1 // SPDX-License-Identifier: LGPL-2.1 2 /* 3 * 4 * Copyright (C) International Business Machines Corp., 2009, 2013 5 * Etersoft, 2012 6 * Author(s): Steve French (sfrench@us.ibm.com) 7 * Pavel Shilovsky (pshilovsky@samba.org) 2012 8 * 9 * Contains the routines for constructing the SMB2 PDUs themselves 10 * 11 */ 12 13 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */ 14 /* Note that there are handle based routines which must be */ 15 /* treated slightly differently for reconnection purposes since we never */ 16 /* want to reuse a stale file handle and only the caller knows the file info */ 17 18 #include <linux/fs.h> 19 #include <linux/kernel.h> 20 #include <linux/vfs.h> 21 #include <linux/task_io_accounting_ops.h> 22 #include <linux/uaccess.h> 23 #include <linux/uuid.h> 24 #include <linux/pagemap.h> 25 #include <linux/xattr.h> 26 #include "cifsglob.h" 27 #include "cifsacl.h" 28 #include "cifsproto.h" 29 #include "smb2proto.h" 30 #include "cifs_unicode.h" 31 #include "cifs_debug.h" 32 #include "ntlmssp.h" 33 #include "smb2status.h" 34 #include "smb2glob.h" 35 #include "cifspdu.h" 36 #include "cifs_spnego.h" 37 #include "smbdirect.h" 38 #include "trace.h" 39 #ifdef CONFIG_CIFS_DFS_UPCALL 40 #include "dfs_cache.h" 41 #endif 42 #include "cached_dir.h" 43 44 /* 45 * The following table defines the expected "StructureSize" of SMB2 requests 46 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests. 47 * 48 * Note that commands are defined in smb2pdu.h in le16 but the array below is 49 * indexed by command in host byte order. 50 */ 51 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { 52 /* SMB2_NEGOTIATE */ 36, 53 /* SMB2_SESSION_SETUP */ 25, 54 /* SMB2_LOGOFF */ 4, 55 /* SMB2_TREE_CONNECT */ 9, 56 /* SMB2_TREE_DISCONNECT */ 4, 57 /* SMB2_CREATE */ 57, 58 /* SMB2_CLOSE */ 24, 59 /* SMB2_FLUSH */ 24, 60 /* SMB2_READ */ 49, 61 /* SMB2_WRITE */ 49, 62 /* SMB2_LOCK */ 48, 63 /* SMB2_IOCTL */ 57, 64 /* SMB2_CANCEL */ 4, 65 /* SMB2_ECHO */ 4, 66 /* SMB2_QUERY_DIRECTORY */ 33, 67 /* SMB2_CHANGE_NOTIFY */ 32, 68 /* SMB2_QUERY_INFO */ 41, 69 /* SMB2_SET_INFO */ 33, 70 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */ 71 }; 72 73 int smb3_encryption_required(const struct cifs_tcon *tcon) 74 { 75 if (!tcon || !tcon->ses) 76 return 0; 77 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) || 78 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)) 79 return 1; 80 if (tcon->seal && 81 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 82 return 1; 83 return 0; 84 } 85 86 static void 87 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd, 88 const struct cifs_tcon *tcon, 89 struct TCP_Server_Info *server) 90 { 91 struct smb3_hdr_req *smb3_hdr; 92 93 shdr->ProtocolId = SMB2_PROTO_NUMBER; 94 shdr->StructureSize = cpu_to_le16(64); 95 shdr->Command = smb2_cmd; 96 97 if (server) { 98 /* After reconnect SMB3 must set ChannelSequence on subsequent reqs */ 99 if (server->dialect >= SMB30_PROT_ID) { 100 smb3_hdr = (struct smb3_hdr_req *)shdr; 101 /* 102 * if primary channel is not set yet, use default 103 * channel for chan sequence num 104 */ 105 if (SERVER_IS_CHAN(server)) 106 smb3_hdr->ChannelSequence = 107 cpu_to_le16(server->primary_server->channel_sequence_num); 108 else 109 smb3_hdr->ChannelSequence = 110 cpu_to_le16(server->channel_sequence_num); 111 } 112 spin_lock(&server->req_lock); 113 /* Request up to 10 credits but don't go over the limit. */ 114 if (server->credits >= server->max_credits) 115 shdr->CreditRequest = cpu_to_le16(0); 116 else 117 shdr->CreditRequest = cpu_to_le16( 118 min_t(int, server->max_credits - 119 server->credits, 10)); 120 spin_unlock(&server->req_lock); 121 } else { 122 shdr->CreditRequest = cpu_to_le16(2); 123 } 124 shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid); 125 126 if (!tcon) 127 goto out; 128 129 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */ 130 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */ 131 if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU)) 132 shdr->CreditCharge = cpu_to_le16(1); 133 /* else CreditCharge MBZ */ 134 135 shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid); 136 /* Uid is not converted */ 137 if (tcon->ses) 138 shdr->SessionId = cpu_to_le64(tcon->ses->Suid); 139 140 /* 141 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have 142 * to pass the path on the Open SMB prefixed by \\server\share. 143 * Not sure when we would need to do the augmented path (if ever) and 144 * setting this flag breaks the SMB2 open operation since it is 145 * illegal to send an empty path name (without \\server\share prefix) 146 * when the DFS flag is set in the SMB open header. We could 147 * consider setting the flag on all operations other than open 148 * but it is safer to net set it for now. 149 */ 150 /* if (tcon->share_flags & SHI1005_FLAGS_DFS) 151 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */ 152 153 if (server && server->sign && !smb3_encryption_required(tcon)) 154 shdr->Flags |= SMB2_FLAGS_SIGNED; 155 out: 156 return; 157 } 158 159 /* helper function for code reuse */ 160 static int 161 cifs_chan_skip_or_disable(struct cifs_ses *ses, 162 struct TCP_Server_Info *server, 163 bool from_reconnect) 164 { 165 struct TCP_Server_Info *pserver; 166 unsigned int chan_index; 167 168 if (SERVER_IS_CHAN(server)) { 169 cifs_dbg(VFS, 170 "server %s does not support multichannel anymore. Skip secondary channel\n", 171 ses->server->hostname); 172 173 spin_lock(&ses->chan_lock); 174 chan_index = cifs_ses_get_chan_index(ses, server); 175 if (chan_index == CIFS_INVAL_CHAN_INDEX) { 176 spin_unlock(&ses->chan_lock); 177 goto skip_terminate; 178 } 179 180 ses->chans[chan_index].server = NULL; 181 server->terminate = true; 182 spin_unlock(&ses->chan_lock); 183 184 /* 185 * the above reference of server by channel 186 * needs to be dropped without holding chan_lock 187 * as cifs_put_tcp_session takes a higher lock 188 * i.e. cifs_tcp_ses_lock 189 */ 190 cifs_put_tcp_session(server, from_reconnect); 191 192 cifs_signal_cifsd_for_reconnect(server, false); 193 194 /* mark primary server as needing reconnect */ 195 pserver = server->primary_server; 196 cifs_signal_cifsd_for_reconnect(pserver, false); 197 skip_terminate: 198 return -EHOSTDOWN; 199 } 200 201 cifs_server_dbg(VFS, 202 "server does not support multichannel anymore. Disable all other channels\n"); 203 cifs_disable_secondary_channels(ses); 204 205 206 return 0; 207 } 208 209 static int 210 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon, 211 struct TCP_Server_Info *server, bool from_reconnect) 212 { 213 int rc = 0; 214 struct nls_table *nls_codepage = NULL; 215 struct cifs_ses *ses; 216 int xid; 217 218 /* 219 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so 220 * check for tcp and smb session status done differently 221 * for those three - in the calling routine. 222 */ 223 if (tcon == NULL) 224 return 0; 225 226 /* 227 * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in 228 * cifs_tree_connect(). 229 */ 230 if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL) 231 return 0; 232 233 spin_lock(&tcon->tc_lock); 234 if (tcon->status == TID_EXITING) { 235 /* 236 * only tree disconnect allowed when disconnecting ... 237 */ 238 if (smb2_command != SMB2_TREE_DISCONNECT) { 239 spin_unlock(&tcon->tc_lock); 240 cifs_dbg(FYI, "can not send cmd %d while umounting\n", 241 smb2_command); 242 return -ENODEV; 243 } 244 } 245 spin_unlock(&tcon->tc_lock); 246 247 ses = tcon->ses; 248 if (!ses) 249 return -EIO; 250 spin_lock(&ses->ses_lock); 251 if (ses->ses_status == SES_EXITING) { 252 spin_unlock(&ses->ses_lock); 253 return -EIO; 254 } 255 spin_unlock(&ses->ses_lock); 256 if (!ses->server || !server) 257 return -EIO; 258 259 spin_lock(&server->srv_lock); 260 if (server->tcpStatus == CifsNeedReconnect) { 261 /* 262 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE 263 * here since they are implicitly done when session drops. 264 */ 265 switch (smb2_command) { 266 /* 267 * BB Should we keep oplock break and add flush to exceptions? 268 */ 269 case SMB2_TREE_DISCONNECT: 270 case SMB2_CANCEL: 271 case SMB2_CLOSE: 272 case SMB2_OPLOCK_BREAK: 273 spin_unlock(&server->srv_lock); 274 return -EAGAIN; 275 } 276 } 277 278 /* if server is marked for termination, cifsd will cleanup */ 279 if (server->terminate) { 280 spin_unlock(&server->srv_lock); 281 return -EHOSTDOWN; 282 } 283 spin_unlock(&server->srv_lock); 284 285 again: 286 rc = cifs_wait_for_server_reconnect(server, tcon->retry); 287 if (rc) 288 return rc; 289 290 spin_lock(&ses->chan_lock); 291 if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) { 292 spin_unlock(&ses->chan_lock); 293 return 0; 294 } 295 spin_unlock(&ses->chan_lock); 296 cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d", 297 tcon->ses->chans_need_reconnect, 298 tcon->need_reconnect); 299 300 mutex_lock(&ses->session_mutex); 301 /* 302 * if this is called by delayed work, and the channel has been disabled 303 * in parallel, the delayed work can continue to execute in parallel 304 * there's a chance that this channel may not exist anymore 305 */ 306 spin_lock(&server->srv_lock); 307 if (server->tcpStatus == CifsExiting) { 308 spin_unlock(&server->srv_lock); 309 mutex_unlock(&ses->session_mutex); 310 rc = -EHOSTDOWN; 311 goto out; 312 } 313 314 /* 315 * Recheck after acquire mutex. If another thread is negotiating 316 * and the server never sends an answer the socket will be closed 317 * and tcpStatus set to reconnect. 318 */ 319 if (server->tcpStatus == CifsNeedReconnect) { 320 spin_unlock(&server->srv_lock); 321 mutex_unlock(&ses->session_mutex); 322 323 if (tcon->retry) 324 goto again; 325 326 rc = -EHOSTDOWN; 327 goto out; 328 } 329 spin_unlock(&server->srv_lock); 330 331 nls_codepage = ses->local_nls; 332 333 /* 334 * need to prevent multiple threads trying to simultaneously 335 * reconnect the same SMB session 336 */ 337 spin_lock(&ses->ses_lock); 338 spin_lock(&ses->chan_lock); 339 if (!cifs_chan_needs_reconnect(ses, server) && 340 ses->ses_status == SES_GOOD) { 341 spin_unlock(&ses->chan_lock); 342 spin_unlock(&ses->ses_lock); 343 /* this means that we only need to tree connect */ 344 if (tcon->need_reconnect) 345 goto skip_sess_setup; 346 347 mutex_unlock(&ses->session_mutex); 348 goto out; 349 } 350 spin_unlock(&ses->chan_lock); 351 spin_unlock(&ses->ses_lock); 352 353 rc = cifs_negotiate_protocol(0, ses, server); 354 if (!rc) { 355 /* 356 * if server stopped supporting multichannel 357 * and the first channel reconnected, disable all the others. 358 */ 359 if (ses->chan_count > 1 && 360 !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) { 361 rc = cifs_chan_skip_or_disable(ses, server, 362 from_reconnect); 363 if (rc) { 364 mutex_unlock(&ses->session_mutex); 365 goto out; 366 } 367 } 368 369 rc = cifs_setup_session(0, ses, server, nls_codepage); 370 if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) { 371 /* 372 * Try alternate password for next reconnect (key rotation 373 * could be enabled on the server e.g.) if an alternate 374 * password is available and the current password is expired, 375 * but do not swap on non pwd related errors like host down 376 */ 377 if (ses->password2) 378 swap(ses->password2, ses->password); 379 } 380 381 if ((rc == -EACCES) && !tcon->retry) { 382 mutex_unlock(&ses->session_mutex); 383 rc = -EHOSTDOWN; 384 goto failed; 385 } else if (rc) { 386 mutex_unlock(&ses->session_mutex); 387 goto out; 388 } 389 } else { 390 mutex_unlock(&ses->session_mutex); 391 goto out; 392 } 393 394 skip_sess_setup: 395 if (!tcon->need_reconnect) { 396 mutex_unlock(&ses->session_mutex); 397 goto out; 398 } 399 cifs_mark_open_files_invalid(tcon); 400 if (tcon->use_persistent) 401 tcon->need_reopen_files = true; 402 403 rc = cifs_tree_connect(0, tcon, nls_codepage); 404 405 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc); 406 if (rc) { 407 /* If sess reconnected but tcon didn't, something strange ... */ 408 mutex_unlock(&ses->session_mutex); 409 cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc); 410 goto out; 411 } 412 413 spin_lock(&ses->ses_lock); 414 if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) { 415 spin_unlock(&ses->ses_lock); 416 mutex_unlock(&ses->session_mutex); 417 goto skip_add_channels; 418 } 419 ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS; 420 spin_unlock(&ses->ses_lock); 421 422 if (!rc && 423 (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) && 424 server->ops->query_server_interfaces) { 425 mutex_unlock(&ses->session_mutex); 426 427 /* 428 * query server network interfaces, in case they change 429 */ 430 xid = get_xid(); 431 rc = server->ops->query_server_interfaces(xid, tcon, false); 432 free_xid(xid); 433 434 if (rc == -EOPNOTSUPP && ses->chan_count > 1) { 435 /* 436 * some servers like Azure SMB server do not advertise 437 * that multichannel has been disabled with server 438 * capabilities, rather return STATUS_NOT_IMPLEMENTED. 439 * treat this as server not supporting multichannel 440 */ 441 442 rc = cifs_chan_skip_or_disable(ses, server, 443 from_reconnect); 444 goto skip_add_channels; 445 } else if (rc) 446 cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n", 447 __func__, rc); 448 449 if (ses->chan_max > ses->chan_count && 450 ses->iface_count && 451 !SERVER_IS_CHAN(server)) { 452 if (ses->chan_count == 1) { 453 cifs_server_dbg(VFS, "supports multichannel now\n"); 454 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces, 455 (SMB_INTERFACE_POLL_INTERVAL * HZ)); 456 } 457 458 cifs_try_adding_channels(ses); 459 } 460 } else { 461 mutex_unlock(&ses->session_mutex); 462 } 463 464 skip_add_channels: 465 spin_lock(&ses->ses_lock); 466 ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS; 467 spin_unlock(&ses->ses_lock); 468 469 if (smb2_command != SMB2_INTERNAL_CMD) 470 mod_delayed_work(cifsiod_wq, &server->reconnect, 0); 471 472 atomic_inc(&tconInfoReconnectCount); 473 out: 474 /* 475 * Check if handle based operation so we know whether we can continue 476 * or not without returning to caller to reset file handle. 477 */ 478 /* 479 * BB Is flush done by server on drop of tcp session? Should we special 480 * case it and skip above? 481 */ 482 switch (smb2_command) { 483 case SMB2_FLUSH: 484 case SMB2_READ: 485 case SMB2_WRITE: 486 case SMB2_LOCK: 487 case SMB2_QUERY_DIRECTORY: 488 case SMB2_CHANGE_NOTIFY: 489 case SMB2_QUERY_INFO: 490 case SMB2_SET_INFO: 491 rc = -EAGAIN; 492 } 493 failed: 494 return rc; 495 } 496 497 static void 498 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, 499 struct TCP_Server_Info *server, 500 void *buf, 501 unsigned int *total_len) 502 { 503 struct smb2_pdu *spdu = buf; 504 /* lookup word count ie StructureSize from table */ 505 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)]; 506 507 /* 508 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of 509 * largest operations (Create) 510 */ 511 memset(buf, 0, 256); 512 513 smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server); 514 spdu->StructureSize2 = cpu_to_le16(parmsize); 515 516 *total_len = parmsize + sizeof(struct smb2_hdr); 517 } 518 519 /* 520 * Allocate and return pointer to an SMB request hdr, and set basic 521 * SMB information in the SMB header. If the return code is zero, this 522 * function must have filled in request_buf pointer. 523 */ 524 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon, 525 struct TCP_Server_Info *server, 526 void **request_buf, unsigned int *total_len) 527 { 528 /* BB eventually switch this to SMB2 specific small buf size */ 529 switch (smb2_command) { 530 case SMB2_SET_INFO: 531 case SMB2_QUERY_INFO: 532 *request_buf = cifs_buf_get(); 533 break; 534 default: 535 *request_buf = cifs_small_buf_get(); 536 break; 537 } 538 if (*request_buf == NULL) { 539 /* BB should we add a retry in here if not a writepage? */ 540 return -ENOMEM; 541 } 542 543 fill_small_buf(smb2_command, tcon, server, 544 (struct smb2_hdr *)(*request_buf), 545 total_len); 546 547 if (tcon != NULL) { 548 uint16_t com_code = le16_to_cpu(smb2_command); 549 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]); 550 cifs_stats_inc(&tcon->num_smbs_sent); 551 } 552 553 return 0; 554 } 555 556 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon, 557 struct TCP_Server_Info *server, 558 void **request_buf, unsigned int *total_len) 559 { 560 int rc; 561 562 rc = smb2_reconnect(smb2_command, tcon, server, false); 563 if (rc) 564 return rc; 565 566 return __smb2_plain_req_init(smb2_command, tcon, server, request_buf, 567 total_len); 568 } 569 570 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon, 571 struct TCP_Server_Info *server, 572 void **request_buf, unsigned int *total_len) 573 { 574 /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */ 575 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) { 576 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server, 577 request_buf, total_len); 578 } 579 return smb2_plain_req_init(SMB2_IOCTL, tcon, server, 580 request_buf, total_len); 581 } 582 583 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */ 584 585 static void 586 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt) 587 { 588 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES; 589 pneg_ctxt->DataLength = cpu_to_le16(38); 590 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1); 591 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE); 592 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE); 593 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512; 594 } 595 596 static void 597 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt) 598 { 599 pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES; 600 pneg_ctxt->DataLength = 601 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context) 602 - sizeof(struct smb2_neg_context)); 603 pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3); 604 pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77; 605 pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF; 606 pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1; 607 } 608 609 static unsigned int 610 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt) 611 { 612 unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities); 613 unsigned short num_algs = 1; /* number of signing algorithms sent */ 614 615 pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES; 616 /* 617 * Context Data length must be rounded to multiple of 8 for some servers 618 */ 619 pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) - 620 sizeof(struct smb2_neg_context) + 621 (num_algs * sizeof(u16)), 8)); 622 pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs); 623 pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC); 624 625 ctxt_len += sizeof(__le16) * num_algs; 626 ctxt_len = ALIGN(ctxt_len, 8); 627 return ctxt_len; 628 /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */ 629 } 630 631 static void 632 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt) 633 { 634 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES; 635 if (require_gcm_256) { 636 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */ 637 pneg_ctxt->CipherCount = cpu_to_le16(1); 638 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM; 639 } else if (enable_gcm_256) { 640 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */ 641 pneg_ctxt->CipherCount = cpu_to_le16(3); 642 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM; 643 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM; 644 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM; 645 } else { 646 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */ 647 pneg_ctxt->CipherCount = cpu_to_le16(2); 648 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM; 649 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM; 650 } 651 } 652 653 static unsigned int 654 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname) 655 { 656 struct nls_table *cp = load_nls_default(); 657 658 pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID; 659 660 /* copy up to max of first 100 bytes of server name to NetName field */ 661 pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp)); 662 /* context size is DataLength + minimal smb2_neg_context */ 663 return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8); 664 } 665 666 static void 667 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt) 668 { 669 pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE; 670 pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN); 671 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ 672 pneg_ctxt->Name[0] = 0x93; 673 pneg_ctxt->Name[1] = 0xAD; 674 pneg_ctxt->Name[2] = 0x25; 675 pneg_ctxt->Name[3] = 0x50; 676 pneg_ctxt->Name[4] = 0x9C; 677 pneg_ctxt->Name[5] = 0xB4; 678 pneg_ctxt->Name[6] = 0x11; 679 pneg_ctxt->Name[7] = 0xE7; 680 pneg_ctxt->Name[8] = 0xB4; 681 pneg_ctxt->Name[9] = 0x23; 682 pneg_ctxt->Name[10] = 0x83; 683 pneg_ctxt->Name[11] = 0xDE; 684 pneg_ctxt->Name[12] = 0x96; 685 pneg_ctxt->Name[13] = 0x8B; 686 pneg_ctxt->Name[14] = 0xCD; 687 pneg_ctxt->Name[15] = 0x7C; 688 } 689 690 static void 691 assemble_neg_contexts(struct smb2_negotiate_req *req, 692 struct TCP_Server_Info *server, unsigned int *total_len) 693 { 694 unsigned int ctxt_len, neg_context_count; 695 struct TCP_Server_Info *pserver; 696 char *pneg_ctxt; 697 char *hostname; 698 699 if (*total_len > 200) { 700 /* In case length corrupted don't want to overrun smb buffer */ 701 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n"); 702 return; 703 } 704 705 /* 706 * round up total_len of fixed part of SMB3 negotiate request to 8 707 * byte boundary before adding negotiate contexts 708 */ 709 *total_len = ALIGN(*total_len, 8); 710 711 pneg_ctxt = (*total_len) + (char *)req; 712 req->NegotiateContextOffset = cpu_to_le32(*total_len); 713 714 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt); 715 ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8); 716 *total_len += ctxt_len; 717 pneg_ctxt += ctxt_len; 718 719 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt); 720 ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8); 721 *total_len += ctxt_len; 722 pneg_ctxt += ctxt_len; 723 724 /* 725 * secondary channels don't have the hostname field populated 726 * use the hostname field in the primary channel instead 727 */ 728 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 729 cifs_server_lock(pserver); 730 hostname = pserver->hostname; 731 if (hostname && (hostname[0] != 0)) { 732 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt, 733 hostname); 734 *total_len += ctxt_len; 735 pneg_ctxt += ctxt_len; 736 neg_context_count = 3; 737 } else 738 neg_context_count = 2; 739 cifs_server_unlock(pserver); 740 741 build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt); 742 *total_len += sizeof(struct smb2_posix_neg_context); 743 pneg_ctxt += sizeof(struct smb2_posix_neg_context); 744 neg_context_count++; 745 746 if (server->compress_algorithm) { 747 build_compression_ctxt((struct smb2_compression_capabilities_context *) 748 pneg_ctxt); 749 ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8); 750 *total_len += ctxt_len; 751 pneg_ctxt += ctxt_len; 752 neg_context_count++; 753 } 754 755 if (enable_negotiate_signing) { 756 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *) 757 pneg_ctxt); 758 *total_len += ctxt_len; 759 pneg_ctxt += ctxt_len; 760 neg_context_count++; 761 } 762 763 /* check for and add transport_capabilities and signing capabilities */ 764 req->NegotiateContextCount = cpu_to_le16(neg_context_count); 765 766 } 767 768 /* If invalid preauth context warn but use what we requested, SHA-512 */ 769 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt) 770 { 771 unsigned int len = le16_to_cpu(ctxt->DataLength); 772 773 /* 774 * Caller checked that DataLength remains within SMB boundary. We still 775 * need to confirm that one HashAlgorithms member is accounted for. 776 */ 777 if (len < MIN_PREAUTH_CTXT_DATA_LEN) { 778 pr_warn_once("server sent bad preauth context\n"); 779 return; 780 } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) { 781 pr_warn_once("server sent invalid SaltLength\n"); 782 return; 783 } 784 if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1) 785 pr_warn_once("Invalid SMB3 hash algorithm count\n"); 786 if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512) 787 pr_warn_once("unknown SMB3 hash algorithm\n"); 788 } 789 790 static void decode_compress_ctx(struct TCP_Server_Info *server, 791 struct smb2_compression_capabilities_context *ctxt) 792 { 793 unsigned int len = le16_to_cpu(ctxt->DataLength); 794 795 /* 796 * Caller checked that DataLength remains within SMB boundary. We still 797 * need to confirm that one CompressionAlgorithms member is accounted 798 * for. 799 */ 800 if (len < 10) { 801 pr_warn_once("server sent bad compression cntxt\n"); 802 return; 803 } 804 if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) { 805 pr_warn_once("Invalid SMB3 compress algorithm count\n"); 806 return; 807 } 808 if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) { 809 pr_warn_once("unknown compression algorithm\n"); 810 return; 811 } 812 server->compress_algorithm = ctxt->CompressionAlgorithms[0]; 813 } 814 815 static int decode_encrypt_ctx(struct TCP_Server_Info *server, 816 struct smb2_encryption_neg_context *ctxt) 817 { 818 unsigned int len = le16_to_cpu(ctxt->DataLength); 819 820 cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len); 821 /* 822 * Caller checked that DataLength remains within SMB boundary. We still 823 * need to confirm that one Cipher flexible array member is accounted 824 * for. 825 */ 826 if (len < MIN_ENCRYPT_CTXT_DATA_LEN) { 827 pr_warn_once("server sent bad crypto ctxt len\n"); 828 return -EINVAL; 829 } 830 831 if (le16_to_cpu(ctxt->CipherCount) != 1) { 832 pr_warn_once("Invalid SMB3.11 cipher count\n"); 833 return -EINVAL; 834 } 835 cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0])); 836 if (require_gcm_256) { 837 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) { 838 cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n"); 839 return -EOPNOTSUPP; 840 } 841 } else if (ctxt->Ciphers[0] == 0) { 842 /* 843 * e.g. if server only supported AES256_CCM (very unlikely) 844 * or server supported no encryption types or had all disabled. 845 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case 846 * in which mount requested encryption ("seal") checks later 847 * on during tree connection will return proper rc, but if 848 * seal not requested by client, since server is allowed to 849 * return 0 to indicate no supported cipher, we can't fail here 850 */ 851 server->cipher_type = 0; 852 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION; 853 pr_warn_once("Server does not support requested encryption types\n"); 854 return 0; 855 } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) && 856 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) && 857 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) { 858 /* server returned a cipher we didn't ask for */ 859 pr_warn_once("Invalid SMB3.11 cipher returned\n"); 860 return -EINVAL; 861 } 862 server->cipher_type = ctxt->Ciphers[0]; 863 server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION; 864 return 0; 865 } 866 867 static void decode_signing_ctx(struct TCP_Server_Info *server, 868 struct smb2_signing_capabilities *pctxt) 869 { 870 unsigned int len = le16_to_cpu(pctxt->DataLength); 871 872 /* 873 * Caller checked that DataLength remains within SMB boundary. We still 874 * need to confirm that one SigningAlgorithms flexible array member is 875 * accounted for. 876 */ 877 if ((len < 4) || (len > 16)) { 878 pr_warn_once("server sent bad signing negcontext\n"); 879 return; 880 } 881 if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) { 882 pr_warn_once("Invalid signing algorithm count\n"); 883 return; 884 } 885 if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) { 886 pr_warn_once("unknown signing algorithm\n"); 887 return; 888 } 889 890 server->signing_negotiated = true; 891 server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]); 892 cifs_dbg(FYI, "signing algorithm %d chosen\n", 893 server->signing_algorithm); 894 } 895 896 897 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp, 898 struct TCP_Server_Info *server, 899 unsigned int len_of_smb) 900 { 901 struct smb2_neg_context *pctx; 902 unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset); 903 unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount); 904 unsigned int len_of_ctxts, i; 905 int rc = 0; 906 907 cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt); 908 if (len_of_smb <= offset) { 909 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n"); 910 return -EINVAL; 911 } 912 913 len_of_ctxts = len_of_smb - offset; 914 915 for (i = 0; i < ctxt_cnt; i++) { 916 int clen; 917 /* check that offset is not beyond end of SMB */ 918 if (len_of_ctxts < sizeof(struct smb2_neg_context)) 919 break; 920 921 pctx = (struct smb2_neg_context *)(offset + (char *)rsp); 922 clen = sizeof(struct smb2_neg_context) 923 + le16_to_cpu(pctx->DataLength); 924 /* 925 * 2.2.4 SMB2 NEGOTIATE Response 926 * Subsequent negotiate contexts MUST appear at the first 8-byte 927 * aligned offset following the previous negotiate context. 928 */ 929 if (i + 1 != ctxt_cnt) 930 clen = ALIGN(clen, 8); 931 if (clen > len_of_ctxts) 932 break; 933 934 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES) 935 decode_preauth_context( 936 (struct smb2_preauth_neg_context *)pctx); 937 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES) 938 rc = decode_encrypt_ctx(server, 939 (struct smb2_encryption_neg_context *)pctx); 940 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES) 941 decode_compress_ctx(server, 942 (struct smb2_compression_capabilities_context *)pctx); 943 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE) 944 server->posix_ext_supported = true; 945 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES) 946 decode_signing_ctx(server, 947 (struct smb2_signing_capabilities *)pctx); 948 else 949 cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n", 950 le16_to_cpu(pctx->ContextType)); 951 if (rc) 952 break; 953 954 offset += clen; 955 len_of_ctxts -= clen; 956 } 957 return rc; 958 } 959 960 static struct create_posix * 961 create_posix_buf(umode_t mode) 962 { 963 struct create_posix *buf; 964 965 buf = kzalloc(sizeof(struct create_posix), 966 GFP_KERNEL); 967 if (!buf) 968 return NULL; 969 970 buf->ccontext.DataOffset = 971 cpu_to_le16(offsetof(struct create_posix, Mode)); 972 buf->ccontext.DataLength = cpu_to_le32(4); 973 buf->ccontext.NameOffset = 974 cpu_to_le16(offsetof(struct create_posix, Name)); 975 buf->ccontext.NameLength = cpu_to_le16(16); 976 977 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ 978 buf->Name[0] = 0x93; 979 buf->Name[1] = 0xAD; 980 buf->Name[2] = 0x25; 981 buf->Name[3] = 0x50; 982 buf->Name[4] = 0x9C; 983 buf->Name[5] = 0xB4; 984 buf->Name[6] = 0x11; 985 buf->Name[7] = 0xE7; 986 buf->Name[8] = 0xB4; 987 buf->Name[9] = 0x23; 988 buf->Name[10] = 0x83; 989 buf->Name[11] = 0xDE; 990 buf->Name[12] = 0x96; 991 buf->Name[13] = 0x8B; 992 buf->Name[14] = 0xCD; 993 buf->Name[15] = 0x7C; 994 buf->Mode = cpu_to_le32(mode); 995 cifs_dbg(FYI, "mode on posix create 0%o\n", mode); 996 return buf; 997 } 998 999 static int 1000 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode) 1001 { 1002 unsigned int num = *num_iovec; 1003 1004 iov[num].iov_base = create_posix_buf(mode); 1005 if (mode == ACL_NO_MODE) 1006 cifs_dbg(FYI, "%s: no mode\n", __func__); 1007 if (iov[num].iov_base == NULL) 1008 return -ENOMEM; 1009 iov[num].iov_len = sizeof(struct create_posix); 1010 *num_iovec = num + 1; 1011 return 0; 1012 } 1013 1014 1015 /* 1016 * 1017 * SMB2 Worker functions follow: 1018 * 1019 * The general structure of the worker functions is: 1020 * 1) Call smb2_init (assembles SMB2 header) 1021 * 2) Initialize SMB2 command specific fields in fixed length area of SMB 1022 * 3) Call smb_sendrcv2 (sends request on socket and waits for response) 1023 * 4) Decode SMB2 command specific fields in the fixed length area 1024 * 5) Decode variable length data area (if any for this SMB2 command type) 1025 * 6) Call free smb buffer 1026 * 7) return 1027 * 1028 */ 1029 1030 int 1031 SMB2_negotiate(const unsigned int xid, 1032 struct cifs_ses *ses, 1033 struct TCP_Server_Info *server) 1034 { 1035 struct smb_rqst rqst; 1036 struct smb2_negotiate_req *req; 1037 struct smb2_negotiate_rsp *rsp; 1038 struct kvec iov[1]; 1039 struct kvec rsp_iov; 1040 int rc; 1041 int resp_buftype; 1042 int blob_offset, blob_length; 1043 char *security_blob; 1044 int flags = CIFS_NEG_OP; 1045 unsigned int total_len; 1046 1047 cifs_dbg(FYI, "Negotiate protocol\n"); 1048 1049 if (!server) { 1050 WARN(1, "%s: server is NULL!\n", __func__); 1051 return -EIO; 1052 } 1053 1054 rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server, 1055 (void **) &req, &total_len); 1056 if (rc) 1057 return rc; 1058 1059 req->hdr.SessionId = 0; 1060 1061 memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE); 1062 memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE); 1063 1064 if (strcmp(server->vals->version_string, 1065 SMB3ANY_VERSION_STRING) == 0) { 1066 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); 1067 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); 1068 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID); 1069 req->DialectCount = cpu_to_le16(3); 1070 total_len += 6; 1071 } else if (strcmp(server->vals->version_string, 1072 SMBDEFAULT_VERSION_STRING) == 0) { 1073 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); 1074 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); 1075 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); 1076 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID); 1077 req->DialectCount = cpu_to_le16(4); 1078 total_len += 8; 1079 } else { 1080 /* otherwise send specific dialect */ 1081 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id); 1082 req->DialectCount = cpu_to_le16(1); 1083 total_len += 2; 1084 } 1085 1086 /* only one of SMB2 signing flags may be set in SMB2 request */ 1087 if (ses->sign) 1088 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); 1089 else if (global_secflags & CIFSSEC_MAY_SIGN) 1090 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); 1091 else 1092 req->SecurityMode = 0; 1093 1094 req->Capabilities = cpu_to_le32(server->vals->req_capabilities); 1095 if (ses->chan_max > 1) 1096 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL); 1097 1098 /* ClientGUID must be zero for SMB2.02 dialect */ 1099 if (server->vals->protocol_id == SMB20_PROT_ID) 1100 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE); 1101 else { 1102 memcpy(req->ClientGUID, server->client_guid, 1103 SMB2_CLIENT_GUID_SIZE); 1104 if ((server->vals->protocol_id == SMB311_PROT_ID) || 1105 (strcmp(server->vals->version_string, 1106 SMB3ANY_VERSION_STRING) == 0) || 1107 (strcmp(server->vals->version_string, 1108 SMBDEFAULT_VERSION_STRING) == 0)) 1109 assemble_neg_contexts(req, server, &total_len); 1110 } 1111 iov[0].iov_base = (char *)req; 1112 iov[0].iov_len = total_len; 1113 1114 memset(&rqst, 0, sizeof(struct smb_rqst)); 1115 rqst.rq_iov = iov; 1116 rqst.rq_nvec = 1; 1117 1118 rc = cifs_send_recv(xid, ses, server, 1119 &rqst, &resp_buftype, flags, &rsp_iov); 1120 cifs_small_buf_release(req); 1121 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base; 1122 /* 1123 * No tcon so can't do 1124 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); 1125 */ 1126 if (rc == -EOPNOTSUPP) { 1127 cifs_server_dbg(VFS, "Dialect not supported by server. Consider specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n"); 1128 goto neg_exit; 1129 } else if (rc != 0) 1130 goto neg_exit; 1131 1132 rc = -EIO; 1133 if (strcmp(server->vals->version_string, 1134 SMB3ANY_VERSION_STRING) == 0) { 1135 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) { 1136 cifs_server_dbg(VFS, 1137 "SMB2 dialect returned but not requested\n"); 1138 goto neg_exit; 1139 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) { 1140 cifs_server_dbg(VFS, 1141 "SMB2.1 dialect returned but not requested\n"); 1142 goto neg_exit; 1143 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) { 1144 /* ops set to 3.0 by default for default so update */ 1145 server->ops = &smb311_operations; 1146 server->vals = &smb311_values; 1147 } 1148 } else if (strcmp(server->vals->version_string, 1149 SMBDEFAULT_VERSION_STRING) == 0) { 1150 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) { 1151 cifs_server_dbg(VFS, 1152 "SMB2 dialect returned but not requested\n"); 1153 goto neg_exit; 1154 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) { 1155 /* ops set to 3.0 by default for default so update */ 1156 server->ops = &smb21_operations; 1157 server->vals = &smb21_values; 1158 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) { 1159 server->ops = &smb311_operations; 1160 server->vals = &smb311_values; 1161 } 1162 } else if (le16_to_cpu(rsp->DialectRevision) != 1163 server->vals->protocol_id) { 1164 /* if requested single dialect ensure returned dialect matched */ 1165 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n", 1166 le16_to_cpu(rsp->DialectRevision)); 1167 goto neg_exit; 1168 } 1169 1170 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode); 1171 1172 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) 1173 cifs_dbg(FYI, "negotiated smb2.0 dialect\n"); 1174 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) 1175 cifs_dbg(FYI, "negotiated smb2.1 dialect\n"); 1176 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID)) 1177 cifs_dbg(FYI, "negotiated smb3.0 dialect\n"); 1178 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID)) 1179 cifs_dbg(FYI, "negotiated smb3.02 dialect\n"); 1180 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) 1181 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n"); 1182 else { 1183 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n", 1184 le16_to_cpu(rsp->DialectRevision)); 1185 goto neg_exit; 1186 } 1187 1188 rc = 0; 1189 server->dialect = le16_to_cpu(rsp->DialectRevision); 1190 1191 /* 1192 * Keep a copy of the hash after negprot. This hash will be 1193 * the starting hash value for all sessions made from this 1194 * server. 1195 */ 1196 memcpy(server->preauth_sha_hash, ses->preauth_sha_hash, 1197 SMB2_PREAUTH_HASH_SIZE); 1198 1199 /* SMB2 only has an extended negflavor */ 1200 server->negflavor = CIFS_NEGFLAVOR_EXTENDED; 1201 /* set it to the maximum buffer size value we can send with 1 credit */ 1202 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize), 1203 SMB2_MAX_BUFFER_SIZE); 1204 server->max_read = le32_to_cpu(rsp->MaxReadSize); 1205 server->max_write = le32_to_cpu(rsp->MaxWriteSize); 1206 server->sec_mode = le16_to_cpu(rsp->SecurityMode); 1207 if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode) 1208 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n", 1209 server->sec_mode); 1210 server->capabilities = le32_to_cpu(rsp->Capabilities); 1211 /* Internal types */ 1212 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES; 1213 1214 /* 1215 * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context 1216 * Set the cipher type manually. 1217 */ 1218 if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 1219 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM; 1220 1221 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length, 1222 (struct smb2_hdr *)rsp); 1223 /* 1224 * See MS-SMB2 section 2.2.4: if no blob, client picks default which 1225 * for us will be 1226 * ses->sectype = RawNTLMSSP; 1227 * but for time being this is our only auth choice so doesn't matter. 1228 * We just found a server which sets blob length to zero expecting raw. 1229 */ 1230 if (blob_length == 0) { 1231 cifs_dbg(FYI, "missing security blob on negprot\n"); 1232 server->sec_ntlmssp = true; 1233 } 1234 1235 rc = cifs_enable_signing(server, ses->sign); 1236 if (rc) 1237 goto neg_exit; 1238 if (blob_length) { 1239 rc = decode_negTokenInit(security_blob, blob_length, server); 1240 if (rc == 1) 1241 rc = 0; 1242 else if (rc == 0) 1243 rc = -EIO; 1244 } 1245 1246 if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) { 1247 if (rsp->NegotiateContextCount) 1248 rc = smb311_decode_neg_context(rsp, server, 1249 rsp_iov.iov_len); 1250 else 1251 cifs_server_dbg(VFS, "Missing expected negotiate contexts\n"); 1252 } 1253 neg_exit: 1254 free_rsp_buf(resp_buftype, rsp); 1255 return rc; 1256 } 1257 1258 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) 1259 { 1260 int rc; 1261 struct validate_negotiate_info_req *pneg_inbuf; 1262 struct validate_negotiate_info_rsp *pneg_rsp = NULL; 1263 u32 rsplen; 1264 u32 inbuflen; /* max of 4 dialects */ 1265 struct TCP_Server_Info *server = tcon->ses->server; 1266 1267 cifs_dbg(FYI, "validate negotiate\n"); 1268 1269 /* In SMB3.11 preauth integrity supersedes validate negotiate */ 1270 if (server->dialect == SMB311_PROT_ID) 1271 return 0; 1272 1273 /* 1274 * validation ioctl must be signed, so no point sending this if we 1275 * can not sign it (ie are not known user). Even if signing is not 1276 * required (enabled but not negotiated), in those cases we selectively 1277 * sign just this, the first and only signed request on a connection. 1278 * Having validation of negotiate info helps reduce attack vectors. 1279 */ 1280 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) 1281 return 0; /* validation requires signing */ 1282 1283 if (tcon->ses->user_name == NULL) { 1284 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n"); 1285 return 0; /* validation requires signing */ 1286 } 1287 1288 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL) 1289 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n"); 1290 1291 pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS); 1292 if (!pneg_inbuf) 1293 return -ENOMEM; 1294 1295 pneg_inbuf->Capabilities = 1296 cpu_to_le32(server->vals->req_capabilities); 1297 if (tcon->ses->chan_max > 1) 1298 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL); 1299 1300 memcpy(pneg_inbuf->Guid, server->client_guid, 1301 SMB2_CLIENT_GUID_SIZE); 1302 1303 if (tcon->ses->sign) 1304 pneg_inbuf->SecurityMode = 1305 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); 1306 else if (global_secflags & CIFSSEC_MAY_SIGN) 1307 pneg_inbuf->SecurityMode = 1308 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); 1309 else 1310 pneg_inbuf->SecurityMode = 0; 1311 1312 1313 if (strcmp(server->vals->version_string, 1314 SMB3ANY_VERSION_STRING) == 0) { 1315 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); 1316 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); 1317 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID); 1318 pneg_inbuf->DialectCount = cpu_to_le16(3); 1319 /* SMB 2.1 not included so subtract one dialect from len */ 1320 inbuflen = sizeof(*pneg_inbuf) - 1321 (sizeof(pneg_inbuf->Dialects[0])); 1322 } else if (strcmp(server->vals->version_string, 1323 SMBDEFAULT_VERSION_STRING) == 0) { 1324 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); 1325 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); 1326 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); 1327 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID); 1328 pneg_inbuf->DialectCount = cpu_to_le16(4); 1329 /* structure is big enough for 4 dialects */ 1330 inbuflen = sizeof(*pneg_inbuf); 1331 } else { 1332 /* otherwise specific dialect was requested */ 1333 pneg_inbuf->Dialects[0] = 1334 cpu_to_le16(server->vals->protocol_id); 1335 pneg_inbuf->DialectCount = cpu_to_le16(1); 1336 /* structure is big enough for 4 dialects, sending only 1 */ 1337 inbuflen = sizeof(*pneg_inbuf) - 1338 sizeof(pneg_inbuf->Dialects[0]) * 3; 1339 } 1340 1341 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, 1342 FSCTL_VALIDATE_NEGOTIATE_INFO, 1343 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize, 1344 (char **)&pneg_rsp, &rsplen); 1345 if (rc == -EOPNOTSUPP) { 1346 /* 1347 * Old Windows versions or Netapp SMB server can return 1348 * not supported error. Client should accept it. 1349 */ 1350 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n"); 1351 rc = 0; 1352 goto out_free_inbuf; 1353 } else if (rc != 0) { 1354 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n", 1355 rc); 1356 rc = -EIO; 1357 goto out_free_inbuf; 1358 } 1359 1360 rc = -EIO; 1361 if (rsplen != sizeof(*pneg_rsp)) { 1362 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n", 1363 rsplen); 1364 1365 /* relax check since Mac returns max bufsize allowed on ioctl */ 1366 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp)) 1367 goto out_free_rsp; 1368 } 1369 1370 /* check validate negotiate info response matches what we got earlier */ 1371 if (pneg_rsp->Dialect != cpu_to_le16(server->dialect)) 1372 goto vneg_out; 1373 1374 if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode)) 1375 goto vneg_out; 1376 1377 /* do not validate server guid because not saved at negprot time yet */ 1378 1379 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND | 1380 SMB2_LARGE_FILES) != server->capabilities) 1381 goto vneg_out; 1382 1383 /* validate negotiate successful */ 1384 rc = 0; 1385 cifs_dbg(FYI, "validate negotiate info successful\n"); 1386 goto out_free_rsp; 1387 1388 vneg_out: 1389 cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n"); 1390 out_free_rsp: 1391 kfree(pneg_rsp); 1392 out_free_inbuf: 1393 kfree(pneg_inbuf); 1394 return rc; 1395 } 1396 1397 enum securityEnum 1398 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) 1399 { 1400 switch (requested) { 1401 case Kerberos: 1402 case RawNTLMSSP: 1403 return requested; 1404 case NTLMv2: 1405 return RawNTLMSSP; 1406 case Unspecified: 1407 if (server->sec_ntlmssp && 1408 (global_secflags & CIFSSEC_MAY_NTLMSSP)) 1409 return RawNTLMSSP; 1410 if ((server->sec_kerberos || server->sec_mskerberos) && 1411 (global_secflags & CIFSSEC_MAY_KRB5)) 1412 return Kerberos; 1413 fallthrough; 1414 default: 1415 return Unspecified; 1416 } 1417 } 1418 1419 struct SMB2_sess_data { 1420 unsigned int xid; 1421 struct cifs_ses *ses; 1422 struct TCP_Server_Info *server; 1423 struct nls_table *nls_cp; 1424 void (*func)(struct SMB2_sess_data *); 1425 int result; 1426 u64 previous_session; 1427 1428 /* we will send the SMB in three pieces: 1429 * a fixed length beginning part, an optional 1430 * SPNEGO blob (which can be zero length), and a 1431 * last part which will include the strings 1432 * and rest of bcc area. This allows us to avoid 1433 * a large buffer 17K allocation 1434 */ 1435 int buf0_type; 1436 struct kvec iov[2]; 1437 }; 1438 1439 static int 1440 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data) 1441 { 1442 int rc; 1443 struct cifs_ses *ses = sess_data->ses; 1444 struct TCP_Server_Info *server = sess_data->server; 1445 struct smb2_sess_setup_req *req; 1446 unsigned int total_len; 1447 bool is_binding = false; 1448 1449 rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server, 1450 (void **) &req, 1451 &total_len); 1452 if (rc) 1453 return rc; 1454 1455 spin_lock(&ses->ses_lock); 1456 is_binding = (ses->ses_status == SES_GOOD); 1457 spin_unlock(&ses->ses_lock); 1458 1459 if (is_binding) { 1460 req->hdr.SessionId = cpu_to_le64(ses->Suid); 1461 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 1462 req->PreviousSessionId = 0; 1463 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING; 1464 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid); 1465 } else { 1466 /* First session, not a reauthenticate */ 1467 req->hdr.SessionId = 0; 1468 /* 1469 * if reconnect, we need to send previous sess id 1470 * otherwise it is 0 1471 */ 1472 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session); 1473 req->Flags = 0; /* MBZ */ 1474 cifs_dbg(FYI, "Fresh session. Previous: %llx\n", 1475 sess_data->previous_session); 1476 } 1477 1478 /* enough to enable echos and oplocks and one max size write */ 1479 if (server->credits >= server->max_credits) 1480 req->hdr.CreditRequest = cpu_to_le16(0); 1481 else 1482 req->hdr.CreditRequest = cpu_to_le16( 1483 min_t(int, server->max_credits - 1484 server->credits, 130)); 1485 1486 /* only one of SMB2 signing flags may be set in SMB2 request */ 1487 if (server->sign) 1488 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED; 1489 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */ 1490 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED; 1491 else 1492 req->SecurityMode = 0; 1493 1494 #ifdef CONFIG_CIFS_DFS_UPCALL 1495 req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS); 1496 #else 1497 req->Capabilities = 0; 1498 #endif /* DFS_UPCALL */ 1499 1500 req->Channel = 0; /* MBZ */ 1501 1502 sess_data->iov[0].iov_base = (char *)req; 1503 /* 1 for pad */ 1504 sess_data->iov[0].iov_len = total_len - 1; 1505 /* 1506 * This variable will be used to clear the buffer 1507 * allocated above in case of any error in the calling function. 1508 */ 1509 sess_data->buf0_type = CIFS_SMALL_BUFFER; 1510 1511 return 0; 1512 } 1513 1514 static void 1515 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data) 1516 { 1517 struct kvec *iov = sess_data->iov; 1518 1519 /* iov[1] is already freed by caller */ 1520 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base) 1521 memzero_explicit(iov[0].iov_base, iov[0].iov_len); 1522 1523 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base); 1524 sess_data->buf0_type = CIFS_NO_BUFFER; 1525 } 1526 1527 static int 1528 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data) 1529 { 1530 int rc; 1531 struct smb_rqst rqst; 1532 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base; 1533 struct kvec rsp_iov = { NULL, 0 }; 1534 1535 /* Testing shows that buffer offset must be at location of Buffer[0] */ 1536 req->SecurityBufferOffset = 1537 cpu_to_le16(sizeof(struct smb2_sess_setup_req)); 1538 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len); 1539 1540 memset(&rqst, 0, sizeof(struct smb_rqst)); 1541 rqst.rq_iov = sess_data->iov; 1542 rqst.rq_nvec = 2; 1543 1544 /* BB add code to build os and lm fields */ 1545 rc = cifs_send_recv(sess_data->xid, sess_data->ses, 1546 sess_data->server, 1547 &rqst, 1548 &sess_data->buf0_type, 1549 CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov); 1550 cifs_small_buf_release(sess_data->iov[0].iov_base); 1551 if (rc == 0) 1552 sess_data->ses->expired_pwd = false; 1553 else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) 1554 sess_data->ses->expired_pwd = true; 1555 1556 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec)); 1557 1558 return rc; 1559 } 1560 1561 static int 1562 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data) 1563 { 1564 int rc = 0; 1565 struct cifs_ses *ses = sess_data->ses; 1566 struct TCP_Server_Info *server = sess_data->server; 1567 1568 cifs_server_lock(server); 1569 if (server->ops->generate_signingkey) { 1570 rc = server->ops->generate_signingkey(ses, server); 1571 if (rc) { 1572 cifs_dbg(FYI, 1573 "SMB3 session key generation failed\n"); 1574 cifs_server_unlock(server); 1575 return rc; 1576 } 1577 } 1578 if (!server->session_estab) { 1579 server->sequence_number = 0x2; 1580 server->session_estab = true; 1581 } 1582 cifs_server_unlock(server); 1583 1584 cifs_dbg(FYI, "SMB2/3 session established successfully\n"); 1585 return rc; 1586 } 1587 1588 #ifdef CONFIG_CIFS_UPCALL 1589 static void 1590 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) 1591 { 1592 int rc; 1593 struct cifs_ses *ses = sess_data->ses; 1594 struct TCP_Server_Info *server = sess_data->server; 1595 struct cifs_spnego_msg *msg; 1596 struct key *spnego_key = NULL; 1597 struct smb2_sess_setup_rsp *rsp = NULL; 1598 bool is_binding = false; 1599 1600 rc = SMB2_sess_alloc_buffer(sess_data); 1601 if (rc) 1602 goto out; 1603 1604 spnego_key = cifs_get_spnego_key(ses, server); 1605 if (IS_ERR(spnego_key)) { 1606 rc = PTR_ERR(spnego_key); 1607 if (rc == -ENOKEY) 1608 cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n"); 1609 spnego_key = NULL; 1610 goto out; 1611 } 1612 1613 msg = spnego_key->payload.data[0]; 1614 /* 1615 * check version field to make sure that cifs.upcall is 1616 * sending us a response in an expected form 1617 */ 1618 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 1619 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n", 1620 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 1621 rc = -EKEYREJECTED; 1622 goto out_put_spnego_key; 1623 } 1624 1625 spin_lock(&ses->ses_lock); 1626 is_binding = (ses->ses_status == SES_GOOD); 1627 spin_unlock(&ses->ses_lock); 1628 1629 /* keep session key if binding */ 1630 if (!is_binding) { 1631 kfree_sensitive(ses->auth_key.response); 1632 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, 1633 GFP_KERNEL); 1634 if (!ses->auth_key.response) { 1635 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n", 1636 msg->sesskey_len); 1637 rc = -ENOMEM; 1638 goto out_put_spnego_key; 1639 } 1640 ses->auth_key.len = msg->sesskey_len; 1641 } 1642 1643 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; 1644 sess_data->iov[1].iov_len = msg->secblob_len; 1645 1646 rc = SMB2_sess_sendreceive(sess_data); 1647 if (rc) 1648 goto out_put_spnego_key; 1649 1650 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; 1651 /* keep session id and flags if binding */ 1652 if (!is_binding) { 1653 ses->Suid = le64_to_cpu(rsp->hdr.SessionId); 1654 ses->session_flags = le16_to_cpu(rsp->SessionFlags); 1655 } 1656 1657 rc = SMB2_sess_establish_session(sess_data); 1658 out_put_spnego_key: 1659 key_invalidate(spnego_key); 1660 key_put(spnego_key); 1661 if (rc) { 1662 kfree_sensitive(ses->auth_key.response); 1663 ses->auth_key.response = NULL; 1664 ses->auth_key.len = 0; 1665 } 1666 out: 1667 sess_data->result = rc; 1668 sess_data->func = NULL; 1669 SMB2_sess_free_buffer(sess_data); 1670 } 1671 #else 1672 static void 1673 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) 1674 { 1675 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); 1676 sess_data->result = -EOPNOTSUPP; 1677 sess_data->func = NULL; 1678 } 1679 #endif 1680 1681 static void 1682 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data); 1683 1684 static void 1685 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data) 1686 { 1687 int rc; 1688 struct cifs_ses *ses = sess_data->ses; 1689 struct TCP_Server_Info *server = sess_data->server; 1690 struct smb2_sess_setup_rsp *rsp = NULL; 1691 unsigned char *ntlmssp_blob = NULL; 1692 bool use_spnego = false; /* else use raw ntlmssp */ 1693 u16 blob_length = 0; 1694 bool is_binding = false; 1695 1696 /* 1697 * If memory allocation is successful, caller of this function 1698 * frees it. 1699 */ 1700 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); 1701 if (!ses->ntlmssp) { 1702 rc = -ENOMEM; 1703 goto out_err; 1704 } 1705 ses->ntlmssp->sesskey_per_smbsess = true; 1706 1707 rc = SMB2_sess_alloc_buffer(sess_data); 1708 if (rc) 1709 goto out_err; 1710 1711 rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob, 1712 &blob_length, ses, server, 1713 sess_data->nls_cp); 1714 if (rc) 1715 goto out; 1716 1717 if (use_spnego) { 1718 /* BB eventually need to add this */ 1719 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); 1720 rc = -EOPNOTSUPP; 1721 goto out; 1722 } 1723 sess_data->iov[1].iov_base = ntlmssp_blob; 1724 sess_data->iov[1].iov_len = blob_length; 1725 1726 rc = SMB2_sess_sendreceive(sess_data); 1727 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; 1728 1729 /* If true, rc here is expected and not an error */ 1730 if (sess_data->buf0_type != CIFS_NO_BUFFER && 1731 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) 1732 rc = 0; 1733 1734 if (rc) 1735 goto out; 1736 1737 if (offsetof(struct smb2_sess_setup_rsp, Buffer) != 1738 le16_to_cpu(rsp->SecurityBufferOffset)) { 1739 cifs_dbg(VFS, "Invalid security buffer offset %d\n", 1740 le16_to_cpu(rsp->SecurityBufferOffset)); 1741 rc = -EIO; 1742 goto out; 1743 } 1744 rc = decode_ntlmssp_challenge(rsp->Buffer, 1745 le16_to_cpu(rsp->SecurityBufferLength), ses); 1746 if (rc) 1747 goto out; 1748 1749 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); 1750 1751 spin_lock(&ses->ses_lock); 1752 is_binding = (ses->ses_status == SES_GOOD); 1753 spin_unlock(&ses->ses_lock); 1754 1755 /* keep existing ses id and flags if binding */ 1756 if (!is_binding) { 1757 ses->Suid = le64_to_cpu(rsp->hdr.SessionId); 1758 ses->session_flags = le16_to_cpu(rsp->SessionFlags); 1759 } 1760 1761 out: 1762 kfree_sensitive(ntlmssp_blob); 1763 SMB2_sess_free_buffer(sess_data); 1764 if (!rc) { 1765 sess_data->result = 0; 1766 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate; 1767 return; 1768 } 1769 out_err: 1770 kfree_sensitive(ses->ntlmssp); 1771 ses->ntlmssp = NULL; 1772 sess_data->result = rc; 1773 sess_data->func = NULL; 1774 } 1775 1776 static void 1777 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data) 1778 { 1779 int rc; 1780 struct cifs_ses *ses = sess_data->ses; 1781 struct TCP_Server_Info *server = sess_data->server; 1782 struct smb2_sess_setup_req *req; 1783 struct smb2_sess_setup_rsp *rsp = NULL; 1784 unsigned char *ntlmssp_blob = NULL; 1785 bool use_spnego = false; /* else use raw ntlmssp */ 1786 u16 blob_length = 0; 1787 bool is_binding = false; 1788 1789 rc = SMB2_sess_alloc_buffer(sess_data); 1790 if (rc) 1791 goto out; 1792 1793 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base; 1794 req->hdr.SessionId = cpu_to_le64(ses->Suid); 1795 1796 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, 1797 ses, server, 1798 sess_data->nls_cp); 1799 if (rc) { 1800 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc); 1801 goto out; 1802 } 1803 1804 if (use_spnego) { 1805 /* BB eventually need to add this */ 1806 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); 1807 rc = -EOPNOTSUPP; 1808 goto out; 1809 } 1810 sess_data->iov[1].iov_base = ntlmssp_blob; 1811 sess_data->iov[1].iov_len = blob_length; 1812 1813 rc = SMB2_sess_sendreceive(sess_data); 1814 if (rc) 1815 goto out; 1816 1817 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; 1818 1819 spin_lock(&ses->ses_lock); 1820 is_binding = (ses->ses_status == SES_GOOD); 1821 spin_unlock(&ses->ses_lock); 1822 1823 /* keep existing ses id and flags if binding */ 1824 if (!is_binding) { 1825 ses->Suid = le64_to_cpu(rsp->hdr.SessionId); 1826 ses->session_flags = le16_to_cpu(rsp->SessionFlags); 1827 } 1828 1829 rc = SMB2_sess_establish_session(sess_data); 1830 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS 1831 if (ses->server->dialect < SMB30_PROT_ID) { 1832 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__); 1833 /* 1834 * The session id is opaque in terms of endianness, so we can't 1835 * print it as a long long. we dump it as we got it on the wire 1836 */ 1837 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid), 1838 &ses->Suid); 1839 cifs_dbg(VFS, "Session Key %*ph\n", 1840 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response); 1841 cifs_dbg(VFS, "Signing Key %*ph\n", 1842 SMB3_SIGN_KEY_SIZE, ses->auth_key.response); 1843 } 1844 #endif 1845 out: 1846 kfree_sensitive(ntlmssp_blob); 1847 SMB2_sess_free_buffer(sess_data); 1848 kfree_sensitive(ses->ntlmssp); 1849 ses->ntlmssp = NULL; 1850 sess_data->result = rc; 1851 sess_data->func = NULL; 1852 } 1853 1854 static int 1855 SMB2_select_sec(struct SMB2_sess_data *sess_data) 1856 { 1857 int type; 1858 struct cifs_ses *ses = sess_data->ses; 1859 struct TCP_Server_Info *server = sess_data->server; 1860 1861 type = smb2_select_sectype(server, ses->sectype); 1862 cifs_dbg(FYI, "sess setup type %d\n", type); 1863 if (type == Unspecified) { 1864 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n"); 1865 return -EINVAL; 1866 } 1867 1868 switch (type) { 1869 case Kerberos: 1870 sess_data->func = SMB2_auth_kerberos; 1871 break; 1872 case RawNTLMSSP: 1873 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate; 1874 break; 1875 default: 1876 cifs_dbg(VFS, "secType %d not supported!\n", type); 1877 return -EOPNOTSUPP; 1878 } 1879 1880 return 0; 1881 } 1882 1883 int 1884 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses, 1885 struct TCP_Server_Info *server, 1886 const struct nls_table *nls_cp) 1887 { 1888 int rc = 0; 1889 struct SMB2_sess_data *sess_data; 1890 1891 cifs_dbg(FYI, "Session Setup\n"); 1892 1893 if (!server) { 1894 WARN(1, "%s: server is NULL!\n", __func__); 1895 return -EIO; 1896 } 1897 1898 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL); 1899 if (!sess_data) 1900 return -ENOMEM; 1901 1902 sess_data->xid = xid; 1903 sess_data->ses = ses; 1904 sess_data->server = server; 1905 sess_data->buf0_type = CIFS_NO_BUFFER; 1906 sess_data->nls_cp = (struct nls_table *) nls_cp; 1907 sess_data->previous_session = ses->Suid; 1908 1909 rc = SMB2_select_sec(sess_data); 1910 if (rc) 1911 goto out; 1912 1913 /* 1914 * Initialize the session hash with the server one. 1915 */ 1916 memcpy(ses->preauth_sha_hash, server->preauth_sha_hash, 1917 SMB2_PREAUTH_HASH_SIZE); 1918 1919 while (sess_data->func) 1920 sess_data->func(sess_data); 1921 1922 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign)) 1923 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n"); 1924 rc = sess_data->result; 1925 out: 1926 kfree_sensitive(sess_data); 1927 return rc; 1928 } 1929 1930 int 1931 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses) 1932 { 1933 struct smb_rqst rqst; 1934 struct smb2_logoff_req *req; /* response is also trivial struct */ 1935 int rc = 0; 1936 struct TCP_Server_Info *server; 1937 int flags = 0; 1938 unsigned int total_len; 1939 struct kvec iov[1]; 1940 struct kvec rsp_iov; 1941 int resp_buf_type; 1942 1943 cifs_dbg(FYI, "disconnect session %p\n", ses); 1944 1945 if (ses && (ses->server)) 1946 server = ses->server; 1947 else 1948 return -EIO; 1949 1950 /* no need to send SMB logoff if uid already closed due to reconnect */ 1951 spin_lock(&ses->chan_lock); 1952 if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) { 1953 spin_unlock(&ses->chan_lock); 1954 goto smb2_session_already_dead; 1955 } 1956 spin_unlock(&ses->chan_lock); 1957 1958 rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server, 1959 (void **) &req, &total_len); 1960 if (rc) 1961 return rc; 1962 1963 /* since no tcon, smb2_init can not do this, so do here */ 1964 req->hdr.SessionId = cpu_to_le64(ses->Suid); 1965 1966 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) 1967 flags |= CIFS_TRANSFORM_REQ; 1968 else if (server->sign) 1969 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 1970 1971 flags |= CIFS_NO_RSP_BUF; 1972 1973 iov[0].iov_base = (char *)req; 1974 iov[0].iov_len = total_len; 1975 1976 memset(&rqst, 0, sizeof(struct smb_rqst)); 1977 rqst.rq_iov = iov; 1978 rqst.rq_nvec = 1; 1979 1980 rc = cifs_send_recv(xid, ses, ses->server, 1981 &rqst, &resp_buf_type, flags, &rsp_iov); 1982 cifs_small_buf_release(req); 1983 /* 1984 * No tcon so can't do 1985 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); 1986 */ 1987 1988 smb2_session_already_dead: 1989 return rc; 1990 } 1991 1992 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code) 1993 { 1994 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]); 1995 } 1996 1997 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */) 1998 1999 /* These are similar values to what Windows uses */ 2000 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon) 2001 { 2002 tcon->max_chunks = 256; 2003 tcon->max_bytes_chunk = 1048576; 2004 tcon->max_bytes_copy = 16777216; 2005 } 2006 2007 int 2008 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree, 2009 struct cifs_tcon *tcon, const struct nls_table *cp) 2010 { 2011 struct smb_rqst rqst; 2012 struct smb2_tree_connect_req *req; 2013 struct smb2_tree_connect_rsp *rsp = NULL; 2014 struct kvec iov[2]; 2015 struct kvec rsp_iov = { NULL, 0 }; 2016 int rc = 0; 2017 int resp_buftype; 2018 int unc_path_len; 2019 __le16 *unc_path = NULL; 2020 int flags = 0; 2021 unsigned int total_len; 2022 struct TCP_Server_Info *server = cifs_pick_channel(ses); 2023 2024 cifs_dbg(FYI, "TCON\n"); 2025 2026 if (!server || !tree) 2027 return -EIO; 2028 2029 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL); 2030 if (unc_path == NULL) 2031 return -ENOMEM; 2032 2033 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp); 2034 if (unc_path_len <= 0) { 2035 kfree(unc_path); 2036 return -EINVAL; 2037 } 2038 unc_path_len *= 2; 2039 2040 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */ 2041 tcon->tid = 0; 2042 atomic_set(&tcon->num_remote_opens, 0); 2043 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server, 2044 (void **) &req, &total_len); 2045 if (rc) { 2046 kfree(unc_path); 2047 return rc; 2048 } 2049 2050 if (smb3_encryption_required(tcon)) 2051 flags |= CIFS_TRANSFORM_REQ; 2052 2053 iov[0].iov_base = (char *)req; 2054 /* 1 for pad */ 2055 iov[0].iov_len = total_len - 1; 2056 2057 /* Testing shows that buffer offset must be at location of Buffer[0] */ 2058 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)); 2059 req->PathLength = cpu_to_le16(unc_path_len); 2060 iov[1].iov_base = unc_path; 2061 iov[1].iov_len = unc_path_len; 2062 2063 /* 2064 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 2065 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1 2066 * (Samba servers don't always set the flag so also check if null user) 2067 */ 2068 if ((server->dialect == SMB311_PROT_ID) && 2069 !smb3_encryption_required(tcon) && 2070 !(ses->session_flags & 2071 (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) && 2072 ((ses->user_name != NULL) || (ses->sectype == Kerberos))) 2073 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 2074 2075 memset(&rqst, 0, sizeof(struct smb_rqst)); 2076 rqst.rq_iov = iov; 2077 rqst.rq_nvec = 2; 2078 2079 /* Need 64 for max size write so ask for more in case not there yet */ 2080 if (server->credits >= server->max_credits) 2081 req->hdr.CreditRequest = cpu_to_le16(0); 2082 else 2083 req->hdr.CreditRequest = cpu_to_le16( 2084 min_t(int, server->max_credits - 2085 server->credits, 64)); 2086 2087 rc = cifs_send_recv(xid, ses, server, 2088 &rqst, &resp_buftype, flags, &rsp_iov); 2089 cifs_small_buf_release(req); 2090 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base; 2091 trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc); 2092 if ((rc != 0) || (rsp == NULL)) { 2093 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE); 2094 tcon->need_reconnect = true; 2095 goto tcon_error_exit; 2096 } 2097 2098 switch (rsp->ShareType) { 2099 case SMB2_SHARE_TYPE_DISK: 2100 cifs_dbg(FYI, "connection to disk share\n"); 2101 break; 2102 case SMB2_SHARE_TYPE_PIPE: 2103 tcon->pipe = true; 2104 cifs_dbg(FYI, "connection to pipe share\n"); 2105 break; 2106 case SMB2_SHARE_TYPE_PRINT: 2107 tcon->print = true; 2108 cifs_dbg(FYI, "connection to printer\n"); 2109 break; 2110 default: 2111 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType); 2112 rc = -EOPNOTSUPP; 2113 goto tcon_error_exit; 2114 } 2115 2116 tcon->share_flags = le32_to_cpu(rsp->ShareFlags); 2117 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */ 2118 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess); 2119 tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId); 2120 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name)); 2121 2122 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) && 2123 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0)) 2124 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n"); 2125 2126 if (tcon->seal && 2127 !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 2128 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n"); 2129 2130 init_copy_chunk_defaults(tcon); 2131 if (server->ops->validate_negotiate) 2132 rc = server->ops->validate_negotiate(xid, tcon); 2133 if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */ 2134 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT) 2135 server->nosharesock = true; 2136 tcon_exit: 2137 2138 free_rsp_buf(resp_buftype, rsp); 2139 kfree(unc_path); 2140 return rc; 2141 2142 tcon_error_exit: 2143 if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) 2144 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree); 2145 goto tcon_exit; 2146 } 2147 2148 int 2149 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon) 2150 { 2151 struct smb_rqst rqst; 2152 struct smb2_tree_disconnect_req *req; /* response is trivial */ 2153 int rc = 0; 2154 struct cifs_ses *ses = tcon->ses; 2155 struct TCP_Server_Info *server = cifs_pick_channel(ses); 2156 int flags = 0; 2157 unsigned int total_len; 2158 struct kvec iov[1]; 2159 struct kvec rsp_iov; 2160 int resp_buf_type; 2161 2162 cifs_dbg(FYI, "Tree Disconnect\n"); 2163 2164 if (!ses || !(ses->server)) 2165 return -EIO; 2166 2167 trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name); 2168 spin_lock(&ses->chan_lock); 2169 if ((tcon->need_reconnect) || 2170 (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) { 2171 spin_unlock(&ses->chan_lock); 2172 return 0; 2173 } 2174 spin_unlock(&ses->chan_lock); 2175 2176 invalidate_all_cached_dirs(tcon); 2177 2178 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server, 2179 (void **) &req, 2180 &total_len); 2181 if (rc) 2182 return rc; 2183 2184 if (smb3_encryption_required(tcon)) 2185 flags |= CIFS_TRANSFORM_REQ; 2186 2187 flags |= CIFS_NO_RSP_BUF; 2188 2189 iov[0].iov_base = (char *)req; 2190 iov[0].iov_len = total_len; 2191 2192 memset(&rqst, 0, sizeof(struct smb_rqst)); 2193 rqst.rq_iov = iov; 2194 rqst.rq_nvec = 1; 2195 2196 rc = cifs_send_recv(xid, ses, server, 2197 &rqst, &resp_buf_type, flags, &rsp_iov); 2198 cifs_small_buf_release(req); 2199 if (rc) { 2200 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE); 2201 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc); 2202 } 2203 trace_smb3_tdis_done(xid, tcon->tid, ses->Suid); 2204 2205 return rc; 2206 } 2207 2208 2209 static struct create_durable * 2210 create_durable_buf(void) 2211 { 2212 struct create_durable *buf; 2213 2214 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL); 2215 if (!buf) 2216 return NULL; 2217 2218 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2219 (struct create_durable, Data)); 2220 buf->ccontext.DataLength = cpu_to_le32(16); 2221 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2222 (struct create_durable, Name)); 2223 buf->ccontext.NameLength = cpu_to_le16(4); 2224 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */ 2225 buf->Name[0] = 'D'; 2226 buf->Name[1] = 'H'; 2227 buf->Name[2] = 'n'; 2228 buf->Name[3] = 'Q'; 2229 return buf; 2230 } 2231 2232 static struct create_durable * 2233 create_reconnect_durable_buf(struct cifs_fid *fid) 2234 { 2235 struct create_durable *buf; 2236 2237 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL); 2238 if (!buf) 2239 return NULL; 2240 2241 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2242 (struct create_durable, Data)); 2243 buf->ccontext.DataLength = cpu_to_le32(16); 2244 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2245 (struct create_durable, Name)); 2246 buf->ccontext.NameLength = cpu_to_le16(4); 2247 buf->Data.Fid.PersistentFileId = fid->persistent_fid; 2248 buf->Data.Fid.VolatileFileId = fid->volatile_fid; 2249 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */ 2250 buf->Name[0] = 'D'; 2251 buf->Name[1] = 'H'; 2252 buf->Name[2] = 'n'; 2253 buf->Name[3] = 'C'; 2254 return buf; 2255 } 2256 2257 static void 2258 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf) 2259 { 2260 struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc; 2261 2262 cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n", 2263 pdisk_id->DiskFileId, pdisk_id->VolumeId); 2264 buf->IndexNumber = pdisk_id->DiskFileId; 2265 } 2266 2267 static void 2268 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info, 2269 struct create_posix_rsp *posix) 2270 { 2271 int sid_len; 2272 u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset); 2273 u8 *end = beg + le32_to_cpu(cc->DataLength); 2274 u8 *sid; 2275 2276 memset(posix, 0, sizeof(*posix)); 2277 2278 posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0)); 2279 posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4)); 2280 posix->mode = le32_to_cpu(*(__le32 *)(beg + 8)); 2281 2282 sid = beg + 12; 2283 sid_len = posix_info_sid_size(sid, end); 2284 if (sid_len < 0) { 2285 cifs_dbg(VFS, "bad owner sid in posix create response\n"); 2286 return; 2287 } 2288 memcpy(&posix->owner, sid, sid_len); 2289 2290 sid = sid + sid_len; 2291 sid_len = posix_info_sid_size(sid, end); 2292 if (sid_len < 0) { 2293 cifs_dbg(VFS, "bad group sid in posix create response\n"); 2294 return; 2295 } 2296 memcpy(&posix->group, sid, sid_len); 2297 2298 cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n", 2299 posix->nlink, posix->mode, posix->reparse_tag); 2300 } 2301 2302 int smb2_parse_contexts(struct TCP_Server_Info *server, 2303 struct kvec *rsp_iov, 2304 unsigned int *epoch, 2305 char *lease_key, __u8 *oplock, 2306 struct smb2_file_all_info *buf, 2307 struct create_posix_rsp *posix) 2308 { 2309 struct smb2_create_rsp *rsp = rsp_iov->iov_base; 2310 struct create_context *cc; 2311 size_t rem, off, len; 2312 size_t doff, dlen; 2313 size_t noff, nlen; 2314 char *name; 2315 static const char smb3_create_tag_posix[] = { 2316 0x93, 0xAD, 0x25, 0x50, 0x9C, 2317 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83, 2318 0xDE, 0x96, 0x8B, 0xCD, 0x7C 2319 }; 2320 2321 *oplock = 0; 2322 2323 off = le32_to_cpu(rsp->CreateContextsOffset); 2324 rem = le32_to_cpu(rsp->CreateContextsLength); 2325 if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len) 2326 return -EINVAL; 2327 cc = (struct create_context *)((u8 *)rsp + off); 2328 2329 /* Initialize inode number to 0 in case no valid data in qfid context */ 2330 if (buf) 2331 buf->IndexNumber = 0; 2332 2333 while (rem >= sizeof(*cc)) { 2334 doff = le16_to_cpu(cc->DataOffset); 2335 dlen = le32_to_cpu(cc->DataLength); 2336 if (check_add_overflow(doff, dlen, &len) || len > rem) 2337 return -EINVAL; 2338 2339 noff = le16_to_cpu(cc->NameOffset); 2340 nlen = le16_to_cpu(cc->NameLength); 2341 if (noff + nlen > doff) 2342 return -EINVAL; 2343 2344 name = (char *)cc + noff; 2345 switch (nlen) { 2346 case 4: 2347 if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) { 2348 *oplock = server->ops->parse_lease_buf(cc, epoch, 2349 lease_key); 2350 } else if (buf && 2351 !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) { 2352 parse_query_id_ctxt(cc, buf); 2353 } 2354 break; 2355 case 16: 2356 if (posix && !memcmp(name, smb3_create_tag_posix, 16)) 2357 parse_posix_ctxt(cc, buf, posix); 2358 break; 2359 default: 2360 cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n", 2361 __func__, nlen, dlen); 2362 if (IS_ENABLED(CONFIG_CIFS_DEBUG2)) 2363 cifs_dump_mem("context data: ", cc, dlen); 2364 break; 2365 } 2366 2367 off = le32_to_cpu(cc->Next); 2368 if (!off) 2369 break; 2370 if (check_sub_overflow(rem, off, &rem)) 2371 return -EINVAL; 2372 cc = (struct create_context *)((u8 *)cc + off); 2373 } 2374 2375 if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE) 2376 *oplock = rsp->OplockLevel; 2377 2378 return 0; 2379 } 2380 2381 static int 2382 add_lease_context(struct TCP_Server_Info *server, 2383 struct smb2_create_req *req, 2384 struct kvec *iov, 2385 unsigned int *num_iovec, u8 *lease_key, __u8 *oplock) 2386 { 2387 unsigned int num = *num_iovec; 2388 2389 iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock); 2390 if (iov[num].iov_base == NULL) 2391 return -ENOMEM; 2392 iov[num].iov_len = server->vals->create_lease_size; 2393 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE; 2394 *num_iovec = num + 1; 2395 return 0; 2396 } 2397 2398 static struct create_durable_v2 * 2399 create_durable_v2_buf(struct cifs_open_parms *oparms) 2400 { 2401 struct cifs_fid *pfid = oparms->fid; 2402 struct create_durable_v2 *buf; 2403 2404 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL); 2405 if (!buf) 2406 return NULL; 2407 2408 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2409 (struct create_durable_v2, dcontext)); 2410 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2)); 2411 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2412 (struct create_durable_v2, Name)); 2413 buf->ccontext.NameLength = cpu_to_le16(4); 2414 2415 /* 2416 * NB: Handle timeout defaults to 0, which allows server to choose 2417 * (most servers default to 120 seconds) and most clients default to 0. 2418 * This can be overridden at mount ("handletimeout=") if the user wants 2419 * a different persistent (or resilient) handle timeout for all opens 2420 * on a particular SMB3 mount. 2421 */ 2422 buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout); 2423 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); 2424 generate_random_uuid(buf->dcontext.CreateGuid); 2425 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16); 2426 2427 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */ 2428 buf->Name[0] = 'D'; 2429 buf->Name[1] = 'H'; 2430 buf->Name[2] = '2'; 2431 buf->Name[3] = 'Q'; 2432 return buf; 2433 } 2434 2435 static struct create_durable_handle_reconnect_v2 * 2436 create_reconnect_durable_v2_buf(struct cifs_fid *fid) 2437 { 2438 struct create_durable_handle_reconnect_v2 *buf; 2439 2440 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2), 2441 GFP_KERNEL); 2442 if (!buf) 2443 return NULL; 2444 2445 buf->ccontext.DataOffset = 2446 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, 2447 dcontext)); 2448 buf->ccontext.DataLength = 2449 cpu_to_le32(sizeof(struct durable_reconnect_context_v2)); 2450 buf->ccontext.NameOffset = 2451 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, 2452 Name)); 2453 buf->ccontext.NameLength = cpu_to_le16(4); 2454 2455 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid; 2456 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid; 2457 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); 2458 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16); 2459 2460 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */ 2461 buf->Name[0] = 'D'; 2462 buf->Name[1] = 'H'; 2463 buf->Name[2] = '2'; 2464 buf->Name[3] = 'C'; 2465 return buf; 2466 } 2467 2468 static int 2469 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec, 2470 struct cifs_open_parms *oparms) 2471 { 2472 unsigned int num = *num_iovec; 2473 2474 iov[num].iov_base = create_durable_v2_buf(oparms); 2475 if (iov[num].iov_base == NULL) 2476 return -ENOMEM; 2477 iov[num].iov_len = sizeof(struct create_durable_v2); 2478 *num_iovec = num + 1; 2479 return 0; 2480 } 2481 2482 static int 2483 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec, 2484 struct cifs_open_parms *oparms) 2485 { 2486 unsigned int num = *num_iovec; 2487 2488 /* indicate that we don't need to relock the file */ 2489 oparms->reconnect = false; 2490 2491 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid); 2492 if (iov[num].iov_base == NULL) 2493 return -ENOMEM; 2494 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2); 2495 *num_iovec = num + 1; 2496 return 0; 2497 } 2498 2499 static int 2500 add_durable_context(struct kvec *iov, unsigned int *num_iovec, 2501 struct cifs_open_parms *oparms, bool use_persistent) 2502 { 2503 unsigned int num = *num_iovec; 2504 2505 if (use_persistent) { 2506 if (oparms->reconnect) 2507 return add_durable_reconnect_v2_context(iov, num_iovec, 2508 oparms); 2509 else 2510 return add_durable_v2_context(iov, num_iovec, oparms); 2511 } 2512 2513 if (oparms->reconnect) { 2514 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid); 2515 /* indicate that we don't need to relock the file */ 2516 oparms->reconnect = false; 2517 } else 2518 iov[num].iov_base = create_durable_buf(); 2519 if (iov[num].iov_base == NULL) 2520 return -ENOMEM; 2521 iov[num].iov_len = sizeof(struct create_durable); 2522 *num_iovec = num + 1; 2523 return 0; 2524 } 2525 2526 /* See MS-SMB2 2.2.13.2.7 */ 2527 static struct crt_twarp_ctxt * 2528 create_twarp_buf(__u64 timewarp) 2529 { 2530 struct crt_twarp_ctxt *buf; 2531 2532 buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL); 2533 if (!buf) 2534 return NULL; 2535 2536 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2537 (struct crt_twarp_ctxt, Timestamp)); 2538 buf->ccontext.DataLength = cpu_to_le32(8); 2539 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2540 (struct crt_twarp_ctxt, Name)); 2541 buf->ccontext.NameLength = cpu_to_le16(4); 2542 /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */ 2543 buf->Name[0] = 'T'; 2544 buf->Name[1] = 'W'; 2545 buf->Name[2] = 'r'; 2546 buf->Name[3] = 'p'; 2547 buf->Timestamp = cpu_to_le64(timewarp); 2548 return buf; 2549 } 2550 2551 /* See MS-SMB2 2.2.13.2.7 */ 2552 static int 2553 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp) 2554 { 2555 unsigned int num = *num_iovec; 2556 2557 iov[num].iov_base = create_twarp_buf(timewarp); 2558 if (iov[num].iov_base == NULL) 2559 return -ENOMEM; 2560 iov[num].iov_len = sizeof(struct crt_twarp_ctxt); 2561 *num_iovec = num + 1; 2562 return 0; 2563 } 2564 2565 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */ 2566 static void setup_owner_group_sids(char *buf) 2567 { 2568 struct owner_group_sids *sids = (struct owner_group_sids *)buf; 2569 2570 /* Populate the user ownership fields S-1-5-88-1 */ 2571 sids->owner.Revision = 1; 2572 sids->owner.NumAuth = 3; 2573 sids->owner.Authority[5] = 5; 2574 sids->owner.SubAuthorities[0] = cpu_to_le32(88); 2575 sids->owner.SubAuthorities[1] = cpu_to_le32(1); 2576 sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val); 2577 2578 /* Populate the group ownership fields S-1-5-88-2 */ 2579 sids->group.Revision = 1; 2580 sids->group.NumAuth = 3; 2581 sids->group.Authority[5] = 5; 2582 sids->group.SubAuthorities[0] = cpu_to_le32(88); 2583 sids->group.SubAuthorities[1] = cpu_to_le32(2); 2584 sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val); 2585 2586 cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val); 2587 } 2588 2589 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */ 2590 static struct crt_sd_ctxt * 2591 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len) 2592 { 2593 struct crt_sd_ctxt *buf; 2594 __u8 *ptr, *aclptr; 2595 unsigned int acelen, acl_size, ace_count; 2596 unsigned int owner_offset = 0; 2597 unsigned int group_offset = 0; 2598 struct smb3_acl acl = {}; 2599 2600 *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8); 2601 2602 if (set_owner) { 2603 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */ 2604 *len += sizeof(struct owner_group_sids); 2605 } 2606 2607 buf = kzalloc(*len, GFP_KERNEL); 2608 if (buf == NULL) 2609 return buf; 2610 2611 ptr = (__u8 *)&buf[1]; 2612 if (set_owner) { 2613 /* offset fields are from beginning of security descriptor not of create context */ 2614 owner_offset = ptr - (__u8 *)&buf->sd; 2615 buf->sd.OffsetOwner = cpu_to_le32(owner_offset); 2616 group_offset = owner_offset + offsetof(struct owner_group_sids, group); 2617 buf->sd.OffsetGroup = cpu_to_le32(group_offset); 2618 2619 setup_owner_group_sids(ptr); 2620 ptr += sizeof(struct owner_group_sids); 2621 } else { 2622 buf->sd.OffsetOwner = 0; 2623 buf->sd.OffsetGroup = 0; 2624 } 2625 2626 buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd)); 2627 buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name)); 2628 buf->ccontext.NameLength = cpu_to_le16(4); 2629 /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */ 2630 buf->Name[0] = 'S'; 2631 buf->Name[1] = 'e'; 2632 buf->Name[2] = 'c'; 2633 buf->Name[3] = 'D'; 2634 buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */ 2635 2636 /* 2637 * ACL is "self relative" ie ACL is stored in contiguous block of memory 2638 * and "DP" ie the DACL is present 2639 */ 2640 buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP); 2641 2642 /* offset owner, group and Sbz1 and SACL are all zero */ 2643 buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd); 2644 /* Ship the ACL for now. we will copy it into buf later. */ 2645 aclptr = ptr; 2646 ptr += sizeof(struct smb3_acl); 2647 2648 /* create one ACE to hold the mode embedded in reserved special SID */ 2649 acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode); 2650 ptr += acelen; 2651 acl_size = acelen + sizeof(struct smb3_acl); 2652 ace_count = 1; 2653 2654 if (set_owner) { 2655 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */ 2656 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr); 2657 ptr += acelen; 2658 acl_size += acelen; 2659 ace_count += 1; 2660 } 2661 2662 /* and one more ACE to allow access for authenticated users */ 2663 acelen = setup_authusers_ACE((struct cifs_ace *)ptr); 2664 ptr += acelen; 2665 acl_size += acelen; 2666 ace_count += 1; 2667 2668 acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */ 2669 acl.AclSize = cpu_to_le16(acl_size); 2670 acl.AceCount = cpu_to_le16(ace_count); 2671 /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */ 2672 memcpy(aclptr, &acl, sizeof(struct smb3_acl)); 2673 2674 buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd); 2675 *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8); 2676 2677 return buf; 2678 } 2679 2680 static int 2681 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner) 2682 { 2683 unsigned int num = *num_iovec; 2684 unsigned int len = 0; 2685 2686 iov[num].iov_base = create_sd_buf(mode, set_owner, &len); 2687 if (iov[num].iov_base == NULL) 2688 return -ENOMEM; 2689 iov[num].iov_len = len; 2690 *num_iovec = num + 1; 2691 return 0; 2692 } 2693 2694 static struct crt_query_id_ctxt * 2695 create_query_id_buf(void) 2696 { 2697 struct crt_query_id_ctxt *buf; 2698 2699 buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL); 2700 if (!buf) 2701 return NULL; 2702 2703 buf->ccontext.DataOffset = cpu_to_le16(0); 2704 buf->ccontext.DataLength = cpu_to_le32(0); 2705 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2706 (struct crt_query_id_ctxt, Name)); 2707 buf->ccontext.NameLength = cpu_to_le16(4); 2708 /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */ 2709 buf->Name[0] = 'Q'; 2710 buf->Name[1] = 'F'; 2711 buf->Name[2] = 'i'; 2712 buf->Name[3] = 'd'; 2713 return buf; 2714 } 2715 2716 /* See MS-SMB2 2.2.13.2.9 */ 2717 static int 2718 add_query_id_context(struct kvec *iov, unsigned int *num_iovec) 2719 { 2720 unsigned int num = *num_iovec; 2721 2722 iov[num].iov_base = create_query_id_buf(); 2723 if (iov[num].iov_base == NULL) 2724 return -ENOMEM; 2725 iov[num].iov_len = sizeof(struct crt_query_id_ctxt); 2726 *num_iovec = num + 1; 2727 return 0; 2728 } 2729 2730 static int 2731 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len, 2732 const char *treename, const __le16 *path) 2733 { 2734 int treename_len, path_len; 2735 struct nls_table *cp; 2736 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)}; 2737 2738 /* 2739 * skip leading "\\" 2740 */ 2741 treename_len = strlen(treename); 2742 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\')) 2743 return -EINVAL; 2744 2745 treename += 2; 2746 treename_len -= 2; 2747 2748 path_len = UniStrnlen((wchar_t *)path, PATH_MAX); 2749 2750 /* make room for one path separator only if @path isn't empty */ 2751 *out_len = treename_len + (path[0] ? 1 : 0) + path_len; 2752 2753 /* 2754 * final path needs to be 8-byte aligned as specified in 2755 * MS-SMB2 2.2.13 SMB2 CREATE Request. 2756 */ 2757 *out_size = round_up(*out_len * sizeof(__le16), 8); 2758 *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL); 2759 if (!*out_path) 2760 return -ENOMEM; 2761 2762 cp = load_nls_default(); 2763 cifs_strtoUTF16(*out_path, treename, treename_len, cp); 2764 2765 /* Do not append the separator if the path is empty */ 2766 if (path[0] != cpu_to_le16(0x0000)) { 2767 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep); 2768 UniStrcat((wchar_t *)*out_path, (wchar_t *)path); 2769 } 2770 2771 unload_nls(cp); 2772 2773 return 0; 2774 } 2775 2776 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode, 2777 umode_t mode, struct cifs_tcon *tcon, 2778 const char *full_path, 2779 struct cifs_sb_info *cifs_sb) 2780 { 2781 struct smb_rqst rqst; 2782 struct smb2_create_req *req; 2783 struct smb2_create_rsp *rsp = NULL; 2784 struct cifs_ses *ses = tcon->ses; 2785 struct kvec iov[3]; /* make sure at least one for each open context */ 2786 struct kvec rsp_iov = {NULL, 0}; 2787 int resp_buftype; 2788 int uni_path_len; 2789 __le16 *copy_path = NULL; 2790 int copy_size; 2791 int rc = 0; 2792 unsigned int n_iov = 2; 2793 __u32 file_attributes = 0; 2794 char *pc_buf = NULL; 2795 int flags = 0; 2796 unsigned int total_len; 2797 __le16 *utf16_path = NULL; 2798 struct TCP_Server_Info *server = cifs_pick_channel(ses); 2799 2800 cifs_dbg(FYI, "mkdir\n"); 2801 2802 /* resource #1: path allocation */ 2803 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb); 2804 if (!utf16_path) 2805 return -ENOMEM; 2806 2807 if (!ses || !server) { 2808 rc = -EIO; 2809 goto err_free_path; 2810 } 2811 2812 /* resource #2: request */ 2813 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server, 2814 (void **) &req, &total_len); 2815 if (rc) 2816 goto err_free_path; 2817 2818 2819 if (smb3_encryption_required(tcon)) 2820 flags |= CIFS_TRANSFORM_REQ; 2821 2822 req->ImpersonationLevel = IL_IMPERSONATION; 2823 req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES); 2824 /* File attributes ignored on open (used in create though) */ 2825 req->FileAttributes = cpu_to_le32(file_attributes); 2826 req->ShareAccess = FILE_SHARE_ALL_LE; 2827 req->CreateDisposition = cpu_to_le32(FILE_CREATE); 2828 req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE); 2829 2830 iov[0].iov_base = (char *)req; 2831 /* -1 since last byte is buf[0] which is sent below (path) */ 2832 iov[0].iov_len = total_len - 1; 2833 2834 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); 2835 2836 /* [MS-SMB2] 2.2.13 NameOffset: 2837 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of 2838 * the SMB2 header, the file name includes a prefix that will 2839 * be processed during DFS name normalization as specified in 2840 * section 3.3.5.9. Otherwise, the file name is relative to 2841 * the share that is identified by the TreeId in the SMB2 2842 * header. 2843 */ 2844 if (tcon->share_flags & SHI1005_FLAGS_DFS) { 2845 int name_len; 2846 2847 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; 2848 rc = alloc_path_with_tree_prefix(©_path, ©_size, 2849 &name_len, 2850 tcon->tree_name, utf16_path); 2851 if (rc) 2852 goto err_free_req; 2853 2854 req->NameLength = cpu_to_le16(name_len * 2); 2855 uni_path_len = copy_size; 2856 /* free before overwriting resource */ 2857 kfree(utf16_path); 2858 utf16_path = copy_path; 2859 } else { 2860 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2; 2861 /* MUST set path len (NameLength) to 0 opening root of share */ 2862 req->NameLength = cpu_to_le16(uni_path_len - 2); 2863 if (uni_path_len % 8 != 0) { 2864 copy_size = roundup(uni_path_len, 8); 2865 copy_path = kzalloc(copy_size, GFP_KERNEL); 2866 if (!copy_path) { 2867 rc = -ENOMEM; 2868 goto err_free_req; 2869 } 2870 memcpy((char *)copy_path, (const char *)utf16_path, 2871 uni_path_len); 2872 uni_path_len = copy_size; 2873 /* free before overwriting resource */ 2874 kfree(utf16_path); 2875 utf16_path = copy_path; 2876 } 2877 } 2878 2879 iov[1].iov_len = uni_path_len; 2880 iov[1].iov_base = utf16_path; 2881 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE; 2882 2883 if (tcon->posix_extensions) { 2884 /* resource #3: posix buf */ 2885 rc = add_posix_context(iov, &n_iov, mode); 2886 if (rc) 2887 goto err_free_req; 2888 req->CreateContextsOffset = cpu_to_le32( 2889 sizeof(struct smb2_create_req) + 2890 iov[1].iov_len); 2891 pc_buf = iov[n_iov-1].iov_base; 2892 } 2893 2894 2895 memset(&rqst, 0, sizeof(struct smb_rqst)); 2896 rqst.rq_iov = iov; 2897 rqst.rq_nvec = n_iov; 2898 2899 /* no need to inc num_remote_opens because we close it just below */ 2900 trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE, 2901 FILE_WRITE_ATTRIBUTES); 2902 /* resource #4: response buffer */ 2903 rc = cifs_send_recv(xid, ses, server, 2904 &rqst, &resp_buftype, flags, &rsp_iov); 2905 if (rc) { 2906 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); 2907 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid, 2908 CREATE_NOT_FILE, 2909 FILE_WRITE_ATTRIBUTES, rc); 2910 goto err_free_rsp_buf; 2911 } 2912 2913 /* 2914 * Although unlikely to be possible for rsp to be null and rc not set, 2915 * adding check below is slightly safer long term (and quiets Coverity 2916 * warning) 2917 */ 2918 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; 2919 if (rsp == NULL) { 2920 rc = -EIO; 2921 kfree(pc_buf); 2922 goto err_free_req; 2923 } 2924 2925 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid, 2926 CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES); 2927 2928 SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId); 2929 2930 /* Eventually save off posix specific response info and timestaps */ 2931 2932 err_free_rsp_buf: 2933 free_rsp_buf(resp_buftype, rsp); 2934 kfree(pc_buf); 2935 err_free_req: 2936 cifs_small_buf_release(req); 2937 err_free_path: 2938 kfree(utf16_path); 2939 return rc; 2940 } 2941 2942 int 2943 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 2944 struct smb_rqst *rqst, __u8 *oplock, 2945 struct cifs_open_parms *oparms, __le16 *path) 2946 { 2947 struct smb2_create_req *req; 2948 unsigned int n_iov = 2; 2949 __u32 file_attributes = 0; 2950 int copy_size; 2951 int uni_path_len; 2952 unsigned int total_len; 2953 struct kvec *iov = rqst->rq_iov; 2954 __le16 *copy_path; 2955 int rc; 2956 2957 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server, 2958 (void **) &req, &total_len); 2959 if (rc) 2960 return rc; 2961 2962 iov[0].iov_base = (char *)req; 2963 /* -1 since last byte is buf[0] which is sent below (path) */ 2964 iov[0].iov_len = total_len - 1; 2965 2966 if (oparms->create_options & CREATE_OPTION_READONLY) 2967 file_attributes |= ATTR_READONLY; 2968 if (oparms->create_options & CREATE_OPTION_SPECIAL) 2969 file_attributes |= ATTR_SYSTEM; 2970 2971 req->ImpersonationLevel = IL_IMPERSONATION; 2972 req->DesiredAccess = cpu_to_le32(oparms->desired_access); 2973 /* File attributes ignored on open (used in create though) */ 2974 req->FileAttributes = cpu_to_le32(file_attributes); 2975 req->ShareAccess = FILE_SHARE_ALL_LE; 2976 2977 req->CreateDisposition = cpu_to_le32(oparms->disposition); 2978 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK); 2979 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); 2980 2981 /* [MS-SMB2] 2.2.13 NameOffset: 2982 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of 2983 * the SMB2 header, the file name includes a prefix that will 2984 * be processed during DFS name normalization as specified in 2985 * section 3.3.5.9. Otherwise, the file name is relative to 2986 * the share that is identified by the TreeId in the SMB2 2987 * header. 2988 */ 2989 if (tcon->share_flags & SHI1005_FLAGS_DFS) { 2990 int name_len; 2991 2992 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; 2993 rc = alloc_path_with_tree_prefix(©_path, ©_size, 2994 &name_len, 2995 tcon->tree_name, path); 2996 if (rc) 2997 return rc; 2998 req->NameLength = cpu_to_le16(name_len * 2); 2999 uni_path_len = copy_size; 3000 path = copy_path; 3001 } else { 3002 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2; 3003 /* MUST set path len (NameLength) to 0 opening root of share */ 3004 req->NameLength = cpu_to_le16(uni_path_len - 2); 3005 copy_size = round_up(uni_path_len, 8); 3006 copy_path = kzalloc(copy_size, GFP_KERNEL); 3007 if (!copy_path) 3008 return -ENOMEM; 3009 memcpy((char *)copy_path, (const char *)path, 3010 uni_path_len); 3011 uni_path_len = copy_size; 3012 path = copy_path; 3013 } 3014 3015 iov[1].iov_len = uni_path_len; 3016 iov[1].iov_base = path; 3017 3018 if ((!server->oplocks) || (tcon->no_lease)) 3019 *oplock = SMB2_OPLOCK_LEVEL_NONE; 3020 3021 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) || 3022 *oplock == SMB2_OPLOCK_LEVEL_NONE) 3023 req->RequestedOplockLevel = *oplock; 3024 else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) && 3025 (oparms->create_options & CREATE_NOT_FILE)) 3026 req->RequestedOplockLevel = *oplock; /* no srv lease support */ 3027 else { 3028 rc = add_lease_context(server, req, iov, &n_iov, 3029 oparms->fid->lease_key, oplock); 3030 if (rc) 3031 return rc; 3032 } 3033 3034 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) { 3035 rc = add_durable_context(iov, &n_iov, oparms, 3036 tcon->use_persistent); 3037 if (rc) 3038 return rc; 3039 } 3040 3041 if (tcon->posix_extensions) { 3042 rc = add_posix_context(iov, &n_iov, oparms->mode); 3043 if (rc) 3044 return rc; 3045 } 3046 3047 if (tcon->snapshot_time) { 3048 cifs_dbg(FYI, "adding snapshot context\n"); 3049 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time); 3050 if (rc) 3051 return rc; 3052 } 3053 3054 if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) { 3055 bool set_mode; 3056 bool set_owner; 3057 3058 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) && 3059 (oparms->mode != ACL_NO_MODE)) 3060 set_mode = true; 3061 else { 3062 set_mode = false; 3063 oparms->mode = ACL_NO_MODE; 3064 } 3065 3066 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL) 3067 set_owner = true; 3068 else 3069 set_owner = false; 3070 3071 if (set_owner | set_mode) { 3072 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode); 3073 rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner); 3074 if (rc) 3075 return rc; 3076 } 3077 } 3078 3079 add_query_id_context(iov, &n_iov); 3080 3081 if (n_iov > 2) { 3082 /* 3083 * We have create contexts behind iov[1] (the file 3084 * name), point at them from the main create request 3085 */ 3086 req->CreateContextsOffset = cpu_to_le32( 3087 sizeof(struct smb2_create_req) + 3088 iov[1].iov_len); 3089 req->CreateContextsLength = 0; 3090 3091 for (unsigned int i = 2; i < (n_iov-1); i++) { 3092 struct kvec *v = &iov[i]; 3093 size_t len = v->iov_len; 3094 struct create_context *cctx = 3095 (struct create_context *)v->iov_base; 3096 3097 cctx->Next = cpu_to_le32(len); 3098 le32_add_cpu(&req->CreateContextsLength, len); 3099 } 3100 le32_add_cpu(&req->CreateContextsLength, 3101 iov[n_iov-1].iov_len); 3102 } 3103 3104 rqst->rq_nvec = n_iov; 3105 return 0; 3106 } 3107 3108 /* rq_iov[0] is the request and is released by cifs_small_buf_release(). 3109 * All other vectors are freed by kfree(). 3110 */ 3111 void 3112 SMB2_open_free(struct smb_rqst *rqst) 3113 { 3114 int i; 3115 3116 if (rqst && rqst->rq_iov) { 3117 cifs_small_buf_release(rqst->rq_iov[0].iov_base); 3118 for (i = 1; i < rqst->rq_nvec; i++) 3119 if (rqst->rq_iov[i].iov_base != smb2_padding) 3120 kfree(rqst->rq_iov[i].iov_base); 3121 } 3122 } 3123 3124 int 3125 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path, 3126 __u8 *oplock, struct smb2_file_all_info *buf, 3127 struct create_posix_rsp *posix, 3128 struct kvec *err_iov, int *buftype) 3129 { 3130 struct smb_rqst rqst; 3131 struct smb2_create_rsp *rsp = NULL; 3132 struct cifs_tcon *tcon = oparms->tcon; 3133 struct cifs_ses *ses = tcon->ses; 3134 struct TCP_Server_Info *server = cifs_pick_channel(ses); 3135 struct kvec iov[SMB2_CREATE_IOV_SIZE]; 3136 struct kvec rsp_iov = {NULL, 0}; 3137 int resp_buftype = CIFS_NO_BUFFER; 3138 int rc = 0; 3139 int flags = 0; 3140 3141 cifs_dbg(FYI, "create/open\n"); 3142 if (!ses || !server) 3143 return -EIO; 3144 3145 if (smb3_encryption_required(tcon)) 3146 flags |= CIFS_TRANSFORM_REQ; 3147 3148 memset(&rqst, 0, sizeof(struct smb_rqst)); 3149 memset(&iov, 0, sizeof(iov)); 3150 rqst.rq_iov = iov; 3151 rqst.rq_nvec = SMB2_CREATE_IOV_SIZE; 3152 3153 rc = SMB2_open_init(tcon, server, 3154 &rqst, oplock, oparms, path); 3155 if (rc) 3156 goto creat_exit; 3157 3158 trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path, 3159 oparms->create_options, oparms->desired_access); 3160 3161 rc = cifs_send_recv(xid, ses, server, 3162 &rqst, &resp_buftype, flags, 3163 &rsp_iov); 3164 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; 3165 3166 if (rc != 0) { 3167 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); 3168 if (err_iov && rsp) { 3169 *err_iov = rsp_iov; 3170 *buftype = resp_buftype; 3171 resp_buftype = CIFS_NO_BUFFER; 3172 rsp = NULL; 3173 } 3174 trace_smb3_open_err(xid, tcon->tid, ses->Suid, 3175 oparms->create_options, oparms->desired_access, rc); 3176 if (rc == -EREMCHG) { 3177 pr_warn_once("server share %s deleted\n", 3178 tcon->tree_name); 3179 tcon->need_reconnect = true; 3180 } 3181 goto creat_exit; 3182 } else if (rsp == NULL) /* unlikely to happen, but safer to check */ 3183 goto creat_exit; 3184 else 3185 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid, 3186 oparms->create_options, oparms->desired_access); 3187 3188 atomic_inc(&tcon->num_remote_opens); 3189 oparms->fid->persistent_fid = rsp->PersistentFileId; 3190 oparms->fid->volatile_fid = rsp->VolatileFileId; 3191 oparms->fid->access = oparms->desired_access; 3192 #ifdef CONFIG_CIFS_DEBUG2 3193 oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId); 3194 #endif /* CIFS_DEBUG2 */ 3195 3196 if (buf) { 3197 buf->CreationTime = rsp->CreationTime; 3198 buf->LastAccessTime = rsp->LastAccessTime; 3199 buf->LastWriteTime = rsp->LastWriteTime; 3200 buf->ChangeTime = rsp->ChangeTime; 3201 buf->AllocationSize = rsp->AllocationSize; 3202 buf->EndOfFile = rsp->EndofFile; 3203 buf->Attributes = rsp->FileAttributes; 3204 buf->NumberOfLinks = cpu_to_le32(1); 3205 buf->DeletePending = 0; 3206 } 3207 3208 3209 rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch, 3210 oparms->fid->lease_key, oplock, buf, posix); 3211 creat_exit: 3212 SMB2_open_free(&rqst); 3213 free_rsp_buf(resp_buftype, rsp); 3214 return rc; 3215 } 3216 3217 int 3218 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3219 struct smb_rqst *rqst, 3220 u64 persistent_fid, u64 volatile_fid, u32 opcode, 3221 char *in_data, u32 indatalen, 3222 __u32 max_response_size) 3223 { 3224 struct smb2_ioctl_req *req; 3225 struct kvec *iov = rqst->rq_iov; 3226 unsigned int total_len; 3227 int rc; 3228 char *in_data_buf; 3229 3230 rc = smb2_ioctl_req_init(opcode, tcon, server, 3231 (void **) &req, &total_len); 3232 if (rc) 3233 return rc; 3234 3235 if (indatalen) { 3236 /* 3237 * indatalen is usually small at a couple of bytes max, so 3238 * just allocate through generic pool 3239 */ 3240 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS); 3241 if (!in_data_buf) { 3242 cifs_small_buf_release(req); 3243 return -ENOMEM; 3244 } 3245 } 3246 3247 req->CtlCode = cpu_to_le32(opcode); 3248 req->PersistentFileId = persistent_fid; 3249 req->VolatileFileId = volatile_fid; 3250 3251 iov[0].iov_base = (char *)req; 3252 /* 3253 * If no input data, the size of ioctl struct in 3254 * protocol spec still includes a 1 byte data buffer, 3255 * but if input data passed to ioctl, we do not 3256 * want to double count this, so we do not send 3257 * the dummy one byte of data in iovec[0] if sending 3258 * input data (in iovec[1]). 3259 */ 3260 if (indatalen) { 3261 req->InputCount = cpu_to_le32(indatalen); 3262 /* do not set InputOffset if no input data */ 3263 req->InputOffset = 3264 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer)); 3265 rqst->rq_nvec = 2; 3266 iov[0].iov_len = total_len - 1; 3267 iov[1].iov_base = in_data_buf; 3268 iov[1].iov_len = indatalen; 3269 } else { 3270 rqst->rq_nvec = 1; 3271 iov[0].iov_len = total_len; 3272 } 3273 3274 req->OutputOffset = 0; 3275 req->OutputCount = 0; /* MBZ */ 3276 3277 /* 3278 * In most cases max_response_size is set to 16K (CIFSMaxBufSize) 3279 * We Could increase default MaxOutputResponse, but that could require 3280 * more credits. Windows typically sets this smaller, but for some 3281 * ioctls it may be useful to allow server to send more. No point 3282 * limiting what the server can send as long as fits in one credit 3283 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want 3284 * to increase this limit up in the future. 3285 * Note that for snapshot queries that servers like Azure expect that 3286 * the first query be minimal size (and just used to get the number/size 3287 * of previous versions) so response size must be specified as EXACTLY 3288 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple 3289 * of eight bytes. Currently that is the only case where we set max 3290 * response size smaller. 3291 */ 3292 req->MaxOutputResponse = cpu_to_le32(max_response_size); 3293 req->hdr.CreditCharge = 3294 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size), 3295 SMB2_MAX_BUFFER_SIZE)); 3296 /* always an FSCTL (for now) */ 3297 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL); 3298 3299 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */ 3300 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) 3301 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 3302 3303 return 0; 3304 } 3305 3306 void 3307 SMB2_ioctl_free(struct smb_rqst *rqst) 3308 { 3309 int i; 3310 3311 if (rqst && rqst->rq_iov) { 3312 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3313 for (i = 1; i < rqst->rq_nvec; i++) 3314 if (rqst->rq_iov[i].iov_base != smb2_padding) 3315 kfree(rqst->rq_iov[i].iov_base); 3316 } 3317 } 3318 3319 3320 /* 3321 * SMB2 IOCTL is used for both IOCTLs and FSCTLs 3322 */ 3323 int 3324 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 3325 u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen, 3326 u32 max_out_data_len, char **out_data, 3327 u32 *plen /* returned data len */) 3328 { 3329 struct smb_rqst rqst; 3330 struct smb2_ioctl_rsp *rsp = NULL; 3331 struct cifs_ses *ses; 3332 struct TCP_Server_Info *server; 3333 struct kvec iov[SMB2_IOCTL_IOV_SIZE]; 3334 struct kvec rsp_iov = {NULL, 0}; 3335 int resp_buftype = CIFS_NO_BUFFER; 3336 int rc = 0; 3337 int flags = 0; 3338 3339 cifs_dbg(FYI, "SMB2 IOCTL\n"); 3340 3341 if (out_data != NULL) 3342 *out_data = NULL; 3343 3344 /* zero out returned data len, in case of error */ 3345 if (plen) 3346 *plen = 0; 3347 3348 if (!tcon) 3349 return -EIO; 3350 3351 ses = tcon->ses; 3352 if (!ses) 3353 return -EIO; 3354 3355 server = cifs_pick_channel(ses); 3356 if (!server) 3357 return -EIO; 3358 3359 if (smb3_encryption_required(tcon)) 3360 flags |= CIFS_TRANSFORM_REQ; 3361 3362 memset(&rqst, 0, sizeof(struct smb_rqst)); 3363 memset(&iov, 0, sizeof(iov)); 3364 rqst.rq_iov = iov; 3365 rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE; 3366 3367 rc = SMB2_ioctl_init(tcon, server, 3368 &rqst, persistent_fid, volatile_fid, opcode, 3369 in_data, indatalen, max_out_data_len); 3370 if (rc) 3371 goto ioctl_exit; 3372 3373 rc = cifs_send_recv(xid, ses, server, 3374 &rqst, &resp_buftype, flags, 3375 &rsp_iov); 3376 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base; 3377 3378 if (rc != 0) 3379 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid, 3380 ses->Suid, 0, opcode, rc); 3381 3382 if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) { 3383 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3384 goto ioctl_exit; 3385 } else if (rc == -EINVAL) { 3386 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) && 3387 (opcode != FSCTL_SRV_COPYCHUNK)) { 3388 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3389 goto ioctl_exit; 3390 } 3391 } else if (rc == -E2BIG) { 3392 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) { 3393 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3394 goto ioctl_exit; 3395 } 3396 } 3397 3398 /* check if caller wants to look at return data or just return rc */ 3399 if ((plen == NULL) || (out_data == NULL)) 3400 goto ioctl_exit; 3401 3402 /* 3403 * Although unlikely to be possible for rsp to be null and rc not set, 3404 * adding check below is slightly safer long term (and quiets Coverity 3405 * warning) 3406 */ 3407 if (rsp == NULL) { 3408 rc = -EIO; 3409 goto ioctl_exit; 3410 } 3411 3412 *plen = le32_to_cpu(rsp->OutputCount); 3413 3414 /* We check for obvious errors in the output buffer length and offset */ 3415 if (*plen == 0) 3416 goto ioctl_exit; /* server returned no data */ 3417 else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) { 3418 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen); 3419 *plen = 0; 3420 rc = -EIO; 3421 goto ioctl_exit; 3422 } 3423 3424 if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) { 3425 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen, 3426 le32_to_cpu(rsp->OutputOffset)); 3427 *plen = 0; 3428 rc = -EIO; 3429 goto ioctl_exit; 3430 } 3431 3432 *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset), 3433 *plen, GFP_KERNEL); 3434 if (*out_data == NULL) { 3435 rc = -ENOMEM; 3436 goto ioctl_exit; 3437 } 3438 3439 ioctl_exit: 3440 SMB2_ioctl_free(&rqst); 3441 free_rsp_buf(resp_buftype, rsp); 3442 return rc; 3443 } 3444 3445 /* 3446 * Individual callers to ioctl worker function follow 3447 */ 3448 3449 int 3450 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon, 3451 u64 persistent_fid, u64 volatile_fid) 3452 { 3453 int rc; 3454 struct compress_ioctl fsctl_input; 3455 char *ret_data = NULL; 3456 3457 fsctl_input.CompressionState = 3458 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT); 3459 3460 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid, 3461 FSCTL_SET_COMPRESSION, 3462 (char *)&fsctl_input /* data input */, 3463 2 /* in data len */, CIFSMaxBufSize /* max out data */, 3464 &ret_data /* out data */, NULL); 3465 3466 cifs_dbg(FYI, "set compression rc %d\n", rc); 3467 3468 return rc; 3469 } 3470 3471 int 3472 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3473 struct smb_rqst *rqst, 3474 u64 persistent_fid, u64 volatile_fid, bool query_attrs) 3475 { 3476 struct smb2_close_req *req; 3477 struct kvec *iov = rqst->rq_iov; 3478 unsigned int total_len; 3479 int rc; 3480 3481 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server, 3482 (void **) &req, &total_len); 3483 if (rc) 3484 return rc; 3485 3486 req->PersistentFileId = persistent_fid; 3487 req->VolatileFileId = volatile_fid; 3488 if (query_attrs) 3489 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB; 3490 else 3491 req->Flags = 0; 3492 iov[0].iov_base = (char *)req; 3493 iov[0].iov_len = total_len; 3494 3495 return 0; 3496 } 3497 3498 void 3499 SMB2_close_free(struct smb_rqst *rqst) 3500 { 3501 if (rqst && rqst->rq_iov) 3502 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3503 } 3504 3505 int 3506 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, 3507 u64 persistent_fid, u64 volatile_fid, 3508 struct smb2_file_network_open_info *pbuf) 3509 { 3510 struct smb_rqst rqst; 3511 struct smb2_close_rsp *rsp = NULL; 3512 struct cifs_ses *ses = tcon->ses; 3513 struct TCP_Server_Info *server = cifs_pick_channel(ses); 3514 struct kvec iov[1]; 3515 struct kvec rsp_iov; 3516 int resp_buftype = CIFS_NO_BUFFER; 3517 int rc = 0; 3518 int flags = 0; 3519 bool query_attrs = false; 3520 3521 cifs_dbg(FYI, "Close\n"); 3522 3523 if (!ses || !server) 3524 return -EIO; 3525 3526 if (smb3_encryption_required(tcon)) 3527 flags |= CIFS_TRANSFORM_REQ; 3528 3529 memset(&rqst, 0, sizeof(struct smb_rqst)); 3530 memset(&iov, 0, sizeof(iov)); 3531 rqst.rq_iov = iov; 3532 rqst.rq_nvec = 1; 3533 3534 /* check if need to ask server to return timestamps in close response */ 3535 if (pbuf) 3536 query_attrs = true; 3537 3538 trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid); 3539 rc = SMB2_close_init(tcon, server, 3540 &rqst, persistent_fid, volatile_fid, 3541 query_attrs); 3542 if (rc) 3543 goto close_exit; 3544 3545 rc = cifs_send_recv(xid, ses, server, 3546 &rqst, &resp_buftype, flags, &rsp_iov); 3547 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base; 3548 3549 if (rc != 0) { 3550 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE); 3551 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid, 3552 rc); 3553 goto close_exit; 3554 } else { 3555 trace_smb3_close_done(xid, persistent_fid, tcon->tid, 3556 ses->Suid); 3557 if (pbuf) 3558 memcpy(&pbuf->network_open_info, 3559 &rsp->network_open_info, 3560 sizeof(pbuf->network_open_info)); 3561 atomic_dec(&tcon->num_remote_opens); 3562 } 3563 3564 close_exit: 3565 SMB2_close_free(&rqst); 3566 free_rsp_buf(resp_buftype, rsp); 3567 3568 /* retry close in a worker thread if this one is interrupted */ 3569 if (is_interrupt_error(rc)) { 3570 int tmp_rc; 3571 3572 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid, 3573 volatile_fid); 3574 if (tmp_rc) 3575 cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n", 3576 persistent_fid, tmp_rc); 3577 } 3578 return rc; 3579 } 3580 3581 int 3582 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, 3583 u64 persistent_fid, u64 volatile_fid) 3584 { 3585 return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL); 3586 } 3587 3588 int 3589 smb2_validate_iov(unsigned int offset, unsigned int buffer_length, 3590 struct kvec *iov, unsigned int min_buf_size) 3591 { 3592 unsigned int smb_len = iov->iov_len; 3593 char *end_of_smb = smb_len + (char *)iov->iov_base; 3594 char *begin_of_buf = offset + (char *)iov->iov_base; 3595 char *end_of_buf = begin_of_buf + buffer_length; 3596 3597 3598 if (buffer_length < min_buf_size) { 3599 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n", 3600 buffer_length, min_buf_size); 3601 return -EINVAL; 3602 } 3603 3604 /* check if beyond RFC1001 maximum length */ 3605 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) { 3606 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n", 3607 buffer_length, smb_len); 3608 return -EINVAL; 3609 } 3610 3611 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) { 3612 cifs_dbg(VFS, "Invalid server response, bad offset to data\n"); 3613 return -EINVAL; 3614 } 3615 3616 return 0; 3617 } 3618 3619 /* 3620 * If SMB buffer fields are valid, copy into temporary buffer to hold result. 3621 * Caller must free buffer. 3622 */ 3623 int 3624 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length, 3625 struct kvec *iov, unsigned int minbufsize, 3626 char *data) 3627 { 3628 char *begin_of_buf = offset + (char *)iov->iov_base; 3629 int rc; 3630 3631 if (!data) 3632 return -EINVAL; 3633 3634 rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize); 3635 if (rc) 3636 return rc; 3637 3638 memcpy(data, begin_of_buf, minbufsize); 3639 3640 return 0; 3641 } 3642 3643 int 3644 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3645 struct smb_rqst *rqst, 3646 u64 persistent_fid, u64 volatile_fid, 3647 u8 info_class, u8 info_type, u32 additional_info, 3648 size_t output_len, size_t input_len, void *input) 3649 { 3650 struct smb2_query_info_req *req; 3651 struct kvec *iov = rqst->rq_iov; 3652 unsigned int total_len; 3653 size_t len; 3654 int rc; 3655 3656 if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) || 3657 len > CIFSMaxBufSize)) 3658 return -EINVAL; 3659 3660 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server, 3661 (void **) &req, &total_len); 3662 if (rc) 3663 return rc; 3664 3665 req->InfoType = info_type; 3666 req->FileInfoClass = info_class; 3667 req->PersistentFileId = persistent_fid; 3668 req->VolatileFileId = volatile_fid; 3669 req->AdditionalInformation = cpu_to_le32(additional_info); 3670 3671 req->OutputBufferLength = cpu_to_le32(output_len); 3672 if (input_len) { 3673 req->InputBufferLength = cpu_to_le32(input_len); 3674 /* total_len for smb query request never close to le16 max */ 3675 req->InputBufferOffset = cpu_to_le16(total_len - 1); 3676 memcpy(req->Buffer, input, input_len); 3677 } 3678 3679 iov[0].iov_base = (char *)req; 3680 /* 1 for Buffer */ 3681 iov[0].iov_len = len; 3682 return 0; 3683 } 3684 3685 void 3686 SMB2_query_info_free(struct smb_rqst *rqst) 3687 { 3688 if (rqst && rqst->rq_iov) 3689 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3690 } 3691 3692 static int 3693 query_info(const unsigned int xid, struct cifs_tcon *tcon, 3694 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type, 3695 u32 additional_info, size_t output_len, size_t min_len, void **data, 3696 u32 *dlen) 3697 { 3698 struct smb_rqst rqst; 3699 struct smb2_query_info_rsp *rsp = NULL; 3700 struct kvec iov[1]; 3701 struct kvec rsp_iov; 3702 int rc = 0; 3703 int resp_buftype = CIFS_NO_BUFFER; 3704 struct cifs_ses *ses = tcon->ses; 3705 struct TCP_Server_Info *server; 3706 int flags = 0; 3707 bool allocated = false; 3708 3709 cifs_dbg(FYI, "Query Info\n"); 3710 3711 if (!ses) 3712 return -EIO; 3713 server = cifs_pick_channel(ses); 3714 if (!server) 3715 return -EIO; 3716 3717 if (smb3_encryption_required(tcon)) 3718 flags |= CIFS_TRANSFORM_REQ; 3719 3720 memset(&rqst, 0, sizeof(struct smb_rqst)); 3721 memset(&iov, 0, sizeof(iov)); 3722 rqst.rq_iov = iov; 3723 rqst.rq_nvec = 1; 3724 3725 rc = SMB2_query_info_init(tcon, server, 3726 &rqst, persistent_fid, volatile_fid, 3727 info_class, info_type, additional_info, 3728 output_len, 0, NULL); 3729 if (rc) 3730 goto qinf_exit; 3731 3732 trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid, 3733 ses->Suid, info_class, (__u32)info_type); 3734 3735 rc = cifs_send_recv(xid, ses, server, 3736 &rqst, &resp_buftype, flags, &rsp_iov); 3737 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 3738 3739 if (rc) { 3740 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 3741 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid, 3742 ses->Suid, info_class, (__u32)info_type, rc); 3743 goto qinf_exit; 3744 } 3745 3746 trace_smb3_query_info_done(xid, persistent_fid, tcon->tid, 3747 ses->Suid, info_class, (__u32)info_type); 3748 3749 if (dlen) { 3750 *dlen = le32_to_cpu(rsp->OutputBufferLength); 3751 if (!*data) { 3752 *data = kmalloc(*dlen, GFP_KERNEL); 3753 if (!*data) { 3754 cifs_tcon_dbg(VFS, 3755 "Error %d allocating memory for acl\n", 3756 rc); 3757 *dlen = 0; 3758 rc = -ENOMEM; 3759 goto qinf_exit; 3760 } 3761 allocated = true; 3762 } 3763 } 3764 3765 rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset), 3766 le32_to_cpu(rsp->OutputBufferLength), 3767 &rsp_iov, dlen ? *dlen : min_len, *data); 3768 if (rc && allocated) { 3769 kfree(*data); 3770 *data = NULL; 3771 *dlen = 0; 3772 } 3773 3774 qinf_exit: 3775 SMB2_query_info_free(&rqst); 3776 free_rsp_buf(resp_buftype, rsp); 3777 return rc; 3778 } 3779 3780 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon, 3781 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data) 3782 { 3783 return query_info(xid, tcon, persistent_fid, volatile_fid, 3784 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0, 3785 sizeof(struct smb2_file_all_info) + PATH_MAX * 2, 3786 sizeof(struct smb2_file_all_info), (void **)&data, 3787 NULL); 3788 } 3789 3790 #if 0 3791 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */ 3792 int 3793 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon, 3794 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen) 3795 { 3796 size_t output_len = sizeof(struct smb311_posix_qinfo *) + 3797 (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2); 3798 *plen = 0; 3799 3800 return query_info(xid, tcon, persistent_fid, volatile_fid, 3801 SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0, 3802 output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen); 3803 /* Note caller must free "data" (passed in above). It may be allocated in query_info call */ 3804 } 3805 #endif 3806 3807 int 3808 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon, 3809 u64 persistent_fid, u64 volatile_fid, 3810 void **data, u32 *plen, u32 extra_info) 3811 { 3812 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO | 3813 extra_info; 3814 *plen = 0; 3815 3816 return query_info(xid, tcon, persistent_fid, volatile_fid, 3817 0, SMB2_O_INFO_SECURITY, additional_info, 3818 SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen); 3819 } 3820 3821 int 3822 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon, 3823 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid) 3824 { 3825 return query_info(xid, tcon, persistent_fid, volatile_fid, 3826 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0, 3827 sizeof(struct smb2_file_internal_info), 3828 sizeof(struct smb2_file_internal_info), 3829 (void **)&uniqueid, NULL); 3830 } 3831 3832 /* 3833 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory 3834 * See MS-SMB2 2.2.35 and 2.2.36 3835 */ 3836 3837 static int 3838 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst, 3839 struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3840 u64 persistent_fid, u64 volatile_fid, 3841 u32 completion_filter, bool watch_tree) 3842 { 3843 struct smb2_change_notify_req *req; 3844 struct kvec *iov = rqst->rq_iov; 3845 unsigned int total_len; 3846 int rc; 3847 3848 rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server, 3849 (void **) &req, &total_len); 3850 if (rc) 3851 return rc; 3852 3853 req->PersistentFileId = persistent_fid; 3854 req->VolatileFileId = volatile_fid; 3855 /* See note 354 of MS-SMB2, 64K max */ 3856 req->OutputBufferLength = 3857 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE); 3858 req->CompletionFilter = cpu_to_le32(completion_filter); 3859 if (watch_tree) 3860 req->Flags = cpu_to_le16(SMB2_WATCH_TREE); 3861 else 3862 req->Flags = 0; 3863 3864 iov[0].iov_base = (char *)req; 3865 iov[0].iov_len = total_len; 3866 3867 return 0; 3868 } 3869 3870 int 3871 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon, 3872 u64 persistent_fid, u64 volatile_fid, bool watch_tree, 3873 u32 completion_filter, u32 max_out_data_len, char **out_data, 3874 u32 *plen /* returned data len */) 3875 { 3876 struct cifs_ses *ses = tcon->ses; 3877 struct TCP_Server_Info *server = cifs_pick_channel(ses); 3878 struct smb_rqst rqst; 3879 struct smb2_change_notify_rsp *smb_rsp; 3880 struct kvec iov[1]; 3881 struct kvec rsp_iov = {NULL, 0}; 3882 int resp_buftype = CIFS_NO_BUFFER; 3883 int flags = 0; 3884 int rc = 0; 3885 3886 cifs_dbg(FYI, "change notify\n"); 3887 if (!ses || !server) 3888 return -EIO; 3889 3890 if (smb3_encryption_required(tcon)) 3891 flags |= CIFS_TRANSFORM_REQ; 3892 3893 memset(&rqst, 0, sizeof(struct smb_rqst)); 3894 memset(&iov, 0, sizeof(iov)); 3895 if (plen) 3896 *plen = 0; 3897 3898 rqst.rq_iov = iov; 3899 rqst.rq_nvec = 1; 3900 3901 rc = SMB2_notify_init(xid, &rqst, tcon, server, 3902 persistent_fid, volatile_fid, 3903 completion_filter, watch_tree); 3904 if (rc) 3905 goto cnotify_exit; 3906 3907 trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid, 3908 (u8)watch_tree, completion_filter); 3909 rc = cifs_send_recv(xid, ses, server, 3910 &rqst, &resp_buftype, flags, &rsp_iov); 3911 3912 if (rc != 0) { 3913 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE); 3914 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid, 3915 (u8)watch_tree, completion_filter, rc); 3916 } else { 3917 trace_smb3_notify_done(xid, persistent_fid, tcon->tid, 3918 ses->Suid, (u8)watch_tree, completion_filter); 3919 /* validate that notify information is plausible */ 3920 if ((rsp_iov.iov_base == NULL) || 3921 (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1)) 3922 goto cnotify_exit; 3923 3924 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base; 3925 3926 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset), 3927 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov, 3928 sizeof(struct file_notify_information)); 3929 3930 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset), 3931 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL); 3932 if (*out_data == NULL) { 3933 rc = -ENOMEM; 3934 goto cnotify_exit; 3935 } else if (plen) 3936 *plen = le32_to_cpu(smb_rsp->OutputBufferLength); 3937 } 3938 3939 cnotify_exit: 3940 if (rqst.rq_iov) 3941 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */ 3942 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 3943 return rc; 3944 } 3945 3946 3947 3948 /* 3949 * This is a no-op for now. We're not really interested in the reply, but 3950 * rather in the fact that the server sent one and that server->lstrp 3951 * gets updated. 3952 * 3953 * FIXME: maybe we should consider checking that the reply matches request? 3954 */ 3955 static void 3956 smb2_echo_callback(struct mid_q_entry *mid) 3957 { 3958 struct TCP_Server_Info *server = mid->callback_data; 3959 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf; 3960 struct cifs_credits credits = { .value = 0, .instance = 0 }; 3961 3962 if (mid->mid_state == MID_RESPONSE_RECEIVED 3963 || mid->mid_state == MID_RESPONSE_MALFORMED) { 3964 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 3965 credits.instance = server->reconnect_instance; 3966 } 3967 3968 release_mid(mid); 3969 add_credits(server, &credits, CIFS_ECHO_OP); 3970 } 3971 3972 void smb2_reconnect_server(struct work_struct *work) 3973 { 3974 struct TCP_Server_Info *server = container_of(work, 3975 struct TCP_Server_Info, reconnect.work); 3976 struct TCP_Server_Info *pserver; 3977 struct cifs_ses *ses, *ses2; 3978 struct cifs_tcon *tcon, *tcon2; 3979 struct list_head tmp_list, tmp_ses_list; 3980 bool ses_exist = false; 3981 bool tcon_selected = false; 3982 int rc; 3983 bool resched = false; 3984 3985 /* first check if ref count has reached 0, if not inc ref count */ 3986 spin_lock(&cifs_tcp_ses_lock); 3987 if (!server->srv_count) { 3988 spin_unlock(&cifs_tcp_ses_lock); 3989 return; 3990 } 3991 server->srv_count++; 3992 spin_unlock(&cifs_tcp_ses_lock); 3993 3994 /* If server is a channel, select the primary channel */ 3995 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 3996 3997 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */ 3998 mutex_lock(&pserver->reconnect_mutex); 3999 4000 /* if the server is marked for termination, drop the ref count here */ 4001 if (server->terminate) { 4002 cifs_put_tcp_session(server, true); 4003 mutex_unlock(&pserver->reconnect_mutex); 4004 return; 4005 } 4006 4007 INIT_LIST_HEAD(&tmp_list); 4008 INIT_LIST_HEAD(&tmp_ses_list); 4009 cifs_dbg(FYI, "Reconnecting tcons and channels\n"); 4010 4011 spin_lock(&cifs_tcp_ses_lock); 4012 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { 4013 spin_lock(&ses->ses_lock); 4014 if (ses->ses_status == SES_EXITING) { 4015 spin_unlock(&ses->ses_lock); 4016 continue; 4017 } 4018 spin_unlock(&ses->ses_lock); 4019 4020 tcon_selected = false; 4021 4022 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { 4023 if (tcon->need_reconnect || tcon->need_reopen_files) { 4024 tcon->tc_count++; 4025 list_add_tail(&tcon->rlist, &tmp_list); 4026 tcon_selected = true; 4027 } 4028 } 4029 /* 4030 * IPC has the same lifetime as its session and uses its 4031 * refcount. 4032 */ 4033 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) { 4034 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list); 4035 tcon_selected = true; 4036 cifs_smb_ses_inc_refcount(ses); 4037 } 4038 /* 4039 * handle the case where channel needs to reconnect 4040 * binding session, but tcon is healthy (some other channel 4041 * is active) 4042 */ 4043 spin_lock(&ses->chan_lock); 4044 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) { 4045 list_add_tail(&ses->rlist, &tmp_ses_list); 4046 ses_exist = true; 4047 cifs_smb_ses_inc_refcount(ses); 4048 } 4049 spin_unlock(&ses->chan_lock); 4050 } 4051 spin_unlock(&cifs_tcp_ses_lock); 4052 4053 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) { 4054 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true); 4055 if (!rc) 4056 cifs_reopen_persistent_handles(tcon); 4057 else 4058 resched = true; 4059 list_del_init(&tcon->rlist); 4060 if (tcon->ipc) 4061 cifs_put_smb_ses(tcon->ses); 4062 else 4063 cifs_put_tcon(tcon); 4064 } 4065 4066 if (!ses_exist) 4067 goto done; 4068 4069 /* allocate a dummy tcon struct used for reconnect */ 4070 tcon = tcon_info_alloc(false); 4071 if (!tcon) { 4072 resched = true; 4073 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) { 4074 list_del_init(&ses->rlist); 4075 cifs_put_smb_ses(ses); 4076 } 4077 goto done; 4078 } 4079 4080 tcon->status = TID_GOOD; 4081 tcon->retry = false; 4082 tcon->need_reconnect = false; 4083 4084 /* now reconnect sessions for necessary channels */ 4085 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) { 4086 tcon->ses = ses; 4087 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true); 4088 if (rc) 4089 resched = true; 4090 list_del_init(&ses->rlist); 4091 cifs_put_smb_ses(ses); 4092 } 4093 tconInfoFree(tcon); 4094 4095 done: 4096 cifs_dbg(FYI, "Reconnecting tcons and channels finished\n"); 4097 if (resched) 4098 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ); 4099 mutex_unlock(&pserver->reconnect_mutex); 4100 4101 /* now we can safely release srv struct */ 4102 cifs_put_tcp_session(server, true); 4103 } 4104 4105 int 4106 SMB2_echo(struct TCP_Server_Info *server) 4107 { 4108 struct smb2_echo_req *req; 4109 int rc = 0; 4110 struct kvec iov[1]; 4111 struct smb_rqst rqst = { .rq_iov = iov, 4112 .rq_nvec = 1 }; 4113 unsigned int total_len; 4114 4115 cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id); 4116 4117 spin_lock(&server->srv_lock); 4118 if (server->ops->need_neg && 4119 server->ops->need_neg(server)) { 4120 spin_unlock(&server->srv_lock); 4121 /* No need to send echo on newly established connections */ 4122 mod_delayed_work(cifsiod_wq, &server->reconnect, 0); 4123 return rc; 4124 } 4125 spin_unlock(&server->srv_lock); 4126 4127 rc = smb2_plain_req_init(SMB2_ECHO, NULL, server, 4128 (void **)&req, &total_len); 4129 if (rc) 4130 return rc; 4131 4132 req->hdr.CreditRequest = cpu_to_le16(1); 4133 4134 iov[0].iov_len = total_len; 4135 iov[0].iov_base = (char *)req; 4136 4137 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL, 4138 server, CIFS_ECHO_OP, NULL); 4139 if (rc) 4140 cifs_dbg(FYI, "Echo request failed: %d\n", rc); 4141 4142 cifs_small_buf_release(req); 4143 return rc; 4144 } 4145 4146 void 4147 SMB2_flush_free(struct smb_rqst *rqst) 4148 { 4149 if (rqst && rqst->rq_iov) 4150 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 4151 } 4152 4153 int 4154 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst, 4155 struct cifs_tcon *tcon, struct TCP_Server_Info *server, 4156 u64 persistent_fid, u64 volatile_fid) 4157 { 4158 struct smb2_flush_req *req; 4159 struct kvec *iov = rqst->rq_iov; 4160 unsigned int total_len; 4161 int rc; 4162 4163 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server, 4164 (void **) &req, &total_len); 4165 if (rc) 4166 return rc; 4167 4168 req->PersistentFileId = persistent_fid; 4169 req->VolatileFileId = volatile_fid; 4170 4171 iov[0].iov_base = (char *)req; 4172 iov[0].iov_len = total_len; 4173 4174 return 0; 4175 } 4176 4177 int 4178 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 4179 u64 volatile_fid) 4180 { 4181 struct cifs_ses *ses = tcon->ses; 4182 struct smb_rqst rqst; 4183 struct kvec iov[1]; 4184 struct kvec rsp_iov = {NULL, 0}; 4185 struct TCP_Server_Info *server = cifs_pick_channel(ses); 4186 int resp_buftype = CIFS_NO_BUFFER; 4187 int flags = 0; 4188 int rc = 0; 4189 4190 cifs_dbg(FYI, "flush\n"); 4191 if (!ses || !(ses->server)) 4192 return -EIO; 4193 4194 if (smb3_encryption_required(tcon)) 4195 flags |= CIFS_TRANSFORM_REQ; 4196 4197 memset(&rqst, 0, sizeof(struct smb_rqst)); 4198 memset(&iov, 0, sizeof(iov)); 4199 rqst.rq_iov = iov; 4200 rqst.rq_nvec = 1; 4201 4202 rc = SMB2_flush_init(xid, &rqst, tcon, server, 4203 persistent_fid, volatile_fid); 4204 if (rc) 4205 goto flush_exit; 4206 4207 trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid); 4208 rc = cifs_send_recv(xid, ses, server, 4209 &rqst, &resp_buftype, flags, &rsp_iov); 4210 4211 if (rc != 0) { 4212 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE); 4213 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid, 4214 rc); 4215 } else 4216 trace_smb3_flush_done(xid, persistent_fid, tcon->tid, 4217 ses->Suid); 4218 4219 flush_exit: 4220 SMB2_flush_free(&rqst); 4221 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4222 return rc; 4223 } 4224 4225 #ifdef CONFIG_CIFS_SMB_DIRECT 4226 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms) 4227 { 4228 struct TCP_Server_Info *server = io_parms->server; 4229 struct cifs_tcon *tcon = io_parms->tcon; 4230 4231 /* we can only offload if we're connected */ 4232 if (!server || !tcon) 4233 return false; 4234 4235 /* we can only offload on an rdma connection */ 4236 if (!server->rdma || !server->smbd_conn) 4237 return false; 4238 4239 /* we don't support signed offload yet */ 4240 if (server->sign) 4241 return false; 4242 4243 /* we don't support encrypted offload yet */ 4244 if (smb3_encryption_required(tcon)) 4245 return false; 4246 4247 /* offload also has its overhead, so only do it if desired */ 4248 if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold) 4249 return false; 4250 4251 return true; 4252 } 4253 #endif /* CONFIG_CIFS_SMB_DIRECT */ 4254 4255 /* 4256 * To form a chain of read requests, any read requests after the first should 4257 * have the end_of_chain boolean set to true. 4258 */ 4259 static int 4260 smb2_new_read_req(void **buf, unsigned int *total_len, 4261 struct cifs_io_parms *io_parms, struct cifs_readdata *rdata, 4262 unsigned int remaining_bytes, int request_type) 4263 { 4264 int rc = -EACCES; 4265 struct smb2_read_req *req = NULL; 4266 struct smb2_hdr *shdr; 4267 struct TCP_Server_Info *server = io_parms->server; 4268 4269 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server, 4270 (void **) &req, total_len); 4271 if (rc) 4272 return rc; 4273 4274 if (server == NULL) 4275 return -ECONNABORTED; 4276 4277 shdr = &req->hdr; 4278 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 4279 4280 req->PersistentFileId = io_parms->persistent_fid; 4281 req->VolatileFileId = io_parms->volatile_fid; 4282 req->ReadChannelInfoOffset = 0; /* reserved */ 4283 req->ReadChannelInfoLength = 0; /* reserved */ 4284 req->Channel = 0; /* reserved */ 4285 req->MinimumCount = 0; 4286 req->Length = cpu_to_le32(io_parms->length); 4287 req->Offset = cpu_to_le64(io_parms->offset); 4288 4289 trace_smb3_read_enter(0 /* xid */, 4290 io_parms->persistent_fid, 4291 io_parms->tcon->tid, io_parms->tcon->ses->Suid, 4292 io_parms->offset, io_parms->length); 4293 #ifdef CONFIG_CIFS_SMB_DIRECT 4294 /* 4295 * If we want to do a RDMA write, fill in and append 4296 * smbd_buffer_descriptor_v1 to the end of read request 4297 */ 4298 if (smb3_use_rdma_offload(io_parms)) { 4299 struct smbd_buffer_descriptor_v1 *v1; 4300 bool need_invalidate = server->dialect == SMB30_PROT_ID; 4301 4302 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->iter, 4303 true, need_invalidate); 4304 if (!rdata->mr) 4305 return -EAGAIN; 4306 4307 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE; 4308 if (need_invalidate) 4309 req->Channel = SMB2_CHANNEL_RDMA_V1; 4310 req->ReadChannelInfoOffset = 4311 cpu_to_le16(offsetof(struct smb2_read_req, Buffer)); 4312 req->ReadChannelInfoLength = 4313 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1)); 4314 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0]; 4315 v1->offset = cpu_to_le64(rdata->mr->mr->iova); 4316 v1->token = cpu_to_le32(rdata->mr->mr->rkey); 4317 v1->length = cpu_to_le32(rdata->mr->mr->length); 4318 4319 *total_len += sizeof(*v1) - 1; 4320 } 4321 #endif 4322 if (request_type & CHAINED_REQUEST) { 4323 if (!(request_type & END_OF_CHAIN)) { 4324 /* next 8-byte aligned request */ 4325 *total_len = ALIGN(*total_len, 8); 4326 shdr->NextCommand = cpu_to_le32(*total_len); 4327 } else /* END_OF_CHAIN */ 4328 shdr->NextCommand = 0; 4329 if (request_type & RELATED_REQUEST) { 4330 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS; 4331 /* 4332 * Related requests use info from previous read request 4333 * in chain. 4334 */ 4335 shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF); 4336 shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF); 4337 req->PersistentFileId = (u64)-1; 4338 req->VolatileFileId = (u64)-1; 4339 } 4340 } 4341 if (remaining_bytes > io_parms->length) 4342 req->RemainingBytes = cpu_to_le32(remaining_bytes); 4343 else 4344 req->RemainingBytes = 0; 4345 4346 *buf = req; 4347 return rc; 4348 } 4349 4350 static void 4351 smb2_readv_callback(struct mid_q_entry *mid) 4352 { 4353 struct cifs_readdata *rdata = mid->callback_data; 4354 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); 4355 struct TCP_Server_Info *server = rdata->server; 4356 struct smb2_hdr *shdr = 4357 (struct smb2_hdr *)rdata->iov[0].iov_base; 4358 struct cifs_credits credits = { .value = 0, .instance = 0 }; 4359 struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 }; 4360 4361 if (rdata->got_bytes) { 4362 rqst.rq_iter = rdata->iter; 4363 rqst.rq_iter_size = iov_iter_count(&rdata->iter); 4364 } 4365 4366 WARN_ONCE(rdata->server != mid->server, 4367 "rdata server %p != mid server %p", 4368 rdata->server, mid->server); 4369 4370 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n", 4371 __func__, mid->mid, mid->mid_state, rdata->result, 4372 rdata->bytes); 4373 4374 switch (mid->mid_state) { 4375 case MID_RESPONSE_RECEIVED: 4376 credits.value = le16_to_cpu(shdr->CreditRequest); 4377 credits.instance = server->reconnect_instance; 4378 /* result already set, check signature */ 4379 if (server->sign && !mid->decrypted) { 4380 int rc; 4381 4382 iov_iter_revert(&rqst.rq_iter, rdata->got_bytes); 4383 iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes); 4384 rc = smb2_verify_signature(&rqst, server); 4385 if (rc) 4386 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n", 4387 rc); 4388 } 4389 /* FIXME: should this be counted toward the initiating task? */ 4390 task_io_account_read(rdata->got_bytes); 4391 cifs_stats_bytes_read(tcon, rdata->got_bytes); 4392 break; 4393 case MID_REQUEST_SUBMITTED: 4394 case MID_RETRY_NEEDED: 4395 rdata->result = -EAGAIN; 4396 if (server->sign && rdata->got_bytes) 4397 /* reset bytes number since we can not check a sign */ 4398 rdata->got_bytes = 0; 4399 /* FIXME: should this be counted toward the initiating task? */ 4400 task_io_account_read(rdata->got_bytes); 4401 cifs_stats_bytes_read(tcon, rdata->got_bytes); 4402 break; 4403 case MID_RESPONSE_MALFORMED: 4404 credits.value = le16_to_cpu(shdr->CreditRequest); 4405 credits.instance = server->reconnect_instance; 4406 fallthrough; 4407 default: 4408 rdata->result = -EIO; 4409 } 4410 #ifdef CONFIG_CIFS_SMB_DIRECT 4411 /* 4412 * If this rdata has a memmory registered, the MR can be freed 4413 * MR needs to be freed as soon as I/O finishes to prevent deadlock 4414 * because they have limited number and are used for future I/Os 4415 */ 4416 if (rdata->mr) { 4417 smbd_deregister_mr(rdata->mr); 4418 rdata->mr = NULL; 4419 } 4420 #endif 4421 if (rdata->result && rdata->result != -ENODATA) { 4422 cifs_stats_fail_inc(tcon, SMB2_READ_HE); 4423 trace_smb3_read_err(0 /* xid */, 4424 rdata->cfile->fid.persistent_fid, 4425 tcon->tid, tcon->ses->Suid, rdata->offset, 4426 rdata->bytes, rdata->result); 4427 } else 4428 trace_smb3_read_done(0 /* xid */, 4429 rdata->cfile->fid.persistent_fid, 4430 tcon->tid, tcon->ses->Suid, 4431 rdata->offset, rdata->got_bytes); 4432 4433 queue_work(cifsiod_wq, &rdata->work); 4434 release_mid(mid); 4435 add_credits(server, &credits, 0); 4436 } 4437 4438 /* smb2_async_readv - send an async read, and set up mid to handle result */ 4439 int 4440 smb2_async_readv(struct cifs_readdata *rdata) 4441 { 4442 int rc, flags = 0; 4443 char *buf; 4444 struct smb2_hdr *shdr; 4445 struct cifs_io_parms io_parms; 4446 struct smb_rqst rqst = { .rq_iov = rdata->iov, 4447 .rq_nvec = 1 }; 4448 struct TCP_Server_Info *server; 4449 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); 4450 unsigned int total_len; 4451 int credit_request; 4452 4453 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n", 4454 __func__, rdata->offset, rdata->bytes); 4455 4456 if (!rdata->server) 4457 rdata->server = cifs_pick_channel(tcon->ses); 4458 4459 io_parms.tcon = tlink_tcon(rdata->cfile->tlink); 4460 io_parms.server = server = rdata->server; 4461 io_parms.offset = rdata->offset; 4462 io_parms.length = rdata->bytes; 4463 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid; 4464 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid; 4465 io_parms.pid = rdata->pid; 4466 4467 rc = smb2_new_read_req( 4468 (void **) &buf, &total_len, &io_parms, rdata, 0, 0); 4469 if (rc) 4470 return rc; 4471 4472 if (smb3_encryption_required(io_parms.tcon)) 4473 flags |= CIFS_TRANSFORM_REQ; 4474 4475 rdata->iov[0].iov_base = buf; 4476 rdata->iov[0].iov_len = total_len; 4477 4478 shdr = (struct smb2_hdr *)buf; 4479 4480 if (rdata->credits.value > 0) { 4481 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes, 4482 SMB2_MAX_BUFFER_SIZE)); 4483 credit_request = le16_to_cpu(shdr->CreditCharge) + 8; 4484 if (server->credits >= server->max_credits) 4485 shdr->CreditRequest = cpu_to_le16(0); 4486 else 4487 shdr->CreditRequest = cpu_to_le16( 4488 min_t(int, server->max_credits - 4489 server->credits, credit_request)); 4490 4491 rc = adjust_credits(server, &rdata->credits, rdata->bytes); 4492 if (rc) 4493 goto async_readv_out; 4494 4495 flags |= CIFS_HAS_CREDITS; 4496 } 4497 4498 kref_get(&rdata->refcount); 4499 rc = cifs_call_async(server, &rqst, 4500 cifs_readv_receive, smb2_readv_callback, 4501 smb3_handle_read_data, rdata, flags, 4502 &rdata->credits); 4503 if (rc) { 4504 kref_put(&rdata->refcount, cifs_readdata_release); 4505 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE); 4506 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid, 4507 io_parms.tcon->tid, 4508 io_parms.tcon->ses->Suid, 4509 io_parms.offset, io_parms.length, rc); 4510 } 4511 4512 async_readv_out: 4513 cifs_small_buf_release(buf); 4514 return rc; 4515 } 4516 4517 int 4518 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms, 4519 unsigned int *nbytes, char **buf, int *buf_type) 4520 { 4521 struct smb_rqst rqst; 4522 int resp_buftype, rc; 4523 struct smb2_read_req *req = NULL; 4524 struct smb2_read_rsp *rsp = NULL; 4525 struct kvec iov[1]; 4526 struct kvec rsp_iov; 4527 unsigned int total_len; 4528 int flags = CIFS_LOG_ERROR; 4529 struct cifs_ses *ses = io_parms->tcon->ses; 4530 4531 if (!io_parms->server) 4532 io_parms->server = cifs_pick_channel(io_parms->tcon->ses); 4533 4534 *nbytes = 0; 4535 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0); 4536 if (rc) 4537 return rc; 4538 4539 if (smb3_encryption_required(io_parms->tcon)) 4540 flags |= CIFS_TRANSFORM_REQ; 4541 4542 iov[0].iov_base = (char *)req; 4543 iov[0].iov_len = total_len; 4544 4545 memset(&rqst, 0, sizeof(struct smb_rqst)); 4546 rqst.rq_iov = iov; 4547 rqst.rq_nvec = 1; 4548 4549 rc = cifs_send_recv(xid, ses, io_parms->server, 4550 &rqst, &resp_buftype, flags, &rsp_iov); 4551 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base; 4552 4553 if (rc) { 4554 if (rc != -ENODATA) { 4555 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE); 4556 cifs_dbg(VFS, "Send error in read = %d\n", rc); 4557 trace_smb3_read_err(xid, 4558 req->PersistentFileId, 4559 io_parms->tcon->tid, ses->Suid, 4560 io_parms->offset, io_parms->length, 4561 rc); 4562 } else 4563 trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid, 4564 ses->Suid, io_parms->offset, 0); 4565 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4566 cifs_small_buf_release(req); 4567 return rc == -ENODATA ? 0 : rc; 4568 } else 4569 trace_smb3_read_done(xid, 4570 req->PersistentFileId, 4571 io_parms->tcon->tid, ses->Suid, 4572 io_parms->offset, io_parms->length); 4573 4574 cifs_small_buf_release(req); 4575 4576 *nbytes = le32_to_cpu(rsp->DataLength); 4577 if ((*nbytes > CIFS_MAX_MSGSIZE) || 4578 (*nbytes > io_parms->length)) { 4579 cifs_dbg(FYI, "bad length %d for count %d\n", 4580 *nbytes, io_parms->length); 4581 rc = -EIO; 4582 *nbytes = 0; 4583 } 4584 4585 if (*buf) { 4586 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes); 4587 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4588 } else if (resp_buftype != CIFS_NO_BUFFER) { 4589 *buf = rsp_iov.iov_base; 4590 if (resp_buftype == CIFS_SMALL_BUFFER) 4591 *buf_type = CIFS_SMALL_BUFFER; 4592 else if (resp_buftype == CIFS_LARGE_BUFFER) 4593 *buf_type = CIFS_LARGE_BUFFER; 4594 } 4595 return rc; 4596 } 4597 4598 /* 4599 * Check the mid_state and signature on received buffer (if any), and queue the 4600 * workqueue completion task. 4601 */ 4602 static void 4603 smb2_writev_callback(struct mid_q_entry *mid) 4604 { 4605 struct cifs_writedata *wdata = mid->callback_data; 4606 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); 4607 struct TCP_Server_Info *server = wdata->server; 4608 unsigned int written; 4609 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; 4610 struct cifs_credits credits = { .value = 0, .instance = 0 }; 4611 4612 WARN_ONCE(wdata->server != mid->server, 4613 "wdata server %p != mid server %p", 4614 wdata->server, mid->server); 4615 4616 switch (mid->mid_state) { 4617 case MID_RESPONSE_RECEIVED: 4618 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 4619 credits.instance = server->reconnect_instance; 4620 wdata->result = smb2_check_receive(mid, server, 0); 4621 if (wdata->result != 0) 4622 break; 4623 4624 written = le32_to_cpu(rsp->DataLength); 4625 /* 4626 * Mask off high 16 bits when bytes written as returned 4627 * by the server is greater than bytes requested by the 4628 * client. OS/2 servers are known to set incorrect 4629 * CountHigh values. 4630 */ 4631 if (written > wdata->bytes) 4632 written &= 0xFFFF; 4633 4634 if (written < wdata->bytes) 4635 wdata->result = -ENOSPC; 4636 else 4637 wdata->bytes = written; 4638 break; 4639 case MID_REQUEST_SUBMITTED: 4640 case MID_RETRY_NEEDED: 4641 wdata->result = -EAGAIN; 4642 break; 4643 case MID_RESPONSE_MALFORMED: 4644 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 4645 credits.instance = server->reconnect_instance; 4646 fallthrough; 4647 default: 4648 wdata->result = -EIO; 4649 break; 4650 } 4651 #ifdef CONFIG_CIFS_SMB_DIRECT 4652 /* 4653 * If this wdata has a memory registered, the MR can be freed 4654 * The number of MRs available is limited, it's important to recover 4655 * used MR as soon as I/O is finished. Hold MR longer in the later 4656 * I/O process can possibly result in I/O deadlock due to lack of MR 4657 * to send request on I/O retry 4658 */ 4659 if (wdata->mr) { 4660 smbd_deregister_mr(wdata->mr); 4661 wdata->mr = NULL; 4662 } 4663 #endif 4664 if (wdata->result) { 4665 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); 4666 trace_smb3_write_err(0 /* no xid */, 4667 wdata->cfile->fid.persistent_fid, 4668 tcon->tid, tcon->ses->Suid, wdata->offset, 4669 wdata->bytes, wdata->result); 4670 if (wdata->result == -ENOSPC) 4671 pr_warn_once("Out of space writing to %s\n", 4672 tcon->tree_name); 4673 } else 4674 trace_smb3_write_done(0 /* no xid */, 4675 wdata->cfile->fid.persistent_fid, 4676 tcon->tid, tcon->ses->Suid, 4677 wdata->offset, wdata->bytes); 4678 4679 queue_work(cifsiod_wq, &wdata->work); 4680 release_mid(mid); 4681 add_credits(server, &credits, 0); 4682 } 4683 4684 /* smb2_async_writev - send an async write, and set up mid to handle result */ 4685 int 4686 smb2_async_writev(struct cifs_writedata *wdata, 4687 void (*release)(struct kref *kref)) 4688 { 4689 int rc = -EACCES, flags = 0; 4690 struct smb2_write_req *req = NULL; 4691 struct smb2_hdr *shdr; 4692 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); 4693 struct TCP_Server_Info *server = wdata->server; 4694 struct kvec iov[1]; 4695 struct smb_rqst rqst = { }; 4696 unsigned int total_len; 4697 struct cifs_io_parms _io_parms; 4698 struct cifs_io_parms *io_parms = NULL; 4699 int credit_request; 4700 4701 if (!wdata->server) 4702 server = wdata->server = cifs_pick_channel(tcon->ses); 4703 4704 /* 4705 * in future we may get cifs_io_parms passed in from the caller, 4706 * but for now we construct it here... 4707 */ 4708 _io_parms = (struct cifs_io_parms) { 4709 .tcon = tcon, 4710 .server = server, 4711 .offset = wdata->offset, 4712 .length = wdata->bytes, 4713 .persistent_fid = wdata->cfile->fid.persistent_fid, 4714 .volatile_fid = wdata->cfile->fid.volatile_fid, 4715 .pid = wdata->pid, 4716 }; 4717 io_parms = &_io_parms; 4718 4719 rc = smb2_plain_req_init(SMB2_WRITE, tcon, server, 4720 (void **) &req, &total_len); 4721 if (rc) 4722 return rc; 4723 4724 if (smb3_encryption_required(tcon)) 4725 flags |= CIFS_TRANSFORM_REQ; 4726 4727 shdr = (struct smb2_hdr *)req; 4728 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 4729 4730 req->PersistentFileId = io_parms->persistent_fid; 4731 req->VolatileFileId = io_parms->volatile_fid; 4732 req->WriteChannelInfoOffset = 0; 4733 req->WriteChannelInfoLength = 0; 4734 req->Channel = SMB2_CHANNEL_NONE; 4735 req->Offset = cpu_to_le64(io_parms->offset); 4736 req->DataOffset = cpu_to_le16( 4737 offsetof(struct smb2_write_req, Buffer)); 4738 req->RemainingBytes = 0; 4739 4740 trace_smb3_write_enter(0 /* xid */, 4741 io_parms->persistent_fid, 4742 io_parms->tcon->tid, 4743 io_parms->tcon->ses->Suid, 4744 io_parms->offset, 4745 io_parms->length); 4746 4747 #ifdef CONFIG_CIFS_SMB_DIRECT 4748 /* 4749 * If we want to do a server RDMA read, fill in and append 4750 * smbd_buffer_descriptor_v1 to the end of write request 4751 */ 4752 if (smb3_use_rdma_offload(io_parms)) { 4753 struct smbd_buffer_descriptor_v1 *v1; 4754 size_t data_size = iov_iter_count(&wdata->iter); 4755 bool need_invalidate = server->dialect == SMB30_PROT_ID; 4756 4757 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->iter, 4758 false, need_invalidate); 4759 if (!wdata->mr) { 4760 rc = -EAGAIN; 4761 goto async_writev_out; 4762 } 4763 req->Length = 0; 4764 req->DataOffset = 0; 4765 req->RemainingBytes = cpu_to_le32(data_size); 4766 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE; 4767 if (need_invalidate) 4768 req->Channel = SMB2_CHANNEL_RDMA_V1; 4769 req->WriteChannelInfoOffset = 4770 cpu_to_le16(offsetof(struct smb2_write_req, Buffer)); 4771 req->WriteChannelInfoLength = 4772 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1)); 4773 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0]; 4774 v1->offset = cpu_to_le64(wdata->mr->mr->iova); 4775 v1->token = cpu_to_le32(wdata->mr->mr->rkey); 4776 v1->length = cpu_to_le32(wdata->mr->mr->length); 4777 } 4778 #endif 4779 iov[0].iov_len = total_len - 1; 4780 iov[0].iov_base = (char *)req; 4781 4782 rqst.rq_iov = iov; 4783 rqst.rq_nvec = 1; 4784 rqst.rq_iter = wdata->iter; 4785 rqst.rq_iter_size = iov_iter_count(&rqst.rq_iter); 4786 #ifdef CONFIG_CIFS_SMB_DIRECT 4787 if (wdata->mr) 4788 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1); 4789 #endif 4790 cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n", 4791 io_parms->offset, io_parms->length, iov_iter_count(&rqst.rq_iter)); 4792 4793 #ifdef CONFIG_CIFS_SMB_DIRECT 4794 /* For RDMA read, I/O size is in RemainingBytes not in Length */ 4795 if (!wdata->mr) 4796 req->Length = cpu_to_le32(io_parms->length); 4797 #else 4798 req->Length = cpu_to_le32(io_parms->length); 4799 #endif 4800 4801 if (wdata->credits.value > 0) { 4802 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes, 4803 SMB2_MAX_BUFFER_SIZE)); 4804 credit_request = le16_to_cpu(shdr->CreditCharge) + 8; 4805 if (server->credits >= server->max_credits) 4806 shdr->CreditRequest = cpu_to_le16(0); 4807 else 4808 shdr->CreditRequest = cpu_to_le16( 4809 min_t(int, server->max_credits - 4810 server->credits, credit_request)); 4811 4812 rc = adjust_credits(server, &wdata->credits, io_parms->length); 4813 if (rc) 4814 goto async_writev_out; 4815 4816 flags |= CIFS_HAS_CREDITS; 4817 } 4818 4819 kref_get(&wdata->refcount); 4820 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL, 4821 wdata, flags, &wdata->credits); 4822 4823 if (rc) { 4824 trace_smb3_write_err(0 /* no xid */, 4825 io_parms->persistent_fid, 4826 io_parms->tcon->tid, 4827 io_parms->tcon->ses->Suid, 4828 io_parms->offset, 4829 io_parms->length, 4830 rc); 4831 kref_put(&wdata->refcount, release); 4832 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); 4833 } 4834 4835 async_writev_out: 4836 cifs_small_buf_release(req); 4837 return rc; 4838 } 4839 4840 /* 4841 * SMB2_write function gets iov pointer to kvec array with n_vec as a length. 4842 * The length field from io_parms must be at least 1 and indicates a number of 4843 * elements with data to write that begins with position 1 in iov array. All 4844 * data length is specified by count. 4845 */ 4846 int 4847 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms, 4848 unsigned int *nbytes, struct kvec *iov, int n_vec) 4849 { 4850 struct smb_rqst rqst; 4851 int rc = 0; 4852 struct smb2_write_req *req = NULL; 4853 struct smb2_write_rsp *rsp = NULL; 4854 int resp_buftype; 4855 struct kvec rsp_iov; 4856 int flags = 0; 4857 unsigned int total_len; 4858 struct TCP_Server_Info *server; 4859 4860 *nbytes = 0; 4861 4862 if (n_vec < 1) 4863 return rc; 4864 4865 if (!io_parms->server) 4866 io_parms->server = cifs_pick_channel(io_parms->tcon->ses); 4867 server = io_parms->server; 4868 if (server == NULL) 4869 return -ECONNABORTED; 4870 4871 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server, 4872 (void **) &req, &total_len); 4873 if (rc) 4874 return rc; 4875 4876 if (smb3_encryption_required(io_parms->tcon)) 4877 flags |= CIFS_TRANSFORM_REQ; 4878 4879 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 4880 4881 req->PersistentFileId = io_parms->persistent_fid; 4882 req->VolatileFileId = io_parms->volatile_fid; 4883 req->WriteChannelInfoOffset = 0; 4884 req->WriteChannelInfoLength = 0; 4885 req->Channel = 0; 4886 req->Length = cpu_to_le32(io_parms->length); 4887 req->Offset = cpu_to_le64(io_parms->offset); 4888 req->DataOffset = cpu_to_le16( 4889 offsetof(struct smb2_write_req, Buffer)); 4890 req->RemainingBytes = 0; 4891 4892 trace_smb3_write_enter(xid, io_parms->persistent_fid, 4893 io_parms->tcon->tid, io_parms->tcon->ses->Suid, 4894 io_parms->offset, io_parms->length); 4895 4896 iov[0].iov_base = (char *)req; 4897 /* 1 for Buffer */ 4898 iov[0].iov_len = total_len - 1; 4899 4900 memset(&rqst, 0, sizeof(struct smb_rqst)); 4901 rqst.rq_iov = iov; 4902 rqst.rq_nvec = n_vec + 1; 4903 4904 rc = cifs_send_recv(xid, io_parms->tcon->ses, server, 4905 &rqst, 4906 &resp_buftype, flags, &rsp_iov); 4907 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base; 4908 4909 if (rc) { 4910 trace_smb3_write_err(xid, 4911 req->PersistentFileId, 4912 io_parms->tcon->tid, 4913 io_parms->tcon->ses->Suid, 4914 io_parms->offset, io_parms->length, rc); 4915 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE); 4916 cifs_dbg(VFS, "Send error in write = %d\n", rc); 4917 } else { 4918 *nbytes = le32_to_cpu(rsp->DataLength); 4919 trace_smb3_write_done(xid, 4920 req->PersistentFileId, 4921 io_parms->tcon->tid, 4922 io_parms->tcon->ses->Suid, 4923 io_parms->offset, *nbytes); 4924 } 4925 4926 cifs_small_buf_release(req); 4927 free_rsp_buf(resp_buftype, rsp); 4928 return rc; 4929 } 4930 4931 int posix_info_sid_size(const void *beg, const void *end) 4932 { 4933 size_t subauth; 4934 int total; 4935 4936 if (beg + 1 > end) 4937 return -1; 4938 4939 subauth = *(u8 *)(beg+1); 4940 if (subauth < 1 || subauth > 15) 4941 return -1; 4942 4943 total = 1 + 1 + 6 + 4*subauth; 4944 if (beg + total > end) 4945 return -1; 4946 4947 return total; 4948 } 4949 4950 int posix_info_parse(const void *beg, const void *end, 4951 struct smb2_posix_info_parsed *out) 4952 4953 { 4954 int total_len = 0; 4955 int owner_len, group_len; 4956 int name_len; 4957 const void *owner_sid; 4958 const void *group_sid; 4959 const void *name; 4960 4961 /* if no end bound given, assume payload to be correct */ 4962 if (!end) { 4963 const struct smb2_posix_info *p = beg; 4964 4965 end = beg + le32_to_cpu(p->NextEntryOffset); 4966 /* last element will have a 0 offset, pick a sensible bound */ 4967 if (end == beg) 4968 end += 0xFFFF; 4969 } 4970 4971 /* check base buf */ 4972 if (beg + sizeof(struct smb2_posix_info) > end) 4973 return -1; 4974 total_len = sizeof(struct smb2_posix_info); 4975 4976 /* check owner sid */ 4977 owner_sid = beg + total_len; 4978 owner_len = posix_info_sid_size(owner_sid, end); 4979 if (owner_len < 0) 4980 return -1; 4981 total_len += owner_len; 4982 4983 /* check group sid */ 4984 group_sid = beg + total_len; 4985 group_len = posix_info_sid_size(group_sid, end); 4986 if (group_len < 0) 4987 return -1; 4988 total_len += group_len; 4989 4990 /* check name len */ 4991 if (beg + total_len + 4 > end) 4992 return -1; 4993 name_len = le32_to_cpu(*(__le32 *)(beg + total_len)); 4994 if (name_len < 1 || name_len > 0xFFFF) 4995 return -1; 4996 total_len += 4; 4997 4998 /* check name */ 4999 name = beg + total_len; 5000 if (name + name_len > end) 5001 return -1; 5002 total_len += name_len; 5003 5004 if (out) { 5005 out->base = beg; 5006 out->size = total_len; 5007 out->name_len = name_len; 5008 out->name = name; 5009 memcpy(&out->owner, owner_sid, owner_len); 5010 memcpy(&out->group, group_sid, group_len); 5011 } 5012 return total_len; 5013 } 5014 5015 static int posix_info_extra_size(const void *beg, const void *end) 5016 { 5017 int len = posix_info_parse(beg, end, NULL); 5018 5019 if (len < 0) 5020 return -1; 5021 return len - sizeof(struct smb2_posix_info); 5022 } 5023 5024 static unsigned int 5025 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry, 5026 size_t size) 5027 { 5028 int len; 5029 unsigned int entrycount = 0; 5030 unsigned int next_offset = 0; 5031 char *entryptr; 5032 FILE_DIRECTORY_INFO *dir_info; 5033 5034 if (bufstart == NULL) 5035 return 0; 5036 5037 entryptr = bufstart; 5038 5039 while (1) { 5040 if (entryptr + next_offset < entryptr || 5041 entryptr + next_offset > end_of_buf || 5042 entryptr + next_offset + size > end_of_buf) { 5043 cifs_dbg(VFS, "malformed search entry would overflow\n"); 5044 break; 5045 } 5046 5047 entryptr = entryptr + next_offset; 5048 dir_info = (FILE_DIRECTORY_INFO *)entryptr; 5049 5050 if (infotype == SMB_FIND_FILE_POSIX_INFO) 5051 len = posix_info_extra_size(entryptr, end_of_buf); 5052 else 5053 len = le32_to_cpu(dir_info->FileNameLength); 5054 5055 if (len < 0 || 5056 entryptr + len < entryptr || 5057 entryptr + len > end_of_buf || 5058 entryptr + len + size > end_of_buf) { 5059 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n", 5060 end_of_buf); 5061 break; 5062 } 5063 5064 *lastentry = entryptr; 5065 entrycount++; 5066 5067 next_offset = le32_to_cpu(dir_info->NextEntryOffset); 5068 if (!next_offset) 5069 break; 5070 } 5071 5072 return entrycount; 5073 } 5074 5075 /* 5076 * Readdir/FindFirst 5077 */ 5078 int SMB2_query_directory_init(const unsigned int xid, 5079 struct cifs_tcon *tcon, 5080 struct TCP_Server_Info *server, 5081 struct smb_rqst *rqst, 5082 u64 persistent_fid, u64 volatile_fid, 5083 int index, int info_level) 5084 { 5085 struct smb2_query_directory_req *req; 5086 unsigned char *bufptr; 5087 __le16 asteriks = cpu_to_le16('*'); 5088 unsigned int output_size = CIFSMaxBufSize - 5089 MAX_SMB2_CREATE_RESPONSE_SIZE - 5090 MAX_SMB2_CLOSE_RESPONSE_SIZE; 5091 unsigned int total_len; 5092 struct kvec *iov = rqst->rq_iov; 5093 int len, rc; 5094 5095 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server, 5096 (void **) &req, &total_len); 5097 if (rc) 5098 return rc; 5099 5100 switch (info_level) { 5101 case SMB_FIND_FILE_DIRECTORY_INFO: 5102 req->FileInformationClass = FILE_DIRECTORY_INFORMATION; 5103 break; 5104 case SMB_FIND_FILE_ID_FULL_DIR_INFO: 5105 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION; 5106 break; 5107 case SMB_FIND_FILE_POSIX_INFO: 5108 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO; 5109 break; 5110 case SMB_FIND_FILE_FULL_DIRECTORY_INFO: 5111 req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION; 5112 break; 5113 default: 5114 cifs_tcon_dbg(VFS, "info level %u isn't supported\n", 5115 info_level); 5116 return -EINVAL; 5117 } 5118 5119 req->FileIndex = cpu_to_le32(index); 5120 req->PersistentFileId = persistent_fid; 5121 req->VolatileFileId = volatile_fid; 5122 5123 len = 0x2; 5124 bufptr = req->Buffer; 5125 memcpy(bufptr, &asteriks, len); 5126 5127 req->FileNameOffset = 5128 cpu_to_le16(sizeof(struct smb2_query_directory_req)); 5129 req->FileNameLength = cpu_to_le16(len); 5130 /* 5131 * BB could be 30 bytes or so longer if we used SMB2 specific 5132 * buffer lengths, but this is safe and close enough. 5133 */ 5134 output_size = min_t(unsigned int, output_size, server->maxBuf); 5135 output_size = min_t(unsigned int, output_size, 2 << 15); 5136 req->OutputBufferLength = cpu_to_le32(output_size); 5137 5138 iov[0].iov_base = (char *)req; 5139 /* 1 for Buffer */ 5140 iov[0].iov_len = total_len - 1; 5141 5142 iov[1].iov_base = (char *)(req->Buffer); 5143 iov[1].iov_len = len; 5144 5145 trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid, 5146 tcon->ses->Suid, index, output_size); 5147 5148 return 0; 5149 } 5150 5151 void SMB2_query_directory_free(struct smb_rqst *rqst) 5152 { 5153 if (rqst && rqst->rq_iov) { 5154 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 5155 } 5156 } 5157 5158 int 5159 smb2_parse_query_directory(struct cifs_tcon *tcon, 5160 struct kvec *rsp_iov, 5161 int resp_buftype, 5162 struct cifs_search_info *srch_inf) 5163 { 5164 struct smb2_query_directory_rsp *rsp; 5165 size_t info_buf_size; 5166 char *end_of_smb; 5167 int rc; 5168 5169 rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base; 5170 5171 switch (srch_inf->info_level) { 5172 case SMB_FIND_FILE_DIRECTORY_INFO: 5173 info_buf_size = sizeof(FILE_DIRECTORY_INFO); 5174 break; 5175 case SMB_FIND_FILE_ID_FULL_DIR_INFO: 5176 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO); 5177 break; 5178 case SMB_FIND_FILE_POSIX_INFO: 5179 /* note that posix payload are variable size */ 5180 info_buf_size = sizeof(struct smb2_posix_info); 5181 break; 5182 case SMB_FIND_FILE_FULL_DIRECTORY_INFO: 5183 info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO); 5184 break; 5185 default: 5186 cifs_tcon_dbg(VFS, "info level %u isn't supported\n", 5187 srch_inf->info_level); 5188 return -EINVAL; 5189 } 5190 5191 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 5192 le32_to_cpu(rsp->OutputBufferLength), rsp_iov, 5193 info_buf_size); 5194 if (rc) { 5195 cifs_tcon_dbg(VFS, "bad info payload"); 5196 return rc; 5197 } 5198 5199 srch_inf->unicode = true; 5200 5201 if (srch_inf->ntwrk_buf_start) { 5202 if (srch_inf->smallBuf) 5203 cifs_small_buf_release(srch_inf->ntwrk_buf_start); 5204 else 5205 cifs_buf_release(srch_inf->ntwrk_buf_start); 5206 } 5207 srch_inf->ntwrk_buf_start = (char *)rsp; 5208 srch_inf->srch_entries_start = srch_inf->last_entry = 5209 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset); 5210 end_of_smb = rsp_iov->iov_len + (char *)rsp; 5211 5212 srch_inf->entries_in_buffer = num_entries( 5213 srch_inf->info_level, 5214 srch_inf->srch_entries_start, 5215 end_of_smb, 5216 &srch_inf->last_entry, 5217 info_buf_size); 5218 5219 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer; 5220 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n", 5221 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry, 5222 srch_inf->srch_entries_start, srch_inf->last_entry); 5223 if (resp_buftype == CIFS_LARGE_BUFFER) 5224 srch_inf->smallBuf = false; 5225 else if (resp_buftype == CIFS_SMALL_BUFFER) 5226 srch_inf->smallBuf = true; 5227 else 5228 cifs_tcon_dbg(VFS, "Invalid search buffer type\n"); 5229 5230 return 0; 5231 } 5232 5233 int 5234 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, 5235 u64 persistent_fid, u64 volatile_fid, int index, 5236 struct cifs_search_info *srch_inf) 5237 { 5238 struct smb_rqst rqst; 5239 struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE]; 5240 struct smb2_query_directory_rsp *rsp = NULL; 5241 int resp_buftype = CIFS_NO_BUFFER; 5242 struct kvec rsp_iov; 5243 int rc = 0; 5244 struct cifs_ses *ses = tcon->ses; 5245 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5246 int flags = 0; 5247 5248 if (!ses || !(ses->server)) 5249 return -EIO; 5250 5251 if (smb3_encryption_required(tcon)) 5252 flags |= CIFS_TRANSFORM_REQ; 5253 5254 memset(&rqst, 0, sizeof(struct smb_rqst)); 5255 memset(&iov, 0, sizeof(iov)); 5256 rqst.rq_iov = iov; 5257 rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE; 5258 5259 rc = SMB2_query_directory_init(xid, tcon, server, 5260 &rqst, persistent_fid, 5261 volatile_fid, index, 5262 srch_inf->info_level); 5263 if (rc) 5264 goto qdir_exit; 5265 5266 rc = cifs_send_recv(xid, ses, server, 5267 &rqst, &resp_buftype, flags, &rsp_iov); 5268 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base; 5269 5270 if (rc) { 5271 if (rc == -ENODATA && 5272 rsp->hdr.Status == STATUS_NO_MORE_FILES) { 5273 trace_smb3_query_dir_done(xid, persistent_fid, 5274 tcon->tid, tcon->ses->Suid, index, 0); 5275 srch_inf->endOfSearch = true; 5276 rc = 0; 5277 } else { 5278 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid, 5279 tcon->ses->Suid, index, 0, rc); 5280 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE); 5281 } 5282 goto qdir_exit; 5283 } 5284 5285 rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype, 5286 srch_inf); 5287 if (rc) { 5288 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid, 5289 tcon->ses->Suid, index, 0, rc); 5290 goto qdir_exit; 5291 } 5292 resp_buftype = CIFS_NO_BUFFER; 5293 5294 trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid, 5295 tcon->ses->Suid, index, srch_inf->entries_in_buffer); 5296 5297 qdir_exit: 5298 SMB2_query_directory_free(&rqst); 5299 free_rsp_buf(resp_buftype, rsp); 5300 return rc; 5301 } 5302 5303 int 5304 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 5305 struct smb_rqst *rqst, 5306 u64 persistent_fid, u64 volatile_fid, u32 pid, 5307 u8 info_class, u8 info_type, u32 additional_info, 5308 void **data, unsigned int *size) 5309 { 5310 struct smb2_set_info_req *req; 5311 struct kvec *iov = rqst->rq_iov; 5312 unsigned int i, total_len; 5313 int rc; 5314 5315 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server, 5316 (void **) &req, &total_len); 5317 if (rc) 5318 return rc; 5319 5320 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid); 5321 req->InfoType = info_type; 5322 req->FileInfoClass = info_class; 5323 req->PersistentFileId = persistent_fid; 5324 req->VolatileFileId = volatile_fid; 5325 req->AdditionalInformation = cpu_to_le32(additional_info); 5326 5327 req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req)); 5328 req->BufferLength = cpu_to_le32(*size); 5329 5330 memcpy(req->Buffer, *data, *size); 5331 total_len += *size; 5332 5333 iov[0].iov_base = (char *)req; 5334 /* 1 for Buffer */ 5335 iov[0].iov_len = total_len - 1; 5336 5337 for (i = 1; i < rqst->rq_nvec; i++) { 5338 le32_add_cpu(&req->BufferLength, size[i]); 5339 iov[i].iov_base = (char *)data[i]; 5340 iov[i].iov_len = size[i]; 5341 } 5342 5343 return 0; 5344 } 5345 5346 void 5347 SMB2_set_info_free(struct smb_rqst *rqst) 5348 { 5349 if (rqst && rqst->rq_iov) 5350 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */ 5351 } 5352 5353 static int 5354 send_set_info(const unsigned int xid, struct cifs_tcon *tcon, 5355 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class, 5356 u8 info_type, u32 additional_info, unsigned int num, 5357 void **data, unsigned int *size) 5358 { 5359 struct smb_rqst rqst; 5360 struct smb2_set_info_rsp *rsp = NULL; 5361 struct kvec *iov; 5362 struct kvec rsp_iov; 5363 int rc = 0; 5364 int resp_buftype; 5365 struct cifs_ses *ses = tcon->ses; 5366 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5367 int flags = 0; 5368 5369 if (!ses || !server) 5370 return -EIO; 5371 5372 if (!num) 5373 return -EINVAL; 5374 5375 if (smb3_encryption_required(tcon)) 5376 flags |= CIFS_TRANSFORM_REQ; 5377 5378 iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL); 5379 if (!iov) 5380 return -ENOMEM; 5381 5382 memset(&rqst, 0, sizeof(struct smb_rqst)); 5383 rqst.rq_iov = iov; 5384 rqst.rq_nvec = num; 5385 5386 rc = SMB2_set_info_init(tcon, server, 5387 &rqst, persistent_fid, volatile_fid, pid, 5388 info_class, info_type, additional_info, 5389 data, size); 5390 if (rc) { 5391 kfree(iov); 5392 return rc; 5393 } 5394 5395 5396 rc = cifs_send_recv(xid, ses, server, 5397 &rqst, &resp_buftype, flags, 5398 &rsp_iov); 5399 SMB2_set_info_free(&rqst); 5400 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base; 5401 5402 if (rc != 0) { 5403 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE); 5404 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid, 5405 ses->Suid, info_class, (__u32)info_type, rc); 5406 } 5407 5408 free_rsp_buf(resp_buftype, rsp); 5409 kfree(iov); 5410 return rc; 5411 } 5412 5413 int 5414 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 5415 u64 volatile_fid, u32 pid, loff_t new_eof) 5416 { 5417 struct smb2_file_eof_info info; 5418 void *data; 5419 unsigned int size; 5420 5421 info.EndOfFile = cpu_to_le64(new_eof); 5422 5423 data = &info; 5424 size = sizeof(struct smb2_file_eof_info); 5425 5426 trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof); 5427 5428 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5429 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE, 5430 0, 1, &data, &size); 5431 } 5432 5433 int 5434 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon, 5435 u64 persistent_fid, u64 volatile_fid, 5436 struct cifs_ntsd *pnntsd, int pacllen, int aclflag) 5437 { 5438 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5439 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag, 5440 1, (void **)&pnntsd, &pacllen); 5441 } 5442 5443 int 5444 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon, 5445 u64 persistent_fid, u64 volatile_fid, 5446 struct smb2_file_full_ea_info *buf, int len) 5447 { 5448 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5449 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 5450 0, 1, (void **)&buf, &len); 5451 } 5452 5453 int 5454 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon, 5455 const u64 persistent_fid, const u64 volatile_fid, 5456 __u8 oplock_level) 5457 { 5458 struct smb_rqst rqst; 5459 int rc; 5460 struct smb2_oplock_break *req = NULL; 5461 struct cifs_ses *ses = tcon->ses; 5462 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5463 int flags = CIFS_OBREAK_OP; 5464 unsigned int total_len; 5465 struct kvec iov[1]; 5466 struct kvec rsp_iov; 5467 int resp_buf_type; 5468 5469 cifs_dbg(FYI, "SMB2_oplock_break\n"); 5470 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server, 5471 (void **) &req, &total_len); 5472 if (rc) 5473 return rc; 5474 5475 if (smb3_encryption_required(tcon)) 5476 flags |= CIFS_TRANSFORM_REQ; 5477 5478 req->VolatileFid = volatile_fid; 5479 req->PersistentFid = persistent_fid; 5480 req->OplockLevel = oplock_level; 5481 req->hdr.CreditRequest = cpu_to_le16(1); 5482 5483 flags |= CIFS_NO_RSP_BUF; 5484 5485 iov[0].iov_base = (char *)req; 5486 iov[0].iov_len = total_len; 5487 5488 memset(&rqst, 0, sizeof(struct smb_rqst)); 5489 rqst.rq_iov = iov; 5490 rqst.rq_nvec = 1; 5491 5492 rc = cifs_send_recv(xid, ses, server, 5493 &rqst, &resp_buf_type, flags, &rsp_iov); 5494 cifs_small_buf_release(req); 5495 5496 if (rc) { 5497 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); 5498 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc); 5499 } 5500 5501 return rc; 5502 } 5503 5504 void 5505 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf, 5506 struct kstatfs *kst) 5507 { 5508 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) * 5509 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit); 5510 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits); 5511 kst->f_bfree = kst->f_bavail = 5512 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits); 5513 return; 5514 } 5515 5516 static void 5517 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data, 5518 struct kstatfs *kst) 5519 { 5520 kst->f_bsize = le32_to_cpu(response_data->BlockSize); 5521 kst->f_blocks = le64_to_cpu(response_data->TotalBlocks); 5522 kst->f_bfree = le64_to_cpu(response_data->BlocksAvail); 5523 if (response_data->UserBlocksAvail == cpu_to_le64(-1)) 5524 kst->f_bavail = kst->f_bfree; 5525 else 5526 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail); 5527 if (response_data->TotalFileNodes != cpu_to_le64(-1)) 5528 kst->f_files = le64_to_cpu(response_data->TotalFileNodes); 5529 if (response_data->FreeFileNodes != cpu_to_le64(-1)) 5530 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes); 5531 5532 return; 5533 } 5534 5535 static int 5536 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, 5537 struct TCP_Server_Info *server, 5538 int level, int outbuf_len, u64 persistent_fid, 5539 u64 volatile_fid) 5540 { 5541 int rc; 5542 struct smb2_query_info_req *req; 5543 unsigned int total_len; 5544 5545 cifs_dbg(FYI, "Query FSInfo level %d\n", level); 5546 5547 if ((tcon->ses == NULL) || server == NULL) 5548 return -EIO; 5549 5550 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server, 5551 (void **) &req, &total_len); 5552 if (rc) 5553 return rc; 5554 5555 req->InfoType = SMB2_O_INFO_FILESYSTEM; 5556 req->FileInfoClass = level; 5557 req->PersistentFileId = persistent_fid; 5558 req->VolatileFileId = volatile_fid; 5559 /* 1 for pad */ 5560 req->InputBufferOffset = 5561 cpu_to_le16(sizeof(struct smb2_query_info_req)); 5562 req->OutputBufferLength = cpu_to_le32( 5563 outbuf_len + sizeof(struct smb2_query_info_rsp)); 5564 5565 iov->iov_base = (char *)req; 5566 iov->iov_len = total_len; 5567 return 0; 5568 } 5569 5570 static inline void free_qfs_info_req(struct kvec *iov) 5571 { 5572 cifs_buf_release(iov->iov_base); 5573 } 5574 5575 int 5576 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon, 5577 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) 5578 { 5579 struct smb_rqst rqst; 5580 struct smb2_query_info_rsp *rsp = NULL; 5581 struct kvec iov; 5582 struct kvec rsp_iov; 5583 int rc = 0; 5584 int resp_buftype; 5585 struct cifs_ses *ses = tcon->ses; 5586 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5587 FILE_SYSTEM_POSIX_INFO *info = NULL; 5588 int flags = 0; 5589 5590 rc = build_qfs_info_req(&iov, tcon, server, 5591 FS_POSIX_INFORMATION, 5592 sizeof(FILE_SYSTEM_POSIX_INFO), 5593 persistent_fid, volatile_fid); 5594 if (rc) 5595 return rc; 5596 5597 if (smb3_encryption_required(tcon)) 5598 flags |= CIFS_TRANSFORM_REQ; 5599 5600 memset(&rqst, 0, sizeof(struct smb_rqst)); 5601 rqst.rq_iov = &iov; 5602 rqst.rq_nvec = 1; 5603 5604 rc = cifs_send_recv(xid, ses, server, 5605 &rqst, &resp_buftype, flags, &rsp_iov); 5606 free_qfs_info_req(&iov); 5607 if (rc) { 5608 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 5609 goto posix_qfsinf_exit; 5610 } 5611 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 5612 5613 info = (FILE_SYSTEM_POSIX_INFO *)( 5614 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp); 5615 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 5616 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, 5617 sizeof(FILE_SYSTEM_POSIX_INFO)); 5618 if (!rc) 5619 copy_posix_fs_info_to_kstatfs(info, fsdata); 5620 5621 posix_qfsinf_exit: 5622 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 5623 return rc; 5624 } 5625 5626 int 5627 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon, 5628 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) 5629 { 5630 struct smb_rqst rqst; 5631 struct smb2_query_info_rsp *rsp = NULL; 5632 struct kvec iov; 5633 struct kvec rsp_iov; 5634 int rc = 0; 5635 int resp_buftype; 5636 struct cifs_ses *ses = tcon->ses; 5637 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5638 struct smb2_fs_full_size_info *info = NULL; 5639 int flags = 0; 5640 5641 rc = build_qfs_info_req(&iov, tcon, server, 5642 FS_FULL_SIZE_INFORMATION, 5643 sizeof(struct smb2_fs_full_size_info), 5644 persistent_fid, volatile_fid); 5645 if (rc) 5646 return rc; 5647 5648 if (smb3_encryption_required(tcon)) 5649 flags |= CIFS_TRANSFORM_REQ; 5650 5651 memset(&rqst, 0, sizeof(struct smb_rqst)); 5652 rqst.rq_iov = &iov; 5653 rqst.rq_nvec = 1; 5654 5655 rc = cifs_send_recv(xid, ses, server, 5656 &rqst, &resp_buftype, flags, &rsp_iov); 5657 free_qfs_info_req(&iov); 5658 if (rc) { 5659 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 5660 goto qfsinf_exit; 5661 } 5662 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 5663 5664 info = (struct smb2_fs_full_size_info *)( 5665 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp); 5666 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 5667 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, 5668 sizeof(struct smb2_fs_full_size_info)); 5669 if (!rc) 5670 smb2_copy_fs_info_to_kstatfs(info, fsdata); 5671 5672 qfsinf_exit: 5673 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 5674 return rc; 5675 } 5676 5677 int 5678 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon, 5679 u64 persistent_fid, u64 volatile_fid, int level) 5680 { 5681 struct smb_rqst rqst; 5682 struct smb2_query_info_rsp *rsp = NULL; 5683 struct kvec iov; 5684 struct kvec rsp_iov; 5685 int rc = 0; 5686 int resp_buftype, max_len, min_len; 5687 struct cifs_ses *ses = tcon->ses; 5688 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5689 unsigned int rsp_len, offset; 5690 int flags = 0; 5691 5692 if (level == FS_DEVICE_INFORMATION) { 5693 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO); 5694 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO); 5695 } else if (level == FS_ATTRIBUTE_INFORMATION) { 5696 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO); 5697 min_len = MIN_FS_ATTR_INFO_SIZE; 5698 } else if (level == FS_SECTOR_SIZE_INFORMATION) { 5699 max_len = sizeof(struct smb3_fs_ss_info); 5700 min_len = sizeof(struct smb3_fs_ss_info); 5701 } else if (level == FS_VOLUME_INFORMATION) { 5702 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN; 5703 min_len = sizeof(struct smb3_fs_vol_info); 5704 } else { 5705 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level); 5706 return -EINVAL; 5707 } 5708 5709 rc = build_qfs_info_req(&iov, tcon, server, 5710 level, max_len, 5711 persistent_fid, volatile_fid); 5712 if (rc) 5713 return rc; 5714 5715 if (smb3_encryption_required(tcon)) 5716 flags |= CIFS_TRANSFORM_REQ; 5717 5718 memset(&rqst, 0, sizeof(struct smb_rqst)); 5719 rqst.rq_iov = &iov; 5720 rqst.rq_nvec = 1; 5721 5722 rc = cifs_send_recv(xid, ses, server, 5723 &rqst, &resp_buftype, flags, &rsp_iov); 5724 free_qfs_info_req(&iov); 5725 if (rc) { 5726 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 5727 goto qfsattr_exit; 5728 } 5729 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 5730 5731 rsp_len = le32_to_cpu(rsp->OutputBufferLength); 5732 offset = le16_to_cpu(rsp->OutputBufferOffset); 5733 rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len); 5734 if (rc) 5735 goto qfsattr_exit; 5736 5737 if (level == FS_ATTRIBUTE_INFORMATION) 5738 memcpy(&tcon->fsAttrInfo, offset 5739 + (char *)rsp, min_t(unsigned int, 5740 rsp_len, max_len)); 5741 else if (level == FS_DEVICE_INFORMATION) 5742 memcpy(&tcon->fsDevInfo, offset 5743 + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO)); 5744 else if (level == FS_SECTOR_SIZE_INFORMATION) { 5745 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *) 5746 (offset + (char *)rsp); 5747 tcon->ss_flags = le32_to_cpu(ss_info->Flags); 5748 tcon->perf_sector_size = 5749 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf); 5750 } else if (level == FS_VOLUME_INFORMATION) { 5751 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *) 5752 (offset + (char *)rsp); 5753 tcon->vol_serial_number = vol_info->VolumeSerialNumber; 5754 tcon->vol_create_time = vol_info->VolumeCreationTime; 5755 } 5756 5757 qfsattr_exit: 5758 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 5759 return rc; 5760 } 5761 5762 int 5763 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon, 5764 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, 5765 const __u32 num_lock, struct smb2_lock_element *buf) 5766 { 5767 struct smb_rqst rqst; 5768 int rc = 0; 5769 struct smb2_lock_req *req = NULL; 5770 struct kvec iov[2]; 5771 struct kvec rsp_iov; 5772 int resp_buf_type; 5773 unsigned int count; 5774 int flags = CIFS_NO_RSP_BUF; 5775 unsigned int total_len; 5776 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses); 5777 5778 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock); 5779 5780 rc = smb2_plain_req_init(SMB2_LOCK, tcon, server, 5781 (void **) &req, &total_len); 5782 if (rc) 5783 return rc; 5784 5785 if (smb3_encryption_required(tcon)) 5786 flags |= CIFS_TRANSFORM_REQ; 5787 5788 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid); 5789 req->LockCount = cpu_to_le16(num_lock); 5790 5791 req->PersistentFileId = persist_fid; 5792 req->VolatileFileId = volatile_fid; 5793 5794 count = num_lock * sizeof(struct smb2_lock_element); 5795 5796 iov[0].iov_base = (char *)req; 5797 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element); 5798 iov[1].iov_base = (char *)buf; 5799 iov[1].iov_len = count; 5800 5801 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks); 5802 5803 memset(&rqst, 0, sizeof(struct smb_rqst)); 5804 rqst.rq_iov = iov; 5805 rqst.rq_nvec = 2; 5806 5807 rc = cifs_send_recv(xid, tcon->ses, server, 5808 &rqst, &resp_buf_type, flags, 5809 &rsp_iov); 5810 cifs_small_buf_release(req); 5811 if (rc) { 5812 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc); 5813 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE); 5814 trace_smb3_lock_err(xid, persist_fid, tcon->tid, 5815 tcon->ses->Suid, rc); 5816 } 5817 5818 return rc; 5819 } 5820 5821 int 5822 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon, 5823 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, 5824 const __u64 length, const __u64 offset, const __u32 lock_flags, 5825 const bool wait) 5826 { 5827 struct smb2_lock_element lock; 5828 5829 lock.Offset = cpu_to_le64(offset); 5830 lock.Length = cpu_to_le64(length); 5831 lock.Flags = cpu_to_le32(lock_flags); 5832 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK) 5833 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY); 5834 5835 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock); 5836 } 5837 5838 int 5839 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon, 5840 __u8 *lease_key, const __le32 lease_state) 5841 { 5842 struct smb_rqst rqst; 5843 int rc; 5844 struct smb2_lease_ack *req = NULL; 5845 struct cifs_ses *ses = tcon->ses; 5846 int flags = CIFS_OBREAK_OP; 5847 unsigned int total_len; 5848 struct kvec iov[1]; 5849 struct kvec rsp_iov; 5850 int resp_buf_type; 5851 __u64 *please_key_high; 5852 __u64 *please_key_low; 5853 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses); 5854 5855 cifs_dbg(FYI, "SMB2_lease_break\n"); 5856 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server, 5857 (void **) &req, &total_len); 5858 if (rc) 5859 return rc; 5860 5861 if (smb3_encryption_required(tcon)) 5862 flags |= CIFS_TRANSFORM_REQ; 5863 5864 req->hdr.CreditRequest = cpu_to_le16(1); 5865 req->StructureSize = cpu_to_le16(36); 5866 total_len += 12; 5867 5868 memcpy(req->LeaseKey, lease_key, 16); 5869 req->LeaseState = lease_state; 5870 5871 flags |= CIFS_NO_RSP_BUF; 5872 5873 iov[0].iov_base = (char *)req; 5874 iov[0].iov_len = total_len; 5875 5876 memset(&rqst, 0, sizeof(struct smb_rqst)); 5877 rqst.rq_iov = iov; 5878 rqst.rq_nvec = 1; 5879 5880 rc = cifs_send_recv(xid, ses, server, 5881 &rqst, &resp_buf_type, flags, &rsp_iov); 5882 cifs_small_buf_release(req); 5883 5884 please_key_low = (__u64 *)lease_key; 5885 please_key_high = (__u64 *)(lease_key+8); 5886 if (rc) { 5887 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); 5888 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid, 5889 ses->Suid, *please_key_low, *please_key_high, rc); 5890 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc); 5891 } else 5892 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid, 5893 ses->Suid, *please_key_low, *please_key_high); 5894 5895 return rc; 5896 } 5897