1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * SMB1 (CIFS) version specific operations 4 * 5 * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com> 6 */ 7 8 #include <linux/pagemap.h> 9 #include <linux/vfs.h> 10 #include <linux/fs_struct.h> 11 #include <uapi/linux/magic.h> 12 #include "cifsglob.h" 13 #include "cifsproto.h" 14 #include "cifs_debug.h" 15 #include "cifs_unicode.h" 16 #include "fs_context.h" 17 #include "nterr.h" 18 #include "smberr.h" 19 #include "reparse.h" 20 21 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon, 22 struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) 23 { 24 /* 25 * If we are reconnecting then should we check to see if 26 * any requested capabilities changed locally e.g. via 27 * remount but we can not do much about it here 28 * if they have (even if we could detect it by the following) 29 * Perhaps we could add a backpointer to array of sb from tcon 30 * or if we change to make all sb to same share the same 31 * sb as NFS - then we only have one backpointer to sb. 32 * What if we wanted to mount the server share twice once with 33 * and once without posixacls or posix paths? 34 */ 35 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); 36 37 if (ctx && ctx->no_linux_ext) { 38 tcon->fsUnixInfo.Capability = 0; 39 tcon->unix_ext = 0; /* Unix Extensions disabled */ 40 cifs_dbg(FYI, "Linux protocol extensions disabled\n"); 41 return; 42 } else if (ctx) 43 tcon->unix_ext = 1; /* Unix Extensions supported */ 44 45 if (!tcon->unix_ext) { 46 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n"); 47 return; 48 } 49 50 if (!CIFSSMBQFSUnixInfo(xid, tcon)) { 51 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability); 52 53 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap); 54 /* 55 * check for reconnect case in which we do not 56 * want to change the mount behavior if we can avoid it 57 */ 58 if (ctx == NULL) { 59 /* 60 * turn off POSIX ACL and PATHNAMES if not set 61 * originally at mount time 62 */ 63 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0) 64 cap &= ~CIFS_UNIX_POSIX_ACL_CAP; 65 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) { 66 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) 67 cifs_dbg(VFS, "POSIXPATH support change\n"); 68 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP; 69 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) { 70 cifs_dbg(VFS, "possible reconnect error\n"); 71 cifs_dbg(VFS, "server disabled POSIX path support\n"); 72 } 73 } 74 75 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP) 76 cifs_dbg(VFS, "per-share encryption not supported yet\n"); 77 78 cap &= CIFS_UNIX_CAP_MASK; 79 if (ctx && ctx->no_psx_acl) 80 cap &= ~CIFS_UNIX_POSIX_ACL_CAP; 81 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) { 82 cifs_dbg(FYI, "negotiated posix acl support\n"); 83 if (cifs_sb) 84 cifs_sb->mnt_cifs_flags |= 85 CIFS_MOUNT_POSIXACL; 86 } 87 88 if (ctx && ctx->posix_paths == 0) 89 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP; 90 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) { 91 cifs_dbg(FYI, "negotiate posix pathnames\n"); 92 if (cifs_sb) 93 cifs_sb->mnt_cifs_flags |= 94 CIFS_MOUNT_POSIX_PATHS; 95 } 96 97 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap); 98 #ifdef CONFIG_CIFS_DEBUG2 99 if (cap & CIFS_UNIX_FCNTL_CAP) 100 cifs_dbg(FYI, "FCNTL cap\n"); 101 if (cap & CIFS_UNIX_EXTATTR_CAP) 102 cifs_dbg(FYI, "EXTATTR cap\n"); 103 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) 104 cifs_dbg(FYI, "POSIX path cap\n"); 105 if (cap & CIFS_UNIX_XATTR_CAP) 106 cifs_dbg(FYI, "XATTR cap\n"); 107 if (cap & CIFS_UNIX_POSIX_ACL_CAP) 108 cifs_dbg(FYI, "POSIX ACL cap\n"); 109 if (cap & CIFS_UNIX_LARGE_READ_CAP) 110 cifs_dbg(FYI, "very large read cap\n"); 111 if (cap & CIFS_UNIX_LARGE_WRITE_CAP) 112 cifs_dbg(FYI, "very large write cap\n"); 113 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP) 114 cifs_dbg(FYI, "transport encryption cap\n"); 115 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP) 116 cifs_dbg(FYI, "mandatory transport encryption cap\n"); 117 #endif /* CIFS_DEBUG2 */ 118 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) { 119 if (ctx == NULL) 120 cifs_dbg(FYI, "resetting capabilities failed\n"); 121 else 122 cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n"); 123 124 } 125 } 126 } 127 128 /* 129 * An NT cancel request header looks just like the original request except: 130 * 131 * The Command is SMB_COM_NT_CANCEL 132 * The WordCount is zeroed out 133 * The ByteCount is zeroed out 134 * 135 * This function mangles an existing request buffer into a 136 * SMB_COM_NT_CANCEL request and then sends it. 137 */ 138 static int 139 send_nt_cancel(struct cifs_ses *ses, struct TCP_Server_Info *server, 140 struct smb_rqst *rqst, struct mid_q_entry *mid, 141 unsigned int xid) 142 { 143 struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base; 144 struct kvec iov[1]; 145 struct smb_rqst crqst = { .rq_iov = iov, .rq_nvec = 1 }; 146 int rc = 0; 147 148 /* +2 for BCC field */ 149 in_buf->Command = SMB_COM_NT_CANCEL; 150 in_buf->WordCount = 0; 151 put_bcc(0, in_buf); 152 153 iov[0].iov_base = in_buf; 154 iov[0].iov_len = sizeof(struct smb_hdr) + 2; 155 156 cifs_server_lock(server); 157 rc = cifs_sign_rqst(&crqst, server, &mid->sequence_number); 158 if (rc) { 159 cifs_server_unlock(server); 160 return rc; 161 } 162 163 /* 164 * The response to this call was already factored into the sequence 165 * number when the call went out, so we must adjust it back downward 166 * after signing here. 167 */ 168 --server->sequence_number; 169 rc = __smb_send_rqst(server, 1, &crqst); 170 if (rc < 0) 171 server->sequence_number--; 172 173 cifs_server_unlock(server); 174 175 cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n", 176 get_mid(in_buf), rc); 177 178 return rc; 179 } 180 181 /* 182 * Send a LOCKINGX_CANCEL_LOCK to cause the Windows blocking lock to 183 * return. 184 */ 185 static int 186 send_lock_cancel(struct cifs_ses *ses, struct TCP_Server_Info *server, 187 struct smb_rqst *rqst, struct mid_q_entry *mid, 188 unsigned int xid) 189 { 190 struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base; 191 unsigned int in_len = rqst->rq_iov[0].iov_len; 192 LOCK_REQ *pSMB = (LOCK_REQ *)in_buf; 193 int rc; 194 195 /* We just modify the current in_buf to change 196 * the type of lock from LOCKING_ANDX_SHARED_LOCK 197 * or LOCKING_ANDX_EXCLUSIVE_LOCK to 198 * LOCKING_ANDX_CANCEL_LOCK. 199 */ 200 pSMB->LockType = LOCKING_ANDX_CANCEL_LOCK|LOCKING_ANDX_LARGE_FILES; 201 pSMB->Timeout = 0; 202 pSMB->hdr.Mid = get_next_mid(ses->server); 203 204 rc = SendReceive(xid, ses, in_buf, in_len, NULL, NULL, 0); 205 if (rc == -ENOLCK) 206 rc = 0; /* If we get back -ENOLCK, it probably means we managed 207 * to cancel the lock command before it took effect. 208 */ 209 return rc; 210 } 211 212 static int cifs_send_cancel(struct cifs_ses *ses, struct TCP_Server_Info *server, 213 struct smb_rqst *rqst, struct mid_q_entry *mid, 214 unsigned int xid) 215 { 216 if (mid->sr_flags & CIFS_WINDOWS_LOCK) 217 return send_lock_cancel(ses, server, rqst, mid, xid); 218 return send_nt_cancel(ses, server, rqst, mid, xid); 219 } 220 221 static bool 222 cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2) 223 { 224 return ob1->fid.netfid == ob2->fid.netfid; 225 } 226 227 static unsigned int 228 cifs_read_data_offset(char *buf) 229 { 230 READ_RSP *rsp = (READ_RSP *)buf; 231 return le16_to_cpu(rsp->DataOffset); 232 } 233 234 static unsigned int 235 cifs_read_data_length(char *buf, bool in_remaining) 236 { 237 READ_RSP *rsp = (READ_RSP *)buf; 238 /* It's a bug reading remaining data for SMB1 packets */ 239 WARN_ON(in_remaining); 240 return (le16_to_cpu(rsp->DataLengthHigh) << 16) + 241 le16_to_cpu(rsp->DataLength); 242 } 243 244 static struct mid_q_entry * 245 cifs_find_mid(struct TCP_Server_Info *server, char *buffer) 246 { 247 struct smb_hdr *buf = (struct smb_hdr *)buffer; 248 struct mid_q_entry *mid; 249 250 spin_lock(&server->mid_queue_lock); 251 list_for_each_entry(mid, &server->pending_mid_q, qhead) { 252 if (compare_mid(mid->mid, buf) && 253 mid->mid_state == MID_REQUEST_SUBMITTED && 254 le16_to_cpu(mid->command) == buf->Command) { 255 smb_get_mid(mid); 256 spin_unlock(&server->mid_queue_lock); 257 return mid; 258 } 259 } 260 spin_unlock(&server->mid_queue_lock); 261 return NULL; 262 } 263 264 static void 265 cifs_add_credits(struct TCP_Server_Info *server, 266 struct cifs_credits *credits, const int optype) 267 { 268 spin_lock(&server->req_lock); 269 server->credits += credits->value; 270 server->in_flight--; 271 spin_unlock(&server->req_lock); 272 wake_up(&server->request_q); 273 } 274 275 static void 276 cifs_set_credits(struct TCP_Server_Info *server, const int val) 277 { 278 spin_lock(&server->req_lock); 279 server->credits = val; 280 server->oplocks = val > 1 ? enable_oplocks : false; 281 spin_unlock(&server->req_lock); 282 } 283 284 static int * 285 cifs_get_credits_field(struct TCP_Server_Info *server, const int optype) 286 { 287 return &server->credits; 288 } 289 290 static unsigned int 291 cifs_get_credits(struct mid_q_entry *mid) 292 { 293 return 1; 294 } 295 296 /* 297 * Find a free multiplex id (SMB mid). Otherwise there could be 298 * mid collisions which might cause problems, demultiplexing the 299 * wrong response to this request. Multiplex ids could collide if 300 * one of a series requests takes much longer than the others, or 301 * if a very large number of long lived requests (byte range 302 * locks or FindNotify requests) are pending. No more than 303 * 64K-1 requests can be outstanding at one time. If no 304 * mids are available, return zero. A future optimization 305 * could make the combination of mids and uid the key we use 306 * to demultiplex on (rather than mid alone). 307 * In addition to the above check, the cifs demultiplex 308 * code already used the command code as a secondary 309 * check of the frame and if signing is negotiated the 310 * response would be discarded if the mid were the same 311 * but the signature was wrong. Since the mid is not put in the 312 * pending queue until later (when it is about to be dispatched) 313 * we do have to limit the number of outstanding requests 314 * to somewhat less than 64K-1 although it is hard to imagine 315 * so many threads being in the vfs at one time. 316 */ 317 static __u64 318 cifs_get_next_mid(struct TCP_Server_Info *server) 319 { 320 __u64 mid = 0; 321 __u16 last_mid, cur_mid; 322 bool collision, reconnect = false; 323 324 spin_lock(&server->mid_counter_lock); 325 /* mid is 16 bit only for CIFS/SMB */ 326 cur_mid = (__u16)((server->current_mid) & 0xffff); 327 /* we do not want to loop forever */ 328 last_mid = cur_mid; 329 cur_mid++; 330 /* avoid 0xFFFF MID */ 331 if (cur_mid == 0xffff) 332 cur_mid++; 333 334 /* 335 * This nested loop looks more expensive than it is. 336 * In practice the list of pending requests is short, 337 * fewer than 50, and the mids are likely to be unique 338 * on the first pass through the loop unless some request 339 * takes longer than the 64 thousand requests before it 340 * (and it would also have to have been a request that 341 * did not time out). 342 */ 343 while (cur_mid != last_mid) { 344 struct mid_q_entry *mid_entry; 345 unsigned int num_mids; 346 347 collision = false; 348 if (cur_mid == 0) 349 cur_mid++; 350 351 num_mids = 0; 352 spin_lock(&server->mid_queue_lock); 353 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) { 354 ++num_mids; 355 if (mid_entry->mid == cur_mid && 356 mid_entry->mid_state == MID_REQUEST_SUBMITTED) { 357 /* This mid is in use, try a different one */ 358 collision = true; 359 break; 360 } 361 } 362 spin_unlock(&server->mid_queue_lock); 363 364 /* 365 * if we have more than 32k mids in the list, then something 366 * is very wrong. Possibly a local user is trying to DoS the 367 * box by issuing long-running calls and SIGKILL'ing them. If 368 * we get to 2^16 mids then we're in big trouble as this 369 * function could loop forever. 370 * 371 * Go ahead and assign out the mid in this situation, but force 372 * an eventual reconnect to clean out the pending_mid_q. 373 */ 374 if (num_mids > 32768) 375 reconnect = true; 376 377 if (!collision) { 378 mid = (__u64)cur_mid; 379 server->current_mid = mid; 380 break; 381 } 382 cur_mid++; 383 } 384 spin_unlock(&server->mid_counter_lock); 385 386 if (reconnect) { 387 cifs_signal_cifsd_for_reconnect(server, false); 388 } 389 390 return mid; 391 } 392 393 static void 394 cifs_downgrade_oplock(struct TCP_Server_Info *server, 395 struct cifsInodeInfo *cinode, __u32 oplock, 396 __u16 epoch, bool *purge_cache) 397 { 398 cifs_set_oplock_level(cinode, oplock); 399 } 400 401 static bool 402 cifs_need_neg(struct TCP_Server_Info *server) 403 { 404 return server->maxBuf == 0; 405 } 406 407 static int 408 cifs_negotiate(const unsigned int xid, 409 struct cifs_ses *ses, 410 struct TCP_Server_Info *server) 411 { 412 int rc; 413 rc = CIFSSMBNegotiate(xid, ses, server); 414 return rc; 415 } 416 417 static unsigned int 418 smb1_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) 419 { 420 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); 421 struct TCP_Server_Info *server = tcon->ses->server; 422 unsigned int wsize; 423 424 /* start with specified wsize, or default */ 425 if (ctx->got_wsize) 426 wsize = ctx->vol_wsize; 427 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) 428 wsize = CIFS_DEFAULT_IOSIZE; 429 else 430 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE; 431 432 /* can server support 24-bit write sizes? (via UNIX extensions) */ 433 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) 434 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE); 435 436 /* 437 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set? 438 * Limit it to max buffer offered by the server, minus the size of the 439 * WRITEX header, not including the 4 byte RFC1001 length. 440 */ 441 if (!(server->capabilities & CAP_LARGE_WRITE_X) || 442 (!(server->capabilities & CAP_UNIX) && server->sign)) 443 wsize = min_t(unsigned int, wsize, 444 server->maxBuf - sizeof(WRITE_REQ)); 445 446 /* hard limit of CIFS_MAX_WSIZE */ 447 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE); 448 449 return wsize; 450 } 451 452 static unsigned int 453 smb1_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) 454 { 455 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); 456 struct TCP_Server_Info *server = tcon->ses->server; 457 unsigned int rsize, defsize; 458 459 /* 460 * Set default value... 461 * 462 * HACK alert! Ancient servers have very small buffers. Even though 463 * MS-CIFS indicates that servers are only limited by the client's 464 * bufsize for reads, testing against win98se shows that it throws 465 * INVALID_PARAMETER errors if you try to request too large a read. 466 * OS/2 just sends back short reads. 467 * 468 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that 469 * it can't handle a read request larger than its MaxBufferSize either. 470 */ 471 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP)) 472 defsize = CIFS_DEFAULT_IOSIZE; 473 else if (server->capabilities & CAP_LARGE_READ_X) 474 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE; 475 else 476 defsize = server->maxBuf - sizeof(READ_RSP); 477 478 rsize = ctx->got_rsize ? ctx->vol_rsize : defsize; 479 480 /* 481 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to 482 * the client's MaxBufferSize. 483 */ 484 if (!(server->capabilities & CAP_LARGE_READ_X)) 485 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize); 486 487 /* hard limit of CIFS_MAX_RSIZE */ 488 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE); 489 490 return rsize; 491 } 492 493 static void 494 cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon, 495 struct cifs_sb_info *cifs_sb) 496 { 497 CIFSSMBQFSDeviceInfo(xid, tcon); 498 CIFSSMBQFSAttributeInfo(xid, tcon); 499 } 500 501 static int 502 cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon, 503 struct cifs_sb_info *cifs_sb, const char *full_path) 504 { 505 int rc; 506 FILE_ALL_INFO *file_info; 507 508 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); 509 if (file_info == NULL) 510 return -ENOMEM; 511 512 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info, 513 0 /* not legacy */, cifs_sb->local_nls, 514 cifs_remap(cifs_sb)); 515 516 if (rc == -EOPNOTSUPP || rc == -EINVAL) 517 rc = SMBQueryInformation(xid, tcon, full_path, file_info, 518 cifs_sb->local_nls, cifs_remap(cifs_sb)); 519 kfree(file_info); 520 return rc; 521 } 522 523 static int cifs_query_path_info(const unsigned int xid, 524 struct cifs_tcon *tcon, 525 struct cifs_sb_info *cifs_sb, 526 const char *full_path, 527 struct cifs_open_info_data *data) 528 { 529 int rc = -EOPNOTSUPP; 530 FILE_ALL_INFO fi = {}; 531 struct cifs_search_info search_info = {}; 532 bool non_unicode_wildcard = false; 533 534 data->reparse_point = false; 535 data->adjust_tz = false; 536 537 /* 538 * First try CIFSSMBQPathInfo() function which returns more info 539 * (NumberOfLinks) than CIFSFindFirst() fallback function. 540 * Some servers like Win9x do not support SMB_QUERY_FILE_ALL_INFO over 541 * TRANS2_QUERY_PATH_INFORMATION, but supports it with filehandle over 542 * TRANS2_QUERY_FILE_INFORMATION (function CIFSSMBQFileInfo(). But SMB 543 * Open command on non-NT servers works only for files, does not work 544 * for directories. And moreover Win9x SMB server returns bogus data in 545 * SMB_QUERY_FILE_ALL_INFO Attributes field. So for non-NT servers, 546 * do not even use CIFSSMBQPathInfo() or CIFSSMBQFileInfo() function. 547 */ 548 if (tcon->ses->capabilities & CAP_NT_SMBS) 549 rc = CIFSSMBQPathInfo(xid, tcon, full_path, &fi, 0 /* not legacy */, 550 cifs_sb->local_nls, cifs_remap(cifs_sb)); 551 552 /* 553 * Non-UNICODE variant of fallback functions below expands wildcards, 554 * so they cannot be used for querying paths with wildcard characters. 555 */ 556 if (rc && !(tcon->ses->capabilities & CAP_UNICODE) && strpbrk(full_path, "*?\"><")) 557 non_unicode_wildcard = true; 558 559 /* 560 * Then fallback to CIFSFindFirst() which works also with non-NT servers 561 * but does not does not provide NumberOfLinks. 562 */ 563 if ((rc == -EOPNOTSUPP || rc == -EINVAL) && 564 !non_unicode_wildcard) { 565 if (!(tcon->ses->capabilities & tcon->ses->server->vals->cap_nt_find)) 566 search_info.info_level = SMB_FIND_FILE_INFO_STANDARD; 567 else 568 search_info.info_level = SMB_FIND_FILE_FULL_DIRECTORY_INFO; 569 rc = CIFSFindFirst(xid, tcon, full_path, cifs_sb, NULL, 570 CIFS_SEARCH_CLOSE_ALWAYS | CIFS_SEARCH_CLOSE_AT_END, 571 &search_info, false); 572 if (rc == 0) { 573 if (!(tcon->ses->capabilities & tcon->ses->server->vals->cap_nt_find)) { 574 FIND_FILE_STANDARD_INFO *di; 575 int offset = tcon->ses->server->timeAdj; 576 577 di = (FIND_FILE_STANDARD_INFO *)search_info.srch_entries_start; 578 fi.CreationTime = cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm( 579 di->CreationDate, di->CreationTime, offset))); 580 fi.LastAccessTime = cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm( 581 di->LastAccessDate, di->LastAccessTime, offset))); 582 fi.LastWriteTime = cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm( 583 di->LastWriteDate, di->LastWriteTime, offset))); 584 fi.ChangeTime = fi.LastWriteTime; 585 fi.Attributes = cpu_to_le32(le16_to_cpu(di->Attributes)); 586 fi.AllocationSize = cpu_to_le64(le32_to_cpu(di->AllocationSize)); 587 fi.EndOfFile = cpu_to_le64(le32_to_cpu(di->DataSize)); 588 } else { 589 FILE_FULL_DIRECTORY_INFO *di; 590 591 di = (FILE_FULL_DIRECTORY_INFO *)search_info.srch_entries_start; 592 fi.CreationTime = di->CreationTime; 593 fi.LastAccessTime = di->LastAccessTime; 594 fi.LastWriteTime = di->LastWriteTime; 595 fi.ChangeTime = di->ChangeTime; 596 fi.Attributes = di->ExtFileAttributes; 597 fi.AllocationSize = di->AllocationSize; 598 fi.EndOfFile = di->EndOfFile; 599 fi.EASize = di->EaSize; 600 } 601 fi.NumberOfLinks = cpu_to_le32(1); 602 fi.DeletePending = 0; 603 fi.Directory = !!(le32_to_cpu(fi.Attributes) & ATTR_DIRECTORY); 604 cifs_buf_release(search_info.ntwrk_buf_start); 605 } else if (!full_path[0]) { 606 /* 607 * CIFSFindFirst() does not work on root path if the 608 * root path was exported on the server from the top 609 * level path (drive letter). 610 */ 611 rc = -EOPNOTSUPP; 612 } 613 } 614 615 /* 616 * If everything failed then fallback to the legacy SMB command 617 * SMB_COM_QUERY_INFORMATION which works with all servers, but 618 * provide just few information. 619 */ 620 if ((rc == -EOPNOTSUPP || rc == -EINVAL) && !non_unicode_wildcard) { 621 rc = SMBQueryInformation(xid, tcon, full_path, &fi, cifs_sb->local_nls, 622 cifs_remap(cifs_sb)); 623 data->adjust_tz = true; 624 } else if ((rc == -EOPNOTSUPP || rc == -EINVAL) && non_unicode_wildcard) { 625 /* Path with non-UNICODE wildcard character cannot exist. */ 626 rc = -ENOENT; 627 } 628 629 if (!rc) { 630 move_cifs_info_to_smb2(&data->fi, &fi); 631 data->reparse_point = le32_to_cpu(fi.Attributes) & ATTR_REPARSE_POINT; 632 } 633 634 #ifdef CONFIG_CIFS_XATTR 635 /* 636 * For non-symlink WSL reparse points it is required to fetch 637 * EA $LXMOD which contains in its S_DT part the mandatory file type. 638 */ 639 if (!rc && data->reparse_point) { 640 struct smb2_file_full_ea_info *ea; 641 u32 next = 0; 642 643 ea = (struct smb2_file_full_ea_info *)data->wsl.eas; 644 do { 645 ea = (void *)((u8 *)ea + next); 646 next = le32_to_cpu(ea->next_entry_offset); 647 } while (next); 648 if (le16_to_cpu(ea->ea_value_length)) { 649 ea->next_entry_offset = cpu_to_le32(ALIGN(sizeof(*ea) + 650 ea->ea_name_length + 1 + 651 le16_to_cpu(ea->ea_value_length), 4)); 652 ea = (void *)((u8 *)ea + le32_to_cpu(ea->next_entry_offset)); 653 } 654 655 rc = CIFSSMBQAllEAs(xid, tcon, full_path, SMB2_WSL_XATTR_MODE, 656 &ea->ea_data[SMB2_WSL_XATTR_NAME_LEN + 1], 657 SMB2_WSL_XATTR_MODE_SIZE, cifs_sb); 658 if (rc == SMB2_WSL_XATTR_MODE_SIZE) { 659 ea->next_entry_offset = cpu_to_le32(0); 660 ea->flags = 0; 661 ea->ea_name_length = SMB2_WSL_XATTR_NAME_LEN; 662 ea->ea_value_length = cpu_to_le16(SMB2_WSL_XATTR_MODE_SIZE); 663 memcpy(&ea->ea_data[0], SMB2_WSL_XATTR_MODE, SMB2_WSL_XATTR_NAME_LEN + 1); 664 data->wsl.eas_len += ALIGN(sizeof(*ea) + SMB2_WSL_XATTR_NAME_LEN + 1 + 665 SMB2_WSL_XATTR_MODE_SIZE, 4); 666 rc = 0; 667 } else if (rc >= 0) { 668 /* It is an error if EA $LXMOD has wrong size. */ 669 rc = -EINVAL; 670 } else { 671 /* 672 * In all other cases ignore error if fetching 673 * of EA $LXMOD failed. It is needed only for 674 * non-symlink WSL reparse points and wsl_to_fattr() 675 * handle the case when EA is missing. 676 */ 677 rc = 0; 678 } 679 } 680 681 /* 682 * For WSL CHR and BLK reparse points it is required to fetch 683 * EA $LXDEV which contains major and minor device numbers. 684 */ 685 if (!rc && data->reparse_point) { 686 struct smb2_file_full_ea_info *ea; 687 u32 next = 0; 688 689 ea = (struct smb2_file_full_ea_info *)data->wsl.eas; 690 do { 691 ea = (void *)((u8 *)ea + next); 692 next = le32_to_cpu(ea->next_entry_offset); 693 } while (next); 694 if (le16_to_cpu(ea->ea_value_length)) { 695 ea->next_entry_offset = cpu_to_le32(ALIGN(sizeof(*ea) + 696 ea->ea_name_length + 1 + 697 le16_to_cpu(ea->ea_value_length), 4)); 698 ea = (void *)((u8 *)ea + le32_to_cpu(ea->next_entry_offset)); 699 } 700 701 rc = CIFSSMBQAllEAs(xid, tcon, full_path, SMB2_WSL_XATTR_DEV, 702 &ea->ea_data[SMB2_WSL_XATTR_NAME_LEN + 1], 703 SMB2_WSL_XATTR_DEV_SIZE, cifs_sb); 704 if (rc == SMB2_WSL_XATTR_DEV_SIZE) { 705 ea->next_entry_offset = cpu_to_le32(0); 706 ea->flags = 0; 707 ea->ea_name_length = SMB2_WSL_XATTR_NAME_LEN; 708 ea->ea_value_length = cpu_to_le16(SMB2_WSL_XATTR_DEV_SIZE); 709 memcpy(&ea->ea_data[0], SMB2_WSL_XATTR_DEV, SMB2_WSL_XATTR_NAME_LEN + 1); 710 data->wsl.eas_len += ALIGN(sizeof(*ea) + SMB2_WSL_XATTR_NAME_LEN + 1 + 711 SMB2_WSL_XATTR_MODE_SIZE, 4); 712 rc = 0; 713 } else if (rc >= 0) { 714 /* It is an error if EA $LXDEV has wrong size. */ 715 rc = -EINVAL; 716 } else { 717 /* 718 * In all other cases ignore error if fetching 719 * of EA $LXDEV failed. It is needed only for 720 * WSL CHR and BLK reparse points and wsl_to_fattr() 721 * handle the case when EA is missing. 722 */ 723 rc = 0; 724 } 725 } 726 #endif 727 728 return rc; 729 } 730 731 static int cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon, 732 struct cifs_sb_info *cifs_sb, const char *full_path, 733 u64 *uniqueid, struct cifs_open_info_data *unused) 734 { 735 /* 736 * We can not use the IndexNumber field by default from Windows or 737 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA 738 * CIFS spec claims that this value is unique within the scope of a 739 * share, and the windows docs hint that it's actually unique 740 * per-machine. 741 * 742 * There may be higher info levels that work but are there Windows 743 * server or network appliances for which IndexNumber field is not 744 * guaranteed unique? 745 * 746 * CIFSGetSrvInodeNumber() uses SMB_QUERY_FILE_INTERNAL_INFO 747 * which is SMB PASSTHROUGH level therefore check for capability. 748 * Note that this function can be called with tcon == NULL. 749 */ 750 if (tcon && !(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) 751 return -EOPNOTSUPP; 752 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid, 753 cifs_sb->local_nls, 754 cifs_remap(cifs_sb)); 755 } 756 757 static int cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon, 758 struct cifsFileInfo *cfile, struct cifs_open_info_data *data) 759 { 760 int rc; 761 FILE_ALL_INFO fi = {}; 762 763 /* 764 * CIFSSMBQFileInfo() for non-NT servers returns bogus data in 765 * Attributes fields. So do not use this command for non-NT servers. 766 */ 767 if (!(tcon->ses->capabilities & CAP_NT_SMBS)) 768 return -EOPNOTSUPP; 769 770 if (cfile->symlink_target) { 771 data->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL); 772 if (!data->symlink_target) 773 return -ENOMEM; 774 } 775 776 rc = CIFSSMBQFileInfo(xid, tcon, cfile->fid.netfid, &fi); 777 if (!rc) 778 move_cifs_info_to_smb2(&data->fi, &fi); 779 return rc; 780 } 781 782 static void 783 cifs_clear_stats(struct cifs_tcon *tcon) 784 { 785 atomic_set(&tcon->stats.cifs_stats.num_writes, 0); 786 atomic_set(&tcon->stats.cifs_stats.num_reads, 0); 787 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0); 788 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0); 789 atomic_set(&tcon->stats.cifs_stats.num_opens, 0); 790 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0); 791 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0); 792 atomic_set(&tcon->stats.cifs_stats.num_closes, 0); 793 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0); 794 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0); 795 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0); 796 atomic_set(&tcon->stats.cifs_stats.num_renames, 0); 797 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0); 798 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0); 799 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0); 800 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0); 801 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0); 802 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0); 803 atomic_set(&tcon->stats.cifs_stats.num_locks, 0); 804 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0); 805 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0); 806 } 807 808 static void 809 cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon) 810 { 811 seq_printf(m, " Oplocks breaks: %d", 812 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks)); 813 seq_printf(m, "\nReads: %d Bytes: %llu", 814 atomic_read(&tcon->stats.cifs_stats.num_reads), 815 (long long)(tcon->bytes_read)); 816 seq_printf(m, "\nWrites: %d Bytes: %llu", 817 atomic_read(&tcon->stats.cifs_stats.num_writes), 818 (long long)(tcon->bytes_written)); 819 seq_printf(m, "\nFlushes: %d", 820 atomic_read(&tcon->stats.cifs_stats.num_flushes)); 821 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d", 822 atomic_read(&tcon->stats.cifs_stats.num_locks), 823 atomic_read(&tcon->stats.cifs_stats.num_hardlinks), 824 atomic_read(&tcon->stats.cifs_stats.num_symlinks)); 825 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d", 826 atomic_read(&tcon->stats.cifs_stats.num_opens), 827 atomic_read(&tcon->stats.cifs_stats.num_closes), 828 atomic_read(&tcon->stats.cifs_stats.num_deletes)); 829 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d", 830 atomic_read(&tcon->stats.cifs_stats.num_posixopens), 831 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs)); 832 seq_printf(m, "\nMkdirs: %d Rmdirs: %d", 833 atomic_read(&tcon->stats.cifs_stats.num_mkdirs), 834 atomic_read(&tcon->stats.cifs_stats.num_rmdirs)); 835 seq_printf(m, "\nRenames: %d T2 Renames %d", 836 atomic_read(&tcon->stats.cifs_stats.num_renames), 837 atomic_read(&tcon->stats.cifs_stats.num_t2renames)); 838 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d", 839 atomic_read(&tcon->stats.cifs_stats.num_ffirst), 840 atomic_read(&tcon->stats.cifs_stats.num_fnext), 841 atomic_read(&tcon->stats.cifs_stats.num_fclose)); 842 } 843 844 static void 845 cifs_mkdir_setinfo(struct inode *inode, const char *full_path, 846 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon, 847 const unsigned int xid) 848 { 849 FILE_BASIC_INFO info; 850 struct cifsInodeInfo *cifsInode; 851 u32 dosattrs; 852 int rc; 853 854 memset(&info, 0, sizeof(info)); 855 cifsInode = CIFS_I(inode); 856 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY; 857 info.Attributes = cpu_to_le32(dosattrs); 858 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls, 859 cifs_sb); 860 if (rc == -EOPNOTSUPP || rc == -EINVAL) 861 rc = SMBSetInformation(xid, tcon, full_path, 862 info.Attributes, 863 0 /* do not change write time */, 864 cifs_sb->local_nls, cifs_sb); 865 if (rc == 0) 866 cifsInode->cifsAttrs = dosattrs; 867 } 868 869 static int cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 870 void *buf) 871 { 872 struct cifs_open_info_data *data = buf; 873 FILE_ALL_INFO fi = {}; 874 int rc; 875 876 if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS)) 877 rc = SMBLegacyOpen(xid, oparms->tcon, oparms->path, 878 oparms->disposition, 879 oparms->desired_access, 880 oparms->create_options, 881 &oparms->fid->netfid, oplock, &fi, 882 oparms->cifs_sb->local_nls, 883 cifs_remap(oparms->cifs_sb)); 884 else 885 rc = CIFS_open(xid, oparms, oplock, &fi); 886 887 if (!rc && data) 888 move_cifs_info_to_smb2(&data->fi, &fi); 889 890 return rc; 891 } 892 893 static void 894 cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock) 895 { 896 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); 897 cfile->fid.netfid = fid->netfid; 898 cifs_set_oplock_level(cinode, oplock); 899 cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode); 900 } 901 902 static int 903 cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon, 904 struct cifs_fid *fid) 905 { 906 return CIFSSMBClose(xid, tcon, fid->netfid); 907 } 908 909 static int 910 cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon, 911 struct cifs_fid *fid) 912 { 913 return CIFSSMBFlush(xid, tcon, fid->netfid); 914 } 915 916 static int 917 cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid, 918 struct cifs_io_parms *parms, unsigned int *bytes_read, 919 char **buf, int *buf_type) 920 { 921 parms->netfid = pfid->netfid; 922 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type); 923 } 924 925 static int 926 cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid, 927 struct cifs_io_parms *parms, unsigned int *written, 928 struct kvec *iov, unsigned long nr_segs) 929 { 930 931 parms->netfid = pfid->netfid; 932 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs); 933 } 934 935 static int 936 smb_set_file_info(struct inode *inode, const char *full_path, 937 FILE_BASIC_INFO *buf, const unsigned int xid) 938 { 939 int oplock = 0; 940 int rc; 941 __u32 netpid; 942 struct cifs_fid fid; 943 struct cifs_open_parms oparms; 944 struct cifsFileInfo *open_file; 945 FILE_BASIC_INFO new_buf; 946 struct cifs_open_info_data query_data; 947 __le64 write_time = buf->LastWriteTime; 948 struct cifsInodeInfo *cinode = CIFS_I(inode); 949 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 950 struct tcon_link *tlink = NULL; 951 struct cifs_tcon *tcon; 952 953 /* if the file is already open for write, just use that fileid */ 954 open_file = find_writable_file(cinode, FIND_WR_FSUID_ONLY); 955 956 if (open_file) { 957 fid.netfid = open_file->fid.netfid; 958 netpid = open_file->pid; 959 tcon = tlink_tcon(open_file->tlink); 960 } else { 961 tlink = cifs_sb_tlink(cifs_sb); 962 if (IS_ERR(tlink)) { 963 rc = PTR_ERR(tlink); 964 tlink = NULL; 965 goto out; 966 } 967 tcon = tlink_tcon(tlink); 968 } 969 970 /* 971 * Non-NT servers interprets zero time value in SMB_SET_FILE_BASIC_INFO 972 * over TRANS2_SET_FILE_INFORMATION as a valid time value. NT servers 973 * interprets zero time value as do not change existing value on server. 974 * API of ->set_file_info() callback expects that zero time value has 975 * the NT meaning - do not change. Therefore if server is non-NT and 976 * some time values in "buf" are zero, then fetch missing time values. 977 */ 978 if (!(tcon->ses->capabilities & CAP_NT_SMBS) && 979 (!buf->CreationTime || !buf->LastAccessTime || 980 !buf->LastWriteTime || !buf->ChangeTime)) { 981 rc = cifs_query_path_info(xid, tcon, cifs_sb, full_path, &query_data); 982 if (rc) { 983 if (open_file) { 984 cifsFileInfo_put(open_file); 985 open_file = NULL; 986 } 987 goto out; 988 } 989 /* 990 * Original write_time from buf->LastWriteTime is preserved 991 * as SMBSetInformation() interprets zero as do not change. 992 */ 993 new_buf = *buf; 994 buf = &new_buf; 995 if (!buf->CreationTime) 996 buf->CreationTime = query_data.fi.CreationTime; 997 if (!buf->LastAccessTime) 998 buf->LastAccessTime = query_data.fi.LastAccessTime; 999 if (!buf->LastWriteTime) 1000 buf->LastWriteTime = query_data.fi.LastWriteTime; 1001 if (!buf->ChangeTime) 1002 buf->ChangeTime = query_data.fi.ChangeTime; 1003 } 1004 1005 if (open_file) 1006 goto set_via_filehandle; 1007 1008 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls, 1009 cifs_sb); 1010 if (rc == 0) { 1011 cinode->cifsAttrs = le32_to_cpu(buf->Attributes); 1012 goto out; 1013 } else if (rc != -EOPNOTSUPP && rc != -EINVAL) { 1014 goto out; 1015 } 1016 1017 oparms = (struct cifs_open_parms) { 1018 .tcon = tcon, 1019 .cifs_sb = cifs_sb, 1020 .desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES, 1021 .create_options = cifs_create_options(cifs_sb, 0), 1022 .disposition = FILE_OPEN, 1023 .path = full_path, 1024 .fid = &fid, 1025 }; 1026 1027 if (S_ISDIR(inode->i_mode) && !(tcon->ses->capabilities & CAP_NT_SMBS)) { 1028 /* Opening directory path is not possible on non-NT servers. */ 1029 rc = -EOPNOTSUPP; 1030 } else { 1031 /* 1032 * Use cifs_open_file() instead of CIFS_open() as the 1033 * cifs_open_file() selects the correct function which 1034 * works also on non-NT servers. 1035 */ 1036 rc = cifs_open_file(xid, &oparms, &oplock, NULL); 1037 /* 1038 * Opening path for writing on non-NT servers is not 1039 * possible when the read-only attribute is already set. 1040 * Non-NT server in this case returns -EACCES. For those 1041 * servers the only possible way how to clear the read-only 1042 * bit is via SMB_COM_SETATTR command. 1043 */ 1044 if (rc == -EACCES && 1045 (cinode->cifsAttrs & ATTR_READONLY) && 1046 le32_to_cpu(buf->Attributes) != 0 && /* 0 = do not change attrs */ 1047 !(le32_to_cpu(buf->Attributes) & ATTR_READONLY) && 1048 !(tcon->ses->capabilities & CAP_NT_SMBS)) 1049 rc = -EOPNOTSUPP; 1050 } 1051 1052 /* Fallback to SMB_COM_SETATTR command when absolutely needed. */ 1053 if (rc == -EOPNOTSUPP) { 1054 cifs_dbg(FYI, "calling SetInformation since SetPathInfo for attrs/times not supported by this server\n"); 1055 rc = SMBSetInformation(xid, tcon, full_path, 1056 buf->Attributes != 0 ? buf->Attributes : cpu_to_le32(cinode->cifsAttrs), 1057 write_time, 1058 cifs_sb->local_nls, cifs_sb); 1059 if (rc == 0) 1060 cinode->cifsAttrs = le32_to_cpu(buf->Attributes); 1061 else 1062 rc = -EACCES; 1063 goto out; 1064 } 1065 1066 if (rc != 0) { 1067 if (rc == -EIO) 1068 rc = -EINVAL; 1069 goto out; 1070 } 1071 1072 netpid = current->tgid; 1073 cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for attrs/times not supported by this server\n"); 1074 1075 set_via_filehandle: 1076 rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid); 1077 if (!rc) 1078 cinode->cifsAttrs = le32_to_cpu(buf->Attributes); 1079 1080 if (open_file == NULL) 1081 CIFSSMBClose(xid, tcon, fid.netfid); 1082 else 1083 cifsFileInfo_put(open_file); 1084 1085 /* 1086 * Setting the read-only bit is not honored on non-NT servers when done 1087 * via open-semantics. So for setting it, use SMB_COM_SETATTR command. 1088 * This command works only after the file is closed, so use it only when 1089 * operation was called without the filehandle. 1090 */ 1091 if (open_file == NULL && 1092 !(tcon->ses->capabilities & CAP_NT_SMBS) && 1093 le32_to_cpu(buf->Attributes) & ATTR_READONLY) { 1094 SMBSetInformation(xid, tcon, full_path, 1095 buf->Attributes, 1096 0 /* do not change write time */, 1097 cifs_sb->local_nls, cifs_sb); 1098 } 1099 out: 1100 if (tlink != NULL) 1101 cifs_put_tlink(tlink); 1102 return rc; 1103 } 1104 1105 static int 1106 cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon, 1107 struct cifsFileInfo *cfile) 1108 { 1109 return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid); 1110 } 1111 1112 static int 1113 cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon, 1114 const char *path, struct cifs_sb_info *cifs_sb, 1115 struct cifs_fid *fid, __u16 search_flags, 1116 struct cifs_search_info *srch_inf) 1117 { 1118 int rc; 1119 1120 rc = CIFSFindFirst(xid, tcon, path, cifs_sb, 1121 &fid->netfid, search_flags, srch_inf, true); 1122 if (rc) 1123 cifs_dbg(FYI, "find first failed=%d\n", rc); 1124 return rc; 1125 } 1126 1127 static int 1128 cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon, 1129 struct cifs_fid *fid, __u16 search_flags, 1130 struct cifs_search_info *srch_inf) 1131 { 1132 return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf); 1133 } 1134 1135 static int 1136 cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon, 1137 struct cifs_fid *fid) 1138 { 1139 return CIFSFindClose(xid, tcon, fid->netfid); 1140 } 1141 1142 static int 1143 cifs_oplock_response(struct cifs_tcon *tcon, __u64 persistent_fid, 1144 __u64 volatile_fid, __u16 net_fid, struct cifsInodeInfo *cinode) 1145 { 1146 return CIFSSMBLock(0, tcon, net_fid, current->tgid, 0, 0, 0, 0, 1147 LOCKING_ANDX_OPLOCK_RELEASE, false, CIFS_CACHE_READ(cinode) ? 1 : 0); 1148 } 1149 1150 static int 1151 cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon, 1152 const char *path, struct cifs_sb_info *cifs_sb, struct kstatfs *buf) 1153 { 1154 int rc = -EOPNOTSUPP; 1155 1156 buf->f_type = CIFS_SUPER_MAGIC; 1157 1158 /* 1159 * We could add a second check for a QFS Unix capability bit 1160 */ 1161 if ((tcon->ses->capabilities & CAP_UNIX) && 1162 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability))) 1163 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf); 1164 1165 /* 1166 * Only need to call the old QFSInfo if failed on newer one, 1167 * e.g. by OS/2. 1168 **/ 1169 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS)) 1170 rc = CIFSSMBQFSInfo(xid, tcon, buf); 1171 1172 /* 1173 * Some old Windows servers also do not support level 103, retry with 1174 * older level one if old server failed the previous call or we 1175 * bypassed it because we detected that this was an older LANMAN sess 1176 */ 1177 if (rc) 1178 rc = SMBOldQFSInfo(xid, tcon, buf); 1179 return rc; 1180 } 1181 1182 static int 1183 cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset, 1184 __u64 length, __u32 type, int lock, int unlock, bool wait) 1185 { 1186 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid, 1187 current->tgid, length, offset, unlock, lock, 1188 (__u8)type, wait, 0); 1189 } 1190 1191 static int 1192 cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon, 1193 const unsigned char *searchName, char **symlinkinfo, 1194 const struct nls_table *nls_codepage) 1195 { 1196 #ifdef CONFIG_CIFS_DFS_UPCALL 1197 int rc; 1198 struct dfs_info3_param referral = {0}; 1199 1200 rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage, &referral, 1201 0); 1202 1203 if (!rc) { 1204 *symlinkinfo = kstrdup(referral.node_name, GFP_KERNEL); 1205 free_dfs_info_param(&referral); 1206 if (!*symlinkinfo) 1207 rc = -ENOMEM; 1208 } 1209 return rc; 1210 #else /* No DFS support */ 1211 return -EREMOTE; 1212 #endif 1213 } 1214 1215 static int cifs_query_symlink(const unsigned int xid, 1216 struct cifs_tcon *tcon, 1217 struct cifs_sb_info *cifs_sb, 1218 const char *full_path, 1219 char **target_path) 1220 { 1221 int rc; 1222 1223 cifs_tcon_dbg(FYI, "%s: path=%s\n", __func__, full_path); 1224 1225 if (!cap_unix(tcon->ses)) 1226 return -EOPNOTSUPP; 1227 1228 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path, 1229 cifs_sb->local_nls, cifs_remap(cifs_sb)); 1230 if (rc == -EREMOTE) 1231 rc = cifs_unix_dfs_readlink(xid, tcon, full_path, 1232 target_path, cifs_sb->local_nls); 1233 return rc; 1234 } 1235 1236 static struct reparse_data_buffer *cifs_get_reparse_point_buffer(const struct kvec *rsp_iov, 1237 u32 *plen) 1238 { 1239 TRANSACT_IOCTL_RSP *io = rsp_iov->iov_base; 1240 *plen = le16_to_cpu(io->ByteCount); 1241 return (struct reparse_data_buffer *)((__u8 *)&io->hdr.Protocol + 1242 le32_to_cpu(io->DataOffset)); 1243 } 1244 1245 static bool 1246 cifs_is_read_op(__u32 oplock) 1247 { 1248 return oplock == OPLOCK_READ; 1249 } 1250 1251 static unsigned int 1252 cifs_wp_retry_size(struct inode *inode) 1253 { 1254 return CIFS_SB(inode->i_sb)->ctx->wsize; 1255 } 1256 1257 static bool 1258 cifs_dir_needs_close(struct cifsFileInfo *cfile) 1259 { 1260 return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle; 1261 } 1262 1263 static bool 1264 cifs_can_echo(struct TCP_Server_Info *server) 1265 { 1266 if (server->tcpStatus == CifsGood) 1267 return true; 1268 1269 return false; 1270 } 1271 1272 static int 1273 cifs_make_node(unsigned int xid, struct inode *inode, 1274 struct dentry *dentry, struct cifs_tcon *tcon, 1275 const char *full_path, umode_t mode, dev_t dev) 1276 { 1277 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 1278 struct inode *newinode = NULL; 1279 int rc; 1280 1281 if (tcon->unix_ext) { 1282 /* 1283 * SMB1 Unix Extensions: requires server support but 1284 * works with all special files 1285 */ 1286 struct cifs_unix_set_info_args args = { 1287 .mode = mode & ~current_umask(), 1288 .ctime = NO_CHANGE_64, 1289 .atime = NO_CHANGE_64, 1290 .mtime = NO_CHANGE_64, 1291 .device = dev, 1292 }; 1293 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { 1294 args.uid = current_fsuid(); 1295 args.gid = current_fsgid(); 1296 } else { 1297 args.uid = INVALID_UID; /* no change */ 1298 args.gid = INVALID_GID; /* no change */ 1299 } 1300 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, 1301 cifs_sb->local_nls, 1302 cifs_remap(cifs_sb)); 1303 if (rc) 1304 return rc; 1305 1306 rc = cifs_get_inode_info_unix(&newinode, full_path, 1307 inode->i_sb, xid); 1308 1309 if (rc == 0) 1310 d_instantiate(dentry, newinode); 1311 return rc; 1312 } else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) { 1313 /* 1314 * Check if mounted with mount parm 'sfu' mount parm. 1315 * SFU emulation should work with all servers 1316 * and was used by default in earlier versions of Windows. 1317 */ 1318 return cifs_sfu_make_node(xid, inode, dentry, tcon, 1319 full_path, mode, dev); 1320 } else if (CIFS_REPARSE_SUPPORT(tcon)) { 1321 /* 1322 * mknod via reparse points requires server support for 1323 * storing reparse points, which is available since 1324 * Windows 2000, but was not widely used until release 1325 * of Windows Server 2012 by the Windows NFS server. 1326 */ 1327 return mknod_reparse(xid, inode, dentry, tcon, 1328 full_path, mode, dev); 1329 } else { 1330 return -EOPNOTSUPP; 1331 } 1332 } 1333 1334 static bool 1335 cifs_is_network_name_deleted(char *buf, struct TCP_Server_Info *server) 1336 { 1337 struct smb_hdr *shdr = (struct smb_hdr *)buf; 1338 struct TCP_Server_Info *pserver; 1339 struct cifs_ses *ses; 1340 struct cifs_tcon *tcon; 1341 1342 if (shdr->Flags2 & SMBFLG2_ERR_STATUS) { 1343 if (shdr->Status.CifsError != cpu_to_le32(NT_STATUS_NETWORK_NAME_DELETED)) 1344 return false; 1345 } else { 1346 if (shdr->Status.DosError.ErrorClass != ERRSRV || 1347 shdr->Status.DosError.Error != cpu_to_le16(ERRinvtid)) 1348 return false; 1349 } 1350 1351 /* If server is a channel, select the primary channel */ 1352 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 1353 1354 spin_lock(&cifs_tcp_ses_lock); 1355 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { 1356 if (cifs_ses_exiting(ses)) 1357 continue; 1358 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { 1359 if (tcon->tid == shdr->Tid) { 1360 spin_lock(&tcon->tc_lock); 1361 tcon->need_reconnect = true; 1362 spin_unlock(&tcon->tc_lock); 1363 spin_unlock(&cifs_tcp_ses_lock); 1364 pr_warn_once("Server share %s deleted.\n", 1365 tcon->tree_name); 1366 return true; 1367 } 1368 } 1369 } 1370 spin_unlock(&cifs_tcp_ses_lock); 1371 1372 return false; 1373 } 1374 1375 struct smb_version_operations smb1_operations = { 1376 .send_cancel = cifs_send_cancel, 1377 .compare_fids = cifs_compare_fids, 1378 .setup_request = cifs_setup_request, 1379 .setup_async_request = cifs_setup_async_request, 1380 .check_receive = cifs_check_receive, 1381 .add_credits = cifs_add_credits, 1382 .set_credits = cifs_set_credits, 1383 .get_credits_field = cifs_get_credits_field, 1384 .get_credits = cifs_get_credits, 1385 .wait_mtu_credits = cifs_wait_mtu_credits, 1386 .get_next_mid = cifs_get_next_mid, 1387 .read_data_offset = cifs_read_data_offset, 1388 .read_data_length = cifs_read_data_length, 1389 .map_error = map_smb_to_linux_error, 1390 .find_mid = cifs_find_mid, 1391 .check_message = checkSMB, 1392 .dump_detail = cifs_dump_detail, 1393 .clear_stats = cifs_clear_stats, 1394 .print_stats = cifs_print_stats, 1395 .is_oplock_break = is_valid_oplock_break, 1396 .downgrade_oplock = cifs_downgrade_oplock, 1397 .check_trans2 = cifs_check_trans2, 1398 .need_neg = cifs_need_neg, 1399 .negotiate = cifs_negotiate, 1400 .negotiate_wsize = smb1_negotiate_wsize, 1401 .negotiate_rsize = smb1_negotiate_rsize, 1402 .sess_setup = CIFS_SessSetup, 1403 .logoff = CIFSSMBLogoff, 1404 .tree_connect = CIFSTCon, 1405 .tree_disconnect = CIFSSMBTDis, 1406 .get_dfs_refer = CIFSGetDFSRefer, 1407 .qfs_tcon = cifs_qfs_tcon, 1408 .is_path_accessible = cifs_is_path_accessible, 1409 .can_echo = cifs_can_echo, 1410 .query_path_info = cifs_query_path_info, 1411 .query_reparse_point = cifs_query_reparse_point, 1412 .query_file_info = cifs_query_file_info, 1413 .get_srv_inum = cifs_get_srv_inum, 1414 .set_path_size = CIFSSMBSetEOF, 1415 .set_file_size = CIFSSMBSetFileSize, 1416 .set_file_info = smb_set_file_info, 1417 .set_compression = cifs_set_compression, 1418 .echo = CIFSSMBEcho, 1419 .mkdir = CIFSSMBMkDir, 1420 .mkdir_setinfo = cifs_mkdir_setinfo, 1421 .rmdir = CIFSSMBRmDir, 1422 .unlink = CIFSSMBDelFile, 1423 .rename_pending_delete = cifs_rename_pending_delete, 1424 .rename = CIFSSMBRename, 1425 .create_hardlink = CIFSCreateHardLink, 1426 .query_symlink = cifs_query_symlink, 1427 .get_reparse_point_buffer = cifs_get_reparse_point_buffer, 1428 .create_reparse_inode = cifs_create_reparse_inode, 1429 .open = cifs_open_file, 1430 .set_fid = cifs_set_fid, 1431 .close = cifs_close_file, 1432 .flush = cifs_flush_file, 1433 .async_readv = cifs_async_readv, 1434 .async_writev = cifs_async_writev, 1435 .sync_read = cifs_sync_read, 1436 .sync_write = cifs_sync_write, 1437 .query_dir_first = cifs_query_dir_first, 1438 .query_dir_next = cifs_query_dir_next, 1439 .close_dir = cifs_close_dir, 1440 .calc_smb_size = smbCalcSize, 1441 .oplock_response = cifs_oplock_response, 1442 .queryfs = cifs_queryfs, 1443 .mand_lock = cifs_mand_lock, 1444 .mand_unlock_range = cifs_unlock_range, 1445 .push_mand_locks = cifs_push_mandatory_locks, 1446 .query_mf_symlink = cifs_query_mf_symlink, 1447 .create_mf_symlink = cifs_create_mf_symlink, 1448 .is_read_op = cifs_is_read_op, 1449 .wp_retry_size = cifs_wp_retry_size, 1450 .dir_needs_close = cifs_dir_needs_close, 1451 .select_sectype = cifs_select_sectype, 1452 #ifdef CONFIG_CIFS_XATTR 1453 .query_all_EAs = CIFSSMBQAllEAs, 1454 .set_EA = CIFSSMBSetEA, 1455 #endif /* CIFS_XATTR */ 1456 .get_acl = get_cifs_acl, 1457 .get_acl_by_fid = get_cifs_acl_by_fid, 1458 .set_acl = set_cifs_acl, 1459 .make_node = cifs_make_node, 1460 .is_network_name_deleted = cifs_is_network_name_deleted, 1461 }; 1462 1463 struct smb_version_values smb1_values = { 1464 .version_string = SMB1_VERSION_STRING, 1465 .protocol_id = SMB10_PROT_ID, 1466 .large_lock_type = LOCKING_ANDX_LARGE_FILES, 1467 .exclusive_lock_type = 0, 1468 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK, 1469 .unlock_lock_type = 0, 1470 .header_size = sizeof(struct smb_hdr), 1471 .max_header_size = MAX_CIFS_HDR_SIZE, 1472 .read_rsp_size = sizeof(READ_RSP), 1473 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX), 1474 .cap_unix = CAP_UNIX, 1475 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND, 1476 .cap_large_files = CAP_LARGE_FILES, 1477 .cap_unicode = CAP_UNICODE, 1478 .signing_enabled = SECMODE_SIGN_ENABLED, 1479 .signing_required = SECMODE_SIGN_REQUIRED, 1480 }; 1481