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 <uapi/linux/magic.h> 11 #include "cifsglob.h" 12 #include "cifsproto.h" 13 #include "cifs_debug.h" 14 #include "cifspdu.h" 15 #include "cifs_unicode.h" 16 #include "fs_context.h" 17 #include "nterr.h" 18 #include "smberr.h" 19 20 /* 21 * An NT cancel request header looks just like the original request except: 22 * 23 * The Command is SMB_COM_NT_CANCEL 24 * The WordCount is zeroed out 25 * The ByteCount is zeroed out 26 * 27 * This function mangles an existing request buffer into a 28 * SMB_COM_NT_CANCEL request and then sends it. 29 */ 30 static int 31 send_nt_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, 32 struct mid_q_entry *mid) 33 { 34 int rc = 0; 35 struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base; 36 37 /* -4 for RFC1001 length and +2 for BCC field */ 38 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2); 39 in_buf->Command = SMB_COM_NT_CANCEL; 40 in_buf->WordCount = 0; 41 put_bcc(0, in_buf); 42 43 cifs_server_lock(server); 44 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); 45 if (rc) { 46 cifs_server_unlock(server); 47 return rc; 48 } 49 50 /* 51 * The response to this call was already factored into the sequence 52 * number when the call went out, so we must adjust it back downward 53 * after signing here. 54 */ 55 --server->sequence_number; 56 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); 57 if (rc < 0) 58 server->sequence_number--; 59 60 cifs_server_unlock(server); 61 62 cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n", 63 get_mid(in_buf), rc); 64 65 return rc; 66 } 67 68 static bool 69 cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2) 70 { 71 return ob1->fid.netfid == ob2->fid.netfid; 72 } 73 74 static unsigned int 75 cifs_read_data_offset(char *buf) 76 { 77 READ_RSP *rsp = (READ_RSP *)buf; 78 return le16_to_cpu(rsp->DataOffset); 79 } 80 81 static unsigned int 82 cifs_read_data_length(char *buf, bool in_remaining) 83 { 84 READ_RSP *rsp = (READ_RSP *)buf; 85 /* It's a bug reading remaining data for SMB1 packets */ 86 WARN_ON(in_remaining); 87 return (le16_to_cpu(rsp->DataLengthHigh) << 16) + 88 le16_to_cpu(rsp->DataLength); 89 } 90 91 static struct mid_q_entry * 92 cifs_find_mid(struct TCP_Server_Info *server, char *buffer) 93 { 94 struct smb_hdr *buf = (struct smb_hdr *)buffer; 95 struct mid_q_entry *mid; 96 97 spin_lock(&server->mid_lock); 98 list_for_each_entry(mid, &server->pending_mid_q, qhead) { 99 if (compare_mid(mid->mid, buf) && 100 mid->mid_state == MID_REQUEST_SUBMITTED && 101 le16_to_cpu(mid->command) == buf->Command) { 102 kref_get(&mid->refcount); 103 spin_unlock(&server->mid_lock); 104 return mid; 105 } 106 } 107 spin_unlock(&server->mid_lock); 108 return NULL; 109 } 110 111 static void 112 cifs_add_credits(struct TCP_Server_Info *server, 113 struct cifs_credits *credits, const int optype) 114 { 115 spin_lock(&server->req_lock); 116 server->credits += credits->value; 117 server->in_flight--; 118 spin_unlock(&server->req_lock); 119 wake_up(&server->request_q); 120 } 121 122 static void 123 cifs_set_credits(struct TCP_Server_Info *server, const int val) 124 { 125 spin_lock(&server->req_lock); 126 server->credits = val; 127 server->oplocks = val > 1 ? enable_oplocks : false; 128 spin_unlock(&server->req_lock); 129 } 130 131 static int * 132 cifs_get_credits_field(struct TCP_Server_Info *server, const int optype) 133 { 134 return &server->credits; 135 } 136 137 static unsigned int 138 cifs_get_credits(struct mid_q_entry *mid) 139 { 140 return 1; 141 } 142 143 /* 144 * Find a free multiplex id (SMB mid). Otherwise there could be 145 * mid collisions which might cause problems, demultiplexing the 146 * wrong response to this request. Multiplex ids could collide if 147 * one of a series requests takes much longer than the others, or 148 * if a very large number of long lived requests (byte range 149 * locks or FindNotify requests) are pending. No more than 150 * 64K-1 requests can be outstanding at one time. If no 151 * mids are available, return zero. A future optimization 152 * could make the combination of mids and uid the key we use 153 * to demultiplex on (rather than mid alone). 154 * In addition to the above check, the cifs demultiplex 155 * code already used the command code as a secondary 156 * check of the frame and if signing is negotiated the 157 * response would be discarded if the mid were the same 158 * but the signature was wrong. Since the mid is not put in the 159 * pending queue until later (when it is about to be dispatched) 160 * we do have to limit the number of outstanding requests 161 * to somewhat less than 64K-1 although it is hard to imagine 162 * so many threads being in the vfs at one time. 163 */ 164 static __u64 165 cifs_get_next_mid(struct TCP_Server_Info *server) 166 { 167 __u64 mid = 0; 168 __u16 last_mid, cur_mid; 169 bool collision, reconnect = false; 170 171 spin_lock(&server->mid_lock); 172 173 /* mid is 16 bit only for CIFS/SMB */ 174 cur_mid = (__u16)((server->CurrentMid) & 0xffff); 175 /* we do not want to loop forever */ 176 last_mid = cur_mid; 177 cur_mid++; 178 /* avoid 0xFFFF MID */ 179 if (cur_mid == 0xffff) 180 cur_mid++; 181 182 /* 183 * This nested loop looks more expensive than it is. 184 * In practice the list of pending requests is short, 185 * fewer than 50, and the mids are likely to be unique 186 * on the first pass through the loop unless some request 187 * takes longer than the 64 thousand requests before it 188 * (and it would also have to have been a request that 189 * did not time out). 190 */ 191 while (cur_mid != last_mid) { 192 struct mid_q_entry *mid_entry; 193 unsigned int num_mids; 194 195 collision = false; 196 if (cur_mid == 0) 197 cur_mid++; 198 199 num_mids = 0; 200 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) { 201 ++num_mids; 202 if (mid_entry->mid == cur_mid && 203 mid_entry->mid_state == MID_REQUEST_SUBMITTED) { 204 /* This mid is in use, try a different one */ 205 collision = true; 206 break; 207 } 208 } 209 210 /* 211 * if we have more than 32k mids in the list, then something 212 * is very wrong. Possibly a local user is trying to DoS the 213 * box by issuing long-running calls and SIGKILL'ing them. If 214 * we get to 2^16 mids then we're in big trouble as this 215 * function could loop forever. 216 * 217 * Go ahead and assign out the mid in this situation, but force 218 * an eventual reconnect to clean out the pending_mid_q. 219 */ 220 if (num_mids > 32768) 221 reconnect = true; 222 223 if (!collision) { 224 mid = (__u64)cur_mid; 225 server->CurrentMid = mid; 226 break; 227 } 228 cur_mid++; 229 } 230 spin_unlock(&server->mid_lock); 231 232 if (reconnect) { 233 cifs_signal_cifsd_for_reconnect(server, false); 234 } 235 236 return mid; 237 } 238 239 /* 240 return codes: 241 0 not a transact2, or all data present 242 >0 transact2 with that much data missing 243 -EINVAL invalid transact2 244 */ 245 static int 246 check2ndT2(char *buf) 247 { 248 struct smb_hdr *pSMB = (struct smb_hdr *)buf; 249 struct smb_t2_rsp *pSMBt; 250 int remaining; 251 __u16 total_data_size, data_in_this_rsp; 252 253 if (pSMB->Command != SMB_COM_TRANSACTION2) 254 return 0; 255 256 /* check for plausible wct, bcc and t2 data and parm sizes */ 257 /* check for parm and data offset going beyond end of smb */ 258 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */ 259 cifs_dbg(FYI, "Invalid transact2 word count\n"); 260 return -EINVAL; 261 } 262 263 pSMBt = (struct smb_t2_rsp *)pSMB; 264 265 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount); 266 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount); 267 268 if (total_data_size == data_in_this_rsp) 269 return 0; 270 else if (total_data_size < data_in_this_rsp) { 271 cifs_dbg(FYI, "total data %d smaller than data in frame %d\n", 272 total_data_size, data_in_this_rsp); 273 return -EINVAL; 274 } 275 276 remaining = total_data_size - data_in_this_rsp; 277 278 cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n", 279 remaining); 280 if (total_data_size > CIFSMaxBufSize) { 281 cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n", 282 total_data_size, CIFSMaxBufSize); 283 return -EINVAL; 284 } 285 return remaining; 286 } 287 288 static int 289 coalesce_t2(char *second_buf, struct smb_hdr *target_hdr) 290 { 291 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf; 292 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr; 293 char *data_area_of_tgt; 294 char *data_area_of_src; 295 int remaining; 296 unsigned int byte_count, total_in_tgt; 297 __u16 tgt_total_cnt, src_total_cnt, total_in_src; 298 299 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount); 300 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount); 301 302 if (tgt_total_cnt != src_total_cnt) 303 cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n", 304 src_total_cnt, tgt_total_cnt); 305 306 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount); 307 308 remaining = tgt_total_cnt - total_in_tgt; 309 310 if (remaining < 0) { 311 cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%u\n", 312 tgt_total_cnt, total_in_tgt); 313 return -EPROTO; 314 } 315 316 if (remaining == 0) { 317 /* nothing to do, ignore */ 318 cifs_dbg(FYI, "no more data remains\n"); 319 return 0; 320 } 321 322 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount); 323 if (remaining < total_in_src) 324 cifs_dbg(FYI, "transact2 2nd response contains too much data\n"); 325 326 /* find end of first SMB data area */ 327 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol + 328 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset); 329 330 /* validate target area */ 331 data_area_of_src = (char *)&pSMBs->hdr.Protocol + 332 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset); 333 334 data_area_of_tgt += total_in_tgt; 335 336 total_in_tgt += total_in_src; 337 /* is the result too big for the field? */ 338 if (total_in_tgt > USHRT_MAX) { 339 cifs_dbg(FYI, "coalesced DataCount too large (%u)\n", 340 total_in_tgt); 341 return -EPROTO; 342 } 343 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount); 344 345 /* fix up the BCC */ 346 byte_count = get_bcc(target_hdr); 347 byte_count += total_in_src; 348 /* is the result too big for the field? */ 349 if (byte_count > USHRT_MAX) { 350 cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count); 351 return -EPROTO; 352 } 353 put_bcc(byte_count, target_hdr); 354 355 byte_count = be32_to_cpu(target_hdr->smb_buf_length); 356 byte_count += total_in_src; 357 /* don't allow buffer to overflow */ 358 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { 359 cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n", 360 byte_count); 361 return -ENOBUFS; 362 } 363 target_hdr->smb_buf_length = cpu_to_be32(byte_count); 364 365 /* copy second buffer into end of first buffer */ 366 memcpy(data_area_of_tgt, data_area_of_src, total_in_src); 367 368 if (remaining != total_in_src) { 369 /* more responses to go */ 370 cifs_dbg(FYI, "waiting for more secondary responses\n"); 371 return 1; 372 } 373 374 /* we are done */ 375 cifs_dbg(FYI, "found the last secondary response\n"); 376 return 0; 377 } 378 379 static void 380 cifs_downgrade_oplock(struct TCP_Server_Info *server, 381 struct cifsInodeInfo *cinode, __u32 oplock, 382 __u16 epoch, bool *purge_cache) 383 { 384 cifs_set_oplock_level(cinode, oplock); 385 } 386 387 static bool 388 cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server, 389 char *buf, int malformed) 390 { 391 if (malformed) 392 return false; 393 if (check2ndT2(buf) <= 0) 394 return false; 395 mid->multiRsp = true; 396 if (mid->resp_buf) { 397 /* merge response - fix up 1st*/ 398 malformed = coalesce_t2(buf, mid->resp_buf); 399 if (malformed > 0) 400 return true; 401 /* All parts received or packet is malformed. */ 402 mid->multiEnd = true; 403 dequeue_mid(mid, malformed); 404 return true; 405 } 406 if (!server->large_buf) { 407 /*FIXME: switch to already allocated largebuf?*/ 408 cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n"); 409 } else { 410 /* Have first buffer */ 411 mid->resp_buf = buf; 412 mid->large_buf = true; 413 server->bigbuf = NULL; 414 } 415 return true; 416 } 417 418 static bool 419 cifs_need_neg(struct TCP_Server_Info *server) 420 { 421 return server->maxBuf == 0; 422 } 423 424 static int 425 cifs_negotiate(const unsigned int xid, 426 struct cifs_ses *ses, 427 struct TCP_Server_Info *server) 428 { 429 int rc; 430 rc = CIFSSMBNegotiate(xid, ses, server); 431 return rc; 432 } 433 434 static unsigned int 435 smb1_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) 436 { 437 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); 438 struct TCP_Server_Info *server = tcon->ses->server; 439 unsigned int wsize; 440 441 /* start with specified wsize, or default */ 442 if (ctx->got_wsize) 443 wsize = ctx->vol_wsize; 444 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) 445 wsize = CIFS_DEFAULT_IOSIZE; 446 else 447 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE; 448 449 /* can server support 24-bit write sizes? (via UNIX extensions) */ 450 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) 451 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE); 452 453 /* 454 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set? 455 * Limit it to max buffer offered by the server, minus the size of the 456 * WRITEX header, not including the 4 byte RFC1001 length. 457 */ 458 if (!(server->capabilities & CAP_LARGE_WRITE_X) || 459 (!(server->capabilities & CAP_UNIX) && server->sign)) 460 wsize = min_t(unsigned int, wsize, 461 server->maxBuf - sizeof(WRITE_REQ) + 4); 462 463 /* hard limit of CIFS_MAX_WSIZE */ 464 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE); 465 466 return wsize; 467 } 468 469 static unsigned int 470 smb1_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) 471 { 472 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); 473 struct TCP_Server_Info *server = tcon->ses->server; 474 unsigned int rsize, defsize; 475 476 /* 477 * Set default value... 478 * 479 * HACK alert! Ancient servers have very small buffers. Even though 480 * MS-CIFS indicates that servers are only limited by the client's 481 * bufsize for reads, testing against win98se shows that it throws 482 * INVALID_PARAMETER errors if you try to request too large a read. 483 * OS/2 just sends back short reads. 484 * 485 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that 486 * it can't handle a read request larger than its MaxBufferSize either. 487 */ 488 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP)) 489 defsize = CIFS_DEFAULT_IOSIZE; 490 else if (server->capabilities & CAP_LARGE_READ_X) 491 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE; 492 else 493 defsize = server->maxBuf - sizeof(READ_RSP); 494 495 rsize = ctx->got_rsize ? ctx->vol_rsize : defsize; 496 497 /* 498 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to 499 * the client's MaxBufferSize. 500 */ 501 if (!(server->capabilities & CAP_LARGE_READ_X)) 502 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize); 503 504 /* hard limit of CIFS_MAX_RSIZE */ 505 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE); 506 507 return rsize; 508 } 509 510 static void 511 cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon, 512 struct cifs_sb_info *cifs_sb) 513 { 514 CIFSSMBQFSDeviceInfo(xid, tcon); 515 CIFSSMBQFSAttributeInfo(xid, tcon); 516 } 517 518 static int 519 cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon, 520 struct cifs_sb_info *cifs_sb, const char *full_path) 521 { 522 int rc; 523 FILE_ALL_INFO *file_info; 524 525 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); 526 if (file_info == NULL) 527 return -ENOMEM; 528 529 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info, 530 0 /* not legacy */, cifs_sb->local_nls, 531 cifs_remap(cifs_sb)); 532 533 if (rc == -EOPNOTSUPP || rc == -EINVAL) 534 rc = SMBQueryInformation(xid, tcon, full_path, file_info, 535 cifs_sb->local_nls, cifs_remap(cifs_sb)); 536 kfree(file_info); 537 return rc; 538 } 539 540 static int cifs_query_path_info(const unsigned int xid, 541 struct cifs_tcon *tcon, 542 struct cifs_sb_info *cifs_sb, 543 const char *full_path, 544 struct cifs_open_info_data *data) 545 { 546 int rc = -EOPNOTSUPP; 547 FILE_ALL_INFO fi = {}; 548 struct cifs_search_info search_info = {}; 549 bool non_unicode_wildcard = false; 550 551 data->reparse_point = false; 552 data->adjust_tz = false; 553 554 /* 555 * First try CIFSSMBQPathInfo() function which returns more info 556 * (NumberOfLinks) than CIFSFindFirst() fallback function. 557 * Some servers like Win9x do not support SMB_QUERY_FILE_ALL_INFO over 558 * TRANS2_QUERY_PATH_INFORMATION, but supports it with filehandle over 559 * TRANS2_QUERY_FILE_INFORMATION (function CIFSSMBQFileInfo(). But SMB 560 * Open command on non-NT servers works only for files, does not work 561 * for directories. And moreover Win9x SMB server returns bogus data in 562 * SMB_QUERY_FILE_ALL_INFO Attributes field. So for non-NT servers, 563 * do not even use CIFSSMBQPathInfo() or CIFSSMBQFileInfo() function. 564 */ 565 if (tcon->ses->capabilities & CAP_NT_SMBS) 566 rc = CIFSSMBQPathInfo(xid, tcon, full_path, &fi, 0 /* not legacy */, 567 cifs_sb->local_nls, cifs_remap(cifs_sb)); 568 569 /* 570 * Non-UNICODE variant of fallback functions below expands wildcards, 571 * so they cannot be used for querying paths with wildcard characters. 572 */ 573 if (rc && !(tcon->ses->capabilities & CAP_UNICODE) && strpbrk(full_path, "*?\"><")) 574 non_unicode_wildcard = true; 575 576 /* 577 * Then fallback to CIFSFindFirst() which works also with non-NT servers 578 * but does not does not provide NumberOfLinks. 579 */ 580 if ((rc == -EOPNOTSUPP || rc == -EINVAL) && 581 !non_unicode_wildcard) { 582 if (!(tcon->ses->capabilities & tcon->ses->server->vals->cap_nt_find)) 583 search_info.info_level = SMB_FIND_FILE_INFO_STANDARD; 584 else 585 search_info.info_level = SMB_FIND_FILE_FULL_DIRECTORY_INFO; 586 rc = CIFSFindFirst(xid, tcon, full_path, cifs_sb, NULL, 587 CIFS_SEARCH_CLOSE_ALWAYS | CIFS_SEARCH_CLOSE_AT_END, 588 &search_info, false); 589 if (rc == 0) { 590 if (!(tcon->ses->capabilities & tcon->ses->server->vals->cap_nt_find)) { 591 FIND_FILE_STANDARD_INFO *di; 592 int offset = tcon->ses->server->timeAdj; 593 594 di = (FIND_FILE_STANDARD_INFO *)search_info.srch_entries_start; 595 fi.CreationTime = cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm( 596 di->CreationDate, di->CreationTime, offset))); 597 fi.LastAccessTime = cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm( 598 di->LastAccessDate, di->LastAccessTime, offset))); 599 fi.LastWriteTime = cpu_to_le64(cifs_UnixTimeToNT(cnvrtDosUnixTm( 600 di->LastWriteDate, di->LastWriteTime, offset))); 601 fi.ChangeTime = fi.LastWriteTime; 602 fi.Attributes = cpu_to_le32(le16_to_cpu(di->Attributes)); 603 fi.AllocationSize = cpu_to_le64(le32_to_cpu(di->AllocationSize)); 604 fi.EndOfFile = cpu_to_le64(le32_to_cpu(di->DataSize)); 605 } else { 606 FILE_FULL_DIRECTORY_INFO *di; 607 608 di = (FILE_FULL_DIRECTORY_INFO *)search_info.srch_entries_start; 609 fi.CreationTime = di->CreationTime; 610 fi.LastAccessTime = di->LastAccessTime; 611 fi.LastWriteTime = di->LastWriteTime; 612 fi.ChangeTime = di->ChangeTime; 613 fi.Attributes = di->ExtFileAttributes; 614 fi.AllocationSize = di->AllocationSize; 615 fi.EndOfFile = di->EndOfFile; 616 fi.EASize = di->EaSize; 617 } 618 fi.NumberOfLinks = cpu_to_le32(1); 619 fi.DeletePending = 0; 620 fi.Directory = !!(le32_to_cpu(fi.Attributes) & ATTR_DIRECTORY); 621 cifs_buf_release(search_info.ntwrk_buf_start); 622 } else if (!full_path[0]) { 623 /* 624 * CIFSFindFirst() does not work on root path if the 625 * root path was exported on the server from the top 626 * level path (drive letter). 627 */ 628 rc = -EOPNOTSUPP; 629 } 630 } 631 632 /* 633 * If everything failed then fallback to the legacy SMB command 634 * SMB_COM_QUERY_INFORMATION which works with all servers, but 635 * provide just few information. 636 */ 637 if ((rc == -EOPNOTSUPP || rc == -EINVAL) && !non_unicode_wildcard) { 638 rc = SMBQueryInformation(xid, tcon, full_path, &fi, cifs_sb->local_nls, 639 cifs_remap(cifs_sb)); 640 data->adjust_tz = true; 641 } else if ((rc == -EOPNOTSUPP || rc == -EINVAL) && non_unicode_wildcard) { 642 /* Path with non-UNICODE wildcard character cannot exist. */ 643 rc = -ENOENT; 644 } 645 646 if (!rc) { 647 move_cifs_info_to_smb2(&data->fi, &fi); 648 data->reparse_point = le32_to_cpu(fi.Attributes) & ATTR_REPARSE; 649 } 650 651 #ifdef CONFIG_CIFS_XATTR 652 /* 653 * For WSL CHR and BLK reparse points it is required to fetch 654 * EA $LXDEV which contains major and minor device numbers. 655 */ 656 if (!rc && data->reparse_point) { 657 struct smb2_file_full_ea_info *ea; 658 659 ea = (struct smb2_file_full_ea_info *)data->wsl.eas; 660 rc = CIFSSMBQAllEAs(xid, tcon, full_path, SMB2_WSL_XATTR_DEV, 661 &ea->ea_data[SMB2_WSL_XATTR_NAME_LEN + 1], 662 SMB2_WSL_XATTR_DEV_SIZE, cifs_sb); 663 if (rc == SMB2_WSL_XATTR_DEV_SIZE) { 664 ea->next_entry_offset = cpu_to_le32(0); 665 ea->flags = 0; 666 ea->ea_name_length = SMB2_WSL_XATTR_NAME_LEN; 667 ea->ea_value_length = cpu_to_le16(SMB2_WSL_XATTR_DEV_SIZE); 668 memcpy(&ea->ea_data[0], SMB2_WSL_XATTR_DEV, SMB2_WSL_XATTR_NAME_LEN + 1); 669 data->wsl.eas_len = sizeof(*ea) + SMB2_WSL_XATTR_NAME_LEN + 1 + 670 SMB2_WSL_XATTR_DEV_SIZE; 671 rc = 0; 672 } else if (rc >= 0) { 673 /* It is an error if EA $LXDEV has wrong size. */ 674 rc = -EINVAL; 675 } else { 676 /* 677 * In all other cases ignore error if fetching 678 * of EA $LXDEV failed. It is needed only for 679 * WSL CHR and BLK reparse points and wsl_to_fattr() 680 * handle the case when EA is missing. 681 */ 682 rc = 0; 683 } 684 } 685 #endif 686 687 return rc; 688 } 689 690 static int cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon, 691 struct cifs_sb_info *cifs_sb, const char *full_path, 692 u64 *uniqueid, struct cifs_open_info_data *unused) 693 { 694 /* 695 * We can not use the IndexNumber field by default from Windows or 696 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA 697 * CIFS spec claims that this value is unique within the scope of a 698 * share, and the windows docs hint that it's actually unique 699 * per-machine. 700 * 701 * There may be higher info levels that work but are there Windows 702 * server or network appliances for which IndexNumber field is not 703 * guaranteed unique? 704 * 705 * CIFSGetSrvInodeNumber() uses SMB_QUERY_FILE_INTERNAL_INFO 706 * which is SMB PASSTHROUGH level therefore check for capability. 707 * Note that this function can be called with tcon == NULL. 708 */ 709 if (tcon && !(tcon->ses->capabilities & CAP_INFOLEVEL_PASSTHRU)) 710 return -EOPNOTSUPP; 711 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid, 712 cifs_sb->local_nls, 713 cifs_remap(cifs_sb)); 714 } 715 716 static int cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon, 717 struct cifsFileInfo *cfile, struct cifs_open_info_data *data) 718 { 719 int rc; 720 FILE_ALL_INFO fi = {}; 721 722 /* 723 * CIFSSMBQFileInfo() for non-NT servers returns bogus data in 724 * Attributes fields. So do not use this command for non-NT servers. 725 */ 726 if (!(tcon->ses->capabilities & CAP_NT_SMBS)) 727 return -EOPNOTSUPP; 728 729 if (cfile->symlink_target) { 730 data->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL); 731 if (!data->symlink_target) 732 return -ENOMEM; 733 } 734 735 rc = CIFSSMBQFileInfo(xid, tcon, cfile->fid.netfid, &fi); 736 if (!rc) 737 move_cifs_info_to_smb2(&data->fi, &fi); 738 return rc; 739 } 740 741 static void 742 cifs_clear_stats(struct cifs_tcon *tcon) 743 { 744 atomic_set(&tcon->stats.cifs_stats.num_writes, 0); 745 atomic_set(&tcon->stats.cifs_stats.num_reads, 0); 746 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0); 747 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0); 748 atomic_set(&tcon->stats.cifs_stats.num_opens, 0); 749 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0); 750 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0); 751 atomic_set(&tcon->stats.cifs_stats.num_closes, 0); 752 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0); 753 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0); 754 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0); 755 atomic_set(&tcon->stats.cifs_stats.num_renames, 0); 756 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0); 757 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0); 758 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0); 759 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0); 760 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0); 761 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0); 762 atomic_set(&tcon->stats.cifs_stats.num_locks, 0); 763 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0); 764 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0); 765 } 766 767 static void 768 cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon) 769 { 770 seq_printf(m, " Oplocks breaks: %d", 771 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks)); 772 seq_printf(m, "\nReads: %d Bytes: %llu", 773 atomic_read(&tcon->stats.cifs_stats.num_reads), 774 (long long)(tcon->bytes_read)); 775 seq_printf(m, "\nWrites: %d Bytes: %llu", 776 atomic_read(&tcon->stats.cifs_stats.num_writes), 777 (long long)(tcon->bytes_written)); 778 seq_printf(m, "\nFlushes: %d", 779 atomic_read(&tcon->stats.cifs_stats.num_flushes)); 780 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d", 781 atomic_read(&tcon->stats.cifs_stats.num_locks), 782 atomic_read(&tcon->stats.cifs_stats.num_hardlinks), 783 atomic_read(&tcon->stats.cifs_stats.num_symlinks)); 784 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d", 785 atomic_read(&tcon->stats.cifs_stats.num_opens), 786 atomic_read(&tcon->stats.cifs_stats.num_closes), 787 atomic_read(&tcon->stats.cifs_stats.num_deletes)); 788 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d", 789 atomic_read(&tcon->stats.cifs_stats.num_posixopens), 790 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs)); 791 seq_printf(m, "\nMkdirs: %d Rmdirs: %d", 792 atomic_read(&tcon->stats.cifs_stats.num_mkdirs), 793 atomic_read(&tcon->stats.cifs_stats.num_rmdirs)); 794 seq_printf(m, "\nRenames: %d T2 Renames %d", 795 atomic_read(&tcon->stats.cifs_stats.num_renames), 796 atomic_read(&tcon->stats.cifs_stats.num_t2renames)); 797 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d", 798 atomic_read(&tcon->stats.cifs_stats.num_ffirst), 799 atomic_read(&tcon->stats.cifs_stats.num_fnext), 800 atomic_read(&tcon->stats.cifs_stats.num_fclose)); 801 } 802 803 static void 804 cifs_mkdir_setinfo(struct inode *inode, const char *full_path, 805 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon, 806 const unsigned int xid) 807 { 808 FILE_BASIC_INFO info; 809 struct cifsInodeInfo *cifsInode; 810 u32 dosattrs; 811 int rc; 812 813 memset(&info, 0, sizeof(info)); 814 cifsInode = CIFS_I(inode); 815 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY; 816 info.Attributes = cpu_to_le32(dosattrs); 817 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls, 818 cifs_sb); 819 if (rc == 0) 820 cifsInode->cifsAttrs = dosattrs; 821 } 822 823 static int cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, 824 void *buf) 825 { 826 struct cifs_open_info_data *data = buf; 827 FILE_ALL_INFO fi = {}; 828 int rc; 829 830 if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS)) 831 rc = SMBLegacyOpen(xid, oparms->tcon, oparms->path, 832 oparms->disposition, 833 oparms->desired_access, 834 oparms->create_options, 835 &oparms->fid->netfid, oplock, &fi, 836 oparms->cifs_sb->local_nls, 837 cifs_remap(oparms->cifs_sb)); 838 else 839 rc = CIFS_open(xid, oparms, oplock, &fi); 840 841 if (!rc && data) 842 move_cifs_info_to_smb2(&data->fi, &fi); 843 844 return rc; 845 } 846 847 static void 848 cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock) 849 { 850 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); 851 cfile->fid.netfid = fid->netfid; 852 cifs_set_oplock_level(cinode, oplock); 853 cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode); 854 } 855 856 static int 857 cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon, 858 struct cifs_fid *fid) 859 { 860 return CIFSSMBClose(xid, tcon, fid->netfid); 861 } 862 863 static int 864 cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon, 865 struct cifs_fid *fid) 866 { 867 return CIFSSMBFlush(xid, tcon, fid->netfid); 868 } 869 870 static int 871 cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid, 872 struct cifs_io_parms *parms, unsigned int *bytes_read, 873 char **buf, int *buf_type) 874 { 875 parms->netfid = pfid->netfid; 876 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type); 877 } 878 879 static int 880 cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid, 881 struct cifs_io_parms *parms, unsigned int *written, 882 struct kvec *iov, unsigned long nr_segs) 883 { 884 885 parms->netfid = pfid->netfid; 886 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs); 887 } 888 889 static int 890 smb_set_file_info(struct inode *inode, const char *full_path, 891 FILE_BASIC_INFO *buf, const unsigned int xid) 892 { 893 int oplock = 0; 894 int rc; 895 __u32 netpid; 896 struct cifs_fid fid; 897 struct cifs_open_parms oparms; 898 struct cifsFileInfo *open_file; 899 FILE_BASIC_INFO new_buf; 900 struct cifs_open_info_data query_data; 901 __le64 write_time = buf->LastWriteTime; 902 struct cifsInodeInfo *cinode = CIFS_I(inode); 903 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 904 struct tcon_link *tlink = NULL; 905 struct cifs_tcon *tcon; 906 907 /* if the file is already open for write, just use that fileid */ 908 open_file = find_writable_file(cinode, FIND_WR_FSUID_ONLY); 909 910 if (open_file) { 911 fid.netfid = open_file->fid.netfid; 912 netpid = open_file->pid; 913 tcon = tlink_tcon(open_file->tlink); 914 } else { 915 tlink = cifs_sb_tlink(cifs_sb); 916 if (IS_ERR(tlink)) { 917 rc = PTR_ERR(tlink); 918 tlink = NULL; 919 goto out; 920 } 921 tcon = tlink_tcon(tlink); 922 } 923 924 /* 925 * Non-NT servers interprets zero time value in SMB_SET_FILE_BASIC_INFO 926 * over TRANS2_SET_FILE_INFORMATION as a valid time value. NT servers 927 * interprets zero time value as do not change existing value on server. 928 * API of ->set_file_info() callback expects that zero time value has 929 * the NT meaning - do not change. Therefore if server is non-NT and 930 * some time values in "buf" are zero, then fetch missing time values. 931 */ 932 if (!(tcon->ses->capabilities & CAP_NT_SMBS) && 933 (!buf->CreationTime || !buf->LastAccessTime || 934 !buf->LastWriteTime || !buf->ChangeTime)) { 935 rc = cifs_query_path_info(xid, tcon, cifs_sb, full_path, &query_data); 936 if (rc) { 937 if (open_file) { 938 cifsFileInfo_put(open_file); 939 open_file = NULL; 940 } 941 goto out; 942 } 943 /* 944 * Original write_time from buf->LastWriteTime is preserved 945 * as SMBSetInformation() interprets zero as do not change. 946 */ 947 new_buf = *buf; 948 buf = &new_buf; 949 if (!buf->CreationTime) 950 buf->CreationTime = query_data.fi.CreationTime; 951 if (!buf->LastAccessTime) 952 buf->LastAccessTime = query_data.fi.LastAccessTime; 953 if (!buf->LastWriteTime) 954 buf->LastWriteTime = query_data.fi.LastWriteTime; 955 if (!buf->ChangeTime) 956 buf->ChangeTime = query_data.fi.ChangeTime; 957 } 958 959 if (open_file) 960 goto set_via_filehandle; 961 962 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls, 963 cifs_sb); 964 if (rc == 0) { 965 cinode->cifsAttrs = le32_to_cpu(buf->Attributes); 966 goto out; 967 } else if (rc != -EOPNOTSUPP && rc != -EINVAL) { 968 goto out; 969 } 970 971 oparms = (struct cifs_open_parms) { 972 .tcon = tcon, 973 .cifs_sb = cifs_sb, 974 .desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES, 975 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR), 976 .disposition = FILE_OPEN, 977 .path = full_path, 978 .fid = &fid, 979 }; 980 981 if (S_ISDIR(inode->i_mode) && !(tcon->ses->capabilities & CAP_NT_SMBS)) { 982 /* Opening directory path is not possible on non-NT servers. */ 983 rc = -EOPNOTSUPP; 984 } else { 985 /* 986 * Use cifs_open_file() instead of CIFS_open() as the 987 * cifs_open_file() selects the correct function which 988 * works also on non-NT servers. 989 */ 990 rc = cifs_open_file(xid, &oparms, &oplock, NULL); 991 /* 992 * Opening path for writing on non-NT servers is not 993 * possible when the read-only attribute is already set. 994 * Non-NT server in this case returns -EACCES. For those 995 * servers the only possible way how to clear the read-only 996 * bit is via SMB_COM_SETATTR command. 997 */ 998 if (rc == -EACCES && 999 (cinode->cifsAttrs & ATTR_READONLY) && 1000 le32_to_cpu(buf->Attributes) != 0 && /* 0 = do not change attrs */ 1001 !(le32_to_cpu(buf->Attributes) & ATTR_READONLY) && 1002 !(tcon->ses->capabilities & CAP_NT_SMBS)) 1003 rc = -EOPNOTSUPP; 1004 } 1005 1006 /* Fallback to SMB_COM_SETATTR command when absolutelty needed. */ 1007 if (rc == -EOPNOTSUPP) { 1008 cifs_dbg(FYI, "calling SetInformation since SetPathInfo for attrs/times not supported by this server\n"); 1009 rc = SMBSetInformation(xid, tcon, full_path, 1010 buf->Attributes != 0 ? buf->Attributes : cpu_to_le32(cinode->cifsAttrs), 1011 write_time, 1012 cifs_sb->local_nls, cifs_sb); 1013 if (rc == 0) 1014 cinode->cifsAttrs = le32_to_cpu(buf->Attributes); 1015 else 1016 rc = -EACCES; 1017 goto out; 1018 } 1019 1020 if (rc != 0) { 1021 if (rc == -EIO) 1022 rc = -EINVAL; 1023 goto out; 1024 } 1025 1026 netpid = current->tgid; 1027 cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for attrs/times not supported by this server\n"); 1028 1029 set_via_filehandle: 1030 rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid); 1031 if (!rc) 1032 cinode->cifsAttrs = le32_to_cpu(buf->Attributes); 1033 1034 if (open_file == NULL) 1035 CIFSSMBClose(xid, tcon, fid.netfid); 1036 else 1037 cifsFileInfo_put(open_file); 1038 1039 /* 1040 * Setting the read-only bit is not honered on non-NT servers when done 1041 * via open-semantics. So for setting it, use SMB_COM_SETATTR command. 1042 * This command works only after the file is closed, so use it only when 1043 * operation was called without the filehandle. 1044 */ 1045 if (open_file == NULL && 1046 !(tcon->ses->capabilities & CAP_NT_SMBS) && 1047 le32_to_cpu(buf->Attributes) & ATTR_READONLY) { 1048 SMBSetInformation(xid, tcon, full_path, 1049 buf->Attributes, 1050 0 /* do not change write time */, 1051 cifs_sb->local_nls, cifs_sb); 1052 } 1053 out: 1054 if (tlink != NULL) 1055 cifs_put_tlink(tlink); 1056 return rc; 1057 } 1058 1059 static int 1060 cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon, 1061 struct cifsFileInfo *cfile) 1062 { 1063 return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid); 1064 } 1065 1066 static int 1067 cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon, 1068 const char *path, struct cifs_sb_info *cifs_sb, 1069 struct cifs_fid *fid, __u16 search_flags, 1070 struct cifs_search_info *srch_inf) 1071 { 1072 int rc; 1073 1074 rc = CIFSFindFirst(xid, tcon, path, cifs_sb, 1075 &fid->netfid, search_flags, srch_inf, true); 1076 if (rc) 1077 cifs_dbg(FYI, "find first failed=%d\n", rc); 1078 return rc; 1079 } 1080 1081 static int 1082 cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon, 1083 struct cifs_fid *fid, __u16 search_flags, 1084 struct cifs_search_info *srch_inf) 1085 { 1086 return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf); 1087 } 1088 1089 static int 1090 cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon, 1091 struct cifs_fid *fid) 1092 { 1093 return CIFSFindClose(xid, tcon, fid->netfid); 1094 } 1095 1096 static int 1097 cifs_oplock_response(struct cifs_tcon *tcon, __u64 persistent_fid, 1098 __u64 volatile_fid, __u16 net_fid, struct cifsInodeInfo *cinode) 1099 { 1100 return CIFSSMBLock(0, tcon, net_fid, current->tgid, 0, 0, 0, 0, 1101 LOCKING_ANDX_OPLOCK_RELEASE, false, CIFS_CACHE_READ(cinode) ? 1 : 0); 1102 } 1103 1104 static int 1105 cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon, 1106 const char *path, struct cifs_sb_info *cifs_sb, struct kstatfs *buf) 1107 { 1108 int rc = -EOPNOTSUPP; 1109 1110 buf->f_type = CIFS_SUPER_MAGIC; 1111 1112 /* 1113 * We could add a second check for a QFS Unix capability bit 1114 */ 1115 if ((tcon->ses->capabilities & CAP_UNIX) && 1116 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability))) 1117 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf); 1118 1119 /* 1120 * Only need to call the old QFSInfo if failed on newer one, 1121 * e.g. by OS/2. 1122 **/ 1123 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS)) 1124 rc = CIFSSMBQFSInfo(xid, tcon, buf); 1125 1126 /* 1127 * Some old Windows servers also do not support level 103, retry with 1128 * older level one if old server failed the previous call or we 1129 * bypassed it because we detected that this was an older LANMAN sess 1130 */ 1131 if (rc) 1132 rc = SMBOldQFSInfo(xid, tcon, buf); 1133 return rc; 1134 } 1135 1136 static int 1137 cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset, 1138 __u64 length, __u32 type, int lock, int unlock, bool wait) 1139 { 1140 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid, 1141 current->tgid, length, offset, unlock, lock, 1142 (__u8)type, wait, 0); 1143 } 1144 1145 static int 1146 cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon, 1147 const unsigned char *searchName, char **symlinkinfo, 1148 const struct nls_table *nls_codepage) 1149 { 1150 #ifdef CONFIG_CIFS_DFS_UPCALL 1151 int rc; 1152 struct dfs_info3_param referral = {0}; 1153 1154 rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage, &referral, 1155 0); 1156 1157 if (!rc) { 1158 *symlinkinfo = kstrdup(referral.node_name, GFP_KERNEL); 1159 free_dfs_info_param(&referral); 1160 if (!*symlinkinfo) 1161 rc = -ENOMEM; 1162 } 1163 return rc; 1164 #else /* No DFS support */ 1165 return -EREMOTE; 1166 #endif 1167 } 1168 1169 static int cifs_query_symlink(const unsigned int xid, 1170 struct cifs_tcon *tcon, 1171 struct cifs_sb_info *cifs_sb, 1172 const char *full_path, 1173 char **target_path) 1174 { 1175 int rc; 1176 1177 cifs_tcon_dbg(FYI, "%s: path=%s\n", __func__, full_path); 1178 1179 if (!cap_unix(tcon->ses)) 1180 return -EOPNOTSUPP; 1181 1182 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path, 1183 cifs_sb->local_nls, cifs_remap(cifs_sb)); 1184 if (rc == -EREMOTE) 1185 rc = cifs_unix_dfs_readlink(xid, tcon, full_path, 1186 target_path, cifs_sb->local_nls); 1187 return rc; 1188 } 1189 1190 static struct reparse_data_buffer *cifs_get_reparse_point_buffer(const struct kvec *rsp_iov, 1191 u32 *plen) 1192 { 1193 TRANSACT_IOCTL_RSP *io = rsp_iov->iov_base; 1194 *plen = le16_to_cpu(io->ByteCount); 1195 return (struct reparse_data_buffer *)((__u8 *)&io->hdr.Protocol + 1196 le32_to_cpu(io->DataOffset)); 1197 } 1198 1199 static bool 1200 cifs_is_read_op(__u32 oplock) 1201 { 1202 return oplock == OPLOCK_READ; 1203 } 1204 1205 static unsigned int 1206 cifs_wp_retry_size(struct inode *inode) 1207 { 1208 return CIFS_SB(inode->i_sb)->ctx->wsize; 1209 } 1210 1211 static bool 1212 cifs_dir_needs_close(struct cifsFileInfo *cfile) 1213 { 1214 return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle; 1215 } 1216 1217 static bool 1218 cifs_can_echo(struct TCP_Server_Info *server) 1219 { 1220 if (server->tcpStatus == CifsGood) 1221 return true; 1222 1223 return false; 1224 } 1225 1226 static int 1227 cifs_make_node(unsigned int xid, struct inode *inode, 1228 struct dentry *dentry, struct cifs_tcon *tcon, 1229 const char *full_path, umode_t mode, dev_t dev) 1230 { 1231 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 1232 struct inode *newinode = NULL; 1233 int rc; 1234 1235 if (tcon->unix_ext) { 1236 /* 1237 * SMB1 Unix Extensions: requires server support but 1238 * works with all special files 1239 */ 1240 struct cifs_unix_set_info_args args = { 1241 .mode = mode & ~current_umask(), 1242 .ctime = NO_CHANGE_64, 1243 .atime = NO_CHANGE_64, 1244 .mtime = NO_CHANGE_64, 1245 .device = dev, 1246 }; 1247 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { 1248 args.uid = current_fsuid(); 1249 args.gid = current_fsgid(); 1250 } else { 1251 args.uid = INVALID_UID; /* no change */ 1252 args.gid = INVALID_GID; /* no change */ 1253 } 1254 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, 1255 cifs_sb->local_nls, 1256 cifs_remap(cifs_sb)); 1257 if (rc) 1258 return rc; 1259 1260 rc = cifs_get_inode_info_unix(&newinode, full_path, 1261 inode->i_sb, xid); 1262 1263 if (rc == 0) 1264 d_instantiate(dentry, newinode); 1265 return rc; 1266 } 1267 /* 1268 * Check if mounted with mount parm 'sfu' mount parm. 1269 * SFU emulation should work with all servers, but only 1270 * supports block and char device, socket & fifo, 1271 * and was used by default in earlier versions of Windows 1272 */ 1273 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) 1274 return -EPERM; 1275 return cifs_sfu_make_node(xid, inode, dentry, tcon, 1276 full_path, mode, dev); 1277 } 1278 1279 static bool 1280 cifs_is_network_name_deleted(char *buf, struct TCP_Server_Info *server) 1281 { 1282 struct smb_hdr *shdr = (struct smb_hdr *)buf; 1283 struct TCP_Server_Info *pserver; 1284 struct cifs_ses *ses; 1285 struct cifs_tcon *tcon; 1286 1287 if (shdr->Flags2 & SMBFLG2_ERR_STATUS) { 1288 if (shdr->Status.CifsError != cpu_to_le32(NT_STATUS_NETWORK_NAME_DELETED)) 1289 return false; 1290 } else { 1291 if (shdr->Status.DosError.ErrorClass != ERRSRV || 1292 shdr->Status.DosError.Error != cpu_to_le16(ERRinvtid)) 1293 return false; 1294 } 1295 1296 /* If server is a channel, select the primary channel */ 1297 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 1298 1299 spin_lock(&cifs_tcp_ses_lock); 1300 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { 1301 if (cifs_ses_exiting(ses)) 1302 continue; 1303 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { 1304 if (tcon->tid == shdr->Tid) { 1305 spin_lock(&tcon->tc_lock); 1306 tcon->need_reconnect = true; 1307 spin_unlock(&tcon->tc_lock); 1308 spin_unlock(&cifs_tcp_ses_lock); 1309 pr_warn_once("Server share %s deleted.\n", 1310 tcon->tree_name); 1311 return true; 1312 } 1313 } 1314 } 1315 spin_unlock(&cifs_tcp_ses_lock); 1316 1317 return false; 1318 } 1319 1320 struct smb_version_operations smb1_operations = { 1321 .send_cancel = send_nt_cancel, 1322 .compare_fids = cifs_compare_fids, 1323 .setup_request = cifs_setup_request, 1324 .setup_async_request = cifs_setup_async_request, 1325 .check_receive = cifs_check_receive, 1326 .add_credits = cifs_add_credits, 1327 .set_credits = cifs_set_credits, 1328 .get_credits_field = cifs_get_credits_field, 1329 .get_credits = cifs_get_credits, 1330 .wait_mtu_credits = cifs_wait_mtu_credits, 1331 .get_next_mid = cifs_get_next_mid, 1332 .read_data_offset = cifs_read_data_offset, 1333 .read_data_length = cifs_read_data_length, 1334 .map_error = map_smb_to_linux_error, 1335 .find_mid = cifs_find_mid, 1336 .check_message = checkSMB, 1337 .dump_detail = cifs_dump_detail, 1338 .clear_stats = cifs_clear_stats, 1339 .print_stats = cifs_print_stats, 1340 .is_oplock_break = is_valid_oplock_break, 1341 .downgrade_oplock = cifs_downgrade_oplock, 1342 .check_trans2 = cifs_check_trans2, 1343 .need_neg = cifs_need_neg, 1344 .negotiate = cifs_negotiate, 1345 .negotiate_wsize = smb1_negotiate_wsize, 1346 .negotiate_rsize = smb1_negotiate_rsize, 1347 .sess_setup = CIFS_SessSetup, 1348 .logoff = CIFSSMBLogoff, 1349 .tree_connect = CIFSTCon, 1350 .tree_disconnect = CIFSSMBTDis, 1351 .get_dfs_refer = CIFSGetDFSRefer, 1352 .qfs_tcon = cifs_qfs_tcon, 1353 .is_path_accessible = cifs_is_path_accessible, 1354 .can_echo = cifs_can_echo, 1355 .query_path_info = cifs_query_path_info, 1356 .query_reparse_point = cifs_query_reparse_point, 1357 .query_file_info = cifs_query_file_info, 1358 .get_srv_inum = cifs_get_srv_inum, 1359 .set_path_size = CIFSSMBSetEOF, 1360 .set_file_size = CIFSSMBSetFileSize, 1361 .set_file_info = smb_set_file_info, 1362 .set_compression = cifs_set_compression, 1363 .echo = CIFSSMBEcho, 1364 .mkdir = CIFSSMBMkDir, 1365 .mkdir_setinfo = cifs_mkdir_setinfo, 1366 .rmdir = CIFSSMBRmDir, 1367 .unlink = CIFSSMBDelFile, 1368 .rename_pending_delete = cifs_rename_pending_delete, 1369 .rename = CIFSSMBRename, 1370 .create_hardlink = CIFSCreateHardLink, 1371 .query_symlink = cifs_query_symlink, 1372 .get_reparse_point_buffer = cifs_get_reparse_point_buffer, 1373 .open = cifs_open_file, 1374 .set_fid = cifs_set_fid, 1375 .close = cifs_close_file, 1376 .flush = cifs_flush_file, 1377 .async_readv = cifs_async_readv, 1378 .async_writev = cifs_async_writev, 1379 .sync_read = cifs_sync_read, 1380 .sync_write = cifs_sync_write, 1381 .query_dir_first = cifs_query_dir_first, 1382 .query_dir_next = cifs_query_dir_next, 1383 .close_dir = cifs_close_dir, 1384 .calc_smb_size = smbCalcSize, 1385 .oplock_response = cifs_oplock_response, 1386 .queryfs = cifs_queryfs, 1387 .mand_lock = cifs_mand_lock, 1388 .mand_unlock_range = cifs_unlock_range, 1389 .push_mand_locks = cifs_push_mandatory_locks, 1390 .query_mf_symlink = cifs_query_mf_symlink, 1391 .create_mf_symlink = cifs_create_mf_symlink, 1392 .is_read_op = cifs_is_read_op, 1393 .wp_retry_size = cifs_wp_retry_size, 1394 .dir_needs_close = cifs_dir_needs_close, 1395 .select_sectype = cifs_select_sectype, 1396 #ifdef CONFIG_CIFS_XATTR 1397 .query_all_EAs = CIFSSMBQAllEAs, 1398 .set_EA = CIFSSMBSetEA, 1399 #endif /* CIFS_XATTR */ 1400 .get_acl = get_cifs_acl, 1401 .get_acl_by_fid = get_cifs_acl_by_fid, 1402 .set_acl = set_cifs_acl, 1403 .make_node = cifs_make_node, 1404 .is_network_name_deleted = cifs_is_network_name_deleted, 1405 }; 1406 1407 struct smb_version_values smb1_values = { 1408 .version_string = SMB1_VERSION_STRING, 1409 .protocol_id = SMB10_PROT_ID, 1410 .large_lock_type = LOCKING_ANDX_LARGE_FILES, 1411 .exclusive_lock_type = 0, 1412 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK, 1413 .unlock_lock_type = 0, 1414 .header_preamble_size = 4, 1415 .header_size = sizeof(struct smb_hdr), 1416 .max_header_size = MAX_CIFS_HDR_SIZE, 1417 .read_rsp_size = sizeof(READ_RSP), 1418 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX), 1419 .cap_unix = CAP_UNIX, 1420 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND, 1421 .cap_large_files = CAP_LARGE_FILES, 1422 .cap_unicode = CAP_UNICODE, 1423 .signing_enabled = SECMODE_SIGN_ENABLED, 1424 .signing_required = SECMODE_SIGN_REQUIRED, 1425 }; 1426