fs/cifs/connect.c

   1 /*
   2  *   fs/cifs/connect.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2011
   5  *   Author(s): Steve French ([email protected])
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21 #include <linux/fs.h>
  22 #include <linux/net.h>
  23 #include <linux/string.h>
  24 #include <linux/sched/mm.h>
  25 #include <linux/sched/signal.h>
  26 #include <linux/list.h>
  27 #include <linux/wait.h>
  28 #include <linux/slab.h>
  29 #include <linux/pagemap.h>
  30 #include <linux/ctype.h>
  31 #include <linux/utsname.h>
  32 #include <linux/mempool.h>
  33 #include <linux/delay.h>
  34 #include <linux/completion.h>
  35 #include <linux/kthread.h>
  36 #include <linux/pagevec.h>
  37 #include <linux/freezer.h>
  38 #include <linux/namei.h>
  39 #include <linux/uuid.h>
  40 #include <linux/uaccess.h>
  41 #include <asm/processor.h>
  42 #include <linux/inet.h>
  43 #include <linux/module.h>
  44 #include <keys/user-type.h>
  45 #include <net/ipv6.h>
  46 #include <linux/parser.h>
  47 #include <linux/bvec.h>
  48 #include "cifspdu.h"
  49 #include "cifsglob.h"
  50 #include "cifsproto.h"
  51 #include "cifs_unicode.h"
  52 #include "cifs_debug.h"
  53 #include "cifs_fs_sb.h"
  54 #include "ntlmssp.h"
  55 #include "nterr.h"
  56 #include "rfc1002pdu.h"
  57 #include "fscache.h"
  58 #include "smb2proto.h"
  59 #include "smbdirect.h"
  60 #include "dns_resolve.h"
  61 #ifdef CONFIG_CIFS_DFS_UPCALL
  62 #include "dfs_cache.h"
  63 #endif
  64
  65 extern mempool_t *cifs_req_poolp;
  66 extern bool disable_legacy_dialects;
  67
  68 /* FIXME: should these be tunable? */
  69 #define TLINK_ERROR_EXPIRE      (1 * HZ)
  70 #define TLINK_IDLE_EXPIRE       (600 * HZ)
  71
  72 enum {
  73         /* Mount options that take no arguments */
  74         Opt_user_xattr, Opt_nouser_xattr,
  75         Opt_forceuid, Opt_noforceuid,
  76         Opt_forcegid, Opt_noforcegid,
  77         Opt_noblocksend, Opt_noautotune, Opt_nolease,
  78         Opt_hard, Opt_soft, Opt_perm, Opt_noperm, Opt_nodelete,
  79         Opt_mapposix, Opt_nomapposix,
  80         Opt_mapchars, Opt_nomapchars, Opt_sfu,
  81         Opt_nosfu, Opt_nodfs, Opt_posixpaths,
  82         Opt_noposixpaths, Opt_nounix, Opt_unix,
  83         Opt_nocase,
  84         Opt_brl, Opt_nobrl,
  85         Opt_handlecache, Opt_nohandlecache,
  86         Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
  87         Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
  88         Opt_nohard, Opt_nosoft,
  89         Opt_nointr, Opt_intr,
  90         Opt_nostrictsync, Opt_strictsync,
  91         Opt_serverino, Opt_noserverino,
  92         Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
  93         Opt_acl, Opt_noacl, Opt_locallease,
  94         Opt_sign, Opt_ignore_signature, Opt_seal, Opt_noac,
  95         Opt_fsc, Opt_mfsymlinks,
  96         Opt_multiuser, Opt_sloppy, Opt_nosharesock,
  97         Opt_persistent, Opt_nopersistent,
  98         Opt_resilient, Opt_noresilient,
  99         Opt_domainauto, Opt_rdma, Opt_modesid, Opt_rootfs,
 100         Opt_multichannel, Opt_nomultichannel,
 101         Opt_compress,
 102
 103         /* Mount options which take numeric value */
 104         Opt_backupuid, Opt_backupgid, Opt_uid,
 105         Opt_cruid, Opt_gid, Opt_file_mode,
 106         Opt_dirmode, Opt_port,
 107         Opt_min_enc_offload,
 108         Opt_blocksize, Opt_rsize, Opt_wsize, Opt_actimeo,
 109         Opt_echo_interval, Opt_max_credits, Opt_handletimeout,
 110         Opt_snapshot, Opt_max_channels,
 111
 112         /* Mount options which take string value */
 113         Opt_user, Opt_pass, Opt_ip,
 114         Opt_domain, Opt_srcaddr, Opt_iocharset,
 115         Opt_netbiosname, Opt_servern,
 116         Opt_ver, Opt_vers, Opt_sec, Opt_cache,
 117
 118         /* Mount options to be ignored */
 119         Opt_ignore,
 120
 121         /* Options which could be blank */
 122         Opt_blank_pass,
 123         Opt_blank_user,
 124         Opt_blank_ip,
 125
 126         Opt_err
 127 };
 128
 129 static const match_table_t cifs_mount_option_tokens = {
 130
 131         { Opt_user_xattr, "user_xattr" },
 132         { Opt_nouser_xattr, "nouser_xattr" },
 133         { Opt_forceuid, "forceuid" },
 134         { Opt_noforceuid, "noforceuid" },
 135         { Opt_forcegid, "forcegid" },
 136         { Opt_noforcegid, "noforcegid" },
 137         { Opt_noblocksend, "noblocksend" },
 138         { Opt_noautotune, "noautotune" },
 139         { Opt_nolease, "nolease" },
 140         { Opt_hard, "hard" },
 141         { Opt_soft, "soft" },
 142         { Opt_perm, "perm" },
 143         { Opt_noperm, "noperm" },
 144         { Opt_nodelete, "nodelete" },
 145         { Opt_mapchars, "mapchars" }, /* SFU style */
 146         { Opt_nomapchars, "nomapchars" },
 147         { Opt_mapposix, "mapposix" }, /* SFM style */
 148         { Opt_nomapposix, "nomapposix" },
 149         { Opt_sfu, "sfu" },
 150         { Opt_nosfu, "nosfu" },
 151         { Opt_nodfs, "nodfs" },
 152         { Opt_posixpaths, "posixpaths" },
 153         { Opt_noposixpaths, "noposixpaths" },
 154         { Opt_nounix, "nounix" },
 155         { Opt_nounix, "nolinux" },
 156         { Opt_nounix, "noposix" },
 157         { Opt_unix, "unix" },
 158         { Opt_unix, "linux" },
 159         { Opt_unix, "posix" },
 160         { Opt_nocase, "nocase" },
 161         { Opt_nocase, "ignorecase" },
 162         { Opt_brl, "brl" },
 163         { Opt_nobrl, "nobrl" },
 164         { Opt_handlecache, "handlecache" },
 165         { Opt_nohandlecache, "nohandlecache" },
 166         { Opt_nobrl, "nolock" },
 167         { Opt_forcemandatorylock, "forcemandatorylock" },
 168         { Opt_forcemandatorylock, "forcemand" },
 169         { Opt_setuids, "setuids" },
 170         { Opt_nosetuids, "nosetuids" },
 171         { Opt_setuidfromacl, "idsfromsid" },
 172         { Opt_dynperm, "dynperm" },
 173         { Opt_nodynperm, "nodynperm" },
 174         { Opt_nohard, "nohard" },
 175         { Opt_nosoft, "nosoft" },
 176         { Opt_nointr, "nointr" },
 177         { Opt_intr, "intr" },
 178         { Opt_nostrictsync, "nostrictsync" },
 179         { Opt_strictsync, "strictsync" },
 180         { Opt_serverino, "serverino" },
 181         { Opt_noserverino, "noserverino" },
 182         { Opt_rwpidforward, "rwpidforward" },
 183         { Opt_modesid, "modefromsid" },
 184         { Opt_cifsacl, "cifsacl" },
 185         { Opt_nocifsacl, "nocifsacl" },
 186         { Opt_acl, "acl" },
 187         { Opt_noacl, "noacl" },
 188         { Opt_locallease, "locallease" },
 189         { Opt_sign, "sign" },
 190         { Opt_ignore_signature, "signloosely" },
 191         { Opt_seal, "seal" },
 192         { Opt_noac, "noac" },
 193         { Opt_fsc, "fsc" },
 194         { Opt_mfsymlinks, "mfsymlinks" },
 195         { Opt_multiuser, "multiuser" },
 196         { Opt_sloppy, "sloppy" },
 197         { Opt_nosharesock, "nosharesock" },
 198         { Opt_persistent, "persistenthandles"},
 199         { Opt_nopersistent, "nopersistenthandles"},
 200         { Opt_resilient, "resilienthandles"},
 201         { Opt_noresilient, "noresilienthandles"},
 202         { Opt_domainauto, "domainauto"},
 203         { Opt_rdma, "rdma"},
 204         { Opt_multichannel, "multichannel" },
 205         { Opt_nomultichannel, "nomultichannel" },
 206
 207         { Opt_backupuid, "backupuid=%s" },
 208         { Opt_backupgid, "backupgid=%s" },
 209         { Opt_uid, "uid=%s" },
 210         { Opt_cruid, "cruid=%s" },
 211         { Opt_gid, "gid=%s" },
 212         { Opt_file_mode, "file_mode=%s" },
 213         { Opt_dirmode, "dirmode=%s" },
 214         { Opt_dirmode, "dir_mode=%s" },
 215         { Opt_port, "port=%s" },
 216         { Opt_min_enc_offload, "esize=%s" },
 217         { Opt_blocksize, "bsize=%s" },
 218         { Opt_rsize, "rsize=%s" },
 219         { Opt_wsize, "wsize=%s" },
 220         { Opt_actimeo, "actimeo=%s" },
 221         { Opt_handletimeout, "handletimeout=%s" },
 222         { Opt_echo_interval, "echo_interval=%s" },
 223         { Opt_max_credits, "max_credits=%s" },
 224         { Opt_snapshot, "snapshot=%s" },
 225         { Opt_max_channels, "max_channels=%s" },
 226         { Opt_compress, "compress=%s" },
 227
 228         { Opt_blank_user, "user=" },
 229         { Opt_blank_user, "username=" },
 230         { Opt_user, "user=%s" },
 231         { Opt_user, "username=%s" },
 232         { Opt_blank_pass, "pass=" },
 233         { Opt_blank_pass, "password=" },
 234         { Opt_pass, "pass=%s" },
 235         { Opt_pass, "password=%s" },
 236         { Opt_blank_ip, "ip=" },
 237         { Opt_blank_ip, "addr=" },
 238         { Opt_ip, "ip=%s" },
 239         { Opt_ip, "addr=%s" },
 240         { Opt_ignore, "unc=%s" },
 241         { Opt_ignore, "target=%s" },
 242         { Opt_ignore, "path=%s" },
 243         { Opt_domain, "dom=%s" },
 244         { Opt_domain, "domain=%s" },
 245         { Opt_domain, "workgroup=%s" },
 246         { Opt_srcaddr, "srcaddr=%s" },
 247         { Opt_ignore, "prefixpath=%s" },
 248         { Opt_iocharset, "iocharset=%s" },
 249         { Opt_netbiosname, "netbiosname=%s" },
 250         { Opt_servern, "servern=%s" },
 251         { Opt_ver, "ver=%s" },
 252         { Opt_vers, "vers=%s" },
 253         { Opt_sec, "sec=%s" },
 254         { Opt_cache, "cache=%s" },
 255
 256         { Opt_ignore, "cred" },
 257         { Opt_ignore, "credentials" },
 258         { Opt_ignore, "cred=%s" },
 259         { Opt_ignore, "credentials=%s" },
 260         { Opt_ignore, "guest" },
 261         { Opt_ignore, "rw" },
 262         { Opt_ignore, "ro" },
 263         { Opt_ignore, "suid" },
 264         { Opt_ignore, "nosuid" },
 265         { Opt_ignore, "exec" },
 266         { Opt_ignore, "noexec" },
 267         { Opt_ignore, "nodev" },
 268         { Opt_ignore, "noauto" },
 269         { Opt_ignore, "dev" },
 270         { Opt_ignore, "mand" },
 271         { Opt_ignore, "nomand" },
 272         { Opt_ignore, "relatime" },
 273         { Opt_ignore, "_netdev" },
 274         { Opt_rootfs, "rootfs" },
 275
 276         { Opt_err, NULL }
 277 };
 278
 279 enum {
 280         Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
 281         Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
 282         Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
 283         Opt_sec_ntlmv2i, Opt_sec_lanman,
 284         Opt_sec_none,
 285
 286         Opt_sec_err
 287 };
 288
 289 static const match_table_t cifs_secflavor_tokens = {
 290         { Opt_sec_krb5, "krb5" },
 291         { Opt_sec_krb5i, "krb5i" },
 292         { Opt_sec_krb5p, "krb5p" },
 293         { Opt_sec_ntlmsspi, "ntlmsspi" },
 294         { Opt_sec_ntlmssp, "ntlmssp" },
 295         { Opt_ntlm, "ntlm" },
 296         { Opt_sec_ntlmi, "ntlmi" },
 297         { Opt_sec_ntlmv2, "nontlm" },
 298         { Opt_sec_ntlmv2, "ntlmv2" },
 299         { Opt_sec_ntlmv2i, "ntlmv2i" },
 300         { Opt_sec_lanman, "lanman" },
 301         { Opt_sec_none, "none" },
 302
 303         { Opt_sec_err, NULL }
 304 };
 305
 306 /* cache flavors */
 307 enum {
 308         Opt_cache_loose,
 309         Opt_cache_strict,
 310         Opt_cache_none,
 311         Opt_cache_ro,
 312         Opt_cache_rw,
 313         Opt_cache_err
 314 };
 315
 316 static const match_table_t cifs_cacheflavor_tokens = {
 317         { Opt_cache_loose, "loose" },
 318         { Opt_cache_strict, "strict" },
 319         { Opt_cache_none, "none" },
 320         { Opt_cache_ro, "ro" },
 321         { Opt_cache_rw, "singleclient" },
 322         { Opt_cache_err, NULL }
 323 };
 324
 325 static const match_table_t cifs_smb_version_tokens = {
 326         { Smb_1, SMB1_VERSION_STRING },
 327         { Smb_20, SMB20_VERSION_STRING},
 328         { Smb_21, SMB21_VERSION_STRING },
 329         { Smb_30, SMB30_VERSION_STRING },
 330         { Smb_302, SMB302_VERSION_STRING },
 331         { Smb_302, ALT_SMB302_VERSION_STRING },
 332         { Smb_311, SMB311_VERSION_STRING },
 333         { Smb_311, ALT_SMB311_VERSION_STRING },
 334         { Smb_3any, SMB3ANY_VERSION_STRING },
 335         { Smb_default, SMBDEFAULT_VERSION_STRING },
 336         { Smb_version_err, NULL }
 337 };
 338
 339 static int ip_connect(struct TCP_Server_Info *server);
 340 static int generic_ip_connect(struct TCP_Server_Info *server);
 341 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
 342 static void cifs_prune_tlinks(struct work_struct *work);
 343 static char *extract_hostname(const char *unc);
 344
 345 /*
 346  * Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
 347  * get their ip addresses changed at some point.
 348  *
 349  * This should be called with server->srv_mutex held.
 350  */
 351 #ifdef CONFIG_CIFS_DFS_UPCALL
 352 static int reconn_set_ipaddr(struct TCP_Server_Info *server)
 353 {
 354         int rc;
 355         int len;
 356         char *unc, *ipaddr = NULL;
 357
 358         if (!server->hostname)
 359                 return -EINVAL;
 360
 361         len = strlen(server->hostname) + 3;
 362
 363         unc = kmalloc(len, GFP_KERNEL);
 364         if (!unc) {
 365                 cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
 366                 return -ENOMEM;
 367         }
 368         scnprintf(unc, len, "\\\\%s", server->hostname);
 369
 370         rc = dns_resolve_server_name_to_ip(unc, &ipaddr);
 371         kfree(unc);
 372
 373         if (rc < 0) {
 374                 cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
 375                          __func__, server->hostname, rc);
 376                 return rc;
 377         }
 378
 379         spin_lock(&cifs_tcp_ses_lock);
 380         rc = cifs_convert_address((struct sockaddr *)&server->dstaddr, ipaddr,
 381                                   strlen(ipaddr));
 382         spin_unlock(&cifs_tcp_ses_lock);
 383         kfree(ipaddr);
 384
 385         return !rc ? -1 : 0;
 386 }
 387 #else
 388 static inline int reconn_set_ipaddr(struct TCP_Server_Info *server)
 389 {
 390         return 0;
 391 }
 392 #endif
 393
 394 #ifdef CONFIG_CIFS_DFS_UPCALL
 395 /* These functions must be called with server->srv_mutex held */
 396 static void reconn_inval_dfs_target(struct TCP_Server_Info *server,
 397                                     struct cifs_sb_info *cifs_sb,
 398                                     struct dfs_cache_tgt_list *tgt_list,
 399                                     struct dfs_cache_tgt_iterator **tgt_it)
 400 {
 401         const char *name;
 402
 403         if (!cifs_sb || !cifs_sb->origin_fullpath || !tgt_list ||
 404             !server->nr_targets)
 405                 return;
 406
 407         if (!*tgt_it) {
 408                 *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
 409         } else {
 410                 *tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it);
 411                 if (!*tgt_it)
 412                         *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
 413         }
 414
 415         cifs_dbg(FYI, "%s: UNC: %s\n", __func__, cifs_sb->origin_fullpath);
 416
 417         name = dfs_cache_get_tgt_name(*tgt_it);
 418
 419         kfree(server->hostname);
 420
 421         server->hostname = extract_hostname(name);
 422         if (IS_ERR(server->hostname)) {
 423                 cifs_dbg(FYI,
 424                          "%s: failed to extract hostname from target: %ld\n",
 425                          __func__, PTR_ERR(server->hostname));
 426         }
 427 }
 428
 429 static inline int reconn_setup_dfs_targets(struct cifs_sb_info *cifs_sb,
 430                                            struct dfs_cache_tgt_list *tl)
 431 {
 432         if (!cifs_sb->origin_fullpath)
 433                 return -EOPNOTSUPP;
 434         return dfs_cache_noreq_find(cifs_sb->origin_fullpath + 1, NULL, tl);
 435 }
 436 #endif
 437
 438 /*
 439  * cifs tcp session reconnection
 440  *
 441  * mark tcp session as reconnecting so temporarily locked
 442  * mark all smb sessions as reconnecting for tcp session
 443  * reconnect tcp session
 444  * wake up waiters on reconnection? - (not needed currently)
 445  */
 446 int
 447 cifs_reconnect(struct TCP_Server_Info *server)
 448 {
 449         int rc = 0;
 450         struct list_head *tmp, *tmp2;
 451         struct cifs_ses *ses;
 452         struct cifs_tcon *tcon;
 453         struct mid_q_entry *mid_entry;
 454         struct list_head retry_list;
 455 #ifdef CONFIG_CIFS_DFS_UPCALL
 456         struct super_block *sb = NULL;
 457         struct cifs_sb_info *cifs_sb = NULL;
 458         struct dfs_cache_tgt_list tgt_list = {0};
 459         struct dfs_cache_tgt_iterator *tgt_it = NULL;
 460 #endif
 461
 462         spin_lock(&GlobalMid_Lock);
 463         server->nr_targets = 1;
 464 #ifdef CONFIG_CIFS_DFS_UPCALL
 465         spin_unlock(&GlobalMid_Lock);
 466         sb = cifs_get_tcp_super(server);
 467         if (IS_ERR(sb)) {
 468                 rc = PTR_ERR(sb);
 469                 cifs_dbg(FYI, "%s: will not do DFS failover: rc = %d\n",
 470                          __func__, rc);
 471                 sb = NULL;
 472         } else {
 473                 cifs_sb = CIFS_SB(sb);
 474
 475                 rc = reconn_setup_dfs_targets(cifs_sb, &tgt_list);
 476                 if (rc && (rc != -EOPNOTSUPP)) {
 477                         cifs_server_dbg(VFS, "%s: no target servers for DFS failover\n",
 478                                  __func__);
 479                 } else {
 480                         server->nr_targets = dfs_cache_get_nr_tgts(&tgt_list);
 481                 }
 482         }
 483         cifs_dbg(FYI, "%s: will retry %d target(s)\n", __func__,
 484                  server->nr_targets);
 485         spin_lock(&GlobalMid_Lock);
 486 #endif
 487         if (server->tcpStatus == CifsExiting) {
 488                 /* the demux thread will exit normally
 489                 next time through the loop */
 490                 spin_unlock(&GlobalMid_Lock);
 491 #ifdef CONFIG_CIFS_DFS_UPCALL
 492                 dfs_cache_free_tgts(&tgt_list);
 493                 cifs_put_tcp_super(sb);
 494 #endif
 495                 wake_up(&server->response_q);
 496                 return rc;
 497         } else
 498                 server->tcpStatus = CifsNeedReconnect;
 499         spin_unlock(&GlobalMid_Lock);
 500         server->maxBuf = 0;
 501         server->max_read = 0;
 502
 503         cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
 504         trace_smb3_reconnect(server->CurrentMid, server->hostname);
 505
 506         /* before reconnecting the tcp session, mark the smb session (uid)
 507                 and the tid bad so they are not used until reconnected */
 508         cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
 509                  __func__);
 510         spin_lock(&cifs_tcp_ses_lock);
 511         list_for_each(tmp, &server->smb_ses_list) {
 512                 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 513                 ses->need_reconnect = true;
 514                 list_for_each(tmp2, &ses->tcon_list) {
 515                         tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
 516                         tcon->need_reconnect = true;
 517                 }
 518                 if (ses->tcon_ipc)
 519                         ses->tcon_ipc->need_reconnect = true;
 520         }
 521         spin_unlock(&cifs_tcp_ses_lock);
 522
 523         /* do not want to be sending data on a socket we are freeing */
 524         cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
 525         mutex_lock(&server->srv_mutex);
 526         if (server->ssocket) {
 527                 cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
 528                          server->ssocket->state, server->ssocket->flags);
 529                 kernel_sock_shutdown(server->ssocket, SHUT_WR);
 530                 cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
 531                          server->ssocket->state, server->ssocket->flags);
 532                 sock_release(server->ssocket);
 533                 server->ssocket = NULL;
 534         }
 535         server->sequence_number = 0;
 536         server->session_estab = false;
 537         kfree(server->session_key.response);
 538         server->session_key.response = NULL;
 539         server->session_key.len = 0;
 540         server->lstrp = jiffies;
 541
 542         /* mark submitted MIDs for retry and issue callback */
 543         INIT_LIST_HEAD(&retry_list);
 544         cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
 545         spin_lock(&GlobalMid_Lock);
 546         list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
 547                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 548                 kref_get(&mid_entry->refcount);
 549                 if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
 550                         mid_entry->mid_state = MID_RETRY_NEEDED;
 551                 list_move(&mid_entry->qhead, &retry_list);
 552                 mid_entry->mid_flags |= MID_DELETED;
 553         }
 554         spin_unlock(&GlobalMid_Lock);
 555         mutex_unlock(&server->srv_mutex);
 556
 557         cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
 558         list_for_each_safe(tmp, tmp2, &retry_list) {
 559                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 560                 list_del_init(&mid_entry->qhead);
 561                 mid_entry->callback(mid_entry);
 562                 cifs_mid_q_entry_release(mid_entry);
 563         }
 564
 565         if (cifs_rdma_enabled(server)) {
 566                 mutex_lock(&server->srv_mutex);
 567                 smbd_destroy(server);
 568                 mutex_unlock(&server->srv_mutex);
 569         }
 570
 571         do {
 572                 try_to_freeze();
 573
 574                 mutex_lock(&server->srv_mutex);
 575 #ifdef CONFIG_CIFS_DFS_UPCALL
 576                 /*
 577                  * Set up next DFS target server (if any) for reconnect. If DFS
 578                  * feature is disabled, then we will retry last server we
 579                  * connected to before.
 580                  */
 581                 reconn_inval_dfs_target(server, cifs_sb, &tgt_list, &tgt_it);
 582 #endif
 583                 rc = reconn_set_ipaddr(server);
 584                 if (rc) {
 585                         cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
 586                                  __func__, rc);
 587                 }
 588
 589                 if (cifs_rdma_enabled(server))
 590                         rc = smbd_reconnect(server);
 591                 else
 592                         rc = generic_ip_connect(server);
 593                 if (rc) {
 594                         cifs_dbg(FYI, "reconnect error %d\n", rc);
 595                         mutex_unlock(&server->srv_mutex);
 596                         msleep(3000);
 597                 } else {
 598                         atomic_inc(&tcpSesReconnectCount);
 599                         set_credits(server, 1);
 600                         spin_lock(&GlobalMid_Lock);
 601                         if (server->tcpStatus != CifsExiting)
 602                                 server->tcpStatus = CifsNeedNegotiate;
 603                         spin_unlock(&GlobalMid_Lock);
 604                         mutex_unlock(&server->srv_mutex);
 605                 }
 606         } while (server->tcpStatus == CifsNeedReconnect);
 607
 608 #ifdef CONFIG_CIFS_DFS_UPCALL
 609         if (tgt_it) {
 610                 rc = dfs_cache_noreq_update_tgthint(cifs_sb->origin_fullpath + 1,
 611                                                     tgt_it);
 612                 if (rc) {
 613                         cifs_server_dbg(VFS, "%s: failed to update DFS target hint: rc = %d\n",
 614                                  __func__, rc);
 615                 }
 616                 rc = dfs_cache_update_vol(cifs_sb->origin_fullpath, server);
 617                 if (rc) {
 618                         cifs_server_dbg(VFS, "%s: failed to update vol info in DFS cache: rc = %d\n",
 619                                  __func__, rc);
 620                 }
 621                 dfs_cache_free_tgts(&tgt_list);
 622
 623         }
 624
 625         cifs_put_tcp_super(sb);
 626 #endif
 627         if (server->tcpStatus == CifsNeedNegotiate)
 628                 mod_delayed_work(cifsiod_wq, &server->echo, 0);
 629
 630         wake_up(&server->response_q);
 631         return rc;
 632 }
 633
 634 static void
 635 cifs_echo_request(struct work_struct *work)
 636 {
 637         int rc;
 638         struct TCP_Server_Info *server = container_of(work,
 639                                         struct TCP_Server_Info, echo.work);
 640         unsigned long echo_interval;
 641
 642         /*
 643          * If we need to renegotiate, set echo interval to zero to
 644          * immediately call echo service where we can renegotiate.
 645          */
 646         if (server->tcpStatus == CifsNeedNegotiate)
 647                 echo_interval = 0;
 648         else
 649                 echo_interval = server->echo_interval;
 650
 651         /*
 652          * We cannot send an echo if it is disabled.
 653          * Also, no need to ping if we got a response recently.
 654          */
 655
 656         if (server->tcpStatus == CifsNeedReconnect ||
 657             server->tcpStatus == CifsExiting ||
 658             server->tcpStatus == CifsNew ||
 659             (server->ops->can_echo && !server->ops->can_echo(server)) ||
 660             time_before(jiffies, server->lstrp + echo_interval - HZ))
 661                 goto requeue_echo;
 662
 663         rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
 664         if (rc)
 665                 cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
 666                          server->hostname);
 667
 668 requeue_echo:
 669         queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
 670 }
 671
 672 static bool
 673 allocate_buffers(struct TCP_Server_Info *server)
 674 {
 675         if (!server->bigbuf) {
 676                 server->bigbuf = (char *)cifs_buf_get();
 677                 if (!server->bigbuf) {
 678                         cifs_server_dbg(VFS, "No memory for large SMB response\n");
 679                         msleep(3000);
 680                         /* retry will check if exiting */
 681                         return false;
 682                 }
 683         } else if (server->large_buf) {
 684                 /* we are reusing a dirty large buf, clear its start */
 685                 memset(server->bigbuf, 0, HEADER_SIZE(server));
 686         }
 687
 688         if (!server->smallbuf) {
 689                 server->smallbuf = (char *)cifs_small_buf_get();
 690                 if (!server->smallbuf) {
 691                         cifs_server_dbg(VFS, "No memory for SMB response\n");
 692                         msleep(1000);
 693                         /* retry will check if exiting */
 694                         return false;
 695                 }
 696                 /* beginning of smb buffer is cleared in our buf_get */
 697         } else {
 698                 /* if existing small buf clear beginning */
 699                 memset(server->smallbuf, 0, HEADER_SIZE(server));
 700         }
 701
 702         return true;
 703 }
 704
 705 static bool
 706 server_unresponsive(struct TCP_Server_Info *server)
 707 {
 708         /*
 709          * We need to wait 3 echo intervals to make sure we handle such
 710          * situations right:
 711          * 1s  client sends a normal SMB request
 712          * 2s  client gets a response
 713          * 30s echo workqueue job pops, and decides we got a response recently
 714          *     and don't need to send another
 715          * ...
 716          * 65s kernel_recvmsg times out, and we see that we haven't gotten
 717          *     a response in >60s.
 718          */
 719         if ((server->tcpStatus == CifsGood ||
 720             server->tcpStatus == CifsNeedNegotiate) &&
 721             time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
 722                 cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
 723                          (3 * server->echo_interval) / HZ);
 724                 cifs_reconnect(server);
 725                 return true;
 726         }
 727
 728         return false;
 729 }
 730
 731 static inline bool
 732 zero_credits(struct TCP_Server_Info *server)
 733 {
 734         int val;
 735
 736         spin_lock(&server->req_lock);
 737         val = server->credits + server->echo_credits + server->oplock_credits;
 738         if (server->in_flight == 0 && val == 0) {
 739                 spin_unlock(&server->req_lock);
 740                 return true;
 741         }
 742         spin_unlock(&server->req_lock);
 743         return false;
 744 }
 745
 746 static int
 747 cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
 748 {
 749         int length = 0;
 750         int total_read;
 751
 752         smb_msg->msg_control = NULL;
 753         smb_msg->msg_controllen = 0;
 754
 755         for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
 756                 try_to_freeze();
 757
 758                 /* reconnect if no credits and no requests in flight */
 759                 if (zero_credits(server)) {
 760                         cifs_reconnect(server);
 761                         return -ECONNABORTED;
 762                 }
 763
 764                 if (server_unresponsive(server))
 765                         return -ECONNABORTED;
 766                 if (cifs_rdma_enabled(server) && server->smbd_conn)
 767                         length = smbd_recv(server->smbd_conn, smb_msg);
 768                 else
 769                         length = sock_recvmsg(server->ssocket, smb_msg, 0);
 770
 771                 if (server->tcpStatus == CifsExiting)
 772                         return -ESHUTDOWN;
 773
 774                 if (server->tcpStatus == CifsNeedReconnect) {
 775                         cifs_reconnect(server);
 776                         return -ECONNABORTED;
 777                 }
 778
 779                 if (length == -ERESTARTSYS ||
 780                     length == -EAGAIN ||
 781                     length == -EINTR) {
 782                         /*
 783                          * Minimum sleep to prevent looping, allowing socket
 784                          * to clear and app threads to set tcpStatus
 785                          * CifsNeedReconnect if server hung.
 786                          */
 787                         usleep_range(1000, 2000);
 788                         length = 0;
 789                         continue;
 790                 }
 791
 792                 if (length <= 0) {
 793                         cifs_dbg(FYI, "Received no data or error: %d\n", length);
 794                         cifs_reconnect(server);
 795                         return -ECONNABORTED;
 796                 }
 797         }
 798         return total_read;
 799 }
 800
 801 int
 802 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
 803                       unsigned int to_read)
 804 {
 805         struct msghdr smb_msg;
 806         struct kvec iov = {.iov_base = buf, .iov_len = to_read};
 807         iov_iter_kvec(&smb_msg.msg_iter, READ, &iov, 1, to_read);
 808
 809         return cifs_readv_from_socket(server, &smb_msg);
 810 }
 811
 812 int
 813 cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
 814         unsigned int page_offset, unsigned int to_read)
 815 {
 816         struct msghdr smb_msg;
 817         struct bio_vec bv = {
 818                 .bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
 819         iov_iter_bvec(&smb_msg.msg_iter, READ, &bv, 1, to_read);
 820         return cifs_readv_from_socket(server, &smb_msg);
 821 }
 822
 823 static bool
 824 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
 825 {
 826         /*
 827          * The first byte big endian of the length field,
 828          * is actually not part of the length but the type
 829          * with the most common, zero, as regular data.
 830          */
 831         switch (type) {
 832         case RFC1002_SESSION_MESSAGE:
 833                 /* Regular SMB response */
 834                 return true;
 835         case RFC1002_SESSION_KEEP_ALIVE:
 836                 cifs_dbg(FYI, "RFC 1002 session keep alive\n");
 837                 break;
 838         case RFC1002_POSITIVE_SESSION_RESPONSE:
 839                 cifs_dbg(FYI, "RFC 1002 positive session response\n");
 840                 break;
 841         case RFC1002_NEGATIVE_SESSION_RESPONSE:
 842                 /*
 843                  * We get this from Windows 98 instead of an error on
 844                  * SMB negprot response.
 845                  */
 846                 cifs_dbg(FYI, "RFC 1002 negative session response\n");
 847                 /* give server a second to clean up */
 848                 msleep(1000);
 849                 /*
 850                  * Always try 445 first on reconnect since we get NACK
 851                  * on some if we ever connected to port 139 (the NACK
 852                  * is since we do not begin with RFC1001 session
 853                  * initialize frame).
 854                  */
 855                 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
 856                 cifs_reconnect(server);
 857                 break;
 858         default:
 859                 cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
 860                 cifs_reconnect(server);
 861         }
 862
 863         return false;
 864 }
 865
 866 void
 867 dequeue_mid(struct mid_q_entry *mid, bool malformed)
 868 {
 869 #ifdef CONFIG_CIFS_STATS2
 870         mid->when_received = jiffies;
 871 #endif
 872         spin_lock(&GlobalMid_Lock);
 873         if (!malformed)
 874                 mid->mid_state = MID_RESPONSE_RECEIVED;
 875         else
 876                 mid->mid_state = MID_RESPONSE_MALFORMED;
 877         /*
 878          * Trying to handle/dequeue a mid after the send_recv()
 879          * function has finished processing it is a bug.
 880          */
 881         if (mid->mid_flags & MID_DELETED)
 882                 pr_warn_once("trying to dequeue a deleted mid\n");
 883         else {
 884                 list_del_init(&mid->qhead);
 885                 mid->mid_flags |= MID_DELETED;
 886         }
 887         spin_unlock(&GlobalMid_Lock);
 888 }
 889
 890 static unsigned int
 891 smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
 892 {
 893         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
 894
 895         /*
 896          * SMB1 does not use credits.
 897          */
 898         if (server->vals->header_preamble_size)
 899                 return 0;
 900
 901         return le16_to_cpu(shdr->CreditRequest);
 902 }
 903
 904 static void
 905 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
 906            char *buf, int malformed)
 907 {
 908         if (server->ops->check_trans2 &&
 909             server->ops->check_trans2(mid, server, buf, malformed))
 910                 return;
 911         mid->credits_received = smb2_get_credits_from_hdr(buf, server);
 912         mid->resp_buf = buf;
 913         mid->large_buf = server->large_buf;
 914         /* Was previous buf put in mpx struct for multi-rsp? */
 915         if (!mid->multiRsp) {
 916                 /* smb buffer will be freed by user thread */
 917                 if (server->large_buf)
 918                         server->bigbuf = NULL;
 919                 else
 920                         server->smallbuf = NULL;
 921         }
 922         dequeue_mid(mid, malformed);
 923 }
 924
 925 static void clean_demultiplex_info(struct TCP_Server_Info *server)
 926 {
 927         int length;
 928
 929         /* take it off the list, if it's not already */
 930         spin_lock(&cifs_tcp_ses_lock);
 931         list_del_init(&server->tcp_ses_list);
 932         spin_unlock(&cifs_tcp_ses_lock);
 933
 934         spin_lock(&GlobalMid_Lock);
 935         server->tcpStatus = CifsExiting;
 936         spin_unlock(&GlobalMid_Lock);
 937         wake_up_all(&server->response_q);
 938
 939         /* check if we have blocked requests that need to free */
 940         spin_lock(&server->req_lock);
 941         if (server->credits <= 0)
 942                 server->credits = 1;
 943         spin_unlock(&server->req_lock);
 944         /*
 945          * Although there should not be any requests blocked on this queue it
 946          * can not hurt to be paranoid and try to wake up requests that may
 947          * haven been blocked when more than 50 at time were on the wire to the
 948          * same server - they now will see the session is in exit state and get
 949          * out of SendReceive.
 950          */
 951         wake_up_all(&server->request_q);
 952         /* give those requests time to exit */
 953         msleep(125);
 954         if (cifs_rdma_enabled(server))
 955                 smbd_destroy(server);
 956         if (server->ssocket) {
 957                 sock_release(server->ssocket);
 958                 server->ssocket = NULL;
 959         }
 960
 961         if (!list_empty(&server->pending_mid_q)) {
 962                 struct list_head dispose_list;
 963                 struct mid_q_entry *mid_entry;
 964                 struct list_head *tmp, *tmp2;
 965
 966                 INIT_LIST_HEAD(&dispose_list);
 967                 spin_lock(&GlobalMid_Lock);
 968                 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
 969                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 970                         cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
 971                         kref_get(&mid_entry->refcount);
 972                         mid_entry->mid_state = MID_SHUTDOWN;
 973                         list_move(&mid_entry->qhead, &dispose_list);
 974                         mid_entry->mid_flags |= MID_DELETED;
 975                 }
 976                 spin_unlock(&GlobalMid_Lock);
 977
 978                 /* now walk dispose list and issue callbacks */
 979                 list_for_each_safe(tmp, tmp2, &dispose_list) {
 980                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 981                         cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
 982                         list_del_init(&mid_entry->qhead);
 983                         mid_entry->callback(mid_entry);
 984                         cifs_mid_q_entry_release(mid_entry);
 985                 }
 986                 /* 1/8th of sec is more than enough time for them to exit */
 987                 msleep(125);
 988         }
 989
 990         if (!list_empty(&server->pending_mid_q)) {
 991                 /*
 992                  * mpx threads have not exited yet give them at least the smb
 993                  * send timeout time for long ops.
 994                  *
 995                  * Due to delays on oplock break requests, we need to wait at
 996                  * least 45 seconds before giving up on a request getting a
 997                  * response and going ahead and killing cifsd.
 998                  */
 999                 cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
1000                 msleep(46000);
1001                 /*
1002                  * If threads still have not exited they are probably never
1003                  * coming home not much else we can do but free the memory.
1004                  */
1005         }
1006
1007         kfree(server->hostname);
1008         kfree(server);
1009
1010         length = atomic_dec_return(&tcpSesAllocCount);
1011         if (length > 0)
1012                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1013 }
1014
1015 static int
1016 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1017 {
1018         int length;
1019         char *buf = server->smallbuf;
1020         unsigned int pdu_length = server->pdu_size;
1021
1022         /* make sure this will fit in a large buffer */
1023         if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
1024                 server->vals->header_preamble_size) {
1025                 cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
1026                 cifs_reconnect(server);
1027                 return -ECONNABORTED;
1028         }
1029
1030         /* switch to large buffer if too big for a small one */
1031         if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
1032                 server->large_buf = true;
1033                 memcpy(server->bigbuf, buf, server->total_read);
1034                 buf = server->bigbuf;
1035         }
1036
1037         /* now read the rest */
1038         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
1039                                        pdu_length - HEADER_SIZE(server) + 1
1040                                        + server->vals->header_preamble_size);
1041
1042         if (length < 0)
1043                 return length;
1044         server->total_read += length;
1045
1046         dump_smb(buf, server->total_read);
1047
1048         return cifs_handle_standard(server, mid);
1049 }
1050
1051 int
1052 cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
1053 {
1054         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
1055         int length;
1056
1057         /*
1058          * We know that we received enough to get to the MID as we
1059          * checked the pdu_length earlier. Now check to see
1060          * if the rest of the header is OK. We borrow the length
1061          * var for the rest of the loop to avoid a new stack var.
1062          *
1063          * 48 bytes is enough to display the header and a little bit
1064          * into the payload for debugging purposes.
1065          */
1066         length = server->ops->check_message(buf, server->total_read, server);
1067         if (length != 0)
1068                 cifs_dump_mem("Bad SMB: ", buf,
1069                         min_t(unsigned int, server->total_read, 48));
1070
1071         if (server->ops->is_session_expired &&
1072             server->ops->is_session_expired(buf)) {
1073                 cifs_reconnect(server);
1074                 return -1;
1075         }
1076
1077         if (server->ops->is_status_pending &&
1078             server->ops->is_status_pending(buf, server))
1079                 return -1;
1080
1081         if (!mid)
1082                 return length;
1083
1084         handle_mid(mid, server, buf, length);
1085         return 0;
1086 }
1087
1088 static void
1089 smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
1090 {
1091         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
1092
1093         /*
1094          * SMB1 does not use credits.
1095          */
1096         if (server->vals->header_preamble_size)
1097                 return;
1098
1099         if (shdr->CreditRequest) {
1100                 spin_lock(&server->req_lock);
1101                 server->credits += le16_to_cpu(shdr->CreditRequest);
1102                 spin_unlock(&server->req_lock);
1103                 wake_up(&server->request_q);
1104         }
1105 }
1106
1107
1108 static int
1109 cifs_demultiplex_thread(void *p)
1110 {
1111         int i, num_mids, length;
1112         struct TCP_Server_Info *server = p;
1113         unsigned int pdu_length;
1114         unsigned int next_offset;
1115         char *buf = NULL;
1116         struct task_struct *task_to_wake = NULL;
1117         struct mid_q_entry *mids[MAX_COMPOUND];
1118         char *bufs[MAX_COMPOUND];
1119         unsigned int noreclaim_flag;
1120
1121         noreclaim_flag = memalloc_noreclaim_save();
1122         cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
1123
1124         length = atomic_inc_return(&tcpSesAllocCount);
1125         if (length > 1)
1126                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
1127
1128         set_freezable();
1129         allow_kernel_signal(SIGKILL);
1130         while (server->tcpStatus != CifsExiting) {
1131                 if (try_to_freeze())
1132                         continue;
1133
1134                 if (!allocate_buffers(server))
1135                         continue;
1136
1137                 server->large_buf = false;
1138                 buf = server->smallbuf;
1139                 pdu_length = 4; /* enough to get RFC1001 header */
1140
1141                 length = cifs_read_from_socket(server, buf, pdu_length);
1142                 if (length < 0)
1143                         continue;
1144
1145                 if (server->vals->header_preamble_size == 0)
1146                         server->total_read = 0;
1147                 else
1148                         server->total_read = length;
1149
1150                 /*
1151                  * The right amount was read from socket - 4 bytes,
1152                  * so we can now interpret the length field.
1153                  */
1154                 pdu_length = get_rfc1002_length(buf);
1155
1156                 cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
1157                 if (!is_smb_response(server, buf[0]))
1158                         continue;
1159 next_pdu:
1160                 server->pdu_size = pdu_length;
1161
1162                 /* make sure we have enough to get to the MID */
1163                 if (server->pdu_size < HEADER_SIZE(server) - 1 -
1164                     server->vals->header_preamble_size) {
1165                         cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
1166                                  server->pdu_size);
1167                         cifs_reconnect(server);
1168                         continue;
1169                 }
1170
1171                 /* read down to the MID */
1172                 length = cifs_read_from_socket(server,
1173                              buf + server->vals->header_preamble_size,
1174                              HEADER_SIZE(server) - 1
1175                              - server->vals->header_preamble_size);
1176                 if (length < 0)
1177                         continue;
1178                 server->total_read += length;
1179
1180                 if (server->ops->next_header) {
1181                         next_offset = server->ops->next_header(buf);
1182                         if (next_offset)
1183                                 server->pdu_size = next_offset;
1184                 }
1185
1186                 memset(mids, 0, sizeof(mids));
1187                 memset(bufs, 0, sizeof(bufs));
1188                 num_mids = 0;
1189
1190                 if (server->ops->is_transform_hdr &&
1191                     server->ops->receive_transform &&
1192                     server->ops->is_transform_hdr(buf)) {
1193                         length = server->ops->receive_transform(server,
1194                                                                 mids,
1195                                                                 bufs,
1196                                                                 &num_mids);
1197                 } else {
1198                         mids[0] = server->ops->find_mid(server, buf);
1199                         bufs[0] = buf;
1200                         num_mids = 1;
1201
1202                         if (!mids[0] || !mids[0]->receive)
1203                                 length = standard_receive3(server, mids[0]);
1204                         else
1205                                 length = mids[0]->receive(server, mids[0]);
1206                 }
1207
1208                 if (length < 0) {
1209                         for (i = 0; i < num_mids; i++)
1210                                 if (mids[i])
1211                                         cifs_mid_q_entry_release(mids[i]);
1212                         continue;
1213                 }
1214
1215                 server->lstrp = jiffies;
1216
1217                 for (i = 0; i < num_mids; i++) {
1218                         if (mids[i] != NULL) {
1219                                 mids[i]->resp_buf_size = server->pdu_size;
1220
1221                                 if (!mids[i]->multiRsp || mids[i]->multiEnd)
1222                                         mids[i]->callback(mids[i]);
1223
1224                                 cifs_mid_q_entry_release(mids[i]);
1225                         } else if (server->ops->is_oplock_break &&
1226                                    server->ops->is_oplock_break(bufs[i],
1227                                                                 server)) {
1228                                 smb2_add_credits_from_hdr(bufs[i], server);
1229                                 cifs_dbg(FYI, "Received oplock break\n");
1230                         } else {
1231                                 cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
1232                                                 atomic_read(&midCount));
1233                                 cifs_dump_mem("Received Data is: ", bufs[i],
1234                                               HEADER_SIZE(server));
1235                                 smb2_add_credits_from_hdr(bufs[i], server);
1236 #ifdef CONFIG_CIFS_DEBUG2
1237                                 if (server->ops->dump_detail)
1238                                         server->ops->dump_detail(bufs[i],
1239                                                                  server);
1240                                 cifs_dump_mids(server);
1241 #endif /* CIFS_DEBUG2 */
1242                         }
1243                 }
1244
1245                 if (pdu_length > server->pdu_size) {
1246                         if (!allocate_buffers(server))
1247                                 continue;
1248                         pdu_length -= server->pdu_size;
1249                         server->total_read = 0;
1250                         server->large_buf = false;
1251                         buf = server->smallbuf;
1252                         goto next_pdu;
1253                 }
1254         } /* end while !EXITING */
1255
1256         /* buffer usually freed in free_mid - need to free it here on exit */
1257         cifs_buf_release(server->bigbuf);
1258         if (server->smallbuf) /* no sense logging a debug message if NULL */
1259                 cifs_small_buf_release(server->smallbuf);
1260
1261         task_to_wake = xchg(&server->tsk, NULL);
1262         clean_demultiplex_info(server);
1263
1264         /* if server->tsk was NULL then wait for a signal before exiting */
1265         if (!task_to_wake) {
1266                 set_current_state(TASK_INTERRUPTIBLE);
1267                 while (!signal_pending(current)) {
1268                         schedule();
1269                         set_current_state(TASK_INTERRUPTIBLE);
1270                 }
1271                 set_current_state(TASK_RUNNING);
1272         }
1273
1274         memalloc_noreclaim_restore(noreclaim_flag);
1275         module_put_and_exit(0);
1276 }
1277
1278 /* extract the host portion of the UNC string */
1279 static char *
1280 extract_hostname(const char *unc)
1281 {
1282         const char *src;
1283         char *dst, *delim;
1284         unsigned int len;
1285
1286         /* skip double chars at beginning of string */
1287         /* BB: check validity of these bytes? */
1288         if (strlen(unc) < 3)
1289                 return ERR_PTR(-EINVAL);
1290         for (src = unc; *src && *src == '\\'; src++)
1291                 ;
1292         if (!*src)
1293                 return ERR_PTR(-EINVAL);
1294
1295         /* delimiter between hostname and sharename is always '\\' now */
1296         delim = strchr(src, '\\');
1297         if (!delim)
1298                 return ERR_PTR(-EINVAL);
1299
1300         len = delim - src;
1301         dst = kmalloc((len + 1), GFP_KERNEL);
1302         if (dst == NULL)
1303                 return ERR_PTR(-ENOMEM);
1304
1305         memcpy(dst, src, len);
1306         dst[len] = '\0';
1307
1308         return dst;
1309 }
1310
1311 static int get_option_ul(substring_t args[], unsigned long *option)
1312 {
1313         int rc;
1314         char *string;
1315
1316         string = match_strdup(args);
1317         if (string == NULL)
1318                 return -ENOMEM;
1319         rc = kstrtoul(string, 0, option);
1320         kfree(string);
1321
1322         return rc;
1323 }
1324
1325 static int get_option_uid(substring_t args[], kuid_t *result)
1326 {
1327         unsigned long value;
1328         kuid_t uid;
1329         int rc;
1330
1331         rc = get_option_ul(args, &value);
1332         if (rc)
1333                 return rc;
1334
1335         uid = make_kuid(current_user_ns(), value);
1336         if (!uid_valid(uid))
1337                 return -EINVAL;
1338
1339         *result = uid;
1340         return 0;
1341 }
1342
1343 static int get_option_gid(substring_t args[], kgid_t *result)
1344 {
1345         unsigned long value;
1346         kgid_t gid;
1347         int rc;
1348
1349         rc = get_option_ul(args, &value);
1350         if (rc)
1351                 return rc;
1352
1353         gid = make_kgid(current_user_ns(), value);
1354         if (!gid_valid(gid))
1355                 return -EINVAL;
1356
1357         *result = gid;
1358         return 0;
1359 }
1360
1361 static int cifs_parse_security_flavors(char *value,
1362                                        struct smb_vol *vol)
1363 {
1364
1365         substring_t args[MAX_OPT_ARGS];
1366
1367         /*
1368          * With mount options, the last one should win. Reset any existing
1369          * settings back to default.
1370          */
1371         vol->sectype = Unspecified;
1372         vol->sign = false;
1373
1374         switch (match_token(value, cifs_secflavor_tokens, args)) {
1375         case Opt_sec_krb5p:
1376                 cifs_dbg(VFS, "sec=krb5p is not supported!\n");
1377                 return 1;
1378         case Opt_sec_krb5i:
1379                 vol->sign = true;
1380                 /* Fallthrough */
1381         case Opt_sec_krb5:
1382                 vol->sectype = Kerberos;
1383                 break;
1384         case Opt_sec_ntlmsspi:
1385                 vol->sign = true;
1386                 /* Fallthrough */
1387         case Opt_sec_ntlmssp:
1388                 vol->sectype = RawNTLMSSP;
1389                 break;
1390         case Opt_sec_ntlmi:
1391                 vol->sign = true;
1392                 /* Fallthrough */
1393         case Opt_ntlm:
1394                 vol->sectype = NTLM;
1395                 break;
1396         case Opt_sec_ntlmv2i:
1397                 vol->sign = true;
1398                 /* Fallthrough */
1399         case Opt_sec_ntlmv2:
1400                 vol->sectype = NTLMv2;
1401                 break;
1402 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1403         case Opt_sec_lanman:
1404                 vol->sectype = LANMAN;
1405                 break;
1406 #endif
1407         case Opt_sec_none:
1408                 vol->nullauth = 1;
1409                 break;
1410         default:
1411                 cifs_dbg(VFS, "bad security option: %s\n", value);
1412                 return 1;
1413         }
1414
1415         return 0;
1416 }
1417
1418 static int
1419 cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
1420 {
1421         substring_t args[MAX_OPT_ARGS];
1422
1423         switch (match_token(value, cifs_cacheflavor_tokens, args)) {
1424         case Opt_cache_loose:
1425                 vol->direct_io = false;
1426                 vol->strict_io = false;
1427                 vol->cache_ro = false;
1428                 vol->cache_rw = false;
1429                 break;
1430         case Opt_cache_strict:
1431                 vol->direct_io = false;
1432                 vol->strict_io = true;
1433                 vol->cache_ro = false;
1434                 vol->cache_rw = false;
1435                 break;
1436         case Opt_cache_none:
1437                 vol->direct_io = true;
1438                 vol->strict_io = false;
1439                 vol->cache_ro = false;
1440                 vol->cache_rw = false;
1441                 break;
1442         case Opt_cache_ro:
1443                 vol->direct_io = false;
1444                 vol->strict_io = false;
1445                 vol->cache_ro = true;
1446                 vol->cache_rw = false;
1447                 break;
1448         case Opt_cache_rw:
1449                 vol->direct_io = false;
1450                 vol->strict_io = false;
1451                 vol->cache_ro = false;
1452                 vol->cache_rw = true;
1453                 break;
1454         default:
1455                 cifs_dbg(VFS, "bad cache= option: %s\n", value);
1456                 return 1;
1457         }
1458         return 0;
1459 }
1460
1461 static int
1462 cifs_parse_smb_version(char *value, struct smb_vol *vol, bool is_smb3)
1463 {
1464         substring_t args[MAX_OPT_ARGS];
1465
1466         switch (match_token(value, cifs_smb_version_tokens, args)) {
1467 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
1468         case Smb_1:
1469                 if (disable_legacy_dialects) {
1470                         cifs_dbg(VFS, "mount with legacy dialect disabled\n");
1471                         return 1;
1472                 }
1473                 if (is_smb3) {
1474                         cifs_dbg(VFS, "vers=1.0 (cifs) not permitted when mounting with smb3\n");
1475                         return 1;
1476                 }
1477                 cifs_dbg(VFS, "Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers\n");
1478                 vol->ops = &smb1_operations;
1479                 vol->vals = &smb1_values;
1480                 break;
1481         case Smb_20:
1482                 if (disable_legacy_dialects) {
1483                         cifs_dbg(VFS, "mount with legacy dialect disabled\n");
1484                         return 1;
1485                 }
1486                 if (is_smb3) {
1487                         cifs_dbg(VFS, "vers=2.0 not permitted when mounting with smb3\n");
1488                         return 1;
1489                 }
1490                 vol->ops = &smb20_operations;
1491                 vol->vals = &smb20_values;
1492                 break;
1493 #else
1494         case Smb_1:
1495                 cifs_dbg(VFS, "vers=1.0 (cifs) mount not permitted when legacy dialects disabled\n");
1496                 return 1;
1497         case Smb_20:
1498                 cifs_dbg(VFS, "vers=2.0 mount not permitted when legacy dialects disabled\n");
1499                 return 1;
1500 #endif /* CIFS_ALLOW_INSECURE_LEGACY */
1501         case Smb_21:
1502                 vol->ops = &smb21_operations;
1503                 vol->vals = &smb21_values;
1504                 break;
1505         case Smb_30:
1506                 vol->ops = &smb30_operations;
1507                 vol->vals = &smb30_values;
1508                 break;
1509         case Smb_302:
1510                 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1511                 vol->vals = &smb302_values;
1512                 break;
1513         case Smb_311:
1514                 vol->ops = &smb311_operations;
1515                 vol->vals = &smb311_values;
1516                 break;
1517         case Smb_3any:
1518                 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1519                 vol->vals = &smb3any_values;
1520                 break;
1521         case Smb_default:
1522                 vol->ops = &smb30_operations; /* currently identical with 3.0 */
1523                 vol->vals = &smbdefault_values;
1524                 break;
1525         default:
1526                 cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
1527                 return 1;
1528         }
1529         return 0;
1530 }
1531
1532 /*
1533  * Parse a devname into substrings and populate the vol->UNC and vol->prepath
1534  * fields with the result. Returns 0 on success and an error otherwise.
1535  */
1536 static int
1537 cifs_parse_devname(const char *devname, struct smb_vol *vol)
1538 {
1539         char *pos;
1540         const char *delims = "/\\";
1541         size_t len;
1542
1543         if (unlikely(!devname || !*devname)) {
1544                 cifs_dbg(VFS, "Device name not specified\n");
1545                 return -EINVAL;
1546         }
1547
1548         /* make sure we have a valid UNC double delimiter prefix */
1549         len = strspn(devname, delims);
1550         if (len != 2)
1551                 return -EINVAL;
1552
1553         /* find delimiter between host and sharename */
1554         pos = strpbrk(devname + 2, delims);
1555         if (!pos)
1556                 return -EINVAL;
1557
1558         /* skip past delimiter */
1559         ++pos;
1560
1561         /* now go until next delimiter or end of string */
1562         len = strcspn(pos, delims);
1563
1564         /* move "pos" up to delimiter or NULL */
1565         pos += len;
1566         vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
1567         if (!vol->UNC)
1568                 return -ENOMEM;
1569
1570         convert_delimiter(vol->UNC, '\\');
1571
1572         /* skip any delimiter */
1573         if (*pos == '/' || *pos == '\\')
1574                 pos++;
1575
1576         /* If pos is NULL then no prepath */
1577         if (!*pos)
1578                 return 0;
1579
1580         vol->prepath = kstrdup(pos, GFP_KERNEL);
1581         if (!vol->prepath)
1582                 return -ENOMEM;
1583
1584         return 0;
1585 }
1586
1587 static int
1588 cifs_parse_mount_options(const char *mountdata, const char *devname,
1589                          struct smb_vol *vol, bool is_smb3)
1590 {
1591         char *data, *end;
1592         char *mountdata_copy = NULL, *options;
1593         unsigned int  temp_len, i, j;
1594         char separator[2];
1595         short int override_uid = -1;
1596         short int override_gid = -1;
1597         bool uid_specified = false;
1598         bool gid_specified = false;
1599         bool sloppy = false;
1600         char *invalid = NULL;
1601         char *nodename = utsname()->nodename;
1602         char *string = NULL;
1603         char *tmp_end, *value;
1604         char delim;
1605         bool got_ip = false;
1606         bool got_version = false;
1607         unsigned short port = 0;
1608         struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
1609
1610         separator[0] = ',';
1611         separator[1] = 0;
1612         delim = separator[0];
1613
1614         /* ensure we always start with zeroed-out smb_vol */
1615         memset(vol, 0, sizeof(*vol));
1616
1617         /*
1618          * does not have to be perfect mapping since field is
1619          * informational, only used for servers that do not support
1620          * port 445 and it can be overridden at mount time
1621          */
1622         memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
1623         for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
1624                 vol->source_rfc1001_name[i] = toupper(nodename[i]);
1625
1626         vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
1627         /* null target name indicates to use *SMBSERVR default called name
1628            if we end up sending RFC1001 session initialize */
1629         vol->target_rfc1001_name[0] = 0;
1630         vol->cred_uid = current_uid();
1631         vol->linux_uid = current_uid();
1632         vol->linux_gid = current_gid();
1633         vol->bsize = 1024 * 1024; /* can improve cp performance significantly */
1634         /*
1635          * default to SFM style remapping of seven reserved characters
1636          * unless user overrides it or we negotiate CIFS POSIX where
1637          * it is unnecessary.  Can not simultaneously use more than one mapping
1638          * since then readdir could list files that open could not open
1639          */
1640         vol->remap = true;
1641
1642         /* default to only allowing write access to owner of the mount */
1643         vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
1644
1645         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
1646         /* default is always to request posix paths. */
1647         vol->posix_paths = 1;
1648         /* default to using server inode numbers where available */
1649         vol->server_ino = 1;
1650
1651         /* default is to use strict cifs caching semantics */
1652         vol->strict_io = true;
1653
1654         vol->actimeo = CIFS_DEF_ACTIMEO;
1655
1656         /* Most clients set timeout to 0, allows server to use its default */
1657         vol->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */
1658
1659         /* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
1660         vol->ops = &smb30_operations;
1661         vol->vals = &smbdefault_values;
1662
1663         vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
1664
1665         /* default to no multichannel (single server connection) */
1666         vol->multichannel = false;
1667         vol->max_channels = 1;
1668
1669         if (!mountdata)
1670                 goto cifs_parse_mount_err;
1671
1672         mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
1673         if (!mountdata_copy)
1674                 goto cifs_parse_mount_err;
1675
1676         options = mountdata_copy;
1677         end = options + strlen(options);
1678
1679         if (strncmp(options, "sep=", 4) == 0) {
1680                 if (options[4] != 0) {
1681                         separator[0] = options[4];
1682                         options += 5;
1683                 } else {
1684                         cifs_dbg(FYI, "Null separator not allowed\n");
1685                 }
1686         }
1687         vol->backupuid_specified = false; /* no backup intent for a user */
1688         vol->backupgid_specified = false; /* no backup intent for a group */
1689
1690         switch (cifs_parse_devname(devname, vol)) {
1691         case 0:
1692                 break;
1693         case -ENOMEM:
1694                 cifs_dbg(VFS, "Unable to allocate memory for devname\n");
1695                 goto cifs_parse_mount_err;
1696         case -EINVAL:
1697                 cifs_dbg(VFS, "Malformed UNC in devname\n");
1698                 goto cifs_parse_mount_err;
1699         default:
1700                 cifs_dbg(VFS, "Unknown error parsing devname\n");
1701                 goto cifs_parse_mount_err;
1702         }
1703
1704         while ((data = strsep(&options, separator)) != NULL) {
1705                 substring_t args[MAX_OPT_ARGS];
1706                 unsigned long option;
1707                 int token;
1708
1709                 if (!*data)
1710                         continue;
1711
1712                 token = match_token(data, cifs_mount_option_tokens, args);
1713
1714                 switch (token) {
1715
1716                 /* Ingnore the following */
1717                 case Opt_ignore:
1718                         break;
1719
1720                 /* Boolean values */
1721                 case Opt_user_xattr:
1722                         vol->no_xattr = 0;
1723                         break;
1724                 case Opt_nouser_xattr:
1725                         vol->no_xattr = 1;
1726                         break;
1727                 case Opt_forceuid:
1728                         override_uid = 1;
1729                         break;
1730                 case Opt_noforceuid:
1731                         override_uid = 0;
1732                         break;
1733                 case Opt_forcegid:
1734                         override_gid = 1;
1735                         break;
1736                 case Opt_noforcegid:
1737                         override_gid = 0;
1738                         break;
1739                 case Opt_noblocksend:
1740                         vol->noblocksnd = 1;
1741                         break;
1742                 case Opt_noautotune:
1743                         vol->noautotune = 1;
1744                         break;
1745                 case Opt_nolease:
1746                         vol->no_lease = 1;
1747                         break;
1748                 case Opt_hard:
1749                         vol->retry = 1;
1750                         break;
1751                 case Opt_soft:
1752                         vol->retry = 0;
1753                         break;
1754                 case Opt_perm:
1755                         vol->noperm = 0;
1756                         break;
1757                 case Opt_noperm:
1758                         vol->noperm = 1;
1759                         break;
1760                 case Opt_nodelete:
1761                         vol->nodelete = 1;
1762                         break;
1763                 case Opt_mapchars:
1764                         vol->sfu_remap = true;
1765                         vol->remap = false; /* disable SFM mapping */
1766                         break;
1767                 case Opt_nomapchars:
1768                         vol->sfu_remap = false;
1769                         break;
1770                 case Opt_mapposix:
1771                         vol->remap = true;
1772                         vol->sfu_remap = false; /* disable SFU mapping */
1773                         break;
1774                 case Opt_nomapposix:
1775                         vol->remap = false;
1776                         break;
1777                 case Opt_sfu:
1778                         vol->sfu_emul = 1;
1779                         break;
1780                 case Opt_nosfu:
1781                         vol->sfu_emul = 0;
1782                         break;
1783                 case Opt_nodfs:
1784                         vol->nodfs = 1;
1785                         break;
1786                 case Opt_rootfs:
1787 #ifdef CONFIG_CIFS_ROOT
1788                         vol->rootfs = true;
1789 #endif
1790                         break;
1791                 case Opt_posixpaths:
1792                         vol->posix_paths = 1;
1793                         break;
1794                 case Opt_noposixpaths:
1795                         vol->posix_paths = 0;
1796                         break;
1797                 case Opt_nounix:
1798                         if (vol->linux_ext)
1799                                 cifs_dbg(VFS,
1800                                         "conflicting unix mount options\n");
1801                         vol->no_linux_ext = 1;
1802                         break;
1803                 case Opt_unix:
1804                         if (vol->no_linux_ext)
1805                                 cifs_dbg(VFS,
1806                                         "conflicting unix mount options\n");
1807                         vol->linux_ext = 1;
1808                         break;
1809                 case Opt_nocase:
1810                         vol->nocase = 1;
1811                         break;
1812                 case Opt_brl:
1813                         vol->nobrl =  0;
1814                         break;
1815                 case Opt_nobrl:
1816                         vol->nobrl =  1;
1817                         /*
1818                          * turn off mandatory locking in mode
1819                          * if remote locking is turned off since the
1820                          * local vfs will do advisory
1821                          */
1822                         if (vol->file_mode ==
1823                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1824                                 vol->file_mode = S_IALLUGO;
1825                         break;
1826                 case Opt_nohandlecache:
1827                         vol->nohandlecache = 1;
1828                         break;
1829                 case Opt_handlecache:
1830                         vol->nohandlecache = 0;
1831                         break;
1832                 case Opt_forcemandatorylock:
1833                         vol->mand_lock = 1;
1834                         break;
1835                 case Opt_setuids:
1836                         vol->setuids = 1;
1837                         break;
1838                 case Opt_nosetuids:
1839                         vol->setuids = 0;
1840                         break;
1841                 case Opt_setuidfromacl:
1842                         vol->setuidfromacl = 1;
1843                         break;
1844                 case Opt_dynperm:
1845                         vol->dynperm = true;
1846                         break;
1847                 case Opt_nodynperm:
1848                         vol->dynperm = false;
1849                         break;
1850                 case Opt_nohard:
1851                         vol->retry = 0;
1852                         break;
1853                 case Opt_nosoft:
1854                         vol->retry = 1;
1855                         break;
1856                 case Opt_nointr:
1857                         vol->intr = 0;
1858                         break;
1859                 case Opt_intr:
1860                         vol->intr = 1;
1861                         break;
1862                 case Opt_nostrictsync:
1863                         vol->nostrictsync = 1;
1864                         break;
1865                 case Opt_strictsync:
1866                         vol->nostrictsync = 0;
1867                         break;
1868                 case Opt_serverino:
1869                         vol->server_ino = 1;
1870                         break;
1871                 case Opt_noserverino:
1872                         vol->server_ino = 0;
1873                         break;
1874                 case Opt_rwpidforward:
1875                         vol->rwpidforward = 1;
1876                         break;
1877                 case Opt_modesid:
1878                         vol->mode_ace = 1;
1879                         break;
1880                 case Opt_cifsacl:
1881                         vol->cifs_acl = 1;
1882                         break;
1883                 case Opt_nocifsacl:
1884                         vol->cifs_acl = 0;
1885                         break;
1886                 case Opt_acl:
1887                         vol->no_psx_acl = 0;
1888                         break;
1889                 case Opt_noacl:
1890                         vol->no_psx_acl = 1;
1891                         break;
1892                 case Opt_locallease:
1893                         vol->local_lease = 1;
1894                         break;
1895                 case Opt_sign:
1896                         vol->sign = true;
1897                         break;
1898                 case Opt_ignore_signature:
1899                         vol->sign = true;
1900                         vol->ignore_signature = true;
1901                         break;
1902                 case Opt_seal:
1903                         /* we do not do the following in secFlags because seal
1904                          * is a per tree connection (mount) not a per socket
1905                          * or per-smb connection option in the protocol
1906                          * vol->secFlg |= CIFSSEC_MUST_SEAL;
1907                          */
1908                         vol->seal = 1;
1909                         break;
1910                 case Opt_noac:
1911                         pr_warn("Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
1912                         break;
1913                 case Opt_fsc:
1914 #ifndef CONFIG_CIFS_FSCACHE
1915                         cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
1916                         goto cifs_parse_mount_err;
1917 #endif
1918                         vol->fsc = true;
1919                         break;
1920                 case Opt_mfsymlinks:
1921                         vol->mfsymlinks = true;
1922                         break;
1923                 case Opt_multiuser:
1924                         vol->multiuser = true;
1925                         break;
1926                 case Opt_sloppy:
1927                         sloppy = true;
1928                         break;
1929                 case Opt_nosharesock:
1930                         vol->nosharesock = true;
1931                         break;
1932                 case Opt_nopersistent:
1933                         vol->nopersistent = true;
1934                         if (vol->persistent) {
1935                                 cifs_dbg(VFS,
1936                                   "persistenthandles mount options conflict\n");
1937                                 goto cifs_parse_mount_err;
1938                         }
1939                         break;
1940                 case Opt_persistent:
1941                         vol->persistent = true;
1942                         if ((vol->nopersistent) || (vol->resilient)) {
1943                                 cifs_dbg(VFS,
1944                                   "persistenthandles mount options conflict\n");
1945                                 goto cifs_parse_mount_err;
1946                         }
1947                         break;
1948                 case Opt_resilient:
1949                         vol->resilient = true;
1950                         if (vol->persistent) {
1951                                 cifs_dbg(VFS,
1952                                   "persistenthandles mount options conflict\n");
1953                                 goto cifs_parse_mount_err;
1954                         }
1955                         break;
1956                 case Opt_noresilient:
1957                         vol->resilient = false; /* already the default */
1958                         break;
1959                 case Opt_domainauto:
1960                         vol->domainauto = true;
1961                         break;
1962                 case Opt_rdma:
1963                         vol->rdma = true;
1964                         break;
1965                 case Opt_multichannel:
1966                         vol->multichannel = true;
1967                         /* if number of channels not specified, default to 2 */
1968                         if (vol->max_channels < 2)
1969                                 vol->max_channels = 2;
1970                         break;
1971                 case Opt_nomultichannel:
1972                         vol->multichannel = false;
1973                         vol->max_channels = 1;
1974                         break;
1975                 case Opt_compress:
1976                         vol->compression = UNKNOWN_TYPE;
1977                         cifs_dbg(VFS,
1978                                 "SMB3 compression support is experimental\n");
1979                         break;
1980
1981                 /* Numeric Values */
1982                 case Opt_backupuid:
1983                         if (get_option_uid(args, &vol->backupuid)) {
1984                                 cifs_dbg(VFS, "%s: Invalid backupuid value\n",
1985                                          __func__);
1986                                 goto cifs_parse_mount_err;
1987                         }
1988                         vol->backupuid_specified = true;
1989                         break;
1990                 case Opt_backupgid:
1991                         if (get_option_gid(args, &vol->backupgid)) {
1992                                 cifs_dbg(VFS, "%s: Invalid backupgid value\n",
1993                                          __func__);
1994                                 goto cifs_parse_mount_err;
1995                         }
1996                         vol->backupgid_specified = true;
1997                         break;
1998                 case Opt_uid:
1999                         if (get_option_uid(args, &vol->linux_uid)) {
2000                                 cifs_dbg(VFS, "%s: Invalid uid value\n",
2001                                          __func__);
2002                                 goto cifs_parse_mount_err;
2003                         }
2004                         uid_specified = true;
2005                         break;
2006                 case Opt_cruid:
2007                         if (get_option_uid(args, &vol->cred_uid)) {
2008                                 cifs_dbg(VFS, "%s: Invalid cruid value\n",
2009                                          __func__);
2010                                 goto cifs_parse_mount_err;
2011                         }
2012                         break;
2013                 case Opt_gid:
2014                         if (get_option_gid(args, &vol->linux_gid)) {
2015                                 cifs_dbg(VFS, "%s: Invalid gid value\n",
2016                                          __func__);
2017                                 goto cifs_parse_mount_err;
2018                         }
2019                         gid_specified = true;
2020                         break;
2021                 case Opt_file_mode:
2022                         if (get_option_ul(args, &option)) {
2023                                 cifs_dbg(VFS, "%s: Invalid file_mode value\n",
2024                                          __func__);
2025                                 goto cifs_parse_mount_err;
2026                         }
2027                         vol->file_mode = option;
2028                         break;
2029                 case Opt_dirmode:
2030                         if (get_option_ul(args, &option)) {
2031                                 cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
2032                                          __func__);
2033                                 goto cifs_parse_mount_err;
2034                         }
2035                         vol->dir_mode = option;
2036                         break;
2037                 case Opt_port:
2038                         if (get_option_ul(args, &option) ||
2039                             option > USHRT_MAX) {
2040                                 cifs_dbg(VFS, "%s: Invalid port value\n",
2041                                          __func__);
2042                                 goto cifs_parse_mount_err;
2043                         }
2044                         port = (unsigned short)option;
2045                         break;
2046                 case Opt_min_enc_offload:
2047                         if (get_option_ul(args, &option)) {
2048                                 cifs_dbg(VFS, "Invalid minimum encrypted read offload size (esize)\n");
2049                                 goto cifs_parse_mount_err;
2050                         }
2051                         vol->min_offload = option;
2052                         break;
2053                 case Opt_blocksize:
2054                         if (get_option_ul(args, &option)) {
2055                                 cifs_dbg(VFS, "%s: Invalid blocksize value\n",
2056                                         __func__);
2057                                 goto cifs_parse_mount_err;
2058                         }
2059                         /*
2060                          * inode blocksize realistically should never need to be
2061                          * less than 16K or greater than 16M and default is 1MB.
2062                          * Note that small inode block sizes (e.g. 64K) can lead
2063                          * to very poor performance of common tools like cp and scp
2064                          */
2065                         if ((option < CIFS_MAX_MSGSIZE) ||
2066                            (option > (4 * SMB3_DEFAULT_IOSIZE))) {
2067                                 cifs_dbg(VFS, "%s: Invalid blocksize\n",
2068                                         __func__);
2069                                 goto cifs_parse_mount_err;
2070                         }
2071                         vol->bsize = option;
2072                         break;
2073                 case Opt_rsize:
2074                         if (get_option_ul(args, &option)) {
2075                                 cifs_dbg(VFS, "%s: Invalid rsize value\n",
2076                                          __func__);
2077                                 goto cifs_parse_mount_err;
2078                         }
2079                         vol->rsize = option;
2080                         break;
2081                 case Opt_wsize:
2082                         if (get_option_ul(args, &option)) {
2083                                 cifs_dbg(VFS, "%s: Invalid wsize value\n",
2084                                          __func__);
2085                                 goto cifs_parse_mount_err;
2086                         }
2087                         vol->wsize = option;
2088                         break;
2089                 case Opt_actimeo:
2090                         if (get_option_ul(args, &option)) {
2091                                 cifs_dbg(VFS, "%s: Invalid actimeo value\n",
2092                                          __func__);
2093                                 goto cifs_parse_mount_err;
2094                         }
2095                         vol->actimeo = HZ * option;
2096                         if (vol->actimeo > CIFS_MAX_ACTIMEO) {
2097                                 cifs_dbg(VFS, "attribute cache timeout too large\n");
2098                                 goto cifs_parse_mount_err;
2099                         }
2100                         break;
2101                 case Opt_handletimeout:
2102                         if (get_option_ul(args, &option)) {
2103                                 cifs_dbg(VFS, "%s: Invalid handletimeout value\n",
2104                                          __func__);
2105                                 goto cifs_parse_mount_err;
2106                         }
2107                         vol->handle_timeout = option;
2108                         if (vol->handle_timeout > SMB3_MAX_HANDLE_TIMEOUT) {
2109                                 cifs_dbg(VFS, "Invalid handle cache timeout, longer than 16 minutes\n");
2110                                 goto cifs_parse_mount_err;
2111                         }
2112                         break;
2113                 case Opt_echo_interval:
2114                         if (get_option_ul(args, &option)) {
2115                                 cifs_dbg(VFS, "%s: Invalid echo interval value\n",
2116                                          __func__);
2117                                 goto cifs_parse_mount_err;
2118                         }
2119                         vol->echo_interval = option;
2120                         break;
2121                 case Opt_snapshot:
2122                         if (get_option_ul(args, &option)) {
2123                                 cifs_dbg(VFS, "%s: Invalid snapshot time\n",
2124                                          __func__);
2125                                 goto cifs_parse_mount_err;
2126                         }
2127                         vol->snapshot_time = option;
2128                         break;
2129                 case Opt_max_credits:
2130                         if (get_option_ul(args, &option) || (option < 20) ||
2131                             (option > 60000)) {
2132                                 cifs_dbg(VFS, "%s: Invalid max_credits value\n",
2133                                          __func__);
2134                                 goto cifs_parse_mount_err;
2135                         }
2136                         vol->max_credits = option;
2137                         break;
2138                 case Opt_max_channels:
2139                         if (get_option_ul(args, &option) || option < 1 ||
2140                                 option > CIFS_MAX_CHANNELS) {
2141                                 cifs_dbg(VFS, "%s: Invalid max_channels value, needs to be 1-%d\n",
2142                                          __func__, CIFS_MAX_CHANNELS);
2143                                 goto cifs_parse_mount_err;
2144                         }
2145                         vol->max_channels = option;
2146                         break;
2147
2148                 /* String Arguments */
2149
2150                 case Opt_blank_user:
2151                         /* null user, ie. anonymous authentication */
2152                         vol->nullauth = 1;
2153                         vol->username = NULL;
2154                         break;
2155                 case Opt_user:
2156                         string = match_strdup(args);
2157                         if (string == NULL)
2158                                 goto out_nomem;
2159
2160                         if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
2161                                                         CIFS_MAX_USERNAME_LEN) {
2162                                 pr_warn("username too long\n");
2163                                 goto cifs_parse_mount_err;
2164                         }
2165
2166                         kfree(vol->username);
2167                         vol->username = kstrdup(string, GFP_KERNEL);
2168                         if (!vol->username)
2169                                 goto cifs_parse_mount_err;
2170                         break;
2171                 case Opt_blank_pass:
2172                         /* passwords have to be handled differently
2173                          * to allow the character used for deliminator
2174                          * to be passed within them
2175                          */
2176
2177                         /*
2178                          * Check if this is a case where the  password
2179                          * starts with a delimiter
2180                          */
2181                         tmp_end = strchr(data, '=');
2182                         tmp_end++;
2183                         if (!(tmp_end < end && tmp_end[1] == delim)) {
2184                                 /* No it is not. Set the password to NULL */
2185                                 kzfree(vol->password);
2186                                 vol->password = NULL;
2187                                 break;
2188                         }
2189                         /* Fallthrough - to Opt_pass below.*/
2190                 case Opt_pass:
2191                         /* Obtain the value string */
2192                         value = strchr(data, '=');
2193                         value++;
2194
2195                         /* Set tmp_end to end of the string */
2196                         tmp_end = (char *) value + strlen(value);
2197
2198                         /* Check if following character is the deliminator
2199                          * If yes, we have encountered a double deliminator
2200                          * reset the NULL character to the deliminator
2201                          */
2202                         if (tmp_end < end && tmp_end[1] == delim) {
2203                                 tmp_end[0] = delim;
2204
2205                                 /* Keep iterating until we get to a single
2206                                  * deliminator OR the end
2207                                  */
2208                                 while ((tmp_end = strchr(tmp_end, delim))
2209                                         != NULL && (tmp_end[1] == delim)) {
2210                                                 tmp_end = (char *) &tmp_end[2];
2211                                 }
2212
2213                                 /* Reset var options to point to next element */
2214                                 if (tmp_end) {
2215                                         tmp_end[0] = '\0';
2216                                         options = (char *) &tmp_end[1];
2217                                 } else
2218                                         /* Reached the end of the mount option
2219                                          * string */
2220                                         options = end;
2221                         }
2222
2223                         kzfree(vol->password);
2224                         /* Now build new password string */
2225                         temp_len = strlen(value);
2226                         vol->password = kzalloc(temp_len+1, GFP_KERNEL);
2227                         if (vol->password == NULL) {
2228                                 pr_warn("no memory for password\n");
2229                                 goto cifs_parse_mount_err;
2230                         }
2231
2232                         for (i = 0, j = 0; i < temp_len; i++, j++) {
2233                                 vol->password[j] = value[i];
2234                                 if ((value[i] == delim) &&
2235                                      value[i+1] == delim)
2236                                         /* skip the second deliminator */
2237                                         i++;
2238                         }
2239                         vol->password[j] = '\0';
2240                         break;
2241                 case Opt_blank_ip:
2242                         /* FIXME: should this be an error instead? */
2243                         got_ip = false;
2244                         break;
2245                 case Opt_ip:
2246                         string = match_strdup(args);
2247                         if (string == NULL)
2248                                 goto out_nomem;
2249
2250                         if (!cifs_convert_address(dstaddr, string,
2251                                         strlen(string))) {
2252                                 pr_err("bad ip= option (%s)\n", string);
2253                                 goto cifs_parse_mount_err;
2254                         }
2255                         got_ip = true;
2256                         break;
2257                 case Opt_domain:
2258                         string = match_strdup(args);
2259                         if (string == NULL)
2260                                 goto out_nomem;
2261
2262                         if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
2263                                         == CIFS_MAX_DOMAINNAME_LEN) {
2264                                 pr_warn("domain name too long\n");
2265                                 goto cifs_parse_mount_err;
2266                         }
2267
2268                         kfree(vol->domainname);
2269                         vol->domainname = kstrdup(string, GFP_KERNEL);
2270                         if (!vol->domainname) {
2271                                 pr_warn("no memory for domainname\n");
2272                                 goto cifs_parse_mount_err;
2273                         }
2274                         cifs_dbg(FYI, "Domain name set\n");
2275                         break;
2276                 case Opt_srcaddr:
2277                         string = match_strdup(args);
2278                         if (string == NULL)
2279                                 goto out_nomem;
2280
2281                         if (!cifs_convert_address(
2282                                         (struct sockaddr *)&vol->srcaddr,
2283                                         string, strlen(string))) {
2284                                 pr_warn("Could not parse srcaddr: %s\n",
2285                                         string);
2286                                 goto cifs_parse_mount_err;
2287                         }
2288                         break;
2289                 case Opt_iocharset:
2290                         string = match_strdup(args);
2291                         if (string == NULL)
2292                                 goto out_nomem;
2293
2294                         if (strnlen(string, 1024) >= 65) {
2295                                 pr_warn("iocharset name too long\n");
2296                                 goto cifs_parse_mount_err;
2297                         }
2298
2299                          if (strncasecmp(string, "default", 7) != 0) {
2300                                 kfree(vol->iocharset);
2301                                 vol->iocharset = kstrdup(string,
2302                                                          GFP_KERNEL);
2303                                 if (!vol->iocharset) {
2304                                         pr_warn("no memory for charset\n");
2305                                         goto cifs_parse_mount_err;
2306                                 }
2307                         }
2308                         /* if iocharset not set then load_nls_default
2309                          * is used by caller
2310                          */
2311                          cifs_dbg(FYI, "iocharset set to %s\n", string);
2312                         break;
2313                 case Opt_netbiosname:
2314                         string = match_strdup(args);
2315                         if (string == NULL)
2316                                 goto out_nomem;
2317
2318                         memset(vol->source_rfc1001_name, 0x20,
2319                                 RFC1001_NAME_LEN);
2320                         /*
2321                          * FIXME: are there cases in which a comma can
2322                          * be valid in workstation netbios name (and
2323                          * need special handling)?
2324                          */
2325                         for (i = 0; i < RFC1001_NAME_LEN; i++) {
2326                                 /* don't ucase netbiosname for user */
2327                                 if (string[i] == 0)
2328                                         break;
2329                                 vol->source_rfc1001_name[i] = string[i];
2330                         }
2331                         /* The string has 16th byte zero still from
2332                          * set at top of the function
2333                          */
2334                         if (i == RFC1001_NAME_LEN && string[i] != 0)
2335                                 pr_warn("netbiosname longer than 15 truncated\n");
2336                         break;
2337                 case Opt_servern:
2338                         /* servernetbiosname specified override *SMBSERVER */
2339                         string = match_strdup(args);
2340                         if (string == NULL)
2341                                 goto out_nomem;
2342
2343                         /* last byte, type, is 0x20 for servr type */
2344                         memset(vol->target_rfc1001_name, 0x20,
2345                                 RFC1001_NAME_LEN_WITH_NULL);
2346
2347                         /* BB are there cases in which a comma can be
2348                            valid in this workstation netbios name
2349                            (and need special handling)? */
2350
2351                         /* user or mount helper must uppercase the
2352                            netbios name */
2353                         for (i = 0; i < 15; i++) {
2354                                 if (string[i] == 0)
2355                                         break;
2356                                 vol->target_rfc1001_name[i] = string[i];
2357                         }
2358                         /* The string has 16th byte zero still from
2359                            set at top of the function  */
2360                         if (i == RFC1001_NAME_LEN && string[i] != 0)
2361                                 pr_warn("server netbiosname longer than 15 truncated\n");
2362                         break;
2363                 case Opt_ver:
2364                         /* version of mount userspace tools, not dialect */
2365                         string = match_strdup(args);
2366                         if (string == NULL)
2367                                 goto out_nomem;
2368
2369                         /* If interface changes in mount.cifs bump to new ver */
2370                         if (strncasecmp(string, "1", 1) == 0) {
2371                                 if (strlen(string) > 1) {
2372                                         pr_warn("Bad mount helper ver=%s. Did you want SMB1 (CIFS) dialect and mean to type vers=1.0 instead?\n",
2373                                                 string);
2374                                         goto cifs_parse_mount_err;
2375                                 }
2376                                 /* This is the default */
2377                                 break;
2378                         }
2379                         /* For all other value, error */
2380                         pr_warn("Invalid mount helper version specified\n");
2381                         goto cifs_parse_mount_err;
2382                 case Opt_vers:
2383                         /* protocol version (dialect) */
2384                         string = match_strdup(args);
2385                         if (string == NULL)
2386                                 goto out_nomem;
2387
2388                         if (cifs_parse_smb_version(string, vol, is_smb3) != 0)
2389                                 goto cifs_parse_mount_err;
2390                         got_version = true;
2391                         break;
2392                 case Opt_sec:
2393                         string = match_strdup(args);
2394                         if (string == NULL)
2395                                 goto out_nomem;
2396
2397                         if (cifs_parse_security_flavors(string, vol) != 0)
2398                                 goto cifs_parse_mount_err;
2399                         break;
2400                 case Opt_cache:
2401                         string = match_strdup(args);
2402                         if (string == NULL)
2403                                 goto out_nomem;
2404
2405                         if (cifs_parse_cache_flavor(string, vol) != 0)
2406                                 goto cifs_parse_mount_err;
2407                         break;
2408                 default:
2409                         /*
2410                          * An option we don't recognize. Save it off for later
2411                          * if we haven't already found one
2412                          */
2413                         if (!invalid)
2414                                 invalid = data;
2415                         break;
2416                 }
2417                 /* Free up any allocated string */
2418                 kfree(string);
2419                 string = NULL;
2420         }
2421
2422         if (!sloppy && invalid) {
2423                 pr_err("Unknown mount option \"%s\"\n", invalid);
2424                 goto cifs_parse_mount_err;
2425         }
2426
2427         if (vol->rdma && vol->vals->protocol_id < SMB30_PROT_ID) {
2428                 cifs_dbg(VFS, "SMB Direct requires Version >=3.0\n");
2429                 goto cifs_parse_mount_err;
2430         }
2431
2432 #ifndef CONFIG_KEYS
2433         /* Muliuser mounts require CONFIG_KEYS support */
2434         if (vol->multiuser) {
2435                 cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
2436                 goto cifs_parse_mount_err;
2437         }
2438 #endif
2439         if (!vol->UNC) {
2440                 cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
2441                 goto cifs_parse_mount_err;
2442         }
2443
2444         /* make sure UNC has a share name */
2445         if (!strchr(vol->UNC + 3, '\\')) {
2446                 cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
2447                 goto cifs_parse_mount_err;
2448         }
2449
2450         if (!got_ip) {
2451                 int len;
2452                 const char *slash;
2453
2454                 /* No ip= option specified? Try to get it from UNC */
2455                 /* Use the address part of the UNC. */
2456                 slash = strchr(&vol->UNC[2], '\\');
2457                 len = slash - &vol->UNC[2];
2458                 if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
2459                         pr_err("Unable to determine destination address\n");
2460                         goto cifs_parse_mount_err;
2461                 }
2462         }
2463
2464         /* set the port that we got earlier */
2465         cifs_set_port(dstaddr, port);
2466
2467         if (uid_specified)
2468                 vol->override_uid = override_uid;
2469         else if (override_uid == 1)
2470                 pr_notice("ignoring forceuid mount option specified with no uid= option\n");
2471
2472         if (gid_specified)
2473                 vol->override_gid = override_gid;
2474         else if (override_gid == 1)
2475                 pr_notice("ignoring forcegid mount option specified with no gid= option\n");
2476
2477         if (got_version == false)
2478                 pr_warn_once("No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3.1.1), from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3.1.1 (or even SMB3 or SMB2.1) specify vers=1.0 on mount.\n");
2479
2480         kfree(mountdata_copy);
2481         return 0;
2482
2483 out_nomem:
2484         pr_warn("Could not allocate temporary buffer\n");
2485 cifs_parse_mount_err:
2486         kfree(string);
2487         kfree(mountdata_copy);
2488         return 1;
2489 }
2490
2491 /** Returns true if srcaddr isn't specified and rhs isn't
2492  * specified, or if srcaddr is specified and
2493  * matches the IP address of the rhs argument.
2494  */
2495 bool
2496 cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs)
2497 {
2498         switch (srcaddr->sa_family) {
2499         case AF_UNSPEC:
2500                 return (rhs->sa_family == AF_UNSPEC);
2501         case AF_INET: {
2502                 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
2503                 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
2504                 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
2505         }
2506         case AF_INET6: {
2507                 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
2508                 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
2509                 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
2510         }
2511         default:
2512                 WARN_ON(1);
2513                 return false; /* don't expect to be here */
2514         }
2515 }
2516
2517 /*
2518  * If no port is specified in addr structure, we try to match with 445 port
2519  * and if it fails - with 139 ports. It should be called only if address
2520  * families of server and addr are equal.
2521  */
2522 static bool
2523 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
2524 {
2525         __be16 port, *sport;
2526
2527         /* SMBDirect manages its own ports, don't match it here */
2528         if (server->rdma)
2529                 return true;
2530
2531         switch (addr->sa_family) {
2532         case AF_INET:
2533                 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
2534                 port = ((struct sockaddr_in *) addr)->sin_port;
2535                 break;
2536         case AF_INET6:
2537                 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
2538                 port = ((struct sockaddr_in6 *) addr)->sin6_port;
2539                 break;
2540         default:
2541                 WARN_ON(1);
2542                 return false;
2543         }
2544
2545         if (!port) {
2546                 port = htons(CIFS_PORT);
2547                 if (port == *sport)
2548                         return true;
2549
2550                 port = htons(RFC1001_PORT);
2551         }
2552
2553         return port == *sport;
2554 }
2555
2556 static bool
2557 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
2558               struct sockaddr *srcaddr)
2559 {
2560         switch (addr->sa_family) {
2561         case AF_INET: {
2562                 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
2563                 struct sockaddr_in *srv_addr4 =
2564                                         (struct sockaddr_in *)&server->dstaddr;
2565
2566                 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
2567                         return false;
2568                 break;
2569         }
2570         case AF_INET6: {
2571                 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
2572                 struct sockaddr_in6 *srv_addr6 =
2573                                         (struct sockaddr_in6 *)&server->dstaddr;
2574
2575                 if (!ipv6_addr_equal(&addr6->sin6_addr,
2576                                      &srv_addr6->sin6_addr))
2577                         return false;
2578                 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
2579                         return false;
2580                 break;
2581         }
2582         default:
2583                 WARN_ON(1);
2584                 return false; /* don't expect to be here */
2585         }
2586
2587         if (!cifs_match_ipaddr(srcaddr, (struct sockaddr *)&server->srcaddr))
2588                 return false;
2589
2590         return true;
2591 }
2592
2593 static bool
2594 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
2595 {
2596         /*
2597          * The select_sectype function should either return the vol->sectype
2598          * that was specified, or "Unspecified" if that sectype was not
2599          * compatible with the given NEGOTIATE request.
2600          */
2601         if (server->ops->select_sectype(server, vol->sectype)
2602              == Unspecified)
2603                 return false;
2604
2605         /*
2606          * Now check if signing mode is acceptable. No need to check
2607          * global_secflags at this point since if MUST_SIGN is set then
2608          * the server->sign had better be too.
2609          */
2610         if (vol->sign && !server->sign)
2611                 return false;
2612
2613         return true;
2614 }
2615
2616 static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
2617 {
2618         struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
2619
2620         if (vol->nosharesock)
2621                 return 0;
2622
2623         /* If multidialect negotiation see if existing sessions match one */
2624         if (strcmp(vol->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
2625                 if (server->vals->protocol_id < SMB30_PROT_ID)
2626                         return 0;
2627         } else if (strcmp(vol->vals->version_string,
2628                    SMBDEFAULT_VERSION_STRING) == 0) {
2629                 if (server->vals->protocol_id < SMB21_PROT_ID)
2630                         return 0;
2631         } else if ((server->vals != vol->vals) || (server->ops != vol->ops))
2632                 return 0;
2633
2634         if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
2635                 return 0;
2636
2637         if (!match_address(server, addr,
2638                            (struct sockaddr *)&vol->srcaddr))
2639                 return 0;
2640
2641         if (!match_port(server, addr))
2642                 return 0;
2643
2644         if (!match_security(server, vol))
2645                 return 0;
2646
2647         if (server->echo_interval != vol->echo_interval * HZ)
2648                 return 0;
2649
2650         if (server->rdma != vol->rdma)
2651                 return 0;
2652
2653         if (server->ignore_signature != vol->ignore_signature)
2654                 return 0;
2655
2656         if (server->min_offload != vol->min_offload)
2657                 return 0;
2658
2659         return 1;
2660 }
2661
2662 struct TCP_Server_Info *
2663 cifs_find_tcp_session(struct smb_vol *vol)
2664 {
2665         struct TCP_Server_Info *server;
2666
2667         spin_lock(&cifs_tcp_ses_lock);
2668         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
2669                 /*
2670                  * Skip ses channels since they're only handled in lower layers
2671                  * (e.g. cifs_send_recv).
2672                  */
2673                 if (server->is_channel || !match_server(server, vol))
2674                         continue;
2675
2676                 ++server->srv_count;
2677                 spin_unlock(&cifs_tcp_ses_lock);
2678                 cifs_dbg(FYI, "Existing tcp session with server found\n");
2679                 return server;
2680         }
2681         spin_unlock(&cifs_tcp_ses_lock);
2682         return NULL;
2683 }
2684
2685 void
2686 cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
2687 {
2688         struct task_struct *task;
2689
2690         spin_lock(&cifs_tcp_ses_lock);
2691         if (--server->srv_count > 0) {
2692                 spin_unlock(&cifs_tcp_ses_lock);
2693                 return;
2694         }
2695
2696         put_net(cifs_net_ns(server));
2697
2698         list_del_init(&server->tcp_ses_list);
2699         spin_unlock(&cifs_tcp_ses_lock);
2700
2701         cancel_delayed_work_sync(&server->echo);
2702
2703         if (from_reconnect)
2704                 /*
2705                  * Avoid deadlock here: reconnect work calls
2706                  * cifs_put_tcp_session() at its end. Need to be sure
2707                  * that reconnect work does nothing with server pointer after
2708                  * that step.
2709                  */
2710                 cancel_delayed_work(&server->reconnect);
2711         else
2712                 cancel_delayed_work_sync(&server->reconnect);
2713
2714         spin_lock(&GlobalMid_Lock);
2715         server->tcpStatus = CifsExiting;
2716         spin_unlock(&GlobalMid_Lock);
2717
2718         cifs_crypto_secmech_release(server);
2719         cifs_fscache_release_client_cookie(server);
2720
2721         kfree(server->session_key.response);
2722         server->session_key.response = NULL;
2723         server->session_key.len = 0;
2724
2725         task = xchg(&server->tsk, NULL);
2726         if (task)
2727                 send_sig(SIGKILL, task, 1);
2728 }
2729
2730 struct TCP_Server_Info *
2731 cifs_get_tcp_session(struct smb_vol *volume_info)
2732 {
2733         struct TCP_Server_Info *tcp_ses = NULL;
2734         int rc;
2735
2736         cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
2737
2738         /* see if we already have a matching tcp_ses */
2739         tcp_ses = cifs_find_tcp_session(volume_info);
2740         if (tcp_ses)
2741                 return tcp_ses;
2742
2743         tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
2744         if (!tcp_ses) {
2745                 rc = -ENOMEM;
2746                 goto out_err;
2747         }
2748
2749         tcp_ses->ops = volume_info->ops;
2750         tcp_ses->vals = volume_info->vals;
2751         cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
2752         tcp_ses->hostname = extract_hostname(volume_info->UNC);
2753         if (IS_ERR(tcp_ses->hostname)) {
2754                 rc = PTR_ERR(tcp_ses->hostname);
2755                 goto out_err_crypto_release;
2756         }
2757
2758         tcp_ses->noblockcnt = volume_info->rootfs;
2759         tcp_ses->noblocksnd = volume_info->noblocksnd || volume_info->rootfs;
2760         tcp_ses->noautotune = volume_info->noautotune;
2761         tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
2762         tcp_ses->rdma = volume_info->rdma;
2763         tcp_ses->in_flight = 0;
2764         tcp_ses->max_in_flight = 0;
2765         tcp_ses->credits = 1;
2766         init_waitqueue_head(&tcp_ses->response_q);
2767         init_waitqueue_head(&tcp_ses->request_q);
2768         INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
2769         mutex_init(&tcp_ses->srv_mutex);
2770         memcpy(tcp_ses->workstation_RFC1001_name,
2771                 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2772         memcpy(tcp_ses->server_RFC1001_name,
2773                 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
2774         tcp_ses->session_estab = false;
2775         tcp_ses->sequence_number = 0;
2776         tcp_ses->reconnect_instance = 1;
2777         tcp_ses->lstrp = jiffies;
2778         tcp_ses->compress_algorithm = cpu_to_le16(volume_info->compression);
2779         spin_lock_init(&tcp_ses->req_lock);
2780         INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
2781         INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
2782         INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
2783         INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
2784         mutex_init(&tcp_ses->reconnect_mutex);
2785         memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
2786                sizeof(tcp_ses->srcaddr));
2787         memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
2788                 sizeof(tcp_ses->dstaddr));
2789         if (volume_info->use_client_guid)
2790                 memcpy(tcp_ses->client_guid, volume_info->client_guid,
2791                        SMB2_CLIENT_GUID_SIZE);
2792         else
2793                 generate_random_uuid(tcp_ses->client_guid);
2794         /*
2795          * at this point we are the only ones with the pointer
2796          * to the struct since the kernel thread not created yet
2797          * no need to spinlock this init of tcpStatus or srv_count
2798          */
2799         tcp_ses->tcpStatus = CifsNew;
2800         ++tcp_ses->srv_count;
2801
2802         if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
2803                 volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
2804                 tcp_ses->echo_interval = volume_info->echo_interval * HZ;
2805         else
2806                 tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
2807         if (tcp_ses->rdma) {
2808 #ifndef CONFIG_CIFS_SMB_DIRECT
2809                 cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
2810                 rc = -ENOENT;
2811                 goto out_err_crypto_release;
2812 #endif
2813                 tcp_ses->smbd_conn = smbd_get_connection(
2814                         tcp_ses, (struct sockaddr *)&volume_info->dstaddr);
2815                 if (tcp_ses->smbd_conn) {
2816                         cifs_dbg(VFS, "RDMA transport established\n");
2817                         rc = 0;
2818                         goto smbd_connected;
2819                 } else {
2820                         rc = -ENOENT;
2821                         goto out_err_crypto_release;
2822                 }
2823         }
2824         rc = ip_connect(tcp_ses);
2825         if (rc < 0) {
2826                 cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
2827                 goto out_err_crypto_release;
2828         }
2829 smbd_connected:
2830         /*
2831          * since we're in a cifs function already, we know that
2832          * this will succeed. No need for try_module_get().
2833          */
2834         __module_get(THIS_MODULE);
2835         tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
2836                                   tcp_ses, "cifsd");
2837         if (IS_ERR(tcp_ses->tsk)) {
2838                 rc = PTR_ERR(tcp_ses->tsk);
2839                 cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
2840                 module_put(THIS_MODULE);
2841                 goto out_err_crypto_release;
2842         }
2843         tcp_ses->min_offload = volume_info->min_offload;
2844         tcp_ses->tcpStatus = CifsNeedNegotiate;
2845
2846         tcp_ses->nr_targets = 1;
2847         tcp_ses->ignore_signature = volume_info->ignore_signature;
2848         /* thread spawned, put it on the list */
2849         spin_lock(&cifs_tcp_ses_lock);
2850         list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
2851         spin_unlock(&cifs_tcp_ses_lock);
2852
2853         cifs_fscache_get_client_cookie(tcp_ses);
2854
2855         /* queue echo request delayed work */
2856         queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
2857
2858         return tcp_ses;
2859
2860 out_err_crypto_release:
2861         cifs_crypto_secmech_release(tcp_ses);
2862
2863         put_net(cifs_net_ns(tcp_ses));
2864
2865 out_err:
2866         if (tcp_ses) {
2867                 if (!IS_ERR(tcp_ses->hostname))
2868                         kfree(tcp_ses->hostname);
2869                 if (tcp_ses->ssocket)
2870                         sock_release(tcp_ses->ssocket);
2871                 kfree(tcp_ses);
2872         }
2873         return ERR_PTR(rc);
2874 }
2875
2876 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
2877 {
2878         if (vol->sectype != Unspecified &&
2879             vol->sectype != ses->sectype)
2880                 return 0;
2881
2882         /*
2883          * If an existing session is limited to less channels than
2884          * requested, it should not be reused
2885          */
2886         if (ses->chan_max < vol->max_channels)
2887                 return 0;
2888
2889         switch (ses->sectype) {
2890         case Kerberos:
2891                 if (!uid_eq(vol->cred_uid, ses->cred_uid))
2892                         return 0;
2893                 break;
2894         default:
2895                 /* NULL username means anonymous session */
2896                 if (ses->user_name == NULL) {
2897                         if (!vol->nullauth)
2898                                 return 0;
2899                         break;
2900                 }
2901
2902                 /* anything else takes username/password */
2903                 if (strncmp(ses->user_name,
2904                             vol->username ? vol->username : "",
2905                             CIFS_MAX_USERNAME_LEN))
2906                         return 0;
2907                 if ((vol->username && strlen(vol->username) != 0) &&
2908                     ses->password != NULL &&
2909                     strncmp(ses->password,
2910                             vol->password ? vol->password : "",
2911                             CIFS_MAX_PASSWORD_LEN))
2912                         return 0;
2913         }
2914         return 1;
2915 }
2916
2917 /**
2918  * cifs_setup_ipc - helper to setup the IPC tcon for the session
2919  *
2920  * A new IPC connection is made and stored in the session
2921  * tcon_ipc. The IPC tcon has the same lifetime as the session.
2922  */
2923 static int
2924 cifs_setup_ipc(struct cifs_ses *ses, struct smb_vol *volume_info)
2925 {
2926         int rc = 0, xid;
2927         struct cifs_tcon *tcon;
2928         struct nls_table *nls_codepage;
2929         char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
2930         bool seal = false;
2931         struct TCP_Server_Info *server = ses->server;
2932
2933         /*
2934          * If the mount request that resulted in the creation of the
2935          * session requires encryption, force IPC to be encrypted too.
2936          */
2937         if (volume_info->seal) {
2938                 if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
2939                         seal = true;
2940                 else {
2941                         cifs_server_dbg(VFS,
2942                                  "IPC: server doesn't support encryption\n");
2943                         return -EOPNOTSUPP;
2944                 }
2945         }
2946
2947         tcon = tconInfoAlloc();
2948         if (tcon == NULL)
2949                 return -ENOMEM;
2950
2951         scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
2952
2953         /* cannot fail */
2954         nls_codepage = load_nls_default();
2955
2956         xid = get_xid();
2957         tcon->ses = ses;
2958         tcon->ipc = true;
2959         tcon->seal = seal;
2960         rc = server->ops->tree_connect(xid, ses, unc, tcon, nls_codepage);
2961         free_xid(xid);
2962
2963         if (rc) {
2964                 cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
2965                 tconInfoFree(tcon);
2966                 goto out;
2967         }
2968
2969         cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid);
2970
2971         ses->tcon_ipc = tcon;
2972 out:
2973         unload_nls(nls_codepage);
2974         return rc;
2975 }
2976
2977 /**
2978  * cifs_free_ipc - helper to release the session IPC tcon
2979  *
2980  * Needs to be called everytime a session is destroyed
2981  */
2982 static int
2983 cifs_free_ipc(struct cifs_ses *ses)
2984 {
2985         int rc = 0, xid;
2986         struct cifs_tcon *tcon = ses->tcon_ipc;
2987
2988         if (tcon == NULL)
2989                 return 0;
2990
2991         if (ses->server->ops->tree_disconnect) {
2992                 xid = get_xid();
2993                 rc = ses->server->ops->tree_disconnect(xid, tcon);
2994                 free_xid(xid);
2995         }
2996
2997         if (rc)
2998                 cifs_dbg(FYI, "failed to disconnect IPC tcon (rc=%d)\n", rc);
2999
3000         tconInfoFree(tcon);
3001         ses->tcon_ipc = NULL;
3002         return rc;
3003 }
3004
3005 static struct cifs_ses *
3006 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
3007 {
3008         struct cifs_ses *ses;
3009
3010         spin_lock(&cifs_tcp_ses_lock);
3011         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3012                 if (ses->status == CifsExiting)
3013                         continue;
3014                 if (!match_session(ses, vol))
3015                         continue;
3016                 ++ses->ses_count;
3017                 spin_unlock(&cifs_tcp_ses_lock);
3018                 return ses;
3019         }
3020         spin_unlock(&cifs_tcp_ses_lock);
3021         return NULL;
3022 }
3023
3024 void cifs_put_smb_ses(struct cifs_ses *ses)
3025 {
3026         unsigned int rc, xid;
3027         struct TCP_Server_Info *server = ses->server;
3028
3029         cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
3030
3031         spin_lock(&cifs_tcp_ses_lock);
3032         if (ses->status == CifsExiting) {
3033                 spin_unlock(&cifs_tcp_ses_lock);
3034                 return;
3035         }
3036         if (--ses->ses_count > 0) {
3037                 spin_unlock(&cifs_tcp_ses_lock);
3038                 return;
3039         }
3040         if (ses->status == CifsGood)
3041                 ses->status = CifsExiting;
3042         spin_unlock(&cifs_tcp_ses_lock);
3043
3044         cifs_free_ipc(ses);
3045
3046         if (ses->status == CifsExiting && server->ops->logoff) {
3047                 xid = get_xid();
3048                 rc = server->ops->logoff(xid, ses);
3049                 if (rc)
3050                         cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
3051                                 __func__, rc);
3052                 _free_xid(xid);
3053         }
3054
3055         spin_lock(&cifs_tcp_ses_lock);
3056         list_del_init(&ses->smb_ses_list);
3057         spin_unlock(&cifs_tcp_ses_lock);
3058
3059         /* close any extra channels */
3060         if (ses->chan_count > 1) {
3061                 int i;
3062
3063                 for (i = 1; i < ses->chan_count; i++)
3064                         cifs_put_tcp_session(ses->chans[i].server, 0);
3065         }
3066
3067         sesInfoFree(ses);
3068         cifs_put_tcp_session(server, 0);
3069 }
3070
3071 #ifdef CONFIG_KEYS
3072
3073 /* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
3074 #define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
3075
3076 /* Populate username and pw fields from keyring if possible */
3077 static int
3078 cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
3079 {
3080         int rc = 0;
3081         int is_domain = 0;
3082         const char *delim, *payload;
3083         char *desc;
3084         ssize_t len;
3085         struct key *key;
3086         struct TCP_Server_Info *server = ses->server;
3087         struct sockaddr_in *sa;
3088         struct sockaddr_in6 *sa6;
3089         const struct user_key_payload *upayload;
3090
3091         desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
3092         if (!desc)
3093                 return -ENOMEM;
3094
3095         /* try to find an address key first */
3096         switch (server->dstaddr.ss_family) {
3097         case AF_INET:
3098                 sa = (struct sockaddr_in *)&server->dstaddr;
3099                 sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
3100                 break;
3101         case AF_INET6:
3102                 sa6 = (struct sockaddr_in6 *)&server->dstaddr;
3103                 sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
3104                 break;
3105         default:
3106                 cifs_dbg(FYI, "Bad ss_family (%hu)\n",
3107                          server->dstaddr.ss_family);
3108                 rc = -EINVAL;
3109                 goto out_err;
3110         }
3111
3112         cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
3113         key = request_key(&key_type_logon, desc, "");
3114         if (IS_ERR(key)) {
3115                 if (!ses->domainName) {
3116                         cifs_dbg(FYI, "domainName is NULL\n");
3117                         rc = PTR_ERR(key);
3118                         goto out_err;
3119                 }
3120
3121                 /* didn't work, try to find a domain key */
3122                 sprintf(desc, "cifs:d:%s", ses->domainName);
3123                 cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
3124                 key = request_key(&key_type_logon, desc, "");
3125                 if (IS_ERR(key)) {
3126                         rc = PTR_ERR(key);
3127                         goto out_err;
3128                 }
3129                 is_domain = 1;
3130         }
3131
3132         down_read(&key->sem);
3133         upayload = user_key_payload_locked(key);
3134         if (IS_ERR_OR_NULL(upayload)) {
3135                 rc = upayload ? PTR_ERR(upayload) : -EINVAL;
3136                 goto out_key_put;
3137         }
3138
3139         /* find first : in payload */
3140         payload = upayload->data;
3141         delim = strnchr(payload, upayload->datalen, ':');
3142         cifs_dbg(FYI, "payload=%s\n", payload);
3143         if (!delim) {
3144                 cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
3145                          upayload->datalen);
3146                 rc = -EINVAL;
3147                 goto out_key_put;
3148         }
3149
3150         len = delim - payload;
3151         if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
3152                 cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
3153                          len);
3154                 rc = -EINVAL;
3155                 goto out_key_put;
3156         }
3157
3158         vol->username = kstrndup(payload, len, GFP_KERNEL);
3159         if (!vol->username) {
3160                 cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
3161                          len);
3162                 rc = -ENOMEM;
3163                 goto out_key_put;
3164         }
3165         cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
3166
3167         len = key->datalen - (len + 1);
3168         if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
3169                 cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
3170                 rc = -EINVAL;
3171                 kfree(vol->username);
3172                 vol->username = NULL;
3173                 goto out_key_put;
3174         }
3175
3176         ++delim;
3177         vol->password = kstrndup(delim, len, GFP_KERNEL);
3178         if (!vol->password) {
3179                 cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
3180                          len);
3181                 rc = -ENOMEM;
3182                 kfree(vol->username);
3183                 vol->username = NULL;
3184                 goto out_key_put;
3185         }
3186
3187         /*
3188          * If we have a domain key then we must set the domainName in the
3189          * for the request.
3190          */
3191         if (is_domain && ses->domainName) {
3192                 vol->domainname = kstrndup(ses->domainName,
3193                                            strlen(ses->domainName),
3194                                            GFP_KERNEL);
3195                 if (!vol->domainname) {
3196                         cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
3197                                  len);
3198                         rc = -ENOMEM;
3199                         kfree(vol->username);
3200                         vol->username = NULL;
3201                         kzfree(vol->password);
3202                         vol->password = NULL;
3203                         goto out_key_put;
3204                 }
3205         }
3206
3207 out_key_put:
3208         up_read(&key->sem);
3209         key_put(key);
3210 out_err:
3211         kfree(desc);
3212         cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
3213         return rc;
3214 }
3215 #else /* ! CONFIG_KEYS */
3216 static inline int
3217 cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
3218                    struct cifs_ses *ses __attribute__((unused)))
3219 {
3220         return -ENOSYS;
3221 }
3222 #endif /* CONFIG_KEYS */
3223
3224 /**
3225  * cifs_get_smb_ses - get a session matching @volume_info data from @server
3226  *
3227  * This function assumes it is being called from cifs_mount() where we
3228  * already got a server reference (server refcount +1). See
3229  * cifs_get_tcon() for refcount explanations.
3230  */
3231 struct cifs_ses *
3232 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
3233 {
3234         int rc = -ENOMEM;
3235         unsigned int xid;
3236         struct cifs_ses *ses;
3237         struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3238         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3239
3240         xid = get_xid();
3241
3242         ses = cifs_find_smb_ses(server, volume_info);
3243         if (ses) {
3244                 cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
3245                          ses->status);
3246
3247                 mutex_lock(&ses->session_mutex);
3248                 rc = cifs_negotiate_protocol(xid, ses);
3249                 if (rc) {
3250                         mutex_unlock(&ses->session_mutex);
3251                         /* problem -- put our ses reference */
3252                         cifs_put_smb_ses(ses);
3253                         free_xid(xid);
3254                         return ERR_PTR(rc);
3255                 }
3256                 if (ses->need_reconnect) {
3257                         cifs_dbg(FYI, "Session needs reconnect\n");
3258                         rc = cifs_setup_session(xid, ses,
3259                                                 volume_info->local_nls);
3260                         if (rc) {
3261                                 mutex_unlock(&ses->session_mutex);
3262                                 /* problem -- put our reference */
3263                                 cifs_put_smb_ses(ses);
3264                                 free_xid(xid);
3265                                 return ERR_PTR(rc);
3266                         }
3267                 }
3268                 mutex_unlock(&ses->session_mutex);
3269
3270                 /* existing SMB ses has a server reference already */
3271                 cifs_put_tcp_session(server, 0);
3272                 free_xid(xid);
3273                 return ses;
3274         }
3275
3276         cifs_dbg(FYI, "Existing smb sess not found\n");
3277         ses = sesInfoAlloc();
3278         if (ses == NULL)
3279                 goto get_ses_fail;
3280
3281         /* new SMB session uses our server ref */
3282         ses->server = server;
3283         if (server->dstaddr.ss_family == AF_INET6)
3284                 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
3285         else
3286                 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
3287
3288         if (volume_info->username) {
3289                 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
3290                 if (!ses->user_name)
3291                         goto get_ses_fail;
3292         }
3293
3294         /* volume_info->password freed at unmount */
3295         if (volume_info->password) {
3296                 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
3297                 if (!ses->password)
3298                         goto get_ses_fail;
3299         }
3300         if (volume_info->domainname) {
3301                 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
3302                 if (!ses->domainName)
3303                         goto get_ses_fail;
3304         }
3305         if (volume_info->domainauto)
3306                 ses->domainAuto = volume_info->domainauto;
3307         ses->cred_uid = volume_info->cred_uid;
3308         ses->linux_uid = volume_info->linux_uid;
3309
3310         ses->sectype = volume_info->sectype;
3311         ses->sign = volume_info->sign;
3312         mutex_lock(&ses->session_mutex);
3313
3314         /* add server as first channel */
3315         ses->chans[0].server = server;
3316         ses->chan_count = 1;
3317         ses->chan_max = volume_info->multichannel ? volume_info->max_channels:1;
3318
3319         rc = cifs_negotiate_protocol(xid, ses);
3320         if (!rc)
3321                 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
3322
3323         /* each channel uses a different signing key */
3324         memcpy(ses->chans[0].signkey, ses->smb3signingkey,
3325                sizeof(ses->smb3signingkey));
3326
3327         mutex_unlock(&ses->session_mutex);
3328         if (rc)
3329                 goto get_ses_fail;
3330
3331         /* success, put it on the list and add it as first channel */
3332         spin_lock(&cifs_tcp_ses_lock);
3333         list_add(&ses->smb_ses_list, &server->smb_ses_list);
3334         spin_unlock(&cifs_tcp_ses_lock);
3335
3336         free_xid(xid);
3337
3338         cifs_setup_ipc(ses, volume_info);
3339
3340         return ses;
3341
3342 get_ses_fail:
3343         sesInfoFree(ses);
3344         free_xid(xid);
3345         return ERR_PTR(rc);
3346 }
3347
3348 static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
3349 {
3350         if (tcon->tidStatus == CifsExiting)
3351                 return 0;
3352         if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
3353                 return 0;
3354         if (tcon->seal != volume_info->seal)
3355                 return 0;
3356         if (tcon->snapshot_time != volume_info->snapshot_time)
3357                 return 0;
3358         if (tcon->handle_timeout != volume_info->handle_timeout)
3359                 return 0;
3360         if (tcon->no_lease != volume_info->no_lease)
3361                 return 0;
3362         if (tcon->nodelete != volume_info->nodelete)
3363                 return 0;
3364         return 1;
3365 }
3366
3367 static struct cifs_tcon *
3368 cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
3369 {
3370         struct list_head *tmp;
3371         struct cifs_tcon *tcon;
3372
3373         spin_lock(&cifs_tcp_ses_lock);
3374         list_for_each(tmp, &ses->tcon_list) {
3375                 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
3376 #ifdef CONFIG_CIFS_DFS_UPCALL
3377                 if (tcon->dfs_path)
3378                         continue;
3379 #endif
3380                 if (!match_tcon(tcon, volume_info))
3381                         continue;
3382                 ++tcon->tc_count;
3383                 spin_unlock(&cifs_tcp_ses_lock);
3384                 return tcon;
3385         }
3386         spin_unlock(&cifs_tcp_ses_lock);
3387         return NULL;
3388 }
3389
3390 void
3391 cifs_put_tcon(struct cifs_tcon *tcon)
3392 {
3393         unsigned int xid;
3394         struct cifs_ses *ses;
3395
3396         /*
3397          * IPC tcon share the lifetime of their session and are
3398          * destroyed in the session put function
3399          */
3400         if (tcon == NULL || tcon->ipc)
3401                 return;
3402
3403         ses = tcon->ses;
3404         cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
3405         spin_lock(&cifs_tcp_ses_lock);
3406         if (--tcon->tc_count > 0) {
3407                 spin_unlock(&cifs_tcp_ses_lock);
3408                 return;
3409         }
3410
3411         list_del_init(&tcon->tcon_list);
3412         spin_unlock(&cifs_tcp_ses_lock);
3413
3414         xid = get_xid();
3415         if (ses->server->ops->tree_disconnect)
3416                 ses->server->ops->tree_disconnect(xid, tcon);
3417         _free_xid(xid);
3418
3419         cifs_fscache_release_super_cookie(tcon);
3420         tconInfoFree(tcon);
3421         cifs_put_smb_ses(ses);
3422 }
3423
3424 /**
3425  * cifs_get_tcon - get a tcon matching @volume_info data from @ses
3426  *
3427  * - tcon refcount is the number of mount points using the tcon.
3428  * - ses refcount is the number of tcon using the session.
3429  *
3430  * 1. This function assumes it is being called from cifs_mount() where
3431  *    we already got a session reference (ses refcount +1).
3432  *
3433  * 2. Since we're in the context of adding a mount point, the end
3434  *    result should be either:
3435  *
3436  * a) a new tcon already allocated with refcount=1 (1 mount point) and
3437  *    its session refcount incremented (1 new tcon). This +1 was
3438  *    already done in (1).
3439  *
3440  * b) an existing tcon with refcount+1 (add a mount point to it) and
3441  *    identical ses refcount (no new tcon). Because of (1) we need to
3442  *    decrement the ses refcount.
3443  */
3444 static struct cifs_tcon *
3445 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
3446 {
3447         int rc, xid;
3448         struct cifs_tcon *tcon;
3449
3450         tcon = cifs_find_tcon(ses, volume_info);
3451         if (tcon) {
3452                 /*
3453                  * tcon has refcount already incremented but we need to
3454                  * decrement extra ses reference gotten by caller (case b)
3455                  */
3456                 cifs_dbg(FYI, "Found match on UNC path\n");
3457                 cifs_put_smb_ses(ses);
3458                 return tcon;
3459         }
3460
3461         if (!ses->server->ops->tree_connect) {
3462                 rc = -ENOSYS;
3463                 goto out_fail;
3464         }
3465
3466         tcon = tconInfoAlloc();
3467         if (tcon == NULL) {
3468                 rc = -ENOMEM;
3469                 goto out_fail;
3470         }
3471
3472         if (volume_info->snapshot_time) {
3473                 if (ses->server->vals->protocol_id == 0) {
3474                         cifs_dbg(VFS,
3475                              "Use SMB2 or later for snapshot mount option\n");
3476                         rc = -EOPNOTSUPP;
3477                         goto out_fail;
3478                 } else
3479                         tcon->snapshot_time = volume_info->snapshot_time;
3480         }
3481
3482         if (volume_info->handle_timeout) {
3483                 if (ses->server->vals->protocol_id == 0) {
3484                         cifs_dbg(VFS,
3485                              "Use SMB2.1 or later for handle timeout option\n");
3486                         rc = -EOPNOTSUPP;
3487                         goto out_fail;
3488                 } else
3489                         tcon->handle_timeout = volume_info->handle_timeout;
3490         }
3491
3492         tcon->ses = ses;
3493         if (volume_info->password) {
3494                 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
3495                 if (!tcon->password) {
3496                         rc = -ENOMEM;
3497                         goto out_fail;
3498                 }
3499         }
3500
3501         if (volume_info->seal) {
3502                 if (ses->server->vals->protocol_id == 0) {
3503                         cifs_dbg(VFS,
3504                                  "SMB3 or later required for encryption\n");
3505                         rc = -EOPNOTSUPP;
3506                         goto out_fail;
3507                 } else if (tcon->ses->server->capabilities &
3508                                         SMB2_GLOBAL_CAP_ENCRYPTION)
3509                         tcon->seal = true;
3510                 else {
3511                         cifs_dbg(VFS, "Encryption is not supported on share\n");
3512                         rc = -EOPNOTSUPP;
3513                         goto out_fail;
3514                 }
3515         }
3516
3517         if (volume_info->linux_ext) {
3518                 if (ses->server->posix_ext_supported) {
3519                         tcon->posix_extensions = true;
3520                         pr_warn_once("SMB3.11 POSIX Extensions are experimental\n");
3521                 } else {
3522                         cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n");
3523                         rc = -EOPNOTSUPP;
3524                         goto out_fail;
3525                 }
3526         }
3527
3528         /*
3529          * BB Do we need to wrap session_mutex around this TCon call and Unix
3530          * SetFS as we do on SessSetup and reconnect?
3531          */
3532         xid = get_xid();
3533         rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
3534                                             volume_info->local_nls);
3535         free_xid(xid);
3536         cifs_dbg(FYI, "Tcon rc = %d\n", rc);
3537         if (rc)
3538                 goto out_fail;
3539
3540         tcon->use_persistent = false;
3541         /* check if SMB2 or later, CIFS does not support persistent handles */
3542         if (volume_info->persistent) {
3543                 if (ses->server->vals->protocol_id == 0) {
3544                         cifs_dbg(VFS,
3545                              "SMB3 or later required for persistent handles\n");
3546                         rc = -EOPNOTSUPP;
3547                         goto out_fail;
3548                 } else if (ses->server->capabilities &
3549                            SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
3550                         tcon->use_persistent = true;
3551                 else /* persistent handles requested but not supported */ {
3552                         cifs_dbg(VFS,
3553                                 "Persistent handles not supported on share\n");
3554                         rc = -EOPNOTSUPP;
3555                         goto out_fail;
3556                 }
3557         } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
3558              && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
3559              && (volume_info->nopersistent == false)) {
3560                 cifs_dbg(FYI, "enabling persistent handles\n");
3561                 tcon->use_persistent = true;
3562         } else if (volume_info->resilient) {
3563                 if (ses->server->vals->protocol_id == 0) {
3564                         cifs_dbg(VFS,
3565                              "SMB2.1 or later required for resilient handles\n");
3566                         rc = -EOPNOTSUPP;
3567                         goto out_fail;
3568                 }
3569                 tcon->use_resilient = true;
3570         }
3571
3572         /* If the user really knows what they are doing they can override */
3573         if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
3574                 if (volume_info->cache_ro)
3575                         cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
3576                 else if (volume_info->cache_rw)
3577                         cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
3578         }
3579
3580         if (volume_info->no_lease) {
3581                 if (ses->server->vals->protocol_id == 0) {
3582                         cifs_dbg(VFS,
3583                                 "SMB2 or later required for nolease option\n");
3584                         rc = -EOPNOTSUPP;
3585                         goto out_fail;
3586                 } else
3587                         tcon->no_lease = volume_info->no_lease;
3588         }
3589
3590         /*
3591          * We can have only one retry value for a connection to a share so for
3592          * resources mounted more than once to the same server share the last
3593          * value passed in for the retry flag is used.
3594          */
3595         tcon->retry = volume_info->retry;
3596         tcon->nocase = volume_info->nocase;
3597         tcon->nohandlecache = volume_info->nohandlecache;
3598         tcon->nodelete = volume_info->nodelete;
3599         tcon->local_lease = volume_info->local_lease;
3600         INIT_LIST_HEAD(&tcon->pending_opens);
3601
3602         spin_lock(&cifs_tcp_ses_lock);
3603         list_add(&tcon->tcon_list, &ses->tcon_list);
3604         spin_unlock(&cifs_tcp_ses_lock);
3605
3606         cifs_fscache_get_super_cookie(tcon);
3607
3608         return tcon;
3609
3610 out_fail:
3611         tconInfoFree(tcon);
3612         return ERR_PTR(rc);
3613 }
3614
3615 void
3616 cifs_put_tlink(struct tcon_link *tlink)
3617 {
3618         if (!tlink || IS_ERR(tlink))
3619                 return;
3620
3621         if (!atomic_dec_and_test(&tlink->tl_count) ||
3622             test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
3623                 tlink->tl_time = jiffies;
3624                 return;
3625         }
3626
3627         if (!IS_ERR(tlink_tcon(tlink)))
3628                 cifs_put_tcon(tlink_tcon(tlink));
3629         kfree(tlink);
3630         return;
3631 }
3632
3633 static int
3634 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3635 {
3636         struct cifs_sb_info *old = CIFS_SB(sb);
3637         struct cifs_sb_info *new = mnt_data->cifs_sb;
3638         unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
3639         unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
3640
3641         if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
3642                 return 0;
3643
3644         if (old->mnt_cifs_serverino_autodisabled)
3645                 newflags &= ~CIFS_MOUNT_SERVER_INUM;
3646
3647         if (oldflags != newflags)
3648                 return 0;
3649
3650         /*
3651          * We want to share sb only if we don't specify an r/wsize or
3652          * specified r/wsize is greater than or equal to existing one.
3653          */
3654         if (new->wsize && new->wsize < old->wsize)
3655                 return 0;
3656
3657         if (new->rsize && new->rsize < old->rsize)
3658                 return 0;
3659
3660         if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
3661                 return 0;
3662
3663         if (old->mnt_file_mode != new->mnt_file_mode ||
3664             old->mnt_dir_mode != new->mnt_dir_mode)
3665                 return 0;
3666
3667         if (strcmp(old->local_nls->charset, new->local_nls->charset))
3668                 return 0;
3669
3670         if (old->actimeo != new->actimeo)
3671                 return 0;
3672
3673         return 1;
3674 }
3675
3676 static int
3677 match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
3678 {
3679         struct cifs_sb_info *old = CIFS_SB(sb);
3680         struct cifs_sb_info *new = mnt_data->cifs_sb;
3681         bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
3682                 old->prepath;
3683         bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
3684                 new->prepath;
3685
3686         if (old_set && new_set && !strcmp(new->prepath, old->prepath))
3687                 return 1;
3688         else if (!old_set && !new_set)
3689                 return 1;
3690
3691         return 0;
3692 }
3693
3694 int
3695 cifs_match_super(struct super_block *sb, void *data)
3696 {
3697         struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
3698         struct smb_vol *volume_info;
3699         struct cifs_sb_info *cifs_sb;
3700         struct TCP_Server_Info *tcp_srv;
3701         struct cifs_ses *ses;
3702         struct cifs_tcon *tcon;
3703         struct tcon_link *tlink;
3704         int rc = 0;
3705
3706         spin_lock(&cifs_tcp_ses_lock);
3707         cifs_sb = CIFS_SB(sb);
3708         tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3709         if (IS_ERR(tlink)) {
3710                 spin_unlock(&cifs_tcp_ses_lock);
3711                 return rc;
3712         }
3713         tcon = tlink_tcon(tlink);
3714         ses = tcon->ses;
3715         tcp_srv = ses->server;
3716
3717         volume_info = mnt_data->vol;
3718
3719         if (!match_server(tcp_srv, volume_info) ||
3720             !match_session(ses, volume_info) ||
3721             !match_tcon(tcon, volume_info) ||
3722             !match_prepath(sb, mnt_data)) {
3723                 rc = 0;
3724                 goto out;
3725         }
3726
3727         rc = compare_mount_options(sb, mnt_data);
3728 out:
3729         spin_unlock(&cifs_tcp_ses_lock);
3730         cifs_put_tlink(tlink);
3731         return rc;
3732 }
3733
3734 #ifdef CONFIG_DEBUG_LOCK_ALLOC
3735 static struct lock_class_key cifs_key[2];
3736 static struct lock_class_key cifs_slock_key[2];
3737
3738 static inline void
3739 cifs_reclassify_socket4(struct socket *sock)
3740 {
3741         struct sock *sk = sock->sk;
3742         BUG_ON(!sock_allow_reclassification(sk));
3743         sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
3744                 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
3745 }
3746
3747 static inline void
3748 cifs_reclassify_socket6(struct socket *sock)
3749 {
3750         struct sock *sk = sock->sk;
3751         BUG_ON(!sock_allow_reclassification(sk));
3752         sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
3753                 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
3754 }
3755 #else
3756 static inline void
3757 cifs_reclassify_socket4(struct socket *sock)
3758 {
3759 }
3760
3761 static inline void
3762 cifs_reclassify_socket6(struct socket *sock)
3763 {
3764 }
3765 #endif
3766
3767 /* See RFC1001 section 14 on representation of Netbios names */
3768 static void rfc1002mangle(char *target, char *source, unsigned int length)
3769 {
3770         unsigned int i, j;
3771
3772         for (i = 0, j = 0; i < (length); i++) {
3773                 /* mask a nibble at a time and encode */
3774                 target[j] = 'A' + (0x0F & (source[i] >> 4));
3775                 target[j+1] = 'A' + (0x0F & source[i]);
3776                 j += 2;
3777         }
3778
3779 }
3780
3781 static int
3782 bind_socket(struct TCP_Server_Info *server)
3783 {
3784         int rc = 0;
3785         if (server->srcaddr.ss_family != AF_UNSPEC) {
3786                 /* Bind to the specified local IP address */
3787                 struct socket *socket = server->ssocket;
3788                 rc = socket->ops->bind(socket,
3789                                        (struct sockaddr *) &server->srcaddr,
3790                                        sizeof(server->srcaddr));
3791                 if (rc < 0) {
3792                         struct sockaddr_in *saddr4;
3793                         struct sockaddr_in6 *saddr6;
3794                         saddr4 = (struct sockaddr_in *)&server->srcaddr;
3795                         saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
3796                         if (saddr6->sin6_family == AF_INET6)
3797                                 cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
3798                                          &saddr6->sin6_addr, rc);
3799                         else
3800                                 cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
3801                                          &saddr4->sin_addr.s_addr, rc);
3802                 }
3803         }
3804         return rc;
3805 }
3806
3807 static int
3808 ip_rfc1001_connect(struct TCP_Server_Info *server)
3809 {
3810         int rc = 0;
3811         /*
3812          * some servers require RFC1001 sessinit before sending
3813          * negprot - BB check reconnection in case where second
3814          * sessinit is sent but no second negprot
3815          */
3816         struct rfc1002_session_packet *ses_init_buf;
3817         struct smb_hdr *smb_buf;
3818         ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
3819                                GFP_KERNEL);
3820         if (ses_init_buf) {
3821                 ses_init_buf->trailer.session_req.called_len = 32;
3822
3823                 if (server->server_RFC1001_name[0] != 0)
3824                         rfc1002mangle(ses_init_buf->trailer.
3825                                       session_req.called_name,
3826                                       server->server_RFC1001_name,
3827                                       RFC1001_NAME_LEN_WITH_NULL);
3828                 else
3829                         rfc1002mangle(ses_init_buf->trailer.
3830                                       session_req.called_name,
3831                                       DEFAULT_CIFS_CALLED_NAME,
3832                                       RFC1001_NAME_LEN_WITH_NULL);
3833
3834                 ses_init_buf->trailer.session_req.calling_len = 32;
3835
3836                 /*
3837                  * calling name ends in null (byte 16) from old smb
3838                  * convention.
3839                  */
3840                 if (server->workstation_RFC1001_name[0] != 0)
3841                         rfc1002mangle(ses_init_buf->trailer.
3842                                       session_req.calling_name,
3843                                       server->workstation_RFC1001_name,
3844                                       RFC1001_NAME_LEN_WITH_NULL);
3845                 else
3846                         rfc1002mangle(ses_init_buf->trailer.
3847                                       session_req.calling_name,
3848                                       "LINUX_CIFS_CLNT",
3849                                       RFC1001_NAME_LEN_WITH_NULL);
3850
3851                 ses_init_buf->trailer.session_req.scope1 = 0;
3852                 ses_init_buf->trailer.session_req.scope2 = 0;
3853                 smb_buf = (struct smb_hdr *)ses_init_buf;
3854
3855                 /* sizeof RFC1002_SESSION_REQUEST with no scope */
3856                 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
3857                 rc = smb_send(server, smb_buf, 0x44);
3858                 kfree(ses_init_buf);
3859                 /*
3860                  * RFC1001 layer in at least one server
3861                  * requires very short break before negprot
3862                  * presumably because not expecting negprot
3863                  * to follow so fast.  This is a simple
3864                  * solution that works without
3865                  * complicating the code and causes no
3866                  * significant slowing down on mount
3867                  * for everyone else
3868                  */
3869                 usleep_range(1000, 2000);
3870         }
3871         /*
3872          * else the negprot may still work without this
3873          * even though malloc failed
3874          */
3875
3876         return rc;
3877 }
3878
3879 static int
3880 generic_ip_connect(struct TCP_Server_Info *server)
3881 {
3882         int rc = 0;
3883         __be16 sport;
3884         int slen, sfamily;
3885         struct socket *socket = server->ssocket;
3886         struct sockaddr *saddr;
3887
3888         saddr = (struct sockaddr *) &server->dstaddr;
3889
3890         if (server->dstaddr.ss_family == AF_INET6) {
3891                 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
3892                 slen = sizeof(struct sockaddr_in6);
3893                 sfamily = AF_INET6;
3894         } else {
3895                 sport = ((struct sockaddr_in *) saddr)->sin_port;
3896                 slen = sizeof(struct sockaddr_in);
3897                 sfamily = AF_INET;
3898         }
3899
3900         if (socket == NULL) {
3901                 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
3902                                    IPPROTO_TCP, &socket, 1);
3903                 if (rc < 0) {
3904                         cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
3905                         server->ssocket = NULL;
3906                         return rc;
3907                 }
3908
3909                 /* BB other socket options to set KEEPALIVE, NODELAY? */
3910                 cifs_dbg(FYI, "Socket created\n");
3911                 server->ssocket = socket;
3912                 socket->sk->sk_allocation = GFP_NOFS;
3913                 if (sfamily == AF_INET6)
3914                         cifs_reclassify_socket6(socket);
3915                 else
3916                         cifs_reclassify_socket4(socket);
3917         }
3918
3919         rc = bind_socket(server);
3920         if (rc < 0)
3921                 return rc;
3922
3923         /*
3924          * Eventually check for other socket options to change from
3925          * the default. sock_setsockopt not used because it expects
3926          * user space buffer
3927          */
3928         socket->sk->sk_rcvtimeo = 7 * HZ;
3929         socket->sk->sk_sndtimeo = 5 * HZ;
3930
3931         /* make the bufsizes depend on wsize/rsize and max requests */
3932         if (server->noautotune) {
3933                 if (socket->sk->sk_sndbuf < (200 * 1024))
3934                         socket->sk->sk_sndbuf = 200 * 1024;
3935                 if (socket->sk->sk_rcvbuf < (140 * 1024))
3936                         socket->sk->sk_rcvbuf = 140 * 1024;
3937         }
3938
3939         if (server->tcp_nodelay)
3940                 tcp_sock_set_nodelay(socket->sk);
3941
3942         cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
3943                  socket->sk->sk_sndbuf,
3944                  socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
3945
3946         rc = socket->ops->connect(socket, saddr, slen,
3947                                   server->noblockcnt ? O_NONBLOCK : 0);
3948         /*
3949          * When mounting SMB root file systems, we do not want to block in
3950          * connect. Otherwise bail out and then let cifs_reconnect() perform
3951          * reconnect failover - if possible.
3952          */
3953         if (server->noblockcnt && rc == -EINPROGRESS)
3954                 rc = 0;
3955         if (rc < 0) {
3956                 cifs_dbg(FYI, "Error %d connecting to server\n", rc);
3957                 sock_release(socket);
3958                 server->ssocket = NULL;
3959                 return rc;
3960         }
3961
3962         if (sport == htons(RFC1001_PORT))
3963                 rc = ip_rfc1001_connect(server);
3964
3965         return rc;
3966 }
3967
3968 static int
3969 ip_connect(struct TCP_Server_Info *server)
3970 {
3971         __be16 *sport;
3972         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
3973         struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
3974
3975         if (server->dstaddr.ss_family == AF_INET6)
3976                 sport = &addr6->sin6_port;
3977         else
3978                 sport = &addr->sin_port;
3979
3980         if (*sport == 0) {
3981                 int rc;
3982
3983                 /* try with 445 port at first */
3984                 *sport = htons(CIFS_PORT);
3985
3986                 rc = generic_ip_connect(server);
3987                 if (rc >= 0)
3988                         return rc;
3989
3990                 /* if it failed, try with 139 port */
3991                 *sport = htons(RFC1001_PORT);
3992         }
3993
3994         return generic_ip_connect(server);
3995 }
3996
3997 void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
3998                           struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
3999 {
4000         /* if we are reconnecting then should we check to see if
4001          * any requested capabilities changed locally e.g. via
4002          * remount but we can not do much about it here
4003          * if they have (even if we could detect it by the following)
4004          * Perhaps we could add a backpointer to array of sb from tcon
4005          * or if we change to make all sb to same share the same
4006          * sb as NFS - then we only have one backpointer to sb.
4007          * What if we wanted to mount the server share twice once with
4008          * and once without posixacls or posix paths? */
4009         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
4010
4011         if (vol_info && vol_info->no_linux_ext) {
4012                 tcon->fsUnixInfo.Capability = 0;
4013                 tcon->unix_ext = 0; /* Unix Extensions disabled */
4014                 cifs_dbg(FYI, "Linux protocol extensions disabled\n");
4015                 return;
4016         } else if (vol_info)
4017                 tcon->unix_ext = 1; /* Unix Extensions supported */
4018
4019         if (tcon->unix_ext == 0) {
4020                 cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
4021                 return;
4022         }
4023
4024         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
4025                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
4026                 cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
4027                 /* check for reconnect case in which we do not
4028                    want to change the mount behavior if we can avoid it */
4029                 if (vol_info == NULL) {
4030                         /* turn off POSIX ACL and PATHNAMES if not set
4031                            originally at mount time */
4032                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
4033                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
4034                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
4035                                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
4036                                         cifs_dbg(VFS, "POSIXPATH support change\n");
4037                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
4038                         } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
4039                                 cifs_dbg(VFS, "possible reconnect error\n");
4040                                 cifs_dbg(VFS, "server disabled POSIX path support\n");
4041                         }
4042                 }
4043
4044                 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
4045                         cifs_dbg(VFS, "per-share encryption not supported yet\n");
4046
4047                 cap &= CIFS_UNIX_CAP_MASK;
4048                 if (vol_info && vol_info->no_psx_acl)
4049                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
4050                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
4051                         cifs_dbg(FYI, "negotiated posix acl support\n");
4052                         if (cifs_sb)
4053                                 cifs_sb->mnt_cifs_flags |=
4054                                         CIFS_MOUNT_POSIXACL;
4055                 }
4056
4057                 if (vol_info && vol_info->posix_paths == 0)
4058                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
4059                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
4060                         cifs_dbg(FYI, "negotiate posix pathnames\n");
4061                         if (cifs_sb)
4062                                 cifs_sb->mnt_cifs_flags |=
4063                                         CIFS_MOUNT_POSIX_PATHS;
4064                 }
4065
4066                 cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
4067 #ifdef CONFIG_CIFS_DEBUG2
4068                 if (cap & CIFS_UNIX_FCNTL_CAP)
4069                         cifs_dbg(FYI, "FCNTL cap\n");
4070                 if (cap & CIFS_UNIX_EXTATTR_CAP)
4071                         cifs_dbg(FYI, "EXTATTR cap\n");
4072                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
4073                         cifs_dbg(FYI, "POSIX path cap\n");
4074                 if (cap & CIFS_UNIX_XATTR_CAP)
4075                         cifs_dbg(FYI, "XATTR cap\n");
4076                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
4077                         cifs_dbg(FYI, "POSIX ACL cap\n");
4078                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
4079                         cifs_dbg(FYI, "very large read cap\n");
4080                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
4081                         cifs_dbg(FYI, "very large write cap\n");
4082                 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
4083                         cifs_dbg(FYI, "transport encryption cap\n");
4084                 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
4085                         cifs_dbg(FYI, "mandatory transport encryption cap\n");
4086 #endif /* CIFS_DEBUG2 */
4087                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
4088                         if (vol_info == NULL) {
4089                                 cifs_dbg(FYI, "resetting capabilities failed\n");
4090                         } else
4091                                 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");
4092
4093                 }
4094         }
4095 }
4096
4097 int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
4098                         struct cifs_sb_info *cifs_sb)
4099 {
4100         INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
4101
4102         spin_lock_init(&cifs_sb->tlink_tree_lock);
4103         cifs_sb->tlink_tree = RB_ROOT;
4104
4105         cifs_sb->bsize = pvolume_info->bsize;
4106         /*
4107          * Temporarily set r/wsize for matching superblock. If we end up using
4108          * new sb then client will later negotiate it downward if needed.
4109          */
4110         cifs_sb->rsize = pvolume_info->rsize;
4111         cifs_sb->wsize = pvolume_info->wsize;
4112
4113         cifs_sb->mnt_uid = pvolume_info->linux_uid;
4114         cifs_sb->mnt_gid = pvolume_info->linux_gid;
4115         cifs_sb->mnt_file_mode = pvolume_info->file_mode;
4116         cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
4117         cifs_dbg(FYI, "file mode: %04ho  dir mode: %04ho\n",
4118                  cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
4119
4120         cifs_sb->actimeo = pvolume_info->actimeo;
4121         cifs_sb->local_nls = pvolume_info->local_nls;
4122
4123         if (pvolume_info->nodfs)
4124                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_DFS;
4125         if (pvolume_info->noperm)
4126                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
4127         if (pvolume_info->setuids)
4128                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
4129         if (pvolume_info->setuidfromacl)
4130                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
4131         if (pvolume_info->server_ino)
4132                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
4133         if (pvolume_info->remap)
4134                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
4135         if (pvolume_info->sfu_remap)
4136                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
4137         if (pvolume_info->no_xattr)
4138                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
4139         if (pvolume_info->sfu_emul)
4140                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
4141         if (pvolume_info->nobrl)
4142                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
4143         if (pvolume_info->nohandlecache)
4144                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_HANDLE_CACHE;
4145         if (pvolume_info->nostrictsync)
4146                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
4147         if (pvolume_info->mand_lock)
4148                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
4149         if (pvolume_info->rwpidforward)
4150                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
4151         if (pvolume_info->mode_ace)
4152                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MODE_FROM_SID;
4153         if (pvolume_info->cifs_acl)
4154                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
4155         if (pvolume_info->backupuid_specified) {
4156                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
4157                 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
4158         }
4159         if (pvolume_info->backupgid_specified) {
4160                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
4161                 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
4162         }
4163         if (pvolume_info->override_uid)
4164                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
4165         if (pvolume_info->override_gid)
4166                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
4167         if (pvolume_info->dynperm)
4168                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
4169         if (pvolume_info->fsc)
4170                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
4171         if (pvolume_info->multiuser)
4172                 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
4173                                             CIFS_MOUNT_NO_PERM);
4174         if (pvolume_info->strict_io)
4175                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
4176         if (pvolume_info->direct_io) {
4177                 cifs_dbg(FYI, "mounting share using direct i/o\n");
4178                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
4179         }
4180         if (pvolume_info->cache_ro) {
4181                 cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
4182                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
4183         } else if (pvolume_info->cache_rw) {
4184                 cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
4185                 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
4186                                             CIFS_MOUNT_RW_CACHE);
4187         }
4188         if (pvolume_info->mfsymlinks) {
4189                 if (pvolume_info->sfu_emul) {
4190                         /*
4191                          * Our SFU ("Services for Unix" emulation does not allow
4192                          * creating symlinks but does allow reading existing SFU
4193                          * symlinks (it does allow both creating and reading SFU
4194                          * style mknod and FIFOs though). When "mfsymlinks" and
4195                          * "sfu" are both enabled at the same time, it allows
4196                          * reading both types of symlinks, but will only create
4197                          * them with mfsymlinks format. This allows better
4198                          * Apple compatibility (probably better for Samba too)
4199                          * while still recognizing old Windows style symlinks.
4200                          */
4201                         cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
4202                 }
4203                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
4204         }
4205
4206         if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
4207                 cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
4208
4209         if (pvolume_info->prepath) {
4210                 cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
4211                 if (cifs_sb->prepath == NULL)
4212                         return -ENOMEM;
4213         }
4214
4215         return 0;
4216 }
4217
4218 void
4219 cifs_cleanup_volume_info_contents(struct smb_vol *volume_info)
4220 {
4221         kfree(volume_info->username);
4222         kzfree(volume_info->password);
4223         kfree(volume_info->UNC);
4224         kfree(volume_info->domainname);
4225         kfree(volume_info->iocharset);
4226         kfree(volume_info->prepath);
4227 }
4228
4229 void
4230 cifs_cleanup_volume_info(struct smb_vol *volume_info)
4231 {
4232         if (!volume_info)
4233                 return;
4234         cifs_cleanup_volume_info_contents(volume_info);
4235         kfree(volume_info);
4236 }
4237
4238 /* Release all succeed connections */
4239 static inline void mount_put_conns(struct cifs_sb_info *cifs_sb,
4240                                    unsigned int xid,
4241                                    struct TCP_Server_Info *server,
4242                                    struct cifs_ses *ses, struct cifs_tcon *tcon)
4243 {
4244         int rc = 0;
4245
4246         if (tcon)
4247                 cifs_put_tcon(tcon);
4248         else if (ses)
4249                 cifs_put_smb_ses(ses);
4250         else if (server)
4251                 cifs_put_tcp_session(server, 0);
4252         cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
4253         free_xid(xid);
4254 }
4255
4256 /* Get connections for tcp, ses and tcon */
4257 static int mount_get_conns(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
4258                            unsigned int *xid,
4259                            struct TCP_Server_Info **nserver,
4260                            struct cifs_ses **nses, struct cifs_tcon **ntcon)
4261 {
4262         int rc = 0;
4263         struct TCP_Server_Info *server;
4264         struct cifs_ses *ses;
4265         struct cifs_tcon *tcon;
4266
4267         *nserver = NULL;
4268         *nses = NULL;
4269         *ntcon = NULL;
4270
4271         *xid = get_xid();
4272
4273         /* get a reference to a tcp session */
4274         server = cifs_get_tcp_session(vol);
4275         if (IS_ERR(server)) {
4276                 rc = PTR_ERR(server);
4277                 return rc;
4278         }
4279
4280         *nserver = server;
4281
4282         if ((vol->max_credits < 20) || (vol->max_credits > 60000))
4283                 server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
4284         else
4285                 server->max_credits = vol->max_credits;
4286
4287         /* get a reference to a SMB session */
4288         ses = cifs_get_smb_ses(server, vol);
4289         if (IS_ERR(ses)) {
4290                 rc = PTR_ERR(ses);
4291                 return rc;
4292         }
4293
4294         *nses = ses;
4295
4296         if ((vol->persistent == true) && (!(ses->server->capabilities &
4297                                             SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
4298                 cifs_server_dbg(VFS, "persistent handles not supported by server\n");
4299                 return -EOPNOTSUPP;
4300         }
4301
4302         /* search for existing tcon to this server share */
4303         tcon = cifs_get_tcon(ses, vol);
4304         if (IS_ERR(tcon)) {
4305                 rc = PTR_ERR(tcon);
4306                 return rc;
4307         }
4308
4309         *ntcon = tcon;
4310
4311         /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
4312         if (tcon->posix_extensions)
4313                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
4314
4315         /* tell server which Unix caps we support */
4316         if (cap_unix(tcon->ses)) {
4317                 /*
4318                  * reset of caps checks mount to see if unix extensions disabled
4319                  * for just this mount.
4320                  */
4321                 reset_cifs_unix_caps(*xid, tcon, cifs_sb, vol);
4322                 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
4323                     (le64_to_cpu(tcon->fsUnixInfo.Capability) &
4324                      CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP))
4325                         return -EACCES;
4326         } else
4327                 tcon->unix_ext = 0; /* server does not support them */
4328
4329         /* do not care if a following call succeed - informational */
4330         if (!tcon->pipe && server->ops->qfs_tcon) {
4331                 server->ops->qfs_tcon(*xid, tcon, cifs_sb);
4332                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
4333                         if (tcon->fsDevInfo.DeviceCharacteristics &
4334                             cpu_to_le32(FILE_READ_ONLY_DEVICE))
4335                                 cifs_dbg(VFS, "mounted to read only share\n");
4336                         else if ((cifs_sb->mnt_cifs_flags &
4337                                   CIFS_MOUNT_RW_CACHE) == 0)
4338                                 cifs_dbg(VFS, "read only mount of RW share\n");
4339                         /* no need to log a RW mount of a typical RW share */
4340                 }
4341         }
4342
4343         cifs_sb->wsize = server->ops->negotiate_wsize(tcon, vol);
4344         cifs_sb->rsize = server->ops->negotiate_rsize(tcon, vol);
4345
4346         return 0;
4347 }
4348
4349 static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
4350                              struct cifs_tcon *tcon)
4351 {
4352         struct tcon_link *tlink;
4353
4354         /* hang the tcon off of the superblock */
4355         tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
4356         if (tlink == NULL)
4357                 return -ENOMEM;
4358
4359         tlink->tl_uid = ses->linux_uid;
4360         tlink->tl_tcon = tcon;
4361         tlink->tl_time = jiffies;
4362         set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
4363         set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
4364
4365         cifs_sb->master_tlink = tlink;
4366         spin_lock(&cifs_sb->tlink_tree_lock);
4367         tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
4368         spin_unlock(&cifs_sb->tlink_tree_lock);
4369
4370         queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
4371                                 TLINK_IDLE_EXPIRE);
4372         return 0;
4373 }
4374
4375 #ifdef CONFIG_CIFS_DFS_UPCALL
4376 /*
4377  * cifs_build_path_to_root returns full path to root when we do not have an
4378  * exiting connection (tcon)
4379  */
4380 static char *
4381 build_unc_path_to_root(const struct smb_vol *vol,
4382                        const struct cifs_sb_info *cifs_sb, bool useppath)
4383 {
4384         char *full_path, *pos;
4385         unsigned int pplen = useppath && vol->prepath ?
4386                 strlen(vol->prepath) + 1 : 0;
4387         unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
4388
4389         if (unc_len > MAX_TREE_SIZE)
4390                 return ERR_PTR(-EINVAL);
4391
4392         full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
4393         if (full_path == NULL)
4394                 return ERR_PTR(-ENOMEM);
4395
4396         memcpy(full_path, vol->UNC, unc_len);
4397         pos = full_path + unc_len;
4398
4399         if (pplen) {
4400                 *pos = CIFS_DIR_SEP(cifs_sb);
4401                 memcpy(pos + 1, vol->prepath, pplen);
4402                 pos += pplen;
4403         }
4404
4405         *pos = '\0'; /* add trailing null */
4406         convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
4407         cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
4408         return full_path;
4409 }
4410
4411 /**
4412  * expand_dfs_referral - Perform a dfs referral query and update the cifs_sb
4413  *
4414  *
4415  * If a referral is found, cifs_sb->mountdata will be (re-)allocated
4416  * to a string containing updated options for the submount.  Otherwise it
4417  * will be left untouched.
4418  *
4419  * Returns the rc from get_dfs_path to the caller, which can be used to
4420  * determine whether there were referrals.
4421  */
4422 static int
4423 expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
4424                     struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
4425                     int check_prefix)
4426 {
4427         int rc;
4428         struct dfs_info3_param referral = {0};
4429         char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
4430
4431         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
4432                 return -EREMOTE;
4433
4434         full_path = build_unc_path_to_root(volume_info, cifs_sb, true);
4435         if (IS_ERR(full_path))
4436                 return PTR_ERR(full_path);
4437
4438         /* For DFS paths, skip the first '\' of the UNC */
4439         ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
4440
4441         rc = dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
4442                             ref_path, &referral, NULL);
4443         if (!rc) {
4444                 char *fake_devname = NULL;
4445
4446                 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
4447                                                    full_path + 1, &referral,
4448                                                    &fake_devname);
4449                 free_dfs_info_param(&referral);
4450
4451                 if (IS_ERR(mdata)) {
4452                         rc = PTR_ERR(mdata);
4453                         mdata = NULL;
4454                 } else {
4455                         cifs_cleanup_volume_info_contents(volume_info);
4456                         rc = cifs_setup_volume_info(volume_info, mdata,
4457                                                     fake_devname, false);
4458                 }
4459                 kfree(fake_devname);
4460                 kfree(cifs_sb->mountdata);
4461                 cifs_sb->mountdata = mdata;
4462         }
4463         kfree(full_path);
4464         return rc;
4465 }
4466
4467 static inline int get_next_dfs_tgt(const char *path,
4468                                    struct dfs_cache_tgt_list *tgt_list,
4469                                    struct dfs_cache_tgt_iterator **tgt_it)
4470 {
4471         if (!*tgt_it)
4472                 *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
4473         else
4474                 *tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it);
4475         return !*tgt_it ? -EHOSTDOWN : 0;
4476 }
4477
4478 static int update_vol_info(const struct dfs_cache_tgt_iterator *tgt_it,
4479                            struct smb_vol *fake_vol, struct smb_vol *vol)
4480 {
4481         const char *tgt = dfs_cache_get_tgt_name(tgt_it);
4482         int len = strlen(tgt) + 2;
4483         char *new_unc;
4484
4485         new_unc = kmalloc(len, GFP_KERNEL);
4486         if (!new_unc)
4487                 return -ENOMEM;
4488         scnprintf(new_unc, len, "\\%s", tgt);
4489
4490         kfree(vol->UNC);
4491         vol->UNC = new_unc;
4492
4493         if (fake_vol->prepath) {
4494                 kfree(vol->prepath);
4495                 vol->prepath = fake_vol->prepath;
4496                 fake_vol->prepath = NULL;
4497         }
4498         memcpy(&vol->dstaddr, &fake_vol->dstaddr, sizeof(vol->dstaddr));
4499
4500         return 0;
4501 }
4502
4503 static int setup_dfs_tgt_conn(const char *path,
4504                               const struct dfs_cache_tgt_iterator *tgt_it,
4505                               struct cifs_sb_info *cifs_sb,
4506                               struct smb_vol *vol,
4507                               unsigned int *xid,
4508                               struct TCP_Server_Info **server,
4509                               struct cifs_ses **ses,
4510                               struct cifs_tcon **tcon)
4511 {
4512         int rc;
4513         struct dfs_info3_param ref = {0};
4514         char *mdata = NULL, *fake_devname = NULL;
4515         struct smb_vol fake_vol = {NULL};
4516
4517         cifs_dbg(FYI, "%s: dfs path: %s\n", __func__, path);
4518
4519         rc = dfs_cache_get_tgt_referral(path, tgt_it, &ref);
4520         if (rc)
4521                 return rc;
4522
4523         mdata = cifs_compose_mount_options(cifs_sb->mountdata, path, &ref,
4524                                            &fake_devname);
4525         free_dfs_info_param(&ref);
4526
4527         if (IS_ERR(mdata)) {
4528                 rc = PTR_ERR(mdata);
4529                 mdata = NULL;
4530         } else {
4531                 cifs_dbg(FYI, "%s: fake_devname: %s\n", __func__, fake_devname);
4532                 rc = cifs_setup_volume_info(&fake_vol, mdata, fake_devname,
4533                                             false);
4534         }
4535         kfree(mdata);
4536         kfree(fake_devname);
4537
4538         if (!rc) {
4539                 /*
4540                  * We use a 'fake_vol' here because we need pass it down to the
4541                  * mount_{get,put} functions to test connection against new DFS
4542                  * targets.
4543                  */
4544                 mount_put_conns(cifs_sb, *xid, *server, *ses, *tcon);
4545                 rc = mount_get_conns(&fake_vol, cifs_sb, xid, server, ses,
4546                                      tcon);
4547                 if (!rc) {
4548                         /*
4549                          * We were able to connect to new target server.
4550                          * Update current volume info with new target server.
4551                          */
4552                         rc = update_vol_info(tgt_it, &fake_vol, vol);
4553                 }
4554         }
4555         cifs_cleanup_volume_info_contents(&fake_vol);
4556         return rc;
4557 }
4558
4559 static int mount_do_dfs_failover(const char *path,
4560                                  struct cifs_sb_info *cifs_sb,
4561                                  struct smb_vol *vol,
4562                                  struct cifs_ses *root_ses,
4563                                  unsigned int *xid,
4564                                  struct TCP_Server_Info **server,
4565                                  struct cifs_ses **ses,
4566                                  struct cifs_tcon **tcon)
4567 {
4568         int rc;
4569         struct dfs_cache_tgt_list tgt_list;
4570         struct dfs_cache_tgt_iterator *tgt_it = NULL;
4571
4572         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
4573                 return -EOPNOTSUPP;
4574
4575         rc = dfs_cache_noreq_find(path, NULL, &tgt_list);
4576         if (rc)
4577                 return rc;
4578
4579         for (;;) {
4580                 /* Get next DFS target server - if any */
4581                 rc = get_next_dfs_tgt(path, &tgt_list, &tgt_it);
4582                 if (rc)
4583                         break;
4584                 /* Connect to next DFS target */
4585                 rc = setup_dfs_tgt_conn(path, tgt_it, cifs_sb, vol, xid, server,
4586                                         ses, tcon);
4587                 if (!rc || rc == -EACCES || rc == -EOPNOTSUPP)
4588                         break;
4589         }
4590         if (!rc) {
4591                 /*
4592                  * Update DFS target hint in DFS referral cache with the target
4593                  * server we successfully reconnected to.
4594                  */
4595                 rc = dfs_cache_update_tgthint(*xid, root_ses ? root_ses : *ses,
4596                                               cifs_sb->local_nls,
4597                                               cifs_remap(cifs_sb), path,
4598                                               tgt_it);
4599         }
4600         dfs_cache_free_tgts(&tgt_list);
4601         return rc;
4602 }
4603 #endif
4604
4605 int
4606 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
4607                         const char *devname, bool is_smb3)
4608 {
4609         int rc = 0;
4610
4611         if (cifs_parse_mount_options(mount_data, devname, volume_info, is_smb3))
4612                 return -EINVAL;
4613
4614         if (volume_info->nullauth) {
4615                 cifs_dbg(FYI, "Anonymous login\n");
4616                 kfree(volume_info->username);
4617                 volume_info->username = NULL;
4618         } else if (volume_info->username) {
4619                 /* BB fixme parse for domain name here */
4620                 cifs_dbg(FYI, "Username: %s\n", volume_info->username);
4621         } else {
4622                 cifs_dbg(VFS, "No username specified\n");
4623         /* In userspace mount helper we can get user name from alternate
4624            locations such as env variables and files on disk */
4625                 return -EINVAL;
4626         }
4627
4628         /* this is needed for ASCII cp to Unicode converts */
4629         if (volume_info->iocharset == NULL) {
4630                 /* load_nls_default cannot return null */
4631                 volume_info->local_nls = load_nls_default();
4632         } else {
4633                 volume_info->local_nls = load_nls(volume_info->iocharset);
4634                 if (volume_info->local_nls == NULL) {
4635                         cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
4636                                  volume_info->iocharset);
4637                         return -ELIBACC;
4638                 }
4639         }
4640
4641         return rc;
4642 }
4643
4644 struct smb_vol *
4645 cifs_get_volume_info(char *mount_data, const char *devname, bool is_smb3)
4646 {
4647         int rc;
4648         struct smb_vol *volume_info;
4649
4650         volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
4651         if (!volume_info)
4652                 return ERR_PTR(-ENOMEM);
4653
4654         rc = cifs_setup_volume_info(volume_info, mount_data, devname, is_smb3);
4655         if (rc) {
4656                 cifs_cleanup_volume_info(volume_info);
4657                 volume_info = ERR_PTR(rc);
4658         }
4659
4660         return volume_info;
4661 }
4662
4663 static int
4664 cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
4665                                         unsigned int xid,
4666                                         struct cifs_tcon *tcon,
4667                                         struct cifs_sb_info *cifs_sb,
4668                                         char *full_path,
4669                                         int added_treename)
4670 {
4671         int rc;
4672         char *s;
4673         char sep, tmp;
4674         int skip = added_treename ? 1 : 0;
4675
4676         sep = CIFS_DIR_SEP(cifs_sb);
4677         s = full_path;
4678
4679         rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
4680         while (rc == 0) {
4681                 /* skip separators */
4682                 while (*s == sep)
4683                         s++;
4684                 if (!*s)
4685                         break;
4686                 /* next separator */
4687                 while (*s && *s != sep)
4688                         s++;
4689                 /*
4690                  * if the treename is added, we then have to skip the first
4691                  * part within the separators
4692                  */
4693                 if (skip) {
4694                         skip = 0;
4695                         continue;
4696                 }
4697                 /*
4698                  * temporarily null-terminate the path at the end of
4699                  * the current component
4700                  */
4701                 tmp = *s;
4702                 *s = 0;
4703                 rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
4704                                                      full_path);
4705                 *s = tmp;
4706         }
4707         return rc;
4708 }
4709
4710 /*
4711  * Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is,
4712  * otherwise 0.
4713  */
4714 static int is_path_remote(struct cifs_sb_info *cifs_sb, struct smb_vol *vol,
4715                           const unsigned int xid,
4716                           struct TCP_Server_Info *server,
4717                           struct cifs_tcon *tcon)
4718 {
4719         int rc;
4720         char *full_path;
4721
4722         if (!server->ops->is_path_accessible)
4723                 return -EOPNOTSUPP;
4724
4725         /*
4726          * cifs_build_path_to_root works only when we have a valid tcon
4727          */
4728         full_path = cifs_build_path_to_root(vol, cifs_sb, tcon,
4729                                             tcon->Flags & SMB_SHARE_IS_IN_DFS);
4730         if (full_path == NULL)
4731                 return -ENOMEM;
4732
4733         cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
4734
4735         rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
4736                                              full_path);
4737         if (rc != 0 && rc != -EREMOTE) {
4738                 kfree(full_path);
4739                 return rc;
4740         }
4741
4742         if (rc != -EREMOTE) {
4743                 rc = cifs_are_all_path_components_accessible(server, xid, tcon,
4744                         cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
4745                 if (rc != 0) {
4746                         cifs_server_dbg(VFS, "cannot query dirs between root and final path, enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
4747                         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
4748                         rc = 0;
4749                 }
4750         }
4751
4752         kfree(full_path);
4753         return rc;
4754 }
4755
4756 #ifdef CONFIG_CIFS_DFS_UPCALL
4757 static inline void set_root_tcon(struct cifs_sb_info *cifs_sb,
4758                                  struct cifs_tcon *tcon,
4759                                  struct cifs_tcon **root)
4760 {
4761         spin_lock(&cifs_tcp_ses_lock);
4762         tcon->tc_count++;
4763         tcon->remap = cifs_remap(cifs_sb);
4764         spin_unlock(&cifs_tcp_ses_lock);
4765         *root = tcon;
4766 }
4767
4768 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
4769 {
4770         int rc = 0;
4771         unsigned int xid;
4772         struct cifs_ses *ses;
4773         struct cifs_tcon *root_tcon = NULL;
4774         struct cifs_tcon *tcon = NULL;
4775         struct TCP_Server_Info *server;
4776         char *root_path = NULL, *full_path = NULL;
4777         char *old_mountdata, *origin_mountdata = NULL;
4778         int count;
4779
4780         rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
4781         if (!rc && tcon) {
4782                 /* If not a standalone DFS root, then check if path is remote */
4783                 rc = dfs_cache_find(xid, ses, cifs_sb->local_nls,
4784                                     cifs_remap(cifs_sb), vol->UNC + 1, NULL,
4785                                     NULL);
4786                 if (rc) {
4787                         rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
4788                         if (!rc)
4789                                 goto out;
4790                         if (rc != -EREMOTE)
4791                                 goto error;
4792                 }
4793         }
4794         /*
4795          * If first DFS target server went offline and we failed to connect it,
4796          * server and ses pointers are NULL at this point, though we still have
4797          * chance to get a cached DFS referral in expand_dfs_referral() and
4798          * retry next target available in it.
4799          *
4800          * If a NULL ses ptr is passed to dfs_cache_find(), a lookup will be
4801          * performed against DFS path and *no* requests will be sent to server
4802          * for any new DFS referrals. Hence it's safe to skip checking whether
4803          * server or ses ptr is NULL.
4804          */
4805         if (rc == -EACCES || rc == -EOPNOTSUPP)
4806                 goto error;
4807
4808         root_path = build_unc_path_to_root(vol, cifs_sb, false);
4809         if (IS_ERR(root_path)) {
4810                 rc = PTR_ERR(root_path);
4811                 root_path = NULL;
4812                 goto error;
4813         }
4814
4815         full_path = build_unc_path_to_root(vol, cifs_sb, true);
4816         if (IS_ERR(full_path)) {
4817                 rc = PTR_ERR(full_path);
4818                 full_path = NULL;
4819                 goto error;
4820         }
4821         /*
4822          * Perform an unconditional check for whether there are DFS
4823          * referrals for this path without prefix, to provide support
4824          * for DFS referrals from w2k8 servers which don't seem to respond
4825          * with PATH_NOT_COVERED to requests that include the prefix.
4826          * Chase the referral if found, otherwise continue normally.
4827          */
4828         old_mountdata = cifs_sb->mountdata;
4829         (void)expand_dfs_referral(xid, ses, vol, cifs_sb, false);
4830
4831         if (cifs_sb->mountdata == NULL) {
4832                 rc = -ENOENT;
4833                 goto error;
4834         }
4835
4836         /* Save DFS root volume information for DFS refresh worker */
4837         origin_mountdata = kstrndup(cifs_sb->mountdata,
4838                                     strlen(cifs_sb->mountdata), GFP_KERNEL);
4839         if (!origin_mountdata) {
4840                 rc = -ENOMEM;
4841                 goto error;
4842         }
4843
4844         if (cifs_sb->mountdata != old_mountdata) {
4845                 /* If we were redirected, reconnect to new target server */
4846                 mount_put_conns(cifs_sb, xid, server, ses, tcon);
4847                 rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
4848         }
4849         if (rc) {
4850                 if (rc == -EACCES || rc == -EOPNOTSUPP)
4851                         goto error;
4852                 /* Perform DFS failover to any other DFS targets */
4853                 rc = mount_do_dfs_failover(root_path + 1, cifs_sb, vol, NULL,
4854                                            &xid, &server, &ses, &tcon);
4855                 if (rc)
4856                         goto error;
4857         }
4858
4859         kfree(root_path);
4860         root_path = build_unc_path_to_root(vol, cifs_sb, false);
4861         if (IS_ERR(root_path)) {
4862                 rc = PTR_ERR(root_path);
4863                 root_path = NULL;
4864                 goto error;
4865         }
4866         /* Cache out resolved root server */
4867         (void)dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
4868                              root_path + 1, NULL, NULL);
4869         kfree(root_path);
4870         root_path = NULL;
4871
4872         set_root_tcon(cifs_sb, tcon, &root_tcon);
4873
4874         for (count = 1; ;) {
4875                 if (!rc && tcon) {
4876                         rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
4877                         if (!rc || rc != -EREMOTE)
4878                                 break;
4879                 }
4880                 /*
4881                  * BB: when we implement proper loop detection,
4882                  *     we will remove this check. But now we need it
4883                  *     to prevent an indefinite loop if 'DFS tree' is
4884                  *     misconfigured (i.e. has loops).
4885                  */
4886                 if (count++ > MAX_NESTED_LINKS) {
4887                         rc = -ELOOP;
4888                         break;
4889                 }
4890
4891                 kfree(full_path);
4892                 full_path = build_unc_path_to_root(vol, cifs_sb, true);
4893                 if (IS_ERR(full_path)) {
4894                         rc = PTR_ERR(full_path);
4895                         full_path = NULL;
4896                         break;
4897                 }
4898
4899                 old_mountdata = cifs_sb->mountdata;
4900                 rc = expand_dfs_referral(xid, root_tcon->ses, vol, cifs_sb,
4901                                          true);
4902                 if (rc)
4903                         break;
4904
4905                 if (cifs_sb->mountdata != old_mountdata) {
4906                         mount_put_conns(cifs_sb, xid, server, ses, tcon);
4907                         rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses,
4908                                              &tcon);
4909                         /*
4910                          * Ensure that DFS referrals go through new root server.
4911                          */
4912                         if (!rc && tcon &&
4913                             (tcon->share_flags & (SHI1005_FLAGS_DFS |
4914                                                   SHI1005_FLAGS_DFS_ROOT))) {
4915                                 cifs_put_tcon(root_tcon);
4916                                 set_root_tcon(cifs_sb, tcon, &root_tcon);
4917                         }
4918                 }
4919                 if (rc) {
4920                         if (rc == -EACCES || rc == -EOPNOTSUPP)
4921                                 break;
4922                         /* Perform DFS failover to any other DFS targets */
4923                         rc = mount_do_dfs_failover(full_path + 1, cifs_sb, vol,
4924                                                    root_tcon->ses, &xid,
4925                                                    &server, &ses, &tcon);
4926                         if (rc == -EACCES || rc == -EOPNOTSUPP || !server ||
4927                             !ses)
4928                                 goto error;
4929                 }
4930         }
4931         cifs_put_tcon(root_tcon);
4932
4933         if (rc)
4934                 goto error;
4935
4936         spin_lock(&cifs_tcp_ses_lock);
4937         if (!tcon->dfs_path) {
4938                 /* Save full path in new tcon to do failover when reconnecting tcons */
4939                 tcon->dfs_path = full_path;
4940                 full_path = NULL;
4941                 tcon->remap = cifs_remap(cifs_sb);
4942         }
4943         cifs_sb->origin_fullpath = kstrndup(tcon->dfs_path,
4944                                             strlen(tcon->dfs_path),
4945                                             GFP_ATOMIC);
4946         if (!cifs_sb->origin_fullpath) {
4947                 spin_unlock(&cifs_tcp_ses_lock);
4948                 rc = -ENOMEM;
4949                 goto error;
4950         }
4951         spin_unlock(&cifs_tcp_ses_lock);
4952
4953         rc = dfs_cache_add_vol(origin_mountdata, vol, cifs_sb->origin_fullpath);
4954         if (rc) {
4955                 kfree(cifs_sb->origin_fullpath);
4956                 goto error;
4957         }
4958         /*
4959          * After reconnecting to a different server, unique ids won't
4960          * match anymore, so we disable serverino. This prevents
4961          * dentry revalidation to think the dentry are stale (ESTALE).
4962          */
4963         cifs_autodisable_serverino(cifs_sb);
4964         /*
4965          * Force the use of prefix path to support failover on DFS paths that
4966          * resolve to targets that have different prefix paths.
4967          */
4968         cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
4969         kfree(cifs_sb->prepath);
4970         cifs_sb->prepath = vol->prepath;
4971         vol->prepath = NULL;
4972
4973 out:
4974         free_xid(xid);
4975         cifs_try_adding_channels(ses);
4976         return mount_setup_tlink(cifs_sb, ses, tcon);
4977
4978 error:
4979         kfree(full_path);
4980         kfree(root_path);
4981         kfree(origin_mountdata);
4982         mount_put_conns(cifs_sb, xid, server, ses, tcon);
4983         return rc;
4984 }
4985 #else
4986 int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
4987 {
4988         int rc = 0;
4989         unsigned int xid;
4990         struct cifs_ses *ses;
4991         struct cifs_tcon *tcon;
4992         struct TCP_Server_Info *server;
4993
4994         rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
4995         if (rc)
4996                 goto error;
4997
4998         if (tcon) {
4999                 rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
5000                 if (rc == -EREMOTE)
5001                         rc = -EOPNOTSUPP;
5002                 if (rc)
5003                         goto error;
5004         }
5005
5006         free_xid(xid);
5007
5008         return mount_setup_tlink(cifs_sb, ses, tcon);
5009
5010 error:
5011         mount_put_conns(cifs_sb, xid, server, ses, tcon);
5012         return rc;
5013 }
5014 #endif
5015
5016 /*
5017  * Issue a TREE_CONNECT request.
5018  */
5019 int
5020 CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
5021          const char *tree, struct cifs_tcon *tcon,
5022          const struct nls_table *nls_codepage)
5023 {
5024         struct smb_hdr *smb_buffer;
5025         struct smb_hdr *smb_buffer_response;
5026         TCONX_REQ *pSMB;
5027         TCONX_RSP *pSMBr;
5028         unsigned char *bcc_ptr;
5029         int rc = 0;
5030         int length;
5031         __u16 bytes_left, count;
5032
5033         if (ses == NULL)
5034                 return -EIO;
5035
5036         smb_buffer = cifs_buf_get();
5037         if (smb_buffer == NULL)
5038                 return -ENOMEM;
5039
5040         smb_buffer_response = smb_buffer;
5041
5042         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
5043                         NULL /*no tid */ , 4 /*wct */ );
5044
5045         smb_buffer->Mid = get_next_mid(ses->server);
5046         smb_buffer->Uid = ses->Suid;
5047         pSMB = (TCONX_REQ *) smb_buffer;
5048         pSMBr = (TCONX_RSP *) smb_buffer_response;
5049
5050         pSMB->AndXCommand = 0xFF;
5051         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
5052         bcc_ptr = &pSMB->Password[0];
5053         if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
5054                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
5055                 *bcc_ptr = 0; /* password is null byte */
5056                 bcc_ptr++;              /* skip password */
5057                 /* already aligned so no need to do it below */
5058         } else {
5059                 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
5060                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
5061                    specified as required (when that support is added to
5062                    the vfs in the future) as only NTLM or the much
5063                    weaker LANMAN (which we do not send by default) is accepted
5064                    by Samba (not sure whether other servers allow
5065                    NTLMv2 password here) */
5066 #ifdef CONFIG_CIFS_WEAK_PW_HASH
5067                 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
5068                     (ses->sectype == LANMAN))
5069                         calc_lanman_hash(tcon->password, ses->server->cryptkey,
5070                                          ses->server->sec_mode &
5071                                             SECMODE_PW_ENCRYPT ? true : false,
5072                                          bcc_ptr);
5073                 else
5074 #endif /* CIFS_WEAK_PW_HASH */
5075                 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
5076                                         bcc_ptr, nls_codepage);
5077                 if (rc) {
5078                         cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
5079                                  __func__, rc);
5080                         cifs_buf_release(smb_buffer);
5081                         return rc;
5082                 }
5083
5084                 bcc_ptr += CIFS_AUTH_RESP_SIZE;
5085                 if (ses->capabilities & CAP_UNICODE) {
5086                         /* must align unicode strings */
5087                         *bcc_ptr = 0; /* null byte password */
5088                         bcc_ptr++;
5089                 }
5090         }
5091
5092         if (ses->server->sign)
5093                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
5094
5095         if (ses->capabilities & CAP_STATUS32) {
5096                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
5097         }
5098         if (ses->capabilities & CAP_DFS) {
5099                 smb_buffer->Flags2 |= SMBFLG2_DFS;
5100         }
5101         if (ses->capabilities & CAP_UNICODE) {
5102                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
5103                 length =
5104                     cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
5105                         6 /* max utf8 char length in bytes */ *
5106                         (/* server len*/ + 256 /* share len */), nls_codepage);
5107                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
5108                 bcc_ptr += 2;   /* skip trailing null */
5109         } else {                /* ASCII */
5110                 strcpy(bcc_ptr, tree);
5111                 bcc_ptr += strlen(tree) + 1;
5112         }
5113         strcpy(bcc_ptr, "?????");
5114         bcc_ptr += strlen("?????");
5115         bcc_ptr += 1;
5116         count = bcc_ptr - &pSMB->Password[0];
5117         pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
5118                                         pSMB->hdr.smb_buf_length) + count);
5119         pSMB->ByteCount = cpu_to_le16(count);
5120
5121         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
5122                          0);
5123
5124         /* above now done in SendReceive */
5125         if (rc == 0) {
5126                 bool is_unicode;
5127
5128                 tcon->tidStatus = CifsGood;
5129                 tcon->need_reconnect = false;
5130                 tcon->tid = smb_buffer_response->Tid;
5131                 bcc_ptr = pByteArea(smb_buffer_response);
5132                 bytes_left = get_bcc(smb_buffer_response);
5133                 length = strnlen(bcc_ptr, bytes_left - 2);
5134                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
5135                         is_unicode = true;
5136                 else
5137                         is_unicode = false;
5138
5139
5140                 /* skip service field (NB: this field is always ASCII) */
5141                 if (length == 3) {
5142                         if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
5143                             (bcc_ptr[2] == 'C')) {
5144                                 cifs_dbg(FYI, "IPC connection\n");
5145                                 tcon->ipc = true;
5146                                 tcon->pipe = true;
5147                         }
5148                 } else if (length == 2) {
5149                         if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
5150                                 /* the most common case */
5151                                 cifs_dbg(FYI, "disk share connection\n");
5152                         }
5153                 }
5154                 bcc_ptr += length + 1;
5155                 bytes_left -= (length + 1);
5156                 strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
5157
5158                 /* mostly informational -- no need to fail on error here */
5159                 kfree(tcon->nativeFileSystem);
5160                 tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
5161                                                       bytes_left, is_unicode,
5162                                                       nls_codepage);
5163
5164                 cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
5165
5166                 if ((smb_buffer_response->WordCount == 3) ||
5167                          (smb_buffer_response->WordCount == 7))
5168                         /* field is in same location */
5169                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
5170                 else
5171                         tcon->Flags = 0;
5172                 cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
5173         }
5174
5175         cifs_buf_release(smb_buffer);
5176         return rc;
5177 }
5178
5179 static void delayed_free(struct rcu_head *p)
5180 {
5181         struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
5182         unload_nls(sbi->local_nls);
5183         kfree(sbi);
5184 }
5185
5186 void
5187 cifs_umount(struct cifs_sb_info *cifs_sb)
5188 {
5189         struct rb_root *root = &cifs_sb->tlink_tree;
5190         struct rb_node *node;
5191         struct tcon_link *tlink;
5192
5193         cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
5194
5195         spin_lock(&cifs_sb->tlink_tree_lock);
5196         while ((node = rb_first(root))) {
5197                 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
5198                 cifs_get_tlink(tlink);
5199                 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
5200                 rb_erase(node, root);
5201
5202                 spin_unlock(&cifs_sb->tlink_tree_lock);
5203                 cifs_put_tlink(tlink);
5204                 spin_lock(&cifs_sb->tlink_tree_lock);
5205         }
5206         spin_unlock(&cifs_sb->tlink_tree_lock);
5207
5208         kfree(cifs_sb->mountdata);
5209         kfree(cifs_sb->prepath);
5210 #ifdef CONFIG_CIFS_DFS_UPCALL
5211         dfs_cache_del_vol(cifs_sb->origin_fullpath);
5212         kfree(cifs_sb->origin_fullpath);
5213 #endif
5214         call_rcu(&cifs_sb->rcu, delayed_free);
5215 }
5216
5217 int
5218 cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
5219 {
5220         int rc = 0;
5221         struct TCP_Server_Info *server = cifs_ses_server(ses);
5222
5223         if (!server->ops->need_neg || !server->ops->negotiate)
5224                 return -ENOSYS;
5225
5226         /* only send once per connect */
5227         if (!server->ops->need_neg(server))
5228                 return 0;
5229
5230         rc = server->ops->negotiate(xid, ses);
5231         if (rc == 0) {
5232                 spin_lock(&GlobalMid_Lock);
5233                 if (server->tcpStatus == CifsNeedNegotiate)
5234                         server->tcpStatus = CifsGood;
5235                 else
5236                         rc = -EHOSTDOWN;
5237                 spin_unlock(&GlobalMid_Lock);
5238         }
5239
5240         return rc;
5241 }
5242
5243 int
5244 cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
5245                    struct nls_table *nls_info)
5246 {
5247         int rc = -ENOSYS;
5248         struct TCP_Server_Info *server = cifs_ses_server(ses);
5249
5250         if (!ses->binding) {
5251                 ses->capabilities = server->capabilities;
5252                 if (linuxExtEnabled == 0)
5253                         ses->capabilities &= (~server->vals->cap_unix);
5254
5255                 if (ses->auth_key.response) {
5256                         cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
5257                                  ses->auth_key.response);
5258                         kfree(ses->auth_key.response);
5259                         ses->auth_key.response = NULL;
5260                         ses->auth_key.len = 0;
5261                 }
5262         }
5263
5264         cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
5265                  server->sec_mode, server->capabilities, server->timeAdj);
5266
5267         if (server->ops->sess_setup)
5268                 rc = server->ops->sess_setup(xid, ses, nls_info);
5269
5270         if (rc)
5271                 cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
5272
5273         return rc;
5274 }
5275
5276 static int
5277 cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
5278 {
5279         vol->sectype = ses->sectype;
5280
5281         /* krb5 is special, since we don't need username or pw */
5282         if (vol->sectype == Kerberos)
5283                 return 0;
5284
5285         return cifs_set_cifscreds(vol, ses);
5286 }
5287
5288 static struct cifs_tcon *
5289 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
5290 {
5291         int rc;
5292         struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
5293         struct cifs_ses *ses;
5294         struct cifs_tcon *tcon = NULL;
5295         struct smb_vol *vol_info;
5296
5297         vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
5298         if (vol_info == NULL)
5299                 return ERR_PTR(-ENOMEM);
5300
5301         vol_info->local_nls = cifs_sb->local_nls;
5302         vol_info->linux_uid = fsuid;
5303         vol_info->cred_uid = fsuid;
5304         vol_info->UNC = master_tcon->treeName;
5305         vol_info->retry = master_tcon->retry;
5306         vol_info->nocase = master_tcon->nocase;
5307         vol_info->nohandlecache = master_tcon->nohandlecache;
5308         vol_info->local_lease = master_tcon->local_lease;
5309         vol_info->no_lease = master_tcon->no_lease;
5310         vol_info->resilient = master_tcon->use_resilient;
5311         vol_info->persistent = master_tcon->use_persistent;
5312         vol_info->handle_timeout = master_tcon->handle_timeout;
5313         vol_info->no_linux_ext = !master_tcon->unix_ext;
5314         vol_info->linux_ext = master_tcon->posix_extensions;
5315         vol_info->sectype = master_tcon->ses->sectype;
5316         vol_info->sign = master_tcon->ses->sign;
5317         vol_info->seal = master_tcon->seal;
5318
5319         rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
5320         if (rc) {
5321                 tcon = ERR_PTR(rc);
5322                 goto out;
5323         }
5324
5325         /* get a reference for the same TCP session */
5326         spin_lock(&cifs_tcp_ses_lock);
5327         ++master_tcon->ses->server->srv_count;
5328         spin_unlock(&cifs_tcp_ses_lock);
5329
5330         ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
5331         if (IS_ERR(ses)) {
5332                 tcon = (struct cifs_tcon *)ses;
5333                 cifs_put_tcp_session(master_tcon->ses->server, 0);
5334                 goto out;
5335         }
5336
5337         tcon = cifs_get_tcon(ses, vol_info);
5338         if (IS_ERR(tcon)) {
5339                 cifs_put_smb_ses(ses);
5340                 goto out;
5341         }
5342
5343         if (cap_unix(ses))
5344                 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
5345
5346 out:
5347         kfree(vol_info->username);
5348         kzfree(vol_info->password);
5349         kfree(vol_info);
5350
5351         return tcon;
5352 }
5353
5354 struct cifs_tcon *
5355 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
5356 {
5357         return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
5358 }
5359
5360 /* find and return a tlink with given uid */
5361 static struct tcon_link *
5362 tlink_rb_search(struct rb_root *root, kuid_t uid)
5363 {
5364         struct rb_node *node = root->rb_node;
5365         struct tcon_link *tlink;
5366
5367         while (node) {
5368                 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
5369
5370                 if (uid_gt(tlink->tl_uid, uid))
5371                         node = node->rb_left;
5372                 else if (uid_lt(tlink->tl_uid, uid))
5373                         node = node->rb_right;
5374                 else
5375                         return tlink;
5376         }
5377         return NULL;
5378 }
5379
5380 /* insert a tcon_link into the tree */
5381 static void
5382 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
5383 {
5384         struct rb_node **new = &(root->rb_node), *parent = NULL;
5385         struct tcon_link *tlink;
5386
5387         while (*new) {
5388                 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
5389                 parent = *new;
5390
5391                 if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
5392                         new = &((*new)->rb_left);
5393                 else
5394                         new = &((*new)->rb_right);
5395         }
5396
5397         rb_link_node(&new_tlink->tl_rbnode, parent, new);
5398         rb_insert_color(&new_tlink->tl_rbnode, root);
5399 }
5400
5401 /*
5402  * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
5403  * current task.
5404  *
5405  * If the superblock doesn't refer to a multiuser mount, then just return
5406  * the master tcon for the mount.
5407  *
5408  * First, search the rbtree for an existing tcon for this fsuid. If one
5409  * exists, then check to see if it's pending construction. If it is then wait
5410  * for construction to complete. Once it's no longer pending, check to see if
5411  * it failed and either return an error or retry construction, depending on
5412  * the timeout.
5413  *
5414  * If one doesn't exist then insert a new tcon_link struct into the tree and
5415  * try to construct a new one.
5416  */
5417 struct tcon_link *
5418 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
5419 {
5420         int ret;
5421         kuid_t fsuid = current_fsuid();
5422         struct tcon_link *tlink, *newtlink;
5423
5424         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
5425                 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
5426
5427         spin_lock(&cifs_sb->tlink_tree_lock);
5428         tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
5429         if (tlink)
5430                 cifs_get_tlink(tlink);
5431         spin_unlock(&cifs_sb->tlink_tree_lock);
5432
5433         if (tlink == NULL) {
5434                 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
5435                 if (newtlink == NULL)
5436                         return ERR_PTR(-ENOMEM);
5437                 newtlink->tl_uid = fsuid;
5438                 newtlink->tl_tcon = ERR_PTR(-EACCES);
5439                 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
5440                 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
5441                 cifs_get_tlink(newtlink);
5442
5443                 spin_lock(&cifs_sb->tlink_tree_lock);
5444                 /* was one inserted after previous search? */
5445                 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
5446                 if (tlink) {
5447                         cifs_get_tlink(tlink);
5448                         spin_unlock(&cifs_sb->tlink_tree_lock);
5449                         kfree(newtlink);
5450                         goto wait_for_construction;
5451                 }
5452                 tlink = newtlink;
5453                 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
5454                 spin_unlock(&cifs_sb->tlink_tree_lock);
5455         } else {
5456 wait_for_construction:
5457                 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
5458                                   TASK_INTERRUPTIBLE);
5459                 if (ret) {
5460                         cifs_put_tlink(tlink);
5461                         return ERR_PTR(-ERESTARTSYS);
5462                 }
5463
5464                 /* if it's good, return it */
5465                 if (!IS_ERR(tlink->tl_tcon))
5466                         return tlink;
5467
5468                 /* return error if we tried this already recently */
5469                 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
5470                         cifs_put_tlink(tlink);
5471                         return ERR_PTR(-EACCES);
5472                 }
5473
5474                 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
5475                         goto wait_for_construction;
5476         }
5477
5478         tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
5479         clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
5480         wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
5481
5482         if (IS_ERR(tlink->tl_tcon)) {
5483                 cifs_put_tlink(tlink);
5484                 return ERR_PTR(-EACCES);
5485         }
5486
5487         return tlink;
5488 }
5489
5490 /*
5491  * periodic workqueue job that scans tcon_tree for a superblock and closes
5492  * out tcons.
5493  */
5494 static void
5495 cifs_prune_tlinks(struct work_struct *work)
5496 {
5497         struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
5498                                                     prune_tlinks.work);
5499         struct rb_root *root = &cifs_sb->tlink_tree;
5500         struct rb_node *node;
5501         struct rb_node *tmp;
5502         struct tcon_link *tlink;
5503
5504         /*
5505          * Because we drop the spinlock in the loop in order to put the tlink
5506          * it's not guarded against removal of links from the tree. The only
5507          * places that remove entries from the tree are this function and
5508          * umounts. Because this function is non-reentrant and is canceled
5509          * before umount can proceed, this is safe.
5510          */
5511         spin_lock(&cifs_sb->tlink_tree_lock);
5512         node = rb_first(root);
5513         while (node != NULL) {
5514                 tmp = node;
5515                 node = rb_next(tmp);
5516                 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
5517
5518                 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
5519                     atomic_read(&tlink->tl_count) != 0 ||
5520                     time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
5521                         continue;
5522
5523                 cifs_get_tlink(tlink);
5524                 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
5525                 rb_erase(tmp, root);
5526
5527                 spin_unlock(&cifs_sb->tlink_tree_lock);
5528                 cifs_put_tlink(tlink);
5529                 spin_lock(&cifs_sb->tlink_tree_lock);
5530         }
5531         spin_unlock(&cifs_sb->tlink_tree_lock);
5532
5533         queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
5534                                 TLINK_IDLE_EXPIRE);
5535 }