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