ip_log.c revision 170268 
1/*	$FreeBSD: head/sys/contrib/ipfilter/netinet/ip_log.c 170268 2007-06-04 02:54:36Z darrenr $	*/
2
3/*
4 * Copyright (C) 1997-2003 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 * $FreeBSD: head/sys/contrib/ipfilter/netinet/ip_log.c 170268 2007-06-04 02:54:36Z darrenr $
9 * Id: ip_log.c,v 2.75.2.11 2006/03/26 13:50:47 darrenr Exp $
10 */
11#include <sys/param.h>
12#if defined(KERNEL) || defined(_KERNEL)
13# undef KERNEL
14# undef _KERNEL
15# define        KERNEL	1
16# define        _KERNEL	1
17#endif
18#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
19    defined(_KERNEL)
20# if (__NetBSD_Version__ < 399001400)
21#  include "opt_ipfilter_log.h"
22# else
23#  include "opt_ipfilter.h"
24# endif
25#endif
26#if defined(__FreeBSD__) && !defined(IPFILTER_LKM)
27# if defined(_KERNEL)
28#  if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
29#   include "opt_ipfilter.h"
30#  endif
31# else
32#  include <osreldate.h>
33# endif
34#endif
35#ifndef SOLARIS
36# define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
37#endif
38#include <sys/errno.h>
39#include <sys/types.h>
40#include <sys/file.h>
41#ifndef _KERNEL
42# include <stdio.h>
43# include <string.h>
44# include <stdlib.h>
45# include <ctype.h>
46# define _KERNEL
47# define KERNEL
48# ifdef __OpenBSD__
49struct file;
50# endif
51# include <sys/uio.h>
52# undef _KERNEL
53# undef KERNEL
54#endif
55#if __FreeBSD_version >= 220000 && defined(_KERNEL)
56# include <sys/fcntl.h>
57# include <sys/filio.h>
58#else
59# include <sys/ioctl.h>
60#endif
61#include <sys/time.h>
62#if defined(_KERNEL)
63# include <sys/systm.h>
64# if defined(NetBSD) && (__NetBSD_Version__ >= 104000000)
65#  include <sys/proc.h>
66# endif
67#endif /* _KERNEL */
68#if !SOLARIS && !defined(__hpux) && !defined(linux)
69# if (defined(NetBSD) && NetBSD > 199609) || \
70     (defined(OpenBSD) && OpenBSD > 199603) || \
71     (__FreeBSD_version >= 300000)
72#  include <sys/dirent.h>
73# else
74#  include <sys/dir.h>
75# endif
76# include <sys/mbuf.h>
77# include <sys/select.h>
78# if __FreeBSD_version >= 500000
79#  include <sys/selinfo.h>
80# endif
81#else
82# if !defined(__hpux) && defined(_KERNEL)
83#  include <sys/filio.h>
84#  include <sys/cred.h>
85#  include <sys/ddi.h>
86#  include <sys/sunddi.h>
87#  include <sys/ksynch.h>
88#  include <sys/kmem.h>
89#  include <sys/mkdev.h>
90#  include <sys/dditypes.h>
91#  include <sys/cmn_err.h>
92# endif /* !__hpux */
93#endif /* !SOLARIS && !__hpux */
94#if !defined(linux)
95# include <sys/protosw.h>
96#endif
97#include <sys/socket.h>
98
99#include <net/if.h>
100#ifdef sun
101# include <net/af.h>
102#endif
103#if __FreeBSD_version >= 300000
104# include <net/if_var.h>
105#endif
106#include <net/route.h>
107#include <netinet/in.h>
108#ifdef __sgi
109# include <sys/ddi.h>
110# ifdef IFF_DRVRLOCK /* IRIX6 */
111#  include <sys/hashing.h>
112# endif
113#endif
114#if !defined(__hpux) && !defined(linux) && \
115    !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /*IRIX<6*/
116# include <netinet/in_var.h>
117#endif
118#include <netinet/in_systm.h>
119#include <netinet/ip.h>
120#include <netinet/tcp.h>
121#include <netinet/udp.h>
122#include <netinet/ip_icmp.h>
123#ifdef USE_INET6
124# include <netinet/icmp6.h>
125#endif
126#if !defined(linux)
127# include <netinet/ip_var.h>
128#endif
129#ifndef _KERNEL
130# include <syslog.h>
131#endif
132#include "netinet/ip_compat.h"
133#include <netinet/tcpip.h>
134#include "netinet/ip_fil.h"
135#include "netinet/ip_nat.h"
136#include "netinet/ip_frag.h"
137#include "netinet/ip_state.h"
138#include "netinet/ip_auth.h"
139#if (__FreeBSD_version >= 300000) || defined(__NetBSD__)
140# include <sys/malloc.h>
141#endif
142/* END OF INCLUDES */
143
144#ifdef	IPFILTER_LOG
145
146# if defined(IPL_SELECT)
147#  include	<machine/sys/user.h>
148#  include	<sys/kthread_iface.h>
149#  define	READ_COLLISION	0x001
150
151iplog_select_t	iplog_ss[IPL_LOGMAX+1];
152
153extern int selwait;
154# endif /* IPL_SELECT */
155
156# if defined(linux) && defined(_KERNEL)
157wait_queue_head_t	iplh_linux[IPL_LOGSIZE];
158# endif
159# if SOLARIS && defined(_KERNEL)
160extern	kcondvar_t	iplwait;
161extern	struct pollhead	iplpollhead[IPL_LOGSIZE];
162# endif
163
164iplog_t	**iplh[IPL_LOGSIZE], *iplt[IPL_LOGSIZE], *ipll[IPL_LOGSIZE];
165int	iplused[IPL_LOGSIZE];
166static fr_info_t	iplcrc[IPL_LOGSIZE];
167int	ipl_suppress = 1;
168int	ipl_logmax = IPL_LOGMAX;
169int	ipl_logall = 0;
170int	ipl_log_init = 0;
171int	ipl_logsize = IPFILTER_LOGSIZE;
172int	ipl_magic[IPL_LOGSIZE] = { IPL_MAGIC, IPL_MAGIC_NAT, IPL_MAGIC_STATE,
173				   IPL_MAGIC, IPL_MAGIC, IPL_MAGIC,
174				   IPL_MAGIC, IPL_MAGIC };
175
176
177/* ------------------------------------------------------------------------ */
178/* Function:    fr_loginit                                                  */
179/* Returns:     int - 0 == success (always returned)                        */
180/* Parameters:  Nil                                                         */
181/*                                                                          */
182/* Initialise log buffers & pointers.  Also iniialised the CRC to a local   */
183/* secret for use in calculating the "last log checksum".                   */
184/* ------------------------------------------------------------------------ */
185int fr_loginit()
186{
187	int	i;
188
189	for (i = IPL_LOGMAX; i >= 0; i--) {
190		iplt[i] = NULL;
191		ipll[i] = NULL;
192		iplh[i] = &iplt[i];
193		iplused[i] = 0;
194		bzero((char *)&iplcrc[i], sizeof(iplcrc[i]));
195# ifdef	IPL_SELECT
196		iplog_ss[i].read_waiter = 0;
197		iplog_ss[i].state = 0;
198# endif
199# if defined(linux) && defined(_KERNEL)
200		init_waitqueue_head(iplh_linux + i);
201# endif
202	}
203
204# if SOLARIS && defined(_KERNEL)
205	cv_init(&iplwait, "ipl condvar", CV_DRIVER, NULL);
206# endif
207	MUTEX_INIT(&ipl_mutex, "ipf log mutex");
208
209	ipl_log_init = 1;
210
211	return 0;
212}
213
214
215/* ------------------------------------------------------------------------ */
216/* Function:    fr_logunload                                                */
217/* Returns:     Nil                                                         */
218/* Parameters:  Nil                                                         */
219/*                                                                          */
220/* Clean up any log data that has accumulated without being read.           */
221/* ------------------------------------------------------------------------ */
222void fr_logunload()
223{
224	int i;
225
226	if (ipl_log_init == 0)
227		return;
228
229	for (i = IPL_LOGMAX; i >= 0; i--)
230		(void) ipflog_clear(i);
231
232# if SOLARIS && defined(_KERNEL)
233	cv_destroy(&iplwait);
234# endif
235	MUTEX_DESTROY(&ipl_mutex);
236
237	ipl_log_init = 0;
238}
239
240
241/* ------------------------------------------------------------------------ */
242/* Function:    ipflog                                                      */
243/* Returns:     int - 0 == success, -1 == failure                           */
244/* Parameters:  fin(I)   - pointer to packet information                    */
245/*              flags(I) - flags from filter rules                          */
246/*                                                                          */
247/* Create a log record for a packet given that it has been triggered by a   */
248/* rule (or the default setting).  Calculate the transport protocol header  */
249/* size using predetermined size of a couple of popular protocols and thus  */
250/* how much data to copy into the log, including part of the data body if   */
251/* requested.                                                               */
252/* ------------------------------------------------------------------------ */
253int ipflog(fin, flags)
254fr_info_t *fin;
255u_int flags;
256{
257	register size_t hlen;
258	int types[2], mlen;
259	size_t sizes[2];
260	void *ptrs[2];
261	ipflog_t ipfl;
262	u_char p;
263	mb_t *m;
264# if (SOLARIS || defined(__hpux)) && defined(_KERNEL)
265	qif_t *ifp;
266# else
267	struct ifnet *ifp;
268# endif /* SOLARIS || __hpux */
269
270	m = fin->fin_m;
271	if (m == NULL)
272		return -1;
273
274	ipfl.fl_nattag.ipt_num[0] = 0;
275	ifp = fin->fin_ifp;
276	hlen = fin->fin_hlen;
277	/*
278	 * calculate header size.
279	 */
280	if (fin->fin_off == 0) {
281		p = fin->fin_fi.fi_p;
282		if (p == IPPROTO_TCP)
283			hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen);
284		else if (p == IPPROTO_UDP)
285			hlen += MIN(sizeof(udphdr_t), fin->fin_dlen);
286		else if (p == IPPROTO_ICMP) {
287			struct icmp *icmp;
288
289			icmp = (struct icmp *)fin->fin_dp;
290
291			/*
292			 * For ICMP, if the packet is an error packet, also
293			 * include the information about the packet which
294			 * caused the error.
295			 */
296			switch (icmp->icmp_type)
297			{
298			case ICMP_UNREACH :
299			case ICMP_SOURCEQUENCH :
300			case ICMP_REDIRECT :
301			case ICMP_TIMXCEED :
302			case ICMP_PARAMPROB :
303				hlen += MIN(sizeof(struct icmp) + 8,
304					    fin->fin_dlen);
305				break;
306			default :
307				hlen += MIN(sizeof(struct icmp),
308					    fin->fin_dlen);
309				break;
310			}
311		}
312# ifdef USE_INET6
313		else if (p == IPPROTO_ICMPV6) {
314			struct icmp6_hdr *icmp;
315
316			icmp = (struct icmp6_hdr *)fin->fin_dp;
317
318			/*
319			 * For ICMPV6, if the packet is an error packet, also
320			 * include the information about the packet which
321			 * caused the error.
322			 */
323			if (icmp->icmp6_type < 128) {
324				hlen += MIN(sizeof(struct icmp6_hdr) + 8,
325					    fin->fin_dlen);
326			} else {
327				hlen += MIN(sizeof(struct icmp6_hdr),
328					    fin->fin_dlen);
329			}
330		}
331# endif
332	}
333	/*
334	 * Get the interface number and name to which this packet is
335	 * currently associated.
336	 */
337# if (SOLARIS || defined(__hpux)) && defined(_KERNEL)
338	ipfl.fl_unit = (u_int)ifp->qf_ppa;
339	COPYIFNAME(ifp, ipfl.fl_ifname);
340# else
341#  if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \
342      (defined(OpenBSD) && (OpenBSD >= 199603)) || defined(linux) || \
343      (defined(__FreeBSD__) && (__FreeBSD_version >= 501113))
344	COPYIFNAME(ifp, ipfl.fl_ifname);
345#  else
346	ipfl.fl_unit = (u_int)ifp->if_unit;
347#   if defined(_KERNEL)
348	if ((ipfl.fl_ifname[0] = ifp->if_name[0]))
349		if ((ipfl.fl_ifname[1] = ifp->if_name[1]))
350			if ((ipfl.fl_ifname[2] = ifp->if_name[2]))
351				ipfl.fl_ifname[3] = ifp->if_name[3];
352#   else
353	(void) strncpy(ipfl.fl_ifname, IFNAME(ifp), sizeof(ipfl.fl_ifname));
354	ipfl.fl_ifname[sizeof(ipfl.fl_ifname) - 1] = '\0';
355#   endif
356#  endif
357# endif /* __hpux || SOLARIS */
358	mlen = fin->fin_plen - hlen;
359	if (!ipl_logall) {
360		mlen = (flags & FR_LOGBODY) ? MIN(mlen, 128) : 0;
361	} else if ((flags & FR_LOGBODY) == 0) {
362		mlen = 0;
363	}
364	if (mlen < 0)
365		mlen = 0;
366	ipfl.fl_plen = (u_char)mlen;
367	ipfl.fl_hlen = (u_char)hlen;
368	ipfl.fl_rule = fin->fin_rule;
369	(void) strncpy(ipfl.fl_group, fin->fin_group, FR_GROUPLEN);
370	if (fin->fin_fr != NULL) {
371		ipfl.fl_loglevel = fin->fin_fr->fr_loglevel;
372		ipfl.fl_logtag = fin->fin_fr->fr_logtag;
373	} else {
374		ipfl.fl_loglevel = 0xffff;
375		ipfl.fl_logtag = FR_NOLOGTAG;
376	}
377	if (fin->fin_nattag != NULL)
378		bcopy(fin->fin_nattag, (void *)&ipfl.fl_nattag,
379		      sizeof(ipfl.fl_nattag));
380	ipfl.fl_flags = flags;
381	ipfl.fl_dir = fin->fin_out;
382	ipfl.fl_lflags = fin->fin_flx;
383	ptrs[0] = (void *)&ipfl;
384	sizes[0] = sizeof(ipfl);
385	types[0] = 0;
386# if defined(MENTAT) && defined(_KERNEL)
387	/*
388	 * Are we copied from the mblk or an aligned array ?
389	 */
390	if (fin->fin_ip == (ip_t *)m->b_rptr) {
391		ptrs[1] = m;
392		sizes[1] = hlen + mlen;
393		types[1] = 1;
394	} else {
395		ptrs[1] = fin->fin_ip;
396		sizes[1] = hlen + mlen;
397		types[1] = 0;
398	}
399# else
400	ptrs[1] = m;
401	sizes[1] = hlen + mlen;
402	types[1] = 1;
403# endif /* MENTAT */
404	return ipllog(IPL_LOGIPF, fin, ptrs, sizes, types, 2);
405}
406
407
408/* ------------------------------------------------------------------------ */
409/* Function:    ipllog                                                      */
410/* Returns:     int - 0 == success, -1 == failure                           */
411/* Parameters:  dev(I)    - device that owns this log record                */
412/*              fin(I)    - pointer to packet information                   */
413/*              items(I)  - array of pointers to log data                   */
414/*              itemsz(I) - array of size of valid memory pointed to        */
415/*              types(I)  - type of data pointed to by items pointers       */
416/*              cnt(I)    - number of elements in arrays items/itemsz/types */
417/*                                                                          */
418/* Takes an array of parameters and constructs one record to include the    */
419/* miscellaneous packet information, as well as packet data, for reading    */
420/* from the log device.                                                     */
421/* ------------------------------------------------------------------------ */
422int ipllog(dev, fin, items, itemsz, types, cnt)
423int dev;
424fr_info_t *fin;
425void **items;
426size_t *itemsz;
427int *types, cnt;
428{
429	caddr_t buf, ptr;
430	iplog_t *ipl;
431	size_t len;
432	int i;
433	SPL_INT(s);
434
435	/*
436	 * Check to see if this log record has a CRC which matches the last
437	 * record logged.  If it does, just up the count on the previous one
438	 * rather than create a new one.
439	 */
440	if (ipl_suppress) {
441		MUTEX_ENTER(&ipl_mutex);
442		if ((fin != NULL) && (fin->fin_off == 0)) {
443			if ((ipll[dev] != NULL) &&
444			    bcmp((char *)fin, (char *)&iplcrc[dev],
445				 FI_LCSIZE) == 0) {
446				ipll[dev]->ipl_count++;
447				MUTEX_EXIT(&ipl_mutex);
448				return 0;
449			}
450			bcopy((char *)fin, (char *)&iplcrc[dev], FI_LCSIZE);
451		} else
452			bzero((char *)&iplcrc[dev], FI_CSIZE);
453		MUTEX_EXIT(&ipl_mutex);
454	}
455
456	/*
457	 * Get the total amount of data to be logged.
458	 */
459	for (i = 0, len = sizeof(iplog_t); i < cnt; i++)
460		len += itemsz[i];
461
462	/*
463	 * check that we have space to record this information and can
464	 * allocate that much.
465	 */
466	KMALLOCS(buf, caddr_t, len);
467	if (buf == NULL)
468		return -1;
469	SPL_NET(s);
470	MUTEX_ENTER(&ipl_mutex);
471	if ((iplused[dev] + len) > ipl_logsize) {
472		MUTEX_EXIT(&ipl_mutex);
473		SPL_X(s);
474		KFREES(buf, len);
475		return -1;
476	}
477	iplused[dev] += len;
478	MUTEX_EXIT(&ipl_mutex);
479	SPL_X(s);
480
481	/*
482	 * advance the log pointer to the next empty record and deduct the
483	 * amount of space we're going to use.
484	 */
485	ipl = (iplog_t *)buf;
486	ipl->ipl_magic = ipl_magic[dev];
487	ipl->ipl_count = 1;
488	ipl->ipl_next = NULL;
489	ipl->ipl_dsize = len;
490#ifdef _KERNEL
491	GETKTIME(&ipl->ipl_sec);
492#else
493	ipl->ipl_sec = 0;
494	ipl->ipl_usec = 0;
495#endif
496
497	/*
498	 * Loop through all the items to be logged, copying each one to the
499	 * buffer.  Use bcopy for normal data or the mb_t copyout routine.
500	 */
501	for (i = 0, ptr = buf + sizeof(*ipl); i < cnt; i++) {
502		if (types[i] == 0) {
503			bcopy(items[i], ptr, itemsz[i]);
504		} else if (types[i] == 1) {
505			COPYDATA(items[i], 0, itemsz[i], ptr);
506		}
507		ptr += itemsz[i];
508	}
509	SPL_NET(s);
510	MUTEX_ENTER(&ipl_mutex);
511	ipll[dev] = ipl;
512	*iplh[dev] = ipl;
513	iplh[dev] = &ipl->ipl_next;
514
515	/*
516	 * Now that the log record has been completed and added to the queue,
517	 * wake up any listeners who may want to read it.
518	 */
519# if SOLARIS && defined(_KERNEL)
520	cv_signal(&iplwait);
521	MUTEX_EXIT(&ipl_mutex);
522	pollwakeup(&iplpollhead[dev], POLLRDNORM);
523# else
524	MUTEX_EXIT(&ipl_mutex);
525	WAKEUP(iplh, dev);
526	POLLWAKEUP(dev);
527# endif
528	SPL_X(s);
529# ifdef	IPL_SELECT
530	iplog_input_ready(dev);
531# endif
532	return 0;
533}
534
535
536/* ------------------------------------------------------------------------ */
537/* Function:    ipflog_read                                                 */
538/* Returns:     int    - 0 == success, else error value.                    */
539/* Parameters:  unit(I) - device we are reading from                        */
540/*              uio(O)  - pointer to information about where to store data  */
541/*                                                                          */
542/* Called to handle a read on an IPFilter device.  Returns only complete    */
543/* log messages - will not partially copy a log record out to userland.     */
544/*                                                                          */
545/* NOTE: This function will block and wait for a signal to return data if   */
546/* there is none present.  Asynchronous I/O is not implemented.             */
547/* ------------------------------------------------------------------------ */
548int ipflog_read(unit, uio)
549minor_t unit;
550struct uio *uio;
551{
552	size_t dlen, copied;
553	int error = 0;
554	iplog_t *ipl;
555	SPL_INT(s);
556
557	/*
558	 * Sanity checks.  Make sure the minor # is valid and we're copying
559	 * a valid chunk of data.
560	 */
561	if (IPL_LOGMAX < unit)
562		return ENXIO;
563	if (uio->uio_resid == 0)
564		return 0;
565	if ((uio->uio_resid < sizeof(iplog_t)) ||
566	    (uio->uio_resid > ipl_logsize))
567		return EINVAL;
568
569	/*
570	 * Lock the log so we can snapshot the variables.  Wait for a signal
571	 * if the log is empty.
572	 */
573	SPL_NET(s);
574	MUTEX_ENTER(&ipl_mutex);
575
576	while (iplt[unit] == NULL) {
577# if SOLARIS && defined(_KERNEL)
578		if (!cv_wait_sig(&iplwait, &ipl_mutex.ipf_lk)) {
579			MUTEX_EXIT(&ipl_mutex);
580			return EINTR;
581		}
582# else
583#  if defined(__hpux) && defined(_KERNEL)
584		lock_t *l;
585
586#   ifdef IPL_SELECT
587		if (uio->uio_fpflags & (FNBLOCK|FNDELAY)) {
588			/* this is no blocking system call */
589			MUTEX_EXIT(&ipl_mutex);
590			return 0;
591		}
592#   endif
593
594		MUTEX_EXIT(&ipl_mutex);
595		l = get_sleep_lock(&iplh[unit]);
596		error = sleep(&iplh[unit], PZERO+1);
597		spinunlock(l);
598#  else
599#   if defined(__osf__) && defined(_KERNEL)
600		error = mpsleep(&iplh[unit], PSUSP|PCATCH,  "iplread", 0,
601				&ipl_mutex, MS_LOCK_SIMPLE);
602#   else
603		MUTEX_EXIT(&ipl_mutex);
604		SPL_X(s);
605		error = SLEEP(unit + iplh, "ipl sleep");
606#   endif /* __osf__ */
607#  endif /* __hpux */
608		if (error)
609			return error;
610		SPL_NET(s);
611		MUTEX_ENTER(&ipl_mutex);
612# endif /* SOLARIS */
613	}
614
615# if (BSD >= 199101) || defined(__FreeBSD__) || defined(__osf__)
616	uio->uio_rw = UIO_READ;
617# endif
618
619	for (copied = 0; (ipl = iplt[unit]) != NULL; copied += dlen) {
620		dlen = ipl->ipl_dsize;
621		if (dlen > uio->uio_resid)
622			break;
623		/*
624		 * Don't hold the mutex over the uiomove call.
625		 */
626		iplt[unit] = ipl->ipl_next;
627		iplused[unit] -= dlen;
628		MUTEX_EXIT(&ipl_mutex);
629		SPL_X(s);
630		error = UIOMOVE((caddr_t)ipl, dlen, UIO_READ, uio);
631		if (error) {
632			SPL_NET(s);
633			MUTEX_ENTER(&ipl_mutex);
634			ipl->ipl_next = iplt[unit];
635			iplt[unit] = ipl;
636			iplused[unit] += dlen;
637			break;
638		}
639		MUTEX_ENTER(&ipl_mutex);
640		KFREES((caddr_t)ipl, dlen);
641		SPL_NET(s);
642	}
643	if (!iplt[unit]) {
644		iplused[unit] = 0;
645		iplh[unit] = &iplt[unit];
646		ipll[unit] = NULL;
647	}
648
649	MUTEX_EXIT(&ipl_mutex);
650	SPL_X(s);
651	return error;
652}
653
654
655/* ------------------------------------------------------------------------ */
656/* Function:    ipflog_clear                                                */
657/* Returns:     int    - number of log bytes cleared.                       */
658/* Parameters:  unit(I) - device we are reading from                        */
659/*                                                                          */
660/* Deletes all queued up log records for a given output device.             */
661/* ------------------------------------------------------------------------ */
662int ipflog_clear(unit)
663minor_t unit;
664{
665	iplog_t *ipl;
666	int used;
667	SPL_INT(s);
668
669	SPL_NET(s);
670	MUTEX_ENTER(&ipl_mutex);
671	while ((ipl = iplt[unit]) != NULL) {
672		iplt[unit] = ipl->ipl_next;
673		KFREES((caddr_t)ipl, ipl->ipl_dsize);
674	}
675	iplh[unit] = &iplt[unit];
676	ipll[unit] = NULL;
677	used = iplused[unit];
678	iplused[unit] = 0;
679	bzero((char *)&iplcrc[unit], FI_CSIZE);
680	MUTEX_EXIT(&ipl_mutex);
681	SPL_X(s);
682	return used;
683}
684
685
686/* ------------------------------------------------------------------------ */
687/* Function:    ipflog_canread                                              */
688/* Returns:     int    - 0 == no data to read, 1 = data present             */
689/* Parameters:  unit(I) - device we are reading from                        */
690/*                                                                          */
691/* Returns an indication of whether or not there is data present in the     */
692/* current buffer for the selected ipf device.                              */
693/* ------------------------------------------------------------------------ */
694int ipflog_canread(unit)
695int unit;
696{
697	return iplt[unit] != NULL;
698}
699#endif /* IPFILTER_LOG */
700