1/* $FreeBSD$ */ 2 3/* 4 * Copyright (C) 1997-2003 by Darren Reed. 5 * 6 * See the IPFILTER.LICENCE file for details on licencing. 7 * 8 * $FreeBSD$ 9 * Id: ip_log.c,v 2.75.2.19 2007/09/09 11:32:06 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 (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)) && \ 56 defined(_KERNEL) 57# include <sys/fcntl.h> 58# include <sys/filio.h> 59#else 60# include <sys/ioctl.h> 61#endif 62#include <sys/time.h> 63#if defined(_KERNEL) 64# include <sys/systm.h> 65# if (defined(NetBSD) && (__NetBSD_Version__ >= 104000000)) 66# include <sys/proc.h> 67# endif 68#endif /* _KERNEL */ 69#if !SOLARIS && !defined(__hpux) && !defined(linux) 70# if (defined(NetBSD) && (NetBSD > 199609)) || \ 71 (defined(OpenBSD) && (OpenBSD > 199603)) || \ 72 (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)) 73# include <sys/dirent.h> 74# else 75# include <sys/dir.h> 76# endif 77# include <sys/mbuf.h> 78# include <sys/select.h> 79# if __FreeBSD_version >= 500000 80# include <sys/selinfo.h> 81# endif 82#else 83# if !defined(__hpux) && defined(_KERNEL) 84# include <sys/filio.h> 85# include <sys/cred.h> 86# include <sys/ddi.h> 87# include <sys/sunddi.h> 88# include <sys/ksynch.h> 89# include <sys/kmem.h> 90# include <sys/mkdev.h> 91# include <sys/dditypes.h> 92# include <sys/cmn_err.h> 93# endif /* !__hpux */ 94#endif /* !SOLARIS && !__hpux */ 95#if !defined(linux) 96# include <sys/protosw.h> 97#endif 98#include <sys/socket.h> 99 100#include <net/if.h> 101#ifdef sun 102# include <net/af.h> 103#endif 104#if __FreeBSD_version >= 300000 105# include <net/if_var.h> 106#endif 107#include <net/route.h> 108#include <netinet/in.h> 109#ifdef __sgi 110# include <sys/ddi.h> 111# ifdef IFF_DRVRLOCK /* IRIX6 */ 112# include <sys/hashing.h> 113# endif 114#endif 115#if !defined(__hpux) && !defined(linux) && \ 116 !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /*IRIX<6*/ 117# include <netinet/in_var.h> 118#endif 119#include <netinet/in_systm.h> 120#include <netinet/ip.h> 121#include <netinet/tcp.h> 122#include <netinet/udp.h> 123#include <netinet/ip_icmp.h> 124#ifdef USE_INET6 125# include <netinet/icmp6.h> 126#endif 127#if !defined(linux) 128# include <netinet/ip_var.h> 129#endif 130#ifndef _KERNEL 131# include <syslog.h> 132#endif 133#include "netinet/ip_compat.h" 134#include <netinet/tcpip.h> 135#include "netinet/ip_fil.h" 136#include "netinet/ip_nat.h" 137#include "netinet/ip_frag.h" 138#include "netinet/ip_state.h" 139#include "netinet/ip_auth.h" 140#if (__FreeBSD_version >= 300000) || defined(__NetBSD__) 141# include <sys/malloc.h> 142#endif 143/* END OF INCLUDES */ 144 145#ifdef IPFILTER_LOG 146 147# if defined(IPL_SELECT) 148# include <machine/sys/user.h> 149# include <sys/kthread_iface.h> 150# define READ_COLLISION 0x001 151 152iplog_select_t iplog_ss[IPL_LOGMAX+1]; 153 154extern int selwait; 155# endif /* IPL_SELECT */ 156 157# if defined(linux) && defined(_KERNEL) 158wait_queue_head_t iplh_linux[IPL_LOGSIZE]; 159# endif 160# if SOLARIS && defined(_KERNEL) 161extern kcondvar_t iplwait; 162extern struct pollhead iplpollhead[IPL_LOGSIZE]; 163# endif 164 165iplog_t **iplh[IPL_LOGSIZE], *iplt[IPL_LOGSIZE], *ipll[IPL_LOGSIZE]; 166int iplused[IPL_LOGSIZE]; 167static fr_info_t iplcrc[IPL_LOGSIZE]; 168int ipl_suppress = 1; 169int ipl_logmax = IPL_LOGMAX; 170int ipl_logall = 0; 171int ipl_log_init = 0; 172int ipl_logsize = IPFILTER_LOGSIZE; 173int ipl_magic[IPL_LOGSIZE] = { IPL_MAGIC, IPL_MAGIC_NAT, IPL_MAGIC_STATE, 174 IPL_MAGIC, IPL_MAGIC, IPL_MAGIC, 175 IPL_MAGIC, IPL_MAGIC }; 176 177 178/* ------------------------------------------------------------------------ */ 179/* Function: fr_loginit */ 180/* Returns: int - 0 == success (always returned) */ 181/* Parameters: Nil */ 182/* */ 183/* Initialise log buffers & pointers. Also iniialised the CRC to a local */ 184/* secret for use in calculating the "last log checksum". */ 185/* ------------------------------------------------------------------------ */ 186int fr_loginit() 187{ 188 int i; 189 190 for (i = IPL_LOGMAX; i >= 0; i--) { 191 iplt[i] = NULL; 192 ipll[i] = NULL; 193 iplh[i] = &iplt[i]; 194 iplused[i] = 0; 195 bzero((char *)&iplcrc[i], sizeof(iplcrc[i])); 196# ifdef IPL_SELECT 197 iplog_ss[i].read_waiter = 0; 198 iplog_ss[i].state = 0; 199# endif 200# if defined(linux) && defined(_KERNEL) 201 init_waitqueue_head(iplh_linux + i); 202# endif 203 } 204 205# if SOLARIS && defined(_KERNEL) 206 cv_init(&iplwait, "ipl condvar", CV_DRIVER, NULL); 207# endif 208 MUTEX_INIT(&ipl_mutex, "ipf log mutex"); 209 210 ipl_log_init = 1; 211 212 return 0; 213} 214 215 216/* ------------------------------------------------------------------------ */ 217/* Function: fr_logunload */ 218/* Returns: Nil */ 219/* Parameters: Nil */ 220/* */ 221/* Clean up any log data that has accumulated without being read. */ 222/* ------------------------------------------------------------------------ */ 223void fr_logunload() 224{ 225 int i; 226 227 if (ipl_log_init == 0) 228 return; 229 230 for (i = IPL_LOGMAX; i >= 0; i--) 231 (void) ipflog_clear(i); 232 233# if SOLARIS && defined(_KERNEL) 234 cv_destroy(&iplwait); 235# endif 236 MUTEX_DESTROY(&ipl_mutex); 237 238 ipl_log_init = 0; 239} 240 241 242/* ------------------------------------------------------------------------ */ 243/* Function: ipflog */ 244/* Returns: int - 0 == success, -1 == failure */ 245/* Parameters: fin(I) - pointer to packet information */ 246/* flags(I) - flags from filter rules */ 247/* */ 248/* Create a log record for a packet given that it has been triggered by a */ 249/* rule (or the default setting). Calculate the transport protocol header */ 250/* size using predetermined size of a couple of popular protocols and thus */ 251/* how much data to copy into the log, including part of the data body if */ 252/* requested. */ 253/* ------------------------------------------------------------------------ */ 254int ipflog(fin, flags) 255fr_info_t *fin; 256u_int flags; 257{ 258 register size_t hlen; 259 int types[2], mlen; 260 size_t sizes[2]; 261 void *ptrs[2]; 262 ipflog_t ipfl; 263 u_char p; 264 mb_t *m; 265# if (SOLARIS || defined(__hpux)) && defined(_KERNEL) && \ 266 !defined(_INET_IP_STACK_H) 267 qif_t *ifp; 268# else 269 struct ifnet *ifp; 270# endif /* SOLARIS || __hpux */ 271 272 m = fin->fin_m; 273 if (m == NULL) 274 return -1; 275 276 ipfl.fl_nattag.ipt_num[0] = 0; 277 ifp = fin->fin_ifp; 278 if (fin->fin_exthdr != NULL) 279 hlen = (char *)fin->fin_dp - (char *)fin->fin_ip; 280 else 281 hlen = fin->fin_hlen; 282 /* 283 * calculate header size. 284 */ 285 if (fin->fin_off == 0) { 286 p = fin->fin_fi.fi_p; 287 if (p == IPPROTO_TCP) 288 hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen); 289 else if (p == IPPROTO_UDP) 290 hlen += MIN(sizeof(udphdr_t), fin->fin_dlen); 291 else if (p == IPPROTO_ICMP) { 292 struct icmp *icmp; 293 294 icmp = (struct icmp *)fin->fin_dp; 295 296 /* 297 * For ICMP, if the packet is an error packet, also 298 * include the information about the packet which 299 * caused the error. 300 */ 301 switch (icmp->icmp_type) 302 { 303 case ICMP_UNREACH : 304 case ICMP_SOURCEQUENCH : 305 case ICMP_REDIRECT : 306 case ICMP_TIMXCEED : 307 case ICMP_PARAMPROB : 308 hlen += MIN(sizeof(struct icmp) + 8, 309 fin->fin_dlen); 310 break; 311 default : 312 hlen += MIN(sizeof(struct icmp), 313 fin->fin_dlen); 314 break; 315 } 316 } 317# ifdef USE_INET6 318 else if (p == IPPROTO_ICMPV6) { 319 struct icmp6_hdr *icmp; 320 321 icmp = (struct icmp6_hdr *)fin->fin_dp; 322 323 /* 324 * For ICMPV6, if the packet is an error packet, also 325 * include the information about the packet which 326 * caused the error. 327 */ 328 if (icmp->icmp6_type < 128) { 329 hlen += MIN(sizeof(struct icmp6_hdr) + 8, 330 fin->fin_dlen); 331 } else { 332 hlen += MIN(sizeof(struct icmp6_hdr), 333 fin->fin_dlen); 334 } 335 } 336# endif 337 } 338 /* 339 * Get the interface number and name to which this packet is 340 * currently associated. 341 */ 342# if (SOLARIS || defined(__hpux)) && defined(_KERNEL) && \ 343 !defined(_INET_IP_STACK_H) 344 ipfl.fl_unit = (u_int)ifp->qf_ppa; 345 COPYIFNAME(fin->fin_v, ifp, ipfl.fl_ifname); 346# else 347# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \ 348 (defined(OpenBSD) && (OpenBSD >= 199603)) || defined(linux) || \ 349 (defined(__FreeBSD__) && (__FreeBSD_version >= 501113)) || \ 350 (SOLARIS && defined(_INET_IP_STACK_H)) 351 COPYIFNAME(fin->fin_v, ifp, ipfl.fl_ifname); 352# else 353 ipfl.fl_unit = (u_int)ifp->if_unit; 354# if defined(_KERNEL) 355 if ((ipfl.fl_ifname[0] = ifp->if_name[0])) 356 if ((ipfl.fl_ifname[1] = ifp->if_name[1])) 357 if ((ipfl.fl_ifname[2] = ifp->if_name[2])) 358 ipfl.fl_ifname[3] = ifp->if_name[3]; 359# else 360 COPYIFNAME(fin->fin_v, ifp, ipfl.fl_ifname); 361 ipfl.fl_ifname[sizeof(ipfl.fl_ifname) - 1] = '\0'; 362# endif 363# endif 364# endif /* __hpux || SOLARIS */ 365 mlen = fin->fin_plen - hlen; 366 if (!ipl_logall) { 367 mlen = (flags & FR_LOGBODY) ? MIN(mlen, 128) : 0; 368 } else if ((flags & FR_LOGBODY) == 0) { 369 mlen = 0; 370 } 371 if (mlen < 0) 372 mlen = 0; 373 ipfl.fl_plen = (u_char)mlen; 374 ipfl.fl_hlen = (u_char)hlen; 375 ipfl.fl_rule = fin->fin_rule; 376 (void) strncpy(ipfl.fl_group, fin->fin_group, FR_GROUPLEN); 377 if (fin->fin_fr != NULL) { 378 ipfl.fl_loglevel = fin->fin_fr->fr_loglevel; 379 ipfl.fl_logtag = fin->fin_fr->fr_logtag; 380 } else { 381 ipfl.fl_loglevel = 0xffff; 382 ipfl.fl_logtag = FR_NOLOGTAG; 383 } 384 if (fin->fin_nattag != NULL) 385 bcopy(fin->fin_nattag, (void *)&ipfl.fl_nattag, 386 sizeof(ipfl.fl_nattag)); 387 ipfl.fl_flags = flags; 388 ipfl.fl_dir = fin->fin_out; 389 ipfl.fl_lflags = fin->fin_flx; 390 ptrs[0] = (void *)&ipfl; 391 sizes[0] = sizeof(ipfl); 392 types[0] = 0; 393# if defined(MENTAT) && defined(_KERNEL) 394 /* 395 * Are we copied from the mblk or an aligned array ? 396 */ 397 if (fin->fin_ip == (ip_t *)m->b_rptr) { 398 ptrs[1] = m; 399 sizes[1] = hlen + mlen; 400 types[1] = 1; 401 } else { 402 ptrs[1] = fin->fin_ip; 403 sizes[1] = hlen + mlen; 404 types[1] = 0; 405 } 406# else 407 ptrs[1] = m; 408 sizes[1] = hlen + mlen; 409 types[1] = 1; 410# endif /* MENTAT */ 411 return ipllog(IPL_LOGIPF, fin, ptrs, sizes, types, 2); 412} 413 414 415/* ------------------------------------------------------------------------ */ 416/* Function: ipllog */ 417/* Returns: int - 0 == success, -1 == failure */ 418/* Parameters: dev(I) - device that owns this log record */ 419/* fin(I) - pointer to packet information */ 420/* items(I) - array of pointers to log data */ 421/* itemsz(I) - array of size of valid memory pointed to */ 422/* types(I) - type of data pointed to by items pointers */ 423/* cnt(I) - number of elements in arrays items/itemsz/types */ 424/* */ 425/* Takes an array of parameters and constructs one record to include the */ 426/* miscellaneous packet information, as well as packet data, for reading */ 427/* from the log device. */ 428/* ------------------------------------------------------------------------ */ 429int ipllog(dev, fin, items, itemsz, types, cnt) 430int dev; 431fr_info_t *fin; 432void **items; 433size_t *itemsz; 434int *types, cnt; 435{ 436 u_char *buf, *ptr; 437 iplog_t *ipl; 438 size_t len; 439 int i; 440 SPL_INT(s); 441 442 /* 443 * Check to see if this log record has a CRC which matches the last 444 * record logged. If it does, just up the count on the previous one 445 * rather than create a new one. 446 */ 447 if (ipl_suppress) { 448 MUTEX_ENTER(&ipl_mutex); 449 if ((fin != NULL) && (fin->fin_off == 0)) { 450 if ((ipll[dev] != NULL) && 451 bcmp((char *)fin, (char *)&iplcrc[dev], 452 FI_LCSIZE) == 0) { 453 ipll[dev]->ipl_count++; 454 MUTEX_EXIT(&ipl_mutex); 455 return 0; 456 } 457 bcopy((char *)fin, (char *)&iplcrc[dev], FI_LCSIZE); 458 } else 459 bzero((char *)&iplcrc[dev], FI_CSIZE); 460 MUTEX_EXIT(&ipl_mutex); 461 } 462 463 /* 464 * Get the total amount of data to be logged. 465 */ 466 for (i = 0, len = sizeof(iplog_t); i < cnt; i++) 467 len += itemsz[i]; 468 469 /* 470 * check that we have space to record this information and can 471 * allocate that much. 472 */ 473 KMALLOCS(buf, u_char *, len); 474 if (buf == NULL) 475 return -1; 476 SPL_NET(s); 477 MUTEX_ENTER(&ipl_mutex); 478 if ((iplused[dev] + len) > ipl_logsize) { 479 MUTEX_EXIT(&ipl_mutex); 480 SPL_X(s); 481 KFREES(buf, len); 482 return -1; 483 } 484 iplused[dev] += len; 485 MUTEX_EXIT(&ipl_mutex); 486 SPL_X(s); 487 488 /* 489 * advance the log pointer to the next empty record and deduct the 490 * amount of space we're going to use. 491 */ 492 ipl = (iplog_t *)buf; 493 ipl->ipl_magic = ipl_magic[dev]; 494 ipl->ipl_count = 1; 495 ipl->ipl_next = NULL; 496 ipl->ipl_dsize = len; 497#ifdef _KERNEL 498 GETKTIME(&ipl->ipl_sec); 499#else 500 ipl->ipl_sec = 0; 501 ipl->ipl_usec = 0; 502#endif 503 504 /* 505 * Loop through all the items to be logged, copying each one to the 506 * buffer. Use bcopy for normal data or the mb_t copyout routine. 507 */ 508 for (i = 0, ptr = buf + sizeof(*ipl); i < cnt; i++) { 509 if (types[i] == 0) { 510 bcopy(items[i], ptr, itemsz[i]); 511 } else if (types[i] == 1) { 512 COPYDATA(items[i], 0, itemsz[i], (char *)ptr); 513 } 514 ptr += itemsz[i]; 515 } 516 SPL_NET(s); 517 MUTEX_ENTER(&ipl_mutex); 518 ipll[dev] = ipl; 519 *iplh[dev] = ipl; 520 iplh[dev] = &ipl->ipl_next; 521 522 /* 523 * Now that the log record has been completed and added to the queue, 524 * wake up any listeners who may want to read it. 525 */ 526# if SOLARIS && defined(_KERNEL) 527 cv_signal(&iplwait); 528 MUTEX_EXIT(&ipl_mutex); 529 pollwakeup(&iplpollhead[dev], POLLRDNORM); 530# else 531 MUTEX_EXIT(&ipl_mutex); 532 WAKEUP(iplh, dev); 533 POLLWAKEUP(dev); 534# endif 535 SPL_X(s); 536# ifdef IPL_SELECT 537 iplog_input_ready(dev); 538# endif 539 return 0; 540} 541 542 543/* ------------------------------------------------------------------------ */ 544/* Function: ipflog_read */ 545/* Returns: int - 0 == success, else error value. */ 546/* Parameters: unit(I) - device we are reading from */ 547/* uio(O) - pointer to information about where to store data */ 548/* */ 549/* Called to handle a read on an IPFilter device. Returns only complete */ 550/* log messages - will not partially copy a log record out to userland. */ 551/* */ 552/* NOTE: This function will block and wait for a signal to return data if */ 553/* there is none present. Asynchronous I/O is not implemented. */ 554/* ------------------------------------------------------------------------ */ 555int ipflog_read(unit, uio) 556minor_t unit; 557struct uio *uio; 558{ 559 size_t dlen, copied; 560 int error = 0; 561 iplog_t *ipl; 562 SPL_INT(s); 563 564 /* 565 * Sanity checks. Make sure the minor # is valid and we're copying 566 * a valid chunk of data. 567 */ 568 if (IPL_LOGMAX < unit) 569 return ENXIO; 570 if (uio->uio_resid == 0) 571 return 0; 572 if ((uio->uio_resid < sizeof(iplog_t)) || 573 (uio->uio_resid > ipl_logsize)) 574 return EINVAL; 575 576 /* 577 * Lock the log so we can snapshot the variables. Wait for a signal 578 * if the log is empty. 579 */ 580 SPL_NET(s); 581 MUTEX_ENTER(&ipl_mutex); 582 583 while (iplt[unit] == NULL) { 584# if SOLARIS && defined(_KERNEL) 585 if (!cv_wait_sig(&iplwait, &ipl_mutex.ipf_lk)) { 586 MUTEX_EXIT(&ipl_mutex); 587 return EINTR; 588 } 589# else 590# if defined(__hpux) && defined(_KERNEL) 591 lock_t *l; 592 593# ifdef IPL_SELECT 594 if (uio->uio_fpflags & (FNBLOCK|FNDELAY)) { 595 /* this is no blocking system call */ 596 MUTEX_EXIT(&ipl_mutex); 597 return 0; 598 } 599# endif 600 601 MUTEX_EXIT(&ipl_mutex); 602 l = get_sleep_lock(&iplh[unit]); 603 error = sleep(&iplh[unit], PZERO+1); 604 spinunlock(l); 605# else 606# if defined(__osf__) && defined(_KERNEL) 607 error = mpsleep(&iplh[unit], PSUSP|PCATCH, "iplread", 0, 608 &ipl_mutex, MS_LOCK_SIMPLE); 609# else 610 MUTEX_EXIT(&ipl_mutex); 611 SPL_X(s); 612 error = SLEEP(unit + iplh, "ipl sleep"); 613# endif /* __osf__ */ 614# endif /* __hpux */ 615 if (error) 616 return error; 617 SPL_NET(s); 618 MUTEX_ENTER(&ipl_mutex); 619# endif /* SOLARIS */ 620 } 621 622# if (BSD >= 199101) || defined(__FreeBSD__) || defined(__osf__) 623 uio->uio_rw = UIO_READ; 624# endif 625 626 for (copied = 0; (ipl = iplt[unit]) != NULL; copied += dlen) { 627 dlen = ipl->ipl_dsize; 628 if (dlen > uio->uio_resid) 629 break; 630 /* 631 * Don't hold the mutex over the uiomove call. 632 */ 633 iplt[unit] = ipl->ipl_next; 634 iplused[unit] -= dlen; 635 MUTEX_EXIT(&ipl_mutex); 636 SPL_X(s); 637 error = UIOMOVE(ipl, dlen, UIO_READ, uio); 638 if (error) { 639 SPL_NET(s); 640 MUTEX_ENTER(&ipl_mutex); 641 ipl->ipl_next = iplt[unit]; 642 iplt[unit] = ipl; 643 iplused[unit] += dlen; 644 break; 645 } 646 MUTEX_ENTER(&ipl_mutex); 647 KFREES(ipl, dlen); 648 SPL_NET(s); 649 } 650 if (!iplt[unit]) { 651 iplused[unit] = 0; 652 iplh[unit] = &iplt[unit]; 653 ipll[unit] = NULL; 654 } 655 656 MUTEX_EXIT(&ipl_mutex); 657 SPL_X(s); 658 return error; 659} 660 661 662/* ------------------------------------------------------------------------ */ 663/* Function: ipflog_clear */ 664/* Returns: int - number of log bytes cleared. */ 665/* Parameters: unit(I) - device we are reading from */ 666/* */ 667/* Deletes all queued up log records for a given output device. */ 668/* ------------------------------------------------------------------------ */ 669int ipflog_clear(unit) 670minor_t unit; 671{ 672 iplog_t *ipl; 673 int used; 674 SPL_INT(s); 675 676 SPL_NET(s); 677 MUTEX_ENTER(&ipl_mutex); 678 while ((ipl = iplt[unit]) != NULL) { 679 iplt[unit] = ipl->ipl_next; 680 KFREES(ipl, ipl->ipl_dsize); 681 } 682 iplh[unit] = &iplt[unit]; 683 ipll[unit] = NULL; 684 used = iplused[unit]; 685 iplused[unit] = 0; 686 bzero((char *)&iplcrc[unit], FI_CSIZE); 687 MUTEX_EXIT(&ipl_mutex); 688 SPL_X(s); 689 return used; 690} 691 692 693/* ------------------------------------------------------------------------ */ 694/* Function: ipflog_canread */ 695/* Returns: int - 0 == no data to read, 1 = data present */ 696/* Parameters: unit(I) - device we are reading from */ 697/* */ 698/* Returns an indication of whether or not there is data present in the */ 699/* current buffer for the selected ipf device. */ 700/* ------------------------------------------------------------------------ */ 701int ipflog_canread(unit) 702int unit; 703{ 704 return iplt[unit] != NULL; 705} 706#endif /* IPFILTER_LOG */ 707