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