1 /* $FreeBSD: stable/10/sys/contrib/ipfilter/netinet/ip_log.c 341739 2018-12-08 17:28:52Z cy $ */
2
3 /*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 * $FreeBSD: stable/10/sys/contrib/ipfilter/netinet/ip_log.c 341739 2018-12-08 17:28:52Z cy $
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 # if defined(sun) && (defined(__svr4__) || defined(__SVR4))
23 # define SOLARIS 1
24 # else
25 # define SOLARIS 0
26 # endif
27 #endif
28 #include <sys/errno.h>
29 #include <sys/types.h>
30 #include <sys/file.h>
31 #ifndef _KERNEL
32 # include <stdio.h>
33 # include <string.h>
34 # include <stdlib.h>
35 # include <ctype.h>
36 # define _KERNEL
37 # define KERNEL
38 # ifdef __OpenBSD__
39 struct file;
40 # endif
41 # include <sys/uio.h>
42 # undef _KERNEL
43 # undef KERNEL
44 #endif
45 #if (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)) && \
46 defined(_KERNEL)
47 # include <sys/fcntl.h>
48 # include <sys/filio.h>
49 #else
50 # include <sys/ioctl.h>
51 #endif
52 #include <sys/time.h>
53 #if defined(_KERNEL)
54 # include <sys/systm.h>
55 # if (defined(NetBSD) && (__NetBSD_Version__ >= 104000000))
56 # include <sys/proc.h>
57 # endif
58 #endif /* _KERNEL */
59 #if !SOLARIS && !defined(__hpux) && !defined(linux)
60 # if (defined(NetBSD) && (NetBSD > 199609)) || \
61 (defined(OpenBSD) && (OpenBSD > 199603)) || \
62 (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
63 # include <sys/dirent.h>
64 # else
65 # include <sys/dir.h>
66 # endif
67 # include <sys/mbuf.h>
68 # include <sys/select.h>
69 # if __FreeBSD_version >= 500000
70 # include <sys/selinfo.h>
71 # endif
72 #else
73 # if !defined(__hpux) && defined(_KERNEL)
74 # include <sys/filio.h>
75 # include <sys/cred.h>
76 # include <sys/ddi.h>
77 # include <sys/sunddi.h>
78 # include <sys/ksynch.h>
79 # include <sys/kmem.h>
80 # include <sys/mkdev.h>
81 # include <sys/dditypes.h>
82 # include <sys/cmn_err.h>
83 # endif /* !__hpux */
84 #endif /* !SOLARIS && !__hpux */
85 #if !defined(linux)
86 # include <sys/protosw.h>
87 #endif
88 #include <sys/socket.h>
89
90 #include <net/if.h>
91 #ifdef sun
92 # include <net/af.h>
93 #endif
94 #if __FreeBSD_version >= 300000
95 # include <net/if_var.h>
96 #endif
97 #include <netinet/in.h>
98 #ifdef __sgi
99 # include <sys/ddi.h>
100 #endif
101 # include <netinet/in_var.h>
102 #include <netinet/in_systm.h>
103 #include <netinet/ip.h>
104 #include <netinet/tcp.h>
105 #include <netinet/udp.h>
106 #include <netinet/ip_icmp.h>
107 #ifdef USE_INET6
108 # include <netinet/icmp6.h>
109 #endif
110 #if !defined(linux)
111 # include <netinet/ip_var.h>
112 #endif
113 #ifndef _KERNEL
114 # include <syslog.h>
115 #endif
116 #include "netinet/ip_compat.h"
117 #include <netinet/tcpip.h>
118 #include "netinet/ip_fil.h"
119 #include "netinet/ip_nat.h"
120 #include "netinet/ip_frag.h"
121 #include "netinet/ip_state.h"
122 #include "netinet/ip_auth.h"
123 #if (__FreeBSD_version >= 300000) || defined(__NetBSD__)
124 # include <sys/malloc.h>
125 #endif
126 /* END OF INCLUDES */
127
128 #ifdef IPFILTER_LOG
129
130 # if defined(IPL_SELECT)
131 # include <machine/sys/user.h>
132 # include <sys/kthread_iface.h>
133 # define READ_COLLISION 0x001
134 extern int selwait;
135 # endif /* IPL_SELECT */
136
137 typedef struct ipf_log_softc_s {
138 ipfmutex_t ipl_mutex[IPL_LOGSIZE];
139 # if SOLARIS && defined(_KERNEL)
140 kcondvar_t ipl_wait[IPL_LOGSIZE];
141 # endif
142 # if defined(linux) && defined(_KERNEL)
143 wait_queue_head_t iplh_linux[IPL_LOGSIZE];
144 # endif
145 # if defined(__hpux) && defined(_KERNEL)
146 iplog_select_t ipl_ss[IPL_LOGSIZE];
147 # endif
148 iplog_t **iplh[IPL_LOGSIZE];
149 iplog_t *iplt[IPL_LOGSIZE];
150 iplog_t *ipll[IPL_LOGSIZE];
151 u_long ipl_logfail[IPL_LOGSIZE];
152 u_long ipl_logok[IPL_LOGSIZE];
153 fr_info_t ipl_crc[IPL_LOGSIZE];
154 u_32_t ipl_counter[IPL_LOGSIZE];
155 int ipl_suppress;
156 int ipl_logall;
157 int ipl_log_init;
158 int ipl_logsize;
159 int ipl_used[IPL_LOGSIZE];
160 int ipl_magic[IPL_LOGSIZE];
161 ipftuneable_t *ipf_log_tune;
162 int ipl_readers[IPL_LOGSIZE];
163 } ipf_log_softc_t;
164
165 static int magic[IPL_LOGSIZE] = { IPL_MAGIC, IPL_MAGIC_NAT, IPL_MAGIC_STATE,
166 IPL_MAGIC, IPL_MAGIC, IPL_MAGIC,
167 IPL_MAGIC, IPL_MAGIC };
168
169 static ipftuneable_t ipf_log_tuneables[] = {
170 /* log */
171 { { (void *)offsetof(ipf_log_softc_t, ipl_suppress) },
172 "log_suppress", 0, 1,
173 stsizeof(ipf_log_softc_t, ipl_suppress),
174 0, NULL, NULL },
175 { { (void *)offsetof(ipf_log_softc_t, ipl_logall) },
176 "log_all", 0, 1,
177 stsizeof(ipf_log_softc_t, ipl_logall),
178 0, NULL, NULL },
179 { { (void *)offsetof(ipf_log_softc_t, ipl_logsize) },
180 "log_size", 0, 0x80000,
181 stsizeof(ipf_log_softc_t, ipl_logsize),
182 0, NULL, NULL },
183 { { NULL }, NULL, 0, 0,
184 0,
185 0, NULL, NULL }
186 };
187
188
189 int
ipf_log_main_load()190 ipf_log_main_load()
191 {
192 return 0;
193 }
194
195
196 int
ipf_log_main_unload()197 ipf_log_main_unload()
198 {
199 return 0;
200 }
201
202 /* ------------------------------------------------------------------------ */
203 /* Function: ipf_log_soft_create */
204 /* Returns: void * - NULL = failure, else pointer to log context data */
205 /* Parameters: softc(I) - pointer to soft context main structure */
206 /* */
207 /* Initialise log buffers & pointers. Also iniialised the CRC to a local */
208 /* secret for use in calculating the "last log checksum". */
209 /* ------------------------------------------------------------------------ */
210 void *
ipf_log_soft_create(softc)211 ipf_log_soft_create(softc)
212 ipf_main_softc_t *softc;
213 {
214 ipf_log_softc_t *softl;
215 int i;
216
217 KMALLOC(softl, ipf_log_softc_t *);
218 if (softl == NULL)
219 return NULL;
220
221 bzero((char *)softl, sizeof(*softl));
222 bcopy((char *)magic, (char *)softl->ipl_magic, sizeof(magic));
223
224 softl->ipf_log_tune = ipf_tune_array_copy(softl,
225 sizeof(ipf_log_tuneables),
226 ipf_log_tuneables);
227 if (softl->ipf_log_tune == NULL) {
228 ipf_log_soft_destroy(softc, softl);
229 return NULL;
230 }
231 if (ipf_tune_array_link(softc, softl->ipf_log_tune) == -1) {
232 ipf_log_soft_destroy(softc, softl);
233 return NULL;
234 }
235
236 for (i = IPL_LOGMAX; i >= 0; i--) {
237 MUTEX_INIT(&softl->ipl_mutex[i], "ipf log mutex");
238 }
239
240 softl->ipl_suppress = 1;
241 softl->ipl_logall = 0;
242 softl->ipl_log_init = 0;
243 softl->ipl_logsize = IPFILTER_LOGSIZE;
244
245 return softl;
246 }
247
248 /* ------------------------------------------------------------------------ */
249 /* Function: ipf_log_soft_init */
250 /* Returns: int - 0 == success (always returned) */
251 /* Parameters: softc(I) - pointer to soft context main structure */
252 /* */
253 /* Initialise log buffers & pointers. Also iniialised the CRC to a local */
254 /* secret for use in calculating the "last log checksum". */
255 /* ------------------------------------------------------------------------ */
256 int
ipf_log_soft_init(softc,arg)257 ipf_log_soft_init(softc, arg)
258 ipf_main_softc_t *softc;
259 void *arg;
260 {
261 ipf_log_softc_t *softl = arg;
262 int i;
263
264 for (i = IPL_LOGMAX; i >= 0; i--) {
265 softl->iplt[i] = NULL;
266 softl->ipll[i] = NULL;
267 softl->iplh[i] = &softl->iplt[i];
268 bzero((char *)&softl->ipl_crc[i], sizeof(softl->ipl_crc[i]));
269 # ifdef IPL_SELECT
270 softl->iplog_ss[i].read_waiter = 0;
271 softl->iplog_ss[i].state = 0;
272 # endif
273 }
274
275
276 softl->ipl_log_init = 1;
277
278 return 0;
279 }
280
281
282 /* ------------------------------------------------------------------------ */
283 /* Function: ipf_log_soft_fini */
284 /* Parameters: softc(I) - pointer to soft context main structure */
285 /* arg(I) - pointer to log context structure */
286 /* */
287 /* Clean up any log data that has accumulated without being read. */
288 /* ------------------------------------------------------------------------ */
289 int
ipf_log_soft_fini(softc,arg)290 ipf_log_soft_fini(softc, arg)
291 ipf_main_softc_t *softc;
292 void *arg;
293 {
294 ipf_log_softc_t *softl = arg;
295 int i;
296
297 if (softl->ipl_log_init == 0)
298 return 0;
299
300 softl->ipl_log_init = 0;
301
302 for (i = IPL_LOGMAX; i >= 0; i--) {
303 (void) ipf_log_clear(softc, i);
304
305 /*
306 * This is a busy-wait loop so as to avoid yet another lock
307 * to wait on.
308 */
309 MUTEX_ENTER(&softl->ipl_mutex[i]);
310 while (softl->ipl_readers[i] > 0) {
311 # if SOLARIS && defined(_KERNEL)
312 cv_broadcast(&softl->ipl_wait[i]);
313 MUTEX_EXIT(&softl->ipl_mutex[i]);
314 delay(100);
315 pollwakeup(&softc->ipf_poll_head[i], POLLRDNORM);
316 # else
317 MUTEX_EXIT(&softl->ipl_mutex[i]);
318 WAKEUP(softl->iplh, i);
319 POLLWAKEUP(i);
320 # endif
321 MUTEX_ENTER(&softl->ipl_mutex[i]);
322 }
323 MUTEX_EXIT(&softl->ipl_mutex[i]);
324 }
325
326 return 0;
327 }
328
329
330 /* ------------------------------------------------------------------------ */
331 /* Function: ipf_log_soft_destroy */
332 /* Parameters: softc(I) - pointer to soft context main structure */
333 /* arg(I) - pointer to log context structure */
334 /* */
335 /* When this function is called, it is expected that there are no longer */
336 /* any threads active in the reading code path or the logging code path. */
337 /* ------------------------------------------------------------------------ */
338 void
ipf_log_soft_destroy(softc,arg)339 ipf_log_soft_destroy(softc, arg)
340 ipf_main_softc_t *softc;
341 void *arg;
342 {
343 ipf_log_softc_t *softl = arg;
344 int i;
345
346 for (i = IPL_LOGMAX; i >= 0; i--) {
347 # if SOLARIS && defined(_KERNEL)
348 cv_destroy(&softl->ipl_wait[i]);
349 # endif
350 MUTEX_DESTROY(&softl->ipl_mutex[i]);
351 }
352
353 if (softl->ipf_log_tune != NULL) {
354 ipf_tune_array_unlink(softc, softl->ipf_log_tune);
355 KFREES(softl->ipf_log_tune, sizeof(ipf_log_tuneables));
356 softl->ipf_log_tune = NULL;
357 }
358
359 KFREE(softl);
360 }
361
362
363 /* ------------------------------------------------------------------------ */
364 /* Function: ipf_log_pkt */
365 /* Returns: int - 0 == success, -1 == failure */
366 /* Parameters: fin(I) - pointer to packet information */
367 /* flags(I) - flags from filter rules */
368 /* */
369 /* Create a log record for a packet given that it has been triggered by a */
370 /* rule (or the default setting). Calculate the transport protocol header */
371 /* size using predetermined size of a couple of popular protocols and thus */
372 /* how much data to copy into the log, including part of the data body if */
373 /* requested. */
374 /* ------------------------------------------------------------------------ */
375 int
ipf_log_pkt(fin,flags)376 ipf_log_pkt(fin, flags)
377 fr_info_t *fin;
378 u_int flags;
379 {
380 ipf_main_softc_t *softc = fin->fin_main_soft;
381 ipf_log_softc_t *softl = softc->ipf_log_soft;
382 register size_t hlen;
383 int types[2], mlen;
384 size_t sizes[2];
385 void *ptrs[2];
386 ipflog_t ipfl;
387 u_char p;
388 mb_t *m;
389 # if (SOLARIS || defined(__hpux)) && defined(_KERNEL) && !defined(FW_HOOKS)
390 qif_t *ifp;
391 # else
392 struct ifnet *ifp;
393 # endif /* SOLARIS || __hpux */
394
395 m = fin->fin_m;
396 if (m == NULL)
397 return -1;
398
399 ipfl.fl_nattag.ipt_num[0] = 0;
400 ifp = fin->fin_ifp;
401 hlen = (char *)fin->fin_dp - (char *)fin->fin_ip;
402
403 /*
404 * calculate header size.
405 */
406 if (fin->fin_off == 0) {
407 p = fin->fin_fi.fi_p;
408 if (p == IPPROTO_TCP)
409 hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen);
410 else if (p == IPPROTO_UDP)
411 hlen += MIN(sizeof(udphdr_t), fin->fin_dlen);
412 else if (p == IPPROTO_ICMP) {
413 struct icmp *icmp;
414
415 icmp = (struct icmp *)fin->fin_dp;
416
417 /*
418 * For ICMP, if the packet is an error packet, also
419 * include the information about the packet which
420 * caused the error.
421 */
422 switch (icmp->icmp_type)
423 {
424 case ICMP_UNREACH :
425 case ICMP_SOURCEQUENCH :
426 case ICMP_REDIRECT :
427 case ICMP_TIMXCEED :
428 case ICMP_PARAMPROB :
429 hlen += MIN(sizeof(struct icmp) + 8,
430 fin->fin_dlen);
431 break;
432 default :
433 hlen += MIN(sizeof(struct icmp),
434 fin->fin_dlen);
435 break;
436 }
437 }
438 # ifdef USE_INET6
439 else if (p == IPPROTO_ICMPV6) {
440 struct icmp6_hdr *icmp;
441
442 icmp = (struct icmp6_hdr *)fin->fin_dp;
443
444 /*
445 * For ICMPV6, if the packet is an error packet, also
446 * include the information about the packet which
447 * caused the error.
448 */
449 if (icmp->icmp6_type < 128) {
450 hlen += MIN(sizeof(struct icmp6_hdr) + 8,
451 fin->fin_dlen);
452 } else {
453 hlen += MIN(sizeof(struct icmp6_hdr),
454 fin->fin_dlen);
455 }
456 }
457 # endif
458 }
459 /*
460 * Get the interface number and name to which this packet is
461 * currently associated.
462 */
463 # if (SOLARIS || defined(__hpux)) && defined(_KERNEL)
464 # if !defined(FW_HOOKS)
465 ipfl.fl_unit = (u_int)ifp->qf_ppa;
466 # endif
467 COPYIFNAME(fin->fin_v, ifp, ipfl.fl_ifname);
468 # else
469 # if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \
470 OPENBSD_GE_REV(199603) || defined(linux) || FREEBSD_GE_REV(501113)
471 COPYIFNAME(fin->fin_v, ifp, ipfl.fl_ifname);
472 # else
473 ipfl.fl_unit = (u_int)ifp->if_unit;
474 # if defined(_KERNEL)
475 if ((ipfl.fl_ifname[0] = ifp->if_name[0]))
476 if ((ipfl.fl_ifname[1] = ifp->if_name[1]))
477 if ((ipfl.fl_ifname[2] = ifp->if_name[2]))
478 ipfl.fl_ifname[3] = ifp->if_name[3];
479 # else
480 (void) strncpy(ipfl.fl_ifname, IFNAME(ifp), sizeof(ipfl.fl_ifname));
481 ipfl.fl_ifname[sizeof(ipfl.fl_ifname) - 1] = '\0';
482 # endif
483 # endif
484 # endif /* __hpux || SOLARIS */
485 mlen = fin->fin_plen - hlen;
486 if (!softl->ipl_logall) {
487 mlen = (flags & FR_LOGBODY) ? MIN(mlen, 128) : 0;
488 } else if ((flags & FR_LOGBODY) == 0) {
489 mlen = 0;
490 }
491 if (mlen < 0)
492 mlen = 0;
493 ipfl.fl_plen = (u_char)mlen;
494 ipfl.fl_hlen = (u_char)hlen;
495 ipfl.fl_rule = fin->fin_rule;
496 (void) strncpy(ipfl.fl_group, fin->fin_group, FR_GROUPLEN);
497 if (fin->fin_fr != NULL) {
498 ipfl.fl_loglevel = fin->fin_fr->fr_loglevel;
499 ipfl.fl_logtag = fin->fin_fr->fr_logtag;
500 } else {
501 ipfl.fl_loglevel = 0xffff;
502 ipfl.fl_logtag = FR_NOLOGTAG;
503 }
504 if (fin->fin_nattag != NULL)
505 bcopy(fin->fin_nattag, (void *)&ipfl.fl_nattag,
506 sizeof(ipfl.fl_nattag));
507 ipfl.fl_flags = flags;
508 ipfl.fl_breason = (fin->fin_reason & 0xff);
509 ipfl.fl_dir = fin->fin_out;
510 ipfl.fl_lflags = fin->fin_flx;
511 ipfl.fl_family = fin->fin_family;
512 ptrs[0] = (void *)&ipfl;
513 sizes[0] = sizeof(ipfl);
514 types[0] = 0;
515 # if defined(MENTAT) && defined(_KERNEL)
516 /*
517 * Are we copied from the mblk or an aligned array ?
518 */
519 if (fin->fin_ip == (ip_t *)m->b_rptr) {
520 ptrs[1] = m;
521 sizes[1] = hlen + mlen;
522 types[1] = 1;
523 } else {
524 ptrs[1] = fin->fin_ip;
525 sizes[1] = hlen + mlen;
526 types[1] = 0;
527 }
528 # else
529 ptrs[1] = m;
530 sizes[1] = hlen + mlen;
531 types[1] = 1;
532 # endif /* MENTAT */
533 return ipf_log_items(softc, IPL_LOGIPF, fin, ptrs, sizes, types, 2);
534 }
535
536
537 /* ------------------------------------------------------------------------ */
538 /* Function: ipf_log_items */
539 /* Returns: int - 0 == success, -1 == failure */
540 /* Parameters: softc(I) - pointer to main soft context */
541 /* unit(I) - device we are reading from */
542 /* fin(I) - pointer to packet information */
543 /* items(I) - array of pointers to log data */
544 /* itemsz(I) - array of size of valid memory pointed to */
545 /* types(I) - type of data pointed to by items pointers */
546 /* cnt(I) - number of elements in arrays items/itemsz/types */
547 /* */
548 /* Takes an array of parameters and constructs one record to include the */
549 /* miscellaneous packet information, as well as packet data, for reading */
550 /* from the log device. */
551 /* ------------------------------------------------------------------------ */
552 int
ipf_log_items(softc,unit,fin,items,itemsz,types,cnt)553 ipf_log_items(softc, unit, fin, items, itemsz, types, cnt)
554 ipf_main_softc_t *softc;
555 int unit;
556 fr_info_t *fin;
557 void **items;
558 size_t *itemsz;
559 int *types, cnt;
560 {
561 ipf_log_softc_t *softl = softc->ipf_log_soft;
562 caddr_t buf, ptr;
563 iplog_t *ipl;
564 size_t len;
565 int i;
566 SPL_INT(s);
567
568 /*
569 * Get the total amount of data to be logged.
570 */
571 for (i = 0, len = sizeof(iplog_t); i < cnt; i++)
572 len += itemsz[i];
573
574 SPL_NET(s);
575 MUTEX_ENTER(&softl->ipl_mutex[unit]);
576 softl->ipl_counter[unit]++;
577 /*
578 * check that we have space to record this information and can
579 * allocate that much.
580 */
581 if ((softl->ipl_used[unit] + len) > softl->ipl_logsize) {
582 softl->ipl_logfail[unit]++;
583 MUTEX_EXIT(&softl->ipl_mutex[unit]);
584 return -1;
585 }
586
587 KMALLOCS(buf, caddr_t, len);
588 if (buf == NULL) {
589 softl->ipl_logfail[unit]++;
590 MUTEX_EXIT(&softl->ipl_mutex[unit]);
591 return -1;
592 }
593 ipl = (iplog_t *)buf;
594 ipl->ipl_magic = softl->ipl_magic[unit];
595 ipl->ipl_count = 1;
596 ipl->ipl_seqnum = softl->ipl_counter[unit];
597 ipl->ipl_next = NULL;
598 ipl->ipl_dsize = len;
599 #ifdef _KERNEL
600 GETKTIME(&ipl->ipl_sec);
601 #else
602 ipl->ipl_sec = 0;
603 ipl->ipl_usec = 0;
604 #endif
605
606 /*
607 * Loop through all the items to be logged, copying each one to the
608 * buffer. Use bcopy for normal data or the mb_t copyout routine.
609 */
610 for (i = 0, ptr = buf + sizeof(*ipl); i < cnt; i++) {
611 if (types[i] == 0) {
612 bcopy(items[i], ptr, itemsz[i]);
613 } else if (types[i] == 1) {
614 COPYDATA(items[i], 0, itemsz[i], ptr);
615 }
616 ptr += itemsz[i];
617 }
618 /*
619 * Check to see if this log record has a CRC which matches the last
620 * record logged. If it does, just up the count on the previous one
621 * rather than create a new one.
622 */
623 if (softl->ipl_suppress) {
624 if ((fin != NULL) && (fin->fin_off == 0)) {
625 if ((softl->ipll[unit] != NULL) &&
626 (fin->fin_crc == softl->ipl_crc[unit].fin_crc) &&
627 bcmp((char *)fin, (char *)&softl->ipl_crc[unit],
628 FI_LCSIZE) == 0) {
629 softl->ipll[unit]->ipl_count++;
630 MUTEX_EXIT(&softl->ipl_mutex[unit]);
631 SPL_X(s);
632 KFREES(buf, len);
633 return 0;
634 }
635 bcopy((char *)fin, (char *)&softl->ipl_crc[unit],
636 FI_LCSIZE);
637 softl->ipl_crc[unit].fin_crc = fin->fin_crc;
638 } else
639 bzero((char *)&softl->ipl_crc[unit], FI_CSIZE);
640 }
641
642 /*
643 * advance the log pointer to the next empty record and deduct the
644 * amount of space we're going to use.
645 */
646 softl->ipl_logok[unit]++;
647 softl->ipll[unit] = ipl;
648 *softl->iplh[unit] = ipl;
649 softl->iplh[unit] = &ipl->ipl_next;
650 softl->ipl_used[unit] += len;
651
652 /*
653 * Now that the log record has been completed and added to the queue,
654 * wake up any listeners who may want to read it.
655 */
656 # if SOLARIS && defined(_KERNEL)
657 cv_signal(&softl->ipl_wait[unit]);
658 MUTEX_EXIT(&softl->ipl_mutex[unit]);
659 pollwakeup(&softc->ipf_poll_head[unit], POLLRDNORM);
660 # else
661 MUTEX_EXIT(&softl->ipl_mutex[unit]);
662 WAKEUP(softl->iplh, unit);
663 POLLWAKEUP(unit);
664 # endif
665 SPL_X(s);
666 # ifdef IPL_SELECT
667 iplog_input_ready(unit);
668 # endif
669 return 0;
670 }
671
672
673 /* ------------------------------------------------------------------------ */
674 /* Function: ipf_log_read */
675 /* Returns: int - 0 == success, else error value. */
676 /* Parameters: softc(I) - pointer to main soft context */
677 /* unit(I) - device we are reading from */
678 /* uio(O) - pointer to information about where to store data */
679 /* */
680 /* Called to handle a read on an IPFilter device. Returns only complete */
681 /* log messages - will not partially copy a log record out to userland. */
682 /* */
683 /* NOTE: This function will block and wait for a signal to return data if */
684 /* there is none present. Asynchronous I/O is not implemented. */
685 /* ------------------------------------------------------------------------ */
686 int
ipf_log_read(softc,unit,uio)687 ipf_log_read(softc, unit, uio)
688 ipf_main_softc_t *softc;
689 minor_t unit;
690 struct uio *uio;
691 {
692 ipf_log_softc_t *softl = softc->ipf_log_soft;
693 size_t dlen, copied;
694 int error = 0;
695 iplog_t *ipl;
696 SPL_INT(s);
697
698 if (softl->ipl_log_init == 0) {
699 IPFERROR(40007);
700 return 0;
701 }
702
703 /*
704 * Sanity checks. Make sure the minor # is valid and we're copying
705 * a valid chunk of data.
706 */
707 if (IPL_LOGMAX < unit) {
708 IPFERROR(40001);
709 return ENXIO;
710 }
711 if (uio->uio_resid == 0)
712 return 0;
713
714 if (uio->uio_resid < sizeof(iplog_t)) {
715 IPFERROR(40002);
716 return EINVAL;
717 }
718 if (uio->uio_resid > softl->ipl_logsize) {
719 IPFERROR(40005);
720 return EINVAL;
721 }
722
723 /*
724 * Lock the log so we can snapshot the variables. Wait for a signal
725 * if the log is empty.
726 */
727 SPL_NET(s);
728 MUTEX_ENTER(&softl->ipl_mutex[unit]);
729 softl->ipl_readers[unit]++;
730
731 while (softl->ipl_log_init == 1 && softl->iplt[unit] == NULL) {
732 # if SOLARIS && defined(_KERNEL)
733 if (!cv_wait_sig(&softl->ipl_wait[unit],
734 &softl->ipl_mutex[unit].ipf_lk)) {
735 softl->ipl_readers[unit]--;
736 MUTEX_EXIT(&softl->ipl_mutex[unit]);
737 IPFERROR(40003);
738 return EINTR;
739 }
740 # else
741 # if defined(__hpux) && defined(_KERNEL)
742 lock_t *l;
743
744 # ifdef IPL_SELECT
745 if (uio->uio_fpflags & (FNBLOCK|FNDELAY)) {
746 /* this is no blocking system call */
747 softl->ipl_readers[unit]--;
748 MUTEX_EXIT(&softl->ipl_mutex[unit]);
749 return 0;
750 }
751 # endif
752
753 MUTEX_EXIT(&softl->ipl_mutex[unit]);
754 l = get_sleep_lock(&softl->iplh[unit]);
755 error = sleep(&softl->iplh[unit], PZERO+1);
756 spinunlock(l);
757 # else
758 # if defined(__osf__) && defined(_KERNEL)
759 error = mpsleep(&softl->iplh[unit], PSUSP|PCATCH, "ipfread", 0,
760 &softl->ipl_mutex, MS_LOCK_SIMPLE);
761 # else
762 MUTEX_EXIT(&softl->ipl_mutex[unit]);
763 SPL_X(s);
764 error = SLEEP(unit + softl->iplh, "ipl sleep");
765 # endif /* __osf__ */
766 # endif /* __hpux */
767 SPL_NET(s);
768 MUTEX_ENTER(&softl->ipl_mutex[unit]);
769 if (error) {
770 softl->ipl_readers[unit]--;
771 MUTEX_EXIT(&softl->ipl_mutex[unit]);
772 IPFERROR(40004);
773 return error;
774 }
775 # endif /* SOLARIS */
776 }
777 if (softl->ipl_log_init != 1) {
778 softl->ipl_readers[unit]--;
779 MUTEX_EXIT(&softl->ipl_mutex[unit]);
780 IPFERROR(40008);
781 return EIO;
782 }
783
784 # if (defined(BSD) && (BSD >= 199101)) || defined(__FreeBSD__) || \
785 defined(__osf__)
786 uio->uio_rw = UIO_READ;
787 # endif
788
789 for (copied = 0; (ipl = softl->iplt[unit]) != NULL; copied += dlen) {
790 dlen = ipl->ipl_dsize;
791 if (dlen > uio->uio_resid)
792 break;
793 /*
794 * Don't hold the mutex over the uiomove call.
795 */
796 softl->iplt[unit] = ipl->ipl_next;
797 softl->ipl_used[unit] -= dlen;
798 MUTEX_EXIT(&softl->ipl_mutex[unit]);
799 SPL_X(s);
800 error = UIOMOVE(ipl, dlen, UIO_READ, uio);
801 if (error) {
802 SPL_NET(s);
803 MUTEX_ENTER(&softl->ipl_mutex[unit]);
804 IPFERROR(40006);
805 ipl->ipl_next = softl->iplt[unit];
806 softl->iplt[unit] = ipl;
807 softl->ipl_used[unit] += dlen;
808 break;
809 }
810 MUTEX_ENTER(&softl->ipl_mutex[unit]);
811 KFREES((caddr_t)ipl, dlen);
812 SPL_NET(s);
813 }
814 if (!softl->iplt[unit]) {
815 softl->ipl_used[unit] = 0;
816 softl->iplh[unit] = &softl->iplt[unit];
817 softl->ipll[unit] = NULL;
818 }
819
820 softl->ipl_readers[unit]--;
821 MUTEX_EXIT(&softl->ipl_mutex[unit]);
822 SPL_X(s);
823 return error;
824 }
825
826
827 /* ------------------------------------------------------------------------ */
828 /* Function: ipf_log_clear */
829 /* Returns: int - number of log bytes cleared. */
830 /* Parameters: softc(I) - pointer to main soft context */
831 /* unit(I) - device we are reading from */
832 /* */
833 /* Deletes all queued up log records for a given output device. */
834 /* ------------------------------------------------------------------------ */
835 int
ipf_log_clear(softc,unit)836 ipf_log_clear(softc, unit)
837 ipf_main_softc_t *softc;
838 minor_t unit;
839 {
840 ipf_log_softc_t *softl = softc->ipf_log_soft;
841 iplog_t *ipl;
842 int used;
843 SPL_INT(s);
844
845 SPL_NET(s);
846 MUTEX_ENTER(&softl->ipl_mutex[unit]);
847 while ((ipl = softl->iplt[unit]) != NULL) {
848 softl->iplt[unit] = ipl->ipl_next;
849 KFREES((caddr_t)ipl, ipl->ipl_dsize);
850 }
851 softl->iplh[unit] = &softl->iplt[unit];
852 softl->ipll[unit] = NULL;
853 used = softl->ipl_used[unit];
854 softl->ipl_used[unit] = 0;
855 bzero((char *)&softl->ipl_crc[unit], FI_CSIZE);
856 MUTEX_EXIT(&softl->ipl_mutex[unit]);
857 SPL_X(s);
858 return used;
859 }
860
861
862 /* ------------------------------------------------------------------------ */
863 /* Function: ipf_log_canread */
864 /* Returns: int - 0 == no data to read, 1 = data present */
865 /* Parameters: softc(I) - pointer to main soft context */
866 /* unit(I) - device we are reading from */
867 /* */
868 /* Returns an indication of whether or not there is data present in the */
869 /* current buffer for the selected ipf device. */
870 /* ------------------------------------------------------------------------ */
871 int
ipf_log_canread(softc,unit)872 ipf_log_canread(softc, unit)
873 ipf_main_softc_t *softc;
874 int unit;
875 {
876 ipf_log_softc_t *softl = softc->ipf_log_soft;
877
878 return softl->iplt[unit] != NULL;
879 }
880
881
882 /* ------------------------------------------------------------------------ */
883 /* Function: ipf_log_canread */
884 /* Returns: int - 0 == no data to read, 1 = data present */
885 /* Parameters: softc(I) - pointer to main soft context */
886 /* unit(I) - device we are reading from */
887 /* */
888 /* Returns how many bytes are currently held in log buffers for the */
889 /* selected ipf device. */
890 /* ------------------------------------------------------------------------ */
891 int
ipf_log_bytesused(softc,unit)892 ipf_log_bytesused(softc, unit)
893 ipf_main_softc_t *softc;
894 int unit;
895 {
896 ipf_log_softc_t *softl = softc->ipf_log_soft;
897
898 if (softl == NULL)
899 return 0;
900
901 return softl->ipl_used[unit];
902 }
903
904
905 /* ------------------------------------------------------------------------ */
906 /* Function: ipf_log_failures */
907 /* Returns: U_QUAD_T - number of log failures */
908 /* Parameters: softc(I) - pointer to main soft context */
909 /* unit(I) - device we are reading from */
910 /* */
911 /* Returns how many times we've tried to log a packet but failed to do so */
912 /* for the selected ipf device. */
913 /* ------------------------------------------------------------------------ */
914 u_long
ipf_log_failures(softc,unit)915 ipf_log_failures(softc, unit)
916 ipf_main_softc_t *softc;
917 int unit;
918 {
919 ipf_log_softc_t *softl = softc->ipf_log_soft;
920
921 if (softl == NULL)
922 return 0;
923
924 return softl->ipl_logfail[unit];
925 }
926
927
928 /* ------------------------------------------------------------------------ */
929 /* Function: ipf_log_logok */
930 /* Returns: U_QUAD_T - number of packets logged */
931 /* Parameters: softc(I) - pointer to main soft context */
932 /* unit(I) - device we are reading from */
933 /* */
934 /* Returns how many times we've successfully logged a packet for the */
935 /* selected ipf device. */
936 /* ------------------------------------------------------------------------ */
937 u_long
ipf_log_logok(softc,unit)938 ipf_log_logok(softc, unit)
939 ipf_main_softc_t *softc;
940 int unit;
941 {
942 ipf_log_softc_t *softl = softc->ipf_log_soft;
943
944 if (softl == NULL)
945 return 0;
946
947 return softl->ipl_logok[unit];
948 }
949 #endif /* IPFILTER_LOG */
950