1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2020, Microsoft Corporation. 4 * 5 * Author(s): Steve French <stfrench@microsoft.com> 6 * David Howells <dhowells@redhat.com> 7 */ 8 9 /* 10 #include <linux/module.h> 11 #include <linux/nsproxy.h> 12 #include <linux/slab.h> 13 #include <linux/magic.h> 14 #include <linux/security.h> 15 #include <net/net_namespace.h> 16 #ifdef CONFIG_CIFS_DFS_UPCALL 17 #include "dfs_cache.h" 18 #endif 19 */ 20 21 #include <linux/ctype.h> 22 #include <linux/fs_context.h> 23 #include <linux/fs_parser.h> 24 #include <linux/fs.h> 25 #include <linux/mount.h> 26 #include <linux/parser.h> 27 #include <linux/utsname.h> 28 #include "cifsfs.h" 29 #include "cifspdu.h" 30 #include "cifsglob.h" 31 #include "cifsproto.h" 32 #include "cifs_unicode.h" 33 #include "cifs_debug.h" 34 #include "cifs_fs_sb.h" 35 #include "ntlmssp.h" 36 #include "nterr.h" 37 #include "rfc1002pdu.h" 38 #include "fs_context.h" 39 40 DEFINE_MUTEX(cifs_mount_mutex); 41 42 static const match_table_t cifs_smb_version_tokens = { 43 { Smb_1, SMB1_VERSION_STRING }, 44 { Smb_20, SMB20_VERSION_STRING}, 45 { Smb_21, SMB21_VERSION_STRING }, 46 { Smb_30, SMB30_VERSION_STRING }, 47 { Smb_302, SMB302_VERSION_STRING }, 48 { Smb_302, ALT_SMB302_VERSION_STRING }, 49 { Smb_311, SMB311_VERSION_STRING }, 50 { Smb_311, ALT_SMB311_VERSION_STRING }, 51 { Smb_3any, SMB3ANY_VERSION_STRING }, 52 { Smb_default, SMBDEFAULT_VERSION_STRING }, 53 { Smb_version_err, NULL } 54 }; 55 56 static const match_table_t cifs_secflavor_tokens = { 57 { Opt_sec_krb5, "krb5" }, 58 { Opt_sec_krb5i, "krb5i" }, 59 { Opt_sec_krb5p, "krb5p" }, 60 { Opt_sec_ntlmsspi, "ntlmsspi" }, 61 { Opt_sec_ntlmssp, "ntlmssp" }, 62 { Opt_sec_ntlmv2, "nontlm" }, 63 { Opt_sec_ntlmv2, "ntlmv2" }, 64 { Opt_sec_ntlmv2i, "ntlmv2i" }, 65 { Opt_sec_none, "none" }, 66 67 { Opt_sec_err, NULL } 68 }; 69 70 const struct fs_parameter_spec smb3_fs_parameters[] = { 71 /* Mount options that take no arguments */ 72 fsparam_flag_no("user_xattr", Opt_user_xattr), 73 fsparam_flag_no("forceuid", Opt_forceuid), 74 fsparam_flag_no("multichannel", Opt_multichannel), 75 fsparam_flag_no("forcegid", Opt_forcegid), 76 fsparam_flag("noblocksend", Opt_noblocksend), 77 fsparam_flag("noautotune", Opt_noautotune), 78 fsparam_flag("nolease", Opt_nolease), 79 fsparam_flag_no("hard", Opt_hard), 80 fsparam_flag_no("soft", Opt_soft), 81 fsparam_flag_no("perm", Opt_perm), 82 fsparam_flag("nodelete", Opt_nodelete), 83 fsparam_flag_no("mapposix", Opt_mapposix), 84 fsparam_flag("mapchars", Opt_mapchars), 85 fsparam_flag("nomapchars", Opt_nomapchars), 86 fsparam_flag_no("sfu", Opt_sfu), 87 fsparam_flag("nodfs", Opt_nodfs), 88 fsparam_flag_no("posixpaths", Opt_posixpaths), 89 fsparam_flag_no("unix", Opt_unix), 90 fsparam_flag_no("linux", Opt_unix), 91 fsparam_flag_no("posix", Opt_unix), 92 fsparam_flag("nocase", Opt_nocase), 93 fsparam_flag("ignorecase", Opt_nocase), 94 fsparam_flag_no("brl", Opt_brl), 95 fsparam_flag_no("handlecache", Opt_handlecache), 96 fsparam_flag("forcemandatorylock", Opt_forcemandatorylock), 97 fsparam_flag("forcemand", Opt_forcemandatorylock), 98 fsparam_flag("setuidfromacl", Opt_setuidfromacl), 99 fsparam_flag("idsfromsid", Opt_setuidfromacl), 100 fsparam_flag_no("setuids", Opt_setuids), 101 fsparam_flag_no("dynperm", Opt_dynperm), 102 fsparam_flag_no("intr", Opt_intr), 103 fsparam_flag_no("strictsync", Opt_strictsync), 104 fsparam_flag_no("serverino", Opt_serverino), 105 fsparam_flag("rwpidforward", Opt_rwpidforward), 106 fsparam_flag("cifsacl", Opt_cifsacl), 107 fsparam_flag_no("acl", Opt_acl), 108 fsparam_flag("locallease", Opt_locallease), 109 fsparam_flag("sign", Opt_sign), 110 fsparam_flag("ignore_signature", Opt_ignore_signature), 111 fsparam_flag("signloosely", Opt_ignore_signature), 112 fsparam_flag("seal", Opt_seal), 113 fsparam_flag("noac", Opt_noac), 114 fsparam_flag("fsc", Opt_fsc), 115 fsparam_flag("mfsymlinks", Opt_mfsymlinks), 116 fsparam_flag("multiuser", Opt_multiuser), 117 fsparam_flag("sloppy", Opt_sloppy), 118 fsparam_flag("nosharesock", Opt_nosharesock), 119 fsparam_flag_no("persistenthandles", Opt_persistent), 120 fsparam_flag_no("resilienthandles", Opt_resilient), 121 fsparam_flag_no("tcpnodelay", Opt_tcp_nodelay), 122 fsparam_flag("nosparse", Opt_nosparse), 123 fsparam_flag("domainauto", Opt_domainauto), 124 fsparam_flag("rdma", Opt_rdma), 125 fsparam_flag("modesid", Opt_modesid), 126 fsparam_flag("modefromsid", Opt_modesid), 127 fsparam_flag("rootfs", Opt_rootfs), 128 fsparam_flag("compress", Opt_compress), 129 fsparam_flag("witness", Opt_witness), 130 131 /* Mount options which take numeric value */ 132 fsparam_u32("backupuid", Opt_backupuid), 133 fsparam_u32("backupgid", Opt_backupgid), 134 fsparam_u32("uid", Opt_uid), 135 fsparam_u32("cruid", Opt_cruid), 136 fsparam_u32("gid", Opt_gid), 137 fsparam_u32("file_mode", Opt_file_mode), 138 fsparam_u32("dirmode", Opt_dirmode), 139 fsparam_u32("dir_mode", Opt_dirmode), 140 fsparam_u32("port", Opt_port), 141 fsparam_u32("min_enc_offload", Opt_min_enc_offload), 142 fsparam_u32("retrans", Opt_retrans), 143 fsparam_u32("esize", Opt_min_enc_offload), 144 fsparam_u32("bsize", Opt_blocksize), 145 fsparam_u32("rasize", Opt_rasize), 146 fsparam_u32("rsize", Opt_rsize), 147 fsparam_u32("wsize", Opt_wsize), 148 fsparam_u32("actimeo", Opt_actimeo), 149 fsparam_u32("acdirmax", Opt_acdirmax), 150 fsparam_u32("acregmax", Opt_acregmax), 151 fsparam_u32("closetimeo", Opt_closetimeo), 152 fsparam_u32("echo_interval", Opt_echo_interval), 153 fsparam_u32("max_credits", Opt_max_credits), 154 fsparam_u32("max_cached_dirs", Opt_max_cached_dirs), 155 fsparam_u32("handletimeout", Opt_handletimeout), 156 fsparam_u64("snapshot", Opt_snapshot), 157 fsparam_u32("max_channels", Opt_max_channels), 158 159 /* Mount options which take string value */ 160 fsparam_string("source", Opt_source), 161 fsparam_string("user", Opt_user), 162 fsparam_string("username", Opt_user), 163 fsparam_string("pass", Opt_pass), 164 fsparam_string("password", Opt_pass), 165 fsparam_string("password2", Opt_pass2), 166 fsparam_string("ip", Opt_ip), 167 fsparam_string("addr", Opt_ip), 168 fsparam_string("domain", Opt_domain), 169 fsparam_string("dom", Opt_domain), 170 fsparam_string("srcaddr", Opt_srcaddr), 171 fsparam_string("iocharset", Opt_iocharset), 172 fsparam_string("netbiosname", Opt_netbiosname), 173 fsparam_string("servern", Opt_servern), 174 fsparam_string("ver", Opt_ver), 175 fsparam_string("vers", Opt_vers), 176 fsparam_string("sec", Opt_sec), 177 fsparam_string("cache", Opt_cache), 178 fsparam_string("reparse", Opt_reparse), 179 180 /* Arguments that should be ignored */ 181 fsparam_flag("guest", Opt_ignore), 182 fsparam_flag("noatime", Opt_ignore), 183 fsparam_flag("relatime", Opt_ignore), 184 fsparam_flag("_netdev", Opt_ignore), 185 fsparam_flag_no("suid", Opt_ignore), 186 fsparam_flag_no("exec", Opt_ignore), 187 fsparam_flag_no("dev", Opt_ignore), 188 fsparam_flag_no("mand", Opt_ignore), 189 fsparam_flag_no("auto", Opt_ignore), 190 fsparam_string("cred", Opt_ignore), 191 fsparam_string("credentials", Opt_ignore), 192 /* 193 * UNC and prefixpath is now extracted from Opt_source 194 * in the new mount API so we can just ignore them going forward. 195 */ 196 fsparam_string("unc", Opt_ignore), 197 fsparam_string("prefixpath", Opt_ignore), 198 {} 199 }; 200 201 static int 202 cifs_parse_security_flavors(struct fs_context *fc, char *value, struct smb3_fs_context *ctx) 203 { 204 205 substring_t args[MAX_OPT_ARGS]; 206 207 /* 208 * With mount options, the last one should win. Reset any existing 209 * settings back to default. 210 */ 211 ctx->sectype = Unspecified; 212 ctx->sign = false; 213 214 switch (match_token(value, cifs_secflavor_tokens, args)) { 215 case Opt_sec_krb5p: 216 cifs_errorf(fc, "sec=krb5p is not supported. Use sec=krb5,seal instead\n"); 217 return 1; 218 case Opt_sec_krb5i: 219 ctx->sign = true; 220 fallthrough; 221 case Opt_sec_krb5: 222 ctx->sectype = Kerberos; 223 break; 224 case Opt_sec_ntlmsspi: 225 ctx->sign = true; 226 fallthrough; 227 case Opt_sec_ntlmssp: 228 ctx->sectype = RawNTLMSSP; 229 break; 230 case Opt_sec_ntlmv2i: 231 ctx->sign = true; 232 fallthrough; 233 case Opt_sec_ntlmv2: 234 ctx->sectype = NTLMv2; 235 break; 236 case Opt_sec_none: 237 ctx->nullauth = 1; 238 kfree(ctx->username); 239 ctx->username = NULL; 240 break; 241 default: 242 cifs_errorf(fc, "bad security option: %s\n", value); 243 return 1; 244 } 245 246 return 0; 247 } 248 249 static const match_table_t cifs_cacheflavor_tokens = { 250 { Opt_cache_loose, "loose" }, 251 { Opt_cache_strict, "strict" }, 252 { Opt_cache_none, "none" }, 253 { Opt_cache_ro, "ro" }, 254 { Opt_cache_rw, "singleclient" }, 255 { Opt_cache_err, NULL } 256 }; 257 258 static int 259 cifs_parse_cache_flavor(struct fs_context *fc, char *value, struct smb3_fs_context *ctx) 260 { 261 substring_t args[MAX_OPT_ARGS]; 262 263 switch (match_token(value, cifs_cacheflavor_tokens, args)) { 264 case Opt_cache_loose: 265 ctx->direct_io = false; 266 ctx->strict_io = false; 267 ctx->cache_ro = false; 268 ctx->cache_rw = false; 269 break; 270 case Opt_cache_strict: 271 ctx->direct_io = false; 272 ctx->strict_io = true; 273 ctx->cache_ro = false; 274 ctx->cache_rw = false; 275 break; 276 case Opt_cache_none: 277 ctx->direct_io = true; 278 ctx->strict_io = false; 279 ctx->cache_ro = false; 280 ctx->cache_rw = false; 281 break; 282 case Opt_cache_ro: 283 ctx->direct_io = false; 284 ctx->strict_io = false; 285 ctx->cache_ro = true; 286 ctx->cache_rw = false; 287 break; 288 case Opt_cache_rw: 289 ctx->direct_io = false; 290 ctx->strict_io = false; 291 ctx->cache_ro = false; 292 ctx->cache_rw = true; 293 break; 294 default: 295 cifs_errorf(fc, "bad cache= option: %s\n", value); 296 return 1; 297 } 298 return 0; 299 } 300 301 static const match_table_t reparse_flavor_tokens = { 302 { Opt_reparse_default, "default" }, 303 { Opt_reparse_nfs, "nfs" }, 304 { Opt_reparse_wsl, "wsl" }, 305 { Opt_reparse_err, NULL }, 306 }; 307 308 static int parse_reparse_flavor(struct fs_context *fc, char *value, 309 struct smb3_fs_context *ctx) 310 { 311 substring_t args[MAX_OPT_ARGS]; 312 313 switch (match_token(value, reparse_flavor_tokens, args)) { 314 case Opt_reparse_default: 315 ctx->reparse_type = CIFS_REPARSE_TYPE_DEFAULT; 316 break; 317 case Opt_reparse_nfs: 318 ctx->reparse_type = CIFS_REPARSE_TYPE_NFS; 319 break; 320 case Opt_reparse_wsl: 321 ctx->reparse_type = CIFS_REPARSE_TYPE_WSL; 322 break; 323 default: 324 cifs_errorf(fc, "bad reparse= option: %s\n", value); 325 return 1; 326 } 327 return 0; 328 } 329 330 #define DUP_CTX_STR(field) \ 331 do { \ 332 if (ctx->field) { \ 333 new_ctx->field = kstrdup(ctx->field, GFP_ATOMIC); \ 334 if (new_ctx->field == NULL) { \ 335 smb3_cleanup_fs_context_contents(new_ctx); \ 336 return -ENOMEM; \ 337 } \ 338 } \ 339 } while (0) 340 341 int 342 smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx) 343 { 344 memcpy(new_ctx, ctx, sizeof(*ctx)); 345 new_ctx->prepath = NULL; 346 new_ctx->nodename = NULL; 347 new_ctx->username = NULL; 348 new_ctx->password = NULL; 349 new_ctx->password2 = NULL; 350 new_ctx->server_hostname = NULL; 351 new_ctx->domainname = NULL; 352 new_ctx->UNC = NULL; 353 new_ctx->source = NULL; 354 new_ctx->iocharset = NULL; 355 new_ctx->leaf_fullpath = NULL; 356 /* 357 * Make sure to stay in sync with smb3_cleanup_fs_context_contents() 358 */ 359 DUP_CTX_STR(prepath); 360 DUP_CTX_STR(username); 361 DUP_CTX_STR(password); 362 DUP_CTX_STR(password2); 363 DUP_CTX_STR(server_hostname); 364 DUP_CTX_STR(UNC); 365 DUP_CTX_STR(source); 366 DUP_CTX_STR(domainname); 367 DUP_CTX_STR(nodename); 368 DUP_CTX_STR(iocharset); 369 DUP_CTX_STR(leaf_fullpath); 370 371 return 0; 372 } 373 374 static int 375 cifs_parse_smb_version(struct fs_context *fc, char *value, struct smb3_fs_context *ctx, bool is_smb3) 376 { 377 substring_t args[MAX_OPT_ARGS]; 378 379 switch (match_token(value, cifs_smb_version_tokens, args)) { 380 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 381 case Smb_1: 382 if (disable_legacy_dialects) { 383 cifs_errorf(fc, "mount with legacy dialect disabled\n"); 384 return 1; 385 } 386 if (is_smb3) { 387 cifs_errorf(fc, "vers=1.0 (cifs) not permitted when mounting with smb3\n"); 388 return 1; 389 } 390 cifs_errorf(fc, "Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers\n"); 391 ctx->ops = &smb1_operations; 392 ctx->vals = &smb1_values; 393 break; 394 case Smb_20: 395 if (disable_legacy_dialects) { 396 cifs_errorf(fc, "mount with legacy dialect disabled\n"); 397 return 1; 398 } 399 if (is_smb3) { 400 cifs_errorf(fc, "vers=2.0 not permitted when mounting with smb3\n"); 401 return 1; 402 } 403 ctx->ops = &smb20_operations; 404 ctx->vals = &smb20_values; 405 break; 406 #else 407 case Smb_1: 408 cifs_errorf(fc, "vers=1.0 (cifs) mount not permitted when legacy dialects disabled\n"); 409 return 1; 410 case Smb_20: 411 cifs_errorf(fc, "vers=2.0 mount not permitted when legacy dialects disabled\n"); 412 return 1; 413 #endif /* CIFS_ALLOW_INSECURE_LEGACY */ 414 case Smb_21: 415 ctx->ops = &smb21_operations; 416 ctx->vals = &smb21_values; 417 break; 418 case Smb_30: 419 ctx->ops = &smb30_operations; 420 ctx->vals = &smb30_values; 421 break; 422 case Smb_302: 423 ctx->ops = &smb30_operations; /* currently identical with 3.0 */ 424 ctx->vals = &smb302_values; 425 break; 426 case Smb_311: 427 ctx->ops = &smb311_operations; 428 ctx->vals = &smb311_values; 429 break; 430 case Smb_3any: 431 ctx->ops = &smb30_operations; /* currently identical with 3.0 */ 432 ctx->vals = &smb3any_values; 433 break; 434 case Smb_default: 435 ctx->ops = &smb30_operations; 436 ctx->vals = &smbdefault_values; 437 break; 438 default: 439 cifs_errorf(fc, "Unknown vers= option specified: %s\n", value); 440 return 1; 441 } 442 return 0; 443 } 444 445 int smb3_parse_opt(const char *options, const char *key, char **val) 446 { 447 int rc = -ENOENT; 448 char *opts, *orig, *p; 449 450 orig = opts = kstrdup(options, GFP_KERNEL); 451 if (!opts) 452 return -ENOMEM; 453 454 while ((p = strsep(&opts, ","))) { 455 char *nval; 456 457 if (!*p) 458 continue; 459 if (strncasecmp(p, key, strlen(key))) 460 continue; 461 nval = strchr(p, '='); 462 if (nval) { 463 if (nval == p) 464 continue; 465 *nval++ = 0; 466 *val = kstrdup(nval, GFP_KERNEL); 467 rc = !*val ? -ENOMEM : 0; 468 goto out; 469 } 470 } 471 out: 472 kfree(orig); 473 return rc; 474 } 475 476 /* 477 * Remove duplicate path delimiters. Windows is supposed to do that 478 * but there are some bugs that prevent rename from working if there are 479 * multiple delimiters. 480 * 481 * Return a sanitized duplicate of @path or NULL for empty prefix paths. 482 * Otherwise, return ERR_PTR. 483 * 484 * @gfp indicates the GFP_* flags for kstrdup. 485 * The caller is responsible for freeing the original. 486 */ 487 #define IS_DELIM(c) ((c) == '/' || (c) == '\\') 488 char *cifs_sanitize_prepath(char *prepath, gfp_t gfp) 489 { 490 char *cursor1 = prepath, *cursor2 = prepath; 491 char *s; 492 493 /* skip all prepended delimiters */ 494 while (IS_DELIM(*cursor1)) 495 cursor1++; 496 497 /* copy the first letter */ 498 *cursor2 = *cursor1; 499 500 /* copy the remainder... */ 501 while (*(cursor1++)) { 502 /* ... skipping all duplicated delimiters */ 503 if (IS_DELIM(*cursor1) && IS_DELIM(*cursor2)) 504 continue; 505 *(++cursor2) = *cursor1; 506 } 507 508 /* if the last character is a delimiter, skip it */ 509 if (IS_DELIM(*(cursor2 - 1))) 510 cursor2--; 511 512 *cursor2 = '\0'; 513 if (!*prepath) 514 return NULL; 515 s = kstrdup(prepath, gfp); 516 if (!s) 517 return ERR_PTR(-ENOMEM); 518 return s; 519 } 520 521 /* 522 * Return full path based on the values of @ctx->{UNC,prepath}. 523 * 524 * It is assumed that both values were already parsed by smb3_parse_devname(). 525 */ 526 char *smb3_fs_context_fullpath(const struct smb3_fs_context *ctx, char dirsep) 527 { 528 size_t ulen, plen; 529 char *s; 530 531 ulen = strlen(ctx->UNC); 532 plen = ctx->prepath ? strlen(ctx->prepath) + 1 : 0; 533 534 s = kmalloc(ulen + plen + 1, GFP_KERNEL); 535 if (!s) 536 return ERR_PTR(-ENOMEM); 537 memcpy(s, ctx->UNC, ulen); 538 if (plen) { 539 s[ulen] = dirsep; 540 memcpy(s + ulen + 1, ctx->prepath, plen); 541 } 542 s[ulen + plen] = '\0'; 543 convert_delimiter(s, dirsep); 544 return s; 545 } 546 547 /* 548 * Parse a devname into substrings and populate the ctx->UNC and ctx->prepath 549 * fields with the result. Returns 0 on success and an error otherwise 550 * (e.g. ENOMEM or EINVAL) 551 */ 552 int 553 smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx) 554 { 555 char *pos; 556 const char *delims = "/\\"; 557 size_t len; 558 int rc; 559 560 if (unlikely(!devname || !*devname)) { 561 cifs_dbg(VFS, "Device name not specified\n"); 562 return -EINVAL; 563 } 564 565 /* make sure we have a valid UNC double delimiter prefix */ 566 len = strspn(devname, delims); 567 if (len != 2) 568 return -EINVAL; 569 570 /* find delimiter between host and sharename */ 571 pos = strpbrk(devname + 2, delims); 572 if (!pos) 573 return -EINVAL; 574 575 /* record the server hostname */ 576 kfree(ctx->server_hostname); 577 ctx->server_hostname = kstrndup(devname + 2, pos - devname - 2, GFP_KERNEL); 578 if (!ctx->server_hostname) 579 return -ENOMEM; 580 581 /* skip past delimiter */ 582 ++pos; 583 584 /* now go until next delimiter or end of string */ 585 len = strcspn(pos, delims); 586 if (!len) 587 return -EINVAL; 588 589 /* move "pos" up to delimiter or NULL */ 590 pos += len; 591 kfree(ctx->UNC); 592 ctx->UNC = kstrndup(devname, pos - devname, GFP_KERNEL); 593 if (!ctx->UNC) 594 return -ENOMEM; 595 596 convert_delimiter(ctx->UNC, '\\'); 597 598 /* skip any delimiter */ 599 if (*pos == '/' || *pos == '\\') 600 pos++; 601 602 kfree(ctx->prepath); 603 ctx->prepath = NULL; 604 605 /* If pos is NULL then no prepath */ 606 if (!*pos) 607 return 0; 608 609 ctx->prepath = cifs_sanitize_prepath(pos, GFP_KERNEL); 610 if (IS_ERR(ctx->prepath)) { 611 rc = PTR_ERR(ctx->prepath); 612 ctx->prepath = NULL; 613 return rc; 614 } 615 616 return 0; 617 } 618 619 static void smb3_fs_context_free(struct fs_context *fc); 620 static int smb3_fs_context_parse_param(struct fs_context *fc, 621 struct fs_parameter *param); 622 static int smb3_fs_context_parse_monolithic(struct fs_context *fc, 623 void *data); 624 static int smb3_get_tree(struct fs_context *fc); 625 static int smb3_reconfigure(struct fs_context *fc); 626 627 static const struct fs_context_operations smb3_fs_context_ops = { 628 .free = smb3_fs_context_free, 629 .parse_param = smb3_fs_context_parse_param, 630 .parse_monolithic = smb3_fs_context_parse_monolithic, 631 .get_tree = smb3_get_tree, 632 .reconfigure = smb3_reconfigure, 633 }; 634 635 /* 636 * Parse a monolithic block of data from sys_mount(). 637 * smb3_fs_context_parse_monolithic - Parse key[=val][,key[=val]]* mount data 638 * @ctx: The superblock configuration to fill in. 639 * @data: The data to parse 640 * 641 * Parse a blob of data that's in key[=val][,key[=val]]* form. This can be 642 * called from the ->monolithic_mount_data() fs_context operation. 643 * 644 * Returns 0 on success or the error returned by the ->parse_option() fs_context 645 * operation on failure. 646 */ 647 static int smb3_fs_context_parse_monolithic(struct fs_context *fc, 648 void *data) 649 { 650 char *options = data, *key; 651 int ret = 0; 652 653 if (!options) 654 return 0; 655 656 ret = security_sb_eat_lsm_opts(options, &fc->security); 657 if (ret) 658 return ret; 659 660 /* BB Need to add support for sep= here TBD */ 661 while ((key = strsep(&options, ",")) != NULL) { 662 size_t len; 663 char *value; 664 665 if (*key == 0) 666 break; 667 668 /* Check if following character is the deliminator If yes, 669 * we have encountered a double deliminator reset the NULL 670 * character to the deliminator 671 */ 672 while (options && options[0] == ',') { 673 len = strlen(key); 674 strcpy(key + len, options); 675 options = strchr(options, ','); 676 if (options) 677 *options++ = 0; 678 } 679 680 681 len = 0; 682 value = strchr(key, '='); 683 if (value) { 684 if (value == key) 685 continue; 686 *value++ = 0; 687 len = strlen(value); 688 } 689 690 ret = vfs_parse_fs_string(fc, key, value, len); 691 if (ret < 0) 692 break; 693 } 694 695 return ret; 696 } 697 698 /* 699 * Validate the preparsed information in the config. 700 */ 701 static int smb3_fs_context_validate(struct fs_context *fc) 702 { 703 struct smb3_fs_context *ctx = smb3_fc2context(fc); 704 705 if (ctx->rdma && ctx->vals->protocol_id < SMB30_PROT_ID) { 706 cifs_errorf(fc, "SMB Direct requires Version >=3.0\n"); 707 return -EOPNOTSUPP; 708 } 709 710 #ifndef CONFIG_KEYS 711 /* Muliuser mounts require CONFIG_KEYS support */ 712 if (ctx->multiuser) { 713 cifs_errorf(fc, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n"); 714 return -1; 715 } 716 #endif 717 718 if (ctx->got_version == false) 719 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"); 720 721 722 if (!ctx->UNC) { 723 cifs_errorf(fc, "CIFS mount error: No usable UNC path provided in device string!\n"); 724 return -1; 725 } 726 727 /* make sure UNC has a share name */ 728 if (strlen(ctx->UNC) < 3 || !strchr(ctx->UNC + 3, '\\')) { 729 cifs_errorf(fc, "Malformed UNC. Unable to find share name.\n"); 730 return -ENOENT; 731 } 732 733 if (!ctx->got_ip) { 734 int len; 735 const char *slash; 736 737 /* No ip= option specified? Try to get it from UNC */ 738 /* Use the address part of the UNC. */ 739 slash = strchr(&ctx->UNC[2], '\\'); 740 len = slash - &ctx->UNC[2]; 741 if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr, 742 &ctx->UNC[2], len)) { 743 pr_err("Unable to determine destination address\n"); 744 return -EHOSTUNREACH; 745 } 746 } 747 748 /* set the port that we got earlier */ 749 cifs_set_port((struct sockaddr *)&ctx->dstaddr, ctx->port); 750 751 if (ctx->override_uid && !ctx->uid_specified) { 752 ctx->override_uid = 0; 753 pr_notice("ignoring forceuid mount option specified with no uid= option\n"); 754 } 755 756 if (ctx->override_gid && !ctx->gid_specified) { 757 ctx->override_gid = 0; 758 pr_notice("ignoring forcegid mount option specified with no gid= option\n"); 759 } 760 761 return 0; 762 } 763 764 static int smb3_get_tree_common(struct fs_context *fc) 765 { 766 struct smb3_fs_context *ctx = smb3_fc2context(fc); 767 struct dentry *root; 768 int rc = 0; 769 770 root = cifs_smb3_do_mount(fc->fs_type, 0, ctx); 771 if (IS_ERR(root)) 772 return PTR_ERR(root); 773 774 fc->root = root; 775 776 return rc; 777 } 778 779 /* 780 * Create an SMB3 superblock from the parameters passed. 781 */ 782 static int smb3_get_tree(struct fs_context *fc) 783 { 784 int err = smb3_fs_context_validate(fc); 785 int ret; 786 787 if (err) 788 return err; 789 cifs_mount_lock(); 790 ret = smb3_get_tree_common(fc); 791 cifs_mount_unlock(); 792 return ret; 793 } 794 795 static void smb3_fs_context_free(struct fs_context *fc) 796 { 797 struct smb3_fs_context *ctx = smb3_fc2context(fc); 798 799 smb3_cleanup_fs_context(ctx); 800 } 801 802 /* 803 * Compare the old and new proposed context during reconfigure 804 * and check if the changes are compatible. 805 */ 806 static int smb3_verify_reconfigure_ctx(struct fs_context *fc, 807 struct smb3_fs_context *new_ctx, 808 struct smb3_fs_context *old_ctx, bool need_recon) 809 { 810 if (new_ctx->posix_paths != old_ctx->posix_paths) { 811 cifs_errorf(fc, "can not change posixpaths during remount\n"); 812 return -EINVAL; 813 } 814 if (new_ctx->sectype != old_ctx->sectype) { 815 cifs_errorf(fc, "can not change sec during remount\n"); 816 return -EINVAL; 817 } 818 if (new_ctx->multiuser != old_ctx->multiuser) { 819 cifs_errorf(fc, "can not change multiuser during remount\n"); 820 return -EINVAL; 821 } 822 if (new_ctx->UNC && 823 (!old_ctx->UNC || strcmp(new_ctx->UNC, old_ctx->UNC))) { 824 cifs_errorf(fc, "can not change UNC during remount\n"); 825 return -EINVAL; 826 } 827 if (new_ctx->username && 828 (!old_ctx->username || strcmp(new_ctx->username, old_ctx->username))) { 829 cifs_errorf(fc, "can not change username during remount\n"); 830 return -EINVAL; 831 } 832 if (new_ctx->password && 833 (!old_ctx->password || strcmp(new_ctx->password, old_ctx->password))) { 834 if (need_recon == false) { 835 cifs_errorf(fc, 836 "can not change password of active session during remount\n"); 837 return -EINVAL; 838 } else if (old_ctx->sectype == Kerberos) { 839 cifs_errorf(fc, 840 "can not change password for Kerberos via remount\n"); 841 return -EINVAL; 842 } 843 } 844 if (new_ctx->domainname && 845 (!old_ctx->domainname || strcmp(new_ctx->domainname, old_ctx->domainname))) { 846 cifs_errorf(fc, "can not change domainname during remount\n"); 847 return -EINVAL; 848 } 849 if (strcmp(new_ctx->workstation_name, old_ctx->workstation_name)) { 850 cifs_errorf(fc, "can not change workstation_name during remount\n"); 851 return -EINVAL; 852 } 853 if (new_ctx->nodename && 854 (!old_ctx->nodename || strcmp(new_ctx->nodename, old_ctx->nodename))) { 855 cifs_errorf(fc, "can not change nodename during remount\n"); 856 return -EINVAL; 857 } 858 if (new_ctx->iocharset && 859 (!old_ctx->iocharset || strcmp(new_ctx->iocharset, old_ctx->iocharset))) { 860 cifs_errorf(fc, "can not change iocharset during remount\n"); 861 return -EINVAL; 862 } 863 864 return 0; 865 } 866 867 #define STEAL_STRING(cifs_sb, ctx, field) \ 868 do { \ 869 kfree(ctx->field); \ 870 ctx->field = cifs_sb->ctx->field; \ 871 cifs_sb->ctx->field = NULL; \ 872 } while (0) 873 874 #define STEAL_STRING_SENSITIVE(cifs_sb, ctx, field) \ 875 do { \ 876 kfree_sensitive(ctx->field); \ 877 ctx->field = cifs_sb->ctx->field; \ 878 cifs_sb->ctx->field = NULL; \ 879 } while (0) 880 881 static int smb3_reconfigure(struct fs_context *fc) 882 { 883 struct smb3_fs_context *ctx = smb3_fc2context(fc); 884 struct dentry *root = fc->root; 885 struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb); 886 struct cifs_ses *ses = cifs_sb_master_tcon(cifs_sb)->ses; 887 bool need_recon = false; 888 int rc; 889 890 if (ses->expired_pwd) 891 need_recon = true; 892 893 rc = smb3_verify_reconfigure_ctx(fc, ctx, cifs_sb->ctx, need_recon); 894 if (rc) 895 return rc; 896 897 /* 898 * We can not change UNC/username/password/domainname/ 899 * workstation_name/nodename/iocharset 900 * during reconnect so ignore what we have in the new context and 901 * just use what we already have in cifs_sb->ctx. 902 */ 903 STEAL_STRING(cifs_sb, ctx, UNC); 904 STEAL_STRING(cifs_sb, ctx, source); 905 STEAL_STRING(cifs_sb, ctx, username); 906 if (need_recon == false) 907 STEAL_STRING_SENSITIVE(cifs_sb, ctx, password); 908 else { 909 kfree_sensitive(ses->password); 910 ses->password = kstrdup(ctx->password, GFP_KERNEL); 911 kfree_sensitive(ses->password2); 912 ses->password2 = kstrdup(ctx->password2, GFP_KERNEL); 913 } 914 STEAL_STRING(cifs_sb, ctx, domainname); 915 STEAL_STRING(cifs_sb, ctx, nodename); 916 STEAL_STRING(cifs_sb, ctx, iocharset); 917 918 /* if rsize or wsize not passed in on remount, use previous values */ 919 if (ctx->rsize == 0) 920 ctx->rsize = cifs_sb->ctx->rsize; 921 if (ctx->wsize == 0) 922 ctx->wsize = cifs_sb->ctx->wsize; 923 924 925 smb3_cleanup_fs_context_contents(cifs_sb->ctx); 926 rc = smb3_fs_context_dup(cifs_sb->ctx, ctx); 927 smb3_update_mnt_flags(cifs_sb); 928 #ifdef CONFIG_CIFS_DFS_UPCALL 929 if (!rc) 930 rc = dfs_cache_remount_fs(cifs_sb); 931 #endif 932 933 return rc; 934 } 935 936 static int smb3_fs_context_parse_param(struct fs_context *fc, 937 struct fs_parameter *param) 938 { 939 struct fs_parse_result result; 940 struct smb3_fs_context *ctx = smb3_fc2context(fc); 941 int i, opt; 942 bool is_smb3 = !strcmp(fc->fs_type->name, "smb3"); 943 bool skip_parsing = false; 944 kuid_t uid; 945 kgid_t gid; 946 947 cifs_dbg(FYI, "CIFS: parsing cifs mount option '%s'\n", param->key); 948 949 /* 950 * fs_parse can not handle string options with an empty value so 951 * we will need special handling of them. 952 */ 953 if (param->type == fs_value_is_string && param->string[0] == 0) { 954 if (!strcmp("pass", param->key) || !strcmp("password", param->key)) { 955 skip_parsing = true; 956 opt = Opt_pass; 957 } else if (!strcmp("user", param->key) || !strcmp("username", param->key)) { 958 skip_parsing = true; 959 opt = Opt_user; 960 } 961 } 962 963 if (!skip_parsing) { 964 opt = fs_parse(fc, smb3_fs_parameters, param, &result); 965 if (opt < 0) 966 return ctx->sloppy ? 1 : opt; 967 } 968 969 switch (opt) { 970 case Opt_compress: 971 ctx->compress = true; 972 cifs_dbg(VFS, 973 "SMB3 compression support is experimental\n"); 974 break; 975 case Opt_nodfs: 976 ctx->nodfs = 1; 977 break; 978 case Opt_hard: 979 if (result.negated) { 980 if (ctx->retry == 1) 981 cifs_dbg(VFS, "conflicting hard vs. soft mount options\n"); 982 ctx->retry = 0; 983 } else 984 ctx->retry = 1; 985 break; 986 case Opt_soft: 987 if (result.negated) 988 ctx->retry = 1; 989 else { 990 if (ctx->retry == 1) 991 cifs_dbg(VFS, "conflicting hard vs soft mount options\n"); 992 ctx->retry = 0; 993 } 994 break; 995 case Opt_mapposix: 996 if (result.negated) 997 ctx->remap = false; 998 else { 999 ctx->remap = true; 1000 ctx->sfu_remap = false; /* disable SFU mapping */ 1001 } 1002 break; 1003 case Opt_mapchars: 1004 if (result.negated) 1005 ctx->sfu_remap = false; 1006 else { 1007 ctx->sfu_remap = true; 1008 ctx->remap = false; /* disable SFM (mapposix) mapping */ 1009 } 1010 break; 1011 case Opt_user_xattr: 1012 if (result.negated) 1013 ctx->no_xattr = 1; 1014 else 1015 ctx->no_xattr = 0; 1016 break; 1017 case Opt_forceuid: 1018 if (result.negated) 1019 ctx->override_uid = 0; 1020 else 1021 ctx->override_uid = 1; 1022 break; 1023 case Opt_forcegid: 1024 if (result.negated) 1025 ctx->override_gid = 0; 1026 else 1027 ctx->override_gid = 1; 1028 break; 1029 case Opt_perm: 1030 if (result.negated) 1031 ctx->noperm = 1; 1032 else 1033 ctx->noperm = 0; 1034 break; 1035 case Opt_dynperm: 1036 if (result.negated) 1037 ctx->dynperm = 0; 1038 else 1039 ctx->dynperm = 1; 1040 break; 1041 case Opt_sfu: 1042 if (result.negated) 1043 ctx->sfu_emul = 0; 1044 else 1045 ctx->sfu_emul = 1; 1046 break; 1047 case Opt_noblocksend: 1048 ctx->noblocksnd = 1; 1049 break; 1050 case Opt_noautotune: 1051 ctx->noautotune = 1; 1052 break; 1053 case Opt_nolease: 1054 ctx->no_lease = 1; 1055 break; 1056 case Opt_nosparse: 1057 ctx->no_sparse = 1; 1058 break; 1059 case Opt_nodelete: 1060 ctx->nodelete = 1; 1061 break; 1062 case Opt_multichannel: 1063 if (result.negated) { 1064 ctx->multichannel = false; 1065 ctx->max_channels = 1; 1066 } else { 1067 ctx->multichannel = true; 1068 /* if number of channels not specified, default to 2 */ 1069 if (ctx->max_channels < 2) 1070 ctx->max_channels = 2; 1071 } 1072 break; 1073 case Opt_uid: 1074 uid = make_kuid(current_user_ns(), result.uint_32); 1075 if (!uid_valid(uid)) 1076 goto cifs_parse_mount_err; 1077 ctx->linux_uid = uid; 1078 ctx->uid_specified = true; 1079 break; 1080 case Opt_cruid: 1081 uid = make_kuid(current_user_ns(), result.uint_32); 1082 if (!uid_valid(uid)) 1083 goto cifs_parse_mount_err; 1084 ctx->cred_uid = uid; 1085 ctx->cruid_specified = true; 1086 break; 1087 case Opt_backupuid: 1088 uid = make_kuid(current_user_ns(), result.uint_32); 1089 if (!uid_valid(uid)) 1090 goto cifs_parse_mount_err; 1091 ctx->backupuid = uid; 1092 ctx->backupuid_specified = true; 1093 break; 1094 case Opt_backupgid: 1095 gid = make_kgid(current_user_ns(), result.uint_32); 1096 if (!gid_valid(gid)) 1097 goto cifs_parse_mount_err; 1098 ctx->backupgid = gid; 1099 ctx->backupgid_specified = true; 1100 break; 1101 case Opt_gid: 1102 gid = make_kgid(current_user_ns(), result.uint_32); 1103 if (!gid_valid(gid)) 1104 goto cifs_parse_mount_err; 1105 ctx->linux_gid = gid; 1106 ctx->gid_specified = true; 1107 break; 1108 case Opt_port: 1109 ctx->port = result.uint_32; 1110 break; 1111 case Opt_file_mode: 1112 ctx->file_mode = result.uint_32; 1113 break; 1114 case Opt_dirmode: 1115 ctx->dir_mode = result.uint_32; 1116 break; 1117 case Opt_min_enc_offload: 1118 ctx->min_offload = result.uint_32; 1119 break; 1120 case Opt_retrans: 1121 ctx->retrans = result.uint_32; 1122 break; 1123 case Opt_blocksize: 1124 /* 1125 * inode blocksize realistically should never need to be 1126 * less than 16K or greater than 16M and default is 1MB. 1127 * Note that small inode block sizes (e.g. 64K) can lead 1128 * to very poor performance of common tools like cp and scp 1129 */ 1130 if ((result.uint_32 < CIFS_MAX_MSGSIZE) || 1131 (result.uint_32 > (4 * SMB3_DEFAULT_IOSIZE))) { 1132 cifs_errorf(fc, "%s: Invalid blocksize\n", 1133 __func__); 1134 goto cifs_parse_mount_err; 1135 } 1136 ctx->bsize = result.uint_32; 1137 ctx->got_bsize = true; 1138 break; 1139 case Opt_rasize: 1140 /* 1141 * readahead size realistically should never need to be 1142 * less than 1M (CIFS_DEFAULT_IOSIZE) or greater than 32M 1143 * (perhaps an exception should be considered in the 1144 * for the case of a large number of channels 1145 * when multichannel is negotiated) since that would lead 1146 * to plenty of parallel I/O in flight to the server. 1147 * Note that smaller read ahead sizes would 1148 * hurt performance of common tools like cp and scp 1149 * which often trigger sequential i/o with read ahead 1150 */ 1151 if ((result.uint_32 > (8 * SMB3_DEFAULT_IOSIZE)) || 1152 (result.uint_32 < CIFS_DEFAULT_IOSIZE)) { 1153 cifs_errorf(fc, "%s: Invalid rasize %d vs. %d\n", 1154 __func__, result.uint_32, SMB3_DEFAULT_IOSIZE); 1155 goto cifs_parse_mount_err; 1156 } 1157 ctx->rasize = result.uint_32; 1158 break; 1159 case Opt_rsize: 1160 ctx->rsize = result.uint_32; 1161 ctx->got_rsize = true; 1162 break; 1163 case Opt_wsize: 1164 ctx->wsize = result.uint_32; 1165 ctx->got_wsize = true; 1166 if (ctx->wsize % PAGE_SIZE != 0) { 1167 ctx->wsize = round_down(ctx->wsize, PAGE_SIZE); 1168 if (ctx->wsize == 0) { 1169 ctx->wsize = PAGE_SIZE; 1170 cifs_dbg(VFS, "wsize too small, reset to minimum %ld\n", PAGE_SIZE); 1171 } else { 1172 cifs_dbg(VFS, 1173 "wsize rounded down to %d to multiple of PAGE_SIZE %ld\n", 1174 ctx->wsize, PAGE_SIZE); 1175 } 1176 } 1177 break; 1178 case Opt_acregmax: 1179 ctx->acregmax = HZ * result.uint_32; 1180 if (ctx->acregmax > CIFS_MAX_ACTIMEO) { 1181 cifs_errorf(fc, "acregmax too large\n"); 1182 goto cifs_parse_mount_err; 1183 } 1184 break; 1185 case Opt_acdirmax: 1186 ctx->acdirmax = HZ * result.uint_32; 1187 if (ctx->acdirmax > CIFS_MAX_ACTIMEO) { 1188 cifs_errorf(fc, "acdirmax too large\n"); 1189 goto cifs_parse_mount_err; 1190 } 1191 break; 1192 case Opt_actimeo: 1193 if (HZ * result.uint_32 > CIFS_MAX_ACTIMEO) { 1194 cifs_errorf(fc, "timeout too large\n"); 1195 goto cifs_parse_mount_err; 1196 } 1197 if ((ctx->acdirmax != CIFS_DEF_ACTIMEO) || 1198 (ctx->acregmax != CIFS_DEF_ACTIMEO)) { 1199 cifs_errorf(fc, "actimeo ignored since acregmax or acdirmax specified\n"); 1200 break; 1201 } 1202 ctx->acdirmax = ctx->acregmax = HZ * result.uint_32; 1203 break; 1204 case Opt_closetimeo: 1205 ctx->closetimeo = HZ * result.uint_32; 1206 if (ctx->closetimeo > SMB3_MAX_DCLOSETIMEO) { 1207 cifs_errorf(fc, "closetimeo too large\n"); 1208 goto cifs_parse_mount_err; 1209 } 1210 break; 1211 case Opt_echo_interval: 1212 ctx->echo_interval = result.uint_32; 1213 break; 1214 case Opt_snapshot: 1215 ctx->snapshot_time = result.uint_64; 1216 break; 1217 case Opt_max_credits: 1218 if (result.uint_32 < 20 || result.uint_32 > 60000) { 1219 cifs_errorf(fc, "%s: Invalid max_credits value\n", 1220 __func__); 1221 goto cifs_parse_mount_err; 1222 } 1223 ctx->max_credits = result.uint_32; 1224 break; 1225 case Opt_max_channels: 1226 if (result.uint_32 < 1 || result.uint_32 > CIFS_MAX_CHANNELS) { 1227 cifs_errorf(fc, "%s: Invalid max_channels value, needs to be 1-%d\n", 1228 __func__, CIFS_MAX_CHANNELS); 1229 goto cifs_parse_mount_err; 1230 } 1231 ctx->max_channels = result.uint_32; 1232 /* If more than one channel requested ... they want multichan */ 1233 if (result.uint_32 > 1) 1234 ctx->multichannel = true; 1235 break; 1236 case Opt_max_cached_dirs: 1237 if (result.uint_32 < 1) { 1238 cifs_errorf(fc, "%s: Invalid max_cached_dirs, needs to be 1 or more\n", 1239 __func__); 1240 goto cifs_parse_mount_err; 1241 } 1242 ctx->max_cached_dirs = result.uint_32; 1243 break; 1244 case Opt_handletimeout: 1245 ctx->handle_timeout = result.uint_32; 1246 if (ctx->handle_timeout > SMB3_MAX_HANDLE_TIMEOUT) { 1247 cifs_errorf(fc, "Invalid handle cache timeout, longer than 16 minutes\n"); 1248 goto cifs_parse_mount_err; 1249 } 1250 break; 1251 case Opt_source: 1252 kfree(ctx->UNC); 1253 ctx->UNC = NULL; 1254 switch (smb3_parse_devname(param->string, ctx)) { 1255 case 0: 1256 break; 1257 case -ENOMEM: 1258 cifs_errorf(fc, "Unable to allocate memory for devname\n"); 1259 goto cifs_parse_mount_err; 1260 case -EINVAL: 1261 cifs_errorf(fc, "Malformed UNC in devname\n"); 1262 goto cifs_parse_mount_err; 1263 default: 1264 cifs_errorf(fc, "Unknown error parsing devname\n"); 1265 goto cifs_parse_mount_err; 1266 } 1267 ctx->source = smb3_fs_context_fullpath(ctx, '/'); 1268 if (IS_ERR(ctx->source)) { 1269 ctx->source = NULL; 1270 cifs_errorf(fc, "OOM when copying UNC string\n"); 1271 goto cifs_parse_mount_err; 1272 } 1273 fc->source = kstrdup(ctx->source, GFP_KERNEL); 1274 if (fc->source == NULL) { 1275 cifs_errorf(fc, "OOM when copying UNC string\n"); 1276 goto cifs_parse_mount_err; 1277 } 1278 break; 1279 case Opt_user: 1280 kfree(ctx->username); 1281 ctx->username = NULL; 1282 if (ctx->nullauth) 1283 break; 1284 if (strlen(param->string) == 0) { 1285 /* null user, ie. anonymous authentication */ 1286 ctx->nullauth = 1; 1287 break; 1288 } 1289 1290 if (strnlen(param->string, CIFS_MAX_USERNAME_LEN) > 1291 CIFS_MAX_USERNAME_LEN) { 1292 pr_warn("username too long\n"); 1293 goto cifs_parse_mount_err; 1294 } 1295 ctx->username = kstrdup(param->string, GFP_KERNEL); 1296 if (ctx->username == NULL) { 1297 cifs_errorf(fc, "OOM when copying username string\n"); 1298 goto cifs_parse_mount_err; 1299 } 1300 break; 1301 case Opt_pass: 1302 kfree_sensitive(ctx->password); 1303 ctx->password = NULL; 1304 if (strlen(param->string) == 0) 1305 break; 1306 1307 ctx->password = kstrdup(param->string, GFP_KERNEL); 1308 if (ctx->password == NULL) { 1309 cifs_errorf(fc, "OOM when copying password string\n"); 1310 goto cifs_parse_mount_err; 1311 } 1312 break; 1313 case Opt_pass2: 1314 kfree_sensitive(ctx->password2); 1315 ctx->password2 = NULL; 1316 if (strlen(param->string) == 0) 1317 break; 1318 1319 ctx->password2 = kstrdup(param->string, GFP_KERNEL); 1320 if (ctx->password2 == NULL) { 1321 cifs_errorf(fc, "OOM when copying password2 string\n"); 1322 goto cifs_parse_mount_err; 1323 } 1324 break; 1325 case Opt_ip: 1326 if (strlen(param->string) == 0) { 1327 ctx->got_ip = false; 1328 break; 1329 } 1330 if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr, 1331 param->string, 1332 strlen(param->string))) { 1333 pr_err("bad ip= option (%s)\n", param->string); 1334 goto cifs_parse_mount_err; 1335 } 1336 ctx->got_ip = true; 1337 break; 1338 case Opt_domain: 1339 if (strnlen(param->string, CIFS_MAX_DOMAINNAME_LEN) 1340 == CIFS_MAX_DOMAINNAME_LEN) { 1341 pr_warn("domain name too long\n"); 1342 goto cifs_parse_mount_err; 1343 } 1344 1345 kfree(ctx->domainname); 1346 ctx->domainname = kstrdup(param->string, GFP_KERNEL); 1347 if (ctx->domainname == NULL) { 1348 cifs_errorf(fc, "OOM when copying domainname string\n"); 1349 goto cifs_parse_mount_err; 1350 } 1351 cifs_dbg(FYI, "Domain name set\n"); 1352 break; 1353 case Opt_srcaddr: 1354 if (!cifs_convert_address( 1355 (struct sockaddr *)&ctx->srcaddr, 1356 param->string, strlen(param->string))) { 1357 pr_warn("Could not parse srcaddr: %s\n", 1358 param->string); 1359 goto cifs_parse_mount_err; 1360 } 1361 break; 1362 case Opt_iocharset: 1363 if (strnlen(param->string, 1024) >= 65) { 1364 pr_warn("iocharset name too long\n"); 1365 goto cifs_parse_mount_err; 1366 } 1367 1368 if (strncasecmp(param->string, "default", 7) != 0) { 1369 kfree(ctx->iocharset); 1370 ctx->iocharset = kstrdup(param->string, GFP_KERNEL); 1371 if (ctx->iocharset == NULL) { 1372 cifs_errorf(fc, "OOM when copying iocharset string\n"); 1373 goto cifs_parse_mount_err; 1374 } 1375 } 1376 /* if iocharset not set then load_nls_default 1377 * is used by caller 1378 */ 1379 cifs_dbg(FYI, "iocharset set to %s\n", ctx->iocharset); 1380 break; 1381 case Opt_netbiosname: 1382 memset(ctx->source_rfc1001_name, 0x20, 1383 RFC1001_NAME_LEN); 1384 /* 1385 * FIXME: are there cases in which a comma can 1386 * be valid in workstation netbios name (and 1387 * need special handling)? 1388 */ 1389 for (i = 0; i < RFC1001_NAME_LEN; i++) { 1390 /* don't ucase netbiosname for user */ 1391 if (param->string[i] == 0) 1392 break; 1393 ctx->source_rfc1001_name[i] = param->string[i]; 1394 } 1395 /* The string has 16th byte zero still from 1396 * set at top of the function 1397 */ 1398 if (i == RFC1001_NAME_LEN && param->string[i] != 0) 1399 pr_warn("netbiosname longer than 15 truncated\n"); 1400 break; 1401 case Opt_servern: 1402 /* last byte, type, is 0x20 for servr type */ 1403 memset(ctx->target_rfc1001_name, 0x20, 1404 RFC1001_NAME_LEN_WITH_NULL); 1405 /* 1406 * BB are there cases in which a comma can be valid in this 1407 * workstation netbios name (and need special handling)? 1408 */ 1409 1410 /* user or mount helper must uppercase the netbios name */ 1411 for (i = 0; i < 15; i++) { 1412 if (param->string[i] == 0) 1413 break; 1414 ctx->target_rfc1001_name[i] = param->string[i]; 1415 } 1416 1417 /* The string has 16th byte zero still from set at top of function */ 1418 if (i == RFC1001_NAME_LEN && param->string[i] != 0) 1419 pr_warn("server netbiosname longer than 15 truncated\n"); 1420 break; 1421 case Opt_ver: 1422 /* version of mount userspace tools, not dialect */ 1423 /* If interface changes in mount.cifs bump to new ver */ 1424 if (strncasecmp(param->string, "1", 1) == 0) { 1425 if (strlen(param->string) > 1) { 1426 pr_warn("Bad mount helper ver=%s. Did you want SMB1 (CIFS) dialect and mean to type vers=1.0 instead?\n", 1427 param->string); 1428 goto cifs_parse_mount_err; 1429 } 1430 /* This is the default */ 1431 break; 1432 } 1433 /* For all other value, error */ 1434 pr_warn("Invalid mount helper version specified\n"); 1435 goto cifs_parse_mount_err; 1436 case Opt_vers: 1437 /* protocol version (dialect) */ 1438 if (cifs_parse_smb_version(fc, param->string, ctx, is_smb3) != 0) 1439 goto cifs_parse_mount_err; 1440 ctx->got_version = true; 1441 break; 1442 case Opt_sec: 1443 if (cifs_parse_security_flavors(fc, param->string, ctx) != 0) 1444 goto cifs_parse_mount_err; 1445 break; 1446 case Opt_cache: 1447 if (cifs_parse_cache_flavor(fc, param->string, ctx) != 0) 1448 goto cifs_parse_mount_err; 1449 break; 1450 case Opt_witness: 1451 #ifndef CONFIG_CIFS_SWN_UPCALL 1452 cifs_errorf(fc, "Witness support needs CONFIG_CIFS_SWN_UPCALL config option\n"); 1453 goto cifs_parse_mount_err; 1454 #endif 1455 ctx->witness = true; 1456 pr_warn_once("Witness protocol support is experimental\n"); 1457 break; 1458 case Opt_rootfs: 1459 #ifndef CONFIG_CIFS_ROOT 1460 cifs_dbg(VFS, "rootfs support requires CONFIG_CIFS_ROOT config option\n"); 1461 goto cifs_parse_mount_err; 1462 #endif 1463 ctx->rootfs = true; 1464 break; 1465 case Opt_posixpaths: 1466 if (result.negated) 1467 ctx->posix_paths = 0; 1468 else 1469 ctx->posix_paths = 1; 1470 break; 1471 case Opt_unix: 1472 if (result.negated) { 1473 if (ctx->linux_ext == 1) 1474 pr_warn_once("conflicting posix mount options specified\n"); 1475 ctx->linux_ext = 0; 1476 ctx->no_linux_ext = 1; 1477 } else { 1478 if (ctx->no_linux_ext == 1) 1479 pr_warn_once("conflicting posix mount options specified\n"); 1480 ctx->linux_ext = 1; 1481 ctx->no_linux_ext = 0; 1482 } 1483 break; 1484 case Opt_nocase: 1485 ctx->nocase = 1; 1486 break; 1487 case Opt_brl: 1488 if (result.negated) { 1489 /* 1490 * turn off mandatory locking in mode 1491 * if remote locking is turned off since the 1492 * local vfs will do advisory 1493 */ 1494 if (ctx->file_mode == 1495 (S_IALLUGO & ~(S_ISUID | S_IXGRP))) 1496 ctx->file_mode = S_IALLUGO; 1497 ctx->nobrl = 1; 1498 } else 1499 ctx->nobrl = 0; 1500 break; 1501 case Opt_handlecache: 1502 if (result.negated) 1503 ctx->nohandlecache = 1; 1504 else 1505 ctx->nohandlecache = 0; 1506 break; 1507 case Opt_forcemandatorylock: 1508 ctx->mand_lock = 1; 1509 break; 1510 case Opt_setuids: 1511 ctx->setuids = result.negated; 1512 break; 1513 case Opt_intr: 1514 ctx->intr = !result.negated; 1515 break; 1516 case Opt_setuidfromacl: 1517 ctx->setuidfromacl = 1; 1518 break; 1519 case Opt_strictsync: 1520 ctx->nostrictsync = result.negated; 1521 break; 1522 case Opt_serverino: 1523 ctx->server_ino = !result.negated; 1524 break; 1525 case Opt_rwpidforward: 1526 ctx->rwpidforward = 1; 1527 break; 1528 case Opt_modesid: 1529 ctx->mode_ace = 1; 1530 break; 1531 case Opt_cifsacl: 1532 ctx->cifs_acl = !result.negated; 1533 break; 1534 case Opt_acl: 1535 ctx->no_psx_acl = result.negated; 1536 break; 1537 case Opt_locallease: 1538 ctx->local_lease = 1; 1539 break; 1540 case Opt_sign: 1541 ctx->sign = true; 1542 break; 1543 case Opt_ignore_signature: 1544 ctx->sign = true; 1545 ctx->ignore_signature = true; 1546 break; 1547 case Opt_seal: 1548 /* we do not do the following in secFlags because seal 1549 * is a per tree connection (mount) not a per socket 1550 * or per-smb connection option in the protocol 1551 * vol->secFlg |= CIFSSEC_MUST_SEAL; 1552 */ 1553 ctx->seal = 1; 1554 break; 1555 case Opt_noac: 1556 pr_warn("Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n"); 1557 break; 1558 case Opt_fsc: 1559 #ifndef CONFIG_CIFS_FSCACHE 1560 cifs_errorf(fc, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n"); 1561 goto cifs_parse_mount_err; 1562 #endif 1563 ctx->fsc = true; 1564 break; 1565 case Opt_mfsymlinks: 1566 ctx->mfsymlinks = true; 1567 break; 1568 case Opt_multiuser: 1569 ctx->multiuser = true; 1570 break; 1571 case Opt_sloppy: 1572 ctx->sloppy = true; 1573 break; 1574 case Opt_nosharesock: 1575 ctx->nosharesock = true; 1576 break; 1577 case Opt_persistent: 1578 if (result.negated) { 1579 ctx->nopersistent = true; 1580 if (ctx->persistent) { 1581 cifs_errorf(fc, "persistenthandles mount options conflict\n"); 1582 goto cifs_parse_mount_err; 1583 } 1584 } else { 1585 ctx->persistent = true; 1586 if ((ctx->nopersistent) || (ctx->resilient)) { 1587 cifs_errorf(fc, "persistenthandles mount options conflict\n"); 1588 goto cifs_parse_mount_err; 1589 } 1590 } 1591 break; 1592 case Opt_resilient: 1593 if (result.negated) { 1594 ctx->resilient = false; /* already the default */ 1595 } else { 1596 ctx->resilient = true; 1597 if (ctx->persistent) { 1598 cifs_errorf(fc, "persistenthandles mount options conflict\n"); 1599 goto cifs_parse_mount_err; 1600 } 1601 } 1602 break; 1603 case Opt_tcp_nodelay: 1604 /* tcp nodelay should not usually be needed since we CORK/UNCORK the socket */ 1605 if (result.negated) 1606 ctx->sockopt_tcp_nodelay = false; 1607 else 1608 ctx->sockopt_tcp_nodelay = true; 1609 break; 1610 case Opt_domainauto: 1611 ctx->domainauto = true; 1612 break; 1613 case Opt_rdma: 1614 ctx->rdma = true; 1615 break; 1616 case Opt_reparse: 1617 if (parse_reparse_flavor(fc, param->string, ctx)) 1618 goto cifs_parse_mount_err; 1619 break; 1620 } 1621 /* case Opt_ignore: - is ignored as expected ... */ 1622 1623 return 0; 1624 1625 cifs_parse_mount_err: 1626 kfree_sensitive(ctx->password); 1627 ctx->password = NULL; 1628 kfree_sensitive(ctx->password2); 1629 ctx->password2 = NULL; 1630 return -EINVAL; 1631 } 1632 1633 int smb3_init_fs_context(struct fs_context *fc) 1634 { 1635 struct smb3_fs_context *ctx; 1636 char *nodename = utsname()->nodename; 1637 int i; 1638 1639 ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL); 1640 if (unlikely(!ctx)) 1641 return -ENOMEM; 1642 1643 strscpy(ctx->workstation_name, nodename, sizeof(ctx->workstation_name)); 1644 1645 /* 1646 * does not have to be perfect mapping since field is 1647 * informational, only used for servers that do not support 1648 * port 445 and it can be overridden at mount time 1649 */ 1650 memset(ctx->source_rfc1001_name, 0x20, RFC1001_NAME_LEN); 1651 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++) 1652 ctx->source_rfc1001_name[i] = toupper(nodename[i]); 1653 1654 ctx->source_rfc1001_name[RFC1001_NAME_LEN] = 0; 1655 /* 1656 * null target name indicates to use *SMBSERVR default called name 1657 * if we end up sending RFC1001 session initialize 1658 */ 1659 ctx->target_rfc1001_name[0] = 0; 1660 ctx->cred_uid = current_uid(); 1661 ctx->linux_uid = current_uid(); 1662 ctx->linux_gid = current_gid(); 1663 /* By default 4MB read ahead size, 1MB block size */ 1664 ctx->bsize = CIFS_DEFAULT_IOSIZE; /* can improve cp performance significantly */ 1665 ctx->rasize = 0; /* 0 = use default (ie negotiated rsize) for read ahead pages */ 1666 1667 /* 1668 * default to SFM style remapping of seven reserved characters 1669 * unless user overrides it or we negotiate CIFS POSIX where 1670 * it is unnecessary. Can not simultaneously use more than one mapping 1671 * since then readdir could list files that open could not open 1672 */ 1673 ctx->remap = true; 1674 1675 /* default to only allowing write access to owner of the mount */ 1676 ctx->dir_mode = ctx->file_mode = S_IRUGO | S_IXUGO | S_IWUSR; 1677 1678 /* ctx->retry default is 0 (i.e. "soft" limited retry not hard retry) */ 1679 /* default is always to request posix paths. */ 1680 ctx->posix_paths = 1; 1681 /* default to using server inode numbers where available */ 1682 ctx->server_ino = 1; 1683 1684 /* default is to use strict cifs caching semantics */ 1685 ctx->strict_io = true; 1686 1687 ctx->acregmax = CIFS_DEF_ACTIMEO; 1688 ctx->acdirmax = CIFS_DEF_ACTIMEO; 1689 ctx->closetimeo = SMB3_DEF_DCLOSETIMEO; 1690 ctx->max_cached_dirs = MAX_CACHED_FIDS; 1691 /* Most clients set timeout to 0, allows server to use its default */ 1692 ctx->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */ 1693 1694 /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */ 1695 ctx->ops = &smb30_operations; 1696 ctx->vals = &smbdefault_values; 1697 1698 ctx->echo_interval = SMB_ECHO_INTERVAL_DEFAULT; 1699 1700 /* default to no multichannel (single server connection) */ 1701 ctx->multichannel = false; 1702 ctx->max_channels = 1; 1703 1704 ctx->backupuid_specified = false; /* no backup intent for a user */ 1705 ctx->backupgid_specified = false; /* no backup intent for a group */ 1706 1707 ctx->retrans = 1; 1708 ctx->reparse_type = CIFS_REPARSE_TYPE_DEFAULT; 1709 1710 /* 1711 * short int override_uid = -1; 1712 * short int override_gid = -1; 1713 * char *nodename = strdup(utsname()->nodename); 1714 * struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr; 1715 */ 1716 1717 fc->fs_private = ctx; 1718 fc->ops = &smb3_fs_context_ops; 1719 return 0; 1720 } 1721 1722 void 1723 smb3_cleanup_fs_context_contents(struct smb3_fs_context *ctx) 1724 { 1725 if (ctx == NULL) 1726 return; 1727 1728 /* 1729 * Make sure this stays in sync with smb3_fs_context_dup() 1730 */ 1731 kfree(ctx->username); 1732 ctx->username = NULL; 1733 kfree_sensitive(ctx->password); 1734 ctx->password = NULL; 1735 kfree_sensitive(ctx->password2); 1736 ctx->password2 = NULL; 1737 kfree(ctx->server_hostname); 1738 ctx->server_hostname = NULL; 1739 kfree(ctx->UNC); 1740 ctx->UNC = NULL; 1741 kfree(ctx->source); 1742 ctx->source = NULL; 1743 kfree(ctx->domainname); 1744 ctx->domainname = NULL; 1745 kfree(ctx->nodename); 1746 ctx->nodename = NULL; 1747 kfree(ctx->iocharset); 1748 ctx->iocharset = NULL; 1749 kfree(ctx->prepath); 1750 ctx->prepath = NULL; 1751 kfree(ctx->leaf_fullpath); 1752 ctx->leaf_fullpath = NULL; 1753 } 1754 1755 void 1756 smb3_cleanup_fs_context(struct smb3_fs_context *ctx) 1757 { 1758 if (!ctx) 1759 return; 1760 smb3_cleanup_fs_context_contents(ctx); 1761 kfree(ctx); 1762 } 1763 1764 void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb) 1765 { 1766 struct smb3_fs_context *ctx = cifs_sb->ctx; 1767 1768 if (ctx->nodfs) 1769 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_DFS; 1770 else 1771 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_DFS; 1772 1773 if (ctx->noperm) 1774 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM; 1775 else 1776 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_PERM; 1777 1778 if (ctx->setuids) 1779 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID; 1780 else 1781 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SET_UID; 1782 1783 if (ctx->setuidfromacl) 1784 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL; 1785 else 1786 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_UID_FROM_ACL; 1787 1788 if (ctx->server_ino) 1789 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM; 1790 else 1791 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; 1792 1793 if (ctx->remap) 1794 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR; 1795 else 1796 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MAP_SFM_CHR; 1797 1798 if (ctx->sfu_remap) 1799 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR; 1800 else 1801 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MAP_SPECIAL_CHR; 1802 1803 if (ctx->no_xattr) 1804 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR; 1805 else 1806 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_XATTR; 1807 1808 if (ctx->sfu_emul) 1809 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL; 1810 else 1811 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_UNX_EMUL; 1812 1813 if (ctx->nobrl) 1814 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL; 1815 else 1816 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_BRL; 1817 1818 if (ctx->nohandlecache) 1819 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_HANDLE_CACHE; 1820 else 1821 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NO_HANDLE_CACHE; 1822 1823 if (ctx->nostrictsync) 1824 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC; 1825 else 1826 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NOSSYNC; 1827 1828 if (ctx->mand_lock) 1829 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL; 1830 else 1831 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_NOPOSIXBRL; 1832 1833 if (ctx->rwpidforward) 1834 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD; 1835 else 1836 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_RWPIDFORWARD; 1837 1838 if (ctx->mode_ace) 1839 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MODE_FROM_SID; 1840 else 1841 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MODE_FROM_SID; 1842 1843 if (ctx->cifs_acl) 1844 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL; 1845 else 1846 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_ACL; 1847 1848 if (ctx->backupuid_specified) 1849 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID; 1850 else 1851 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_BACKUPUID; 1852 1853 if (ctx->backupgid_specified) 1854 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID; 1855 else 1856 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_CIFS_BACKUPGID; 1857 1858 if (ctx->override_uid) 1859 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID; 1860 else 1861 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_OVERR_UID; 1862 1863 if (ctx->override_gid) 1864 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID; 1865 else 1866 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_OVERR_GID; 1867 1868 if (ctx->dynperm) 1869 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM; 1870 else 1871 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_DYNPERM; 1872 1873 if (ctx->fsc) 1874 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE; 1875 else 1876 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_FSCACHE; 1877 1878 if (ctx->multiuser) 1879 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER | 1880 CIFS_MOUNT_NO_PERM); 1881 else 1882 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MULTIUSER; 1883 1884 1885 if (ctx->strict_io) 1886 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO; 1887 else 1888 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_STRICT_IO; 1889 1890 if (ctx->direct_io) 1891 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO; 1892 else 1893 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_DIRECT_IO; 1894 1895 if (ctx->mfsymlinks) 1896 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS; 1897 else 1898 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_MF_SYMLINKS; 1899 if (ctx->mfsymlinks) { 1900 if (ctx->sfu_emul) { 1901 /* 1902 * Our SFU ("Services for Unix" emulation does not allow 1903 * creating symlinks but does allow reading existing SFU 1904 * symlinks (it does allow both creating and reading SFU 1905 * style mknod and FIFOs though). When "mfsymlinks" and 1906 * "sfu" are both enabled at the same time, it allows 1907 * reading both types of symlinks, but will only create 1908 * them with mfsymlinks format. This allows better 1909 * Apple compatibility (probably better for Samba too) 1910 * while still recognizing old Windows style symlinks. 1911 */ 1912 cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n"); 1913 } 1914 } 1915 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SHUTDOWN; 1916 1917 return; 1918 } 1919