summaryrefslogtreecommitdiffstats
path: root/fs/cifs/fs_context.c
blob: 892f51a21278beed2e6cfd590b234c65134254a1 (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
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) 2020, Microsoft Corporation.
 *
 *   Author(s): Steve French <stfrench@microsoft.com>
 *              David Howells <dhowells@redhat.com>
 */

/*
#include <linux/module.h>
#include <linux/nsproxy.h>
#include <linux/slab.h>
#include <linux/magic.h>
#include <linux/security.h>
#include <net/net_namespace.h>
*/

#include <linux/ctype.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/parser.h>
#include <linux/utsname.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "ntlmssp.h"
#include "nterr.h"
#include "rfc1002pdu.h"
#include "fs_context.h"

static const match_table_t cifs_smb_version_tokens = {
	{ Smb_1, SMB1_VERSION_STRING },
	{ Smb_20, SMB20_VERSION_STRING},
	{ Smb_21, SMB21_VERSION_STRING },
	{ Smb_30, SMB30_VERSION_STRING },
	{ Smb_302, SMB302_VERSION_STRING },
	{ Smb_302, ALT_SMB302_VERSION_STRING },
	{ Smb_311, SMB311_VERSION_STRING },
	{ Smb_311, ALT_SMB311_VERSION_STRING },
	{ Smb_3any, SMB3ANY_VERSION_STRING },
	{ Smb_default, SMBDEFAULT_VERSION_STRING },
	{ Smb_version_err, NULL }
};

static const match_table_t cifs_secflavor_tokens = {
	{ Opt_sec_krb5, "krb5" },
	{ Opt_sec_krb5i, "krb5i" },
	{ Opt_sec_krb5p, "krb5p" },
	{ Opt_sec_ntlmsspi, "ntlmsspi" },
	{ Opt_sec_ntlmssp, "ntlmssp" },
	{ Opt_ntlm, "ntlm" },
	{ Opt_sec_ntlmi, "ntlmi" },
	{ Opt_sec_ntlmv2, "nontlm" },
	{ Opt_sec_ntlmv2, "ntlmv2" },
	{ Opt_sec_ntlmv2i, "ntlmv2i" },
	{ Opt_sec_lanman, "lanman" },
	{ Opt_sec_none, "none" },

	{ Opt_sec_err, NULL }
};

const struct fs_parameter_spec smb3_fs_parameters[] = {
	/* Mount options that take no arguments */
	fsparam_flag_no("user_xattr", Opt_user_xattr),
	fsparam_flag_no("forceuid", Opt_forceuid),
	fsparam_flag_no("multichannel", Opt_multichannel),
	fsparam_flag_no("forcegid", Opt_forcegid),
	fsparam_flag("noblocksend", Opt_noblocksend),
	fsparam_flag("noautotune", Opt_noautotune),
	fsparam_flag("nolease", Opt_nolease),
	fsparam_flag_no("hard", Opt_hard),
	fsparam_flag_no("soft", Opt_soft),
	fsparam_flag_no("perm", Opt_perm),
	fsparam_flag("nodelete", Opt_nodelete),
	fsparam_flag_no("mapposix", Opt_mapposix),
	fsparam_flag("mapchars", Opt_mapchars),
	fsparam_flag("nomapchars", Opt_nomapchars),
	fsparam_flag_no("sfu", Opt_sfu),
	fsparam_flag("nodfs", Opt_nodfs),
	fsparam_flag_no("posixpaths", Opt_posixpaths),
	fsparam_flag_no("unix", Opt_unix),
	fsparam_flag_no("linux", Opt_unix),
	fsparam_flag_no("posix", Opt_unix),
	fsparam_flag("nocase", Opt_nocase),
	fsparam_flag("ignorecase", Opt_nocase),
	fsparam_flag_no("brl", Opt_brl),
	fsparam_flag_no("handlecache", Opt_handlecache),
	fsparam_flag("forcemandatorylock", Opt_forcemandatorylock),
	fsparam_flag("forcemand", Opt_forcemandatorylock),
	fsparam_flag("setuidfromacl", Opt_setuidfromacl),
	fsparam_flag("idsfromsid", Opt_setuidfromacl),
	fsparam_flag_no("setuids", Opt_setuids),
	fsparam_flag_no("dynperm", Opt_dynperm),
	fsparam_flag_no("intr", Opt_intr),
	fsparam_flag_no("strictsync", Opt_strictsync),
	fsparam_flag_no("serverino", Opt_serverino),
	fsparam_flag("rwpidforward", Opt_rwpidforward),
	fsparam_flag("cifsacl", Opt_cifsacl),
	fsparam_flag_no("acl", Opt_acl),
	fsparam_flag("locallease", Opt_locallease),
	fsparam_flag("sign", Opt_sign),
	fsparam_flag("ignore_signature", Opt_ignore_signature),
	fsparam_flag("signloosely", Opt_ignore_signature),
	fsparam_flag("seal", Opt_seal),
	fsparam_flag("noac", Opt_noac),
	fsparam_flag("fsc", Opt_fsc),
	fsparam_flag("mfsymlinks", Opt_mfsymlinks),
	fsparam_flag("multiuser", Opt_multiuser),
	fsparam_flag("sloppy", Opt_sloppy),
	fsparam_flag("nosharesock", Opt_nosharesock),
	fsparam_flag_no("persistenthandles", Opt_persistent),
	fsparam_flag_no("resilienthandles", Opt_resilient),
	fsparam_flag("domainauto", Opt_domainauto),
	fsparam_flag("rdma", Opt_rdma),
	fsparam_flag("modesid", Opt_modesid),
	fsparam_flag("modefromsid", Opt_modesid),
	fsparam_flag("rootfs", Opt_rootfs),
	fsparam_flag("compress", Opt_compress),
	fsparam_flag("witness", Opt_witness),

	/* Mount options which take numeric value */
	fsparam_u32("backupuid", Opt_backupuid),
	fsparam_u32("backupgid", Opt_backupgid),
	fsparam_u32("uid", Opt_uid),
	fsparam_u32("cruid", Opt_cruid),
	fsparam_u32("gid", Opt_gid),
	fsparam_u32("file_mode", Opt_file_mode),
	fsparam_u32("dirmode", Opt_dirmode),
	fsparam_u32("dir_mode", Opt_dirmode),
	fsparam_u32("port", Opt_port),
	fsparam_u32("min_enc_offload", Opt_min_enc_offload),
	fsparam_u32("esize", Opt_min_enc_offload),
	fsparam_u32("bsize", Opt_blocksize),
	fsparam_u32("rsize", Opt_rsize),
	fsparam_u32("wsize", Opt_wsize),
	fsparam_u32("actimeo", Opt_actimeo),
	fsparam_u32("acdirmax", Opt_acdirmax),
	fsparam_u32("acregmax", Opt_acregmax),
	fsparam_u32("echo_interval", Opt_echo_interval),
	fsparam_u32("max_credits", Opt_max_credits),
	fsparam_u32("handletimeout", Opt_handletimeout),
	fsparam_u32("snapshot", Opt_snapshot),
	fsparam_u32("max_channels", Opt_max_channels),

	/* Mount options which take string value */
	fsparam_string("source", Opt_source),
	fsparam_string("user", Opt_user),
	fsparam_string("username", Opt_user),
	fsparam_string("pass", Opt_pass),
	fsparam_string("password", Opt_pass),
	fsparam_string("ip", Opt_ip),
	fsparam_string("addr", Opt_ip),
	fsparam_string("domain", Opt_domain),
	fsparam_string("dom", Opt_domain),
	fsparam_string("srcaddr", Opt_srcaddr),
	fsparam_string("iocharset", Opt_iocharset),
	fsparam_string("netbiosname", Opt_netbiosname),
	fsparam_string("servern", Opt_servern),
	fsparam_string("ver", Opt_ver),
	fsparam_string("vers", Opt_vers),
	fsparam_string("sec", Opt_sec),
	fsparam_string("cache", Opt_cache),

	/* Arguments that should be ignored */
	fsparam_flag("guest", Opt_ignore),
	fsparam_flag("noatime", Opt_ignore),
	fsparam_flag("relatime", Opt_ignore),
	fsparam_flag("_netdev", Opt_ignore),
	fsparam_flag_no("suid", Opt_ignore),
	fsparam_flag_no("exec", Opt_ignore),
	fsparam_flag_no("dev", Opt_ignore),
	fsparam_flag_no("mand", Opt_ignore),
	fsparam_flag_no("auto", Opt_ignore),
	fsparam_string("cred", Opt_ignore),
	fsparam_string("credentials", Opt_ignore),
	/*
	 * UNC and prefixpath is now extracted from Opt_source
	 * in the new mount API so we can just ignore them going forward.
	 */
	fsparam_string("unc", Opt_ignore),
	fsparam_string("prefixpath", Opt_ignore),
	{}
};

int
cifs_parse_security_flavors(char *value, struct smb3_fs_context *ctx)
{

	substring_t args[MAX_OPT_ARGS];

	/*
	 * With mount options, the last one should win. Reset any existing
	 * settings back to default.
	 */
	ctx->sectype = Unspecified;
	ctx->sign = false;

	switch (match_token(value, cifs_secflavor_tokens, args)) {
	case Opt_sec_krb5p:
		cifs_dbg(VFS, "sec=krb5p is not supported!\n");
		return 1;
	case Opt_sec_krb5i:
		ctx->sign = true;
		fallthrough;
	case Opt_sec_krb5:
		ctx->sectype = Kerberos;
		break;
	case Opt_sec_ntlmsspi:
		ctx->sign = true;
		fallthrough;
	case Opt_sec_ntlmssp:
		ctx->sectype = RawNTLMSSP;
		break;
	case Opt_sec_ntlmi:
		ctx->sign = true;
		fallthrough;
	case Opt_ntlm:
		ctx->sectype = NTLM;
		break;
	case Opt_sec_ntlmv2i:
		ctx->sign = true;
		fallthrough;
	case Opt_sec_ntlmv2:
		ctx->sectype = NTLMv2;
		break;
#ifdef CONFIG_CIFS_WEAK_PW_HASH
	case Opt_sec_lanman:
		ctx->sectype = LANMAN;
		break;
#endif
	case Opt_sec_none:
		ctx->nullauth = 1;
		break;
	default:
		cifs_dbg(VFS, "bad security option: %s\n", value);
		return 1;
	}

	return 0;
}

static const match_table_t cifs_cacheflavor_tokens = {
	{ Opt_cache_loose, "loose" },
	{ Opt_cache_strict, "strict" },
	{ Opt_cache_none, "none" },
	{ Opt_cache_ro, "ro" },
	{ Opt_cache_rw, "singleclient" },
	{ Opt_cache_err, NULL }
};

int
cifs_parse_cache_flavor(char *value, struct smb3_fs_context *ctx)
{
	substring_t args[MAX_OPT_ARGS];

	switch (match_token(value, cifs_cacheflavor_tokens, args)) {
	case Opt_cache_loose:
		ctx->direct_io = false;
		ctx->strict_io = false;
		ctx->cache_ro = false;
		ctx->cache_rw = false;
		break;
	case Opt_cache_strict:
		ctx->direct_io = false;
		ctx->strict_io = true;
		ctx->cache_ro = false;
		ctx->cache_rw = false;
		break;
	case Opt_cache_none:
		ctx->direct_io = true;
		ctx->strict_io = false;
		ctx->cache_ro = false;
		ctx->cache_rw = false;
		break;
	case Opt_cache_ro:
		ctx->direct_io = false;
		ctx->strict_io = false;
		ctx->cache_ro = true;
		ctx->cache_rw = false;
		break;
	case Opt_cache_rw:
		ctx->direct_io = false;
		ctx->strict_io = false;
		ctx->cache_ro = false;
		ctx->cache_rw = true;
		break;
	default:
		cifs_dbg(VFS, "bad cache= option: %s\n", value);
		return 1;
	}
	return 0;
}

#define DUP_CTX_STR(field)						\
do {									\
	if (ctx->field) {						\
		new_ctx->field = kstrdup(ctx->field, GFP_ATOMIC);	\
		if (new_ctx->field == NULL) {				\
			smb3_cleanup_fs_context_contents(new_ctx);	\
			return -ENOMEM;					\
		}							\
	}								\
} while (0)

int
smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx)
{
	memcpy(new_ctx, ctx, sizeof(*ctx));
	new_ctx->prepath = NULL;
	new_ctx->mount_options = NULL;
	new_ctx->nodename = NULL;
	new_ctx->username = NULL;
	new_ctx->password = NULL;
	new_ctx->domainname = NULL;
	new_ctx->UNC = NULL;
	new_ctx->source = NULL;
	new_ctx->iocharset = NULL;

	/*
	 * Make sure to stay in sync with smb3_cleanup_fs_context_contents()
	 */
	DUP_CTX_STR(prepath);
	DUP_CTX_STR(mount_options);
	DUP_CTX_STR(username);
	DUP_CTX_STR(password);
	DUP_CTX_STR(UNC);
	DUP_CTX_STR(source);
	DUP_CTX_STR(domainname);
	DUP_CTX_STR(nodename);
	DUP_CTX_STR(iocharset);

	return 0;
}

static int
cifs_parse_smb_version(char *value, struct smb3_fs_context *ctx, bool is_smb3)
{
	substring_t args[MAX_OPT_ARGS];

	switch (match_token(value, cifs_smb_version_tokens, args)) {
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
	case Smb_1:
		if (disable_legacy_dialects) {
			cifs_dbg(VFS, "mount with legacy dialect disabled\n");
			return 1;
		}
		if (is_smb3) {
			cifs_dbg(VFS, "vers=1.0 (cifs) not permitted when mounting with smb3\n");
			return 1;
		}
		cifs_dbg(VFS, "Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers\n");
		ctx->ops = &smb1_operations;
		ctx->vals = &smb1_values;
		break;
	case Smb_20:
		if (disable_legacy_dialects) {
			cifs_dbg(VFS, "mount with legacy dialect disabled\n");
			return 1;
		}
		if (is_smb3) {
			cifs_dbg(VFS, "vers=2.0 not permitted when mounting with smb3\n");
			return 1;
		}
		ctx->ops = &smb20_operations;
		ctx->vals = &smb20_values;
		break;
#else
	case Smb_1:
		cifs_dbg(VFS, "vers=1.0 (cifs) mount not permitted when legacy dialects disabled\n");
		return 1;
	case Smb_20:
		cifs_dbg(VFS, "vers=2.0 mount not permitted when legacy dialects disabled\n");
		return 1;
#endif /* CIFS_ALLOW_INSECURE_LEGACY */
	case Smb_21:
		ctx->ops = &smb21_operations;
		ctx->vals = &smb21_values;
		break;
	case Smb_30:
		ctx->ops = &smb30_operations;
		ctx->vals = &smb30_values;
		break;
	case Smb_302:
		ctx->ops = &smb30_operations; /* currently identical with 3.0 */
		ctx->vals = &smb302_values;
		break;
	case Smb_311:
		ctx->ops = &smb311_operations;
		ctx->vals = &smb311_values;
		break;
	case Smb_3any:
		ctx->ops = &smb30_operations; /* currently identical with 3.0 */
		ctx->vals = &smb3any_values;
		break;
	case Smb_default:
		ctx->ops = &smb30_operations;
		ctx->vals = &smbdefault_values;
		break;
	default:
		cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
		return 1;
	}
	return 0;
}

int smb3_parse_opt(const char *options, const char *key, char **val)
{
	int rc = -ENOENT;
	char *opts, *orig, *p;

	orig = opts = kstrdup(options, GFP_KERNEL);
	if (!opts)
		return -ENOMEM;

	while ((p = strsep(&opts, ","))) {
		char *nval;

		if (!*p)
			continue;
		if (strncasecmp(p, key, strlen(key)))
			continue;
		nval = strchr(p, '=');
		if (nval) {
			if (nval == p)
				continue;
			*nval++ = 0;
			*val = kstrndup(nval, strlen(nval), GFP_KERNEL);
			rc = !*val ? -ENOMEM : 0;
			goto out;
		}
	}
out:
	kfree(orig);
	return rc;
}

/*
 * Parse a devname into substrings and populate the ctx->UNC and ctx->prepath
 * fields with the result. Returns 0 on success and an error otherwise
 * (e.g. ENOMEM or EINVAL)
 */
int
smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx)
{
	char *pos;
	const char *delims = "/\\";
	size_t len;

	if (unlikely(!devname || !*devname)) {
		cifs_dbg(VFS, "Device name not specified\n");
		return -EINVAL;
	}

	/* make sure we have a valid UNC double delimiter prefix */
	len = strspn(devname, delims);
	if (len != 2)
		return -EINVAL;

	/* find delimiter between host and sharename */
	pos = strpbrk(devname + 2, delims);
	if (!pos)
		return -EINVAL;

	/* skip past delimiter */
	++pos;

	/* now go until next delimiter or end of string */
	len = strcspn(pos, delims);

	/* move "pos" up to delimiter or NULL */
	pos += len;
	ctx->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
	if (!ctx->UNC)
		return -ENOMEM;

	convert_delimiter(ctx->UNC, '\\');

	/* skip any delimiter */
	if (*pos == '/' || *pos == '\\')
		pos++;

	/* If pos is NULL then no prepath */
	if (!*pos)
		return 0;

	ctx->prepath = kstrdup(pos, GFP_KERNEL);
	if (!ctx->prepath)
		return -ENOMEM;

	return 0;
}

static void smb3_fs_context_free(struct fs_context *fc);
static int smb3_fs_context_parse_param(struct fs_context *fc,
				       struct fs_parameter *param);
static int smb3_fs_context_parse_monolithic(struct fs_context *fc,
					    void *data);
static int smb3_get_tree(struct fs_context *fc);
static int smb3_reconfigure(struct fs_context *fc);

static const struct fs_context_operations smb3_fs_context_ops = {
	.free			= smb3_fs_context_free,
	.parse_param		= smb3_fs_context_parse_param,
	.parse_monolithic	= smb3_fs_context_parse_monolithic,
	.get_tree		= smb3_get_tree,
	.reconfigure		= smb3_reconfigure,
};

/*
 * Parse a monolithic block of data from sys_mount().
 * smb3_fs_context_parse_monolithic - Parse key[=val][,key[=val]]* mount data
 * @ctx: The superblock configuration to fill in.
 * @data: The data to parse
 *
 * Parse a blob of data that's in key[=val][,key[=val]]* form.  This can be
 * called from the ->monolithic_mount_data() fs_context operation.
 *
 * Returns 0 on success or the error returned by the ->parse_option() fs_context
 * operation on failure.
 */
static int smb3_fs_context_parse_monolithic(struct fs_context *fc,
					   void *data)
{
	struct smb3_fs_context *ctx = smb3_fc2context(fc);
	char *options = data, *key;
	int ret = 0;

	if (!options)
		return 0;

	ctx->mount_options = kstrdup(data, GFP_KERNEL);
	if (ctx->mount_options == NULL)
		return -ENOMEM;

	ret = security_sb_eat_lsm_opts(options, &fc->security);
	if (ret)
		return ret;

	/* BB Need to add support for sep= here TBD */
	while ((key = strsep(&options, ",")) != NULL) {
		size_t len;
		char *value;

		if (*key == 0)
			break;

		/* Check if following character is the deliminator If yes,
		 * we have encountered a double deliminator reset the NULL
		 * character to the deliminator
		 */
		while (options && options[0] == ',') {
			len = strlen(key);
			strcpy(key + len, options);
			options = strchr(options, ',');
			if (options)
				*options++ = 0;
		}


		len = 0;
		value = strchr(key, '=');
		if (value) {
			if (value == key)
				continue;
			*value++ = 0;
			len = strlen(value);
		}

		ret = vfs_parse_fs_string(fc, key, value, len);
		if (ret < 0)
			break;
	}

	return ret;
}

/*
 * Validate the preparsed information in the config.
 */
static int smb3_fs_context_validate(struct fs_context *fc)
{
	struct smb3_fs_context *ctx = smb3_fc2context(fc);

	if (ctx->rdma && ctx->vals->protocol_id < SMB30_PROT_ID) {
		cifs_dbg(VFS, "SMB Direct requires Version >=3.0\n");
		return -EOPNOTSUPP;
	}

#ifndef CONFIG_KEYS
	/* Muliuser mounts require CONFIG_KEYS support */
	if (ctx->multiuser) {
		cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
		return -1;
	}
#endif

	if (ctx->got_version == false)
		pr_warn_once("No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3.1.1), from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3.1.1 (or even SMB3 or SMB2.1) specify vers=1.0 on mount.\n");


	if (!ctx->UNC) {
		cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
		return -1;
	}

	/* make sure UNC has a share name */
	if (strlen(ctx->UNC) < 3 || !strchr(ctx->UNC + 3, '\\')) {
		cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
		return -ENOENT;
	}

	if (!ctx->got_ip) {
		int len;
		const char *slash;

		/* No ip= option specified? Try to get it from UNC */
		/* Use the address part of the UNC. */
		slash = strchr(&ctx->UNC[2], '\\');
		len = slash - &ctx->UNC[2];
		if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr,
					  &ctx->UNC[2], len)) {
			pr_err("Unable to determine destination address\n");
			return -EHOSTUNREACH;
		}
	}

	/* set the port that we got earlier */
	cifs_set_port((struct sockaddr *)&ctx->dstaddr, ctx->port);

	if (ctx->override_uid && !ctx->uid_specified) {
		ctx->override_uid = 0;
		pr_notice("ignoring forceuid mount option specified with no uid= option\n");
	}

	if (ctx->override_gid && !ctx->gid_specified) {
		ctx->override_gid = 0;
		pr_notice("ignoring forcegid mount option specified with no gid= option\n");
	}

	return 0;
}

static int smb3_get_tree_common(struct fs_context *fc)
{
	struct smb3_fs_context *ctx = smb3_fc2context(fc);
	struct dentry *root;
	int rc = 0;

	root = cifs_smb3_do_mount(fc->fs_type, 0, ctx);
	if (IS_ERR(root))
		return PTR_ERR(root);

	fc->root = root;

	return rc;
}

/*
 * Create an SMB3 superblock from the parameters passed.
 */
static int smb3_get_tree(struct fs_context *fc)
{
	int err = smb3_fs_context_validate(fc);

	if (err)
		return err;
	return smb3_get_tree_common(fc);
}

static void smb3_fs_context_free(struct fs_context *fc)
{
	struct smb3_fs_context *ctx = smb3_fc2context(fc);

	smb3_cleanup_fs_context(ctx);
}

/*
 * Compare the old and new proposed context during reconfigure
 * and check if the changes are compatible.
 */
static int smb3_verify_reconfigure_ctx(struct smb3_fs_context *new_ctx,
				       struct smb3_fs_context *old_ctx)
{
	if (new_ctx->posix_paths != old_ctx->posix_paths) {
		cifs_dbg(VFS, "can not change posixpaths during remount\n");
		return -EINVAL;
	}
	if (new_ctx->sectype != old_ctx->sectype) {
		cifs_dbg(VFS, "can not change sec during remount\n");
		return -EINVAL;
	}
	if (new_ctx->multiuser != old_ctx->multiuser) {
		cifs_dbg(VFS, "can not change multiuser during remount\n");
		return -EINVAL;
	}
	if (new_ctx->UNC &&
	    (!old_ctx->UNC || strcmp(new_ctx->UNC, old_ctx->UNC))) {
		cifs_dbg(VFS, "can not change UNC during remount\n");
		return -EINVAL;
	}
	if (new_ctx->username &&
	    (!old_ctx->username || strcmp(new_ctx->username, old_ctx->username))) {
		cifs_dbg(VFS, "can not change username during remount\n");
		return -EINVAL;
	}
	if (new_ctx->password &&
	    (!old_ctx->password || strcmp(new_ctx->password, old_ctx->password))) {
		cifs_dbg(VFS, "can not change password during remount\n");
		return -EINVAL;
	}
	if (new_ctx->domainname &&
	    (!old_ctx->domainname || strcmp(new_ctx->domainname, old_ctx->domainname))) {
		cifs_dbg(VFS, "can not change domainname during remount\n");
		return -EINVAL;
	}
	if (new_ctx->nodename &&
	    (!old_ctx->nodename || strcmp(new_ctx->nodename, old_ctx->nodename))) {
		cifs_dbg(VFS, "can not change nodename during remount\n");
		return -EINVAL;
	}
	if (new_ctx->iocharset &&
	    (!old_ctx->iocharset || strcmp(new_ctx->iocharset, old_ctx->iocharset))) {
		cifs_dbg(VFS, "can not change iocharset during remount\n");
		return -EINVAL;
	}

	return 0;
}

#define STEAL_STRING(cifs_sb, ctx, field)				\
do {									\
	kfree(ctx->field);						\
	ctx->field = cifs_sb->ctx->field;				\
	cifs_sb->ctx->field = NULL;					\
} while (0)

static int smb3_reconfigure(struct fs_context *fc)
{
	struct smb3_fs_context *ctx = smb3_fc2context(fc);
	struct dentry *root = fc->root;
	struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
	int rc;

	rc = smb3_verify_reconfigure_ctx(ctx, cifs_sb->ctx);
	if (rc)
		return rc;

	/*
	 * We can not change UNC/username/password/domainname/nodename/iocharset
	 * during reconnect so ignore what we have in the new context and
	 * just use what we already have in cifs_sb->ctx.
	 */
	STEAL_STRING(cifs_sb, ctx, UNC);
	STEAL_STRING(cifs_sb, ctx, source);
	STEAL_STRING(cifs_sb, ctx, username);
	STEAL_STRING(cifs_sb, ctx, password);
	STEAL_STRING(cifs_sb, ctx, domainname);
	STEAL_STRING(cifs_sb, ctx, nodename);
	STEAL_STRING(cifs_sb, ctx, iocharset);

	/* if rsize or wsize not passed in on remount, use previous values */
	if (ctx->rsize == 0)
		ctx->rsize = cifs_sb->ctx->rsize;
	if (ctx->wsize == 0)
		ctx->wsize = cifs_sb->ctx->wsize;


	smb3_cleanup_fs_context_contents(cifs_sb->ctx);
	rc = smb3_fs_context_dup(cifs_sb->ctx, ctx);
	smb3_update_mnt_flags(cifs_sb);

	return rc;
}

static int smb3_fs_context_parse_param(struct fs_context *fc,
				      struct fs_parameter *param)
{
	struct fs_parse_result result;
	struct smb3_fs_context *ctx = smb3_fc2context(fc);
	int i, opt;
	bool is_smb3 = !strcmp(fc->fs_type->name, "smb3");
	bool skip_parsing = false;

	cifs_dbg(FYI, "CIFS: parsing cifs mount option '%s'\n", param->key);

	/*
	 * fs_parse can not handle string options with an empty value so
	 * we will need special handling of them.
	 */
	if (param->type == fs_value_is_string && param->string[0] == 0) {
		if (!strcmp("pass", param->key) || !strcmp("password", param->key)) {
			skip_parsing = true;
			opt = Opt_pass;
		} else if (!strcmp("user", param->key) || !strcmp("username", param->key)) {
			skip_parsing = true;
			opt = Opt_user;
		}
	}

	if (!skip_parsing) {
		opt = fs_parse(fc, smb3_fs_parameters, param, &result);
		if (opt < 0)
			return ctx->sloppy ? 1 : opt;
	}

	switch (opt) {
	case Opt_compress:
		ctx->compression = UNKNOWN_TYPE;
		cifs_dbg(VFS,
			"SMB3 compression support is experimental\n");
		break;
	case Opt_nodfs:
		ctx->nodfs = 1;
		break;
	case Opt_hard:
		if (result.negated)
			ctx->retry = 0;
		else
			ctx->retry = 1;
		break;
	case Opt_soft:
		if (result.negated)
			ctx->retry = 1;
		else
			ctx->retry = 0;
		break;
	case Opt_mapposix:
		if (result.negated)
			ctx->remap = false;
		else {
			ctx->remap = true;
			ctx->sfu_remap = false; /* disable SFU mapping */
		}
		break;
	case Opt_user_xattr:
		if (result.negated)
			ctx->no_xattr = 1;
		else
			ctx->no_xattr = 0;
		break;
	case Opt_forceuid:
		if (result.negated)
			ctx->override_uid = 0;
		else
			ctx->override_uid = 1;
		break;
	case Opt_forcegid:
		if (result.negated)
			ctx->override_gid = 0;
		else
			ctx->override_gid = 1;
		break;
	case Opt_perm:
		if (result.negated)
			ctx->noperm = 1;
		else
			ctx->noperm = 0;
		break;
	case Opt_dynperm:
		if (result.negated)
			ctx->dynperm = 0;
		else
			ctx->dynperm = 1;
		break;
	case Opt_sfu:
		if (result.negated)
			ctx->sfu_emul = 0;
		else
			ctx->sfu_emul = 1;
		break;
	case Opt_noblocksend:
		ctx->noblocksnd = 1;
		break;
	case Opt_noautotune:
		ctx->noautotune = 1;
		break;
	case Opt_nolease:
		ctx->no_lease = 1;
		break;
	case Opt_nodelete:
		ctx->nodelete = 1;
		break;
	case Opt_multichannel:
		if (result.negated) {
			ctx->multichannel = false;
			ctx->max_channels = 1;
		} else {
			ctx->multichannel = true;
			/* if number of channels not specified, default to 2 */
			if (ctx->max_channels < 2)
				ctx->max_channels = 2;
		}
		break;
	case Opt_uid:
		ctx->linux_uid.val = result.uint_32;
		ctx->uid_specified = true;
		break;
	case Opt_cruid:
		ctx->cred_uid.val = result.uint_32;
		break;
	case Opt_backupgid:
		ctx->backupgid.val = result.uint_32;
		ctx->backupgid_specified = true;
		break;
	case Opt_gid:
		ctx->linux_gid.val = result.uint_32;
		ctx->gid_specified = true;
		break;
	case Opt_port:
		ctx->port = result.uint_32;
		break;
	case Opt_file_mode:
		ctx->file_mode = result.uint_32;
		break;
	case Opt_dirmode:
		ctx->dir_mode = result.uint_32;
		break;
	case Opt_min_enc_offload:
		ctx->min_offload = result.uint_32;
		break;
	case Opt_blocksize:
		/*
		 * inode blocksize realistically should never need to be
		 * less than 16K or greater than 16M and default is 1MB.
		 * Note that small inode block sizes (e.g. 64K) can lead
		 * to very poor performance of common tools like cp and scp
		 */
		if ((result.uint_32 < CIFS_MAX_MSGSIZE) ||
		   (result.uint_32 > (4 * SMB3_DEFAULT_IOSIZE))) {
			cifs_dbg(VFS, "%s: Invalid blocksize\n",
				__func__);
			goto cifs_parse_mount_err;
		}
		ctx->bsize = result.uint_32;
		ctx->got_bsize = true;
		break;
	case Opt_rsize:
		ctx->rsize = result.uint_32;
		ctx->got_rsize = true;
		break;
	case Opt_wsize:
		ctx->wsize = result.uint_32;
		ctx->got_wsize = true;
		break;
	case Opt_acregmax:
		ctx->acregmax = HZ * result.uint_32;
		if (ctx->acregmax > CIFS_MAX_ACTIMEO) {
			cifs_dbg(VFS, "acregmax too large\n");
			goto cifs_parse_mount_err;
		}
		break;
	case Opt_acdirmax:
		ctx->acdirmax = HZ * result.uint_32;
		if (ctx->acdirmax > CIFS_MAX_ACTIMEO) {
			cifs_dbg(VFS, "acdirmax too large\n");
			goto cifs_parse_mount_err;
		}
		break;
	case Opt_actimeo:
		if (HZ * result.uint_32 > CIFS_MAX_ACTIMEO) {
			cifs_dbg(VFS, "timeout too large\n");
			goto cifs_parse_mount_err;
		}
		if ((ctx->acdirmax != CIFS_DEF_ACTIMEO) ||
		    (ctx->acregmax != CIFS_DEF_ACTIMEO)) {
			cifs_dbg(VFS, "actimeo ignored since acregmax or acdirmax specified\n");
			break;
		}
		ctx->acdirmax = ctx->acregmax = HZ * result.uint_32;
		break;
	case Opt_echo_interval:
		ctx->echo_interval = result.uint_32;
		break;
	case Opt_snapshot:
		ctx->snapshot_time = result.uint_32;
		break;
	case Opt_max_credits:
		if (result.uint_32 < 20 || result.uint_32 > 60000) {
			cifs_dbg(VFS, "%s: Invalid max_credits value\n",
				 __func__);
			goto cifs_parse_mount_err;
		}
		ctx->max_credits = result.uint_32;
		break;
	case Opt_max_channels:
		if (result.uint_32 < 1 || result.uint_32 > CIFS_MAX_CHANNELS) {
			cifs_dbg(VFS, "%s: Invalid max_channels value, needs to be 1-%d\n",
				 __func__, CIFS_MAX_CHANNELS);
			goto cifs_parse_mount_err;
		}
		ctx->max_channels = result.uint_32;
		break;
	case Opt_handletimeout:
		ctx->handle_timeout = result.uint_32;
		if (ctx->handle_timeout > SMB3_MAX_HANDLE_TIMEOUT) {
			cifs_dbg(VFS, "Invalid handle cache timeout, longer than 16 minutes\n");
			goto cifs_parse_mount_err;
		}
		break;
	case Opt_source:
		kfree(ctx->UNC);
		ctx->UNC = NULL;
		switch (smb3_parse_devname(param->string, ctx)) {
		case 0:
			break;
		case -ENOMEM:
			cifs_dbg(VFS, "Unable to allocate memory for devname\n");
			goto cifs_parse_mount_err;
		case -EINVAL:
			cifs_dbg(VFS, "Malformed UNC in devname\n");
			goto cifs_parse_mount_err;
		default:
			cifs_dbg(VFS, "Unknown error parsing devname\n");
			goto cifs_parse_mount_err;
		}
		ctx->source = kstrdup(param->string, GFP_KERNEL);
		if (ctx->source == NULL) {
			cifs_dbg(VFS, "OOM when copying UNC string\n");
			goto cifs_parse_mount_err;
		}
		fc->source = kstrdup(param->string, GFP_KERNEL);
		if (fc->source == NULL) {
			cifs_dbg(VFS, "OOM when copying UNC string\n");
			goto cifs_parse_mount_err;
		}
		break;
	case Opt_user:
		kfree(ctx->username);
		ctx->username = NULL;
		if (strlen(param->string) == 0) {
			/* null user, ie. anonymous authentication */
			ctx->nullauth = 1;
			break;
		}

		if (strnlen(param->string, CIFS_MAX_USERNAME_LEN) >
		    CIFS_MAX_USERNAME_LEN) {
			pr_warn("username too long\n");
			goto cifs_parse_mount_err;
		}
		ctx->username = kstrdup(param->string, GFP_KERNEL);
		if (ctx->username == NULL) {
			cifs_dbg(VFS, "OOM when copying username string\n");
			goto cifs_parse_mount_err;
		}
		break;
	case Opt_pass:
		kfree(ctx->password);
		ctx->password = NULL;
		if (strlen(param->string) == 0)
			break;

		ctx->password = kstrdup(param->string, GFP_KERNEL);
		if (ctx->password == NULL) {
			cifs_dbg(VFS, "OOM when copying password string\n");
			goto cifs_parse_mount_err;
		}
		break;
	case Opt_ip:
		if (strlen(param->string) == 0) {
			ctx->got_ip = false;
			break;
		}
		if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr,
					  param->string,
					  strlen(param->string))) {
			pr_err("bad ip= option (%s)\n", param->string);
			goto cifs_parse_mount_err;
		}
		ctx->got_ip = true;
		break;
	case Opt_domain:
		if (strnlen(param->string, CIFS_MAX_DOMAINNAME_LEN)
				== CIFS_MAX_DOMAINNAME_LEN) {
			pr_warn("domain name too long\n");
			goto cifs_parse_mount_err;
		}

		kfree(ctx->domainname);
		ctx->domainname = kstrdup(param->string, GFP_KERNEL);
		if (ctx->domainname == NULL) {
			cifs_dbg(VFS, "OOM when copying domainname string\n");
			goto cifs_parse_mount_err;
		}
		cifs_dbg(FYI, "Domain name set\n");
		break;
	case Opt_srcaddr:
		if (!cifs_convert_address(
				(struct sockaddr *)&ctx->srcaddr,
				param->string, strlen(param->string))) {
			pr_warn("Could not parse srcaddr: %s\n",
				param->string);
			goto cifs_parse_mount_err;
		}
		break;
	case Opt_iocharset:
		if (strnlen(param->string, 1024) >= 65) {
			pr_warn("iocharset name too long\n");
			goto cifs_parse_mount_err;
		}

		if (strncasecmp(param->string, "default", 7) != 0) {
			kfree(ctx->iocharset);
			ctx->iocharset = kstrdup(param->string, GFP_KERNEL);
			if (ctx->iocharset == NULL) {
				cifs_dbg(VFS, "OOM when copying iocharset string\n");
				goto cifs_parse_mount_err;
			}
		}
		/* if iocharset not set then load_nls_default
		 * is used by caller
		 */
		 cifs_dbg(FYI, "iocharset set to %s\n", ctx->iocharset);
		break;
	case Opt_netbiosname:
		memset(ctx->source_rfc1001_name, 0x20,
			RFC1001_NAME_LEN);
		/*
		 * FIXME: are there cases in which a comma can
		 * be valid in workstation netbios name (and
		 * need special handling)?
		 */
		for (i = 0; i < RFC1001_NAME_LEN; i++) {
			/* don't ucase netbiosname for user */
			if (param->string[i] == 0)
				break;
			ctx->source_rfc1001_name[i] = param->string[i];
		}
		/* The string has 16th byte zero still from
		 * set at top of the function
		 */
		if (i == RFC1001_NAME_LEN && param->string[i] != 0)
			pr_warn("netbiosname longer than 15 truncated\n");
		break;
	case Opt_servern:
		/* last byte, type, is 0x20 for servr type */
		memset(ctx->target_rfc1001_name, 0x20,
			RFC1001_NAME_LEN_WITH_NULL);
		/*
		 * BB are there cases in which a comma can be valid in this
		 * workstation netbios name (and need special handling)?
		 */

		/* user or mount helper must uppercase the netbios name */
		for (i = 0; i < 15; i++) {
			if (param->string[i] == 0)
				break;
			ctx->target_rfc1001_name[i] = param->string[i];
		}

		/* The string has 16th byte zero still from set at top of function */
		if (i == RFC1001_NAME_LEN && param->string[i] != 0)
			pr_warn("server netbiosname longer than 15 truncated\n");
		break;
	case Opt_ver:
		/* version of mount userspace tools, not dialect */
		/* If interface changes in mount.cifs bump to new ver */
		if (strncasecmp(param->string, "1", 1) == 0) {
			if (strlen(param->string) > 1) {
				pr_warn("Bad mount helper ver=%s. Did you want SMB1 (CIFS) dialect and mean to type vers=1.0 instead?\n",
					param->string);
				goto cifs_parse_mount_err;
			}
			/* This is the default */
			break;
		}
		/* For all other value, error */
		pr_warn("Invalid mount helper version specified\n");
		goto cifs_parse_mount_err;
	case Opt_vers:
		/* protocol version (dialect) */
		if (cifs_parse_smb_version(param->string, ctx, is_smb3) != 0)
			goto cifs_parse_mount_err;
		ctx->got_version = true;
		break;
	case Opt_sec:
		if (cifs_parse_security_flavors(param->string, ctx) != 0)
			goto cifs_parse_mount_err;
		break;
	case Opt_cache:
		if (cifs_parse_cache_flavor(param->string, ctx) != 0)
			goto cifs_parse_mount_err;
		break;
	case Opt_witness:
#ifndef CONFIG_CIFS_SWN_UPCALL
		cifs_dbg(VFS, "Witness support needs CONFIG_CIFS_SWN_UPCALL config option\n");
			goto cifs_parse_mount_err;
#endif
		ctx->witness = true;
		pr_warn_once("Witness protocol support is experimental\n");
		break;
	case Opt_rootfs:
#ifdef CONFIG_CIFS_ROOT
		ctx->rootfs = true;
#endif
		break;
	case Opt_posixpaths:
		if (result.negated)
			ctx->posix_paths = 0;
		else
			ctx->posix_paths = 1;
		break;
	case Opt_unix:
		if (result.negated)
			ctx->linux_ext = 0;
		else
			ctx->no_linux_ext = 1;
		break;
	case Opt_nocase:
		ctx->nocase = 1;
		break;
	case Opt_brl:
		if (result.negated) {
			/*
			 * turn off mandatory locking in mode
			 * if remote locking is turned off since the
			 * local vfs will do advisory
			 */
			if (ctx->file_mode ==
				(S_IALLUGO & ~(S_ISUID | S_IXGRP)))
				ctx->file_mode = S_IALLUGO;
			ctx->nobrl =  1;
		} else
			ctx->nobrl =  0;
		break;
	case Opt_handlecache:
		if (result.negated)
			ctx->nohandlecache = 1;
		else
			ctx->nohandlecache = 0;
		break;
	case Opt_forcemandatorylock:
		ctx->mand_lock = 1;
		break;
	case Opt_setuids:
		ctx->setuids = result.negated;
		break;
	case Opt_intr:
		ctx->intr = !result.negated;
		break;
	case Opt_setuidfromacl:
		ctx->setuidfromacl = 1;
		break;
	case Opt_strictsync:
		ctx->nostrictsync = result.negated;
		break;
	case Opt_serverino:
		ctx->server_ino = !result.negated;
		break;
	case Opt_rwpidforward:
		ctx->rwpidforward = 1;
		break;
	case Opt_modesid:
		ctx->mode_ace = 1;
		break;
	case Opt_cifsacl:
		ctx->cifs_acl = !result.negated;
		break;
	case Opt_acl:
		ctx->no_psx_acl = result.negated;
		break;
	case Opt_locallease:
		ctx->local_lease = 1;
		break;
	case Opt_sign:
		ctx->sign = true;
		break;
	case Opt_ignore_signature:
		ctx->sign = true;
		ctx->ignore_signature = true;
		break;
	case Opt_seal:
		/* we do not do the following in secFlags because seal
		 * is a per tree connection (mount) not a per socket
		 * or per-smb connection option in the protocol
		 * vol->secFlg |= CIFSSEC_MUST_SEAL;
		 */
		ctx->seal = 1;
		break;
	case Opt_noac:
		pr_warn("Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
		break;
	case Opt_fsc:
#ifndef CONFIG_CIFS_FSCACHE
		cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
		goto cifs_parse_mount_err;
#endif
		ctx->fsc = true;
		break;
	case Opt_mfsymlinks:
		ctx->mfsymlinks = true;
		break;
	case Opt_multiuser:
		ctx->multiuser = true;
		break;
	case Opt_sloppy:
		ctx->sloppy = true;
		break;
	case Opt_nosharesock:
		ctx->nosharesock = true;
		break;
	case Opt_persistent:
		if (result.negated) {
			ctx->nopersistent = true;
			if (ctx->persistent) {
				cifs_dbg(VFS,
				  "persistenthandles mount options conflict\n");
				goto cifs_parse_mount_err;
			}
		} else {
			ctx->persistent = true;
			if ((ctx->nopersistent) || (ctx->resilient)) {
				cifs_dbg(VFS,
				  "persistenthandles mount options conflict\n");
				goto cifs_parse_mount_err;
			}
		}
		break;
	case Opt_resilient:
		if (result.negated) {
			ctx->resilient = false; /* already the default */
		} else {
			ctx->resilient = true;
			if (ctx->persistent) {
				cifs_dbg(VFS,
				  "persistenthandles mount options conflict\n");
				goto cifs_parse_mount_err;
			}
		}
		break;
	case Opt_domainauto:
		ctx->domainauto = true;
		break;
	case Opt_rdma:
		ctx->rdma = true;
		break;
	}
	/* case Opt_ignore: - is ignored as expected ... */

	return 0;

 cifs_parse_mount_err:
	return -EINVAL;
}

int smb3_init_fs_context(struct fs_context *fc)
{
	struct smb3_fs_context *ctx;
	char *nodename = utsname()->nodename;
	int i;

	ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL);
	if (unlikely(!ctx))
		return -ENOMEM;

	/*
	 * does not have to be perfect mapping since field is
	 * informational, only used for servers that do not support
	 * port 445 and it can be overridden at mount time
	 */
	memset(ctx->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
	for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
		ctx->source_rfc1001_name[i] = toupper(nodename[i]);

	ctx->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
	/*
	 * null target name indicates to use *SMBSERVR default called name
	 *  if we end up sending RFC1001 session initialize
	 */
	ctx->target_rfc1001_name[0] = 0;
	ctx->cred_uid = current_uid();
	ctx->linux_uid = current_uid();
	ctx->linux_gid = current_gid();
	ctx->bsize = 1024 * 1024; /* can improve cp performance significantly */

	/*
	 * default to SFM style remapping of seven reserved characters
	 * unless user overrides it or we negotiate CIFS POSIX where
	 * it is unnecessary.  Can not simultaneously use more than one mapping
	 * since then readdir could list files that open could not open
	 */
	ctx->remap = true;

	/* default to only allowing write access to owner of the mount */
	ctx->dir_mode = ctx->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;

	/* ctx->retry default is 0 (i.e. "soft" limited retry not hard retry) */
	/* default is always to request posix paths. */
	ctx->posix_paths = 1;
	/* default to using server inode numbers where available */
	ctx->server_ino = 1;

	/* default is to use strict cifs caching semantics */
	ctx->strict_io = true;

	ctx->acregmax = CIFS_DEF_ACTIMEO;
	ctx->acdirmax = CIFS_DEF_ACTIMEO;

	/* Most clients set timeout to 0, allows server to use its default */
	ctx->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */

	/* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
	ctx->ops = &smb30_operations;
	ctx->vals = &smbdefault_values;

	ctx->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;

	/* default to no multichannel (single server connection) */
	ctx->multichannel = false;
	ctx->max_channels = 1;

	ctx->backupuid_specified = false; /* no backup intent for a user */
	ctx->backupgid_specified = false; /* no backup intent for a group */

/*
 *	short int override_uid = -1;
 *	short int override_gid = -1;
 *	char *nodename = strdup(utsname()->nodename);
 *	struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
 */

	fc->fs_private = ctx;
	fc->ops = &smb3_fs_context_ops;
	return 0;
}

void
smb3_cleanup_fs_context_contents(struct smb3_fs_context *ctx)
{
	if (ctx == NULL)
		return;

	/*
	 * Make sure this stays in sync with smb3_fs_context_dup()
	 */
	kfree(ctx->mount_options);
	ctx->mount_options = NULL;
	kfree(ctx->username);
	ctx->username = NULL;
	kfree_sensitive(ctx->password);
	ctx->password = NULL;
	kfree(ctx->UNC);
	ctx->UNC = NULL;
	kfree(ctx->source);
	ctx->source = NULL;
	kfree(ctx->domainname);
	ctx->domainname = NULL;
	kfree(ctx->nodename);
	ctx->nodename = NULL;
	kfree(ctx->iocharset);
	ctx->iocharset = NULL;
	kfree(ctx->prepath);
	ctx->prepath = NULL;
}

void
smb3_cleanup_fs_context(struct smb3_fs_context *ctx)
{
	if (!ctx)
		return;
	smb3_cleanup_fs_context_contents(ctx);
	kfree(ctx);
}

void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb)
{
	struct smb3_fs_context *ctx = cifs_sb->ctx;

	if (ctx->nodfs)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_DFS;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_DFS;

	if (ctx->noperm)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_PERM;

	if (ctx->setuids)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SET_UID;

	if (ctx->setuidfromacl)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_UID_FROM_ACL;

	if (ctx->server_ino)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;

	if (ctx->remap)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MAP_SFM_CHR;

	if (ctx->sfu_remap)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MAP_SPECIAL_CHR;

	if (ctx->no_xattr)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_XATTR;

	if (ctx->sfu_emul)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_UNX_EMUL;

	if (ctx->nobrl)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_BRL;

	if (ctx->nohandlecache)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_HANDLE_CACHE;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_HANDLE_CACHE;

	if (ctx->nostrictsync)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NOSSYNC;

	if (ctx->mand_lock)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NOPOSIXBRL;

	if (ctx->rwpidforward)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_RWPIDFORWARD;

	if (ctx->mode_ace)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MODE_FROM_SID;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MODE_FROM_SID;

	if (ctx->cifs_acl)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_ACL;

	if (ctx->backupuid_specified)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_BACKUPUID;

	if (ctx->backupgid_specified)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_BACKUPGID;

	if (ctx->override_uid)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_OVERR_UID;

	if (ctx->override_gid)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_OVERR_GID;

	if (ctx->dynperm)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_DYNPERM;

	if (ctx->fsc)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_FSCACHE;

	if (ctx->multiuser)
		cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
					    CIFS_MOUNT_NO_PERM);
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MULTIUSER;


	if (ctx->strict_io)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_STRICT_IO;

	if (ctx->direct_io)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_DIRECT_IO;

	if (ctx->mfsymlinks)
		cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
	else
		cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MF_SYMLINKS;
	if (ctx->mfsymlinks) {
		if (ctx->sfu_emul) {
			/*
			 * Our SFU ("Services for Unix" emulation does not allow
			 * creating symlinks but does allow reading existing SFU
			 * symlinks (it does allow both creating and reading SFU
			 * style mknod and FIFOs though). When "mfsymlinks" and
			 * "sfu" are both enabled at the same time, it allows
			 * reading both types of symlinks, but will only create
			 * them with mfsymlinks format. This allows better
			 * Apple compatibility (probably better for Samba too)
			 * while still recognizing old Windows style symlinks.
			 */
			cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
		}
	}

	return;
}