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32#include <linux/types.h>
33#include <linux/rculist.h>
34#include <linux/skbuff.h>
35#include <linux/spinlock.h>
36#include <linux/string.h>
37#include <linux/audit.h>
38#include <linux/slab.h>
39#include <net/netlabel.h>
40#include <net/cipso_ipv4.h>
41#include <asm/bug.h>
42
43#include "netlabel_mgmt.h"
44#include "netlabel_addrlist.h"
45#include "netlabel_domainhash.h"
46#include "netlabel_user.h"
47
48struct netlbl_domhsh_tbl {
49 struct list_head *tbl;
50 u32 size;
51};
52
53
54
55
56static DEFINE_SPINLOCK(netlbl_domhsh_lock);
57#define netlbl_domhsh_rcu_deref(p) \
58 rcu_dereference_check(p, lockdep_is_held(&netlbl_domhsh_lock))
59static struct netlbl_domhsh_tbl *netlbl_domhsh = NULL;
60static struct netlbl_dom_map *netlbl_domhsh_def = NULL;
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76static void netlbl_domhsh_free_entry(struct rcu_head *entry)
77{
78 struct netlbl_dom_map *ptr;
79 struct netlbl_af4list *iter4;
80 struct netlbl_af4list *tmp4;
81#if IS_ENABLED(CONFIG_IPV6)
82 struct netlbl_af6list *iter6;
83 struct netlbl_af6list *tmp6;
84#endif
85
86 ptr = container_of(entry, struct netlbl_dom_map, rcu);
87 if (ptr->def.type == NETLBL_NLTYPE_ADDRSELECT) {
88 netlbl_af4list_foreach_safe(iter4, tmp4,
89 &ptr->def.addrsel->list4) {
90 netlbl_af4list_remove_entry(iter4);
91 kfree(netlbl_domhsh_addr4_entry(iter4));
92 }
93#if IS_ENABLED(CONFIG_IPV6)
94 netlbl_af6list_foreach_safe(iter6, tmp6,
95 &ptr->def.addrsel->list6) {
96 netlbl_af6list_remove_entry(iter6);
97 kfree(netlbl_domhsh_addr6_entry(iter6));
98 }
99#endif
100 }
101 kfree(ptr->domain);
102 kfree(ptr);
103}
104
105
106
107
108
109
110
111
112
113
114
115
116static u32 netlbl_domhsh_hash(const char *key)
117{
118 u32 iter;
119 u32 val;
120 u32 len;
121
122
123
124
125 for (iter = 0, val = 0, len = strlen(key); iter < len; iter++)
126 val = (val << 4 | (val >> (8 * sizeof(u32) - 4))) ^ key[iter];
127 return val & (netlbl_domhsh_rcu_deref(netlbl_domhsh)->size - 1);
128}
129
130
131
132
133
134
135
136
137
138
139
140
141static struct netlbl_dom_map *netlbl_domhsh_search(const char *domain)
142{
143 u32 bkt;
144 struct list_head *bkt_list;
145 struct netlbl_dom_map *iter;
146
147 if (domain != NULL) {
148 bkt = netlbl_domhsh_hash(domain);
149 bkt_list = &netlbl_domhsh_rcu_deref(netlbl_domhsh)->tbl[bkt];
150 list_for_each_entry_rcu(iter, bkt_list, list)
151 if (iter->valid && strcmp(iter->domain, domain) == 0)
152 return iter;
153 }
154
155 return NULL;
156}
157
158
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162
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165
166
167
168
169
170
171static struct netlbl_dom_map *netlbl_domhsh_search_def(const char *domain)
172{
173 struct netlbl_dom_map *entry;
174
175 entry = netlbl_domhsh_search(domain);
176 if (entry == NULL) {
177 entry = netlbl_domhsh_rcu_deref(netlbl_domhsh_def);
178 if (entry != NULL && !entry->valid)
179 entry = NULL;
180 }
181
182 return entry;
183}
184
185
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196
197
198
199static void netlbl_domhsh_audit_add(struct netlbl_dom_map *entry,
200 struct netlbl_af4list *addr4,
201 struct netlbl_af6list *addr6,
202 int result,
203 struct netlbl_audit *audit_info)
204{
205 struct audit_buffer *audit_buf;
206 struct cipso_v4_doi *cipsov4 = NULL;
207 u32 type;
208
209 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_ADD, audit_info);
210 if (audit_buf != NULL) {
211 audit_log_format(audit_buf, " nlbl_domain=%s",
212 entry->domain ? entry->domain : "(default)");
213 if (addr4 != NULL) {
214 struct netlbl_domaddr4_map *map4;
215 map4 = netlbl_domhsh_addr4_entry(addr4);
216 type = map4->def.type;
217 cipsov4 = map4->def.cipso;
218 netlbl_af4list_audit_addr(audit_buf, 0, NULL,
219 addr4->addr, addr4->mask);
220#if IS_ENABLED(CONFIG_IPV6)
221 } else if (addr6 != NULL) {
222 struct netlbl_domaddr6_map *map6;
223 map6 = netlbl_domhsh_addr6_entry(addr6);
224 type = map6->def.type;
225 netlbl_af6list_audit_addr(audit_buf, 0, NULL,
226 &addr6->addr, &addr6->mask);
227#endif
228 } else {
229 type = entry->def.type;
230 cipsov4 = entry->def.cipso;
231 }
232 switch (type) {
233 case NETLBL_NLTYPE_UNLABELED:
234 audit_log_format(audit_buf, " nlbl_protocol=unlbl");
235 break;
236 case NETLBL_NLTYPE_CIPSOV4:
237 BUG_ON(cipsov4 == NULL);
238 audit_log_format(audit_buf,
239 " nlbl_protocol=cipsov4 cipso_doi=%u",
240 cipsov4->doi);
241 break;
242 }
243 audit_log_format(audit_buf, " res=%u", result == 0 ? 1 : 0);
244 audit_log_end(audit_buf);
245 }
246}
247
248
249
250
251
252
253
254
255
256static int netlbl_domhsh_validate(const struct netlbl_dom_map *entry)
257{
258 struct netlbl_af4list *iter4;
259 struct netlbl_domaddr4_map *map4;
260#if IS_ENABLED(CONFIG_IPV6)
261 struct netlbl_af6list *iter6;
262 struct netlbl_domaddr6_map *map6;
263#endif
264
265 if (entry == NULL)
266 return -EINVAL;
267
268 switch (entry->def.type) {
269 case NETLBL_NLTYPE_UNLABELED:
270 if (entry->def.cipso != NULL || entry->def.addrsel != NULL)
271 return -EINVAL;
272 break;
273 case NETLBL_NLTYPE_CIPSOV4:
274 if (entry->def.cipso == NULL)
275 return -EINVAL;
276 break;
277 case NETLBL_NLTYPE_ADDRSELECT:
278 netlbl_af4list_foreach(iter4, &entry->def.addrsel->list4) {
279 map4 = netlbl_domhsh_addr4_entry(iter4);
280 switch (map4->def.type) {
281 case NETLBL_NLTYPE_UNLABELED:
282 if (map4->def.cipso != NULL)
283 return -EINVAL;
284 break;
285 case NETLBL_NLTYPE_CIPSOV4:
286 if (map4->def.cipso == NULL)
287 return -EINVAL;
288 break;
289 default:
290 return -EINVAL;
291 }
292 }
293#if IS_ENABLED(CONFIG_IPV6)
294 netlbl_af6list_foreach(iter6, &entry->def.addrsel->list6) {
295 map6 = netlbl_domhsh_addr6_entry(iter6);
296 switch (map6->def.type) {
297 case NETLBL_NLTYPE_UNLABELED:
298 break;
299 default:
300 return -EINVAL;
301 }
302 }
303#endif
304 break;
305 default:
306 return -EINVAL;
307 }
308
309 return 0;
310}
311
312
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320
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323
324
325
326int __init netlbl_domhsh_init(u32 size)
327{
328 u32 iter;
329 struct netlbl_domhsh_tbl *hsh_tbl;
330
331 if (size == 0)
332 return -EINVAL;
333
334 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
335 if (hsh_tbl == NULL)
336 return -ENOMEM;
337 hsh_tbl->size = 1 << size;
338 hsh_tbl->tbl = kcalloc(hsh_tbl->size,
339 sizeof(struct list_head),
340 GFP_KERNEL);
341 if (hsh_tbl->tbl == NULL) {
342 kfree(hsh_tbl);
343 return -ENOMEM;
344 }
345 for (iter = 0; iter < hsh_tbl->size; iter++)
346 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
347
348 spin_lock(&netlbl_domhsh_lock);
349 rcu_assign_pointer(netlbl_domhsh, hsh_tbl);
350 spin_unlock(&netlbl_domhsh_lock);
351
352 return 0;
353}
354
355
356
357
358
359
360
361
362
363
364
365
366int netlbl_domhsh_add(struct netlbl_dom_map *entry,
367 struct netlbl_audit *audit_info)
368{
369 int ret_val = 0;
370 struct netlbl_dom_map *entry_old;
371 struct netlbl_af4list *iter4;
372 struct netlbl_af4list *tmp4;
373#if IS_ENABLED(CONFIG_IPV6)
374 struct netlbl_af6list *iter6;
375 struct netlbl_af6list *tmp6;
376#endif
377
378 ret_val = netlbl_domhsh_validate(entry);
379 if (ret_val != 0)
380 return ret_val;
381
382
383
384
385
386 rcu_read_lock();
387 spin_lock(&netlbl_domhsh_lock);
388 if (entry->domain != NULL)
389 entry_old = netlbl_domhsh_search(entry->domain);
390 else
391 entry_old = netlbl_domhsh_search_def(entry->domain);
392 if (entry_old == NULL) {
393 entry->valid = 1;
394
395 if (entry->domain != NULL) {
396 u32 bkt = netlbl_domhsh_hash(entry->domain);
397 list_add_tail_rcu(&entry->list,
398 &rcu_dereference(netlbl_domhsh)->tbl[bkt]);
399 } else {
400 INIT_LIST_HEAD(&entry->list);
401 rcu_assign_pointer(netlbl_domhsh_def, entry);
402 }
403
404 if (entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
405 netlbl_af4list_foreach_rcu(iter4,
406 &entry->def.addrsel->list4)
407 netlbl_domhsh_audit_add(entry, iter4, NULL,
408 ret_val, audit_info);
409#if IS_ENABLED(CONFIG_IPV6)
410 netlbl_af6list_foreach_rcu(iter6,
411 &entry->def.addrsel->list6)
412 netlbl_domhsh_audit_add(entry, NULL, iter6,
413 ret_val, audit_info);
414#endif
415 } else
416 netlbl_domhsh_audit_add(entry, NULL, NULL,
417 ret_val, audit_info);
418 } else if (entry_old->def.type == NETLBL_NLTYPE_ADDRSELECT &&
419 entry->def.type == NETLBL_NLTYPE_ADDRSELECT) {
420 struct list_head *old_list4;
421 struct list_head *old_list6;
422
423 old_list4 = &entry_old->def.addrsel->list4;
424 old_list6 = &entry_old->def.addrsel->list6;
425
426
427
428 netlbl_af4list_foreach_rcu(iter4, &entry->def.addrsel->list4)
429 if (netlbl_af4list_search_exact(iter4->addr,
430 iter4->mask,
431 old_list4)) {
432 ret_val = -EEXIST;
433 goto add_return;
434 }
435#if IS_ENABLED(CONFIG_IPV6)
436 netlbl_af6list_foreach_rcu(iter6, &entry->def.addrsel->list6)
437 if (netlbl_af6list_search_exact(&iter6->addr,
438 &iter6->mask,
439 old_list6)) {
440 ret_val = -EEXIST;
441 goto add_return;
442 }
443#endif
444
445 netlbl_af4list_foreach_safe(iter4, tmp4,
446 &entry->def.addrsel->list4) {
447 netlbl_af4list_remove_entry(iter4);
448 iter4->valid = 1;
449 ret_val = netlbl_af4list_add(iter4, old_list4);
450 netlbl_domhsh_audit_add(entry_old, iter4, NULL,
451 ret_val, audit_info);
452 if (ret_val != 0)
453 goto add_return;
454 }
455#if IS_ENABLED(CONFIG_IPV6)
456 netlbl_af6list_foreach_safe(iter6, tmp6,
457 &entry->def.addrsel->list6) {
458 netlbl_af6list_remove_entry(iter6);
459 iter6->valid = 1;
460 ret_val = netlbl_af6list_add(iter6, old_list6);
461 netlbl_domhsh_audit_add(entry_old, NULL, iter6,
462 ret_val, audit_info);
463 if (ret_val != 0)
464 goto add_return;
465 }
466#endif
467 } else
468 ret_val = -EINVAL;
469
470add_return:
471 spin_unlock(&netlbl_domhsh_lock);
472 rcu_read_unlock();
473 return ret_val;
474}
475
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479
480
481
482
483
484
485
486
487int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
488 struct netlbl_audit *audit_info)
489{
490 return netlbl_domhsh_add(entry, audit_info);
491}
492
493
494
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497
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500
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502
503
504
505int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
506 struct netlbl_audit *audit_info)
507{
508 int ret_val = 0;
509 struct audit_buffer *audit_buf;
510
511 if (entry == NULL)
512 return -ENOENT;
513
514 spin_lock(&netlbl_domhsh_lock);
515 if (entry->valid) {
516 entry->valid = 0;
517 if (entry != rcu_dereference(netlbl_domhsh_def))
518 list_del_rcu(&entry->list);
519 else
520 RCU_INIT_POINTER(netlbl_domhsh_def, NULL);
521 } else
522 ret_val = -ENOENT;
523 spin_unlock(&netlbl_domhsh_lock);
524
525 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
526 if (audit_buf != NULL) {
527 audit_log_format(audit_buf,
528 " nlbl_domain=%s res=%u",
529 entry->domain ? entry->domain : "(default)",
530 ret_val == 0 ? 1 : 0);
531 audit_log_end(audit_buf);
532 }
533
534 if (ret_val == 0) {
535 struct netlbl_af4list *iter4;
536 struct netlbl_domaddr4_map *map4;
537
538 switch (entry->def.type) {
539 case NETLBL_NLTYPE_ADDRSELECT:
540 netlbl_af4list_foreach_rcu(iter4,
541 &entry->def.addrsel->list4) {
542 map4 = netlbl_domhsh_addr4_entry(iter4);
543 cipso_v4_doi_putdef(map4->def.cipso);
544 }
545
546
547 break;
548 case NETLBL_NLTYPE_CIPSOV4:
549 cipso_v4_doi_putdef(entry->def.cipso);
550 break;
551 }
552 call_rcu(&entry->rcu, netlbl_domhsh_free_entry);
553 }
554
555 return ret_val;
556}
557
558
559
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561
562
563
564
565
566
567
568
569
570
571int netlbl_domhsh_remove_af4(const char *domain,
572 const struct in_addr *addr,
573 const struct in_addr *mask,
574 struct netlbl_audit *audit_info)
575{
576 struct netlbl_dom_map *entry_map;
577 struct netlbl_af4list *entry_addr;
578 struct netlbl_af4list *iter4;
579#if IS_ENABLED(CONFIG_IPV6)
580 struct netlbl_af6list *iter6;
581#endif
582 struct netlbl_domaddr4_map *entry;
583
584 rcu_read_lock();
585
586 if (domain)
587 entry_map = netlbl_domhsh_search(domain);
588 else
589 entry_map = netlbl_domhsh_search_def(domain);
590 if (entry_map == NULL ||
591 entry_map->def.type != NETLBL_NLTYPE_ADDRSELECT)
592 goto remove_af4_failure;
593
594 spin_lock(&netlbl_domhsh_lock);
595 entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
596 &entry_map->def.addrsel->list4);
597 spin_unlock(&netlbl_domhsh_lock);
598
599 if (entry_addr == NULL)
600 goto remove_af4_failure;
601 netlbl_af4list_foreach_rcu(iter4, &entry_map->def.addrsel->list4)
602 goto remove_af4_single_addr;
603#if IS_ENABLED(CONFIG_IPV6)
604 netlbl_af6list_foreach_rcu(iter6, &entry_map->def.addrsel->list6)
605 goto remove_af4_single_addr;
606#endif
607
608 netlbl_domhsh_remove_entry(entry_map, audit_info);
609
610remove_af4_single_addr:
611 rcu_read_unlock();
612
613
614
615 synchronize_rcu();
616 entry = netlbl_domhsh_addr4_entry(entry_addr);
617 cipso_v4_doi_putdef(entry->def.cipso);
618 kfree(entry);
619 return 0;
620
621remove_af4_failure:
622 rcu_read_unlock();
623 return -ENOENT;
624}
625
626
627
628
629
630
631
632
633
634
635
636
637int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
638{
639 int ret_val;
640 struct netlbl_dom_map *entry;
641
642 rcu_read_lock();
643 if (domain)
644 entry = netlbl_domhsh_search(domain);
645 else
646 entry = netlbl_domhsh_search_def(domain);
647 ret_val = netlbl_domhsh_remove_entry(entry, audit_info);
648 rcu_read_unlock();
649
650 return ret_val;
651}
652
653
654
655
656
657
658
659
660
661
662
663int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info)
664{
665 return netlbl_domhsh_remove(NULL, audit_info);
666}
667
668
669
670
671
672
673
674
675
676
677
678struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain)
679{
680 return netlbl_domhsh_search_def(domain);
681}
682
683
684
685
686
687
688
689
690
691
692
693
694struct netlbl_dommap_def *netlbl_domhsh_getentry_af4(const char *domain,
695 __be32 addr)
696{
697 struct netlbl_dom_map *dom_iter;
698 struct netlbl_af4list *addr_iter;
699
700 dom_iter = netlbl_domhsh_search_def(domain);
701 if (dom_iter == NULL)
702 return NULL;
703
704 if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT)
705 return &dom_iter->def;
706 addr_iter = netlbl_af4list_search(addr, &dom_iter->def.addrsel->list4);
707 if (addr_iter == NULL)
708 return NULL;
709 return &(netlbl_domhsh_addr4_entry(addr_iter)->def);
710}
711
712#if IS_ENABLED(CONFIG_IPV6)
713
714
715
716
717
718
719
720
721
722
723
724struct netlbl_dommap_def *netlbl_domhsh_getentry_af6(const char *domain,
725 const struct in6_addr *addr)
726{
727 struct netlbl_dom_map *dom_iter;
728 struct netlbl_af6list *addr_iter;
729
730 dom_iter = netlbl_domhsh_search_def(domain);
731 if (dom_iter == NULL)
732 return NULL;
733
734 if (dom_iter->def.type != NETLBL_NLTYPE_ADDRSELECT)
735 return &dom_iter->def;
736 addr_iter = netlbl_af6list_search(addr, &dom_iter->def.addrsel->list6);
737 if (addr_iter == NULL)
738 return NULL;
739 return &(netlbl_domhsh_addr6_entry(addr_iter)->def);
740}
741#endif
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758int netlbl_domhsh_walk(u32 *skip_bkt,
759 u32 *skip_chain,
760 int (*callback) (struct netlbl_dom_map *entry, void *arg),
761 void *cb_arg)
762{
763 int ret_val = -ENOENT;
764 u32 iter_bkt;
765 struct list_head *iter_list;
766 struct netlbl_dom_map *iter_entry;
767 u32 chain_cnt = 0;
768
769 rcu_read_lock();
770 for (iter_bkt = *skip_bkt;
771 iter_bkt < rcu_dereference(netlbl_domhsh)->size;
772 iter_bkt++, chain_cnt = 0) {
773 iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt];
774 list_for_each_entry_rcu(iter_entry, iter_list, list)
775 if (iter_entry->valid) {
776 if (chain_cnt++ < *skip_chain)
777 continue;
778 ret_val = callback(iter_entry, cb_arg);
779 if (ret_val < 0) {
780 chain_cnt--;
781 goto walk_return;
782 }
783 }
784 }
785
786walk_return:
787 rcu_read_unlock();
788 *skip_bkt = iter_bkt;
789 *skip_chain = chain_cnt;
790 return ret_val;
791}
792