1 // SPDX-License-Identifier: LGPL-2.1 2 /* 3 * 4 * Copyright (C) International Business Machines Corp., 2002,2008 5 * Author(s): Steve French (sfrench@us.ibm.com) 6 * 7 */ 8 9 #include <linux/slab.h> 10 #include <linux/ctype.h> 11 #include <linux/mempool.h> 12 #include <linux/vmalloc.h> 13 #include "cifsglob.h" 14 #include "cifsproto.h" 15 #include "cifs_debug.h" 16 #include "smberr.h" 17 #include "nterr.h" 18 #include "cifs_unicode.h" 19 #include "smb2pdu.h" 20 #include "smb2proto.h" 21 #include "smb1proto.h" 22 #include "cifsfs.h" 23 #ifdef CONFIG_CIFS_DFS_UPCALL 24 #include "dns_resolve.h" 25 #include "dfs_cache.h" 26 #include "dfs.h" 27 #endif 28 #include "fs_context.h" 29 #include "cached_dir.h" 30 31 struct tcon_list { 32 struct list_head entry; 33 struct cifs_tcon *tcon; 34 }; 35 36 /* The xid serves as a useful identifier for each incoming vfs request, 37 in a similar way to the mid which is useful to track each sent smb, 38 and CurrentXid can also provide a running counter (although it 39 will eventually wrap past zero) of the total vfs operations handled 40 since the cifs fs was mounted */ 41 42 unsigned int 43 _get_xid(void) 44 { 45 unsigned int xid; 46 47 spin_lock(&GlobalMid_Lock); 48 GlobalTotalActiveXid++; 49 50 /* keep high water mark for number of simultaneous ops in filesystem */ 51 if (GlobalTotalActiveXid > GlobalMaxActiveXid) 52 GlobalMaxActiveXid = GlobalTotalActiveXid; 53 if (GlobalTotalActiveXid > 65000) 54 cifs_dbg(FYI, "warning: more than 65000 requests active\n"); 55 xid = GlobalCurrentXid++; 56 spin_unlock(&GlobalMid_Lock); 57 return xid; 58 } 59 60 void 61 _free_xid(unsigned int xid) 62 { 63 spin_lock(&GlobalMid_Lock); 64 /* if (GlobalTotalActiveXid == 0) 65 BUG(); */ 66 GlobalTotalActiveXid--; 67 spin_unlock(&GlobalMid_Lock); 68 } 69 70 struct cifs_ses * 71 sesInfoAlloc(void) 72 { 73 struct cifs_ses *ret_buf; 74 75 ret_buf = kzalloc_obj(struct cifs_ses); 76 if (ret_buf) { 77 atomic_inc(&sesInfoAllocCount); 78 spin_lock_init(&ret_buf->ses_lock); 79 ret_buf->ses_status = SES_NEW; 80 ++ret_buf->ses_count; 81 INIT_LIST_HEAD(&ret_buf->smb_ses_list); 82 INIT_LIST_HEAD(&ret_buf->tcon_list); 83 mutex_init(&ret_buf->session_mutex); 84 spin_lock_init(&ret_buf->iface_lock); 85 INIT_LIST_HEAD(&ret_buf->iface_list); 86 spin_lock_init(&ret_buf->chan_lock); 87 } 88 return ret_buf; 89 } 90 91 void 92 sesInfoFree(struct cifs_ses *buf_to_free) 93 { 94 struct cifs_server_iface *iface = NULL, *niface = NULL; 95 96 if (buf_to_free == NULL) { 97 cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n"); 98 return; 99 } 100 101 unload_nls(buf_to_free->local_nls); 102 atomic_dec(&sesInfoAllocCount); 103 kfree(buf_to_free->serverOS); 104 kfree(buf_to_free->serverDomain); 105 kfree(buf_to_free->serverNOS); 106 kfree_sensitive(buf_to_free->password); 107 kfree_sensitive(buf_to_free->password2); 108 kfree(buf_to_free->user_name); 109 kfree(buf_to_free->domainName); 110 kfree(buf_to_free->dns_dom); 111 kfree_sensitive(buf_to_free->auth_key.response); 112 spin_lock(&buf_to_free->iface_lock); 113 list_for_each_entry_safe(iface, niface, &buf_to_free->iface_list, 114 iface_head) 115 kref_put(&iface->refcount, release_iface); 116 spin_unlock(&buf_to_free->iface_lock); 117 kfree_sensitive(buf_to_free); 118 } 119 120 struct cifs_tcon * 121 tcon_info_alloc(bool dir_leases_enabled, enum smb3_tcon_ref_trace trace) 122 { 123 struct cifs_tcon *ret_buf; 124 static atomic_t tcon_debug_id; 125 126 ret_buf = kzalloc_obj(*ret_buf); 127 if (!ret_buf) 128 return NULL; 129 130 if (dir_leases_enabled == true) { 131 ret_buf->cfids = init_cached_dirs(); 132 if (!ret_buf->cfids) { 133 kfree(ret_buf); 134 return NULL; 135 } 136 } 137 /* else ret_buf->cfids is already set to NULL above */ 138 139 atomic_inc(&tconInfoAllocCount); 140 ret_buf->status = TID_NEW; 141 ret_buf->debug_id = atomic_inc_return(&tcon_debug_id); 142 ret_buf->tc_count = 1; 143 spin_lock_init(&ret_buf->tc_lock); 144 INIT_LIST_HEAD(&ret_buf->openFileList); 145 INIT_LIST_HEAD(&ret_buf->tcon_list); 146 INIT_LIST_HEAD(&ret_buf->cifs_sb_list); 147 spin_lock_init(&ret_buf->open_file_lock); 148 spin_lock_init(&ret_buf->stat_lock); 149 spin_lock_init(&ret_buf->sb_list_lock); 150 atomic_set(&ret_buf->num_local_opens, 0); 151 atomic_set(&ret_buf->num_remote_opens, 0); 152 ret_buf->stats_from_time = ktime_get_real_seconds(); 153 #ifdef CONFIG_CIFS_FSCACHE 154 mutex_init(&ret_buf->fscache_lock); 155 #endif 156 trace_smb3_tcon_ref(ret_buf->debug_id, ret_buf->tc_count, trace); 157 #ifdef CONFIG_CIFS_DFS_UPCALL 158 INIT_LIST_HEAD(&ret_buf->dfs_ses_list); 159 #endif 160 INIT_LIST_HEAD(&ret_buf->pending_opens); 161 INIT_DELAYED_WORK(&ret_buf->query_interfaces, 162 smb2_query_server_interfaces); 163 #ifdef CONFIG_CIFS_DFS_UPCALL 164 INIT_DELAYED_WORK(&ret_buf->dfs_cache_work, dfs_cache_refresh); 165 #endif 166 167 return ret_buf; 168 } 169 170 void 171 tconInfoFree(struct cifs_tcon *tcon, enum smb3_tcon_ref_trace trace) 172 { 173 if (tcon == NULL) { 174 cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n"); 175 return; 176 } 177 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count, trace); 178 free_cached_dirs(tcon->cfids); 179 atomic_dec(&tconInfoAllocCount); 180 kfree(tcon->nativeFileSystem); 181 kfree_sensitive(tcon->password); 182 kfree(tcon->origin_fullpath); 183 kfree(tcon); 184 } 185 186 void * 187 cifs_buf_get(void) 188 { 189 void *ret_buf = NULL; 190 /* 191 * SMB2 header is bigger than CIFS one - no problems to clean some 192 * more bytes for CIFS. 193 */ 194 size_t buf_size = sizeof(struct smb2_hdr); 195 196 /* 197 * We could use negotiated size instead of max_msgsize - 198 * but it may be more efficient to always alloc same size 199 * albeit slightly larger than necessary and maxbuffersize 200 * defaults to this and can not be bigger. 201 */ 202 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); 203 204 /* clear the first few header bytes */ 205 /* for most paths, more is cleared in header_assemble */ 206 memset(ret_buf, 0, buf_size + 3); 207 atomic_inc(&buf_alloc_count); 208 #ifdef CONFIG_CIFS_STATS2 209 atomic_inc(&total_buf_alloc_count); 210 #endif /* CONFIG_CIFS_STATS2 */ 211 212 return ret_buf; 213 } 214 215 void 216 cifs_buf_release(void *buf_to_free) 217 { 218 if (buf_to_free == NULL) { 219 /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/ 220 return; 221 } 222 mempool_free(buf_to_free, cifs_req_poolp); 223 224 atomic_dec(&buf_alloc_count); 225 return; 226 } 227 228 void * 229 cifs_small_buf_get(void) 230 { 231 void *ret_buf = NULL; 232 233 /* We could use negotiated size instead of max_msgsize - 234 but it may be more efficient to always alloc same size 235 albeit slightly larger than necessary and maxbuffersize 236 defaults to this and can not be bigger */ 237 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); 238 /* No need to clear memory here, cleared in header assemble */ 239 atomic_inc(&small_buf_alloc_count); 240 #ifdef CONFIG_CIFS_STATS2 241 atomic_inc(&total_small_buf_alloc_count); 242 #endif /* CONFIG_CIFS_STATS2 */ 243 244 return ret_buf; 245 } 246 247 void 248 cifs_small_buf_release(void *buf_to_free) 249 { 250 251 if (buf_to_free == NULL) { 252 cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n"); 253 return; 254 } 255 mempool_free(buf_to_free, cifs_sm_req_poolp); 256 257 atomic_dec(&small_buf_alloc_count); 258 return; 259 } 260 261 void 262 free_rsp_buf(int resp_buftype, void *rsp) 263 { 264 if (resp_buftype == CIFS_SMALL_BUFFER) 265 cifs_small_buf_release(rsp); 266 else if (resp_buftype == CIFS_LARGE_BUFFER) 267 cifs_buf_release(rsp); 268 } 269 270 void 271 dump_smb(void *buf, int smb_buf_length) 272 { 273 if (traceSMB == 0) 274 return; 275 276 print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf, 277 smb_buf_length, true); 278 } 279 280 void 281 cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb, const char *reason, int rc) 282 { 283 unsigned int sbflags = cifs_sb_flags(cifs_sb); 284 285 if (sbflags & CIFS_MOUNT_SERVER_INUM) { 286 struct cifs_tcon *tcon = NULL; 287 288 if (cifs_sb->master_tlink) 289 tcon = cifs_sb_master_tcon(cifs_sb); 290 291 atomic_andnot(CIFS_MOUNT_SERVER_INUM, &cifs_sb->mnt_cifs_flags); 292 cifs_sb->mnt_cifs_serverino_autodisabled = true; 293 if (rc) 294 cifs_dbg(VFS, "%s: %d\n", reason, rc); 295 else 296 cifs_dbg(VFS, "%s\n", reason); 297 cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s\n", 298 tcon ? tcon->tree_name : "new server"); 299 cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS)\n"); 300 cifs_dbg(VFS, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n"); 301 302 } 303 } 304 305 void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) 306 { 307 oplock &= 0xF; 308 309 if (oplock == OPLOCK_EXCLUSIVE) { 310 cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG; 311 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n", 312 &cinode->netfs.inode); 313 } else if (oplock == OPLOCK_READ) { 314 cinode->oplock = CIFS_CACHE_READ_FLG; 315 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n", 316 &cinode->netfs.inode); 317 } else 318 cinode->oplock = 0; 319 } 320 321 /* 322 * We wait for oplock breaks to be processed before we attempt to perform 323 * writes. 324 */ 325 int cifs_get_writer(struct cifsInodeInfo *cinode) 326 { 327 int rc; 328 329 start: 330 rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK, 331 TASK_KILLABLE); 332 if (rc) 333 return rc; 334 335 spin_lock(&cinode->writers_lock); 336 if (!cinode->writers) 337 set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); 338 cinode->writers++; 339 /* Check to see if we have started servicing an oplock break */ 340 if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) { 341 cinode->writers--; 342 if (cinode->writers == 0) { 343 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); 344 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); 345 } 346 spin_unlock(&cinode->writers_lock); 347 goto start; 348 } 349 spin_unlock(&cinode->writers_lock); 350 return 0; 351 } 352 353 void cifs_put_writer(struct cifsInodeInfo *cinode) 354 { 355 spin_lock(&cinode->writers_lock); 356 cinode->writers--; 357 if (cinode->writers == 0) { 358 clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); 359 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); 360 } 361 spin_unlock(&cinode->writers_lock); 362 } 363 364 /** 365 * cifs_queue_oplock_break - queue the oplock break handler for cfile 366 * @cfile: The file to break the oplock on 367 * 368 * This function is called from the demultiplex thread when it 369 * receives an oplock break for @cfile. 370 * 371 * Assumes the tcon->open_file_lock is held. 372 * Assumes cfile->file_info_lock is NOT held. 373 */ 374 void cifs_queue_oplock_break(struct cifsFileInfo *cfile) 375 { 376 /* 377 * Bump the handle refcount now while we hold the 378 * open_file_lock to enforce the validity of it for the oplock 379 * break handler. The matching put is done at the end of the 380 * handler. 381 * 382 * Only take a reference if the work is actually queued. 383 */ 384 if (queue_work(cifsoplockd_wq, &cfile->oplock_break)) 385 cifsFileInfo_get(cfile); 386 } 387 388 void cifs_done_oplock_break(struct cifsInodeInfo *cinode) 389 { 390 clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); 391 wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK); 392 } 393 394 bool 395 backup_cred(struct cifs_sb_info *cifs_sb) 396 { 397 unsigned int sbflags = cifs_sb_flags(cifs_sb); 398 399 if (sbflags & CIFS_MOUNT_CIFS_BACKUPUID) { 400 if (uid_eq(cifs_sb->ctx->backupuid, current_fsuid())) 401 return true; 402 } 403 if (sbflags & CIFS_MOUNT_CIFS_BACKUPGID) { 404 if (in_group_p(cifs_sb->ctx->backupgid)) 405 return true; 406 } 407 408 return false; 409 } 410 411 void 412 cifs_del_pending_open(struct cifs_pending_open *open) 413 { 414 spin_lock(&tlink_tcon(open->tlink)->open_file_lock); 415 list_del(&open->olist); 416 spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); 417 } 418 419 void 420 cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, 421 struct cifs_pending_open *open) 422 { 423 memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE); 424 open->oplock = CIFS_OPLOCK_NO_CHANGE; 425 open->tlink = tlink; 426 fid->pending_open = open; 427 list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens); 428 } 429 430 void 431 cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, 432 struct cifs_pending_open *open) 433 { 434 spin_lock(&tlink_tcon(tlink)->open_file_lock); 435 cifs_add_pending_open_locked(fid, tlink, open); 436 spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); 437 } 438 439 /* 440 * Critical section which runs after acquiring deferred_lock. 441 * As there is no reference count on cifs_deferred_close, pdclose 442 * should not be used outside deferred_lock. 443 */ 444 bool 445 cifs_is_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close **pdclose) 446 { 447 struct cifs_deferred_close *dclose; 448 449 list_for_each_entry(dclose, &CIFS_I(d_inode(cfile->dentry))->deferred_closes, dlist) { 450 if ((dclose->netfid == cfile->fid.netfid) && 451 (dclose->persistent_fid == cfile->fid.persistent_fid) && 452 (dclose->volatile_fid == cfile->fid.volatile_fid)) { 453 *pdclose = dclose; 454 return true; 455 } 456 } 457 return false; 458 } 459 460 /* 461 * Critical section which runs after acquiring deferred_lock. 462 */ 463 void 464 cifs_add_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close *dclose) 465 { 466 bool is_deferred = false; 467 struct cifs_deferred_close *pdclose; 468 469 is_deferred = cifs_is_deferred_close(cfile, &pdclose); 470 if (is_deferred) { 471 kfree(dclose); 472 return; 473 } 474 475 dclose->tlink = cfile->tlink; 476 dclose->netfid = cfile->fid.netfid; 477 dclose->persistent_fid = cfile->fid.persistent_fid; 478 dclose->volatile_fid = cfile->fid.volatile_fid; 479 list_add_tail(&dclose->dlist, &CIFS_I(d_inode(cfile->dentry))->deferred_closes); 480 } 481 482 /* 483 * Critical section which runs after acquiring deferred_lock. 484 */ 485 void 486 cifs_del_deferred_close(struct cifsFileInfo *cfile) 487 { 488 bool is_deferred = false; 489 struct cifs_deferred_close *dclose; 490 491 is_deferred = cifs_is_deferred_close(cfile, &dclose); 492 if (!is_deferred) 493 return; 494 list_del(&dclose->dlist); 495 kfree(dclose); 496 } 497 498 void 499 cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode) 500 { 501 struct cifsFileInfo *cfile = NULL, *failed_cfile = NULL; 502 struct file_list *tmp_list, *tmp_next_list; 503 LIST_HEAD(file_head); 504 505 if (cifs_inode == NULL) 506 return; 507 508 spin_lock(&cifs_inode->open_file_lock); 509 list_for_each_entry(cfile, &cifs_inode->openFileList, flist) { 510 if (delayed_work_pending(&cfile->deferred)) { 511 if (cancel_delayed_work(&cfile->deferred)) { 512 spin_lock(&cifs_inode->deferred_lock); 513 cifs_del_deferred_close(cfile); 514 spin_unlock(&cifs_inode->deferred_lock); 515 516 tmp_list = kmalloc_obj(struct file_list, 517 GFP_ATOMIC); 518 if (tmp_list == NULL) { 519 failed_cfile = cfile; 520 break; 521 } 522 tmp_list->cfile = cfile; 523 list_add_tail(&tmp_list->list, &file_head); 524 } 525 } 526 } 527 spin_unlock(&cifs_inode->open_file_lock); 528 529 if (failed_cfile) 530 _cifsFileInfo_put(failed_cfile, false, false); 531 532 list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) { 533 _cifsFileInfo_put(tmp_list->cfile, false, false); 534 list_del(&tmp_list->list); 535 kfree(tmp_list); 536 } 537 } 538 539 void 540 cifs_close_all_deferred_files(struct cifs_tcon *tcon) 541 { 542 struct cifsFileInfo *cfile, *failed_cfile = NULL; 543 struct file_list *tmp_list, *tmp_next_list; 544 LIST_HEAD(file_head); 545 546 spin_lock(&tcon->open_file_lock); 547 list_for_each_entry(cfile, &tcon->openFileList, tlist) { 548 if (delayed_work_pending(&cfile->deferred)) { 549 if (cancel_delayed_work(&cfile->deferred)) { 550 spin_lock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); 551 cifs_del_deferred_close(cfile); 552 spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); 553 554 tmp_list = kmalloc_obj(struct file_list, 555 GFP_ATOMIC); 556 if (tmp_list == NULL) { 557 failed_cfile = cfile; 558 break; 559 } 560 tmp_list->cfile = cfile; 561 list_add_tail(&tmp_list->list, &file_head); 562 } 563 } 564 } 565 spin_unlock(&tcon->open_file_lock); 566 567 if (failed_cfile) 568 _cifsFileInfo_put(failed_cfile, true, false); 569 570 list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) { 571 _cifsFileInfo_put(tmp_list->cfile, true, false); 572 list_del(&tmp_list->list); 573 kfree(tmp_list); 574 } 575 } 576 577 void cifs_close_all_deferred_files_sb(struct cifs_sb_info *cifs_sb) 578 { 579 struct rb_root *root = &cifs_sb->tlink_tree; 580 struct rb_node *node; 581 struct cifs_tcon *tcon; 582 struct tcon_link *tlink; 583 struct tcon_list *tmp_list, *q; 584 LIST_HEAD(tcon_head); 585 586 spin_lock(&cifs_sb->tlink_tree_lock); 587 for (node = rb_first(root); node; node = rb_next(node)) { 588 tlink = rb_entry(node, struct tcon_link, tl_rbnode); 589 tcon = tlink_tcon(tlink); 590 if (IS_ERR(tcon)) 591 continue; 592 tmp_list = kmalloc_obj(struct tcon_list, GFP_ATOMIC); 593 if (tmp_list == NULL) 594 break; 595 tmp_list->tcon = tcon; 596 /* Take a reference on tcon to prevent it from being freed */ 597 spin_lock(&tcon->tc_lock); 598 ++tcon->tc_count; 599 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count, 600 netfs_trace_tcon_ref_get_close_defer_files); 601 spin_unlock(&tcon->tc_lock); 602 list_add_tail(&tmp_list->entry, &tcon_head); 603 } 604 spin_unlock(&cifs_sb->tlink_tree_lock); 605 606 list_for_each_entry_safe(tmp_list, q, &tcon_head, entry) { 607 cifs_close_all_deferred_files(tmp_list->tcon); 608 list_del(&tmp_list->entry); 609 cifs_put_tcon(tmp_list->tcon, netfs_trace_tcon_ref_put_close_defer_files); 610 kfree(tmp_list); 611 } 612 } 613 614 void cifs_close_deferred_file_under_dentry(struct cifs_tcon *tcon, 615 struct dentry *dentry) 616 { 617 struct file_list *tmp_list, *tmp_next_list; 618 struct cifsFileInfo *cfile, *failed_cfile = NULL; 619 LIST_HEAD(file_head); 620 621 spin_lock(&tcon->open_file_lock); 622 list_for_each_entry(cfile, &tcon->openFileList, tlist) { 623 if ((cfile->dentry == dentry) && 624 delayed_work_pending(&cfile->deferred) && 625 cancel_delayed_work(&cfile->deferred)) { 626 spin_lock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); 627 cifs_del_deferred_close(cfile); 628 spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); 629 630 tmp_list = kmalloc_obj(struct file_list, GFP_ATOMIC); 631 if (tmp_list == NULL) { 632 failed_cfile = cfile; 633 break; 634 } 635 tmp_list->cfile = cfile; 636 list_add_tail(&tmp_list->list, &file_head); 637 } 638 } 639 spin_unlock(&tcon->open_file_lock); 640 641 if (failed_cfile) 642 _cifsFileInfo_put(failed_cfile, true, false); 643 644 list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) { 645 _cifsFileInfo_put(tmp_list->cfile, true, false); 646 list_del(&tmp_list->list); 647 kfree(tmp_list); 648 } 649 } 650 651 /* 652 * If a dentry has been deleted, all corresponding open handles should know that 653 * so that we do not defer close them. 654 */ 655 void cifs_mark_open_handles_for_deleted_file(struct inode *inode, 656 const char *path) 657 { 658 struct cifsFileInfo *cfile; 659 void *page; 660 const char *full_path; 661 struct cifsInodeInfo *cinode = CIFS_I(inode); 662 663 page = alloc_dentry_path(); 664 spin_lock(&cinode->open_file_lock); 665 666 /* 667 * note: we need to construct path from dentry and compare only if the 668 * inode has any hardlinks. When number of hardlinks is 1, we can just 669 * mark all open handles since they are going to be from the same file. 670 */ 671 if (inode->i_nlink > 1) { 672 list_for_each_entry(cfile, &cinode->openFileList, flist) { 673 full_path = build_path_from_dentry(cfile->dentry, page); 674 if (!IS_ERR(full_path) && strcmp(full_path, path) == 0) 675 cfile->status_file_deleted = true; 676 } 677 } else { 678 list_for_each_entry(cfile, &cinode->openFileList, flist) 679 cfile->status_file_deleted = true; 680 } 681 spin_unlock(&cinode->open_file_lock); 682 free_dentry_path(page); 683 } 684 685 /* parses DFS referral V3 structure 686 * caller is responsible for freeing target_nodes 687 * returns: 688 * - on success - 0 689 * - on failure - errno 690 */ 691 int 692 parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size, 693 unsigned int *num_of_nodes, 694 struct dfs_info3_param **target_nodes, 695 const struct nls_table *nls_codepage, int remap, 696 const char *searchName, bool is_unicode) 697 { 698 int i, rc = 0; 699 char *data_end; 700 struct dfs_referral_level_3 *ref; 701 unsigned int path_consumed; 702 size_t search_name_len; 703 704 if (rsp_size < sizeof(*rsp)) { 705 cifs_dbg(VFS | ONCE, 706 "%s: header is malformed (size is %u, must be %zu)\n", 707 __func__, rsp_size, sizeof(*rsp)); 708 rc = -EINVAL; 709 goto parse_DFS_referrals_exit; 710 } 711 712 *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals); 713 714 if (*num_of_nodes < 1) { 715 cifs_dbg(VFS | ONCE, "%s: [path=%s] num_referrals must be at least > 0, but we got %d\n", 716 __func__, searchName, *num_of_nodes); 717 rc = -ENOENT; 718 goto parse_DFS_referrals_exit; 719 } 720 721 if (sizeof(*rsp) + *num_of_nodes * sizeof(REFERRAL3) > rsp_size) { 722 cifs_dbg(VFS | ONCE, 723 "%s: malformed buffer (size is %u, must be at least %zu)\n", 724 __func__, rsp_size, 725 sizeof(*rsp) + *num_of_nodes * sizeof(REFERRAL3)); 726 rc = -EINVAL; 727 goto parse_DFS_referrals_exit; 728 } 729 730 ref = (struct dfs_referral_level_3 *) &(rsp->referrals); 731 if (ref->VersionNumber != cpu_to_le16(3)) { 732 cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n", 733 le16_to_cpu(ref->VersionNumber)); 734 rc = -EINVAL; 735 goto parse_DFS_referrals_exit; 736 } 737 738 /* get the upper boundary of the resp buffer */ 739 data_end = (char *)rsp + rsp_size; 740 741 cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n", 742 *num_of_nodes, le32_to_cpu(rsp->DFSFlags)); 743 744 *target_nodes = kzalloc_objs(struct dfs_info3_param, *num_of_nodes); 745 if (*target_nodes == NULL) { 746 rc = -ENOMEM; 747 goto parse_DFS_referrals_exit; 748 } 749 search_name_len = strlen(searchName); 750 751 /* collect necessary data from referrals */ 752 for (i = 0; i < *num_of_nodes; i++) { 753 char *temp; 754 int max_len; 755 struct dfs_info3_param *node = (*target_nodes)+i; 756 757 node->flags = le32_to_cpu(rsp->DFSFlags); 758 path_consumed = le16_to_cpu(rsp->PathConsumed); 759 if (is_unicode) { 760 size_t search_name_utf16_len = search_name_len * 2 + 2; 761 __le16 *tmp; 762 763 if (path_consumed > search_name_utf16_len) { 764 rc = -EINVAL; 765 goto parse_DFS_referrals_exit; 766 } 767 768 tmp = kmalloc(search_name_utf16_len, GFP_KERNEL); 769 if (!tmp) { 770 rc = -ENOMEM; 771 goto parse_DFS_referrals_exit; 772 } 773 cifsConvertToUTF16((__le16 *)tmp, searchName, 774 PATH_MAX, nls_codepage, remap); 775 node->path_consumed = cifs_utf16_bytes(tmp, path_consumed, 776 nls_codepage); 777 kfree(tmp); 778 } else { 779 if (path_consumed > search_name_len) { 780 rc = -EINVAL; 781 goto parse_DFS_referrals_exit; 782 } 783 784 node->path_consumed = path_consumed; 785 } 786 787 node->server_type = le16_to_cpu(ref->ServerType); 788 node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); 789 790 /* copy DfsPath */ 791 if (le16_to_cpu(ref->DfsPathOffset) > data_end - (char *)ref) { 792 rc = -EINVAL; 793 goto parse_DFS_referrals_exit; 794 } 795 temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset); 796 max_len = data_end - temp; 797 node->path_name = cifs_strndup_from_utf16(temp, max_len, 798 is_unicode, nls_codepage); 799 if (!node->path_name) { 800 rc = -ENOMEM; 801 goto parse_DFS_referrals_exit; 802 } 803 804 /* copy link target UNC */ 805 if (le16_to_cpu(ref->NetworkAddressOffset) > data_end - (char *)ref) { 806 rc = -EINVAL; 807 goto parse_DFS_referrals_exit; 808 } 809 temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset); 810 max_len = data_end - temp; 811 node->node_name = cifs_strndup_from_utf16(temp, max_len, 812 is_unicode, nls_codepage); 813 if (!node->node_name) { 814 rc = -ENOMEM; 815 goto parse_DFS_referrals_exit; 816 } 817 818 node->ttl = le32_to_cpu(ref->TimeToLive); 819 820 ref++; 821 } 822 823 parse_DFS_referrals_exit: 824 if (rc) { 825 free_dfs_info_array(*target_nodes, *num_of_nodes); 826 *target_nodes = NULL; 827 *num_of_nodes = 0; 828 } 829 return rc; 830 } 831 832 void extract_unc_hostname(const char *unc, const char **h, size_t *len) 833 { 834 const char *end; 835 836 /* skip initial slashes */ 837 while (*unc && (*unc == '\\' || *unc == '/')) 838 unc++; 839 840 end = unc; 841 842 while (*end && !(*end == '\\' || *end == '/')) 843 end++; 844 845 *h = unc; 846 *len = end - unc; 847 } 848 849 /** 850 * copy_path_name - copy src path to dst, possibly truncating 851 * @dst: The destination buffer 852 * @src: The source name 853 * 854 * returns number of bytes written (including trailing nul) 855 */ 856 int copy_path_name(char *dst, const char *src) 857 { 858 int name_len; 859 860 /* 861 * PATH_MAX includes nul, so if strlen(src) >= PATH_MAX it 862 * will truncate and strlen(dst) will be PATH_MAX-1 863 */ 864 name_len = strscpy(dst, src, PATH_MAX); 865 if (WARN_ON_ONCE(name_len < 0)) 866 name_len = PATH_MAX-1; 867 868 /* we count the trailing nul */ 869 name_len++; 870 return name_len; 871 } 872 873 struct super_cb_data { 874 void *data; 875 struct super_block *sb; 876 }; 877 878 static void tcon_super_cb(struct super_block *sb, void *arg) 879 { 880 struct super_cb_data *sd = arg; 881 struct cifs_sb_info *cifs_sb; 882 struct cifs_tcon *t1 = sd->data, *t2; 883 884 if (sd->sb) 885 return; 886 887 cifs_sb = CIFS_SB(sb); 888 t2 = cifs_sb_master_tcon(cifs_sb); 889 890 spin_lock(&t2->tc_lock); 891 if ((t1->ses == t2->ses || 892 t1->ses->dfs_root_ses == t2->ses->dfs_root_ses) && 893 t1->ses->server == t2->ses->server && 894 t2->origin_fullpath && 895 dfs_src_pathname_equal(t2->origin_fullpath, t1->origin_fullpath)) { 896 /* 897 * Take the active reference while iterate_supers_type() still 898 * holds s_umount shared. 899 */ 900 cifs_sb_active(sb); 901 sd->sb = sb; 902 } 903 spin_unlock(&t2->tc_lock); 904 } 905 906 static struct super_block *__cifs_get_super(void (*f)(struct super_block *, void *), 907 void *data) 908 { 909 struct super_cb_data sd = { 910 .data = data, 911 .sb = NULL, 912 }; 913 struct file_system_type **fs_type = (struct file_system_type *[]) { 914 &cifs_fs_type, &smb3_fs_type, NULL, 915 }; 916 917 for (; *fs_type; fs_type++) { 918 iterate_supers_type(*fs_type, f, &sd); 919 if (sd.sb) 920 return sd.sb; 921 } 922 pr_warn_once("%s: could not find dfs superblock\n", __func__); 923 return ERR_PTR(-EINVAL); 924 } 925 926 static void __cifs_put_super(struct super_block *sb) 927 { 928 if (!IS_ERR_OR_NULL(sb)) 929 cifs_sb_deactive(sb); 930 } 931 932 struct super_block *cifs_get_dfs_tcon_super(struct cifs_tcon *tcon) 933 { 934 spin_lock(&tcon->tc_lock); 935 if (!tcon->origin_fullpath) { 936 spin_unlock(&tcon->tc_lock); 937 return ERR_PTR(-ENOENT); 938 } 939 spin_unlock(&tcon->tc_lock); 940 return __cifs_get_super(tcon_super_cb, tcon); 941 } 942 943 void cifs_put_tcp_super(struct super_block *sb) 944 { 945 __cifs_put_super(sb); 946 } 947 948 #ifdef CONFIG_CIFS_DFS_UPCALL 949 int match_target_ip(struct TCP_Server_Info *server, 950 const char *host, size_t hostlen, 951 bool *result) 952 { 953 struct sockaddr_storage ss; 954 int rc; 955 956 cifs_dbg(FYI, "%s: hostname=%.*s\n", __func__, (int)hostlen, host); 957 958 *result = false; 959 960 rc = dns_resolve_name(server->dns_dom, host, hostlen, 961 (struct sockaddr *)&ss); 962 if (rc < 0) 963 return rc; 964 965 spin_lock(&server->srv_lock); 966 *result = cifs_match_ipaddr((struct sockaddr *)&server->dstaddr, (struct sockaddr *)&ss); 967 spin_unlock(&server->srv_lock); 968 cifs_dbg(FYI, "%s: ip addresses matched: %s\n", __func__, str_yes_no(*result)); 969 return 0; 970 } 971 972 int cifs_update_super_prepath(struct cifs_sb_info *cifs_sb, char *prefix) 973 { 974 int rc; 975 976 kfree(cifs_sb->prepath); 977 cifs_sb->prepath = NULL; 978 979 if (prefix && *prefix) { 980 cifs_sb->prepath = cifs_sanitize_prepath(prefix, GFP_ATOMIC); 981 if (IS_ERR(cifs_sb->prepath)) { 982 rc = PTR_ERR(cifs_sb->prepath); 983 cifs_sb->prepath = NULL; 984 return rc; 985 } 986 if (cifs_sb->prepath) 987 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb)); 988 } 989 990 atomic_or(CIFS_MOUNT_USE_PREFIX_PATH, &cifs_sb->mnt_cifs_flags); 991 return 0; 992 } 993 994 /* 995 * Handle weird Windows SMB server behaviour. It responds with 996 * STATUS_OBJECT_NAME_INVALID code to SMB2 QUERY_INFO request for 997 * "\<server>\<dfsname>\<linkpath>" DFS reference, where <dfsname> contains 998 * non-ASCII unicode symbols. 999 */ 1000 int cifs_inval_name_dfs_link_error(const unsigned int xid, 1001 struct cifs_tcon *tcon, 1002 struct cifs_sb_info *cifs_sb, 1003 const char *full_path, 1004 bool *islink) 1005 { 1006 struct TCP_Server_Info *server = tcon->ses->server; 1007 struct cifs_ses *ses = tcon->ses; 1008 size_t len; 1009 char *path; 1010 char *ref_path; 1011 1012 *islink = false; 1013 1014 /* 1015 * Fast path - skip check when @full_path doesn't have a prefix path to 1016 * look up or tcon is not DFS. 1017 */ 1018 if (strlen(full_path) < 2 || !cifs_sb || 1019 (cifs_sb_flags(cifs_sb) & CIFS_MOUNT_NO_DFS) || 1020 !is_tcon_dfs(tcon)) 1021 return 0; 1022 1023 spin_lock(&server->srv_lock); 1024 if (!server->leaf_fullpath) { 1025 spin_unlock(&server->srv_lock); 1026 return 0; 1027 } 1028 spin_unlock(&server->srv_lock); 1029 1030 /* 1031 * Slow path - tcon is DFS and @full_path has prefix path, so attempt 1032 * to get a referral to figure out whether it is an DFS link. 1033 */ 1034 len = strnlen(tcon->tree_name, MAX_TREE_SIZE + 1) + strlen(full_path) + 1; 1035 path = kmalloc(len, GFP_KERNEL); 1036 if (!path) 1037 return -ENOMEM; 1038 1039 scnprintf(path, len, "%s%s", tcon->tree_name, full_path); 1040 ref_path = dfs_cache_canonical_path(path + 1, cifs_sb->local_nls, 1041 cifs_remap(cifs_sb)); 1042 kfree(path); 1043 1044 if (IS_ERR(ref_path)) { 1045 if (PTR_ERR(ref_path) != -EINVAL) 1046 return PTR_ERR(ref_path); 1047 } else { 1048 struct dfs_info3_param *refs = NULL; 1049 int num_refs = 0; 1050 1051 /* 1052 * XXX: we are not using dfs_cache_find() here because we might 1053 * end up filling all the DFS cache and thus potentially 1054 * removing cached DFS targets that the client would eventually 1055 * need during failover. 1056 */ 1057 ses = CIFS_DFS_ROOT_SES(ses); 1058 if (ses->server->ops->get_dfs_refer && 1059 !ses->server->ops->get_dfs_refer(xid, ses, ref_path, &refs, 1060 &num_refs, cifs_sb->local_nls, 1061 cifs_remap(cifs_sb))) 1062 *islink = refs[0].server_type == DFS_TYPE_LINK; 1063 free_dfs_info_array(refs, num_refs); 1064 kfree(ref_path); 1065 } 1066 return 0; 1067 } 1068 #endif 1069 1070 int cifs_wait_for_server_reconnect(struct TCP_Server_Info *server, bool retry) 1071 { 1072 int timeout = 10; 1073 int rc; 1074 1075 spin_lock(&server->srv_lock); 1076 if (server->tcpStatus != CifsNeedReconnect) { 1077 spin_unlock(&server->srv_lock); 1078 return 0; 1079 } 1080 timeout *= server->nr_targets; 1081 spin_unlock(&server->srv_lock); 1082 1083 /* 1084 * Give demultiplex thread up to 10 seconds to each target available for 1085 * reconnect -- should be greater than cifs socket timeout which is 7 1086 * seconds. 1087 * 1088 * On "soft" mounts we wait once. Hard mounts keep retrying until 1089 * process is killed or server comes back on-line. 1090 */ 1091 do { 1092 rc = wait_event_interruptible_timeout(server->response_q, 1093 (server->tcpStatus != CifsNeedReconnect), 1094 timeout * HZ); 1095 if (rc < 0) { 1096 cifs_dbg(FYI, "%s: aborting reconnect due to received signal\n", 1097 __func__); 1098 return -ERESTARTSYS; 1099 } 1100 1101 /* are we still trying to reconnect? */ 1102 spin_lock(&server->srv_lock); 1103 if (server->tcpStatus != CifsNeedReconnect) { 1104 spin_unlock(&server->srv_lock); 1105 return 0; 1106 } 1107 spin_unlock(&server->srv_lock); 1108 } while (retry); 1109 1110 cifs_dbg(FYI, "%s: gave up waiting on reconnect\n", __func__); 1111 return -EHOSTDOWN; 1112 } 1113