1 /* $FreeBSD$ */
2
3 /*
4 * Copyright (C) 2012 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(__FreeBSD__) && !defined(_KERNEL)
19 # include <osreldate.h>
20 #endif
21 #ifndef SOLARIS
22 # define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
23 #endif
24 #include <sys/errno.h>
25 #include <sys/types.h>
26 #include <sys/file.h>
27 #ifndef _KERNEL
28 # include <stdio.h>
29 # include <string.h>
30 # include <stdlib.h>
31 # include <ctype.h>
32 # define _KERNEL
33 # define KERNEL
34 # ifdef __OpenBSD__
35 struct file;
36 # endif
37 # include <sys/uio.h>
38 # undef _KERNEL
39 # undef KERNEL
40 #endif
41 #if (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)) && \
42 defined(_KERNEL)
43 # include <sys/fcntl.h>
44 # include <sys/filio.h>
45 #else
46 # include <sys/ioctl.h>
47 #endif
48 #include <sys/time.h>
49 #if defined(_KERNEL)
50 # include <sys/systm.h>
51 # if (defined(NetBSD) && (__NetBSD_Version__ >= 104000000))
52 # include <sys/proc.h>
53 # endif
54 #endif /* _KERNEL */
55 #if !SOLARIS && !defined(__hpux) && !defined(linux)
56 # if (defined(NetBSD) && (NetBSD > 199609)) || \
57 (defined(OpenBSD) && (OpenBSD > 199603)) || \
58 (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
59 # include <sys/dirent.h>
60 # else
61 # include <sys/dir.h>
62 # endif
63 # include <sys/mbuf.h>
64 # include <sys/select.h>
65 # if __FreeBSD_version >= 500000
66 # include <sys/selinfo.h>
67 # endif
68 #else
69 # if !defined(__hpux) && defined(_KERNEL)
70 # include <sys/filio.h>
71 # include <sys/cred.h>
72 # include <sys/ddi.h>
73 # include <sys/sunddi.h>
74 # include <sys/ksynch.h>
75 # include <sys/kmem.h>
76 # include <sys/mkdev.h>
77 # include <sys/dditypes.h>
78 # include <sys/cmn_err.h>
79 # endif /* !__hpux */
80 #endif /* !SOLARIS && !__hpux */
81 #if !defined(linux)
82 # include <sys/protosw.h>
83 #endif
84 #include <sys/socket.h>
85
86 #include <net/if.h>
87 #ifdef sun
88 # include <net/af.h>
89 #endif
90 #if __FreeBSD_version >= 300000
91 # include <net/if_var.h>
92 #endif
93 #include <netinet/in.h>
94 #ifdef __sgi
95 # include <sys/ddi.h>
96 # ifdef IFF_DRVRLOCK /* IRIX6 */
97 # include <sys/hashing.h>
98 # endif
99 #endif
100 #if !defined(__hpux) && !defined(linux) && \
101 !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /*IRIX<6*/
102 # include <netinet/in_var.h>
103 #endif
104 #include <netinet/in_systm.h>
105 #include <netinet/ip.h>
106 #include <netinet/tcp.h>
107 #include <netinet/udp.h>
108 #include <netinet/ip_icmp.h>
109 #ifdef USE_INET6
110 # include <netinet/icmp6.h>
111 #endif
112 #if !defined(linux)
113 # include <netinet/ip_var.h>
114 #endif
115 #ifndef _KERNEL
116 # include <syslog.h>
117 #endif
118 #include "netinet/ip_compat.h"
119 #include <netinet/tcpip.h>
120 #include "netinet/ip_fil.h"
121 #include "netinet/ip_nat.h"
122 #include "netinet/ip_frag.h"
123 #include "netinet/ip_state.h"
124 #include "netinet/ip_auth.h"
125 #if (__FreeBSD_version >= 300000) || defined(__NetBSD__)
126 # include <sys/malloc.h>
127 #endif
128 /* END OF INCLUDES */
129
130 #ifdef IPFILTER_LOG
131
132 # if defined(IPL_SELECT)
133 # include <machine/sys/user.h>
134 # include <sys/kthread_iface.h>
135 # define READ_COLLISION 0x001
136 extern int selwait;
137 # endif /* IPL_SELECT */
138
139 typedef struct ipf_log_softc_s {
140 ipfmutex_t ipl_mutex[IPL_LOGSIZE];
141 # if SOLARIS && defined(_KERNEL)
142 kcondvar_t ipl_wait[IPL_LOGSIZE];
143 # endif
144 # if defined(linux) && defined(_KERNEL)
145 wait_queue_head_t iplh_linux[IPL_LOGSIZE];
146 # endif
147 # if defined(__hpux) && defined(_KERNEL)
148 iplog_select_t ipl_ss[IPL_LOGSIZE];
149 # endif
150 iplog_t **iplh[IPL_LOGSIZE];
151 iplog_t *iplt[IPL_LOGSIZE];
152 iplog_t *ipll[IPL_LOGSIZE];
153 u_long ipl_logfail[IPL_LOGSIZE];
154 u_long ipl_logok[IPL_LOGSIZE];
155 fr_info_t ipl_crc[IPL_LOGSIZE];
156 u_32_t ipl_counter[IPL_LOGSIZE];
157 int ipl_suppress;
158 int ipl_logall;
159 int ipl_log_init;
160 int ipl_logsize;
161 int ipl_used[IPL_LOGSIZE];
162 int ipl_magic[IPL_LOGSIZE];
163 ipftuneable_t *ipf_log_tune;
164 int ipl_readers[IPL_LOGSIZE];
165 } ipf_log_softc_t;
166
167 static int magic[IPL_LOGSIZE] = { IPL_MAGIC, IPL_MAGIC_NAT, IPL_MAGIC_STATE,
168 IPL_MAGIC, IPL_MAGIC, IPL_MAGIC,
169 IPL_MAGIC, IPL_MAGIC };
170
171 static ipftuneable_t ipf_log_tuneables[] = {
172 /* log */
173 { { (void *)offsetof(ipf_log_softc_t, ipl_suppress) },
174 "log_suppress", 0, 1,
175 stsizeof(ipf_log_softc_t, ipl_suppress),
176 0, NULL, NULL },
177 { { (void *)offsetof(ipf_log_softc_t, ipl_logall) },
178 "log_all", 0, 1,
179 stsizeof(ipf_log_softc_t, ipl_logall),
180 0, NULL, NULL },
181 { { (void *)offsetof(ipf_log_softc_t, ipl_logsize) },
182 "log_size", 0, 0x80000,
183 stsizeof(ipf_log_softc_t, ipl_logsize),
184 0, NULL, NULL },
185 { { NULL }, NULL, 0, 0,
186 0,
187 0, NULL, NULL }
188 };
189
190
191 int
ipf_log_main_load()192 ipf_log_main_load()
193 {
194 return 0;
195 }
196
197
198 int
ipf_log_main_unload()199 ipf_log_main_unload()
200 {
201 return 0;
202 }
203
204 /* ------------------------------------------------------------------------ */
205 /* Function: ipf_log_soft_create */
206 /* Returns: void * - NULL = failure, else pointer to log context data */
207 /* Parameters: softc(I) - pointer to soft context main structure */
208 /* */
209 /* Initialise log buffers & pointers. Also iniialised the CRC to a local */
210 /* secret for use in calculating the "last log checksum". */
211 /* ------------------------------------------------------------------------ */
212 void *
ipf_log_soft_create(softc)213 ipf_log_soft_create(softc)
214 ipf_main_softc_t *softc;
215 {
216 ipf_log_softc_t *softl;
217 int i;
218
219 KMALLOC(softl, ipf_log_softc_t *);
220 if (softl == NULL)
221 return NULL;
222
223 bzero((char *)softl, sizeof(*softl));
224 bcopy((char *)magic, (char *)softl->ipl_magic, sizeof(magic));
225
226 softl->ipf_log_tune = ipf_tune_array_copy(softl,
227 sizeof(ipf_log_tuneables),
228 ipf_log_tuneables);
229 if (softl->ipf_log_tune == NULL) {
230 ipf_log_soft_destroy(softc, softl);
231 return NULL;
232 }
233 if (ipf_tune_array_link(softc, softl->ipf_log_tune) == -1) {
234 ipf_log_soft_destroy(softc, softl);
235 return NULL;
236 }
237
238 for (i = IPL_LOGMAX; i >= 0; i--) {
239 MUTEX_INIT(&softl->ipl_mutex[i], "ipf log mutex");
240 }
241
242 softl->ipl_suppress = 1;
243 softl->ipl_logall = 0;
244 softl->ipl_log_init = 0;
245 softl->ipl_logsize = IPFILTER_LOGSIZE;
246
247 return softl;
248 }
249
250 /* ------------------------------------------------------------------------ */
251 /* Function: ipf_log_soft_init */
252 /* Returns: int - 0 == success (always returned) */
253 /* Parameters: softc(I) - pointer to soft context main structure */
254 /* */
255 /* Initialise log buffers & pointers. Also iniialised the CRC to a local */
256 /* secret for use in calculating the "last log checksum". */
257 /* ------------------------------------------------------------------------ */
258 int
ipf_log_soft_init(softc,arg)259 ipf_log_soft_init(softc, arg)
260 ipf_main_softc_t *softc;
261 void *arg;
262 {
263 ipf_log_softc_t *softl = arg;
264 int i;
265
266 for (i = IPL_LOGMAX; i >= 0; i--) {
267 softl->iplt[i] = NULL;
268 softl->ipll[i] = NULL;
269 softl->iplh[i] = &softl->iplt[i];
270 bzero((char *)&softl->ipl_crc[i], sizeof(softl->ipl_crc[i]));
271 # ifdef IPL_SELECT
272 softl->iplog_ss[i].read_waiter = 0;
273 softl->iplog_ss[i].state = 0;
274 # endif
275 }
276
277
278 softl->ipl_log_init = 1;
279
280 return 0;
281 }
282
283
284 /* ------------------------------------------------------------------------ */
285 /* Function: ipf_log_soft_fini */
286 /* Parameters: softc(I) - pointer to soft context main structure */
287 /* arg(I) - pointer to log context structure */
288 /* */
289 /* Clean up any log data that has accumulated without being read. */
290 /* ------------------------------------------------------------------------ */
291 int
ipf_log_soft_fini(softc,arg)292 ipf_log_soft_fini(softc, arg)
293 ipf_main_softc_t *softc;
294 void *arg;
295 {
296 ipf_log_softc_t *softl = arg;
297 int i;
298
299 if (softl->ipl_log_init == 0)
300 return 0;
301
302 softl->ipl_log_init = 0;
303
304 for (i = IPL_LOGMAX; i >= 0; i--) {
305 (void) ipf_log_clear(softc, i);
306
307 /*
308 * This is a busy-wait loop so as to avoid yet another lock
309 * to wait on.
310 */
311 MUTEX_ENTER(&softl->ipl_mutex[i]);
312 while (softl->ipl_readers[i] > 0) {
313 # if SOLARIS && defined(_KERNEL)
314 cv_broadcast(&softl->ipl_wait[i]);
315 MUTEX_EXIT(&softl->ipl_mutex[i]);
316 delay(100);
317 pollwakeup(&softc->ipf_poll_head[i], POLLRDNORM);
318 # else
319 MUTEX_EXIT(&softl->ipl_mutex[i]);
320 WAKEUP(softl->iplh, i);
321 POLLWAKEUP(i);
322 # endif
323 MUTEX_ENTER(&softl->ipl_mutex[i]);
324 }
325 MUTEX_EXIT(&softl->ipl_mutex[i]);
326 }
327
328 return 0;
329 }
330
331
332 /* ------------------------------------------------------------------------ */
333 /* Function: ipf_log_soft_destroy */
334 /* Parameters: softc(I) - pointer to soft context main structure */
335 /* arg(I) - pointer to log context structure */
336 /* */
337 /* When this function is called, it is expected that there are no longer */
338 /* any threads active in the reading code path or the logging code path. */
339 /* ------------------------------------------------------------------------ */
340 void
ipf_log_soft_destroy(softc,arg)341 ipf_log_soft_destroy(softc, arg)
342 ipf_main_softc_t *softc;
343 void *arg;
344 {
345 ipf_log_softc_t *softl = arg;
346 int i;
347
348 for (i = IPL_LOGMAX; i >= 0; i--) {
349 # if SOLARIS && defined(_KERNEL)
350 cv_destroy(&softl->ipl_wait[i]);
351 # endif
352 MUTEX_DESTROY(&softl->ipl_mutex[i]);
353 }
354
355 if (softl->ipf_log_tune != NULL) {
356 ipf_tune_array_unlink(softc, softl->ipf_log_tune);
357 KFREES(softl->ipf_log_tune, sizeof(ipf_log_tuneables));
358 softl->ipf_log_tune = NULL;
359 }
360
361 KFREE(softl);
362 }
363
364
365 /* ------------------------------------------------------------------------ */
366 /* Function: ipf_log_pkt */
367 /* Returns: int - 0 == success, -1 == failure */
368 /* Parameters: fin(I) - pointer to packet information */
369 /* flags(I) - flags from filter rules */
370 /* */
371 /* Create a log record for a packet given that it has been triggered by a */
372 /* rule (or the default setting). Calculate the transport protocol header */
373 /* size using predetermined size of a couple of popular protocols and thus */
374 /* how much data to copy into the log, including part of the data body if */
375 /* requested. */
376 /* ------------------------------------------------------------------------ */
377 int
ipf_log_pkt(fin,flags)378 ipf_log_pkt(fin, flags)
379 fr_info_t *fin;
380 u_int flags;
381 {
382 ipf_main_softc_t *softc = fin->fin_main_soft;
383 ipf_log_softc_t *softl = softc->ipf_log_soft;
384 register size_t hlen;
385 int types[2], mlen;
386 size_t sizes[2];
387 void *ptrs[2];
388 ipflog_t ipfl;
389 u_char p;
390 mb_t *m;
391 # if (SOLARIS || defined(__hpux)) && defined(_KERNEL) && !defined(FW_HOOKS)
392 qif_t *ifp;
393 # else
394 struct ifnet *ifp;
395 # endif /* SOLARIS || __hpux */
396
397 m = fin->fin_m;
398 if (m == NULL)
399 return -1;
400
401 ipfl.fl_nattag.ipt_num[0] = 0;
402 ifp = fin->fin_ifp;
403 hlen = (char *)fin->fin_dp - (char *)fin->fin_ip;
404
405 /*
406 * calculate header size.
407 */
408 if (fin->fin_off == 0) {
409 p = fin->fin_fi.fi_p;
410 if (p == IPPROTO_TCP)
411 hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen);
412 else if (p == IPPROTO_UDP)
413 hlen += MIN(sizeof(udphdr_t), fin->fin_dlen);
414 else if (p == IPPROTO_ICMP) {
415 struct icmp *icmp;
416
417 icmp = (struct icmp *)fin->fin_dp;
418
419 /*
420 * For ICMP, if the packet is an error packet, also
421 * include the information about the packet which
422 * caused the error.
423 */
424 switch (icmp->icmp_type)
425 {
426 case ICMP_UNREACH :
427 case ICMP_SOURCEQUENCH :
428 case ICMP_REDIRECT :
429 case ICMP_TIMXCEED :
430 case ICMP_PARAMPROB :
431 hlen += MIN(sizeof(struct icmp) + 8,
432 fin->fin_dlen);
433 break;
434 default :
435 hlen += MIN(sizeof(struct icmp),
436 fin->fin_dlen);
437 break;
438 }
439 }
440 # ifdef USE_INET6
441 else if (p == IPPROTO_ICMPV6) {
442 struct icmp6_hdr *icmp;
443
444 icmp = (struct icmp6_hdr *)fin->fin_dp;
445
446 /*
447 * For ICMPV6, if the packet is an error packet, also
448 * include the information about the packet which
449 * caused the error.
450 */
451 if (icmp->icmp6_type < 128) {
452 hlen += MIN(sizeof(struct icmp6_hdr) + 8,
453 fin->fin_dlen);
454 } else {
455 hlen += MIN(sizeof(struct icmp6_hdr),
456 fin->fin_dlen);
457 }
458 }
459 # endif
460 }
461 /*
462 * Get the interface number and name to which this packet is
463 * currently associated.
464 */
465 # if (SOLARIS || defined(__hpux)) && defined(_KERNEL)
466 # if !defined(FW_HOOKS)
467 ipfl.fl_unit = (u_int)ifp->qf_ppa;
468 # endif
469 COPYIFNAME(fin->fin_v, ifp, ipfl.fl_ifname);
470 # else
471 # if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \
472 OPENBSD_GE_REV(199603) || defined(linux) || FREEBSD_GE_REV(501113)
473 COPYIFNAME(fin->fin_v, ifp, ipfl.fl_ifname);
474 # else
475 ipfl.fl_unit = (u_int)ifp->if_unit;
476 # if defined(_KERNEL)
477 if ((ipfl.fl_ifname[0] = ifp->if_name[0]))
478 if ((ipfl.fl_ifname[1] = ifp->if_name[1]))
479 if ((ipfl.fl_ifname[2] = ifp->if_name[2]))
480 ipfl.fl_ifname[3] = ifp->if_name[3];
481 # else
482 (void) strncpy(ipfl.fl_ifname, IFNAME(ifp), sizeof(ipfl.fl_ifname));
483 ipfl.fl_ifname[sizeof(ipfl.fl_ifname) - 1] = '\0';
484 # endif
485 # endif
486 # endif /* __hpux || SOLARIS */
487 mlen = fin->fin_plen - hlen;
488 if (!softl->ipl_logall) {
489 mlen = (flags & FR_LOGBODY) ? MIN(mlen, 128) : 0;
490 } else if ((flags & FR_LOGBODY) == 0) {
491 mlen = 0;
492 }
493 if (mlen < 0)
494 mlen = 0;
495 ipfl.fl_plen = (u_char)mlen;
496 ipfl.fl_hlen = (u_char)hlen;
497 ipfl.fl_rule = fin->fin_rule;
498 (void) strncpy(ipfl.fl_group, fin->fin_group, FR_GROUPLEN);
499 if (fin->fin_fr != NULL) {
500 ipfl.fl_loglevel = fin->fin_fr->fr_loglevel;
501 ipfl.fl_logtag = fin->fin_fr->fr_logtag;
502 } else {
503 ipfl.fl_loglevel = 0xffff;
504 ipfl.fl_logtag = FR_NOLOGTAG;
505 }
506 if (fin->fin_nattag != NULL)
507 bcopy(fin->fin_nattag, (void *)&ipfl.fl_nattag,
508 sizeof(ipfl.fl_nattag));
509 ipfl.fl_flags = flags;
510 ipfl.fl_breason = (fin->fin_reason & 0xff);
511 ipfl.fl_dir = fin->fin_out;
512 ipfl.fl_lflags = fin->fin_flx;
513 ipfl.fl_family = fin->fin_family;
514 ptrs[0] = (void *)&ipfl;
515 sizes[0] = sizeof(ipfl);
516 types[0] = 0;
517 # if defined(MENTAT) && defined(_KERNEL)
518 /*
519 * Are we copied from the mblk or an aligned array ?
520 */
521 if (fin->fin_ip == (ip_t *)m->b_rptr) {
522 ptrs[1] = m;
523 sizes[1] = hlen + mlen;
524 types[1] = 1;
525 } else {
526 ptrs[1] = fin->fin_ip;
527 sizes[1] = hlen + mlen;
528 types[1] = 0;
529 }
530 # else
531 ptrs[1] = m;
532 sizes[1] = hlen + mlen;
533 types[1] = 1;
534 # endif /* MENTAT */
535 return ipf_log_items(softc, IPL_LOGIPF, fin, ptrs, sizes, types, 2);
536 }
537
538
539 /* ------------------------------------------------------------------------ */
540 /* Function: ipf_log_items */
541 /* Returns: int - 0 == success, -1 == failure */
542 /* Parameters: softc(I) - pointer to main soft context */
543 /* unit(I) - device we are reading from */
544 /* fin(I) - pointer to packet information */
545 /* items(I) - array of pointers to log data */
546 /* itemsz(I) - array of size of valid memory pointed to */
547 /* types(I) - type of data pointed to by items pointers */
548 /* cnt(I) - number of elements in arrays items/itemsz/types */
549 /* */
550 /* Takes an array of parameters and constructs one record to include the */
551 /* miscellaneous packet information, as well as packet data, for reading */
552 /* from the log device. */
553 /* ------------------------------------------------------------------------ */
554 int
ipf_log_items(softc,unit,fin,items,itemsz,types,cnt)555 ipf_log_items(softc, unit, fin, items, itemsz, types, cnt)
556 ipf_main_softc_t *softc;
557 int unit;
558 fr_info_t *fin;
559 void **items;
560 size_t *itemsz;
561 int *types, cnt;
562 {
563 ipf_log_softc_t *softl = softc->ipf_log_soft;
564 caddr_t buf, ptr;
565 iplog_t *ipl;
566 size_t len;
567 int i;
568 SPL_INT(s);
569
570 /*
571 * Get the total amount of data to be logged.
572 */
573 for (i = 0, len = sizeof(iplog_t); i < cnt; i++)
574 len += itemsz[i];
575
576 SPL_NET(s);
577 MUTEX_ENTER(&softl->ipl_mutex[unit]);
578 softl->ipl_counter[unit]++;
579 /*
580 * check that we have space to record this information and can
581 * allocate that much.
582 */
583 if ((softl->ipl_used[unit] + len) > softl->ipl_logsize) {
584 softl->ipl_logfail[unit]++;
585 MUTEX_EXIT(&softl->ipl_mutex[unit]);
586 return -1;
587 }
588
589 KMALLOCS(buf, caddr_t, len);
590 if (buf == NULL) {
591 softl->ipl_logfail[unit]++;
592 MUTEX_EXIT(&softl->ipl_mutex[unit]);
593 return -1;
594 }
595 ipl = (iplog_t *)buf;
596 ipl->ipl_magic = softl->ipl_magic[unit];
597 ipl->ipl_count = 1;
598 ipl->ipl_seqnum = softl->ipl_counter[unit];
599 ipl->ipl_next = NULL;
600 ipl->ipl_dsize = len;
601 #ifdef _KERNEL
602 GETKTIME(&ipl->ipl_sec);
603 #else
604 ipl->ipl_sec = 0;
605 ipl->ipl_usec = 0;
606 #endif
607
608 /*
609 * Loop through all the items to be logged, copying each one to the
610 * buffer. Use bcopy for normal data or the mb_t copyout routine.
611 */
612 for (i = 0, ptr = buf + sizeof(*ipl); i < cnt; i++) {
613 if (types[i] == 0) {
614 bcopy(items[i], ptr, itemsz[i]);
615 } else if (types[i] == 1) {
616 COPYDATA(items[i], 0, itemsz[i], ptr);
617 }
618 ptr += itemsz[i];
619 }
620 /*
621 * Check to see if this log record has a CRC which matches the last
622 * record logged. If it does, just up the count on the previous one
623 * rather than create a new one.
624 */
625 if (softl->ipl_suppress) {
626 if ((fin != NULL) && (fin->fin_off == 0)) {
627 if ((softl->ipll[unit] != NULL) &&
628 (fin->fin_crc == softl->ipl_crc[unit].fin_crc) &&
629 bcmp((char *)fin, (char *)&softl->ipl_crc[unit],
630 FI_LCSIZE) == 0) {
631 softl->ipll[unit]->ipl_count++;
632 MUTEX_EXIT(&softl->ipl_mutex[unit]);
633 SPL_X(s);
634 KFREES(buf, len);
635 return 0;
636 }
637 bcopy((char *)fin, (char *)&softl->ipl_crc[unit],
638 FI_LCSIZE);
639 softl->ipl_crc[unit].fin_crc = fin->fin_crc;
640 } else
641 bzero((char *)&softl->ipl_crc[unit], FI_CSIZE);
642 }
643
644 /*
645 * advance the log pointer to the next empty record and deduct the
646 * amount of space we're going to use.
647 */
648 softl->ipl_logok[unit]++;
649 softl->ipll[unit] = ipl;
650 *softl->iplh[unit] = ipl;
651 softl->iplh[unit] = &ipl->ipl_next;
652 softl->ipl_used[unit] += len;
653
654 /*
655 * Now that the log record has been completed and added to the queue,
656 * wake up any listeners who may want to read it.
657 */
658 # if SOLARIS && defined(_KERNEL)
659 cv_signal(&softl->ipl_wait[unit]);
660 MUTEX_EXIT(&softl->ipl_mutex[unit]);
661 pollwakeup(&softc->ipf_poll_head[unit], POLLRDNORM);
662 # else
663 MUTEX_EXIT(&softl->ipl_mutex[unit]);
664 WAKEUP(softl->iplh, unit);
665 POLLWAKEUP(unit);
666 # endif
667 SPL_X(s);
668 # ifdef IPL_SELECT
669 iplog_input_ready(unit);
670 # endif
671 return 0;
672 }
673
674
675 /* ------------------------------------------------------------------------ */
676 /* Function: ipf_log_read */
677 /* Returns: int - 0 == success, else error value. */
678 /* Parameters: softc(I) - pointer to main soft context */
679 /* unit(I) - device we are reading from */
680 /* uio(O) - pointer to information about where to store data */
681 /* */
682 /* Called to handle a read on an IPFilter device. Returns only complete */
683 /* log messages - will not partially copy a log record out to userland. */
684 /* */
685 /* NOTE: This function will block and wait for a signal to return data if */
686 /* there is none present. Asynchronous I/O is not implemented. */
687 /* ------------------------------------------------------------------------ */
688 int
ipf_log_read(softc,unit,uio)689 ipf_log_read(softc, unit, uio)
690 ipf_main_softc_t *softc;
691 minor_t unit;
692 struct uio *uio;
693 {
694 ipf_log_softc_t *softl = softc->ipf_log_soft;
695 size_t dlen, copied;
696 int error = 0;
697 iplog_t *ipl;
698 SPL_INT(s);
699
700 if (softl->ipl_log_init == 0) {
701 IPFERROR(40007);
702 return 0;
703 }
704
705 /*
706 * Sanity checks. Make sure the minor # is valid and we're copying
707 * a valid chunk of data.
708 */
709 if (IPL_LOGMAX < unit) {
710 IPFERROR(40001);
711 return ENXIO;
712 }
713 if (uio->uio_resid == 0)
714 return 0;
715
716 if (uio->uio_resid < sizeof(iplog_t)) {
717 IPFERROR(40002);
718 return EINVAL;
719 }
720 if (uio->uio_resid > softl->ipl_logsize) {
721 IPFERROR(40005);
722 return EINVAL;
723 }
724
725 /*
726 * Lock the log so we can snapshot the variables. Wait for a signal
727 * if the log is empty.
728 */
729 SPL_NET(s);
730 MUTEX_ENTER(&softl->ipl_mutex[unit]);
731 softl->ipl_readers[unit]++;
732
733 while (softl->ipl_log_init == 1 && softl->iplt[unit] == NULL) {
734 # if SOLARIS && defined(_KERNEL)
735 if (!cv_wait_sig(&softl->ipl_wait[unit],
736 &softl->ipl_mutex[unit].ipf_lk)) {
737 softl->ipl_readers[unit]--;
738 MUTEX_EXIT(&softl->ipl_mutex[unit]);
739 IPFERROR(40003);
740 return EINTR;
741 }
742 # else
743 # if defined(__hpux) && defined(_KERNEL)
744 lock_t *l;
745
746 # ifdef IPL_SELECT
747 if (uio->uio_fpflags & (FNBLOCK|FNDELAY)) {
748 /* this is no blocking system call */
749 softl->ipl_readers[unit]--;
750 MUTEX_EXIT(&softl->ipl_mutex[unit]);
751 return 0;
752 }
753 # endif
754
755 MUTEX_EXIT(&softl->ipl_mutex[unit]);
756 l = get_sleep_lock(&softl->iplh[unit]);
757 error = sleep(&softl->iplh[unit], PZERO+1);
758 spinunlock(l);
759 # else
760 # if defined(__osf__) && defined(_KERNEL)
761 error = mpsleep(&softl->iplh[unit], PSUSP|PCATCH, "ipfread", 0,
762 &softl->ipl_mutex, MS_LOCK_SIMPLE);
763 # else
764 MUTEX_EXIT(&softl->ipl_mutex[unit]);
765 SPL_X(s);
766 error = SLEEP(unit + softl->iplh, "ipl sleep");
767 # endif /* __osf__ */
768 # endif /* __hpux */
769 SPL_NET(s);
770 MUTEX_ENTER(&softl->ipl_mutex[unit]);
771 if (error) {
772 softl->ipl_readers[unit]--;
773 MUTEX_EXIT(&softl->ipl_mutex[unit]);
774 IPFERROR(40004);
775 return error;
776 }
777 # endif /* SOLARIS */
778 }
779 if (softl->ipl_log_init != 1) {
780 softl->ipl_readers[unit]--;
781 MUTEX_EXIT(&softl->ipl_mutex[unit]);
782 IPFERROR(40008);
783 return EIO;
784 }
785
786 # if (defined(BSD) && (BSD >= 199101)) || defined(__FreeBSD__) || \
787 defined(__osf__)
788 uio->uio_rw = UIO_READ;
789 # endif
790
791 for (copied = 0; (ipl = softl->iplt[unit]) != NULL; copied += dlen) {
792 dlen = ipl->ipl_dsize;
793 if (dlen > uio->uio_resid)
794 break;
795 /*
796 * Don't hold the mutex over the uiomove call.
797 */
798 softl->iplt[unit] = ipl->ipl_next;
799 softl->ipl_used[unit] -= dlen;
800 MUTEX_EXIT(&softl->ipl_mutex[unit]);
801 SPL_X(s);
802 error = UIOMOVE(ipl, dlen, UIO_READ, uio);
803 if (error) {
804 SPL_NET(s);
805 MUTEX_ENTER(&softl->ipl_mutex[unit]);
806 IPFERROR(40006);
807 ipl->ipl_next = softl->iplt[unit];
808 softl->iplt[unit] = ipl;
809 softl->ipl_used[unit] += dlen;
810 break;
811 }
812 MUTEX_ENTER(&softl->ipl_mutex[unit]);
813 KFREES((caddr_t)ipl, dlen);
814 SPL_NET(s);
815 }
816 if (!softl->iplt[unit]) {
817 softl->ipl_used[unit] = 0;
818 softl->iplh[unit] = &softl->iplt[unit];
819 softl->ipll[unit] = NULL;
820 }
821
822 softl->ipl_readers[unit]--;
823 MUTEX_EXIT(&softl->ipl_mutex[unit]);
824 SPL_X(s);
825 return error;
826 }
827
828
829 /* ------------------------------------------------------------------------ */
830 /* Function: ipf_log_clear */
831 /* Returns: int - number of log bytes cleared. */
832 /* Parameters: softc(I) - pointer to main soft context */
833 /* unit(I) - device we are reading from */
834 /* */
835 /* Deletes all queued up log records for a given output device. */
836 /* ------------------------------------------------------------------------ */
837 int
ipf_log_clear(softc,unit)838 ipf_log_clear(softc, unit)
839 ipf_main_softc_t *softc;
840 minor_t unit;
841 {
842 ipf_log_softc_t *softl = softc->ipf_log_soft;
843 iplog_t *ipl;
844 int used;
845 SPL_INT(s);
846
847 SPL_NET(s);
848 MUTEX_ENTER(&softl->ipl_mutex[unit]);
849 while ((ipl = softl->iplt[unit]) != NULL) {
850 softl->iplt[unit] = ipl->ipl_next;
851 KFREES((caddr_t)ipl, ipl->ipl_dsize);
852 }
853 softl->iplh[unit] = &softl->iplt[unit];
854 softl->ipll[unit] = NULL;
855 used = softl->ipl_used[unit];
856 softl->ipl_used[unit] = 0;
857 bzero((char *)&softl->ipl_crc[unit], FI_CSIZE);
858 MUTEX_EXIT(&softl->ipl_mutex[unit]);
859 SPL_X(s);
860 return used;
861 }
862
863
864 /* ------------------------------------------------------------------------ */
865 /* Function: ipf_log_canread */
866 /* Returns: int - 0 == no data to read, 1 = data present */
867 /* Parameters: softc(I) - pointer to main soft context */
868 /* unit(I) - device we are reading from */
869 /* */
870 /* Returns an indication of whether or not there is data present in the */
871 /* current buffer for the selected ipf device. */
872 /* ------------------------------------------------------------------------ */
873 int
ipf_log_canread(softc,unit)874 ipf_log_canread(softc, unit)
875 ipf_main_softc_t *softc;
876 int unit;
877 {
878 ipf_log_softc_t *softl = softc->ipf_log_soft;
879
880 return softl->iplt[unit] != NULL;
881 }
882
883
884 /* ------------------------------------------------------------------------ */
885 /* Function: ipf_log_canread */
886 /* Returns: int - 0 == no data to read, 1 = data present */
887 /* Parameters: softc(I) - pointer to main soft context */
888 /* unit(I) - device we are reading from */
889 /* */
890 /* Returns how many bytes are currently held in log buffers for the */
891 /* selected ipf device. */
892 /* ------------------------------------------------------------------------ */
893 int
ipf_log_bytesused(softc,unit)894 ipf_log_bytesused(softc, unit)
895 ipf_main_softc_t *softc;
896 int unit;
897 {
898 ipf_log_softc_t *softl = softc->ipf_log_soft;
899
900 if (softl == NULL)
901 return 0;
902
903 return softl->ipl_used[unit];
904 }
905
906
907 /* ------------------------------------------------------------------------ */
908 /* Function: ipf_log_failures */
909 /* Returns: U_QUAD_T - number of log failures */
910 /* Parameters: softc(I) - pointer to main soft context */
911 /* unit(I) - device we are reading from */
912 /* */
913 /* Returns how many times we've tried to log a packet but failed to do so */
914 /* for the selected ipf device. */
915 /* ------------------------------------------------------------------------ */
916 u_long
ipf_log_failures(softc,unit)917 ipf_log_failures(softc, unit)
918 ipf_main_softc_t *softc;
919 int unit;
920 {
921 ipf_log_softc_t *softl = softc->ipf_log_soft;
922
923 if (softl == NULL)
924 return 0;
925
926 return softl->ipl_logfail[unit];
927 }
928
929
930 /* ------------------------------------------------------------------------ */
931 /* Function: ipf_log_logok */
932 /* Returns: U_QUAD_T - number of packets logged */
933 /* Parameters: softc(I) - pointer to main soft context */
934 /* unit(I) - device we are reading from */
935 /* */
936 /* Returns how many times we've successfully logged a packet for the */
937 /* selected ipf device. */
938 /* ------------------------------------------------------------------------ */
939 u_long
ipf_log_logok(softc,unit)940 ipf_log_logok(softc, unit)
941 ipf_main_softc_t *softc;
942 int unit;
943 {
944 ipf_log_softc_t *softl = softc->ipf_log_soft;
945
946 if (softl == NULL)
947 return 0;
948
949 return softl->ipl_logok[unit];
950 }
951 #endif /* IPFILTER_LOG */
952