1 // SPDX-License-Identifier: LGPL-2.1 2 /* 3 * 4 * Copyright (C) International Business Machines Corp., 2009, 2013 5 * Etersoft, 2012 6 * Author(s): Steve French (sfrench@us.ibm.com) 7 * Pavel Shilovsky (pshilovsky@samba.org) 2012 8 * 9 * Contains the routines for constructing the SMB2 PDUs themselves 10 * 11 */ 12 13 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */ 14 /* Note that there are handle based routines which must be */ 15 /* treated slightly differently for reconnection purposes since we never */ 16 /* want to reuse a stale file handle and only the caller knows the file info */ 17 18 #include <linux/fs.h> 19 #include <linux/kernel.h> 20 #include <linux/vfs.h> 21 #include <linux/task_io_accounting_ops.h> 22 #include <linux/uaccess.h> 23 #include <linux/uuid.h> 24 #include <linux/pagemap.h> 25 #include <linux/xattr.h> 26 #include "cifsglob.h" 27 #include "cifsacl.h" 28 #include "cifsproto.h" 29 #include "smb2proto.h" 30 #include "cifs_unicode.h" 31 #include "cifs_debug.h" 32 #include "ntlmssp.h" 33 #include "smb2status.h" 34 #include "smb2glob.h" 35 #include "cifspdu.h" 36 #include "cifs_spnego.h" 37 #include "smbdirect.h" 38 #include "trace.h" 39 #ifdef CONFIG_CIFS_DFS_UPCALL 40 #include "dfs_cache.h" 41 #endif 42 #include "cached_dir.h" 43 44 /* 45 * The following table defines the expected "StructureSize" of SMB2 requests 46 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests. 47 * 48 * Note that commands are defined in smb2pdu.h in le16 but the array below is 49 * indexed by command in host byte order. 50 */ 51 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { 52 /* SMB2_NEGOTIATE */ 36, 53 /* SMB2_SESSION_SETUP */ 25, 54 /* SMB2_LOGOFF */ 4, 55 /* SMB2_TREE_CONNECT */ 9, 56 /* SMB2_TREE_DISCONNECT */ 4, 57 /* SMB2_CREATE */ 57, 58 /* SMB2_CLOSE */ 24, 59 /* SMB2_FLUSH */ 24, 60 /* SMB2_READ */ 49, 61 /* SMB2_WRITE */ 49, 62 /* SMB2_LOCK */ 48, 63 /* SMB2_IOCTL */ 57, 64 /* SMB2_CANCEL */ 4, 65 /* SMB2_ECHO */ 4, 66 /* SMB2_QUERY_DIRECTORY */ 33, 67 /* SMB2_CHANGE_NOTIFY */ 32, 68 /* SMB2_QUERY_INFO */ 41, 69 /* SMB2_SET_INFO */ 33, 70 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */ 71 }; 72 73 int smb3_encryption_required(const struct cifs_tcon *tcon) 74 { 75 if (!tcon || !tcon->ses) 76 return 0; 77 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) || 78 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)) 79 return 1; 80 if (tcon->seal && 81 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 82 return 1; 83 return 0; 84 } 85 86 static void 87 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd, 88 const struct cifs_tcon *tcon, 89 struct TCP_Server_Info *server) 90 { 91 struct smb3_hdr_req *smb3_hdr; 92 93 shdr->ProtocolId = SMB2_PROTO_NUMBER; 94 shdr->StructureSize = cpu_to_le16(64); 95 shdr->Command = smb2_cmd; 96 97 if (server) { 98 /* After reconnect SMB3 must set ChannelSequence on subsequent reqs */ 99 if (server->dialect >= SMB30_PROT_ID) { 100 smb3_hdr = (struct smb3_hdr_req *)shdr; 101 /* 102 * if primary channel is not set yet, use default 103 * channel for chan sequence num 104 */ 105 if (SERVER_IS_CHAN(server)) 106 smb3_hdr->ChannelSequence = 107 cpu_to_le16(server->primary_server->channel_sequence_num); 108 else 109 smb3_hdr->ChannelSequence = 110 cpu_to_le16(server->channel_sequence_num); 111 } 112 spin_lock(&server->req_lock); 113 /* Request up to 10 credits but don't go over the limit. */ 114 if (server->credits >= server->max_credits) 115 shdr->CreditRequest = cpu_to_le16(0); 116 else 117 shdr->CreditRequest = cpu_to_le16( 118 min_t(int, server->max_credits - 119 server->credits, 10)); 120 spin_unlock(&server->req_lock); 121 } else { 122 shdr->CreditRequest = cpu_to_le16(2); 123 } 124 shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid); 125 126 if (!tcon) 127 goto out; 128 129 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */ 130 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */ 131 if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU)) 132 shdr->CreditCharge = cpu_to_le16(1); 133 /* else CreditCharge MBZ */ 134 135 shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid); 136 /* Uid is not converted */ 137 if (tcon->ses) 138 shdr->SessionId = cpu_to_le64(tcon->ses->Suid); 139 140 /* 141 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have 142 * to pass the path on the Open SMB prefixed by \\server\share. 143 * Not sure when we would need to do the augmented path (if ever) and 144 * setting this flag breaks the SMB2 open operation since it is 145 * illegal to send an empty path name (without \\server\share prefix) 146 * when the DFS flag is set in the SMB open header. We could 147 * consider setting the flag on all operations other than open 148 * but it is safer to net set it for now. 149 */ 150 /* if (tcon->share_flags & SHI1005_FLAGS_DFS) 151 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */ 152 153 if (server && server->sign && !smb3_encryption_required(tcon)) 154 shdr->Flags |= SMB2_FLAGS_SIGNED; 155 out: 156 return; 157 } 158 159 /* helper function for code reuse */ 160 static int 161 cifs_chan_skip_or_disable(struct cifs_ses *ses, 162 struct TCP_Server_Info *server, 163 bool from_reconnect) 164 { 165 struct TCP_Server_Info *pserver; 166 unsigned int chan_index; 167 168 if (SERVER_IS_CHAN(server)) { 169 cifs_dbg(VFS, 170 "server %s does not support multichannel anymore. Skip secondary channel\n", 171 ses->server->hostname); 172 173 spin_lock(&ses->chan_lock); 174 chan_index = cifs_ses_get_chan_index(ses, server); 175 if (chan_index == CIFS_INVAL_CHAN_INDEX) { 176 spin_unlock(&ses->chan_lock); 177 goto skip_terminate; 178 } 179 180 ses->chans[chan_index].server = NULL; 181 server->terminate = true; 182 spin_unlock(&ses->chan_lock); 183 184 /* 185 * the above reference of server by channel 186 * needs to be dropped without holding chan_lock 187 * as cifs_put_tcp_session takes a higher lock 188 * i.e. cifs_tcp_ses_lock 189 */ 190 cifs_put_tcp_session(server, from_reconnect); 191 192 cifs_signal_cifsd_for_reconnect(server, false); 193 194 /* mark primary server as needing reconnect */ 195 pserver = server->primary_server; 196 cifs_signal_cifsd_for_reconnect(pserver, false); 197 skip_terminate: 198 return -EHOSTDOWN; 199 } 200 201 cifs_server_dbg(VFS, 202 "server does not support multichannel anymore. Disable all other channels\n"); 203 cifs_disable_secondary_channels(ses); 204 205 206 return 0; 207 } 208 209 static int 210 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon, 211 struct TCP_Server_Info *server, bool from_reconnect) 212 { 213 int rc = 0; 214 struct nls_table *nls_codepage = NULL; 215 struct cifs_ses *ses; 216 int xid; 217 218 /* 219 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so 220 * check for tcp and smb session status done differently 221 * for those three - in the calling routine. 222 */ 223 if (tcon == NULL) 224 return 0; 225 226 /* 227 * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in 228 * cifs_tree_connect(). 229 */ 230 if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL) 231 return 0; 232 233 spin_lock(&tcon->tc_lock); 234 if (tcon->status == TID_EXITING) { 235 /* 236 * only tree disconnect allowed when disconnecting ... 237 */ 238 if (smb2_command != SMB2_TREE_DISCONNECT) { 239 spin_unlock(&tcon->tc_lock); 240 cifs_dbg(FYI, "can not send cmd %d while umounting\n", 241 smb2_command); 242 return -ENODEV; 243 } 244 } 245 spin_unlock(&tcon->tc_lock); 246 247 ses = tcon->ses; 248 if (!ses) 249 return -EIO; 250 spin_lock(&ses->ses_lock); 251 if (ses->ses_status == SES_EXITING) { 252 spin_unlock(&ses->ses_lock); 253 return -EIO; 254 } 255 spin_unlock(&ses->ses_lock); 256 if (!ses->server || !server) 257 return -EIO; 258 259 spin_lock(&server->srv_lock); 260 if (server->tcpStatus == CifsNeedReconnect) { 261 /* 262 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE 263 * here since they are implicitly done when session drops. 264 */ 265 switch (smb2_command) { 266 /* 267 * BB Should we keep oplock break and add flush to exceptions? 268 */ 269 case SMB2_TREE_DISCONNECT: 270 case SMB2_CANCEL: 271 case SMB2_CLOSE: 272 case SMB2_OPLOCK_BREAK: 273 spin_unlock(&server->srv_lock); 274 return -EAGAIN; 275 } 276 } 277 278 /* if server is marked for termination, cifsd will cleanup */ 279 if (server->terminate) { 280 spin_unlock(&server->srv_lock); 281 return -EHOSTDOWN; 282 } 283 spin_unlock(&server->srv_lock); 284 285 again: 286 rc = cifs_wait_for_server_reconnect(server, tcon->retry); 287 if (rc) 288 return rc; 289 290 spin_lock(&ses->chan_lock); 291 if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) { 292 spin_unlock(&ses->chan_lock); 293 return 0; 294 } 295 spin_unlock(&ses->chan_lock); 296 cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d", 297 tcon->ses->chans_need_reconnect, 298 tcon->need_reconnect); 299 300 mutex_lock(&ses->session_mutex); 301 /* 302 * if this is called by delayed work, and the channel has been disabled 303 * in parallel, the delayed work can continue to execute in parallel 304 * there's a chance that this channel may not exist anymore 305 */ 306 spin_lock(&server->srv_lock); 307 if (server->tcpStatus == CifsExiting) { 308 spin_unlock(&server->srv_lock); 309 mutex_unlock(&ses->session_mutex); 310 rc = -EHOSTDOWN; 311 goto out; 312 } 313 314 /* 315 * Recheck after acquire mutex. If another thread is negotiating 316 * and the server never sends an answer the socket will be closed 317 * and tcpStatus set to reconnect. 318 */ 319 if (server->tcpStatus == CifsNeedReconnect) { 320 spin_unlock(&server->srv_lock); 321 mutex_unlock(&ses->session_mutex); 322 323 if (tcon->retry) 324 goto again; 325 326 rc = -EHOSTDOWN; 327 goto out; 328 } 329 spin_unlock(&server->srv_lock); 330 331 nls_codepage = ses->local_nls; 332 333 /* 334 * need to prevent multiple threads trying to simultaneously 335 * reconnect the same SMB session 336 */ 337 spin_lock(&ses->ses_lock); 338 spin_lock(&ses->chan_lock); 339 if (!cifs_chan_needs_reconnect(ses, server) && 340 ses->ses_status == SES_GOOD) { 341 spin_unlock(&ses->chan_lock); 342 spin_unlock(&ses->ses_lock); 343 /* this means that we only need to tree connect */ 344 if (tcon->need_reconnect) 345 goto skip_sess_setup; 346 347 mutex_unlock(&ses->session_mutex); 348 goto out; 349 } 350 spin_unlock(&ses->chan_lock); 351 spin_unlock(&ses->ses_lock); 352 353 rc = cifs_negotiate_protocol(0, ses, server); 354 if (!rc) { 355 /* 356 * if server stopped supporting multichannel 357 * and the first channel reconnected, disable all the others. 358 */ 359 if (ses->chan_count > 1 && 360 !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) { 361 rc = cifs_chan_skip_or_disable(ses, server, 362 from_reconnect); 363 if (rc) { 364 mutex_unlock(&ses->session_mutex); 365 goto out; 366 } 367 } 368 369 rc = cifs_setup_session(0, ses, server, nls_codepage); 370 if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) { 371 /* 372 * Try alternate password for next reconnect (key rotation 373 * could be enabled on the server e.g.) if an alternate 374 * password is available and the current password is expired, 375 * but do not swap on non pwd related errors like host down 376 */ 377 if (ses->password2) 378 swap(ses->password2, ses->password); 379 } 380 381 if ((rc == -EACCES) && !tcon->retry) { 382 mutex_unlock(&ses->session_mutex); 383 rc = -EHOSTDOWN; 384 goto failed; 385 } else if (rc) { 386 mutex_unlock(&ses->session_mutex); 387 goto out; 388 } 389 } else { 390 mutex_unlock(&ses->session_mutex); 391 goto out; 392 } 393 394 skip_sess_setup: 395 if (!tcon->need_reconnect) { 396 mutex_unlock(&ses->session_mutex); 397 goto out; 398 } 399 cifs_mark_open_files_invalid(tcon); 400 if (tcon->use_persistent) 401 tcon->need_reopen_files = true; 402 403 rc = cifs_tree_connect(0, tcon, nls_codepage); 404 405 cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc); 406 if (rc) { 407 /* If sess reconnected but tcon didn't, something strange ... */ 408 mutex_unlock(&ses->session_mutex); 409 cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc); 410 goto out; 411 } 412 413 spin_lock(&ses->ses_lock); 414 if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) { 415 spin_unlock(&ses->ses_lock); 416 mutex_unlock(&ses->session_mutex); 417 goto skip_add_channels; 418 } 419 ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS; 420 spin_unlock(&ses->ses_lock); 421 422 if (!rc && 423 (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) && 424 server->ops->query_server_interfaces) { 425 mutex_unlock(&ses->session_mutex); 426 427 /* 428 * query server network interfaces, in case they change 429 */ 430 xid = get_xid(); 431 rc = server->ops->query_server_interfaces(xid, tcon, false); 432 free_xid(xid); 433 434 if (rc == -EOPNOTSUPP && ses->chan_count > 1) { 435 /* 436 * some servers like Azure SMB server do not advertise 437 * that multichannel has been disabled with server 438 * capabilities, rather return STATUS_NOT_IMPLEMENTED. 439 * treat this as server not supporting multichannel 440 */ 441 442 rc = cifs_chan_skip_or_disable(ses, server, 443 from_reconnect); 444 goto skip_add_channels; 445 } else if (rc) 446 cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n", 447 __func__, rc); 448 449 if (ses->chan_max > ses->chan_count && 450 ses->iface_count && 451 !SERVER_IS_CHAN(server)) { 452 if (ses->chan_count == 1) { 453 cifs_server_dbg(VFS, "supports multichannel now\n"); 454 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces, 455 (SMB_INTERFACE_POLL_INTERVAL * HZ)); 456 } 457 458 cifs_try_adding_channels(ses); 459 } 460 } else { 461 mutex_unlock(&ses->session_mutex); 462 } 463 464 skip_add_channels: 465 spin_lock(&ses->ses_lock); 466 ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS; 467 spin_unlock(&ses->ses_lock); 468 469 if (smb2_command != SMB2_INTERNAL_CMD) 470 mod_delayed_work(cifsiod_wq, &server->reconnect, 0); 471 472 atomic_inc(&tconInfoReconnectCount); 473 out: 474 /* 475 * Check if handle based operation so we know whether we can continue 476 * or not without returning to caller to reset file handle. 477 */ 478 /* 479 * BB Is flush done by server on drop of tcp session? Should we special 480 * case it and skip above? 481 */ 482 switch (smb2_command) { 483 case SMB2_FLUSH: 484 case SMB2_READ: 485 case SMB2_WRITE: 486 case SMB2_LOCK: 487 case SMB2_QUERY_DIRECTORY: 488 case SMB2_CHANGE_NOTIFY: 489 case SMB2_QUERY_INFO: 490 case SMB2_SET_INFO: 491 rc = -EAGAIN; 492 } 493 failed: 494 return rc; 495 } 496 497 static void 498 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, 499 struct TCP_Server_Info *server, 500 void *buf, 501 unsigned int *total_len) 502 { 503 struct smb2_pdu *spdu = buf; 504 /* lookup word count ie StructureSize from table */ 505 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)]; 506 507 /* 508 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of 509 * largest operations (Create) 510 */ 511 memset(buf, 0, 256); 512 513 smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server); 514 spdu->StructureSize2 = cpu_to_le16(parmsize); 515 516 *total_len = parmsize + sizeof(struct smb2_hdr); 517 } 518 519 /* 520 * Allocate and return pointer to an SMB request hdr, and set basic 521 * SMB information in the SMB header. If the return code is zero, this 522 * function must have filled in request_buf pointer. 523 */ 524 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon, 525 struct TCP_Server_Info *server, 526 void **request_buf, unsigned int *total_len) 527 { 528 /* BB eventually switch this to SMB2 specific small buf size */ 529 switch (smb2_command) { 530 case SMB2_SET_INFO: 531 case SMB2_QUERY_INFO: 532 *request_buf = cifs_buf_get(); 533 break; 534 default: 535 *request_buf = cifs_small_buf_get(); 536 break; 537 } 538 if (*request_buf == NULL) { 539 /* BB should we add a retry in here if not a writepage? */ 540 return -ENOMEM; 541 } 542 543 fill_small_buf(smb2_command, tcon, server, 544 (struct smb2_hdr *)(*request_buf), 545 total_len); 546 547 if (tcon != NULL) { 548 uint16_t com_code = le16_to_cpu(smb2_command); 549 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]); 550 cifs_stats_inc(&tcon->num_smbs_sent); 551 } 552 553 return 0; 554 } 555 556 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon, 557 struct TCP_Server_Info *server, 558 void **request_buf, unsigned int *total_len) 559 { 560 int rc; 561 562 rc = smb2_reconnect(smb2_command, tcon, server, false); 563 if (rc) 564 return rc; 565 566 return __smb2_plain_req_init(smb2_command, tcon, server, request_buf, 567 total_len); 568 } 569 570 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon, 571 struct TCP_Server_Info *server, 572 void **request_buf, unsigned int *total_len) 573 { 574 /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */ 575 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) { 576 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server, 577 request_buf, total_len); 578 } 579 return smb2_plain_req_init(SMB2_IOCTL, tcon, server, 580 request_buf, total_len); 581 } 582 583 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */ 584 585 static void 586 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt) 587 { 588 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES; 589 pneg_ctxt->DataLength = cpu_to_le16(38); 590 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1); 591 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE); 592 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE); 593 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512; 594 } 595 596 static void 597 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt) 598 { 599 pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES; 600 pneg_ctxt->DataLength = 601 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context) 602 - sizeof(struct smb2_neg_context)); 603 pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3); 604 pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77; 605 pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF; 606 pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1; 607 } 608 609 static unsigned int 610 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt) 611 { 612 unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities); 613 unsigned short num_algs = 1; /* number of signing algorithms sent */ 614 615 pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES; 616 /* 617 * Context Data length must be rounded to multiple of 8 for some servers 618 */ 619 pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) - 620 sizeof(struct smb2_neg_context) + 621 (num_algs * sizeof(u16)), 8)); 622 pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs); 623 pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC); 624 625 ctxt_len += sizeof(__le16) * num_algs; 626 ctxt_len = ALIGN(ctxt_len, 8); 627 return ctxt_len; 628 /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */ 629 } 630 631 static void 632 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt) 633 { 634 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES; 635 if (require_gcm_256) { 636 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */ 637 pneg_ctxt->CipherCount = cpu_to_le16(1); 638 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM; 639 } else if (enable_gcm_256) { 640 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */ 641 pneg_ctxt->CipherCount = cpu_to_le16(3); 642 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM; 643 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM; 644 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM; 645 } else { 646 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */ 647 pneg_ctxt->CipherCount = cpu_to_le16(2); 648 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM; 649 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM; 650 } 651 } 652 653 static unsigned int 654 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname) 655 { 656 struct nls_table *cp = load_nls_default(); 657 658 pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID; 659 660 /* copy up to max of first 100 bytes of server name to NetName field */ 661 pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp)); 662 /* context size is DataLength + minimal smb2_neg_context */ 663 return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8); 664 } 665 666 static void 667 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt) 668 { 669 pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE; 670 pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN); 671 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ 672 pneg_ctxt->Name[0] = 0x93; 673 pneg_ctxt->Name[1] = 0xAD; 674 pneg_ctxt->Name[2] = 0x25; 675 pneg_ctxt->Name[3] = 0x50; 676 pneg_ctxt->Name[4] = 0x9C; 677 pneg_ctxt->Name[5] = 0xB4; 678 pneg_ctxt->Name[6] = 0x11; 679 pneg_ctxt->Name[7] = 0xE7; 680 pneg_ctxt->Name[8] = 0xB4; 681 pneg_ctxt->Name[9] = 0x23; 682 pneg_ctxt->Name[10] = 0x83; 683 pneg_ctxt->Name[11] = 0xDE; 684 pneg_ctxt->Name[12] = 0x96; 685 pneg_ctxt->Name[13] = 0x8B; 686 pneg_ctxt->Name[14] = 0xCD; 687 pneg_ctxt->Name[15] = 0x7C; 688 } 689 690 static void 691 assemble_neg_contexts(struct smb2_negotiate_req *req, 692 struct TCP_Server_Info *server, unsigned int *total_len) 693 { 694 unsigned int ctxt_len, neg_context_count; 695 struct TCP_Server_Info *pserver; 696 char *pneg_ctxt; 697 char *hostname; 698 699 if (*total_len > 200) { 700 /* In case length corrupted don't want to overrun smb buffer */ 701 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n"); 702 return; 703 } 704 705 /* 706 * round up total_len of fixed part of SMB3 negotiate request to 8 707 * byte boundary before adding negotiate contexts 708 */ 709 *total_len = ALIGN(*total_len, 8); 710 711 pneg_ctxt = (*total_len) + (char *)req; 712 req->NegotiateContextOffset = cpu_to_le32(*total_len); 713 714 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt); 715 ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8); 716 *total_len += ctxt_len; 717 pneg_ctxt += ctxt_len; 718 719 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt); 720 ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8); 721 *total_len += ctxt_len; 722 pneg_ctxt += ctxt_len; 723 724 /* 725 * secondary channels don't have the hostname field populated 726 * use the hostname field in the primary channel instead 727 */ 728 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 729 cifs_server_lock(pserver); 730 hostname = pserver->hostname; 731 if (hostname && (hostname[0] != 0)) { 732 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt, 733 hostname); 734 *total_len += ctxt_len; 735 pneg_ctxt += ctxt_len; 736 neg_context_count = 3; 737 } else 738 neg_context_count = 2; 739 cifs_server_unlock(pserver); 740 741 build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt); 742 *total_len += sizeof(struct smb2_posix_neg_context); 743 pneg_ctxt += sizeof(struct smb2_posix_neg_context); 744 neg_context_count++; 745 746 if (server->compress_algorithm) { 747 build_compression_ctxt((struct smb2_compression_capabilities_context *) 748 pneg_ctxt); 749 ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8); 750 *total_len += ctxt_len; 751 pneg_ctxt += ctxt_len; 752 neg_context_count++; 753 } 754 755 if (enable_negotiate_signing) { 756 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *) 757 pneg_ctxt); 758 *total_len += ctxt_len; 759 pneg_ctxt += ctxt_len; 760 neg_context_count++; 761 } 762 763 /* check for and add transport_capabilities and signing capabilities */ 764 req->NegotiateContextCount = cpu_to_le16(neg_context_count); 765 766 } 767 768 /* If invalid preauth context warn but use what we requested, SHA-512 */ 769 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt) 770 { 771 unsigned int len = le16_to_cpu(ctxt->DataLength); 772 773 /* 774 * Caller checked that DataLength remains within SMB boundary. We still 775 * need to confirm that one HashAlgorithms member is accounted for. 776 */ 777 if (len < MIN_PREAUTH_CTXT_DATA_LEN) { 778 pr_warn_once("server sent bad preauth context\n"); 779 return; 780 } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) { 781 pr_warn_once("server sent invalid SaltLength\n"); 782 return; 783 } 784 if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1) 785 pr_warn_once("Invalid SMB3 hash algorithm count\n"); 786 if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512) 787 pr_warn_once("unknown SMB3 hash algorithm\n"); 788 } 789 790 static void decode_compress_ctx(struct TCP_Server_Info *server, 791 struct smb2_compression_capabilities_context *ctxt) 792 { 793 unsigned int len = le16_to_cpu(ctxt->DataLength); 794 795 /* 796 * Caller checked that DataLength remains within SMB boundary. We still 797 * need to confirm that one CompressionAlgorithms member is accounted 798 * for. 799 */ 800 if (len < 10) { 801 pr_warn_once("server sent bad compression cntxt\n"); 802 return; 803 } 804 if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) { 805 pr_warn_once("Invalid SMB3 compress algorithm count\n"); 806 return; 807 } 808 if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) { 809 pr_warn_once("unknown compression algorithm\n"); 810 return; 811 } 812 server->compress_algorithm = ctxt->CompressionAlgorithms[0]; 813 } 814 815 static int decode_encrypt_ctx(struct TCP_Server_Info *server, 816 struct smb2_encryption_neg_context *ctxt) 817 { 818 unsigned int len = le16_to_cpu(ctxt->DataLength); 819 820 cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len); 821 /* 822 * Caller checked that DataLength remains within SMB boundary. We still 823 * need to confirm that one Cipher flexible array member is accounted 824 * for. 825 */ 826 if (len < MIN_ENCRYPT_CTXT_DATA_LEN) { 827 pr_warn_once("server sent bad crypto ctxt len\n"); 828 return -EINVAL; 829 } 830 831 if (le16_to_cpu(ctxt->CipherCount) != 1) { 832 pr_warn_once("Invalid SMB3.11 cipher count\n"); 833 return -EINVAL; 834 } 835 cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0])); 836 if (require_gcm_256) { 837 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) { 838 cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n"); 839 return -EOPNOTSUPP; 840 } 841 } else if (ctxt->Ciphers[0] == 0) { 842 /* 843 * e.g. if server only supported AES256_CCM (very unlikely) 844 * or server supported no encryption types or had all disabled. 845 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case 846 * in which mount requested encryption ("seal") checks later 847 * on during tree connection will return proper rc, but if 848 * seal not requested by client, since server is allowed to 849 * return 0 to indicate no supported cipher, we can't fail here 850 */ 851 server->cipher_type = 0; 852 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION; 853 pr_warn_once("Server does not support requested encryption types\n"); 854 return 0; 855 } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) && 856 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) && 857 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) { 858 /* server returned a cipher we didn't ask for */ 859 pr_warn_once("Invalid SMB3.11 cipher returned\n"); 860 return -EINVAL; 861 } 862 server->cipher_type = ctxt->Ciphers[0]; 863 server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION; 864 return 0; 865 } 866 867 static void decode_signing_ctx(struct TCP_Server_Info *server, 868 struct smb2_signing_capabilities *pctxt) 869 { 870 unsigned int len = le16_to_cpu(pctxt->DataLength); 871 872 /* 873 * Caller checked that DataLength remains within SMB boundary. We still 874 * need to confirm that one SigningAlgorithms flexible array member is 875 * accounted for. 876 */ 877 if ((len < 4) || (len > 16)) { 878 pr_warn_once("server sent bad signing negcontext\n"); 879 return; 880 } 881 if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) { 882 pr_warn_once("Invalid signing algorithm count\n"); 883 return; 884 } 885 if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) { 886 pr_warn_once("unknown signing algorithm\n"); 887 return; 888 } 889 890 server->signing_negotiated = true; 891 server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]); 892 cifs_dbg(FYI, "signing algorithm %d chosen\n", 893 server->signing_algorithm); 894 } 895 896 897 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp, 898 struct TCP_Server_Info *server, 899 unsigned int len_of_smb) 900 { 901 struct smb2_neg_context *pctx; 902 unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset); 903 unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount); 904 unsigned int len_of_ctxts, i; 905 int rc = 0; 906 907 cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt); 908 if (len_of_smb <= offset) { 909 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n"); 910 return -EINVAL; 911 } 912 913 len_of_ctxts = len_of_smb - offset; 914 915 for (i = 0; i < ctxt_cnt; i++) { 916 int clen; 917 /* check that offset is not beyond end of SMB */ 918 if (len_of_ctxts < sizeof(struct smb2_neg_context)) 919 break; 920 921 pctx = (struct smb2_neg_context *)(offset + (char *)rsp); 922 clen = sizeof(struct smb2_neg_context) 923 + le16_to_cpu(pctx->DataLength); 924 /* 925 * 2.2.4 SMB2 NEGOTIATE Response 926 * Subsequent negotiate contexts MUST appear at the first 8-byte 927 * aligned offset following the previous negotiate context. 928 */ 929 if (i + 1 != ctxt_cnt) 930 clen = ALIGN(clen, 8); 931 if (clen > len_of_ctxts) 932 break; 933 934 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES) 935 decode_preauth_context( 936 (struct smb2_preauth_neg_context *)pctx); 937 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES) 938 rc = decode_encrypt_ctx(server, 939 (struct smb2_encryption_neg_context *)pctx); 940 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES) 941 decode_compress_ctx(server, 942 (struct smb2_compression_capabilities_context *)pctx); 943 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE) 944 server->posix_ext_supported = true; 945 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES) 946 decode_signing_ctx(server, 947 (struct smb2_signing_capabilities *)pctx); 948 else 949 cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n", 950 le16_to_cpu(pctx->ContextType)); 951 if (rc) 952 break; 953 954 offset += clen; 955 len_of_ctxts -= clen; 956 } 957 return rc; 958 } 959 960 static struct create_posix * 961 create_posix_buf(umode_t mode) 962 { 963 struct create_posix *buf; 964 965 buf = kzalloc(sizeof(struct create_posix), 966 GFP_KERNEL); 967 if (!buf) 968 return NULL; 969 970 buf->ccontext.DataOffset = 971 cpu_to_le16(offsetof(struct create_posix, Mode)); 972 buf->ccontext.DataLength = cpu_to_le32(4); 973 buf->ccontext.NameOffset = 974 cpu_to_le16(offsetof(struct create_posix, Name)); 975 buf->ccontext.NameLength = cpu_to_le16(16); 976 977 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ 978 buf->Name[0] = 0x93; 979 buf->Name[1] = 0xAD; 980 buf->Name[2] = 0x25; 981 buf->Name[3] = 0x50; 982 buf->Name[4] = 0x9C; 983 buf->Name[5] = 0xB4; 984 buf->Name[6] = 0x11; 985 buf->Name[7] = 0xE7; 986 buf->Name[8] = 0xB4; 987 buf->Name[9] = 0x23; 988 buf->Name[10] = 0x83; 989 buf->Name[11] = 0xDE; 990 buf->Name[12] = 0x96; 991 buf->Name[13] = 0x8B; 992 buf->Name[14] = 0xCD; 993 buf->Name[15] = 0x7C; 994 buf->Mode = cpu_to_le32(mode); 995 cifs_dbg(FYI, "mode on posix create 0%o\n", mode); 996 return buf; 997 } 998 999 static int 1000 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode) 1001 { 1002 unsigned int num = *num_iovec; 1003 1004 iov[num].iov_base = create_posix_buf(mode); 1005 if (mode == ACL_NO_MODE) 1006 cifs_dbg(FYI, "%s: no mode\n", __func__); 1007 if (iov[num].iov_base == NULL) 1008 return -ENOMEM; 1009 iov[num].iov_len = sizeof(struct create_posix); 1010 *num_iovec = num + 1; 1011 return 0; 1012 } 1013 1014 1015 /* 1016 * 1017 * SMB2 Worker functions follow: 1018 * 1019 * The general structure of the worker functions is: 1020 * 1) Call smb2_init (assembles SMB2 header) 1021 * 2) Initialize SMB2 command specific fields in fixed length area of SMB 1022 * 3) Call smb_sendrcv2 (sends request on socket and waits for response) 1023 * 4) Decode SMB2 command specific fields in the fixed length area 1024 * 5) Decode variable length data area (if any for this SMB2 command type) 1025 * 6) Call free smb buffer 1026 * 7) return 1027 * 1028 */ 1029 1030 int 1031 SMB2_negotiate(const unsigned int xid, 1032 struct cifs_ses *ses, 1033 struct TCP_Server_Info *server) 1034 { 1035 struct smb_rqst rqst; 1036 struct smb2_negotiate_req *req; 1037 struct smb2_negotiate_rsp *rsp; 1038 struct kvec iov[1]; 1039 struct kvec rsp_iov; 1040 int rc; 1041 int resp_buftype; 1042 int blob_offset, blob_length; 1043 char *security_blob; 1044 int flags = CIFS_NEG_OP; 1045 unsigned int total_len; 1046 1047 cifs_dbg(FYI, "Negotiate protocol\n"); 1048 1049 if (!server) { 1050 WARN(1, "%s: server is NULL!\n", __func__); 1051 return -EIO; 1052 } 1053 1054 rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server, 1055 (void **) &req, &total_len); 1056 if (rc) 1057 return rc; 1058 1059 req->hdr.SessionId = 0; 1060 1061 memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE); 1062 memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE); 1063 1064 if (strcmp(server->vals->version_string, 1065 SMB3ANY_VERSION_STRING) == 0) { 1066 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); 1067 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); 1068 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID); 1069 req->DialectCount = cpu_to_le16(3); 1070 total_len += 6; 1071 } else if (strcmp(server->vals->version_string, 1072 SMBDEFAULT_VERSION_STRING) == 0) { 1073 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); 1074 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); 1075 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); 1076 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID); 1077 req->DialectCount = cpu_to_le16(4); 1078 total_len += 8; 1079 } else { 1080 /* otherwise send specific dialect */ 1081 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id); 1082 req->DialectCount = cpu_to_le16(1); 1083 total_len += 2; 1084 } 1085 1086 /* only one of SMB2 signing flags may be set in SMB2 request */ 1087 if (ses->sign) 1088 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); 1089 else if (global_secflags & CIFSSEC_MAY_SIGN) 1090 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); 1091 else 1092 req->SecurityMode = 0; 1093 1094 req->Capabilities = cpu_to_le32(server->vals->req_capabilities); 1095 if (ses->chan_max > 1) 1096 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL); 1097 1098 /* ClientGUID must be zero for SMB2.02 dialect */ 1099 if (server->vals->protocol_id == SMB20_PROT_ID) 1100 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE); 1101 else { 1102 memcpy(req->ClientGUID, server->client_guid, 1103 SMB2_CLIENT_GUID_SIZE); 1104 if ((server->vals->protocol_id == SMB311_PROT_ID) || 1105 (strcmp(server->vals->version_string, 1106 SMB3ANY_VERSION_STRING) == 0) || 1107 (strcmp(server->vals->version_string, 1108 SMBDEFAULT_VERSION_STRING) == 0)) 1109 assemble_neg_contexts(req, server, &total_len); 1110 } 1111 iov[0].iov_base = (char *)req; 1112 iov[0].iov_len = total_len; 1113 1114 memset(&rqst, 0, sizeof(struct smb_rqst)); 1115 rqst.rq_iov = iov; 1116 rqst.rq_nvec = 1; 1117 1118 rc = cifs_send_recv(xid, ses, server, 1119 &rqst, &resp_buftype, flags, &rsp_iov); 1120 cifs_small_buf_release(req); 1121 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base; 1122 /* 1123 * No tcon so can't do 1124 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); 1125 */ 1126 if (rc == -EOPNOTSUPP) { 1127 cifs_server_dbg(VFS, "Dialect not supported by server. Consider specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n"); 1128 goto neg_exit; 1129 } else if (rc != 0) 1130 goto neg_exit; 1131 1132 rc = -EIO; 1133 if (strcmp(server->vals->version_string, 1134 SMB3ANY_VERSION_STRING) == 0) { 1135 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) { 1136 cifs_server_dbg(VFS, 1137 "SMB2 dialect returned but not requested\n"); 1138 goto neg_exit; 1139 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) { 1140 cifs_server_dbg(VFS, 1141 "SMB2.1 dialect returned but not requested\n"); 1142 goto neg_exit; 1143 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) { 1144 /* ops set to 3.0 by default for default so update */ 1145 server->ops = &smb311_operations; 1146 server->vals = &smb311_values; 1147 } 1148 } else if (strcmp(server->vals->version_string, 1149 SMBDEFAULT_VERSION_STRING) == 0) { 1150 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) { 1151 cifs_server_dbg(VFS, 1152 "SMB2 dialect returned but not requested\n"); 1153 goto neg_exit; 1154 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) { 1155 /* ops set to 3.0 by default for default so update */ 1156 server->ops = &smb21_operations; 1157 server->vals = &smb21_values; 1158 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) { 1159 server->ops = &smb311_operations; 1160 server->vals = &smb311_values; 1161 } 1162 } else if (le16_to_cpu(rsp->DialectRevision) != 1163 server->vals->protocol_id) { 1164 /* if requested single dialect ensure returned dialect matched */ 1165 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n", 1166 le16_to_cpu(rsp->DialectRevision)); 1167 goto neg_exit; 1168 } 1169 1170 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode); 1171 1172 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) 1173 cifs_dbg(FYI, "negotiated smb2.0 dialect\n"); 1174 else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) 1175 cifs_dbg(FYI, "negotiated smb2.1 dialect\n"); 1176 else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID)) 1177 cifs_dbg(FYI, "negotiated smb3.0 dialect\n"); 1178 else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID)) 1179 cifs_dbg(FYI, "negotiated smb3.02 dialect\n"); 1180 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) 1181 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n"); 1182 else { 1183 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n", 1184 le16_to_cpu(rsp->DialectRevision)); 1185 goto neg_exit; 1186 } 1187 1188 rc = 0; 1189 server->dialect = le16_to_cpu(rsp->DialectRevision); 1190 1191 /* 1192 * Keep a copy of the hash after negprot. This hash will be 1193 * the starting hash value for all sessions made from this 1194 * server. 1195 */ 1196 memcpy(server->preauth_sha_hash, ses->preauth_sha_hash, 1197 SMB2_PREAUTH_HASH_SIZE); 1198 1199 /* SMB2 only has an extended negflavor */ 1200 server->negflavor = CIFS_NEGFLAVOR_EXTENDED; 1201 /* set it to the maximum buffer size value we can send with 1 credit */ 1202 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize), 1203 SMB2_MAX_BUFFER_SIZE); 1204 server->max_read = le32_to_cpu(rsp->MaxReadSize); 1205 server->max_write = le32_to_cpu(rsp->MaxWriteSize); 1206 server->sec_mode = le16_to_cpu(rsp->SecurityMode); 1207 if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode) 1208 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n", 1209 server->sec_mode); 1210 server->capabilities = le32_to_cpu(rsp->Capabilities); 1211 /* Internal types */ 1212 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES; 1213 1214 /* 1215 * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context 1216 * Set the cipher type manually. 1217 */ 1218 if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 1219 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM; 1220 1221 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length, 1222 (struct smb2_hdr *)rsp); 1223 /* 1224 * See MS-SMB2 section 2.2.4: if no blob, client picks default which 1225 * for us will be 1226 * ses->sectype = RawNTLMSSP; 1227 * but for time being this is our only auth choice so doesn't matter. 1228 * We just found a server which sets blob length to zero expecting raw. 1229 */ 1230 if (blob_length == 0) { 1231 cifs_dbg(FYI, "missing security blob on negprot\n"); 1232 server->sec_ntlmssp = true; 1233 } 1234 1235 rc = cifs_enable_signing(server, ses->sign); 1236 if (rc) 1237 goto neg_exit; 1238 if (blob_length) { 1239 rc = decode_negTokenInit(security_blob, blob_length, server); 1240 if (rc == 1) 1241 rc = 0; 1242 else if (rc == 0) 1243 rc = -EIO; 1244 } 1245 1246 if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) { 1247 if (rsp->NegotiateContextCount) 1248 rc = smb311_decode_neg_context(rsp, server, 1249 rsp_iov.iov_len); 1250 else 1251 cifs_server_dbg(VFS, "Missing expected negotiate contexts\n"); 1252 } 1253 neg_exit: 1254 free_rsp_buf(resp_buftype, rsp); 1255 return rc; 1256 } 1257 1258 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) 1259 { 1260 int rc; 1261 struct validate_negotiate_info_req *pneg_inbuf; 1262 struct validate_negotiate_info_rsp *pneg_rsp = NULL; 1263 u32 rsplen; 1264 u32 inbuflen; /* max of 4 dialects */ 1265 struct TCP_Server_Info *server = tcon->ses->server; 1266 1267 cifs_dbg(FYI, "validate negotiate\n"); 1268 1269 /* In SMB3.11 preauth integrity supersedes validate negotiate */ 1270 if (server->dialect == SMB311_PROT_ID) 1271 return 0; 1272 1273 /* 1274 * validation ioctl must be signed, so no point sending this if we 1275 * can not sign it (ie are not known user). Even if signing is not 1276 * required (enabled but not negotiated), in those cases we selectively 1277 * sign just this, the first and only signed request on a connection. 1278 * Having validation of negotiate info helps reduce attack vectors. 1279 */ 1280 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) 1281 return 0; /* validation requires signing */ 1282 1283 if (tcon->ses->user_name == NULL) { 1284 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n"); 1285 return 0; /* validation requires signing */ 1286 } 1287 1288 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL) 1289 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n"); 1290 1291 pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS); 1292 if (!pneg_inbuf) 1293 return -ENOMEM; 1294 1295 pneg_inbuf->Capabilities = 1296 cpu_to_le32(server->vals->req_capabilities); 1297 if (tcon->ses->chan_max > 1) 1298 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL); 1299 1300 memcpy(pneg_inbuf->Guid, server->client_guid, 1301 SMB2_CLIENT_GUID_SIZE); 1302 1303 if (tcon->ses->sign) 1304 pneg_inbuf->SecurityMode = 1305 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); 1306 else if (global_secflags & CIFSSEC_MAY_SIGN) 1307 pneg_inbuf->SecurityMode = 1308 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); 1309 else 1310 pneg_inbuf->SecurityMode = 0; 1311 1312 1313 if (strcmp(server->vals->version_string, 1314 SMB3ANY_VERSION_STRING) == 0) { 1315 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); 1316 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); 1317 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID); 1318 pneg_inbuf->DialectCount = cpu_to_le16(3); 1319 /* SMB 2.1 not included so subtract one dialect from len */ 1320 inbuflen = sizeof(*pneg_inbuf) - 1321 (sizeof(pneg_inbuf->Dialects[0])); 1322 } else if (strcmp(server->vals->version_string, 1323 SMBDEFAULT_VERSION_STRING) == 0) { 1324 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); 1325 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); 1326 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); 1327 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID); 1328 pneg_inbuf->DialectCount = cpu_to_le16(4); 1329 /* structure is big enough for 4 dialects */ 1330 inbuflen = sizeof(*pneg_inbuf); 1331 } else { 1332 /* otherwise specific dialect was requested */ 1333 pneg_inbuf->Dialects[0] = 1334 cpu_to_le16(server->vals->protocol_id); 1335 pneg_inbuf->DialectCount = cpu_to_le16(1); 1336 /* structure is big enough for 4 dialects, sending only 1 */ 1337 inbuflen = sizeof(*pneg_inbuf) - 1338 sizeof(pneg_inbuf->Dialects[0]) * 3; 1339 } 1340 1341 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, 1342 FSCTL_VALIDATE_NEGOTIATE_INFO, 1343 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize, 1344 (char **)&pneg_rsp, &rsplen); 1345 if (rc == -EOPNOTSUPP) { 1346 /* 1347 * Old Windows versions or Netapp SMB server can return 1348 * not supported error. Client should accept it. 1349 */ 1350 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n"); 1351 rc = 0; 1352 goto out_free_inbuf; 1353 } else if (rc != 0) { 1354 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n", 1355 rc); 1356 rc = -EIO; 1357 goto out_free_inbuf; 1358 } 1359 1360 rc = -EIO; 1361 if (rsplen != sizeof(*pneg_rsp)) { 1362 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n", 1363 rsplen); 1364 1365 /* relax check since Mac returns max bufsize allowed on ioctl */ 1366 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp)) 1367 goto out_free_rsp; 1368 } 1369 1370 /* check validate negotiate info response matches what we got earlier */ 1371 if (pneg_rsp->Dialect != cpu_to_le16(server->dialect)) 1372 goto vneg_out; 1373 1374 if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode)) 1375 goto vneg_out; 1376 1377 /* do not validate server guid because not saved at negprot time yet */ 1378 1379 if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND | 1380 SMB2_LARGE_FILES) != server->capabilities) 1381 goto vneg_out; 1382 1383 /* validate negotiate successful */ 1384 rc = 0; 1385 cifs_dbg(FYI, "validate negotiate info successful\n"); 1386 goto out_free_rsp; 1387 1388 vneg_out: 1389 cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n"); 1390 out_free_rsp: 1391 kfree(pneg_rsp); 1392 out_free_inbuf: 1393 kfree(pneg_inbuf); 1394 return rc; 1395 } 1396 1397 enum securityEnum 1398 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) 1399 { 1400 switch (requested) { 1401 case Kerberos: 1402 case RawNTLMSSP: 1403 return requested; 1404 case NTLMv2: 1405 return RawNTLMSSP; 1406 case Unspecified: 1407 if (server->sec_ntlmssp && 1408 (global_secflags & CIFSSEC_MAY_NTLMSSP)) 1409 return RawNTLMSSP; 1410 if ((server->sec_kerberos || server->sec_mskerberos) && 1411 (global_secflags & CIFSSEC_MAY_KRB5)) 1412 return Kerberos; 1413 fallthrough; 1414 default: 1415 return Unspecified; 1416 } 1417 } 1418 1419 struct SMB2_sess_data { 1420 unsigned int xid; 1421 struct cifs_ses *ses; 1422 struct TCP_Server_Info *server; 1423 struct nls_table *nls_cp; 1424 void (*func)(struct SMB2_sess_data *); 1425 int result; 1426 u64 previous_session; 1427 1428 /* we will send the SMB in three pieces: 1429 * a fixed length beginning part, an optional 1430 * SPNEGO blob (which can be zero length), and a 1431 * last part which will include the strings 1432 * and rest of bcc area. This allows us to avoid 1433 * a large buffer 17K allocation 1434 */ 1435 int buf0_type; 1436 struct kvec iov[2]; 1437 }; 1438 1439 static int 1440 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data) 1441 { 1442 int rc; 1443 struct cifs_ses *ses = sess_data->ses; 1444 struct TCP_Server_Info *server = sess_data->server; 1445 struct smb2_sess_setup_req *req; 1446 unsigned int total_len; 1447 bool is_binding = false; 1448 1449 rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server, 1450 (void **) &req, 1451 &total_len); 1452 if (rc) 1453 return rc; 1454 1455 spin_lock(&ses->ses_lock); 1456 is_binding = (ses->ses_status == SES_GOOD); 1457 spin_unlock(&ses->ses_lock); 1458 1459 if (is_binding) { 1460 req->hdr.SessionId = cpu_to_le64(ses->Suid); 1461 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 1462 req->PreviousSessionId = 0; 1463 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING; 1464 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid); 1465 } else { 1466 /* First session, not a reauthenticate */ 1467 req->hdr.SessionId = 0; 1468 /* 1469 * if reconnect, we need to send previous sess id 1470 * otherwise it is 0 1471 */ 1472 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session); 1473 req->Flags = 0; /* MBZ */ 1474 cifs_dbg(FYI, "Fresh session. Previous: %llx\n", 1475 sess_data->previous_session); 1476 } 1477 1478 /* enough to enable echos and oplocks and one max size write */ 1479 if (server->credits >= server->max_credits) 1480 req->hdr.CreditRequest = cpu_to_le16(0); 1481 else 1482 req->hdr.CreditRequest = cpu_to_le16( 1483 min_t(int, server->max_credits - 1484 server->credits, 130)); 1485 1486 /* only one of SMB2 signing flags may be set in SMB2 request */ 1487 if (server->sign) 1488 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED; 1489 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */ 1490 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED; 1491 else 1492 req->SecurityMode = 0; 1493 1494 #ifdef CONFIG_CIFS_DFS_UPCALL 1495 req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS); 1496 #else 1497 req->Capabilities = 0; 1498 #endif /* DFS_UPCALL */ 1499 1500 req->Channel = 0; /* MBZ */ 1501 1502 sess_data->iov[0].iov_base = (char *)req; 1503 /* 1 for pad */ 1504 sess_data->iov[0].iov_len = total_len - 1; 1505 /* 1506 * This variable will be used to clear the buffer 1507 * allocated above in case of any error in the calling function. 1508 */ 1509 sess_data->buf0_type = CIFS_SMALL_BUFFER; 1510 1511 return 0; 1512 } 1513 1514 static void 1515 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data) 1516 { 1517 struct kvec *iov = sess_data->iov; 1518 1519 /* iov[1] is already freed by caller */ 1520 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base) 1521 memzero_explicit(iov[0].iov_base, iov[0].iov_len); 1522 1523 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base); 1524 sess_data->buf0_type = CIFS_NO_BUFFER; 1525 } 1526 1527 static int 1528 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data) 1529 { 1530 int rc; 1531 struct smb_rqst rqst; 1532 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base; 1533 struct kvec rsp_iov = { NULL, 0 }; 1534 1535 /* Testing shows that buffer offset must be at location of Buffer[0] */ 1536 req->SecurityBufferOffset = 1537 cpu_to_le16(sizeof(struct smb2_sess_setup_req)); 1538 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len); 1539 1540 memset(&rqst, 0, sizeof(struct smb_rqst)); 1541 rqst.rq_iov = sess_data->iov; 1542 rqst.rq_nvec = 2; 1543 1544 /* BB add code to build os and lm fields */ 1545 rc = cifs_send_recv(sess_data->xid, sess_data->ses, 1546 sess_data->server, 1547 &rqst, 1548 &sess_data->buf0_type, 1549 CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov); 1550 cifs_small_buf_release(sess_data->iov[0].iov_base); 1551 if (rc == 0) 1552 sess_data->ses->expired_pwd = false; 1553 else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) 1554 sess_data->ses->expired_pwd = true; 1555 1556 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec)); 1557 1558 return rc; 1559 } 1560 1561 static int 1562 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data) 1563 { 1564 int rc = 0; 1565 struct cifs_ses *ses = sess_data->ses; 1566 struct TCP_Server_Info *server = sess_data->server; 1567 1568 cifs_server_lock(server); 1569 if (server->ops->generate_signingkey) { 1570 rc = server->ops->generate_signingkey(ses, server); 1571 if (rc) { 1572 cifs_dbg(FYI, 1573 "SMB3 session key generation failed\n"); 1574 cifs_server_unlock(server); 1575 return rc; 1576 } 1577 } 1578 if (!server->session_estab) { 1579 server->sequence_number = 0x2; 1580 server->session_estab = true; 1581 } 1582 cifs_server_unlock(server); 1583 1584 cifs_dbg(FYI, "SMB2/3 session established successfully\n"); 1585 return rc; 1586 } 1587 1588 #ifdef CONFIG_CIFS_UPCALL 1589 static void 1590 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) 1591 { 1592 int rc; 1593 struct cifs_ses *ses = sess_data->ses; 1594 struct TCP_Server_Info *server = sess_data->server; 1595 struct cifs_spnego_msg *msg; 1596 struct key *spnego_key = NULL; 1597 struct smb2_sess_setup_rsp *rsp = NULL; 1598 bool is_binding = false; 1599 1600 rc = SMB2_sess_alloc_buffer(sess_data); 1601 if (rc) 1602 goto out; 1603 1604 spnego_key = cifs_get_spnego_key(ses, server); 1605 if (IS_ERR(spnego_key)) { 1606 rc = PTR_ERR(spnego_key); 1607 if (rc == -ENOKEY) 1608 cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n"); 1609 spnego_key = NULL; 1610 goto out; 1611 } 1612 1613 msg = spnego_key->payload.data[0]; 1614 /* 1615 * check version field to make sure that cifs.upcall is 1616 * sending us a response in an expected form 1617 */ 1618 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 1619 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n", 1620 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 1621 rc = -EKEYREJECTED; 1622 goto out_put_spnego_key; 1623 } 1624 1625 spin_lock(&ses->ses_lock); 1626 is_binding = (ses->ses_status == SES_GOOD); 1627 spin_unlock(&ses->ses_lock); 1628 1629 /* keep session key if binding */ 1630 if (!is_binding) { 1631 kfree_sensitive(ses->auth_key.response); 1632 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, 1633 GFP_KERNEL); 1634 if (!ses->auth_key.response) { 1635 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n", 1636 msg->sesskey_len); 1637 rc = -ENOMEM; 1638 goto out_put_spnego_key; 1639 } 1640 ses->auth_key.len = msg->sesskey_len; 1641 } 1642 1643 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; 1644 sess_data->iov[1].iov_len = msg->secblob_len; 1645 1646 rc = SMB2_sess_sendreceive(sess_data); 1647 if (rc) 1648 goto out_put_spnego_key; 1649 1650 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; 1651 /* keep session id and flags if binding */ 1652 if (!is_binding) { 1653 ses->Suid = le64_to_cpu(rsp->hdr.SessionId); 1654 ses->session_flags = le16_to_cpu(rsp->SessionFlags); 1655 } 1656 1657 rc = SMB2_sess_establish_session(sess_data); 1658 out_put_spnego_key: 1659 key_invalidate(spnego_key); 1660 key_put(spnego_key); 1661 if (rc) { 1662 kfree_sensitive(ses->auth_key.response); 1663 ses->auth_key.response = NULL; 1664 ses->auth_key.len = 0; 1665 } 1666 out: 1667 sess_data->result = rc; 1668 sess_data->func = NULL; 1669 SMB2_sess_free_buffer(sess_data); 1670 } 1671 #else 1672 static void 1673 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) 1674 { 1675 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); 1676 sess_data->result = -EOPNOTSUPP; 1677 sess_data->func = NULL; 1678 } 1679 #endif 1680 1681 static void 1682 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data); 1683 1684 static void 1685 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data) 1686 { 1687 int rc; 1688 struct cifs_ses *ses = sess_data->ses; 1689 struct TCP_Server_Info *server = sess_data->server; 1690 struct smb2_sess_setup_rsp *rsp = NULL; 1691 unsigned char *ntlmssp_blob = NULL; 1692 bool use_spnego = false; /* else use raw ntlmssp */ 1693 u16 blob_length = 0; 1694 bool is_binding = false; 1695 1696 /* 1697 * If memory allocation is successful, caller of this function 1698 * frees it. 1699 */ 1700 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); 1701 if (!ses->ntlmssp) { 1702 rc = -ENOMEM; 1703 goto out_err; 1704 } 1705 ses->ntlmssp->sesskey_per_smbsess = true; 1706 1707 rc = SMB2_sess_alloc_buffer(sess_data); 1708 if (rc) 1709 goto out_err; 1710 1711 rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob, 1712 &blob_length, ses, server, 1713 sess_data->nls_cp); 1714 if (rc) 1715 goto out; 1716 1717 if (use_spnego) { 1718 /* BB eventually need to add this */ 1719 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); 1720 rc = -EOPNOTSUPP; 1721 goto out; 1722 } 1723 sess_data->iov[1].iov_base = ntlmssp_blob; 1724 sess_data->iov[1].iov_len = blob_length; 1725 1726 rc = SMB2_sess_sendreceive(sess_data); 1727 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; 1728 1729 /* If true, rc here is expected and not an error */ 1730 if (sess_data->buf0_type != CIFS_NO_BUFFER && 1731 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) 1732 rc = 0; 1733 1734 if (rc) 1735 goto out; 1736 1737 if (offsetof(struct smb2_sess_setup_rsp, Buffer) != 1738 le16_to_cpu(rsp->SecurityBufferOffset)) { 1739 cifs_dbg(VFS, "Invalid security buffer offset %d\n", 1740 le16_to_cpu(rsp->SecurityBufferOffset)); 1741 rc = -EIO; 1742 goto out; 1743 } 1744 rc = decode_ntlmssp_challenge(rsp->Buffer, 1745 le16_to_cpu(rsp->SecurityBufferLength), ses); 1746 if (rc) 1747 goto out; 1748 1749 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); 1750 1751 spin_lock(&ses->ses_lock); 1752 is_binding = (ses->ses_status == SES_GOOD); 1753 spin_unlock(&ses->ses_lock); 1754 1755 /* keep existing ses id and flags if binding */ 1756 if (!is_binding) { 1757 ses->Suid = le64_to_cpu(rsp->hdr.SessionId); 1758 ses->session_flags = le16_to_cpu(rsp->SessionFlags); 1759 } 1760 1761 out: 1762 kfree_sensitive(ntlmssp_blob); 1763 SMB2_sess_free_buffer(sess_data); 1764 if (!rc) { 1765 sess_data->result = 0; 1766 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate; 1767 return; 1768 } 1769 out_err: 1770 kfree_sensitive(ses->ntlmssp); 1771 ses->ntlmssp = NULL; 1772 sess_data->result = rc; 1773 sess_data->func = NULL; 1774 } 1775 1776 static void 1777 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data) 1778 { 1779 int rc; 1780 struct cifs_ses *ses = sess_data->ses; 1781 struct TCP_Server_Info *server = sess_data->server; 1782 struct smb2_sess_setup_req *req; 1783 struct smb2_sess_setup_rsp *rsp = NULL; 1784 unsigned char *ntlmssp_blob = NULL; 1785 bool use_spnego = false; /* else use raw ntlmssp */ 1786 u16 blob_length = 0; 1787 bool is_binding = false; 1788 1789 rc = SMB2_sess_alloc_buffer(sess_data); 1790 if (rc) 1791 goto out; 1792 1793 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base; 1794 req->hdr.SessionId = cpu_to_le64(ses->Suid); 1795 1796 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, 1797 ses, server, 1798 sess_data->nls_cp); 1799 if (rc) { 1800 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc); 1801 goto out; 1802 } 1803 1804 if (use_spnego) { 1805 /* BB eventually need to add this */ 1806 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); 1807 rc = -EOPNOTSUPP; 1808 goto out; 1809 } 1810 sess_data->iov[1].iov_base = ntlmssp_blob; 1811 sess_data->iov[1].iov_len = blob_length; 1812 1813 rc = SMB2_sess_sendreceive(sess_data); 1814 if (rc) 1815 goto out; 1816 1817 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; 1818 1819 spin_lock(&ses->ses_lock); 1820 is_binding = (ses->ses_status == SES_GOOD); 1821 spin_unlock(&ses->ses_lock); 1822 1823 /* keep existing ses id and flags if binding */ 1824 if (!is_binding) { 1825 ses->Suid = le64_to_cpu(rsp->hdr.SessionId); 1826 ses->session_flags = le16_to_cpu(rsp->SessionFlags); 1827 } 1828 1829 rc = SMB2_sess_establish_session(sess_data); 1830 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS 1831 if (ses->server->dialect < SMB30_PROT_ID) { 1832 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__); 1833 /* 1834 * The session id is opaque in terms of endianness, so we can't 1835 * print it as a long long. we dump it as we got it on the wire 1836 */ 1837 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid), 1838 &ses->Suid); 1839 cifs_dbg(VFS, "Session Key %*ph\n", 1840 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response); 1841 cifs_dbg(VFS, "Signing Key %*ph\n", 1842 SMB3_SIGN_KEY_SIZE, ses->auth_key.response); 1843 } 1844 #endif 1845 out: 1846 kfree_sensitive(ntlmssp_blob); 1847 SMB2_sess_free_buffer(sess_data); 1848 kfree_sensitive(ses->ntlmssp); 1849 ses->ntlmssp = NULL; 1850 sess_data->result = rc; 1851 sess_data->func = NULL; 1852 } 1853 1854 static int 1855 SMB2_select_sec(struct SMB2_sess_data *sess_data) 1856 { 1857 int type; 1858 struct cifs_ses *ses = sess_data->ses; 1859 struct TCP_Server_Info *server = sess_data->server; 1860 1861 type = smb2_select_sectype(server, ses->sectype); 1862 cifs_dbg(FYI, "sess setup type %d\n", type); 1863 if (type == Unspecified) { 1864 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n"); 1865 return -EINVAL; 1866 } 1867 1868 switch (type) { 1869 case Kerberos: 1870 sess_data->func = SMB2_auth_kerberos; 1871 break; 1872 case RawNTLMSSP: 1873 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate; 1874 break; 1875 default: 1876 cifs_dbg(VFS, "secType %d not supported!\n", type); 1877 return -EOPNOTSUPP; 1878 } 1879 1880 return 0; 1881 } 1882 1883 int 1884 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses, 1885 struct TCP_Server_Info *server, 1886 const struct nls_table *nls_cp) 1887 { 1888 int rc = 0; 1889 struct SMB2_sess_data *sess_data; 1890 1891 cifs_dbg(FYI, "Session Setup\n"); 1892 1893 if (!server) { 1894 WARN(1, "%s: server is NULL!\n", __func__); 1895 return -EIO; 1896 } 1897 1898 sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL); 1899 if (!sess_data) 1900 return -ENOMEM; 1901 1902 sess_data->xid = xid; 1903 sess_data->ses = ses; 1904 sess_data->server = server; 1905 sess_data->buf0_type = CIFS_NO_BUFFER; 1906 sess_data->nls_cp = (struct nls_table *) nls_cp; 1907 sess_data->previous_session = ses->Suid; 1908 1909 rc = SMB2_select_sec(sess_data); 1910 if (rc) 1911 goto out; 1912 1913 /* 1914 * Initialize the session hash with the server one. 1915 */ 1916 memcpy(ses->preauth_sha_hash, server->preauth_sha_hash, 1917 SMB2_PREAUTH_HASH_SIZE); 1918 1919 while (sess_data->func) 1920 sess_data->func(sess_data); 1921 1922 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign)) 1923 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n"); 1924 rc = sess_data->result; 1925 out: 1926 kfree_sensitive(sess_data); 1927 return rc; 1928 } 1929 1930 int 1931 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses) 1932 { 1933 struct smb_rqst rqst; 1934 struct smb2_logoff_req *req; /* response is also trivial struct */ 1935 int rc = 0; 1936 struct TCP_Server_Info *server; 1937 int flags = 0; 1938 unsigned int total_len; 1939 struct kvec iov[1]; 1940 struct kvec rsp_iov; 1941 int resp_buf_type; 1942 1943 cifs_dbg(FYI, "disconnect session %p\n", ses); 1944 1945 if (ses && (ses->server)) 1946 server = ses->server; 1947 else 1948 return -EIO; 1949 1950 /* no need to send SMB logoff if uid already closed due to reconnect */ 1951 spin_lock(&ses->chan_lock); 1952 if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) { 1953 spin_unlock(&ses->chan_lock); 1954 goto smb2_session_already_dead; 1955 } 1956 spin_unlock(&ses->chan_lock); 1957 1958 rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server, 1959 (void **) &req, &total_len); 1960 if (rc) 1961 return rc; 1962 1963 /* since no tcon, smb2_init can not do this, so do here */ 1964 req->hdr.SessionId = cpu_to_le64(ses->Suid); 1965 1966 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) 1967 flags |= CIFS_TRANSFORM_REQ; 1968 else if (server->sign) 1969 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 1970 1971 flags |= CIFS_NO_RSP_BUF; 1972 1973 iov[0].iov_base = (char *)req; 1974 iov[0].iov_len = total_len; 1975 1976 memset(&rqst, 0, sizeof(struct smb_rqst)); 1977 rqst.rq_iov = iov; 1978 rqst.rq_nvec = 1; 1979 1980 rc = cifs_send_recv(xid, ses, ses->server, 1981 &rqst, &resp_buf_type, flags, &rsp_iov); 1982 cifs_small_buf_release(req); 1983 /* 1984 * No tcon so can't do 1985 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); 1986 */ 1987 1988 smb2_session_already_dead: 1989 return rc; 1990 } 1991 1992 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code) 1993 { 1994 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]); 1995 } 1996 1997 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */) 1998 1999 /* These are similar values to what Windows uses */ 2000 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon) 2001 { 2002 tcon->max_chunks = 256; 2003 tcon->max_bytes_chunk = 1048576; 2004 tcon->max_bytes_copy = 16777216; 2005 } 2006 2007 int 2008 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree, 2009 struct cifs_tcon *tcon, const struct nls_table *cp) 2010 { 2011 struct smb_rqst rqst; 2012 struct smb2_tree_connect_req *req; 2013 struct smb2_tree_connect_rsp *rsp = NULL; 2014 struct kvec iov[2]; 2015 struct kvec rsp_iov = { NULL, 0 }; 2016 int rc = 0; 2017 int resp_buftype; 2018 int unc_path_len; 2019 __le16 *unc_path = NULL; 2020 int flags = 0; 2021 unsigned int total_len; 2022 struct TCP_Server_Info *server = cifs_pick_channel(ses); 2023 2024 cifs_dbg(FYI, "TCON\n"); 2025 2026 if (!server || !tree) 2027 return -EIO; 2028 2029 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL); 2030 if (unc_path == NULL) 2031 return -ENOMEM; 2032 2033 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp); 2034 if (unc_path_len <= 0) { 2035 kfree(unc_path); 2036 return -EINVAL; 2037 } 2038 unc_path_len *= 2; 2039 2040 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */ 2041 tcon->tid = 0; 2042 atomic_set(&tcon->num_remote_opens, 0); 2043 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server, 2044 (void **) &req, &total_len); 2045 if (rc) { 2046 kfree(unc_path); 2047 return rc; 2048 } 2049 2050 if (smb3_encryption_required(tcon)) 2051 flags |= CIFS_TRANSFORM_REQ; 2052 2053 iov[0].iov_base = (char *)req; 2054 /* 1 for pad */ 2055 iov[0].iov_len = total_len - 1; 2056 2057 /* Testing shows that buffer offset must be at location of Buffer[0] */ 2058 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)); 2059 req->PathLength = cpu_to_le16(unc_path_len); 2060 iov[1].iov_base = unc_path; 2061 iov[1].iov_len = unc_path_len; 2062 2063 /* 2064 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 2065 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1 2066 * (Samba servers don't always set the flag so also check if null user) 2067 */ 2068 if ((server->dialect == SMB311_PROT_ID) && 2069 !smb3_encryption_required(tcon) && 2070 !(ses->session_flags & 2071 (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) && 2072 ((ses->user_name != NULL) || (ses->sectype == Kerberos))) 2073 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 2074 2075 memset(&rqst, 0, sizeof(struct smb_rqst)); 2076 rqst.rq_iov = iov; 2077 rqst.rq_nvec = 2; 2078 2079 /* Need 64 for max size write so ask for more in case not there yet */ 2080 if (server->credits >= server->max_credits) 2081 req->hdr.CreditRequest = cpu_to_le16(0); 2082 else 2083 req->hdr.CreditRequest = cpu_to_le16( 2084 min_t(int, server->max_credits - 2085 server->credits, 64)); 2086 2087 rc = cifs_send_recv(xid, ses, server, 2088 &rqst, &resp_buftype, flags, &rsp_iov); 2089 cifs_small_buf_release(req); 2090 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base; 2091 trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc); 2092 if ((rc != 0) || (rsp == NULL)) { 2093 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE); 2094 tcon->need_reconnect = true; 2095 goto tcon_error_exit; 2096 } 2097 2098 switch (rsp->ShareType) { 2099 case SMB2_SHARE_TYPE_DISK: 2100 cifs_dbg(FYI, "connection to disk share\n"); 2101 break; 2102 case SMB2_SHARE_TYPE_PIPE: 2103 tcon->pipe = true; 2104 cifs_dbg(FYI, "connection to pipe share\n"); 2105 break; 2106 case SMB2_SHARE_TYPE_PRINT: 2107 tcon->print = true; 2108 cifs_dbg(FYI, "connection to printer\n"); 2109 break; 2110 default: 2111 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType); 2112 rc = -EOPNOTSUPP; 2113 goto tcon_error_exit; 2114 } 2115 2116 tcon->share_flags = le32_to_cpu(rsp->ShareFlags); 2117 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */ 2118 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess); 2119 tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId); 2120 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name)); 2121 2122 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) && 2123 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0)) 2124 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n"); 2125 2126 if (tcon->seal && 2127 !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 2128 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n"); 2129 2130 init_copy_chunk_defaults(tcon); 2131 if (server->ops->validate_negotiate) 2132 rc = server->ops->validate_negotiate(xid, tcon); 2133 if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */ 2134 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT) 2135 server->nosharesock = true; 2136 tcon_exit: 2137 2138 free_rsp_buf(resp_buftype, rsp); 2139 kfree(unc_path); 2140 return rc; 2141 2142 tcon_error_exit: 2143 if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) 2144 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree); 2145 goto tcon_exit; 2146 } 2147 2148 int 2149 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon) 2150 { 2151 struct smb_rqst rqst; 2152 struct smb2_tree_disconnect_req *req; /* response is trivial */ 2153 int rc = 0; 2154 struct cifs_ses *ses = tcon->ses; 2155 struct TCP_Server_Info *server = cifs_pick_channel(ses); 2156 int flags = 0; 2157 unsigned int total_len; 2158 struct kvec iov[1]; 2159 struct kvec rsp_iov; 2160 int resp_buf_type; 2161 2162 cifs_dbg(FYI, "Tree Disconnect\n"); 2163 2164 if (!ses || !(ses->server)) 2165 return -EIO; 2166 2167 trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name); 2168 spin_lock(&ses->chan_lock); 2169 if ((tcon->need_reconnect) || 2170 (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) { 2171 spin_unlock(&ses->chan_lock); 2172 return 0; 2173 } 2174 spin_unlock(&ses->chan_lock); 2175 2176 invalidate_all_cached_dirs(tcon); 2177 2178 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server, 2179 (void **) &req, 2180 &total_len); 2181 if (rc) 2182 return rc; 2183 2184 if (smb3_encryption_required(tcon)) 2185 flags |= CIFS_TRANSFORM_REQ; 2186 2187 flags |= CIFS_NO_RSP_BUF; 2188 2189 iov[0].iov_base = (char *)req; 2190 iov[0].iov_len = total_len; 2191 2192 memset(&rqst, 0, sizeof(struct smb_rqst)); 2193 rqst.rq_iov = iov; 2194 rqst.rq_nvec = 1; 2195 2196 rc = cifs_send_recv(xid, ses, server, 2197 &rqst, &resp_buf_type, flags, &rsp_iov); 2198 cifs_small_buf_release(req); 2199 if (rc) { 2200 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE); 2201 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc); 2202 } 2203 trace_smb3_tdis_done(xid, tcon->tid, ses->Suid); 2204 2205 return rc; 2206 } 2207 2208 2209 static struct create_durable * 2210 create_durable_buf(void) 2211 { 2212 struct create_durable *buf; 2213 2214 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL); 2215 if (!buf) 2216 return NULL; 2217 2218 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2219 (struct create_durable, Data)); 2220 buf->ccontext.DataLength = cpu_to_le32(16); 2221 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2222 (struct create_durable, Name)); 2223 buf->ccontext.NameLength = cpu_to_le16(4); 2224 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */ 2225 buf->Name[0] = 'D'; 2226 buf->Name[1] = 'H'; 2227 buf->Name[2] = 'n'; 2228 buf->Name[3] = 'Q'; 2229 return buf; 2230 } 2231 2232 static struct create_durable * 2233 create_reconnect_durable_buf(struct cifs_fid *fid) 2234 { 2235 struct create_durable *buf; 2236 2237 buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL); 2238 if (!buf) 2239 return NULL; 2240 2241 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2242 (struct create_durable, Data)); 2243 buf->ccontext.DataLength = cpu_to_le32(16); 2244 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2245 (struct create_durable, Name)); 2246 buf->ccontext.NameLength = cpu_to_le16(4); 2247 buf->Data.Fid.PersistentFileId = fid->persistent_fid; 2248 buf->Data.Fid.VolatileFileId = fid->volatile_fid; 2249 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */ 2250 buf->Name[0] = 'D'; 2251 buf->Name[1] = 'H'; 2252 buf->Name[2] = 'n'; 2253 buf->Name[3] = 'C'; 2254 return buf; 2255 } 2256 2257 static void 2258 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf) 2259 { 2260 struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc; 2261 2262 cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n", 2263 pdisk_id->DiskFileId, pdisk_id->VolumeId); 2264 buf->IndexNumber = pdisk_id->DiskFileId; 2265 } 2266 2267 static void 2268 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info, 2269 struct create_posix_rsp *posix) 2270 { 2271 int sid_len; 2272 u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset); 2273 u8 *end = beg + le32_to_cpu(cc->DataLength); 2274 u8 *sid; 2275 2276 memset(posix, 0, sizeof(*posix)); 2277 2278 posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0)); 2279 posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4)); 2280 posix->mode = le32_to_cpu(*(__le32 *)(beg + 8)); 2281 2282 sid = beg + 12; 2283 sid_len = posix_info_sid_size(sid, end); 2284 if (sid_len < 0) { 2285 cifs_dbg(VFS, "bad owner sid in posix create response\n"); 2286 return; 2287 } 2288 memcpy(&posix->owner, sid, sid_len); 2289 2290 sid = sid + sid_len; 2291 sid_len = posix_info_sid_size(sid, end); 2292 if (sid_len < 0) { 2293 cifs_dbg(VFS, "bad group sid in posix create response\n"); 2294 return; 2295 } 2296 memcpy(&posix->group, sid, sid_len); 2297 2298 cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n", 2299 posix->nlink, posix->mode, posix->reparse_tag); 2300 } 2301 2302 int smb2_parse_contexts(struct TCP_Server_Info *server, 2303 struct kvec *rsp_iov, 2304 unsigned int *epoch, 2305 char *lease_key, __u8 *oplock, 2306 struct smb2_file_all_info *buf, 2307 struct create_posix_rsp *posix) 2308 { 2309 struct smb2_create_rsp *rsp = rsp_iov->iov_base; 2310 struct create_context *cc; 2311 size_t rem, off, len; 2312 size_t doff, dlen; 2313 size_t noff, nlen; 2314 char *name; 2315 static const char smb3_create_tag_posix[] = { 2316 0x93, 0xAD, 0x25, 0x50, 0x9C, 2317 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83, 2318 0xDE, 0x96, 0x8B, 0xCD, 0x7C 2319 }; 2320 2321 *oplock = 0; 2322 2323 off = le32_to_cpu(rsp->CreateContextsOffset); 2324 rem = le32_to_cpu(rsp->CreateContextsLength); 2325 if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len) 2326 return -EINVAL; 2327 cc = (struct create_context *)((u8 *)rsp + off); 2328 2329 /* Initialize inode number to 0 in case no valid data in qfid context */ 2330 if (buf) 2331 buf->IndexNumber = 0; 2332 2333 while (rem >= sizeof(*cc)) { 2334 doff = le16_to_cpu(cc->DataOffset); 2335 dlen = le32_to_cpu(cc->DataLength); 2336 if (check_add_overflow(doff, dlen, &len) || len > rem) 2337 return -EINVAL; 2338 2339 noff = le16_to_cpu(cc->NameOffset); 2340 nlen = le16_to_cpu(cc->NameLength); 2341 if (noff + nlen > doff) 2342 return -EINVAL; 2343 2344 name = (char *)cc + noff; 2345 switch (nlen) { 2346 case 4: 2347 if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) { 2348 *oplock = server->ops->parse_lease_buf(cc, epoch, 2349 lease_key); 2350 } else if (buf && 2351 !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) { 2352 parse_query_id_ctxt(cc, buf); 2353 } 2354 break; 2355 case 16: 2356 if (posix && !memcmp(name, smb3_create_tag_posix, 16)) 2357 parse_posix_ctxt(cc, buf, posix); 2358 break; 2359 default: 2360 cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n", 2361 __func__, nlen, dlen); 2362 if (IS_ENABLED(CONFIG_CIFS_DEBUG2)) 2363 cifs_dump_mem("context data: ", cc, dlen); 2364 break; 2365 } 2366 2367 off = le32_to_cpu(cc->Next); 2368 if (!off) 2369 break; 2370 if (check_sub_overflow(rem, off, &rem)) 2371 return -EINVAL; 2372 cc = (struct create_context *)((u8 *)cc + off); 2373 } 2374 2375 if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE) 2376 *oplock = rsp->OplockLevel; 2377 2378 return 0; 2379 } 2380 2381 static int 2382 add_lease_context(struct TCP_Server_Info *server, 2383 struct smb2_create_req *req, 2384 struct kvec *iov, 2385 unsigned int *num_iovec, u8 *lease_key, __u8 *oplock) 2386 { 2387 unsigned int num = *num_iovec; 2388 2389 iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock); 2390 if (iov[num].iov_base == NULL) 2391 return -ENOMEM; 2392 iov[num].iov_len = server->vals->create_lease_size; 2393 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE; 2394 *num_iovec = num + 1; 2395 return 0; 2396 } 2397 2398 static struct create_durable_v2 * 2399 create_durable_v2_buf(struct cifs_open_parms *oparms) 2400 { 2401 struct cifs_fid *pfid = oparms->fid; 2402 struct create_durable_v2 *buf; 2403 2404 buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL); 2405 if (!buf) 2406 return NULL; 2407 2408 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2409 (struct create_durable_v2, dcontext)); 2410 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2)); 2411 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2412 (struct create_durable_v2, Name)); 2413 buf->ccontext.NameLength = cpu_to_le16(4); 2414 2415 /* 2416 * NB: Handle timeout defaults to 0, which allows server to choose 2417 * (most servers default to 120 seconds) and most clients default to 0. 2418 * This can be overridden at mount ("handletimeout=") if the user wants 2419 * a different persistent (or resilient) handle timeout for all opens 2420 * on a particular SMB3 mount. 2421 */ 2422 buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout); 2423 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); 2424 generate_random_uuid(buf->dcontext.CreateGuid); 2425 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16); 2426 2427 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */ 2428 buf->Name[0] = 'D'; 2429 buf->Name[1] = 'H'; 2430 buf->Name[2] = '2'; 2431 buf->Name[3] = 'Q'; 2432 return buf; 2433 } 2434 2435 static struct create_durable_handle_reconnect_v2 * 2436 create_reconnect_durable_v2_buf(struct cifs_fid *fid) 2437 { 2438 struct create_durable_handle_reconnect_v2 *buf; 2439 2440 buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2), 2441 GFP_KERNEL); 2442 if (!buf) 2443 return NULL; 2444 2445 buf->ccontext.DataOffset = 2446 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, 2447 dcontext)); 2448 buf->ccontext.DataLength = 2449 cpu_to_le32(sizeof(struct durable_reconnect_context_v2)); 2450 buf->ccontext.NameOffset = 2451 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, 2452 Name)); 2453 buf->ccontext.NameLength = cpu_to_le16(4); 2454 2455 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid; 2456 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid; 2457 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); 2458 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16); 2459 2460 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */ 2461 buf->Name[0] = 'D'; 2462 buf->Name[1] = 'H'; 2463 buf->Name[2] = '2'; 2464 buf->Name[3] = 'C'; 2465 return buf; 2466 } 2467 2468 static int 2469 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec, 2470 struct cifs_open_parms *oparms) 2471 { 2472 unsigned int num = *num_iovec; 2473 2474 iov[num].iov_base = create_durable_v2_buf(oparms); 2475 if (iov[num].iov_base == NULL) 2476 return -ENOMEM; 2477 iov[num].iov_len = sizeof(struct create_durable_v2); 2478 *num_iovec = num + 1; 2479 return 0; 2480 } 2481 2482 static int 2483 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec, 2484 struct cifs_open_parms *oparms) 2485 { 2486 unsigned int num = *num_iovec; 2487 2488 /* indicate that we don't need to relock the file */ 2489 oparms->reconnect = false; 2490 2491 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid); 2492 if (iov[num].iov_base == NULL) 2493 return -ENOMEM; 2494 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2); 2495 *num_iovec = num + 1; 2496 return 0; 2497 } 2498 2499 static int 2500 add_durable_context(struct kvec *iov, unsigned int *num_iovec, 2501 struct cifs_open_parms *oparms, bool use_persistent) 2502 { 2503 unsigned int num = *num_iovec; 2504 2505 if (use_persistent) { 2506 if (oparms->reconnect) 2507 return add_durable_reconnect_v2_context(iov, num_iovec, 2508 oparms); 2509 else 2510 return add_durable_v2_context(iov, num_iovec, oparms); 2511 } 2512 2513 if (oparms->reconnect) { 2514 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid); 2515 /* indicate that we don't need to relock the file */ 2516 oparms->reconnect = false; 2517 } else 2518 iov[num].iov_base = create_durable_buf(); 2519 if (iov[num].iov_base == NULL) 2520 return -ENOMEM; 2521 iov[num].iov_len = sizeof(struct create_durable); 2522 *num_iovec = num + 1; 2523 return 0; 2524 } 2525 2526 /* See MS-SMB2 2.2.13.2.7 */ 2527 static struct crt_twarp_ctxt * 2528 create_twarp_buf(__u64 timewarp) 2529 { 2530 struct crt_twarp_ctxt *buf; 2531 2532 buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL); 2533 if (!buf) 2534 return NULL; 2535 2536 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2537 (struct crt_twarp_ctxt, Timestamp)); 2538 buf->ccontext.DataLength = cpu_to_le32(8); 2539 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2540 (struct crt_twarp_ctxt, Name)); 2541 buf->ccontext.NameLength = cpu_to_le16(4); 2542 /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */ 2543 buf->Name[0] = 'T'; 2544 buf->Name[1] = 'W'; 2545 buf->Name[2] = 'r'; 2546 buf->Name[3] = 'p'; 2547 buf->Timestamp = cpu_to_le64(timewarp); 2548 return buf; 2549 } 2550 2551 /* See MS-SMB2 2.2.13.2.7 */ 2552 static int 2553 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp) 2554 { 2555 unsigned int num = *num_iovec; 2556 2557 iov[num].iov_base = create_twarp_buf(timewarp); 2558 if (iov[num].iov_base == NULL) 2559 return -ENOMEM; 2560 iov[num].iov_len = sizeof(struct crt_twarp_ctxt); 2561 *num_iovec = num + 1; 2562 return 0; 2563 } 2564 2565 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */ 2566 static void setup_owner_group_sids(char *buf) 2567 { 2568 struct owner_group_sids *sids = (struct owner_group_sids *)buf; 2569 2570 /* Populate the user ownership fields S-1-5-88-1 */ 2571 sids->owner.Revision = 1; 2572 sids->owner.NumAuth = 3; 2573 sids->owner.Authority[5] = 5; 2574 sids->owner.SubAuthorities[0] = cpu_to_le32(88); 2575 sids->owner.SubAuthorities[1] = cpu_to_le32(1); 2576 sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val); 2577 2578 /* Populate the group ownership fields S-1-5-88-2 */ 2579 sids->group.Revision = 1; 2580 sids->group.NumAuth = 3; 2581 sids->group.Authority[5] = 5; 2582 sids->group.SubAuthorities[0] = cpu_to_le32(88); 2583 sids->group.SubAuthorities[1] = cpu_to_le32(2); 2584 sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val); 2585 2586 cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val); 2587 } 2588 2589 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */ 2590 static struct crt_sd_ctxt * 2591 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len) 2592 { 2593 struct crt_sd_ctxt *buf; 2594 __u8 *ptr, *aclptr; 2595 unsigned int acelen, acl_size, ace_count; 2596 unsigned int owner_offset = 0; 2597 unsigned int group_offset = 0; 2598 struct smb3_acl acl = {}; 2599 2600 *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8); 2601 2602 if (set_owner) { 2603 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */ 2604 *len += sizeof(struct owner_group_sids); 2605 } 2606 2607 buf = kzalloc(*len, GFP_KERNEL); 2608 if (buf == NULL) 2609 return buf; 2610 2611 ptr = (__u8 *)&buf[1]; 2612 if (set_owner) { 2613 /* offset fields are from beginning of security descriptor not of create context */ 2614 owner_offset = ptr - (__u8 *)&buf->sd; 2615 buf->sd.OffsetOwner = cpu_to_le32(owner_offset); 2616 group_offset = owner_offset + offsetof(struct owner_group_sids, group); 2617 buf->sd.OffsetGroup = cpu_to_le32(group_offset); 2618 2619 setup_owner_group_sids(ptr); 2620 ptr += sizeof(struct owner_group_sids); 2621 } else { 2622 buf->sd.OffsetOwner = 0; 2623 buf->sd.OffsetGroup = 0; 2624 } 2625 2626 buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd)); 2627 buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name)); 2628 buf->ccontext.NameLength = cpu_to_le16(4); 2629 /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */ 2630 buf->Name[0] = 'S'; 2631 buf->Name[1] = 'e'; 2632 buf->Name[2] = 'c'; 2633 buf->Name[3] = 'D'; 2634 buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */ 2635 2636 /* 2637 * ACL is "self relative" ie ACL is stored in contiguous block of memory 2638 * and "DP" ie the DACL is present 2639 */ 2640 buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP); 2641 2642 /* offset owner, group and Sbz1 and SACL are all zero */ 2643 buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd); 2644 /* Ship the ACL for now. we will copy it into buf later. */ 2645 aclptr = ptr; 2646 ptr += sizeof(struct smb3_acl); 2647 2648 /* create one ACE to hold the mode embedded in reserved special SID */ 2649 acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode); 2650 ptr += acelen; 2651 acl_size = acelen + sizeof(struct smb3_acl); 2652 ace_count = 1; 2653 2654 if (set_owner) { 2655 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */ 2656 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr); 2657 ptr += acelen; 2658 acl_size += acelen; 2659 ace_count += 1; 2660 } 2661 2662 /* and one more ACE to allow access for authenticated users */ 2663 acelen = setup_authusers_ACE((struct cifs_ace *)ptr); 2664 ptr += acelen; 2665 acl_size += acelen; 2666 ace_count += 1; 2667 2668 acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */ 2669 acl.AclSize = cpu_to_le16(acl_size); 2670 acl.AceCount = cpu_to_le16(ace_count); 2671 /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */ 2672 memcpy(aclptr, &acl, sizeof(struct smb3_acl)); 2673 2674 buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd); 2675 *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8); 2676 2677 return buf; 2678 } 2679 2680 static int 2681 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner) 2682 { 2683 unsigned int num = *num_iovec; 2684 unsigned int len = 0; 2685 2686 iov[num].iov_base = create_sd_buf(mode, set_owner, &len); 2687 if (iov[num].iov_base == NULL) 2688 return -ENOMEM; 2689 iov[num].iov_len = len; 2690 *num_iovec = num + 1; 2691 return 0; 2692 } 2693 2694 static struct crt_query_id_ctxt * 2695 create_query_id_buf(void) 2696 { 2697 struct crt_query_id_ctxt *buf; 2698 2699 buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL); 2700 if (!buf) 2701 return NULL; 2702 2703 buf->ccontext.DataOffset = cpu_to_le16(0); 2704 buf->ccontext.DataLength = cpu_to_le32(0); 2705 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2706 (struct crt_query_id_ctxt, Name)); 2707 buf->ccontext.NameLength = cpu_to_le16(4); 2708 /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */ 2709 buf->Name[0] = 'Q'; 2710 buf->Name[1] = 'F'; 2711 buf->Name[2] = 'i'; 2712 buf->Name[3] = 'd'; 2713 return buf; 2714 } 2715 2716 /* See MS-SMB2 2.2.13.2.9 */ 2717 static int 2718 add_query_id_context(struct kvec *iov, unsigned int *num_iovec) 2719 { 2720 unsigned int num = *num_iovec; 2721 2722 iov[num].iov_base = create_query_id_buf(); 2723 if (iov[num].iov_base == NULL) 2724 return -ENOMEM; 2725 iov[num].iov_len = sizeof(struct crt_query_id_ctxt); 2726 *num_iovec = num + 1; 2727 return 0; 2728 } 2729 2730 static int 2731 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len, 2732 const char *treename, const __le16 *path) 2733 { 2734 int treename_len, path_len; 2735 struct nls_table *cp; 2736 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)}; 2737 2738 /* 2739 * skip leading "\\" 2740 */ 2741 treename_len = strlen(treename); 2742 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\')) 2743 return -EINVAL; 2744 2745 treename += 2; 2746 treename_len -= 2; 2747 2748 path_len = UniStrnlen((wchar_t *)path, PATH_MAX); 2749 2750 /* make room for one path separator only if @path isn't empty */ 2751 *out_len = treename_len + (path[0] ? 1 : 0) + path_len; 2752 2753 /* 2754 * final path needs to be 8-byte aligned as specified in 2755 * MS-SMB2 2.2.13 SMB2 CREATE Request. 2756 */ 2757 *out_size = round_up(*out_len * sizeof(__le16), 8); 2758 *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL); 2759 if (!*out_path) 2760 return -ENOMEM; 2761 2762 cp = load_nls_default(); 2763 cifs_strtoUTF16(*out_path, treename, treename_len, cp); 2764 2765 /* Do not append the separator if the path is empty */ 2766 if (path[0] != cpu_to_le16(0x0000)) { 2767 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep); 2768 UniStrcat((wchar_t *)*out_path, (wchar_t *)path); 2769 } 2770 2771 unload_nls(cp); 2772 2773 return 0; 2774 } 2775 2776 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode, 2777 umode_t mode, struct cifs_tcon *tcon, 2778 const char *full_path, 2779 struct cifs_sb_info *cifs_sb) 2780 { 2781 struct smb_rqst rqst; 2782 struct smb2_create_req *req; 2783 struct smb2_create_rsp *rsp = NULL; 2784 struct cifs_ses *ses = tcon->ses; 2785 struct kvec iov[3]; /* make sure at least one for each open context */ 2786 struct kvec rsp_iov = {NULL, 0}; 2787 int resp_buftype; 2788 int uni_path_len; 2789 __le16 *copy_path = NULL; 2790 int copy_size; 2791 int rc = 0; 2792 unsigned int n_iov = 2; 2793 __u32 file_attributes = 0; 2794 char *pc_buf = NULL; 2795 int flags = 0; 2796 unsigned int total_len; 2797 __le16 *utf16_path = NULL; 2798 struct TCP_Server_Info *server; 2799 int retries = 0, cur_sleep = 1; 2800 2801 replay_again: 2802 /* reinitialize for possible replay */ 2803 flags = 0; 2804 n_iov = 2; 2805 server = cifs_pick_channel(ses); 2806 2807 cifs_dbg(FYI, "mkdir\n"); 2808 2809 /* resource #1: path allocation */ 2810 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb); 2811 if (!utf16_path) 2812 return -ENOMEM; 2813 2814 if (!ses || !server) { 2815 rc = -EIO; 2816 goto err_free_path; 2817 } 2818 2819 /* resource #2: request */ 2820 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server, 2821 (void **) &req, &total_len); 2822 if (rc) 2823 goto err_free_path; 2824 2825 2826 if (smb3_encryption_required(tcon)) 2827 flags |= CIFS_TRANSFORM_REQ; 2828 2829 req->ImpersonationLevel = IL_IMPERSONATION; 2830 req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES); 2831 /* File attributes ignored on open (used in create though) */ 2832 req->FileAttributes = cpu_to_le32(file_attributes); 2833 req->ShareAccess = FILE_SHARE_ALL_LE; 2834 req->CreateDisposition = cpu_to_le32(FILE_CREATE); 2835 req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE); 2836 2837 iov[0].iov_base = (char *)req; 2838 /* -1 since last byte is buf[0] which is sent below (path) */ 2839 iov[0].iov_len = total_len - 1; 2840 2841 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); 2842 2843 /* [MS-SMB2] 2.2.13 NameOffset: 2844 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of 2845 * the SMB2 header, the file name includes a prefix that will 2846 * be processed during DFS name normalization as specified in 2847 * section 3.3.5.9. Otherwise, the file name is relative to 2848 * the share that is identified by the TreeId in the SMB2 2849 * header. 2850 */ 2851 if (tcon->share_flags & SHI1005_FLAGS_DFS) { 2852 int name_len; 2853 2854 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; 2855 rc = alloc_path_with_tree_prefix(©_path, ©_size, 2856 &name_len, 2857 tcon->tree_name, utf16_path); 2858 if (rc) 2859 goto err_free_req; 2860 2861 req->NameLength = cpu_to_le16(name_len * 2); 2862 uni_path_len = copy_size; 2863 /* free before overwriting resource */ 2864 kfree(utf16_path); 2865 utf16_path = copy_path; 2866 } else { 2867 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2; 2868 /* MUST set path len (NameLength) to 0 opening root of share */ 2869 req->NameLength = cpu_to_le16(uni_path_len - 2); 2870 if (uni_path_len % 8 != 0) { 2871 copy_size = roundup(uni_path_len, 8); 2872 copy_path = kzalloc(copy_size, GFP_KERNEL); 2873 if (!copy_path) { 2874 rc = -ENOMEM; 2875 goto err_free_req; 2876 } 2877 memcpy((char *)copy_path, (const char *)utf16_path, 2878 uni_path_len); 2879 uni_path_len = copy_size; 2880 /* free before overwriting resource */ 2881 kfree(utf16_path); 2882 utf16_path = copy_path; 2883 } 2884 } 2885 2886 iov[1].iov_len = uni_path_len; 2887 iov[1].iov_base = utf16_path; 2888 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE; 2889 2890 if (tcon->posix_extensions) { 2891 /* resource #3: posix buf */ 2892 rc = add_posix_context(iov, &n_iov, mode); 2893 if (rc) 2894 goto err_free_req; 2895 req->CreateContextsOffset = cpu_to_le32( 2896 sizeof(struct smb2_create_req) + 2897 iov[1].iov_len); 2898 pc_buf = iov[n_iov-1].iov_base; 2899 } 2900 2901 2902 memset(&rqst, 0, sizeof(struct smb_rqst)); 2903 rqst.rq_iov = iov; 2904 rqst.rq_nvec = n_iov; 2905 2906 /* no need to inc num_remote_opens because we close it just below */ 2907 trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE, 2908 FILE_WRITE_ATTRIBUTES); 2909 2910 if (retries) 2911 smb2_set_replay(server, &rqst); 2912 2913 /* resource #4: response buffer */ 2914 rc = cifs_send_recv(xid, ses, server, 2915 &rqst, &resp_buftype, flags, &rsp_iov); 2916 if (rc) { 2917 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); 2918 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid, 2919 CREATE_NOT_FILE, 2920 FILE_WRITE_ATTRIBUTES, rc); 2921 goto err_free_rsp_buf; 2922 } 2923 2924 /* 2925 * Although unlikely to be possible for rsp to be null and rc not set, 2926 * adding check below is slightly safer long term (and quiets Coverity 2927 * warning) 2928 */ 2929 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; 2930 if (rsp == NULL) { 2931 rc = -EIO; 2932 kfree(pc_buf); 2933 goto err_free_req; 2934 } 2935 2936 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid, 2937 CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES); 2938 2939 SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId); 2940 2941 /* Eventually save off posix specific response info and timestaps */ 2942 2943 err_free_rsp_buf: 2944 free_rsp_buf(resp_buftype, rsp); 2945 kfree(pc_buf); 2946 err_free_req: 2947 cifs_small_buf_release(req); 2948 err_free_path: 2949 kfree(utf16_path); 2950 2951 if (is_replayable_error(rc) && 2952 smb2_should_replay(tcon, &retries, &cur_sleep)) 2953 goto replay_again; 2954 2955 return rc; 2956 } 2957 2958 int 2959 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 2960 struct smb_rqst *rqst, __u8 *oplock, 2961 struct cifs_open_parms *oparms, __le16 *path) 2962 { 2963 struct smb2_create_req *req; 2964 unsigned int n_iov = 2; 2965 __u32 file_attributes = 0; 2966 int copy_size; 2967 int uni_path_len; 2968 unsigned int total_len; 2969 struct kvec *iov = rqst->rq_iov; 2970 __le16 *copy_path; 2971 int rc; 2972 2973 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server, 2974 (void **) &req, &total_len); 2975 if (rc) 2976 return rc; 2977 2978 iov[0].iov_base = (char *)req; 2979 /* -1 since last byte is buf[0] which is sent below (path) */ 2980 iov[0].iov_len = total_len - 1; 2981 2982 if (oparms->create_options & CREATE_OPTION_READONLY) 2983 file_attributes |= ATTR_READONLY; 2984 if (oparms->create_options & CREATE_OPTION_SPECIAL) 2985 file_attributes |= ATTR_SYSTEM; 2986 2987 req->ImpersonationLevel = IL_IMPERSONATION; 2988 req->DesiredAccess = cpu_to_le32(oparms->desired_access); 2989 /* File attributes ignored on open (used in create though) */ 2990 req->FileAttributes = cpu_to_le32(file_attributes); 2991 req->ShareAccess = FILE_SHARE_ALL_LE; 2992 2993 req->CreateDisposition = cpu_to_le32(oparms->disposition); 2994 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK); 2995 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); 2996 2997 /* [MS-SMB2] 2.2.13 NameOffset: 2998 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of 2999 * the SMB2 header, the file name includes a prefix that will 3000 * be processed during DFS name normalization as specified in 3001 * section 3.3.5.9. Otherwise, the file name is relative to 3002 * the share that is identified by the TreeId in the SMB2 3003 * header. 3004 */ 3005 if (tcon->share_flags & SHI1005_FLAGS_DFS) { 3006 int name_len; 3007 3008 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; 3009 rc = alloc_path_with_tree_prefix(©_path, ©_size, 3010 &name_len, 3011 tcon->tree_name, path); 3012 if (rc) 3013 return rc; 3014 req->NameLength = cpu_to_le16(name_len * 2); 3015 uni_path_len = copy_size; 3016 path = copy_path; 3017 } else { 3018 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2; 3019 /* MUST set path len (NameLength) to 0 opening root of share */ 3020 req->NameLength = cpu_to_le16(uni_path_len - 2); 3021 copy_size = round_up(uni_path_len, 8); 3022 copy_path = kzalloc(copy_size, GFP_KERNEL); 3023 if (!copy_path) 3024 return -ENOMEM; 3025 memcpy((char *)copy_path, (const char *)path, 3026 uni_path_len); 3027 uni_path_len = copy_size; 3028 path = copy_path; 3029 } 3030 3031 iov[1].iov_len = uni_path_len; 3032 iov[1].iov_base = path; 3033 3034 if ((!server->oplocks) || (tcon->no_lease)) 3035 *oplock = SMB2_OPLOCK_LEVEL_NONE; 3036 3037 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) || 3038 *oplock == SMB2_OPLOCK_LEVEL_NONE) 3039 req->RequestedOplockLevel = *oplock; 3040 else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) && 3041 (oparms->create_options & CREATE_NOT_FILE)) 3042 req->RequestedOplockLevel = *oplock; /* no srv lease support */ 3043 else { 3044 rc = add_lease_context(server, req, iov, &n_iov, 3045 oparms->fid->lease_key, oplock); 3046 if (rc) 3047 return rc; 3048 } 3049 3050 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) { 3051 rc = add_durable_context(iov, &n_iov, oparms, 3052 tcon->use_persistent); 3053 if (rc) 3054 return rc; 3055 } 3056 3057 if (tcon->posix_extensions) { 3058 rc = add_posix_context(iov, &n_iov, oparms->mode); 3059 if (rc) 3060 return rc; 3061 } 3062 3063 if (tcon->snapshot_time) { 3064 cifs_dbg(FYI, "adding snapshot context\n"); 3065 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time); 3066 if (rc) 3067 return rc; 3068 } 3069 3070 if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) { 3071 bool set_mode; 3072 bool set_owner; 3073 3074 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) && 3075 (oparms->mode != ACL_NO_MODE)) 3076 set_mode = true; 3077 else { 3078 set_mode = false; 3079 oparms->mode = ACL_NO_MODE; 3080 } 3081 3082 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL) 3083 set_owner = true; 3084 else 3085 set_owner = false; 3086 3087 if (set_owner | set_mode) { 3088 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode); 3089 rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner); 3090 if (rc) 3091 return rc; 3092 } 3093 } 3094 3095 add_query_id_context(iov, &n_iov); 3096 3097 if (n_iov > 2) { 3098 /* 3099 * We have create contexts behind iov[1] (the file 3100 * name), point at them from the main create request 3101 */ 3102 req->CreateContextsOffset = cpu_to_le32( 3103 sizeof(struct smb2_create_req) + 3104 iov[1].iov_len); 3105 req->CreateContextsLength = 0; 3106 3107 for (unsigned int i = 2; i < (n_iov-1); i++) { 3108 struct kvec *v = &iov[i]; 3109 size_t len = v->iov_len; 3110 struct create_context *cctx = 3111 (struct create_context *)v->iov_base; 3112 3113 cctx->Next = cpu_to_le32(len); 3114 le32_add_cpu(&req->CreateContextsLength, len); 3115 } 3116 le32_add_cpu(&req->CreateContextsLength, 3117 iov[n_iov-1].iov_len); 3118 } 3119 3120 rqst->rq_nvec = n_iov; 3121 return 0; 3122 } 3123 3124 /* rq_iov[0] is the request and is released by cifs_small_buf_release(). 3125 * All other vectors are freed by kfree(). 3126 */ 3127 void 3128 SMB2_open_free(struct smb_rqst *rqst) 3129 { 3130 int i; 3131 3132 if (rqst && rqst->rq_iov) { 3133 cifs_small_buf_release(rqst->rq_iov[0].iov_base); 3134 for (i = 1; i < rqst->rq_nvec; i++) 3135 if (rqst->rq_iov[i].iov_base != smb2_padding) 3136 kfree(rqst->rq_iov[i].iov_base); 3137 } 3138 } 3139 3140 int 3141 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path, 3142 __u8 *oplock, struct smb2_file_all_info *buf, 3143 struct create_posix_rsp *posix, 3144 struct kvec *err_iov, int *buftype) 3145 { 3146 struct smb_rqst rqst; 3147 struct smb2_create_rsp *rsp = NULL; 3148 struct cifs_tcon *tcon = oparms->tcon; 3149 struct cifs_ses *ses = tcon->ses; 3150 struct TCP_Server_Info *server; 3151 struct kvec iov[SMB2_CREATE_IOV_SIZE]; 3152 struct kvec rsp_iov = {NULL, 0}; 3153 int resp_buftype = CIFS_NO_BUFFER; 3154 int rc = 0; 3155 int flags = 0; 3156 int retries = 0, cur_sleep = 1; 3157 3158 replay_again: 3159 /* reinitialize for possible replay */ 3160 flags = 0; 3161 server = cifs_pick_channel(ses); 3162 3163 cifs_dbg(FYI, "create/open\n"); 3164 if (!ses || !server) 3165 return -EIO; 3166 3167 if (smb3_encryption_required(tcon)) 3168 flags |= CIFS_TRANSFORM_REQ; 3169 3170 memset(&rqst, 0, sizeof(struct smb_rqst)); 3171 memset(&iov, 0, sizeof(iov)); 3172 rqst.rq_iov = iov; 3173 rqst.rq_nvec = SMB2_CREATE_IOV_SIZE; 3174 3175 rc = SMB2_open_init(tcon, server, 3176 &rqst, oplock, oparms, path); 3177 if (rc) 3178 goto creat_exit; 3179 3180 trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path, 3181 oparms->create_options, oparms->desired_access); 3182 3183 if (retries) 3184 smb2_set_replay(server, &rqst); 3185 3186 rc = cifs_send_recv(xid, ses, server, 3187 &rqst, &resp_buftype, flags, 3188 &rsp_iov); 3189 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; 3190 3191 if (rc != 0) { 3192 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); 3193 if (err_iov && rsp) { 3194 *err_iov = rsp_iov; 3195 *buftype = resp_buftype; 3196 resp_buftype = CIFS_NO_BUFFER; 3197 rsp = NULL; 3198 } 3199 trace_smb3_open_err(xid, tcon->tid, ses->Suid, 3200 oparms->create_options, oparms->desired_access, rc); 3201 if (rc == -EREMCHG) { 3202 pr_warn_once("server share %s deleted\n", 3203 tcon->tree_name); 3204 tcon->need_reconnect = true; 3205 } 3206 goto creat_exit; 3207 } else if (rsp == NULL) /* unlikely to happen, but safer to check */ 3208 goto creat_exit; 3209 else 3210 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid, 3211 oparms->create_options, oparms->desired_access); 3212 3213 atomic_inc(&tcon->num_remote_opens); 3214 oparms->fid->persistent_fid = rsp->PersistentFileId; 3215 oparms->fid->volatile_fid = rsp->VolatileFileId; 3216 oparms->fid->access = oparms->desired_access; 3217 #ifdef CONFIG_CIFS_DEBUG2 3218 oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId); 3219 #endif /* CIFS_DEBUG2 */ 3220 3221 if (buf) { 3222 buf->CreationTime = rsp->CreationTime; 3223 buf->LastAccessTime = rsp->LastAccessTime; 3224 buf->LastWriteTime = rsp->LastWriteTime; 3225 buf->ChangeTime = rsp->ChangeTime; 3226 buf->AllocationSize = rsp->AllocationSize; 3227 buf->EndOfFile = rsp->EndofFile; 3228 buf->Attributes = rsp->FileAttributes; 3229 buf->NumberOfLinks = cpu_to_le32(1); 3230 buf->DeletePending = 0; 3231 } 3232 3233 3234 rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch, 3235 oparms->fid->lease_key, oplock, buf, posix); 3236 creat_exit: 3237 SMB2_open_free(&rqst); 3238 free_rsp_buf(resp_buftype, rsp); 3239 3240 if (is_replayable_error(rc) && 3241 smb2_should_replay(tcon, &retries, &cur_sleep)) 3242 goto replay_again; 3243 3244 return rc; 3245 } 3246 3247 int 3248 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3249 struct smb_rqst *rqst, 3250 u64 persistent_fid, u64 volatile_fid, u32 opcode, 3251 char *in_data, u32 indatalen, 3252 __u32 max_response_size) 3253 { 3254 struct smb2_ioctl_req *req; 3255 struct kvec *iov = rqst->rq_iov; 3256 unsigned int total_len; 3257 int rc; 3258 char *in_data_buf; 3259 3260 rc = smb2_ioctl_req_init(opcode, tcon, server, 3261 (void **) &req, &total_len); 3262 if (rc) 3263 return rc; 3264 3265 if (indatalen) { 3266 /* 3267 * indatalen is usually small at a couple of bytes max, so 3268 * just allocate through generic pool 3269 */ 3270 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS); 3271 if (!in_data_buf) { 3272 cifs_small_buf_release(req); 3273 return -ENOMEM; 3274 } 3275 } 3276 3277 req->CtlCode = cpu_to_le32(opcode); 3278 req->PersistentFileId = persistent_fid; 3279 req->VolatileFileId = volatile_fid; 3280 3281 iov[0].iov_base = (char *)req; 3282 /* 3283 * If no input data, the size of ioctl struct in 3284 * protocol spec still includes a 1 byte data buffer, 3285 * but if input data passed to ioctl, we do not 3286 * want to double count this, so we do not send 3287 * the dummy one byte of data in iovec[0] if sending 3288 * input data (in iovec[1]). 3289 */ 3290 if (indatalen) { 3291 req->InputCount = cpu_to_le32(indatalen); 3292 /* do not set InputOffset if no input data */ 3293 req->InputOffset = 3294 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer)); 3295 rqst->rq_nvec = 2; 3296 iov[0].iov_len = total_len - 1; 3297 iov[1].iov_base = in_data_buf; 3298 iov[1].iov_len = indatalen; 3299 } else { 3300 rqst->rq_nvec = 1; 3301 iov[0].iov_len = total_len; 3302 } 3303 3304 req->OutputOffset = 0; 3305 req->OutputCount = 0; /* MBZ */ 3306 3307 /* 3308 * In most cases max_response_size is set to 16K (CIFSMaxBufSize) 3309 * We Could increase default MaxOutputResponse, but that could require 3310 * more credits. Windows typically sets this smaller, but for some 3311 * ioctls it may be useful to allow server to send more. No point 3312 * limiting what the server can send as long as fits in one credit 3313 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want 3314 * to increase this limit up in the future. 3315 * Note that for snapshot queries that servers like Azure expect that 3316 * the first query be minimal size (and just used to get the number/size 3317 * of previous versions) so response size must be specified as EXACTLY 3318 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple 3319 * of eight bytes. Currently that is the only case where we set max 3320 * response size smaller. 3321 */ 3322 req->MaxOutputResponse = cpu_to_le32(max_response_size); 3323 req->hdr.CreditCharge = 3324 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size), 3325 SMB2_MAX_BUFFER_SIZE)); 3326 /* always an FSCTL (for now) */ 3327 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL); 3328 3329 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */ 3330 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) 3331 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 3332 3333 return 0; 3334 } 3335 3336 void 3337 SMB2_ioctl_free(struct smb_rqst *rqst) 3338 { 3339 int i; 3340 3341 if (rqst && rqst->rq_iov) { 3342 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3343 for (i = 1; i < rqst->rq_nvec; i++) 3344 if (rqst->rq_iov[i].iov_base != smb2_padding) 3345 kfree(rqst->rq_iov[i].iov_base); 3346 } 3347 } 3348 3349 3350 /* 3351 * SMB2 IOCTL is used for both IOCTLs and FSCTLs 3352 */ 3353 int 3354 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 3355 u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen, 3356 u32 max_out_data_len, char **out_data, 3357 u32 *plen /* returned data len */) 3358 { 3359 struct smb_rqst rqst; 3360 struct smb2_ioctl_rsp *rsp = NULL; 3361 struct cifs_ses *ses; 3362 struct TCP_Server_Info *server; 3363 struct kvec iov[SMB2_IOCTL_IOV_SIZE]; 3364 struct kvec rsp_iov = {NULL, 0}; 3365 int resp_buftype = CIFS_NO_BUFFER; 3366 int rc = 0; 3367 int flags = 0; 3368 int retries = 0, cur_sleep = 1; 3369 3370 if (!tcon) 3371 return -EIO; 3372 3373 ses = tcon->ses; 3374 if (!ses) 3375 return -EIO; 3376 3377 replay_again: 3378 /* reinitialize for possible replay */ 3379 flags = 0; 3380 server = cifs_pick_channel(ses); 3381 3382 if (!server) 3383 return -EIO; 3384 3385 cifs_dbg(FYI, "SMB2 IOCTL\n"); 3386 3387 if (out_data != NULL) 3388 *out_data = NULL; 3389 3390 /* zero out returned data len, in case of error */ 3391 if (plen) 3392 *plen = 0; 3393 3394 if (smb3_encryption_required(tcon)) 3395 flags |= CIFS_TRANSFORM_REQ; 3396 3397 memset(&rqst, 0, sizeof(struct smb_rqst)); 3398 memset(&iov, 0, sizeof(iov)); 3399 rqst.rq_iov = iov; 3400 rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE; 3401 3402 rc = SMB2_ioctl_init(tcon, server, 3403 &rqst, persistent_fid, volatile_fid, opcode, 3404 in_data, indatalen, max_out_data_len); 3405 if (rc) 3406 goto ioctl_exit; 3407 3408 if (retries) 3409 smb2_set_replay(server, &rqst); 3410 3411 rc = cifs_send_recv(xid, ses, server, 3412 &rqst, &resp_buftype, flags, 3413 &rsp_iov); 3414 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base; 3415 3416 if (rc != 0) 3417 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid, 3418 ses->Suid, 0, opcode, rc); 3419 3420 if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) { 3421 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3422 goto ioctl_exit; 3423 } else if (rc == -EINVAL) { 3424 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) && 3425 (opcode != FSCTL_SRV_COPYCHUNK)) { 3426 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3427 goto ioctl_exit; 3428 } 3429 } else if (rc == -E2BIG) { 3430 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) { 3431 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3432 goto ioctl_exit; 3433 } 3434 } 3435 3436 /* check if caller wants to look at return data or just return rc */ 3437 if ((plen == NULL) || (out_data == NULL)) 3438 goto ioctl_exit; 3439 3440 /* 3441 * Although unlikely to be possible for rsp to be null and rc not set, 3442 * adding check below is slightly safer long term (and quiets Coverity 3443 * warning) 3444 */ 3445 if (rsp == NULL) { 3446 rc = -EIO; 3447 goto ioctl_exit; 3448 } 3449 3450 *plen = le32_to_cpu(rsp->OutputCount); 3451 3452 /* We check for obvious errors in the output buffer length and offset */ 3453 if (*plen == 0) 3454 goto ioctl_exit; /* server returned no data */ 3455 else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) { 3456 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen); 3457 *plen = 0; 3458 rc = -EIO; 3459 goto ioctl_exit; 3460 } 3461 3462 if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) { 3463 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen, 3464 le32_to_cpu(rsp->OutputOffset)); 3465 *plen = 0; 3466 rc = -EIO; 3467 goto ioctl_exit; 3468 } 3469 3470 *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset), 3471 *plen, GFP_KERNEL); 3472 if (*out_data == NULL) { 3473 rc = -ENOMEM; 3474 goto ioctl_exit; 3475 } 3476 3477 ioctl_exit: 3478 SMB2_ioctl_free(&rqst); 3479 free_rsp_buf(resp_buftype, rsp); 3480 3481 if (is_replayable_error(rc) && 3482 smb2_should_replay(tcon, &retries, &cur_sleep)) 3483 goto replay_again; 3484 3485 return rc; 3486 } 3487 3488 /* 3489 * Individual callers to ioctl worker function follow 3490 */ 3491 3492 int 3493 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon, 3494 u64 persistent_fid, u64 volatile_fid) 3495 { 3496 int rc; 3497 struct compress_ioctl fsctl_input; 3498 char *ret_data = NULL; 3499 3500 fsctl_input.CompressionState = 3501 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT); 3502 3503 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid, 3504 FSCTL_SET_COMPRESSION, 3505 (char *)&fsctl_input /* data input */, 3506 2 /* in data len */, CIFSMaxBufSize /* max out data */, 3507 &ret_data /* out data */, NULL); 3508 3509 cifs_dbg(FYI, "set compression rc %d\n", rc); 3510 3511 return rc; 3512 } 3513 3514 int 3515 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3516 struct smb_rqst *rqst, 3517 u64 persistent_fid, u64 volatile_fid, bool query_attrs) 3518 { 3519 struct smb2_close_req *req; 3520 struct kvec *iov = rqst->rq_iov; 3521 unsigned int total_len; 3522 int rc; 3523 3524 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server, 3525 (void **) &req, &total_len); 3526 if (rc) 3527 return rc; 3528 3529 req->PersistentFileId = persistent_fid; 3530 req->VolatileFileId = volatile_fid; 3531 if (query_attrs) 3532 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB; 3533 else 3534 req->Flags = 0; 3535 iov[0].iov_base = (char *)req; 3536 iov[0].iov_len = total_len; 3537 3538 return 0; 3539 } 3540 3541 void 3542 SMB2_close_free(struct smb_rqst *rqst) 3543 { 3544 if (rqst && rqst->rq_iov) 3545 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3546 } 3547 3548 int 3549 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, 3550 u64 persistent_fid, u64 volatile_fid, 3551 struct smb2_file_network_open_info *pbuf) 3552 { 3553 struct smb_rqst rqst; 3554 struct smb2_close_rsp *rsp = NULL; 3555 struct cifs_ses *ses = tcon->ses; 3556 struct TCP_Server_Info *server; 3557 struct kvec iov[1]; 3558 struct kvec rsp_iov; 3559 int resp_buftype = CIFS_NO_BUFFER; 3560 int rc = 0; 3561 int flags = 0; 3562 bool query_attrs = false; 3563 int retries = 0, cur_sleep = 1; 3564 3565 replay_again: 3566 /* reinitialize for possible replay */ 3567 flags = 0; 3568 query_attrs = false; 3569 server = cifs_pick_channel(ses); 3570 3571 cifs_dbg(FYI, "Close\n"); 3572 3573 if (!ses || !server) 3574 return -EIO; 3575 3576 if (smb3_encryption_required(tcon)) 3577 flags |= CIFS_TRANSFORM_REQ; 3578 3579 memset(&rqst, 0, sizeof(struct smb_rqst)); 3580 memset(&iov, 0, sizeof(iov)); 3581 rqst.rq_iov = iov; 3582 rqst.rq_nvec = 1; 3583 3584 /* check if need to ask server to return timestamps in close response */ 3585 if (pbuf) 3586 query_attrs = true; 3587 3588 trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid); 3589 rc = SMB2_close_init(tcon, server, 3590 &rqst, persistent_fid, volatile_fid, 3591 query_attrs); 3592 if (rc) 3593 goto close_exit; 3594 3595 if (retries) 3596 smb2_set_replay(server, &rqst); 3597 3598 rc = cifs_send_recv(xid, ses, server, 3599 &rqst, &resp_buftype, flags, &rsp_iov); 3600 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base; 3601 3602 if (rc != 0) { 3603 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE); 3604 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid, 3605 rc); 3606 goto close_exit; 3607 } else { 3608 trace_smb3_close_done(xid, persistent_fid, tcon->tid, 3609 ses->Suid); 3610 if (pbuf) 3611 memcpy(&pbuf->network_open_info, 3612 &rsp->network_open_info, 3613 sizeof(pbuf->network_open_info)); 3614 atomic_dec(&tcon->num_remote_opens); 3615 } 3616 3617 close_exit: 3618 SMB2_close_free(&rqst); 3619 free_rsp_buf(resp_buftype, rsp); 3620 3621 /* retry close in a worker thread if this one is interrupted */ 3622 if (is_interrupt_error(rc)) { 3623 int tmp_rc; 3624 3625 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid, 3626 volatile_fid); 3627 if (tmp_rc) 3628 cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n", 3629 persistent_fid, tmp_rc); 3630 } 3631 3632 if (is_replayable_error(rc) && 3633 smb2_should_replay(tcon, &retries, &cur_sleep)) 3634 goto replay_again; 3635 3636 return rc; 3637 } 3638 3639 int 3640 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, 3641 u64 persistent_fid, u64 volatile_fid) 3642 { 3643 return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL); 3644 } 3645 3646 int 3647 smb2_validate_iov(unsigned int offset, unsigned int buffer_length, 3648 struct kvec *iov, unsigned int min_buf_size) 3649 { 3650 unsigned int smb_len = iov->iov_len; 3651 char *end_of_smb = smb_len + (char *)iov->iov_base; 3652 char *begin_of_buf = offset + (char *)iov->iov_base; 3653 char *end_of_buf = begin_of_buf + buffer_length; 3654 3655 3656 if (buffer_length < min_buf_size) { 3657 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n", 3658 buffer_length, min_buf_size); 3659 return -EINVAL; 3660 } 3661 3662 /* check if beyond RFC1001 maximum length */ 3663 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) { 3664 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n", 3665 buffer_length, smb_len); 3666 return -EINVAL; 3667 } 3668 3669 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) { 3670 cifs_dbg(VFS, "Invalid server response, bad offset to data\n"); 3671 return -EINVAL; 3672 } 3673 3674 return 0; 3675 } 3676 3677 /* 3678 * If SMB buffer fields are valid, copy into temporary buffer to hold result. 3679 * Caller must free buffer. 3680 */ 3681 int 3682 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length, 3683 struct kvec *iov, unsigned int minbufsize, 3684 char *data) 3685 { 3686 char *begin_of_buf = offset + (char *)iov->iov_base; 3687 int rc; 3688 3689 if (!data) 3690 return -EINVAL; 3691 3692 rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize); 3693 if (rc) 3694 return rc; 3695 3696 memcpy(data, begin_of_buf, minbufsize); 3697 3698 return 0; 3699 } 3700 3701 int 3702 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3703 struct smb_rqst *rqst, 3704 u64 persistent_fid, u64 volatile_fid, 3705 u8 info_class, u8 info_type, u32 additional_info, 3706 size_t output_len, size_t input_len, void *input) 3707 { 3708 struct smb2_query_info_req *req; 3709 struct kvec *iov = rqst->rq_iov; 3710 unsigned int total_len; 3711 size_t len; 3712 int rc; 3713 3714 if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) || 3715 len > CIFSMaxBufSize)) 3716 return -EINVAL; 3717 3718 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server, 3719 (void **) &req, &total_len); 3720 if (rc) 3721 return rc; 3722 3723 req->InfoType = info_type; 3724 req->FileInfoClass = info_class; 3725 req->PersistentFileId = persistent_fid; 3726 req->VolatileFileId = volatile_fid; 3727 req->AdditionalInformation = cpu_to_le32(additional_info); 3728 3729 req->OutputBufferLength = cpu_to_le32(output_len); 3730 if (input_len) { 3731 req->InputBufferLength = cpu_to_le32(input_len); 3732 /* total_len for smb query request never close to le16 max */ 3733 req->InputBufferOffset = cpu_to_le16(total_len - 1); 3734 memcpy(req->Buffer, input, input_len); 3735 } 3736 3737 iov[0].iov_base = (char *)req; 3738 /* 1 for Buffer */ 3739 iov[0].iov_len = len; 3740 return 0; 3741 } 3742 3743 void 3744 SMB2_query_info_free(struct smb_rqst *rqst) 3745 { 3746 if (rqst && rqst->rq_iov) 3747 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3748 } 3749 3750 static int 3751 query_info(const unsigned int xid, struct cifs_tcon *tcon, 3752 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type, 3753 u32 additional_info, size_t output_len, size_t min_len, void **data, 3754 u32 *dlen) 3755 { 3756 struct smb_rqst rqst; 3757 struct smb2_query_info_rsp *rsp = NULL; 3758 struct kvec iov[1]; 3759 struct kvec rsp_iov; 3760 int rc = 0; 3761 int resp_buftype = CIFS_NO_BUFFER; 3762 struct cifs_ses *ses = tcon->ses; 3763 struct TCP_Server_Info *server; 3764 int flags = 0; 3765 bool allocated = false; 3766 int retries = 0, cur_sleep = 1; 3767 3768 cifs_dbg(FYI, "Query Info\n"); 3769 3770 if (!ses) 3771 return -EIO; 3772 3773 replay_again: 3774 /* reinitialize for possible replay */ 3775 flags = 0; 3776 allocated = false; 3777 server = cifs_pick_channel(ses); 3778 3779 if (!server) 3780 return -EIO; 3781 3782 if (smb3_encryption_required(tcon)) 3783 flags |= CIFS_TRANSFORM_REQ; 3784 3785 memset(&rqst, 0, sizeof(struct smb_rqst)); 3786 memset(&iov, 0, sizeof(iov)); 3787 rqst.rq_iov = iov; 3788 rqst.rq_nvec = 1; 3789 3790 rc = SMB2_query_info_init(tcon, server, 3791 &rqst, persistent_fid, volatile_fid, 3792 info_class, info_type, additional_info, 3793 output_len, 0, NULL); 3794 if (rc) 3795 goto qinf_exit; 3796 3797 trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid, 3798 ses->Suid, info_class, (__u32)info_type); 3799 3800 if (retries) 3801 smb2_set_replay(server, &rqst); 3802 3803 rc = cifs_send_recv(xid, ses, server, 3804 &rqst, &resp_buftype, flags, &rsp_iov); 3805 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 3806 3807 if (rc) { 3808 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 3809 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid, 3810 ses->Suid, info_class, (__u32)info_type, rc); 3811 goto qinf_exit; 3812 } 3813 3814 trace_smb3_query_info_done(xid, persistent_fid, tcon->tid, 3815 ses->Suid, info_class, (__u32)info_type); 3816 3817 if (dlen) { 3818 *dlen = le32_to_cpu(rsp->OutputBufferLength); 3819 if (!*data) { 3820 *data = kmalloc(*dlen, GFP_KERNEL); 3821 if (!*data) { 3822 cifs_tcon_dbg(VFS, 3823 "Error %d allocating memory for acl\n", 3824 rc); 3825 *dlen = 0; 3826 rc = -ENOMEM; 3827 goto qinf_exit; 3828 } 3829 allocated = true; 3830 } 3831 } 3832 3833 rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset), 3834 le32_to_cpu(rsp->OutputBufferLength), 3835 &rsp_iov, dlen ? *dlen : min_len, *data); 3836 if (rc && allocated) { 3837 kfree(*data); 3838 *data = NULL; 3839 *dlen = 0; 3840 } 3841 3842 qinf_exit: 3843 SMB2_query_info_free(&rqst); 3844 free_rsp_buf(resp_buftype, rsp); 3845 3846 if (is_replayable_error(rc) && 3847 smb2_should_replay(tcon, &retries, &cur_sleep)) 3848 goto replay_again; 3849 3850 return rc; 3851 } 3852 3853 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon, 3854 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data) 3855 { 3856 return query_info(xid, tcon, persistent_fid, volatile_fid, 3857 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0, 3858 sizeof(struct smb2_file_all_info) + PATH_MAX * 2, 3859 sizeof(struct smb2_file_all_info), (void **)&data, 3860 NULL); 3861 } 3862 3863 #if 0 3864 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */ 3865 int 3866 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon, 3867 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen) 3868 { 3869 size_t output_len = sizeof(struct smb311_posix_qinfo *) + 3870 (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2); 3871 *plen = 0; 3872 3873 return query_info(xid, tcon, persistent_fid, volatile_fid, 3874 SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0, 3875 output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen); 3876 /* Note caller must free "data" (passed in above). It may be allocated in query_info call */ 3877 } 3878 #endif 3879 3880 int 3881 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon, 3882 u64 persistent_fid, u64 volatile_fid, 3883 void **data, u32 *plen, u32 extra_info) 3884 { 3885 __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO | 3886 extra_info; 3887 *plen = 0; 3888 3889 return query_info(xid, tcon, persistent_fid, volatile_fid, 3890 0, SMB2_O_INFO_SECURITY, additional_info, 3891 SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen); 3892 } 3893 3894 int 3895 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon, 3896 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid) 3897 { 3898 return query_info(xid, tcon, persistent_fid, volatile_fid, 3899 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0, 3900 sizeof(struct smb2_file_internal_info), 3901 sizeof(struct smb2_file_internal_info), 3902 (void **)&uniqueid, NULL); 3903 } 3904 3905 /* 3906 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory 3907 * See MS-SMB2 2.2.35 and 2.2.36 3908 */ 3909 3910 static int 3911 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst, 3912 struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3913 u64 persistent_fid, u64 volatile_fid, 3914 u32 completion_filter, bool watch_tree) 3915 { 3916 struct smb2_change_notify_req *req; 3917 struct kvec *iov = rqst->rq_iov; 3918 unsigned int total_len; 3919 int rc; 3920 3921 rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server, 3922 (void **) &req, &total_len); 3923 if (rc) 3924 return rc; 3925 3926 req->PersistentFileId = persistent_fid; 3927 req->VolatileFileId = volatile_fid; 3928 /* See note 354 of MS-SMB2, 64K max */ 3929 req->OutputBufferLength = 3930 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE); 3931 req->CompletionFilter = cpu_to_le32(completion_filter); 3932 if (watch_tree) 3933 req->Flags = cpu_to_le16(SMB2_WATCH_TREE); 3934 else 3935 req->Flags = 0; 3936 3937 iov[0].iov_base = (char *)req; 3938 iov[0].iov_len = total_len; 3939 3940 return 0; 3941 } 3942 3943 int 3944 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon, 3945 u64 persistent_fid, u64 volatile_fid, bool watch_tree, 3946 u32 completion_filter, u32 max_out_data_len, char **out_data, 3947 u32 *plen /* returned data len */) 3948 { 3949 struct cifs_ses *ses = tcon->ses; 3950 struct TCP_Server_Info *server; 3951 struct smb_rqst rqst; 3952 struct smb2_change_notify_rsp *smb_rsp; 3953 struct kvec iov[1]; 3954 struct kvec rsp_iov = {NULL, 0}; 3955 int resp_buftype = CIFS_NO_BUFFER; 3956 int flags = 0; 3957 int rc = 0; 3958 int retries = 0, cur_sleep = 1; 3959 3960 replay_again: 3961 /* reinitialize for possible replay */ 3962 flags = 0; 3963 server = cifs_pick_channel(ses); 3964 3965 cifs_dbg(FYI, "change notify\n"); 3966 if (!ses || !server) 3967 return -EIO; 3968 3969 if (smb3_encryption_required(tcon)) 3970 flags |= CIFS_TRANSFORM_REQ; 3971 3972 memset(&rqst, 0, sizeof(struct smb_rqst)); 3973 memset(&iov, 0, sizeof(iov)); 3974 if (plen) 3975 *plen = 0; 3976 3977 rqst.rq_iov = iov; 3978 rqst.rq_nvec = 1; 3979 3980 rc = SMB2_notify_init(xid, &rqst, tcon, server, 3981 persistent_fid, volatile_fid, 3982 completion_filter, watch_tree); 3983 if (rc) 3984 goto cnotify_exit; 3985 3986 trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid, 3987 (u8)watch_tree, completion_filter); 3988 3989 if (retries) 3990 smb2_set_replay(server, &rqst); 3991 3992 rc = cifs_send_recv(xid, ses, server, 3993 &rqst, &resp_buftype, flags, &rsp_iov); 3994 3995 if (rc != 0) { 3996 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE); 3997 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid, 3998 (u8)watch_tree, completion_filter, rc); 3999 } else { 4000 trace_smb3_notify_done(xid, persistent_fid, tcon->tid, 4001 ses->Suid, (u8)watch_tree, completion_filter); 4002 /* validate that notify information is plausible */ 4003 if ((rsp_iov.iov_base == NULL) || 4004 (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1)) 4005 goto cnotify_exit; 4006 4007 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base; 4008 4009 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset), 4010 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov, 4011 sizeof(struct file_notify_information)); 4012 4013 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset), 4014 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL); 4015 if (*out_data == NULL) { 4016 rc = -ENOMEM; 4017 goto cnotify_exit; 4018 } else if (plen) 4019 *plen = le32_to_cpu(smb_rsp->OutputBufferLength); 4020 } 4021 4022 cnotify_exit: 4023 if (rqst.rq_iov) 4024 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */ 4025 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4026 4027 if (is_replayable_error(rc) && 4028 smb2_should_replay(tcon, &retries, &cur_sleep)) 4029 goto replay_again; 4030 4031 return rc; 4032 } 4033 4034 4035 4036 /* 4037 * This is a no-op for now. We're not really interested in the reply, but 4038 * rather in the fact that the server sent one and that server->lstrp 4039 * gets updated. 4040 * 4041 * FIXME: maybe we should consider checking that the reply matches request? 4042 */ 4043 static void 4044 smb2_echo_callback(struct mid_q_entry *mid) 4045 { 4046 struct TCP_Server_Info *server = mid->callback_data; 4047 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf; 4048 struct cifs_credits credits = { .value = 0, .instance = 0 }; 4049 4050 if (mid->mid_state == MID_RESPONSE_RECEIVED 4051 || mid->mid_state == MID_RESPONSE_MALFORMED) { 4052 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 4053 credits.instance = server->reconnect_instance; 4054 } 4055 4056 release_mid(mid); 4057 add_credits(server, &credits, CIFS_ECHO_OP); 4058 } 4059 4060 void smb2_reconnect_server(struct work_struct *work) 4061 { 4062 struct TCP_Server_Info *server = container_of(work, 4063 struct TCP_Server_Info, reconnect.work); 4064 struct TCP_Server_Info *pserver; 4065 struct cifs_ses *ses, *ses2; 4066 struct cifs_tcon *tcon, *tcon2; 4067 struct list_head tmp_list, tmp_ses_list; 4068 bool ses_exist = false; 4069 bool tcon_selected = false; 4070 int rc; 4071 bool resched = false; 4072 4073 /* first check if ref count has reached 0, if not inc ref count */ 4074 spin_lock(&cifs_tcp_ses_lock); 4075 if (!server->srv_count) { 4076 spin_unlock(&cifs_tcp_ses_lock); 4077 return; 4078 } 4079 server->srv_count++; 4080 spin_unlock(&cifs_tcp_ses_lock); 4081 4082 /* If server is a channel, select the primary channel */ 4083 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 4084 4085 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */ 4086 mutex_lock(&pserver->reconnect_mutex); 4087 4088 /* if the server is marked for termination, drop the ref count here */ 4089 if (server->terminate) { 4090 cifs_put_tcp_session(server, true); 4091 mutex_unlock(&pserver->reconnect_mutex); 4092 return; 4093 } 4094 4095 INIT_LIST_HEAD(&tmp_list); 4096 INIT_LIST_HEAD(&tmp_ses_list); 4097 cifs_dbg(FYI, "Reconnecting tcons and channels\n"); 4098 4099 spin_lock(&cifs_tcp_ses_lock); 4100 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { 4101 spin_lock(&ses->ses_lock); 4102 if (ses->ses_status == SES_EXITING) { 4103 spin_unlock(&ses->ses_lock); 4104 continue; 4105 } 4106 spin_unlock(&ses->ses_lock); 4107 4108 tcon_selected = false; 4109 4110 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { 4111 if (tcon->need_reconnect || tcon->need_reopen_files) { 4112 tcon->tc_count++; 4113 list_add_tail(&tcon->rlist, &tmp_list); 4114 tcon_selected = true; 4115 } 4116 } 4117 /* 4118 * IPC has the same lifetime as its session and uses its 4119 * refcount. 4120 */ 4121 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) { 4122 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list); 4123 tcon_selected = true; 4124 cifs_smb_ses_inc_refcount(ses); 4125 } 4126 /* 4127 * handle the case where channel needs to reconnect 4128 * binding session, but tcon is healthy (some other channel 4129 * is active) 4130 */ 4131 spin_lock(&ses->chan_lock); 4132 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) { 4133 list_add_tail(&ses->rlist, &tmp_ses_list); 4134 ses_exist = true; 4135 cifs_smb_ses_inc_refcount(ses); 4136 } 4137 spin_unlock(&ses->chan_lock); 4138 } 4139 spin_unlock(&cifs_tcp_ses_lock); 4140 4141 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) { 4142 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true); 4143 if (!rc) 4144 cifs_reopen_persistent_handles(tcon); 4145 else 4146 resched = true; 4147 list_del_init(&tcon->rlist); 4148 if (tcon->ipc) 4149 cifs_put_smb_ses(tcon->ses); 4150 else 4151 cifs_put_tcon(tcon); 4152 } 4153 4154 if (!ses_exist) 4155 goto done; 4156 4157 /* allocate a dummy tcon struct used for reconnect */ 4158 tcon = tcon_info_alloc(false); 4159 if (!tcon) { 4160 resched = true; 4161 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) { 4162 list_del_init(&ses->rlist); 4163 cifs_put_smb_ses(ses); 4164 } 4165 goto done; 4166 } 4167 4168 tcon->status = TID_GOOD; 4169 tcon->retry = false; 4170 tcon->need_reconnect = false; 4171 4172 /* now reconnect sessions for necessary channels */ 4173 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) { 4174 tcon->ses = ses; 4175 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true); 4176 if (rc) 4177 resched = true; 4178 list_del_init(&ses->rlist); 4179 cifs_put_smb_ses(ses); 4180 } 4181 tconInfoFree(tcon); 4182 4183 done: 4184 cifs_dbg(FYI, "Reconnecting tcons and channels finished\n"); 4185 if (resched) 4186 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ); 4187 mutex_unlock(&pserver->reconnect_mutex); 4188 4189 /* now we can safely release srv struct */ 4190 cifs_put_tcp_session(server, true); 4191 } 4192 4193 int 4194 SMB2_echo(struct TCP_Server_Info *server) 4195 { 4196 struct smb2_echo_req *req; 4197 int rc = 0; 4198 struct kvec iov[1]; 4199 struct smb_rqst rqst = { .rq_iov = iov, 4200 .rq_nvec = 1 }; 4201 unsigned int total_len; 4202 4203 cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id); 4204 4205 spin_lock(&server->srv_lock); 4206 if (server->ops->need_neg && 4207 server->ops->need_neg(server)) { 4208 spin_unlock(&server->srv_lock); 4209 /* No need to send echo on newly established connections */ 4210 mod_delayed_work(cifsiod_wq, &server->reconnect, 0); 4211 return rc; 4212 } 4213 spin_unlock(&server->srv_lock); 4214 4215 rc = smb2_plain_req_init(SMB2_ECHO, NULL, server, 4216 (void **)&req, &total_len); 4217 if (rc) 4218 return rc; 4219 4220 req->hdr.CreditRequest = cpu_to_le16(1); 4221 4222 iov[0].iov_len = total_len; 4223 iov[0].iov_base = (char *)req; 4224 4225 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL, 4226 server, CIFS_ECHO_OP, NULL); 4227 if (rc) 4228 cifs_dbg(FYI, "Echo request failed: %d\n", rc); 4229 4230 cifs_small_buf_release(req); 4231 return rc; 4232 } 4233 4234 void 4235 SMB2_flush_free(struct smb_rqst *rqst) 4236 { 4237 if (rqst && rqst->rq_iov) 4238 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 4239 } 4240 4241 int 4242 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst, 4243 struct cifs_tcon *tcon, struct TCP_Server_Info *server, 4244 u64 persistent_fid, u64 volatile_fid) 4245 { 4246 struct smb2_flush_req *req; 4247 struct kvec *iov = rqst->rq_iov; 4248 unsigned int total_len; 4249 int rc; 4250 4251 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server, 4252 (void **) &req, &total_len); 4253 if (rc) 4254 return rc; 4255 4256 req->PersistentFileId = persistent_fid; 4257 req->VolatileFileId = volatile_fid; 4258 4259 iov[0].iov_base = (char *)req; 4260 iov[0].iov_len = total_len; 4261 4262 return 0; 4263 } 4264 4265 int 4266 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 4267 u64 volatile_fid) 4268 { 4269 struct cifs_ses *ses = tcon->ses; 4270 struct smb_rqst rqst; 4271 struct kvec iov[1]; 4272 struct kvec rsp_iov = {NULL, 0}; 4273 struct TCP_Server_Info *server; 4274 int resp_buftype = CIFS_NO_BUFFER; 4275 int flags = 0; 4276 int rc = 0; 4277 int retries = 0, cur_sleep = 1; 4278 4279 replay_again: 4280 /* reinitialize for possible replay */ 4281 flags = 0; 4282 server = cifs_pick_channel(ses); 4283 4284 cifs_dbg(FYI, "flush\n"); 4285 if (!ses || !(ses->server)) 4286 return -EIO; 4287 4288 if (smb3_encryption_required(tcon)) 4289 flags |= CIFS_TRANSFORM_REQ; 4290 4291 memset(&rqst, 0, sizeof(struct smb_rqst)); 4292 memset(&iov, 0, sizeof(iov)); 4293 rqst.rq_iov = iov; 4294 rqst.rq_nvec = 1; 4295 4296 rc = SMB2_flush_init(xid, &rqst, tcon, server, 4297 persistent_fid, volatile_fid); 4298 if (rc) 4299 goto flush_exit; 4300 4301 trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid); 4302 4303 if (retries) 4304 smb2_set_replay(server, &rqst); 4305 4306 rc = cifs_send_recv(xid, ses, server, 4307 &rqst, &resp_buftype, flags, &rsp_iov); 4308 4309 if (rc != 0) { 4310 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE); 4311 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid, 4312 rc); 4313 } else 4314 trace_smb3_flush_done(xid, persistent_fid, tcon->tid, 4315 ses->Suid); 4316 4317 flush_exit: 4318 SMB2_flush_free(&rqst); 4319 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4320 4321 if (is_replayable_error(rc) && 4322 smb2_should_replay(tcon, &retries, &cur_sleep)) 4323 goto replay_again; 4324 4325 return rc; 4326 } 4327 4328 #ifdef CONFIG_CIFS_SMB_DIRECT 4329 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms) 4330 { 4331 struct TCP_Server_Info *server = io_parms->server; 4332 struct cifs_tcon *tcon = io_parms->tcon; 4333 4334 /* we can only offload if we're connected */ 4335 if (!server || !tcon) 4336 return false; 4337 4338 /* we can only offload on an rdma connection */ 4339 if (!server->rdma || !server->smbd_conn) 4340 return false; 4341 4342 /* we don't support signed offload yet */ 4343 if (server->sign) 4344 return false; 4345 4346 /* we don't support encrypted offload yet */ 4347 if (smb3_encryption_required(tcon)) 4348 return false; 4349 4350 /* offload also has its overhead, so only do it if desired */ 4351 if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold) 4352 return false; 4353 4354 return true; 4355 } 4356 #endif /* CONFIG_CIFS_SMB_DIRECT */ 4357 4358 /* 4359 * To form a chain of read requests, any read requests after the first should 4360 * have the end_of_chain boolean set to true. 4361 */ 4362 static int 4363 smb2_new_read_req(void **buf, unsigned int *total_len, 4364 struct cifs_io_parms *io_parms, struct cifs_readdata *rdata, 4365 unsigned int remaining_bytes, int request_type) 4366 { 4367 int rc = -EACCES; 4368 struct smb2_read_req *req = NULL; 4369 struct smb2_hdr *shdr; 4370 struct TCP_Server_Info *server = io_parms->server; 4371 4372 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server, 4373 (void **) &req, total_len); 4374 if (rc) 4375 return rc; 4376 4377 if (server == NULL) 4378 return -ECONNABORTED; 4379 4380 shdr = &req->hdr; 4381 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 4382 4383 req->PersistentFileId = io_parms->persistent_fid; 4384 req->VolatileFileId = io_parms->volatile_fid; 4385 req->ReadChannelInfoOffset = 0; /* reserved */ 4386 req->ReadChannelInfoLength = 0; /* reserved */ 4387 req->Channel = 0; /* reserved */ 4388 req->MinimumCount = 0; 4389 req->Length = cpu_to_le32(io_parms->length); 4390 req->Offset = cpu_to_le64(io_parms->offset); 4391 4392 trace_smb3_read_enter(0 /* xid */, 4393 io_parms->persistent_fid, 4394 io_parms->tcon->tid, io_parms->tcon->ses->Suid, 4395 io_parms->offset, io_parms->length); 4396 #ifdef CONFIG_CIFS_SMB_DIRECT 4397 /* 4398 * If we want to do a RDMA write, fill in and append 4399 * smbd_buffer_descriptor_v1 to the end of read request 4400 */ 4401 if (smb3_use_rdma_offload(io_parms)) { 4402 struct smbd_buffer_descriptor_v1 *v1; 4403 bool need_invalidate = server->dialect == SMB30_PROT_ID; 4404 4405 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->iter, 4406 true, need_invalidate); 4407 if (!rdata->mr) 4408 return -EAGAIN; 4409 4410 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE; 4411 if (need_invalidate) 4412 req->Channel = SMB2_CHANNEL_RDMA_V1; 4413 req->ReadChannelInfoOffset = 4414 cpu_to_le16(offsetof(struct smb2_read_req, Buffer)); 4415 req->ReadChannelInfoLength = 4416 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1)); 4417 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0]; 4418 v1->offset = cpu_to_le64(rdata->mr->mr->iova); 4419 v1->token = cpu_to_le32(rdata->mr->mr->rkey); 4420 v1->length = cpu_to_le32(rdata->mr->mr->length); 4421 4422 *total_len += sizeof(*v1) - 1; 4423 } 4424 #endif 4425 if (request_type & CHAINED_REQUEST) { 4426 if (!(request_type & END_OF_CHAIN)) { 4427 /* next 8-byte aligned request */ 4428 *total_len = ALIGN(*total_len, 8); 4429 shdr->NextCommand = cpu_to_le32(*total_len); 4430 } else /* END_OF_CHAIN */ 4431 shdr->NextCommand = 0; 4432 if (request_type & RELATED_REQUEST) { 4433 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS; 4434 /* 4435 * Related requests use info from previous read request 4436 * in chain. 4437 */ 4438 shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF); 4439 shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF); 4440 req->PersistentFileId = (u64)-1; 4441 req->VolatileFileId = (u64)-1; 4442 } 4443 } 4444 if (remaining_bytes > io_parms->length) 4445 req->RemainingBytes = cpu_to_le32(remaining_bytes); 4446 else 4447 req->RemainingBytes = 0; 4448 4449 *buf = req; 4450 return rc; 4451 } 4452 4453 static void 4454 smb2_readv_callback(struct mid_q_entry *mid) 4455 { 4456 struct cifs_readdata *rdata = mid->callback_data; 4457 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); 4458 struct TCP_Server_Info *server = rdata->server; 4459 struct smb2_hdr *shdr = 4460 (struct smb2_hdr *)rdata->iov[0].iov_base; 4461 struct cifs_credits credits = { .value = 0, .instance = 0 }; 4462 struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 }; 4463 4464 if (rdata->got_bytes) { 4465 rqst.rq_iter = rdata->iter; 4466 rqst.rq_iter_size = iov_iter_count(&rdata->iter); 4467 } 4468 4469 WARN_ONCE(rdata->server != mid->server, 4470 "rdata server %p != mid server %p", 4471 rdata->server, mid->server); 4472 4473 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n", 4474 __func__, mid->mid, mid->mid_state, rdata->result, 4475 rdata->bytes); 4476 4477 switch (mid->mid_state) { 4478 case MID_RESPONSE_RECEIVED: 4479 credits.value = le16_to_cpu(shdr->CreditRequest); 4480 credits.instance = server->reconnect_instance; 4481 /* result already set, check signature */ 4482 if (server->sign && !mid->decrypted) { 4483 int rc; 4484 4485 iov_iter_revert(&rqst.rq_iter, rdata->got_bytes); 4486 iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes); 4487 rc = smb2_verify_signature(&rqst, server); 4488 if (rc) 4489 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n", 4490 rc); 4491 } 4492 /* FIXME: should this be counted toward the initiating task? */ 4493 task_io_account_read(rdata->got_bytes); 4494 cifs_stats_bytes_read(tcon, rdata->got_bytes); 4495 break; 4496 case MID_REQUEST_SUBMITTED: 4497 case MID_RETRY_NEEDED: 4498 rdata->result = -EAGAIN; 4499 if (server->sign && rdata->got_bytes) 4500 /* reset bytes number since we can not check a sign */ 4501 rdata->got_bytes = 0; 4502 /* FIXME: should this be counted toward the initiating task? */ 4503 task_io_account_read(rdata->got_bytes); 4504 cifs_stats_bytes_read(tcon, rdata->got_bytes); 4505 break; 4506 case MID_RESPONSE_MALFORMED: 4507 credits.value = le16_to_cpu(shdr->CreditRequest); 4508 credits.instance = server->reconnect_instance; 4509 fallthrough; 4510 default: 4511 rdata->result = -EIO; 4512 } 4513 #ifdef CONFIG_CIFS_SMB_DIRECT 4514 /* 4515 * If this rdata has a memmory registered, the MR can be freed 4516 * MR needs to be freed as soon as I/O finishes to prevent deadlock 4517 * because they have limited number and are used for future I/Os 4518 */ 4519 if (rdata->mr) { 4520 smbd_deregister_mr(rdata->mr); 4521 rdata->mr = NULL; 4522 } 4523 #endif 4524 if (rdata->result && rdata->result != -ENODATA) { 4525 cifs_stats_fail_inc(tcon, SMB2_READ_HE); 4526 trace_smb3_read_err(0 /* xid */, 4527 rdata->cfile->fid.persistent_fid, 4528 tcon->tid, tcon->ses->Suid, rdata->offset, 4529 rdata->bytes, rdata->result); 4530 } else 4531 trace_smb3_read_done(0 /* xid */, 4532 rdata->cfile->fid.persistent_fid, 4533 tcon->tid, tcon->ses->Suid, 4534 rdata->offset, rdata->got_bytes); 4535 4536 queue_work(cifsiod_wq, &rdata->work); 4537 release_mid(mid); 4538 add_credits(server, &credits, 0); 4539 } 4540 4541 /* smb2_async_readv - send an async read, and set up mid to handle result */ 4542 int 4543 smb2_async_readv(struct cifs_readdata *rdata) 4544 { 4545 int rc, flags = 0; 4546 char *buf; 4547 struct smb2_hdr *shdr; 4548 struct cifs_io_parms io_parms; 4549 struct smb_rqst rqst = { .rq_iov = rdata->iov, 4550 .rq_nvec = 1 }; 4551 struct TCP_Server_Info *server; 4552 struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); 4553 unsigned int total_len; 4554 int credit_request; 4555 4556 cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n", 4557 __func__, rdata->offset, rdata->bytes); 4558 4559 if (!rdata->server) 4560 rdata->server = cifs_pick_channel(tcon->ses); 4561 4562 io_parms.tcon = tlink_tcon(rdata->cfile->tlink); 4563 io_parms.server = server = rdata->server; 4564 io_parms.offset = rdata->offset; 4565 io_parms.length = rdata->bytes; 4566 io_parms.persistent_fid = rdata->cfile->fid.persistent_fid; 4567 io_parms.volatile_fid = rdata->cfile->fid.volatile_fid; 4568 io_parms.pid = rdata->pid; 4569 4570 rc = smb2_new_read_req( 4571 (void **) &buf, &total_len, &io_parms, rdata, 0, 0); 4572 if (rc) 4573 return rc; 4574 4575 if (smb3_encryption_required(io_parms.tcon)) 4576 flags |= CIFS_TRANSFORM_REQ; 4577 4578 rdata->iov[0].iov_base = buf; 4579 rdata->iov[0].iov_len = total_len; 4580 4581 shdr = (struct smb2_hdr *)buf; 4582 4583 if (rdata->credits.value > 0) { 4584 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes, 4585 SMB2_MAX_BUFFER_SIZE)); 4586 credit_request = le16_to_cpu(shdr->CreditCharge) + 8; 4587 if (server->credits >= server->max_credits) 4588 shdr->CreditRequest = cpu_to_le16(0); 4589 else 4590 shdr->CreditRequest = cpu_to_le16( 4591 min_t(int, server->max_credits - 4592 server->credits, credit_request)); 4593 4594 rc = adjust_credits(server, &rdata->credits, rdata->bytes); 4595 if (rc) 4596 goto async_readv_out; 4597 4598 flags |= CIFS_HAS_CREDITS; 4599 } 4600 4601 kref_get(&rdata->refcount); 4602 rc = cifs_call_async(server, &rqst, 4603 cifs_readv_receive, smb2_readv_callback, 4604 smb3_handle_read_data, rdata, flags, 4605 &rdata->credits); 4606 if (rc) { 4607 kref_put(&rdata->refcount, cifs_readdata_release); 4608 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE); 4609 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid, 4610 io_parms.tcon->tid, 4611 io_parms.tcon->ses->Suid, 4612 io_parms.offset, io_parms.length, rc); 4613 } 4614 4615 async_readv_out: 4616 cifs_small_buf_release(buf); 4617 return rc; 4618 } 4619 4620 int 4621 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms, 4622 unsigned int *nbytes, char **buf, int *buf_type) 4623 { 4624 struct smb_rqst rqst; 4625 int resp_buftype, rc; 4626 struct smb2_read_req *req = NULL; 4627 struct smb2_read_rsp *rsp = NULL; 4628 struct kvec iov[1]; 4629 struct kvec rsp_iov; 4630 unsigned int total_len; 4631 int flags = CIFS_LOG_ERROR; 4632 struct cifs_ses *ses = io_parms->tcon->ses; 4633 4634 if (!io_parms->server) 4635 io_parms->server = cifs_pick_channel(io_parms->tcon->ses); 4636 4637 *nbytes = 0; 4638 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0); 4639 if (rc) 4640 return rc; 4641 4642 if (smb3_encryption_required(io_parms->tcon)) 4643 flags |= CIFS_TRANSFORM_REQ; 4644 4645 iov[0].iov_base = (char *)req; 4646 iov[0].iov_len = total_len; 4647 4648 memset(&rqst, 0, sizeof(struct smb_rqst)); 4649 rqst.rq_iov = iov; 4650 rqst.rq_nvec = 1; 4651 4652 rc = cifs_send_recv(xid, ses, io_parms->server, 4653 &rqst, &resp_buftype, flags, &rsp_iov); 4654 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base; 4655 4656 if (rc) { 4657 if (rc != -ENODATA) { 4658 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE); 4659 cifs_dbg(VFS, "Send error in read = %d\n", rc); 4660 trace_smb3_read_err(xid, 4661 req->PersistentFileId, 4662 io_parms->tcon->tid, ses->Suid, 4663 io_parms->offset, io_parms->length, 4664 rc); 4665 } else 4666 trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid, 4667 ses->Suid, io_parms->offset, 0); 4668 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4669 cifs_small_buf_release(req); 4670 return rc == -ENODATA ? 0 : rc; 4671 } else 4672 trace_smb3_read_done(xid, 4673 req->PersistentFileId, 4674 io_parms->tcon->tid, ses->Suid, 4675 io_parms->offset, io_parms->length); 4676 4677 cifs_small_buf_release(req); 4678 4679 *nbytes = le32_to_cpu(rsp->DataLength); 4680 if ((*nbytes > CIFS_MAX_MSGSIZE) || 4681 (*nbytes > io_parms->length)) { 4682 cifs_dbg(FYI, "bad length %d for count %d\n", 4683 *nbytes, io_parms->length); 4684 rc = -EIO; 4685 *nbytes = 0; 4686 } 4687 4688 if (*buf) { 4689 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes); 4690 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4691 } else if (resp_buftype != CIFS_NO_BUFFER) { 4692 *buf = rsp_iov.iov_base; 4693 if (resp_buftype == CIFS_SMALL_BUFFER) 4694 *buf_type = CIFS_SMALL_BUFFER; 4695 else if (resp_buftype == CIFS_LARGE_BUFFER) 4696 *buf_type = CIFS_LARGE_BUFFER; 4697 } 4698 return rc; 4699 } 4700 4701 /* 4702 * Check the mid_state and signature on received buffer (if any), and queue the 4703 * workqueue completion task. 4704 */ 4705 static void 4706 smb2_writev_callback(struct mid_q_entry *mid) 4707 { 4708 struct cifs_writedata *wdata = mid->callback_data; 4709 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); 4710 struct TCP_Server_Info *server = wdata->server; 4711 unsigned int written; 4712 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; 4713 struct cifs_credits credits = { .value = 0, .instance = 0 }; 4714 4715 WARN_ONCE(wdata->server != mid->server, 4716 "wdata server %p != mid server %p", 4717 wdata->server, mid->server); 4718 4719 switch (mid->mid_state) { 4720 case MID_RESPONSE_RECEIVED: 4721 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 4722 credits.instance = server->reconnect_instance; 4723 wdata->result = smb2_check_receive(mid, server, 0); 4724 if (wdata->result != 0) 4725 break; 4726 4727 written = le32_to_cpu(rsp->DataLength); 4728 /* 4729 * Mask off high 16 bits when bytes written as returned 4730 * by the server is greater than bytes requested by the 4731 * client. OS/2 servers are known to set incorrect 4732 * CountHigh values. 4733 */ 4734 if (written > wdata->bytes) 4735 written &= 0xFFFF; 4736 4737 if (written < wdata->bytes) 4738 wdata->result = -ENOSPC; 4739 else 4740 wdata->bytes = written; 4741 break; 4742 case MID_REQUEST_SUBMITTED: 4743 case MID_RETRY_NEEDED: 4744 wdata->result = -EAGAIN; 4745 break; 4746 case MID_RESPONSE_MALFORMED: 4747 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 4748 credits.instance = server->reconnect_instance; 4749 fallthrough; 4750 default: 4751 wdata->result = -EIO; 4752 break; 4753 } 4754 #ifdef CONFIG_CIFS_SMB_DIRECT 4755 /* 4756 * If this wdata has a memory registered, the MR can be freed 4757 * The number of MRs available is limited, it's important to recover 4758 * used MR as soon as I/O is finished. Hold MR longer in the later 4759 * I/O process can possibly result in I/O deadlock due to lack of MR 4760 * to send request on I/O retry 4761 */ 4762 if (wdata->mr) { 4763 smbd_deregister_mr(wdata->mr); 4764 wdata->mr = NULL; 4765 } 4766 #endif 4767 if (wdata->result) { 4768 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); 4769 trace_smb3_write_err(0 /* no xid */, 4770 wdata->cfile->fid.persistent_fid, 4771 tcon->tid, tcon->ses->Suid, wdata->offset, 4772 wdata->bytes, wdata->result); 4773 if (wdata->result == -ENOSPC) 4774 pr_warn_once("Out of space writing to %s\n", 4775 tcon->tree_name); 4776 } else 4777 trace_smb3_write_done(0 /* no xid */, 4778 wdata->cfile->fid.persistent_fid, 4779 tcon->tid, tcon->ses->Suid, 4780 wdata->offset, wdata->bytes); 4781 4782 queue_work(cifsiod_wq, &wdata->work); 4783 release_mid(mid); 4784 add_credits(server, &credits, 0); 4785 } 4786 4787 /* smb2_async_writev - send an async write, and set up mid to handle result */ 4788 int 4789 smb2_async_writev(struct cifs_writedata *wdata, 4790 void (*release)(struct kref *kref)) 4791 { 4792 int rc = -EACCES, flags = 0; 4793 struct smb2_write_req *req = NULL; 4794 struct smb2_hdr *shdr; 4795 struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); 4796 struct TCP_Server_Info *server = wdata->server; 4797 struct kvec iov[1]; 4798 struct smb_rqst rqst = { }; 4799 unsigned int total_len; 4800 struct cifs_io_parms _io_parms; 4801 struct cifs_io_parms *io_parms = NULL; 4802 int credit_request; 4803 4804 if (!wdata->server || wdata->replay) 4805 server = wdata->server = cifs_pick_channel(tcon->ses); 4806 4807 /* 4808 * in future we may get cifs_io_parms passed in from the caller, 4809 * but for now we construct it here... 4810 */ 4811 _io_parms = (struct cifs_io_parms) { 4812 .tcon = tcon, 4813 .server = server, 4814 .offset = wdata->offset, 4815 .length = wdata->bytes, 4816 .persistent_fid = wdata->cfile->fid.persistent_fid, 4817 .volatile_fid = wdata->cfile->fid.volatile_fid, 4818 .pid = wdata->pid, 4819 }; 4820 io_parms = &_io_parms; 4821 4822 rc = smb2_plain_req_init(SMB2_WRITE, tcon, server, 4823 (void **) &req, &total_len); 4824 if (rc) 4825 return rc; 4826 4827 if (smb3_encryption_required(tcon)) 4828 flags |= CIFS_TRANSFORM_REQ; 4829 4830 shdr = (struct smb2_hdr *)req; 4831 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 4832 4833 req->PersistentFileId = io_parms->persistent_fid; 4834 req->VolatileFileId = io_parms->volatile_fid; 4835 req->WriteChannelInfoOffset = 0; 4836 req->WriteChannelInfoLength = 0; 4837 req->Channel = SMB2_CHANNEL_NONE; 4838 req->Offset = cpu_to_le64(io_parms->offset); 4839 req->DataOffset = cpu_to_le16( 4840 offsetof(struct smb2_write_req, Buffer)); 4841 req->RemainingBytes = 0; 4842 4843 trace_smb3_write_enter(0 /* xid */, 4844 io_parms->persistent_fid, 4845 io_parms->tcon->tid, 4846 io_parms->tcon->ses->Suid, 4847 io_parms->offset, 4848 io_parms->length); 4849 4850 #ifdef CONFIG_CIFS_SMB_DIRECT 4851 /* 4852 * If we want to do a server RDMA read, fill in and append 4853 * smbd_buffer_descriptor_v1 to the end of write request 4854 */ 4855 if (smb3_use_rdma_offload(io_parms)) { 4856 struct smbd_buffer_descriptor_v1 *v1; 4857 size_t data_size = iov_iter_count(&wdata->iter); 4858 bool need_invalidate = server->dialect == SMB30_PROT_ID; 4859 4860 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->iter, 4861 false, need_invalidate); 4862 if (!wdata->mr) { 4863 rc = -EAGAIN; 4864 goto async_writev_out; 4865 } 4866 req->Length = 0; 4867 req->DataOffset = 0; 4868 req->RemainingBytes = cpu_to_le32(data_size); 4869 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE; 4870 if (need_invalidate) 4871 req->Channel = SMB2_CHANNEL_RDMA_V1; 4872 req->WriteChannelInfoOffset = 4873 cpu_to_le16(offsetof(struct smb2_write_req, Buffer)); 4874 req->WriteChannelInfoLength = 4875 cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1)); 4876 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0]; 4877 v1->offset = cpu_to_le64(wdata->mr->mr->iova); 4878 v1->token = cpu_to_le32(wdata->mr->mr->rkey); 4879 v1->length = cpu_to_le32(wdata->mr->mr->length); 4880 } 4881 #endif 4882 iov[0].iov_len = total_len - 1; 4883 iov[0].iov_base = (char *)req; 4884 4885 rqst.rq_iov = iov; 4886 rqst.rq_nvec = 1; 4887 rqst.rq_iter = wdata->iter; 4888 rqst.rq_iter_size = iov_iter_count(&rqst.rq_iter); 4889 if (wdata->replay) 4890 smb2_set_replay(server, &rqst); 4891 #ifdef CONFIG_CIFS_SMB_DIRECT 4892 if (wdata->mr) 4893 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1); 4894 #endif 4895 cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n", 4896 io_parms->offset, io_parms->length, iov_iter_count(&rqst.rq_iter)); 4897 4898 #ifdef CONFIG_CIFS_SMB_DIRECT 4899 /* For RDMA read, I/O size is in RemainingBytes not in Length */ 4900 if (!wdata->mr) 4901 req->Length = cpu_to_le32(io_parms->length); 4902 #else 4903 req->Length = cpu_to_le32(io_parms->length); 4904 #endif 4905 4906 if (wdata->credits.value > 0) { 4907 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes, 4908 SMB2_MAX_BUFFER_SIZE)); 4909 credit_request = le16_to_cpu(shdr->CreditCharge) + 8; 4910 if (server->credits >= server->max_credits) 4911 shdr->CreditRequest = cpu_to_le16(0); 4912 else 4913 shdr->CreditRequest = cpu_to_le16( 4914 min_t(int, server->max_credits - 4915 server->credits, credit_request)); 4916 4917 rc = adjust_credits(server, &wdata->credits, io_parms->length); 4918 if (rc) 4919 goto async_writev_out; 4920 4921 flags |= CIFS_HAS_CREDITS; 4922 } 4923 4924 kref_get(&wdata->refcount); 4925 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL, 4926 wdata, flags, &wdata->credits); 4927 4928 if (rc) { 4929 trace_smb3_write_err(0 /* no xid */, 4930 io_parms->persistent_fid, 4931 io_parms->tcon->tid, 4932 io_parms->tcon->ses->Suid, 4933 io_parms->offset, 4934 io_parms->length, 4935 rc); 4936 kref_put(&wdata->refcount, release); 4937 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); 4938 } 4939 4940 async_writev_out: 4941 cifs_small_buf_release(req); 4942 return rc; 4943 } 4944 4945 /* 4946 * SMB2_write function gets iov pointer to kvec array with n_vec as a length. 4947 * The length field from io_parms must be at least 1 and indicates a number of 4948 * elements with data to write that begins with position 1 in iov array. All 4949 * data length is specified by count. 4950 */ 4951 int 4952 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms, 4953 unsigned int *nbytes, struct kvec *iov, int n_vec) 4954 { 4955 struct smb_rqst rqst; 4956 int rc = 0; 4957 struct smb2_write_req *req = NULL; 4958 struct smb2_write_rsp *rsp = NULL; 4959 int resp_buftype; 4960 struct kvec rsp_iov; 4961 int flags = 0; 4962 unsigned int total_len; 4963 struct TCP_Server_Info *server; 4964 int retries = 0, cur_sleep = 1; 4965 4966 replay_again: 4967 /* reinitialize for possible replay */ 4968 flags = 0; 4969 *nbytes = 0; 4970 if (!io_parms->server) 4971 io_parms->server = cifs_pick_channel(io_parms->tcon->ses); 4972 server = io_parms->server; 4973 if (server == NULL) 4974 return -ECONNABORTED; 4975 4976 if (n_vec < 1) 4977 return rc; 4978 4979 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server, 4980 (void **) &req, &total_len); 4981 if (rc) 4982 return rc; 4983 4984 if (smb3_encryption_required(io_parms->tcon)) 4985 flags |= CIFS_TRANSFORM_REQ; 4986 4987 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 4988 4989 req->PersistentFileId = io_parms->persistent_fid; 4990 req->VolatileFileId = io_parms->volatile_fid; 4991 req->WriteChannelInfoOffset = 0; 4992 req->WriteChannelInfoLength = 0; 4993 req->Channel = 0; 4994 req->Length = cpu_to_le32(io_parms->length); 4995 req->Offset = cpu_to_le64(io_parms->offset); 4996 req->DataOffset = cpu_to_le16( 4997 offsetof(struct smb2_write_req, Buffer)); 4998 req->RemainingBytes = 0; 4999 5000 trace_smb3_write_enter(xid, io_parms->persistent_fid, 5001 io_parms->tcon->tid, io_parms->tcon->ses->Suid, 5002 io_parms->offset, io_parms->length); 5003 5004 iov[0].iov_base = (char *)req; 5005 /* 1 for Buffer */ 5006 iov[0].iov_len = total_len - 1; 5007 5008 memset(&rqst, 0, sizeof(struct smb_rqst)); 5009 rqst.rq_iov = iov; 5010 rqst.rq_nvec = n_vec + 1; 5011 5012 if (retries) 5013 smb2_set_replay(server, &rqst); 5014 5015 rc = cifs_send_recv(xid, io_parms->tcon->ses, server, 5016 &rqst, 5017 &resp_buftype, flags, &rsp_iov); 5018 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base; 5019 5020 if (rc) { 5021 trace_smb3_write_err(xid, 5022 req->PersistentFileId, 5023 io_parms->tcon->tid, 5024 io_parms->tcon->ses->Suid, 5025 io_parms->offset, io_parms->length, rc); 5026 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE); 5027 cifs_dbg(VFS, "Send error in write = %d\n", rc); 5028 } else { 5029 *nbytes = le32_to_cpu(rsp->DataLength); 5030 trace_smb3_write_done(xid, 5031 req->PersistentFileId, 5032 io_parms->tcon->tid, 5033 io_parms->tcon->ses->Suid, 5034 io_parms->offset, *nbytes); 5035 } 5036 5037 cifs_small_buf_release(req); 5038 free_rsp_buf(resp_buftype, rsp); 5039 5040 if (is_replayable_error(rc) && 5041 smb2_should_replay(io_parms->tcon, &retries, &cur_sleep)) 5042 goto replay_again; 5043 5044 return rc; 5045 } 5046 5047 int posix_info_sid_size(const void *beg, const void *end) 5048 { 5049 size_t subauth; 5050 int total; 5051 5052 if (beg + 1 > end) 5053 return -1; 5054 5055 subauth = *(u8 *)(beg+1); 5056 if (subauth < 1 || subauth > 15) 5057 return -1; 5058 5059 total = 1 + 1 + 6 + 4*subauth; 5060 if (beg + total > end) 5061 return -1; 5062 5063 return total; 5064 } 5065 5066 int posix_info_parse(const void *beg, const void *end, 5067 struct smb2_posix_info_parsed *out) 5068 5069 { 5070 int total_len = 0; 5071 int owner_len, group_len; 5072 int name_len; 5073 const void *owner_sid; 5074 const void *group_sid; 5075 const void *name; 5076 5077 /* if no end bound given, assume payload to be correct */ 5078 if (!end) { 5079 const struct smb2_posix_info *p = beg; 5080 5081 end = beg + le32_to_cpu(p->NextEntryOffset); 5082 /* last element will have a 0 offset, pick a sensible bound */ 5083 if (end == beg) 5084 end += 0xFFFF; 5085 } 5086 5087 /* check base buf */ 5088 if (beg + sizeof(struct smb2_posix_info) > end) 5089 return -1; 5090 total_len = sizeof(struct smb2_posix_info); 5091 5092 /* check owner sid */ 5093 owner_sid = beg + total_len; 5094 owner_len = posix_info_sid_size(owner_sid, end); 5095 if (owner_len < 0) 5096 return -1; 5097 total_len += owner_len; 5098 5099 /* check group sid */ 5100 group_sid = beg + total_len; 5101 group_len = posix_info_sid_size(group_sid, end); 5102 if (group_len < 0) 5103 return -1; 5104 total_len += group_len; 5105 5106 /* check name len */ 5107 if (beg + total_len + 4 > end) 5108 return -1; 5109 name_len = le32_to_cpu(*(__le32 *)(beg + total_len)); 5110 if (name_len < 1 || name_len > 0xFFFF) 5111 return -1; 5112 total_len += 4; 5113 5114 /* check name */ 5115 name = beg + total_len; 5116 if (name + name_len > end) 5117 return -1; 5118 total_len += name_len; 5119 5120 if (out) { 5121 out->base = beg; 5122 out->size = total_len; 5123 out->name_len = name_len; 5124 out->name = name; 5125 memcpy(&out->owner, owner_sid, owner_len); 5126 memcpy(&out->group, group_sid, group_len); 5127 } 5128 return total_len; 5129 } 5130 5131 static int posix_info_extra_size(const void *beg, const void *end) 5132 { 5133 int len = posix_info_parse(beg, end, NULL); 5134 5135 if (len < 0) 5136 return -1; 5137 return len - sizeof(struct smb2_posix_info); 5138 } 5139 5140 static unsigned int 5141 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry, 5142 size_t size) 5143 { 5144 int len; 5145 unsigned int entrycount = 0; 5146 unsigned int next_offset = 0; 5147 char *entryptr; 5148 FILE_DIRECTORY_INFO *dir_info; 5149 5150 if (bufstart == NULL) 5151 return 0; 5152 5153 entryptr = bufstart; 5154 5155 while (1) { 5156 if (entryptr + next_offset < entryptr || 5157 entryptr + next_offset > end_of_buf || 5158 entryptr + next_offset + size > end_of_buf) { 5159 cifs_dbg(VFS, "malformed search entry would overflow\n"); 5160 break; 5161 } 5162 5163 entryptr = entryptr + next_offset; 5164 dir_info = (FILE_DIRECTORY_INFO *)entryptr; 5165 5166 if (infotype == SMB_FIND_FILE_POSIX_INFO) 5167 len = posix_info_extra_size(entryptr, end_of_buf); 5168 else 5169 len = le32_to_cpu(dir_info->FileNameLength); 5170 5171 if (len < 0 || 5172 entryptr + len < entryptr || 5173 entryptr + len > end_of_buf || 5174 entryptr + len + size > end_of_buf) { 5175 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n", 5176 end_of_buf); 5177 break; 5178 } 5179 5180 *lastentry = entryptr; 5181 entrycount++; 5182 5183 next_offset = le32_to_cpu(dir_info->NextEntryOffset); 5184 if (!next_offset) 5185 break; 5186 } 5187 5188 return entrycount; 5189 } 5190 5191 /* 5192 * Readdir/FindFirst 5193 */ 5194 int SMB2_query_directory_init(const unsigned int xid, 5195 struct cifs_tcon *tcon, 5196 struct TCP_Server_Info *server, 5197 struct smb_rqst *rqst, 5198 u64 persistent_fid, u64 volatile_fid, 5199 int index, int info_level) 5200 { 5201 struct smb2_query_directory_req *req; 5202 unsigned char *bufptr; 5203 __le16 asteriks = cpu_to_le16('*'); 5204 unsigned int output_size = CIFSMaxBufSize - 5205 MAX_SMB2_CREATE_RESPONSE_SIZE - 5206 MAX_SMB2_CLOSE_RESPONSE_SIZE; 5207 unsigned int total_len; 5208 struct kvec *iov = rqst->rq_iov; 5209 int len, rc; 5210 5211 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server, 5212 (void **) &req, &total_len); 5213 if (rc) 5214 return rc; 5215 5216 switch (info_level) { 5217 case SMB_FIND_FILE_DIRECTORY_INFO: 5218 req->FileInformationClass = FILE_DIRECTORY_INFORMATION; 5219 break; 5220 case SMB_FIND_FILE_ID_FULL_DIR_INFO: 5221 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION; 5222 break; 5223 case SMB_FIND_FILE_POSIX_INFO: 5224 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO; 5225 break; 5226 case SMB_FIND_FILE_FULL_DIRECTORY_INFO: 5227 req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION; 5228 break; 5229 default: 5230 cifs_tcon_dbg(VFS, "info level %u isn't supported\n", 5231 info_level); 5232 return -EINVAL; 5233 } 5234 5235 req->FileIndex = cpu_to_le32(index); 5236 req->PersistentFileId = persistent_fid; 5237 req->VolatileFileId = volatile_fid; 5238 5239 len = 0x2; 5240 bufptr = req->Buffer; 5241 memcpy(bufptr, &asteriks, len); 5242 5243 req->FileNameOffset = 5244 cpu_to_le16(sizeof(struct smb2_query_directory_req)); 5245 req->FileNameLength = cpu_to_le16(len); 5246 /* 5247 * BB could be 30 bytes or so longer if we used SMB2 specific 5248 * buffer lengths, but this is safe and close enough. 5249 */ 5250 output_size = min_t(unsigned int, output_size, server->maxBuf); 5251 output_size = min_t(unsigned int, output_size, 2 << 15); 5252 req->OutputBufferLength = cpu_to_le32(output_size); 5253 5254 iov[0].iov_base = (char *)req; 5255 /* 1 for Buffer */ 5256 iov[0].iov_len = total_len - 1; 5257 5258 iov[1].iov_base = (char *)(req->Buffer); 5259 iov[1].iov_len = len; 5260 5261 trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid, 5262 tcon->ses->Suid, index, output_size); 5263 5264 return 0; 5265 } 5266 5267 void SMB2_query_directory_free(struct smb_rqst *rqst) 5268 { 5269 if (rqst && rqst->rq_iov) { 5270 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 5271 } 5272 } 5273 5274 int 5275 smb2_parse_query_directory(struct cifs_tcon *tcon, 5276 struct kvec *rsp_iov, 5277 int resp_buftype, 5278 struct cifs_search_info *srch_inf) 5279 { 5280 struct smb2_query_directory_rsp *rsp; 5281 size_t info_buf_size; 5282 char *end_of_smb; 5283 int rc; 5284 5285 rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base; 5286 5287 switch (srch_inf->info_level) { 5288 case SMB_FIND_FILE_DIRECTORY_INFO: 5289 info_buf_size = sizeof(FILE_DIRECTORY_INFO); 5290 break; 5291 case SMB_FIND_FILE_ID_FULL_DIR_INFO: 5292 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO); 5293 break; 5294 case SMB_FIND_FILE_POSIX_INFO: 5295 /* note that posix payload are variable size */ 5296 info_buf_size = sizeof(struct smb2_posix_info); 5297 break; 5298 case SMB_FIND_FILE_FULL_DIRECTORY_INFO: 5299 info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO); 5300 break; 5301 default: 5302 cifs_tcon_dbg(VFS, "info level %u isn't supported\n", 5303 srch_inf->info_level); 5304 return -EINVAL; 5305 } 5306 5307 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 5308 le32_to_cpu(rsp->OutputBufferLength), rsp_iov, 5309 info_buf_size); 5310 if (rc) { 5311 cifs_tcon_dbg(VFS, "bad info payload"); 5312 return rc; 5313 } 5314 5315 srch_inf->unicode = true; 5316 5317 if (srch_inf->ntwrk_buf_start) { 5318 if (srch_inf->smallBuf) 5319 cifs_small_buf_release(srch_inf->ntwrk_buf_start); 5320 else 5321 cifs_buf_release(srch_inf->ntwrk_buf_start); 5322 } 5323 srch_inf->ntwrk_buf_start = (char *)rsp; 5324 srch_inf->srch_entries_start = srch_inf->last_entry = 5325 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset); 5326 end_of_smb = rsp_iov->iov_len + (char *)rsp; 5327 5328 srch_inf->entries_in_buffer = num_entries( 5329 srch_inf->info_level, 5330 srch_inf->srch_entries_start, 5331 end_of_smb, 5332 &srch_inf->last_entry, 5333 info_buf_size); 5334 5335 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer; 5336 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n", 5337 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry, 5338 srch_inf->srch_entries_start, srch_inf->last_entry); 5339 if (resp_buftype == CIFS_LARGE_BUFFER) 5340 srch_inf->smallBuf = false; 5341 else if (resp_buftype == CIFS_SMALL_BUFFER) 5342 srch_inf->smallBuf = true; 5343 else 5344 cifs_tcon_dbg(VFS, "Invalid search buffer type\n"); 5345 5346 return 0; 5347 } 5348 5349 int 5350 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, 5351 u64 persistent_fid, u64 volatile_fid, int index, 5352 struct cifs_search_info *srch_inf) 5353 { 5354 struct smb_rqst rqst; 5355 struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE]; 5356 struct smb2_query_directory_rsp *rsp = NULL; 5357 int resp_buftype = CIFS_NO_BUFFER; 5358 struct kvec rsp_iov; 5359 int rc = 0; 5360 struct cifs_ses *ses = tcon->ses; 5361 struct TCP_Server_Info *server; 5362 int flags = 0; 5363 int retries = 0, cur_sleep = 1; 5364 5365 replay_again: 5366 /* reinitialize for possible replay */ 5367 flags = 0; 5368 server = cifs_pick_channel(ses); 5369 5370 if (!ses || !(ses->server)) 5371 return -EIO; 5372 5373 if (smb3_encryption_required(tcon)) 5374 flags |= CIFS_TRANSFORM_REQ; 5375 5376 memset(&rqst, 0, sizeof(struct smb_rqst)); 5377 memset(&iov, 0, sizeof(iov)); 5378 rqst.rq_iov = iov; 5379 rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE; 5380 5381 rc = SMB2_query_directory_init(xid, tcon, server, 5382 &rqst, persistent_fid, 5383 volatile_fid, index, 5384 srch_inf->info_level); 5385 if (rc) 5386 goto qdir_exit; 5387 5388 if (retries) 5389 smb2_set_replay(server, &rqst); 5390 5391 rc = cifs_send_recv(xid, ses, server, 5392 &rqst, &resp_buftype, flags, &rsp_iov); 5393 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base; 5394 5395 if (rc) { 5396 if (rc == -ENODATA && 5397 rsp->hdr.Status == STATUS_NO_MORE_FILES) { 5398 trace_smb3_query_dir_done(xid, persistent_fid, 5399 tcon->tid, tcon->ses->Suid, index, 0); 5400 srch_inf->endOfSearch = true; 5401 rc = 0; 5402 } else { 5403 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid, 5404 tcon->ses->Suid, index, 0, rc); 5405 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE); 5406 } 5407 goto qdir_exit; 5408 } 5409 5410 rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype, 5411 srch_inf); 5412 if (rc) { 5413 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid, 5414 tcon->ses->Suid, index, 0, rc); 5415 goto qdir_exit; 5416 } 5417 resp_buftype = CIFS_NO_BUFFER; 5418 5419 trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid, 5420 tcon->ses->Suid, index, srch_inf->entries_in_buffer); 5421 5422 qdir_exit: 5423 SMB2_query_directory_free(&rqst); 5424 free_rsp_buf(resp_buftype, rsp); 5425 5426 if (is_replayable_error(rc) && 5427 smb2_should_replay(tcon, &retries, &cur_sleep)) 5428 goto replay_again; 5429 5430 return rc; 5431 } 5432 5433 int 5434 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 5435 struct smb_rqst *rqst, 5436 u64 persistent_fid, u64 volatile_fid, u32 pid, 5437 u8 info_class, u8 info_type, u32 additional_info, 5438 void **data, unsigned int *size) 5439 { 5440 struct smb2_set_info_req *req; 5441 struct kvec *iov = rqst->rq_iov; 5442 unsigned int i, total_len; 5443 int rc; 5444 5445 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server, 5446 (void **) &req, &total_len); 5447 if (rc) 5448 return rc; 5449 5450 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid); 5451 req->InfoType = info_type; 5452 req->FileInfoClass = info_class; 5453 req->PersistentFileId = persistent_fid; 5454 req->VolatileFileId = volatile_fid; 5455 req->AdditionalInformation = cpu_to_le32(additional_info); 5456 5457 req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req)); 5458 req->BufferLength = cpu_to_le32(*size); 5459 5460 memcpy(req->Buffer, *data, *size); 5461 total_len += *size; 5462 5463 iov[0].iov_base = (char *)req; 5464 /* 1 for Buffer */ 5465 iov[0].iov_len = total_len - 1; 5466 5467 for (i = 1; i < rqst->rq_nvec; i++) { 5468 le32_add_cpu(&req->BufferLength, size[i]); 5469 iov[i].iov_base = (char *)data[i]; 5470 iov[i].iov_len = size[i]; 5471 } 5472 5473 return 0; 5474 } 5475 5476 void 5477 SMB2_set_info_free(struct smb_rqst *rqst) 5478 { 5479 if (rqst && rqst->rq_iov) 5480 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */ 5481 } 5482 5483 static int 5484 send_set_info(const unsigned int xid, struct cifs_tcon *tcon, 5485 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class, 5486 u8 info_type, u32 additional_info, unsigned int num, 5487 void **data, unsigned int *size) 5488 { 5489 struct smb_rqst rqst; 5490 struct smb2_set_info_rsp *rsp = NULL; 5491 struct kvec *iov; 5492 struct kvec rsp_iov; 5493 int rc = 0; 5494 int resp_buftype; 5495 struct cifs_ses *ses = tcon->ses; 5496 struct TCP_Server_Info *server; 5497 int flags = 0; 5498 int retries = 0, cur_sleep = 1; 5499 5500 replay_again: 5501 /* reinitialize for possible replay */ 5502 flags = 0; 5503 server = cifs_pick_channel(ses); 5504 5505 if (!ses || !server) 5506 return -EIO; 5507 5508 if (!num) 5509 return -EINVAL; 5510 5511 if (smb3_encryption_required(tcon)) 5512 flags |= CIFS_TRANSFORM_REQ; 5513 5514 iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL); 5515 if (!iov) 5516 return -ENOMEM; 5517 5518 memset(&rqst, 0, sizeof(struct smb_rqst)); 5519 rqst.rq_iov = iov; 5520 rqst.rq_nvec = num; 5521 5522 rc = SMB2_set_info_init(tcon, server, 5523 &rqst, persistent_fid, volatile_fid, pid, 5524 info_class, info_type, additional_info, 5525 data, size); 5526 if (rc) { 5527 kfree(iov); 5528 return rc; 5529 } 5530 5531 if (retries) 5532 smb2_set_replay(server, &rqst); 5533 5534 rc = cifs_send_recv(xid, ses, server, 5535 &rqst, &resp_buftype, flags, 5536 &rsp_iov); 5537 SMB2_set_info_free(&rqst); 5538 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base; 5539 5540 if (rc != 0) { 5541 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE); 5542 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid, 5543 ses->Suid, info_class, (__u32)info_type, rc); 5544 } 5545 5546 free_rsp_buf(resp_buftype, rsp); 5547 kfree(iov); 5548 5549 if (is_replayable_error(rc) && 5550 smb2_should_replay(tcon, &retries, &cur_sleep)) 5551 goto replay_again; 5552 5553 return rc; 5554 } 5555 5556 int 5557 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 5558 u64 volatile_fid, u32 pid, loff_t new_eof) 5559 { 5560 struct smb2_file_eof_info info; 5561 void *data; 5562 unsigned int size; 5563 5564 info.EndOfFile = cpu_to_le64(new_eof); 5565 5566 data = &info; 5567 size = sizeof(struct smb2_file_eof_info); 5568 5569 trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof); 5570 5571 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5572 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE, 5573 0, 1, &data, &size); 5574 } 5575 5576 int 5577 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon, 5578 u64 persistent_fid, u64 volatile_fid, 5579 struct cifs_ntsd *pnntsd, int pacllen, int aclflag) 5580 { 5581 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5582 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag, 5583 1, (void **)&pnntsd, &pacllen); 5584 } 5585 5586 int 5587 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon, 5588 u64 persistent_fid, u64 volatile_fid, 5589 struct smb2_file_full_ea_info *buf, int len) 5590 { 5591 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5592 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 5593 0, 1, (void **)&buf, &len); 5594 } 5595 5596 int 5597 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon, 5598 const u64 persistent_fid, const u64 volatile_fid, 5599 __u8 oplock_level) 5600 { 5601 struct smb_rqst rqst; 5602 int rc; 5603 struct smb2_oplock_break *req = NULL; 5604 struct cifs_ses *ses = tcon->ses; 5605 struct TCP_Server_Info *server; 5606 int flags = CIFS_OBREAK_OP; 5607 unsigned int total_len; 5608 struct kvec iov[1]; 5609 struct kvec rsp_iov; 5610 int resp_buf_type; 5611 int retries = 0, cur_sleep = 1; 5612 5613 replay_again: 5614 /* reinitialize for possible replay */ 5615 flags = CIFS_OBREAK_OP; 5616 server = cifs_pick_channel(ses); 5617 5618 cifs_dbg(FYI, "SMB2_oplock_break\n"); 5619 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server, 5620 (void **) &req, &total_len); 5621 if (rc) 5622 return rc; 5623 5624 if (smb3_encryption_required(tcon)) 5625 flags |= CIFS_TRANSFORM_REQ; 5626 5627 req->VolatileFid = volatile_fid; 5628 req->PersistentFid = persistent_fid; 5629 req->OplockLevel = oplock_level; 5630 req->hdr.CreditRequest = cpu_to_le16(1); 5631 5632 flags |= CIFS_NO_RSP_BUF; 5633 5634 iov[0].iov_base = (char *)req; 5635 iov[0].iov_len = total_len; 5636 5637 memset(&rqst, 0, sizeof(struct smb_rqst)); 5638 rqst.rq_iov = iov; 5639 rqst.rq_nvec = 1; 5640 5641 if (retries) 5642 smb2_set_replay(server, &rqst); 5643 5644 rc = cifs_send_recv(xid, ses, server, 5645 &rqst, &resp_buf_type, flags, &rsp_iov); 5646 cifs_small_buf_release(req); 5647 if (rc) { 5648 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); 5649 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc); 5650 } 5651 5652 if (is_replayable_error(rc) && 5653 smb2_should_replay(tcon, &retries, &cur_sleep)) 5654 goto replay_again; 5655 5656 return rc; 5657 } 5658 5659 void 5660 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf, 5661 struct kstatfs *kst) 5662 { 5663 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) * 5664 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit); 5665 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits); 5666 kst->f_bfree = kst->f_bavail = 5667 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits); 5668 return; 5669 } 5670 5671 static void 5672 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data, 5673 struct kstatfs *kst) 5674 { 5675 kst->f_bsize = le32_to_cpu(response_data->BlockSize); 5676 kst->f_blocks = le64_to_cpu(response_data->TotalBlocks); 5677 kst->f_bfree = le64_to_cpu(response_data->BlocksAvail); 5678 if (response_data->UserBlocksAvail == cpu_to_le64(-1)) 5679 kst->f_bavail = kst->f_bfree; 5680 else 5681 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail); 5682 if (response_data->TotalFileNodes != cpu_to_le64(-1)) 5683 kst->f_files = le64_to_cpu(response_data->TotalFileNodes); 5684 if (response_data->FreeFileNodes != cpu_to_le64(-1)) 5685 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes); 5686 5687 return; 5688 } 5689 5690 static int 5691 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, 5692 struct TCP_Server_Info *server, 5693 int level, int outbuf_len, u64 persistent_fid, 5694 u64 volatile_fid) 5695 { 5696 int rc; 5697 struct smb2_query_info_req *req; 5698 unsigned int total_len; 5699 5700 cifs_dbg(FYI, "Query FSInfo level %d\n", level); 5701 5702 if ((tcon->ses == NULL) || server == NULL) 5703 return -EIO; 5704 5705 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server, 5706 (void **) &req, &total_len); 5707 if (rc) 5708 return rc; 5709 5710 req->InfoType = SMB2_O_INFO_FILESYSTEM; 5711 req->FileInfoClass = level; 5712 req->PersistentFileId = persistent_fid; 5713 req->VolatileFileId = volatile_fid; 5714 /* 1 for pad */ 5715 req->InputBufferOffset = 5716 cpu_to_le16(sizeof(struct smb2_query_info_req)); 5717 req->OutputBufferLength = cpu_to_le32( 5718 outbuf_len + sizeof(struct smb2_query_info_rsp)); 5719 5720 iov->iov_base = (char *)req; 5721 iov->iov_len = total_len; 5722 return 0; 5723 } 5724 5725 static inline void free_qfs_info_req(struct kvec *iov) 5726 { 5727 cifs_buf_release(iov->iov_base); 5728 } 5729 5730 int 5731 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon, 5732 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) 5733 { 5734 struct smb_rqst rqst; 5735 struct smb2_query_info_rsp *rsp = NULL; 5736 struct kvec iov; 5737 struct kvec rsp_iov; 5738 int rc = 0; 5739 int resp_buftype; 5740 struct cifs_ses *ses = tcon->ses; 5741 struct TCP_Server_Info *server; 5742 FILE_SYSTEM_POSIX_INFO *info = NULL; 5743 int flags = 0; 5744 int retries = 0, cur_sleep = 1; 5745 5746 replay_again: 5747 /* reinitialize for possible replay */ 5748 flags = 0; 5749 server = cifs_pick_channel(ses); 5750 5751 rc = build_qfs_info_req(&iov, tcon, server, 5752 FS_POSIX_INFORMATION, 5753 sizeof(FILE_SYSTEM_POSIX_INFO), 5754 persistent_fid, volatile_fid); 5755 if (rc) 5756 return rc; 5757 5758 if (smb3_encryption_required(tcon)) 5759 flags |= CIFS_TRANSFORM_REQ; 5760 5761 memset(&rqst, 0, sizeof(struct smb_rqst)); 5762 rqst.rq_iov = &iov; 5763 rqst.rq_nvec = 1; 5764 5765 if (retries) 5766 smb2_set_replay(server, &rqst); 5767 5768 rc = cifs_send_recv(xid, ses, server, 5769 &rqst, &resp_buftype, flags, &rsp_iov); 5770 free_qfs_info_req(&iov); 5771 if (rc) { 5772 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 5773 goto posix_qfsinf_exit; 5774 } 5775 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 5776 5777 info = (FILE_SYSTEM_POSIX_INFO *)( 5778 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp); 5779 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 5780 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, 5781 sizeof(FILE_SYSTEM_POSIX_INFO)); 5782 if (!rc) 5783 copy_posix_fs_info_to_kstatfs(info, fsdata); 5784 5785 posix_qfsinf_exit: 5786 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 5787 5788 if (is_replayable_error(rc) && 5789 smb2_should_replay(tcon, &retries, &cur_sleep)) 5790 goto replay_again; 5791 5792 return rc; 5793 } 5794 5795 int 5796 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon, 5797 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) 5798 { 5799 struct smb_rqst rqst; 5800 struct smb2_query_info_rsp *rsp = NULL; 5801 struct kvec iov; 5802 struct kvec rsp_iov; 5803 int rc = 0; 5804 int resp_buftype; 5805 struct cifs_ses *ses = tcon->ses; 5806 struct TCP_Server_Info *server; 5807 struct smb2_fs_full_size_info *info = NULL; 5808 int flags = 0; 5809 int retries = 0, cur_sleep = 1; 5810 5811 replay_again: 5812 /* reinitialize for possible replay */ 5813 flags = 0; 5814 server = cifs_pick_channel(ses); 5815 5816 rc = build_qfs_info_req(&iov, tcon, server, 5817 FS_FULL_SIZE_INFORMATION, 5818 sizeof(struct smb2_fs_full_size_info), 5819 persistent_fid, volatile_fid); 5820 if (rc) 5821 return rc; 5822 5823 if (smb3_encryption_required(tcon)) 5824 flags |= CIFS_TRANSFORM_REQ; 5825 5826 memset(&rqst, 0, sizeof(struct smb_rqst)); 5827 rqst.rq_iov = &iov; 5828 rqst.rq_nvec = 1; 5829 5830 if (retries) 5831 smb2_set_replay(server, &rqst); 5832 5833 rc = cifs_send_recv(xid, ses, server, 5834 &rqst, &resp_buftype, flags, &rsp_iov); 5835 free_qfs_info_req(&iov); 5836 if (rc) { 5837 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 5838 goto qfsinf_exit; 5839 } 5840 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 5841 5842 info = (struct smb2_fs_full_size_info *)( 5843 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp); 5844 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 5845 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, 5846 sizeof(struct smb2_fs_full_size_info)); 5847 if (!rc) 5848 smb2_copy_fs_info_to_kstatfs(info, fsdata); 5849 5850 qfsinf_exit: 5851 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 5852 5853 if (is_replayable_error(rc) && 5854 smb2_should_replay(tcon, &retries, &cur_sleep)) 5855 goto replay_again; 5856 5857 return rc; 5858 } 5859 5860 int 5861 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon, 5862 u64 persistent_fid, u64 volatile_fid, int level) 5863 { 5864 struct smb_rqst rqst; 5865 struct smb2_query_info_rsp *rsp = NULL; 5866 struct kvec iov; 5867 struct kvec rsp_iov; 5868 int rc = 0; 5869 int resp_buftype, max_len, min_len; 5870 struct cifs_ses *ses = tcon->ses; 5871 struct TCP_Server_Info *server; 5872 unsigned int rsp_len, offset; 5873 int flags = 0; 5874 int retries = 0, cur_sleep = 1; 5875 5876 replay_again: 5877 /* reinitialize for possible replay */ 5878 flags = 0; 5879 server = cifs_pick_channel(ses); 5880 5881 if (level == FS_DEVICE_INFORMATION) { 5882 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO); 5883 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO); 5884 } else if (level == FS_ATTRIBUTE_INFORMATION) { 5885 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO); 5886 min_len = MIN_FS_ATTR_INFO_SIZE; 5887 } else if (level == FS_SECTOR_SIZE_INFORMATION) { 5888 max_len = sizeof(struct smb3_fs_ss_info); 5889 min_len = sizeof(struct smb3_fs_ss_info); 5890 } else if (level == FS_VOLUME_INFORMATION) { 5891 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN; 5892 min_len = sizeof(struct smb3_fs_vol_info); 5893 } else { 5894 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level); 5895 return -EINVAL; 5896 } 5897 5898 rc = build_qfs_info_req(&iov, tcon, server, 5899 level, max_len, 5900 persistent_fid, volatile_fid); 5901 if (rc) 5902 return rc; 5903 5904 if (smb3_encryption_required(tcon)) 5905 flags |= CIFS_TRANSFORM_REQ; 5906 5907 memset(&rqst, 0, sizeof(struct smb_rqst)); 5908 rqst.rq_iov = &iov; 5909 rqst.rq_nvec = 1; 5910 5911 if (retries) 5912 smb2_set_replay(server, &rqst); 5913 5914 rc = cifs_send_recv(xid, ses, server, 5915 &rqst, &resp_buftype, flags, &rsp_iov); 5916 free_qfs_info_req(&iov); 5917 if (rc) { 5918 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 5919 goto qfsattr_exit; 5920 } 5921 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 5922 5923 rsp_len = le32_to_cpu(rsp->OutputBufferLength); 5924 offset = le16_to_cpu(rsp->OutputBufferOffset); 5925 rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len); 5926 if (rc) 5927 goto qfsattr_exit; 5928 5929 if (level == FS_ATTRIBUTE_INFORMATION) 5930 memcpy(&tcon->fsAttrInfo, offset 5931 + (char *)rsp, min_t(unsigned int, 5932 rsp_len, max_len)); 5933 else if (level == FS_DEVICE_INFORMATION) 5934 memcpy(&tcon->fsDevInfo, offset 5935 + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO)); 5936 else if (level == FS_SECTOR_SIZE_INFORMATION) { 5937 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *) 5938 (offset + (char *)rsp); 5939 tcon->ss_flags = le32_to_cpu(ss_info->Flags); 5940 tcon->perf_sector_size = 5941 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf); 5942 } else if (level == FS_VOLUME_INFORMATION) { 5943 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *) 5944 (offset + (char *)rsp); 5945 tcon->vol_serial_number = vol_info->VolumeSerialNumber; 5946 tcon->vol_create_time = vol_info->VolumeCreationTime; 5947 } 5948 5949 qfsattr_exit: 5950 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 5951 5952 if (is_replayable_error(rc) && 5953 smb2_should_replay(tcon, &retries, &cur_sleep)) 5954 goto replay_again; 5955 5956 return rc; 5957 } 5958 5959 int 5960 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon, 5961 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, 5962 const __u32 num_lock, struct smb2_lock_element *buf) 5963 { 5964 struct smb_rqst rqst; 5965 int rc = 0; 5966 struct smb2_lock_req *req = NULL; 5967 struct kvec iov[2]; 5968 struct kvec rsp_iov; 5969 int resp_buf_type; 5970 unsigned int count; 5971 int flags = CIFS_NO_RSP_BUF; 5972 unsigned int total_len; 5973 struct TCP_Server_Info *server; 5974 int retries = 0, cur_sleep = 1; 5975 5976 replay_again: 5977 /* reinitialize for possible replay */ 5978 flags = CIFS_NO_RSP_BUF; 5979 server = cifs_pick_channel(tcon->ses); 5980 5981 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock); 5982 5983 rc = smb2_plain_req_init(SMB2_LOCK, tcon, server, 5984 (void **) &req, &total_len); 5985 if (rc) 5986 return rc; 5987 5988 if (smb3_encryption_required(tcon)) 5989 flags |= CIFS_TRANSFORM_REQ; 5990 5991 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid); 5992 req->LockCount = cpu_to_le16(num_lock); 5993 5994 req->PersistentFileId = persist_fid; 5995 req->VolatileFileId = volatile_fid; 5996 5997 count = num_lock * sizeof(struct smb2_lock_element); 5998 5999 iov[0].iov_base = (char *)req; 6000 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element); 6001 iov[1].iov_base = (char *)buf; 6002 iov[1].iov_len = count; 6003 6004 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks); 6005 6006 memset(&rqst, 0, sizeof(struct smb_rqst)); 6007 rqst.rq_iov = iov; 6008 rqst.rq_nvec = 2; 6009 6010 if (retries) 6011 smb2_set_replay(server, &rqst); 6012 6013 rc = cifs_send_recv(xid, tcon->ses, server, 6014 &rqst, &resp_buf_type, flags, 6015 &rsp_iov); 6016 cifs_small_buf_release(req); 6017 if (rc) { 6018 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc); 6019 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE); 6020 trace_smb3_lock_err(xid, persist_fid, tcon->tid, 6021 tcon->ses->Suid, rc); 6022 } 6023 6024 if (is_replayable_error(rc) && 6025 smb2_should_replay(tcon, &retries, &cur_sleep)) 6026 goto replay_again; 6027 6028 return rc; 6029 } 6030 6031 int 6032 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon, 6033 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, 6034 const __u64 length, const __u64 offset, const __u32 lock_flags, 6035 const bool wait) 6036 { 6037 struct smb2_lock_element lock; 6038 6039 lock.Offset = cpu_to_le64(offset); 6040 lock.Length = cpu_to_le64(length); 6041 lock.Flags = cpu_to_le32(lock_flags); 6042 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK) 6043 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY); 6044 6045 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock); 6046 } 6047 6048 int 6049 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon, 6050 __u8 *lease_key, const __le32 lease_state) 6051 { 6052 struct smb_rqst rqst; 6053 int rc; 6054 struct smb2_lease_ack *req = NULL; 6055 struct cifs_ses *ses = tcon->ses; 6056 int flags = CIFS_OBREAK_OP; 6057 unsigned int total_len; 6058 struct kvec iov[1]; 6059 struct kvec rsp_iov; 6060 int resp_buf_type; 6061 __u64 *please_key_high; 6062 __u64 *please_key_low; 6063 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses); 6064 6065 cifs_dbg(FYI, "SMB2_lease_break\n"); 6066 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server, 6067 (void **) &req, &total_len); 6068 if (rc) 6069 return rc; 6070 6071 if (smb3_encryption_required(tcon)) 6072 flags |= CIFS_TRANSFORM_REQ; 6073 6074 req->hdr.CreditRequest = cpu_to_le16(1); 6075 req->StructureSize = cpu_to_le16(36); 6076 total_len += 12; 6077 6078 memcpy(req->LeaseKey, lease_key, 16); 6079 req->LeaseState = lease_state; 6080 6081 flags |= CIFS_NO_RSP_BUF; 6082 6083 iov[0].iov_base = (char *)req; 6084 iov[0].iov_len = total_len; 6085 6086 memset(&rqst, 0, sizeof(struct smb_rqst)); 6087 rqst.rq_iov = iov; 6088 rqst.rq_nvec = 1; 6089 6090 rc = cifs_send_recv(xid, ses, server, 6091 &rqst, &resp_buf_type, flags, &rsp_iov); 6092 cifs_small_buf_release(req); 6093 6094 please_key_low = (__u64 *)lease_key; 6095 please_key_high = (__u64 *)(lease_key+8); 6096 if (rc) { 6097 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); 6098 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid, 6099 ses->Suid, *please_key_low, *please_key_high, rc); 6100 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc); 6101 } else 6102 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid, 6103 ses->Suid, *please_key_low, *please_key_high); 6104 6105 return rc; 6106 } 6107