev);
	POLLWAKEUP(dev);
	# endif
	SPL_X(s);
	# ifdef IPL_SELECT
	iplog_input_ready(dev);
	# endif
	return 0;
	}


	/* ------------------------------------------------------------------------ */
	/* Function: ipf_log_read */
	/* Returns: int - 0 == success, else error value. */
	/* Parameters: unit(I) - device we are reading from */
	/* uio(O) - pointer to information about where to store data */
	/* */
	/* Called to handle a read on an IPFilter device. Returns only complete */
	/* log messages - will not partially copy a log record out to userland. */
	/* */
	/* NOTE: This function will block and wait for a signal to return data if */
	/* there is none present. Asynchronous I/O is not implemented. */
	/* ------------------------------------------------------------------------ */
	int
	ipf_log_read(unit, uio)
	minor_t unit;
	struct uio *uio;
	{
	size_t dlen, copied;
	int error = 0;
	iplog_t *ipl;
	SPL_INT(s);

	/*
	* Sanity checks. Make sure the minor # is valid and we're copying
	* a valid chunk of data.
	*/
	if (IPL_LOGMAX < unit) {
	ipf_interror = 40001;
	return ENXIO;
	}
	if (uio->uio_resid == 0)
	return 0;

	if (uio->uio_resid < sizeof(iplog_t)) {
	ipf_interror = 40002;
	return EINVAL;
	}
	if (uio->uio_resid > ipl_logsize) {
	ipf_interror = 40005;
	return EINVAL;
	}

	/*
	* Lock the log so we can snapshot the variables. Wait for a signal
	* if the log is empty.
	*/
	SPL_NET(s);
	MUTEX_ENTER(&ipl_mutex);

	while (iplt[unit] == NULL) {
	# if SOLARIS && defined(_KERNEL)
	if (!cv_wait_sig(&iplwait, &ipl_mutex.ipf_lk)) {
	MUTEX_EXIT(&ipl_mutex);
	ipf_interror = 40003;
	return EINTR;
	}
	# else
	# if defined(__hpux) && defined(_KERNEL)
	lock_t *l;

	# ifdef IPL_SELECT
	if (uio->uio_fpflags & (FNBLOCK\|FNDELAY)) {
	/* this is no blocking system call */
	MUTEX_EXIT(&ipl_mutex);
	return 0;
	}
	# endif

	MUTEX_EXIT(&ipl_mutex);
	l = get_sleep_lock(&iplh[unit]);
	error = sleep(&iplh[unit], PZERO+1);
	spinunlock(l);
	# else
	# if defined(__osf__) && defined(_KERNEL)
	error = mpsleep(&iplh[unit], PSUSP\|PCATCH, "iplread", 0,
	&ipl_mutex, MS_LOCK_SIMPLE);
	# else
	MUTEX_EXIT(&ipl_mutex);
	SPL_X(s);
	error = SLEEP(unit + iplh, "ipl sleep");
	# endif /* __osf__ */
	# endif /* __hpux */
	if (error) {
	ipf_interror = 40004;
	return error;
	}
	SPL_NET(s);
	MUTEX_ENTER(&ipl_mutex);
	# endif /* SOLARIS */
	}

	# if (BSD >= 199101) \|\| defined(__FreeBSD__) \|\| defined(__osf__)
	uio->uio_rw = UIO_READ;
	# endif

	for (copied = 0; (ipl = iplt[unit]) != NULL; copied += dlen) {
	dlen = ipl->ipl_dsize;
	if (dlen > uio->uio_resid)
	break;
	/*
	* Don't hold the mutex over the uiomove call.
	*/
	iplt[unit] = ipl->ipl_next;
	iplused[unit] -= dlen;
	MUTEX_EXIT(&ipl_mutex);
	SPL_X(s);
	error = UIOMOVE(ipl, dlen, UIO_READ, uio);
	if (error) {
	SPL_NET(s);
	MUTEX_ENTER(&ipl_mutex);
	ipf_interror = 40006;
	ipl->ipl_next = iplt[unit];
	iplt[unit] = ipl;
	iplused[unit] += dlen;
	break;
	}
	MUTEX_ENTER(&ipl_mutex);
	KFREES((caddr_t)ipl, dlen);
	SPL_NET(s);
	}
	if (!iplt[unit]) {
	iplused[unit] = 0;
	iplh[unit] = &iplt[unit];
	ipll[unit] = NULL;
	}

	MUTEX_EXIT(&ipl_mutex);
	SPL_X(s);
	return error;
	}


	/* ------------------------------------------------------------------------ */
	/* Function: ipf_log_clear */
	/* Returns: int - number of log bytes cleared. */
	/* Parameters: unit(I) - device we are reading from */
	/* */
	/* Deletes all queued up log records for a given output device. */
	/* ------------------------------------------------------------------------ */
	int
	ipf_log_clear(unit)
	minor_t unit;
	{
	iplog_t *ipl;
	int used;
	SPL_INT(s);

	SPL_NET(s);
	MUTEX_ENTER(&ipl_mutex);
	while ((ipl = iplt[unit]) != NULL) {
	iplt[unit] = ipl->ipl_next;
	KFREES((caddr_t)ipl, ipl->ipl_dsize);
	}
	iplh[unit] = &iplt[unit];
	ipll[unit] = NULL;
	used = iplused[unit];
	iplused[unit] = 0;
	bzero((char *)&iplcrc[unit], FI_CSIZE);
	MUTEX_EXIT(&ipl_mutex);
	SPL_X(s);
	return used;
	}


	/* ------------------------------------------------------------------------ */
	/* Function: ipf_log_canread */
	/* Returns: int - 0 == no data to read, 1 = data present */
	/* Parameters: unit(I) - device we are reading from */
	/* */
	/* Returns an indication of whether or not there is data present in the */
	/* current buffer for the selected ipf device. */
	/* ------------------------------------------------------------------------ */
	int
	ipf_log_canread(unit)
	int unit;
	{
	return iplt[unit] != NULL;
	}
	#endif /* IPFILTER_LOG */