1/* 2 * SMB1 (CIFS) version specific operations 3 * 4 * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com> 5 * 6 * This library is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License v2 as published 8 * by the Free Software Foundation. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU Lesser General Public License for more details. 14 * 15 * You should have received a copy of the GNU Lesser General Public License 16 * along with this library; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20#include <linux/pagemap.h> 21#include <linux/vfs.h> 22#include "cifsglob.h" 23#include "cifsproto.h" 24#include "cifs_debug.h" 25#include "cifspdu.h" 26#include "cifs_unicode.h" 27 28/* 29 * An NT cancel request header looks just like the original request except: 30 * 31 * The Command is SMB_COM_NT_CANCEL 32 * The WordCount is zeroed out 33 * The ByteCount is zeroed out 34 * 35 * This function mangles an existing request buffer into a 36 * SMB_COM_NT_CANCEL request and then sends it. 37 */ 38static int 39send_nt_cancel(struct TCP_Server_Info *server, void *buf, 40 struct mid_q_entry *mid) 41{ 42 int rc = 0; 43 struct smb_hdr *in_buf = (struct smb_hdr *)buf; 44 45 /* -4 for RFC1001 length and +2 for BCC field */ 46 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2); 47 in_buf->Command = SMB_COM_NT_CANCEL; 48 in_buf->WordCount = 0; 49 put_bcc(0, in_buf); 50 51 mutex_lock(&server->srv_mutex); 52 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); 53 if (rc) { 54 mutex_unlock(&server->srv_mutex); 55 return rc; 56 } 57 58 /* 59 * The response to this call was already factored into the sequence 60 * number when the call went out, so we must adjust it back downward 61 * after signing here. 62 */ 63 --server->sequence_number; 64 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); 65 if (rc < 0) 66 server->sequence_number--; 67 68 mutex_unlock(&server->srv_mutex); 69 70 cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n", 71 get_mid(in_buf), rc); 72 73 return rc; 74} 75 76static bool 77cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2) 78{ 79 return ob1->fid.netfid == ob2->fid.netfid; 80} 81 82static unsigned int 83cifs_read_data_offset(char *buf) 84{ 85 READ_RSP *rsp = (READ_RSP *)buf; 86 return le16_to_cpu(rsp->DataOffset); 87} 88 89static unsigned int 90cifs_read_data_length(char *buf) 91{ 92 READ_RSP *rsp = (READ_RSP *)buf; 93 return (le16_to_cpu(rsp->DataLengthHigh) << 16) + 94 le16_to_cpu(rsp->DataLength); 95} 96 97static struct mid_q_entry * 98cifs_find_mid(struct TCP_Server_Info *server, char *buffer) 99{ 100 struct smb_hdr *buf = (struct smb_hdr *)buffer; 101 struct mid_q_entry *mid; 102 103 spin_lock(&GlobalMid_Lock); 104 list_for_each_entry(mid, &server->pending_mid_q, qhead) { 105 if (compare_mid(mid->mid, buf) && 106 mid->mid_state == MID_REQUEST_SUBMITTED && 107 le16_to_cpu(mid->command) == buf->Command) { 108 spin_unlock(&GlobalMid_Lock); 109 return mid; 110 } 111 } 112 spin_unlock(&GlobalMid_Lock); 113 return NULL; 114} 115 116static void 117cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add, 118 const int optype) 119{ 120 spin_lock(&server->req_lock); 121 server->credits += add; 122 server->in_flight--; 123 spin_unlock(&server->req_lock); 124 wake_up(&server->request_q); 125} 126 127static void 128cifs_set_credits(struct TCP_Server_Info *server, const int val) 129{ 130 spin_lock(&server->req_lock); 131 server->credits = val; 132 server->oplocks = val > 1 ? enable_oplocks : false; 133 spin_unlock(&server->req_lock); 134} 135 136static int * 137cifs_get_credits_field(struct TCP_Server_Info *server, const int optype) 138{ 139 return &server->credits; 140} 141 142static unsigned int 143cifs_get_credits(struct mid_q_entry *mid) 144{ 145 return 1; 146} 147 148/* 149 * Find a free multiplex id (SMB mid). Otherwise there could be 150 * mid collisions which might cause problems, demultiplexing the 151 * wrong response to this request. Multiplex ids could collide if 152 * one of a series requests takes much longer than the others, or 153 * if a very large number of long lived requests (byte range 154 * locks or FindNotify requests) are pending. No more than 155 * 64K-1 requests can be outstanding at one time. If no 156 * mids are available, return zero. A future optimization 157 * could make the combination of mids and uid the key we use 158 * to demultiplex on (rather than mid alone). 159 * In addition to the above check, the cifs demultiplex 160 * code already used the command code as a secondary 161 * check of the frame and if signing is negotiated the 162 * response would be discarded if the mid were the same 163 * but the signature was wrong. Since the mid is not put in the 164 * pending queue until later (when it is about to be dispatched) 165 * we do have to limit the number of outstanding requests 166 * to somewhat less than 64K-1 although it is hard to imagine 167 * so many threads being in the vfs at one time. 168 */ 169static __u64 170cifs_get_next_mid(struct TCP_Server_Info *server) 171{ 172 __u64 mid = 0; 173 __u16 last_mid, cur_mid; 174 bool collision; 175 176 spin_lock(&GlobalMid_Lock); 177 178 /* mid is 16 bit only for CIFS/SMB */ 179 cur_mid = (__u16)((server->CurrentMid) & 0xffff); 180 /* we do not want to loop forever */ 181 last_mid = cur_mid; 182 cur_mid++; 183 184 /* 185 * This nested loop looks more expensive than it is. 186 * In practice the list of pending requests is short, 187 * fewer than 50, and the mids are likely to be unique 188 * on the first pass through the loop unless some request 189 * takes longer than the 64 thousand requests before it 190 * (and it would also have to have been a request that 191 * did not time out). 192 */ 193 while (cur_mid != last_mid) { 194 struct mid_q_entry *mid_entry; 195 unsigned int num_mids; 196 197 collision = false; 198 if (cur_mid == 0) 199 cur_mid++; 200 201 num_mids = 0; 202 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) { 203 ++num_mids; 204 if (mid_entry->mid == cur_mid && 205 mid_entry->mid_state == MID_REQUEST_SUBMITTED) { 206 /* This mid is in use, try a different one */ 207 collision = true; 208 break; 209 } 210 } 211 212 /* 213 * if we have more than 32k mids in the list, then something 214 * is very wrong. Possibly a local user is trying to DoS the 215 * box by issuing long-running calls and SIGKILL'ing them. If 216 * we get to 2^16 mids then we're in big trouble as this 217 * function could loop forever. 218 * 219 * Go ahead and assign out the mid in this situation, but force 220 * an eventual reconnect to clean out the pending_mid_q. 221 */ 222 if (num_mids > 32768) 223 server->tcpStatus = CifsNeedReconnect; 224 225 if (!collision) { 226 mid = (__u64)cur_mid; 227 server->CurrentMid = mid; 228 break; 229 } 230 cur_mid++; 231 } 232 spin_unlock(&GlobalMid_Lock); 233 return mid; 234} 235 236/* 237 return codes: 238 0 not a transact2, or all data present 239 >0 transact2 with that much data missing 240 -EINVAL invalid transact2 241 */ 242static int 243check2ndT2(char *buf) 244{ 245 struct smb_hdr *pSMB = (struct smb_hdr *)buf; 246 struct smb_t2_rsp *pSMBt; 247 int remaining; 248 __u16 total_data_size, data_in_this_rsp; 249 250 if (pSMB->Command != SMB_COM_TRANSACTION2) 251 return 0; 252 253 /* check for plausible wct, bcc and t2 data and parm sizes */ 254 /* check for parm and data offset going beyond end of smb */ 255 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */ 256 cifs_dbg(FYI, "invalid transact2 word count\n"); 257 return -EINVAL; 258 } 259 260 pSMBt = (struct smb_t2_rsp *)pSMB; 261 262 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount); 263 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount); 264 265 if (total_data_size == data_in_this_rsp) 266 return 0; 267 else if (total_data_size < data_in_this_rsp) { 268 cifs_dbg(FYI, "total data %d smaller than data in frame %d\n", 269 total_data_size, data_in_this_rsp); 270 return -EINVAL; 271 } 272 273 remaining = total_data_size - data_in_this_rsp; 274 275 cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n", 276 remaining); 277 if (total_data_size > CIFSMaxBufSize) { 278 cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n", 279 total_data_size, CIFSMaxBufSize); 280 return -EINVAL; 281 } 282 return remaining; 283} 284 285static int 286coalesce_t2(char *second_buf, struct smb_hdr *target_hdr) 287{ 288 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf; 289 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr; 290 char *data_area_of_tgt; 291 char *data_area_of_src; 292 int remaining; 293 unsigned int byte_count, total_in_tgt; 294 __u16 tgt_total_cnt, src_total_cnt, total_in_src; 295 296 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount); 297 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount); 298 299 if (tgt_total_cnt != src_total_cnt) 300 cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n", 301 src_total_cnt, tgt_total_cnt); 302 303 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount); 304 305 remaining = tgt_total_cnt - total_in_tgt; 306 307 if (remaining < 0) { 308 cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%hu\n", 309 tgt_total_cnt, total_in_tgt); 310 return -EPROTO; 311 } 312 313 if (remaining == 0) { 314 /* nothing to do, ignore */ 315 cifs_dbg(FYI, "no more data remains\n"); 316 return 0; 317 } 318 319 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount); 320 if (remaining < total_in_src) 321 cifs_dbg(FYI, "transact2 2nd response contains too much data\n"); 322 323 /* find end of first SMB data area */ 324 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol + 325 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset); 326 327 /* validate target area */ 328 data_area_of_src = (char *)&pSMBs->hdr.Protocol + 329 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset); 330 331 data_area_of_tgt += total_in_tgt; 332 333 total_in_tgt += total_in_src; 334 /* is the result too big for the field? */ 335 if (total_in_tgt > USHRT_MAX) { 336 cifs_dbg(FYI, "coalesced DataCount too large (%u)\n", 337 total_in_tgt); 338 return -EPROTO; 339 } 340 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount); 341 342 /* fix up the BCC */ 343 byte_count = get_bcc(target_hdr); 344 byte_count += total_in_src; 345 /* is the result too big for the field? */ 346 if (byte_count > USHRT_MAX) { 347 cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count); 348 return -EPROTO; 349 } 350 put_bcc(byte_count, target_hdr); 351 352 byte_count = be32_to_cpu(target_hdr->smb_buf_length); 353 byte_count += total_in_src; 354 /* don't allow buffer to overflow */ 355 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { 356 cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n", 357 byte_count); 358 return -ENOBUFS; 359 } 360 target_hdr->smb_buf_length = cpu_to_be32(byte_count); 361 362 /* copy second buffer into end of first buffer */ 363 memcpy(data_area_of_tgt, data_area_of_src, total_in_src); 364 365 if (remaining != total_in_src) { 366 /* more responses to go */ 367 cifs_dbg(FYI, "waiting for more secondary responses\n"); 368 return 1; 369 } 370 371 /* we are done */ 372 cifs_dbg(FYI, "found the last secondary response\n"); 373 return 0; 374} 375 376static void 377cifs_downgrade_oplock(struct TCP_Server_Info *server, 378 struct cifsInodeInfo *cinode, bool set_level2) 379{ 380 if (set_level2) 381 cifs_set_oplock_level(cinode, OPLOCK_READ); 382 else 383 cifs_set_oplock_level(cinode, 0); 384} 385 386static bool 387cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server, 388 char *buf, int malformed) 389{ 390 if (malformed) 391 return false; 392 if (check2ndT2(buf) <= 0) 393 return false; 394 mid->multiRsp = true; 395 if (mid->resp_buf) { 396 /* merge response - fix up 1st*/ 397 malformed = coalesce_t2(buf, mid->resp_buf); 398 if (malformed > 0) 399 return true; 400 /* All parts received or packet is malformed. */ 401 mid->multiEnd = true; 402 dequeue_mid(mid, malformed); 403 return true; 404 } 405 if (!server->large_buf) { 406 /*FIXME: switch to already allocated largebuf?*/ 407 cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n"); 408 } else { 409 /* Have first buffer */ 410 mid->resp_buf = buf; 411 mid->large_buf = true; 412 server->bigbuf = NULL; 413 } 414 return true; 415} 416 417static bool 418cifs_need_neg(struct TCP_Server_Info *server) 419{ 420 return server->maxBuf == 0; 421} 422 423static int 424cifs_negotiate(const unsigned int xid, struct cifs_ses *ses) 425{ 426 int rc; 427 rc = CIFSSMBNegotiate(xid, ses); 428 if (rc == -EAGAIN) { 429 /* retry only once on 1st time connection */ 430 set_credits(ses->server, 1); 431 rc = CIFSSMBNegotiate(xid, ses); 432 if (rc == -EAGAIN) 433 rc = -EHOSTDOWN; 434 } 435 return rc; 436} 437 438static unsigned int 439cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info) 440{ 441 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); 442 struct TCP_Server_Info *server = tcon->ses->server; 443 unsigned int wsize; 444 445 /* start with specified wsize, or default */ 446 if (volume_info->wsize) 447 wsize = volume_info->wsize; 448 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) 449 wsize = CIFS_DEFAULT_IOSIZE; 450 else 451 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE; 452 453 /* can server support 24-bit write sizes? (via UNIX extensions) */ 454 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) 455 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE); 456 457 /* 458 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set? 459 * Limit it to max buffer offered by the server, minus the size of the 460 * WRITEX header, not including the 4 byte RFC1001 length. 461 */ 462 if (!(server->capabilities & CAP_LARGE_WRITE_X) || 463 (!(server->capabilities & CAP_UNIX) && server->sign)) 464 wsize = min_t(unsigned int, wsize, 465 server->maxBuf - sizeof(WRITE_REQ) + 4); 466 467 /* hard limit of CIFS_MAX_WSIZE */ 468 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE); 469 470 return wsize; 471} 472 473static unsigned int 474cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info) 475{ 476 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); 477 struct TCP_Server_Info *server = tcon->ses->server; 478 unsigned int rsize, defsize; 479 480 /* 481 * Set default value... 482 * 483 * HACK alert! Ancient servers have very small buffers. Even though 484 * MS-CIFS indicates that servers are only limited by the client's 485 * bufsize for reads, testing against win98se shows that it throws 486 * INVALID_PARAMETER errors if you try to request too large a read. 487 * OS/2 just sends back short reads. 488 * 489 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that 490 * it can't handle a read request larger than its MaxBufferSize either. 491 */ 492 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP)) 493 defsize = CIFS_DEFAULT_IOSIZE; 494 else if (server->capabilities & CAP_LARGE_READ_X) 495 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE; 496 else 497 defsize = server->maxBuf - sizeof(READ_RSP); 498 499 rsize = volume_info->rsize ? volume_info->rsize : defsize; 500 501 /* 502 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to 503 * the client's MaxBufferSize. 504 */ 505 if (!(server->capabilities & CAP_LARGE_READ_X)) 506 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize); 507 508 /* hard limit of CIFS_MAX_RSIZE */ 509 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE); 510 511 return rsize; 512} 513 514static void 515cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon) 516{ 517 CIFSSMBQFSDeviceInfo(xid, tcon); 518 CIFSSMBQFSAttributeInfo(xid, tcon); 519} 520 521static int 522cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon, 523 struct cifs_sb_info *cifs_sb, const char *full_path) 524{ 525 int rc; 526 FILE_ALL_INFO *file_info; 527 528 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); 529 if (file_info == NULL) 530 return -ENOMEM; 531 532 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info, 533 0 /* not legacy */, cifs_sb->local_nls, 534 cifs_remap(cifs_sb)); 535 536 if (rc == -EOPNOTSUPP || rc == -EINVAL) 537 rc = SMBQueryInformation(xid, tcon, full_path, file_info, 538 cifs_sb->local_nls, cifs_remap(cifs_sb)); 539 kfree(file_info); 540 return rc; 541} 542 543static int 544cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon, 545 struct cifs_sb_info *cifs_sb, const char *full_path, 546 FILE_ALL_INFO *data, bool *adjustTZ, bool *symlink) 547{ 548 int rc; 549 550 *symlink = false; 551 552 /* could do find first instead but this returns more info */ 553 rc = CIFSSMBQPathInfo(xid, tcon, full_path, data, 0 /* not legacy */, 554 cifs_sb->local_nls, cifs_remap(cifs_sb)); 555 /* 556 * BB optimize code so we do not make the above call when server claims 557 * no NT SMB support and the above call failed at least once - set flag 558 * in tcon or mount. 559 */ 560 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) { 561 rc = SMBQueryInformation(xid, tcon, full_path, data, 562 cifs_sb->local_nls, 563 cifs_remap(cifs_sb)); 564 *adjustTZ = true; 565 } 566 567 if (!rc && (le32_to_cpu(data->Attributes) & ATTR_REPARSE)) { 568 int tmprc; 569 int oplock = 0; 570 struct cifs_fid fid; 571 struct cifs_open_parms oparms; 572 573 oparms.tcon = tcon; 574 oparms.cifs_sb = cifs_sb; 575 oparms.desired_access = FILE_READ_ATTRIBUTES; 576 oparms.create_options = 0; 577 oparms.disposition = FILE_OPEN; 578 oparms.path = full_path; 579 oparms.fid = &fid; 580 oparms.reconnect = false; 581 582 /* Need to check if this is a symbolic link or not */ 583 tmprc = CIFS_open(xid, &oparms, &oplock, NULL); 584 if (tmprc == -EOPNOTSUPP) 585 *symlink = true; 586 else if (tmprc == 0) 587 CIFSSMBClose(xid, tcon, fid.netfid); 588 } 589 590 return rc; 591} 592 593static int 594cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon, 595 struct cifs_sb_info *cifs_sb, const char *full_path, 596 u64 *uniqueid, FILE_ALL_INFO *data) 597{ 598 /* 599 * We can not use the IndexNumber field by default from Windows or 600 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA 601 * CIFS spec claims that this value is unique within the scope of a 602 * share, and the windows docs hint that it's actually unique 603 * per-machine. 604 * 605 * There may be higher info levels that work but are there Windows 606 * server or network appliances for which IndexNumber field is not 607 * guaranteed unique? 608 */ 609 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid, 610 cifs_sb->local_nls, 611 cifs_remap(cifs_sb)); 612} 613 614static int 615cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon, 616 struct cifs_fid *fid, FILE_ALL_INFO *data) 617{ 618 return CIFSSMBQFileInfo(xid, tcon, fid->netfid, data); 619} 620 621static void 622cifs_clear_stats(struct cifs_tcon *tcon) 623{ 624#ifdef CONFIG_CIFS_STATS 625 atomic_set(&tcon->stats.cifs_stats.num_writes, 0); 626 atomic_set(&tcon->stats.cifs_stats.num_reads, 0); 627 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0); 628 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0); 629 atomic_set(&tcon->stats.cifs_stats.num_opens, 0); 630 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0); 631 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0); 632 atomic_set(&tcon->stats.cifs_stats.num_closes, 0); 633 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0); 634 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0); 635 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0); 636 atomic_set(&tcon->stats.cifs_stats.num_renames, 0); 637 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0); 638 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0); 639 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0); 640 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0); 641 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0); 642 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0); 643 atomic_set(&tcon->stats.cifs_stats.num_locks, 0); 644 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0); 645 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0); 646#endif 647} 648 649static void 650cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon) 651{ 652#ifdef CONFIG_CIFS_STATS 653 seq_printf(m, " Oplocks breaks: %d", 654 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks)); 655 seq_printf(m, "\nReads: %d Bytes: %llu", 656 atomic_read(&tcon->stats.cifs_stats.num_reads), 657 (long long)(tcon->bytes_read)); 658 seq_printf(m, "\nWrites: %d Bytes: %llu", 659 atomic_read(&tcon->stats.cifs_stats.num_writes), 660 (long long)(tcon->bytes_written)); 661 seq_printf(m, "\nFlushes: %d", 662 atomic_read(&tcon->stats.cifs_stats.num_flushes)); 663 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d", 664 atomic_read(&tcon->stats.cifs_stats.num_locks), 665 atomic_read(&tcon->stats.cifs_stats.num_hardlinks), 666 atomic_read(&tcon->stats.cifs_stats.num_symlinks)); 667 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d", 668 atomic_read(&tcon->stats.cifs_stats.num_opens), 669 atomic_read(&tcon->stats.cifs_stats.num_closes), 670 atomic_read(&tcon->stats.cifs_stats.num_deletes)); 671 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d", 672 atomic_read(&tcon->stats.cifs_stats.num_posixopens), 673 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs)); 674 seq_printf(m, "\nMkdirs: %d Rmdirs: %d", 675 atomic_read(&tcon->stats.cifs_stats.num_mkdirs), 676 atomic_read(&tcon->stats.cifs_stats.num_rmdirs)); 677 seq_printf(m, "\nRenames: %d T2 Renames %d", 678 atomic_read(&tcon->stats.cifs_stats.num_renames), 679 atomic_read(&tcon->stats.cifs_stats.num_t2renames)); 680 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d", 681 atomic_read(&tcon->stats.cifs_stats.num_ffirst), 682 atomic_read(&tcon->stats.cifs_stats.num_fnext), 683 atomic_read(&tcon->stats.cifs_stats.num_fclose)); 684#endif 685} 686 687static void 688cifs_mkdir_setinfo(struct inode *inode, const char *full_path, 689 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon, 690 const unsigned int xid) 691{ 692 FILE_BASIC_INFO info; 693 struct cifsInodeInfo *cifsInode; 694 u32 dosattrs; 695 int rc; 696 697 memset(&info, 0, sizeof(info)); 698 cifsInode = CIFS_I(inode); 699 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY; 700 info.Attributes = cpu_to_le32(dosattrs); 701 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls, 702 cifs_remap(cifs_sb)); 703 if (rc == 0) 704 cifsInode->cifsAttrs = dosattrs; 705} 706 707static int 708cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms, 709 __u32 *oplock, FILE_ALL_INFO *buf) 710{ 711 if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS)) 712 return SMBLegacyOpen(xid, oparms->tcon, oparms->path, 713 oparms->disposition, 714 oparms->desired_access, 715 oparms->create_options, 716 &oparms->fid->netfid, oplock, buf, 717 oparms->cifs_sb->local_nls, 718 cifs_remap(oparms->cifs_sb)); 719 return CIFS_open(xid, oparms, oplock, buf); 720} 721 722static void 723cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock) 724{ 725 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); 726 cfile->fid.netfid = fid->netfid; 727 cifs_set_oplock_level(cinode, oplock); 728 cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode); 729} 730 731static void 732cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon, 733 struct cifs_fid *fid) 734{ 735 CIFSSMBClose(xid, tcon, fid->netfid); 736} 737 738static int 739cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon, 740 struct cifs_fid *fid) 741{ 742 return CIFSSMBFlush(xid, tcon, fid->netfid); 743} 744 745static int 746cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid, 747 struct cifs_io_parms *parms, unsigned int *bytes_read, 748 char **buf, int *buf_type) 749{ 750 parms->netfid = pfid->netfid; 751 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type); 752} 753 754static int 755cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid, 756 struct cifs_io_parms *parms, unsigned int *written, 757 struct kvec *iov, unsigned long nr_segs) 758{ 759 760 parms->netfid = pfid->netfid; 761 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs); 762} 763 764static int 765smb_set_file_info(struct inode *inode, const char *full_path, 766 FILE_BASIC_INFO *buf, const unsigned int xid) 767{ 768 int oplock = 0; 769 int rc; 770 __u32 netpid; 771 struct cifs_fid fid; 772 struct cifs_open_parms oparms; 773 struct cifsFileInfo *open_file; 774 struct cifsInodeInfo *cinode = CIFS_I(inode); 775 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); 776 struct tcon_link *tlink = NULL; 777 struct cifs_tcon *tcon; 778 779 /* if the file is already open for write, just use that fileid */ 780 open_file = find_writable_file(cinode, true); 781 if (open_file) { 782 fid.netfid = open_file->fid.netfid; 783 netpid = open_file->pid; 784 tcon = tlink_tcon(open_file->tlink); 785 goto set_via_filehandle; 786 } 787 788 tlink = cifs_sb_tlink(cifs_sb); 789 if (IS_ERR(tlink)) { 790 rc = PTR_ERR(tlink); 791 tlink = NULL; 792 goto out; 793 } 794 tcon = tlink_tcon(tlink); 795 796 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls, 797 cifs_remap(cifs_sb)); 798 if (rc == 0) { 799 cinode->cifsAttrs = le32_to_cpu(buf->Attributes); 800 goto out; 801 } else if (rc != -EOPNOTSUPP && rc != -EINVAL) { 802 goto out; 803 } 804 805 oparms.tcon = tcon; 806 oparms.cifs_sb = cifs_sb; 807 oparms.desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES; 808 oparms.create_options = CREATE_NOT_DIR; 809 oparms.disposition = FILE_OPEN; 810 oparms.path = full_path; 811 oparms.fid = &fid; 812 oparms.reconnect = false; 813 814 cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n"); 815 rc = CIFS_open(xid, &oparms, &oplock, NULL); 816 if (rc != 0) { 817 if (rc == -EIO) 818 rc = -EINVAL; 819 goto out; 820 } 821 822 netpid = current->tgid; 823 824set_via_filehandle: 825 rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid); 826 if (!rc) 827 cinode->cifsAttrs = le32_to_cpu(buf->Attributes); 828 829 if (open_file == NULL) 830 CIFSSMBClose(xid, tcon, fid.netfid); 831 else 832 cifsFileInfo_put(open_file); 833out: 834 if (tlink != NULL) 835 cifs_put_tlink(tlink); 836 return rc; 837} 838 839static int 840cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon, 841 struct cifsFileInfo *cfile) 842{ 843 return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid); 844} 845 846static int 847cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon, 848 const char *path, struct cifs_sb_info *cifs_sb, 849 struct cifs_fid *fid, __u16 search_flags, 850 struct cifs_search_info *srch_inf) 851{ 852 return CIFSFindFirst(xid, tcon, path, cifs_sb, 853 &fid->netfid, search_flags, srch_inf, true); 854} 855 856static int 857cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon, 858 struct cifs_fid *fid, __u16 search_flags, 859 struct cifs_search_info *srch_inf) 860{ 861 return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf); 862} 863 864static int 865cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon, 866 struct cifs_fid *fid) 867{ 868 return CIFSFindClose(xid, tcon, fid->netfid); 869} 870 871static int 872cifs_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid, 873 struct cifsInodeInfo *cinode) 874{ 875 return CIFSSMBLock(0, tcon, fid->netfid, current->tgid, 0, 0, 0, 0, 876 LOCKING_ANDX_OPLOCK_RELEASE, false, 877 CIFS_CACHE_READ(cinode) ? 1 : 0); 878} 879 880static int 881cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon, 882 struct kstatfs *buf) 883{ 884 int rc = -EOPNOTSUPP; 885 886 buf->f_type = CIFS_MAGIC_NUMBER; 887 888 /* 889 * We could add a second check for a QFS Unix capability bit 890 */ 891 if ((tcon->ses->capabilities & CAP_UNIX) && 892 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability))) 893 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf); 894 895 /* 896 * Only need to call the old QFSInfo if failed on newer one, 897 * e.g. by OS/2. 898 **/ 899 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS)) 900 rc = CIFSSMBQFSInfo(xid, tcon, buf); 901 902 /* 903 * Some old Windows servers also do not support level 103, retry with 904 * older level one if old server failed the previous call or we 905 * bypassed it because we detected that this was an older LANMAN sess 906 */ 907 if (rc) 908 rc = SMBOldQFSInfo(xid, tcon, buf); 909 return rc; 910} 911 912static int 913cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset, 914 __u64 length, __u32 type, int lock, int unlock, bool wait) 915{ 916 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid, 917 current->tgid, length, offset, unlock, lock, 918 (__u8)type, wait, 0); 919} 920 921static int 922cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon, 923 const unsigned char *searchName, char **symlinkinfo, 924 const struct nls_table *nls_codepage) 925{ 926#ifdef CONFIG_CIFS_DFS_UPCALL 927 int rc; 928 unsigned int num_referrals = 0; 929 struct dfs_info3_param *referrals = NULL; 930 931 rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage, 932 &num_referrals, &referrals, 0); 933 934 if (!rc && num_referrals > 0) { 935 *symlinkinfo = kstrndup(referrals->node_name, 936 strlen(referrals->node_name), 937 GFP_KERNEL); 938 if (!*symlinkinfo) 939 rc = -ENOMEM; 940 free_dfs_info_array(referrals, num_referrals); 941 } 942 return rc; 943#else /* No DFS support */ 944 return -EREMOTE; 945#endif 946} 947 948static int 949cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, 950 const char *full_path, char **target_path, 951 struct cifs_sb_info *cifs_sb) 952{ 953 int rc; 954 int oplock = 0; 955 struct cifs_fid fid; 956 struct cifs_open_parms oparms; 957 958 cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path); 959 960 /* Check for unix extensions */ 961 if (cap_unix(tcon->ses)) { 962 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path, 963 cifs_sb->local_nls, 964 cifs_remap(cifs_sb)); 965 if (rc == -EREMOTE) 966 rc = cifs_unix_dfs_readlink(xid, tcon, full_path, 967 target_path, 968 cifs_sb->local_nls); 969 970 goto out; 971 } 972 973 oparms.tcon = tcon; 974 oparms.cifs_sb = cifs_sb; 975 oparms.desired_access = FILE_READ_ATTRIBUTES; 976 oparms.create_options = OPEN_REPARSE_POINT; 977 oparms.disposition = FILE_OPEN; 978 oparms.path = full_path; 979 oparms.fid = &fid; 980 oparms.reconnect = false; 981 982 rc = CIFS_open(xid, &oparms, &oplock, NULL); 983 if (rc) 984 goto out; 985 986 rc = CIFSSMBQuerySymLink(xid, tcon, fid.netfid, target_path, 987 cifs_sb->local_nls); 988 if (rc) 989 goto out_close; 990 991 convert_delimiter(*target_path, '/'); 992out_close: 993 CIFSSMBClose(xid, tcon, fid.netfid); 994out: 995 if (!rc) 996 cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path); 997 return rc; 998} 999 1000static bool 1001cifs_is_read_op(__u32 oplock) 1002{ 1003 return oplock == OPLOCK_READ; 1004} 1005 1006static unsigned int 1007cifs_wp_retry_size(struct inode *inode) 1008{ 1009 return CIFS_SB(inode->i_sb)->wsize; 1010} 1011 1012static bool 1013cifs_dir_needs_close(struct cifsFileInfo *cfile) 1014{ 1015 return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle; 1016} 1017 1018struct smb_version_operations smb1_operations = { 1019 .send_cancel = send_nt_cancel, 1020 .compare_fids = cifs_compare_fids, 1021 .setup_request = cifs_setup_request, 1022 .setup_async_request = cifs_setup_async_request, 1023 .check_receive = cifs_check_receive, 1024 .add_credits = cifs_add_credits, 1025 .set_credits = cifs_set_credits, 1026 .get_credits_field = cifs_get_credits_field, 1027 .get_credits = cifs_get_credits, 1028 .wait_mtu_credits = cifs_wait_mtu_credits, 1029 .get_next_mid = cifs_get_next_mid, 1030 .read_data_offset = cifs_read_data_offset, 1031 .read_data_length = cifs_read_data_length, 1032 .map_error = map_smb_to_linux_error, 1033 .find_mid = cifs_find_mid, 1034 .check_message = checkSMB, 1035 .dump_detail = cifs_dump_detail, 1036 .clear_stats = cifs_clear_stats, 1037 .print_stats = cifs_print_stats, 1038 .is_oplock_break = is_valid_oplock_break, 1039 .downgrade_oplock = cifs_downgrade_oplock, 1040 .check_trans2 = cifs_check_trans2, 1041 .need_neg = cifs_need_neg, 1042 .negotiate = cifs_negotiate, 1043 .negotiate_wsize = cifs_negotiate_wsize, 1044 .negotiate_rsize = cifs_negotiate_rsize, 1045 .sess_setup = CIFS_SessSetup, 1046 .logoff = CIFSSMBLogoff, 1047 .tree_connect = CIFSTCon, 1048 .tree_disconnect = CIFSSMBTDis, 1049 .get_dfs_refer = CIFSGetDFSRefer, 1050 .qfs_tcon = cifs_qfs_tcon, 1051 .is_path_accessible = cifs_is_path_accessible, 1052 .query_path_info = cifs_query_path_info, 1053 .query_file_info = cifs_query_file_info, 1054 .get_srv_inum = cifs_get_srv_inum, 1055 .set_path_size = CIFSSMBSetEOF, 1056 .set_file_size = CIFSSMBSetFileSize, 1057 .set_file_info = smb_set_file_info, 1058 .set_compression = cifs_set_compression, 1059 .echo = CIFSSMBEcho, 1060 .mkdir = CIFSSMBMkDir, 1061 .mkdir_setinfo = cifs_mkdir_setinfo, 1062 .rmdir = CIFSSMBRmDir, 1063 .unlink = CIFSSMBDelFile, 1064 .rename_pending_delete = cifs_rename_pending_delete, 1065 .rename = CIFSSMBRename, 1066 .create_hardlink = CIFSCreateHardLink, 1067 .query_symlink = cifs_query_symlink, 1068 .open = cifs_open_file, 1069 .set_fid = cifs_set_fid, 1070 .close = cifs_close_file, 1071 .flush = cifs_flush_file, 1072 .async_readv = cifs_async_readv, 1073 .async_writev = cifs_async_writev, 1074 .sync_read = cifs_sync_read, 1075 .sync_write = cifs_sync_write, 1076 .query_dir_first = cifs_query_dir_first, 1077 .query_dir_next = cifs_query_dir_next, 1078 .close_dir = cifs_close_dir, 1079 .calc_smb_size = smbCalcSize, 1080 .oplock_response = cifs_oplock_response, 1081 .queryfs = cifs_queryfs, 1082 .mand_lock = cifs_mand_lock, 1083 .mand_unlock_range = cifs_unlock_range, 1084 .push_mand_locks = cifs_push_mandatory_locks, 1085 .query_mf_symlink = cifs_query_mf_symlink, 1086 .create_mf_symlink = cifs_create_mf_symlink, 1087 .is_read_op = cifs_is_read_op, 1088 .wp_retry_size = cifs_wp_retry_size, 1089 .dir_needs_close = cifs_dir_needs_close, 1090#ifdef CONFIG_CIFS_XATTR 1091 .query_all_EAs = CIFSSMBQAllEAs, 1092 .set_EA = CIFSSMBSetEA, 1093#endif /* CIFS_XATTR */ 1094#ifdef CONFIG_CIFS_ACL 1095 .get_acl = get_cifs_acl, 1096 .get_acl_by_fid = get_cifs_acl_by_fid, 1097 .set_acl = set_cifs_acl, 1098#endif /* CIFS_ACL */ 1099}; 1100 1101struct smb_version_values smb1_values = { 1102 .version_string = SMB1_VERSION_STRING, 1103 .large_lock_type = LOCKING_ANDX_LARGE_FILES, 1104 .exclusive_lock_type = 0, 1105 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK, 1106 .unlock_lock_type = 0, 1107 .header_size = sizeof(struct smb_hdr), 1108 .max_header_size = MAX_CIFS_HDR_SIZE, 1109 .read_rsp_size = sizeof(READ_RSP), 1110 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX), 1111 .cap_unix = CAP_UNIX, 1112 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND, 1113 .cap_large_files = CAP_LARGE_FILES, 1114 .signing_enabled = SECMODE_SIGN_ENABLED, 1115 .signing_required = SECMODE_SIGN_REQUIRED, 1116}; 1117