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; 2023 2024 /* always use master channel */ 2025 server = ses->server; 2026 2027 cifs_dbg(FYI, "TCON\n"); 2028 2029 if (!server || !tree) 2030 return -EIO; 2031 2032 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL); 2033 if (unc_path == NULL) 2034 return -ENOMEM; 2035 2036 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp); 2037 if (unc_path_len <= 0) { 2038 kfree(unc_path); 2039 return -EINVAL; 2040 } 2041 unc_path_len *= 2; 2042 2043 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */ 2044 tcon->tid = 0; 2045 atomic_set(&tcon->num_remote_opens, 0); 2046 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server, 2047 (void **) &req, &total_len); 2048 if (rc) { 2049 kfree(unc_path); 2050 return rc; 2051 } 2052 2053 if (smb3_encryption_required(tcon)) 2054 flags |= CIFS_TRANSFORM_REQ; 2055 2056 iov[0].iov_base = (char *)req; 2057 /* 1 for pad */ 2058 iov[0].iov_len = total_len - 1; 2059 2060 /* Testing shows that buffer offset must be at location of Buffer[0] */ 2061 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)); 2062 req->PathLength = cpu_to_le16(unc_path_len); 2063 iov[1].iov_base = unc_path; 2064 iov[1].iov_len = unc_path_len; 2065 2066 /* 2067 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 2068 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1 2069 * (Samba servers don't always set the flag so also check if null user) 2070 */ 2071 if ((server->dialect == SMB311_PROT_ID) && 2072 !smb3_encryption_required(tcon) && 2073 !(ses->session_flags & 2074 (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) && 2075 ((ses->user_name != NULL) || (ses->sectype == Kerberos))) 2076 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 2077 2078 memset(&rqst, 0, sizeof(struct smb_rqst)); 2079 rqst.rq_iov = iov; 2080 rqst.rq_nvec = 2; 2081 2082 /* Need 64 for max size write so ask for more in case not there yet */ 2083 if (server->credits >= server->max_credits) 2084 req->hdr.CreditRequest = cpu_to_le16(0); 2085 else 2086 req->hdr.CreditRequest = cpu_to_le16( 2087 min_t(int, server->max_credits - 2088 server->credits, 64)); 2089 2090 rc = cifs_send_recv(xid, ses, server, 2091 &rqst, &resp_buftype, flags, &rsp_iov); 2092 cifs_small_buf_release(req); 2093 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base; 2094 trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc); 2095 if ((rc != 0) || (rsp == NULL)) { 2096 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE); 2097 tcon->need_reconnect = true; 2098 goto tcon_error_exit; 2099 } 2100 2101 switch (rsp->ShareType) { 2102 case SMB2_SHARE_TYPE_DISK: 2103 cifs_dbg(FYI, "connection to disk share\n"); 2104 break; 2105 case SMB2_SHARE_TYPE_PIPE: 2106 tcon->pipe = true; 2107 cifs_dbg(FYI, "connection to pipe share\n"); 2108 break; 2109 case SMB2_SHARE_TYPE_PRINT: 2110 tcon->print = true; 2111 cifs_dbg(FYI, "connection to printer\n"); 2112 break; 2113 default: 2114 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType); 2115 rc = -EOPNOTSUPP; 2116 goto tcon_error_exit; 2117 } 2118 2119 tcon->share_flags = le32_to_cpu(rsp->ShareFlags); 2120 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */ 2121 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess); 2122 tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId); 2123 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name)); 2124 2125 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) && 2126 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0)) 2127 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n"); 2128 2129 if (tcon->seal && 2130 !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 2131 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n"); 2132 2133 init_copy_chunk_defaults(tcon); 2134 if (server->ops->validate_negotiate) 2135 rc = server->ops->validate_negotiate(xid, tcon); 2136 if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */ 2137 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT) 2138 server->nosharesock = true; 2139 tcon_exit: 2140 2141 free_rsp_buf(resp_buftype, rsp); 2142 kfree(unc_path); 2143 return rc; 2144 2145 tcon_error_exit: 2146 if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) 2147 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree); 2148 goto tcon_exit; 2149 } 2150 2151 int 2152 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon) 2153 { 2154 struct smb_rqst rqst; 2155 struct smb2_tree_disconnect_req *req; /* response is trivial */ 2156 int rc = 0; 2157 struct cifs_ses *ses = tcon->ses; 2158 int flags = 0; 2159 unsigned int total_len; 2160 struct kvec iov[1]; 2161 struct kvec rsp_iov; 2162 int resp_buf_type; 2163 2164 cifs_dbg(FYI, "Tree Disconnect\n"); 2165 2166 if (!ses || !(ses->server)) 2167 return -EIO; 2168 2169 trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name); 2170 spin_lock(&ses->chan_lock); 2171 if ((tcon->need_reconnect) || 2172 (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) { 2173 spin_unlock(&ses->chan_lock); 2174 return 0; 2175 } 2176 spin_unlock(&ses->chan_lock); 2177 2178 invalidate_all_cached_dirs(tcon); 2179 2180 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server, 2181 (void **) &req, 2182 &total_len); 2183 if (rc) 2184 return rc; 2185 2186 if (smb3_encryption_required(tcon)) 2187 flags |= CIFS_TRANSFORM_REQ; 2188 2189 flags |= CIFS_NO_RSP_BUF; 2190 2191 iov[0].iov_base = (char *)req; 2192 iov[0].iov_len = total_len; 2193 2194 memset(&rqst, 0, sizeof(struct smb_rqst)); 2195 rqst.rq_iov = iov; 2196 rqst.rq_nvec = 1; 2197 2198 rc = cifs_send_recv(xid, ses, ses->server, 2199 &rqst, &resp_buf_type, flags, &rsp_iov); 2200 cifs_small_buf_release(req); 2201 if (rc) { 2202 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE); 2203 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc); 2204 } 2205 trace_smb3_tdis_done(xid, tcon->tid, ses->Suid); 2206 2207 return rc; 2208 } 2209 2210 2211 static struct create_durable * 2212 create_durable_buf(void) 2213 { 2214 struct create_durable *buf; 2215 2216 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL); 2217 if (!buf) 2218 return NULL; 2219 2220 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2221 (struct create_durable, Data)); 2222 buf->ccontext.DataLength = cpu_to_le32(16); 2223 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2224 (struct create_durable, Name)); 2225 buf->ccontext.NameLength = cpu_to_le16(4); 2226 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */ 2227 buf->Name[0] = 'D'; 2228 buf->Name[1] = 'H'; 2229 buf->Name[2] = 'n'; 2230 buf->Name[3] = 'Q'; 2231 return buf; 2232 } 2233 2234 static struct create_durable * 2235 create_reconnect_durable_buf(struct cifs_fid *fid) 2236 { 2237 struct create_durable *buf; 2238 2239 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL); 2240 if (!buf) 2241 return NULL; 2242 2243 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2244 (struct create_durable, Data)); 2245 buf->ccontext.DataLength = cpu_to_le32(16); 2246 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2247 (struct create_durable, Name)); 2248 buf->ccontext.NameLength = cpu_to_le16(4); 2249 buf->Data.Fid.PersistentFileId = fid->persistent_fid; 2250 buf->Data.Fid.VolatileFileId = fid->volatile_fid; 2251 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */ 2252 buf->Name[0] = 'D'; 2253 buf->Name[1] = 'H'; 2254 buf->Name[2] = 'n'; 2255 buf->Name[3] = 'C'; 2256 return buf; 2257 } 2258 2259 static void 2260 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf) 2261 { 2262 struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc; 2263 2264 cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n", 2265 pdisk_id->DiskFileId, pdisk_id->VolumeId); 2266 buf->IndexNumber = pdisk_id->DiskFileId; 2267 } 2268 2269 static void 2270 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info, 2271 struct create_posix_rsp *posix) 2272 { 2273 int sid_len; 2274 u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset); 2275 u8 *end = beg + le32_to_cpu(cc->DataLength); 2276 u8 *sid; 2277 2278 memset(posix, 0, sizeof(*posix)); 2279 2280 posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0)); 2281 posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4)); 2282 posix->mode = le32_to_cpu(*(__le32 *)(beg + 8)); 2283 2284 sid = beg + 12; 2285 sid_len = posix_info_sid_size(sid, end); 2286 if (sid_len < 0) { 2287 cifs_dbg(VFS, "bad owner sid in posix create response\n"); 2288 return; 2289 } 2290 memcpy(&posix->owner, sid, sid_len); 2291 2292 sid = sid + sid_len; 2293 sid_len = posix_info_sid_size(sid, end); 2294 if (sid_len < 0) { 2295 cifs_dbg(VFS, "bad group sid in posix create response\n"); 2296 return; 2297 } 2298 memcpy(&posix->group, sid, sid_len); 2299 2300 cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n", 2301 posix->nlink, posix->mode, posix->reparse_tag); 2302 } 2303 2304 int smb2_parse_contexts(struct TCP_Server_Info *server, 2305 struct kvec *rsp_iov, 2306 unsigned int *epoch, 2307 char *lease_key, __u8 *oplock, 2308 struct smb2_file_all_info *buf, 2309 struct create_posix_rsp *posix) 2310 { 2311 struct smb2_create_rsp *rsp = rsp_iov->iov_base; 2312 struct create_context *cc; 2313 size_t rem, off, len; 2314 size_t doff, dlen; 2315 size_t noff, nlen; 2316 char *name; 2317 static const char smb3_create_tag_posix[] = { 2318 0x93, 0xAD, 0x25, 0x50, 0x9C, 2319 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83, 2320 0xDE, 0x96, 0x8B, 0xCD, 0x7C 2321 }; 2322 2323 *oplock = 0; 2324 2325 off = le32_to_cpu(rsp->CreateContextsOffset); 2326 rem = le32_to_cpu(rsp->CreateContextsLength); 2327 if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len) 2328 return -EINVAL; 2329 cc = (struct create_context *)((u8 *)rsp + off); 2330 2331 /* Initialize inode number to 0 in case no valid data in qfid context */ 2332 if (buf) 2333 buf->IndexNumber = 0; 2334 2335 while (rem >= sizeof(*cc)) { 2336 doff = le16_to_cpu(cc->DataOffset); 2337 dlen = le32_to_cpu(cc->DataLength); 2338 if (check_add_overflow(doff, dlen, &len) || len > rem) 2339 return -EINVAL; 2340 2341 noff = le16_to_cpu(cc->NameOffset); 2342 nlen = le16_to_cpu(cc->NameLength); 2343 if (noff + nlen > doff) 2344 return -EINVAL; 2345 2346 name = (char *)cc + noff; 2347 switch (nlen) { 2348 case 4: 2349 if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) { 2350 *oplock = server->ops->parse_lease_buf(cc, epoch, 2351 lease_key); 2352 } else if (buf && 2353 !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) { 2354 parse_query_id_ctxt(cc, buf); 2355 } 2356 break; 2357 case 16: 2358 if (posix && !memcmp(name, smb3_create_tag_posix, 16)) 2359 parse_posix_ctxt(cc, buf, posix); 2360 break; 2361 default: 2362 cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n", 2363 __func__, nlen, dlen); 2364 if (IS_ENABLED(CONFIG_CIFS_DEBUG2)) 2365 cifs_dump_mem("context data: ", cc, dlen); 2366 break; 2367 } 2368 2369 off = le32_to_cpu(cc->Next); 2370 if (!off) 2371 break; 2372 if (check_sub_overflow(rem, off, &rem)) 2373 return -EINVAL; 2374 cc = (struct create_context *)((u8 *)cc + off); 2375 } 2376 2377 if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE) 2378 *oplock = rsp->OplockLevel; 2379 2380 return 0; 2381 } 2382 2383 static int 2384 add_lease_context(struct TCP_Server_Info *server, 2385 struct smb2_create_req *req, 2386 struct kvec *iov, 2387 unsigned int *num_iovec, u8 *lease_key, __u8 *oplock) 2388 { 2389 unsigned int num = *num_iovec; 2390 2391 iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock); 2392 if (iov[num].iov_base == NULL) 2393 return -ENOMEM; 2394 iov[num].iov_len = server->vals->create_lease_size; 2395 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE; 2396 *num_iovec = num + 1; 2397 return 0; 2398 } 2399 2400 static struct create_durable_v2 * 2401 create_durable_v2_buf(struct cifs_open_parms *oparms) 2402 { 2403 struct cifs_fid *pfid = oparms->fid; 2404 struct create_durable_v2 *buf; 2405 2406 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL); 2407 if (!buf) 2408 return NULL; 2409 2410 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2411 (struct create_durable_v2, dcontext)); 2412 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2)); 2413 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2414 (struct create_durable_v2, Name)); 2415 buf->ccontext.NameLength = cpu_to_le16(4); 2416 2417 /* 2418 * NB: Handle timeout defaults to 0, which allows server to choose 2419 * (most servers default to 120 seconds) and most clients default to 0. 2420 * This can be overridden at mount ("handletimeout=") if the user wants 2421 * a different persistent (or resilient) handle timeout for all opens 2422 * on a particular SMB3 mount. 2423 */ 2424 buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout); 2425 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); 2426 generate_random_uuid(buf->dcontext.CreateGuid); 2427 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16); 2428 2429 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */ 2430 buf->Name[0] = 'D'; 2431 buf->Name[1] = 'H'; 2432 buf->Name[2] = '2'; 2433 buf->Name[3] = 'Q'; 2434 return buf; 2435 } 2436 2437 static struct create_durable_handle_reconnect_v2 * 2438 create_reconnect_durable_v2_buf(struct cifs_fid *fid) 2439 { 2440 struct create_durable_handle_reconnect_v2 *buf; 2441 2442 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2), 2443 GFP_KERNEL); 2444 if (!buf) 2445 return NULL; 2446 2447 buf->ccontext.DataOffset = 2448 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, 2449 dcontext)); 2450 buf->ccontext.DataLength = 2451 cpu_to_le32(sizeof(struct durable_reconnect_context_v2)); 2452 buf->ccontext.NameOffset = 2453 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, 2454 Name)); 2455 buf->ccontext.NameLength = cpu_to_le16(4); 2456 2457 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid; 2458 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid; 2459 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); 2460 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16); 2461 2462 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */ 2463 buf->Name[0] = 'D'; 2464 buf->Name[1] = 'H'; 2465 buf->Name[2] = '2'; 2466 buf->Name[3] = 'C'; 2467 return buf; 2468 } 2469 2470 static int 2471 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec, 2472 struct cifs_open_parms *oparms) 2473 { 2474 unsigned int num = *num_iovec; 2475 2476 iov[num].iov_base = create_durable_v2_buf(oparms); 2477 if (iov[num].iov_base == NULL) 2478 return -ENOMEM; 2479 iov[num].iov_len = sizeof(struct create_durable_v2); 2480 *num_iovec = num + 1; 2481 return 0; 2482 } 2483 2484 static int 2485 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec, 2486 struct cifs_open_parms *oparms) 2487 { 2488 unsigned int num = *num_iovec; 2489 2490 /* indicate that we don't need to relock the file */ 2491 oparms->reconnect = false; 2492 2493 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid); 2494 if (iov[num].iov_base == NULL) 2495 return -ENOMEM; 2496 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2); 2497 *num_iovec = num + 1; 2498 return 0; 2499 } 2500 2501 static int 2502 add_durable_context(struct kvec *iov, unsigned int *num_iovec, 2503 struct cifs_open_parms *oparms, bool use_persistent) 2504 { 2505 unsigned int num = *num_iovec; 2506 2507 if (use_persistent) { 2508 if (oparms->reconnect) 2509 return add_durable_reconnect_v2_context(iov, num_iovec, 2510 oparms); 2511 else 2512 return add_durable_v2_context(iov, num_iovec, oparms); 2513 } 2514 2515 if (oparms->reconnect) { 2516 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid); 2517 /* indicate that we don't need to relock the file */ 2518 oparms->reconnect = false; 2519 } else 2520 iov[num].iov_base = create_durable_buf(); 2521 if (iov[num].iov_base == NULL) 2522 return -ENOMEM; 2523 iov[num].iov_len = sizeof(struct create_durable); 2524 *num_iovec = num + 1; 2525 return 0; 2526 } 2527 2528 /* See MS-SMB2 2.2.13.2.7 */ 2529 static struct crt_twarp_ctxt * 2530 create_twarp_buf(__u64 timewarp) 2531 { 2532 struct crt_twarp_ctxt *buf; 2533 2534 buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL); 2535 if (!buf) 2536 return NULL; 2537 2538 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2539 (struct crt_twarp_ctxt, Timestamp)); 2540 buf->ccontext.DataLength = cpu_to_le32(8); 2541 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2542 (struct crt_twarp_ctxt, Name)); 2543 buf->ccontext.NameLength = cpu_to_le16(4); 2544 /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */ 2545 buf->Name[0] = 'T'; 2546 buf->Name[1] = 'W'; 2547 buf->Name[2] = 'r'; 2548 buf->Name[3] = 'p'; 2549 buf->Timestamp = cpu_to_le64(timewarp); 2550 return buf; 2551 } 2552 2553 /* See MS-SMB2 2.2.13.2.7 */ 2554 static int 2555 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp) 2556 { 2557 unsigned int num = *num_iovec; 2558 2559 iov[num].iov_base = create_twarp_buf(timewarp); 2560 if (iov[num].iov_base == NULL) 2561 return -ENOMEM; 2562 iov[num].iov_len = sizeof(struct crt_twarp_ctxt); 2563 *num_iovec = num + 1; 2564 return 0; 2565 } 2566 2567 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */ 2568 static void setup_owner_group_sids(char *buf) 2569 { 2570 struct owner_group_sids *sids = (struct owner_group_sids *)buf; 2571 2572 /* Populate the user ownership fields S-1-5-88-1 */ 2573 sids->owner.Revision = 1; 2574 sids->owner.NumAuth = 3; 2575 sids->owner.Authority[5] = 5; 2576 sids->owner.SubAuthorities[0] = cpu_to_le32(88); 2577 sids->owner.SubAuthorities[1] = cpu_to_le32(1); 2578 sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val); 2579 2580 /* Populate the group ownership fields S-1-5-88-2 */ 2581 sids->group.Revision = 1; 2582 sids->group.NumAuth = 3; 2583 sids->group.Authority[5] = 5; 2584 sids->group.SubAuthorities[0] = cpu_to_le32(88); 2585 sids->group.SubAuthorities[1] = cpu_to_le32(2); 2586 sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val); 2587 2588 cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val); 2589 } 2590 2591 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */ 2592 static struct crt_sd_ctxt * 2593 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len) 2594 { 2595 struct crt_sd_ctxt *buf; 2596 __u8 *ptr, *aclptr; 2597 unsigned int acelen, acl_size, ace_count; 2598 unsigned int owner_offset = 0; 2599 unsigned int group_offset = 0; 2600 struct smb3_acl acl = {}; 2601 2602 *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8); 2603 2604 if (set_owner) { 2605 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */ 2606 *len += sizeof(struct owner_group_sids); 2607 } 2608 2609 buf = kzalloc(*len, GFP_KERNEL); 2610 if (buf == NULL) 2611 return buf; 2612 2613 ptr = (__u8 *)&buf[1]; 2614 if (set_owner) { 2615 /* offset fields are from beginning of security descriptor not of create context */ 2616 owner_offset = ptr - (__u8 *)&buf->sd; 2617 buf->sd.OffsetOwner = cpu_to_le32(owner_offset); 2618 group_offset = owner_offset + offsetof(struct owner_group_sids, group); 2619 buf->sd.OffsetGroup = cpu_to_le32(group_offset); 2620 2621 setup_owner_group_sids(ptr); 2622 ptr += sizeof(struct owner_group_sids); 2623 } else { 2624 buf->sd.OffsetOwner = 0; 2625 buf->sd.OffsetGroup = 0; 2626 } 2627 2628 buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd)); 2629 buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name)); 2630 buf->ccontext.NameLength = cpu_to_le16(4); 2631 /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */ 2632 buf->Name[0] = 'S'; 2633 buf->Name[1] = 'e'; 2634 buf->Name[2] = 'c'; 2635 buf->Name[3] = 'D'; 2636 buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */ 2637 2638 /* 2639 * ACL is "self relative" ie ACL is stored in contiguous block of memory 2640 * and "DP" ie the DACL is present 2641 */ 2642 buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP); 2643 2644 /* offset owner, group and Sbz1 and SACL are all zero */ 2645 buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd); 2646 /* Ship the ACL for now. we will copy it into buf later. */ 2647 aclptr = ptr; 2648 ptr += sizeof(struct smb3_acl); 2649 2650 /* create one ACE to hold the mode embedded in reserved special SID */ 2651 acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode); 2652 ptr += acelen; 2653 acl_size = acelen + sizeof(struct smb3_acl); 2654 ace_count = 1; 2655 2656 if (set_owner) { 2657 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */ 2658 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr); 2659 ptr += acelen; 2660 acl_size += acelen; 2661 ace_count += 1; 2662 } 2663 2664 /* and one more ACE to allow access for authenticated users */ 2665 acelen = setup_authusers_ACE((struct cifs_ace *)ptr); 2666 ptr += acelen; 2667 acl_size += acelen; 2668 ace_count += 1; 2669 2670 acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */ 2671 acl.AclSize = cpu_to_le16(acl_size); 2672 acl.AceCount = cpu_to_le16(ace_count); 2673 /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */ 2674 memcpy(aclptr, &acl, sizeof(struct smb3_acl)); 2675 2676 buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd); 2677 *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8); 2678 2679 return buf; 2680 } 2681 2682 static int 2683 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner) 2684 { 2685 unsigned int num = *num_iovec; 2686 unsigned int len = 0; 2687 2688 iov[num].iov_base = create_sd_buf(mode, set_owner, &len); 2689 if (iov[num].iov_base == NULL) 2690 return -ENOMEM; 2691 iov[num].iov_len = len; 2692 *num_iovec = num + 1; 2693 return 0; 2694 } 2695 2696 static struct crt_query_id_ctxt * 2697 create_query_id_buf(void) 2698 { 2699 struct crt_query_id_ctxt *buf; 2700 2701 buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL); 2702 if (!buf) 2703 return NULL; 2704 2705 buf->ccontext.DataOffset = cpu_to_le16(0); 2706 buf->ccontext.DataLength = cpu_to_le32(0); 2707 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2708 (struct crt_query_id_ctxt, Name)); 2709 buf->ccontext.NameLength = cpu_to_le16(4); 2710 /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */ 2711 buf->Name[0] = 'Q'; 2712 buf->Name[1] = 'F'; 2713 buf->Name[2] = 'i'; 2714 buf->Name[3] = 'd'; 2715 return buf; 2716 } 2717 2718 /* See MS-SMB2 2.2.13.2.9 */ 2719 static int 2720 add_query_id_context(struct kvec *iov, unsigned int *num_iovec) 2721 { 2722 unsigned int num = *num_iovec; 2723 2724 iov[num].iov_base = create_query_id_buf(); 2725 if (iov[num].iov_base == NULL) 2726 return -ENOMEM; 2727 iov[num].iov_len = sizeof(struct crt_query_id_ctxt); 2728 *num_iovec = num + 1; 2729 return 0; 2730 } 2731 2732 static int 2733 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len, 2734 const char *treename, const __le16 *path) 2735 { 2736 int treename_len, path_len; 2737 struct nls_table *cp; 2738 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)}; 2739 2740 /* 2741 * skip leading "\\" 2742 */ 2743 treename_len = strlen(treename); 2744 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\')) 2745 return -EINVAL; 2746 2747 treename += 2; 2748 treename_len -= 2; 2749 2750 path_len = UniStrnlen((wchar_t *)path, PATH_MAX); 2751 2752 /* make room for one path separator only if @path isn't empty */ 2753 *out_len = treename_len + (path[0] ? 1 : 0) + path_len; 2754 2755 /* 2756 * final path needs to be 8-byte aligned as specified in 2757 * MS-SMB2 2.2.13 SMB2 CREATE Request. 2758 */ 2759 *out_size = round_up(*out_len * sizeof(__le16), 8); 2760 *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL); 2761 if (!*out_path) 2762 return -ENOMEM; 2763 2764 cp = load_nls_default(); 2765 cifs_strtoUTF16(*out_path, treename, treename_len, cp); 2766 2767 /* Do not append the separator if the path is empty */ 2768 if (path[0] != cpu_to_le16(0x0000)) { 2769 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep); 2770 UniStrcat((wchar_t *)*out_path, (wchar_t *)path); 2771 } 2772 2773 unload_nls(cp); 2774 2775 return 0; 2776 } 2777 2778 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode, 2779 umode_t mode, struct cifs_tcon *tcon, 2780 const char *full_path, 2781 struct cifs_sb_info *cifs_sb) 2782 { 2783 struct smb_rqst rqst; 2784 struct smb2_create_req *req; 2785 struct smb2_create_rsp *rsp = NULL; 2786 struct cifs_ses *ses = tcon->ses; 2787 struct kvec iov[3]; /* make sure at least one for each open context */ 2788 struct kvec rsp_iov = {NULL, 0}; 2789 int resp_buftype; 2790 int uni_path_len; 2791 __le16 *copy_path = NULL; 2792 int copy_size; 2793 int rc = 0; 2794 unsigned int n_iov = 2; 2795 __u32 file_attributes = 0; 2796 char *pc_buf = NULL; 2797 int flags = 0; 2798 unsigned int total_len; 2799 __le16 *utf16_path = NULL; 2800 struct TCP_Server_Info *server = cifs_pick_channel(ses); 2801 2802 cifs_dbg(FYI, "mkdir\n"); 2803 2804 /* resource #1: path allocation */ 2805 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb); 2806 if (!utf16_path) 2807 return -ENOMEM; 2808 2809 if (!ses || !server) { 2810 rc = -EIO; 2811 goto err_free_path; 2812 } 2813 2814 /* resource #2: request */ 2815 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server, 2816 (void **) &req, &total_len); 2817 if (rc) 2818 goto err_free_path; 2819 2820 2821 if (smb3_encryption_required(tcon)) 2822 flags |= CIFS_TRANSFORM_REQ; 2823 2824 req->ImpersonationLevel = IL_IMPERSONATION; 2825 req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES); 2826 /* File attributes ignored on open (used in create though) */ 2827 req->FileAttributes = cpu_to_le32(file_attributes); 2828 req->ShareAccess = FILE_SHARE_ALL_LE; 2829 req->CreateDisposition = cpu_to_le32(FILE_CREATE); 2830 req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE); 2831 2832 iov[0].iov_base = (char *)req; 2833 /* -1 since last byte is buf[0] which is sent below (path) */ 2834 iov[0].iov_len = total_len - 1; 2835 2836 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); 2837 2838 /* [MS-SMB2] 2.2.13 NameOffset: 2839 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of 2840 * the SMB2 header, the file name includes a prefix that will 2841 * be processed during DFS name normalization as specified in 2842 * section 3.3.5.9. Otherwise, the file name is relative to 2843 * the share that is identified by the TreeId in the SMB2 2844 * header. 2845 */ 2846 if (tcon->share_flags & SHI1005_FLAGS_DFS) { 2847 int name_len; 2848 2849 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; 2850 rc = alloc_path_with_tree_prefix(©_path, ©_size, 2851 &name_len, 2852 tcon->tree_name, utf16_path); 2853 if (rc) 2854 goto err_free_req; 2855 2856 req->NameLength = cpu_to_le16(name_len * 2); 2857 uni_path_len = copy_size; 2858 /* free before overwriting resource */ 2859 kfree(utf16_path); 2860 utf16_path = copy_path; 2861 } else { 2862 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2; 2863 /* MUST set path len (NameLength) to 0 opening root of share */ 2864 req->NameLength = cpu_to_le16(uni_path_len - 2); 2865 if (uni_path_len % 8 != 0) { 2866 copy_size = roundup(uni_path_len, 8); 2867 copy_path = kzalloc(copy_size, GFP_KERNEL); 2868 if (!copy_path) { 2869 rc = -ENOMEM; 2870 goto err_free_req; 2871 } 2872 memcpy((char *)copy_path, (const char *)utf16_path, 2873 uni_path_len); 2874 uni_path_len = copy_size; 2875 /* free before overwriting resource */ 2876 kfree(utf16_path); 2877 utf16_path = copy_path; 2878 } 2879 } 2880 2881 iov[1].iov_len = uni_path_len; 2882 iov[1].iov_base = utf16_path; 2883 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE; 2884 2885 if (tcon->posix_extensions) { 2886 /* resource #3: posix buf */ 2887 rc = add_posix_context(iov, &n_iov, mode); 2888 if (rc) 2889 goto err_free_req; 2890 req->CreateContextsOffset = cpu_to_le32( 2891 sizeof(struct smb2_create_req) + 2892 iov[1].iov_len); 2893 pc_buf = iov[n_iov-1].iov_base; 2894 } 2895 2896 2897 memset(&rqst, 0, sizeof(struct smb_rqst)); 2898 rqst.rq_iov = iov; 2899 rqst.rq_nvec = n_iov; 2900 2901 /* no need to inc num_remote_opens because we close it just below */ 2902 trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE, 2903 FILE_WRITE_ATTRIBUTES); 2904 /* resource #4: response buffer */ 2905 rc = cifs_send_recv(xid, ses, server, 2906 &rqst, &resp_buftype, flags, &rsp_iov); 2907 if (rc) { 2908 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); 2909 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid, 2910 CREATE_NOT_FILE, 2911 FILE_WRITE_ATTRIBUTES, rc); 2912 goto err_free_rsp_buf; 2913 } 2914 2915 /* 2916 * Although unlikely to be possible for rsp to be null and rc not set, 2917 * adding check below is slightly safer long term (and quiets Coverity 2918 * warning) 2919 */ 2920 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; 2921 if (rsp == NULL) { 2922 rc = -EIO; 2923 kfree(pc_buf); 2924 goto err_free_req; 2925 } 2926 2927 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid, 2928 CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES); 2929 2930 SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId); 2931 2932 /* Eventually save off posix specific response info and timestaps */ 2933 2934 err_free_rsp_buf: 2935 free_rsp_buf(resp_buftype, rsp); 2936 kfree(pc_buf); 2937 err_free_req: 2938 cifs_small_buf_release(req); 2939 err_free_path: 2940 kfree(utf16_path); 2941 return rc; 2942 } 2943 2944 int 2945 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 2946 struct smb_rqst *rqst, __u8 *oplock, 2947 struct cifs_open_parms *oparms, __le16 *path) 2948 { 2949 struct smb2_create_req *req; 2950 unsigned int n_iov = 2; 2951 __u32 file_attributes = 0; 2952 int copy_size; 2953 int uni_path_len; 2954 unsigned int total_len; 2955 struct kvec *iov = rqst->rq_iov; 2956 __le16 *copy_path; 2957 int rc; 2958 2959 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server, 2960 (void **) &req, &total_len); 2961 if (rc) 2962 return rc; 2963 2964 iov[0].iov_base = (char *)req; 2965 /* -1 since last byte is buf[0] which is sent below (path) */ 2966 iov[0].iov_len = total_len - 1; 2967 2968 if (oparms->create_options & CREATE_OPTION_READONLY) 2969 file_attributes |= ATTR_READONLY; 2970 if (oparms->create_options & CREATE_OPTION_SPECIAL) 2971 file_attributes |= ATTR_SYSTEM; 2972 2973 req->ImpersonationLevel = IL_IMPERSONATION; 2974 req->DesiredAccess = cpu_to_le32(oparms->desired_access); 2975 /* File attributes ignored on open (used in create though) */ 2976 req->FileAttributes = cpu_to_le32(file_attributes); 2977 req->ShareAccess = FILE_SHARE_ALL_LE; 2978 2979 req->CreateDisposition = cpu_to_le32(oparms->disposition); 2980 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK); 2981 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); 2982 2983 /* [MS-SMB2] 2.2.13 NameOffset: 2984 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of 2985 * the SMB2 header, the file name includes a prefix that will 2986 * be processed during DFS name normalization as specified in 2987 * section 3.3.5.9. Otherwise, the file name is relative to 2988 * the share that is identified by the TreeId in the SMB2 2989 * header. 2990 */ 2991 if (tcon->share_flags & SHI1005_FLAGS_DFS) { 2992 int name_len; 2993 2994 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; 2995 rc = alloc_path_with_tree_prefix(©_path, ©_size, 2996 &name_len, 2997 tcon->tree_name, path); 2998 if (rc) 2999 return rc; 3000 req->NameLength = cpu_to_le16(name_len * 2); 3001 uni_path_len = copy_size; 3002 path = copy_path; 3003 } else { 3004 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2; 3005 /* MUST set path len (NameLength) to 0 opening root of share */ 3006 req->NameLength = cpu_to_le16(uni_path_len - 2); 3007 copy_size = round_up(uni_path_len, 8); 3008 copy_path = kzalloc(copy_size, GFP_KERNEL); 3009 if (!copy_path) 3010 return -ENOMEM; 3011 memcpy((char *)copy_path, (const char *)path, 3012 uni_path_len); 3013 uni_path_len = copy_size; 3014 path = copy_path; 3015 } 3016 3017 iov[1].iov_len = uni_path_len; 3018 iov[1].iov_base = path; 3019 3020 if ((!server->oplocks) || (tcon->no_lease)) 3021 *oplock = SMB2_OPLOCK_LEVEL_NONE; 3022 3023 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) || 3024 *oplock == SMB2_OPLOCK_LEVEL_NONE) 3025 req->RequestedOplockLevel = *oplock; 3026 else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) && 3027 (oparms->create_options & CREATE_NOT_FILE)) 3028 req->RequestedOplockLevel = *oplock; /* no srv lease support */ 3029 else { 3030 rc = add_lease_context(server, req, iov, &n_iov, 3031 oparms->fid->lease_key, oplock); 3032 if (rc) 3033 return rc; 3034 } 3035 3036 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) { 3037 rc = add_durable_context(iov, &n_iov, oparms, 3038 tcon->use_persistent); 3039 if (rc) 3040 return rc; 3041 } 3042 3043 if (tcon->posix_extensions) { 3044 rc = add_posix_context(iov, &n_iov, oparms->mode); 3045 if (rc) 3046 return rc; 3047 } 3048 3049 if (tcon->snapshot_time) { 3050 cifs_dbg(FYI, "adding snapshot context\n"); 3051 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time); 3052 if (rc) 3053 return rc; 3054 } 3055 3056 if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) { 3057 bool set_mode; 3058 bool set_owner; 3059 3060 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) && 3061 (oparms->mode != ACL_NO_MODE)) 3062 set_mode = true; 3063 else { 3064 set_mode = false; 3065 oparms->mode = ACL_NO_MODE; 3066 } 3067 3068 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL) 3069 set_owner = true; 3070 else 3071 set_owner = false; 3072 3073 if (set_owner | set_mode) { 3074 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode); 3075 rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner); 3076 if (rc) 3077 return rc; 3078 } 3079 } 3080 3081 add_query_id_context(iov, &n_iov); 3082 3083 if (n_iov > 2) { 3084 /* 3085 * We have create contexts behind iov[1] (the file 3086 * name), point at them from the main create request 3087 */ 3088 req->CreateContextsOffset = cpu_to_le32( 3089 sizeof(struct smb2_create_req) + 3090 iov[1].iov_len); 3091 req->CreateContextsLength = 0; 3092 3093 for (unsigned int i = 2; i < (n_iov-1); i++) { 3094 struct kvec *v = &iov[i]; 3095 size_t len = v->iov_len; 3096 struct create_context *cctx = 3097 (struct create_context *)v->iov_base; 3098 3099 cctx->Next = cpu_to_le32(len); 3100 le32_add_cpu(&req->CreateContextsLength, len); 3101 } 3102 le32_add_cpu(&req->CreateContextsLength, 3103 iov[n_iov-1].iov_len); 3104 } 3105 3106 rqst->rq_nvec = n_iov; 3107 return 0; 3108 } 3109 3110 /* rq_iov[0] is the request and is released by cifs_small_buf_release(). 3111 * All other vectors are freed by kfree(). 3112 */ 3113 void 3114 SMB2_open_free(struct smb_rqst *rqst) 3115 { 3116 int i; 3117 3118 if (rqst && rqst->rq_iov) { 3119 cifs_small_buf_release(rqst->rq_iov[0].iov_base); 3120 for (i = 1; i < rqst->rq_nvec; i++) 3121 if (rqst->rq_iov[i].iov_base != smb2_padding) 3122 kfree(rqst->rq_iov[i].iov_base); 3123 } 3124 } 3125 3126 int 3127 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path, 3128 __u8 *oplock, struct smb2_file_all_info *buf, 3129 struct create_posix_rsp *posix, 3130 struct kvec *err_iov, int *buftype) 3131 { 3132 struct smb_rqst rqst; 3133 struct smb2_create_rsp *rsp = NULL; 3134 struct cifs_tcon *tcon = oparms->tcon; 3135 struct cifs_ses *ses = tcon->ses; 3136 struct TCP_Server_Info *server = cifs_pick_channel(ses); 3137 struct kvec iov[SMB2_CREATE_IOV_SIZE]; 3138 struct kvec rsp_iov = {NULL, 0}; 3139 int resp_buftype = CIFS_NO_BUFFER; 3140 int rc = 0; 3141 int flags = 0; 3142 3143 cifs_dbg(FYI, "create/open\n"); 3144 if (!ses || !server) 3145 return -EIO; 3146 3147 if (smb3_encryption_required(tcon)) 3148 flags |= CIFS_TRANSFORM_REQ; 3149 3150 memset(&rqst, 0, sizeof(struct smb_rqst)); 3151 memset(&iov, 0, sizeof(iov)); 3152 rqst.rq_iov = iov; 3153 rqst.rq_nvec = SMB2_CREATE_IOV_SIZE; 3154 3155 rc = SMB2_open_init(tcon, server, 3156 &rqst, oplock, oparms, path); 3157 if (rc) 3158 goto creat_exit; 3159 3160 trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path, 3161 oparms->create_options, oparms->desired_access); 3162 3163 rc = cifs_send_recv(xid, ses, server, 3164 &rqst, &resp_buftype, flags, 3165 &rsp_iov); 3166 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; 3167 3168 if (rc != 0) { 3169 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); 3170 if (err_iov && rsp) { 3171 *err_iov = rsp_iov; 3172 *buftype = resp_buftype; 3173 resp_buftype = CIFS_NO_BUFFER; 3174 rsp = NULL; 3175 } 3176 trace_smb3_open_err(xid, tcon->tid, ses->Suid, 3177 oparms->create_options, oparms->desired_access, rc); 3178 if (rc == -EREMCHG) { 3179 pr_warn_once("server share %s deleted\n", 3180 tcon->tree_name); 3181 tcon->need_reconnect = true; 3182 } 3183 goto creat_exit; 3184 } else if (rsp == NULL) /* unlikely to happen, but safer to check */ 3185 goto creat_exit; 3186 else 3187 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid, 3188 oparms->create_options, oparms->desired_access); 3189 3190 atomic_inc(&tcon->num_remote_opens); 3191 oparms->fid->persistent_fid = rsp->PersistentFileId; 3192 oparms->fid->volatile_fid = rsp->VolatileFileId; 3193 oparms->fid->access = oparms->desired_access; 3194 #ifdef CONFIG_CIFS_DEBUG2 3195 oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId); 3196 #endif /* CIFS_DEBUG2 */ 3197 3198 if (buf) { 3199 buf->CreationTime = rsp->CreationTime; 3200 buf->LastAccessTime = rsp->LastAccessTime; 3201 buf->LastWriteTime = rsp->LastWriteTime; 3202 buf->ChangeTime = rsp->ChangeTime; 3203 buf->AllocationSize = rsp->AllocationSize; 3204 buf->EndOfFile = rsp->EndofFile; 3205 buf->Attributes = rsp->FileAttributes; 3206 buf->NumberOfLinks = cpu_to_le32(1); 3207 buf->DeletePending = 0; 3208 } 3209 3210 3211 rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch, 3212 oparms->fid->lease_key, oplock, buf, posix); 3213 creat_exit: 3214 SMB2_open_free(&rqst); 3215 free_rsp_buf(resp_buftype, rsp); 3216 return rc; 3217 } 3218 3219 int 3220 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3221 struct smb_rqst *rqst, 3222 u64 persistent_fid, u64 volatile_fid, u32 opcode, 3223 char *in_data, u32 indatalen, 3224 __u32 max_response_size) 3225 { 3226 struct smb2_ioctl_req *req; 3227 struct kvec *iov = rqst->rq_iov; 3228 unsigned int total_len; 3229 int rc; 3230 char *in_data_buf; 3231 3232 rc = smb2_ioctl_req_init(opcode, tcon, server, 3233 (void **) &req, &total_len); 3234 if (rc) 3235 return rc; 3236 3237 if (indatalen) { 3238 /* 3239 * indatalen is usually small at a couple of bytes max, so 3240 * just allocate through generic pool 3241 */ 3242 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS); 3243 if (!in_data_buf) { 3244 cifs_small_buf_release(req); 3245 return -ENOMEM; 3246 } 3247 } 3248 3249 req->CtlCode = cpu_to_le32(opcode); 3250 req->PersistentFileId = persistent_fid; 3251 req->VolatileFileId = volatile_fid; 3252 3253 iov[0].iov_base = (char *)req; 3254 /* 3255 * If no input data, the size of ioctl struct in 3256 * protocol spec still includes a 1 byte data buffer, 3257 * but if input data passed to ioctl, we do not 3258 * want to double count this, so we do not send 3259 * the dummy one byte of data in iovec[0] if sending 3260 * input data (in iovec[1]). 3261 */ 3262 if (indatalen) { 3263 req->InputCount = cpu_to_le32(indatalen); 3264 /* do not set InputOffset if no input data */ 3265 req->InputOffset = 3266 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer)); 3267 rqst->rq_nvec = 2; 3268 iov[0].iov_len = total_len - 1; 3269 iov[1].iov_base = in_data_buf; 3270 iov[1].iov_len = indatalen; 3271 } else { 3272 rqst->rq_nvec = 1; 3273 iov[0].iov_len = total_len; 3274 } 3275 3276 req->OutputOffset = 0; 3277 req->OutputCount = 0; /* MBZ */ 3278 3279 /* 3280 * In most cases max_response_size is set to 16K (CIFSMaxBufSize) 3281 * We Could increase default MaxOutputResponse, but that could require 3282 * more credits. Windows typically sets this smaller, but for some 3283 * ioctls it may be useful to allow server to send more. No point 3284 * limiting what the server can send as long as fits in one credit 3285 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want 3286 * to increase this limit up in the future. 3287 * Note that for snapshot queries that servers like Azure expect that 3288 * the first query be minimal size (and just used to get the number/size 3289 * of previous versions) so response size must be specified as EXACTLY 3290 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple 3291 * of eight bytes. Currently that is the only case where we set max 3292 * response size smaller. 3293 */ 3294 req->MaxOutputResponse = cpu_to_le32(max_response_size); 3295 req->hdr.CreditCharge = 3296 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size), 3297 SMB2_MAX_BUFFER_SIZE)); 3298 /* always an FSCTL (for now) */ 3299 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL); 3300 3301 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */ 3302 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) 3303 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 3304 3305 return 0; 3306 } 3307 3308 void 3309 SMB2_ioctl_free(struct smb_rqst *rqst) 3310 { 3311 int i; 3312 3313 if (rqst && rqst->rq_iov) { 3314 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3315 for (i = 1; i < rqst->rq_nvec; i++) 3316 if (rqst->rq_iov[i].iov_base != smb2_padding) 3317 kfree(rqst->rq_iov[i].iov_base); 3318 } 3319 } 3320 3321 3322 /* 3323 * SMB2 IOCTL is used for both IOCTLs and FSCTLs 3324 */ 3325 int 3326 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 3327 u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen, 3328 u32 max_out_data_len, char **out_data, 3329 u32 *plen /* returned data len */) 3330 { 3331 struct smb_rqst rqst; 3332 struct smb2_ioctl_rsp *rsp = NULL; 3333 struct cifs_ses *ses; 3334 struct TCP_Server_Info *server; 3335 struct kvec iov[SMB2_IOCTL_IOV_SIZE]; 3336 struct kvec rsp_iov = {NULL, 0}; 3337 int resp_buftype = CIFS_NO_BUFFER; 3338 int rc = 0; 3339 int flags = 0; 3340 3341 cifs_dbg(FYI, "SMB2 IOCTL\n"); 3342 3343 if (out_data != NULL) 3344 *out_data = NULL; 3345 3346 /* zero out returned data len, in case of error */ 3347 if (plen) 3348 *plen = 0; 3349 3350 if (!tcon) 3351 return -EIO; 3352 3353 ses = tcon->ses; 3354 if (!ses) 3355 return -EIO; 3356 3357 server = cifs_pick_channel(ses); 3358 if (!server) 3359 return -EIO; 3360 3361 if (smb3_encryption_required(tcon)) 3362 flags |= CIFS_TRANSFORM_REQ; 3363 3364 memset(&rqst, 0, sizeof(struct smb_rqst)); 3365 memset(&iov, 0, sizeof(iov)); 3366 rqst.rq_iov = iov; 3367 rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE; 3368 3369 rc = SMB2_ioctl_init(tcon, server, 3370 &rqst, persistent_fid, volatile_fid, opcode, 3371 in_data, indatalen, max_out_data_len); 3372 if (rc) 3373 goto ioctl_exit; 3374 3375 rc = cifs_send_recv(xid, ses, server, 3376 &rqst, &resp_buftype, flags, 3377 &rsp_iov); 3378 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base; 3379 3380 if (rc != 0) 3381 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid, 3382 ses->Suid, 0, opcode, rc); 3383 3384 if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) { 3385 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3386 goto ioctl_exit; 3387 } else if (rc == -EINVAL) { 3388 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) && 3389 (opcode != FSCTL_SRV_COPYCHUNK)) { 3390 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3391 goto ioctl_exit; 3392 } 3393 } else if (rc == -E2BIG) { 3394 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) { 3395 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3396 goto ioctl_exit; 3397 } 3398 } 3399 3400 /* check if caller wants to look at return data or just return rc */ 3401 if ((plen == NULL) || (out_data == NULL)) 3402 goto ioctl_exit; 3403 3404 /* 3405 * Although unlikely to be possible for rsp to be null and rc not set, 3406 * adding check below is slightly safer long term (and quiets Coverity 3407 * warning) 3408 */ 3409 if (rsp == NULL) { 3410 rc = -EIO; 3411 goto ioctl_exit; 3412 } 3413 3414 *plen = le32_to_cpu(rsp->OutputCount); 3415 3416 /* We check for obvious errors in the output buffer length and offset */ 3417 if (*plen == 0) 3418 goto ioctl_exit; /* server returned no data */ 3419 else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) { 3420 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen); 3421 *plen = 0; 3422 rc = -EIO; 3423 goto ioctl_exit; 3424 } 3425 3426 if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) { 3427 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen, 3428 le32_to_cpu(rsp->OutputOffset)); 3429 *plen = 0; 3430 rc = -EIO; 3431 goto ioctl_exit; 3432 } 3433 3434 *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset), 3435 *plen, GFP_KERNEL); 3436 if (*out_data == NULL) { 3437 rc = -ENOMEM; 3438 goto ioctl_exit; 3439 } 3440 3441 ioctl_exit: 3442 SMB2_ioctl_free(&rqst); 3443 free_rsp_buf(resp_buftype, rsp); 3444 return rc; 3445 } 3446 3447 /* 3448 * Individual callers to ioctl worker function follow 3449 */ 3450 3451 int 3452 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon, 3453 u64 persistent_fid, u64 volatile_fid) 3454 { 3455 int rc; 3456 struct compress_ioctl fsctl_input; 3457 char *ret_data = NULL; 3458 3459 fsctl_input.CompressionState = 3460 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT); 3461 3462 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid, 3463 FSCTL_SET_COMPRESSION, 3464 (char *)&fsctl_input /* data input */, 3465 2 /* in data len */, CIFSMaxBufSize /* max out data */, 3466 &ret_data /* out data */, NULL); 3467 3468 cifs_dbg(FYI, "set compression rc %d\n", rc); 3469 3470 return rc; 3471 } 3472 3473 int 3474 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3475 struct smb_rqst *rqst, 3476 u64 persistent_fid, u64 volatile_fid, bool query_attrs) 3477 { 3478 struct smb2_close_req *req; 3479 struct kvec *iov = rqst->rq_iov; 3480 unsigned int total_len; 3481 int rc; 3482 3483 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server, 3484 (void **) &req, &total_len); 3485 if (rc) 3486 return rc; 3487 3488 req->PersistentFileId = persistent_fid; 3489 req->VolatileFileId = volatile_fid; 3490 if (query_attrs) 3491 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB; 3492 else 3493 req->Flags = 0; 3494 iov[0].iov_base = (char *)req; 3495 iov[0].iov_len = total_len; 3496 3497 return 0; 3498 } 3499 3500 void 3501 SMB2_close_free(struct smb_rqst *rqst) 3502 { 3503 if (rqst && rqst->rq_iov) 3504 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3505 } 3506 3507 int 3508 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, 3509 u64 persistent_fid, u64 volatile_fid, 3510 struct smb2_file_network_open_info *pbuf) 3511 { 3512 struct smb_rqst rqst; 3513 struct smb2_close_rsp *rsp = NULL; 3514 struct cifs_ses *ses = tcon->ses; 3515 struct TCP_Server_Info *server = cifs_pick_channel(ses); 3516 struct kvec iov[1]; 3517 struct kvec rsp_iov; 3518 int resp_buftype = CIFS_NO_BUFFER; 3519 int rc = 0; 3520 int flags = 0; 3521 bool query_attrs = false; 3522 3523 cifs_dbg(FYI, "Close\n"); 3524 3525 if (!ses || !server) 3526 return -EIO; 3527 3528 if (smb3_encryption_required(tcon)) 3529 flags |= CIFS_TRANSFORM_REQ; 3530 3531 memset(&rqst, 0, sizeof(struct smb_rqst)); 3532 memset(&iov, 0, sizeof(iov)); 3533 rqst.rq_iov = iov; 3534 rqst.rq_nvec = 1; 3535 3536 /* check if need to ask server to return timestamps in close response */ 3537 if (pbuf) 3538 query_attrs = true; 3539 3540 trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid); 3541 rc = SMB2_close_init(tcon, server, 3542 &rqst, persistent_fid, volatile_fid, 3543 query_attrs); 3544 if (rc) 3545 goto close_exit; 3546 3547 rc = cifs_send_recv(xid, ses, server, 3548 &rqst, &resp_buftype, flags, &rsp_iov); 3549 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base; 3550 3551 if (rc != 0) { 3552 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE); 3553 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid, 3554 rc); 3555 goto close_exit; 3556 } else { 3557 trace_smb3_close_done(xid, persistent_fid, tcon->tid, 3558 ses->Suid); 3559 if (pbuf) 3560 memcpy(&pbuf->network_open_info, 3561 &rsp->network_open_info, 3562 sizeof(pbuf->network_open_info)); 3563 atomic_dec(&tcon->num_remote_opens); 3564 } 3565 3566 close_exit: 3567 SMB2_close_free(&rqst); 3568 free_rsp_buf(resp_buftype, rsp); 3569 3570 /* retry close in a worker thread if this one is interrupted */ 3571 if (is_interrupt_error(rc)) { 3572 int tmp_rc; 3573 3574 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid, 3575 volatile_fid); 3576 if (tmp_rc) 3577 cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n", 3578 persistent_fid, tmp_rc); 3579 } 3580 return rc; 3581 } 3582 3583 int 3584 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, 3585 u64 persistent_fid, u64 volatile_fid) 3586 { 3587 return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL); 3588 } 3589 3590 int 3591 smb2_validate_iov(unsigned int offset, unsigned int buffer_length, 3592 struct kvec *iov, unsigned int min_buf_size) 3593 { 3594 unsigned int smb_len = iov->iov_len; 3595 char *end_of_smb = smb_len + (char *)iov->iov_base; 3596 char *begin_of_buf = offset + (char *)iov->iov_base; 3597 char *end_of_buf = begin_of_buf + buffer_length; 3598 3599 3600 if (buffer_length < min_buf_size) { 3601 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n", 3602 buffer_length, min_buf_size); 3603 return -EINVAL; 3604 } 3605 3606 /* check if beyond RFC1001 maximum length */ 3607 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) { 3608 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n", 3609 buffer_length, smb_len); 3610 return -EINVAL; 3611 } 3612 3613 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) { 3614 cifs_dbg(VFS, "Invalid server response, bad offset to data\n"); 3615 return -EINVAL; 3616 } 3617 3618 return 0; 3619 } 3620 3621 /* 3622 * If SMB buffer fields are valid, copy into temporary buffer to hold result. 3623 * Caller must free buffer. 3624 */ 3625 int 3626 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length, 3627 struct kvec *iov, unsigned int minbufsize, 3628 char *data) 3629 { 3630 char *begin_of_buf = offset + (char *)iov->iov_base; 3631 int rc; 3632 3633 if (!data) 3634 return -EINVAL; 3635 3636 rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize); 3637 if (rc) 3638 return rc; 3639 3640 memcpy(data, begin_of_buf, minbufsize); 3641 3642 return 0; 3643 } 3644 3645 int 3646 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3647 struct smb_rqst *rqst, 3648 u64 persistent_fid, u64 volatile_fid, 3649 u8 info_class, u8 info_type, u32 additional_info, 3650 size_t output_len, size_t input_len, void *input) 3651 { 3652 struct smb2_query_info_req *req; 3653 struct kvec *iov = rqst->rq_iov; 3654 unsigned int total_len; 3655 size_t len; 3656 int rc; 3657 3658 if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) || 3659 len > CIFSMaxBufSize)) 3660 return -EINVAL; 3661 3662 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server, 3663 (void **) &req, &total_len); 3664 if (rc) 3665 return rc; 3666 3667 req->InfoType = info_type; 3668 req->FileInfoClass = info_class; 3669 req->PersistentFileId = persistent_fid; 3670 req->VolatileFileId = volatile_fid; 3671 req->AdditionalInformation = cpu_to_le32(additional_info); 3672 3673 req->OutputBufferLength = cpu_to_le32(output_len); 3674 if (input_len) { 3675 req->InputBufferLength = cpu_to_le32(input_len); 3676 /* total_len for smb query request never close to le16 max */ 3677 req->InputBufferOffset = cpu_to_le16(total_len - 1); 3678 memcpy(req->Buffer, input, input_len); 3679 } 3680 3681 iov[0].iov_base = (char *)req; 3682 /* 1 for Buffer */ 3683 iov[0].iov_len = len; 3684 return 0; 3685 } 3686 3687 void 3688 SMB2_query_info_free(struct smb_rqst *rqst) 3689 { 3690 if (rqst && rqst->rq_iov) 3691 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3692 } 3693 3694 static int 3695 query_info(const unsigned int xid, struct cifs_tcon *tcon, 3696 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type, 3697 u32 additional_info, size_t output_len, size_t min_len, void **data, 3698 u32 *dlen) 3699 { 3700 struct smb_rqst rqst; 3701 struct smb2_query_info_rsp *rsp = NULL; 3702 struct kvec iov[1]; 3703 struct kvec rsp_iov; 3704 int rc = 0; 3705 int resp_buftype = CIFS_NO_BUFFER; 3706 struct cifs_ses *ses = tcon->ses; 3707 struct TCP_Server_Info *server; 3708 int flags = 0; 3709 bool allocated = false; 3710 3711 cifs_dbg(FYI, "Query Info\n"); 3712 3713 if (!ses) 3714 return -EIO; 3715 server = cifs_pick_channel(ses); 3716 if (!server) 3717 return -EIO; 3718 3719 if (smb3_encryption_required(tcon)) 3720 flags |= CIFS_TRANSFORM_REQ; 3721 3722 memset(&rqst, 0, sizeof(struct smb_rqst)); 3723 memset(&iov, 0, sizeof(iov)); 3724 rqst.rq_iov = iov; 3725 rqst.rq_nvec = 1; 3726 3727 rc = SMB2_query_info_init(tcon, server, 3728 &rqst, persistent_fid, volatile_fid, 3729 info_class, info_type, additional_info, 3730 output_len, 0, NULL); 3731 if (rc) 3732 goto qinf_exit; 3733 3734 trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid, 3735 ses->Suid, info_class, (__u32)info_type); 3736 3737 rc = cifs_send_recv(xid, ses, server, 3738 &rqst, &resp_buftype, flags, &rsp_iov); 3739 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 3740 3741 if (rc) { 3742 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 3743 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid, 3744 ses->Suid, info_class, (__u32)info_type, rc); 3745 goto qinf_exit; 3746 } 3747 3748 trace_smb3_query_info_done(xid, persistent_fid, tcon->tid, 3749 ses->Suid, info_class, (__u32)info_type); 3750 3751 if (dlen) { 3752 *dlen = le32_to_cpu(rsp->OutputBufferLength); 3753 if (!*data) { 3754 *data = kmalloc(*dlen, GFP_KERNEL); 3755 if (!*data) { 3756 cifs_tcon_dbg(VFS, 3757 "Error %d allocating memory for acl\n", 3758 rc); 3759 *dlen = 0; 3760 rc = -ENOMEM; 3761 goto qinf_exit; 3762 } 3763 allocated = true; 3764 } 3765 } 3766 3767 rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset), 3768 le32_to_cpu(rsp->OutputBufferLength), 3769 &rsp_iov, dlen ? *dlen : min_len, *data); 3770 if (rc && allocated) { 3771 kfree(*data); 3772 *data = NULL; 3773 *dlen = 0; 3774 } 3775 3776 qinf_exit: 3777 SMB2_query_info_free(&rqst); 3778 free_rsp_buf(resp_buftype, rsp); 3779 return rc; 3780 } 3781 3782 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon, 3783 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data) 3784 { 3785 return query_info(xid, tcon, persistent_fid, volatile_fid, 3786 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0, 3787 sizeof(struct smb2_file_all_info) + PATH_MAX * 2, 3788 sizeof(struct smb2_file_all_info), (void **)&data, 3789 NULL); 3790 } 3791 3792 #if 0 3793 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */ 3794 int 3795 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon, 3796 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen) 3797 { 3798 size_t output_len = sizeof(struct smb311_posix_qinfo *) + 3799 (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2); 3800 *plen = 0; 3801 3802 return query_info(xid, tcon, persistent_fid, volatile_fid, 3803 SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0, 3804 output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen); 3805 /* Note caller must free "data" (passed in above). It may be allocated in query_info call */ 3806 } 3807 #endif 3808 3809 int 3810 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon, 3811 u64 persistent_fid, u64 volatile_fid, 3812 void **data, u32 *plen, u32 extra_info) 3813 { 3814 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO | 3815 extra_info; 3816 *plen = 0; 3817 3818 return query_info(xid, tcon, persistent_fid, volatile_fid, 3819 0, SMB2_O_INFO_SECURITY, additional_info, 3820 SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen); 3821 } 3822 3823 int 3824 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon, 3825 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid) 3826 { 3827 return query_info(xid, tcon, persistent_fid, volatile_fid, 3828 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0, 3829 sizeof(struct smb2_file_internal_info), 3830 sizeof(struct smb2_file_internal_info), 3831 (void **)&uniqueid, NULL); 3832 } 3833 3834 /* 3835 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory 3836 * See MS-SMB2 2.2.35 and 2.2.36 3837 */ 3838 3839 static int 3840 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst, 3841 struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3842 u64 persistent_fid, u64 volatile_fid, 3843 u32 completion_filter, bool watch_tree) 3844 { 3845 struct smb2_change_notify_req *req; 3846 struct kvec *iov = rqst->rq_iov; 3847 unsigned int total_len; 3848 int rc; 3849 3850 rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server, 3851 (void **) &req, &total_len); 3852 if (rc) 3853 return rc; 3854 3855 req->PersistentFileId = persistent_fid; 3856 req->VolatileFileId = volatile_fid; 3857 /* See note 354 of MS-SMB2, 64K max */ 3858 req->OutputBufferLength = 3859 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE); 3860 req->CompletionFilter = cpu_to_le32(completion_filter); 3861 if (watch_tree) 3862 req->Flags = cpu_to_le16(SMB2_WATCH_TREE); 3863 else 3864 req->Flags = 0; 3865 3866 iov[0].iov_base = (char *)req; 3867 iov[0].iov_len = total_len; 3868 3869 return 0; 3870 } 3871 3872 int 3873 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon, 3874 u64 persistent_fid, u64 volatile_fid, bool watch_tree, 3875 u32 completion_filter, u32 max_out_data_len, char **out_data, 3876 u32 *plen /* returned data len */) 3877 { 3878 struct cifs_ses *ses = tcon->ses; 3879 struct TCP_Server_Info *server = cifs_pick_channel(ses); 3880 struct smb_rqst rqst; 3881 struct smb2_change_notify_rsp *smb_rsp; 3882 struct kvec iov[1]; 3883 struct kvec rsp_iov = {NULL, 0}; 3884 int resp_buftype = CIFS_NO_BUFFER; 3885 int flags = 0; 3886 int rc = 0; 3887 3888 cifs_dbg(FYI, "change notify\n"); 3889 if (!ses || !server) 3890 return -EIO; 3891 3892 if (smb3_encryption_required(tcon)) 3893 flags |= CIFS_TRANSFORM_REQ; 3894 3895 memset(&rqst, 0, sizeof(struct smb_rqst)); 3896 memset(&iov, 0, sizeof(iov)); 3897 if (plen) 3898 *plen = 0; 3899 3900 rqst.rq_iov = iov; 3901 rqst.rq_nvec = 1; 3902 3903 rc = SMB2_notify_init(xid, &rqst, tcon, server, 3904 persistent_fid, volatile_fid, 3905 completion_filter, watch_tree); 3906 if (rc) 3907 goto cnotify_exit; 3908 3909 trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid, 3910 (u8)watch_tree, completion_filter); 3911 rc = cifs_send_recv(xid, ses, server, 3912 &rqst, &resp_buftype, flags, &rsp_iov); 3913 3914 if (rc != 0) { 3915 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE); 3916 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid, 3917 (u8)watch_tree, completion_filter, rc); 3918 } else { 3919 trace_smb3_notify_done(xid, persistent_fid, tcon->tid, 3920 ses->Suid, (u8)watch_tree, completion_filter); 3921 /* validate that notify information is plausible */ 3922 if ((rsp_iov.iov_base == NULL) || 3923 (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1)) 3924 goto cnotify_exit; 3925 3926 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base; 3927 3928 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset), 3929 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov, 3930 sizeof(struct file_notify_information)); 3931 3932 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset), 3933 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL); 3934 if (*out_data == NULL) { 3935 rc = -ENOMEM; 3936 goto cnotify_exit; 3937 } else if (plen) 3938 *plen = le32_to_cpu(smb_rsp->OutputBufferLength); 3939 } 3940 3941 cnotify_exit: 3942 if (rqst.rq_iov) 3943 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */ 3944 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 3945 return rc; 3946 } 3947 3948 3949 3950 /* 3951 * This is a no-op for now. We're not really interested in the reply, but 3952 * rather in the fact that the server sent one and that server->lstrp 3953 * gets updated. 3954 * 3955 * FIXME: maybe we should consider checking that the reply matches request? 3956 */ 3957 static void 3958 smb2_echo_callback(struct mid_q_entry *mid) 3959 { 3960 struct TCP_Server_Info *server = mid->callback_data; 3961 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf; 3962 struct cifs_credits credits = { .value = 0, .instance = 0 }; 3963 3964 if (mid->mid_state == MID_RESPONSE_RECEIVED 3965 || mid->mid_state == MID_RESPONSE_MALFORMED) { 3966 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 3967 credits.instance = server->reconnect_instance; 3968 } 3969 3970 release_mid(mid); 3971 add_credits(server, &credits, CIFS_ECHO_OP); 3972 } 3973 3974 void smb2_reconnect_server(struct work_struct *work) 3975 { 3976 struct TCP_Server_Info *server = container_of(work, 3977 struct TCP_Server_Info, reconnect.work); 3978 struct TCP_Server_Info *pserver; 3979 struct cifs_ses *ses, *ses2; 3980 struct cifs_tcon *tcon, *tcon2; 3981 struct list_head tmp_list, tmp_ses_list; 3982 bool tcon_exist = false, ses_exist = false; 3983 bool tcon_selected = false; 3984 int rc; 3985 bool resched = false; 3986 3987 /* first check if ref count has reached 0, if not inc ref count */ 3988 spin_lock(&cifs_tcp_ses_lock); 3989 if (!server->srv_count) { 3990 spin_unlock(&cifs_tcp_ses_lock); 3991 return; 3992 } 3993 server->srv_count++; 3994 spin_unlock(&cifs_tcp_ses_lock); 3995 3996 /* If server is a channel, select the primary channel */ 3997 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 3998 3999 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */ 4000 mutex_lock(&pserver->reconnect_mutex); 4001 4002 /* if the server is marked for termination, drop the ref count here */ 4003 if (server->terminate) { 4004 cifs_put_tcp_session(server, true); 4005 mutex_unlock(&pserver->reconnect_mutex); 4006 return; 4007 } 4008 4009 INIT_LIST_HEAD(&tmp_list); 4010 INIT_LIST_HEAD(&tmp_ses_list); 4011 cifs_dbg(FYI, "Reconnecting tcons and channels\n"); 4012 4013 spin_lock(&cifs_tcp_ses_lock); 4014 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { 4015 spin_lock(&ses->ses_lock); 4016 if (ses->ses_status == SES_EXITING) { 4017 spin_unlock(&ses->ses_lock); 4018 continue; 4019 } 4020 spin_unlock(&ses->ses_lock); 4021 4022 tcon_selected = false; 4023 4024 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { 4025 if (tcon->need_reconnect || tcon->need_reopen_files) { 4026 tcon->tc_count++; 4027 list_add_tail(&tcon->rlist, &tmp_list); 4028 tcon_selected = tcon_exist = true; 4029 } 4030 } 4031 /* 4032 * IPC has the same lifetime as its session and uses its 4033 * refcount. 4034 */ 4035 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) { 4036 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list); 4037 tcon_selected = tcon_exist = true; 4038 cifs_smb_ses_inc_refcount(ses); 4039 } 4040 /* 4041 * handle the case where channel needs to reconnect 4042 * binding session, but tcon is healthy (some other channel 4043 * is active) 4044 */ 4045 spin_lock(&ses->chan_lock); 4046 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) { 4047 list_add_tail(&ses->rlist, &tmp_ses_list); 4048 ses_exist = true; 4049 cifs_smb_ses_inc_refcount(ses); 4050 } 4051 spin_unlock(&ses->chan_lock); 4052 } 4053 spin_unlock(&cifs_tcp_ses_lock); 4054 4055 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) { 4056 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true); 4057 if (!rc) 4058 cifs_reopen_persistent_handles(tcon); 4059 else 4060 resched = true; 4061 list_del_init(&tcon->rlist); 4062 if (tcon->ipc) 4063 cifs_put_smb_ses(tcon->ses); 4064 else 4065 cifs_put_tcon(tcon); 4066 } 4067 4068 if (!ses_exist) 4069 goto done; 4070 4071 /* allocate a dummy tcon struct used for reconnect */ 4072 tcon = tcon_info_alloc(false); 4073 if (!tcon) { 4074 resched = true; 4075 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) { 4076 list_del_init(&ses->rlist); 4077 cifs_put_smb_ses(ses); 4078 } 4079 goto done; 4080 } 4081 4082 tcon->status = TID_GOOD; 4083 tcon->retry = false; 4084 tcon->need_reconnect = false; 4085 4086 /* now reconnect sessions for necessary channels */ 4087 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) { 4088 tcon->ses = ses; 4089 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true); 4090 if (rc) 4091 resched = true; 4092 list_del_init(&ses->rlist); 4093 cifs_put_smb_ses(ses); 4094 } 4095 tconInfoFree(tcon); 4096 4097 done: 4098 cifs_dbg(FYI, "Reconnecting tcons and channels finished\n"); 4099 if (resched) 4100 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ); 4101 mutex_unlock(&pserver->reconnect_mutex); 4102 4103 /* now we can safely release srv struct */ 4104 cifs_put_tcp_session(server, true); 4105 } 4106 4107 int 4108 SMB2_echo(struct TCP_Server_Info *server) 4109 { 4110 struct smb2_echo_req *req; 4111 int rc = 0; 4112 struct kvec iov[1]; 4113 struct smb_rqst rqst = { .rq_iov = iov, 4114 .rq_nvec = 1 }; 4115 unsigned int total_len; 4116 4117 cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id); 4118 4119 spin_lock(&server->srv_lock); 4120 if (server->ops->need_neg && 4121 server->ops->need_neg(server)) { 4122 spin_unlock(&server->srv_lock); 4123 /* No need to send echo on newly established connections */ 4124 mod_delayed_work(cifsiod_wq, &server->reconnect, 0); 4125 return rc; 4126 } 4127 spin_unlock(&server->srv_lock); 4128 4129 rc = smb2_plain_req_init(SMB2_ECHO, NULL, server, 4130 (void **)&req, &total_len); 4131 if (rc) 4132 return rc; 4133 4134 req->hdr.CreditRequest = cpu_to_le16(1); 4135 4136 iov[0].iov_len = total_len; 4137 iov[0].iov_base = (char *)req; 4138 4139 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL, 4140 server, CIFS_ECHO_OP, NULL); 4141 if (rc) 4142 cifs_dbg(FYI, "Echo request failed: %d\n", rc); 4143 4144 cifs_small_buf_release(req); 4145 return rc; 4146 } 4147 4148 void 4149 SMB2_flush_free(struct smb_rqst *rqst) 4150 { 4151 if (rqst && rqst->rq_iov) 4152 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 4153 } 4154 4155 int 4156 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst, 4157 struct cifs_tcon *tcon, struct TCP_Server_Info *server, 4158 u64 persistent_fid, u64 volatile_fid) 4159 { 4160 struct smb2_flush_req *req; 4161 struct kvec *iov = rqst->rq_iov; 4162 unsigned int total_len; 4163 int rc; 4164 4165 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server, 4166 (void **) &req, &total_len); 4167 if (rc) 4168 return rc; 4169 4170 req->PersistentFileId = persistent_fid; 4171 req->VolatileFileId = volatile_fid; 4172 4173 iov[0].iov_base = (char *)req; 4174 iov[0].iov_len = total_len; 4175 4176 return 0; 4177 } 4178 4179 int 4180 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 4181 u64 volatile_fid) 4182 { 4183 struct cifs_ses *ses = tcon->ses; 4184 struct smb_rqst rqst; 4185 struct kvec iov[1]; 4186 struct kvec rsp_iov = {NULL, 0}; 4187 struct TCP_Server_Info *server = cifs_pick_channel(ses); 4188 int resp_buftype = CIFS_NO_BUFFER; 4189 int flags = 0; 4190 int rc = 0; 4191 4192 cifs_dbg(FYI, "flush\n"); 4193 if (!ses || !(ses->server)) 4194 return -EIO; 4195 4196 if (smb3_encryption_required(tcon)) 4197 flags |= CIFS_TRANSFORM_REQ; 4198 4199 memset(&rqst, 0, sizeof(struct smb_rqst)); 4200 memset(&iov, 0, sizeof(iov)); 4201 rqst.rq_iov = iov; 4202 rqst.rq_nvec = 1; 4203 4204 rc = SMB2_flush_init(xid, &rqst, tcon, server, 4205 persistent_fid, volatile_fid); 4206 if (rc) 4207 goto flush_exit; 4208 4209 trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid); 4210 rc = cifs_send_recv(xid, ses, server, 4211 &rqst, &resp_buftype, flags, &rsp_iov); 4212 4213 if (rc != 0) { 4214 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE); 4215 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid, 4216 rc); 4217 } else 4218 trace_smb3_flush_done(xid, persistent_fid, tcon->tid, 4219 ses->Suid); 4220 4221 flush_exit: 4222 SMB2_flush_free(&rqst); 4223 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4224 return rc; 4225 } 4226 4227 #ifdef CONFIG_CIFS_SMB_DIRECT 4228 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms) 4229 { 4230 struct TCP_Server_Info *server = io_parms->server; 4231 struct cifs_tcon *tcon = io_parms->tcon; 4232 4233 /* we can only offload if we're connected */ 4234 if (!server || !tcon) 4235 return false; 4236 4237 /* we can only offload on an rdma connection */ 4238 if (!server->rdma || !server->smbd_conn) 4239 return false; 4240 4241 /* we don't support signed offload yet */ 4242 if (server->sign) 4243 return false; 4244 4245 /* we don't support encrypted offload yet */ 4246 if (smb3_encryption_required(tcon)) 4247 return false; 4248 4249 /* offload also has its overhead, so only do it if desired */ 4250 if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold) 4251 return false; 4252 4253 return true; 4254 } 4255 #endif /* CONFIG_CIFS_SMB_DIRECT */ 4256 4257 /* 4258 * To form a chain of read requests, any read requests after the first should 4259 * have the end_of_chain boolean set to true. 4260 */ 4261 static int 4262 smb2_new_read_req(void **buf, unsigned int *total_len, 4263 struct cifs_io_parms *io_parms, struct cifs_readdata *rdata, 4264 unsigned int remaining_bytes, int request_type) 4265 { 4266 int rc = -EACCES; 4267 struct smb2_read_req *req = NULL; 4268 struct smb2_hdr *shdr; 4269 struct TCP_Server_Info *server = io_parms->server; 4270 4271 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server, 4272 (void **) &req, total_len); 4273 if (rc) 4274 return rc; 4275 4276 if (server == NULL) 4277 return -ECONNABORTED; 4278 4279 shdr = &req->hdr; 4280 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 4281 4282 req->PersistentFileId = io_parms->persistent_fid; 4283 req->VolatileFileId = io_parms->volatile_fid; 4284 req->ReadChannelInfoOffset = 0; /* reserved */ 4285 req->ReadChannelInfoLength = 0; /* reserved */ 4286 req->Channel = 0; /* reserved */ 4287 req->MinimumCount = 0; 4288 req->Length = cpu_to_le32(io_parms->length); 4289 req->Offset = cpu_to_le64(io_parms->offset); 4290 4291 trace_smb3_read_enter(0 /* xid */, 4292 io_parms->persistent_fid, 4293 io_parms->tcon->tid, io_parms->tcon->ses->Suid, 4294 io_parms->offset, io_parms->length); 4295 #ifdef CONFIG_CIFS_SMB_DIRECT 4296 /* 4297 * If we want to do a RDMA write, fill in and append 4298 * smbd_buffer_descriptor_v1 to the end of read request 4299 */ 4300 if (smb3_use_rdma_offload(io_parms)) { 4301 struct smbd_buffer_descriptor_v1 *v1; 4302 bool need_invalidate = server->dialect == SMB30_PROT_ID; 4303 4304 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->iter, 4305 true, need_invalidate); 4306 if (!rdata->mr) 4307 return -EAGAIN; 4308 4309 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE; 4310 if (need_invalidate) 4311 req->Channel = SMB2_CHANNEL_RDMA_V1; 4312 req->ReadChannelInfoOffset = 4313 cpu_to_le16(offsetof(struct smb2_read_req, Buffer)); 4314 req->ReadChannelInfoLength = 4315 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1)); 4316 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0]; 4317 v1->offset = cpu_to_le64(rdata->mr->mr->iova); 4318 v1->token = cpu_to_le32(rdata->mr->mr->rkey); 4319 v1->length = cpu_to_le32(rdata->mr->mr->length); 4320 4321 *total_len += sizeof(*v1) - 1; 4322 } 4323 #endif 4324 if (request_type & CHAINED_REQUEST) { 4325 if (!(request_type & END_OF_CHAIN)) { 4326 /* next 8-byte aligned request */ 4327 *total_len = ALIGN(*total_len, 8); 4328 shdr->NextCommand = cpu_to_le32(*total_len); 4329 } else /* END_OF_CHAIN */ 4330 shdr->NextCommand = 0; 4331 if (request_type & RELATED_REQUEST) { 4332 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS; 4333 /* 4334 * Related requests use info from previous read request 4335 * in chain. 4336 */ 4337 shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF); 4338 shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF); 4339 req->PersistentFileId = (u64)-1; 4340 req->VolatileFileId = (u64)-1; 4341 } 4342 } 4343 if (remaining_bytes > io_parms->length) 4344 req->RemainingBytes = cpu_to_le32(remaining_bytes); 4345 else 4346 req->RemainingBytes = 0; 4347 4348 *buf = req; 4349 return rc; 4350 } 4351 4352 static void 4353 smb2_readv_callback(struct mid_q_entry *mid) 4354 { 4355 struct cifs_readdata *rdata = mid->callback_data; 4356 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); 4357 struct TCP_Server_Info *server = rdata->server; 4358 struct smb2_hdr *shdr = 4359 (struct smb2_hdr *)rdata->iov[0].iov_base; 4360 struct cifs_credits credits = { .value = 0, .instance = 0 }; 4361 struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 }; 4362 4363 if (rdata->got_bytes) { 4364 rqst.rq_iter = rdata->iter; 4365 rqst.rq_iter_size = iov_iter_count(&rdata->iter); 4366 } 4367 4368 WARN_ONCE(rdata->server != mid->server, 4369 "rdata server %p != mid server %p", 4370 rdata->server, mid->server); 4371 4372 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n", 4373 __func__, mid->mid, mid->mid_state, rdata->result, 4374 rdata->bytes); 4375 4376 switch (mid->mid_state) { 4377 case MID_RESPONSE_RECEIVED: 4378 credits.value = le16_to_cpu(shdr->CreditRequest); 4379 credits.instance = server->reconnect_instance; 4380 /* result already set, check signature */ 4381 if (server->sign && !mid->decrypted) { 4382 int rc; 4383 4384 iov_iter_revert(&rqst.rq_iter, rdata->got_bytes); 4385 iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes); 4386 rc = smb2_verify_signature(&rqst, server); 4387 if (rc) 4388 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n", 4389 rc); 4390 } 4391 /* FIXME: should this be counted toward the initiating task? */ 4392 task_io_account_read(rdata->got_bytes); 4393 cifs_stats_bytes_read(tcon, rdata->got_bytes); 4394 break; 4395 case MID_REQUEST_SUBMITTED: 4396 case MID_RETRY_NEEDED: 4397 rdata->result = -EAGAIN; 4398 if (server->sign && rdata->got_bytes) 4399 /* reset bytes number since we can not check a sign */ 4400 rdata->got_bytes = 0; 4401 /* FIXME: should this be counted toward the initiating task? */ 4402 task_io_account_read(rdata->got_bytes); 4403 cifs_stats_bytes_read(tcon, rdata->got_bytes); 4404 break; 4405 case MID_RESPONSE_MALFORMED: 4406 credits.value = le16_to_cpu(shdr->CreditRequest); 4407 credits.instance = server->reconnect_instance; 4408 fallthrough; 4409 default: 4410 rdata->result = -EIO; 4411 } 4412 #ifdef CONFIG_CIFS_SMB_DIRECT 4413 /* 4414 * If this rdata has a memmory registered, the MR can be freed 4415 * MR needs to be freed as soon as I/O finishes to prevent deadlock 4416 * because they have limited number and are used for future I/Os 4417 */ 4418 if (rdata->mr) { 4419 smbd_deregister_mr(rdata->mr); 4420 rdata->mr = NULL; 4421 } 4422 #endif 4423 if (rdata->result && rdata->result != -ENODATA) { 4424 cifs_stats_fail_inc(tcon, SMB2_READ_HE); 4425 trace_smb3_read_err(0 /* xid */, 4426 rdata->cfile->fid.persistent_fid, 4427 tcon->tid, tcon->ses->Suid, rdata->offset, 4428 rdata->bytes, rdata->result); 4429 } else 4430 trace_smb3_read_done(0 /* xid */, 4431 rdata->cfile->fid.persistent_fid, 4432 tcon->tid, tcon->ses->Suid, 4433 rdata->offset, rdata->got_bytes); 4434 4435 queue_work(cifsiod_wq, &rdata->work); 4436 release_mid(mid); 4437 add_credits(server, &credits, 0); 4438 } 4439 4440 /* smb2_async_readv - send an async read, and set up mid to handle result */ 4441 int 4442 smb2_async_readv(struct cifs_readdata *rdata) 4443 { 4444 int rc, flags = 0; 4445 char *buf; 4446 struct smb2_hdr *shdr; 4447 struct cifs_io_parms io_parms; 4448 struct smb_rqst rqst = { .rq_iov = rdata->iov, 4449 .rq_nvec = 1 }; 4450 struct TCP_Server_Info *server; 4451 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); 4452 unsigned int total_len; 4453 int credit_request; 4454 4455 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n", 4456 __func__, rdata->offset, rdata->bytes); 4457 4458 if (!rdata->server) 4459 rdata->server = cifs_pick_channel(tcon->ses); 4460 4461 io_parms.tcon = tlink_tcon(rdata->cfile->tlink); 4462 io_parms.server = server = rdata->server; 4463 io_parms.offset = rdata->offset; 4464 io_parms.length = rdata->bytes; 4465 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid; 4466 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid; 4467 io_parms.pid = rdata->pid; 4468 4469 rc = smb2_new_read_req( 4470 (void **) &buf, &total_len, &io_parms, rdata, 0, 0); 4471 if (rc) 4472 return rc; 4473 4474 if (smb3_encryption_required(io_parms.tcon)) 4475 flags |= CIFS_TRANSFORM_REQ; 4476 4477 rdata->iov[0].iov_base = buf; 4478 rdata->iov[0].iov_len = total_len; 4479 4480 shdr = (struct smb2_hdr *)buf; 4481 4482 if (rdata->credits.value > 0) { 4483 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes, 4484 SMB2_MAX_BUFFER_SIZE)); 4485 credit_request = le16_to_cpu(shdr->CreditCharge) + 8; 4486 if (server->credits >= server->max_credits) 4487 shdr->CreditRequest = cpu_to_le16(0); 4488 else 4489 shdr->CreditRequest = cpu_to_le16( 4490 min_t(int, server->max_credits - 4491 server->credits, credit_request)); 4492 4493 rc = adjust_credits(server, &rdata->credits, rdata->bytes); 4494 if (rc) 4495 goto async_readv_out; 4496 4497 flags |= CIFS_HAS_CREDITS; 4498 } 4499 4500 kref_get(&rdata->refcount); 4501 rc = cifs_call_async(server, &rqst, 4502 cifs_readv_receive, smb2_readv_callback, 4503 smb3_handle_read_data, rdata, flags, 4504 &rdata->credits); 4505 if (rc) { 4506 kref_put(&rdata->refcount, cifs_readdata_release); 4507 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE); 4508 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid, 4509 io_parms.tcon->tid, 4510 io_parms.tcon->ses->Suid, 4511 io_parms.offset, io_parms.length, rc); 4512 } 4513 4514 async_readv_out: 4515 cifs_small_buf_release(buf); 4516 return rc; 4517 } 4518 4519 int 4520 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms, 4521 unsigned int *nbytes, char **buf, int *buf_type) 4522 { 4523 struct smb_rqst rqst; 4524 int resp_buftype, rc; 4525 struct smb2_read_req *req = NULL; 4526 struct smb2_read_rsp *rsp = NULL; 4527 struct kvec iov[1]; 4528 struct kvec rsp_iov; 4529 unsigned int total_len; 4530 int flags = CIFS_LOG_ERROR; 4531 struct cifs_ses *ses = io_parms->tcon->ses; 4532 4533 if (!io_parms->server) 4534 io_parms->server = cifs_pick_channel(io_parms->tcon->ses); 4535 4536 *nbytes = 0; 4537 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0); 4538 if (rc) 4539 return rc; 4540 4541 if (smb3_encryption_required(io_parms->tcon)) 4542 flags |= CIFS_TRANSFORM_REQ; 4543 4544 iov[0].iov_base = (char *)req; 4545 iov[0].iov_len = total_len; 4546 4547 memset(&rqst, 0, sizeof(struct smb_rqst)); 4548 rqst.rq_iov = iov; 4549 rqst.rq_nvec = 1; 4550 4551 rc = cifs_send_recv(xid, ses, io_parms->server, 4552 &rqst, &resp_buftype, flags, &rsp_iov); 4553 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base; 4554 4555 if (rc) { 4556 if (rc != -ENODATA) { 4557 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE); 4558 cifs_dbg(VFS, "Send error in read = %d\n", rc); 4559 trace_smb3_read_err(xid, 4560 req->PersistentFileId, 4561 io_parms->tcon->tid, ses->Suid, 4562 io_parms->offset, io_parms->length, 4563 rc); 4564 } else 4565 trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid, 4566 ses->Suid, io_parms->offset, 0); 4567 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4568 cifs_small_buf_release(req); 4569 return rc == -ENODATA ? 0 : rc; 4570 } else 4571 trace_smb3_read_done(xid, 4572 req->PersistentFileId, 4573 io_parms->tcon->tid, ses->Suid, 4574 io_parms->offset, io_parms->length); 4575 4576 cifs_small_buf_release(req); 4577 4578 *nbytes = le32_to_cpu(rsp->DataLength); 4579 if ((*nbytes > CIFS_MAX_MSGSIZE) || 4580 (*nbytes > io_parms->length)) { 4581 cifs_dbg(FYI, "bad length %d for count %d\n", 4582 *nbytes, io_parms->length); 4583 rc = -EIO; 4584 *nbytes = 0; 4585 } 4586 4587 if (*buf) { 4588 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes); 4589 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4590 } else if (resp_buftype != CIFS_NO_BUFFER) { 4591 *buf = rsp_iov.iov_base; 4592 if (resp_buftype == CIFS_SMALL_BUFFER) 4593 *buf_type = CIFS_SMALL_BUFFER; 4594 else if (resp_buftype == CIFS_LARGE_BUFFER) 4595 *buf_type = CIFS_LARGE_BUFFER; 4596 } 4597 return rc; 4598 } 4599 4600 /* 4601 * Check the mid_state and signature on received buffer (if any), and queue the 4602 * workqueue completion task. 4603 */ 4604 static void 4605 smb2_writev_callback(struct mid_q_entry *mid) 4606 { 4607 struct cifs_writedata *wdata = mid->callback_data; 4608 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); 4609 struct TCP_Server_Info *server = wdata->server; 4610 unsigned int written; 4611 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; 4612 struct cifs_credits credits = { .value = 0, .instance = 0 }; 4613 4614 WARN_ONCE(wdata->server != mid->server, 4615 "wdata server %p != mid server %p", 4616 wdata->server, mid->server); 4617 4618 switch (mid->mid_state) { 4619 case MID_RESPONSE_RECEIVED: 4620 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 4621 credits.instance = server->reconnect_instance; 4622 wdata->result = smb2_check_receive(mid, server, 0); 4623 if (wdata->result != 0) 4624 break; 4625 4626 written = le32_to_cpu(rsp->DataLength); 4627 /* 4628 * Mask off high 16 bits when bytes written as returned 4629 * by the server is greater than bytes requested by the 4630 * client. OS/2 servers are known to set incorrect 4631 * CountHigh values. 4632 */ 4633 if (written > wdata->bytes) 4634 written &= 0xFFFF; 4635 4636 if (written < wdata->bytes) 4637 wdata->result = -ENOSPC; 4638 else 4639 wdata->bytes = written; 4640 break; 4641 case MID_REQUEST_SUBMITTED: 4642 case MID_RETRY_NEEDED: 4643 wdata->result = -EAGAIN; 4644 break; 4645 case MID_RESPONSE_MALFORMED: 4646 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 4647 credits.instance = server->reconnect_instance; 4648 fallthrough; 4649 default: 4650 wdata->result = -EIO; 4651 break; 4652 } 4653 #ifdef CONFIG_CIFS_SMB_DIRECT 4654 /* 4655 * If this wdata has a memory registered, the MR can be freed 4656 * The number of MRs available is limited, it's important to recover 4657 * used MR as soon as I/O is finished. Hold MR longer in the later 4658 * I/O process can possibly result in I/O deadlock due to lack of MR 4659 * to send request on I/O retry 4660 */ 4661 if (wdata->mr) { 4662 smbd_deregister_mr(wdata->mr); 4663 wdata->mr = NULL; 4664 } 4665 #endif 4666 if (wdata->result) { 4667 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); 4668 trace_smb3_write_err(0 /* no xid */, 4669 wdata->cfile->fid.persistent_fid, 4670 tcon->tid, tcon->ses->Suid, wdata->offset, 4671 wdata->bytes, wdata->result); 4672 if (wdata->result == -ENOSPC) 4673 pr_warn_once("Out of space writing to %s\n", 4674 tcon->tree_name); 4675 } else 4676 trace_smb3_write_done(0 /* no xid */, 4677 wdata->cfile->fid.persistent_fid, 4678 tcon->tid, tcon->ses->Suid, 4679 wdata->offset, wdata->bytes); 4680 4681 queue_work(cifsiod_wq, &wdata->work); 4682 release_mid(mid); 4683 add_credits(server, &credits, 0); 4684 } 4685 4686 /* smb2_async_writev - send an async write, and set up mid to handle result */ 4687 int 4688 smb2_async_writev(struct cifs_writedata *wdata, 4689 void (*release)(struct kref *kref)) 4690 { 4691 int rc = -EACCES, flags = 0; 4692 struct smb2_write_req *req = NULL; 4693 struct smb2_hdr *shdr; 4694 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); 4695 struct TCP_Server_Info *server = wdata->server; 4696 struct kvec iov[1]; 4697 struct smb_rqst rqst = { }; 4698 unsigned int total_len; 4699 struct cifs_io_parms _io_parms; 4700 struct cifs_io_parms *io_parms = NULL; 4701 int credit_request; 4702 4703 if (!wdata->server) 4704 server = wdata->server = cifs_pick_channel(tcon->ses); 4705 4706 /* 4707 * in future we may get cifs_io_parms passed in from the caller, 4708 * but for now we construct it here... 4709 */ 4710 _io_parms = (struct cifs_io_parms) { 4711 .tcon = tcon, 4712 .server = server, 4713 .offset = wdata->offset, 4714 .length = wdata->bytes, 4715 .persistent_fid = wdata->cfile->fid.persistent_fid, 4716 .volatile_fid = wdata->cfile->fid.volatile_fid, 4717 .pid = wdata->pid, 4718 }; 4719 io_parms = &_io_parms; 4720 4721 rc = smb2_plain_req_init(SMB2_WRITE, tcon, server, 4722 (void **) &req, &total_len); 4723 if (rc) 4724 return rc; 4725 4726 if (smb3_encryption_required(tcon)) 4727 flags |= CIFS_TRANSFORM_REQ; 4728 4729 shdr = (struct smb2_hdr *)req; 4730 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 4731 4732 req->PersistentFileId = io_parms->persistent_fid; 4733 req->VolatileFileId = io_parms->volatile_fid; 4734 req->WriteChannelInfoOffset = 0; 4735 req->WriteChannelInfoLength = 0; 4736 req->Channel = SMB2_CHANNEL_NONE; 4737 req->Offset = cpu_to_le64(io_parms->offset); 4738 req->DataOffset = cpu_to_le16( 4739 offsetof(struct smb2_write_req, Buffer)); 4740 req->RemainingBytes = 0; 4741 4742 trace_smb3_write_enter(0 /* xid */, 4743 io_parms->persistent_fid, 4744 io_parms->tcon->tid, 4745 io_parms->tcon->ses->Suid, 4746 io_parms->offset, 4747 io_parms->length); 4748 4749 #ifdef CONFIG_CIFS_SMB_DIRECT 4750 /* 4751 * If we want to do a server RDMA read, fill in and append 4752 * smbd_buffer_descriptor_v1 to the end of write request 4753 */ 4754 if (smb3_use_rdma_offload(io_parms)) { 4755 struct smbd_buffer_descriptor_v1 *v1; 4756 size_t data_size = iov_iter_count(&wdata->iter); 4757 bool need_invalidate = server->dialect == SMB30_PROT_ID; 4758 4759 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->iter, 4760 false, need_invalidate); 4761 if (!wdata->mr) { 4762 rc = -EAGAIN; 4763 goto async_writev_out; 4764 } 4765 req->Length = 0; 4766 req->DataOffset = 0; 4767 req->RemainingBytes = cpu_to_le32(data_size); 4768 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE; 4769 if (need_invalidate) 4770 req->Channel = SMB2_CHANNEL_RDMA_V1; 4771 req->WriteChannelInfoOffset = 4772 cpu_to_le16(offsetof(struct smb2_write_req, Buffer)); 4773 req->WriteChannelInfoLength = 4774 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1)); 4775 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0]; 4776 v1->offset = cpu_to_le64(wdata->mr->mr->iova); 4777 v1->token = cpu_to_le32(wdata->mr->mr->rkey); 4778 v1->length = cpu_to_le32(wdata->mr->mr->length); 4779 } 4780 #endif 4781 iov[0].iov_len = total_len - 1; 4782 iov[0].iov_base = (char *)req; 4783 4784 rqst.rq_iov = iov; 4785 rqst.rq_nvec = 1; 4786 rqst.rq_iter = wdata->iter; 4787 rqst.rq_iter_size = iov_iter_count(&rqst.rq_iter); 4788 #ifdef CONFIG_CIFS_SMB_DIRECT 4789 if (wdata->mr) 4790 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1); 4791 #endif 4792 cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n", 4793 io_parms->offset, io_parms->length, iov_iter_count(&rqst.rq_iter)); 4794 4795 #ifdef CONFIG_CIFS_SMB_DIRECT 4796 /* For RDMA read, I/O size is in RemainingBytes not in Length */ 4797 if (!wdata->mr) 4798 req->Length = cpu_to_le32(io_parms->length); 4799 #else 4800 req->Length = cpu_to_le32(io_parms->length); 4801 #endif 4802 4803 if (wdata->credits.value > 0) { 4804 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes, 4805 SMB2_MAX_BUFFER_SIZE)); 4806 credit_request = le16_to_cpu(shdr->CreditCharge) + 8; 4807 if (server->credits >= server->max_credits) 4808 shdr->CreditRequest = cpu_to_le16(0); 4809 else 4810 shdr->CreditRequest = cpu_to_le16( 4811 min_t(int, server->max_credits - 4812 server->credits, credit_request)); 4813 4814 rc = adjust_credits(server, &wdata->credits, io_parms->length); 4815 if (rc) 4816 goto async_writev_out; 4817 4818 flags |= CIFS_HAS_CREDITS; 4819 } 4820 4821 kref_get(&wdata->refcount); 4822 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL, 4823 wdata, flags, &wdata->credits); 4824 4825 if (rc) { 4826 trace_smb3_write_err(0 /* no xid */, 4827 io_parms->persistent_fid, 4828 io_parms->tcon->tid, 4829 io_parms->tcon->ses->Suid, 4830 io_parms->offset, 4831 io_parms->length, 4832 rc); 4833 kref_put(&wdata->refcount, release); 4834 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); 4835 } 4836 4837 async_writev_out: 4838 cifs_small_buf_release(req); 4839 return rc; 4840 } 4841 4842 /* 4843 * SMB2_write function gets iov pointer to kvec array with n_vec as a length. 4844 * The length field from io_parms must be at least 1 and indicates a number of 4845 * elements with data to write that begins with position 1 in iov array. All 4846 * data length is specified by count. 4847 */ 4848 int 4849 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms, 4850 unsigned int *nbytes, struct kvec *iov, int n_vec) 4851 { 4852 struct smb_rqst rqst; 4853 int rc = 0; 4854 struct smb2_write_req *req = NULL; 4855 struct smb2_write_rsp *rsp = NULL; 4856 int resp_buftype; 4857 struct kvec rsp_iov; 4858 int flags = 0; 4859 unsigned int total_len; 4860 struct TCP_Server_Info *server; 4861 4862 *nbytes = 0; 4863 4864 if (n_vec < 1) 4865 return rc; 4866 4867 if (!io_parms->server) 4868 io_parms->server = cifs_pick_channel(io_parms->tcon->ses); 4869 server = io_parms->server; 4870 if (server == NULL) 4871 return -ECONNABORTED; 4872 4873 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server, 4874 (void **) &req, &total_len); 4875 if (rc) 4876 return rc; 4877 4878 if (smb3_encryption_required(io_parms->tcon)) 4879 flags |= CIFS_TRANSFORM_REQ; 4880 4881 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 4882 4883 req->PersistentFileId = io_parms->persistent_fid; 4884 req->VolatileFileId = io_parms->volatile_fid; 4885 req->WriteChannelInfoOffset = 0; 4886 req->WriteChannelInfoLength = 0; 4887 req->Channel = 0; 4888 req->Length = cpu_to_le32(io_parms->length); 4889 req->Offset = cpu_to_le64(io_parms->offset); 4890 req->DataOffset = cpu_to_le16( 4891 offsetof(struct smb2_write_req, Buffer)); 4892 req->RemainingBytes = 0; 4893 4894 trace_smb3_write_enter(xid, io_parms->persistent_fid, 4895 io_parms->tcon->tid, io_parms->tcon->ses->Suid, 4896 io_parms->offset, io_parms->length); 4897 4898 iov[0].iov_base = (char *)req; 4899 /* 1 for Buffer */ 4900 iov[0].iov_len = total_len - 1; 4901 4902 memset(&rqst, 0, sizeof(struct smb_rqst)); 4903 rqst.rq_iov = iov; 4904 rqst.rq_nvec = n_vec + 1; 4905 4906 rc = cifs_send_recv(xid, io_parms->tcon->ses, server, 4907 &rqst, 4908 &resp_buftype, flags, &rsp_iov); 4909 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base; 4910 4911 if (rc) { 4912 trace_smb3_write_err(xid, 4913 req->PersistentFileId, 4914 io_parms->tcon->tid, 4915 io_parms->tcon->ses->Suid, 4916 io_parms->offset, io_parms->length, rc); 4917 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE); 4918 cifs_dbg(VFS, "Send error in write = %d\n", rc); 4919 } else { 4920 *nbytes = le32_to_cpu(rsp->DataLength); 4921 trace_smb3_write_done(xid, 4922 req->PersistentFileId, 4923 io_parms->tcon->tid, 4924 io_parms->tcon->ses->Suid, 4925 io_parms->offset, *nbytes); 4926 } 4927 4928 cifs_small_buf_release(req); 4929 free_rsp_buf(resp_buftype, rsp); 4930 return rc; 4931 } 4932 4933 int posix_info_sid_size(const void *beg, const void *end) 4934 { 4935 size_t subauth; 4936 int total; 4937 4938 if (beg + 1 > end) 4939 return -1; 4940 4941 subauth = *(u8 *)(beg+1); 4942 if (subauth < 1 || subauth > 15) 4943 return -1; 4944 4945 total = 1 + 1 + 6 + 4*subauth; 4946 if (beg + total > end) 4947 return -1; 4948 4949 return total; 4950 } 4951 4952 int posix_info_parse(const void *beg, const void *end, 4953 struct smb2_posix_info_parsed *out) 4954 4955 { 4956 int total_len = 0; 4957 int owner_len, group_len; 4958 int name_len; 4959 const void *owner_sid; 4960 const void *group_sid; 4961 const void *name; 4962 4963 /* if no end bound given, assume payload to be correct */ 4964 if (!end) { 4965 const struct smb2_posix_info *p = beg; 4966 4967 end = beg + le32_to_cpu(p->NextEntryOffset); 4968 /* last element will have a 0 offset, pick a sensible bound */ 4969 if (end == beg) 4970 end += 0xFFFF; 4971 } 4972 4973 /* check base buf */ 4974 if (beg + sizeof(struct smb2_posix_info) > end) 4975 return -1; 4976 total_len = sizeof(struct smb2_posix_info); 4977 4978 /* check owner sid */ 4979 owner_sid = beg + total_len; 4980 owner_len = posix_info_sid_size(owner_sid, end); 4981 if (owner_len < 0) 4982 return -1; 4983 total_len += owner_len; 4984 4985 /* check group sid */ 4986 group_sid = beg + total_len; 4987 group_len = posix_info_sid_size(group_sid, end); 4988 if (group_len < 0) 4989 return -1; 4990 total_len += group_len; 4991 4992 /* check name len */ 4993 if (beg + total_len + 4 > end) 4994 return -1; 4995 name_len = le32_to_cpu(*(__le32 *)(beg + total_len)); 4996 if (name_len < 1 || name_len > 0xFFFF) 4997 return -1; 4998 total_len += 4; 4999 5000 /* check name */ 5001 name = beg + total_len; 5002 if (name + name_len > end) 5003 return -1; 5004 total_len += name_len; 5005 5006 if (out) { 5007 out->base = beg; 5008 out->size = total_len; 5009 out->name_len = name_len; 5010 out->name = name; 5011 memcpy(&out->owner, owner_sid, owner_len); 5012 memcpy(&out->group, group_sid, group_len); 5013 } 5014 return total_len; 5015 } 5016 5017 static int posix_info_extra_size(const void *beg, const void *end) 5018 { 5019 int len = posix_info_parse(beg, end, NULL); 5020 5021 if (len < 0) 5022 return -1; 5023 return len - sizeof(struct smb2_posix_info); 5024 } 5025 5026 static unsigned int 5027 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry, 5028 size_t size) 5029 { 5030 int len; 5031 unsigned int entrycount = 0; 5032 unsigned int next_offset = 0; 5033 char *entryptr; 5034 FILE_DIRECTORY_INFO *dir_info; 5035 5036 if (bufstart == NULL) 5037 return 0; 5038 5039 entryptr = bufstart; 5040 5041 while (1) { 5042 if (entryptr + next_offset < entryptr || 5043 entryptr + next_offset > end_of_buf || 5044 entryptr + next_offset + size > end_of_buf) { 5045 cifs_dbg(VFS, "malformed search entry would overflow\n"); 5046 break; 5047 } 5048 5049 entryptr = entryptr + next_offset; 5050 dir_info = (FILE_DIRECTORY_INFO *)entryptr; 5051 5052 if (infotype == SMB_FIND_FILE_POSIX_INFO) 5053 len = posix_info_extra_size(entryptr, end_of_buf); 5054 else 5055 len = le32_to_cpu(dir_info->FileNameLength); 5056 5057 if (len < 0 || 5058 entryptr + len < entryptr || 5059 entryptr + len > end_of_buf || 5060 entryptr + len + size > end_of_buf) { 5061 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n", 5062 end_of_buf); 5063 break; 5064 } 5065 5066 *lastentry = entryptr; 5067 entrycount++; 5068 5069 next_offset = le32_to_cpu(dir_info->NextEntryOffset); 5070 if (!next_offset) 5071 break; 5072 } 5073 5074 return entrycount; 5075 } 5076 5077 /* 5078 * Readdir/FindFirst 5079 */ 5080 int SMB2_query_directory_init(const unsigned int xid, 5081 struct cifs_tcon *tcon, 5082 struct TCP_Server_Info *server, 5083 struct smb_rqst *rqst, 5084 u64 persistent_fid, u64 volatile_fid, 5085 int index, int info_level) 5086 { 5087 struct smb2_query_directory_req *req; 5088 unsigned char *bufptr; 5089 __le16 asteriks = cpu_to_le16('*'); 5090 unsigned int output_size = CIFSMaxBufSize - 5091 MAX_SMB2_CREATE_RESPONSE_SIZE - 5092 MAX_SMB2_CLOSE_RESPONSE_SIZE; 5093 unsigned int total_len; 5094 struct kvec *iov = rqst->rq_iov; 5095 int len, rc; 5096 5097 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server, 5098 (void **) &req, &total_len); 5099 if (rc) 5100 return rc; 5101 5102 switch (info_level) { 5103 case SMB_FIND_FILE_DIRECTORY_INFO: 5104 req->FileInformationClass = FILE_DIRECTORY_INFORMATION; 5105 break; 5106 case SMB_FIND_FILE_ID_FULL_DIR_INFO: 5107 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION; 5108 break; 5109 case SMB_FIND_FILE_POSIX_INFO: 5110 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO; 5111 break; 5112 case SMB_FIND_FILE_FULL_DIRECTORY_INFO: 5113 req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION; 5114 break; 5115 default: 5116 cifs_tcon_dbg(VFS, "info level %u isn't supported\n", 5117 info_level); 5118 return -EINVAL; 5119 } 5120 5121 req->FileIndex = cpu_to_le32(index); 5122 req->PersistentFileId = persistent_fid; 5123 req->VolatileFileId = volatile_fid; 5124 5125 len = 0x2; 5126 bufptr = req->Buffer; 5127 memcpy(bufptr, &asteriks, len); 5128 5129 req->FileNameOffset = 5130 cpu_to_le16(sizeof(struct smb2_query_directory_req)); 5131 req->FileNameLength = cpu_to_le16(len); 5132 /* 5133 * BB could be 30 bytes or so longer if we used SMB2 specific 5134 * buffer lengths, but this is safe and close enough. 5135 */ 5136 output_size = min_t(unsigned int, output_size, server->maxBuf); 5137 output_size = min_t(unsigned int, output_size, 2 << 15); 5138 req->OutputBufferLength = cpu_to_le32(output_size); 5139 5140 iov[0].iov_base = (char *)req; 5141 /* 1 for Buffer */ 5142 iov[0].iov_len = total_len - 1; 5143 5144 iov[1].iov_base = (char *)(req->Buffer); 5145 iov[1].iov_len = len; 5146 5147 trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid, 5148 tcon->ses->Suid, index, output_size); 5149 5150 return 0; 5151 } 5152 5153 void SMB2_query_directory_free(struct smb_rqst *rqst) 5154 { 5155 if (rqst && rqst->rq_iov) { 5156 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 5157 } 5158 } 5159 5160 int 5161 smb2_parse_query_directory(struct cifs_tcon *tcon, 5162 struct kvec *rsp_iov, 5163 int resp_buftype, 5164 struct cifs_search_info *srch_inf) 5165 { 5166 struct smb2_query_directory_rsp *rsp; 5167 size_t info_buf_size; 5168 char *end_of_smb; 5169 int rc; 5170 5171 rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base; 5172 5173 switch (srch_inf->info_level) { 5174 case SMB_FIND_FILE_DIRECTORY_INFO: 5175 info_buf_size = sizeof(FILE_DIRECTORY_INFO); 5176 break; 5177 case SMB_FIND_FILE_ID_FULL_DIR_INFO: 5178 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO); 5179 break; 5180 case SMB_FIND_FILE_POSIX_INFO: 5181 /* note that posix payload are variable size */ 5182 info_buf_size = sizeof(struct smb2_posix_info); 5183 break; 5184 case SMB_FIND_FILE_FULL_DIRECTORY_INFO: 5185 info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO); 5186 break; 5187 default: 5188 cifs_tcon_dbg(VFS, "info level %u isn't supported\n", 5189 srch_inf->info_level); 5190 return -EINVAL; 5191 } 5192 5193 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 5194 le32_to_cpu(rsp->OutputBufferLength), rsp_iov, 5195 info_buf_size); 5196 if (rc) { 5197 cifs_tcon_dbg(VFS, "bad info payload"); 5198 return rc; 5199 } 5200 5201 srch_inf->unicode = true; 5202 5203 if (srch_inf->ntwrk_buf_start) { 5204 if (srch_inf->smallBuf) 5205 cifs_small_buf_release(srch_inf->ntwrk_buf_start); 5206 else 5207 cifs_buf_release(srch_inf->ntwrk_buf_start); 5208 } 5209 srch_inf->ntwrk_buf_start = (char *)rsp; 5210 srch_inf->srch_entries_start = srch_inf->last_entry = 5211 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset); 5212 end_of_smb = rsp_iov->iov_len + (char *)rsp; 5213 5214 srch_inf->entries_in_buffer = num_entries( 5215 srch_inf->info_level, 5216 srch_inf->srch_entries_start, 5217 end_of_smb, 5218 &srch_inf->last_entry, 5219 info_buf_size); 5220 5221 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer; 5222 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n", 5223 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry, 5224 srch_inf->srch_entries_start, srch_inf->last_entry); 5225 if (resp_buftype == CIFS_LARGE_BUFFER) 5226 srch_inf->smallBuf = false; 5227 else if (resp_buftype == CIFS_SMALL_BUFFER) 5228 srch_inf->smallBuf = true; 5229 else 5230 cifs_tcon_dbg(VFS, "Invalid search buffer type\n"); 5231 5232 return 0; 5233 } 5234 5235 int 5236 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, 5237 u64 persistent_fid, u64 volatile_fid, int index, 5238 struct cifs_search_info *srch_inf) 5239 { 5240 struct smb_rqst rqst; 5241 struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE]; 5242 struct smb2_query_directory_rsp *rsp = NULL; 5243 int resp_buftype = CIFS_NO_BUFFER; 5244 struct kvec rsp_iov; 5245 int rc = 0; 5246 struct cifs_ses *ses = tcon->ses; 5247 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5248 int flags = 0; 5249 5250 if (!ses || !(ses->server)) 5251 return -EIO; 5252 5253 if (smb3_encryption_required(tcon)) 5254 flags |= CIFS_TRANSFORM_REQ; 5255 5256 memset(&rqst, 0, sizeof(struct smb_rqst)); 5257 memset(&iov, 0, sizeof(iov)); 5258 rqst.rq_iov = iov; 5259 rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE; 5260 5261 rc = SMB2_query_directory_init(xid, tcon, server, 5262 &rqst, persistent_fid, 5263 volatile_fid, index, 5264 srch_inf->info_level); 5265 if (rc) 5266 goto qdir_exit; 5267 5268 rc = cifs_send_recv(xid, ses, server, 5269 &rqst, &resp_buftype, flags, &rsp_iov); 5270 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base; 5271 5272 if (rc) { 5273 if (rc == -ENODATA && 5274 rsp->hdr.Status == STATUS_NO_MORE_FILES) { 5275 trace_smb3_query_dir_done(xid, persistent_fid, 5276 tcon->tid, tcon->ses->Suid, index, 0); 5277 srch_inf->endOfSearch = true; 5278 rc = 0; 5279 } else { 5280 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid, 5281 tcon->ses->Suid, index, 0, rc); 5282 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE); 5283 } 5284 goto qdir_exit; 5285 } 5286 5287 rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype, 5288 srch_inf); 5289 if (rc) { 5290 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid, 5291 tcon->ses->Suid, index, 0, rc); 5292 goto qdir_exit; 5293 } 5294 resp_buftype = CIFS_NO_BUFFER; 5295 5296 trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid, 5297 tcon->ses->Suid, index, srch_inf->entries_in_buffer); 5298 5299 qdir_exit: 5300 SMB2_query_directory_free(&rqst); 5301 free_rsp_buf(resp_buftype, rsp); 5302 return rc; 5303 } 5304 5305 int 5306 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 5307 struct smb_rqst *rqst, 5308 u64 persistent_fid, u64 volatile_fid, u32 pid, 5309 u8 info_class, u8 info_type, u32 additional_info, 5310 void **data, unsigned int *size) 5311 { 5312 struct smb2_set_info_req *req; 5313 struct kvec *iov = rqst->rq_iov; 5314 unsigned int i, total_len; 5315 int rc; 5316 5317 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server, 5318 (void **) &req, &total_len); 5319 if (rc) 5320 return rc; 5321 5322 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid); 5323 req->InfoType = info_type; 5324 req->FileInfoClass = info_class; 5325 req->PersistentFileId = persistent_fid; 5326 req->VolatileFileId = volatile_fid; 5327 req->AdditionalInformation = cpu_to_le32(additional_info); 5328 5329 req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req)); 5330 req->BufferLength = cpu_to_le32(*size); 5331 5332 memcpy(req->Buffer, *data, *size); 5333 total_len += *size; 5334 5335 iov[0].iov_base = (char *)req; 5336 /* 1 for Buffer */ 5337 iov[0].iov_len = total_len - 1; 5338 5339 for (i = 1; i < rqst->rq_nvec; i++) { 5340 le32_add_cpu(&req->BufferLength, size[i]); 5341 iov[i].iov_base = (char *)data[i]; 5342 iov[i].iov_len = size[i]; 5343 } 5344 5345 return 0; 5346 } 5347 5348 void 5349 SMB2_set_info_free(struct smb_rqst *rqst) 5350 { 5351 if (rqst && rqst->rq_iov) 5352 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */ 5353 } 5354 5355 static int 5356 send_set_info(const unsigned int xid, struct cifs_tcon *tcon, 5357 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class, 5358 u8 info_type, u32 additional_info, unsigned int num, 5359 void **data, unsigned int *size) 5360 { 5361 struct smb_rqst rqst; 5362 struct smb2_set_info_rsp *rsp = NULL; 5363 struct kvec *iov; 5364 struct kvec rsp_iov; 5365 int rc = 0; 5366 int resp_buftype; 5367 struct cifs_ses *ses = tcon->ses; 5368 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5369 int flags = 0; 5370 5371 if (!ses || !server) 5372 return -EIO; 5373 5374 if (!num) 5375 return -EINVAL; 5376 5377 if (smb3_encryption_required(tcon)) 5378 flags |= CIFS_TRANSFORM_REQ; 5379 5380 iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL); 5381 if (!iov) 5382 return -ENOMEM; 5383 5384 memset(&rqst, 0, sizeof(struct smb_rqst)); 5385 rqst.rq_iov = iov; 5386 rqst.rq_nvec = num; 5387 5388 rc = SMB2_set_info_init(tcon, server, 5389 &rqst, persistent_fid, volatile_fid, pid, 5390 info_class, info_type, additional_info, 5391 data, size); 5392 if (rc) { 5393 kfree(iov); 5394 return rc; 5395 } 5396 5397 5398 rc = cifs_send_recv(xid, ses, server, 5399 &rqst, &resp_buftype, flags, 5400 &rsp_iov); 5401 SMB2_set_info_free(&rqst); 5402 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base; 5403 5404 if (rc != 0) { 5405 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE); 5406 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid, 5407 ses->Suid, info_class, (__u32)info_type, rc); 5408 } 5409 5410 free_rsp_buf(resp_buftype, rsp); 5411 kfree(iov); 5412 return rc; 5413 } 5414 5415 int 5416 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 5417 u64 volatile_fid, u32 pid, loff_t new_eof) 5418 { 5419 struct smb2_file_eof_info info; 5420 void *data; 5421 unsigned int size; 5422 5423 info.EndOfFile = cpu_to_le64(new_eof); 5424 5425 data = &info; 5426 size = sizeof(struct smb2_file_eof_info); 5427 5428 trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof); 5429 5430 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5431 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE, 5432 0, 1, &data, &size); 5433 } 5434 5435 int 5436 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon, 5437 u64 persistent_fid, u64 volatile_fid, 5438 struct cifs_ntsd *pnntsd, int pacllen, int aclflag) 5439 { 5440 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5441 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag, 5442 1, (void **)&pnntsd, &pacllen); 5443 } 5444 5445 int 5446 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon, 5447 u64 persistent_fid, u64 volatile_fid, 5448 struct smb2_file_full_ea_info *buf, int len) 5449 { 5450 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5451 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 5452 0, 1, (void **)&buf, &len); 5453 } 5454 5455 int 5456 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon, 5457 const u64 persistent_fid, const u64 volatile_fid, 5458 __u8 oplock_level) 5459 { 5460 struct smb_rqst rqst; 5461 int rc; 5462 struct smb2_oplock_break *req = NULL; 5463 struct cifs_ses *ses = tcon->ses; 5464 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5465 int flags = CIFS_OBREAK_OP; 5466 unsigned int total_len; 5467 struct kvec iov[1]; 5468 struct kvec rsp_iov; 5469 int resp_buf_type; 5470 5471 cifs_dbg(FYI, "SMB2_oplock_break\n"); 5472 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server, 5473 (void **) &req, &total_len); 5474 if (rc) 5475 return rc; 5476 5477 if (smb3_encryption_required(tcon)) 5478 flags |= CIFS_TRANSFORM_REQ; 5479 5480 req->VolatileFid = volatile_fid; 5481 req->PersistentFid = persistent_fid; 5482 req->OplockLevel = oplock_level; 5483 req->hdr.CreditRequest = cpu_to_le16(1); 5484 5485 flags |= CIFS_NO_RSP_BUF; 5486 5487 iov[0].iov_base = (char *)req; 5488 iov[0].iov_len = total_len; 5489 5490 memset(&rqst, 0, sizeof(struct smb_rqst)); 5491 rqst.rq_iov = iov; 5492 rqst.rq_nvec = 1; 5493 5494 rc = cifs_send_recv(xid, ses, server, 5495 &rqst, &resp_buf_type, flags, &rsp_iov); 5496 cifs_small_buf_release(req); 5497 5498 if (rc) { 5499 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); 5500 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc); 5501 } 5502 5503 return rc; 5504 } 5505 5506 void 5507 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf, 5508 struct kstatfs *kst) 5509 { 5510 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) * 5511 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit); 5512 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits); 5513 kst->f_bfree = kst->f_bavail = 5514 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits); 5515 return; 5516 } 5517 5518 static void 5519 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data, 5520 struct kstatfs *kst) 5521 { 5522 kst->f_bsize = le32_to_cpu(response_data->BlockSize); 5523 kst->f_blocks = le64_to_cpu(response_data->TotalBlocks); 5524 kst->f_bfree = le64_to_cpu(response_data->BlocksAvail); 5525 if (response_data->UserBlocksAvail == cpu_to_le64(-1)) 5526 kst->f_bavail = kst->f_bfree; 5527 else 5528 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail); 5529 if (response_data->TotalFileNodes != cpu_to_le64(-1)) 5530 kst->f_files = le64_to_cpu(response_data->TotalFileNodes); 5531 if (response_data->FreeFileNodes != cpu_to_le64(-1)) 5532 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes); 5533 5534 return; 5535 } 5536 5537 static int 5538 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, 5539 struct TCP_Server_Info *server, 5540 int level, int outbuf_len, u64 persistent_fid, 5541 u64 volatile_fid) 5542 { 5543 int rc; 5544 struct smb2_query_info_req *req; 5545 unsigned int total_len; 5546 5547 cifs_dbg(FYI, "Query FSInfo level %d\n", level); 5548 5549 if ((tcon->ses == NULL) || server == NULL) 5550 return -EIO; 5551 5552 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server, 5553 (void **) &req, &total_len); 5554 if (rc) 5555 return rc; 5556 5557 req->InfoType = SMB2_O_INFO_FILESYSTEM; 5558 req->FileInfoClass = level; 5559 req->PersistentFileId = persistent_fid; 5560 req->VolatileFileId = volatile_fid; 5561 /* 1 for pad */ 5562 req->InputBufferOffset = 5563 cpu_to_le16(sizeof(struct smb2_query_info_req)); 5564 req->OutputBufferLength = cpu_to_le32( 5565 outbuf_len + sizeof(struct smb2_query_info_rsp)); 5566 5567 iov->iov_base = (char *)req; 5568 iov->iov_len = total_len; 5569 return 0; 5570 } 5571 5572 static inline void free_qfs_info_req(struct kvec *iov) 5573 { 5574 cifs_buf_release(iov->iov_base); 5575 } 5576 5577 int 5578 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon, 5579 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) 5580 { 5581 struct smb_rqst rqst; 5582 struct smb2_query_info_rsp *rsp = NULL; 5583 struct kvec iov; 5584 struct kvec rsp_iov; 5585 int rc = 0; 5586 int resp_buftype; 5587 struct cifs_ses *ses = tcon->ses; 5588 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5589 FILE_SYSTEM_POSIX_INFO *info = NULL; 5590 int flags = 0; 5591 5592 rc = build_qfs_info_req(&iov, tcon, server, 5593 FS_POSIX_INFORMATION, 5594 sizeof(FILE_SYSTEM_POSIX_INFO), 5595 persistent_fid, volatile_fid); 5596 if (rc) 5597 return rc; 5598 5599 if (smb3_encryption_required(tcon)) 5600 flags |= CIFS_TRANSFORM_REQ; 5601 5602 memset(&rqst, 0, sizeof(struct smb_rqst)); 5603 rqst.rq_iov = &iov; 5604 rqst.rq_nvec = 1; 5605 5606 rc = cifs_send_recv(xid, ses, server, 5607 &rqst, &resp_buftype, flags, &rsp_iov); 5608 free_qfs_info_req(&iov); 5609 if (rc) { 5610 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 5611 goto posix_qfsinf_exit; 5612 } 5613 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 5614 5615 info = (FILE_SYSTEM_POSIX_INFO *)( 5616 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp); 5617 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 5618 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, 5619 sizeof(FILE_SYSTEM_POSIX_INFO)); 5620 if (!rc) 5621 copy_posix_fs_info_to_kstatfs(info, fsdata); 5622 5623 posix_qfsinf_exit: 5624 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 5625 return rc; 5626 } 5627 5628 int 5629 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon, 5630 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) 5631 { 5632 struct smb_rqst rqst; 5633 struct smb2_query_info_rsp *rsp = NULL; 5634 struct kvec iov; 5635 struct kvec rsp_iov; 5636 int rc = 0; 5637 int resp_buftype; 5638 struct cifs_ses *ses = tcon->ses; 5639 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5640 struct smb2_fs_full_size_info *info = NULL; 5641 int flags = 0; 5642 5643 rc = build_qfs_info_req(&iov, tcon, server, 5644 FS_FULL_SIZE_INFORMATION, 5645 sizeof(struct smb2_fs_full_size_info), 5646 persistent_fid, volatile_fid); 5647 if (rc) 5648 return rc; 5649 5650 if (smb3_encryption_required(tcon)) 5651 flags |= CIFS_TRANSFORM_REQ; 5652 5653 memset(&rqst, 0, sizeof(struct smb_rqst)); 5654 rqst.rq_iov = &iov; 5655 rqst.rq_nvec = 1; 5656 5657 rc = cifs_send_recv(xid, ses, server, 5658 &rqst, &resp_buftype, flags, &rsp_iov); 5659 free_qfs_info_req(&iov); 5660 if (rc) { 5661 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 5662 goto qfsinf_exit; 5663 } 5664 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 5665 5666 info = (struct smb2_fs_full_size_info *)( 5667 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp); 5668 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 5669 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, 5670 sizeof(struct smb2_fs_full_size_info)); 5671 if (!rc) 5672 smb2_copy_fs_info_to_kstatfs(info, fsdata); 5673 5674 qfsinf_exit: 5675 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 5676 return rc; 5677 } 5678 5679 int 5680 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon, 5681 u64 persistent_fid, u64 volatile_fid, int level) 5682 { 5683 struct smb_rqst rqst; 5684 struct smb2_query_info_rsp *rsp = NULL; 5685 struct kvec iov; 5686 struct kvec rsp_iov; 5687 int rc = 0; 5688 int resp_buftype, max_len, min_len; 5689 struct cifs_ses *ses = tcon->ses; 5690 struct TCP_Server_Info *server = cifs_pick_channel(ses); 5691 unsigned int rsp_len, offset; 5692 int flags = 0; 5693 5694 if (level == FS_DEVICE_INFORMATION) { 5695 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO); 5696 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO); 5697 } else if (level == FS_ATTRIBUTE_INFORMATION) { 5698 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO); 5699 min_len = MIN_FS_ATTR_INFO_SIZE; 5700 } else if (level == FS_SECTOR_SIZE_INFORMATION) { 5701 max_len = sizeof(struct smb3_fs_ss_info); 5702 min_len = sizeof(struct smb3_fs_ss_info); 5703 } else if (level == FS_VOLUME_INFORMATION) { 5704 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN; 5705 min_len = sizeof(struct smb3_fs_vol_info); 5706 } else { 5707 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level); 5708 return -EINVAL; 5709 } 5710 5711 rc = build_qfs_info_req(&iov, tcon, server, 5712 level, max_len, 5713 persistent_fid, volatile_fid); 5714 if (rc) 5715 return rc; 5716 5717 if (smb3_encryption_required(tcon)) 5718 flags |= CIFS_TRANSFORM_REQ; 5719 5720 memset(&rqst, 0, sizeof(struct smb_rqst)); 5721 rqst.rq_iov = &iov; 5722 rqst.rq_nvec = 1; 5723 5724 rc = cifs_send_recv(xid, ses, server, 5725 &rqst, &resp_buftype, flags, &rsp_iov); 5726 free_qfs_info_req(&iov); 5727 if (rc) { 5728 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 5729 goto qfsattr_exit; 5730 } 5731 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 5732 5733 rsp_len = le32_to_cpu(rsp->OutputBufferLength); 5734 offset = le16_to_cpu(rsp->OutputBufferOffset); 5735 rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len); 5736 if (rc) 5737 goto qfsattr_exit; 5738 5739 if (level == FS_ATTRIBUTE_INFORMATION) 5740 memcpy(&tcon->fsAttrInfo, offset 5741 + (char *)rsp, min_t(unsigned int, 5742 rsp_len, max_len)); 5743 else if (level == FS_DEVICE_INFORMATION) 5744 memcpy(&tcon->fsDevInfo, offset 5745 + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO)); 5746 else if (level == FS_SECTOR_SIZE_INFORMATION) { 5747 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *) 5748 (offset + (char *)rsp); 5749 tcon->ss_flags = le32_to_cpu(ss_info->Flags); 5750 tcon->perf_sector_size = 5751 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf); 5752 } else if (level == FS_VOLUME_INFORMATION) { 5753 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *) 5754 (offset + (char *)rsp); 5755 tcon->vol_serial_number = vol_info->VolumeSerialNumber; 5756 tcon->vol_create_time = vol_info->VolumeCreationTime; 5757 } 5758 5759 qfsattr_exit: 5760 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 5761 return rc; 5762 } 5763 5764 int 5765 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon, 5766 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, 5767 const __u32 num_lock, struct smb2_lock_element *buf) 5768 { 5769 struct smb_rqst rqst; 5770 int rc = 0; 5771 struct smb2_lock_req *req = NULL; 5772 struct kvec iov[2]; 5773 struct kvec rsp_iov; 5774 int resp_buf_type; 5775 unsigned int count; 5776 int flags = CIFS_NO_RSP_BUF; 5777 unsigned int total_len; 5778 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses); 5779 5780 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock); 5781 5782 rc = smb2_plain_req_init(SMB2_LOCK, tcon, server, 5783 (void **) &req, &total_len); 5784 if (rc) 5785 return rc; 5786 5787 if (smb3_encryption_required(tcon)) 5788 flags |= CIFS_TRANSFORM_REQ; 5789 5790 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid); 5791 req->LockCount = cpu_to_le16(num_lock); 5792 5793 req->PersistentFileId = persist_fid; 5794 req->VolatileFileId = volatile_fid; 5795 5796 count = num_lock * sizeof(struct smb2_lock_element); 5797 5798 iov[0].iov_base = (char *)req; 5799 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element); 5800 iov[1].iov_base = (char *)buf; 5801 iov[1].iov_len = count; 5802 5803 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks); 5804 5805 memset(&rqst, 0, sizeof(struct smb_rqst)); 5806 rqst.rq_iov = iov; 5807 rqst.rq_nvec = 2; 5808 5809 rc = cifs_send_recv(xid, tcon->ses, server, 5810 &rqst, &resp_buf_type, flags, 5811 &rsp_iov); 5812 cifs_small_buf_release(req); 5813 if (rc) { 5814 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc); 5815 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE); 5816 trace_smb3_lock_err(xid, persist_fid, tcon->tid, 5817 tcon->ses->Suid, rc); 5818 } 5819 5820 return rc; 5821 } 5822 5823 int 5824 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon, 5825 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, 5826 const __u64 length, const __u64 offset, const __u32 lock_flags, 5827 const bool wait) 5828 { 5829 struct smb2_lock_element lock; 5830 5831 lock.Offset = cpu_to_le64(offset); 5832 lock.Length = cpu_to_le64(length); 5833 lock.Flags = cpu_to_le32(lock_flags); 5834 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK) 5835 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY); 5836 5837 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock); 5838 } 5839 5840 int 5841 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon, 5842 __u8 *lease_key, const __le32 lease_state) 5843 { 5844 struct smb_rqst rqst; 5845 int rc; 5846 struct smb2_lease_ack *req = NULL; 5847 struct cifs_ses *ses = tcon->ses; 5848 int flags = CIFS_OBREAK_OP; 5849 unsigned int total_len; 5850 struct kvec iov[1]; 5851 struct kvec rsp_iov; 5852 int resp_buf_type; 5853 __u64 *please_key_high; 5854 __u64 *please_key_low; 5855 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses); 5856 5857 cifs_dbg(FYI, "SMB2_lease_break\n"); 5858 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server, 5859 (void **) &req, &total_len); 5860 if (rc) 5861 return rc; 5862 5863 if (smb3_encryption_required(tcon)) 5864 flags |= CIFS_TRANSFORM_REQ; 5865 5866 req->hdr.CreditRequest = cpu_to_le16(1); 5867 req->StructureSize = cpu_to_le16(36); 5868 total_len += 12; 5869 5870 memcpy(req->LeaseKey, lease_key, 16); 5871 req->LeaseState = lease_state; 5872 5873 flags |= CIFS_NO_RSP_BUF; 5874 5875 iov[0].iov_base = (char *)req; 5876 iov[0].iov_len = total_len; 5877 5878 memset(&rqst, 0, sizeof(struct smb_rqst)); 5879 rqst.rq_iov = iov; 5880 rqst.rq_nvec = 1; 5881 5882 rc = cifs_send_recv(xid, ses, server, 5883 &rqst, &resp_buf_type, flags, &rsp_iov); 5884 cifs_small_buf_release(req); 5885 5886 please_key_low = (__u64 *)lease_key; 5887 please_key_high = (__u64 *)(lease_key+8); 5888 if (rc) { 5889 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); 5890 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid, 5891 ses->Suid, *please_key_low, *please_key_high, rc); 5892 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc); 5893 } else 5894 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid, 5895 ses->Suid, *please_key_low, *please_key_high); 5896 5897 return rc; 5898 } 5899