1 // SPDX-License-Identifier: LGPL-2.1 2 /* 3 * 4 * Copyright (C) International Business Machines Corp., 2002,2011 5 * Author(s): Steve French (sfrench@us.ibm.com) 6 * 7 */ 8 #include <linux/fs.h> 9 #include <linux/net.h> 10 #include <linux/string.h> 11 #include <linux/sched/mm.h> 12 #include <linux/sched/signal.h> 13 #include <linux/list.h> 14 #include <linux/wait.h> 15 #include <linux/slab.h> 16 #include <linux/pagemap.h> 17 #include <linux/ctype.h> 18 #include <linux/utsname.h> 19 #include <linux/mempool.h> 20 #include <linux/delay.h> 21 #include <linux/completion.h> 22 #include <linux/kthread.h> 23 #include <linux/pagevec.h> 24 #include <linux/freezer.h> 25 #include <linux/namei.h> 26 #include <linux/uuid.h> 27 #include <linux/uaccess.h> 28 #include <asm/processor.h> 29 #include <linux/inet.h> 30 #include <linux/module.h> 31 #include <keys/user-type.h> 32 #include <net/ipv6.h> 33 #include <linux/parser.h> 34 #include <linux/bvec.h> 35 #include "cifspdu.h" 36 #include "cifsglob.h" 37 #include "cifsproto.h" 38 #include "cifs_unicode.h" 39 #include "cifs_debug.h" 40 #include "cifs_fs_sb.h" 41 #include "ntlmssp.h" 42 #include "nterr.h" 43 #include "rfc1002pdu.h" 44 #include "fscache.h" 45 #include "smb2proto.h" 46 #include "smbdirect.h" 47 #include "dns_resolve.h" 48 #ifdef CONFIG_CIFS_DFS_UPCALL 49 #include "dfs.h" 50 #include "dfs_cache.h" 51 #endif 52 #include "fs_context.h" 53 #include "cifs_swn.h" 54 55 extern mempool_t *cifs_req_poolp; 56 extern bool disable_legacy_dialects; 57 58 /* FIXME: should these be tunable? */ 59 #define TLINK_ERROR_EXPIRE (1 * HZ) 60 #define TLINK_IDLE_EXPIRE (600 * HZ) 61 62 /* Drop the connection to not overload the server */ 63 #define MAX_STATUS_IO_TIMEOUT 5 64 65 static int ip_connect(struct TCP_Server_Info *server); 66 static int generic_ip_connect(struct TCP_Server_Info *server); 67 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink); 68 static void cifs_prune_tlinks(struct work_struct *work); 69 70 /* 71 * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may 72 * get their ip addresses changed at some point. 73 * 74 * This should be called with server->srv_mutex held. 75 */ 76 static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server) 77 { 78 int rc; 79 int len; 80 char *unc; 81 struct sockaddr_storage ss; 82 83 if (!server->hostname) 84 return -EINVAL; 85 86 /* if server hostname isn't populated, there's nothing to do here */ 87 if (server->hostname[0] == '\0') 88 return 0; 89 90 len = strlen(server->hostname) + 3; 91 92 unc = kmalloc(len, GFP_KERNEL); 93 if (!unc) { 94 cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__); 95 return -ENOMEM; 96 } 97 scnprintf(unc, len, "\\\\%s", server->hostname); 98 99 spin_lock(&server->srv_lock); 100 ss = server->dstaddr; 101 spin_unlock(&server->srv_lock); 102 103 rc = dns_resolve_server_name_to_ip(unc, (struct sockaddr *)&ss, NULL); 104 kfree(unc); 105 106 if (rc < 0) { 107 cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n", 108 __func__, server->hostname, rc); 109 } else { 110 spin_lock(&server->srv_lock); 111 memcpy(&server->dstaddr, &ss, sizeof(server->dstaddr)); 112 spin_unlock(&server->srv_lock); 113 rc = 0; 114 } 115 116 return rc; 117 } 118 119 static void smb2_query_server_interfaces(struct work_struct *work) 120 { 121 int rc; 122 struct cifs_tcon *tcon = container_of(work, 123 struct cifs_tcon, 124 query_interfaces.work); 125 126 /* 127 * query server network interfaces, in case they change 128 */ 129 rc = SMB3_request_interfaces(0, tcon, false); 130 if (rc) { 131 if (rc == -EOPNOTSUPP) 132 return; 133 134 cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n", 135 __func__, rc); 136 } 137 138 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces, 139 (SMB_INTERFACE_POLL_INTERVAL * HZ)); 140 } 141 142 /* 143 * Update the tcpStatus for the server. 144 * This is used to signal the cifsd thread to call cifs_reconnect 145 * ONLY cifsd thread should call cifs_reconnect. For any other 146 * thread, use this function 147 * 148 * @server: the tcp ses for which reconnect is needed 149 * @all_channels: if this needs to be done for all channels 150 */ 151 void 152 cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server, 153 bool all_channels) 154 { 155 struct TCP_Server_Info *pserver; 156 struct cifs_ses *ses; 157 int i; 158 159 /* If server is a channel, select the primary channel */ 160 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 161 162 /* if we need to signal just this channel */ 163 if (!all_channels) { 164 spin_lock(&server->srv_lock); 165 if (server->tcpStatus != CifsExiting) 166 server->tcpStatus = CifsNeedReconnect; 167 spin_unlock(&server->srv_lock); 168 return; 169 } 170 171 spin_lock(&cifs_tcp_ses_lock); 172 list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { 173 spin_lock(&ses->chan_lock); 174 for (i = 0; i < ses->chan_count; i++) { 175 if (!ses->chans[i].server) 176 continue; 177 178 spin_lock(&ses->chans[i].server->srv_lock); 179 if (ses->chans[i].server->tcpStatus != CifsExiting) 180 ses->chans[i].server->tcpStatus = CifsNeedReconnect; 181 spin_unlock(&ses->chans[i].server->srv_lock); 182 } 183 spin_unlock(&ses->chan_lock); 184 } 185 spin_unlock(&cifs_tcp_ses_lock); 186 } 187 188 /* 189 * Mark all sessions and tcons for reconnect. 190 * IMPORTANT: make sure that this gets called only from 191 * cifsd thread. For any other thread, use 192 * cifs_signal_cifsd_for_reconnect 193 * 194 * @server: the tcp ses for which reconnect is needed 195 * @server needs to be previously set to CifsNeedReconnect. 196 * @mark_smb_session: whether even sessions need to be marked 197 */ 198 void 199 cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server, 200 bool mark_smb_session) 201 { 202 struct TCP_Server_Info *pserver; 203 struct cifs_ses *ses, *nses; 204 struct cifs_tcon *tcon; 205 206 /* 207 * before reconnecting the tcp session, mark the smb session (uid) and the tid bad so they 208 * are not used until reconnected. 209 */ 210 cifs_dbg(FYI, "%s: marking necessary sessions and tcons for reconnect\n", __func__); 211 212 /* If server is a channel, select the primary channel */ 213 pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 214 215 /* 216 * if the server has been marked for termination, there is a 217 * chance that the remaining channels all need reconnect. To be 218 * on the safer side, mark the session and trees for reconnect 219 * for this scenario. This might cause a few redundant session 220 * setup and tree connect requests, but it is better than not doing 221 * a tree connect when needed, and all following requests failing 222 */ 223 if (server->terminate) { 224 mark_smb_session = true; 225 server = pserver; 226 } 227 228 spin_lock(&cifs_tcp_ses_lock); 229 list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) { 230 /* check if iface is still active */ 231 spin_lock(&ses->chan_lock); 232 if (cifs_ses_get_chan_index(ses, server) == 233 CIFS_INVAL_CHAN_INDEX) { 234 spin_unlock(&ses->chan_lock); 235 continue; 236 } 237 238 if (!cifs_chan_is_iface_active(ses, server)) { 239 spin_unlock(&ses->chan_lock); 240 cifs_chan_update_iface(ses, server); 241 spin_lock(&ses->chan_lock); 242 } 243 244 if (!mark_smb_session && cifs_chan_needs_reconnect(ses, server)) { 245 spin_unlock(&ses->chan_lock); 246 continue; 247 } 248 249 if (mark_smb_session) 250 CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses); 251 else 252 cifs_chan_set_need_reconnect(ses, server); 253 254 cifs_dbg(FYI, "%s: channel connect bitmap: 0x%lx\n", 255 __func__, ses->chans_need_reconnect); 256 257 /* If all channels need reconnect, then tcon needs reconnect */ 258 if (!mark_smb_session && !CIFS_ALL_CHANS_NEED_RECONNECT(ses)) { 259 spin_unlock(&ses->chan_lock); 260 continue; 261 } 262 spin_unlock(&ses->chan_lock); 263 264 spin_lock(&ses->ses_lock); 265 ses->ses_status = SES_NEED_RECON; 266 spin_unlock(&ses->ses_lock); 267 268 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { 269 tcon->need_reconnect = true; 270 spin_lock(&tcon->tc_lock); 271 tcon->status = TID_NEED_RECON; 272 spin_unlock(&tcon->tc_lock); 273 274 cancel_delayed_work(&tcon->query_interfaces); 275 } 276 if (ses->tcon_ipc) { 277 ses->tcon_ipc->need_reconnect = true; 278 spin_lock(&ses->tcon_ipc->tc_lock); 279 ses->tcon_ipc->status = TID_NEED_RECON; 280 spin_unlock(&ses->tcon_ipc->tc_lock); 281 } 282 } 283 spin_unlock(&cifs_tcp_ses_lock); 284 } 285 286 static void 287 cifs_abort_connection(struct TCP_Server_Info *server) 288 { 289 struct mid_q_entry *mid, *nmid; 290 struct list_head retry_list; 291 292 server->maxBuf = 0; 293 server->max_read = 0; 294 295 /* do not want to be sending data on a socket we are freeing */ 296 cifs_dbg(FYI, "%s: tearing down socket\n", __func__); 297 cifs_server_lock(server); 298 if (server->ssocket) { 299 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", server->ssocket->state, 300 server->ssocket->flags); 301 kernel_sock_shutdown(server->ssocket, SHUT_WR); 302 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", server->ssocket->state, 303 server->ssocket->flags); 304 sock_release(server->ssocket); 305 server->ssocket = NULL; 306 } 307 server->sequence_number = 0; 308 server->session_estab = false; 309 kfree_sensitive(server->session_key.response); 310 server->session_key.response = NULL; 311 server->session_key.len = 0; 312 server->lstrp = jiffies; 313 314 /* mark submitted MIDs for retry and issue callback */ 315 INIT_LIST_HEAD(&retry_list); 316 cifs_dbg(FYI, "%s: moving mids to private list\n", __func__); 317 spin_lock(&server->mid_lock); 318 list_for_each_entry_safe(mid, nmid, &server->pending_mid_q, qhead) { 319 kref_get(&mid->refcount); 320 if (mid->mid_state == MID_REQUEST_SUBMITTED) 321 mid->mid_state = MID_RETRY_NEEDED; 322 list_move(&mid->qhead, &retry_list); 323 mid->mid_flags |= MID_DELETED; 324 } 325 spin_unlock(&server->mid_lock); 326 cifs_server_unlock(server); 327 328 cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__); 329 list_for_each_entry_safe(mid, nmid, &retry_list, qhead) { 330 list_del_init(&mid->qhead); 331 mid->callback(mid); 332 release_mid(mid); 333 } 334 335 if (cifs_rdma_enabled(server)) { 336 cifs_server_lock(server); 337 smbd_destroy(server); 338 cifs_server_unlock(server); 339 } 340 } 341 342 static bool cifs_tcp_ses_needs_reconnect(struct TCP_Server_Info *server, int num_targets) 343 { 344 spin_lock(&server->srv_lock); 345 server->nr_targets = num_targets; 346 if (server->tcpStatus == CifsExiting) { 347 /* the demux thread will exit normally next time through the loop */ 348 spin_unlock(&server->srv_lock); 349 wake_up(&server->response_q); 350 return false; 351 } 352 353 cifs_dbg(FYI, "Mark tcp session as need reconnect\n"); 354 trace_smb3_reconnect(server->CurrentMid, server->conn_id, 355 server->hostname); 356 server->tcpStatus = CifsNeedReconnect; 357 358 spin_unlock(&server->srv_lock); 359 return true; 360 } 361 362 /* 363 * cifs tcp session reconnection 364 * 365 * mark tcp session as reconnecting so temporarily locked 366 * mark all smb sessions as reconnecting for tcp session 367 * reconnect tcp session 368 * wake up waiters on reconnection? - (not needed currently) 369 * 370 * if mark_smb_session is passed as true, unconditionally mark 371 * the smb session (and tcon) for reconnect as well. This value 372 * doesn't really matter for non-multichannel scenario. 373 * 374 */ 375 static int __cifs_reconnect(struct TCP_Server_Info *server, 376 bool mark_smb_session) 377 { 378 int rc = 0; 379 380 if (!cifs_tcp_ses_needs_reconnect(server, 1)) 381 return 0; 382 383 cifs_mark_tcp_ses_conns_for_reconnect(server, mark_smb_session); 384 385 cifs_abort_connection(server); 386 387 do { 388 try_to_freeze(); 389 cifs_server_lock(server); 390 391 if (!cifs_swn_set_server_dstaddr(server)) { 392 /* resolve the hostname again to make sure that IP address is up-to-date */ 393 rc = reconn_set_ipaddr_from_hostname(server); 394 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc); 395 } 396 397 if (cifs_rdma_enabled(server)) 398 rc = smbd_reconnect(server); 399 else 400 rc = generic_ip_connect(server); 401 if (rc) { 402 cifs_server_unlock(server); 403 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc); 404 msleep(3000); 405 } else { 406 atomic_inc(&tcpSesReconnectCount); 407 set_credits(server, 1); 408 spin_lock(&server->srv_lock); 409 if (server->tcpStatus != CifsExiting) 410 server->tcpStatus = CifsNeedNegotiate; 411 spin_unlock(&server->srv_lock); 412 cifs_swn_reset_server_dstaddr(server); 413 cifs_server_unlock(server); 414 mod_delayed_work(cifsiod_wq, &server->reconnect, 0); 415 } 416 } while (server->tcpStatus == CifsNeedReconnect); 417 418 spin_lock(&server->srv_lock); 419 if (server->tcpStatus == CifsNeedNegotiate) 420 mod_delayed_work(cifsiod_wq, &server->echo, 0); 421 spin_unlock(&server->srv_lock); 422 423 wake_up(&server->response_q); 424 return rc; 425 } 426 427 #ifdef CONFIG_CIFS_DFS_UPCALL 428 static int __reconnect_target_unlocked(struct TCP_Server_Info *server, const char *target) 429 { 430 int rc; 431 char *hostname; 432 433 if (!cifs_swn_set_server_dstaddr(server)) { 434 if (server->hostname != target) { 435 hostname = extract_hostname(target); 436 if (!IS_ERR(hostname)) { 437 spin_lock(&server->srv_lock); 438 kfree(server->hostname); 439 server->hostname = hostname; 440 spin_unlock(&server->srv_lock); 441 } else { 442 cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n", 443 __func__, PTR_ERR(hostname)); 444 cifs_dbg(FYI, "%s: default to last target server: %s\n", __func__, 445 server->hostname); 446 } 447 } 448 /* resolve the hostname again to make sure that IP address is up-to-date. */ 449 rc = reconn_set_ipaddr_from_hostname(server); 450 cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc); 451 } 452 /* Reconnect the socket */ 453 if (cifs_rdma_enabled(server)) 454 rc = smbd_reconnect(server); 455 else 456 rc = generic_ip_connect(server); 457 458 return rc; 459 } 460 461 static int reconnect_target_unlocked(struct TCP_Server_Info *server, struct dfs_cache_tgt_list *tl, 462 struct dfs_cache_tgt_iterator **target_hint) 463 { 464 int rc; 465 struct dfs_cache_tgt_iterator *tit; 466 467 *target_hint = NULL; 468 469 /* If dfs target list is empty, then reconnect to last server */ 470 tit = dfs_cache_get_tgt_iterator(tl); 471 if (!tit) 472 return __reconnect_target_unlocked(server, server->hostname); 473 474 /* Otherwise, try every dfs target in @tl */ 475 for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) { 476 rc = __reconnect_target_unlocked(server, dfs_cache_get_tgt_name(tit)); 477 if (!rc) { 478 *target_hint = tit; 479 break; 480 } 481 } 482 return rc; 483 } 484 485 static int reconnect_dfs_server(struct TCP_Server_Info *server) 486 { 487 struct dfs_cache_tgt_iterator *target_hint = NULL; 488 DFS_CACHE_TGT_LIST(tl); 489 int num_targets = 0; 490 int rc = 0; 491 492 /* 493 * Determine the number of dfs targets the referral path in @cifs_sb resolves to. 494 * 495 * smb2_reconnect() needs to know how long it should wait based upon the number of dfs 496 * targets (server->nr_targets). It's also possible that the cached referral was cleared 497 * through /proc/fs/cifs/dfscache or the target list is empty due to server settings after 498 * refreshing the referral, so, in this case, default it to 1. 499 */ 500 mutex_lock(&server->refpath_lock); 501 if (!dfs_cache_noreq_find(server->leaf_fullpath + 1, NULL, &tl)) 502 num_targets = dfs_cache_get_nr_tgts(&tl); 503 mutex_unlock(&server->refpath_lock); 504 if (!num_targets) 505 num_targets = 1; 506 507 if (!cifs_tcp_ses_needs_reconnect(server, num_targets)) 508 return 0; 509 510 /* 511 * Unconditionally mark all sessions & tcons for reconnect as we might be connecting to a 512 * different server or share during failover. It could be improved by adding some logic to 513 * only do that in case it connects to a different server or share, though. 514 */ 515 cifs_mark_tcp_ses_conns_for_reconnect(server, true); 516 517 cifs_abort_connection(server); 518 519 do { 520 try_to_freeze(); 521 cifs_server_lock(server); 522 523 rc = reconnect_target_unlocked(server, &tl, &target_hint); 524 if (rc) { 525 /* Failed to reconnect socket */ 526 cifs_server_unlock(server); 527 cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc); 528 msleep(3000); 529 continue; 530 } 531 /* 532 * Socket was created. Update tcp session status to CifsNeedNegotiate so that a 533 * process waiting for reconnect will know it needs to re-establish session and tcon 534 * through the reconnected target server. 535 */ 536 atomic_inc(&tcpSesReconnectCount); 537 set_credits(server, 1); 538 spin_lock(&server->srv_lock); 539 if (server->tcpStatus != CifsExiting) 540 server->tcpStatus = CifsNeedNegotiate; 541 spin_unlock(&server->srv_lock); 542 cifs_swn_reset_server_dstaddr(server); 543 cifs_server_unlock(server); 544 mod_delayed_work(cifsiod_wq, &server->reconnect, 0); 545 } while (server->tcpStatus == CifsNeedReconnect); 546 547 mutex_lock(&server->refpath_lock); 548 dfs_cache_noreq_update_tgthint(server->leaf_fullpath + 1, target_hint); 549 mutex_unlock(&server->refpath_lock); 550 dfs_cache_free_tgts(&tl); 551 552 /* Need to set up echo worker again once connection has been established */ 553 spin_lock(&server->srv_lock); 554 if (server->tcpStatus == CifsNeedNegotiate) 555 mod_delayed_work(cifsiod_wq, &server->echo, 0); 556 spin_unlock(&server->srv_lock); 557 558 wake_up(&server->response_q); 559 return rc; 560 } 561 562 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session) 563 { 564 mutex_lock(&server->refpath_lock); 565 if (!server->leaf_fullpath) { 566 mutex_unlock(&server->refpath_lock); 567 return __cifs_reconnect(server, mark_smb_session); 568 } 569 mutex_unlock(&server->refpath_lock); 570 571 return reconnect_dfs_server(server); 572 } 573 #else 574 int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session) 575 { 576 return __cifs_reconnect(server, mark_smb_session); 577 } 578 #endif 579 580 static void 581 cifs_echo_request(struct work_struct *work) 582 { 583 int rc; 584 struct TCP_Server_Info *server = container_of(work, 585 struct TCP_Server_Info, echo.work); 586 587 /* 588 * We cannot send an echo if it is disabled. 589 * Also, no need to ping if we got a response recently. 590 */ 591 592 if (server->tcpStatus == CifsNeedReconnect || 593 server->tcpStatus == CifsExiting || 594 server->tcpStatus == CifsNew || 595 (server->ops->can_echo && !server->ops->can_echo(server)) || 596 time_before(jiffies, server->lstrp + server->echo_interval - HZ)) 597 goto requeue_echo; 598 599 rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS; 600 cifs_server_dbg(FYI, "send echo request: rc = %d\n", rc); 601 602 /* Check witness registrations */ 603 cifs_swn_check(); 604 605 requeue_echo: 606 queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval); 607 } 608 609 static bool 610 allocate_buffers(struct TCP_Server_Info *server) 611 { 612 if (!server->bigbuf) { 613 server->bigbuf = (char *)cifs_buf_get(); 614 if (!server->bigbuf) { 615 cifs_server_dbg(VFS, "No memory for large SMB response\n"); 616 msleep(3000); 617 /* retry will check if exiting */ 618 return false; 619 } 620 } else if (server->large_buf) { 621 /* we are reusing a dirty large buf, clear its start */ 622 memset(server->bigbuf, 0, HEADER_SIZE(server)); 623 } 624 625 if (!server->smallbuf) { 626 server->smallbuf = (char *)cifs_small_buf_get(); 627 if (!server->smallbuf) { 628 cifs_server_dbg(VFS, "No memory for SMB response\n"); 629 msleep(1000); 630 /* retry will check if exiting */ 631 return false; 632 } 633 /* beginning of smb buffer is cleared in our buf_get */ 634 } else { 635 /* if existing small buf clear beginning */ 636 memset(server->smallbuf, 0, HEADER_SIZE(server)); 637 } 638 639 return true; 640 } 641 642 static bool 643 server_unresponsive(struct TCP_Server_Info *server) 644 { 645 /* 646 * We need to wait 3 echo intervals to make sure we handle such 647 * situations right: 648 * 1s client sends a normal SMB request 649 * 2s client gets a response 650 * 30s echo workqueue job pops, and decides we got a response recently 651 * and don't need to send another 652 * ... 653 * 65s kernel_recvmsg times out, and we see that we haven't gotten 654 * a response in >60s. 655 */ 656 spin_lock(&server->srv_lock); 657 if ((server->tcpStatus == CifsGood || 658 server->tcpStatus == CifsNeedNegotiate) && 659 (!server->ops->can_echo || server->ops->can_echo(server)) && 660 time_after(jiffies, server->lstrp + 3 * server->echo_interval)) { 661 spin_unlock(&server->srv_lock); 662 cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n", 663 (3 * server->echo_interval) / HZ); 664 cifs_reconnect(server, false); 665 return true; 666 } 667 spin_unlock(&server->srv_lock); 668 669 return false; 670 } 671 672 static inline bool 673 zero_credits(struct TCP_Server_Info *server) 674 { 675 int val; 676 677 spin_lock(&server->req_lock); 678 val = server->credits + server->echo_credits + server->oplock_credits; 679 if (server->in_flight == 0 && val == 0) { 680 spin_unlock(&server->req_lock); 681 return true; 682 } 683 spin_unlock(&server->req_lock); 684 return false; 685 } 686 687 static int 688 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg) 689 { 690 int length = 0; 691 int total_read; 692 693 for (total_read = 0; msg_data_left(smb_msg); total_read += length) { 694 try_to_freeze(); 695 696 /* reconnect if no credits and no requests in flight */ 697 if (zero_credits(server)) { 698 cifs_reconnect(server, false); 699 return -ECONNABORTED; 700 } 701 702 if (server_unresponsive(server)) 703 return -ECONNABORTED; 704 if (cifs_rdma_enabled(server) && server->smbd_conn) 705 length = smbd_recv(server->smbd_conn, smb_msg); 706 else 707 length = sock_recvmsg(server->ssocket, smb_msg, 0); 708 709 spin_lock(&server->srv_lock); 710 if (server->tcpStatus == CifsExiting) { 711 spin_unlock(&server->srv_lock); 712 return -ESHUTDOWN; 713 } 714 715 if (server->tcpStatus == CifsNeedReconnect) { 716 spin_unlock(&server->srv_lock); 717 cifs_reconnect(server, false); 718 return -ECONNABORTED; 719 } 720 spin_unlock(&server->srv_lock); 721 722 if (length == -ERESTARTSYS || 723 length == -EAGAIN || 724 length == -EINTR) { 725 /* 726 * Minimum sleep to prevent looping, allowing socket 727 * to clear and app threads to set tcpStatus 728 * CifsNeedReconnect if server hung. 729 */ 730 usleep_range(1000, 2000); 731 length = 0; 732 continue; 733 } 734 735 if (length <= 0) { 736 cifs_dbg(FYI, "Received no data or error: %d\n", length); 737 cifs_reconnect(server, false); 738 return -ECONNABORTED; 739 } 740 } 741 return total_read; 742 } 743 744 int 745 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf, 746 unsigned int to_read) 747 { 748 struct msghdr smb_msg = {}; 749 struct kvec iov = {.iov_base = buf, .iov_len = to_read}; 750 iov_iter_kvec(&smb_msg.msg_iter, ITER_DEST, &iov, 1, to_read); 751 752 return cifs_readv_from_socket(server, &smb_msg); 753 } 754 755 ssize_t 756 cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read) 757 { 758 struct msghdr smb_msg = {}; 759 760 /* 761 * iov_iter_discard already sets smb_msg.type and count and iov_offset 762 * and cifs_readv_from_socket sets msg_control and msg_controllen 763 * so little to initialize in struct msghdr 764 */ 765 iov_iter_discard(&smb_msg.msg_iter, ITER_DEST, to_read); 766 767 return cifs_readv_from_socket(server, &smb_msg); 768 } 769 770 int 771 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page, 772 unsigned int page_offset, unsigned int to_read) 773 { 774 struct msghdr smb_msg = {}; 775 struct bio_vec bv; 776 777 bvec_set_page(&bv, page, to_read, page_offset); 778 iov_iter_bvec(&smb_msg.msg_iter, ITER_DEST, &bv, 1, to_read); 779 return cifs_readv_from_socket(server, &smb_msg); 780 } 781 782 int 783 cifs_read_iter_from_socket(struct TCP_Server_Info *server, struct iov_iter *iter, 784 unsigned int to_read) 785 { 786 struct msghdr smb_msg = { .msg_iter = *iter }; 787 int ret; 788 789 iov_iter_truncate(&smb_msg.msg_iter, to_read); 790 ret = cifs_readv_from_socket(server, &smb_msg); 791 if (ret > 0) 792 iov_iter_advance(iter, ret); 793 return ret; 794 } 795 796 static bool 797 is_smb_response(struct TCP_Server_Info *server, unsigned char type) 798 { 799 /* 800 * The first byte big endian of the length field, 801 * is actually not part of the length but the type 802 * with the most common, zero, as regular data. 803 */ 804 switch (type) { 805 case RFC1002_SESSION_MESSAGE: 806 /* Regular SMB response */ 807 return true; 808 case RFC1002_SESSION_KEEP_ALIVE: 809 cifs_dbg(FYI, "RFC 1002 session keep alive\n"); 810 break; 811 case RFC1002_POSITIVE_SESSION_RESPONSE: 812 cifs_dbg(FYI, "RFC 1002 positive session response\n"); 813 break; 814 case RFC1002_NEGATIVE_SESSION_RESPONSE: 815 /* 816 * We get this from Windows 98 instead of an error on 817 * SMB negprot response. 818 */ 819 cifs_dbg(FYI, "RFC 1002 negative session response\n"); 820 /* give server a second to clean up */ 821 msleep(1000); 822 /* 823 * Always try 445 first on reconnect since we get NACK 824 * on some if we ever connected to port 139 (the NACK 825 * is since we do not begin with RFC1001 session 826 * initialize frame). 827 */ 828 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT); 829 cifs_reconnect(server, true); 830 break; 831 default: 832 cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type); 833 cifs_reconnect(server, true); 834 } 835 836 return false; 837 } 838 839 void 840 dequeue_mid(struct mid_q_entry *mid, bool malformed) 841 { 842 #ifdef CONFIG_CIFS_STATS2 843 mid->when_received = jiffies; 844 #endif 845 spin_lock(&mid->server->mid_lock); 846 if (!malformed) 847 mid->mid_state = MID_RESPONSE_RECEIVED; 848 else 849 mid->mid_state = MID_RESPONSE_MALFORMED; 850 /* 851 * Trying to handle/dequeue a mid after the send_recv() 852 * function has finished processing it is a bug. 853 */ 854 if (mid->mid_flags & MID_DELETED) { 855 spin_unlock(&mid->server->mid_lock); 856 pr_warn_once("trying to dequeue a deleted mid\n"); 857 } else { 858 list_del_init(&mid->qhead); 859 mid->mid_flags |= MID_DELETED; 860 spin_unlock(&mid->server->mid_lock); 861 } 862 } 863 864 static unsigned int 865 smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server) 866 { 867 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer; 868 869 /* 870 * SMB1 does not use credits. 871 */ 872 if (is_smb1(server)) 873 return 0; 874 875 return le16_to_cpu(shdr->CreditRequest); 876 } 877 878 static void 879 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server, 880 char *buf, int malformed) 881 { 882 if (server->ops->check_trans2 && 883 server->ops->check_trans2(mid, server, buf, malformed)) 884 return; 885 mid->credits_received = smb2_get_credits_from_hdr(buf, server); 886 mid->resp_buf = buf; 887 mid->large_buf = server->large_buf; 888 /* Was previous buf put in mpx struct for multi-rsp? */ 889 if (!mid->multiRsp) { 890 /* smb buffer will be freed by user thread */ 891 if (server->large_buf) 892 server->bigbuf = NULL; 893 else 894 server->smallbuf = NULL; 895 } 896 dequeue_mid(mid, malformed); 897 } 898 899 int 900 cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required) 901 { 902 bool srv_sign_required = server->sec_mode & server->vals->signing_required; 903 bool srv_sign_enabled = server->sec_mode & server->vals->signing_enabled; 904 bool mnt_sign_enabled; 905 906 /* 907 * Is signing required by mnt options? If not then check 908 * global_secflags to see if it is there. 909 */ 910 if (!mnt_sign_required) 911 mnt_sign_required = ((global_secflags & CIFSSEC_MUST_SIGN) == 912 CIFSSEC_MUST_SIGN); 913 914 /* 915 * If signing is required then it's automatically enabled too, 916 * otherwise, check to see if the secflags allow it. 917 */ 918 mnt_sign_enabled = mnt_sign_required ? mnt_sign_required : 919 (global_secflags & CIFSSEC_MAY_SIGN); 920 921 /* If server requires signing, does client allow it? */ 922 if (srv_sign_required) { 923 if (!mnt_sign_enabled) { 924 cifs_dbg(VFS, "Server requires signing, but it's disabled in SecurityFlags!\n"); 925 return -EOPNOTSUPP; 926 } 927 server->sign = true; 928 } 929 930 /* If client requires signing, does server allow it? */ 931 if (mnt_sign_required) { 932 if (!srv_sign_enabled) { 933 cifs_dbg(VFS, "Server does not support signing!\n"); 934 return -EOPNOTSUPP; 935 } 936 server->sign = true; 937 } 938 939 if (cifs_rdma_enabled(server) && server->sign) 940 cifs_dbg(VFS, "Signing is enabled, and RDMA read/write will be disabled\n"); 941 942 return 0; 943 } 944 945 static noinline_for_stack void 946 clean_demultiplex_info(struct TCP_Server_Info *server) 947 { 948 int length; 949 950 /* take it off the list, if it's not already */ 951 spin_lock(&server->srv_lock); 952 list_del_init(&server->tcp_ses_list); 953 spin_unlock(&server->srv_lock); 954 955 cancel_delayed_work_sync(&server->echo); 956 957 spin_lock(&server->srv_lock); 958 server->tcpStatus = CifsExiting; 959 spin_unlock(&server->srv_lock); 960 wake_up_all(&server->response_q); 961 962 /* check if we have blocked requests that need to free */ 963 spin_lock(&server->req_lock); 964 if (server->credits <= 0) 965 server->credits = 1; 966 spin_unlock(&server->req_lock); 967 /* 968 * Although there should not be any requests blocked on this queue it 969 * can not hurt to be paranoid and try to wake up requests that may 970 * haven been blocked when more than 50 at time were on the wire to the 971 * same server - they now will see the session is in exit state and get 972 * out of SendReceive. 973 */ 974 wake_up_all(&server->request_q); 975 /* give those requests time to exit */ 976 msleep(125); 977 if (cifs_rdma_enabled(server)) 978 smbd_destroy(server); 979 if (server->ssocket) { 980 sock_release(server->ssocket); 981 server->ssocket = NULL; 982 } 983 984 if (!list_empty(&server->pending_mid_q)) { 985 struct list_head dispose_list; 986 struct mid_q_entry *mid_entry; 987 struct list_head *tmp, *tmp2; 988 989 INIT_LIST_HEAD(&dispose_list); 990 spin_lock(&server->mid_lock); 991 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) { 992 mid_entry = list_entry(tmp, struct mid_q_entry, qhead); 993 cifs_dbg(FYI, "Clearing mid %llu\n", mid_entry->mid); 994 kref_get(&mid_entry->refcount); 995 mid_entry->mid_state = MID_SHUTDOWN; 996 list_move(&mid_entry->qhead, &dispose_list); 997 mid_entry->mid_flags |= MID_DELETED; 998 } 999 spin_unlock(&server->mid_lock); 1000 1001 /* now walk dispose list and issue callbacks */ 1002 list_for_each_safe(tmp, tmp2, &dispose_list) { 1003 mid_entry = list_entry(tmp, struct mid_q_entry, qhead); 1004 cifs_dbg(FYI, "Callback mid %llu\n", mid_entry->mid); 1005 list_del_init(&mid_entry->qhead); 1006 mid_entry->callback(mid_entry); 1007 release_mid(mid_entry); 1008 } 1009 /* 1/8th of sec is more than enough time for them to exit */ 1010 msleep(125); 1011 } 1012 1013 if (!list_empty(&server->pending_mid_q)) { 1014 /* 1015 * mpx threads have not exited yet give them at least the smb 1016 * send timeout time for long ops. 1017 * 1018 * Due to delays on oplock break requests, we need to wait at 1019 * least 45 seconds before giving up on a request getting a 1020 * response and going ahead and killing cifsd. 1021 */ 1022 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n"); 1023 msleep(46000); 1024 /* 1025 * If threads still have not exited they are probably never 1026 * coming home not much else we can do but free the memory. 1027 */ 1028 } 1029 1030 kfree(server->leaf_fullpath); 1031 kfree(server); 1032 1033 length = atomic_dec_return(&tcpSesAllocCount); 1034 if (length > 0) 1035 mempool_resize(cifs_req_poolp, length + cifs_min_rcv); 1036 } 1037 1038 static int 1039 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid) 1040 { 1041 int length; 1042 char *buf = server->smallbuf; 1043 unsigned int pdu_length = server->pdu_size; 1044 1045 /* make sure this will fit in a large buffer */ 1046 if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 1047 HEADER_PREAMBLE_SIZE(server)) { 1048 cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length); 1049 cifs_reconnect(server, true); 1050 return -ECONNABORTED; 1051 } 1052 1053 /* switch to large buffer if too big for a small one */ 1054 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) { 1055 server->large_buf = true; 1056 memcpy(server->bigbuf, buf, server->total_read); 1057 buf = server->bigbuf; 1058 } 1059 1060 /* now read the rest */ 1061 length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, 1062 pdu_length - MID_HEADER_SIZE(server)); 1063 1064 if (length < 0) 1065 return length; 1066 server->total_read += length; 1067 1068 dump_smb(buf, server->total_read); 1069 1070 return cifs_handle_standard(server, mid); 1071 } 1072 1073 int 1074 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid) 1075 { 1076 char *buf = server->large_buf ? server->bigbuf : server->smallbuf; 1077 int rc; 1078 1079 /* 1080 * We know that we received enough to get to the MID as we 1081 * checked the pdu_length earlier. Now check to see 1082 * if the rest of the header is OK. 1083 * 1084 * 48 bytes is enough to display the header and a little bit 1085 * into the payload for debugging purposes. 1086 */ 1087 rc = server->ops->check_message(buf, server->total_read, server); 1088 if (rc) 1089 cifs_dump_mem("Bad SMB: ", buf, 1090 min_t(unsigned int, server->total_read, 48)); 1091 1092 if (server->ops->is_session_expired && 1093 server->ops->is_session_expired(buf)) { 1094 cifs_reconnect(server, true); 1095 return -1; 1096 } 1097 1098 if (server->ops->is_status_pending && 1099 server->ops->is_status_pending(buf, server)) 1100 return -1; 1101 1102 if (!mid) 1103 return rc; 1104 1105 handle_mid(mid, server, buf, rc); 1106 return 0; 1107 } 1108 1109 static void 1110 smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server) 1111 { 1112 struct smb2_hdr *shdr = (struct smb2_hdr *)buffer; 1113 int scredits, in_flight; 1114 1115 /* 1116 * SMB1 does not use credits. 1117 */ 1118 if (is_smb1(server)) 1119 return; 1120 1121 if (shdr->CreditRequest) { 1122 spin_lock(&server->req_lock); 1123 server->credits += le16_to_cpu(shdr->CreditRequest); 1124 scredits = server->credits; 1125 in_flight = server->in_flight; 1126 spin_unlock(&server->req_lock); 1127 wake_up(&server->request_q); 1128 1129 trace_smb3_hdr_credits(server->CurrentMid, 1130 server->conn_id, server->hostname, scredits, 1131 le16_to_cpu(shdr->CreditRequest), in_flight); 1132 cifs_server_dbg(FYI, "%s: added %u credits total=%d\n", 1133 __func__, le16_to_cpu(shdr->CreditRequest), 1134 scredits); 1135 } 1136 } 1137 1138 1139 static int 1140 cifs_demultiplex_thread(void *p) 1141 { 1142 int i, num_mids, length; 1143 struct TCP_Server_Info *server = p; 1144 unsigned int pdu_length; 1145 unsigned int next_offset; 1146 char *buf = NULL; 1147 struct task_struct *task_to_wake = NULL; 1148 struct mid_q_entry *mids[MAX_COMPOUND]; 1149 char *bufs[MAX_COMPOUND]; 1150 unsigned int noreclaim_flag, num_io_timeout = 0; 1151 bool pending_reconnect = false; 1152 1153 noreclaim_flag = memalloc_noreclaim_save(); 1154 cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current)); 1155 1156 length = atomic_inc_return(&tcpSesAllocCount); 1157 if (length > 1) 1158 mempool_resize(cifs_req_poolp, length + cifs_min_rcv); 1159 1160 set_freezable(); 1161 allow_kernel_signal(SIGKILL); 1162 while (server->tcpStatus != CifsExiting) { 1163 if (try_to_freeze()) 1164 continue; 1165 1166 if (!allocate_buffers(server)) 1167 continue; 1168 1169 server->large_buf = false; 1170 buf = server->smallbuf; 1171 pdu_length = 4; /* enough to get RFC1001 header */ 1172 1173 length = cifs_read_from_socket(server, buf, pdu_length); 1174 if (length < 0) 1175 continue; 1176 1177 if (is_smb1(server)) 1178 server->total_read = length; 1179 else 1180 server->total_read = 0; 1181 1182 /* 1183 * The right amount was read from socket - 4 bytes, 1184 * so we can now interpret the length field. 1185 */ 1186 pdu_length = get_rfc1002_length(buf); 1187 1188 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length); 1189 if (!is_smb_response(server, buf[0])) 1190 continue; 1191 1192 pending_reconnect = false; 1193 next_pdu: 1194 server->pdu_size = pdu_length; 1195 1196 /* make sure we have enough to get to the MID */ 1197 if (server->pdu_size < MID_HEADER_SIZE(server)) { 1198 cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n", 1199 server->pdu_size); 1200 cifs_reconnect(server, true); 1201 continue; 1202 } 1203 1204 /* read down to the MID */ 1205 length = cifs_read_from_socket(server, 1206 buf + HEADER_PREAMBLE_SIZE(server), 1207 MID_HEADER_SIZE(server)); 1208 if (length < 0) 1209 continue; 1210 server->total_read += length; 1211 1212 if (server->ops->next_header) { 1213 if (server->ops->next_header(server, buf, &next_offset)) { 1214 cifs_dbg(VFS, "%s: malformed response (next_offset=%u)\n", 1215 __func__, next_offset); 1216 cifs_reconnect(server, true); 1217 continue; 1218 } 1219 if (next_offset) 1220 server->pdu_size = next_offset; 1221 } 1222 1223 memset(mids, 0, sizeof(mids)); 1224 memset(bufs, 0, sizeof(bufs)); 1225 num_mids = 0; 1226 1227 if (server->ops->is_transform_hdr && 1228 server->ops->receive_transform && 1229 server->ops->is_transform_hdr(buf)) { 1230 length = server->ops->receive_transform(server, 1231 mids, 1232 bufs, 1233 &num_mids); 1234 } else { 1235 mids[0] = server->ops->find_mid(server, buf); 1236 bufs[0] = buf; 1237 num_mids = 1; 1238 1239 if (!mids[0] || !mids[0]->receive) 1240 length = standard_receive3(server, mids[0]); 1241 else 1242 length = mids[0]->receive(server, mids[0]); 1243 } 1244 1245 if (length < 0) { 1246 for (i = 0; i < num_mids; i++) 1247 if (mids[i]) 1248 release_mid(mids[i]); 1249 continue; 1250 } 1251 1252 if (server->ops->is_status_io_timeout && 1253 server->ops->is_status_io_timeout(buf)) { 1254 num_io_timeout++; 1255 if (num_io_timeout > MAX_STATUS_IO_TIMEOUT) { 1256 cifs_server_dbg(VFS, 1257 "Number of request timeouts exceeded %d. Reconnecting", 1258 MAX_STATUS_IO_TIMEOUT); 1259 1260 pending_reconnect = true; 1261 num_io_timeout = 0; 1262 } 1263 } 1264 1265 server->lstrp = jiffies; 1266 1267 for (i = 0; i < num_mids; i++) { 1268 if (mids[i] != NULL) { 1269 mids[i]->resp_buf_size = server->pdu_size; 1270 1271 if (bufs[i] != NULL) { 1272 if (server->ops->is_network_name_deleted && 1273 server->ops->is_network_name_deleted(bufs[i], 1274 server)) { 1275 cifs_server_dbg(FYI, 1276 "Share deleted. Reconnect needed"); 1277 } 1278 } 1279 1280 if (!mids[i]->multiRsp || mids[i]->multiEnd) 1281 mids[i]->callback(mids[i]); 1282 1283 release_mid(mids[i]); 1284 } else if (server->ops->is_oplock_break && 1285 server->ops->is_oplock_break(bufs[i], 1286 server)) { 1287 smb2_add_credits_from_hdr(bufs[i], server); 1288 cifs_dbg(FYI, "Received oplock break\n"); 1289 } else { 1290 cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n", 1291 atomic_read(&mid_count)); 1292 cifs_dump_mem("Received Data is: ", bufs[i], 1293 HEADER_SIZE(server)); 1294 smb2_add_credits_from_hdr(bufs[i], server); 1295 #ifdef CONFIG_CIFS_DEBUG2 1296 if (server->ops->dump_detail) 1297 server->ops->dump_detail(bufs[i], 1298 server); 1299 cifs_dump_mids(server); 1300 #endif /* CIFS_DEBUG2 */ 1301 } 1302 } 1303 1304 if (pdu_length > server->pdu_size) { 1305 if (!allocate_buffers(server)) 1306 continue; 1307 pdu_length -= server->pdu_size; 1308 server->total_read = 0; 1309 server->large_buf = false; 1310 buf = server->smallbuf; 1311 goto next_pdu; 1312 } 1313 1314 /* do this reconnect at the very end after processing all MIDs */ 1315 if (pending_reconnect) 1316 cifs_reconnect(server, true); 1317 1318 } /* end while !EXITING */ 1319 1320 /* buffer usually freed in free_mid - need to free it here on exit */ 1321 cifs_buf_release(server->bigbuf); 1322 if (server->smallbuf) /* no sense logging a debug message if NULL */ 1323 cifs_small_buf_release(server->smallbuf); 1324 1325 task_to_wake = xchg(&server->tsk, NULL); 1326 clean_demultiplex_info(server); 1327 1328 /* if server->tsk was NULL then wait for a signal before exiting */ 1329 if (!task_to_wake) { 1330 set_current_state(TASK_INTERRUPTIBLE); 1331 while (!signal_pending(current)) { 1332 schedule(); 1333 set_current_state(TASK_INTERRUPTIBLE); 1334 } 1335 set_current_state(TASK_RUNNING); 1336 } 1337 1338 memalloc_noreclaim_restore(noreclaim_flag); 1339 module_put_and_kthread_exit(0); 1340 } 1341 1342 int 1343 cifs_ipaddr_cmp(struct sockaddr *srcaddr, struct sockaddr *rhs) 1344 { 1345 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr; 1346 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs; 1347 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr; 1348 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs; 1349 1350 switch (srcaddr->sa_family) { 1351 case AF_UNSPEC: 1352 switch (rhs->sa_family) { 1353 case AF_UNSPEC: 1354 return 0; 1355 case AF_INET: 1356 case AF_INET6: 1357 return 1; 1358 default: 1359 return -1; 1360 } 1361 case AF_INET: { 1362 switch (rhs->sa_family) { 1363 case AF_UNSPEC: 1364 return -1; 1365 case AF_INET: 1366 return memcmp(saddr4, vaddr4, 1367 sizeof(struct sockaddr_in)); 1368 case AF_INET6: 1369 return 1; 1370 default: 1371 return -1; 1372 } 1373 } 1374 case AF_INET6: { 1375 switch (rhs->sa_family) { 1376 case AF_UNSPEC: 1377 case AF_INET: 1378 return -1; 1379 case AF_INET6: 1380 return memcmp(saddr6, 1381 vaddr6, 1382 sizeof(struct sockaddr_in6)); 1383 default: 1384 return -1; 1385 } 1386 } 1387 default: 1388 return -1; /* don't expect to be here */ 1389 } 1390 } 1391 1392 /* 1393 * Returns true if srcaddr isn't specified and rhs isn't specified, or 1394 * if srcaddr is specified and matches the IP address of the rhs argument 1395 */ 1396 bool 1397 cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs) 1398 { 1399 switch (srcaddr->sa_family) { 1400 case AF_UNSPEC: 1401 return (rhs->sa_family == AF_UNSPEC); 1402 case AF_INET: { 1403 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr; 1404 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs; 1405 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr); 1406 } 1407 case AF_INET6: { 1408 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr; 1409 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs; 1410 return (ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr) 1411 && saddr6->sin6_scope_id == vaddr6->sin6_scope_id); 1412 } 1413 default: 1414 WARN_ON(1); 1415 return false; /* don't expect to be here */ 1416 } 1417 } 1418 1419 /* 1420 * If no port is specified in addr structure, we try to match with 445 port 1421 * and if it fails - with 139 ports. It should be called only if address 1422 * families of server and addr are equal. 1423 */ 1424 static bool 1425 match_port(struct TCP_Server_Info *server, struct sockaddr *addr) 1426 { 1427 __be16 port, *sport; 1428 1429 /* SMBDirect manages its own ports, don't match it here */ 1430 if (server->rdma) 1431 return true; 1432 1433 switch (addr->sa_family) { 1434 case AF_INET: 1435 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port; 1436 port = ((struct sockaddr_in *) addr)->sin_port; 1437 break; 1438 case AF_INET6: 1439 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port; 1440 port = ((struct sockaddr_in6 *) addr)->sin6_port; 1441 break; 1442 default: 1443 WARN_ON(1); 1444 return false; 1445 } 1446 1447 if (!port) { 1448 port = htons(CIFS_PORT); 1449 if (port == *sport) 1450 return true; 1451 1452 port = htons(RFC1001_PORT); 1453 } 1454 1455 return port == *sport; 1456 } 1457 1458 static bool match_server_address(struct TCP_Server_Info *server, struct sockaddr *addr) 1459 { 1460 if (!cifs_match_ipaddr(addr, (struct sockaddr *)&server->dstaddr)) 1461 return false; 1462 1463 return true; 1464 } 1465 1466 static bool 1467 match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx) 1468 { 1469 /* 1470 * The select_sectype function should either return the ctx->sectype 1471 * that was specified, or "Unspecified" if that sectype was not 1472 * compatible with the given NEGOTIATE request. 1473 */ 1474 if (server->ops->select_sectype(server, ctx->sectype) 1475 == Unspecified) 1476 return false; 1477 1478 /* 1479 * Now check if signing mode is acceptable. No need to check 1480 * global_secflags at this point since if MUST_SIGN is set then 1481 * the server->sign had better be too. 1482 */ 1483 if (ctx->sign && !server->sign) 1484 return false; 1485 1486 return true; 1487 } 1488 1489 /* this function must be called with srv_lock held */ 1490 static int match_server(struct TCP_Server_Info *server, 1491 struct smb3_fs_context *ctx, 1492 bool match_super) 1493 { 1494 struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr; 1495 1496 lockdep_assert_held(&server->srv_lock); 1497 1498 if (ctx->nosharesock) 1499 return 0; 1500 1501 /* this server does not share socket */ 1502 if (server->nosharesock) 1503 return 0; 1504 1505 /* If multidialect negotiation see if existing sessions match one */ 1506 if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) { 1507 if (server->vals->protocol_id < SMB30_PROT_ID) 1508 return 0; 1509 } else if (strcmp(ctx->vals->version_string, 1510 SMBDEFAULT_VERSION_STRING) == 0) { 1511 if (server->vals->protocol_id < SMB21_PROT_ID) 1512 return 0; 1513 } else if ((server->vals != ctx->vals) || (server->ops != ctx->ops)) 1514 return 0; 1515 1516 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns)) 1517 return 0; 1518 1519 if (!cifs_match_ipaddr((struct sockaddr *)&ctx->srcaddr, 1520 (struct sockaddr *)&server->srcaddr)) 1521 return 0; 1522 /* 1523 * When matching cifs.ko superblocks (@match_super == true), we can't 1524 * really match either @server->leaf_fullpath or @server->dstaddr 1525 * directly since this @server might belong to a completely different 1526 * server -- in case of domain-based DFS referrals or DFS links -- as 1527 * provided earlier by mount(2) through 'source' and 'ip' options. 1528 * 1529 * Otherwise, match the DFS referral in @server->leaf_fullpath or the 1530 * destination address in @server->dstaddr. 1531 * 1532 * When using 'nodfs' mount option, we avoid sharing it with DFS 1533 * connections as they might failover. 1534 */ 1535 if (!match_super) { 1536 if (!ctx->nodfs) { 1537 if (server->leaf_fullpath) { 1538 if (!ctx->leaf_fullpath || 1539 strcasecmp(server->leaf_fullpath, 1540 ctx->leaf_fullpath)) 1541 return 0; 1542 } else if (ctx->leaf_fullpath) { 1543 return 0; 1544 } 1545 } else if (server->leaf_fullpath) { 1546 return 0; 1547 } 1548 } 1549 1550 /* 1551 * Match for a regular connection (address/hostname/port) which has no 1552 * DFS referrals set. 1553 */ 1554 if (!server->leaf_fullpath && 1555 (strcasecmp(server->hostname, ctx->server_hostname) || 1556 !match_server_address(server, addr) || 1557 !match_port(server, addr))) 1558 return 0; 1559 1560 if (!match_security(server, ctx)) 1561 return 0; 1562 1563 if (server->echo_interval != ctx->echo_interval * HZ) 1564 return 0; 1565 1566 if (server->rdma != ctx->rdma) 1567 return 0; 1568 1569 if (server->ignore_signature != ctx->ignore_signature) 1570 return 0; 1571 1572 if (server->min_offload != ctx->min_offload) 1573 return 0; 1574 1575 return 1; 1576 } 1577 1578 struct TCP_Server_Info * 1579 cifs_find_tcp_session(struct smb3_fs_context *ctx) 1580 { 1581 struct TCP_Server_Info *server; 1582 1583 spin_lock(&cifs_tcp_ses_lock); 1584 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) { 1585 spin_lock(&server->srv_lock); 1586 /* 1587 * Skip ses channels since they're only handled in lower layers 1588 * (e.g. cifs_send_recv). 1589 */ 1590 if (SERVER_IS_CHAN(server) || 1591 !match_server(server, ctx, false)) { 1592 spin_unlock(&server->srv_lock); 1593 continue; 1594 } 1595 spin_unlock(&server->srv_lock); 1596 1597 ++server->srv_count; 1598 spin_unlock(&cifs_tcp_ses_lock); 1599 cifs_dbg(FYI, "Existing tcp session with server found\n"); 1600 return server; 1601 } 1602 spin_unlock(&cifs_tcp_ses_lock); 1603 return NULL; 1604 } 1605 1606 void 1607 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect) 1608 { 1609 struct task_struct *task; 1610 1611 spin_lock(&cifs_tcp_ses_lock); 1612 if (--server->srv_count > 0) { 1613 spin_unlock(&cifs_tcp_ses_lock); 1614 return; 1615 } 1616 1617 /* srv_count can never go negative */ 1618 WARN_ON(server->srv_count < 0); 1619 1620 put_net(cifs_net_ns(server)); 1621 1622 list_del_init(&server->tcp_ses_list); 1623 spin_unlock(&cifs_tcp_ses_lock); 1624 1625 cancel_delayed_work_sync(&server->echo); 1626 1627 if (from_reconnect) 1628 /* 1629 * Avoid deadlock here: reconnect work calls 1630 * cifs_put_tcp_session() at its end. Need to be sure 1631 * that reconnect work does nothing with server pointer after 1632 * that step. 1633 */ 1634 cancel_delayed_work(&server->reconnect); 1635 else 1636 cancel_delayed_work_sync(&server->reconnect); 1637 1638 /* For secondary channels, we pick up ref-count on the primary server */ 1639 if (SERVER_IS_CHAN(server)) 1640 cifs_put_tcp_session(server->primary_server, from_reconnect); 1641 1642 spin_lock(&server->srv_lock); 1643 server->tcpStatus = CifsExiting; 1644 spin_unlock(&server->srv_lock); 1645 1646 cifs_crypto_secmech_release(server); 1647 1648 kfree_sensitive(server->session_key.response); 1649 server->session_key.response = NULL; 1650 server->session_key.len = 0; 1651 kfree(server->hostname); 1652 server->hostname = NULL; 1653 1654 task = xchg(&server->tsk, NULL); 1655 if (task) 1656 send_sig(SIGKILL, task, 1); 1657 } 1658 1659 struct TCP_Server_Info * 1660 cifs_get_tcp_session(struct smb3_fs_context *ctx, 1661 struct TCP_Server_Info *primary_server) 1662 { 1663 struct TCP_Server_Info *tcp_ses = NULL; 1664 int rc; 1665 1666 cifs_dbg(FYI, "UNC: %s\n", ctx->UNC); 1667 1668 /* see if we already have a matching tcp_ses */ 1669 tcp_ses = cifs_find_tcp_session(ctx); 1670 if (tcp_ses) 1671 return tcp_ses; 1672 1673 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL); 1674 if (!tcp_ses) { 1675 rc = -ENOMEM; 1676 goto out_err; 1677 } 1678 1679 tcp_ses->hostname = kstrdup(ctx->server_hostname, GFP_KERNEL); 1680 if (!tcp_ses->hostname) { 1681 rc = -ENOMEM; 1682 goto out_err; 1683 } 1684 1685 if (ctx->leaf_fullpath) { 1686 tcp_ses->leaf_fullpath = kstrdup(ctx->leaf_fullpath, GFP_KERNEL); 1687 if (!tcp_ses->leaf_fullpath) { 1688 rc = -ENOMEM; 1689 goto out_err; 1690 } 1691 } 1692 1693 if (ctx->nosharesock) 1694 tcp_ses->nosharesock = true; 1695 1696 tcp_ses->ops = ctx->ops; 1697 tcp_ses->vals = ctx->vals; 1698 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns)); 1699 1700 tcp_ses->conn_id = atomic_inc_return(&tcpSesNextId); 1701 tcp_ses->noblockcnt = ctx->rootfs; 1702 tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs; 1703 tcp_ses->noautotune = ctx->noautotune; 1704 tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay; 1705 tcp_ses->rdma = ctx->rdma; 1706 tcp_ses->in_flight = 0; 1707 tcp_ses->max_in_flight = 0; 1708 tcp_ses->credits = 1; 1709 if (primary_server) { 1710 spin_lock(&cifs_tcp_ses_lock); 1711 ++primary_server->srv_count; 1712 spin_unlock(&cifs_tcp_ses_lock); 1713 tcp_ses->primary_server = primary_server; 1714 } 1715 init_waitqueue_head(&tcp_ses->response_q); 1716 init_waitqueue_head(&tcp_ses->request_q); 1717 INIT_LIST_HEAD(&tcp_ses->pending_mid_q); 1718 mutex_init(&tcp_ses->_srv_mutex); 1719 memcpy(tcp_ses->workstation_RFC1001_name, 1720 ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); 1721 memcpy(tcp_ses->server_RFC1001_name, 1722 ctx->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); 1723 tcp_ses->session_estab = false; 1724 tcp_ses->sequence_number = 0; 1725 tcp_ses->channel_sequence_num = 0; /* only tracked for primary channel */ 1726 tcp_ses->reconnect_instance = 1; 1727 tcp_ses->lstrp = jiffies; 1728 tcp_ses->compress_algorithm = cpu_to_le16(ctx->compression); 1729 spin_lock_init(&tcp_ses->req_lock); 1730 spin_lock_init(&tcp_ses->srv_lock); 1731 spin_lock_init(&tcp_ses->mid_lock); 1732 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list); 1733 INIT_LIST_HEAD(&tcp_ses->smb_ses_list); 1734 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request); 1735 INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server); 1736 mutex_init(&tcp_ses->reconnect_mutex); 1737 #ifdef CONFIG_CIFS_DFS_UPCALL 1738 mutex_init(&tcp_ses->refpath_lock); 1739 #endif 1740 memcpy(&tcp_ses->srcaddr, &ctx->srcaddr, 1741 sizeof(tcp_ses->srcaddr)); 1742 memcpy(&tcp_ses->dstaddr, &ctx->dstaddr, 1743 sizeof(tcp_ses->dstaddr)); 1744 if (ctx->use_client_guid) 1745 memcpy(tcp_ses->client_guid, ctx->client_guid, 1746 SMB2_CLIENT_GUID_SIZE); 1747 else 1748 generate_random_uuid(tcp_ses->client_guid); 1749 /* 1750 * at this point we are the only ones with the pointer 1751 * to the struct since the kernel thread not created yet 1752 * no need to spinlock this init of tcpStatus or srv_count 1753 */ 1754 tcp_ses->tcpStatus = CifsNew; 1755 ++tcp_ses->srv_count; 1756 1757 if (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN && 1758 ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX) 1759 tcp_ses->echo_interval = ctx->echo_interval * HZ; 1760 else 1761 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ; 1762 if (tcp_ses->rdma) { 1763 #ifndef CONFIG_CIFS_SMB_DIRECT 1764 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n"); 1765 rc = -ENOENT; 1766 goto out_err_crypto_release; 1767 #endif 1768 tcp_ses->smbd_conn = smbd_get_connection( 1769 tcp_ses, (struct sockaddr *)&ctx->dstaddr); 1770 if (tcp_ses->smbd_conn) { 1771 cifs_dbg(VFS, "RDMA transport established\n"); 1772 rc = 0; 1773 goto smbd_connected; 1774 } else { 1775 rc = -ENOENT; 1776 goto out_err_crypto_release; 1777 } 1778 } 1779 rc = ip_connect(tcp_ses); 1780 if (rc < 0) { 1781 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n"); 1782 goto out_err_crypto_release; 1783 } 1784 smbd_connected: 1785 /* 1786 * since we're in a cifs function already, we know that 1787 * this will succeed. No need for try_module_get(). 1788 */ 1789 __module_get(THIS_MODULE); 1790 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread, 1791 tcp_ses, "cifsd"); 1792 if (IS_ERR(tcp_ses->tsk)) { 1793 rc = PTR_ERR(tcp_ses->tsk); 1794 cifs_dbg(VFS, "error %d create cifsd thread\n", rc); 1795 module_put(THIS_MODULE); 1796 goto out_err_crypto_release; 1797 } 1798 tcp_ses->min_offload = ctx->min_offload; 1799 /* 1800 * at this point we are the only ones with the pointer 1801 * to the struct since the kernel thread not created yet 1802 * no need to spinlock this update of tcpStatus 1803 */ 1804 spin_lock(&tcp_ses->srv_lock); 1805 tcp_ses->tcpStatus = CifsNeedNegotiate; 1806 spin_unlock(&tcp_ses->srv_lock); 1807 1808 if ((ctx->max_credits < 20) || (ctx->max_credits > 60000)) 1809 tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE; 1810 else 1811 tcp_ses->max_credits = ctx->max_credits; 1812 1813 tcp_ses->nr_targets = 1; 1814 tcp_ses->ignore_signature = ctx->ignore_signature; 1815 /* thread spawned, put it on the list */ 1816 spin_lock(&cifs_tcp_ses_lock); 1817 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list); 1818 spin_unlock(&cifs_tcp_ses_lock); 1819 1820 /* queue echo request delayed work */ 1821 queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval); 1822 1823 return tcp_ses; 1824 1825 out_err_crypto_release: 1826 cifs_crypto_secmech_release(tcp_ses); 1827 1828 put_net(cifs_net_ns(tcp_ses)); 1829 1830 out_err: 1831 if (tcp_ses) { 1832 if (SERVER_IS_CHAN(tcp_ses)) 1833 cifs_put_tcp_session(tcp_ses->primary_server, false); 1834 kfree(tcp_ses->hostname); 1835 kfree(tcp_ses->leaf_fullpath); 1836 if (tcp_ses->ssocket) 1837 sock_release(tcp_ses->ssocket); 1838 kfree(tcp_ses); 1839 } 1840 return ERR_PTR(rc); 1841 } 1842 1843 /* this function must be called with ses_lock and chan_lock held */ 1844 static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx) 1845 { 1846 if (ctx->sectype != Unspecified && 1847 ctx->sectype != ses->sectype) 1848 return 0; 1849 1850 /* 1851 * If an existing session is limited to less channels than 1852 * requested, it should not be reused 1853 */ 1854 if (ses->chan_max < ctx->max_channels) 1855 return 0; 1856 1857 switch (ses->sectype) { 1858 case Kerberos: 1859 if (!uid_eq(ctx->cred_uid, ses->cred_uid)) 1860 return 0; 1861 break; 1862 default: 1863 /* NULL username means anonymous session */ 1864 if (ses->user_name == NULL) { 1865 if (!ctx->nullauth) 1866 return 0; 1867 break; 1868 } 1869 1870 /* anything else takes username/password */ 1871 if (strncmp(ses->user_name, 1872 ctx->username ? ctx->username : "", 1873 CIFS_MAX_USERNAME_LEN)) 1874 return 0; 1875 if ((ctx->username && strlen(ctx->username) != 0) && 1876 ses->password != NULL && 1877 strncmp(ses->password, 1878 ctx->password ? ctx->password : "", 1879 CIFS_MAX_PASSWORD_LEN)) 1880 return 0; 1881 } 1882 1883 if (strcmp(ctx->local_nls->charset, ses->local_nls->charset)) 1884 return 0; 1885 1886 return 1; 1887 } 1888 1889 /** 1890 * cifs_setup_ipc - helper to setup the IPC tcon for the session 1891 * @ses: smb session to issue the request on 1892 * @ctx: the superblock configuration context to use for building the 1893 * new tree connection for the IPC (interprocess communication RPC) 1894 * 1895 * A new IPC connection is made and stored in the session 1896 * tcon_ipc. The IPC tcon has the same lifetime as the session. 1897 */ 1898 static int 1899 cifs_setup_ipc(struct cifs_ses *ses, struct smb3_fs_context *ctx) 1900 { 1901 int rc = 0, xid; 1902 struct cifs_tcon *tcon; 1903 char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0}; 1904 bool seal = false; 1905 struct TCP_Server_Info *server = ses->server; 1906 1907 /* 1908 * If the mount request that resulted in the creation of the 1909 * session requires encryption, force IPC to be encrypted too. 1910 */ 1911 if (ctx->seal) { 1912 if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) 1913 seal = true; 1914 else { 1915 cifs_server_dbg(VFS, 1916 "IPC: server doesn't support encryption\n"); 1917 return -EOPNOTSUPP; 1918 } 1919 } 1920 1921 /* no need to setup directory caching on IPC share, so pass in false */ 1922 tcon = tcon_info_alloc(false); 1923 if (tcon == NULL) 1924 return -ENOMEM; 1925 1926 spin_lock(&server->srv_lock); 1927 scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname); 1928 spin_unlock(&server->srv_lock); 1929 1930 xid = get_xid(); 1931 tcon->ses = ses; 1932 tcon->ipc = true; 1933 tcon->seal = seal; 1934 rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls); 1935 free_xid(xid); 1936 1937 if (rc) { 1938 cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc); 1939 tconInfoFree(tcon); 1940 goto out; 1941 } 1942 1943 cifs_dbg(FYI, "IPC tcon rc=%d ipc tid=0x%x\n", rc, tcon->tid); 1944 1945 spin_lock(&tcon->tc_lock); 1946 tcon->status = TID_GOOD; 1947 spin_unlock(&tcon->tc_lock); 1948 ses->tcon_ipc = tcon; 1949 out: 1950 return rc; 1951 } 1952 1953 /** 1954 * cifs_free_ipc - helper to release the session IPC tcon 1955 * @ses: smb session to unmount the IPC from 1956 * 1957 * Needs to be called everytime a session is destroyed. 1958 * 1959 * On session close, the IPC is closed and the server must release all tcons of the session. 1960 * No need to send a tree disconnect here. 1961 * 1962 * Besides, it will make the server to not close durable and resilient files on session close, as 1963 * specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request. 1964 */ 1965 static int 1966 cifs_free_ipc(struct cifs_ses *ses) 1967 { 1968 struct cifs_tcon *tcon = ses->tcon_ipc; 1969 1970 if (tcon == NULL) 1971 return 0; 1972 1973 tconInfoFree(tcon); 1974 ses->tcon_ipc = NULL; 1975 return 0; 1976 } 1977 1978 static struct cifs_ses * 1979 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx) 1980 { 1981 struct cifs_ses *ses, *ret = NULL; 1982 1983 spin_lock(&cifs_tcp_ses_lock); 1984 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { 1985 spin_lock(&ses->ses_lock); 1986 if (ses->ses_status == SES_EXITING) { 1987 spin_unlock(&ses->ses_lock); 1988 continue; 1989 } 1990 spin_lock(&ses->chan_lock); 1991 if (match_session(ses, ctx)) { 1992 spin_unlock(&ses->chan_lock); 1993 spin_unlock(&ses->ses_lock); 1994 ret = ses; 1995 break; 1996 } 1997 spin_unlock(&ses->chan_lock); 1998 spin_unlock(&ses->ses_lock); 1999 } 2000 if (ret) 2001 cifs_smb_ses_inc_refcount(ret); 2002 spin_unlock(&cifs_tcp_ses_lock); 2003 return ret; 2004 } 2005 2006 void __cifs_put_smb_ses(struct cifs_ses *ses) 2007 { 2008 unsigned int rc, xid; 2009 unsigned int chan_count; 2010 struct TCP_Server_Info *server = ses->server; 2011 2012 spin_lock(&ses->ses_lock); 2013 if (ses->ses_status == SES_EXITING) { 2014 spin_unlock(&ses->ses_lock); 2015 return; 2016 } 2017 spin_unlock(&ses->ses_lock); 2018 2019 cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count); 2020 cifs_dbg(FYI, 2021 "%s: ses ipc: %s\n", __func__, ses->tcon_ipc ? ses->tcon_ipc->tree_name : "NONE"); 2022 2023 spin_lock(&cifs_tcp_ses_lock); 2024 if (--ses->ses_count > 0) { 2025 spin_unlock(&cifs_tcp_ses_lock); 2026 return; 2027 } 2028 spin_lock(&ses->ses_lock); 2029 if (ses->ses_status == SES_GOOD) 2030 ses->ses_status = SES_EXITING; 2031 spin_unlock(&ses->ses_lock); 2032 spin_unlock(&cifs_tcp_ses_lock); 2033 2034 /* ses_count can never go negative */ 2035 WARN_ON(ses->ses_count < 0); 2036 2037 spin_lock(&ses->ses_lock); 2038 if (ses->ses_status == SES_EXITING && server->ops->logoff) { 2039 spin_unlock(&ses->ses_lock); 2040 cifs_free_ipc(ses); 2041 xid = get_xid(); 2042 rc = server->ops->logoff(xid, ses); 2043 if (rc) 2044 cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n", 2045 __func__, rc); 2046 _free_xid(xid); 2047 } else { 2048 spin_unlock(&ses->ses_lock); 2049 cifs_free_ipc(ses); 2050 } 2051 2052 spin_lock(&cifs_tcp_ses_lock); 2053 list_del_init(&ses->smb_ses_list); 2054 spin_unlock(&cifs_tcp_ses_lock); 2055 2056 chan_count = ses->chan_count; 2057 2058 /* close any extra channels */ 2059 if (chan_count > 1) { 2060 int i; 2061 2062 for (i = 1; i < chan_count; i++) { 2063 if (ses->chans[i].iface) { 2064 kref_put(&ses->chans[i].iface->refcount, release_iface); 2065 ses->chans[i].iface = NULL; 2066 } 2067 cifs_put_tcp_session(ses->chans[i].server, 0); 2068 ses->chans[i].server = NULL; 2069 } 2070 } 2071 2072 /* we now account for primary channel in iface->refcount */ 2073 if (ses->chans[0].iface) { 2074 kref_put(&ses->chans[0].iface->refcount, release_iface); 2075 ses->chans[0].server = NULL; 2076 } 2077 2078 sesInfoFree(ses); 2079 cifs_put_tcp_session(server, 0); 2080 } 2081 2082 #ifdef CONFIG_KEYS 2083 2084 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */ 2085 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1) 2086 2087 /* Populate username and pw fields from keyring if possible */ 2088 static int 2089 cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses) 2090 { 2091 int rc = 0; 2092 int is_domain = 0; 2093 const char *delim, *payload; 2094 char *desc; 2095 ssize_t len; 2096 struct key *key; 2097 struct TCP_Server_Info *server = ses->server; 2098 struct sockaddr_in *sa; 2099 struct sockaddr_in6 *sa6; 2100 const struct user_key_payload *upayload; 2101 2102 desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL); 2103 if (!desc) 2104 return -ENOMEM; 2105 2106 /* try to find an address key first */ 2107 switch (server->dstaddr.ss_family) { 2108 case AF_INET: 2109 sa = (struct sockaddr_in *)&server->dstaddr; 2110 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr); 2111 break; 2112 case AF_INET6: 2113 sa6 = (struct sockaddr_in6 *)&server->dstaddr; 2114 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr); 2115 break; 2116 default: 2117 cifs_dbg(FYI, "Bad ss_family (%hu)\n", 2118 server->dstaddr.ss_family); 2119 rc = -EINVAL; 2120 goto out_err; 2121 } 2122 2123 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc); 2124 key = request_key(&key_type_logon, desc, ""); 2125 if (IS_ERR(key)) { 2126 if (!ses->domainName) { 2127 cifs_dbg(FYI, "domainName is NULL\n"); 2128 rc = PTR_ERR(key); 2129 goto out_err; 2130 } 2131 2132 /* didn't work, try to find a domain key */ 2133 sprintf(desc, "cifs:d:%s", ses->domainName); 2134 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc); 2135 key = request_key(&key_type_logon, desc, ""); 2136 if (IS_ERR(key)) { 2137 rc = PTR_ERR(key); 2138 goto out_err; 2139 } 2140 is_domain = 1; 2141 } 2142 2143 down_read(&key->sem); 2144 upayload = user_key_payload_locked(key); 2145 if (IS_ERR_OR_NULL(upayload)) { 2146 rc = upayload ? PTR_ERR(upayload) : -EINVAL; 2147 goto out_key_put; 2148 } 2149 2150 /* find first : in payload */ 2151 payload = upayload->data; 2152 delim = strnchr(payload, upayload->datalen, ':'); 2153 cifs_dbg(FYI, "payload=%s\n", payload); 2154 if (!delim) { 2155 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n", 2156 upayload->datalen); 2157 rc = -EINVAL; 2158 goto out_key_put; 2159 } 2160 2161 len = delim - payload; 2162 if (len > CIFS_MAX_USERNAME_LEN || len <= 0) { 2163 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n", 2164 len); 2165 rc = -EINVAL; 2166 goto out_key_put; 2167 } 2168 2169 ctx->username = kstrndup(payload, len, GFP_KERNEL); 2170 if (!ctx->username) { 2171 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n", 2172 len); 2173 rc = -ENOMEM; 2174 goto out_key_put; 2175 } 2176 cifs_dbg(FYI, "%s: username=%s\n", __func__, ctx->username); 2177 2178 len = key->datalen - (len + 1); 2179 if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) { 2180 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len); 2181 rc = -EINVAL; 2182 kfree(ctx->username); 2183 ctx->username = NULL; 2184 goto out_key_put; 2185 } 2186 2187 ++delim; 2188 ctx->password = kstrndup(delim, len, GFP_KERNEL); 2189 if (!ctx->password) { 2190 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n", 2191 len); 2192 rc = -ENOMEM; 2193 kfree(ctx->username); 2194 ctx->username = NULL; 2195 goto out_key_put; 2196 } 2197 2198 /* 2199 * If we have a domain key then we must set the domainName in the 2200 * for the request. 2201 */ 2202 if (is_domain && ses->domainName) { 2203 ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL); 2204 if (!ctx->domainname) { 2205 cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n", 2206 len); 2207 rc = -ENOMEM; 2208 kfree(ctx->username); 2209 ctx->username = NULL; 2210 kfree_sensitive(ctx->password); 2211 ctx->password = NULL; 2212 goto out_key_put; 2213 } 2214 } 2215 2216 strscpy(ctx->workstation_name, ses->workstation_name, sizeof(ctx->workstation_name)); 2217 2218 out_key_put: 2219 up_read(&key->sem); 2220 key_put(key); 2221 out_err: 2222 kfree(desc); 2223 cifs_dbg(FYI, "%s: returning %d\n", __func__, rc); 2224 return rc; 2225 } 2226 #else /* ! CONFIG_KEYS */ 2227 static inline int 2228 cifs_set_cifscreds(struct smb3_fs_context *ctx __attribute__((unused)), 2229 struct cifs_ses *ses __attribute__((unused))) 2230 { 2231 return -ENOSYS; 2232 } 2233 #endif /* CONFIG_KEYS */ 2234 2235 /** 2236 * cifs_get_smb_ses - get a session matching @ctx data from @server 2237 * @server: server to setup the session to 2238 * @ctx: superblock configuration context to use to setup the session 2239 * 2240 * This function assumes it is being called from cifs_mount() where we 2241 * already got a server reference (server refcount +1). See 2242 * cifs_get_tcon() for refcount explanations. 2243 */ 2244 struct cifs_ses * 2245 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx) 2246 { 2247 int rc = 0; 2248 unsigned int xid; 2249 struct cifs_ses *ses; 2250 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr; 2251 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr; 2252 2253 xid = get_xid(); 2254 2255 ses = cifs_find_smb_ses(server, ctx); 2256 if (ses) { 2257 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n", 2258 ses->ses_status); 2259 2260 spin_lock(&ses->chan_lock); 2261 if (cifs_chan_needs_reconnect(ses, server)) { 2262 spin_unlock(&ses->chan_lock); 2263 cifs_dbg(FYI, "Session needs reconnect\n"); 2264 2265 mutex_lock(&ses->session_mutex); 2266 rc = cifs_negotiate_protocol(xid, ses, server); 2267 if (rc) { 2268 mutex_unlock(&ses->session_mutex); 2269 /* problem -- put our ses reference */ 2270 cifs_put_smb_ses(ses); 2271 free_xid(xid); 2272 return ERR_PTR(rc); 2273 } 2274 2275 rc = cifs_setup_session(xid, ses, server, 2276 ctx->local_nls); 2277 if (rc) { 2278 mutex_unlock(&ses->session_mutex); 2279 /* problem -- put our reference */ 2280 cifs_put_smb_ses(ses); 2281 free_xid(xid); 2282 return ERR_PTR(rc); 2283 } 2284 mutex_unlock(&ses->session_mutex); 2285 2286 spin_lock(&ses->chan_lock); 2287 } 2288 spin_unlock(&ses->chan_lock); 2289 2290 /* existing SMB ses has a server reference already */ 2291 cifs_put_tcp_session(server, 0); 2292 free_xid(xid); 2293 return ses; 2294 } 2295 2296 rc = -ENOMEM; 2297 2298 cifs_dbg(FYI, "Existing smb sess not found\n"); 2299 ses = sesInfoAlloc(); 2300 if (ses == NULL) 2301 goto get_ses_fail; 2302 2303 /* new SMB session uses our server ref */ 2304 ses->server = server; 2305 if (server->dstaddr.ss_family == AF_INET6) 2306 sprintf(ses->ip_addr, "%pI6", &addr6->sin6_addr); 2307 else 2308 sprintf(ses->ip_addr, "%pI4", &addr->sin_addr); 2309 2310 if (ctx->username) { 2311 ses->user_name = kstrdup(ctx->username, GFP_KERNEL); 2312 if (!ses->user_name) 2313 goto get_ses_fail; 2314 } 2315 2316 /* ctx->password freed at unmount */ 2317 if (ctx->password) { 2318 ses->password = kstrdup(ctx->password, GFP_KERNEL); 2319 if (!ses->password) 2320 goto get_ses_fail; 2321 } 2322 if (ctx->domainname) { 2323 ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL); 2324 if (!ses->domainName) 2325 goto get_ses_fail; 2326 } 2327 2328 strscpy(ses->workstation_name, ctx->workstation_name, sizeof(ses->workstation_name)); 2329 2330 if (ctx->domainauto) 2331 ses->domainAuto = ctx->domainauto; 2332 ses->cred_uid = ctx->cred_uid; 2333 ses->linux_uid = ctx->linux_uid; 2334 2335 ses->sectype = ctx->sectype; 2336 ses->sign = ctx->sign; 2337 ses->local_nls = load_nls(ctx->local_nls->charset); 2338 2339 /* add server as first channel */ 2340 spin_lock(&ses->chan_lock); 2341 ses->chans[0].server = server; 2342 ses->chan_count = 1; 2343 ses->chan_max = ctx->multichannel ? ctx->max_channels:1; 2344 ses->chans_need_reconnect = 1; 2345 spin_unlock(&ses->chan_lock); 2346 2347 mutex_lock(&ses->session_mutex); 2348 rc = cifs_negotiate_protocol(xid, ses, server); 2349 if (!rc) 2350 rc = cifs_setup_session(xid, ses, server, ctx->local_nls); 2351 mutex_unlock(&ses->session_mutex); 2352 2353 /* each channel uses a different signing key */ 2354 spin_lock(&ses->chan_lock); 2355 memcpy(ses->chans[0].signkey, ses->smb3signingkey, 2356 sizeof(ses->smb3signingkey)); 2357 spin_unlock(&ses->chan_lock); 2358 2359 if (rc) 2360 goto get_ses_fail; 2361 2362 /* 2363 * success, put it on the list and add it as first channel 2364 * note: the session becomes active soon after this. So you'll 2365 * need to lock before changing something in the session. 2366 */ 2367 spin_lock(&cifs_tcp_ses_lock); 2368 ses->dfs_root_ses = ctx->dfs_root_ses; 2369 if (ses->dfs_root_ses) 2370 ses->dfs_root_ses->ses_count++; 2371 list_add(&ses->smb_ses_list, &server->smb_ses_list); 2372 spin_unlock(&cifs_tcp_ses_lock); 2373 2374 cifs_setup_ipc(ses, ctx); 2375 2376 free_xid(xid); 2377 2378 return ses; 2379 2380 get_ses_fail: 2381 sesInfoFree(ses); 2382 free_xid(xid); 2383 return ERR_PTR(rc); 2384 } 2385 2386 /* this function must be called with tc_lock held */ 2387 static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) 2388 { 2389 struct TCP_Server_Info *server = tcon->ses->server; 2390 2391 if (tcon->status == TID_EXITING) 2392 return 0; 2393 2394 if (tcon->origin_fullpath) { 2395 if (!ctx->source || 2396 !dfs_src_pathname_equal(ctx->source, 2397 tcon->origin_fullpath)) 2398 return 0; 2399 } else if (!server->leaf_fullpath && 2400 strncmp(tcon->tree_name, ctx->UNC, MAX_TREE_SIZE)) { 2401 return 0; 2402 } 2403 if (tcon->seal != ctx->seal) 2404 return 0; 2405 if (tcon->snapshot_time != ctx->snapshot_time) 2406 return 0; 2407 if (tcon->handle_timeout != ctx->handle_timeout) 2408 return 0; 2409 if (tcon->no_lease != ctx->no_lease) 2410 return 0; 2411 if (tcon->nodelete != ctx->nodelete) 2412 return 0; 2413 return 1; 2414 } 2415 2416 static struct cifs_tcon * 2417 cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx) 2418 { 2419 struct cifs_tcon *tcon; 2420 2421 spin_lock(&cifs_tcp_ses_lock); 2422 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { 2423 spin_lock(&tcon->tc_lock); 2424 if (!match_tcon(tcon, ctx)) { 2425 spin_unlock(&tcon->tc_lock); 2426 continue; 2427 } 2428 ++tcon->tc_count; 2429 spin_unlock(&tcon->tc_lock); 2430 spin_unlock(&cifs_tcp_ses_lock); 2431 return tcon; 2432 } 2433 spin_unlock(&cifs_tcp_ses_lock); 2434 return NULL; 2435 } 2436 2437 void 2438 cifs_put_tcon(struct cifs_tcon *tcon) 2439 { 2440 unsigned int xid; 2441 struct cifs_ses *ses; 2442 2443 /* 2444 * IPC tcon share the lifetime of their session and are 2445 * destroyed in the session put function 2446 */ 2447 if (tcon == NULL || tcon->ipc) 2448 return; 2449 2450 ses = tcon->ses; 2451 cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count); 2452 spin_lock(&cifs_tcp_ses_lock); 2453 spin_lock(&tcon->tc_lock); 2454 if (--tcon->tc_count > 0) { 2455 spin_unlock(&tcon->tc_lock); 2456 spin_unlock(&cifs_tcp_ses_lock); 2457 return; 2458 } 2459 2460 /* tc_count can never go negative */ 2461 WARN_ON(tcon->tc_count < 0); 2462 2463 list_del_init(&tcon->tcon_list); 2464 tcon->status = TID_EXITING; 2465 spin_unlock(&tcon->tc_lock); 2466 spin_unlock(&cifs_tcp_ses_lock); 2467 2468 /* cancel polling of interfaces */ 2469 cancel_delayed_work_sync(&tcon->query_interfaces); 2470 #ifdef CONFIG_CIFS_DFS_UPCALL 2471 cancel_delayed_work_sync(&tcon->dfs_cache_work); 2472 #endif 2473 2474 if (tcon->use_witness) { 2475 int rc; 2476 2477 rc = cifs_swn_unregister(tcon); 2478 if (rc < 0) { 2479 cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n", 2480 __func__, rc); 2481 } 2482 } 2483 2484 xid = get_xid(); 2485 if (ses->server->ops->tree_disconnect) 2486 ses->server->ops->tree_disconnect(xid, tcon); 2487 _free_xid(xid); 2488 2489 cifs_fscache_release_super_cookie(tcon); 2490 tconInfoFree(tcon); 2491 cifs_put_smb_ses(ses); 2492 } 2493 2494 /** 2495 * cifs_get_tcon - get a tcon matching @ctx data from @ses 2496 * @ses: smb session to issue the request on 2497 * @ctx: the superblock configuration context to use for building the 2498 * 2499 * - tcon refcount is the number of mount points using the tcon. 2500 * - ses refcount is the number of tcon using the session. 2501 * 2502 * 1. This function assumes it is being called from cifs_mount() where 2503 * we already got a session reference (ses refcount +1). 2504 * 2505 * 2. Since we're in the context of adding a mount point, the end 2506 * result should be either: 2507 * 2508 * a) a new tcon already allocated with refcount=1 (1 mount point) and 2509 * its session refcount incremented (1 new tcon). This +1 was 2510 * already done in (1). 2511 * 2512 * b) an existing tcon with refcount+1 (add a mount point to it) and 2513 * identical ses refcount (no new tcon). Because of (1) we need to 2514 * decrement the ses refcount. 2515 */ 2516 static struct cifs_tcon * 2517 cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx) 2518 { 2519 struct cifs_tcon *tcon; 2520 bool nohandlecache; 2521 int rc, xid; 2522 2523 tcon = cifs_find_tcon(ses, ctx); 2524 if (tcon) { 2525 /* 2526 * tcon has refcount already incremented but we need to 2527 * decrement extra ses reference gotten by caller (case b) 2528 */ 2529 cifs_dbg(FYI, "Found match on UNC path\n"); 2530 cifs_put_smb_ses(ses); 2531 return tcon; 2532 } 2533 2534 if (!ses->server->ops->tree_connect) { 2535 rc = -ENOSYS; 2536 goto out_fail; 2537 } 2538 2539 if (ses->server->dialect >= SMB20_PROT_ID && 2540 (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)) 2541 nohandlecache = ctx->nohandlecache; 2542 else 2543 nohandlecache = true; 2544 tcon = tcon_info_alloc(!nohandlecache); 2545 if (tcon == NULL) { 2546 rc = -ENOMEM; 2547 goto out_fail; 2548 } 2549 tcon->nohandlecache = nohandlecache; 2550 2551 if (ctx->snapshot_time) { 2552 if (ses->server->vals->protocol_id == 0) { 2553 cifs_dbg(VFS, 2554 "Use SMB2 or later for snapshot mount option\n"); 2555 rc = -EOPNOTSUPP; 2556 goto out_fail; 2557 } else 2558 tcon->snapshot_time = ctx->snapshot_time; 2559 } 2560 2561 if (ctx->handle_timeout) { 2562 if (ses->server->vals->protocol_id == 0) { 2563 cifs_dbg(VFS, 2564 "Use SMB2.1 or later for handle timeout option\n"); 2565 rc = -EOPNOTSUPP; 2566 goto out_fail; 2567 } else 2568 tcon->handle_timeout = ctx->handle_timeout; 2569 } 2570 2571 tcon->ses = ses; 2572 if (ctx->password) { 2573 tcon->password = kstrdup(ctx->password, GFP_KERNEL); 2574 if (!tcon->password) { 2575 rc = -ENOMEM; 2576 goto out_fail; 2577 } 2578 } 2579 2580 if (ctx->seal) { 2581 if (ses->server->vals->protocol_id == 0) { 2582 cifs_dbg(VFS, 2583 "SMB3 or later required for encryption\n"); 2584 rc = -EOPNOTSUPP; 2585 goto out_fail; 2586 } else if (tcon->ses->server->capabilities & 2587 SMB2_GLOBAL_CAP_ENCRYPTION) 2588 tcon->seal = true; 2589 else { 2590 cifs_dbg(VFS, "Encryption is not supported on share\n"); 2591 rc = -EOPNOTSUPP; 2592 goto out_fail; 2593 } 2594 } 2595 2596 if (ctx->linux_ext) { 2597 if (ses->server->posix_ext_supported) { 2598 tcon->posix_extensions = true; 2599 pr_warn_once("SMB3.11 POSIX Extensions are experimental\n"); 2600 } else if ((ses->server->vals->protocol_id == SMB311_PROT_ID) || 2601 (strcmp(ses->server->vals->version_string, 2602 SMB3ANY_VERSION_STRING) == 0) || 2603 (strcmp(ses->server->vals->version_string, 2604 SMBDEFAULT_VERSION_STRING) == 0)) { 2605 cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n"); 2606 rc = -EOPNOTSUPP; 2607 goto out_fail; 2608 } else { 2609 cifs_dbg(VFS, "Check vers= mount option. SMB3.11 " 2610 "disabled but required for POSIX extensions\n"); 2611 rc = -EOPNOTSUPP; 2612 goto out_fail; 2613 } 2614 } 2615 2616 xid = get_xid(); 2617 rc = ses->server->ops->tree_connect(xid, ses, ctx->UNC, tcon, 2618 ctx->local_nls); 2619 free_xid(xid); 2620 cifs_dbg(FYI, "Tcon rc = %d\n", rc); 2621 if (rc) 2622 goto out_fail; 2623 2624 tcon->use_persistent = false; 2625 /* check if SMB2 or later, CIFS does not support persistent handles */ 2626 if (ctx->persistent) { 2627 if (ses->server->vals->protocol_id == 0) { 2628 cifs_dbg(VFS, 2629 "SMB3 or later required for persistent handles\n"); 2630 rc = -EOPNOTSUPP; 2631 goto out_fail; 2632 } else if (ses->server->capabilities & 2633 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) 2634 tcon->use_persistent = true; 2635 else /* persistent handles requested but not supported */ { 2636 cifs_dbg(VFS, 2637 "Persistent handles not supported on share\n"); 2638 rc = -EOPNOTSUPP; 2639 goto out_fail; 2640 } 2641 } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY) 2642 && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) 2643 && (ctx->nopersistent == false)) { 2644 cifs_dbg(FYI, "enabling persistent handles\n"); 2645 tcon->use_persistent = true; 2646 } else if (ctx->resilient) { 2647 if (ses->server->vals->protocol_id == 0) { 2648 cifs_dbg(VFS, 2649 "SMB2.1 or later required for resilient handles\n"); 2650 rc = -EOPNOTSUPP; 2651 goto out_fail; 2652 } 2653 tcon->use_resilient = true; 2654 } 2655 2656 tcon->use_witness = false; 2657 if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL) && ctx->witness) { 2658 if (ses->server->vals->protocol_id >= SMB30_PROT_ID) { 2659 if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) { 2660 /* 2661 * Set witness in use flag in first place 2662 * to retry registration in the echo task 2663 */ 2664 tcon->use_witness = true; 2665 /* And try to register immediately */ 2666 rc = cifs_swn_register(tcon); 2667 if (rc < 0) { 2668 cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc); 2669 goto out_fail; 2670 } 2671 } else { 2672 /* TODO: try to extend for non-cluster uses (eg multichannel) */ 2673 cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n"); 2674 rc = -EOPNOTSUPP; 2675 goto out_fail; 2676 } 2677 } else { 2678 cifs_dbg(VFS, "SMB3 or later required for witness option\n"); 2679 rc = -EOPNOTSUPP; 2680 goto out_fail; 2681 } 2682 } 2683 2684 /* If the user really knows what they are doing they can override */ 2685 if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) { 2686 if (ctx->cache_ro) 2687 cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n"); 2688 else if (ctx->cache_rw) 2689 cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n"); 2690 } 2691 2692 if (ctx->no_lease) { 2693 if (ses->server->vals->protocol_id == 0) { 2694 cifs_dbg(VFS, 2695 "SMB2 or later required for nolease option\n"); 2696 rc = -EOPNOTSUPP; 2697 goto out_fail; 2698 } else 2699 tcon->no_lease = ctx->no_lease; 2700 } 2701 2702 /* 2703 * We can have only one retry value for a connection to a share so for 2704 * resources mounted more than once to the same server share the last 2705 * value passed in for the retry flag is used. 2706 */ 2707 tcon->retry = ctx->retry; 2708 tcon->nocase = ctx->nocase; 2709 tcon->broken_sparse_sup = ctx->no_sparse; 2710 tcon->max_cached_dirs = ctx->max_cached_dirs; 2711 tcon->nodelete = ctx->nodelete; 2712 tcon->local_lease = ctx->local_lease; 2713 INIT_LIST_HEAD(&tcon->pending_opens); 2714 tcon->status = TID_GOOD; 2715 2716 INIT_DELAYED_WORK(&tcon->query_interfaces, 2717 smb2_query_server_interfaces); 2718 if (ses->server->dialect >= SMB30_PROT_ID && 2719 (ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) { 2720 /* schedule query interfaces poll */ 2721 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces, 2722 (SMB_INTERFACE_POLL_INTERVAL * HZ)); 2723 } 2724 #ifdef CONFIG_CIFS_DFS_UPCALL 2725 INIT_DELAYED_WORK(&tcon->dfs_cache_work, dfs_cache_refresh); 2726 #endif 2727 spin_lock(&cifs_tcp_ses_lock); 2728 list_add(&tcon->tcon_list, &ses->tcon_list); 2729 spin_unlock(&cifs_tcp_ses_lock); 2730 2731 return tcon; 2732 2733 out_fail: 2734 tconInfoFree(tcon); 2735 return ERR_PTR(rc); 2736 } 2737 2738 void 2739 cifs_put_tlink(struct tcon_link *tlink) 2740 { 2741 if (!tlink || IS_ERR(tlink)) 2742 return; 2743 2744 if (!atomic_dec_and_test(&tlink->tl_count) || 2745 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) { 2746 tlink->tl_time = jiffies; 2747 return; 2748 } 2749 2750 if (!IS_ERR(tlink_tcon(tlink))) 2751 cifs_put_tcon(tlink_tcon(tlink)); 2752 kfree(tlink); 2753 return; 2754 } 2755 2756 static int 2757 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data) 2758 { 2759 struct cifs_sb_info *old = CIFS_SB(sb); 2760 struct cifs_sb_info *new = mnt_data->cifs_sb; 2761 unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK; 2762 unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK; 2763 2764 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK)) 2765 return 0; 2766 2767 if (old->mnt_cifs_serverino_autodisabled) 2768 newflags &= ~CIFS_MOUNT_SERVER_INUM; 2769 2770 if (oldflags != newflags) 2771 return 0; 2772 2773 /* 2774 * We want to share sb only if we don't specify an r/wsize or 2775 * specified r/wsize is greater than or equal to existing one. 2776 */ 2777 if (new->ctx->wsize && new->ctx->wsize < old->ctx->wsize) 2778 return 0; 2779 2780 if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize) 2781 return 0; 2782 2783 if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) || 2784 !gid_eq(old->ctx->linux_gid, new->ctx->linux_gid)) 2785 return 0; 2786 2787 if (old->ctx->file_mode != new->ctx->file_mode || 2788 old->ctx->dir_mode != new->ctx->dir_mode) 2789 return 0; 2790 2791 if (strcmp(old->local_nls->charset, new->local_nls->charset)) 2792 return 0; 2793 2794 if (old->ctx->acregmax != new->ctx->acregmax) 2795 return 0; 2796 if (old->ctx->acdirmax != new->ctx->acdirmax) 2797 return 0; 2798 if (old->ctx->closetimeo != new->ctx->closetimeo) 2799 return 0; 2800 2801 return 1; 2802 } 2803 2804 static int match_prepath(struct super_block *sb, 2805 struct cifs_tcon *tcon, 2806 struct cifs_mnt_data *mnt_data) 2807 { 2808 struct smb3_fs_context *ctx = mnt_data->ctx; 2809 struct cifs_sb_info *old = CIFS_SB(sb); 2810 struct cifs_sb_info *new = mnt_data->cifs_sb; 2811 bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) && 2812 old->prepath; 2813 bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) && 2814 new->prepath; 2815 2816 if (tcon->origin_fullpath && 2817 dfs_src_pathname_equal(tcon->origin_fullpath, ctx->source)) 2818 return 1; 2819 2820 if (old_set && new_set && !strcmp(new->prepath, old->prepath)) 2821 return 1; 2822 else if (!old_set && !new_set) 2823 return 1; 2824 2825 return 0; 2826 } 2827 2828 int 2829 cifs_match_super(struct super_block *sb, void *data) 2830 { 2831 struct cifs_mnt_data *mnt_data = data; 2832 struct smb3_fs_context *ctx; 2833 struct cifs_sb_info *cifs_sb; 2834 struct TCP_Server_Info *tcp_srv; 2835 struct cifs_ses *ses; 2836 struct cifs_tcon *tcon; 2837 struct tcon_link *tlink; 2838 int rc = 0; 2839 2840 spin_lock(&cifs_tcp_ses_lock); 2841 cifs_sb = CIFS_SB(sb); 2842 2843 /* We do not want to use a superblock that has been shutdown */ 2844 if (CIFS_MOUNT_SHUTDOWN & cifs_sb->mnt_cifs_flags) { 2845 spin_unlock(&cifs_tcp_ses_lock); 2846 return 0; 2847 } 2848 2849 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb)); 2850 if (IS_ERR_OR_NULL(tlink)) { 2851 pr_warn_once("%s: skip super matching due to bad tlink(%p)\n", 2852 __func__, tlink); 2853 spin_unlock(&cifs_tcp_ses_lock); 2854 return 0; 2855 } 2856 tcon = tlink_tcon(tlink); 2857 ses = tcon->ses; 2858 tcp_srv = ses->server; 2859 2860 ctx = mnt_data->ctx; 2861 2862 spin_lock(&tcp_srv->srv_lock); 2863 spin_lock(&ses->ses_lock); 2864 spin_lock(&ses->chan_lock); 2865 spin_lock(&tcon->tc_lock); 2866 if (!match_server(tcp_srv, ctx, true) || 2867 !match_session(ses, ctx) || 2868 !match_tcon(tcon, ctx) || 2869 !match_prepath(sb, tcon, mnt_data)) { 2870 rc = 0; 2871 goto out; 2872 } 2873 2874 rc = compare_mount_options(sb, mnt_data); 2875 out: 2876 spin_unlock(&tcon->tc_lock); 2877 spin_unlock(&ses->chan_lock); 2878 spin_unlock(&ses->ses_lock); 2879 spin_unlock(&tcp_srv->srv_lock); 2880 2881 spin_unlock(&cifs_tcp_ses_lock); 2882 cifs_put_tlink(tlink); 2883 return rc; 2884 } 2885 2886 #ifdef CONFIG_DEBUG_LOCK_ALLOC 2887 static struct lock_class_key cifs_key[2]; 2888 static struct lock_class_key cifs_slock_key[2]; 2889 2890 static inline void 2891 cifs_reclassify_socket4(struct socket *sock) 2892 { 2893 struct sock *sk = sock->sk; 2894 BUG_ON(!sock_allow_reclassification(sk)); 2895 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS", 2896 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]); 2897 } 2898 2899 static inline void 2900 cifs_reclassify_socket6(struct socket *sock) 2901 { 2902 struct sock *sk = sock->sk; 2903 BUG_ON(!sock_allow_reclassification(sk)); 2904 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS", 2905 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]); 2906 } 2907 #else 2908 static inline void 2909 cifs_reclassify_socket4(struct socket *sock) 2910 { 2911 } 2912 2913 static inline void 2914 cifs_reclassify_socket6(struct socket *sock) 2915 { 2916 } 2917 #endif 2918 2919 /* See RFC1001 section 14 on representation of Netbios names */ 2920 static void rfc1002mangle(char *target, char *source, unsigned int length) 2921 { 2922 unsigned int i, j; 2923 2924 for (i = 0, j = 0; i < (length); i++) { 2925 /* mask a nibble at a time and encode */ 2926 target[j] = 'A' + (0x0F & (source[i] >> 4)); 2927 target[j+1] = 'A' + (0x0F & source[i]); 2928 j += 2; 2929 } 2930 2931 } 2932 2933 static int 2934 bind_socket(struct TCP_Server_Info *server) 2935 { 2936 int rc = 0; 2937 if (server->srcaddr.ss_family != AF_UNSPEC) { 2938 /* Bind to the specified local IP address */ 2939 struct socket *socket = server->ssocket; 2940 rc = kernel_bind(socket, 2941 (struct sockaddr *) &server->srcaddr, 2942 sizeof(server->srcaddr)); 2943 if (rc < 0) { 2944 struct sockaddr_in *saddr4; 2945 struct sockaddr_in6 *saddr6; 2946 saddr4 = (struct sockaddr_in *)&server->srcaddr; 2947 saddr6 = (struct sockaddr_in6 *)&server->srcaddr; 2948 if (saddr6->sin6_family == AF_INET6) 2949 cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n", 2950 &saddr6->sin6_addr, rc); 2951 else 2952 cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n", 2953 &saddr4->sin_addr.s_addr, rc); 2954 } 2955 } 2956 return rc; 2957 } 2958 2959 static int 2960 ip_rfc1001_connect(struct TCP_Server_Info *server) 2961 { 2962 int rc = 0; 2963 /* 2964 * some servers require RFC1001 sessinit before sending 2965 * negprot - BB check reconnection in case where second 2966 * sessinit is sent but no second negprot 2967 */ 2968 struct rfc1002_session_packet req = {}; 2969 struct smb_hdr *smb_buf = (struct smb_hdr *)&req; 2970 unsigned int len; 2971 2972 req.trailer.session_req.called_len = sizeof(req.trailer.session_req.called_name); 2973 2974 if (server->server_RFC1001_name[0] != 0) 2975 rfc1002mangle(req.trailer.session_req.called_name, 2976 server->server_RFC1001_name, 2977 RFC1001_NAME_LEN_WITH_NULL); 2978 else 2979 rfc1002mangle(req.trailer.session_req.called_name, 2980 DEFAULT_CIFS_CALLED_NAME, 2981 RFC1001_NAME_LEN_WITH_NULL); 2982 2983 req.trailer.session_req.calling_len = sizeof(req.trailer.session_req.calling_name); 2984 2985 /* calling name ends in null (byte 16) from old smb convention */ 2986 if (server->workstation_RFC1001_name[0] != 0) 2987 rfc1002mangle(req.trailer.session_req.calling_name, 2988 server->workstation_RFC1001_name, 2989 RFC1001_NAME_LEN_WITH_NULL); 2990 else 2991 rfc1002mangle(req.trailer.session_req.calling_name, 2992 "LINUX_CIFS_CLNT", 2993 RFC1001_NAME_LEN_WITH_NULL); 2994 2995 /* 2996 * As per rfc1002, @len must be the number of bytes that follows the 2997 * length field of a rfc1002 session request payload. 2998 */ 2999 len = sizeof(req) - offsetof(struct rfc1002_session_packet, trailer.session_req); 3000 3001 smb_buf->smb_buf_length = cpu_to_be32((RFC1002_SESSION_REQUEST << 24) | len); 3002 rc = smb_send(server, smb_buf, len); 3003 /* 3004 * RFC1001 layer in at least one server requires very short break before 3005 * negprot presumably because not expecting negprot to follow so fast. 3006 * This is a simple solution that works without complicating the code 3007 * and causes no significant slowing down on mount for everyone else 3008 */ 3009 usleep_range(1000, 2000); 3010 3011 return rc; 3012 } 3013 3014 static int 3015 generic_ip_connect(struct TCP_Server_Info *server) 3016 { 3017 struct sockaddr *saddr; 3018 struct socket *socket; 3019 int slen, sfamily; 3020 __be16 sport; 3021 int rc = 0; 3022 3023 saddr = (struct sockaddr *) &server->dstaddr; 3024 3025 if (server->dstaddr.ss_family == AF_INET6) { 3026 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr; 3027 3028 sport = ipv6->sin6_port; 3029 slen = sizeof(struct sockaddr_in6); 3030 sfamily = AF_INET6; 3031 cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr, 3032 ntohs(sport)); 3033 } else { 3034 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr; 3035 3036 sport = ipv4->sin_port; 3037 slen = sizeof(struct sockaddr_in); 3038 sfamily = AF_INET; 3039 cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr, 3040 ntohs(sport)); 3041 } 3042 3043 if (server->ssocket) { 3044 socket = server->ssocket; 3045 } else { 3046 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM, 3047 IPPROTO_TCP, &server->ssocket, 1); 3048 if (rc < 0) { 3049 cifs_server_dbg(VFS, "Error %d creating socket\n", rc); 3050 return rc; 3051 } 3052 3053 /* BB other socket options to set KEEPALIVE, NODELAY? */ 3054 cifs_dbg(FYI, "Socket created\n"); 3055 socket = server->ssocket; 3056 socket->sk->sk_allocation = GFP_NOFS; 3057 socket->sk->sk_use_task_frag = false; 3058 if (sfamily == AF_INET6) 3059 cifs_reclassify_socket6(socket); 3060 else 3061 cifs_reclassify_socket4(socket); 3062 } 3063 3064 rc = bind_socket(server); 3065 if (rc < 0) 3066 return rc; 3067 3068 /* 3069 * Eventually check for other socket options to change from 3070 * the default. sock_setsockopt not used because it expects 3071 * user space buffer 3072 */ 3073 socket->sk->sk_rcvtimeo = 7 * HZ; 3074 socket->sk->sk_sndtimeo = 5 * HZ; 3075 3076 /* make the bufsizes depend on wsize/rsize and max requests */ 3077 if (server->noautotune) { 3078 if (socket->sk->sk_sndbuf < (200 * 1024)) 3079 socket->sk->sk_sndbuf = 200 * 1024; 3080 if (socket->sk->sk_rcvbuf < (140 * 1024)) 3081 socket->sk->sk_rcvbuf = 140 * 1024; 3082 } 3083 3084 if (server->tcp_nodelay) 3085 tcp_sock_set_nodelay(socket->sk); 3086 3087 cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n", 3088 socket->sk->sk_sndbuf, 3089 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo); 3090 3091 rc = kernel_connect(socket, saddr, slen, 3092 server->noblockcnt ? O_NONBLOCK : 0); 3093 /* 3094 * When mounting SMB root file systems, we do not want to block in 3095 * connect. Otherwise bail out and then let cifs_reconnect() perform 3096 * reconnect failover - if possible. 3097 */ 3098 if (server->noblockcnt && rc == -EINPROGRESS) 3099 rc = 0; 3100 if (rc < 0) { 3101 cifs_dbg(FYI, "Error %d connecting to server\n", rc); 3102 trace_smb3_connect_err(server->hostname, server->conn_id, &server->dstaddr, rc); 3103 sock_release(socket); 3104 server->ssocket = NULL; 3105 return rc; 3106 } 3107 trace_smb3_connect_done(server->hostname, server->conn_id, &server->dstaddr); 3108 if (sport == htons(RFC1001_PORT)) 3109 rc = ip_rfc1001_connect(server); 3110 3111 return rc; 3112 } 3113 3114 static int 3115 ip_connect(struct TCP_Server_Info *server) 3116 { 3117 __be16 *sport; 3118 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr; 3119 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr; 3120 3121 if (server->dstaddr.ss_family == AF_INET6) 3122 sport = &addr6->sin6_port; 3123 else 3124 sport = &addr->sin_port; 3125 3126 if (*sport == 0) { 3127 int rc; 3128 3129 /* try with 445 port at first */ 3130 *sport = htons(CIFS_PORT); 3131 3132 rc = generic_ip_connect(server); 3133 if (rc >= 0) 3134 return rc; 3135 3136 /* if it failed, try with 139 port */ 3137 *sport = htons(RFC1001_PORT); 3138 } 3139 3140 return generic_ip_connect(server); 3141 } 3142 3143 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 3144 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon, 3145 struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) 3146 { 3147 /* 3148 * If we are reconnecting then should we check to see if 3149 * any requested capabilities changed locally e.g. via 3150 * remount but we can not do much about it here 3151 * if they have (even if we could detect it by the following) 3152 * Perhaps we could add a backpointer to array of sb from tcon 3153 * or if we change to make all sb to same share the same 3154 * sb as NFS - then we only have one backpointer to sb. 3155 * What if we wanted to mount the server share twice once with 3156 * and once without posixacls or posix paths? 3157 */ 3158 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); 3159 3160 if (ctx && ctx->no_linux_ext) { 3161 tcon->fsUnixInfo.Capability = 0; 3162 tcon->unix_ext = 0; /* Unix Extensions disabled */ 3163 cifs_dbg(FYI, "Linux protocol extensions disabled\n"); 3164 return; 3165 } else if (ctx) 3166 tcon->unix_ext = 1; /* Unix Extensions supported */ 3167 3168 if (!tcon->unix_ext) { 3169 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n"); 3170 return; 3171 } 3172 3173 if (!CIFSSMBQFSUnixInfo(xid, tcon)) { 3174 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability); 3175 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap); 3176 /* 3177 * check for reconnect case in which we do not 3178 * want to change the mount behavior if we can avoid it 3179 */ 3180 if (ctx == NULL) { 3181 /* 3182 * turn off POSIX ACL and PATHNAMES if not set 3183 * originally at mount time 3184 */ 3185 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0) 3186 cap &= ~CIFS_UNIX_POSIX_ACL_CAP; 3187 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) { 3188 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) 3189 cifs_dbg(VFS, "POSIXPATH support change\n"); 3190 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP; 3191 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) { 3192 cifs_dbg(VFS, "possible reconnect error\n"); 3193 cifs_dbg(VFS, "server disabled POSIX path support\n"); 3194 } 3195 } 3196 3197 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP) 3198 cifs_dbg(VFS, "per-share encryption not supported yet\n"); 3199 3200 cap &= CIFS_UNIX_CAP_MASK; 3201 if (ctx && ctx->no_psx_acl) 3202 cap &= ~CIFS_UNIX_POSIX_ACL_CAP; 3203 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) { 3204 cifs_dbg(FYI, "negotiated posix acl support\n"); 3205 if (cifs_sb) 3206 cifs_sb->mnt_cifs_flags |= 3207 CIFS_MOUNT_POSIXACL; 3208 } 3209 3210 if (ctx && ctx->posix_paths == 0) 3211 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP; 3212 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) { 3213 cifs_dbg(FYI, "negotiate posix pathnames\n"); 3214 if (cifs_sb) 3215 cifs_sb->mnt_cifs_flags |= 3216 CIFS_MOUNT_POSIX_PATHS; 3217 } 3218 3219 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap); 3220 #ifdef CONFIG_CIFS_DEBUG2 3221 if (cap & CIFS_UNIX_FCNTL_CAP) 3222 cifs_dbg(FYI, "FCNTL cap\n"); 3223 if (cap & CIFS_UNIX_EXTATTR_CAP) 3224 cifs_dbg(FYI, "EXTATTR cap\n"); 3225 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) 3226 cifs_dbg(FYI, "POSIX path cap\n"); 3227 if (cap & CIFS_UNIX_XATTR_CAP) 3228 cifs_dbg(FYI, "XATTR cap\n"); 3229 if (cap & CIFS_UNIX_POSIX_ACL_CAP) 3230 cifs_dbg(FYI, "POSIX ACL cap\n"); 3231 if (cap & CIFS_UNIX_LARGE_READ_CAP) 3232 cifs_dbg(FYI, "very large read cap\n"); 3233 if (cap & CIFS_UNIX_LARGE_WRITE_CAP) 3234 cifs_dbg(FYI, "very large write cap\n"); 3235 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP) 3236 cifs_dbg(FYI, "transport encryption cap\n"); 3237 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP) 3238 cifs_dbg(FYI, "mandatory transport encryption cap\n"); 3239 #endif /* CIFS_DEBUG2 */ 3240 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) { 3241 if (ctx == NULL) 3242 cifs_dbg(FYI, "resetting capabilities failed\n"); 3243 else 3244 cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n"); 3245 3246 } 3247 } 3248 } 3249 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 3250 3251 int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb) 3252 { 3253 struct smb3_fs_context *ctx = cifs_sb->ctx; 3254 3255 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks); 3256 3257 spin_lock_init(&cifs_sb->tlink_tree_lock); 3258 cifs_sb->tlink_tree = RB_ROOT; 3259 3260 cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n", 3261 ctx->file_mode, ctx->dir_mode); 3262 3263 /* this is needed for ASCII cp to Unicode converts */ 3264 if (ctx->iocharset == NULL) { 3265 /* load_nls_default cannot return null */ 3266 cifs_sb->local_nls = load_nls_default(); 3267 } else { 3268 cifs_sb->local_nls = load_nls(ctx->iocharset); 3269 if (cifs_sb->local_nls == NULL) { 3270 cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n", 3271 ctx->iocharset); 3272 return -ELIBACC; 3273 } 3274 } 3275 ctx->local_nls = cifs_sb->local_nls; 3276 3277 smb3_update_mnt_flags(cifs_sb); 3278 3279 if (ctx->direct_io) 3280 cifs_dbg(FYI, "mounting share using direct i/o\n"); 3281 if (ctx->cache_ro) { 3282 cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n"); 3283 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE; 3284 } else if (ctx->cache_rw) { 3285 cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n"); 3286 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE | 3287 CIFS_MOUNT_RW_CACHE); 3288 } 3289 3290 if ((ctx->cifs_acl) && (ctx->dynperm)) 3291 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n"); 3292 3293 if (ctx->prepath) { 3294 cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL); 3295 if (cifs_sb->prepath == NULL) 3296 return -ENOMEM; 3297 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; 3298 } 3299 3300 return 0; 3301 } 3302 3303 /* Release all succeed connections */ 3304 void cifs_mount_put_conns(struct cifs_mount_ctx *mnt_ctx) 3305 { 3306 int rc = 0; 3307 3308 if (mnt_ctx->tcon) 3309 cifs_put_tcon(mnt_ctx->tcon); 3310 else if (mnt_ctx->ses) 3311 cifs_put_smb_ses(mnt_ctx->ses); 3312 else if (mnt_ctx->server) 3313 cifs_put_tcp_session(mnt_ctx->server, 0); 3314 mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS; 3315 free_xid(mnt_ctx->xid); 3316 } 3317 3318 int cifs_mount_get_session(struct cifs_mount_ctx *mnt_ctx) 3319 { 3320 struct TCP_Server_Info *server = NULL; 3321 struct smb3_fs_context *ctx; 3322 struct cifs_ses *ses = NULL; 3323 unsigned int xid; 3324 int rc = 0; 3325 3326 xid = get_xid(); 3327 3328 if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->fs_ctx)) { 3329 rc = -EINVAL; 3330 goto out; 3331 } 3332 ctx = mnt_ctx->fs_ctx; 3333 3334 /* get a reference to a tcp session */ 3335 server = cifs_get_tcp_session(ctx, NULL); 3336 if (IS_ERR(server)) { 3337 rc = PTR_ERR(server); 3338 server = NULL; 3339 goto out; 3340 } 3341 3342 /* get a reference to a SMB session */ 3343 ses = cifs_get_smb_ses(server, ctx); 3344 if (IS_ERR(ses)) { 3345 rc = PTR_ERR(ses); 3346 ses = NULL; 3347 goto out; 3348 } 3349 3350 if ((ctx->persistent == true) && (!(ses->server->capabilities & 3351 SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) { 3352 cifs_server_dbg(VFS, "persistent handles not supported by server\n"); 3353 rc = -EOPNOTSUPP; 3354 } 3355 3356 out: 3357 mnt_ctx->xid = xid; 3358 mnt_ctx->server = server; 3359 mnt_ctx->ses = ses; 3360 mnt_ctx->tcon = NULL; 3361 3362 return rc; 3363 } 3364 3365 int cifs_mount_get_tcon(struct cifs_mount_ctx *mnt_ctx) 3366 { 3367 struct TCP_Server_Info *server; 3368 struct cifs_sb_info *cifs_sb; 3369 struct smb3_fs_context *ctx; 3370 struct cifs_tcon *tcon = NULL; 3371 int rc = 0; 3372 3373 if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->server || !mnt_ctx->ses || !mnt_ctx->fs_ctx || 3374 !mnt_ctx->cifs_sb)) { 3375 rc = -EINVAL; 3376 goto out; 3377 } 3378 server = mnt_ctx->server; 3379 ctx = mnt_ctx->fs_ctx; 3380 cifs_sb = mnt_ctx->cifs_sb; 3381 3382 /* search for existing tcon to this server share */ 3383 tcon = cifs_get_tcon(mnt_ctx->ses, ctx); 3384 if (IS_ERR(tcon)) { 3385 rc = PTR_ERR(tcon); 3386 tcon = NULL; 3387 goto out; 3388 } 3389 3390 /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */ 3391 if (tcon->posix_extensions) 3392 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS; 3393 3394 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 3395 /* tell server which Unix caps we support */ 3396 if (cap_unix(tcon->ses)) { 3397 /* 3398 * reset of caps checks mount to see if unix extensions disabled 3399 * for just this mount. 3400 */ 3401 reset_cifs_unix_caps(mnt_ctx->xid, tcon, cifs_sb, ctx); 3402 spin_lock(&tcon->ses->server->srv_lock); 3403 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) && 3404 (le64_to_cpu(tcon->fsUnixInfo.Capability) & 3405 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) { 3406 spin_unlock(&tcon->ses->server->srv_lock); 3407 rc = -EACCES; 3408 goto out; 3409 } 3410 spin_unlock(&tcon->ses->server->srv_lock); 3411 } else 3412 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 3413 tcon->unix_ext = 0; /* server does not support them */ 3414 3415 /* do not care if a following call succeed - informational */ 3416 if (!tcon->pipe && server->ops->qfs_tcon) { 3417 server->ops->qfs_tcon(mnt_ctx->xid, tcon, cifs_sb); 3418 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) { 3419 if (tcon->fsDevInfo.DeviceCharacteristics & 3420 cpu_to_le32(FILE_READ_ONLY_DEVICE)) 3421 cifs_dbg(VFS, "mounted to read only share\n"); 3422 else if ((cifs_sb->mnt_cifs_flags & 3423 CIFS_MOUNT_RW_CACHE) == 0) 3424 cifs_dbg(VFS, "read only mount of RW share\n"); 3425 /* no need to log a RW mount of a typical RW share */ 3426 } 3427 } 3428 3429 /* 3430 * Clamp the rsize/wsize mount arguments if they are too big for the server 3431 * and set the rsize/wsize to the negotiated values if not passed in by 3432 * the user on mount 3433 */ 3434 if ((cifs_sb->ctx->wsize == 0) || 3435 (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx))) { 3436 cifs_sb->ctx->wsize = 3437 round_down(server->ops->negotiate_wsize(tcon, ctx), PAGE_SIZE); 3438 /* 3439 * in the very unlikely event that the server sent a max write size under PAGE_SIZE, 3440 * (which would get rounded down to 0) then reset wsize to absolute minimum eg 4096 3441 */ 3442 if (cifs_sb->ctx->wsize == 0) { 3443 cifs_sb->ctx->wsize = PAGE_SIZE; 3444 cifs_dbg(VFS, "wsize too small, reset to minimum ie PAGE_SIZE, usually 4096\n"); 3445 } 3446 } 3447 if ((cifs_sb->ctx->rsize == 0) || 3448 (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx))) 3449 cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx); 3450 3451 /* 3452 * The cookie is initialized from volume info returned above. 3453 * Inside cifs_fscache_get_super_cookie it checks 3454 * that we do not get super cookie twice. 3455 */ 3456 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) 3457 cifs_fscache_get_super_cookie(tcon); 3458 3459 out: 3460 mnt_ctx->tcon = tcon; 3461 return rc; 3462 } 3463 3464 static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses, 3465 struct cifs_tcon *tcon) 3466 { 3467 struct tcon_link *tlink; 3468 3469 /* hang the tcon off of the superblock */ 3470 tlink = kzalloc(sizeof(*tlink), GFP_KERNEL); 3471 if (tlink == NULL) 3472 return -ENOMEM; 3473 3474 tlink->tl_uid = ses->linux_uid; 3475 tlink->tl_tcon = tcon; 3476 tlink->tl_time = jiffies; 3477 set_bit(TCON_LINK_MASTER, &tlink->tl_flags); 3478 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags); 3479 3480 cifs_sb->master_tlink = tlink; 3481 spin_lock(&cifs_sb->tlink_tree_lock); 3482 tlink_rb_insert(&cifs_sb->tlink_tree, tlink); 3483 spin_unlock(&cifs_sb->tlink_tree_lock); 3484 3485 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks, 3486 TLINK_IDLE_EXPIRE); 3487 return 0; 3488 } 3489 3490 static int 3491 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server, 3492 unsigned int xid, 3493 struct cifs_tcon *tcon, 3494 struct cifs_sb_info *cifs_sb, 3495 char *full_path, 3496 int added_treename) 3497 { 3498 int rc; 3499 char *s; 3500 char sep, tmp; 3501 int skip = added_treename ? 1 : 0; 3502 3503 sep = CIFS_DIR_SEP(cifs_sb); 3504 s = full_path; 3505 3506 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, ""); 3507 while (rc == 0) { 3508 /* skip separators */ 3509 while (*s == sep) 3510 s++; 3511 if (!*s) 3512 break; 3513 /* next separator */ 3514 while (*s && *s != sep) 3515 s++; 3516 /* 3517 * if the treename is added, we then have to skip the first 3518 * part within the separators 3519 */ 3520 if (skip) { 3521 skip = 0; 3522 continue; 3523 } 3524 /* 3525 * temporarily null-terminate the path at the end of 3526 * the current component 3527 */ 3528 tmp = *s; 3529 *s = 0; 3530 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, 3531 full_path); 3532 *s = tmp; 3533 } 3534 return rc; 3535 } 3536 3537 /* 3538 * Check if path is remote (i.e. a DFS share). 3539 * 3540 * Return -EREMOTE if it is, otherwise 0 or -errno. 3541 */ 3542 int cifs_is_path_remote(struct cifs_mount_ctx *mnt_ctx) 3543 { 3544 int rc; 3545 struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb; 3546 struct TCP_Server_Info *server = mnt_ctx->server; 3547 unsigned int xid = mnt_ctx->xid; 3548 struct cifs_tcon *tcon = mnt_ctx->tcon; 3549 struct smb3_fs_context *ctx = mnt_ctx->fs_ctx; 3550 char *full_path; 3551 3552 if (!server->ops->is_path_accessible) 3553 return -EOPNOTSUPP; 3554 3555 /* 3556 * cifs_build_path_to_root works only when we have a valid tcon 3557 */ 3558 full_path = cifs_build_path_to_root(ctx, cifs_sb, tcon, 3559 tcon->Flags & SMB_SHARE_IS_IN_DFS); 3560 if (full_path == NULL) 3561 return -ENOMEM; 3562 3563 cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path); 3564 3565 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, 3566 full_path); 3567 if (rc != 0 && rc != -EREMOTE) 3568 goto out; 3569 3570 if (rc != -EREMOTE) { 3571 rc = cifs_are_all_path_components_accessible(server, xid, tcon, 3572 cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS); 3573 if (rc != 0) { 3574 cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n"); 3575 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; 3576 rc = 0; 3577 } 3578 } 3579 3580 out: 3581 kfree(full_path); 3582 return rc; 3583 } 3584 3585 #ifdef CONFIG_CIFS_DFS_UPCALL 3586 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) 3587 { 3588 struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, }; 3589 bool isdfs; 3590 int rc; 3591 3592 INIT_LIST_HEAD(&mnt_ctx.dfs_ses_list); 3593 3594 rc = dfs_mount_share(&mnt_ctx, &isdfs); 3595 if (rc) 3596 goto error; 3597 if (!isdfs) 3598 goto out; 3599 3600 /* 3601 * After reconnecting to a different server, unique ids won't match anymore, so we disable 3602 * serverino. This prevents dentry revalidation to think the dentry are stale (ESTALE). 3603 */ 3604 cifs_autodisable_serverino(cifs_sb); 3605 /* 3606 * Force the use of prefix path to support failover on DFS paths that resolve to targets 3607 * that have different prefix paths. 3608 */ 3609 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; 3610 kfree(cifs_sb->prepath); 3611 cifs_sb->prepath = ctx->prepath; 3612 ctx->prepath = NULL; 3613 3614 out: 3615 cifs_try_adding_channels(mnt_ctx.ses); 3616 rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon); 3617 if (rc) 3618 goto error; 3619 3620 free_xid(mnt_ctx.xid); 3621 return rc; 3622 3623 error: 3624 dfs_put_root_smb_sessions(&mnt_ctx.dfs_ses_list); 3625 cifs_mount_put_conns(&mnt_ctx); 3626 return rc; 3627 } 3628 #else 3629 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) 3630 { 3631 int rc = 0; 3632 struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, }; 3633 3634 rc = cifs_mount_get_session(&mnt_ctx); 3635 if (rc) 3636 goto error; 3637 3638 rc = cifs_mount_get_tcon(&mnt_ctx); 3639 if (rc) 3640 goto error; 3641 3642 rc = cifs_is_path_remote(&mnt_ctx); 3643 if (rc == -EREMOTE) 3644 rc = -EOPNOTSUPP; 3645 if (rc) 3646 goto error; 3647 3648 rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon); 3649 if (rc) 3650 goto error; 3651 3652 free_xid(mnt_ctx.xid); 3653 return rc; 3654 3655 error: 3656 cifs_mount_put_conns(&mnt_ctx); 3657 return rc; 3658 } 3659 #endif 3660 3661 /* 3662 * Issue a TREE_CONNECT request. 3663 */ 3664 int 3665 CIFSTCon(const unsigned int xid, struct cifs_ses *ses, 3666 const char *tree, struct cifs_tcon *tcon, 3667 const struct nls_table *nls_codepage) 3668 { 3669 struct smb_hdr *smb_buffer; 3670 struct smb_hdr *smb_buffer_response; 3671 TCONX_REQ *pSMB; 3672 TCONX_RSP *pSMBr; 3673 unsigned char *bcc_ptr; 3674 int rc = 0; 3675 int length; 3676 __u16 bytes_left, count; 3677 3678 if (ses == NULL) 3679 return -EIO; 3680 3681 smb_buffer = cifs_buf_get(); 3682 if (smb_buffer == NULL) 3683 return -ENOMEM; 3684 3685 smb_buffer_response = smb_buffer; 3686 3687 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX, 3688 NULL /*no tid */ , 4 /*wct */ ); 3689 3690 smb_buffer->Mid = get_next_mid(ses->server); 3691 smb_buffer->Uid = ses->Suid; 3692 pSMB = (TCONX_REQ *) smb_buffer; 3693 pSMBr = (TCONX_RSP *) smb_buffer_response; 3694 3695 pSMB->AndXCommand = 0xFF; 3696 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO); 3697 bcc_ptr = &pSMB->Password[0]; 3698 3699 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */ 3700 *bcc_ptr = 0; /* password is null byte */ 3701 bcc_ptr++; /* skip password */ 3702 /* already aligned so no need to do it below */ 3703 3704 if (ses->server->sign) 3705 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; 3706 3707 if (ses->capabilities & CAP_STATUS32) { 3708 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS; 3709 } 3710 if (ses->capabilities & CAP_DFS) { 3711 smb_buffer->Flags2 |= SMBFLG2_DFS; 3712 } 3713 if (ses->capabilities & CAP_UNICODE) { 3714 smb_buffer->Flags2 |= SMBFLG2_UNICODE; 3715 length = 3716 cifs_strtoUTF16((__le16 *) bcc_ptr, tree, 3717 6 /* max utf8 char length in bytes */ * 3718 (/* server len*/ + 256 /* share len */), nls_codepage); 3719 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */ 3720 bcc_ptr += 2; /* skip trailing null */ 3721 } else { /* ASCII */ 3722 strcpy(bcc_ptr, tree); 3723 bcc_ptr += strlen(tree) + 1; 3724 } 3725 strcpy(bcc_ptr, "?????"); 3726 bcc_ptr += strlen("?????"); 3727 bcc_ptr += 1; 3728 count = bcc_ptr - &pSMB->Password[0]; 3729 be32_add_cpu(&pSMB->hdr.smb_buf_length, count); 3730 pSMB->ByteCount = cpu_to_le16(count); 3731 3732 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length, 3733 0); 3734 3735 /* above now done in SendReceive */ 3736 if (rc == 0) { 3737 bool is_unicode; 3738 3739 tcon->tid = smb_buffer_response->Tid; 3740 bcc_ptr = pByteArea(smb_buffer_response); 3741 bytes_left = get_bcc(smb_buffer_response); 3742 length = strnlen(bcc_ptr, bytes_left - 2); 3743 if (smb_buffer->Flags2 & SMBFLG2_UNICODE) 3744 is_unicode = true; 3745 else 3746 is_unicode = false; 3747 3748 3749 /* skip service field (NB: this field is always ASCII) */ 3750 if (length == 3) { 3751 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') && 3752 (bcc_ptr[2] == 'C')) { 3753 cifs_dbg(FYI, "IPC connection\n"); 3754 tcon->ipc = true; 3755 tcon->pipe = true; 3756 } 3757 } else if (length == 2) { 3758 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) { 3759 /* the most common case */ 3760 cifs_dbg(FYI, "disk share connection\n"); 3761 } 3762 } 3763 bcc_ptr += length + 1; 3764 bytes_left -= (length + 1); 3765 strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name)); 3766 3767 /* mostly informational -- no need to fail on error here */ 3768 kfree(tcon->nativeFileSystem); 3769 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr, 3770 bytes_left, is_unicode, 3771 nls_codepage); 3772 3773 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem); 3774 3775 if ((smb_buffer_response->WordCount == 3) || 3776 (smb_buffer_response->WordCount == 7)) 3777 /* field is in same location */ 3778 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport); 3779 else 3780 tcon->Flags = 0; 3781 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags); 3782 } 3783 3784 cifs_buf_release(smb_buffer); 3785 return rc; 3786 } 3787 3788 static void delayed_free(struct rcu_head *p) 3789 { 3790 struct cifs_sb_info *cifs_sb = container_of(p, struct cifs_sb_info, rcu); 3791 3792 unload_nls(cifs_sb->local_nls); 3793 smb3_cleanup_fs_context(cifs_sb->ctx); 3794 kfree(cifs_sb); 3795 } 3796 3797 void 3798 cifs_umount(struct cifs_sb_info *cifs_sb) 3799 { 3800 struct rb_root *root = &cifs_sb->tlink_tree; 3801 struct rb_node *node; 3802 struct tcon_link *tlink; 3803 3804 cancel_delayed_work_sync(&cifs_sb->prune_tlinks); 3805 3806 spin_lock(&cifs_sb->tlink_tree_lock); 3807 while ((node = rb_first(root))) { 3808 tlink = rb_entry(node, struct tcon_link, tl_rbnode); 3809 cifs_get_tlink(tlink); 3810 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags); 3811 rb_erase(node, root); 3812 3813 spin_unlock(&cifs_sb->tlink_tree_lock); 3814 cifs_put_tlink(tlink); 3815 spin_lock(&cifs_sb->tlink_tree_lock); 3816 } 3817 spin_unlock(&cifs_sb->tlink_tree_lock); 3818 3819 kfree(cifs_sb->prepath); 3820 call_rcu(&cifs_sb->rcu, delayed_free); 3821 } 3822 3823 int 3824 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses, 3825 struct TCP_Server_Info *server) 3826 { 3827 int rc = 0; 3828 3829 if (!server->ops->need_neg || !server->ops->negotiate) 3830 return -ENOSYS; 3831 3832 /* only send once per connect */ 3833 spin_lock(&server->srv_lock); 3834 if (server->tcpStatus != CifsGood && 3835 server->tcpStatus != CifsNew && 3836 server->tcpStatus != CifsNeedNegotiate) { 3837 spin_unlock(&server->srv_lock); 3838 return -EHOSTDOWN; 3839 } 3840 3841 if (!server->ops->need_neg(server) && 3842 server->tcpStatus == CifsGood) { 3843 spin_unlock(&server->srv_lock); 3844 return 0; 3845 } 3846 3847 server->tcpStatus = CifsInNegotiate; 3848 spin_unlock(&server->srv_lock); 3849 3850 rc = server->ops->negotiate(xid, ses, server); 3851 if (rc == 0) { 3852 spin_lock(&server->srv_lock); 3853 if (server->tcpStatus == CifsInNegotiate) 3854 server->tcpStatus = CifsGood; 3855 else 3856 rc = -EHOSTDOWN; 3857 spin_unlock(&server->srv_lock); 3858 } else { 3859 spin_lock(&server->srv_lock); 3860 if (server->tcpStatus == CifsInNegotiate) 3861 server->tcpStatus = CifsNeedNegotiate; 3862 spin_unlock(&server->srv_lock); 3863 } 3864 3865 return rc; 3866 } 3867 3868 int 3869 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses, 3870 struct TCP_Server_Info *server, 3871 struct nls_table *nls_info) 3872 { 3873 int rc = -ENOSYS; 3874 struct TCP_Server_Info *pserver = SERVER_IS_CHAN(server) ? server->primary_server : server; 3875 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&pserver->dstaddr; 3876 struct sockaddr_in *addr = (struct sockaddr_in *)&pserver->dstaddr; 3877 bool is_binding = false; 3878 3879 spin_lock(&ses->ses_lock); 3880 cifs_dbg(FYI, "%s: channel connect bitmap: 0x%lx\n", 3881 __func__, ses->chans_need_reconnect); 3882 3883 if (ses->ses_status != SES_GOOD && 3884 ses->ses_status != SES_NEW && 3885 ses->ses_status != SES_NEED_RECON) { 3886 spin_unlock(&ses->ses_lock); 3887 return -EHOSTDOWN; 3888 } 3889 3890 /* only send once per connect */ 3891 spin_lock(&ses->chan_lock); 3892 if (CIFS_ALL_CHANS_GOOD(ses)) { 3893 if (ses->ses_status == SES_NEED_RECON) 3894 ses->ses_status = SES_GOOD; 3895 spin_unlock(&ses->chan_lock); 3896 spin_unlock(&ses->ses_lock); 3897 return 0; 3898 } 3899 3900 cifs_chan_set_in_reconnect(ses, server); 3901 is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses); 3902 spin_unlock(&ses->chan_lock); 3903 3904 if (!is_binding) { 3905 ses->ses_status = SES_IN_SETUP; 3906 3907 /* force iface_list refresh */ 3908 ses->iface_last_update = 0; 3909 } 3910 spin_unlock(&ses->ses_lock); 3911 3912 /* update ses ip_addr only for primary chan */ 3913 if (server == pserver) { 3914 if (server->dstaddr.ss_family == AF_INET6) 3915 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr); 3916 else 3917 scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr); 3918 } 3919 3920 if (!is_binding) { 3921 ses->capabilities = server->capabilities; 3922 if (!linuxExtEnabled) 3923 ses->capabilities &= (~server->vals->cap_unix); 3924 3925 if (ses->auth_key.response) { 3926 cifs_dbg(FYI, "Free previous auth_key.response = %p\n", 3927 ses->auth_key.response); 3928 kfree_sensitive(ses->auth_key.response); 3929 ses->auth_key.response = NULL; 3930 ses->auth_key.len = 0; 3931 } 3932 } 3933 3934 cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n", 3935 server->sec_mode, server->capabilities, server->timeAdj); 3936 3937 if (server->ops->sess_setup) 3938 rc = server->ops->sess_setup(xid, ses, server, nls_info); 3939 3940 if (rc) { 3941 cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc); 3942 spin_lock(&ses->ses_lock); 3943 if (ses->ses_status == SES_IN_SETUP) 3944 ses->ses_status = SES_NEED_RECON; 3945 spin_lock(&ses->chan_lock); 3946 cifs_chan_clear_in_reconnect(ses, server); 3947 spin_unlock(&ses->chan_lock); 3948 spin_unlock(&ses->ses_lock); 3949 } else { 3950 spin_lock(&ses->ses_lock); 3951 if (ses->ses_status == SES_IN_SETUP) 3952 ses->ses_status = SES_GOOD; 3953 spin_lock(&ses->chan_lock); 3954 cifs_chan_clear_in_reconnect(ses, server); 3955 cifs_chan_clear_need_reconnect(ses, server); 3956 spin_unlock(&ses->chan_lock); 3957 spin_unlock(&ses->ses_lock); 3958 } 3959 3960 return rc; 3961 } 3962 3963 static int 3964 cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses) 3965 { 3966 ctx->sectype = ses->sectype; 3967 3968 /* krb5 is special, since we don't need username or pw */ 3969 if (ctx->sectype == Kerberos) 3970 return 0; 3971 3972 return cifs_set_cifscreds(ctx, ses); 3973 } 3974 3975 static struct cifs_tcon * 3976 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid) 3977 { 3978 int rc; 3979 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb); 3980 struct cifs_ses *ses; 3981 struct cifs_tcon *tcon = NULL; 3982 struct smb3_fs_context *ctx; 3983 3984 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); 3985 if (ctx == NULL) 3986 return ERR_PTR(-ENOMEM); 3987 3988 ctx->local_nls = cifs_sb->local_nls; 3989 ctx->linux_uid = fsuid; 3990 ctx->cred_uid = fsuid; 3991 ctx->UNC = master_tcon->tree_name; 3992 ctx->retry = master_tcon->retry; 3993 ctx->nocase = master_tcon->nocase; 3994 ctx->nohandlecache = master_tcon->nohandlecache; 3995 ctx->local_lease = master_tcon->local_lease; 3996 ctx->no_lease = master_tcon->no_lease; 3997 ctx->resilient = master_tcon->use_resilient; 3998 ctx->persistent = master_tcon->use_persistent; 3999 ctx->handle_timeout = master_tcon->handle_timeout; 4000 ctx->no_linux_ext = !master_tcon->unix_ext; 4001 ctx->linux_ext = master_tcon->posix_extensions; 4002 ctx->sectype = master_tcon->ses->sectype; 4003 ctx->sign = master_tcon->ses->sign; 4004 ctx->seal = master_tcon->seal; 4005 ctx->witness = master_tcon->use_witness; 4006 4007 rc = cifs_set_vol_auth(ctx, master_tcon->ses); 4008 if (rc) { 4009 tcon = ERR_PTR(rc); 4010 goto out; 4011 } 4012 4013 /* get a reference for the same TCP session */ 4014 spin_lock(&cifs_tcp_ses_lock); 4015 ++master_tcon->ses->server->srv_count; 4016 spin_unlock(&cifs_tcp_ses_lock); 4017 4018 ses = cifs_get_smb_ses(master_tcon->ses->server, ctx); 4019 if (IS_ERR(ses)) { 4020 tcon = (struct cifs_tcon *)ses; 4021 cifs_put_tcp_session(master_tcon->ses->server, 0); 4022 goto out; 4023 } 4024 4025 tcon = cifs_get_tcon(ses, ctx); 4026 if (IS_ERR(tcon)) { 4027 cifs_put_smb_ses(ses); 4028 goto out; 4029 } 4030 4031 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY 4032 if (cap_unix(ses)) 4033 reset_cifs_unix_caps(0, tcon, NULL, ctx); 4034 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ 4035 4036 out: 4037 kfree(ctx->username); 4038 kfree_sensitive(ctx->password); 4039 kfree(ctx); 4040 4041 return tcon; 4042 } 4043 4044 struct cifs_tcon * 4045 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb) 4046 { 4047 return tlink_tcon(cifs_sb_master_tlink(cifs_sb)); 4048 } 4049 4050 /* find and return a tlink with given uid */ 4051 static struct tcon_link * 4052 tlink_rb_search(struct rb_root *root, kuid_t uid) 4053 { 4054 struct rb_node *node = root->rb_node; 4055 struct tcon_link *tlink; 4056 4057 while (node) { 4058 tlink = rb_entry(node, struct tcon_link, tl_rbnode); 4059 4060 if (uid_gt(tlink->tl_uid, uid)) 4061 node = node->rb_left; 4062 else if (uid_lt(tlink->tl_uid, uid)) 4063 node = node->rb_right; 4064 else 4065 return tlink; 4066 } 4067 return NULL; 4068 } 4069 4070 /* insert a tcon_link into the tree */ 4071 static void 4072 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink) 4073 { 4074 struct rb_node **new = &(root->rb_node), *parent = NULL; 4075 struct tcon_link *tlink; 4076 4077 while (*new) { 4078 tlink = rb_entry(*new, struct tcon_link, tl_rbnode); 4079 parent = *new; 4080 4081 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid)) 4082 new = &((*new)->rb_left); 4083 else 4084 new = &((*new)->rb_right); 4085 } 4086 4087 rb_link_node(&new_tlink->tl_rbnode, parent, new); 4088 rb_insert_color(&new_tlink->tl_rbnode, root); 4089 } 4090 4091 /* 4092 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the 4093 * current task. 4094 * 4095 * If the superblock doesn't refer to a multiuser mount, then just return 4096 * the master tcon for the mount. 4097 * 4098 * First, search the rbtree for an existing tcon for this fsuid. If one 4099 * exists, then check to see if it's pending construction. If it is then wait 4100 * for construction to complete. Once it's no longer pending, check to see if 4101 * it failed and either return an error or retry construction, depending on 4102 * the timeout. 4103 * 4104 * If one doesn't exist then insert a new tcon_link struct into the tree and 4105 * try to construct a new one. 4106 */ 4107 struct tcon_link * 4108 cifs_sb_tlink(struct cifs_sb_info *cifs_sb) 4109 { 4110 int ret; 4111 kuid_t fsuid = current_fsuid(); 4112 struct tcon_link *tlink, *newtlink; 4113 4114 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) 4115 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb)); 4116 4117 spin_lock(&cifs_sb->tlink_tree_lock); 4118 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid); 4119 if (tlink) 4120 cifs_get_tlink(tlink); 4121 spin_unlock(&cifs_sb->tlink_tree_lock); 4122 4123 if (tlink == NULL) { 4124 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL); 4125 if (newtlink == NULL) 4126 return ERR_PTR(-ENOMEM); 4127 newtlink->tl_uid = fsuid; 4128 newtlink->tl_tcon = ERR_PTR(-EACCES); 4129 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags); 4130 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags); 4131 cifs_get_tlink(newtlink); 4132 4133 spin_lock(&cifs_sb->tlink_tree_lock); 4134 /* was one inserted after previous search? */ 4135 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid); 4136 if (tlink) { 4137 cifs_get_tlink(tlink); 4138 spin_unlock(&cifs_sb->tlink_tree_lock); 4139 kfree(newtlink); 4140 goto wait_for_construction; 4141 } 4142 tlink = newtlink; 4143 tlink_rb_insert(&cifs_sb->tlink_tree, tlink); 4144 spin_unlock(&cifs_sb->tlink_tree_lock); 4145 } else { 4146 wait_for_construction: 4147 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING, 4148 TASK_INTERRUPTIBLE); 4149 if (ret) { 4150 cifs_put_tlink(tlink); 4151 return ERR_PTR(-ERESTARTSYS); 4152 } 4153 4154 /* if it's good, return it */ 4155 if (!IS_ERR(tlink->tl_tcon)) 4156 return tlink; 4157 4158 /* return error if we tried this already recently */ 4159 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) { 4160 cifs_put_tlink(tlink); 4161 return ERR_PTR(-EACCES); 4162 } 4163 4164 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags)) 4165 goto wait_for_construction; 4166 } 4167 4168 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid); 4169 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags); 4170 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING); 4171 4172 if (IS_ERR(tlink->tl_tcon)) { 4173 cifs_put_tlink(tlink); 4174 return ERR_PTR(-EACCES); 4175 } 4176 4177 return tlink; 4178 } 4179 4180 /* 4181 * periodic workqueue job that scans tcon_tree for a superblock and closes 4182 * out tcons. 4183 */ 4184 static void 4185 cifs_prune_tlinks(struct work_struct *work) 4186 { 4187 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info, 4188 prune_tlinks.work); 4189 struct rb_root *root = &cifs_sb->tlink_tree; 4190 struct rb_node *node; 4191 struct rb_node *tmp; 4192 struct tcon_link *tlink; 4193 4194 /* 4195 * Because we drop the spinlock in the loop in order to put the tlink 4196 * it's not guarded against removal of links from the tree. The only 4197 * places that remove entries from the tree are this function and 4198 * umounts. Because this function is non-reentrant and is canceled 4199 * before umount can proceed, this is safe. 4200 */ 4201 spin_lock(&cifs_sb->tlink_tree_lock); 4202 node = rb_first(root); 4203 while (node != NULL) { 4204 tmp = node; 4205 node = rb_next(tmp); 4206 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode); 4207 4208 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) || 4209 atomic_read(&tlink->tl_count) != 0 || 4210 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies)) 4211 continue; 4212 4213 cifs_get_tlink(tlink); 4214 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags); 4215 rb_erase(tmp, root); 4216 4217 spin_unlock(&cifs_sb->tlink_tree_lock); 4218 cifs_put_tlink(tlink); 4219 spin_lock(&cifs_sb->tlink_tree_lock); 4220 } 4221 spin_unlock(&cifs_sb->tlink_tree_lock); 4222 4223 queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks, 4224 TLINK_IDLE_EXPIRE); 4225 } 4226 4227 #ifndef CONFIG_CIFS_DFS_UPCALL 4228 int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc) 4229 { 4230 int rc; 4231 const struct smb_version_operations *ops = tcon->ses->server->ops; 4232 4233 /* only send once per connect */ 4234 spin_lock(&tcon->tc_lock); 4235 4236 /* if tcon is marked for needing reconnect, update state */ 4237 if (tcon->need_reconnect) 4238 tcon->status = TID_NEED_TCON; 4239 4240 if (tcon->status == TID_GOOD) { 4241 spin_unlock(&tcon->tc_lock); 4242 return 0; 4243 } 4244 4245 if (tcon->status != TID_NEW && 4246 tcon->status != TID_NEED_TCON) { 4247 spin_unlock(&tcon->tc_lock); 4248 return -EHOSTDOWN; 4249 } 4250 4251 tcon->status = TID_IN_TCON; 4252 spin_unlock(&tcon->tc_lock); 4253 4254 rc = ops->tree_connect(xid, tcon->ses, tcon->tree_name, tcon, nlsc); 4255 if (rc) { 4256 spin_lock(&tcon->tc_lock); 4257 if (tcon->status == TID_IN_TCON) 4258 tcon->status = TID_NEED_TCON; 4259 spin_unlock(&tcon->tc_lock); 4260 } else { 4261 spin_lock(&tcon->tc_lock); 4262 if (tcon->status == TID_IN_TCON) 4263 tcon->status = TID_GOOD; 4264 tcon->need_reconnect = false; 4265 spin_unlock(&tcon->tc_lock); 4266 } 4267 4268 return rc; 4269 } 4270 #endif 4271