summaryrefslogtreecommitdiff
path: root/net/netlabel/netlabel_kapi.c
blob: 2b0ef55cf89eeb8bfa3a5935febaf29250753202 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * NetLabel Kernel API
 *
 * This file defines the kernel API for the NetLabel system.  The NetLabel
 * system manages static and dynamic label mappings for network protocols such
 * as CIPSO and RIPSO.
 *
 * Author: Paul Moore <paul@paul-moore.com>
 */

/*
 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006, 2008
 */

#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/audit.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <net/calipso.h>
#include <asm/bug.h>
#include <linux/atomic.h>

#include "netlabel_domainhash.h"
#include "netlabel_unlabeled.h"
#include "netlabel_cipso_v4.h"
#include "netlabel_calipso.h"
#include "netlabel_user.h"
#include "netlabel_mgmt.h"
#include "netlabel_addrlist.h"

/*
 * Configuration Functions
 */

/**
 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
 * @domain: the domain mapping to remove
 * @family: address family
 * @addr: IP address
 * @mask: IP address mask
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Removes a NetLabel/LSM domain mapping.  A @domain value of NULL causes the
 * default domain mapping to be removed.  Returns zero on success, negative
 * values on failure.
 *
 */
int netlbl_cfg_map_del(const char *domain,
		       u16 family,
		       const void *addr,
		       const void *mask,
		       struct netlbl_audit *audit_info)
{
	if (addr == NULL && mask == NULL) {
		return netlbl_domhsh_remove(domain, family, audit_info);
	} else if (addr != NULL && mask != NULL) {
		switch (family) {
		case AF_INET:
			return netlbl_domhsh_remove_af4(domain, addr, mask,
							audit_info);
#if IS_ENABLED(CONFIG_IPV6)
		case AF_INET6:
			return netlbl_domhsh_remove_af6(domain, addr, mask,
							audit_info);
#endif /* IPv6 */
		default:
			return -EPFNOSUPPORT;
		}
	} else
		return -EINVAL;
}

/**
 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
 * @domain: the domain mapping to add
 * @family: address family
 * @addr: IP address
 * @mask: IP address mask
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Adds a new unlabeled NetLabel/LSM domain mapping.  A @domain value of NULL
 * causes a new default domain mapping to be added.  Returns zero on success,
 * negative values on failure.
 *
 */
int netlbl_cfg_unlbl_map_add(const char *domain,
			     u16 family,
			     const void *addr,
			     const void *mask,
			     struct netlbl_audit *audit_info)
{
	int ret_val = -ENOMEM;
	struct netlbl_dom_map *entry;
	struct netlbl_domaddr_map *addrmap = NULL;
	struct netlbl_domaddr4_map *map4 = NULL;
	struct netlbl_domaddr6_map *map6 = NULL;

	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
	if (entry == NULL)
		return -ENOMEM;
	if (domain != NULL) {
		entry->domain = kstrdup(domain, GFP_ATOMIC);
		if (entry->domain == NULL)
			goto cfg_unlbl_map_add_failure;
	}
	entry->family = family;

	if (addr == NULL && mask == NULL)
		entry->def.type = NETLBL_NLTYPE_UNLABELED;
	else if (addr != NULL && mask != NULL) {
		addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
		if (addrmap == NULL)
			goto cfg_unlbl_map_add_failure;
		INIT_LIST_HEAD(&addrmap->list4);
		INIT_LIST_HEAD(&addrmap->list6);

		switch (family) {
		case AF_INET: {
			const struct in_addr *addr4 = addr;
			const struct in_addr *mask4 = mask;
			map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
			if (map4 == NULL)
				goto cfg_unlbl_map_add_failure;
			map4->def.type = NETLBL_NLTYPE_UNLABELED;
			map4->list.addr = addr4->s_addr & mask4->s_addr;
			map4->list.mask = mask4->s_addr;
			map4->list.valid = 1;
			ret_val = netlbl_af4list_add(&map4->list,
						     &addrmap->list4);
			if (ret_val != 0)
				goto cfg_unlbl_map_add_failure;
			break;
			}
#if IS_ENABLED(CONFIG_IPV6)
		case AF_INET6: {
			const struct in6_addr *addr6 = addr;
			const struct in6_addr *mask6 = mask;
			map6 = kzalloc(sizeof(*map6), GFP_ATOMIC);
			if (map6 == NULL)
				goto cfg_unlbl_map_add_failure;
			map6->def.type = NETLBL_NLTYPE_UNLABELED;
			map6->list.addr = *addr6;
			map6->list.addr.s6_addr32[0] &= mask6->s6_addr32[0];
			map6->list.addr.s6_addr32[1] &= mask6->s6_addr32[1];
			map6->list.addr.s6_addr32[2] &= mask6->s6_addr32[2];
			map6->list.addr.s6_addr32[3] &= mask6->s6_addr32[3];
			map6->list.mask = *mask6;
			map6->list.valid = 1;
			ret_val = netlbl_af6list_add(&map6->list,
						     &addrmap->list6);
			if (ret_val != 0)
				goto cfg_unlbl_map_add_failure;
			break;
			}
#endif /* IPv6 */
		default:
			goto cfg_unlbl_map_add_failure;
		}

		entry->def.addrsel = addrmap;
		entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
	} else {
		ret_val = -EINVAL;
		goto cfg_unlbl_map_add_failure;
	}

	ret_val = netlbl_domhsh_add(entry, audit_info);
	if (ret_val != 0)
		goto cfg_unlbl_map_add_failure;

	return 0;

cfg_unlbl_map_add_failure:
	kfree(entry->domain);
	kfree(entry);
	kfree(addrmap);
	kfree(map4);
	kfree(map6);
	return ret_val;
}


/**
 * netlbl_cfg_unlbl_static_add - Adds a new static label
 * @net: network namespace
 * @dev_name: interface name
 * @addr: IP address in network byte order (struct in[6]_addr)
 * @mask: address mask in network byte order (struct in[6]_addr)
 * @family: address family
 * @secid: LSM secid value for the entry
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Adds a new NetLabel static label to be used when protocol provided labels
 * are not present on incoming traffic.  If @dev_name is NULL then the default
 * interface will be used.  Returns zero on success, negative values on failure.
 *
 */
int netlbl_cfg_unlbl_static_add(struct net *net,
				const char *dev_name,
				const void *addr,
				const void *mask,
				u16 family,
				u32 secid,
				struct netlbl_audit *audit_info)
{
	u32 addr_len;

	switch (family) {
	case AF_INET:
		addr_len = sizeof(struct in_addr);
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		addr_len = sizeof(struct in6_addr);
		break;
#endif /* IPv6 */
	default:
		return -EPFNOSUPPORT;
	}

	return netlbl_unlhsh_add(net,
				 dev_name, addr, mask, addr_len,
				 secid, audit_info);
}

/**
 * netlbl_cfg_unlbl_static_del - Removes an existing static label
 * @net: network namespace
 * @dev_name: interface name
 * @addr: IP address in network byte order (struct in[6]_addr)
 * @mask: address mask in network byte order (struct in[6]_addr)
 * @family: address family
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Removes an existing NetLabel static label used when protocol provided labels
 * are not present on incoming traffic.  If @dev_name is NULL then the default
 * interface will be used.  Returns zero on success, negative values on failure.
 *
 */
int netlbl_cfg_unlbl_static_del(struct net *net,
				const char *dev_name,
				const void *addr,
				const void *mask,
				u16 family,
				struct netlbl_audit *audit_info)
{
	u32 addr_len;

	switch (family) {
	case AF_INET:
		addr_len = sizeof(struct in_addr);
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		addr_len = sizeof(struct in6_addr);
		break;
#endif /* IPv6 */
	default:
		return -EPFNOSUPPORT;
	}

	return netlbl_unlhsh_remove(net,
				    dev_name, addr, mask, addr_len,
				    audit_info);
}

/**
 * netlbl_cfg_cipsov4_add - Add a new CIPSOv4 DOI definition
 * @doi_def: CIPSO DOI definition
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Add a new CIPSO DOI definition as defined by @doi_def.  Returns zero on
 * success and negative values on failure.
 *
 */
int netlbl_cfg_cipsov4_add(struct cipso_v4_doi *doi_def,
			   struct netlbl_audit *audit_info)
{
	return cipso_v4_doi_add(doi_def, audit_info);
}

/**
 * netlbl_cfg_cipsov4_del - Remove an existing CIPSOv4 DOI definition
 * @doi: CIPSO DOI
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Remove an existing CIPSO DOI definition matching @doi.  Returns zero on
 * success and negative values on failure.
 *
 */
void netlbl_cfg_cipsov4_del(u32 doi, struct netlbl_audit *audit_info)
{
	cipso_v4_doi_remove(doi, audit_info);
}

/**
 * netlbl_cfg_cipsov4_map_add - Add a new CIPSOv4 DOI mapping
 * @doi: the CIPSO DOI
 * @domain: the domain mapping to add
 * @addr: IP address
 * @mask: IP address mask
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Add a new NetLabel/LSM domain mapping for the given CIPSO DOI to the NetLabel
 * subsystem.  A @domain value of NULL adds a new default domain mapping.
 * Returns zero on success, negative values on failure.
 *
 */
int netlbl_cfg_cipsov4_map_add(u32 doi,
			       const char *domain,
			       const struct in_addr *addr,
			       const struct in_addr *mask,
			       struct netlbl_audit *audit_info)
{
	int ret_val = -ENOMEM;
	struct cipso_v4_doi *doi_def;
	struct netlbl_dom_map *entry;
	struct netlbl_domaddr_map *addrmap = NULL;
	struct netlbl_domaddr4_map *addrinfo = NULL;

	doi_def = cipso_v4_doi_getdef(doi);
	if (doi_def == NULL)
		return -ENOENT;

	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
	if (entry == NULL)
		goto out_entry;
	entry->family = AF_INET;
	if (domain != NULL) {
		entry->domain = kstrdup(domain, GFP_ATOMIC);
		if (entry->domain == NULL)
			goto out_domain;
	}

	if (addr == NULL && mask == NULL) {
		entry->def.cipso = doi_def;
		entry->def.type = NETLBL_NLTYPE_CIPSOV4;
	} else if (addr != NULL && mask != NULL) {
		addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
		if (addrmap == NULL)
			goto out_addrmap;
		INIT_LIST_HEAD(&addrmap->list4);
		INIT_LIST_HEAD(&addrmap->list6);

		addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
		if (addrinfo == NULL)
			goto out_addrinfo;
		addrinfo->def.cipso = doi_def;
		addrinfo->def.type = NETLBL_NLTYPE_CIPSOV4;
		addrinfo->list.addr = addr->s_addr & mask->s_addr;
		addrinfo->list.mask = mask->s_addr;
		addrinfo->list.valid = 1;
		ret_val = netlbl_af4list_add(&addrinfo->list, &addrmap->list4);
		if (ret_val != 0)
			goto cfg_cipsov4_map_add_failure;

		entry->def.addrsel = addrmap;
		entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
	} else {
		ret_val = -EINVAL;
		goto out_addrmap;
	}

	ret_val = netlbl_domhsh_add(entry, audit_info);
	if (ret_val != 0)
		goto cfg_cipsov4_map_add_failure;

	return 0;

cfg_cipsov4_map_add_failure:
	kfree(addrinfo);
out_addrinfo:
	kfree(addrmap);
out_addrmap:
	kfree(entry->domain);
out_domain:
	kfree(entry);
out_entry:
	cipso_v4_doi_putdef(doi_def);
	return ret_val;
}

/**
 * netlbl_cfg_calipso_add - Add a new CALIPSO DOI definition
 * @doi_def: CALIPSO DOI definition
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Add a new CALIPSO DOI definition as defined by @doi_def.  Returns zero on
 * success and negative values on failure.
 *
 */
int netlbl_cfg_calipso_add(struct calipso_doi *doi_def,
			   struct netlbl_audit *audit_info)
{
#if IS_ENABLED(CONFIG_IPV6)
	return calipso_doi_add(doi_def, audit_info);
#else /* IPv6 */
	return -ENOSYS;
#endif /* IPv6 */
}

/**
 * netlbl_cfg_calipso_del - Remove an existing CALIPSO DOI definition
 * @doi: CALIPSO DOI
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Remove an existing CALIPSO DOI definition matching @doi.  Returns zero on
 * success and negative values on failure.
 *
 */
void netlbl_cfg_calipso_del(u32 doi, struct netlbl_audit *audit_info)
{
#if IS_ENABLED(CONFIG_IPV6)
	calipso_doi_remove(doi, audit_info);
#endif /* IPv6 */
}

/**
 * netlbl_cfg_calipso_map_add - Add a new CALIPSO DOI mapping
 * @doi: the CALIPSO DOI
 * @domain: the domain mapping to add
 * @addr: IP address
 * @mask: IP address mask
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Add a new NetLabel/LSM domain mapping for the given CALIPSO DOI to the
 * NetLabel subsystem.  A @domain value of NULL adds a new default domain
 * mapping.  Returns zero on success, negative values on failure.
 *
 */
int netlbl_cfg_calipso_map_add(u32 doi,
			       const char *domain,
			       const struct in6_addr *addr,
			       const struct in6_addr *mask,
			       struct netlbl_audit *audit_info)
{
#if IS_ENABLED(CONFIG_IPV6)
	int ret_val = -ENOMEM;
	struct calipso_doi *doi_def;
	struct netlbl_dom_map *entry;
	struct netlbl_domaddr_map *addrmap = NULL;
	struct netlbl_domaddr6_map *addrinfo = NULL;

	doi_def = calipso_doi_getdef(doi);
	if (doi_def == NULL)
		return -ENOENT;

	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
	if (entry == NULL)
		goto out_entry;
	entry->family = AF_INET6;
	if (domain != NULL) {
		entry->domain = kstrdup(domain, GFP_ATOMIC);
		if (entry->domain == NULL)
			goto out_domain;
	}

	if (addr == NULL && mask == NULL) {
		entry->def.calipso = doi_def;
		entry->def.type = NETLBL_NLTYPE_CALIPSO;
	} else if (addr != NULL && mask != NULL) {
		addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
		if (addrmap == NULL)
			goto out_addrmap;
		INIT_LIST_HEAD(&addrmap->list4);
		INIT_LIST_HEAD(&addrmap->list6);

		addrinfo = kzalloc(sizeof(*addrinfo), GFP_ATOMIC);
		if (addrinfo == NULL)
			goto out_addrinfo;
		addrinfo->def.calipso = doi_def;
		addrinfo->def.type = NETLBL_NLTYPE_CALIPSO;
		addrinfo->list.addr = *addr;
		addrinfo->list.addr.s6_addr32[0] &= mask->s6_addr32[0];
		addrinfo->list.addr.s6_addr32[1] &= mask->s6_addr32[1];
		addrinfo->list.addr.s6_addr32[2] &= mask->s6_addr32[2];
		addrinfo->list.addr.s6_addr32[3] &= mask->s6_addr32[3];
		addrinfo->list.mask = *mask;
		addrinfo->list.valid = 1;
		ret_val = netlbl_af6list_add(&addrinfo->list, &addrmap->list6);
		if (ret_val != 0)
			goto cfg_calipso_map_add_failure;

		entry->def.addrsel = addrmap;
		entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
	} else {
		ret_val = -EINVAL;
		goto out_addrmap;
	}

	ret_val = netlbl_domhsh_add(entry, audit_info);
	if (ret_val != 0)
		goto cfg_calipso_map_add_failure;

	return 0;

cfg_calipso_map_add_failure:
	kfree(addrinfo);
out_addrinfo:
	kfree(addrmap);
out_addrmap:
	kfree(entry->domain);
out_domain:
	kfree(entry);
out_entry:
	calipso_doi_putdef(doi_def);
	return ret_val;
#else /* IPv6 */
	return -ENOSYS;
#endif /* IPv6 */
}

/*
 * Security Attribute Functions
 */

#define _CM_F_NONE	0x00000000
#define _CM_F_ALLOC	0x00000001
#define _CM_F_WALK	0x00000002

/**
 * _netlbl_catmap_getnode - Get a individual node from a catmap
 * @catmap: pointer to the category bitmap
 * @offset: the requested offset
 * @cm_flags: catmap flags, see _CM_F_*
 * @gfp_flags: memory allocation flags
 *
 * Description:
 * Iterate through the catmap looking for the node associated with @offset.
 * If the _CM_F_ALLOC flag is set in @cm_flags and there is no associated node,
 * one will be created and inserted into the catmap.  If the _CM_F_WALK flag is
 * set in @cm_flags and there is no associated node, the next highest node will
 * be returned.  Returns a pointer to the node on success, NULL on failure.
 *
 */
static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
					     struct netlbl_lsm_catmap **catmap,
					     u32 offset,
					     unsigned int cm_flags,
					     gfp_t gfp_flags)
{
	struct netlbl_lsm_catmap *iter = *catmap;
	struct netlbl_lsm_catmap *prev = NULL;

	if (iter == NULL)
		goto catmap_getnode_alloc;
	if (offset < iter->startbit)
		goto catmap_getnode_walk;
	while (iter && offset >= (iter->startbit + NETLBL_CATMAP_SIZE)) {
		prev = iter;
		iter = iter->next;
	}
	if (iter == NULL || offset < iter->startbit)
		goto catmap_getnode_walk;

	return iter;

catmap_getnode_walk:
	if (cm_flags & _CM_F_WALK)
		return iter;
catmap_getnode_alloc:
	if (!(cm_flags & _CM_F_ALLOC))
		return NULL;

	iter = netlbl_catmap_alloc(gfp_flags);
	if (iter == NULL)
		return NULL;
	iter->startbit = offset & ~(NETLBL_CATMAP_SIZE - 1);

	if (prev == NULL) {
		iter->next = *catmap;
		*catmap = iter;
	} else {
		iter->next = prev->next;
		prev->next = iter;
	}

	return iter;
}

/**
 * netlbl_catmap_walk - Walk a LSM secattr catmap looking for a bit
 * @catmap: the category bitmap
 * @offset: the offset to start searching at, in bits
 *
 * Description:
 * This function walks a LSM secattr category bitmap starting at @offset and
 * returns the spot of the first set bit or -ENOENT if no bits are set.
 *
 */
int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
{
	struct netlbl_lsm_catmap *iter = catmap;
	u32 idx;
	u32 bit;
	NETLBL_CATMAP_MAPTYPE bitmap;

	iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
	if (iter == NULL)
		return -ENOENT;
	if (offset > iter->startbit) {
		offset -= iter->startbit;
		idx = offset / NETLBL_CATMAP_MAPSIZE;
		bit = offset % NETLBL_CATMAP_MAPSIZE;
	} else {
		idx = 0;
		bit = 0;
	}
	bitmap = iter->bitmap[idx] >> bit;

	for (;;) {
		if (bitmap != 0) {
			while ((bitmap & NETLBL_CATMAP_BIT) == 0) {
				bitmap >>= 1;
				bit++;
			}
			return iter->startbit +
			       (NETLBL_CATMAP_MAPSIZE * idx) + bit;
		}
		if (++idx >= NETLBL_CATMAP_MAPCNT) {
			if (iter->next != NULL) {
				iter = iter->next;
				idx = 0;
			} else
				return -ENOENT;
		}
		bitmap = iter->bitmap[idx];
		bit = 0;
	}

	return -ENOENT;
}
EXPORT_SYMBOL(netlbl_catmap_walk);

/**
 * netlbl_catmap_walkrng - Find the end of a string of set bits
 * @catmap: the category bitmap
 * @offset: the offset to start searching at, in bits
 *
 * Description:
 * This function walks a LSM secattr category bitmap starting at @offset and
 * returns the spot of the first cleared bit or -ENOENT if the offset is past
 * the end of the bitmap.
 *
 */
int netlbl_catmap_walkrng(struct netlbl_lsm_catmap *catmap, u32 offset)
{
	struct netlbl_lsm_catmap *iter;
	struct netlbl_lsm_catmap *prev = NULL;
	u32 idx;
	u32 bit;
	NETLBL_CATMAP_MAPTYPE bitmask;
	NETLBL_CATMAP_MAPTYPE bitmap;

	iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0);
	if (iter == NULL)
		return -ENOENT;
	if (offset > iter->startbit) {
		offset -= iter->startbit;
		idx = offset / NETLBL_CATMAP_MAPSIZE;
		bit = offset % NETLBL_CATMAP_MAPSIZE;
	} else {
		idx = 0;
		bit = 0;
	}
	bitmask = NETLBL_CATMAP_BIT << bit;

	for (;;) {
		bitmap = iter->bitmap[idx];
		while (bitmask != 0 && (bitmap & bitmask) != 0) {
			bitmask <<= 1;
			bit++;
		}

		if (prev && idx == 0 && bit == 0)
			return prev->startbit + NETLBL_CATMAP_SIZE - 1;
		else if (bitmask != 0)
			return iter->startbit +
				(NETLBL_CATMAP_MAPSIZE * idx) + bit - 1;
		else if (++idx >= NETLBL_CATMAP_MAPCNT) {
			if (iter->next == NULL)
				return iter->startbit + NETLBL_CATMAP_SIZE - 1;
			prev = iter;
			iter = iter->next;
			idx = 0;
		}
		bitmask = NETLBL_CATMAP_BIT;
		bit = 0;
	}

	return -ENOENT;
}

/**
 * netlbl_catmap_getlong - Export an unsigned long bitmap
 * @catmap: pointer to the category bitmap
 * @offset: pointer to the requested offset
 * @bitmap: the exported bitmap
 *
 * Description:
 * Export a bitmap with an offset greater than or equal to @offset and return
 * it in @bitmap.  The @offset must be aligned to an unsigned long and will be
 * updated on return if different from what was requested; if the catmap is
 * empty at the requested offset and beyond, the @offset is set to (u32)-1.
 * Returns zero on sucess, negative values on failure.
 *
 */
int netlbl_catmap_getlong(struct netlbl_lsm_catmap *catmap,
			  u32 *offset,
			  unsigned long *bitmap)
{
	struct netlbl_lsm_catmap *iter;
	u32 off = *offset;
	u32 idx;

	/* only allow aligned offsets */
	if ((off & (BITS_PER_LONG - 1)) != 0)
		return -EINVAL;

	if (off < catmap->startbit) {
		off = catmap->startbit;
		*offset = off;
	}
	iter = _netlbl_catmap_getnode(&catmap, off, _CM_F_WALK, 0);
	if (iter == NULL) {
		*offset = (u32)-1;
		return 0;
	}

	if (off < iter->startbit) {
		*offset = iter->startbit;
		off = 0;
	} else
		off -= iter->startbit;
	idx = off / NETLBL_CATMAP_MAPSIZE;
	*bitmap = iter->bitmap[idx] >> (off % NETLBL_CATMAP_MAPSIZE);

	return 0;
}

/**
 * netlbl_catmap_setbit - Set a bit in a LSM secattr catmap
 * @catmap: pointer to the category bitmap
 * @bit: the bit to set
 * @flags: memory allocation flags
 *
 * Description:
 * Set the bit specified by @bit in @catmap.  Returns zero on success,
 * negative values on failure.
 *
 */
int netlbl_catmap_setbit(struct netlbl_lsm_catmap **catmap,
			 u32 bit,
			 gfp_t flags)
{
	struct netlbl_lsm_catmap *iter;
	u32 idx;

	iter = _netlbl_catmap_getnode(catmap, bit, _CM_F_ALLOC, flags);
	if (iter == NULL)
		return -ENOMEM;

	bit -= iter->startbit;
	idx = bit / NETLBL_CATMAP_MAPSIZE;
	iter->bitmap[idx] |= NETLBL_CATMAP_BIT << (bit % NETLBL_CATMAP_MAPSIZE);

	return 0;
}
EXPORT_SYMBOL(netlbl_catmap_setbit);

/**
 * netlbl_catmap_setrng - Set a range of bits in a LSM secattr catmap
 * @catmap: pointer to the category bitmap
 * @start: the starting bit
 * @end: the last bit in the string
 * @flags: memory allocation flags
 *
 * Description:
 * Set a range of bits, starting at @start and ending with @end.  Returns zero
 * on success, negative values on failure.
 *
 */
int netlbl_catmap_setrng(struct netlbl_lsm_catmap **catmap,
			 u32 start,
			 u32 end,
			 gfp_t flags)
{
	int rc = 0;
	u32 spot = start;

	while (rc == 0 && spot <= end) {
		if (((spot & (BITS_PER_LONG - 1)) == 0) &&
		    ((end - spot) > BITS_PER_LONG)) {
			rc = netlbl_catmap_setlong(catmap,
						   spot,
						   (unsigned long)-1,
						   flags);
			spot += BITS_PER_LONG;
		} else
			rc = netlbl_catmap_setbit(catmap, spot++, flags);
	}

	return rc;
}

/**
 * netlbl_catmap_setlong - Import an unsigned long bitmap
 * @catmap: pointer to the category bitmap
 * @offset: offset to the start of the imported bitmap
 * @bitmap: the bitmap to import
 * @flags: memory allocation flags
 *
 * Description:
 * Import the bitmap specified in @bitmap into @catmap, using the offset
 * in @offset.  The offset must be aligned to an unsigned long.  Returns zero
 * on success, negative values on failure.
 *
 */
int netlbl_catmap_setlong(struct netlbl_lsm_catmap **catmap,
			  u32 offset,
			  unsigned long bitmap,
			  gfp_t flags)
{
	struct netlbl_lsm_catmap *iter;
	u32 idx;

	/* only allow aligned offsets */
	if ((offset & (BITS_PER_LONG - 1)) != 0)
		return -EINVAL;

	iter = _netlbl_catmap_getnode(catmap, offset, _CM_F_ALLOC, flags);
	if (iter == NULL)
		return -ENOMEM;

	offset -= iter->startbit;
	idx = offset / NETLBL_CATMAP_MAPSIZE;
	iter->bitmap[idx] |= bitmap << (offset % NETLBL_CATMAP_MAPSIZE);

	return 0;
}

/* Bitmap functions
 */

/**
 * netlbl_bitmap_walk - Walk a bitmap looking for a bit
 * @bitmap: the bitmap
 * @bitmap_len: length in bits
 * @offset: starting offset
 * @state: if non-zero, look for a set (1) bit else look for a cleared (0) bit
 *
 * Description:
 * Starting at @offset, walk the bitmap from left to right until either the
 * desired bit is found or we reach the end.  Return the bit offset, -1 if
 * not found, or -2 if error.
 */
int netlbl_bitmap_walk(const unsigned char *bitmap, u32 bitmap_len,
		       u32 offset, u8 state)
{
	u32 bit_spot;
	u32 byte_offset;
	unsigned char bitmask;
	unsigned char byte;

	byte_offset = offset / 8;
	byte = bitmap[byte_offset];
	bit_spot = offset;
	bitmask = 0x80 >> (offset % 8);

	while (bit_spot < bitmap_len) {
		if ((state && (byte & bitmask) == bitmask) ||
		    (state == 0 && (byte & bitmask) == 0))
			return bit_spot;

		if (++bit_spot >= bitmap_len)
			return -1;
		bitmask >>= 1;
		if (bitmask == 0) {
			byte = bitmap[++byte_offset];
			bitmask = 0x80;
		}
	}

	return -1;
}
EXPORT_SYMBOL(netlbl_bitmap_walk);

/**
 * netlbl_bitmap_setbit - Sets a single bit in a bitmap
 * @bitmap: the bitmap
 * @bit: the bit
 * @state: if non-zero, set the bit (1) else clear the bit (0)
 *
 * Description:
 * Set a single bit in the bitmask.  Returns zero on success, negative values
 * on error.
 */
void netlbl_bitmap_setbit(unsigned char *bitmap, u32 bit, u8 state)
{
	u32 byte_spot;
	u8 bitmask;

	/* gcc always rounds to zero when doing integer division */
	byte_spot = bit / 8;
	bitmask = 0x80 >> (bit % 8);
	if (state)
		bitmap[byte_spot] |= bitmask;
	else
		bitmap[byte_spot] &= ~bitmask;
}
EXPORT_SYMBOL(netlbl_bitmap_setbit);

/*
 * LSM Functions
 */

/**
 * netlbl_enabled - Determine if the NetLabel subsystem is enabled
 *
 * Description:
 * The LSM can use this function to determine if it should use NetLabel
 * security attributes in it's enforcement mechanism.  Currently, NetLabel is
 * considered to be enabled when it's configuration contains a valid setup for
 * at least one labeled protocol (i.e. NetLabel can understand incoming
 * labeled packets of at least one type); otherwise NetLabel is considered to
 * be disabled.
 *
 */
int netlbl_enabled(void)
{
	/* At some point we probably want to expose this mechanism to the user
	 * as well so that admins can toggle NetLabel regardless of the
	 * configuration */
	return (atomic_read(&netlabel_mgmt_protocount) > 0);
}

/**
 * netlbl_sock_setattr - Label a socket using the correct protocol
 * @sk: the socket to label
 * @family: protocol family
 * @secattr: the security attributes
 *
 * Description:
 * Attach the correct label to the given socket using the security attributes
 * specified in @secattr.  This function requires exclusive access to @sk,
 * which means it either needs to be in the process of being created or locked.
 * Returns zero on success, -EDESTADDRREQ if the domain is configured to use
 * network address selectors (can't blindly label the socket), and negative
 * values on all other failures.
 *
 */
int netlbl_sock_setattr(struct sock *sk,
			u16 family,
			const struct netlbl_lsm_secattr *secattr)
{
	int ret_val;
	struct netlbl_dom_map *dom_entry;

	rcu_read_lock();
	dom_entry = netlbl_domhsh_getentry(secattr->domain, family);
	if (dom_entry == NULL) {
		ret_val = -ENOENT;
		goto socket_setattr_return;
	}
	switch (family) {
	case AF_INET:
		switch (dom_entry->def.type) {
		case NETLBL_NLTYPE_ADDRSELECT:
			ret_val = -EDESTADDRREQ;
			break;
		case NETLBL_NLTYPE_CIPSOV4:
			ret_val = cipso_v4_sock_setattr(sk,
							dom_entry->def.cipso,
							secattr);
			break;
		case NETLBL_NLTYPE_UNLABELED:
			ret_val = 0;
			break;
		default:
			ret_val = -ENOENT;
		}
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		switch (dom_entry->def.type) {
		case NETLBL_NLTYPE_ADDRSELECT:
			ret_val = -EDESTADDRREQ;
			break;
		case NETLBL_NLTYPE_CALIPSO:
			ret_val = calipso_sock_setattr(sk,
						       dom_entry->def.calipso,
						       secattr);
			break;
		case NETLBL_NLTYPE_UNLABELED:
			ret_val = 0;
			break;
		default:
			ret_val = -ENOENT;
		}
		break;
#endif /* IPv6 */
	default:
		ret_val = -EPROTONOSUPPORT;
	}

socket_setattr_return:
	rcu_read_unlock();
	return ret_val;
}

/**
 * netlbl_sock_delattr - Delete all the NetLabel labels on a socket
 * @sk: the socket
 *
 * Description:
 * Remove all the NetLabel labeling from @sk.  The caller is responsible for
 * ensuring that @sk is locked.
 *
 */
void netlbl_sock_delattr(struct sock *sk)
{
	switch (sk->sk_family) {
	case AF_INET:
		cipso_v4_sock_delattr(sk);
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		calipso_sock_delattr(sk);
		break;
#endif /* IPv6 */
	}
}

/**
 * netlbl_sock_getattr - Determine the security attributes of a sock
 * @sk: the sock
 * @secattr: the security attributes
 *
 * Description:
 * Examines the given sock to see if any NetLabel style labeling has been
 * applied to the sock, if so it parses the socket label and returns the
 * security attributes in @secattr.  Returns zero on success, negative values
 * on failure.
 *
 */
int netlbl_sock_getattr(struct sock *sk,
			struct netlbl_lsm_secattr *secattr)
{
	int ret_val;

	switch (sk->sk_family) {
	case AF_INET:
		ret_val = cipso_v4_sock_getattr(sk, secattr);
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		ret_val = calipso_sock_getattr(sk, secattr);
		break;
#endif /* IPv6 */
	default:
		ret_val = -EPROTONOSUPPORT;
	}

	return ret_val;
}

/**
 * netlbl_conn_setattr - Label a connected socket using the correct protocol
 * @sk: the socket to label
 * @addr: the destination address
 * @secattr: the security attributes
 *
 * Description:
 * Attach the correct label to the given connected socket using the security
 * attributes specified in @secattr.  The caller is responsible for ensuring
 * that @sk is locked.  Returns zero on success, negative values on failure.
 *
 */
int netlbl_conn_setattr(struct sock *sk,
			struct sockaddr *addr,
			const struct netlbl_lsm_secattr *secattr)
{
	int ret_val;
	struct sockaddr_in *addr4;
#if IS_ENABLED(CONFIG_IPV6)
	struct sockaddr_in6 *addr6;
#endif
	struct netlbl_dommap_def *entry;

	rcu_read_lock();
	switch (addr->sa_family) {
	case AF_INET:
		addr4 = (struct sockaddr_in *)addr;
		entry = netlbl_domhsh_getentry_af4(secattr->domain,
						   addr4->sin_addr.s_addr);
		if (entry == NULL) {
			ret_val = -ENOENT;
			goto conn_setattr_return;
		}
		switch (entry->type) {
		case NETLBL_NLTYPE_CIPSOV4:
			ret_val = cipso_v4_sock_setattr(sk,
							entry->cipso, secattr);
			break;
		case NETLBL_NLTYPE_UNLABELED:
			/* just delete the protocols we support for right now
			 * but we could remove other protocols if needed */
			netlbl_sock_delattr(sk);
			ret_val = 0;
			break;
		default:
			ret_val = -ENOENT;
		}
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		addr6 = (struct sockaddr_in6 *)addr;
		entry = netlbl_domhsh_getentry_af6(secattr->domain,
						   &addr6->sin6_addr);
		if (entry == NULL) {
			ret_val = -ENOENT;
			goto conn_setattr_return;
		}
		switch (entry->type) {
		case NETLBL_NLTYPE_CALIPSO:
			ret_val = calipso_sock_setattr(sk,
						       entry->calipso, secattr);
			break;
		case NETLBL_NLTYPE_UNLABELED:
			/* just delete the protocols we support for right now
			 * but we could remove other protocols if needed */
			netlbl_sock_delattr(sk);
			ret_val = 0;
			break;
		default:
			ret_val = -ENOENT;
		}
		break;
#endif /* IPv6 */
	default:
		ret_val = -EPROTONOSUPPORT;
	}

conn_setattr_return:
	rcu_read_unlock();
	return ret_val;
}

/**
 * netlbl_req_setattr - Label a request socket using the correct protocol
 * @req: the request socket to label
 * @secattr: the security attributes
 *
 * Description:
 * Attach the correct label to the given socket using the security attributes
 * specified in @secattr.  Returns zero on success, negative values on failure.
 *
 */
int netlbl_req_setattr(struct request_sock *req,
		       const struct netlbl_lsm_secattr *secattr)
{
	int ret_val;
	struct netlbl_dommap_def *entry;
	struct inet_request_sock *ireq = inet_rsk(req);

	rcu_read_lock();
	switch (req->rsk_ops->family) {
	case AF_INET:
		entry = netlbl_domhsh_getentry_af4(secattr->domain,
						   ireq->ir_rmt_addr);
		if (entry == NULL) {
			ret_val = -ENOENT;
			goto req_setattr_return;
		}
		switch (entry->type) {
		case NETLBL_NLTYPE_CIPSOV4:
			ret_val = cipso_v4_req_setattr(req,
						       entry->cipso, secattr);
			break;
		case NETLBL_NLTYPE_UNLABELED:
			netlbl_req_delattr(req);
			ret_val = 0;
			break;
		default:
			ret_val = -ENOENT;
		}
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		entry = netlbl_domhsh_getentry_af6(secattr->domain,
						   &ireq->ir_v6_rmt_addr);
		if (entry == NULL) {
			ret_val = -ENOENT;
			goto req_setattr_return;
		}
		switch (entry->type) {
		case NETLBL_NLTYPE_CALIPSO:
			ret_val = calipso_req_setattr(req,
						      entry->calipso, secattr);
			break;
		case NETLBL_NLTYPE_UNLABELED:
			netlbl_req_delattr(req);
			ret_val = 0;
			break;
		default:
			ret_val = -ENOENT;
		}
		break;
#endif /* IPv6 */
	default:
		ret_val = -EPROTONOSUPPORT;
	}

req_setattr_return:
	rcu_read_unlock();
	return ret_val;
}

/**
* netlbl_req_delattr - Delete all the NetLabel labels on a socket
* @req: the socket
*
* Description:
* Remove all the NetLabel labeling from @req.
*
*/
void netlbl_req_delattr(struct request_sock *req)
{
	switch (req->rsk_ops->family) {
	case AF_INET:
		cipso_v4_req_delattr(req);
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		calipso_req_delattr(req);
		break;
#endif /* IPv6 */
	}
}

/**
 * netlbl_skbuff_setattr - Label a packet using the correct protocol
 * @skb: the packet
 * @family: protocol family
 * @secattr: the security attributes
 *
 * Description:
 * Attach the correct label to the given packet using the security attributes
 * specified in @secattr.  Returns zero on success, negative values on failure.
 *
 */
int netlbl_skbuff_setattr(struct sk_buff *skb,
			  u16 family,
			  const struct netlbl_lsm_secattr *secattr)
{
	int ret_val;
	struct iphdr *hdr4;
#if IS_ENABLED(CONFIG_IPV6)
	struct ipv6hdr *hdr6;
#endif
	struct netlbl_dommap_def *entry;

	rcu_read_lock();
	switch (family) {
	case AF_INET:
		hdr4 = ip_hdr(skb);
		entry = netlbl_domhsh_getentry_af4(secattr->domain,
						   hdr4->daddr);
		if (entry == NULL) {
			ret_val = -ENOENT;
			goto skbuff_setattr_return;
		}
		switch (entry->type) {
		case NETLBL_NLTYPE_CIPSOV4:
			ret_val = cipso_v4_skbuff_setattr(skb, entry->cipso,
							  secattr);
			break;
		case NETLBL_NLTYPE_UNLABELED:
			/* just delete the protocols we support for right now
			 * but we could remove other protocols if needed */
			ret_val = cipso_v4_skbuff_delattr(skb);
			break;
		default:
			ret_val = -ENOENT;
		}
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		hdr6 = ipv6_hdr(skb);
		entry = netlbl_domhsh_getentry_af6(secattr->domain,
						   &hdr6->daddr);
		if (entry == NULL) {
			ret_val = -ENOENT;
			goto skbuff_setattr_return;
		}
		switch (entry->type) {
		case NETLBL_NLTYPE_CALIPSO:
			ret_val = calipso_skbuff_setattr(skb, entry->calipso,
							 secattr);
			break;
		case NETLBL_NLTYPE_UNLABELED:
			/* just delete the protocols we support for right now
			 * but we could remove other protocols if needed */
			ret_val = calipso_skbuff_delattr(skb);
			break;
		default:
			ret_val = -ENOENT;
		}
		break;
#endif /* IPv6 */
	default:
		ret_val = -EPROTONOSUPPORT;
	}

skbuff_setattr_return:
	rcu_read_unlock();
	return ret_val;
}

/**
 * netlbl_skbuff_getattr - Determine the security attributes of a packet
 * @skb: the packet
 * @family: protocol family
 * @secattr: the security attributes
 *
 * Description:
 * Examines the given packet to see if a recognized form of packet labeling
 * is present, if so it parses the packet label and returns the security
 * attributes in @secattr.  Returns zero on success, negative values on
 * failure.
 *
 */
int netlbl_skbuff_getattr(const struct sk_buff *skb,
			  u16 family,
			  struct netlbl_lsm_secattr *secattr)
{
	unsigned char *ptr;

	switch (family) {
	case AF_INET:
		ptr = cipso_v4_optptr(skb);
		if (ptr && cipso_v4_getattr(ptr, secattr) == 0)
			return 0;
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		ptr = calipso_optptr(skb);
		if (ptr && calipso_getattr(ptr, secattr) == 0)
			return 0;
		break;
#endif /* IPv6 */
	}

	return netlbl_unlabel_getattr(skb, family, secattr);
}

/**
 * netlbl_skbuff_err - Handle a LSM error on a sk_buff
 * @skb: the packet
 * @family: the family
 * @error: the error code
 * @gateway: true if host is acting as a gateway, false otherwise
 *
 * Description:
 * Deal with a LSM problem when handling the packet in @skb, typically this is
 * a permission denied problem (-EACCES).  The correct action is determined
 * according to the packet's labeling protocol.
 *
 */
void netlbl_skbuff_err(struct sk_buff *skb, u16 family, int error, int gateway)
{
	switch (family) {
	case AF_INET:
		if (cipso_v4_optptr(skb))
			cipso_v4_error(skb, error, gateway);
		break;
	}
}

/**
 * netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
 *
 * Description:
 * For all of the NetLabel protocols that support some form of label mapping
 * cache, invalidate the cache.  Returns zero on success, negative values on
 * error.
 *
 */
void netlbl_cache_invalidate(void)
{
	cipso_v4_cache_invalidate();
#if IS_ENABLED(CONFIG_IPV6)
	calipso_cache_invalidate();
#endif /* IPv6 */
}

/**
 * netlbl_cache_add - Add an entry to a NetLabel protocol cache
 * @skb: the packet
 * @family: the family
 * @secattr: the packet's security attributes
 *
 * Description:
 * Add the LSM security attributes for the given packet to the underlying
 * NetLabel protocol's label mapping cache.  Returns zero on success, negative
 * values on error.
 *
 */
int netlbl_cache_add(const struct sk_buff *skb, u16 family,
		     const struct netlbl_lsm_secattr *secattr)
{
	unsigned char *ptr;

	if ((secattr->flags & NETLBL_SECATTR_CACHE) == 0)
		return -ENOMSG;

	switch (family) {
	case AF_INET:
		ptr = cipso_v4_optptr(skb);
		if (ptr)
			return cipso_v4_cache_add(ptr, secattr);
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		ptr = calipso_optptr(skb);
		if (ptr)
			return calipso_cache_add(ptr, secattr);
		break;
#endif /* IPv6 */
	}
	return -ENOMSG;
}

/*
 * Protocol Engine Functions
 */

/**
 * netlbl_audit_start - Start an audit message
 * @type: audit message type
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Start an audit message using the type specified in @type and fill the audit
 * message with some fields common to all NetLabel audit messages.  This
 * function should only be used by protocol engines, not LSMs.  Returns a
 * pointer to the audit buffer on success, NULL on failure.
 *
 */
struct audit_buffer *netlbl_audit_start(int type,
					struct netlbl_audit *audit_info)
{
	return netlbl_audit_start_common(type, audit_info);
}
EXPORT_SYMBOL(netlbl_audit_start);

/*
 * Setup Functions
 */

/**
 * netlbl_init - Initialize NetLabel
 *
 * Description:
 * Perform the required NetLabel initialization before first use.
 *
 */
static int __init netlbl_init(void)
{
	int ret_val;

	printk(KERN_INFO "NetLabel: Initializing\n");
	printk(KERN_INFO "NetLabel:  domain hash size = %u\n",
	       (1 << NETLBL_DOMHSH_BITSIZE));
	printk(KERN_INFO "NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO\n");

	ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
	if (ret_val != 0)
		goto init_failure;

	ret_val = netlbl_unlabel_init(NETLBL_UNLHSH_BITSIZE);
	if (ret_val != 0)
		goto init_failure;

	ret_val = netlbl_netlink_init();
	if (ret_val != 0)
		goto init_failure;

	ret_val = netlbl_unlabel_defconf();
	if (ret_val != 0)
		goto init_failure;
	printk(KERN_INFO "NetLabel:  unlabeled traffic allowed by default\n");

	return 0;

init_failure:
	panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
}

subsys_initcall(netlbl_init);