1 /* $NetBSD: ip_log.c,v 1.6 2013/03/28 20:14:18 christos Exp $ */
2
3 /*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 * Id: ip_log.c,v 1.1.1.2 2012/07/22 13:45:19 darrenr Exp
9 */
10
11 #include <sys/cdefs.h>
12 __KERNEL_RCSID(0, "$NetBSD: ip_log.c,v 1.6 2013/03/28 20:14:18 christos Exp $");
13
14 #include <sys/param.h>
15 #if defined(KERNEL) || defined(_KERNEL)
16 # undef KERNEL
17 # undef _KERNEL
18 # define KERNEL 1
19 # define _KERNEL 1
20 #endif
21 #if defined(__FreeBSD__) && !defined(_KERNEL)
22 # include <osreldate.h>
23 #endif
24 #ifndef SOLARIS
25 # if (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
26 # define SOLARIS 1
27 # else
28 # define SOLARIS 0
29 # endif
30 #endif
31 #include <sys/errno.h>
32 #include <sys/types.h>
33 #include <sys/file.h>
34 #ifndef _KERNEL
35 # include <stdio.h>
36 # include <string.h>
37 # include <stdlib.h>
38 # include <ctype.h>
39 # define _KERNEL
40 # define KERNEL
41 # ifdef __OpenBSD__
42 struct file;
43 # endif
44 # include <sys/uio.h>
45 # undef _KERNEL
46 # undef KERNEL
47 #endif
48 #if (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)) && \
49 defined(_KERNEL)
50 # include <sys/fcntl.h>
51 # include <sys/filio.h>
52 #else
53 # include <sys/ioctl.h>
54 #endif
55 #include <sys/time.h>
56 #if defined(_KERNEL)
57 # include <sys/systm.h>
58 # if (defined(NetBSD) && (__NetBSD_Version__ >= 104000000))
59 # include <sys/proc.h>
60 # endif
61 #endif /* _KERNEL */
62 #if !SOLARIS && !defined(__hpux) && !defined(linux)
63 # if (defined(NetBSD) && (NetBSD > 199609)) || \
64 (defined(OpenBSD) && (OpenBSD > 199603)) || \
65 (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
66 # include <sys/dirent.h>
67 # else
68 # include <sys/dir.h>
69 # endif
70 # include <sys/mbuf.h>
71 # include <sys/select.h>
72 # if __FreeBSD_version >= 500000
73 # include <sys/selinfo.h>
74 # endif
75 #else
76 # if !defined(__hpux) && defined(_KERNEL)
77 # include <sys/filio.h>
78 # include <sys/cred.h>
79 # include <sys/ddi.h>
80 # include <sys/sunddi.h>
81 # include <sys/ksynch.h>
82 # include <sys/kmem.h>
83 # include <sys/mkdev.h>
84 # include <sys/dditypes.h>
85 # include <sys/cmn_err.h>
86 # endif /* !__hpux */
87 #endif /* !SOLARIS && !__hpux */
88 #if !defined(linux)
89 # include <sys/protosw.h>
90 #endif
91 #include <sys/socket.h>
92
93 #include <net/if.h>
94 #ifdef sun
95 # include <net/af.h>
96 #endif
97 #if __FreeBSD_version >= 300000
98 # include <net/if_var.h>
99 #endif
100 #include <netinet/in.h>
101 #ifdef __sgi
102 # include <sys/ddi.h>
103 # ifdef IFF_DRVRLOCK /* IRIX6 */
104 # include <sys/hashing.h>
105 # endif
106 #endif
107 #if !defined(__hpux) && !defined(linux) && \
108 !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /*IRIX<6*/
109 # include <netinet/in_var.h>
110 #endif
111 #include <netinet/in_systm.h>
112 #include <netinet/ip.h>
113 #include <netinet/tcp.h>
114 #include <netinet/udp.h>
115 #include <netinet/ip_icmp.h>
116 #ifdef USE_INET6
117 # include <netinet/icmp6.h>
118 #endif
119 #if !defined(linux)
120 # include <netinet/ip_var.h>
121 #endif
122 #ifndef _KERNEL
123 # include <syslog.h>
124 #endif
125 #include "netinet/ip_compat.h"
126 #include <netinet/tcpip.h>
127 #include "netinet/ip_fil.h"
128 #include "netinet/ip_nat.h"
129 #include "netinet/ip_frag.h"
130 #include "netinet/ip_state.h"
131 #include "netinet/ip_auth.h"
132 #if (__FreeBSD_version >= 300000) || defined(__NetBSD__)
133 # include <sys/malloc.h>
134 #endif
135 /* END OF INCLUDES */
136
137 #ifdef IPFILTER_LOG
138
139 # if defined(IPL_SELECT)
140 # include <machine/sys/user.h>
141 # include <sys/kthread_iface.h>
142 # define READ_COLLISION 0x001
143 extern int selwait;
144 # endif /* IPL_SELECT */
145
146 typedef struct ipf_log_softc_s {
147 ipfmutex_t ipl_mutex[IPL_LOGSIZE];
148 # if SOLARIS && defined(_KERNEL)
149 kcondvar_t ipl_wait[IPL_LOGSIZE];
150 # endif
151 # if defined(linux) && defined(_KERNEL)
152 wait_queue_head_t iplh_linux[IPL_LOGSIZE];
153 # endif
154 # if defined(__hpux) && defined(_KERNEL)
155 iplog_select_t ipl_ss[IPL_LOGSIZE];
156 # endif
157 iplog_t **iplh[IPL_LOGSIZE];
158 iplog_t *iplt[IPL_LOGSIZE];
159 iplog_t *ipll[IPL_LOGSIZE];
160 u_long ipl_logfail[IPL_LOGSIZE];
161 u_long ipl_logok[IPL_LOGSIZE];
162 fr_info_t ipl_crc[IPL_LOGSIZE];
163 u_32_t ipl_counter[IPL_LOGSIZE];
164 int ipl_suppress;
165 int ipl_logall;
166 int ipl_log_init;
167 int ipl_logsize;
168 int ipl_used[IPL_LOGSIZE];
169 int ipl_magic[IPL_LOGSIZE];
170 ipftuneable_t *ipf_log_tune;
171 int ipl_readers[IPL_LOGSIZE];
172 } ipf_log_softc_t;
173
174 static int magic[IPL_LOGSIZE] = { IPL_MAGIC, IPL_MAGIC_NAT, IPL_MAGIC_STATE,
175 IPL_MAGIC, IPL_MAGIC, IPL_MAGIC,
176 IPL_MAGIC, IPL_MAGIC };
177
178 static ipftuneable_t ipf_log_tuneables[] = {
179 /* log */
180 { { (void *)offsetof(ipf_log_softc_t, ipl_suppress) },
181 "log_suppress", 0, 1,
182 stsizeof(ipf_log_softc_t, ipl_suppress),
183 0, NULL, NULL },
184 { { (void *)offsetof(ipf_log_softc_t, ipl_logall) },
185 "log_all", 0, 1,
186 stsizeof(ipf_log_softc_t, ipl_logall),
187 0, NULL, NULL },
188 { { (void *)offsetof(ipf_log_softc_t, ipl_logsize) },
189 "log_size", 0, 0x80000,
190 stsizeof(ipf_log_softc_t, ipl_logsize),
191 0, NULL, NULL },
192 { { NULL }, NULL, 0, 0,
193 0,
194 0, NULL, NULL }
195 };
196
197
198 int
ipf_log_main_load(void)199 ipf_log_main_load(void)
200 {
201 return 0;
202 }
203
204
205 int
ipf_log_main_unload(void)206 ipf_log_main_unload(void)
207 {
208 return 0;
209 }
210
211 /* ------------------------------------------------------------------------ */
212 /* Function: ipf_log_soft_create */
213 /* Returns: void * - NULL = failure, else pointer to log context data */
214 /* Parameters: softc(I) - pointer to soft context main structure */
215 /* */
216 /* Initialise log buffers & pointers. Also iniialised the CRC to a local */
217 /* secret for use in calculating the "last log checksum". */
218 /* ------------------------------------------------------------------------ */
219 void *
ipf_log_soft_create(ipf_main_softc_t * softc)220 ipf_log_soft_create(ipf_main_softc_t *softc)
221 {
222 ipf_log_softc_t *softl;
223
224 KMALLOC(softl, ipf_log_softc_t *);
225 if (softl == NULL)
226 return NULL;
227
228 bzero((char *)softl, sizeof(*softl));
229 bcopy((char *)magic, (char *)softl->ipl_magic, sizeof(magic));
230
231 softl->ipf_log_tune = ipf_tune_array_copy(softl,
232 sizeof(ipf_log_tuneables),
233 ipf_log_tuneables);
234 if (softl->ipf_log_tune == NULL) {
235 ipf_log_soft_destroy(softc, softl);
236 return NULL;
237 }
238 if (ipf_tune_array_link(softc, softl->ipf_log_tune) == -1) {
239 ipf_log_soft_destroy(softc, softl);
240 return NULL;
241 }
242
243 softl->ipl_suppress = 1;
244 softl->ipl_logall = 0;
245 softl->ipl_log_init = 0;
246 softl->ipl_logsize = IPFILTER_LOGSIZE;
247
248 return softl;
249 }
250
251 /* ------------------------------------------------------------------------ */
252 /* Function: ipf_log_soft_init */
253 /* Returns: int - 0 == success (always returned) */
254 /* Parameters: softc(I) - pointer to soft context main structure */
255 /* */
256 /* Initialise log buffers & pointers. Also iniialised the CRC to a local */
257 /* secret for use in calculating the "last log checksum". */
258 /* ------------------------------------------------------------------------ */
259 int
ipf_log_soft_init(ipf_main_softc_t * softc,void * arg)260 ipf_log_soft_init(ipf_main_softc_t *softc, void *arg)
261 {
262 ipf_log_softc_t *softl = arg;
263 int i;
264
265 for (i = IPL_LOGMAX; i >= 0; i--) {
266 softl->iplt[i] = NULL;
267 softl->ipll[i] = NULL;
268 softl->iplh[i] = &softl->iplt[i];
269 bzero((char *)&softl->ipl_crc[i], sizeof(softl->ipl_crc[i]));
270 # ifdef IPL_SELECT
271 softl->iplog_ss[i].read_waiter = 0;
272 softl->iplog_ss[i].state = 0;
273 # endif
274 # if defined(linux) && defined(_KERNEL)
275 init_waitqueue_head(softl->iplh_linux + i);
276 # endif
277 # if SOLARIS && defined(_KERNEL)
278 cv_init(&softl->ipl_wait[i], NULL, CV_DRIVER, NULL);
279 # endif
280 MUTEX_INIT(&softl->ipl_mutex[i], "ipf log mutex");
281 }
282
283
284 softl->ipl_log_init = 1;
285
286 return 0;
287 }
288
289
290 /* ------------------------------------------------------------------------ */
291 /* Function: ipf_log_soft_fini */
292 /* Parameters: softc(I) - pointer to soft context main structure */
293 /* arg(I) - pointer to log context structure */
294 /* */
295 /* Clean up any log data that has accumulated without being read. */
296 /* ------------------------------------------------------------------------ */
297 int
ipf_log_soft_fini(ipf_main_softc_t * softc,void * arg)298 ipf_log_soft_fini(ipf_main_softc_t *softc, void *arg)
299 {
300 ipf_log_softc_t *softl = arg;
301 int i;
302
303 if (softl->ipl_log_init == 0)
304 return 0;
305
306 softl->ipl_log_init = 0;
307
308 for (i = IPL_LOGMAX; i >= 0; i--) {
309 (void) ipf_log_clear(softc, i);
310
311 /*
312 * This is a busy-wait loop so as to avoid yet another lock
313 * to wait on.
314 */
315 MUTEX_ENTER(&softl->ipl_mutex[i]);
316 while (softl->ipl_readers[i] > 0) {
317 # if SOLARIS && defined(_KERNEL)
318 cv_broadcast(&softl->ipl_wait[i]);
319 MUTEX_EXIT(&softl->ipl_mutex[i]);
320 delay(100);
321 pollwakeup(&softc->ipf_poll_head[i], POLLRDNORM);
322 # else
323 MUTEX_EXIT(&softl->ipl_mutex[i]);
324 WAKEUP(softl->iplh, i);
325 POLLWAKEUP(i);
326 # endif
327 MUTEX_ENTER(&softl->ipl_mutex[i]);
328 }
329 MUTEX_EXIT(&softl->ipl_mutex[i]);
330 MUTEX_DESTROY(&softl->ipl_mutex[i]);
331 }
332
333 return 0;
334 }
335
336
337 /* ------------------------------------------------------------------------ */
338 /* Function: ipf_log_soft_destroy */
339 /* Parameters: softc(I) - pointer to soft context main structure */
340 /* arg(I) - pointer to log context structure */
341 /* */
342 /* When this function is called, it is expected that there are no longer */
343 /* any threads active in the reading code path or the logging code path. */
344 /* ------------------------------------------------------------------------ */
345 void
ipf_log_soft_destroy(ipf_main_softc_t * softc,void * arg)346 ipf_log_soft_destroy(ipf_main_softc_t *softc, void *arg)
347 {
348 ipf_log_softc_t *softl = arg;
349 int i;
350
351 for (i = IPL_LOGMAX; i >= 0; i--) {
352 # if SOLARIS && defined(_KERNEL)
353 cv_destroy(&softl->ipl_wait[i]);
354 # endif
355 }
356
357 if (softl->ipf_log_tune != NULL) {
358 ipf_tune_array_unlink(softc, softl->ipf_log_tune);
359 KFREES(softl->ipf_log_tune, sizeof(ipf_log_tuneables));
360 softl->ipf_log_tune = NULL;
361 }
362
363 KFREE(softl);
364 }
365
366
367 /* ------------------------------------------------------------------------ */
368 /* Function: ipf_log_pkt */
369 /* Returns: int - 0 == success, -1 == failure */
370 /* Parameters: fin(I) - pointer to packet information */
371 /* flags(I) - flags from filter rules */
372 /* */
373 /* Create a log record for a packet given that it has been triggered by a */
374 /* rule (or the default setting). Calculate the transport protocol header */
375 /* size using predetermined size of a couple of popular protocols and thus */
376 /* how much data to copy into the log, including part of the data body if */
377 /* requested. */
378 /* ------------------------------------------------------------------------ */
379 int
ipf_log_pkt(fr_info_t * fin,u_int flags)380 ipf_log_pkt(fr_info_t *fin, 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(ipf_main_softc_t * softc,int unit,fr_info_t * fin,void ** items,size_t * itemsz,int * types,int cnt)555 ipf_log_items(ipf_main_softc_t *softc, int unit, fr_info_t *fin,
556 void **items, size_t *itemsz, int *types, int cnt)
557 {
558 ipf_log_softc_t *softl = softc->ipf_log_soft;
559 char *buf, *ptr;
560 iplog_t *ipl;
561 size_t len;
562 int i;
563 SPL_INT(s);
564
565 /*
566 * Get the total amount of data to be logged.
567 */
568 for (i = 0, len = sizeof(iplog_t); i < cnt; i++)
569 len += itemsz[i];
570
571 SPL_NET(s);
572 MUTEX_ENTER(&softl->ipl_mutex[unit]);
573 softl->ipl_counter[unit]++;
574 /*
575 * check that we have space to record this information and can
576 * allocate that much.
577 */
578 if ((softl->ipl_used[unit] + len) > softl->ipl_logsize) {
579 softl->ipl_logfail[unit]++;
580 MUTEX_EXIT(&softl->ipl_mutex[unit]);
581 return -1;
582 }
583
584 KMALLOCS(buf, char *, len);
585 if (buf == NULL) {
586 softl->ipl_logfail[unit]++;
587 MUTEX_EXIT(&softl->ipl_mutex[unit]);
588 return -1;
589 }
590 ipl = (iplog_t *)buf;
591 ipl->ipl_magic = softl->ipl_magic[unit];
592 ipl->ipl_count = 1;
593 ipl->ipl_seqnum = softl->ipl_counter[unit];
594 ipl->ipl_next = NULL;
595 ipl->ipl_dsize = len;
596 #ifdef _KERNEL
597 GETKTIME(&ipl->ipl_sec);
598 #else
599 ipl->ipl_sec = 0;
600 ipl->ipl_usec = 0;
601 #endif
602
603 /*
604 * Loop through all the items to be logged, copying each one to the
605 * buffer. Use bcopy for normal data or the mb_t copyout routine.
606 */
607 for (i = 0, ptr = buf + sizeof(*ipl); i < cnt; i++) {
608 if (types[i] == 0) {
609 memcpy(ptr, items[i], itemsz[i]);
610 } else if (types[i] == 1) {
611 COPYDATA(items[i], 0, itemsz[i], ptr);
612 }
613 ptr += itemsz[i];
614 }
615 /*
616 * Check to see if this log record has a CRC which matches the last
617 * record logged. If it does, just up the count on the previous one
618 * rather than create a new one.
619 */
620 if (softl->ipl_suppress) {
621 if ((fin != NULL) && (fin->fin_off == 0)) {
622 if ((softl->ipll[unit] != NULL) &&
623 (fin->fin_crc == softl->ipl_crc[unit].fin_crc) &&
624 bcmp((char *)fin, (char *)&softl->ipl_crc[unit],
625 FI_LCSIZE) == 0) {
626 softl->ipll[unit]->ipl_count++;
627 MUTEX_EXIT(&softl->ipl_mutex[unit]);
628 SPL_X(s);
629 KFREES(buf, len);
630 return 0;
631 }
632 bcopy((char *)fin, (char *)&softl->ipl_crc[unit],
633 FI_LCSIZE);
634 softl->ipl_crc[unit].fin_crc = fin->fin_crc;
635 } else
636 bzero((char *)&softl->ipl_crc[unit], FI_CSIZE);
637 }
638
639 /*
640 * advance the log pointer to the next empty record and deduct the
641 * amount of space we're going to use.
642 */
643 softl->ipl_logok[unit]++;
644 softl->ipll[unit] = ipl;
645 *softl->iplh[unit] = ipl;
646 softl->iplh[unit] = &ipl->ipl_next;
647 softl->ipl_used[unit] += len;
648
649 /*
650 * Now that the log record has been completed and added to the queue,
651 * wake up any listeners who may want to read it.
652 */
653 # if SOLARIS && defined(_KERNEL)
654 cv_signal(&softl->ipl_wait[unit]);
655 MUTEX_EXIT(&softl->ipl_mutex[unit]);
656 pollwakeup(&softc->ipf_poll_head[unit], POLLRDNORM);
657 # else
658 MUTEX_EXIT(&softl->ipl_mutex[unit]);
659 WAKEUP(softl->iplh, unit);
660 POLLWAKEUP(unit);
661 # endif
662 SPL_X(s);
663 # ifdef IPL_SELECT
664 iplog_input_ready(unit);
665 # endif
666 return 0;
667 }
668
669
670 /* ------------------------------------------------------------------------ */
671 /* Function: ipf_log_read */
672 /* Returns: int - 0 == success, else error value. */
673 /* Parameters: softc(I) - pointer to main soft context */
674 /* unit(I) - device we are reading from */
675 /* uio(O) - pointer to information about where to store data */
676 /* */
677 /* Called to handle a read on an IPFilter device. Returns only complete */
678 /* log messages - will not partially copy a log record out to userland. */
679 /* */
680 /* NOTE: This function will block and wait for a signal to return data if */
681 /* there is none present. Asynchronous I/O is not implemented. */
682 /* ------------------------------------------------------------------------ */
683 int
ipf_log_read(ipf_main_softc_t * softc,minor_t unit,struct uio * uio)684 ipf_log_read(ipf_main_softc_t *softc, minor_t unit, struct uio *uio)
685 {
686 ipf_log_softc_t *softl = softc->ipf_log_soft;
687 size_t dlen, copied;
688 int error = 0;
689 iplog_t *ipl;
690 SPL_INT(s);
691
692 if (softl->ipl_log_init == 0) {
693 IPFERROR(40007);
694 return 0;
695 }
696
697 /*
698 * Sanity checks. Make sure the minor # is valid and we're copying
699 * a valid chunk of data.
700 */
701 if (IPL_LOGMAX < unit) {
702 IPFERROR(40001);
703 return ENXIO;
704 }
705 if (uio->uio_resid == 0)
706 return 0;
707
708 if (uio->uio_resid < sizeof(iplog_t)) {
709 IPFERROR(40002);
710 return EINVAL;
711 }
712 if (uio->uio_resid > softl->ipl_logsize) {
713 IPFERROR(40005);
714 return EINVAL;
715 }
716
717 /*
718 * Lock the log so we can snapshot the variables. Wait for a signal
719 * if the log is empty.
720 */
721 SPL_NET(s);
722 MUTEX_ENTER(&softl->ipl_mutex[unit]);
723 softl->ipl_readers[unit]++;
724
725 while (softl->ipl_log_init == 1 && softl->iplt[unit] == NULL) {
726 # if SOLARIS && defined(_KERNEL)
727 if (!cv_wait_sig(&softl->ipl_wait[unit],
728 &softl->ipl_mutex[unit].ipf_lk)) {
729 softl->ipl_readers[unit]--;
730 MUTEX_EXIT(&softl->ipl_mutex[unit]);
731 IPFERROR(40003);
732 return EINTR;
733 }
734 # else
735 # if defined(__hpux) && defined(_KERNEL)
736 lock_t *l;
737
738 # ifdef IPL_SELECT
739 if (uio->uio_fpflags & (FNBLOCK|FNDELAY)) {
740 /* this is no blocking system call */
741 softl->ipl_readers[unit]--;
742 MUTEX_EXIT(&softl->ipl_mutex[unit]);
743 return 0;
744 }
745 # endif
746
747 MUTEX_EXIT(&softl->ipl_mutex[unit]);
748 l = get_sleep_lock(&softl->iplh[unit]);
749 error = sleep(&softl->iplh[unit], PZERO+1);
750 spinunlock(l);
751 # else
752 # if defined(__osf__) && defined(_KERNEL)
753 error = mpsleep(&softl->iplh[unit], PSUSP|PCATCH, "ipfread", 0,
754 &softl->ipl_mutex, MS_LOCK_SIMPLE);
755 # else
756 MUTEX_EXIT(&softl->ipl_mutex[unit]);
757 SPL_X(s);
758 error = SLEEP(unit + softl->iplh, "ipl sleep");
759 # endif /* __osf__ */
760 # endif /* __hpux */
761 SPL_NET(s);
762 MUTEX_ENTER(&softl->ipl_mutex[unit]);
763 if (error) {
764 softl->ipl_readers[unit]--;
765 MUTEX_EXIT(&softl->ipl_mutex[unit]);
766 IPFERROR(40004);
767 return error;
768 }
769 # endif /* SOLARIS */
770 }
771 if (softl->ipl_log_init != 1) {
772 softl->ipl_readers[unit]--;
773 MUTEX_EXIT(&softl->ipl_mutex[unit]);
774 IPFERROR(40008);
775 return EIO;
776 }
777
778 # if (defined(BSD) && (BSD >= 199101)) || defined(__FreeBSD__) || \
779 defined(__osf__)
780 uio->uio_rw = UIO_READ;
781 # endif
782
783 for (copied = 0; (ipl = softl->iplt[unit]) != NULL; copied += dlen) {
784 dlen = ipl->ipl_dsize;
785 if (dlen > uio->uio_resid)
786 break;
787 /*
788 * Don't hold the mutex over the uiomove call.
789 */
790 softl->iplt[unit] = ipl->ipl_next;
791 softl->ipl_used[unit] -= dlen;
792 MUTEX_EXIT(&softl->ipl_mutex[unit]);
793 SPL_X(s);
794 error = UIOMOVE((void *)ipl, dlen, UIO_READ, uio);
795 if (error) {
796 SPL_NET(s);
797 MUTEX_ENTER(&softl->ipl_mutex[unit]);
798 IPFERROR(40006);
799 ipl->ipl_next = softl->iplt[unit];
800 softl->iplt[unit] = ipl;
801 softl->ipl_used[unit] += dlen;
802 break;
803 }
804 MUTEX_ENTER(&softl->ipl_mutex[unit]);
805 KFREES((void *)ipl, dlen);
806 SPL_NET(s);
807 }
808 if (!softl->iplt[unit]) {
809 softl->ipl_used[unit] = 0;
810 softl->iplh[unit] = &softl->iplt[unit];
811 softl->ipll[unit] = NULL;
812 }
813
814 softl->ipl_readers[unit]--;
815 MUTEX_EXIT(&softl->ipl_mutex[unit]);
816 SPL_X(s);
817 return error;
818 }
819
820
821 /* ------------------------------------------------------------------------ */
822 /* Function: ipf_log_clear */
823 /* Returns: int - number of log bytes cleared. */
824 /* Parameters: softc(I) - pointer to main soft context */
825 /* unit(I) - device we are reading from */
826 /* */
827 /* Deletes all queued up log records for a given output device. */
828 /* ------------------------------------------------------------------------ */
829 int
ipf_log_clear(ipf_main_softc_t * softc,minor_t unit)830 ipf_log_clear(ipf_main_softc_t *softc, minor_t unit)
831 {
832 ipf_log_softc_t *softl = softc->ipf_log_soft;
833 iplog_t *ipl;
834 int used;
835 SPL_INT(s);
836
837 SPL_NET(s);
838 MUTEX_ENTER(&softl->ipl_mutex[unit]);
839 while ((ipl = softl->iplt[unit]) != NULL) {
840 softl->iplt[unit] = ipl->ipl_next;
841 KFREES((void *)ipl, ipl->ipl_dsize);
842 }
843 softl->iplh[unit] = &softl->iplt[unit];
844 softl->ipll[unit] = NULL;
845 used = softl->ipl_used[unit];
846 softl->ipl_used[unit] = 0;
847 bzero((char *)&softl->ipl_crc[unit], FI_CSIZE);
848 MUTEX_EXIT(&softl->ipl_mutex[unit]);
849 SPL_X(s);
850 return used;
851 }
852
853
854 /* ------------------------------------------------------------------------ */
855 /* Function: ipf_log_canread */
856 /* Returns: int - 0 == no data to read, 1 = data present */
857 /* Parameters: softc(I) - pointer to main soft context */
858 /* unit(I) - device we are reading from */
859 /* */
860 /* Returns an indication of whether or not there is data present in the */
861 /* current buffer for the selected ipf device. */
862 /* ------------------------------------------------------------------------ */
863 int
ipf_log_canread(ipf_main_softc_t * softc,int unit)864 ipf_log_canread(ipf_main_softc_t *softc, int unit)
865 {
866 ipf_log_softc_t *softl = softc->ipf_log_soft;
867
868 return softl->iplt[unit] != NULL;
869 }
870
871
872 /* ------------------------------------------------------------------------ */
873 /* Function: ipf_log_canread */
874 /* Returns: int - 0 == no data to read, 1 = data present */
875 /* Parameters: softc(I) - pointer to main soft context */
876 /* unit(I) - device we are reading from */
877 /* */
878 /* Returns how many bytes are currently held in log buffers for the */
879 /* selected ipf device. */
880 /* ------------------------------------------------------------------------ */
881 int
ipf_log_bytesused(ipf_main_softc_t * softc,int unit)882 ipf_log_bytesused(ipf_main_softc_t *softc, int unit)
883 {
884 ipf_log_softc_t *softl = softc->ipf_log_soft;
885
886 if (softl == NULL)
887 return 0;
888
889 return softl->ipl_used[unit];
890 }
891
892
893 /* ------------------------------------------------------------------------ */
894 /* Function: ipf_log_failures */
895 /* Returns: U_QUAD_T - number of log failures */
896 /* Parameters: softc(I) - pointer to main soft context */
897 /* unit(I) - device we are reading from */
898 /* */
899 /* Returns how many times we've tried to log a packet but failed to do so */
900 /* for the selected ipf device. */
901 /* ------------------------------------------------------------------------ */
902 u_long
ipf_log_failures(ipf_main_softc_t * softc,int unit)903 ipf_log_failures(ipf_main_softc_t *softc, int unit)
904 {
905 ipf_log_softc_t *softl = softc->ipf_log_soft;
906
907 if (softl == NULL)
908 return 0;
909
910 return softl->ipl_logfail[unit];
911 }
912
913
914 /* ------------------------------------------------------------------------ */
915 /* Function: ipf_log_logok */
916 /* Returns: U_QUAD_T - number of packets logged */
917 /* Parameters: softc(I) - pointer to main soft context */
918 /* unit(I) - device we are reading from */
919 /* */
920 /* Returns how many times we've successfully logged a packet for the */
921 /* selected ipf device. */
922 /* ------------------------------------------------------------------------ */
923 u_long
ipf_log_logok(ipf_main_softc_t * softc,int unit)924 ipf_log_logok(ipf_main_softc_t *softc, int unit)
925 {
926 ipf_log_softc_t *softl = softc->ipf_log_soft;
927
928 if (softl == NULL)
929 return 0;
930
931 return softl->ipl_logok[unit];
932 }
933 #endif /* IPFILTER_LOG */
934