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 <linux/netfs.h> 27 #include <trace/events/netfs.h> 28 #include "cifsglob.h" 29 #include "cifsproto.h" 30 #include "cifsacl.h" 31 #include "smb2proto.h" 32 #include "cifs_unicode.h" 33 #include "cifs_debug.h" 34 #include "ntlmssp.h" 35 #include "../common/smbfsctl.h" 36 #include "../common/smb2status.h" 37 #include "smb2glob.h" 38 #include "cifs_spnego.h" 39 #include "../common/smbdirect/smbdirect.h" 40 #include "smbdirect.h" 41 #include "trace.h" 42 #ifdef CONFIG_CIFS_DFS_UPCALL 43 #include "dfs_cache.h" 44 #endif 45 #include "cached_dir.h" 46 #include "compress.h" 47 #include "fs_context.h" 48 49 /* 50 * The following table defines the expected "StructureSize" of SMB2 requests 51 * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests. 52 * 53 * Note that commands are defined in smb2pdu.h in le16 but the array below is 54 * indexed by command in host byte order. 55 */ 56 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { 57 /* SMB2_NEGOTIATE */ 36, 58 /* SMB2_SESSION_SETUP */ 25, 59 /* SMB2_LOGOFF */ 4, 60 /* SMB2_TREE_CONNECT */ 9, 61 /* SMB2_TREE_DISCONNECT */ 4, 62 /* SMB2_CREATE */ 57, 63 /* SMB2_CLOSE */ 24, 64 /* SMB2_FLUSH */ 24, 65 /* SMB2_READ */ 49, 66 /* SMB2_WRITE */ 49, 67 /* SMB2_LOCK */ 48, 68 /* SMB2_IOCTL */ 57, 69 /* SMB2_CANCEL */ 4, 70 /* SMB2_ECHO */ 4, 71 /* SMB2_QUERY_DIRECTORY */ 33, 72 /* SMB2_CHANGE_NOTIFY */ 32, 73 /* SMB2_QUERY_INFO */ 41, 74 /* SMB2_SET_INFO */ 33, 75 /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */ 76 }; 77 78 int smb3_encryption_required(const struct cifs_tcon *tcon) 79 { 80 if (!tcon || !tcon->ses) 81 return 0; 82 if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) || 83 (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)) 84 return 1; 85 if (tcon->seal && 86 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 87 return 1; 88 if (((global_secflags & CIFSSEC_MUST_SEAL) == CIFSSEC_MUST_SEAL) && 89 (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 90 return 1; 91 return 0; 92 } 93 94 static void 95 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd, 96 const struct cifs_tcon *tcon, 97 struct TCP_Server_Info *server) 98 { 99 struct smb3_hdr_req *smb3_hdr; 100 101 shdr->ProtocolId = SMB2_PROTO_NUMBER; 102 shdr->StructureSize = cpu_to_le16(64); 103 shdr->Command = smb2_cmd; 104 105 if (server) { 106 /* After reconnect SMB3 must set ChannelSequence on subsequent reqs */ 107 if (server->dialect >= SMB30_PROT_ID) { 108 smb3_hdr = (struct smb3_hdr_req *)shdr; 109 /* 110 * if primary channel is not set yet, use default 111 * channel for chan sequence num 112 */ 113 if (SERVER_IS_CHAN(server)) 114 smb3_hdr->ChannelSequence = 115 cpu_to_le16(server->primary_server->channel_sequence_num); 116 else 117 smb3_hdr->ChannelSequence = 118 cpu_to_le16(server->channel_sequence_num); 119 } 120 spin_lock(&server->req_lock); 121 /* Request up to 10 credits but don't go over the limit. */ 122 if (server->credits >= server->max_credits) 123 shdr->CreditRequest = cpu_to_le16(0); 124 else 125 shdr->CreditRequest = cpu_to_le16( 126 min_t(int, server->max_credits - 127 server->credits, 10)); 128 spin_unlock(&server->req_lock); 129 } else { 130 shdr->CreditRequest = cpu_to_le16(2); 131 } 132 shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid); 133 134 if (!tcon) 135 goto out; 136 137 /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */ 138 /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */ 139 if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU)) 140 shdr->CreditCharge = cpu_to_le16(1); 141 /* else CreditCharge MBZ */ 142 143 shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid); 144 /* Uid is not converted */ 145 if (tcon->ses) 146 shdr->SessionId = cpu_to_le64(tcon->ses->Suid); 147 148 /* 149 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have 150 * to pass the path on the Open SMB prefixed by \\server\share. 151 * Not sure when we would need to do the augmented path (if ever) and 152 * setting this flag breaks the SMB2 open operation since it is 153 * illegal to send an empty path name (without \\server\share prefix) 154 * when the DFS flag is set in the SMB open header. We could 155 * consider setting the flag on all operations other than open 156 * but it is safer to net set it for now. 157 */ 158 /* if (tcon->share_flags & SHI1005_FLAGS_DFS) 159 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */ 160 161 if (server && server->sign && !smb3_encryption_required(tcon)) 162 shdr->Flags |= SMB2_FLAGS_SIGNED; 163 out: 164 return; 165 } 166 167 /* helper function for code reuse */ 168 static int 169 cifs_chan_skip_or_disable(struct cifs_ses *ses, 170 struct TCP_Server_Info *server, 171 bool from_reconnect, bool disable_mchan) 172 { 173 struct TCP_Server_Info *pserver; 174 unsigned int chan_index; 175 176 if (SERVER_IS_CHAN(server)) { 177 cifs_dbg(VFS, 178 "server %s does not support multichannel anymore. Skip secondary channel\n", 179 ses->server->hostname); 180 181 spin_lock(&ses->chan_lock); 182 chan_index = cifs_ses_get_chan_index(ses, server); 183 if (chan_index == CIFS_INVAL_CHAN_INDEX) { 184 spin_unlock(&ses->chan_lock); 185 goto skip_terminate; 186 } 187 188 ses->chans[chan_index].server = NULL; 189 server->terminate = true; 190 spin_unlock(&ses->chan_lock); 191 192 /* 193 * the above reference of server by channel 194 * needs to be dropped without holding chan_lock 195 * as cifs_put_tcp_session takes a higher lock 196 * i.e. cifs_tcp_ses_lock 197 */ 198 cifs_put_tcp_session(server, from_reconnect); 199 200 cifs_signal_cifsd_for_reconnect(server, false); 201 202 /* mark primary server as needing reconnect */ 203 pserver = server->primary_server; 204 cifs_signal_cifsd_for_reconnect(pserver, false); 205 skip_terminate: 206 return -EHOSTDOWN; 207 } 208 209 cifs_decrease_secondary_channels(ses, disable_mchan); 210 211 return 0; 212 } 213 214 /* 215 * smb3_update_ses_channels - Synchronize session channels with new configuration 216 * @ses: pointer to the CIFS session structure 217 * @server: pointer to the TCP server info structure 218 * @from_reconnect: indicates if called from reconnect context 219 * @disable_mchan: indicates if called from reconnect to disable multichannel 220 * 221 * Returns 0 on success or error code on failure. 222 * 223 * Outside of reconfigure, this function is called from cifs_mount() during mount 224 * and from reconnect scenarios to adjust channel count when the 225 * server's multichannel support changes. 226 */ 227 int smb3_update_ses_channels(struct cifs_ses *ses, struct TCP_Server_Info *server, 228 bool from_reconnect, bool disable_mchan) 229 { 230 int rc = 0; 231 /* 232 * Manage session channels based on current count vs max: 233 * - If disable requested, skip or disable the channel 234 * - If below max channels, attempt to add more 235 * - If above max channels, skip or disable excess channels 236 */ 237 if (disable_mchan) 238 rc = cifs_chan_skip_or_disable(ses, server, from_reconnect, disable_mchan); 239 else { 240 if (ses->chan_count < ses->chan_max) 241 rc = cifs_try_adding_channels(ses); 242 else if (ses->chan_count > ses->chan_max) 243 rc = cifs_chan_skip_or_disable(ses, server, from_reconnect, disable_mchan); 244 } 245 246 return rc; 247 } 248 249 static int 250 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon, 251 struct TCP_Server_Info *server, bool from_reconnect) 252 { 253 struct cifs_ses *ses; 254 int xid; 255 int rc = 0; 256 257 /* 258 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so 259 * check for tcp and smb session status done differently 260 * for those three - in the calling routine. 261 */ 262 if (tcon == NULL) 263 return 0; 264 265 if (smb2_command == SMB2_TREE_CONNECT) 266 return 0; 267 268 spin_lock(&tcon->tc_lock); 269 if (tcon->status == TID_EXITING) { 270 /* 271 * only tree disconnect allowed when disconnecting ... 272 */ 273 if (smb2_command != SMB2_TREE_DISCONNECT) { 274 spin_unlock(&tcon->tc_lock); 275 cifs_tcon_dbg(FYI, "can not send cmd %d while umounting\n", 276 smb2_command); 277 return -ENODEV; 278 } 279 } 280 spin_unlock(&tcon->tc_lock); 281 282 ses = tcon->ses; 283 if (!ses) 284 return smb_EIO(smb_eio_trace_null_pointers); 285 spin_lock(&ses->ses_lock); 286 if (ses->ses_status == SES_EXITING) { 287 spin_unlock(&ses->ses_lock); 288 return smb_EIO(smb_eio_trace_sess_exiting); 289 } 290 spin_unlock(&ses->ses_lock); 291 if (!ses->server || !server) 292 return smb_EIO(smb_eio_trace_null_pointers); 293 294 spin_lock(&server->srv_lock); 295 if (server->tcpStatus == CifsNeedReconnect) { 296 /* 297 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE 298 * here since they are implicitly done when session drops. 299 */ 300 switch (smb2_command) { 301 /* 302 * BB Should we keep oplock break and add flush to exceptions? 303 */ 304 case SMB2_TREE_DISCONNECT: 305 case SMB2_CANCEL: 306 case SMB2_CLOSE: 307 case SMB2_OPLOCK_BREAK: 308 spin_unlock(&server->srv_lock); 309 return -EAGAIN; 310 } 311 } 312 313 /* if server is marked for termination, cifsd will cleanup */ 314 if (server->terminate) { 315 spin_unlock(&server->srv_lock); 316 return -EHOSTDOWN; 317 } 318 spin_unlock(&server->srv_lock); 319 320 again: 321 rc = cifs_wait_for_server_reconnect(server, tcon->retry); 322 if (rc) 323 return rc; 324 325 spin_lock(&ses->chan_lock); 326 if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) { 327 spin_unlock(&ses->chan_lock); 328 return 0; 329 } 330 spin_unlock(&ses->chan_lock); 331 cifs_tcon_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d\n", 332 tcon->ses->chans_need_reconnect, 333 tcon->need_reconnect); 334 335 mutex_lock(&ses->session_mutex); 336 /* 337 * Handle the case where a concurrent thread failed to negotiate or 338 * killed a channel. 339 */ 340 spin_lock(&server->srv_lock); 341 switch (server->tcpStatus) { 342 case CifsExiting: 343 spin_unlock(&server->srv_lock); 344 mutex_unlock(&ses->session_mutex); 345 return -EHOSTDOWN; 346 case CifsNeedReconnect: 347 spin_unlock(&server->srv_lock); 348 mutex_unlock(&ses->session_mutex); 349 if (!tcon->retry) 350 return -EHOSTDOWN; 351 goto again; 352 default: 353 break; 354 } 355 spin_unlock(&server->srv_lock); 356 357 /* 358 * need to prevent multiple threads trying to simultaneously 359 * reconnect the same SMB session 360 */ 361 spin_lock(&ses->ses_lock); 362 spin_lock(&ses->chan_lock); 363 if (!cifs_chan_needs_reconnect(ses, server) && 364 ses->ses_status == SES_GOOD) { 365 spin_unlock(&ses->chan_lock); 366 spin_unlock(&ses->ses_lock); 367 /* this means that we only need to tree connect */ 368 if (tcon->need_reconnect) 369 goto skip_sess_setup; 370 371 mutex_unlock(&ses->session_mutex); 372 goto out; 373 } 374 spin_unlock(&ses->chan_lock); 375 spin_unlock(&ses->ses_lock); 376 377 rc = cifs_negotiate_protocol(0, ses, server); 378 if (rc) { 379 mutex_unlock(&ses->session_mutex); 380 if (!tcon->retry) 381 return -EHOSTDOWN; 382 goto again; 383 } 384 /* 385 * if server stopped supporting multichannel 386 * and the first channel reconnected, disable all the others. 387 */ 388 if (ses->chan_count > 1 && 389 !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) { 390 rc = smb3_update_ses_channels(ses, server, 391 from_reconnect, true /* disable_mchan */); 392 if (rc) { 393 mutex_unlock(&ses->session_mutex); 394 goto out; 395 } 396 } 397 398 rc = cifs_setup_session(0, ses, server, ses->local_nls); 399 if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) { 400 /* 401 * Try alternate password for next reconnect (key rotation 402 * could be enabled on the server e.g.) if an alternate 403 * password is available and the current password is expired, 404 * but do not swap on non pwd related errors like host down 405 */ 406 if (ses->password2) 407 swap(ses->password2, ses->password); 408 } 409 if (rc) { 410 mutex_unlock(&ses->session_mutex); 411 if (rc == -EACCES && !tcon->retry) 412 return -EHOSTDOWN; 413 goto out; 414 } 415 416 skip_sess_setup: 417 if (!tcon->need_reconnect) { 418 mutex_unlock(&ses->session_mutex); 419 goto out; 420 } 421 cifs_mark_open_files_invalid(tcon); 422 if (tcon->use_persistent) 423 tcon->need_reopen_files = true; 424 425 rc = cifs_tree_connect(0, tcon); 426 427 cifs_tcon_dbg(FYI, "reconnect tcon rc = %d\n", rc); 428 if (rc) { 429 /* If sess reconnected but tcon didn't, something strange ... */ 430 mutex_unlock(&ses->session_mutex); 431 cifs_tcon_dbg(VFS, "reconnect tcon failed rc = %d\n", rc); 432 goto out; 433 } 434 435 spin_lock(&ses->ses_lock); 436 if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) { 437 spin_unlock(&ses->ses_lock); 438 mutex_unlock(&ses->session_mutex); 439 goto skip_add_channels; 440 } 441 ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS; 442 spin_unlock(&ses->ses_lock); 443 444 if (!rc && 445 (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) && 446 server->ops->query_server_interfaces) { 447 /* 448 * query server network interfaces, in case they change. 449 * Also mark the session as pending this update while the query 450 * is in progress. This will be used to avoid calling 451 * smb2_reconnect recursively. 452 */ 453 ses->flags |= CIFS_SES_FLAGS_PENDING_QUERY_INTERFACES; 454 xid = get_xid(); 455 rc = server->ops->query_server_interfaces(xid, tcon, false); 456 free_xid(xid); 457 ses->flags &= ~CIFS_SES_FLAGS_PENDING_QUERY_INTERFACES; 458 459 if (!tcon->ipc && !tcon->dummy) 460 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces, 461 (SMB_INTERFACE_POLL_INTERVAL * HZ)); 462 463 mutex_unlock(&ses->session_mutex); 464 465 if (rc == -EOPNOTSUPP && ses->chan_count > 1) { 466 /* 467 * some servers like Azure SMB server do not advertise 468 * that multichannel has been disabled with server 469 * capabilities, rather return STATUS_NOT_IMPLEMENTED. 470 * treat this as server not supporting multichannel 471 */ 472 473 rc = smb3_update_ses_channels(ses, server, 474 from_reconnect, 475 true /* disable_mchan */); 476 goto skip_add_channels; 477 } else if (rc) 478 cifs_tcon_dbg(FYI, "%s: failed to query server interfaces: %d\n", 479 __func__, rc); 480 481 if (ses->chan_max > ses->chan_count && 482 ses->iface_count && 483 !SERVER_IS_CHAN(server)) { 484 if (ses->chan_count == 1) 485 cifs_server_dbg(VFS, "supports multichannel now\n"); 486 487 smb3_update_ses_channels(ses, server, from_reconnect, 488 false /* disable_mchan */); 489 } 490 } else { 491 mutex_unlock(&ses->session_mutex); 492 } 493 494 skip_add_channels: 495 spin_lock(&ses->ses_lock); 496 ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS; 497 spin_unlock(&ses->ses_lock); 498 499 if (smb2_command != SMB2_INTERNAL_CMD) 500 cifs_queue_server_reconn(server); 501 502 atomic_inc(&tconInfoReconnectCount); 503 out: 504 /* 505 * Check if handle based operation so we know whether we can continue 506 * or not without returning to caller to reset file handle. 507 */ 508 /* 509 * BB Is flush done by server on drop of tcp session? Should we special 510 * case it and skip above? 511 */ 512 switch (smb2_command) { 513 case SMB2_FLUSH: 514 case SMB2_READ: 515 case SMB2_WRITE: 516 case SMB2_LOCK: 517 case SMB2_QUERY_DIRECTORY: 518 case SMB2_CHANGE_NOTIFY: 519 case SMB2_QUERY_INFO: 520 case SMB2_SET_INFO: 521 case SMB2_IOCTL: 522 rc = -EAGAIN; 523 } 524 return rc; 525 } 526 527 static void 528 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, 529 struct TCP_Server_Info *server, 530 void *buf, 531 unsigned int *total_len) 532 { 533 struct smb2_pdu *spdu = buf; 534 /* lookup word count ie StructureSize from table */ 535 __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)]; 536 537 /* 538 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of 539 * largest operations (Create) 540 */ 541 memset(buf, 0, 256); 542 543 smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server); 544 spdu->StructureSize2 = cpu_to_le16(parmsize); 545 546 *total_len = parmsize + sizeof(struct smb2_hdr); 547 } 548 549 /* 550 * Allocate and return pointer to an SMB request hdr, and set basic 551 * SMB information in the SMB header. If the return code is zero, this 552 * function must have filled in request_buf pointer. 553 */ 554 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon, 555 struct TCP_Server_Info *server, 556 void **request_buf, unsigned int *total_len) 557 { 558 /* BB eventually switch this to SMB2 specific small buf size */ 559 switch (smb2_command) { 560 case SMB2_SET_INFO: 561 case SMB2_QUERY_INFO: 562 *request_buf = cifs_buf_get(); 563 break; 564 default: 565 *request_buf = cifs_small_buf_get(); 566 break; 567 } 568 if (*request_buf == NULL) { 569 /* BB should we add a retry in here if not a writepage? */ 570 return -ENOMEM; 571 } 572 573 fill_small_buf(smb2_command, tcon, server, 574 (struct smb2_hdr *)(*request_buf), 575 total_len); 576 577 if (tcon != NULL) { 578 uint16_t com_code = le16_to_cpu(smb2_command); 579 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]); 580 cifs_stats_inc(&tcon->num_smbs_sent); 581 } 582 583 return 0; 584 } 585 586 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon, 587 struct TCP_Server_Info *server, 588 void **request_buf, unsigned int *total_len) 589 { 590 int rc; 591 592 rc = smb2_reconnect(smb2_command, tcon, server, false); 593 if (rc) 594 return rc; 595 596 return __smb2_plain_req_init(smb2_command, tcon, server, request_buf, 597 total_len); 598 } 599 600 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon, 601 struct TCP_Server_Info *server, 602 void **request_buf, unsigned int *total_len) 603 { 604 /* 605 * Skip reconnect in one of the following cases: 606 * 1. For FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs 607 * 2. For FSCTL_QUERY_NETWORK_INTERFACE_INFO IOCTL when called from 608 * smb2_reconnect (indicated by CIFS_SES_FLAG_SCALE_CHANNELS ses flag) 609 */ 610 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO || 611 (opcode == FSCTL_QUERY_NETWORK_INTERFACE_INFO && 612 (tcon->ses->flags & CIFS_SES_FLAGS_PENDING_QUERY_INTERFACES))) 613 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server, 614 request_buf, total_len); 615 616 return smb2_plain_req_init(SMB2_IOCTL, tcon, server, 617 request_buf, total_len); 618 } 619 620 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */ 621 622 static void 623 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt) 624 { 625 pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES; 626 pneg_ctxt->DataLength = cpu_to_le16(38); 627 pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1); 628 pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE); 629 get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE); 630 pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512; 631 } 632 633 static void 634 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt) 635 { 636 pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES; 637 pneg_ctxt->DataLength = 638 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context) 639 - sizeof(struct smb2_neg_context)); 640 pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3); 641 pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77; 642 pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF; 643 pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1; 644 } 645 646 static unsigned int 647 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt) 648 { 649 unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities); 650 unsigned short num_algs = 1; /* number of signing algorithms sent */ 651 652 pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES; 653 /* 654 * Context Data length must be rounded to multiple of 8 for some servers 655 */ 656 pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) - 657 sizeof(struct smb2_neg_context) + 658 (num_algs * sizeof(u16)), 8)); 659 pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs); 660 pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC); 661 662 ctxt_len += sizeof(__le16) * num_algs; 663 ctxt_len = ALIGN(ctxt_len, 8); 664 return ctxt_len; 665 /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */ 666 } 667 668 static void 669 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt) 670 { 671 pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES; 672 if (require_gcm_256) { 673 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */ 674 pneg_ctxt->CipherCount = cpu_to_le16(1); 675 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM; 676 } else if (enable_gcm_256) { 677 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */ 678 pneg_ctxt->CipherCount = cpu_to_le16(3); 679 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM; 680 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM; 681 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM; 682 } else { 683 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */ 684 pneg_ctxt->CipherCount = cpu_to_le16(2); 685 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM; 686 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM; 687 } 688 } 689 690 static unsigned int 691 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname) 692 { 693 struct nls_table *cp = load_nls_default(); 694 695 pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID; 696 697 /* copy up to max of first 100 bytes of server name to NetName field */ 698 pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp)); 699 /* context size is DataLength + minimal smb2_neg_context */ 700 return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8); 701 } 702 703 static void 704 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt) 705 { 706 pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE; 707 pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN); 708 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ 709 pneg_ctxt->Name[0] = 0x93; 710 pneg_ctxt->Name[1] = 0xAD; 711 pneg_ctxt->Name[2] = 0x25; 712 pneg_ctxt->Name[3] = 0x50; 713 pneg_ctxt->Name[4] = 0x9C; 714 pneg_ctxt->Name[5] = 0xB4; 715 pneg_ctxt->Name[6] = 0x11; 716 pneg_ctxt->Name[7] = 0xE7; 717 pneg_ctxt->Name[8] = 0xB4; 718 pneg_ctxt->Name[9] = 0x23; 719 pneg_ctxt->Name[10] = 0x83; 720 pneg_ctxt->Name[11] = 0xDE; 721 pneg_ctxt->Name[12] = 0x96; 722 pneg_ctxt->Name[13] = 0x8B; 723 pneg_ctxt->Name[14] = 0xCD; 724 pneg_ctxt->Name[15] = 0x7C; 725 } 726 727 static void 728 assemble_neg_contexts(struct smb2_negotiate_req *req, 729 struct TCP_Server_Info *server, unsigned int *total_len) 730 { 731 unsigned int ctxt_len, neg_context_count; 732 struct TCP_Server_Info *pserver; 733 char *pneg_ctxt; 734 char *hostname; 735 736 if (*total_len > 200) { 737 /* In case length corrupted don't want to overrun smb buffer */ 738 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n"); 739 return; 740 } 741 742 /* 743 * round up total_len of fixed part of SMB3 negotiate request to 8 744 * byte boundary before adding negotiate contexts 745 */ 746 *total_len = ALIGN(*total_len, 8); 747 748 pneg_ctxt = (*total_len) + (char *)req; 749 req->NegotiateContextOffset = cpu_to_le32(*total_len); 750 751 build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt); 752 ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8); 753 *total_len += ctxt_len; 754 pneg_ctxt += ctxt_len; 755 756 build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt); 757 ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8); 758 *total_len += ctxt_len; 759 pneg_ctxt += ctxt_len; 760 761 /* 762 * secondary channels don't have the hostname field populated 763 * use the hostname field in the primary channel instead 764 */ 765 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 766 cifs_server_lock(pserver); 767 hostname = pserver->hostname; 768 if (hostname && (hostname[0] != 0)) { 769 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt, 770 hostname); 771 *total_len += ctxt_len; 772 pneg_ctxt += ctxt_len; 773 neg_context_count = 3; 774 } else 775 neg_context_count = 2; 776 cifs_server_unlock(pserver); 777 778 build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt); 779 *total_len += sizeof(struct smb2_posix_neg_context); 780 pneg_ctxt += sizeof(struct smb2_posix_neg_context); 781 neg_context_count++; 782 783 if (server->compression.requested) { 784 build_compression_ctxt((struct smb2_compression_capabilities_context *) 785 pneg_ctxt); 786 ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8); 787 *total_len += ctxt_len; 788 pneg_ctxt += ctxt_len; 789 neg_context_count++; 790 } 791 792 if (enable_negotiate_signing) { 793 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *) 794 pneg_ctxt); 795 *total_len += ctxt_len; 796 pneg_ctxt += ctxt_len; 797 neg_context_count++; 798 } 799 800 /* check for and add transport_capabilities and signing capabilities */ 801 req->NegotiateContextCount = cpu_to_le16(neg_context_count); 802 803 } 804 805 /* If invalid preauth context warn but use what we requested, SHA-512 */ 806 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt) 807 { 808 unsigned int len = le16_to_cpu(ctxt->DataLength); 809 810 /* 811 * Caller checked that DataLength remains within SMB boundary. We still 812 * need to confirm that one HashAlgorithms member is accounted for. 813 */ 814 if (len < MIN_PREAUTH_CTXT_DATA_LEN) { 815 pr_warn_once("server sent bad preauth context\n"); 816 return; 817 } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) { 818 pr_warn_once("server sent invalid SaltLength\n"); 819 return; 820 } 821 if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1) 822 pr_warn_once("Invalid SMB3 hash algorithm count\n"); 823 if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512) 824 pr_warn_once("unknown SMB3 hash algorithm\n"); 825 } 826 827 static void decode_compress_ctx(struct TCP_Server_Info *server, 828 struct smb2_compression_capabilities_context *ctxt) 829 { 830 unsigned int len = le16_to_cpu(ctxt->DataLength); 831 __le16 alg; 832 833 server->compression.enabled = false; 834 835 /* 836 * Caller checked that DataLength remains within SMB boundary. We still 837 * need to confirm that one CompressionAlgorithms member is accounted 838 * for. 839 */ 840 if (len < 10) { 841 pr_warn_once("server sent bad compression cntxt\n"); 842 return; 843 } 844 845 if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) { 846 pr_warn_once("invalid SMB3 compress algorithm count\n"); 847 return; 848 } 849 850 alg = ctxt->CompressionAlgorithms[0]; 851 852 /* 'NONE' (0) compressor type is never negotiated */ 853 if (alg == 0 || le16_to_cpu(alg) > 3) { 854 pr_warn_once("invalid compression algorithm '%u'\n", alg); 855 return; 856 } 857 858 server->compression.alg = alg; 859 server->compression.enabled = true; 860 } 861 862 static int decode_encrypt_ctx(struct TCP_Server_Info *server, 863 struct smb2_encryption_neg_context *ctxt) 864 { 865 unsigned int len = le16_to_cpu(ctxt->DataLength); 866 867 cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len); 868 /* 869 * Caller checked that DataLength remains within SMB boundary. We still 870 * need to confirm that one Cipher flexible array member is accounted 871 * for. 872 */ 873 if (len < MIN_ENCRYPT_CTXT_DATA_LEN) { 874 pr_warn_once("server sent bad crypto ctxt len\n"); 875 return -EINVAL; 876 } 877 878 if (le16_to_cpu(ctxt->CipherCount) != 1) { 879 pr_warn_once("Invalid SMB3.11 cipher count\n"); 880 return -EINVAL; 881 } 882 cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0])); 883 if (require_gcm_256) { 884 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) { 885 cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n"); 886 return -EOPNOTSUPP; 887 } 888 } else if (ctxt->Ciphers[0] == 0) { 889 /* 890 * e.g. if server only supported AES256_CCM (very unlikely) 891 * or server supported no encryption types or had all disabled. 892 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case 893 * in which mount requested encryption ("seal") checks later 894 * on during tree connection will return proper rc, but if 895 * seal not requested by client, since server is allowed to 896 * return 0 to indicate no supported cipher, we can't fail here 897 */ 898 server->cipher_type = 0; 899 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION; 900 pr_warn_once("Server does not support requested encryption types\n"); 901 return 0; 902 } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) && 903 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) && 904 (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) { 905 /* server returned a cipher we didn't ask for */ 906 pr_warn_once("Invalid SMB3.11 cipher returned\n"); 907 return -EINVAL; 908 } 909 server->cipher_type = ctxt->Ciphers[0]; 910 server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION; 911 return 0; 912 } 913 914 static void decode_signing_ctx(struct TCP_Server_Info *server, 915 struct smb2_signing_capabilities *pctxt) 916 { 917 unsigned int len = le16_to_cpu(pctxt->DataLength); 918 919 /* 920 * Caller checked that DataLength remains within SMB boundary. We still 921 * need to confirm that one SigningAlgorithms flexible array member is 922 * accounted for. 923 */ 924 if ((len < 4) || (len > 16)) { 925 pr_warn_once("server sent bad signing negcontext\n"); 926 return; 927 } 928 if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) { 929 pr_warn_once("Invalid signing algorithm count\n"); 930 return; 931 } 932 if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) { 933 pr_warn_once("unknown signing algorithm\n"); 934 return; 935 } 936 937 server->signing_negotiated = true; 938 server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]); 939 cifs_dbg(FYI, "signing algorithm %d chosen\n", 940 server->signing_algorithm); 941 } 942 943 944 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp, 945 struct TCP_Server_Info *server, 946 unsigned int len_of_smb) 947 { 948 struct smb2_neg_context *pctx; 949 unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset); 950 unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount); 951 unsigned int len_of_ctxts, i; 952 int rc = 0; 953 954 cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt); 955 if (len_of_smb <= offset) { 956 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n"); 957 return -EINVAL; 958 } 959 960 len_of_ctxts = len_of_smb - offset; 961 962 for (i = 0; i < ctxt_cnt; i++) { 963 int clen; 964 /* check that offset is not beyond end of SMB */ 965 if (len_of_ctxts < sizeof(struct smb2_neg_context)) 966 break; 967 968 pctx = (struct smb2_neg_context *)(offset + (char *)rsp); 969 clen = sizeof(struct smb2_neg_context) 970 + le16_to_cpu(pctx->DataLength); 971 /* 972 * 2.2.4 SMB2 NEGOTIATE Response 973 * Subsequent negotiate contexts MUST appear at the first 8-byte 974 * aligned offset following the previous negotiate context. 975 */ 976 if (i + 1 != ctxt_cnt) 977 clen = ALIGN(clen, 8); 978 if (clen > len_of_ctxts) 979 break; 980 981 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES) 982 decode_preauth_context( 983 (struct smb2_preauth_neg_context *)pctx); 984 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES) 985 rc = decode_encrypt_ctx(server, 986 (struct smb2_encryption_neg_context *)pctx); 987 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES) 988 decode_compress_ctx(server, 989 (struct smb2_compression_capabilities_context *)pctx); 990 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE) 991 server->posix_ext_supported = true; 992 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES) 993 decode_signing_ctx(server, 994 (struct smb2_signing_capabilities *)pctx); 995 else 996 cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n", 997 le16_to_cpu(pctx->ContextType)); 998 if (rc) 999 break; 1000 1001 offset += clen; 1002 len_of_ctxts -= clen; 1003 } 1004 return rc; 1005 } 1006 1007 static struct create_posix * 1008 create_posix_buf(umode_t mode) 1009 { 1010 struct create_posix *buf; 1011 1012 buf = kzalloc_obj(struct create_posix); 1013 if (!buf) 1014 return NULL; 1015 1016 buf->ccontext.DataOffset = 1017 cpu_to_le16(offsetof(struct create_posix, Mode)); 1018 buf->ccontext.DataLength = cpu_to_le32(4); 1019 buf->ccontext.NameOffset = 1020 cpu_to_le16(offsetof(struct create_posix, Name)); 1021 buf->ccontext.NameLength = cpu_to_le16(16); 1022 1023 /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */ 1024 buf->Name[0] = 0x93; 1025 buf->Name[1] = 0xAD; 1026 buf->Name[2] = 0x25; 1027 buf->Name[3] = 0x50; 1028 buf->Name[4] = 0x9C; 1029 buf->Name[5] = 0xB4; 1030 buf->Name[6] = 0x11; 1031 buf->Name[7] = 0xE7; 1032 buf->Name[8] = 0xB4; 1033 buf->Name[9] = 0x23; 1034 buf->Name[10] = 0x83; 1035 buf->Name[11] = 0xDE; 1036 buf->Name[12] = 0x96; 1037 buf->Name[13] = 0x8B; 1038 buf->Name[14] = 0xCD; 1039 buf->Name[15] = 0x7C; 1040 buf->Mode = cpu_to_le32(mode); 1041 cifs_dbg(FYI, "mode on posix create 0%o\n", mode); 1042 return buf; 1043 } 1044 1045 static int 1046 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode) 1047 { 1048 unsigned int num = *num_iovec; 1049 1050 iov[num].iov_base = create_posix_buf(mode); 1051 if (mode == ACL_NO_MODE) 1052 cifs_dbg(FYI, "%s: no mode\n", __func__); 1053 if (iov[num].iov_base == NULL) 1054 return -ENOMEM; 1055 iov[num].iov_len = sizeof(struct create_posix); 1056 *num_iovec = num + 1; 1057 return 0; 1058 } 1059 1060 1061 /* 1062 * 1063 * SMB2 Worker functions follow: 1064 * 1065 * The general structure of the worker functions is: 1066 * 1) Call smb2_init (assembles SMB2 header) 1067 * 2) Initialize SMB2 command specific fields in fixed length area of SMB 1068 * 3) Call smb_sendrcv2 (sends request on socket and waits for response) 1069 * 4) Decode SMB2 command specific fields in the fixed length area 1070 * 5) Decode variable length data area (if any for this SMB2 command type) 1071 * 6) Call free smb buffer 1072 * 7) return 1073 * 1074 */ 1075 1076 int 1077 SMB2_negotiate(const unsigned int xid, 1078 struct cifs_ses *ses, 1079 struct TCP_Server_Info *server) 1080 { 1081 struct smb_rqst rqst; 1082 struct smb2_negotiate_req *req; 1083 struct smb2_negotiate_rsp *rsp; 1084 struct kvec iov[1]; 1085 struct kvec rsp_iov; 1086 int rc; 1087 int resp_buftype; 1088 int blob_offset, blob_length; 1089 char *security_blob; 1090 int flags = CIFS_NEG_OP; 1091 unsigned int total_len; 1092 1093 cifs_dbg(FYI, "Negotiate protocol\n"); 1094 1095 if (!server) { 1096 WARN(1, "%s: server is NULL!\n", __func__); 1097 return smb_EIO(smb_eio_trace_null_pointers); 1098 } 1099 1100 rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server, 1101 (void **) &req, &total_len); 1102 if (rc) 1103 return rc; 1104 1105 req->hdr.SessionId = 0; 1106 1107 memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE); 1108 memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE); 1109 1110 if (strcmp(server->vals->version_string, 1111 SMB3ANY_VERSION_STRING) == 0) { 1112 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); 1113 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); 1114 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID); 1115 req->DialectCount = cpu_to_le16(3); 1116 total_len += 6; 1117 } else if (strcmp(server->vals->version_string, 1118 SMBDEFAULT_VERSION_STRING) == 0) { 1119 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); 1120 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); 1121 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); 1122 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID); 1123 req->DialectCount = cpu_to_le16(4); 1124 total_len += 8; 1125 } else { 1126 /* otherwise send specific dialect */ 1127 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id); 1128 req->DialectCount = cpu_to_le16(1); 1129 total_len += 2; 1130 } 1131 1132 /* only one of SMB2 signing flags may be set in SMB2 request */ 1133 if (ses->sign) 1134 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); 1135 else if (global_secflags & CIFSSEC_MAY_SIGN) 1136 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); 1137 else 1138 req->SecurityMode = 0; 1139 1140 req->Capabilities = cpu_to_le32(server->vals->req_capabilities); 1141 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL); 1142 1143 /* ClientGUID must be zero for SMB2.02 dialect */ 1144 if (server->vals->protocol_id == SMB20_PROT_ID) 1145 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE); 1146 else { 1147 memcpy(req->ClientGUID, server->client_guid, 1148 SMB2_CLIENT_GUID_SIZE); 1149 if ((server->vals->protocol_id == SMB311_PROT_ID) || 1150 (strcmp(server->vals->version_string, 1151 SMB3ANY_VERSION_STRING) == 0) || 1152 (strcmp(server->vals->version_string, 1153 SMBDEFAULT_VERSION_STRING) == 0)) 1154 assemble_neg_contexts(req, server, &total_len); 1155 } 1156 iov[0].iov_base = (char *)req; 1157 iov[0].iov_len = total_len; 1158 1159 memset(&rqst, 0, sizeof(struct smb_rqst)); 1160 rqst.rq_iov = iov; 1161 rqst.rq_nvec = 1; 1162 1163 rc = cifs_send_recv(xid, ses, server, 1164 &rqst, &resp_buftype, flags, &rsp_iov); 1165 cifs_small_buf_release(req); 1166 rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base; 1167 /* 1168 * No tcon so can't do 1169 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); 1170 */ 1171 if (rc == -EOPNOTSUPP) { 1172 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"); 1173 goto neg_exit; 1174 } else if (rc != 0) 1175 goto neg_exit; 1176 1177 u16 dialect = le16_to_cpu(rsp->DialectRevision); 1178 if (strcmp(server->vals->version_string, 1179 SMB3ANY_VERSION_STRING) == 0) { 1180 switch (dialect) { 1181 case SMB20_PROT_ID: 1182 cifs_server_dbg(VFS, 1183 "SMB2 dialect returned but not requested\n"); 1184 rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect, dialect, 3); 1185 goto neg_exit; 1186 case SMB21_PROT_ID: 1187 cifs_server_dbg(VFS, 1188 "SMB2.1 dialect returned but not requested\n"); 1189 rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect, dialect, 3); 1190 goto neg_exit; 1191 case SMB311_PROT_ID: 1192 /* ops set to 3.0 by default for default so update */ 1193 server->ops = &smb311_operations; 1194 server->vals = &smb311_values; 1195 break; 1196 default: 1197 break; 1198 } 1199 } else if (strcmp(server->vals->version_string, 1200 SMBDEFAULT_VERSION_STRING) == 0) { 1201 switch (dialect) { 1202 case SMB20_PROT_ID: 1203 cifs_server_dbg(VFS, 1204 "SMB2 dialect returned but not requested\n"); 1205 rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect, dialect, 0); 1206 goto neg_exit; 1207 case SMB21_PROT_ID: 1208 /* ops set to 3.0 by default for default so update */ 1209 server->ops = &smb21_operations; 1210 server->vals = &smb21_values; 1211 break; 1212 case SMB311_PROT_ID: 1213 server->ops = &smb311_operations; 1214 server->vals = &smb311_values; 1215 break; 1216 default: 1217 break; 1218 } 1219 } else if (dialect != server->vals->protocol_id) { 1220 /* if requested single dialect ensure returned dialect matched */ 1221 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n", 1222 dialect); 1223 rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect, 1224 dialect, server->vals->protocol_id); 1225 goto neg_exit; 1226 } 1227 1228 cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode); 1229 1230 switch (dialect) { 1231 case SMB20_PROT_ID: 1232 cifs_dbg(FYI, "negotiated smb2.0 dialect\n"); 1233 break; 1234 case SMB21_PROT_ID: 1235 cifs_dbg(FYI, "negotiated smb2.1 dialect\n"); 1236 break; 1237 case SMB30_PROT_ID: 1238 cifs_dbg(FYI, "negotiated smb3.0 dialect\n"); 1239 break; 1240 case SMB302_PROT_ID: 1241 cifs_dbg(FYI, "negotiated smb3.02 dialect\n"); 1242 break; 1243 case SMB311_PROT_ID: 1244 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n"); 1245 break; 1246 default: 1247 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n", 1248 dialect); 1249 rc = smb_EIO1(smb_eio_trace_neg_inval_dialect, dialect); 1250 goto neg_exit; 1251 } 1252 1253 rc = 0; 1254 server->dialect = dialect; 1255 1256 /* 1257 * Keep a copy of the hash after negprot. This hash will be 1258 * the starting hash value for all sessions made from this 1259 * server. 1260 */ 1261 memcpy(server->preauth_sha_hash, ses->preauth_sha_hash, 1262 SMB2_PREAUTH_HASH_SIZE); 1263 1264 /* SMB2 only has an extended negflavor */ 1265 server->negflavor = CIFS_NEGFLAVOR_EXTENDED; 1266 /* set it to the maximum buffer size value we can send with 1 credit */ 1267 server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize), 1268 SMB2_MAX_BUFFER_SIZE); 1269 server->max_read = le32_to_cpu(rsp->MaxReadSize); 1270 server->max_write = le32_to_cpu(rsp->MaxWriteSize); 1271 server->sec_mode = le16_to_cpu(rsp->SecurityMode); 1272 if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode) 1273 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n", 1274 server->sec_mode); 1275 server->capabilities = le32_to_cpu(rsp->Capabilities); 1276 /* Internal types */ 1277 server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES; 1278 1279 /* 1280 * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context 1281 * Set the cipher type manually. 1282 */ 1283 if ((server->dialect == SMB30_PROT_ID || 1284 server->dialect == SMB302_PROT_ID) && 1285 (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 1286 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM; 1287 1288 security_blob = smb2_get_data_area_len(&blob_offset, &blob_length, 1289 (struct smb2_hdr *)rsp); 1290 /* 1291 * See MS-SMB2 section 2.2.4: if no blob, client picks default which 1292 * for us will be 1293 * ses->sectype = RawNTLMSSP; 1294 * but for time being this is our only auth choice so doesn't matter. 1295 * We just found a server which sets blob length to zero expecting raw. 1296 */ 1297 if (blob_length == 0) { 1298 cifs_dbg(FYI, "missing security blob on negprot\n"); 1299 server->sec_ntlmssp = true; 1300 } 1301 1302 rc = cifs_enable_signing(server, ses->sign); 1303 if (rc) 1304 goto neg_exit; 1305 if (blob_length) { 1306 rc = decode_negTokenInit(security_blob, blob_length, server); 1307 if (rc == 1) 1308 rc = 0; 1309 else if (rc == 0) 1310 rc = smb_EIO1(smb_eio_trace_neg_decode_token, rc); 1311 } 1312 1313 if (server->dialect == SMB311_PROT_ID) { 1314 if (rsp->NegotiateContextCount) 1315 rc = smb311_decode_neg_context(rsp, server, 1316 rsp_iov.iov_len); 1317 else 1318 cifs_server_dbg(VFS, "Missing expected negotiate contexts\n"); 1319 } 1320 1321 if (server->cipher_type && !rc) 1322 rc = smb3_crypto_aead_allocate(server); 1323 neg_exit: 1324 free_rsp_buf(resp_buftype, rsp); 1325 return rc; 1326 } 1327 1328 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) 1329 { 1330 int rc; 1331 struct validate_negotiate_info_req *pneg_inbuf; 1332 struct validate_negotiate_info_rsp *pneg_rsp = NULL; 1333 u32 rsplen; 1334 u32 inbuflen; /* max of 4 dialects */ 1335 struct TCP_Server_Info *server = tcon->ses->server; 1336 1337 cifs_dbg(FYI, "validate negotiate\n"); 1338 1339 /* In SMB3.11 preauth integrity supersedes validate negotiate */ 1340 if (server->dialect == SMB311_PROT_ID) 1341 return 0; 1342 1343 /* 1344 * validation ioctl must be signed, so no point sending this if we 1345 * can not sign it (ie are not known user). Even if signing is not 1346 * required (enabled but not negotiated), in those cases we selectively 1347 * sign just this, the first and only signed request on a connection. 1348 * Having validation of negotiate info helps reduce attack vectors. 1349 */ 1350 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) 1351 return 0; /* validation requires signing */ 1352 1353 if (tcon->ses->user_name == NULL) { 1354 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n"); 1355 return 0; /* validation requires signing */ 1356 } 1357 1358 if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL) 1359 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n"); 1360 1361 pneg_inbuf = kmalloc_obj(*pneg_inbuf, GFP_NOFS); 1362 if (!pneg_inbuf) 1363 return -ENOMEM; 1364 1365 pneg_inbuf->Capabilities = 1366 cpu_to_le32(server->vals->req_capabilities); 1367 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL); 1368 1369 memcpy(pneg_inbuf->Guid, server->client_guid, 1370 SMB2_CLIENT_GUID_SIZE); 1371 1372 if (tcon->ses->sign) 1373 pneg_inbuf->SecurityMode = 1374 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); 1375 else if (global_secflags & CIFSSEC_MAY_SIGN) 1376 pneg_inbuf->SecurityMode = 1377 cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); 1378 else 1379 pneg_inbuf->SecurityMode = 0; 1380 1381 1382 if (strcmp(server->vals->version_string, 1383 SMB3ANY_VERSION_STRING) == 0) { 1384 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); 1385 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); 1386 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID); 1387 pneg_inbuf->DialectCount = cpu_to_le16(3); 1388 /* SMB 2.1 not included so subtract one dialect from len */ 1389 inbuflen = sizeof(*pneg_inbuf) - 1390 (sizeof(pneg_inbuf->Dialects[0])); 1391 } else if (strcmp(server->vals->version_string, 1392 SMBDEFAULT_VERSION_STRING) == 0) { 1393 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); 1394 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); 1395 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); 1396 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID); 1397 pneg_inbuf->DialectCount = cpu_to_le16(4); 1398 /* structure is big enough for 4 dialects */ 1399 inbuflen = sizeof(*pneg_inbuf); 1400 } else { 1401 /* otherwise specific dialect was requested */ 1402 pneg_inbuf->Dialects[0] = 1403 cpu_to_le16(server->vals->protocol_id); 1404 pneg_inbuf->DialectCount = cpu_to_le16(1); 1405 /* structure is big enough for 4 dialects, sending only 1 */ 1406 inbuflen = sizeof(*pneg_inbuf) - 1407 sizeof(pneg_inbuf->Dialects[0]) * 3; 1408 } 1409 1410 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, 1411 FSCTL_VALIDATE_NEGOTIATE_INFO, 1412 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize, 1413 (char **)&pneg_rsp, &rsplen); 1414 if (rc == -EOPNOTSUPP) { 1415 /* 1416 * Old Windows versions or Netapp SMB server can return 1417 * not supported error. Client should accept it. 1418 */ 1419 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n"); 1420 rc = 0; 1421 goto out_free_inbuf; 1422 } else if (rc != 0) { 1423 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n", 1424 rc); 1425 rc = smb_EIO1(smb_eio_trace_neg_info_fail, rc); 1426 goto out_free_inbuf; 1427 } 1428 1429 if (rsplen != sizeof(*pneg_rsp)) { 1430 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n", 1431 rsplen); 1432 1433 /* relax check since Mac returns max bufsize allowed on ioctl */ 1434 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp)) { 1435 rc = smb_EIO1(smb_eio_trace_neg_bad_rsplen, rsplen); 1436 goto out_free_rsp; 1437 } 1438 } 1439 1440 /* check validate negotiate info response matches what we got earlier */ 1441 u16 dialect = le16_to_cpu(pneg_rsp->Dialect); 1442 1443 if (dialect != server->dialect) { 1444 rc = smb_EIO2(smb_eio_trace_neg_info_dialect, 1445 dialect, server->dialect); 1446 goto vneg_out; 1447 } 1448 1449 u16 sec_mode = le16_to_cpu(pneg_rsp->SecurityMode); 1450 1451 if (sec_mode != server->sec_mode) { 1452 rc = smb_EIO2(smb_eio_trace_neg_info_sec_mode, 1453 sec_mode, server->sec_mode); 1454 goto vneg_out; 1455 } 1456 1457 /* do not validate server guid because not saved at negprot time yet */ 1458 u32 caps = le32_to_cpu(pneg_rsp->Capabilities); 1459 1460 if ((caps | SMB2_NT_FIND | 1461 SMB2_LARGE_FILES) != server->capabilities) { 1462 rc = smb_EIO2(smb_eio_trace_neg_info_caps, 1463 caps, server->capabilities); 1464 goto vneg_out; 1465 } 1466 1467 /* validate negotiate successful */ 1468 rc = 0; 1469 cifs_dbg(FYI, "validate negotiate info successful\n"); 1470 goto out_free_rsp; 1471 1472 vneg_out: 1473 cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n"); 1474 out_free_rsp: 1475 kfree(pneg_rsp); 1476 out_free_inbuf: 1477 kfree(pneg_inbuf); 1478 return rc; 1479 } 1480 1481 enum securityEnum 1482 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) 1483 { 1484 switch (requested) { 1485 case Kerberos: 1486 case RawNTLMSSP: 1487 return requested; 1488 case NTLMv2: 1489 return RawNTLMSSP; 1490 case Unspecified: 1491 if (server->sec_ntlmssp && 1492 (global_secflags & CIFSSEC_MAY_NTLMSSP)) 1493 return RawNTLMSSP; 1494 if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) && 1495 (global_secflags & CIFSSEC_MAY_KRB5)) 1496 return Kerberos; 1497 fallthrough; 1498 default: 1499 return Unspecified; 1500 } 1501 } 1502 1503 struct SMB2_sess_data { 1504 unsigned int xid; 1505 struct cifs_ses *ses; 1506 struct TCP_Server_Info *server; 1507 struct nls_table *nls_cp; 1508 void (*func)(struct SMB2_sess_data *); 1509 int result; 1510 u64 previous_session; 1511 1512 /* we will send the SMB in three pieces: 1513 * a fixed length beginning part, an optional 1514 * SPNEGO blob (which can be zero length), and a 1515 * last part which will include the strings 1516 * and rest of bcc area. This allows us to avoid 1517 * a large buffer 17K allocation 1518 */ 1519 int buf0_type; 1520 struct kvec iov[2]; 1521 }; 1522 1523 static int 1524 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data) 1525 { 1526 int rc; 1527 struct cifs_ses *ses = sess_data->ses; 1528 struct TCP_Server_Info *server = sess_data->server; 1529 struct smb2_sess_setup_req *req; 1530 unsigned int total_len; 1531 bool is_binding = false; 1532 1533 rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server, 1534 (void **) &req, 1535 &total_len); 1536 if (rc) 1537 return rc; 1538 1539 spin_lock(&ses->ses_lock); 1540 is_binding = (ses->ses_status == SES_GOOD); 1541 spin_unlock(&ses->ses_lock); 1542 1543 if (is_binding) { 1544 req->hdr.SessionId = cpu_to_le64(ses->Suid); 1545 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 1546 req->PreviousSessionId = 0; 1547 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING; 1548 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid); 1549 } else { 1550 /* First session, not a reauthenticate */ 1551 req->hdr.SessionId = 0; 1552 /* 1553 * if reconnect, we need to send previous sess id 1554 * otherwise it is 0 1555 */ 1556 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session); 1557 req->Flags = 0; /* MBZ */ 1558 cifs_dbg(FYI, "Fresh session. Previous: %llx\n", 1559 sess_data->previous_session); 1560 } 1561 1562 /* enough to enable echos and oplocks and one max size write */ 1563 if (server->credits >= server->max_credits) 1564 req->hdr.CreditRequest = cpu_to_le16(0); 1565 else 1566 req->hdr.CreditRequest = cpu_to_le16( 1567 min_t(int, server->max_credits - 1568 server->credits, 130)); 1569 1570 /* only one of SMB2 signing flags may be set in SMB2 request */ 1571 if (server->sign) 1572 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED; 1573 else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */ 1574 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED; 1575 else 1576 req->SecurityMode = 0; 1577 1578 #ifdef CONFIG_CIFS_DFS_UPCALL 1579 req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS); 1580 #else 1581 req->Capabilities = 0; 1582 #endif /* DFS_UPCALL */ 1583 1584 req->Channel = 0; /* MBZ */ 1585 1586 sess_data->iov[0].iov_base = (char *)req; 1587 /* 1 for pad */ 1588 sess_data->iov[0].iov_len = total_len - 1; 1589 /* 1590 * This variable will be used to clear the buffer 1591 * allocated above in case of any error in the calling function. 1592 */ 1593 sess_data->buf0_type = CIFS_SMALL_BUFFER; 1594 1595 return 0; 1596 } 1597 1598 static void 1599 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data) 1600 { 1601 struct kvec *iov = sess_data->iov; 1602 1603 /* iov[1] is already freed by caller */ 1604 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base) 1605 memzero_explicit(iov[0].iov_base, iov[0].iov_len); 1606 1607 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base); 1608 sess_data->buf0_type = CIFS_NO_BUFFER; 1609 } 1610 1611 static int 1612 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data) 1613 { 1614 int rc; 1615 struct smb_rqst rqst; 1616 struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base; 1617 struct kvec rsp_iov = { NULL, 0 }; 1618 1619 /* Testing shows that buffer offset must be at location of Buffer[0] */ 1620 req->SecurityBufferOffset = 1621 cpu_to_le16(sizeof(struct smb2_sess_setup_req)); 1622 req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len); 1623 1624 memset(&rqst, 0, sizeof(struct smb_rqst)); 1625 rqst.rq_iov = sess_data->iov; 1626 rqst.rq_nvec = 2; 1627 1628 /* BB add code to build os and lm fields */ 1629 rc = cifs_send_recv(sess_data->xid, sess_data->ses, 1630 sess_data->server, 1631 &rqst, 1632 &sess_data->buf0_type, 1633 CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov); 1634 cifs_small_buf_release(sess_data->iov[0].iov_base); 1635 if (rc == 0) 1636 sess_data->ses->expired_pwd = false; 1637 else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) { 1638 if (sess_data->ses->expired_pwd == false) 1639 trace_smb3_key_expired(sess_data->server->hostname, 1640 sess_data->ses->user_name, 1641 sess_data->server->conn_id, 1642 &sess_data->server->dstaddr, rc); 1643 sess_data->ses->expired_pwd = true; 1644 } 1645 1646 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec)); 1647 1648 return rc; 1649 } 1650 1651 static int 1652 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data) 1653 { 1654 int rc = 0; 1655 struct cifs_ses *ses = sess_data->ses; 1656 struct TCP_Server_Info *server = sess_data->server; 1657 1658 cifs_server_lock(server); 1659 if (server->ops->generate_signingkey) { 1660 rc = server->ops->generate_signingkey(ses, server); 1661 if (rc) { 1662 cifs_dbg(FYI, 1663 "SMB3 session key generation failed\n"); 1664 cifs_server_unlock(server); 1665 return rc; 1666 } 1667 } 1668 if (!server->session_estab) { 1669 server->sequence_number = 0x2; 1670 server->session_estab = true; 1671 } 1672 cifs_server_unlock(server); 1673 1674 cifs_dbg(FYI, "SMB2/3 session established successfully\n"); 1675 return rc; 1676 } 1677 1678 #ifdef CONFIG_CIFS_UPCALL 1679 static void 1680 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) 1681 { 1682 int rc; 1683 struct cifs_ses *ses = sess_data->ses; 1684 struct TCP_Server_Info *server = sess_data->server; 1685 struct cifs_spnego_msg *msg; 1686 struct key *spnego_key = NULL; 1687 struct smb2_sess_setup_rsp *rsp = NULL; 1688 bool is_binding = false; 1689 1690 rc = SMB2_sess_alloc_buffer(sess_data); 1691 if (rc) 1692 goto out; 1693 1694 spnego_key = cifs_get_spnego_key(ses, server); 1695 if (IS_ERR(spnego_key)) { 1696 rc = PTR_ERR(spnego_key); 1697 spnego_key = NULL; 1698 goto out; 1699 } 1700 1701 msg = spnego_key->payload.data[0]; 1702 /* 1703 * check version field to make sure that cifs.upcall is 1704 * sending us a response in an expected form 1705 */ 1706 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { 1707 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n", 1708 CIFS_SPNEGO_UPCALL_VERSION, msg->version); 1709 rc = -EKEYREJECTED; 1710 goto out_put_spnego_key; 1711 } 1712 1713 spin_lock(&ses->ses_lock); 1714 is_binding = (ses->ses_status == SES_GOOD); 1715 spin_unlock(&ses->ses_lock); 1716 1717 kfree_sensitive(ses->auth_key.response); 1718 ses->auth_key.response = kmemdup(msg->data, 1719 msg->sesskey_len, 1720 GFP_KERNEL); 1721 if (!ses->auth_key.response) { 1722 cifs_dbg(VFS, "%s: can't allocate (%u bytes) memory\n", 1723 __func__, msg->sesskey_len); 1724 rc = -ENOMEM; 1725 goto out_put_spnego_key; 1726 } 1727 ses->auth_key.len = msg->sesskey_len; 1728 1729 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; 1730 sess_data->iov[1].iov_len = msg->secblob_len; 1731 1732 rc = SMB2_sess_sendreceive(sess_data); 1733 if (rc) 1734 goto out_put_spnego_key; 1735 1736 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; 1737 /* keep session id and flags if binding */ 1738 if (!is_binding) { 1739 ses->Suid = le64_to_cpu(rsp->hdr.SessionId); 1740 ses->session_flags = le16_to_cpu(rsp->SessionFlags); 1741 } 1742 1743 rc = SMB2_sess_establish_session(sess_data); 1744 out_put_spnego_key: 1745 key_invalidate(spnego_key); 1746 key_put(spnego_key); 1747 if (rc) { 1748 kfree_sensitive(ses->auth_key.response); 1749 ses->auth_key.response = NULL; 1750 ses->auth_key.len = 0; 1751 } 1752 out: 1753 sess_data->result = rc; 1754 sess_data->func = NULL; 1755 SMB2_sess_free_buffer(sess_data); 1756 } 1757 #else 1758 static void 1759 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) 1760 { 1761 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); 1762 sess_data->result = -EOPNOTSUPP; 1763 sess_data->func = NULL; 1764 } 1765 #endif 1766 1767 static void 1768 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data); 1769 1770 static void 1771 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data) 1772 { 1773 int rc; 1774 struct cifs_ses *ses = sess_data->ses; 1775 struct TCP_Server_Info *server = sess_data->server; 1776 struct smb2_sess_setup_rsp *rsp = NULL; 1777 unsigned char *ntlmssp_blob = NULL; 1778 bool use_spnego = false; /* else use raw ntlmssp */ 1779 u16 blob_length = 0; 1780 bool is_binding = false; 1781 1782 /* 1783 * If memory allocation is successful, caller of this function 1784 * frees it. 1785 */ 1786 ses->ntlmssp = kmalloc_obj(struct ntlmssp_auth); 1787 if (!ses->ntlmssp) { 1788 rc = -ENOMEM; 1789 goto out_err; 1790 } 1791 ses->ntlmssp->sesskey_per_smbsess = true; 1792 1793 rc = SMB2_sess_alloc_buffer(sess_data); 1794 if (rc) 1795 goto out_err; 1796 1797 rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob, 1798 &blob_length, ses, server, 1799 sess_data->nls_cp); 1800 if (rc) 1801 goto out; 1802 1803 if (use_spnego) { 1804 /* BB eventually need to add this */ 1805 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); 1806 rc = -EOPNOTSUPP; 1807 goto out; 1808 } 1809 sess_data->iov[1].iov_base = ntlmssp_blob; 1810 sess_data->iov[1].iov_len = blob_length; 1811 1812 rc = SMB2_sess_sendreceive(sess_data); 1813 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; 1814 1815 /* If true, rc here is expected and not an error */ 1816 if (sess_data->buf0_type != CIFS_NO_BUFFER && 1817 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) 1818 rc = 0; 1819 1820 if (rc) 1821 goto out; 1822 1823 u16 boff = le16_to_cpu(rsp->SecurityBufferOffset); 1824 1825 if (offsetof(struct smb2_sess_setup_rsp, Buffer) != boff) { 1826 cifs_dbg(VFS, "Invalid security buffer offset %d\n", boff); 1827 rc = smb_EIO1(smb_eio_trace_sess_buf_off, boff); 1828 goto out; 1829 } 1830 rc = decode_ntlmssp_challenge(rsp->Buffer, 1831 le16_to_cpu(rsp->SecurityBufferLength), ses); 1832 if (rc) 1833 goto out; 1834 1835 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); 1836 1837 spin_lock(&ses->ses_lock); 1838 is_binding = (ses->ses_status == SES_GOOD); 1839 spin_unlock(&ses->ses_lock); 1840 1841 /* keep existing ses id and flags if binding */ 1842 if (!is_binding) { 1843 ses->Suid = le64_to_cpu(rsp->hdr.SessionId); 1844 ses->session_flags = le16_to_cpu(rsp->SessionFlags); 1845 } 1846 1847 out: 1848 kfree_sensitive(ntlmssp_blob); 1849 SMB2_sess_free_buffer(sess_data); 1850 if (!rc) { 1851 sess_data->result = 0; 1852 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate; 1853 return; 1854 } 1855 out_err: 1856 kfree_sensitive(ses->ntlmssp); 1857 ses->ntlmssp = NULL; 1858 sess_data->result = rc; 1859 sess_data->func = NULL; 1860 } 1861 1862 static void 1863 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data) 1864 { 1865 int rc; 1866 struct cifs_ses *ses = sess_data->ses; 1867 struct TCP_Server_Info *server = sess_data->server; 1868 struct smb2_sess_setup_req *req; 1869 struct smb2_sess_setup_rsp *rsp = NULL; 1870 unsigned char *ntlmssp_blob = NULL; 1871 bool use_spnego = false; /* else use raw ntlmssp */ 1872 u16 blob_length = 0; 1873 bool is_binding = false; 1874 1875 rc = SMB2_sess_alloc_buffer(sess_data); 1876 if (rc) 1877 goto out; 1878 1879 req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base; 1880 req->hdr.SessionId = cpu_to_le64(ses->Suid); 1881 1882 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, 1883 ses, server, 1884 sess_data->nls_cp); 1885 if (rc) { 1886 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc); 1887 goto out; 1888 } 1889 1890 if (use_spnego) { 1891 /* BB eventually need to add this */ 1892 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); 1893 rc = -EOPNOTSUPP; 1894 goto out; 1895 } 1896 sess_data->iov[1].iov_base = ntlmssp_blob; 1897 sess_data->iov[1].iov_len = blob_length; 1898 1899 rc = SMB2_sess_sendreceive(sess_data); 1900 if (rc) 1901 goto out; 1902 1903 rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; 1904 1905 spin_lock(&ses->ses_lock); 1906 is_binding = (ses->ses_status == SES_GOOD); 1907 spin_unlock(&ses->ses_lock); 1908 1909 /* keep existing ses id and flags if binding */ 1910 if (!is_binding) { 1911 ses->Suid = le64_to_cpu(rsp->hdr.SessionId); 1912 ses->session_flags = le16_to_cpu(rsp->SessionFlags); 1913 } 1914 1915 rc = SMB2_sess_establish_session(sess_data); 1916 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS 1917 if (ses->server->dialect < SMB30_PROT_ID) { 1918 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__); 1919 /* 1920 * The session id is opaque in terms of endianness, so we can't 1921 * print it as a long long. we dump it as we got it on the wire 1922 */ 1923 cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid), 1924 &ses->Suid); 1925 cifs_dbg(VFS, "Session Key %*ph\n", 1926 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response); 1927 cifs_dbg(VFS, "Signing Key %*ph\n", 1928 SMB3_SIGN_KEY_SIZE, ses->auth_key.response); 1929 } 1930 #endif 1931 out: 1932 kfree_sensitive(ntlmssp_blob); 1933 SMB2_sess_free_buffer(sess_data); 1934 kfree_sensitive(ses->ntlmssp); 1935 ses->ntlmssp = NULL; 1936 sess_data->result = rc; 1937 sess_data->func = NULL; 1938 } 1939 1940 static int 1941 SMB2_select_sec(struct SMB2_sess_data *sess_data) 1942 { 1943 int type; 1944 struct cifs_ses *ses = sess_data->ses; 1945 struct TCP_Server_Info *server = sess_data->server; 1946 1947 type = smb2_select_sectype(server, ses->sectype); 1948 cifs_dbg(FYI, "sess setup type %d\n", type); 1949 if (type == Unspecified) { 1950 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n"); 1951 return -EINVAL; 1952 } 1953 1954 switch (type) { 1955 case Kerberos: 1956 sess_data->func = SMB2_auth_kerberos; 1957 break; 1958 case RawNTLMSSP: 1959 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate; 1960 break; 1961 default: 1962 cifs_dbg(VFS, "secType %d not supported!\n", type); 1963 return -EOPNOTSUPP; 1964 } 1965 1966 return 0; 1967 } 1968 1969 int 1970 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses, 1971 struct TCP_Server_Info *server, 1972 const struct nls_table *nls_cp) 1973 { 1974 int rc = 0; 1975 struct SMB2_sess_data *sess_data; 1976 1977 cifs_dbg(FYI, "Session Setup\n"); 1978 1979 if (!server) { 1980 WARN(1, "%s: server is NULL!\n", __func__); 1981 return smb_EIO(smb_eio_trace_null_pointers); 1982 } 1983 1984 sess_data = kzalloc_obj(struct SMB2_sess_data); 1985 if (!sess_data) 1986 return -ENOMEM; 1987 1988 sess_data->xid = xid; 1989 sess_data->ses = ses; 1990 sess_data->server = server; 1991 sess_data->buf0_type = CIFS_NO_BUFFER; 1992 sess_data->nls_cp = (struct nls_table *) nls_cp; 1993 sess_data->previous_session = ses->Suid; 1994 1995 rc = SMB2_select_sec(sess_data); 1996 if (rc) 1997 goto out; 1998 1999 /* 2000 * Initialize the session hash with the server one. 2001 */ 2002 memcpy(ses->preauth_sha_hash, server->preauth_sha_hash, 2003 SMB2_PREAUTH_HASH_SIZE); 2004 2005 while (sess_data->func) 2006 sess_data->func(sess_data); 2007 2008 if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign)) 2009 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n"); 2010 rc = sess_data->result; 2011 out: 2012 kfree_sensitive(sess_data); 2013 return rc; 2014 } 2015 2016 int 2017 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses) 2018 { 2019 struct smb_rqst rqst; 2020 struct smb2_logoff_req *req; /* response is also trivial struct */ 2021 int rc = 0; 2022 struct TCP_Server_Info *server; 2023 int flags = 0; 2024 unsigned int total_len; 2025 struct kvec iov[1]; 2026 struct kvec rsp_iov; 2027 int resp_buf_type; 2028 2029 cifs_dbg(FYI, "disconnect session %p\n", ses); 2030 2031 if (!ses || !ses->server) 2032 return smb_EIO(smb_eio_trace_null_pointers); 2033 server = ses->server; 2034 2035 /* no need to send SMB logoff if uid already closed due to reconnect */ 2036 spin_lock(&ses->chan_lock); 2037 if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) { 2038 spin_unlock(&ses->chan_lock); 2039 goto smb2_session_already_dead; 2040 } 2041 spin_unlock(&ses->chan_lock); 2042 2043 rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server, 2044 (void **) &req, &total_len); 2045 if (rc) 2046 return rc; 2047 2048 /* since no tcon, smb2_init can not do this, so do here */ 2049 req->hdr.SessionId = cpu_to_le64(ses->Suid); 2050 2051 if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) 2052 flags |= CIFS_TRANSFORM_REQ; 2053 else if (server->sign) 2054 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 2055 2056 flags |= CIFS_NO_RSP_BUF; 2057 2058 iov[0].iov_base = (char *)req; 2059 iov[0].iov_len = total_len; 2060 2061 memset(&rqst, 0, sizeof(struct smb_rqst)); 2062 rqst.rq_iov = iov; 2063 rqst.rq_nvec = 1; 2064 2065 rc = cifs_send_recv(xid, ses, ses->server, 2066 &rqst, &resp_buf_type, flags, &rsp_iov); 2067 cifs_small_buf_release(req); 2068 /* 2069 * No tcon so can't do 2070 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); 2071 */ 2072 2073 smb2_session_already_dead: 2074 return rc; 2075 } 2076 2077 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code) 2078 { 2079 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]); 2080 } 2081 2082 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */) 2083 2084 /* These are similar values to what Windows uses */ 2085 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon) 2086 { 2087 tcon->max_chunks = 256; 2088 tcon->max_bytes_chunk = 1048576; 2089 tcon->max_bytes_copy = 16777216; 2090 } 2091 2092 int 2093 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree, 2094 struct cifs_tcon *tcon, const struct nls_table *cp) 2095 { 2096 struct smb_rqst rqst; 2097 struct smb2_tree_connect_req *req; 2098 struct smb2_tree_connect_rsp *rsp = NULL; 2099 struct kvec iov[2]; 2100 struct kvec rsp_iov = { NULL, 0 }; 2101 int rc = 0; 2102 int resp_buftype; 2103 int unc_path_len; 2104 __le16 *unc_path = NULL; 2105 int flags = 0; 2106 unsigned int total_len; 2107 struct TCP_Server_Info *server = cifs_pick_channel(ses); 2108 2109 cifs_dbg(FYI, "TCON\n"); 2110 2111 if (!server || !tree) 2112 return smb_EIO(smb_eio_trace_null_pointers); 2113 2114 unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL); 2115 if (unc_path == NULL) 2116 return -ENOMEM; 2117 2118 unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp); 2119 if (unc_path_len <= 0) { 2120 kfree(unc_path); 2121 return -EINVAL; 2122 } 2123 unc_path_len *= 2; 2124 2125 /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */ 2126 tcon->tid = 0; 2127 atomic_set(&tcon->num_remote_opens, 0); 2128 rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server, 2129 (void **) &req, &total_len); 2130 if (rc) { 2131 kfree(unc_path); 2132 return rc; 2133 } 2134 2135 if (smb3_encryption_required(tcon)) 2136 flags |= CIFS_TRANSFORM_REQ; 2137 2138 iov[0].iov_base = (char *)req; 2139 /* 1 for pad */ 2140 iov[0].iov_len = total_len - 1; 2141 2142 /* Testing shows that buffer offset must be at location of Buffer[0] */ 2143 req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)); 2144 req->PathLength = cpu_to_le16(unc_path_len); 2145 iov[1].iov_base = unc_path; 2146 iov[1].iov_len = unc_path_len; 2147 2148 /* 2149 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 2150 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1 2151 * (Samba servers don't always set the flag so also check if null user) 2152 */ 2153 if ((server->dialect == SMB311_PROT_ID) && 2154 !smb3_encryption_required(tcon) && 2155 !(ses->session_flags & 2156 (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) && 2157 ((ses->user_name != NULL) || (ses->sectype == Kerberos))) 2158 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 2159 2160 memset(&rqst, 0, sizeof(struct smb_rqst)); 2161 rqst.rq_iov = iov; 2162 rqst.rq_nvec = 2; 2163 2164 /* Need 64 for max size write so ask for more in case not there yet */ 2165 if (server->credits >= server->max_credits) 2166 req->hdr.CreditRequest = cpu_to_le16(0); 2167 else 2168 req->hdr.CreditRequest = cpu_to_le16( 2169 min_t(int, server->max_credits - 2170 server->credits, 64)); 2171 2172 rc = cifs_send_recv(xid, ses, server, 2173 &rqst, &resp_buftype, flags, &rsp_iov); 2174 cifs_small_buf_release(req); 2175 rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base; 2176 trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc); 2177 if ((rc != 0) || (rsp == NULL)) { 2178 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE); 2179 tcon->need_reconnect = true; 2180 goto tcon_error_exit; 2181 } 2182 2183 switch (rsp->ShareType) { 2184 case SMB2_SHARE_TYPE_DISK: 2185 cifs_dbg(FYI, "connection to disk share\n"); 2186 break; 2187 case SMB2_SHARE_TYPE_PIPE: 2188 tcon->pipe = true; 2189 cifs_dbg(FYI, "connection to pipe share\n"); 2190 break; 2191 case SMB2_SHARE_TYPE_PRINT: 2192 tcon->print = true; 2193 cifs_dbg(FYI, "connection to printer\n"); 2194 break; 2195 default: 2196 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType); 2197 rc = -EOPNOTSUPP; 2198 goto tcon_error_exit; 2199 } 2200 2201 tcon->share_flags = le32_to_cpu(rsp->ShareFlags); 2202 tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */ 2203 tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess); 2204 tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId); 2205 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name)); 2206 2207 if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) && 2208 ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0)) 2209 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n"); 2210 2211 if (tcon->seal && 2212 !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) 2213 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n"); 2214 2215 init_copy_chunk_defaults(tcon); 2216 if (server->ops->validate_negotiate) 2217 rc = server->ops->validate_negotiate(xid, tcon); 2218 if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */ 2219 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT) 2220 server->nosharesock = true; 2221 tcon_exit: 2222 2223 free_rsp_buf(resp_buftype, rsp); 2224 kfree(unc_path); 2225 return rc; 2226 2227 tcon_error_exit: 2228 if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) 2229 cifs_dbg(VFS | ONCE, "BAD_NETWORK_NAME: %s\n", tree); 2230 goto tcon_exit; 2231 } 2232 2233 int 2234 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon) 2235 { 2236 struct smb_rqst rqst; 2237 struct smb2_tree_disconnect_req *req; /* response is trivial */ 2238 int rc = 0; 2239 struct cifs_ses *ses = tcon->ses; 2240 struct TCP_Server_Info *server = cifs_pick_channel(ses); 2241 int flags = 0; 2242 unsigned int total_len; 2243 struct kvec iov[1]; 2244 struct kvec rsp_iov; 2245 int resp_buf_type; 2246 2247 cifs_dbg(FYI, "Tree Disconnect\n"); 2248 2249 if (!ses || !(ses->server)) 2250 return smb_EIO(smb_eio_trace_null_pointers); 2251 2252 trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name); 2253 spin_lock(&ses->chan_lock); 2254 if ((tcon->need_reconnect) || 2255 (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) { 2256 spin_unlock(&ses->chan_lock); 2257 return 0; 2258 } 2259 spin_unlock(&ses->chan_lock); 2260 2261 invalidate_all_cached_dirs(tcon); 2262 2263 rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server, 2264 (void **) &req, 2265 &total_len); 2266 if (rc) 2267 return rc; 2268 2269 if (smb3_encryption_required(tcon)) 2270 flags |= CIFS_TRANSFORM_REQ; 2271 2272 flags |= CIFS_NO_RSP_BUF; 2273 2274 iov[0].iov_base = (char *)req; 2275 iov[0].iov_len = total_len; 2276 2277 memset(&rqst, 0, sizeof(struct smb_rqst)); 2278 rqst.rq_iov = iov; 2279 rqst.rq_nvec = 1; 2280 2281 rc = cifs_send_recv(xid, ses, server, 2282 &rqst, &resp_buf_type, flags, &rsp_iov); 2283 cifs_small_buf_release(req); 2284 if (rc) { 2285 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE); 2286 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc); 2287 } 2288 trace_smb3_tdis_done(xid, tcon->tid, ses->Suid); 2289 2290 return rc; 2291 } 2292 2293 static create_durable_req_t * 2294 create_durable_buf(void) 2295 { 2296 create_durable_req_t *buf; 2297 2298 buf = kzalloc_obj(create_durable_req_t); 2299 if (!buf) 2300 return NULL; 2301 2302 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2303 (create_durable_req_t, Data)); 2304 buf->ccontext.DataLength = cpu_to_le32(16); 2305 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2306 (create_durable_req_t, Name)); 2307 buf->ccontext.NameLength = cpu_to_le16(4); 2308 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */ 2309 buf->Name[0] = 'D'; 2310 buf->Name[1] = 'H'; 2311 buf->Name[2] = 'n'; 2312 buf->Name[3] = 'Q'; 2313 return buf; 2314 } 2315 2316 static create_durable_req_t * 2317 create_reconnect_durable_buf(struct cifs_fid *fid) 2318 { 2319 create_durable_req_t *buf; 2320 2321 buf = kzalloc_obj(create_durable_req_t); 2322 if (!buf) 2323 return NULL; 2324 2325 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2326 (create_durable_req_t, Data)); 2327 buf->ccontext.DataLength = cpu_to_le32(16); 2328 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2329 (create_durable_req_t, Name)); 2330 buf->ccontext.NameLength = cpu_to_le16(4); 2331 buf->Data.Fid.PersistentFileId = fid->persistent_fid; 2332 buf->Data.Fid.VolatileFileId = fid->volatile_fid; 2333 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */ 2334 buf->Name[0] = 'D'; 2335 buf->Name[1] = 'H'; 2336 buf->Name[2] = 'n'; 2337 buf->Name[3] = 'C'; 2338 return buf; 2339 } 2340 2341 static void 2342 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf) 2343 { 2344 struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc; 2345 2346 cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n", 2347 pdisk_id->DiskFileId, pdisk_id->VolumeId); 2348 buf->IndexNumber = pdisk_id->DiskFileId; 2349 } 2350 2351 static void 2352 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info, 2353 struct create_posix_rsp *posix) 2354 { 2355 int sid_len; 2356 u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset); 2357 u8 *end = beg + le32_to_cpu(cc->DataLength); 2358 u8 *sid; 2359 2360 memset(posix, 0, sizeof(*posix)); 2361 2362 posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0)); 2363 posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4)); 2364 posix->mode = le32_to_cpu(*(__le32 *)(beg + 8)); 2365 2366 sid = beg + 12; 2367 sid_len = posix_info_sid_size(sid, end); 2368 if (sid_len < 0) { 2369 cifs_dbg(VFS, "bad owner sid in posix create response\n"); 2370 return; 2371 } 2372 memcpy(&posix->owner, sid, sid_len); 2373 2374 sid = sid + sid_len; 2375 sid_len = posix_info_sid_size(sid, end); 2376 if (sid_len < 0) { 2377 cifs_dbg(VFS, "bad group sid in posix create response\n"); 2378 return; 2379 } 2380 memcpy(&posix->group, sid, sid_len); 2381 2382 cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n", 2383 posix->nlink, posix->mode, posix->reparse_tag); 2384 } 2385 2386 int smb2_parse_contexts(struct TCP_Server_Info *server, 2387 struct kvec *rsp_iov, 2388 __u16 *epoch, 2389 char *lease_key, __u8 *oplock, 2390 struct smb2_file_all_info *buf, 2391 struct create_posix_rsp *posix) 2392 { 2393 struct smb2_create_rsp *rsp = rsp_iov->iov_base; 2394 struct create_context *cc; 2395 size_t rem, off, len; 2396 size_t doff, dlen; 2397 size_t noff, nlen; 2398 char *name; 2399 static const char smb3_create_tag_posix[] = { 2400 0x93, 0xAD, 0x25, 0x50, 0x9C, 2401 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83, 2402 0xDE, 0x96, 0x8B, 0xCD, 0x7C 2403 }; 2404 2405 *oplock = 0; 2406 2407 off = le32_to_cpu(rsp->CreateContextsOffset); 2408 rem = le32_to_cpu(rsp->CreateContextsLength); 2409 if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len) 2410 return -EINVAL; 2411 cc = (struct create_context *)((u8 *)rsp + off); 2412 2413 /* Initialize inode number to 0 in case no valid data in qfid context */ 2414 if (buf) 2415 buf->IndexNumber = 0; 2416 2417 while (rem >= sizeof(*cc)) { 2418 doff = le16_to_cpu(cc->DataOffset); 2419 dlen = le32_to_cpu(cc->DataLength); 2420 if (check_add_overflow(doff, dlen, &len) || len > rem) 2421 return -EINVAL; 2422 2423 noff = le16_to_cpu(cc->NameOffset); 2424 nlen = le16_to_cpu(cc->NameLength); 2425 if (noff + nlen > doff) 2426 return -EINVAL; 2427 2428 name = (char *)cc + noff; 2429 switch (nlen) { 2430 case 4: 2431 if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) { 2432 *oplock = server->ops->parse_lease_buf(cc, epoch, 2433 lease_key); 2434 } else if (buf && 2435 !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) { 2436 parse_query_id_ctxt(cc, buf); 2437 } 2438 break; 2439 case 16: 2440 if (posix && !memcmp(name, smb3_create_tag_posix, 16)) 2441 parse_posix_ctxt(cc, buf, posix); 2442 break; 2443 default: 2444 cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n", 2445 __func__, nlen, dlen); 2446 if (IS_ENABLED(CONFIG_CIFS_DEBUG2)) 2447 cifs_dump_mem("context data: ", cc, dlen); 2448 break; 2449 } 2450 2451 off = le32_to_cpu(cc->Next); 2452 if (!off) 2453 break; 2454 if (check_sub_overflow(rem, off, &rem)) 2455 return -EINVAL; 2456 cc = (struct create_context *)((u8 *)cc + off); 2457 } 2458 2459 if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE) 2460 *oplock = rsp->OplockLevel; 2461 2462 return 0; 2463 } 2464 2465 static int 2466 add_lease_context(struct TCP_Server_Info *server, 2467 struct smb2_create_req *req, 2468 struct kvec *iov, 2469 unsigned int *num_iovec, 2470 u8 *lease_key, 2471 __u8 *oplock, 2472 u8 *parent_lease_key, 2473 __le32 flags) 2474 { 2475 unsigned int num = *num_iovec; 2476 2477 iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock, 2478 parent_lease_key, flags); 2479 if (iov[num].iov_base == NULL) 2480 return -ENOMEM; 2481 iov[num].iov_len = server->vals->create_lease_size; 2482 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE; 2483 *num_iovec = num + 1; 2484 return 0; 2485 } 2486 2487 static struct create_durable_req_v2 * 2488 create_durable_v2_buf(struct cifs_open_parms *oparms) 2489 { 2490 struct cifs_fid *pfid = oparms->fid; 2491 struct create_durable_req_v2 *buf; 2492 2493 buf = kzalloc_obj(struct create_durable_req_v2); 2494 if (!buf) 2495 return NULL; 2496 2497 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2498 (struct create_durable_req_v2, dcontext)); 2499 buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2_req)); 2500 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2501 (struct create_durable_req_v2, Name)); 2502 buf->ccontext.NameLength = cpu_to_le16(4); 2503 2504 /* 2505 * NB: Handle timeout defaults to 0, which allows server to choose 2506 * (most servers default to 120 seconds) and most clients default to 0. 2507 * This can be overridden at mount ("handletimeout=") if the user wants 2508 * a different persistent (or resilient) handle timeout for all opens 2509 * on a particular SMB3 mount. 2510 */ 2511 buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout); 2512 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); 2513 2514 /* for replay, we should not overwrite the existing create guid */ 2515 if (!oparms->replay) { 2516 generate_random_uuid(buf->dcontext.CreateGuid); 2517 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16); 2518 } else 2519 memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16); 2520 2521 /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */ 2522 buf->Name[0] = 'D'; 2523 buf->Name[1] = 'H'; 2524 buf->Name[2] = '2'; 2525 buf->Name[3] = 'Q'; 2526 return buf; 2527 } 2528 2529 static struct create_durable_handle_reconnect_v2 * 2530 create_reconnect_durable_v2_buf(struct cifs_fid *fid) 2531 { 2532 struct create_durable_handle_reconnect_v2 *buf; 2533 2534 buf = kzalloc_obj(struct create_durable_handle_reconnect_v2); 2535 if (!buf) 2536 return NULL; 2537 2538 buf->ccontext.DataOffset = 2539 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, 2540 dcontext)); 2541 buf->ccontext.DataLength = 2542 cpu_to_le32(sizeof(struct durable_reconnect_context_v2)); 2543 buf->ccontext.NameOffset = 2544 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, 2545 Name)); 2546 buf->ccontext.NameLength = cpu_to_le16(4); 2547 2548 buf->dcontext.Fid.PersistentFileId = fid->persistent_fid; 2549 buf->dcontext.Fid.VolatileFileId = fid->volatile_fid; 2550 buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); 2551 memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16); 2552 2553 /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */ 2554 buf->Name[0] = 'D'; 2555 buf->Name[1] = 'H'; 2556 buf->Name[2] = '2'; 2557 buf->Name[3] = 'C'; 2558 return buf; 2559 } 2560 2561 static int 2562 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec, 2563 struct cifs_open_parms *oparms) 2564 { 2565 unsigned int num = *num_iovec; 2566 2567 iov[num].iov_base = create_durable_v2_buf(oparms); 2568 if (iov[num].iov_base == NULL) 2569 return -ENOMEM; 2570 iov[num].iov_len = sizeof(struct create_durable_req_v2); 2571 *num_iovec = num + 1; 2572 return 0; 2573 } 2574 2575 static int 2576 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec, 2577 struct cifs_open_parms *oparms) 2578 { 2579 unsigned int num = *num_iovec; 2580 2581 /* indicate that we don't need to relock the file */ 2582 oparms->reconnect = false; 2583 2584 iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid); 2585 if (iov[num].iov_base == NULL) 2586 return -ENOMEM; 2587 iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2); 2588 *num_iovec = num + 1; 2589 return 0; 2590 } 2591 2592 static int 2593 add_durable_context(struct kvec *iov, unsigned int *num_iovec, 2594 struct cifs_open_parms *oparms, bool use_persistent) 2595 { 2596 unsigned int num = *num_iovec; 2597 2598 if (use_persistent) { 2599 if (oparms->reconnect) 2600 return add_durable_reconnect_v2_context(iov, num_iovec, 2601 oparms); 2602 else 2603 return add_durable_v2_context(iov, num_iovec, oparms); 2604 } 2605 2606 if (oparms->reconnect) { 2607 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid); 2608 /* indicate that we don't need to relock the file */ 2609 oparms->reconnect = false; 2610 } else 2611 iov[num].iov_base = create_durable_buf(); 2612 if (iov[num].iov_base == NULL) 2613 return -ENOMEM; 2614 iov[num].iov_len = sizeof(create_durable_req_t); 2615 *num_iovec = num + 1; 2616 return 0; 2617 } 2618 2619 /* See MS-SMB2 2.2.13.2.7 */ 2620 static struct crt_twarp_ctxt * 2621 create_twarp_buf(__u64 timewarp) 2622 { 2623 struct crt_twarp_ctxt *buf; 2624 2625 buf = kzalloc_obj(struct crt_twarp_ctxt); 2626 if (!buf) 2627 return NULL; 2628 2629 buf->ccontext.DataOffset = cpu_to_le16(offsetof 2630 (struct crt_twarp_ctxt, Timestamp)); 2631 buf->ccontext.DataLength = cpu_to_le32(8); 2632 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2633 (struct crt_twarp_ctxt, Name)); 2634 buf->ccontext.NameLength = cpu_to_le16(4); 2635 /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */ 2636 buf->Name[0] = 'T'; 2637 buf->Name[1] = 'W'; 2638 buf->Name[2] = 'r'; 2639 buf->Name[3] = 'p'; 2640 buf->Timestamp = cpu_to_le64(timewarp); 2641 return buf; 2642 } 2643 2644 /* See MS-SMB2 2.2.13.2.7 */ 2645 static int 2646 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp) 2647 { 2648 unsigned int num = *num_iovec; 2649 2650 iov[num].iov_base = create_twarp_buf(timewarp); 2651 if (iov[num].iov_base == NULL) 2652 return -ENOMEM; 2653 iov[num].iov_len = sizeof(struct crt_twarp_ctxt); 2654 *num_iovec = num + 1; 2655 return 0; 2656 } 2657 2658 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */ 2659 static void setup_owner_group_sids(char *buf) 2660 { 2661 struct owner_group_sids *sids = (struct owner_group_sids *)buf; 2662 2663 /* Populate the user ownership fields S-1-5-88-1 */ 2664 sids->owner.Revision = 1; 2665 sids->owner.NumAuth = 3; 2666 sids->owner.Authority[5] = 5; 2667 sids->owner.SubAuthorities[0] = cpu_to_le32(88); 2668 sids->owner.SubAuthorities[1] = cpu_to_le32(1); 2669 sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val); 2670 2671 /* Populate the group ownership fields S-1-5-88-2 */ 2672 sids->group.Revision = 1; 2673 sids->group.NumAuth = 3; 2674 sids->group.Authority[5] = 5; 2675 sids->group.SubAuthorities[0] = cpu_to_le32(88); 2676 sids->group.SubAuthorities[1] = cpu_to_le32(2); 2677 sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val); 2678 2679 cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val); 2680 } 2681 2682 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */ 2683 static struct crt_sd_ctxt * 2684 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len) 2685 { 2686 struct crt_sd_ctxt *buf; 2687 __u8 *ptr, *aclptr; 2688 unsigned int acelen, acl_size, ace_count; 2689 unsigned int owner_offset = 0; 2690 unsigned int group_offset = 0; 2691 struct smb3_acl acl = {}; 2692 2693 *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct smb_ace) * 4), 8); 2694 2695 if (set_owner) { 2696 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */ 2697 *len += sizeof(struct owner_group_sids); 2698 } 2699 2700 buf = kzalloc(*len, GFP_KERNEL); 2701 if (buf == NULL) 2702 return buf; 2703 2704 ptr = (__u8 *)&buf[1]; 2705 if (set_owner) { 2706 /* offset fields are from beginning of security descriptor not of create context */ 2707 owner_offset = ptr - (__u8 *)&buf->sd; 2708 buf->sd.OffsetOwner = cpu_to_le32(owner_offset); 2709 group_offset = owner_offset + offsetof(struct owner_group_sids, group); 2710 buf->sd.OffsetGroup = cpu_to_le32(group_offset); 2711 2712 setup_owner_group_sids(ptr); 2713 ptr += sizeof(struct owner_group_sids); 2714 } else { 2715 buf->sd.OffsetOwner = 0; 2716 buf->sd.OffsetGroup = 0; 2717 } 2718 2719 buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd)); 2720 buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name)); 2721 buf->ccontext.NameLength = cpu_to_le16(4); 2722 /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */ 2723 buf->Name[0] = 'S'; 2724 buf->Name[1] = 'e'; 2725 buf->Name[2] = 'c'; 2726 buf->Name[3] = 'D'; 2727 buf->sd.Revision = 1; /* Must be one see MS-DTYP 2.4.6 */ 2728 2729 /* 2730 * ACL is "self relative" ie ACL is stored in contiguous block of memory 2731 * and "DP" ie the DACL is present 2732 */ 2733 buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP); 2734 2735 /* offset owner, group and Sbz1 and SACL are all zero */ 2736 buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd); 2737 /* Ship the ACL for now. we will copy it into buf later. */ 2738 aclptr = ptr; 2739 ptr += sizeof(struct smb3_acl); 2740 2741 /* create one ACE to hold the mode embedded in reserved special SID */ 2742 acelen = setup_special_mode_ACE((struct smb_ace *)ptr, false, (__u64)mode); 2743 ptr += acelen; 2744 acl_size = acelen + sizeof(struct smb3_acl); 2745 ace_count = 1; 2746 2747 if (set_owner) { 2748 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */ 2749 acelen = setup_special_user_owner_ACE((struct smb_ace *)ptr); 2750 ptr += acelen; 2751 acl_size += acelen; 2752 ace_count += 1; 2753 } 2754 2755 /* and one more ACE to allow access for authenticated users */ 2756 acelen = setup_authusers_ACE((struct smb_ace *)ptr); 2757 ptr += acelen; 2758 acl_size += acelen; 2759 ace_count += 1; 2760 2761 acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */ 2762 acl.AclSize = cpu_to_le16(acl_size); 2763 acl.AceCount = cpu_to_le16(ace_count); 2764 /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */ 2765 memcpy(aclptr, &acl, sizeof(struct smb3_acl)); 2766 2767 buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd); 2768 *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8); 2769 2770 return buf; 2771 } 2772 2773 static int 2774 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner) 2775 { 2776 unsigned int num = *num_iovec; 2777 unsigned int len = 0; 2778 2779 iov[num].iov_base = create_sd_buf(mode, set_owner, &len); 2780 if (iov[num].iov_base == NULL) 2781 return -ENOMEM; 2782 iov[num].iov_len = len; 2783 *num_iovec = num + 1; 2784 return 0; 2785 } 2786 2787 static struct crt_query_id_ctxt * 2788 create_query_id_buf(void) 2789 { 2790 struct crt_query_id_ctxt *buf; 2791 2792 buf = kzalloc_obj(struct crt_query_id_ctxt); 2793 if (!buf) 2794 return NULL; 2795 2796 buf->ccontext.DataOffset = cpu_to_le16(0); 2797 buf->ccontext.DataLength = cpu_to_le32(0); 2798 buf->ccontext.NameOffset = cpu_to_le16(offsetof 2799 (struct crt_query_id_ctxt, Name)); 2800 buf->ccontext.NameLength = cpu_to_le16(4); 2801 /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */ 2802 buf->Name[0] = 'Q'; 2803 buf->Name[1] = 'F'; 2804 buf->Name[2] = 'i'; 2805 buf->Name[3] = 'd'; 2806 return buf; 2807 } 2808 2809 /* See MS-SMB2 2.2.13.2.9 */ 2810 static int 2811 add_query_id_context(struct kvec *iov, unsigned int *num_iovec) 2812 { 2813 unsigned int num = *num_iovec; 2814 2815 iov[num].iov_base = create_query_id_buf(); 2816 if (iov[num].iov_base == NULL) 2817 return -ENOMEM; 2818 iov[num].iov_len = sizeof(struct crt_query_id_ctxt); 2819 *num_iovec = num + 1; 2820 return 0; 2821 } 2822 2823 static void add_ea_context(struct cifs_open_parms *oparms, 2824 struct kvec *rq_iov, unsigned int *num_iovs) 2825 { 2826 struct kvec *iov = oparms->ea_cctx; 2827 2828 if (iov && iov->iov_base && iov->iov_len) { 2829 rq_iov[(*num_iovs)++] = *iov; 2830 memset(iov, 0, sizeof(*iov)); 2831 } 2832 } 2833 2834 static int 2835 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len, 2836 const char *treename, const __le16 *path) 2837 { 2838 int treename_len, path_len; 2839 struct nls_table *cp; 2840 const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)}; 2841 2842 /* 2843 * skip leading "\\" 2844 */ 2845 treename_len = strlen(treename); 2846 if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\')) 2847 return -EINVAL; 2848 2849 treename += 2; 2850 treename_len -= 2; 2851 2852 path_len = UniStrnlen((wchar_t *)path, PATH_MAX); 2853 2854 /* make room for one path separator only if @path isn't empty */ 2855 *out_len = treename_len + (path[0] ? 1 : 0) + path_len; 2856 2857 /* 2858 * final path needs to be 8-byte aligned as specified in 2859 * MS-SMB2 2.2.13 SMB2 CREATE Request. 2860 */ 2861 *out_size = round_up(*out_len * sizeof(__le16), 8); 2862 *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL); 2863 if (!*out_path) 2864 return -ENOMEM; 2865 2866 cp = load_nls_default(); 2867 cifs_strtoUTF16(*out_path, treename, treename_len, cp); 2868 2869 /* Do not append the separator if the path is empty */ 2870 if (path[0] != cpu_to_le16(0x0000)) { 2871 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep); 2872 UniStrcat((wchar_t *)*out_path, (wchar_t *)path); 2873 } 2874 2875 unload_nls(cp); 2876 2877 return 0; 2878 } 2879 2880 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode, 2881 umode_t mode, struct cifs_tcon *tcon, 2882 const char *full_path, 2883 struct cifs_sb_info *cifs_sb) 2884 { 2885 struct smb_rqst rqst; 2886 struct smb2_create_req *req; 2887 struct smb2_create_rsp *rsp = NULL; 2888 struct cifs_ses *ses = tcon->ses; 2889 struct kvec iov[3]; /* make sure at least one for each open context */ 2890 struct kvec rsp_iov = {NULL, 0}; 2891 int resp_buftype; 2892 int uni_path_len; 2893 __le16 *copy_path = NULL; 2894 int copy_size; 2895 int rc = 0; 2896 unsigned int n_iov = 2; 2897 __u32 file_attributes = 0; 2898 char *pc_buf = NULL; 2899 int flags = 0; 2900 unsigned int total_len; 2901 __le16 *utf16_path = NULL; 2902 struct TCP_Server_Info *server; 2903 int retries = 0, cur_sleep = 0; 2904 2905 replay_again: 2906 /* reinitialize for possible replay */ 2907 pc_buf = NULL; 2908 flags = 0; 2909 n_iov = 2; 2910 server = cifs_pick_channel(ses); 2911 2912 cifs_dbg(FYI, "mkdir\n"); 2913 2914 /* resource #1: path allocation */ 2915 utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb); 2916 if (!utf16_path) 2917 return -ENOMEM; 2918 2919 if (!ses || !server) { 2920 rc = smb_EIO(smb_eio_trace_null_pointers); 2921 goto err_free_path; 2922 } 2923 2924 /* resource #2: request */ 2925 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server, 2926 (void **) &req, &total_len); 2927 if (rc) 2928 goto err_free_path; 2929 2930 2931 if (smb3_encryption_required(tcon)) 2932 flags |= CIFS_TRANSFORM_REQ; 2933 2934 req->ImpersonationLevel = IL_IMPERSONATION; 2935 req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES); 2936 /* File attributes ignored on open (used in create though) */ 2937 req->FileAttributes = cpu_to_le32(file_attributes); 2938 req->ShareAccess = FILE_SHARE_ALL_LE; 2939 req->CreateDisposition = cpu_to_le32(FILE_CREATE); 2940 req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE); 2941 2942 iov[0].iov_base = (char *)req; 2943 /* -1 since last byte is buf[0] which is sent below (path) */ 2944 iov[0].iov_len = total_len - 1; 2945 2946 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); 2947 2948 /* [MS-SMB2] 2.2.13 NameOffset: 2949 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of 2950 * the SMB2 header, the file name includes a prefix that will 2951 * be processed during DFS name normalization as specified in 2952 * section 3.3.5.9. Otherwise, the file name is relative to 2953 * the share that is identified by the TreeId in the SMB2 2954 * header. 2955 */ 2956 if (tcon->share_flags & SHI1005_FLAGS_DFS) { 2957 int name_len; 2958 2959 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; 2960 rc = alloc_path_with_tree_prefix(©_path, ©_size, 2961 &name_len, 2962 tcon->tree_name, utf16_path); 2963 if (rc) 2964 goto err_free_req; 2965 2966 req->NameLength = cpu_to_le16(name_len * 2); 2967 uni_path_len = copy_size; 2968 /* free before overwriting resource */ 2969 kfree(utf16_path); 2970 utf16_path = copy_path; 2971 } else { 2972 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2; 2973 /* MUST set path len (NameLength) to 0 opening root of share */ 2974 req->NameLength = cpu_to_le16(uni_path_len - 2); 2975 if (uni_path_len % 8 != 0) { 2976 copy_size = roundup(uni_path_len, 8); 2977 copy_path = kzalloc(copy_size, GFP_KERNEL); 2978 if (!copy_path) { 2979 rc = -ENOMEM; 2980 goto err_free_req; 2981 } 2982 memcpy((char *)copy_path, (const char *)utf16_path, 2983 uni_path_len); 2984 uni_path_len = copy_size; 2985 /* free before overwriting resource */ 2986 kfree(utf16_path); 2987 utf16_path = copy_path; 2988 } 2989 } 2990 2991 iov[1].iov_len = uni_path_len; 2992 iov[1].iov_base = utf16_path; 2993 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE; 2994 2995 if (tcon->posix_extensions) { 2996 /* resource #3: posix buf */ 2997 rc = add_posix_context(iov, &n_iov, mode); 2998 if (rc) 2999 goto err_free_req; 3000 req->CreateContextsOffset = cpu_to_le32( 3001 sizeof(struct smb2_create_req) + 3002 iov[1].iov_len); 3003 le32_add_cpu(&req->CreateContextsLength, iov[n_iov-1].iov_len); 3004 pc_buf = iov[n_iov-1].iov_base; 3005 } 3006 3007 3008 memset(&rqst, 0, sizeof(struct smb_rqst)); 3009 rqst.rq_iov = iov; 3010 rqst.rq_nvec = n_iov; 3011 3012 /* no need to inc num_remote_opens because we close it just below */ 3013 trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE, 3014 FILE_WRITE_ATTRIBUTES); 3015 3016 if (retries) { 3017 /* Back-off before retry */ 3018 if (cur_sleep) 3019 msleep(cur_sleep); 3020 smb2_set_replay(server, &rqst); 3021 } 3022 3023 /* resource #4: response buffer */ 3024 rc = cifs_send_recv(xid, ses, server, 3025 &rqst, &resp_buftype, flags, &rsp_iov); 3026 if (rc) { 3027 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); 3028 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid, 3029 CREATE_NOT_FILE, 3030 FILE_WRITE_ATTRIBUTES, rc); 3031 goto err_free_rsp_buf; 3032 } 3033 3034 /* 3035 * Although unlikely to be possible for rsp to be null and rc not set, 3036 * adding check below is slightly safer long term (and quiets Coverity 3037 * warning) 3038 */ 3039 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; 3040 if (rsp == NULL) { 3041 rc = smb_EIO(smb_eio_trace_mkdir_no_rsp); 3042 kfree(pc_buf); 3043 goto err_free_req; 3044 } 3045 3046 trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid, 3047 CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES); 3048 3049 SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId); 3050 3051 /* Eventually save off posix specific response info and timestamps */ 3052 3053 err_free_rsp_buf: 3054 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 3055 kfree(pc_buf); 3056 err_free_req: 3057 cifs_small_buf_release(req); 3058 err_free_path: 3059 kfree(utf16_path); 3060 3061 if (is_replayable_error(rc) && 3062 smb2_should_replay(tcon, &retries, &cur_sleep)) 3063 goto replay_again; 3064 3065 return rc; 3066 } 3067 3068 int 3069 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3070 struct smb_rqst *rqst, __u8 *oplock, 3071 struct cifs_open_parms *oparms, __le16 *path) 3072 { 3073 struct smb2_create_req *req; 3074 unsigned int n_iov = 2; 3075 __u32 file_attributes = 0; 3076 int copy_size; 3077 int uni_path_len; 3078 unsigned int total_len; 3079 struct kvec *iov = rqst->rq_iov; 3080 __le16 *copy_path; 3081 int rc; 3082 3083 rc = smb2_plain_req_init(SMB2_CREATE, tcon, server, 3084 (void **) &req, &total_len); 3085 if (rc) 3086 return rc; 3087 3088 iov[0].iov_base = (char *)req; 3089 /* -1 since last byte is buf[0] which is sent below (path) */ 3090 iov[0].iov_len = total_len - 1; 3091 3092 if (oparms->create_options & CREATE_OPTION_READONLY) 3093 file_attributes |= ATTR_READONLY; 3094 if (oparms->create_options & CREATE_OPTION_SPECIAL) 3095 file_attributes |= ATTR_SYSTEM; 3096 3097 req->ImpersonationLevel = IL_IMPERSONATION; 3098 req->DesiredAccess = cpu_to_le32(oparms->desired_access); 3099 /* File attributes ignored on open (used in create though) */ 3100 req->FileAttributes = cpu_to_le32(file_attributes); 3101 req->ShareAccess = FILE_SHARE_ALL_LE; 3102 3103 req->CreateDisposition = cpu_to_le32(oparms->disposition); 3104 req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK); 3105 req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); 3106 3107 /* [MS-SMB2] 2.2.13 NameOffset: 3108 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of 3109 * the SMB2 header, the file name includes a prefix that will 3110 * be processed during DFS name normalization as specified in 3111 * section 3.3.5.9. Otherwise, the file name is relative to 3112 * the share that is identified by the TreeId in the SMB2 3113 * header. 3114 */ 3115 if (tcon->share_flags & SHI1005_FLAGS_DFS) { 3116 int name_len; 3117 3118 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; 3119 rc = alloc_path_with_tree_prefix(©_path, ©_size, 3120 &name_len, 3121 tcon->tree_name, path); 3122 if (rc) 3123 return rc; 3124 req->NameLength = cpu_to_le16(name_len * 2); 3125 uni_path_len = copy_size; 3126 path = copy_path; 3127 } else { 3128 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2; 3129 /* MUST set path len (NameLength) to 0 opening root of share */ 3130 req->NameLength = cpu_to_le16(uni_path_len - 2); 3131 copy_size = round_up(uni_path_len, 8); 3132 copy_path = kzalloc(copy_size, GFP_KERNEL); 3133 if (!copy_path) 3134 return -ENOMEM; 3135 memcpy((char *)copy_path, (const char *)path, 3136 uni_path_len); 3137 uni_path_len = copy_size; 3138 path = copy_path; 3139 } 3140 3141 iov[1].iov_len = uni_path_len; 3142 iov[1].iov_base = path; 3143 3144 if ((!server->oplocks) || (tcon->no_lease)) 3145 *oplock = SMB2_OPLOCK_LEVEL_NONE; 3146 3147 if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) || 3148 *oplock == SMB2_OPLOCK_LEVEL_NONE) 3149 req->RequestedOplockLevel = *oplock; 3150 else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) && 3151 (oparms->create_options & CREATE_NOT_FILE)) 3152 req->RequestedOplockLevel = *oplock; /* no srv lease support */ 3153 else { 3154 rc = add_lease_context(server, req, iov, &n_iov, 3155 oparms->fid->lease_key, oplock, 3156 oparms->fid->parent_lease_key, 3157 oparms->lease_flags); 3158 if (rc) 3159 return rc; 3160 } 3161 3162 if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) { 3163 rc = add_durable_context(iov, &n_iov, oparms, 3164 tcon->use_persistent); 3165 if (rc) 3166 return rc; 3167 } 3168 3169 if (tcon->posix_extensions) { 3170 rc = add_posix_context(iov, &n_iov, oparms->mode); 3171 if (rc) 3172 return rc; 3173 } 3174 3175 if (tcon->snapshot_time) { 3176 cifs_dbg(FYI, "adding snapshot context\n"); 3177 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time); 3178 if (rc) 3179 return rc; 3180 } 3181 3182 if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) { 3183 unsigned int sbflags = cifs_sb_flags(oparms->cifs_sb); 3184 bool set_mode; 3185 bool set_owner; 3186 3187 if ((sbflags & CIFS_MOUNT_MODE_FROM_SID) && 3188 oparms->mode != ACL_NO_MODE) { 3189 set_mode = true; 3190 } else { 3191 set_mode = false; 3192 oparms->mode = ACL_NO_MODE; 3193 } 3194 3195 set_owner = sbflags & CIFS_MOUNT_UID_FROM_ACL; 3196 if (set_owner | set_mode) { 3197 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode); 3198 rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner); 3199 if (rc) 3200 return rc; 3201 } 3202 } 3203 3204 add_query_id_context(iov, &n_iov); 3205 add_ea_context(oparms, iov, &n_iov); 3206 3207 if (n_iov > 2) { 3208 /* 3209 * We have create contexts behind iov[1] (the file 3210 * name), point at them from the main create request 3211 */ 3212 req->CreateContextsOffset = cpu_to_le32( 3213 sizeof(struct smb2_create_req) + 3214 iov[1].iov_len); 3215 req->CreateContextsLength = 0; 3216 3217 for (unsigned int i = 2; i < (n_iov-1); i++) { 3218 struct kvec *v = &iov[i]; 3219 size_t len = v->iov_len; 3220 struct create_context *cctx = 3221 (struct create_context *)v->iov_base; 3222 3223 cctx->Next = cpu_to_le32(len); 3224 le32_add_cpu(&req->CreateContextsLength, len); 3225 } 3226 le32_add_cpu(&req->CreateContextsLength, 3227 iov[n_iov-1].iov_len); 3228 } 3229 3230 rqst->rq_nvec = n_iov; 3231 return 0; 3232 } 3233 3234 /* rq_iov[0] is the request and is released by cifs_small_buf_release(). 3235 * All other vectors are freed by kfree(). 3236 */ 3237 void 3238 SMB2_open_free(struct smb_rqst *rqst) 3239 { 3240 int i; 3241 3242 if (rqst && rqst->rq_iov) { 3243 cifs_small_buf_release(rqst->rq_iov[0].iov_base); 3244 for (i = 1; i < rqst->rq_nvec; i++) 3245 if (rqst->rq_iov[i].iov_base != smb2_padding) 3246 kfree(rqst->rq_iov[i].iov_base); 3247 } 3248 } 3249 3250 int 3251 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path, 3252 __u8 *oplock, struct smb2_file_all_info *buf, 3253 struct create_posix_rsp *posix, 3254 struct kvec *err_iov, int *buftype) 3255 { 3256 struct smb_rqst rqst; 3257 struct smb2_create_rsp *rsp = NULL; 3258 struct cifs_tcon *tcon = oparms->tcon; 3259 struct cifs_ses *ses = tcon->ses; 3260 struct TCP_Server_Info *server; 3261 struct kvec iov[SMB2_CREATE_IOV_SIZE]; 3262 struct kvec rsp_iov = {NULL, 0}; 3263 int resp_buftype = CIFS_NO_BUFFER; 3264 int rc = 0; 3265 int flags = 0; 3266 int retries = 0, cur_sleep = 0; 3267 3268 replay_again: 3269 /* reinitialize for possible replay */ 3270 flags = 0; 3271 server = cifs_pick_channel(ses); 3272 oparms->replay = !!(retries); 3273 3274 cifs_dbg(FYI, "create/open\n"); 3275 if (!ses || !server) 3276 return smb_EIO(smb_eio_trace_null_pointers); 3277 3278 if (smb3_encryption_required(tcon)) 3279 flags |= CIFS_TRANSFORM_REQ; 3280 3281 memset(&rqst, 0, sizeof(struct smb_rqst)); 3282 memset(&iov, 0, sizeof(iov)); 3283 rqst.rq_iov = iov; 3284 rqst.rq_nvec = SMB2_CREATE_IOV_SIZE; 3285 3286 rc = SMB2_open_init(tcon, server, 3287 &rqst, oplock, oparms, path); 3288 if (rc) 3289 goto creat_exit; 3290 3291 trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path, 3292 oparms->create_options, oparms->desired_access); 3293 3294 if (retries) { 3295 /* Back-off before retry */ 3296 if (cur_sleep) 3297 msleep(cur_sleep); 3298 smb2_set_replay(server, &rqst); 3299 } 3300 3301 rc = cifs_send_recv(xid, ses, server, 3302 &rqst, &resp_buftype, flags, 3303 &rsp_iov); 3304 rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; 3305 3306 if (rc != 0) { 3307 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); 3308 if (err_iov && rsp) { 3309 *err_iov = rsp_iov; 3310 *buftype = resp_buftype; 3311 resp_buftype = CIFS_NO_BUFFER; 3312 rsp = NULL; 3313 } 3314 trace_smb3_open_err(xid, tcon->tid, ses->Suid, 3315 oparms->create_options, oparms->desired_access, rc); 3316 if (rc == -EREMCHG) { 3317 pr_warn_once("server share %s deleted\n", 3318 tcon->tree_name); 3319 tcon->need_reconnect = true; 3320 } 3321 goto creat_exit; 3322 } else if (rsp == NULL) /* unlikely to happen, but safer to check */ 3323 goto creat_exit; 3324 else 3325 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid, 3326 oparms->create_options, oparms->desired_access); 3327 3328 atomic_inc(&tcon->num_remote_opens); 3329 oparms->fid->persistent_fid = rsp->PersistentFileId; 3330 oparms->fid->volatile_fid = rsp->VolatileFileId; 3331 oparms->fid->access = oparms->desired_access; 3332 #ifdef CONFIG_CIFS_DEBUG2 3333 oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId); 3334 #endif /* CIFS_DEBUG2 */ 3335 3336 if (buf) { 3337 buf->CreationTime = rsp->CreationTime; 3338 buf->LastAccessTime = rsp->LastAccessTime; 3339 buf->LastWriteTime = rsp->LastWriteTime; 3340 buf->ChangeTime = rsp->ChangeTime; 3341 buf->AllocationSize = rsp->AllocationSize; 3342 buf->EndOfFile = rsp->EndofFile; 3343 buf->Attributes = rsp->FileAttributes; 3344 buf->NumberOfLinks = cpu_to_le32(1); 3345 buf->DeletePending = 0; /* successful open = not delete pending */ 3346 } 3347 3348 3349 rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch, 3350 oparms->fid->lease_key, oplock, buf, posix); 3351 creat_exit: 3352 SMB2_open_free(&rqst); 3353 free_rsp_buf(resp_buftype, rsp); 3354 3355 if (is_replayable_error(rc) && 3356 smb2_should_replay(tcon, &retries, &cur_sleep)) 3357 goto replay_again; 3358 3359 return rc; 3360 } 3361 3362 int 3363 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3364 struct smb_rqst *rqst, 3365 u64 persistent_fid, u64 volatile_fid, u32 opcode, 3366 char *in_data, u32 indatalen, 3367 __u32 max_response_size) 3368 { 3369 struct smb2_ioctl_req *req; 3370 struct kvec *iov = rqst->rq_iov; 3371 unsigned int total_len; 3372 int rc; 3373 char *in_data_buf; 3374 3375 rc = smb2_ioctl_req_init(opcode, tcon, server, 3376 (void **) &req, &total_len); 3377 if (rc) 3378 return rc; 3379 3380 if (indatalen) { 3381 /* 3382 * indatalen is usually small at a couple of bytes max, so 3383 * just allocate through generic pool 3384 */ 3385 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS); 3386 if (!in_data_buf) { 3387 cifs_small_buf_release(req); 3388 return -ENOMEM; 3389 } 3390 } 3391 3392 req->CtlCode = cpu_to_le32(opcode); 3393 req->PersistentFileId = persistent_fid; 3394 req->VolatileFileId = volatile_fid; 3395 3396 iov[0].iov_base = (char *)req; 3397 /* 3398 * If no input data, the size of ioctl struct in 3399 * protocol spec still includes a 1 byte data buffer, 3400 * but if input data passed to ioctl, we do not 3401 * want to double count this, so we do not send 3402 * the dummy one byte of data in iovec[0] if sending 3403 * input data (in iovec[1]). 3404 */ 3405 if (indatalen) { 3406 req->InputCount = cpu_to_le32(indatalen); 3407 /* do not set InputOffset if no input data */ 3408 req->InputOffset = 3409 cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer)); 3410 rqst->rq_nvec = 2; 3411 iov[0].iov_len = total_len - 1; 3412 iov[1].iov_base = in_data_buf; 3413 iov[1].iov_len = indatalen; 3414 } else { 3415 rqst->rq_nvec = 1; 3416 iov[0].iov_len = total_len; 3417 } 3418 3419 req->OutputOffset = 0; 3420 req->OutputCount = 0; /* MBZ */ 3421 3422 /* 3423 * In most cases max_response_size is set to 16K (CIFSMaxBufSize) 3424 * We Could increase default MaxOutputResponse, but that could require 3425 * more credits. Windows typically sets this smaller, but for some 3426 * ioctls it may be useful to allow server to send more. No point 3427 * limiting what the server can send as long as fits in one credit 3428 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want 3429 * to increase this limit up in the future. 3430 * Note that for snapshot queries that servers like Azure expect that 3431 * the first query be minimal size (and just used to get the number/size 3432 * of previous versions) so response size must be specified as EXACTLY 3433 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple 3434 * of eight bytes. Currently that is the only case where we set max 3435 * response size smaller. 3436 */ 3437 req->MaxOutputResponse = cpu_to_le32(max_response_size); 3438 req->hdr.CreditCharge = 3439 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size), 3440 SMB2_MAX_BUFFER_SIZE)); 3441 /* always an FSCTL (for now) */ 3442 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL); 3443 3444 /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */ 3445 if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) 3446 req->hdr.Flags |= SMB2_FLAGS_SIGNED; 3447 3448 return 0; 3449 } 3450 3451 void 3452 SMB2_ioctl_free(struct smb_rqst *rqst) 3453 { 3454 int i; 3455 3456 if (rqst && rqst->rq_iov) { 3457 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3458 for (i = 1; i < rqst->rq_nvec; i++) 3459 if (rqst->rq_iov[i].iov_base != smb2_padding) 3460 kfree(rqst->rq_iov[i].iov_base); 3461 } 3462 } 3463 3464 3465 /* 3466 * SMB2 IOCTL is used for both IOCTLs and FSCTLs 3467 */ 3468 int 3469 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 3470 u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen, 3471 u32 max_out_data_len, char **out_data, 3472 u32 *plen /* returned data len */) 3473 { 3474 struct smb_rqst rqst; 3475 struct smb2_ioctl_rsp *rsp = NULL; 3476 struct cifs_ses *ses; 3477 struct TCP_Server_Info *server; 3478 struct kvec iov[SMB2_IOCTL_IOV_SIZE]; 3479 struct kvec rsp_iov = {NULL, 0}; 3480 int resp_buftype = CIFS_NO_BUFFER; 3481 int rc = 0; 3482 int flags = 0; 3483 int retries = 0, cur_sleep = 0; 3484 3485 if (!tcon) 3486 return smb_EIO(smb_eio_trace_null_pointers); 3487 3488 ses = tcon->ses; 3489 if (!ses) 3490 return smb_EIO(smb_eio_trace_null_pointers); 3491 3492 replay_again: 3493 /* reinitialize for possible replay */ 3494 flags = 0; 3495 server = cifs_pick_channel(ses); 3496 3497 if (!server) 3498 return smb_EIO(smb_eio_trace_null_pointers); 3499 3500 cifs_dbg(FYI, "SMB2 IOCTL\n"); 3501 3502 if (out_data != NULL) 3503 *out_data = NULL; 3504 3505 /* zero out returned data len, in case of error */ 3506 if (plen) 3507 *plen = 0; 3508 3509 if (smb3_encryption_required(tcon)) 3510 flags |= CIFS_TRANSFORM_REQ; 3511 3512 memset(&rqst, 0, sizeof(struct smb_rqst)); 3513 memset(&iov, 0, sizeof(iov)); 3514 rqst.rq_iov = iov; 3515 rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE; 3516 3517 rc = SMB2_ioctl_init(tcon, server, 3518 &rqst, persistent_fid, volatile_fid, opcode, 3519 in_data, indatalen, max_out_data_len); 3520 if (rc) 3521 goto ioctl_exit; 3522 3523 if (retries) { 3524 /* Back-off before retry */ 3525 if (cur_sleep) 3526 msleep(cur_sleep); 3527 smb2_set_replay(server, &rqst); 3528 } 3529 3530 rc = cifs_send_recv(xid, ses, server, 3531 &rqst, &resp_buftype, flags, 3532 &rsp_iov); 3533 rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base; 3534 3535 if (rc != 0) 3536 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid, 3537 ses->Suid, 0, opcode, rc); 3538 3539 if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) { 3540 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3541 goto ioctl_exit; 3542 } else if (rc == -EINVAL) { 3543 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) && 3544 (opcode != FSCTL_SRV_COPYCHUNK)) { 3545 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3546 goto ioctl_exit; 3547 } 3548 } else if (rc == -E2BIG) { 3549 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) { 3550 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); 3551 goto ioctl_exit; 3552 } 3553 } 3554 3555 /* check if caller wants to look at return data or just return rc */ 3556 if ((plen == NULL) || (out_data == NULL)) 3557 goto ioctl_exit; 3558 3559 /* 3560 * Although unlikely to be possible for rsp to be null and rc not set, 3561 * adding check below is slightly safer long term (and quiets Coverity 3562 * warning) 3563 */ 3564 if (rsp == NULL) { 3565 rc = smb_EIO(smb_eio_trace_ioctl_no_rsp); 3566 goto ioctl_exit; 3567 } 3568 3569 *plen = le32_to_cpu(rsp->OutputCount); 3570 3571 /* We check for obvious errors in the output buffer length and offset */ 3572 if (*plen == 0) 3573 goto ioctl_exit; /* server returned no data */ 3574 else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) { 3575 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen); 3576 rc = smb_EIO2(smb_eio_trace_ioctl_data_len, *plen, rsp_iov.iov_len); 3577 *plen = 0; 3578 goto ioctl_exit; 3579 } 3580 3581 u32 outoff = le32_to_cpu(rsp->OutputOffset); 3582 3583 if (rsp_iov.iov_len - *plen < outoff) { 3584 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", 3585 *plen, outoff); 3586 rc = smb_EIO2(smb_eio_trace_ioctl_out_off, rsp_iov.iov_len - *plen, outoff); 3587 *plen = 0; 3588 goto ioctl_exit; 3589 } 3590 3591 *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset), 3592 *plen, GFP_KERNEL); 3593 if (*out_data == NULL) { 3594 rc = -ENOMEM; 3595 goto ioctl_exit; 3596 } 3597 3598 ioctl_exit: 3599 SMB2_ioctl_free(&rqst); 3600 free_rsp_buf(resp_buftype, rsp); 3601 3602 if (is_replayable_error(rc) && 3603 smb2_should_replay(tcon, &retries, &cur_sleep)) 3604 goto replay_again; 3605 3606 return rc; 3607 } 3608 3609 /* 3610 * Individual callers to ioctl worker function follow 3611 */ 3612 3613 int 3614 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon, 3615 u64 persistent_fid, u64 volatile_fid) 3616 { 3617 int rc; 3618 struct compress_ioctl fsctl_input; 3619 char *ret_data = NULL; 3620 3621 fsctl_input.CompressionState = 3622 cpu_to_le16(COMPRESSION_FORMAT_DEFAULT); 3623 3624 rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid, 3625 FSCTL_SET_COMPRESSION, 3626 (char *)&fsctl_input /* data input */, 3627 2 /* in data len */, CIFSMaxBufSize /* max out data */, 3628 &ret_data /* out data */, NULL); 3629 3630 cifs_dbg(FYI, "set compression rc %d\n", rc); 3631 3632 return rc; 3633 } 3634 3635 int 3636 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3637 struct smb_rqst *rqst, 3638 u64 persistent_fid, u64 volatile_fid, bool query_attrs) 3639 { 3640 struct smb2_close_req *req; 3641 struct kvec *iov = rqst->rq_iov; 3642 unsigned int total_len; 3643 int rc; 3644 3645 rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server, 3646 (void **) &req, &total_len); 3647 if (rc) 3648 return rc; 3649 3650 req->PersistentFileId = persistent_fid; 3651 req->VolatileFileId = volatile_fid; 3652 if (query_attrs) 3653 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB; 3654 else 3655 req->Flags = 0; 3656 iov[0].iov_base = (char *)req; 3657 iov[0].iov_len = total_len; 3658 3659 return 0; 3660 } 3661 3662 void 3663 SMB2_close_free(struct smb_rqst *rqst) 3664 { 3665 if (rqst && rqst->rq_iov) 3666 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3667 } 3668 3669 int 3670 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, 3671 u64 persistent_fid, u64 volatile_fid, 3672 struct smb2_file_network_open_info *pbuf) 3673 { 3674 struct smb_rqst rqst; 3675 struct smb2_close_rsp *rsp = NULL; 3676 struct cifs_ses *ses = tcon->ses; 3677 struct TCP_Server_Info *server; 3678 struct kvec iov[1]; 3679 struct kvec rsp_iov; 3680 int resp_buftype = CIFS_NO_BUFFER; 3681 int rc = 0; 3682 int flags = 0; 3683 bool query_attrs = false; 3684 int retries = 0, cur_sleep = 0; 3685 3686 replay_again: 3687 /* reinitialize for possible replay */ 3688 flags = 0; 3689 query_attrs = false; 3690 server = cifs_pick_channel(ses); 3691 3692 cifs_dbg(FYI, "Close\n"); 3693 3694 if (!ses || !server) 3695 return smb_EIO(smb_eio_trace_null_pointers); 3696 3697 if (smb3_encryption_required(tcon)) 3698 flags |= CIFS_TRANSFORM_REQ; 3699 3700 memset(&rqst, 0, sizeof(struct smb_rqst)); 3701 memset(&iov, 0, sizeof(iov)); 3702 rqst.rq_iov = iov; 3703 rqst.rq_nvec = 1; 3704 3705 /* check if need to ask server to return timestamps in close response */ 3706 if (pbuf) 3707 query_attrs = true; 3708 3709 trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid); 3710 rc = SMB2_close_init(tcon, server, 3711 &rqst, persistent_fid, volatile_fid, 3712 query_attrs); 3713 if (rc) 3714 goto close_exit; 3715 3716 if (retries) { 3717 /* Back-off before retry */ 3718 if (cur_sleep) 3719 msleep(cur_sleep); 3720 smb2_set_replay(server, &rqst); 3721 } 3722 3723 rc = cifs_send_recv(xid, ses, server, 3724 &rqst, &resp_buftype, flags, &rsp_iov); 3725 rsp = (struct smb2_close_rsp *)rsp_iov.iov_base; 3726 3727 if (rc != 0) { 3728 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE); 3729 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid, 3730 rc); 3731 goto close_exit; 3732 } else { 3733 trace_smb3_close_done(xid, persistent_fid, tcon->tid, 3734 ses->Suid); 3735 if (pbuf) 3736 memcpy(&pbuf->network_open_info, 3737 &rsp->network_open_info, 3738 sizeof(pbuf->network_open_info)); 3739 atomic_dec(&tcon->num_remote_opens); 3740 } 3741 3742 close_exit: 3743 SMB2_close_free(&rqst); 3744 free_rsp_buf(resp_buftype, rsp); 3745 3746 /* retry close in a worker thread if this one is interrupted */ 3747 if (is_interrupt_error(rc)) { 3748 int tmp_rc; 3749 3750 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid, 3751 volatile_fid); 3752 if (tmp_rc) 3753 cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n", 3754 persistent_fid, tmp_rc); 3755 } 3756 3757 if (is_replayable_error(rc) && 3758 smb2_should_replay(tcon, &retries, &cur_sleep)) 3759 goto replay_again; 3760 3761 return rc; 3762 } 3763 3764 int 3765 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, 3766 u64 persistent_fid, u64 volatile_fid) 3767 { 3768 return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL); 3769 } 3770 3771 int 3772 smb2_validate_iov(unsigned int offset, unsigned int buffer_length, 3773 struct kvec *iov, unsigned int min_buf_size) 3774 { 3775 unsigned int smb_len = iov->iov_len; 3776 char *end_of_smb = smb_len + (char *)iov->iov_base; 3777 char *begin_of_buf = offset + (char *)iov->iov_base; 3778 char *end_of_buf = begin_of_buf + buffer_length; 3779 3780 3781 if (buffer_length < min_buf_size) { 3782 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n", 3783 buffer_length, min_buf_size); 3784 return -EINVAL; 3785 } 3786 3787 /* check if beyond RFC1001 maximum length */ 3788 if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) { 3789 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n", 3790 buffer_length, smb_len); 3791 return -EINVAL; 3792 } 3793 3794 if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) { 3795 cifs_dbg(VFS, "Invalid server response, bad offset to data\n"); 3796 return -EINVAL; 3797 } 3798 3799 return 0; 3800 } 3801 3802 /* 3803 * If SMB buffer fields are valid, copy into temporary buffer to hold result. 3804 * Caller must free buffer. 3805 */ 3806 int 3807 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length, 3808 struct kvec *iov, unsigned int minbufsize, 3809 char *data) 3810 { 3811 char *begin_of_buf = offset + (char *)iov->iov_base; 3812 int rc; 3813 3814 if (!data) 3815 return -EINVAL; 3816 3817 rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize); 3818 if (rc) 3819 return rc; 3820 3821 memcpy(data, begin_of_buf, minbufsize); 3822 3823 return 0; 3824 } 3825 3826 int 3827 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 3828 struct smb_rqst *rqst, 3829 u64 persistent_fid, u64 volatile_fid, 3830 u8 info_class, u8 info_type, u32 additional_info, 3831 size_t output_len, size_t input_len, void *input) 3832 { 3833 struct smb2_query_info_req *req; 3834 struct kvec *iov = rqst->rq_iov; 3835 unsigned int total_len; 3836 size_t len; 3837 int rc; 3838 3839 if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) || 3840 len > CIFSMaxBufSize)) 3841 return -EINVAL; 3842 3843 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server, 3844 (void **) &req, &total_len); 3845 if (rc) 3846 return rc; 3847 3848 req->InfoType = info_type; 3849 req->FileInfoClass = info_class; 3850 req->PersistentFileId = persistent_fid; 3851 req->VolatileFileId = volatile_fid; 3852 req->AdditionalInformation = cpu_to_le32(additional_info); 3853 3854 req->OutputBufferLength = cpu_to_le32(output_len); 3855 if (input_len) { 3856 req->InputBufferLength = cpu_to_le32(input_len); 3857 /* total_len for smb query request never close to le16 max */ 3858 req->InputBufferOffset = cpu_to_le16(total_len - 1); 3859 memcpy(req->Buffer, input, input_len); 3860 } 3861 3862 iov[0].iov_base = (char *)req; 3863 /* 1 for Buffer */ 3864 iov[0].iov_len = len; 3865 return 0; 3866 } 3867 3868 void 3869 SMB2_query_info_free(struct smb_rqst *rqst) 3870 { 3871 if (rqst && rqst->rq_iov) 3872 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */ 3873 } 3874 3875 static int 3876 query_info(const unsigned int xid, struct cifs_tcon *tcon, 3877 u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type, 3878 u32 additional_info, size_t output_len, size_t min_len, void **data, 3879 u32 *dlen) 3880 { 3881 struct smb_rqst rqst; 3882 struct smb2_query_info_rsp *rsp = NULL; 3883 struct kvec iov[1]; 3884 struct kvec rsp_iov; 3885 int rc = 0; 3886 int resp_buftype = CIFS_NO_BUFFER; 3887 struct cifs_ses *ses = tcon->ses; 3888 struct TCP_Server_Info *server; 3889 int flags = 0; 3890 bool allocated = false; 3891 int retries = 0, cur_sleep = 0; 3892 3893 cifs_dbg(FYI, "Query Info\n"); 3894 3895 if (!ses) 3896 return smb_EIO(smb_eio_trace_null_pointers); 3897 3898 replay_again: 3899 /* reinitialize for possible replay */ 3900 flags = 0; 3901 allocated = false; 3902 server = cifs_pick_channel(ses); 3903 3904 if (!server) 3905 return smb_EIO(smb_eio_trace_null_pointers); 3906 3907 if (smb3_encryption_required(tcon)) 3908 flags |= CIFS_TRANSFORM_REQ; 3909 3910 memset(&rqst, 0, sizeof(struct smb_rqst)); 3911 memset(&iov, 0, sizeof(iov)); 3912 rqst.rq_iov = iov; 3913 rqst.rq_nvec = 1; 3914 3915 rc = SMB2_query_info_init(tcon, server, 3916 &rqst, persistent_fid, volatile_fid, 3917 info_class, info_type, additional_info, 3918 output_len, 0, NULL); 3919 if (rc) 3920 goto qinf_exit; 3921 3922 trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid, 3923 ses->Suid, info_class, (__u32)info_type); 3924 3925 if (retries) { 3926 /* Back-off before retry */ 3927 if (cur_sleep) 3928 msleep(cur_sleep); 3929 smb2_set_replay(server, &rqst); 3930 } 3931 3932 rc = cifs_send_recv(xid, ses, server, 3933 &rqst, &resp_buftype, flags, &rsp_iov); 3934 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 3935 3936 if (rc) { 3937 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 3938 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid, 3939 ses->Suid, info_class, (__u32)info_type, rc); 3940 goto qinf_exit; 3941 } 3942 3943 trace_smb3_query_info_done(xid, persistent_fid, tcon->tid, 3944 ses->Suid, info_class, (__u32)info_type); 3945 3946 if (dlen) { 3947 *dlen = le32_to_cpu(rsp->OutputBufferLength); 3948 if (!*data) { 3949 *data = kmalloc(*dlen, GFP_KERNEL); 3950 if (!*data) { 3951 cifs_tcon_dbg(VFS, 3952 "Error %d allocating memory for acl\n", 3953 rc); 3954 *dlen = 0; 3955 rc = -ENOMEM; 3956 goto qinf_exit; 3957 } 3958 allocated = true; 3959 } 3960 } 3961 3962 rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset), 3963 le32_to_cpu(rsp->OutputBufferLength), 3964 &rsp_iov, dlen ? *dlen : min_len, *data); 3965 if (rc && allocated) { 3966 kfree(*data); 3967 *data = NULL; 3968 *dlen = 0; 3969 } 3970 3971 qinf_exit: 3972 SMB2_query_info_free(&rqst); 3973 free_rsp_buf(resp_buftype, rsp); 3974 3975 if (is_replayable_error(rc) && 3976 smb2_should_replay(tcon, &retries, &cur_sleep)) 3977 goto replay_again; 3978 3979 return rc; 3980 } 3981 3982 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon, 3983 u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data) 3984 { 3985 return query_info(xid, tcon, persistent_fid, volatile_fid, 3986 FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0, 3987 sizeof(struct smb2_file_all_info) + PATH_MAX * 2, 3988 sizeof(struct smb2_file_all_info), (void **)&data, 3989 NULL); 3990 } 3991 3992 int 3993 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon, 3994 u64 persistent_fid, u64 volatile_fid, 3995 void **data, u32 *plen, u32 extra_info) 3996 { 3997 *plen = 0; 3998 3999 return query_info(xid, tcon, persistent_fid, volatile_fid, 4000 0, SMB2_O_INFO_SECURITY, extra_info, 4001 SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen); 4002 } 4003 4004 int 4005 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon, 4006 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid) 4007 { 4008 return query_info(xid, tcon, persistent_fid, volatile_fid, 4009 FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0, 4010 sizeof(struct smb2_file_internal_info), 4011 sizeof(struct smb2_file_internal_info), 4012 (void **)&uniqueid, NULL); 4013 } 4014 4015 /* 4016 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory 4017 * See MS-SMB2 2.2.35 and 2.2.36 4018 */ 4019 4020 static int 4021 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst, 4022 struct cifs_tcon *tcon, struct TCP_Server_Info *server, 4023 u64 persistent_fid, u64 volatile_fid, 4024 u32 completion_filter, bool watch_tree) 4025 { 4026 struct smb2_change_notify_req *req; 4027 struct kvec *iov = rqst->rq_iov; 4028 unsigned int total_len; 4029 int rc; 4030 4031 rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server, 4032 (void **) &req, &total_len); 4033 if (rc) 4034 return rc; 4035 4036 req->PersistentFileId = persistent_fid; 4037 req->VolatileFileId = volatile_fid; 4038 /* See note 354 of MS-SMB2, 64K max */ 4039 req->OutputBufferLength = 4040 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE); 4041 req->CompletionFilter = cpu_to_le32(completion_filter); 4042 if (watch_tree) 4043 req->Flags = cpu_to_le16(SMB2_WATCH_TREE); 4044 else 4045 req->Flags = 0; 4046 4047 iov[0].iov_base = (char *)req; 4048 iov[0].iov_len = total_len; 4049 4050 return 0; 4051 } 4052 4053 int 4054 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon, 4055 u64 persistent_fid, u64 volatile_fid, bool watch_tree, 4056 u32 completion_filter, u32 max_out_data_len, char **out_data, 4057 u32 *plen /* returned data len */) 4058 { 4059 struct cifs_ses *ses = tcon->ses; 4060 struct TCP_Server_Info *server; 4061 struct smb_rqst rqst; 4062 struct smb2_change_notify_rsp *smb_rsp; 4063 struct kvec iov[1]; 4064 struct kvec rsp_iov = {NULL, 0}; 4065 int resp_buftype = CIFS_NO_BUFFER; 4066 int flags = 0; 4067 int rc = 0; 4068 int retries = 0, cur_sleep = 0; 4069 4070 replay_again: 4071 /* reinitialize for possible replay */ 4072 flags = 0; 4073 server = cifs_pick_channel(ses); 4074 4075 cifs_dbg(FYI, "change notify\n"); 4076 if (!ses || !server) 4077 return smb_EIO(smb_eio_trace_null_pointers); 4078 4079 if (smb3_encryption_required(tcon)) 4080 flags |= CIFS_TRANSFORM_REQ; 4081 4082 memset(&rqst, 0, sizeof(struct smb_rqst)); 4083 memset(&iov, 0, sizeof(iov)); 4084 if (plen) 4085 *plen = 0; 4086 4087 rqst.rq_iov = iov; 4088 rqst.rq_nvec = 1; 4089 4090 rc = SMB2_notify_init(xid, &rqst, tcon, server, 4091 persistent_fid, volatile_fid, 4092 completion_filter, watch_tree); 4093 if (rc) 4094 goto cnotify_exit; 4095 4096 trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid, 4097 (u8)watch_tree, completion_filter); 4098 4099 if (retries) { 4100 /* Back-off before retry */ 4101 if (cur_sleep) 4102 msleep(cur_sleep); 4103 smb2_set_replay(server, &rqst); 4104 } 4105 4106 rc = cifs_send_recv(xid, ses, server, 4107 &rqst, &resp_buftype, flags, &rsp_iov); 4108 4109 if (rc != 0) { 4110 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE); 4111 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid, 4112 (u8)watch_tree, completion_filter, rc); 4113 } else { 4114 trace_smb3_notify_done(xid, persistent_fid, tcon->tid, 4115 ses->Suid, (u8)watch_tree, completion_filter); 4116 /* validate that notify information is plausible */ 4117 if ((rsp_iov.iov_base == NULL) || 4118 (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1)) 4119 goto cnotify_exit; 4120 4121 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base; 4122 4123 rc = smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset), 4124 le32_to_cpu(smb_rsp->OutputBufferLength), 4125 &rsp_iov, 4126 sizeof(struct file_notify_information)); 4127 if (rc) 4128 goto cnotify_exit; 4129 4130 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset), 4131 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL); 4132 if (*out_data == NULL) { 4133 rc = -ENOMEM; 4134 goto cnotify_exit; 4135 } else if (plen) 4136 *plen = le32_to_cpu(smb_rsp->OutputBufferLength); 4137 } 4138 4139 cnotify_exit: 4140 if (rqst.rq_iov) 4141 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */ 4142 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4143 4144 if (is_replayable_error(rc) && 4145 smb2_should_replay(tcon, &retries, &cur_sleep)) 4146 goto replay_again; 4147 4148 return rc; 4149 } 4150 4151 4152 4153 /* 4154 * This is a no-op for now. We're not really interested in the reply, but 4155 * rather in the fact that the server sent one and that server->lstrp 4156 * gets updated. 4157 * 4158 * FIXME: maybe we should consider checking that the reply matches request? 4159 */ 4160 static void 4161 smb2_echo_callback(struct TCP_Server_Info *server, struct mid_q_entry *mid) 4162 { 4163 struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf; 4164 struct cifs_credits credits = { .value = 0, .instance = 0 }; 4165 4166 if (mid->mid_state == MID_RESPONSE_RECEIVED 4167 || mid->mid_state == MID_RESPONSE_MALFORMED) { 4168 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 4169 credits.instance = server->reconnect_instance; 4170 } 4171 4172 release_mid(server, mid); 4173 add_credits(server, &credits, CIFS_ECHO_OP); 4174 } 4175 4176 static void cifs_renegotiate_iosize(struct TCP_Server_Info *server, 4177 struct cifs_tcon *tcon) 4178 { 4179 struct cifs_sb_info *cifs_sb; 4180 4181 if (server == NULL || tcon == NULL) 4182 return; 4183 4184 spin_lock(&tcon->sb_list_lock); 4185 list_for_each_entry(cifs_sb, &tcon->cifs_sb_list, tcon_sb_link) 4186 cifs_negotiate_iosize(server, cifs_sb->ctx, tcon); 4187 spin_unlock(&tcon->sb_list_lock); 4188 } 4189 4190 void smb2_reconnect_server(struct work_struct *work) 4191 { 4192 struct TCP_Server_Info *server = container_of(work, 4193 struct TCP_Server_Info, reconnect.work); 4194 struct TCP_Server_Info *pserver; 4195 struct cifs_ses *ses, *ses2; 4196 struct cifs_tcon *tcon, *tcon2; 4197 struct list_head tmp_list, tmp_ses_list; 4198 bool ses_exist = false; 4199 bool tcon_selected = false; 4200 int rc; 4201 bool resched = false; 4202 4203 /* first check if ref count has reached 0, if not inc ref count */ 4204 spin_lock(&cifs_tcp_ses_lock); 4205 if (!server->srv_count) { 4206 spin_unlock(&cifs_tcp_ses_lock); 4207 return; 4208 } 4209 server->srv_count++; 4210 spin_unlock(&cifs_tcp_ses_lock); 4211 4212 /* If server is a channel, select the primary channel */ 4213 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 4214 4215 /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */ 4216 mutex_lock(&pserver->reconnect_mutex); 4217 4218 /* if the server is marked for termination, drop the ref count here */ 4219 if (server->terminate) { 4220 cifs_put_tcp_session(server, true); 4221 mutex_unlock(&pserver->reconnect_mutex); 4222 return; 4223 } 4224 4225 INIT_LIST_HEAD(&tmp_list); 4226 INIT_LIST_HEAD(&tmp_ses_list); 4227 cifs_dbg(FYI, "Reconnecting tcons and channels\n"); 4228 4229 spin_lock(&cifs_tcp_ses_lock); 4230 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { 4231 spin_lock(&ses->ses_lock); 4232 if (ses->ses_status == SES_EXITING) { 4233 spin_unlock(&ses->ses_lock); 4234 continue; 4235 } 4236 spin_unlock(&ses->ses_lock); 4237 4238 tcon_selected = false; 4239 4240 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { 4241 if (tcon->need_reconnect || tcon->need_reopen_files) { 4242 spin_lock(&tcon->tc_lock); 4243 tcon->tc_count++; 4244 spin_unlock(&tcon->tc_lock); 4245 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count, 4246 netfs_trace_tcon_ref_get_reconnect_server); 4247 list_add_tail(&tcon->rlist, &tmp_list); 4248 tcon_selected = true; 4249 } 4250 } 4251 /* 4252 * IPC has the same lifetime as its session and uses its 4253 * refcount. 4254 */ 4255 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) { 4256 list_add_tail(&ses->tcon_ipc->rlist, &tmp_list); 4257 tcon_selected = true; 4258 cifs_smb_ses_inc_refcount(ses); 4259 } 4260 /* 4261 * handle the case where channel needs to reconnect 4262 * binding session, but tcon is healthy (some other channel 4263 * is active) 4264 */ 4265 spin_lock(&ses->chan_lock); 4266 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) { 4267 list_add_tail(&ses->rlist, &tmp_ses_list); 4268 ses_exist = true; 4269 cifs_smb_ses_inc_refcount(ses); 4270 } 4271 spin_unlock(&ses->chan_lock); 4272 } 4273 spin_unlock(&cifs_tcp_ses_lock); 4274 4275 list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) { 4276 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true); 4277 if (!rc) { 4278 cifs_renegotiate_iosize(server, tcon); 4279 cifs_reopen_persistent_handles(tcon); 4280 } else 4281 resched = true; 4282 list_del_init(&tcon->rlist); 4283 if (tcon->ipc) 4284 cifs_put_smb_ses(tcon->ses); 4285 else 4286 cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_reconnect_server); 4287 } 4288 4289 if (!ses_exist) 4290 goto done; 4291 4292 /* allocate a dummy tcon struct used for reconnect */ 4293 tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_reconnect_server); 4294 if (!tcon) { 4295 resched = true; 4296 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) { 4297 list_del_init(&ses->rlist); 4298 cifs_put_smb_ses(ses); 4299 } 4300 goto done; 4301 } 4302 tcon->status = TID_GOOD; 4303 tcon->dummy = true; 4304 4305 /* now reconnect sessions for necessary channels */ 4306 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) { 4307 tcon->ses = ses; 4308 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true); 4309 if (rc) 4310 resched = true; 4311 list_del_init(&ses->rlist); 4312 cifs_put_smb_ses(ses); 4313 } 4314 tconInfoFree(tcon, netfs_trace_tcon_ref_free_reconnect_server); 4315 4316 done: 4317 cifs_dbg(FYI, "Reconnecting tcons and channels finished\n"); 4318 if (resched) 4319 cifs_requeue_server_reconn(server); 4320 mutex_unlock(&pserver->reconnect_mutex); 4321 4322 /* now we can safely release srv struct */ 4323 cifs_put_tcp_session(server, true); 4324 } 4325 4326 int 4327 SMB2_echo(struct TCP_Server_Info *server) 4328 { 4329 struct smb2_echo_req *req; 4330 int rc = 0; 4331 struct kvec iov[1]; 4332 struct smb_rqst rqst = { .rq_iov = iov, 4333 .rq_nvec = 1 }; 4334 unsigned int total_len; 4335 4336 cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id); 4337 4338 spin_lock(&server->srv_lock); 4339 if (server->ops->need_neg && 4340 server->ops->need_neg(server)) { 4341 spin_unlock(&server->srv_lock); 4342 /* No need to send echo on newly established connections */ 4343 cifs_queue_server_reconn(server); 4344 return rc; 4345 } 4346 spin_unlock(&server->srv_lock); 4347 4348 rc = smb2_plain_req_init(SMB2_ECHO, NULL, server, 4349 (void **)&req, &total_len); 4350 if (rc) 4351 return rc; 4352 4353 req->hdr.CreditRequest = cpu_to_le16(1); 4354 4355 iov[0].iov_len = total_len; 4356 iov[0].iov_base = (char *)req; 4357 4358 rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL, 4359 server, CIFS_ECHO_OP, NULL); 4360 if (rc) 4361 cifs_dbg(FYI, "Echo request failed: %d\n", rc); 4362 4363 cifs_small_buf_release(req); 4364 return rc; 4365 } 4366 4367 void 4368 SMB2_flush_free(struct smb_rqst *rqst) 4369 { 4370 if (rqst && rqst->rq_iov) 4371 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 4372 } 4373 4374 int 4375 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst, 4376 struct cifs_tcon *tcon, struct TCP_Server_Info *server, 4377 u64 persistent_fid, u64 volatile_fid) 4378 { 4379 struct smb2_flush_req *req; 4380 struct kvec *iov = rqst->rq_iov; 4381 unsigned int total_len; 4382 int rc; 4383 4384 rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server, 4385 (void **) &req, &total_len); 4386 if (rc) 4387 return rc; 4388 4389 req->PersistentFileId = persistent_fid; 4390 req->VolatileFileId = volatile_fid; 4391 4392 iov[0].iov_base = (char *)req; 4393 iov[0].iov_len = total_len; 4394 4395 return 0; 4396 } 4397 4398 int 4399 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 4400 u64 volatile_fid) 4401 { 4402 struct cifs_ses *ses = tcon->ses; 4403 struct smb_rqst rqst; 4404 struct kvec iov[1]; 4405 struct kvec rsp_iov = {NULL, 0}; 4406 struct TCP_Server_Info *server; 4407 int resp_buftype = CIFS_NO_BUFFER; 4408 int flags = 0; 4409 int rc = 0; 4410 int retries = 0, cur_sleep = 0; 4411 4412 replay_again: 4413 /* reinitialize for possible replay */ 4414 flags = 0; 4415 server = cifs_pick_channel(ses); 4416 4417 cifs_dbg(FYI, "flush\n"); 4418 if (!ses || !(ses->server)) 4419 return smb_EIO(smb_eio_trace_null_pointers); 4420 4421 if (smb3_encryption_required(tcon)) 4422 flags |= CIFS_TRANSFORM_REQ; 4423 4424 memset(&rqst, 0, sizeof(struct smb_rqst)); 4425 memset(&iov, 0, sizeof(iov)); 4426 rqst.rq_iov = iov; 4427 rqst.rq_nvec = 1; 4428 4429 rc = SMB2_flush_init(xid, &rqst, tcon, server, 4430 persistent_fid, volatile_fid); 4431 if (rc) 4432 goto flush_exit; 4433 4434 trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid); 4435 4436 if (retries) { 4437 /* Back-off before retry */ 4438 if (cur_sleep) 4439 msleep(cur_sleep); 4440 smb2_set_replay(server, &rqst); 4441 } 4442 4443 rc = cifs_send_recv(xid, ses, server, 4444 &rqst, &resp_buftype, flags, &rsp_iov); 4445 4446 if (rc != 0) { 4447 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE); 4448 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid, 4449 rc); 4450 } else 4451 trace_smb3_flush_done(xid, persistent_fid, tcon->tid, 4452 ses->Suid); 4453 4454 flush_exit: 4455 SMB2_flush_free(&rqst); 4456 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4457 4458 if (is_replayable_error(rc) && 4459 smb2_should_replay(tcon, &retries, &cur_sleep)) 4460 goto replay_again; 4461 4462 return rc; 4463 } 4464 4465 #ifdef CONFIG_CIFS_SMB_DIRECT 4466 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms) 4467 { 4468 struct TCP_Server_Info *server = io_parms->server; 4469 struct cifs_tcon *tcon = io_parms->tcon; 4470 4471 /* we can only offload if we're connected */ 4472 if (!server || !tcon) 4473 return false; 4474 4475 /* we can only offload on an rdma connection */ 4476 if (!server->rdma || !server->smbd_conn) 4477 return false; 4478 4479 /* we don't support signed offload yet */ 4480 if (server->sign) 4481 return false; 4482 4483 /* we don't support encrypted offload yet */ 4484 if (smb3_encryption_required(tcon)) 4485 return false; 4486 4487 /* offload also has its overhead, so only do it if desired */ 4488 if (io_parms->length < server->rdma_readwrite_threshold) 4489 return false; 4490 4491 return true; 4492 } 4493 #endif /* CONFIG_CIFS_SMB_DIRECT */ 4494 4495 /* 4496 * To form a chain of read requests, any read requests after the first should 4497 * have the end_of_chain boolean set to true. 4498 */ 4499 static int 4500 smb2_new_read_req(void **buf, unsigned int *total_len, 4501 struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata, 4502 unsigned int remaining_bytes, int request_type) 4503 { 4504 int rc = -EACCES; 4505 struct smb2_read_req *req = NULL; 4506 struct smb2_hdr *shdr; 4507 struct TCP_Server_Info *server = io_parms->server; 4508 4509 rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server, 4510 (void **) &req, total_len); 4511 if (rc) 4512 return rc; 4513 4514 if (server == NULL) 4515 return -ECONNABORTED; 4516 4517 shdr = &req->hdr; 4518 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 4519 4520 req->PersistentFileId = io_parms->persistent_fid; 4521 req->VolatileFileId = io_parms->volatile_fid; 4522 req->ReadChannelInfoOffset = 0; /* reserved */ 4523 req->ReadChannelInfoLength = 0; /* reserved */ 4524 req->Channel = 0; /* reserved */ 4525 req->MinimumCount = 0; 4526 req->Length = cpu_to_le32(io_parms->length); 4527 req->Offset = cpu_to_le64(io_parms->offset); 4528 4529 trace_smb3_read_enter(rdata ? rdata->rreq->debug_id : 0, 4530 rdata ? rdata->subreq.debug_index : 0, 4531 rdata ? rdata->xid : 0, 4532 io_parms->persistent_fid, 4533 io_parms->tcon->tid, io_parms->tcon->ses->Suid, 4534 io_parms->offset, io_parms->length); 4535 #ifdef CONFIG_CIFS_SMB_DIRECT 4536 /* 4537 * If we want to do a RDMA write, fill in and append 4538 * smbdirect_buffer_descriptor_v1 to the end of read request 4539 */ 4540 if (rdata && smb3_use_rdma_offload(io_parms)) { 4541 struct smbdirect_buffer_descriptor_v1 *v1; 4542 bool need_invalidate = server->dialect == SMB30_PROT_ID; 4543 4544 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->subreq.io_iter, 4545 true, need_invalidate); 4546 if (!rdata->mr) 4547 return -EAGAIN; 4548 4549 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE; 4550 if (need_invalidate) 4551 req->Channel = SMB2_CHANNEL_RDMA_V1; 4552 req->ReadChannelInfoOffset = 4553 cpu_to_le16(offsetof(struct smb2_read_req, Buffer)); 4554 req->ReadChannelInfoLength = 4555 cpu_to_le16(sizeof(struct smbdirect_buffer_descriptor_v1)); 4556 v1 = (struct smbdirect_buffer_descriptor_v1 *) &req->Buffer[0]; 4557 v1->offset = cpu_to_le64(rdata->mr->mr->iova); 4558 v1->token = cpu_to_le32(rdata->mr->mr->rkey); 4559 v1->length = cpu_to_le32(rdata->mr->mr->length); 4560 4561 *total_len += sizeof(*v1) - 1; 4562 } 4563 #endif 4564 if (request_type & CHAINED_REQUEST) { 4565 if (!(request_type & END_OF_CHAIN)) { 4566 /* next 8-byte aligned request */ 4567 *total_len = ALIGN(*total_len, 8); 4568 shdr->NextCommand = cpu_to_le32(*total_len); 4569 } else /* END_OF_CHAIN */ 4570 shdr->NextCommand = 0; 4571 if (request_type & RELATED_REQUEST) { 4572 shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS; 4573 /* 4574 * Related requests use info from previous read request 4575 * in chain. 4576 */ 4577 shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF); 4578 shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF); 4579 req->PersistentFileId = (u64)-1; 4580 req->VolatileFileId = (u64)-1; 4581 } 4582 } 4583 if (remaining_bytes > io_parms->length) 4584 req->RemainingBytes = cpu_to_le32(remaining_bytes); 4585 else 4586 req->RemainingBytes = 0; 4587 4588 *buf = req; 4589 return rc; 4590 } 4591 4592 static void 4593 smb2_readv_callback(struct TCP_Server_Info *server, struct mid_q_entry *mid) 4594 { 4595 struct cifs_io_subrequest *rdata = mid->callback_data; 4596 struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode); 4597 struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink); 4598 struct smb2_hdr *shdr = (struct smb2_hdr *)rdata->iov[0].iov_base; 4599 struct cifs_credits credits = { 4600 .value = 0, 4601 .instance = 0, 4602 .rreq_debug_id = rdata->rreq->debug_id, 4603 .rreq_debug_index = rdata->subreq.debug_index, 4604 }; 4605 struct smb_rqst rqst = { .rq_iov = &rdata->iov[0], .rq_nvec = 1 }; 4606 unsigned int rreq_debug_id = rdata->rreq->debug_id; 4607 unsigned int subreq_debug_index = rdata->subreq.debug_index; 4608 4609 if (rdata->got_bytes) { 4610 rqst.rq_iter = rdata->subreq.io_iter; 4611 } 4612 4613 WARN_ONCE(rdata->server != server, 4614 "rdata server %p != mid server %p", 4615 rdata->server, server); 4616 4617 cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n", 4618 __func__, mid->mid, mid->mid_state, rdata->result, 4619 rdata->got_bytes, rdata->subreq.len - rdata->subreq.transferred); 4620 4621 switch (mid->mid_state) { 4622 case MID_RESPONSE_RECEIVED: 4623 credits.value = le16_to_cpu(shdr->CreditRequest); 4624 credits.instance = server->reconnect_instance; 4625 /* result already set, check signature */ 4626 if (server->sign && !mid->decrypted) { 4627 int rc; 4628 4629 iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes); 4630 rc = smb2_verify_signature(&rqst, server); 4631 if (rc) { 4632 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n", 4633 rc); 4634 rdata->subreq.error = rc; 4635 rdata->result = rc; 4636 4637 if (is_replayable_error(rc)) { 4638 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_retry_needed); 4639 __set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags); 4640 } else 4641 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_bad); 4642 } else 4643 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress); 4644 } 4645 /* FIXME: should this be counted toward the initiating task? */ 4646 task_io_account_read(rdata->got_bytes); 4647 cifs_stats_bytes_read(tcon, rdata->got_bytes); 4648 break; 4649 case MID_REQUEST_SUBMITTED: 4650 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_req_submitted); 4651 goto do_retry; 4652 case MID_RETRY_NEEDED: 4653 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_retry_needed); 4654 do_retry: 4655 __set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags); 4656 rdata->result = -EAGAIN; 4657 if (server->sign && rdata->got_bytes) 4658 /* reset bytes number since we can not check a sign */ 4659 rdata->got_bytes = 0; 4660 /* FIXME: should this be counted toward the initiating task? */ 4661 task_io_account_read(rdata->got_bytes); 4662 cifs_stats_bytes_read(tcon, rdata->got_bytes); 4663 break; 4664 case MID_RESPONSE_MALFORMED: 4665 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_malformed); 4666 credits.value = le16_to_cpu(shdr->CreditRequest); 4667 credits.instance = server->reconnect_instance; 4668 rdata->result = smb_EIO(smb_eio_trace_read_rsp_malformed); 4669 break; 4670 default: 4671 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_unknown); 4672 rdata->result = smb_EIO1(smb_eio_trace_read_mid_state_unknown, 4673 mid->mid_state); 4674 break; 4675 } 4676 #ifdef CONFIG_CIFS_SMB_DIRECT 4677 /* 4678 * If this rdata has a memory registered, the MR can be freed 4679 * MR needs to be freed as soon as I/O finishes to prevent deadlock 4680 * because they have limited number and are used for future I/Os 4681 */ 4682 if (rdata->mr) { 4683 smbd_deregister_mr(rdata->mr); 4684 rdata->mr = NULL; 4685 } 4686 #endif 4687 if (rdata->result && rdata->result != -ENODATA) { 4688 cifs_stats_fail_inc(tcon, SMB2_READ_HE); 4689 trace_smb3_read_err(rdata->rreq->debug_id, 4690 rdata->subreq.debug_index, 4691 rdata->xid, 4692 rdata->req->cfile->fid.persistent_fid, 4693 tcon->tid, tcon->ses->Suid, 4694 rdata->subreq.start + rdata->subreq.transferred, 4695 rdata->subreq.len - rdata->subreq.transferred, 4696 rdata->result); 4697 } else 4698 trace_smb3_read_done(rdata->rreq->debug_id, 4699 rdata->subreq.debug_index, 4700 rdata->xid, 4701 rdata->req->cfile->fid.persistent_fid, 4702 tcon->tid, tcon->ses->Suid, 4703 rdata->subreq.start + rdata->subreq.transferred, 4704 rdata->got_bytes); 4705 4706 if (rdata->result == -ENODATA) { 4707 __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags); 4708 rdata->result = 0; 4709 } else { 4710 size_t trans = rdata->subreq.transferred + rdata->got_bytes; 4711 if (trans < rdata->subreq.len && 4712 rdata->subreq.start + trans >= ictx->remote_i_size) { 4713 __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags); 4714 rdata->result = 0; 4715 } 4716 if (rdata->got_bytes) 4717 __set_bit(NETFS_SREQ_MADE_PROGRESS, &rdata->subreq.flags); 4718 } 4719 4720 /* see if we need to retry */ 4721 if (is_replayable_error(rdata->result) && 4722 smb2_should_replay(tcon, 4723 &rdata->retries, 4724 &rdata->cur_sleep)) 4725 rdata->replay = true; 4726 4727 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value, 4728 server->credits, server->in_flight, 4729 0, cifs_trace_rw_credits_read_response_clear); 4730 rdata->credits.value = 0; 4731 rdata->subreq.error = rdata->result; 4732 rdata->subreq.transferred += rdata->got_bytes; 4733 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress); 4734 netfs_read_subreq_terminated(&rdata->subreq); 4735 release_mid(server, mid); 4736 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0, 4737 server->credits, server->in_flight, 4738 credits.value, cifs_trace_rw_credits_read_response_add); 4739 add_credits(server, &credits, 0); 4740 } 4741 4742 /* smb2_async_readv - send an async read, and set up mid to handle result */ 4743 int 4744 smb2_async_readv(struct cifs_io_subrequest *rdata) 4745 { 4746 int rc, flags = 0; 4747 char *buf; 4748 struct netfs_io_subrequest *subreq = &rdata->subreq; 4749 struct smb2_hdr *shdr; 4750 struct cifs_io_parms io_parms; 4751 struct smb_rqst rqst = { .rq_iov = rdata->iov, 4752 .rq_nvec = 1 }; 4753 struct TCP_Server_Info *server; 4754 struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink); 4755 unsigned int total_len; 4756 int credit_request; 4757 4758 cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n", 4759 __func__, subreq->start, subreq->len); 4760 4761 if (!rdata->server) 4762 rdata->server = cifs_pick_channel(tcon->ses); 4763 4764 io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink); 4765 io_parms.server = server = rdata->server; 4766 io_parms.offset = subreq->start + subreq->transferred; 4767 io_parms.length = subreq->len - subreq->transferred; 4768 io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid; 4769 io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid; 4770 io_parms.pid = rdata->req->pid; 4771 4772 rc = smb2_new_read_req( 4773 (void **) &buf, &total_len, &io_parms, rdata, 0, 0); 4774 if (rc) 4775 goto out; 4776 4777 if (smb3_encryption_required(io_parms.tcon)) 4778 flags |= CIFS_TRANSFORM_REQ; 4779 4780 rdata->iov[0].iov_base = buf; 4781 rdata->iov[0].iov_len = total_len; 4782 rdata->got_bytes = 0; 4783 rdata->result = 0; 4784 4785 shdr = (struct smb2_hdr *)buf; 4786 4787 if (rdata->replay) { 4788 /* Back-off before retry */ 4789 if (rdata->cur_sleep) 4790 msleep(rdata->cur_sleep); 4791 smb2_set_replay(server, &rqst); 4792 } 4793 4794 if (rdata->credits.value > 0) { 4795 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(io_parms.length, 4796 SMB2_MAX_BUFFER_SIZE)); 4797 credit_request = le16_to_cpu(shdr->CreditCharge) + 8; 4798 if (server->credits >= server->max_credits) 4799 shdr->CreditRequest = cpu_to_le16(0); 4800 else 4801 shdr->CreditRequest = cpu_to_le16( 4802 min_t(int, server->max_credits - 4803 server->credits, credit_request)); 4804 4805 rc = adjust_credits(server, rdata, cifs_trace_rw_credits_call_readv_adjust); 4806 if (rc) 4807 goto async_readv_out; 4808 4809 flags |= CIFS_HAS_CREDITS; 4810 } 4811 4812 rc = cifs_call_async(server, &rqst, 4813 cifs_readv_receive, smb2_readv_callback, 4814 smb3_handle_read_data, rdata, flags, 4815 &rdata->credits); 4816 if (rc) { 4817 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE); 4818 trace_smb3_read_err(rdata->rreq->debug_id, 4819 subreq->debug_index, 4820 rdata->xid, io_parms.persistent_fid, 4821 io_parms.tcon->tid, 4822 io_parms.tcon->ses->Suid, 4823 io_parms.offset, 4824 subreq->len - subreq->transferred, rc); 4825 } 4826 4827 async_readv_out: 4828 cifs_small_buf_release(buf); 4829 4830 out: 4831 /* if the send error is retryable, let netfs know about it */ 4832 if (is_replayable_error(rc) && 4833 smb2_should_replay(tcon, 4834 &rdata->retries, 4835 &rdata->cur_sleep)) { 4836 trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_retry_needed); 4837 __set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags); 4838 } 4839 4840 return rc; 4841 } 4842 4843 int 4844 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms, 4845 unsigned int *nbytes, char **buf, int *buf_type) 4846 { 4847 struct smb_rqst rqst; 4848 int resp_buftype, rc; 4849 struct smb2_read_req *req = NULL; 4850 struct smb2_read_rsp *rsp = NULL; 4851 struct kvec iov[1]; 4852 struct kvec rsp_iov; 4853 unsigned int total_len; 4854 int flags = CIFS_LOG_ERROR; 4855 struct cifs_ses *ses = io_parms->tcon->ses; 4856 4857 if (!io_parms->server) 4858 io_parms->server = cifs_pick_channel(io_parms->tcon->ses); 4859 4860 *nbytes = 0; 4861 rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0); 4862 if (rc) 4863 return rc; 4864 4865 if (smb3_encryption_required(io_parms->tcon)) 4866 flags |= CIFS_TRANSFORM_REQ; 4867 4868 iov[0].iov_base = (char *)req; 4869 iov[0].iov_len = total_len; 4870 4871 memset(&rqst, 0, sizeof(struct smb_rqst)); 4872 rqst.rq_iov = iov; 4873 rqst.rq_nvec = 1; 4874 4875 rc = cifs_send_recv(xid, ses, io_parms->server, 4876 &rqst, &resp_buftype, flags, &rsp_iov); 4877 rsp = (struct smb2_read_rsp *)rsp_iov.iov_base; 4878 4879 if (rc) { 4880 if (rc != -ENODATA) { 4881 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE); 4882 cifs_dbg(VFS, "Send error in read = %d\n", rc); 4883 trace_smb3_read_err(0, 0, xid, 4884 req->PersistentFileId, 4885 io_parms->tcon->tid, ses->Suid, 4886 io_parms->offset, io_parms->length, 4887 rc); 4888 } else 4889 trace_smb3_read_done(0, 0, xid, 4890 req->PersistentFileId, io_parms->tcon->tid, 4891 ses->Suid, io_parms->offset, 0); 4892 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4893 cifs_small_buf_release(req); 4894 return rc == -ENODATA ? 0 : rc; 4895 } else 4896 trace_smb3_read_done(0, 0, xid, 4897 req->PersistentFileId, 4898 io_parms->tcon->tid, ses->Suid, 4899 io_parms->offset, io_parms->length); 4900 4901 cifs_small_buf_release(req); 4902 4903 *nbytes = le32_to_cpu(rsp->DataLength); 4904 if ((*nbytes > CIFS_MAX_MSGSIZE) || 4905 (*nbytes > io_parms->length)) { 4906 cifs_dbg(FYI, "bad length %d for count %d\n", 4907 *nbytes, io_parms->length); 4908 rc = smb_EIO2(smb_eio_trace_read_overlarge, 4909 *nbytes, io_parms->length); 4910 *nbytes = 0; 4911 } 4912 4913 if (*buf) { 4914 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes); 4915 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 4916 } else if (resp_buftype != CIFS_NO_BUFFER) { 4917 *buf = rsp_iov.iov_base; 4918 if (resp_buftype == CIFS_SMALL_BUFFER) 4919 *buf_type = CIFS_SMALL_BUFFER; 4920 else if (resp_buftype == CIFS_LARGE_BUFFER) 4921 *buf_type = CIFS_LARGE_BUFFER; 4922 } 4923 return rc; 4924 } 4925 4926 /* 4927 * Check the mid_state and signature on received buffer (if any), and queue the 4928 * workqueue completion task. 4929 */ 4930 static void 4931 smb2_writev_callback(struct TCP_Server_Info *server, struct mid_q_entry *mid) 4932 { 4933 struct cifs_io_subrequest *wdata = mid->callback_data; 4934 struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink); 4935 struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; 4936 struct cifs_credits credits = { 4937 .value = 0, 4938 .instance = 0, 4939 .rreq_debug_id = wdata->rreq->debug_id, 4940 .rreq_debug_index = wdata->subreq.debug_index, 4941 }; 4942 unsigned int rreq_debug_id = wdata->rreq->debug_id; 4943 unsigned int subreq_debug_index = wdata->subreq.debug_index; 4944 ssize_t result = 0; 4945 size_t written; 4946 4947 WARN_ONCE(wdata->server != server, 4948 "wdata server %p != mid server %p", 4949 wdata->server, server); 4950 4951 switch (mid->mid_state) { 4952 case MID_RESPONSE_RECEIVED: 4953 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 4954 credits.instance = server->reconnect_instance; 4955 result = smb2_check_receive(mid, server, 0); 4956 if (result != 0) { 4957 if (is_replayable_error(result)) { 4958 trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_retry_needed); 4959 __set_bit(NETFS_SREQ_NEED_RETRY, &wdata->subreq.flags); 4960 } else { 4961 wdata->subreq.error = result; 4962 trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_bad); 4963 } 4964 break; 4965 } 4966 trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_progress); 4967 4968 written = le32_to_cpu(rsp->DataLength); 4969 /* 4970 * Mask off high 16 bits when bytes written as returned 4971 * by the server is greater than bytes requested by the 4972 * client. OS/2 servers are known to set incorrect 4973 * CountHigh values. 4974 */ 4975 if (written > wdata->subreq.len) 4976 written &= 0xFFFF; 4977 4978 cifs_stats_bytes_written(tcon, written); 4979 4980 if (written < wdata->subreq.len) { 4981 result = -ENOSPC; 4982 } else if (written > 0) { 4983 wdata->subreq.len = written; 4984 __set_bit(NETFS_SREQ_MADE_PROGRESS, &wdata->subreq.flags); 4985 } 4986 break; 4987 case MID_REQUEST_SUBMITTED: 4988 trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_req_submitted); 4989 __set_bit(NETFS_SREQ_NEED_RETRY, &wdata->subreq.flags); 4990 result = -EAGAIN; 4991 break; 4992 case MID_RETRY_NEEDED: 4993 trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_retry_needed); 4994 __set_bit(NETFS_SREQ_NEED_RETRY, &wdata->subreq.flags); 4995 result = -EAGAIN; 4996 break; 4997 case MID_RESPONSE_MALFORMED: 4998 trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_malformed); 4999 credits.value = le16_to_cpu(rsp->hdr.CreditRequest); 5000 credits.instance = server->reconnect_instance; 5001 result = smb_EIO(smb_eio_trace_write_rsp_malformed); 5002 break; 5003 default: 5004 trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_unknown); 5005 result = smb_EIO1(smb_eio_trace_write_mid_state_unknown, 5006 mid->mid_state); 5007 break; 5008 } 5009 #ifdef CONFIG_CIFS_SMB_DIRECT 5010 /* 5011 * If this wdata has a memory registered, the MR can be freed 5012 * The number of MRs available is limited, it's important to recover 5013 * used MR as soon as I/O is finished. Hold MR longer in the later 5014 * I/O process can possibly result in I/O deadlock due to lack of MR 5015 * to send request on I/O retry 5016 */ 5017 if (wdata->mr) { 5018 smbd_deregister_mr(wdata->mr); 5019 wdata->mr = NULL; 5020 } 5021 #endif 5022 if (result) { 5023 wdata->result = result; 5024 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); 5025 trace_smb3_write_err(wdata->rreq->debug_id, 5026 wdata->subreq.debug_index, 5027 wdata->xid, 5028 wdata->req->cfile->fid.persistent_fid, 5029 tcon->tid, tcon->ses->Suid, wdata->subreq.start, 5030 wdata->subreq.len, wdata->result); 5031 if (wdata->result == -ENOSPC) 5032 pr_warn_once("Out of space writing to %s\n", 5033 tcon->tree_name); 5034 } else 5035 trace_smb3_write_done(wdata->rreq->debug_id, 5036 wdata->subreq.debug_index, 5037 wdata->xid, 5038 wdata->req->cfile->fid.persistent_fid, 5039 tcon->tid, tcon->ses->Suid, 5040 wdata->subreq.start, wdata->subreq.len); 5041 5042 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, wdata->credits.value, 5043 server->credits, server->in_flight, 5044 0, cifs_trace_rw_credits_write_response_clear); 5045 wdata->credits.value = 0; 5046 5047 /* see if we need to retry */ 5048 if (is_replayable_error(wdata->result) && 5049 smb2_should_replay(tcon, 5050 &wdata->retries, 5051 &wdata->cur_sleep)) 5052 wdata->replay = true; 5053 5054 cifs_write_subrequest_terminated(wdata, result ?: written); 5055 release_mid(server, mid); 5056 trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0, 5057 server->credits, server->in_flight, 5058 credits.value, cifs_trace_rw_credits_write_response_add); 5059 add_credits(server, &credits, 0); 5060 } 5061 5062 /* smb2_async_writev - send an async write, and set up mid to handle result */ 5063 void 5064 smb2_async_writev(struct cifs_io_subrequest *wdata) 5065 { 5066 int rc = -EACCES, flags = 0; 5067 struct smb2_write_req *req = NULL; 5068 struct smb2_hdr *shdr; 5069 struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink); 5070 struct TCP_Server_Info *server = wdata->server; 5071 struct kvec iov[1]; 5072 struct smb_rqst rqst = { }; 5073 unsigned int total_len, xid = wdata->xid; 5074 struct cifs_io_parms _io_parms; 5075 struct cifs_io_parms *io_parms = NULL; 5076 int credit_request; 5077 5078 /* 5079 * in future we may get cifs_io_parms passed in from the caller, 5080 * but for now we construct it here... 5081 */ 5082 _io_parms = (struct cifs_io_parms) { 5083 .tcon = tcon, 5084 .server = server, 5085 .offset = wdata->subreq.start, 5086 .length = wdata->subreq.len, 5087 .persistent_fid = wdata->req->cfile->fid.persistent_fid, 5088 .volatile_fid = wdata->req->cfile->fid.volatile_fid, 5089 .pid = wdata->req->pid, 5090 }; 5091 io_parms = &_io_parms; 5092 5093 rc = smb2_plain_req_init(SMB2_WRITE, tcon, server, 5094 (void **) &req, &total_len); 5095 if (rc) 5096 goto out; 5097 5098 rqst.rq_iov = iov; 5099 rqst.rq_iter = wdata->subreq.io_iter; 5100 5101 rqst.rq_iov[0].iov_len = total_len - 1; 5102 rqst.rq_iov[0].iov_base = (char *)req; 5103 rqst.rq_nvec += 1; 5104 5105 if (smb3_encryption_required(tcon)) 5106 flags |= CIFS_TRANSFORM_REQ; 5107 5108 shdr = (struct smb2_hdr *)req; 5109 shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 5110 5111 req->PersistentFileId = io_parms->persistent_fid; 5112 req->VolatileFileId = io_parms->volatile_fid; 5113 req->WriteChannelInfoOffset = 0; 5114 req->WriteChannelInfoLength = 0; 5115 req->Channel = SMB2_CHANNEL_NONE; 5116 req->Length = cpu_to_le32(io_parms->length); 5117 req->Offset = cpu_to_le64(io_parms->offset); 5118 req->DataOffset = cpu_to_le16( 5119 offsetof(struct smb2_write_req, Buffer)); 5120 req->RemainingBytes = 0; 5121 5122 trace_smb3_write_enter(wdata->rreq->debug_id, 5123 wdata->subreq.debug_index, 5124 wdata->xid, 5125 io_parms->persistent_fid, 5126 io_parms->tcon->tid, 5127 io_parms->tcon->ses->Suid, 5128 io_parms->offset, 5129 io_parms->length); 5130 5131 #ifdef CONFIG_CIFS_SMB_DIRECT 5132 /* 5133 * If we want to do a server RDMA read, fill in and append 5134 * smbdirect_buffer_descriptor_v1 to the end of write request 5135 */ 5136 if (smb3_use_rdma_offload(io_parms)) { 5137 struct smbdirect_buffer_descriptor_v1 *v1; 5138 bool need_invalidate = server->dialect == SMB30_PROT_ID; 5139 5140 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->subreq.io_iter, 5141 false, need_invalidate); 5142 if (!wdata->mr) { 5143 rc = -EAGAIN; 5144 goto async_writev_out; 5145 } 5146 /* For RDMA read, I/O size is in RemainingBytes not in Length */ 5147 req->RemainingBytes = req->Length; 5148 req->Length = 0; 5149 req->DataOffset = 0; 5150 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE; 5151 if (need_invalidate) 5152 req->Channel = SMB2_CHANNEL_RDMA_V1; 5153 req->WriteChannelInfoOffset = 5154 cpu_to_le16(offsetof(struct smb2_write_req, Buffer)); 5155 req->WriteChannelInfoLength = 5156 cpu_to_le16(sizeof(struct smbdirect_buffer_descriptor_v1)); 5157 v1 = (struct smbdirect_buffer_descriptor_v1 *) &req->Buffer[0]; 5158 v1->offset = cpu_to_le64(wdata->mr->mr->iova); 5159 v1->token = cpu_to_le32(wdata->mr->mr->rkey); 5160 v1->length = cpu_to_le32(wdata->mr->mr->length); 5161 5162 rqst.rq_iov[0].iov_len += sizeof(*v1); 5163 5164 /* 5165 * We keep wdata->subreq.io_iter, 5166 * but we have to truncate rqst.rq_iter 5167 */ 5168 iov_iter_truncate(&rqst.rq_iter, 0); 5169 } 5170 #endif 5171 5172 if (wdata->replay) { 5173 /* Back-off before retry */ 5174 if (wdata->cur_sleep) 5175 msleep(wdata->cur_sleep); 5176 smb2_set_replay(server, &rqst); 5177 } 5178 5179 cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n", 5180 io_parms->offset, io_parms->length, iov_iter_count(&wdata->subreq.io_iter)); 5181 5182 if (wdata->credits.value > 0) { 5183 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->subreq.len, 5184 SMB2_MAX_BUFFER_SIZE)); 5185 credit_request = le16_to_cpu(shdr->CreditCharge) + 8; 5186 if (server->credits >= server->max_credits) 5187 shdr->CreditRequest = cpu_to_le16(0); 5188 else 5189 shdr->CreditRequest = cpu_to_le16( 5190 min_t(int, server->max_credits - 5191 server->credits, credit_request)); 5192 5193 rc = adjust_credits(server, wdata, cifs_trace_rw_credits_call_writev_adjust); 5194 if (rc) 5195 goto async_writev_out; 5196 5197 flags |= CIFS_HAS_CREDITS; 5198 } 5199 5200 /* XXX: compression + encryption is unsupported for now */ 5201 if (((flags & CIFS_TRANSFORM_REQ) != CIFS_TRANSFORM_REQ) && should_compress(tcon, &rqst)) 5202 flags |= CIFS_COMPRESS_REQ; 5203 5204 rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL, 5205 wdata, flags, &wdata->credits); 5206 /* Can't touch wdata if rc == 0 */ 5207 if (rc) { 5208 trace_smb3_write_err(wdata->rreq->debug_id, 5209 wdata->subreq.debug_index, 5210 xid, 5211 io_parms->persistent_fid, 5212 io_parms->tcon->tid, 5213 io_parms->tcon->ses->Suid, 5214 io_parms->offset, 5215 io_parms->length, 5216 rc); 5217 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); 5218 } 5219 5220 async_writev_out: 5221 cifs_small_buf_release(req); 5222 out: 5223 /* if the send error is retryable, let netfs know about it */ 5224 if (is_replayable_error(rc) && 5225 smb2_should_replay(tcon, 5226 &wdata->retries, 5227 &wdata->cur_sleep)) { 5228 wdata->replay = true; 5229 trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_retry_needed); 5230 __set_bit(NETFS_SREQ_NEED_RETRY, &wdata->subreq.flags); 5231 } 5232 5233 if (rc) { 5234 trace_smb3_rw_credits(wdata->rreq->debug_id, 5235 wdata->subreq.debug_index, 5236 wdata->credits.value, 5237 server->credits, server->in_flight, 5238 -(int)wdata->credits.value, 5239 cifs_trace_rw_credits_write_response_clear); 5240 add_credits_and_wake_if(wdata->server, &wdata->credits, 0); 5241 cifs_write_subrequest_terminated(wdata, rc); 5242 } 5243 } 5244 5245 /* 5246 * SMB2_write function gets iov pointer to kvec array with n_vec as a length. 5247 * The length field from io_parms must be at least 1 and indicates a number of 5248 * elements with data to write that begins with position 1 in iov array. All 5249 * data length is specified by count. 5250 */ 5251 int 5252 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms, 5253 unsigned int *nbytes, struct kvec *iov, int n_vec) 5254 { 5255 struct smb_rqst rqst; 5256 int rc = 0; 5257 struct smb2_write_req *req = NULL; 5258 struct smb2_write_rsp *rsp = NULL; 5259 int resp_buftype; 5260 struct kvec rsp_iov; 5261 int flags = 0; 5262 unsigned int total_len; 5263 struct TCP_Server_Info *server; 5264 int retries = 0, cur_sleep = 0; 5265 5266 replay_again: 5267 /* reinitialize for possible replay */ 5268 flags = 0; 5269 *nbytes = 0; 5270 if (!io_parms->server) 5271 io_parms->server = cifs_pick_channel(io_parms->tcon->ses); 5272 server = io_parms->server; 5273 if (server == NULL) 5274 return -ECONNABORTED; 5275 5276 if (n_vec < 1) 5277 return rc; 5278 5279 rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server, 5280 (void **) &req, &total_len); 5281 if (rc) 5282 return rc; 5283 5284 if (smb3_encryption_required(io_parms->tcon)) 5285 flags |= CIFS_TRANSFORM_REQ; 5286 5287 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid); 5288 5289 req->PersistentFileId = io_parms->persistent_fid; 5290 req->VolatileFileId = io_parms->volatile_fid; 5291 req->WriteChannelInfoOffset = 0; 5292 req->WriteChannelInfoLength = 0; 5293 req->Channel = 0; 5294 req->Length = cpu_to_le32(io_parms->length); 5295 req->Offset = cpu_to_le64(io_parms->offset); 5296 req->DataOffset = cpu_to_le16( 5297 offsetof(struct smb2_write_req, Buffer)); 5298 req->RemainingBytes = 0; 5299 5300 trace_smb3_write_enter(0, 0, xid, io_parms->persistent_fid, 5301 io_parms->tcon->tid, io_parms->tcon->ses->Suid, 5302 io_parms->offset, io_parms->length); 5303 5304 iov[0].iov_base = (char *)req; 5305 /* 1 for Buffer */ 5306 iov[0].iov_len = total_len - 1; 5307 5308 memset(&rqst, 0, sizeof(struct smb_rqst)); 5309 rqst.rq_iov = iov; 5310 rqst.rq_nvec = n_vec + 1; 5311 5312 if (retries) { 5313 /* Back-off before retry */ 5314 if (cur_sleep) 5315 msleep(cur_sleep); 5316 smb2_set_replay(server, &rqst); 5317 } 5318 5319 rc = cifs_send_recv(xid, io_parms->tcon->ses, server, 5320 &rqst, 5321 &resp_buftype, flags, &rsp_iov); 5322 rsp = (struct smb2_write_rsp *)rsp_iov.iov_base; 5323 5324 if (rc) { 5325 trace_smb3_write_err(0, 0, xid, 5326 req->PersistentFileId, 5327 io_parms->tcon->tid, 5328 io_parms->tcon->ses->Suid, 5329 io_parms->offset, io_parms->length, rc); 5330 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE); 5331 cifs_dbg(VFS, "Send error in write = %d\n", rc); 5332 } else { 5333 *nbytes = le32_to_cpu(rsp->DataLength); 5334 cifs_stats_bytes_written(io_parms->tcon, *nbytes); 5335 trace_smb3_write_done(0, 0, xid, 5336 req->PersistentFileId, 5337 io_parms->tcon->tid, 5338 io_parms->tcon->ses->Suid, 5339 io_parms->offset, *nbytes); 5340 } 5341 5342 cifs_small_buf_release(req); 5343 free_rsp_buf(resp_buftype, rsp); 5344 5345 if (is_replayable_error(rc) && 5346 smb2_should_replay(io_parms->tcon, &retries, &cur_sleep)) 5347 goto replay_again; 5348 5349 return rc; 5350 } 5351 5352 int posix_info_sid_size(const void *beg, const void *end) 5353 { 5354 size_t subauth; 5355 int total; 5356 5357 if (beg + 1 > end) 5358 return -1; 5359 5360 subauth = *(u8 *)(beg+1); 5361 if (subauth < 1 || subauth > 15) 5362 return -1; 5363 5364 total = 1 + 1 + 6 + 4*subauth; 5365 if (beg + total > end) 5366 return -1; 5367 5368 return total; 5369 } 5370 5371 int posix_info_parse(const void *beg, const void *end, 5372 struct smb2_posix_info_parsed *out) 5373 5374 { 5375 int total_len = 0; 5376 int owner_len, group_len; 5377 int name_len; 5378 const void *owner_sid; 5379 const void *group_sid; 5380 const void *name; 5381 5382 /* if no end bound given, assume payload to be correct */ 5383 if (!end) { 5384 const struct smb2_posix_info *p = beg; 5385 5386 end = beg + le32_to_cpu(p->NextEntryOffset); 5387 /* last element will have a 0 offset, pick a sensible bound */ 5388 if (end == beg) 5389 end += 0xFFFF; 5390 } 5391 5392 /* check base buf */ 5393 if (beg + sizeof(struct smb2_posix_info) > end) 5394 return -1; 5395 total_len = sizeof(struct smb2_posix_info); 5396 5397 /* check owner sid */ 5398 owner_sid = beg + total_len; 5399 owner_len = posix_info_sid_size(owner_sid, end); 5400 if (owner_len < 0) 5401 return -1; 5402 total_len += owner_len; 5403 5404 /* check group sid */ 5405 group_sid = beg + total_len; 5406 group_len = posix_info_sid_size(group_sid, end); 5407 if (group_len < 0) 5408 return -1; 5409 total_len += group_len; 5410 5411 /* check name len */ 5412 if (beg + total_len + 4 > end) 5413 return -1; 5414 name_len = le32_to_cpu(*(__le32 *)(beg + total_len)); 5415 if (name_len < 1 || name_len > 0xFFFF) 5416 return -1; 5417 total_len += 4; 5418 5419 /* check name */ 5420 name = beg + total_len; 5421 if (name + name_len > end) 5422 return -1; 5423 total_len += name_len; 5424 5425 if (out) { 5426 out->base = beg; 5427 out->size = total_len; 5428 out->name_len = name_len; 5429 out->name = name; 5430 memcpy(&out->owner, owner_sid, owner_len); 5431 memcpy(&out->group, group_sid, group_len); 5432 } 5433 return total_len; 5434 } 5435 5436 static int posix_info_extra_size(const void *beg, const void *end) 5437 { 5438 int len = posix_info_parse(beg, end, NULL); 5439 5440 if (len < 0) 5441 return -1; 5442 return len - sizeof(struct smb2_posix_info); 5443 } 5444 5445 static unsigned int 5446 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry, 5447 size_t size) 5448 { 5449 int len; 5450 unsigned int entrycount = 0; 5451 unsigned int next_offset = 0; 5452 char *entryptr; 5453 FILE_DIRECTORY_INFO *dir_info; 5454 5455 if (bufstart == NULL) 5456 return 0; 5457 5458 entryptr = bufstart; 5459 5460 while (1) { 5461 if (entryptr + next_offset < entryptr || 5462 entryptr + next_offset > end_of_buf || 5463 entryptr + next_offset + size > end_of_buf) { 5464 cifs_dbg(VFS, "malformed search entry would overflow\n"); 5465 break; 5466 } 5467 5468 entryptr = entryptr + next_offset; 5469 dir_info = (FILE_DIRECTORY_INFO *)entryptr; 5470 5471 if (infotype == SMB_FIND_FILE_POSIX_INFO) 5472 len = posix_info_extra_size(entryptr, end_of_buf); 5473 else 5474 len = le32_to_cpu(dir_info->FileNameLength); 5475 5476 if (len < 0 || 5477 entryptr + len < entryptr || 5478 entryptr + len > end_of_buf || 5479 entryptr + len + size > end_of_buf) { 5480 cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n", 5481 end_of_buf); 5482 break; 5483 } 5484 5485 *lastentry = entryptr; 5486 entrycount++; 5487 5488 next_offset = le32_to_cpu(dir_info->NextEntryOffset); 5489 if (!next_offset) 5490 break; 5491 } 5492 5493 return entrycount; 5494 } 5495 5496 /* 5497 * Readdir/FindFirst 5498 */ 5499 int SMB2_query_directory_init(const unsigned int xid, 5500 struct cifs_tcon *tcon, 5501 struct TCP_Server_Info *server, 5502 struct smb_rqst *rqst, 5503 u64 persistent_fid, u64 volatile_fid, 5504 int index, int info_level) 5505 { 5506 struct smb2_query_directory_req *req; 5507 unsigned char *bufptr; 5508 __le16 asteriks = cpu_to_le16('*'); 5509 unsigned int output_size = CIFSMaxBufSize - 5510 MAX_SMB2_CREATE_RESPONSE_SIZE - 5511 MAX_SMB2_CLOSE_RESPONSE_SIZE; 5512 unsigned int total_len; 5513 struct kvec *iov = rqst->rq_iov; 5514 int len, rc; 5515 5516 rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server, 5517 (void **) &req, &total_len); 5518 if (rc) 5519 return rc; 5520 5521 switch (info_level) { 5522 case SMB_FIND_FILE_DIRECTORY_INFO: 5523 req->FileInformationClass = FILE_DIRECTORY_INFORMATION; 5524 break; 5525 case SMB_FIND_FILE_ID_FULL_DIR_INFO: 5526 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION; 5527 break; 5528 case SMB_FIND_FILE_POSIX_INFO: 5529 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO; 5530 break; 5531 case SMB_FIND_FILE_FULL_DIRECTORY_INFO: 5532 req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION; 5533 break; 5534 default: 5535 cifs_tcon_dbg(VFS, "info level %u isn't supported\n", 5536 info_level); 5537 return -EINVAL; 5538 } 5539 5540 req->FileIndex = cpu_to_le32(index); 5541 req->PersistentFileId = persistent_fid; 5542 req->VolatileFileId = volatile_fid; 5543 5544 len = 0x2; 5545 bufptr = req->Buffer; 5546 memcpy(bufptr, &asteriks, len); 5547 5548 req->FileNameOffset = 5549 cpu_to_le16(sizeof(struct smb2_query_directory_req)); 5550 req->FileNameLength = cpu_to_le16(len); 5551 /* 5552 * BB could be 30 bytes or so longer if we used SMB2 specific 5553 * buffer lengths, but this is safe and close enough. 5554 */ 5555 output_size = min_t(unsigned int, output_size, server->maxBuf); 5556 output_size = min_t(unsigned int, output_size, 2 << 15); 5557 req->OutputBufferLength = cpu_to_le32(output_size); 5558 5559 iov[0].iov_base = (char *)req; 5560 /* 1 for Buffer */ 5561 iov[0].iov_len = total_len - 1; 5562 5563 iov[1].iov_base = (char *)(req->Buffer); 5564 iov[1].iov_len = len; 5565 5566 trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid, 5567 tcon->ses->Suid, index, output_size); 5568 5569 return 0; 5570 } 5571 5572 void SMB2_query_directory_free(struct smb_rqst *rqst) 5573 { 5574 if (rqst && rqst->rq_iov) { 5575 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */ 5576 } 5577 } 5578 5579 int 5580 smb2_parse_query_directory(struct cifs_tcon *tcon, 5581 struct kvec *rsp_iov, 5582 int resp_buftype, 5583 struct cifs_search_info *srch_inf) 5584 { 5585 struct smb2_query_directory_rsp *rsp; 5586 size_t info_buf_size; 5587 char *end_of_smb; 5588 int rc; 5589 5590 rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base; 5591 5592 switch (srch_inf->info_level) { 5593 case SMB_FIND_FILE_DIRECTORY_INFO: 5594 info_buf_size = sizeof(FILE_DIRECTORY_INFO); 5595 break; 5596 case SMB_FIND_FILE_ID_FULL_DIR_INFO: 5597 info_buf_size = sizeof(FILE_ID_FULL_DIR_INFO); 5598 break; 5599 case SMB_FIND_FILE_POSIX_INFO: 5600 /* note that posix payload are variable size */ 5601 info_buf_size = sizeof(struct smb2_posix_info); 5602 break; 5603 case SMB_FIND_FILE_FULL_DIRECTORY_INFO: 5604 info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO); 5605 break; 5606 default: 5607 cifs_tcon_dbg(VFS, "info level %u isn't supported\n", 5608 srch_inf->info_level); 5609 return -EINVAL; 5610 } 5611 5612 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 5613 le32_to_cpu(rsp->OutputBufferLength), rsp_iov, 5614 info_buf_size); 5615 if (rc) { 5616 cifs_tcon_dbg(VFS, "bad info payload"); 5617 return rc; 5618 } 5619 5620 srch_inf->unicode = true; 5621 5622 if (srch_inf->ntwrk_buf_start) { 5623 if (srch_inf->smallBuf) 5624 cifs_small_buf_release(srch_inf->ntwrk_buf_start); 5625 else 5626 cifs_buf_release(srch_inf->ntwrk_buf_start); 5627 } 5628 srch_inf->ntwrk_buf_start = (char *)rsp; 5629 srch_inf->srch_entries_start = srch_inf->last_entry = 5630 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset); 5631 end_of_smb = rsp_iov->iov_len + (char *)rsp; 5632 5633 srch_inf->entries_in_buffer = num_entries( 5634 srch_inf->info_level, 5635 srch_inf->srch_entries_start, 5636 end_of_smb, 5637 &srch_inf->last_entry, 5638 info_buf_size); 5639 5640 srch_inf->index_of_last_entry += srch_inf->entries_in_buffer; 5641 cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n", 5642 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry, 5643 srch_inf->srch_entries_start, srch_inf->last_entry); 5644 if (resp_buftype == CIFS_LARGE_BUFFER) 5645 srch_inf->smallBuf = false; 5646 else if (resp_buftype == CIFS_SMALL_BUFFER) 5647 srch_inf->smallBuf = true; 5648 else 5649 cifs_tcon_dbg(VFS, "Invalid search buffer type\n"); 5650 5651 return 0; 5652 } 5653 5654 int 5655 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, 5656 u64 persistent_fid, u64 volatile_fid, int index, 5657 struct cifs_search_info *srch_inf) 5658 { 5659 struct smb_rqst rqst; 5660 struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE]; 5661 struct smb2_query_directory_rsp *rsp = NULL; 5662 int resp_buftype = CIFS_NO_BUFFER; 5663 struct kvec rsp_iov; 5664 int rc = 0; 5665 struct cifs_ses *ses = tcon->ses; 5666 struct TCP_Server_Info *server; 5667 int flags = 0; 5668 int retries = 0, cur_sleep = 0; 5669 5670 replay_again: 5671 /* reinitialize for possible replay */ 5672 flags = 0; 5673 server = cifs_pick_channel(ses); 5674 5675 if (!ses || !(ses->server)) 5676 return smb_EIO(smb_eio_trace_null_pointers); 5677 5678 if (smb3_encryption_required(tcon)) 5679 flags |= CIFS_TRANSFORM_REQ; 5680 5681 memset(&rqst, 0, sizeof(struct smb_rqst)); 5682 memset(&iov, 0, sizeof(iov)); 5683 rqst.rq_iov = iov; 5684 rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE; 5685 5686 rc = SMB2_query_directory_init(xid, tcon, server, 5687 &rqst, persistent_fid, 5688 volatile_fid, index, 5689 srch_inf->info_level); 5690 if (rc) 5691 goto qdir_exit; 5692 5693 if (retries) { 5694 /* Back-off before retry */ 5695 if (cur_sleep) 5696 msleep(cur_sleep); 5697 smb2_set_replay(server, &rqst); 5698 } 5699 5700 rc = cifs_send_recv(xid, ses, server, 5701 &rqst, &resp_buftype, flags, &rsp_iov); 5702 rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base; 5703 5704 if (rc) { 5705 if (rc == -ENODATA && 5706 rsp->hdr.Status == STATUS_NO_MORE_FILES) { 5707 trace_smb3_query_dir_done(xid, persistent_fid, 5708 tcon->tid, tcon->ses->Suid, index, 0); 5709 srch_inf->endOfSearch = true; 5710 rc = 0; 5711 } else { 5712 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid, 5713 tcon->ses->Suid, index, 0, rc); 5714 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE); 5715 } 5716 goto qdir_exit; 5717 } 5718 5719 rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype, 5720 srch_inf); 5721 if (rc) { 5722 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid, 5723 tcon->ses->Suid, index, 0, rc); 5724 goto qdir_exit; 5725 } 5726 resp_buftype = CIFS_NO_BUFFER; 5727 5728 trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid, 5729 tcon->ses->Suid, index, srch_inf->entries_in_buffer); 5730 5731 qdir_exit: 5732 SMB2_query_directory_free(&rqst); 5733 free_rsp_buf(resp_buftype, rsp); 5734 5735 if (is_replayable_error(rc) && 5736 smb2_should_replay(tcon, &retries, &cur_sleep)) 5737 goto replay_again; 5738 5739 return rc; 5740 } 5741 5742 int 5743 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server, 5744 struct smb_rqst *rqst, 5745 u64 persistent_fid, u64 volatile_fid, u32 pid, 5746 u8 info_class, u8 info_type, u32 additional_info, 5747 void **data, unsigned int *size) 5748 { 5749 struct smb2_set_info_req *req; 5750 struct kvec *iov = rqst->rq_iov; 5751 unsigned int i, total_len; 5752 int rc; 5753 5754 rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server, 5755 (void **) &req, &total_len); 5756 if (rc) 5757 return rc; 5758 5759 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid); 5760 req->InfoType = info_type; 5761 req->FileInfoClass = info_class; 5762 req->PersistentFileId = persistent_fid; 5763 req->VolatileFileId = volatile_fid; 5764 req->AdditionalInformation = cpu_to_le32(additional_info); 5765 5766 req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req)); 5767 req->BufferLength = cpu_to_le32(*size); 5768 5769 memcpy(req->Buffer, *data, *size); 5770 total_len += *size; 5771 5772 iov[0].iov_base = (char *)req; 5773 /* 1 for Buffer */ 5774 iov[0].iov_len = total_len - 1; 5775 5776 for (i = 1; i < rqst->rq_nvec; i++) { 5777 le32_add_cpu(&req->BufferLength, size[i]); 5778 iov[i].iov_base = (char *)data[i]; 5779 iov[i].iov_len = size[i]; 5780 } 5781 5782 return 0; 5783 } 5784 5785 void 5786 SMB2_set_info_free(struct smb_rqst *rqst) 5787 { 5788 if (rqst && rqst->rq_iov) 5789 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */ 5790 } 5791 5792 static int 5793 send_set_info(const unsigned int xid, struct cifs_tcon *tcon, 5794 u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class, 5795 u8 info_type, u32 additional_info, unsigned int num, 5796 void **data, unsigned int *size) 5797 { 5798 struct smb_rqst rqst; 5799 struct smb2_set_info_rsp *rsp = NULL; 5800 struct kvec *iov; 5801 struct kvec rsp_iov; 5802 int rc = 0; 5803 int resp_buftype; 5804 struct cifs_ses *ses = tcon->ses; 5805 struct TCP_Server_Info *server; 5806 int flags = 0; 5807 int retries = 0, cur_sleep = 0; 5808 5809 replay_again: 5810 /* reinitialize for possible replay */ 5811 flags = 0; 5812 server = cifs_pick_channel(ses); 5813 5814 if (!ses || !server) 5815 return smb_EIO(smb_eio_trace_null_pointers); 5816 5817 if (!num) 5818 return -EINVAL; 5819 5820 if (smb3_encryption_required(tcon)) 5821 flags |= CIFS_TRANSFORM_REQ; 5822 5823 iov = kmalloc_objs(struct kvec, num); 5824 if (!iov) 5825 return -ENOMEM; 5826 5827 memset(&rqst, 0, sizeof(struct smb_rqst)); 5828 rqst.rq_iov = iov; 5829 rqst.rq_nvec = num; 5830 5831 rc = SMB2_set_info_init(tcon, server, 5832 &rqst, persistent_fid, volatile_fid, pid, 5833 info_class, info_type, additional_info, 5834 data, size); 5835 if (rc) { 5836 kfree(iov); 5837 return rc; 5838 } 5839 5840 if (retries) { 5841 /* Back-off before retry */ 5842 if (cur_sleep) 5843 msleep(cur_sleep); 5844 smb2_set_replay(server, &rqst); 5845 } 5846 5847 rc = cifs_send_recv(xid, ses, server, 5848 &rqst, &resp_buftype, flags, 5849 &rsp_iov); 5850 SMB2_set_info_free(&rqst); 5851 rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base; 5852 5853 if (rc != 0) { 5854 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE); 5855 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid, 5856 ses->Suid, info_class, (__u32)info_type, rc); 5857 } 5858 5859 free_rsp_buf(resp_buftype, rsp); 5860 kfree(iov); 5861 5862 if (is_replayable_error(rc) && 5863 smb2_should_replay(tcon, &retries, &cur_sleep)) 5864 goto replay_again; 5865 5866 return rc; 5867 } 5868 5869 int 5870 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, 5871 u64 volatile_fid, u32 pid, loff_t new_eof) 5872 { 5873 struct smb2_file_eof_info info; 5874 void *data; 5875 unsigned int size; 5876 5877 info.EndOfFile = cpu_to_le64(new_eof); 5878 5879 data = &info; 5880 size = sizeof(struct smb2_file_eof_info); 5881 5882 trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof); 5883 5884 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5885 pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE, 5886 0, 1, &data, &size); 5887 } 5888 5889 int 5890 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon, 5891 u64 persistent_fid, u64 volatile_fid, 5892 struct smb_ntsd *pnntsd, int pacllen, int aclflag) 5893 { 5894 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5895 current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag, 5896 1, (void **)&pnntsd, &pacllen); 5897 } 5898 5899 int 5900 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon, 5901 u64 persistent_fid, u64 volatile_fid, 5902 struct smb2_file_full_ea_info *buf, int len) 5903 { 5904 return send_set_info(xid, tcon, persistent_fid, volatile_fid, 5905 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 5906 0, 1, (void **)&buf, &len); 5907 } 5908 5909 int 5910 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon, 5911 const u64 persistent_fid, const u64 volatile_fid, 5912 __u8 oplock_level) 5913 { 5914 struct smb_rqst rqst; 5915 int rc; 5916 struct smb2_oplock_break *req = NULL; 5917 struct cifs_ses *ses = tcon->ses; 5918 struct TCP_Server_Info *server; 5919 int flags = CIFS_OBREAK_OP; 5920 unsigned int total_len; 5921 struct kvec iov[1]; 5922 struct kvec rsp_iov; 5923 int resp_buf_type; 5924 int retries = 0, cur_sleep = 0; 5925 5926 replay_again: 5927 /* reinitialize for possible replay */ 5928 flags = CIFS_OBREAK_OP; 5929 server = cifs_pick_channel(ses); 5930 5931 cifs_dbg(FYI, "SMB2_oplock_break\n"); 5932 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server, 5933 (void **) &req, &total_len); 5934 if (rc) 5935 return rc; 5936 5937 if (smb3_encryption_required(tcon)) 5938 flags |= CIFS_TRANSFORM_REQ; 5939 5940 req->VolatileFid = volatile_fid; 5941 req->PersistentFid = persistent_fid; 5942 req->OplockLevel = oplock_level; 5943 req->hdr.CreditRequest = cpu_to_le16(1); 5944 5945 flags |= CIFS_NO_RSP_BUF; 5946 5947 iov[0].iov_base = (char *)req; 5948 iov[0].iov_len = total_len; 5949 5950 memset(&rqst, 0, sizeof(struct smb_rqst)); 5951 rqst.rq_iov = iov; 5952 rqst.rq_nvec = 1; 5953 5954 if (retries) { 5955 /* Back-off before retry */ 5956 if (cur_sleep) 5957 msleep(cur_sleep); 5958 smb2_set_replay(server, &rqst); 5959 } 5960 5961 rc = cifs_send_recv(xid, ses, server, 5962 &rqst, &resp_buf_type, flags, &rsp_iov); 5963 cifs_small_buf_release(req); 5964 if (rc) { 5965 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); 5966 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc); 5967 } 5968 5969 if (is_replayable_error(rc) && 5970 smb2_should_replay(tcon, &retries, &cur_sleep)) 5971 goto replay_again; 5972 5973 return rc; 5974 } 5975 5976 void 5977 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf, 5978 struct kstatfs *kst) 5979 { 5980 kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) * 5981 le32_to_cpu(pfs_inf->SectorsPerAllocationUnit); 5982 kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits); 5983 kst->f_bfree = kst->f_bavail = 5984 le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits); 5985 return; 5986 } 5987 5988 static void 5989 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data, 5990 struct kstatfs *kst) 5991 { 5992 kst->f_bsize = le32_to_cpu(response_data->BlockSize); 5993 kst->f_blocks = le64_to_cpu(response_data->TotalBlocks); 5994 kst->f_bfree = le64_to_cpu(response_data->BlocksAvail); 5995 if (response_data->UserBlocksAvail == cpu_to_le64(-1)) 5996 kst->f_bavail = kst->f_bfree; 5997 else 5998 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail); 5999 if (response_data->TotalFileNodes != cpu_to_le64(-1)) 6000 kst->f_files = le64_to_cpu(response_data->TotalFileNodes); 6001 if (response_data->FreeFileNodes != cpu_to_le64(-1)) 6002 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes); 6003 6004 return; 6005 } 6006 6007 static int 6008 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, 6009 struct TCP_Server_Info *server, 6010 int level, int outbuf_len, u64 persistent_fid, 6011 u64 volatile_fid) 6012 { 6013 int rc; 6014 struct smb2_query_info_req *req; 6015 unsigned int total_len; 6016 6017 cifs_dbg(FYI, "Query FSInfo level %d\n", level); 6018 6019 if ((tcon->ses == NULL) || server == NULL) 6020 return smb_EIO(smb_eio_trace_null_pointers); 6021 6022 rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server, 6023 (void **) &req, &total_len); 6024 if (rc) 6025 return rc; 6026 6027 req->InfoType = SMB2_O_INFO_FILESYSTEM; 6028 req->FileInfoClass = level; 6029 req->PersistentFileId = persistent_fid; 6030 req->VolatileFileId = volatile_fid; 6031 /* 1 for pad */ 6032 req->InputBufferOffset = 6033 cpu_to_le16(sizeof(struct smb2_query_info_req)); 6034 req->OutputBufferLength = cpu_to_le32( 6035 outbuf_len + sizeof(struct smb2_query_info_rsp)); 6036 6037 iov->iov_base = (char *)req; 6038 iov->iov_len = total_len; 6039 return 0; 6040 } 6041 6042 static inline void free_qfs_info_req(struct kvec *iov) 6043 { 6044 cifs_buf_release(iov->iov_base); 6045 } 6046 6047 int 6048 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon, 6049 u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) 6050 { 6051 struct smb_rqst rqst; 6052 struct smb2_query_info_rsp *rsp = NULL; 6053 struct kvec iov; 6054 struct kvec rsp_iov; 6055 int rc = 0; 6056 int resp_buftype; 6057 struct cifs_ses *ses = tcon->ses; 6058 struct TCP_Server_Info *server; 6059 FILE_SYSTEM_POSIX_INFO *info = NULL; 6060 int flags = 0; 6061 int retries = 0, cur_sleep = 0; 6062 6063 replay_again: 6064 /* reinitialize for possible replay */ 6065 flags = 0; 6066 server = cifs_pick_channel(ses); 6067 6068 rc = build_qfs_info_req(&iov, tcon, server, 6069 FS_POSIX_INFORMATION, 6070 sizeof(FILE_SYSTEM_POSIX_INFO), 6071 persistent_fid, volatile_fid); 6072 if (rc) 6073 return rc; 6074 6075 if (smb3_encryption_required(tcon)) 6076 flags |= CIFS_TRANSFORM_REQ; 6077 6078 memset(&rqst, 0, sizeof(struct smb_rqst)); 6079 rqst.rq_iov = &iov; 6080 rqst.rq_nvec = 1; 6081 6082 if (retries) { 6083 /* Back-off before retry */ 6084 if (cur_sleep) 6085 msleep(cur_sleep); 6086 smb2_set_replay(server, &rqst); 6087 } 6088 6089 rc = cifs_send_recv(xid, ses, server, 6090 &rqst, &resp_buftype, flags, &rsp_iov); 6091 free_qfs_info_req(&iov); 6092 if (rc) { 6093 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 6094 goto posix_qfsinf_exit; 6095 } 6096 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 6097 6098 info = (FILE_SYSTEM_POSIX_INFO *)( 6099 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp); 6100 rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset), 6101 le32_to_cpu(rsp->OutputBufferLength), &rsp_iov, 6102 sizeof(FILE_SYSTEM_POSIX_INFO)); 6103 if (!rc) 6104 copy_posix_fs_info_to_kstatfs(info, fsdata); 6105 6106 posix_qfsinf_exit: 6107 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 6108 6109 if (is_replayable_error(rc) && 6110 smb2_should_replay(tcon, &retries, &cur_sleep)) 6111 goto replay_again; 6112 6113 return rc; 6114 } 6115 6116 int 6117 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon, 6118 u64 persistent_fid, u64 volatile_fid, int level) 6119 { 6120 struct smb_rqst rqst; 6121 struct smb2_query_info_rsp *rsp = NULL; 6122 struct kvec iov; 6123 struct kvec rsp_iov; 6124 int rc = 0; 6125 int resp_buftype, max_len, min_len; 6126 struct cifs_ses *ses = tcon->ses; 6127 struct TCP_Server_Info *server; 6128 unsigned int rsp_len, offset; 6129 int flags = 0; 6130 int retries = 0, cur_sleep = 0; 6131 6132 replay_again: 6133 /* reinitialize for possible replay */ 6134 flags = 0; 6135 server = cifs_pick_channel(ses); 6136 6137 if (level == FS_DEVICE_INFORMATION) { 6138 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO); 6139 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO); 6140 } else if (level == FS_ATTRIBUTE_INFORMATION) { 6141 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO) + MAX_FS_NAME_LEN; 6142 min_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO); 6143 } else if (level == FS_SECTOR_SIZE_INFORMATION) { 6144 max_len = sizeof(struct smb3_fs_ss_info); 6145 min_len = sizeof(struct smb3_fs_ss_info); 6146 } else if (level == FS_VOLUME_INFORMATION) { 6147 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN; 6148 min_len = sizeof(struct smb3_fs_vol_info); 6149 } else { 6150 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level); 6151 return -EINVAL; 6152 } 6153 6154 rc = build_qfs_info_req(&iov, tcon, server, 6155 level, max_len, 6156 persistent_fid, volatile_fid); 6157 if (rc) 6158 return rc; 6159 6160 if (smb3_encryption_required(tcon)) 6161 flags |= CIFS_TRANSFORM_REQ; 6162 6163 memset(&rqst, 0, sizeof(struct smb_rqst)); 6164 rqst.rq_iov = &iov; 6165 rqst.rq_nvec = 1; 6166 6167 if (retries) { 6168 /* Back-off before retry */ 6169 if (cur_sleep) 6170 msleep(cur_sleep); 6171 smb2_set_replay(server, &rqst); 6172 } 6173 6174 rc = cifs_send_recv(xid, ses, server, 6175 &rqst, &resp_buftype, flags, &rsp_iov); 6176 free_qfs_info_req(&iov); 6177 if (rc) { 6178 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); 6179 goto qfsattr_exit; 6180 } 6181 rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; 6182 6183 rsp_len = le32_to_cpu(rsp->OutputBufferLength); 6184 offset = le16_to_cpu(rsp->OutputBufferOffset); 6185 rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len); 6186 if (rc) 6187 goto qfsattr_exit; 6188 6189 if (level == FS_ATTRIBUTE_INFORMATION) 6190 memcpy(&tcon->fsAttrInfo, offset 6191 + (char *)rsp, min_t(unsigned int, 6192 rsp_len, min_len)); 6193 else if (level == FS_DEVICE_INFORMATION) 6194 memcpy(&tcon->fsDevInfo, offset 6195 + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO)); 6196 else if (level == FS_SECTOR_SIZE_INFORMATION) { 6197 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *) 6198 (offset + (char *)rsp); 6199 tcon->ss_flags = le32_to_cpu(ss_info->Flags); 6200 tcon->perf_sector_size = 6201 le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf); 6202 } else if (level == FS_VOLUME_INFORMATION) { 6203 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *) 6204 (offset + (char *)rsp); 6205 tcon->vol_serial_number = vol_info->VolumeSerialNumber; 6206 tcon->vol_create_time = vol_info->VolumeCreationTime; 6207 } 6208 6209 qfsattr_exit: 6210 free_rsp_buf(resp_buftype, rsp_iov.iov_base); 6211 6212 if (is_replayable_error(rc) && 6213 smb2_should_replay(tcon, &retries, &cur_sleep)) 6214 goto replay_again; 6215 6216 return rc; 6217 } 6218 6219 int 6220 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon, 6221 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, 6222 const __u32 num_lock, struct smb2_lock_element *buf) 6223 { 6224 struct smb_rqst rqst; 6225 int rc = 0; 6226 struct smb2_lock_req *req = NULL; 6227 struct kvec iov[2]; 6228 struct kvec rsp_iov; 6229 int resp_buf_type; 6230 unsigned int count; 6231 int flags = CIFS_NO_RSP_BUF; 6232 unsigned int total_len; 6233 struct TCP_Server_Info *server; 6234 int retries = 0, cur_sleep = 0; 6235 6236 replay_again: 6237 /* reinitialize for possible replay */ 6238 flags = CIFS_NO_RSP_BUF; 6239 server = cifs_pick_channel(tcon->ses); 6240 6241 cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock); 6242 6243 rc = smb2_plain_req_init(SMB2_LOCK, tcon, server, 6244 (void **) &req, &total_len); 6245 if (rc) 6246 return rc; 6247 6248 if (smb3_encryption_required(tcon)) 6249 flags |= CIFS_TRANSFORM_REQ; 6250 6251 req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid); 6252 req->LockCount = cpu_to_le16(num_lock); 6253 6254 req->PersistentFileId = persist_fid; 6255 req->VolatileFileId = volatile_fid; 6256 6257 count = num_lock * sizeof(struct smb2_lock_element); 6258 6259 iov[0].iov_base = (char *)req; 6260 iov[0].iov_len = total_len - sizeof(struct smb2_lock_element); 6261 iov[1].iov_base = (char *)buf; 6262 iov[1].iov_len = count; 6263 6264 cifs_stats_inc(&tcon->stats.cifs_stats.num_locks); 6265 6266 memset(&rqst, 0, sizeof(struct smb_rqst)); 6267 rqst.rq_iov = iov; 6268 rqst.rq_nvec = 2; 6269 6270 if (retries) { 6271 /* Back-off before retry */ 6272 if (cur_sleep) 6273 msleep(cur_sleep); 6274 smb2_set_replay(server, &rqst); 6275 } 6276 6277 rc = cifs_send_recv(xid, tcon->ses, server, 6278 &rqst, &resp_buf_type, flags, 6279 &rsp_iov); 6280 cifs_small_buf_release(req); 6281 if (rc) { 6282 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc); 6283 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE); 6284 trace_smb3_lock_err(xid, persist_fid, tcon->tid, 6285 tcon->ses->Suid, rc); 6286 } 6287 6288 if (is_replayable_error(rc) && 6289 smb2_should_replay(tcon, &retries, &cur_sleep)) 6290 goto replay_again; 6291 6292 return rc; 6293 } 6294 6295 int 6296 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon, 6297 const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, 6298 const __u64 length, const __u64 offset, const __u32 lock_flags, 6299 const bool wait) 6300 { 6301 struct smb2_lock_element lock; 6302 6303 lock.Offset = cpu_to_le64(offset); 6304 lock.Length = cpu_to_le64(length); 6305 lock.Flags = cpu_to_le32(lock_flags); 6306 if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK) 6307 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY); 6308 6309 return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock); 6310 } 6311 6312 int 6313 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon, 6314 __u8 *lease_key, const __le32 lease_state) 6315 { 6316 struct smb_rqst rqst; 6317 int rc; 6318 struct smb2_lease_ack *req = NULL; 6319 struct cifs_ses *ses = tcon->ses; 6320 int flags = CIFS_OBREAK_OP; 6321 unsigned int total_len; 6322 struct kvec iov[1]; 6323 struct kvec rsp_iov; 6324 int resp_buf_type; 6325 __u64 *please_key_high; 6326 __u64 *please_key_low; 6327 struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses); 6328 6329 cifs_dbg(FYI, "SMB2_lease_break\n"); 6330 rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server, 6331 (void **) &req, &total_len); 6332 if (rc) 6333 return rc; 6334 6335 if (smb3_encryption_required(tcon)) 6336 flags |= CIFS_TRANSFORM_REQ; 6337 6338 req->hdr.CreditRequest = cpu_to_le16(1); 6339 req->StructureSize = cpu_to_le16(36); 6340 total_len += 12; 6341 6342 memcpy(req->LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE); 6343 req->LeaseState = lease_state; 6344 6345 flags |= CIFS_NO_RSP_BUF; 6346 6347 iov[0].iov_base = (char *)req; 6348 iov[0].iov_len = total_len; 6349 6350 memset(&rqst, 0, sizeof(struct smb_rqst)); 6351 rqst.rq_iov = iov; 6352 rqst.rq_nvec = 1; 6353 6354 rc = cifs_send_recv(xid, ses, server, 6355 &rqst, &resp_buf_type, flags, &rsp_iov); 6356 cifs_small_buf_release(req); 6357 6358 please_key_low = (__u64 *)lease_key; 6359 please_key_high = (__u64 *)(lease_key+8); 6360 if (rc) { 6361 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); 6362 trace_smb3_lease_ack_err(le32_to_cpu(lease_state), tcon->tid, 6363 ses->Suid, *please_key_low, *please_key_high, rc); 6364 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc); 6365 } else 6366 trace_smb3_lease_ack_done(le32_to_cpu(lease_state), tcon->tid, 6367 ses->Suid, *please_key_low, *please_key_high); 6368 6369 return rc; 6370 } 6371