fs/smb/client/connect.c

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