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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->type == NETLBL_NLTYPE_ADDRSELECT) {
88 netlbl_af4list_foreach_safe(iter4, tmp4,
89 &ptr->type_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->type_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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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->type;
217 cipsov4 = map4->type_def.cipsov4;
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->type;
225 netlbl_af6list_audit_addr(audit_buf, 0, NULL,
226 &addr6->addr, &addr6->mask);
227#endif
228 } else {
229 type = entry->type;
230 cipsov4 = entry->type_def.cipsov4;
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->type) {
269 case NETLBL_NLTYPE_UNLABELED:
270 if (entry->type_def.cipsov4 != NULL ||
271 entry->type_def.addrsel != NULL)
272 return -EINVAL;
273 break;
274 case NETLBL_NLTYPE_CIPSOV4:
275 if (entry->type_def.cipsov4 == NULL)
276 return -EINVAL;
277 break;
278 case NETLBL_NLTYPE_ADDRSELECT:
279 netlbl_af4list_foreach(iter4, &entry->type_def.addrsel->list4) {
280 map4 = netlbl_domhsh_addr4_entry(iter4);
281 switch (map4->type) {
282 case NETLBL_NLTYPE_UNLABELED:
283 if (map4->type_def.cipsov4 != NULL)
284 return -EINVAL;
285 break;
286 case NETLBL_NLTYPE_CIPSOV4:
287 if (map4->type_def.cipsov4 == NULL)
288 return -EINVAL;
289 break;
290 default:
291 return -EINVAL;
292 }
293 }
294#if IS_ENABLED(CONFIG_IPV6)
295 netlbl_af6list_foreach(iter6, &entry->type_def.addrsel->list6) {
296 map6 = netlbl_domhsh_addr6_entry(iter6);
297 switch (map6->type) {
298 case NETLBL_NLTYPE_UNLABELED:
299 break;
300 default:
301 return -EINVAL;
302 }
303 }
304#endif
305 break;
306 default:
307 return -EINVAL;
308 }
309
310 return 0;
311}
312
313
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324
325
326
327int __init netlbl_domhsh_init(u32 size)
328{
329 u32 iter;
330 struct netlbl_domhsh_tbl *hsh_tbl;
331
332 if (size == 0)
333 return -EINVAL;
334
335 hsh_tbl = kmalloc(sizeof(*hsh_tbl), GFP_KERNEL);
336 if (hsh_tbl == NULL)
337 return -ENOMEM;
338 hsh_tbl->size = 1 << size;
339 hsh_tbl->tbl = kcalloc(hsh_tbl->size,
340 sizeof(struct list_head),
341 GFP_KERNEL);
342 if (hsh_tbl->tbl == NULL) {
343 kfree(hsh_tbl);
344 return -ENOMEM;
345 }
346 for (iter = 0; iter < hsh_tbl->size; iter++)
347 INIT_LIST_HEAD(&hsh_tbl->tbl[iter]);
348
349 spin_lock(&netlbl_domhsh_lock);
350 rcu_assign_pointer(netlbl_domhsh, hsh_tbl);
351 spin_unlock(&netlbl_domhsh_lock);
352
353 return 0;
354}
355
356
357
358
359
360
361
362
363
364
365
366
367int netlbl_domhsh_add(struct netlbl_dom_map *entry,
368 struct netlbl_audit *audit_info)
369{
370 int ret_val = 0;
371 struct netlbl_dom_map *entry_old;
372 struct netlbl_af4list *iter4;
373 struct netlbl_af4list *tmp4;
374#if IS_ENABLED(CONFIG_IPV6)
375 struct netlbl_af6list *iter6;
376 struct netlbl_af6list *tmp6;
377#endif
378
379 ret_val = netlbl_domhsh_validate(entry);
380 if (ret_val != 0)
381 return ret_val;
382
383
384
385
386
387 rcu_read_lock();
388 spin_lock(&netlbl_domhsh_lock);
389 if (entry->domain != NULL)
390 entry_old = netlbl_domhsh_search(entry->domain);
391 else
392 entry_old = netlbl_domhsh_search_def(entry->domain);
393 if (entry_old == NULL) {
394 entry->valid = 1;
395
396 if (entry->domain != NULL) {
397 u32 bkt = netlbl_domhsh_hash(entry->domain);
398 list_add_tail_rcu(&entry->list,
399 &rcu_dereference(netlbl_domhsh)->tbl[bkt]);
400 } else {
401 INIT_LIST_HEAD(&entry->list);
402 rcu_assign_pointer(netlbl_domhsh_def, entry);
403 }
404
405 if (entry->type == NETLBL_NLTYPE_ADDRSELECT) {
406 netlbl_af4list_foreach_rcu(iter4,
407 &entry->type_def.addrsel->list4)
408 netlbl_domhsh_audit_add(entry, iter4, NULL,
409 ret_val, audit_info);
410#if IS_ENABLED(CONFIG_IPV6)
411 netlbl_af6list_foreach_rcu(iter6,
412 &entry->type_def.addrsel->list6)
413 netlbl_domhsh_audit_add(entry, NULL, iter6,
414 ret_val, audit_info);
415#endif
416 } else
417 netlbl_domhsh_audit_add(entry, NULL, NULL,
418 ret_val, audit_info);
419 } else if (entry_old->type == NETLBL_NLTYPE_ADDRSELECT &&
420 entry->type == NETLBL_NLTYPE_ADDRSELECT) {
421 struct list_head *old_list4;
422 struct list_head *old_list6;
423
424 old_list4 = &entry_old->type_def.addrsel->list4;
425 old_list6 = &entry_old->type_def.addrsel->list6;
426
427
428
429 netlbl_af4list_foreach_rcu(iter4,
430 &entry->type_def.addrsel->list4)
431 if (netlbl_af4list_search_exact(iter4->addr,
432 iter4->mask,
433 old_list4)) {
434 ret_val = -EEXIST;
435 goto add_return;
436 }
437#if IS_ENABLED(CONFIG_IPV6)
438 netlbl_af6list_foreach_rcu(iter6,
439 &entry->type_def.addrsel->list6)
440 if (netlbl_af6list_search_exact(&iter6->addr,
441 &iter6->mask,
442 old_list6)) {
443 ret_val = -EEXIST;
444 goto add_return;
445 }
446#endif
447
448 netlbl_af4list_foreach_safe(iter4, tmp4,
449 &entry->type_def.addrsel->list4) {
450 netlbl_af4list_remove_entry(iter4);
451 iter4->valid = 1;
452 ret_val = netlbl_af4list_add(iter4, old_list4);
453 netlbl_domhsh_audit_add(entry_old, iter4, NULL,
454 ret_val, audit_info);
455 if (ret_val != 0)
456 goto add_return;
457 }
458#if IS_ENABLED(CONFIG_IPV6)
459 netlbl_af6list_foreach_safe(iter6, tmp6,
460 &entry->type_def.addrsel->list6) {
461 netlbl_af6list_remove_entry(iter6);
462 iter6->valid = 1;
463 ret_val = netlbl_af6list_add(iter6, old_list6);
464 netlbl_domhsh_audit_add(entry_old, NULL, iter6,
465 ret_val, audit_info);
466 if (ret_val != 0)
467 goto add_return;
468 }
469#endif
470 } else
471 ret_val = -EINVAL;
472
473add_return:
474 spin_unlock(&netlbl_domhsh_lock);
475 rcu_read_unlock();
476 return ret_val;
477}
478
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485
486
487
488
489
490int netlbl_domhsh_add_default(struct netlbl_dom_map *entry,
491 struct netlbl_audit *audit_info)
492{
493 return netlbl_domhsh_add(entry, audit_info);
494}
495
496
497
498
499
500
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505
506
507
508int netlbl_domhsh_remove_entry(struct netlbl_dom_map *entry,
509 struct netlbl_audit *audit_info)
510{
511 int ret_val = 0;
512 struct audit_buffer *audit_buf;
513
514 if (entry == NULL)
515 return -ENOENT;
516
517 spin_lock(&netlbl_domhsh_lock);
518 if (entry->valid) {
519 entry->valid = 0;
520 if (entry != rcu_dereference(netlbl_domhsh_def))
521 list_del_rcu(&entry->list);
522 else
523 RCU_INIT_POINTER(netlbl_domhsh_def, NULL);
524 } else
525 ret_val = -ENOENT;
526 spin_unlock(&netlbl_domhsh_lock);
527
528 audit_buf = netlbl_audit_start_common(AUDIT_MAC_MAP_DEL, audit_info);
529 if (audit_buf != NULL) {
530 audit_log_format(audit_buf,
531 " nlbl_domain=%s res=%u",
532 entry->domain ? entry->domain : "(default)",
533 ret_val == 0 ? 1 : 0);
534 audit_log_end(audit_buf);
535 }
536
537 if (ret_val == 0) {
538 struct netlbl_af4list *iter4;
539 struct netlbl_domaddr4_map *map4;
540
541 switch (entry->type) {
542 case NETLBL_NLTYPE_ADDRSELECT:
543 netlbl_af4list_foreach_rcu(iter4,
544 &entry->type_def.addrsel->list4) {
545 map4 = netlbl_domhsh_addr4_entry(iter4);
546 cipso_v4_doi_putdef(map4->type_def.cipsov4);
547 }
548
549
550 break;
551 case NETLBL_NLTYPE_CIPSOV4:
552 cipso_v4_doi_putdef(entry->type_def.cipsov4);
553 break;
554 }
555 call_rcu(&entry->rcu, netlbl_domhsh_free_entry);
556 }
557
558 return ret_val;
559}
560
561
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565
566
567
568
569
570
571
572
573
574int netlbl_domhsh_remove_af4(const char *domain,
575 const struct in_addr *addr,
576 const struct in_addr *mask,
577 struct netlbl_audit *audit_info)
578{
579 struct netlbl_dom_map *entry_map;
580 struct netlbl_af4list *entry_addr;
581 struct netlbl_af4list *iter4;
582#if IS_ENABLED(CONFIG_IPV6)
583 struct netlbl_af6list *iter6;
584#endif
585 struct netlbl_domaddr4_map *entry;
586
587 rcu_read_lock();
588
589 if (domain)
590 entry_map = netlbl_domhsh_search(domain);
591 else
592 entry_map = netlbl_domhsh_search_def(domain);
593 if (entry_map == NULL || entry_map->type != NETLBL_NLTYPE_ADDRSELECT)
594 goto remove_af4_failure;
595
596 spin_lock(&netlbl_domhsh_lock);
597 entry_addr = netlbl_af4list_remove(addr->s_addr, mask->s_addr,
598 &entry_map->type_def.addrsel->list4);
599 spin_unlock(&netlbl_domhsh_lock);
600
601 if (entry_addr == NULL)
602 goto remove_af4_failure;
603 netlbl_af4list_foreach_rcu(iter4, &entry_map->type_def.addrsel->list4)
604 goto remove_af4_single_addr;
605#if IS_ENABLED(CONFIG_IPV6)
606 netlbl_af6list_foreach_rcu(iter6, &entry_map->type_def.addrsel->list6)
607 goto remove_af4_single_addr;
608#endif
609
610 netlbl_domhsh_remove_entry(entry_map, audit_info);
611
612remove_af4_single_addr:
613 rcu_read_unlock();
614
615
616
617 synchronize_rcu();
618 entry = netlbl_domhsh_addr4_entry(entry_addr);
619 cipso_v4_doi_putdef(entry->type_def.cipsov4);
620 kfree(entry);
621 return 0;
622
623remove_af4_failure:
624 rcu_read_unlock();
625 return -ENOENT;
626}
627
628
629
630
631
632
633
634
635
636
637
638
639int netlbl_domhsh_remove(const char *domain, struct netlbl_audit *audit_info)
640{
641 int ret_val;
642 struct netlbl_dom_map *entry;
643
644 rcu_read_lock();
645 if (domain)
646 entry = netlbl_domhsh_search(domain);
647 else
648 entry = netlbl_domhsh_search_def(domain);
649 ret_val = netlbl_domhsh_remove_entry(entry, audit_info);
650 rcu_read_unlock();
651
652 return ret_val;
653}
654
655
656
657
658
659
660
661
662
663
664
665int netlbl_domhsh_remove_default(struct netlbl_audit *audit_info)
666{
667 return netlbl_domhsh_remove(NULL, audit_info);
668}
669
670
671
672
673
674
675
676
677
678
679
680struct netlbl_dom_map *netlbl_domhsh_getentry(const char *domain)
681{
682 return netlbl_domhsh_search_def(domain);
683}
684
685
686
687
688
689
690
691
692
693
694
695
696struct netlbl_domaddr4_map *netlbl_domhsh_getentry_af4(const char *domain,
697 __be32 addr)
698{
699 struct netlbl_dom_map *dom_iter;
700 struct netlbl_af4list *addr_iter;
701
702 dom_iter = netlbl_domhsh_search_def(domain);
703 if (dom_iter == NULL)
704 return NULL;
705 if (dom_iter->type != NETLBL_NLTYPE_ADDRSELECT)
706 return NULL;
707
708 addr_iter = netlbl_af4list_search(addr,
709 &dom_iter->type_def.addrsel->list4);
710 if (addr_iter == NULL)
711 return NULL;
712
713 return netlbl_domhsh_addr4_entry(addr_iter);
714}
715
716#if IS_ENABLED(CONFIG_IPV6)
717
718
719
720
721
722
723
724
725
726
727
728struct netlbl_domaddr6_map *netlbl_domhsh_getentry_af6(const char *domain,
729 const struct in6_addr *addr)
730{
731 struct netlbl_dom_map *dom_iter;
732 struct netlbl_af6list *addr_iter;
733
734 dom_iter = netlbl_domhsh_search_def(domain);
735 if (dom_iter == NULL)
736 return NULL;
737 if (dom_iter->type != NETLBL_NLTYPE_ADDRSELECT)
738 return NULL;
739
740 addr_iter = netlbl_af6list_search(addr,
741 &dom_iter->type_def.addrsel->list6);
742 if (addr_iter == NULL)
743 return NULL;
744
745 return netlbl_domhsh_addr6_entry(addr_iter);
746}
747#endif
748
749
750
751
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754
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760
761
762
763
764int netlbl_domhsh_walk(u32 *skip_bkt,
765 u32 *skip_chain,
766 int (*callback) (struct netlbl_dom_map *entry, void *arg),
767 void *cb_arg)
768{
769 int ret_val = -ENOENT;
770 u32 iter_bkt;
771 struct list_head *iter_list;
772 struct netlbl_dom_map *iter_entry;
773 u32 chain_cnt = 0;
774
775 rcu_read_lock();
776 for (iter_bkt = *skip_bkt;
777 iter_bkt < rcu_dereference(netlbl_domhsh)->size;
778 iter_bkt++, chain_cnt = 0) {
779 iter_list = &rcu_dereference(netlbl_domhsh)->tbl[iter_bkt];
780 list_for_each_entry_rcu(iter_entry, iter_list, list)
781 if (iter_entry->valid) {
782 if (chain_cnt++ < *skip_chain)
783 continue;
784 ret_val = callback(iter_entry, cb_arg);
785 if (ret_val < 0) {
786 chain_cnt--;
787 goto walk_return;
788 }
789 }
790 }
791
792walk_return:
793 rcu_read_unlock();
794 *skip_bkt = iter_bkt;
795 *skip_chain = chain_cnt;
796 return ret_val;
797}
798