fs/smb/client/smb2pdu.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  */
  12
  13  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  14  /* Note that there are handle based routines which must be                   */
  15  /* treated slightly differently for reconnection purposes since we never     */
  16  /* want to reuse a stale file handle and only the caller knows the file info */
  17
  18 #include <linux/fs.h>
  19 #include <linux/kernel.h>
  20 #include <linux/vfs.h>
  21 #include <linux/task_io_accounting_ops.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/uuid.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/xattr.h>
  26 #include "cifsglob.h"
  27 #include "cifsacl.h"
  28 #include "cifsproto.h"
  29 #include "smb2proto.h"
  30 #include "cifs_unicode.h"
  31 #include "cifs_debug.h"
  32 #include "ntlmssp.h"
  33 #include "smb2status.h"
  34 #include "smb2glob.h"
  35 #include "cifspdu.h"
  36 #include "cifs_spnego.h"
  37 #include "smbdirect.h"
  38 #include "trace.h"
  39 #ifdef CONFIG_CIFS_DFS_UPCALL
  40 #include "dfs_cache.h"
  41 #endif
  42 #include "cached_dir.h"
  43
  44 /*
  45  *  The following table defines the expected "StructureSize" of SMB2 requests
  46  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  47  *
  48  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  49  *  indexed by command in host byte order.
  50  */
  51 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  52         /* SMB2_NEGOTIATE */ 36,
  53         /* SMB2_SESSION_SETUP */ 25,
  54         /* SMB2_LOGOFF */ 4,
  55         /* SMB2_TREE_CONNECT */ 9,
  56         /* SMB2_TREE_DISCONNECT */ 4,
  57         /* SMB2_CREATE */ 57,
  58         /* SMB2_CLOSE */ 24,
  59         /* SMB2_FLUSH */ 24,
  60         /* SMB2_READ */ 49,
  61         /* SMB2_WRITE */ 49,
  62         /* SMB2_LOCK */ 48,
  63         /* SMB2_IOCTL */ 57,
  64         /* SMB2_CANCEL */ 4,
  65         /* SMB2_ECHO */ 4,
  66         /* SMB2_QUERY_DIRECTORY */ 33,
  67         /* SMB2_CHANGE_NOTIFY */ 32,
  68         /* SMB2_QUERY_INFO */ 41,
  69         /* SMB2_SET_INFO */ 33,
  70         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  71 };
  72
  73 int smb3_encryption_required(const struct cifs_tcon *tcon)
  74 {
  75         if (!tcon || !tcon->ses)
  76                 return 0;
  77         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  78             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  79                 return 1;
  80         if (tcon->seal &&
  81             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  82                 return 1;
  83         return 0;
  84 }
  85
  86 static void
  87 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
  88                   const struct cifs_tcon *tcon,
  89                   struct TCP_Server_Info *server)
  90 {
  91         struct smb3_hdr_req *smb3_hdr;
  92
  93         shdr->ProtocolId = SMB2_PROTO_NUMBER;
  94         shdr->StructureSize = cpu_to_le16(64);
  95         shdr->Command = smb2_cmd;
  96
  97         if (server) {
  98                 /* After reconnect SMB3 must set ChannelSequence on subsequent reqs */
  99                 if (server->dialect >= SMB30_PROT_ID) {
 100                         smb3_hdr = (struct smb3_hdr_req *)shdr;
 101                         /*
 102                          * if primary channel is not set yet, use default
 103                          * channel for chan sequence num
 104                          */
 105                         if (SERVER_IS_CHAN(server))
 106                                 smb3_hdr->ChannelSequence =
 107                                         cpu_to_le16(server->primary_server->channel_sequence_num);
 108                         else
 109                                 smb3_hdr->ChannelSequence =
 110                                         cpu_to_le16(server->channel_sequence_num);
 111                 }
 112                 spin_lock(&server->req_lock);
 113                 /* Request up to 10 credits but don't go over the limit. */
 114                 if (server->credits >= server->max_credits)
 115                         shdr->CreditRequest = cpu_to_le16(0);
 116                 else
 117                         shdr->CreditRequest = cpu_to_le16(
 118                                 min_t(int, server->max_credits -
 119                                                 server->credits, 10));
 120                 spin_unlock(&server->req_lock);
 121         } else {
 122                 shdr->CreditRequest = cpu_to_le16(2);
 123         }
 124         shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
 125
 126         if (!tcon)
 127                 goto out;
 128
 129         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 130         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 131         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 132                 shdr->CreditCharge = cpu_to_le16(1);
 133         /* else CreditCharge MBZ */
 134
 135         shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
 136         /* Uid is not converted */
 137         if (tcon->ses)
 138                 shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
 139
 140         /*
 141          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 142          * to pass the path on the Open SMB prefixed by \\server\share.
 143          * Not sure when we would need to do the augmented path (if ever) and
 144          * setting this flag breaks the SMB2 open operation since it is
 145          * illegal to send an empty path name (without \\server\share prefix)
 146          * when the DFS flag is set in the SMB open header. We could
 147          * consider setting the flag on all operations other than open
 148          * but it is safer to net set it for now.
 149          */
 150 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 151                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 152
 153         if (server && server->sign && !smb3_encryption_required(tcon))
 154                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 155 out:
 156         return;
 157 }
 158
 159 /* helper function for code reuse */
 160 static int
 161 cifs_chan_skip_or_disable(struct cifs_ses *ses,
 162                           struct TCP_Server_Info *server,
 163                           bool from_reconnect)
 164 {
 165         struct TCP_Server_Info *pserver;
 166         unsigned int chan_index;
 167
 168         if (SERVER_IS_CHAN(server)) {
 169                 cifs_dbg(VFS,
 170                         "server %s does not support multichannel anymore. Skip secondary channel\n",
 171                          ses->server->hostname);
 172
 173                 spin_lock(&ses->chan_lock);
 174                 chan_index = cifs_ses_get_chan_index(ses, server);
 175                 if (chan_index == CIFS_INVAL_CHAN_INDEX) {
 176                         spin_unlock(&ses->chan_lock);
 177                         goto skip_terminate;
 178                 }
 179
 180                 ses->chans[chan_index].server = NULL;
 181                 server->terminate = true;
 182                 spin_unlock(&ses->chan_lock);
 183
 184                 /*
 185                  * the above reference of server by channel
 186                  * needs to be dropped without holding chan_lock
 187                  * as cifs_put_tcp_session takes a higher lock
 188                  * i.e. cifs_tcp_ses_lock
 189                  */
 190                 cifs_put_tcp_session(server, from_reconnect);
 191
 192                 cifs_signal_cifsd_for_reconnect(server, false);
 193
 194                 /* mark primary server as needing reconnect */
 195                 pserver = server->primary_server;
 196                 cifs_signal_cifsd_for_reconnect(pserver, false);
 197 skip_terminate:
 198                 return -EHOSTDOWN;
 199         }
 200
 201         cifs_server_dbg(VFS,
 202                 "server does not support multichannel anymore. Disable all other channels\n");
 203         cifs_disable_secondary_channels(ses);
 204
 205
 206         return 0;
 207 }
 208
 209 static int
 210 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 211                struct TCP_Server_Info *server, bool from_reconnect)
 212 {
 213         int rc = 0;
 214         struct nls_table *nls_codepage = NULL;
 215         struct cifs_ses *ses;
 216         int xid;
 217
 218         /*
 219          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 220          * check for tcp and smb session status done differently
 221          * for those three - in the calling routine.
 222          */
 223         if (tcon == NULL)
 224                 return 0;
 225
 226         /*
 227          * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in
 228          * cifs_tree_connect().
 229          */
 230         if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL)
 231                 return 0;
 232
 233         spin_lock(&tcon->tc_lock);
 234         if (tcon->status == TID_EXITING) {
 235                 /*
 236                  * only tree disconnect allowed when disconnecting ...
 237                  */
 238                 if (smb2_command != SMB2_TREE_DISCONNECT) {
 239                         spin_unlock(&tcon->tc_lock);
 240                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 241                                  smb2_command);
 242                         return -ENODEV;
 243                 }
 244         }
 245         spin_unlock(&tcon->tc_lock);
 246
 247         ses = tcon->ses;
 248         if (!ses)
 249                 return -EIO;
 250         spin_lock(&ses->ses_lock);
 251         if (ses->ses_status == SES_EXITING) {
 252                 spin_unlock(&ses->ses_lock);
 253                 return -EIO;
 254         }
 255         spin_unlock(&ses->ses_lock);
 256         if (!ses->server || !server)
 257                 return -EIO;
 258
 259         spin_lock(&server->srv_lock);
 260         if (server->tcpStatus == CifsNeedReconnect) {
 261                 /*
 262                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 263                  * here since they are implicitly done when session drops.
 264                  */
 265                 switch (smb2_command) {
 266                 /*
 267                  * BB Should we keep oplock break and add flush to exceptions?
 268                  */
 269                 case SMB2_TREE_DISCONNECT:
 270                 case SMB2_CANCEL:
 271                 case SMB2_CLOSE:
 272                 case SMB2_OPLOCK_BREAK:
 273                         spin_unlock(&server->srv_lock);
 274                         return -EAGAIN;
 275                 }
 276         }
 277
 278         /* if server is marked for termination, cifsd will cleanup */
 279         if (server->terminate) {
 280                 spin_unlock(&server->srv_lock);
 281                 return -EHOSTDOWN;
 282         }
 283         spin_unlock(&server->srv_lock);
 284
 285 again:
 286         rc = cifs_wait_for_server_reconnect(server, tcon->retry);
 287         if (rc)
 288                 return rc;
 289
 290         spin_lock(&ses->chan_lock);
 291         if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
 292                 spin_unlock(&ses->chan_lock);
 293                 return 0;
 294         }
 295         spin_unlock(&ses->chan_lock);
 296         cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
 297                  tcon->ses->chans_need_reconnect,
 298                  tcon->need_reconnect);
 299
 300         mutex_lock(&ses->session_mutex);
 301         /*
 302          * if this is called by delayed work, and the channel has been disabled
 303          * in parallel, the delayed work can continue to execute in parallel
 304          * there's a chance that this channel may not exist anymore
 305          */
 306         spin_lock(&server->srv_lock);
 307         if (server->tcpStatus == CifsExiting) {
 308                 spin_unlock(&server->srv_lock);
 309                 mutex_unlock(&ses->session_mutex);
 310                 rc = -EHOSTDOWN;
 311                 goto out;
 312         }
 313
 314         /*
 315          * Recheck after acquire mutex. If another thread is negotiating
 316          * and the server never sends an answer the socket will be closed
 317          * and tcpStatus set to reconnect.
 318          */
 319         if (server->tcpStatus == CifsNeedReconnect) {
 320                 spin_unlock(&server->srv_lock);
 321                 mutex_unlock(&ses->session_mutex);
 322
 323                 if (tcon->retry)
 324                         goto again;
 325
 326                 rc = -EHOSTDOWN;
 327                 goto out;
 328         }
 329         spin_unlock(&server->srv_lock);
 330
 331         nls_codepage = ses->local_nls;
 332
 333         /*
 334          * need to prevent multiple threads trying to simultaneously
 335          * reconnect the same SMB session
 336          */
 337         spin_lock(&ses->ses_lock);
 338         spin_lock(&ses->chan_lock);
 339         if (!cifs_chan_needs_reconnect(ses, server) &&
 340             ses->ses_status == SES_GOOD) {
 341                 spin_unlock(&ses->chan_lock);
 342                 spin_unlock(&ses->ses_lock);
 343                 /* this means that we only need to tree connect */
 344                 if (tcon->need_reconnect)
 345                         goto skip_sess_setup;
 346
 347                 mutex_unlock(&ses->session_mutex);
 348                 goto out;
 349         }
 350         spin_unlock(&ses->chan_lock);
 351         spin_unlock(&ses->ses_lock);
 352
 353         rc = cifs_negotiate_protocol(0, ses, server);
 354         if (!rc) {
 355                 /*
 356                  * if server stopped supporting multichannel
 357                  * and the first channel reconnected, disable all the others.
 358                  */
 359                 if (ses->chan_count > 1 &&
 360                     !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
 361                         rc = cifs_chan_skip_or_disable(ses, server,
 362                                                        from_reconnect);
 363                         if (rc) {
 364                                 mutex_unlock(&ses->session_mutex);
 365                                 goto out;
 366                         }
 367                 }
 368
 369                 rc = cifs_setup_session(0, ses, server, nls_codepage);
 370                 if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
 371                         /*
 372                          * Try alternate password for next reconnect (key rotation
 373                          * could be enabled on the server e.g.) if an alternate
 374                          * password is available and the current password is expired,
 375                          * but do not swap on non pwd related errors like host down
 376                          */
 377                         if (ses->password2)
 378                                 swap(ses->password2, ses->password);
 379                 }
 380
 381                 if ((rc == -EACCES) && !tcon->retry) {
 382                         mutex_unlock(&ses->session_mutex);
 383                         rc = -EHOSTDOWN;
 384                         goto failed;
 385                 } else if (rc) {
 386                         mutex_unlock(&ses->session_mutex);
 387                         goto out;
 388                 }
 389         } else {
 390                 mutex_unlock(&ses->session_mutex);
 391                 goto out;
 392         }
 393
 394 skip_sess_setup:
 395         if (!tcon->need_reconnect) {
 396                 mutex_unlock(&ses->session_mutex);
 397                 goto out;
 398         }
 399         cifs_mark_open_files_invalid(tcon);
 400         if (tcon->use_persistent)
 401                 tcon->need_reopen_files = true;
 402
 403         rc = cifs_tree_connect(0, tcon, nls_codepage);
 404
 405         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 406         if (rc) {
 407                 /* If sess reconnected but tcon didn't, something strange ... */
 408                 mutex_unlock(&ses->session_mutex);
 409                 cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
 410                 goto out;
 411         }
 412
 413         spin_lock(&ses->ses_lock);
 414         if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) {
 415                 spin_unlock(&ses->ses_lock);
 416                 mutex_unlock(&ses->session_mutex);
 417                 goto skip_add_channels;
 418         }
 419         ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS;
 420         spin_unlock(&ses->ses_lock);
 421
 422         if (!rc &&
 423             (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) &&
 424             server->ops->query_server_interfaces) {
 425                 mutex_unlock(&ses->session_mutex);
 426
 427                 /*
 428                  * query server network interfaces, in case they change
 429                  */
 430                 xid = get_xid();
 431                 rc = server->ops->query_server_interfaces(xid, tcon, false);
 432                 free_xid(xid);
 433
 434                 if (rc == -EOPNOTSUPP && ses->chan_count > 1) {
 435                         /*
 436                          * some servers like Azure SMB server do not advertise
 437                          * that multichannel has been disabled with server
 438                          * capabilities, rather return STATUS_NOT_IMPLEMENTED.
 439                          * treat this as server not supporting multichannel
 440                          */
 441
 442                         rc = cifs_chan_skip_or_disable(ses, server,
 443                                                        from_reconnect);
 444                         goto skip_add_channels;
 445                 } else if (rc)
 446                         cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
 447                                  __func__, rc);
 448
 449                 if (ses->chan_max > ses->chan_count &&
 450                     ses->iface_count &&
 451                     !SERVER_IS_CHAN(server)) {
 452                         if (ses->chan_count == 1) {
 453                                 cifs_server_dbg(VFS, "supports multichannel now\n");
 454                                 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
 455                                                  (SMB_INTERFACE_POLL_INTERVAL * HZ));
 456                         }
 457
 458                         cifs_try_adding_channels(ses);
 459                 }
 460         } else {
 461                 mutex_unlock(&ses->session_mutex);
 462         }
 463
 464 skip_add_channels:
 465         spin_lock(&ses->ses_lock);
 466         ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS;
 467         spin_unlock(&ses->ses_lock);
 468
 469         if (smb2_command != SMB2_INTERNAL_CMD)
 470                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 471
 472         atomic_inc(&tconInfoReconnectCount);
 473 out:
 474         /*
 475          * Check if handle based operation so we know whether we can continue
 476          * or not without returning to caller to reset file handle.
 477          */
 478         /*
 479          * BB Is flush done by server on drop of tcp session? Should we special
 480          * case it and skip above?
 481          */
 482         switch (smb2_command) {
 483         case SMB2_FLUSH:
 484         case SMB2_READ:
 485         case SMB2_WRITE:
 486         case SMB2_LOCK:
 487         case SMB2_QUERY_DIRECTORY:
 488         case SMB2_CHANGE_NOTIFY:
 489         case SMB2_QUERY_INFO:
 490         case SMB2_SET_INFO:
 491                 rc = -EAGAIN;
 492         }
 493 failed:
 494         return rc;
 495 }
 496
 497 static void
 498 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 499                struct TCP_Server_Info *server,
 500                void *buf,
 501                unsigned int *total_len)
 502 {
 503         struct smb2_pdu *spdu = buf;
 504         /* lookup word count ie StructureSize from table */
 505         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 506
 507         /*
 508          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 509          * largest operations (Create)
 510          */
 511         memset(buf, 0, 256);
 512
 513         smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
 514         spdu->StructureSize2 = cpu_to_le16(parmsize);
 515
 516         *total_len = parmsize + sizeof(struct smb2_hdr);
 517 }
 518
 519 /*
 520  * Allocate and return pointer to an SMB request hdr, and set basic
 521  * SMB information in the SMB header. If the return code is zero, this
 522  * function must have filled in request_buf pointer.
 523  */
 524 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 525                                  struct TCP_Server_Info *server,
 526                                  void **request_buf, unsigned int *total_len)
 527 {
 528         /* BB eventually switch this to SMB2 specific small buf size */
 529         switch (smb2_command) {
 530         case SMB2_SET_INFO:
 531         case SMB2_QUERY_INFO:
 532                 *request_buf = cifs_buf_get();
 533                 break;
 534         default:
 535                 *request_buf = cifs_small_buf_get();
 536                 break;
 537         }
 538         if (*request_buf == NULL) {
 539                 /* BB should we add a retry in here if not a writepage? */
 540                 return -ENOMEM;
 541         }
 542
 543         fill_small_buf(smb2_command, tcon, server,
 544                        (struct smb2_hdr *)(*request_buf),
 545                        total_len);
 546
 547         if (tcon != NULL) {
 548                 uint16_t com_code = le16_to_cpu(smb2_command);
 549                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 550                 cifs_stats_inc(&tcon->num_smbs_sent);
 551         }
 552
 553         return 0;
 554 }
 555
 556 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 557                                struct TCP_Server_Info *server,
 558                                void **request_buf, unsigned int *total_len)
 559 {
 560         int rc;
 561
 562         rc = smb2_reconnect(smb2_command, tcon, server, false);
 563         if (rc)
 564                 return rc;
 565
 566         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 567                                      total_len);
 568 }
 569
 570 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 571                                struct TCP_Server_Info *server,
 572                                void **request_buf, unsigned int *total_len)
 573 {
 574         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 575         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 576                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 577                                              request_buf, total_len);
 578         }
 579         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 580                                    request_buf, total_len);
 581 }
 582
 583 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 584
 585 static void
 586 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 587 {
 588         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 589         pneg_ctxt->DataLength = cpu_to_le16(38);
 590         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 591         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 592         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 593         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 594 }
 595
 596 static void
 597 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 598 {
 599         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 600         pneg_ctxt->DataLength =
 601                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 602                           - sizeof(struct smb2_neg_context));
 603         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 604         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 605         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 606         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 607 }
 608
 609 static unsigned int
 610 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
 611 {
 612         unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
 613         unsigned short num_algs = 1; /* number of signing algorithms sent */
 614
 615         pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
 616         /*
 617          * Context Data length must be rounded to multiple of 8 for some servers
 618          */
 619         pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
 620                                             sizeof(struct smb2_neg_context) +
 621                                             (num_algs * sizeof(u16)), 8));
 622         pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
 623         pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
 624
 625         ctxt_len += sizeof(__le16) * num_algs;
 626         ctxt_len = ALIGN(ctxt_len, 8);
 627         return ctxt_len;
 628         /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
 629 }
 630
 631 static void
 632 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 633 {
 634         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 635         if (require_gcm_256) {
 636                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 637                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 638                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 639         } else if (enable_gcm_256) {
 640                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 641                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 642                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 643                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 644                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 645         } else {
 646                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 647                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 648                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 649                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 650         }
 651 }
 652
 653 static unsigned int
 654 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 655 {
 656         struct nls_table *cp = load_nls_default();
 657
 658         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 659
 660         /* copy up to max of first 100 bytes of server name to NetName field */
 661         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 662         /* context size is DataLength + minimal smb2_neg_context */
 663         return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
 664 }
 665
 666 static void
 667 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 668 {
 669         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 670         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 671         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 672         pneg_ctxt->Name[0] = 0x93;
 673         pneg_ctxt->Name[1] = 0xAD;
 674         pneg_ctxt->Name[2] = 0x25;
 675         pneg_ctxt->Name[3] = 0x50;
 676         pneg_ctxt->Name[4] = 0x9C;
 677         pneg_ctxt->Name[5] = 0xB4;
 678         pneg_ctxt->Name[6] = 0x11;
 679         pneg_ctxt->Name[7] = 0xE7;
 680         pneg_ctxt->Name[8] = 0xB4;
 681         pneg_ctxt->Name[9] = 0x23;
 682         pneg_ctxt->Name[10] = 0x83;
 683         pneg_ctxt->Name[11] = 0xDE;
 684         pneg_ctxt->Name[12] = 0x96;
 685         pneg_ctxt->Name[13] = 0x8B;
 686         pneg_ctxt->Name[14] = 0xCD;
 687         pneg_ctxt->Name[15] = 0x7C;
 688 }
 689
 690 static void
 691 assemble_neg_contexts(struct smb2_negotiate_req *req,
 692                       struct TCP_Server_Info *server, unsigned int *total_len)
 693 {
 694         unsigned int ctxt_len, neg_context_count;
 695         struct TCP_Server_Info *pserver;
 696         char *pneg_ctxt;
 697         char *hostname;
 698
 699         if (*total_len > 200) {
 700                 /* In case length corrupted don't want to overrun smb buffer */
 701                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 702                 return;
 703         }
 704
 705         /*
 706          * round up total_len of fixed part of SMB3 negotiate request to 8
 707          * byte boundary before adding negotiate contexts
 708          */
 709         *total_len = ALIGN(*total_len, 8);
 710
 711         pneg_ctxt = (*total_len) + (char *)req;
 712         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 713
 714         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 715         ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
 716         *total_len += ctxt_len;
 717         pneg_ctxt += ctxt_len;
 718
 719         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 720         ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
 721         *total_len += ctxt_len;
 722         pneg_ctxt += ctxt_len;
 723
 724         /*
 725          * secondary channels don't have the hostname field populated
 726          * use the hostname field in the primary channel instead
 727          */
 728         pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
 729         cifs_server_lock(pserver);
 730         hostname = pserver->hostname;
 731         if (hostname && (hostname[0] != 0)) {
 732                 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 733                                               hostname);
 734                 *total_len += ctxt_len;
 735                 pneg_ctxt += ctxt_len;
 736                 neg_context_count = 3;
 737         } else
 738                 neg_context_count = 2;
 739         cifs_server_unlock(pserver);
 740
 741         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 742         *total_len += sizeof(struct smb2_posix_neg_context);
 743         pneg_ctxt += sizeof(struct smb2_posix_neg_context);
 744         neg_context_count++;
 745
 746         if (server->compression.requested) {
 747                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 748                                 pneg_ctxt);
 749                 ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
 750                 *total_len += ctxt_len;
 751                 pneg_ctxt += ctxt_len;
 752                 neg_context_count++;
 753         }
 754
 755         if (enable_negotiate_signing) {
 756                 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
 757                                 pneg_ctxt);
 758                 *total_len += ctxt_len;
 759                 pneg_ctxt += ctxt_len;
 760                 neg_context_count++;
 761         }
 762
 763         /* check for and add transport_capabilities and signing capabilities */
 764         req->NegotiateContextCount = cpu_to_le16(neg_context_count);
 765
 766 }
 767
 768 /* If invalid preauth context warn but use what we requested, SHA-512 */
 769 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 770 {
 771         unsigned int len = le16_to_cpu(ctxt->DataLength);
 772
 773         /*
 774          * Caller checked that DataLength remains within SMB boundary. We still
 775          * need to confirm that one HashAlgorithms member is accounted for.
 776          */
 777         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 778                 pr_warn_once("server sent bad preauth context\n");
 779                 return;
 780         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 781                 pr_warn_once("server sent invalid SaltLength\n");
 782                 return;
 783         }
 784         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 785                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 786         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 787                 pr_warn_once("unknown SMB3 hash algorithm\n");
 788 }
 789
 790 static void decode_compress_ctx(struct TCP_Server_Info *server,
 791                          struct smb2_compression_capabilities_context *ctxt)
 792 {
 793         unsigned int len = le16_to_cpu(ctxt->DataLength);
 794         __le16 alg;
 795
 796         server->compression.enabled = false;
 797
 798         /*
 799          * Caller checked that DataLength remains within SMB boundary. We still
 800          * need to confirm that one CompressionAlgorithms member is accounted
 801          * for.
 802          */
 803         if (len < 10) {
 804                 pr_warn_once("server sent bad compression cntxt\n");
 805                 return;
 806         }
 807
 808         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 809                 pr_warn_once("invalid SMB3 compress algorithm count\n");
 810                 return;
 811         }
 812
 813         alg = ctxt->CompressionAlgorithms[0];
 814
 815         /* 'NONE' (0) compressor type is never negotiated */
 816         if (alg == 0 || le16_to_cpu(alg) > 3) {
 817                 pr_warn_once("invalid compression algorithm '%u'\n", alg);
 818                 return;
 819         }
 820
 821         server->compression.alg = alg;
 822         server->compression.enabled = true;
 823 }
 824
 825 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 826                               struct smb2_encryption_neg_context *ctxt)
 827 {
 828         unsigned int len = le16_to_cpu(ctxt->DataLength);
 829
 830         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 831         /*
 832          * Caller checked that DataLength remains within SMB boundary. We still
 833          * need to confirm that one Cipher flexible array member is accounted
 834          * for.
 835          */
 836         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 837                 pr_warn_once("server sent bad crypto ctxt len\n");
 838                 return -EINVAL;
 839         }
 840
 841         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 842                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 843                 return -EINVAL;
 844         }
 845         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 846         if (require_gcm_256) {
 847                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 848                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 849                         return -EOPNOTSUPP;
 850                 }
 851         } else if (ctxt->Ciphers[0] == 0) {
 852                 /*
 853                  * e.g. if server only supported AES256_CCM (very unlikely)
 854                  * or server supported no encryption types or had all disabled.
 855                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 856                  * in which mount requested encryption ("seal") checks later
 857                  * on during tree connection will return proper rc, but if
 858                  * seal not requested by client, since server is allowed to
 859                  * return 0 to indicate no supported cipher, we can't fail here
 860                  */
 861                 server->cipher_type = 0;
 862                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 863                 pr_warn_once("Server does not support requested encryption types\n");
 864                 return 0;
 865         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 866                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 867                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 868                 /* server returned a cipher we didn't ask for */
 869                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 870                 return -EINVAL;
 871         }
 872         server->cipher_type = ctxt->Ciphers[0];
 873         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 874         return 0;
 875 }
 876
 877 static void decode_signing_ctx(struct TCP_Server_Info *server,
 878                                struct smb2_signing_capabilities *pctxt)
 879 {
 880         unsigned int len = le16_to_cpu(pctxt->DataLength);
 881
 882         /*
 883          * Caller checked that DataLength remains within SMB boundary. We still
 884          * need to confirm that one SigningAlgorithms flexible array member is
 885          * accounted for.
 886          */
 887         if ((len < 4) || (len > 16)) {
 888                 pr_warn_once("server sent bad signing negcontext\n");
 889                 return;
 890         }
 891         if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
 892                 pr_warn_once("Invalid signing algorithm count\n");
 893                 return;
 894         }
 895         if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
 896                 pr_warn_once("unknown signing algorithm\n");
 897                 return;
 898         }
 899
 900         server->signing_negotiated = true;
 901         server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
 902         cifs_dbg(FYI, "signing algorithm %d chosen\n",
 903                      server->signing_algorithm);
 904 }
 905
 906
 907 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 908                                      struct TCP_Server_Info *server,
 909                                      unsigned int len_of_smb)
 910 {
 911         struct smb2_neg_context *pctx;
 912         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 913         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 914         unsigned int len_of_ctxts, i;
 915         int rc = 0;
 916
 917         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 918         if (len_of_smb <= offset) {
 919                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 920                 return -EINVAL;
 921         }
 922
 923         len_of_ctxts = len_of_smb - offset;
 924
 925         for (i = 0; i < ctxt_cnt; i++) {
 926                 int clen;
 927                 /* check that offset is not beyond end of SMB */
 928                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 929                         break;
 930
 931                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 932                 clen = sizeof(struct smb2_neg_context)
 933                         + le16_to_cpu(pctx->DataLength);
 934                 /*
 935                  * 2.2.4 SMB2 NEGOTIATE Response
 936                  * Subsequent negotiate contexts MUST appear at the first 8-byte
 937                  * aligned offset following the previous negotiate context.
 938                  */
 939                 if (i + 1 != ctxt_cnt)
 940                         clen = ALIGN(clen, 8);
 941                 if (clen > len_of_ctxts)
 942                         break;
 943
 944                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 945                         decode_preauth_context(
 946                                 (struct smb2_preauth_neg_context *)pctx);
 947                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 948                         rc = decode_encrypt_ctx(server,
 949                                 (struct smb2_encryption_neg_context *)pctx);
 950                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 951                         decode_compress_ctx(server,
 952                                 (struct smb2_compression_capabilities_context *)pctx);
 953                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 954                         server->posix_ext_supported = true;
 955                 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
 956                         decode_signing_ctx(server,
 957                                 (struct smb2_signing_capabilities *)pctx);
 958                 else
 959                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 960                                 le16_to_cpu(pctx->ContextType));
 961                 if (rc)
 962                         break;
 963
 964                 offset += clen;
 965                 len_of_ctxts -= clen;
 966         }
 967         return rc;
 968 }
 969
 970 static struct create_posix *
 971 create_posix_buf(umode_t mode)
 972 {
 973         struct create_posix *buf;
 974
 975         buf = kzalloc(sizeof(struct create_posix),
 976                         GFP_KERNEL);
 977         if (!buf)
 978                 return NULL;
 979
 980         buf->ccontext.DataOffset =
 981                 cpu_to_le16(offsetof(struct create_posix, Mode));
 982         buf->ccontext.DataLength = cpu_to_le32(4);
 983         buf->ccontext.NameOffset =
 984                 cpu_to_le16(offsetof(struct create_posix, Name));
 985         buf->ccontext.NameLength = cpu_to_le16(16);
 986
 987         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 988         buf->Name[0] = 0x93;
 989         buf->Name[1] = 0xAD;
 990         buf->Name[2] = 0x25;
 991         buf->Name[3] = 0x50;
 992         buf->Name[4] = 0x9C;
 993         buf->Name[5] = 0xB4;
 994         buf->Name[6] = 0x11;
 995         buf->Name[7] = 0xE7;
 996         buf->Name[8] = 0xB4;
 997         buf->Name[9] = 0x23;
 998         buf->Name[10] = 0x83;
 999         buf->Name[11] = 0xDE;
1000         buf->Name[12] = 0x96;
1001         buf->Name[13] = 0x8B;
1002         buf->Name[14] = 0xCD;
1003         buf->Name[15] = 0x7C;
1004         buf->Mode = cpu_to_le32(mode);
1005         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
1006         return buf;
1007 }
1008
1009 static int
1010 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
1011 {
1012         unsigned int num = *num_iovec;
1013
1014         iov[num].iov_base = create_posix_buf(mode);
1015         if (mode == ACL_NO_MODE)
1016                 cifs_dbg(FYI, "%s: no mode\n", __func__);
1017         if (iov[num].iov_base == NULL)
1018                 return -ENOMEM;
1019         iov[num].iov_len = sizeof(struct create_posix);
1020         *num_iovec = num + 1;
1021         return 0;
1022 }
1023
1024
1025 /*
1026  *
1027  *      SMB2 Worker functions follow:
1028  *
1029  *      The general structure of the worker functions is:
1030  *      1) Call smb2_init (assembles SMB2 header)
1031  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
1032  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
1033  *      4) Decode SMB2 command specific fields in the fixed length area
1034  *      5) Decode variable length data area (if any for this SMB2 command type)
1035  *      6) Call free smb buffer
1036  *      7) return
1037  *
1038  */
1039
1040 int
1041 SMB2_negotiate(const unsigned int xid,
1042                struct cifs_ses *ses,
1043                struct TCP_Server_Info *server)
1044 {
1045         struct smb_rqst rqst;
1046         struct smb2_negotiate_req *req;
1047         struct smb2_negotiate_rsp *rsp;
1048         struct kvec iov[1];
1049         struct kvec rsp_iov;
1050         int rc;
1051         int resp_buftype;
1052         int blob_offset, blob_length;
1053         char *security_blob;
1054         int flags = CIFS_NEG_OP;
1055         unsigned int total_len;
1056
1057         cifs_dbg(FYI, "Negotiate protocol\n");
1058
1059         if (!server) {
1060                 WARN(1, "%s: server is NULL!\n", __func__);
1061                 return -EIO;
1062         }
1063
1064         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
1065                                  (void **) &req, &total_len);
1066         if (rc)
1067                 return rc;
1068
1069         req->hdr.SessionId = 0;
1070
1071         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1072         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1073
1074         if (strcmp(server->vals->version_string,
1075                    SMB3ANY_VERSION_STRING) == 0) {
1076                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1077                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1078                 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1079                 req->DialectCount = cpu_to_le16(3);
1080                 total_len += 6;
1081         } else if (strcmp(server->vals->version_string,
1082                    SMBDEFAULT_VERSION_STRING) == 0) {
1083                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1084                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1085                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1086                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1087                 req->DialectCount = cpu_to_le16(4);
1088                 total_len += 8;
1089         } else {
1090                 /* otherwise send specific dialect */
1091                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
1092                 req->DialectCount = cpu_to_le16(1);
1093                 total_len += 2;
1094         }
1095
1096         /* only one of SMB2 signing flags may be set in SMB2 request */
1097         if (ses->sign)
1098                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1099         else if (global_secflags & CIFSSEC_MAY_SIGN)
1100                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1101         else
1102                 req->SecurityMode = 0;
1103
1104         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
1105         if (ses->chan_max > 1)
1106                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1107
1108         /* ClientGUID must be zero for SMB2.02 dialect */
1109         if (server->vals->protocol_id == SMB20_PROT_ID)
1110                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
1111         else {
1112                 memcpy(req->ClientGUID, server->client_guid,
1113                         SMB2_CLIENT_GUID_SIZE);
1114                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
1115                     (strcmp(server->vals->version_string,
1116                      SMB3ANY_VERSION_STRING) == 0) ||
1117                     (strcmp(server->vals->version_string,
1118                      SMBDEFAULT_VERSION_STRING) == 0))
1119                         assemble_neg_contexts(req, server, &total_len);
1120         }
1121         iov[0].iov_base = (char *)req;
1122         iov[0].iov_len = total_len;
1123
1124         memset(&rqst, 0, sizeof(struct smb_rqst));
1125         rqst.rq_iov = iov;
1126         rqst.rq_nvec = 1;
1127
1128         rc = cifs_send_recv(xid, ses, server,
1129                             &rqst, &resp_buftype, flags, &rsp_iov);
1130         cifs_small_buf_release(req);
1131         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
1132         /*
1133          * No tcon so can't do
1134          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1135          */
1136         if (rc == -EOPNOTSUPP) {
1137                 cifs_server_dbg(VFS, "Dialect not supported by server. Consider  specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n");
1138                 goto neg_exit;
1139         } else if (rc != 0)
1140                 goto neg_exit;
1141
1142         rc = -EIO;
1143         if (strcmp(server->vals->version_string,
1144                    SMB3ANY_VERSION_STRING) == 0) {
1145                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1146                         cifs_server_dbg(VFS,
1147                                 "SMB2 dialect returned but not requested\n");
1148                         goto neg_exit;
1149                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1150                         cifs_server_dbg(VFS,
1151                                 "SMB2.1 dialect returned but not requested\n");
1152                         goto neg_exit;
1153                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1154                         /* ops set to 3.0 by default for default so update */
1155                         server->ops = &smb311_operations;
1156                         server->vals = &smb311_values;
1157                 }
1158         } else if (strcmp(server->vals->version_string,
1159                    SMBDEFAULT_VERSION_STRING) == 0) {
1160                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1161                         cifs_server_dbg(VFS,
1162                                 "SMB2 dialect returned but not requested\n");
1163                         goto neg_exit;
1164                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1165                         /* ops set to 3.0 by default for default so update */
1166                         server->ops = &smb21_operations;
1167                         server->vals = &smb21_values;
1168                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1169                         server->ops = &smb311_operations;
1170                         server->vals = &smb311_values;
1171                 }
1172         } else if (le16_to_cpu(rsp->DialectRevision) !=
1173                                 server->vals->protocol_id) {
1174                 /* if requested single dialect ensure returned dialect matched */
1175                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
1176                                 le16_to_cpu(rsp->DialectRevision));
1177                 goto neg_exit;
1178         }
1179
1180         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1181
1182         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
1183                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1184         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
1185                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1186         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
1187                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1188         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
1189                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1190         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
1191                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1192         else {
1193                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1194                                 le16_to_cpu(rsp->DialectRevision));
1195                 goto neg_exit;
1196         }
1197
1198         rc = 0;
1199         server->dialect = le16_to_cpu(rsp->DialectRevision);
1200
1201         /*
1202          * Keep a copy of the hash after negprot. This hash will be
1203          * the starting hash value for all sessions made from this
1204          * server.
1205          */
1206         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1207                SMB2_PREAUTH_HASH_SIZE);
1208
1209         /* SMB2 only has an extended negflavor */
1210         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1211         /* set it to the maximum buffer size value we can send with 1 credit */
1212         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1213                                SMB2_MAX_BUFFER_SIZE);
1214         server->max_read = le32_to_cpu(rsp->MaxReadSize);
1215         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1216         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1217         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1218                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1219                                 server->sec_mode);
1220         server->capabilities = le32_to_cpu(rsp->Capabilities);
1221         /* Internal types */
1222         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1223
1224         /*
1225          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1226          * Set the cipher type manually.
1227          */
1228         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1229                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1230
1231         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1232                                                (struct smb2_hdr *)rsp);
1233         /*
1234          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1235          * for us will be
1236          *      ses->sectype = RawNTLMSSP;
1237          * but for time being this is our only auth choice so doesn't matter.
1238          * We just found a server which sets blob length to zero expecting raw.
1239          */
1240         if (blob_length == 0) {
1241                 cifs_dbg(FYI, "missing security blob on negprot\n");
1242                 server->sec_ntlmssp = true;
1243         }
1244
1245         rc = cifs_enable_signing(server, ses->sign);
1246         if (rc)
1247                 goto neg_exit;
1248         if (blob_length) {
1249                 rc = decode_negTokenInit(security_blob, blob_length, server);
1250                 if (rc == 1)
1251                         rc = 0;
1252                 else if (rc == 0)
1253                         rc = -EIO;
1254         }
1255
1256         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1257                 if (rsp->NegotiateContextCount)
1258                         rc = smb311_decode_neg_context(rsp, server,
1259                                                        rsp_iov.iov_len);
1260                 else
1261                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1262         }
1263 neg_exit:
1264         free_rsp_buf(resp_buftype, rsp);
1265         return rc;
1266 }
1267
1268 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1269 {
1270         int rc;
1271         struct validate_negotiate_info_req *pneg_inbuf;
1272         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1273         u32 rsplen;
1274         u32 inbuflen; /* max of 4 dialects */
1275         struct TCP_Server_Info *server = tcon->ses->server;
1276
1277         cifs_dbg(FYI, "validate negotiate\n");
1278
1279         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1280         if (server->dialect == SMB311_PROT_ID)
1281                 return 0;
1282
1283         /*
1284          * validation ioctl must be signed, so no point sending this if we
1285          * can not sign it (ie are not known user).  Even if signing is not
1286          * required (enabled but not negotiated), in those cases we selectively
1287          * sign just this, the first and only signed request on a connection.
1288          * Having validation of negotiate info  helps reduce attack vectors.
1289          */
1290         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1291                 return 0; /* validation requires signing */
1292
1293         if (tcon->ses->user_name == NULL) {
1294                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1295                 return 0; /* validation requires signing */
1296         }
1297
1298         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1299                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1300
1301         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1302         if (!pneg_inbuf)
1303                 return -ENOMEM;
1304
1305         pneg_inbuf->Capabilities =
1306                         cpu_to_le32(server->vals->req_capabilities);
1307         if (tcon->ses->chan_max > 1)
1308                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1309
1310         memcpy(pneg_inbuf->Guid, server->client_guid,
1311                                         SMB2_CLIENT_GUID_SIZE);
1312
1313         if (tcon->ses->sign)
1314                 pneg_inbuf->SecurityMode =
1315                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1316         else if (global_secflags & CIFSSEC_MAY_SIGN)
1317                 pneg_inbuf->SecurityMode =
1318                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1319         else
1320                 pneg_inbuf->SecurityMode = 0;
1321
1322
1323         if (strcmp(server->vals->version_string,
1324                 SMB3ANY_VERSION_STRING) == 0) {
1325                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1326                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1327                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1328                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1329                 /* SMB 2.1 not included so subtract one dialect from len */
1330                 inbuflen = sizeof(*pneg_inbuf) -
1331                                 (sizeof(pneg_inbuf->Dialects[0]));
1332         } else if (strcmp(server->vals->version_string,
1333                 SMBDEFAULT_VERSION_STRING) == 0) {
1334                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1335                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1336                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1337                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1338                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1339                 /* structure is big enough for 4 dialects */
1340                 inbuflen = sizeof(*pneg_inbuf);
1341         } else {
1342                 /* otherwise specific dialect was requested */
1343                 pneg_inbuf->Dialects[0] =
1344                         cpu_to_le16(server->vals->protocol_id);
1345                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1346                 /* structure is big enough for 4 dialects, sending only 1 */
1347                 inbuflen = sizeof(*pneg_inbuf) -
1348                                 sizeof(pneg_inbuf->Dialects[0]) * 3;
1349         }
1350
1351         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1352                 FSCTL_VALIDATE_NEGOTIATE_INFO,
1353                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1354                 (char **)&pneg_rsp, &rsplen);
1355         if (rc == -EOPNOTSUPP) {
1356                 /*
1357                  * Old Windows versions or Netapp SMB server can return
1358                  * not supported error. Client should accept it.
1359                  */
1360                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1361                 rc = 0;
1362                 goto out_free_inbuf;
1363         } else if (rc != 0) {
1364                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1365                               rc);
1366                 rc = -EIO;
1367                 goto out_free_inbuf;
1368         }
1369
1370         rc = -EIO;
1371         if (rsplen != sizeof(*pneg_rsp)) {
1372                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1373                               rsplen);
1374
1375                 /* relax check since Mac returns max bufsize allowed on ioctl */
1376                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1377                         goto out_free_rsp;
1378         }
1379
1380         /* check validate negotiate info response matches what we got earlier */
1381         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1382                 goto vneg_out;
1383
1384         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1385                 goto vneg_out;
1386
1387         /* do not validate server guid because not saved at negprot time yet */
1388
1389         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1390               SMB2_LARGE_FILES) != server->capabilities)
1391                 goto vneg_out;
1392
1393         /* validate negotiate successful */
1394         rc = 0;
1395         cifs_dbg(FYI, "validate negotiate info successful\n");
1396         goto out_free_rsp;
1397
1398 vneg_out:
1399         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1400 out_free_rsp:
1401         kfree(pneg_rsp);
1402 out_free_inbuf:
1403         kfree(pneg_inbuf);
1404         return rc;
1405 }
1406
1407 enum securityEnum
1408 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1409 {
1410         switch (requested) {
1411         case Kerberos:
1412         case RawNTLMSSP:
1413                 return requested;
1414         case NTLMv2:
1415                 return RawNTLMSSP;
1416         case Unspecified:
1417                 if (server->sec_ntlmssp &&
1418                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1419                         return RawNTLMSSP;
1420                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1421                         (global_secflags & CIFSSEC_MAY_KRB5))
1422                         return Kerberos;
1423                 fallthrough;
1424         default:
1425                 return Unspecified;
1426         }
1427 }
1428
1429 struct SMB2_sess_data {
1430         unsigned int xid;
1431         struct cifs_ses *ses;
1432         struct TCP_Server_Info *server;
1433         struct nls_table *nls_cp;
1434         void (*func)(struct SMB2_sess_data *);
1435         int result;
1436         u64 previous_session;
1437
1438         /* we will send the SMB in three pieces:
1439          * a fixed length beginning part, an optional
1440          * SPNEGO blob (which can be zero length), and a
1441          * last part which will include the strings
1442          * and rest of bcc area. This allows us to avoid
1443          * a large buffer 17K allocation
1444          */
1445         int buf0_type;
1446         struct kvec iov[2];
1447 };
1448
1449 static int
1450 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1451 {
1452         int rc;
1453         struct cifs_ses *ses = sess_data->ses;
1454         struct TCP_Server_Info *server = sess_data->server;
1455         struct smb2_sess_setup_req *req;
1456         unsigned int total_len;
1457         bool is_binding = false;
1458
1459         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1460                                  (void **) &req,
1461                                  &total_len);
1462         if (rc)
1463                 return rc;
1464
1465         spin_lock(&ses->ses_lock);
1466         is_binding = (ses->ses_status == SES_GOOD);
1467         spin_unlock(&ses->ses_lock);
1468
1469         if (is_binding) {
1470                 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1471                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1472                 req->PreviousSessionId = 0;
1473                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1474                 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1475         } else {
1476                 /* First session, not a reauthenticate */
1477                 req->hdr.SessionId = 0;
1478                 /*
1479                  * if reconnect, we need to send previous sess id
1480                  * otherwise it is 0
1481                  */
1482                 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1483                 req->Flags = 0; /* MBZ */
1484                 cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1485                          sess_data->previous_session);
1486         }
1487
1488         /* enough to enable echos and oplocks and one max size write */
1489         if (server->credits >= server->max_credits)
1490                 req->hdr.CreditRequest = cpu_to_le16(0);
1491         else
1492                 req->hdr.CreditRequest = cpu_to_le16(
1493                         min_t(int, server->max_credits -
1494                               server->credits, 130));
1495
1496         /* only one of SMB2 signing flags may be set in SMB2 request */
1497         if (server->sign)
1498                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1499         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1500                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1501         else
1502                 req->SecurityMode = 0;
1503
1504 #ifdef CONFIG_CIFS_DFS_UPCALL
1505         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1506 #else
1507         req->Capabilities = 0;
1508 #endif /* DFS_UPCALL */
1509
1510         req->Channel = 0; /* MBZ */
1511
1512         sess_data->iov[0].iov_base = (char *)req;
1513         /* 1 for pad */
1514         sess_data->iov[0].iov_len = total_len - 1;
1515         /*
1516          * This variable will be used to clear the buffer
1517          * allocated above in case of any error in the calling function.
1518          */
1519         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1520
1521         return 0;
1522 }
1523
1524 static void
1525 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1526 {
1527         struct kvec *iov = sess_data->iov;
1528
1529         /* iov[1] is already freed by caller */
1530         if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1531                 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1532
1533         free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1534         sess_data->buf0_type = CIFS_NO_BUFFER;
1535 }
1536
1537 static int
1538 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1539 {
1540         int rc;
1541         struct smb_rqst rqst;
1542         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1543         struct kvec rsp_iov = { NULL, 0 };
1544
1545         /* Testing shows that buffer offset must be at location of Buffer[0] */
1546         req->SecurityBufferOffset =
1547                 cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1548         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1549
1550         memset(&rqst, 0, sizeof(struct smb_rqst));
1551         rqst.rq_iov = sess_data->iov;
1552         rqst.rq_nvec = 2;
1553
1554         /* BB add code to build os and lm fields */
1555         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1556                             sess_data->server,
1557                             &rqst,
1558                             &sess_data->buf0_type,
1559                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1560         cifs_small_buf_release(sess_data->iov[0].iov_base);
1561         if (rc == 0)
1562                 sess_data->ses->expired_pwd = false;
1563         else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED))
1564                 sess_data->ses->expired_pwd = true;
1565
1566         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1567
1568         return rc;
1569 }
1570
1571 static int
1572 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1573 {
1574         int rc = 0;
1575         struct cifs_ses *ses = sess_data->ses;
1576         struct TCP_Server_Info *server = sess_data->server;
1577
1578         cifs_server_lock(server);
1579         if (server->ops->generate_signingkey) {
1580                 rc = server->ops->generate_signingkey(ses, server);
1581                 if (rc) {
1582                         cifs_dbg(FYI,
1583                                 "SMB3 session key generation failed\n");
1584                         cifs_server_unlock(server);
1585                         return rc;
1586                 }
1587         }
1588         if (!server->session_estab) {
1589                 server->sequence_number = 0x2;
1590                 server->session_estab = true;
1591         }
1592         cifs_server_unlock(server);
1593
1594         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1595         return rc;
1596 }
1597
1598 #ifdef CONFIG_CIFS_UPCALL
1599 static void
1600 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1601 {
1602         int rc;
1603         struct cifs_ses *ses = sess_data->ses;
1604         struct TCP_Server_Info *server = sess_data->server;
1605         struct cifs_spnego_msg *msg;
1606         struct key *spnego_key = NULL;
1607         struct smb2_sess_setup_rsp *rsp = NULL;
1608         bool is_binding = false;
1609
1610         rc = SMB2_sess_alloc_buffer(sess_data);
1611         if (rc)
1612                 goto out;
1613
1614         spnego_key = cifs_get_spnego_key(ses, server);
1615         if (IS_ERR(spnego_key)) {
1616                 rc = PTR_ERR(spnego_key);
1617                 if (rc == -ENOKEY)
1618                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1619                 spnego_key = NULL;
1620                 goto out;
1621         }
1622
1623         msg = spnego_key->payload.data[0];
1624         /*
1625          * check version field to make sure that cifs.upcall is
1626          * sending us a response in an expected form
1627          */
1628         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1629                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1630                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1631                 rc = -EKEYREJECTED;
1632                 goto out_put_spnego_key;
1633         }
1634
1635         spin_lock(&ses->ses_lock);
1636         is_binding = (ses->ses_status == SES_GOOD);
1637         spin_unlock(&ses->ses_lock);
1638
1639         /* keep session key if binding */
1640         if (!is_binding) {
1641                 kfree_sensitive(ses->auth_key.response);
1642                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1643                                                  GFP_KERNEL);
1644                 if (!ses->auth_key.response) {
1645                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1646                                  msg->sesskey_len);
1647                         rc = -ENOMEM;
1648                         goto out_put_spnego_key;
1649                 }
1650                 ses->auth_key.len = msg->sesskey_len;
1651         }
1652
1653         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1654         sess_data->iov[1].iov_len = msg->secblob_len;
1655
1656         rc = SMB2_sess_sendreceive(sess_data);
1657         if (rc)
1658                 goto out_put_spnego_key;
1659
1660         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1661         /* keep session id and flags if binding */
1662         if (!is_binding) {
1663                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1664                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1665         }
1666
1667         rc = SMB2_sess_establish_session(sess_data);
1668 out_put_spnego_key:
1669         key_invalidate(spnego_key);
1670         key_put(spnego_key);
1671         if (rc) {
1672                 kfree_sensitive(ses->auth_key.response);
1673                 ses->auth_key.response = NULL;
1674                 ses->auth_key.len = 0;
1675         }
1676 out:
1677         sess_data->result = rc;
1678         sess_data->func = NULL;
1679         SMB2_sess_free_buffer(sess_data);
1680 }
1681 #else
1682 static void
1683 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1684 {
1685         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1686         sess_data->result = -EOPNOTSUPP;
1687         sess_data->func = NULL;
1688 }
1689 #endif
1690
1691 static void
1692 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1693
1694 static void
1695 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1696 {
1697         int rc;
1698         struct cifs_ses *ses = sess_data->ses;
1699         struct TCP_Server_Info *server = sess_data->server;
1700         struct smb2_sess_setup_rsp *rsp = NULL;
1701         unsigned char *ntlmssp_blob = NULL;
1702         bool use_spnego = false; /* else use raw ntlmssp */
1703         u16 blob_length = 0;
1704         bool is_binding = false;
1705
1706         /*
1707          * If memory allocation is successful, caller of this function
1708          * frees it.
1709          */
1710         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1711         if (!ses->ntlmssp) {
1712                 rc = -ENOMEM;
1713                 goto out_err;
1714         }
1715         ses->ntlmssp->sesskey_per_smbsess = true;
1716
1717         rc = SMB2_sess_alloc_buffer(sess_data);
1718         if (rc)
1719                 goto out_err;
1720
1721         rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1722                                           &blob_length, ses, server,
1723                                           sess_data->nls_cp);
1724         if (rc)
1725                 goto out;
1726
1727         if (use_spnego) {
1728                 /* BB eventually need to add this */
1729                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1730                 rc = -EOPNOTSUPP;
1731                 goto out;
1732         }
1733         sess_data->iov[1].iov_base = ntlmssp_blob;
1734         sess_data->iov[1].iov_len = blob_length;
1735
1736         rc = SMB2_sess_sendreceive(sess_data);
1737         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1738
1739         /* If true, rc here is expected and not an error */
1740         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1741                 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1742                 rc = 0;
1743
1744         if (rc)
1745                 goto out;
1746
1747         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1748                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1749                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1750                         le16_to_cpu(rsp->SecurityBufferOffset));
1751                 rc = -EIO;
1752                 goto out;
1753         }
1754         rc = decode_ntlmssp_challenge(rsp->Buffer,
1755                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1756         if (rc)
1757                 goto out;
1758
1759         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1760
1761         spin_lock(&ses->ses_lock);
1762         is_binding = (ses->ses_status == SES_GOOD);
1763         spin_unlock(&ses->ses_lock);
1764
1765         /* keep existing ses id and flags if binding */
1766         if (!is_binding) {
1767                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1768                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1769         }
1770
1771 out:
1772         kfree_sensitive(ntlmssp_blob);
1773         SMB2_sess_free_buffer(sess_data);
1774         if (!rc) {
1775                 sess_data->result = 0;
1776                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1777                 return;
1778         }
1779 out_err:
1780         kfree_sensitive(ses->ntlmssp);
1781         ses->ntlmssp = NULL;
1782         sess_data->result = rc;
1783         sess_data->func = NULL;
1784 }
1785
1786 static void
1787 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1788 {
1789         int rc;
1790         struct cifs_ses *ses = sess_data->ses;
1791         struct TCP_Server_Info *server = sess_data->server;
1792         struct smb2_sess_setup_req *req;
1793         struct smb2_sess_setup_rsp *rsp = NULL;
1794         unsigned char *ntlmssp_blob = NULL;
1795         bool use_spnego = false; /* else use raw ntlmssp */
1796         u16 blob_length = 0;
1797         bool is_binding = false;
1798
1799         rc = SMB2_sess_alloc_buffer(sess_data);
1800         if (rc)
1801                 goto out;
1802
1803         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1804         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1805
1806         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1807                                      ses, server,
1808                                      sess_data->nls_cp);
1809         if (rc) {
1810                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1811                 goto out;
1812         }
1813
1814         if (use_spnego) {
1815                 /* BB eventually need to add this */
1816                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1817                 rc = -EOPNOTSUPP;
1818                 goto out;
1819         }
1820         sess_data->iov[1].iov_base = ntlmssp_blob;
1821         sess_data->iov[1].iov_len = blob_length;
1822
1823         rc = SMB2_sess_sendreceive(sess_data);
1824         if (rc)
1825                 goto out;
1826
1827         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1828
1829         spin_lock(&ses->ses_lock);
1830         is_binding = (ses->ses_status == SES_GOOD);
1831         spin_unlock(&ses->ses_lock);
1832
1833         /* keep existing ses id and flags if binding */
1834         if (!is_binding) {
1835                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1836                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1837         }
1838
1839         rc = SMB2_sess_establish_session(sess_data);
1840 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1841         if (ses->server->dialect < SMB30_PROT_ID) {
1842                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1843                 /*
1844                  * The session id is opaque in terms of endianness, so we can't
1845                  * print it as a long long. we dump it as we got it on the wire
1846                  */
1847                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1848                          &ses->Suid);
1849                 cifs_dbg(VFS, "Session Key   %*ph\n",
1850                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1851                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1852                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1853         }
1854 #endif
1855 out:
1856         kfree_sensitive(ntlmssp_blob);
1857         SMB2_sess_free_buffer(sess_data);
1858         kfree_sensitive(ses->ntlmssp);
1859         ses->ntlmssp = NULL;
1860         sess_data->result = rc;
1861         sess_data->func = NULL;
1862 }
1863
1864 static int
1865 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1866 {
1867         int type;
1868         struct cifs_ses *ses = sess_data->ses;
1869         struct TCP_Server_Info *server = sess_data->server;
1870
1871         type = smb2_select_sectype(server, ses->sectype);
1872         cifs_dbg(FYI, "sess setup type %d\n", type);
1873         if (type == Unspecified) {
1874                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1875                 return -EINVAL;
1876         }
1877
1878         switch (type) {
1879         case Kerberos:
1880                 sess_data->func = SMB2_auth_kerberos;
1881                 break;
1882         case RawNTLMSSP:
1883                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1884                 break;
1885         default:
1886                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1887                 return -EOPNOTSUPP;
1888         }
1889
1890         return 0;
1891 }
1892
1893 int
1894 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1895                 struct TCP_Server_Info *server,
1896                 const struct nls_table *nls_cp)
1897 {
1898         int rc = 0;
1899         struct SMB2_sess_data *sess_data;
1900
1901         cifs_dbg(FYI, "Session Setup\n");
1902
1903         if (!server) {
1904                 WARN(1, "%s: server is NULL!\n", __func__);
1905                 return -EIO;
1906         }
1907
1908         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1909         if (!sess_data)
1910                 return -ENOMEM;
1911
1912         sess_data->xid = xid;
1913         sess_data->ses = ses;
1914         sess_data->server = server;
1915         sess_data->buf0_type = CIFS_NO_BUFFER;
1916         sess_data->nls_cp = (struct nls_table *) nls_cp;
1917         sess_data->previous_session = ses->Suid;
1918
1919         rc = SMB2_select_sec(sess_data);
1920         if (rc)
1921                 goto out;
1922
1923         /*
1924          * Initialize the session hash with the server one.
1925          */
1926         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1927                SMB2_PREAUTH_HASH_SIZE);
1928
1929         while (sess_data->func)
1930                 sess_data->func(sess_data);
1931
1932         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1933                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1934         rc = sess_data->result;
1935 out:
1936         kfree_sensitive(sess_data);
1937         return rc;
1938 }
1939
1940 int
1941 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1942 {
1943         struct smb_rqst rqst;
1944         struct smb2_logoff_req *req; /* response is also trivial struct */
1945         int rc = 0;
1946         struct TCP_Server_Info *server;
1947         int flags = 0;
1948         unsigned int total_len;
1949         struct kvec iov[1];
1950         struct kvec rsp_iov;
1951         int resp_buf_type;
1952
1953         cifs_dbg(FYI, "disconnect session %p\n", ses);
1954
1955         if (ses && (ses->server))
1956                 server = ses->server;
1957         else
1958                 return -EIO;
1959
1960         /* no need to send SMB logoff if uid already closed due to reconnect */
1961         spin_lock(&ses->chan_lock);
1962         if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1963                 spin_unlock(&ses->chan_lock);
1964                 goto smb2_session_already_dead;
1965         }
1966         spin_unlock(&ses->chan_lock);
1967
1968         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1969                                  (void **) &req, &total_len);
1970         if (rc)
1971                 return rc;
1972
1973          /* since no tcon, smb2_init can not do this, so do here */
1974         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1975
1976         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1977                 flags |= CIFS_TRANSFORM_REQ;
1978         else if (server->sign)
1979                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1980
1981         flags |= CIFS_NO_RSP_BUF;
1982
1983         iov[0].iov_base = (char *)req;
1984         iov[0].iov_len = total_len;
1985
1986         memset(&rqst, 0, sizeof(struct smb_rqst));
1987         rqst.rq_iov = iov;
1988         rqst.rq_nvec = 1;
1989
1990         rc = cifs_send_recv(xid, ses, ses->server,
1991                             &rqst, &resp_buf_type, flags, &rsp_iov);
1992         cifs_small_buf_release(req);
1993         /*
1994          * No tcon so can't do
1995          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1996          */
1997
1998 smb2_session_already_dead:
1999         return rc;
2000 }
2001
2002 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
2003 {
2004         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
2005 }
2006
2007 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
2008
2009 /* These are similar values to what Windows uses */
2010 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
2011 {
2012         tcon->max_chunks = 256;
2013         tcon->max_bytes_chunk = 1048576;
2014         tcon->max_bytes_copy = 16777216;
2015 }
2016
2017 int
2018 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
2019           struct cifs_tcon *tcon, const struct nls_table *cp)
2020 {
2021         struct smb_rqst rqst;
2022         struct smb2_tree_connect_req *req;
2023         struct smb2_tree_connect_rsp *rsp = NULL;
2024         struct kvec iov[2];
2025         struct kvec rsp_iov = { NULL, 0 };
2026         int rc = 0;
2027         int resp_buftype;
2028         int unc_path_len;
2029         __le16 *unc_path = NULL;
2030         int flags = 0;
2031         unsigned int total_len;
2032         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2033
2034         cifs_dbg(FYI, "TCON\n");
2035
2036         if (!server || !tree)
2037                 return -EIO;
2038
2039         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
2040         if (unc_path == NULL)
2041                 return -ENOMEM;
2042
2043         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
2044         if (unc_path_len <= 0) {
2045                 kfree(unc_path);
2046                 return -EINVAL;
2047         }
2048         unc_path_len *= 2;
2049
2050         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
2051         tcon->tid = 0;
2052         atomic_set(&tcon->num_remote_opens, 0);
2053         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
2054                                  (void **) &req, &total_len);
2055         if (rc) {
2056                 kfree(unc_path);
2057                 return rc;
2058         }
2059
2060         if (smb3_encryption_required(tcon))
2061                 flags |= CIFS_TRANSFORM_REQ;
2062
2063         iov[0].iov_base = (char *)req;
2064         /* 1 for pad */
2065         iov[0].iov_len = total_len - 1;
2066
2067         /* Testing shows that buffer offset must be at location of Buffer[0] */
2068         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
2069         req->PathLength = cpu_to_le16(unc_path_len);
2070         iov[1].iov_base = unc_path;
2071         iov[1].iov_len = unc_path_len;
2072
2073         /*
2074          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
2075          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
2076          * (Samba servers don't always set the flag so also check if null user)
2077          */
2078         if ((server->dialect == SMB311_PROT_ID) &&
2079             !smb3_encryption_required(tcon) &&
2080             !(ses->session_flags &
2081                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
2082             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
2083                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
2084
2085         memset(&rqst, 0, sizeof(struct smb_rqst));
2086         rqst.rq_iov = iov;
2087         rqst.rq_nvec = 2;
2088
2089         /* Need 64 for max size write so ask for more in case not there yet */
2090         if (server->credits >= server->max_credits)
2091                 req->hdr.CreditRequest = cpu_to_le16(0);
2092         else
2093                 req->hdr.CreditRequest = cpu_to_le16(
2094                         min_t(int, server->max_credits -
2095                               server->credits, 64));
2096
2097         rc = cifs_send_recv(xid, ses, server,
2098                             &rqst, &resp_buftype, flags, &rsp_iov);
2099         cifs_small_buf_release(req);
2100         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
2101         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
2102         if ((rc != 0) || (rsp == NULL)) {
2103                 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
2104                 tcon->need_reconnect = true;
2105                 goto tcon_error_exit;
2106         }
2107
2108         switch (rsp->ShareType) {
2109         case SMB2_SHARE_TYPE_DISK:
2110                 cifs_dbg(FYI, "connection to disk share\n");
2111                 break;
2112         case SMB2_SHARE_TYPE_PIPE:
2113                 tcon->pipe = true;
2114                 cifs_dbg(FYI, "connection to pipe share\n");
2115                 break;
2116         case SMB2_SHARE_TYPE_PRINT:
2117                 tcon->print = true;
2118                 cifs_dbg(FYI, "connection to printer\n");
2119                 break;
2120         default:
2121                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
2122                 rc = -EOPNOTSUPP;
2123                 goto tcon_error_exit;
2124         }
2125
2126         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
2127         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
2128         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
2129         tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
2130         strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
2131
2132         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
2133             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
2134                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
2135
2136         if (tcon->seal &&
2137             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
2138                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
2139
2140         init_copy_chunk_defaults(tcon);
2141         if (server->ops->validate_negotiate)
2142                 rc = server->ops->validate_negotiate(xid, tcon);
2143         if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
2144                 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
2145                         server->nosharesock = true;
2146 tcon_exit:
2147
2148         free_rsp_buf(resp_buftype, rsp);
2149         kfree(unc_path);
2150         return rc;
2151
2152 tcon_error_exit:
2153         if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
2154                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
2155         goto tcon_exit;
2156 }
2157
2158 int
2159 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
2160 {
2161         struct smb_rqst rqst;
2162         struct smb2_tree_disconnect_req *req; /* response is trivial */
2163         int rc = 0;
2164         struct cifs_ses *ses = tcon->ses;
2165         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2166         int flags = 0;
2167         unsigned int total_len;
2168         struct kvec iov[1];
2169         struct kvec rsp_iov;
2170         int resp_buf_type;
2171
2172         cifs_dbg(FYI, "Tree Disconnect\n");
2173
2174         if (!ses || !(ses->server))
2175                 return -EIO;
2176
2177         trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
2178         spin_lock(&ses->chan_lock);
2179         if ((tcon->need_reconnect) ||
2180             (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
2181                 spin_unlock(&ses->chan_lock);
2182                 return 0;
2183         }
2184         spin_unlock(&ses->chan_lock);
2185
2186         invalidate_all_cached_dirs(tcon);
2187
2188         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server,
2189                                  (void **) &req,
2190                                  &total_len);
2191         if (rc)
2192                 return rc;
2193
2194         if (smb3_encryption_required(tcon))
2195                 flags |= CIFS_TRANSFORM_REQ;
2196
2197         flags |= CIFS_NO_RSP_BUF;
2198
2199         iov[0].iov_base = (char *)req;
2200         iov[0].iov_len = total_len;
2201
2202         memset(&rqst, 0, sizeof(struct smb_rqst));
2203         rqst.rq_iov = iov;
2204         rqst.rq_nvec = 1;
2205
2206         rc = cifs_send_recv(xid, ses, server,
2207                             &rqst, &resp_buf_type, flags, &rsp_iov);
2208         cifs_small_buf_release(req);
2209         if (rc) {
2210                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2211                 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2212         }
2213         trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2214
2215         return rc;
2216 }
2217
2218
2219 static struct create_durable *
2220 create_durable_buf(void)
2221 {
2222         struct create_durable *buf;
2223
2224         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2225         if (!buf)
2226                 return NULL;
2227
2228         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2229                                         (struct create_durable, Data));
2230         buf->ccontext.DataLength = cpu_to_le32(16);
2231         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2232                                 (struct create_durable, Name));
2233         buf->ccontext.NameLength = cpu_to_le16(4);
2234         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2235         buf->Name[0] = 'D';
2236         buf->Name[1] = 'H';
2237         buf->Name[2] = 'n';
2238         buf->Name[3] = 'Q';
2239         return buf;
2240 }
2241
2242 static struct create_durable *
2243 create_reconnect_durable_buf(struct cifs_fid *fid)
2244 {
2245         struct create_durable *buf;
2246
2247         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2248         if (!buf)
2249                 return NULL;
2250
2251         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2252                                         (struct create_durable, Data));
2253         buf->ccontext.DataLength = cpu_to_le32(16);
2254         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2255                                 (struct create_durable, Name));
2256         buf->ccontext.NameLength = cpu_to_le16(4);
2257         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2258         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2259         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2260         buf->Name[0] = 'D';
2261         buf->Name[1] = 'H';
2262         buf->Name[2] = 'n';
2263         buf->Name[3] = 'C';
2264         return buf;
2265 }
2266
2267 static void
2268 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2269 {
2270         struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
2271
2272         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2273                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2274         buf->IndexNumber = pdisk_id->DiskFileId;
2275 }
2276
2277 static void
2278 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2279                  struct create_posix_rsp *posix)
2280 {
2281         int sid_len;
2282         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2283         u8 *end = beg + le32_to_cpu(cc->DataLength);
2284         u8 *sid;
2285
2286         memset(posix, 0, sizeof(*posix));
2287
2288         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2289         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2290         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2291
2292         sid = beg + 12;
2293         sid_len = posix_info_sid_size(sid, end);
2294         if (sid_len < 0) {
2295                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2296                 return;
2297         }
2298         memcpy(&posix->owner, sid, sid_len);
2299
2300         sid = sid + sid_len;
2301         sid_len = posix_info_sid_size(sid, end);
2302         if (sid_len < 0) {
2303                 cifs_dbg(VFS, "bad group sid in posix create response\n");
2304                 return;
2305         }
2306         memcpy(&posix->group, sid, sid_len);
2307
2308         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2309                  posix->nlink, posix->mode, posix->reparse_tag);
2310 }
2311
2312 int smb2_parse_contexts(struct TCP_Server_Info *server,
2313                         struct kvec *rsp_iov,
2314                         unsigned int *epoch,
2315                         char *lease_key, __u8 *oplock,
2316                         struct smb2_file_all_info *buf,
2317                         struct create_posix_rsp *posix)
2318 {
2319         struct smb2_create_rsp *rsp = rsp_iov->iov_base;
2320         struct create_context *cc;
2321         size_t rem, off, len;
2322         size_t doff, dlen;
2323         size_t noff, nlen;
2324         char *name;
2325         static const char smb3_create_tag_posix[] = {
2326                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2327                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2328                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2329         };
2330
2331         *oplock = 0;
2332
2333         off = le32_to_cpu(rsp->CreateContextsOffset);
2334         rem = le32_to_cpu(rsp->CreateContextsLength);
2335         if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)
2336                 return -EINVAL;
2337         cc = (struct create_context *)((u8 *)rsp + off);
2338
2339         /* Initialize inode number to 0 in case no valid data in qfid context */
2340         if (buf)
2341                 buf->IndexNumber = 0;
2342
2343         while (rem >= sizeof(*cc)) {
2344                 doff = le16_to_cpu(cc->DataOffset);
2345                 dlen = le32_to_cpu(cc->DataLength);
2346                 if (check_add_overflow(doff, dlen, &len) || len > rem)
2347                         return -EINVAL;
2348
2349                 noff = le16_to_cpu(cc->NameOffset);
2350                 nlen = le16_to_cpu(cc->NameLength);
2351                 if (noff + nlen > doff)
2352                         return -EINVAL;
2353
2354                 name = (char *)cc + noff;
2355                 switch (nlen) {
2356                 case 4:
2357                         if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
2358                                 *oplock = server->ops->parse_lease_buf(cc, epoch,
2359                                                                        lease_key);
2360                         } else if (buf &&
2361                                    !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {
2362                                 parse_query_id_ctxt(cc, buf);
2363                         }
2364                         break;
2365                 case 16:
2366                         if (posix && !memcmp(name, smb3_create_tag_posix, 16))
2367                                 parse_posix_ctxt(cc, buf, posix);
2368                         break;
2369                 default:
2370                         cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",
2371                                  __func__, nlen, dlen);
2372                         if (IS_ENABLED(CONFIG_CIFS_DEBUG2))
2373                                 cifs_dump_mem("context data: ", cc, dlen);
2374                         break;
2375                 }
2376
2377                 off = le32_to_cpu(cc->Next);
2378                 if (!off)
2379                         break;
2380                 if (check_sub_overflow(rem, off, &rem))
2381                         return -EINVAL;
2382                 cc = (struct create_context *)((u8 *)cc + off);
2383         }
2384
2385         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2386                 *oplock = rsp->OplockLevel;
2387
2388         return 0;
2389 }
2390
2391 static int
2392 add_lease_context(struct TCP_Server_Info *server,
2393                   struct smb2_create_req *req,
2394                   struct kvec *iov,
2395                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2396 {
2397         unsigned int num = *num_iovec;
2398
2399         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2400         if (iov[num].iov_base == NULL)
2401                 return -ENOMEM;
2402         iov[num].iov_len = server->vals->create_lease_size;
2403         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2404         *num_iovec = num + 1;
2405         return 0;
2406 }
2407
2408 static struct create_durable_v2 *
2409 create_durable_v2_buf(struct cifs_open_parms *oparms)
2410 {
2411         struct cifs_fid *pfid = oparms->fid;
2412         struct create_durable_v2 *buf;
2413
2414         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2415         if (!buf)
2416                 return NULL;
2417
2418         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2419                                         (struct create_durable_v2, dcontext));
2420         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2421         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2422                                 (struct create_durable_v2, Name));
2423         buf->ccontext.NameLength = cpu_to_le16(4);
2424
2425         /*
2426          * NB: Handle timeout defaults to 0, which allows server to choose
2427          * (most servers default to 120 seconds) and most clients default to 0.
2428          * This can be overridden at mount ("handletimeout=") if the user wants
2429          * a different persistent (or resilient) handle timeout for all opens
2430          * on a particular SMB3 mount.
2431          */
2432         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2433         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2434
2435         /* for replay, we should not overwrite the existing create guid */
2436         if (!oparms->replay) {
2437                 generate_random_uuid(buf->dcontext.CreateGuid);
2438                 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2439         } else
2440                 memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16);
2441
2442         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2443         buf->Name[0] = 'D';
2444         buf->Name[1] = 'H';
2445         buf->Name[2] = '2';
2446         buf->Name[3] = 'Q';
2447         return buf;
2448 }
2449
2450 static struct create_durable_handle_reconnect_v2 *
2451 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2452 {
2453         struct create_durable_handle_reconnect_v2 *buf;
2454
2455         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2456                         GFP_KERNEL);
2457         if (!buf)
2458                 return NULL;
2459
2460         buf->ccontext.DataOffset =
2461                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2462                                      dcontext));
2463         buf->ccontext.DataLength =
2464                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2465         buf->ccontext.NameOffset =
2466                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2467                             Name));
2468         buf->ccontext.NameLength = cpu_to_le16(4);
2469
2470         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2471         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2472         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2473         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2474
2475         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2476         buf->Name[0] = 'D';
2477         buf->Name[1] = 'H';
2478         buf->Name[2] = '2';
2479         buf->Name[3] = 'C';
2480         return buf;
2481 }
2482
2483 static int
2484 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2485                     struct cifs_open_parms *oparms)
2486 {
2487         unsigned int num = *num_iovec;
2488
2489         iov[num].iov_base = create_durable_v2_buf(oparms);
2490         if (iov[num].iov_base == NULL)
2491                 return -ENOMEM;
2492         iov[num].iov_len = sizeof(struct create_durable_v2);
2493         *num_iovec = num + 1;
2494         return 0;
2495 }
2496
2497 static int
2498 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2499                     struct cifs_open_parms *oparms)
2500 {
2501         unsigned int num = *num_iovec;
2502
2503         /* indicate that we don't need to relock the file */
2504         oparms->reconnect = false;
2505
2506         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2507         if (iov[num].iov_base == NULL)
2508                 return -ENOMEM;
2509         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2510         *num_iovec = num + 1;
2511         return 0;
2512 }
2513
2514 static int
2515 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2516                     struct cifs_open_parms *oparms, bool use_persistent)
2517 {
2518         unsigned int num = *num_iovec;
2519
2520         if (use_persistent) {
2521                 if (oparms->reconnect)
2522                         return add_durable_reconnect_v2_context(iov, num_iovec,
2523                                                                 oparms);
2524                 else
2525                         return add_durable_v2_context(iov, num_iovec, oparms);
2526         }
2527
2528         if (oparms->reconnect) {
2529                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2530                 /* indicate that we don't need to relock the file */
2531                 oparms->reconnect = false;
2532         } else
2533                 iov[num].iov_base = create_durable_buf();
2534         if (iov[num].iov_base == NULL)
2535                 return -ENOMEM;
2536         iov[num].iov_len = sizeof(struct create_durable);
2537         *num_iovec = num + 1;
2538         return 0;
2539 }
2540
2541 /* See MS-SMB2 2.2.13.2.7 */
2542 static struct crt_twarp_ctxt *
2543 create_twarp_buf(__u64 timewarp)
2544 {
2545         struct crt_twarp_ctxt *buf;
2546
2547         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2548         if (!buf)
2549                 return NULL;
2550
2551         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2552                                         (struct crt_twarp_ctxt, Timestamp));
2553         buf->ccontext.DataLength = cpu_to_le32(8);
2554         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2555                                 (struct crt_twarp_ctxt, Name));
2556         buf->ccontext.NameLength = cpu_to_le16(4);
2557         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2558         buf->Name[0] = 'T';
2559         buf->Name[1] = 'W';
2560         buf->Name[2] = 'r';
2561         buf->Name[3] = 'p';
2562         buf->Timestamp = cpu_to_le64(timewarp);
2563         return buf;
2564 }
2565
2566 /* See MS-SMB2 2.2.13.2.7 */
2567 static int
2568 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2569 {
2570         unsigned int num = *num_iovec;
2571
2572         iov[num].iov_base = create_twarp_buf(timewarp);
2573         if (iov[num].iov_base == NULL)
2574                 return -ENOMEM;
2575         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2576         *num_iovec = num + 1;
2577         return 0;
2578 }
2579
2580 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2581 static void setup_owner_group_sids(char *buf)
2582 {
2583         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2584
2585         /* Populate the user ownership fields S-1-5-88-1 */
2586         sids->owner.Revision = 1;
2587         sids->owner.NumAuth = 3;
2588         sids->owner.Authority[5] = 5;
2589         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2590         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2591         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2592
2593         /* Populate the group ownership fields S-1-5-88-2 */
2594         sids->group.Revision = 1;
2595         sids->group.NumAuth = 3;
2596         sids->group.Authority[5] = 5;
2597         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2598         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2599         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2600
2601         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2602 }
2603
2604 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2605 static struct crt_sd_ctxt *
2606 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2607 {
2608         struct crt_sd_ctxt *buf;
2609         __u8 *ptr, *aclptr;
2610         unsigned int acelen, acl_size, ace_count;
2611         unsigned int owner_offset = 0;
2612         unsigned int group_offset = 0;
2613         struct smb3_acl acl = {};
2614
2615         *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2616
2617         if (set_owner) {
2618                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2619                 *len += sizeof(struct owner_group_sids);
2620         }
2621
2622         buf = kzalloc(*len, GFP_KERNEL);
2623         if (buf == NULL)
2624                 return buf;
2625
2626         ptr = (__u8 *)&buf[1];
2627         if (set_owner) {
2628                 /* offset fields are from beginning of security descriptor not of create context */
2629                 owner_offset = ptr - (__u8 *)&buf->sd;
2630                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2631                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2632                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2633
2634                 setup_owner_group_sids(ptr);
2635                 ptr += sizeof(struct owner_group_sids);
2636         } else {
2637                 buf->sd.OffsetOwner = 0;
2638                 buf->sd.OffsetGroup = 0;
2639         }
2640
2641         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2642         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2643         buf->ccontext.NameLength = cpu_to_le16(4);
2644         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2645         buf->Name[0] = 'S';
2646         buf->Name[1] = 'e';
2647         buf->Name[2] = 'c';
2648         buf->Name[3] = 'D';
2649         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2650
2651         /*
2652          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2653          * and "DP" ie the DACL is present
2654          */
2655         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2656
2657         /* offset owner, group and Sbz1 and SACL are all zero */
2658         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2659         /* Ship the ACL for now. we will copy it into buf later. */
2660         aclptr = ptr;
2661         ptr += sizeof(struct smb3_acl);
2662
2663         /* create one ACE to hold the mode embedded in reserved special SID */
2664         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2665         ptr += acelen;
2666         acl_size = acelen + sizeof(struct smb3_acl);
2667         ace_count = 1;
2668
2669         if (set_owner) {
2670                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2671                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2672                 ptr += acelen;
2673                 acl_size += acelen;
2674                 ace_count += 1;
2675         }
2676
2677         /* and one more ACE to allow access for authenticated users */
2678         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2679         ptr += acelen;
2680         acl_size += acelen;
2681         ace_count += 1;
2682
2683         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2684         acl.AclSize = cpu_to_le16(acl_size);
2685         acl.AceCount = cpu_to_le16(ace_count);
2686         /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2687         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2688
2689         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2690         *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2691
2692         return buf;
2693 }
2694
2695 static int
2696 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2697 {
2698         unsigned int num = *num_iovec;
2699         unsigned int len = 0;
2700
2701         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2702         if (iov[num].iov_base == NULL)
2703                 return -ENOMEM;
2704         iov[num].iov_len = len;
2705         *num_iovec = num + 1;
2706         return 0;
2707 }
2708
2709 static struct crt_query_id_ctxt *
2710 create_query_id_buf(void)
2711 {
2712         struct crt_query_id_ctxt *buf;
2713
2714         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2715         if (!buf)
2716                 return NULL;
2717
2718         buf->ccontext.DataOffset = cpu_to_le16(0);
2719         buf->ccontext.DataLength = cpu_to_le32(0);
2720         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2721                                 (struct crt_query_id_ctxt, Name));
2722         buf->ccontext.NameLength = cpu_to_le16(4);
2723         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2724         buf->Name[0] = 'Q';
2725         buf->Name[1] = 'F';
2726         buf->Name[2] = 'i';
2727         buf->Name[3] = 'd';
2728         return buf;
2729 }
2730
2731 /* See MS-SMB2 2.2.13.2.9 */
2732 static int
2733 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2734 {
2735         unsigned int num = *num_iovec;
2736
2737         iov[num].iov_base = create_query_id_buf();
2738         if (iov[num].iov_base == NULL)
2739                 return -ENOMEM;
2740         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2741         *num_iovec = num + 1;
2742         return 0;
2743 }
2744
2745 static void add_ea_context(struct cifs_open_parms *oparms,
2746                            struct kvec *rq_iov, unsigned int *num_iovs)
2747 {
2748         struct kvec *iov = oparms->ea_cctx;
2749
2750         if (iov && iov->iov_base && iov->iov_len) {
2751                 rq_iov[(*num_iovs)++] = *iov;
2752                 memset(iov, 0, sizeof(*iov));
2753         }
2754 }
2755
2756 static int
2757 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2758                             const char *treename, const __le16 *path)
2759 {
2760         int treename_len, path_len;
2761         struct nls_table *cp;
2762         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2763
2764         /*
2765          * skip leading "\\"
2766          */
2767         treename_len = strlen(treename);
2768         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2769                 return -EINVAL;
2770
2771         treename += 2;
2772         treename_len -= 2;
2773
2774         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2775
2776         /* make room for one path separator only if @path isn't empty */
2777         *out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2778
2779         /*
2780          * final path needs to be 8-byte aligned as specified in
2781          * MS-SMB2 2.2.13 SMB2 CREATE Request.
2782          */
2783         *out_size = round_up(*out_len * sizeof(__le16), 8);
2784         *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2785         if (!*out_path)
2786                 return -ENOMEM;
2787
2788         cp = load_nls_default();
2789         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2790
2791         /* Do not append the separator if the path is empty */
2792         if (path[0] != cpu_to_le16(0x0000)) {
2793                 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);
2794                 UniStrcat((wchar_t *)*out_path, (wchar_t *)path);
2795         }
2796
2797         unload_nls(cp);
2798
2799         return 0;
2800 }
2801
2802 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2803                                umode_t mode, struct cifs_tcon *tcon,
2804                                const char *full_path,
2805                                struct cifs_sb_info *cifs_sb)
2806 {
2807         struct smb_rqst rqst;
2808         struct smb2_create_req *req;
2809         struct smb2_create_rsp *rsp = NULL;
2810         struct cifs_ses *ses = tcon->ses;
2811         struct kvec iov[3]; /* make sure at least one for each open context */
2812         struct kvec rsp_iov = {NULL, 0};
2813         int resp_buftype;
2814         int uni_path_len;
2815         __le16 *copy_path = NULL;
2816         int copy_size;
2817         int rc = 0;
2818         unsigned int n_iov = 2;
2819         __u32 file_attributes = 0;
2820         char *pc_buf = NULL;
2821         int flags = 0;
2822         unsigned int total_len;
2823         __le16 *utf16_path = NULL;
2824         struct TCP_Server_Info *server;
2825         int retries = 0, cur_sleep = 1;
2826
2827 replay_again:
2828         /* reinitialize for possible replay */
2829         flags = 0;
2830         n_iov = 2;
2831         server = cifs_pick_channel(ses);
2832
2833         cifs_dbg(FYI, "mkdir\n");
2834
2835         /* resource #1: path allocation */
2836         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2837         if (!utf16_path)
2838                 return -ENOMEM;
2839
2840         if (!ses || !server) {
2841                 rc = -EIO;
2842                 goto err_free_path;
2843         }
2844
2845         /* resource #2: request */
2846         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2847                                  (void **) &req, &total_len);
2848         if (rc)
2849                 goto err_free_path;
2850
2851
2852         if (smb3_encryption_required(tcon))
2853                 flags |= CIFS_TRANSFORM_REQ;
2854
2855         req->ImpersonationLevel = IL_IMPERSONATION;
2856         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2857         /* File attributes ignored on open (used in create though) */
2858         req->FileAttributes = cpu_to_le32(file_attributes);
2859         req->ShareAccess = FILE_SHARE_ALL_LE;
2860         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2861         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2862
2863         iov[0].iov_base = (char *)req;
2864         /* -1 since last byte is buf[0] which is sent below (path) */
2865         iov[0].iov_len = total_len - 1;
2866
2867         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2868
2869         /* [MS-SMB2] 2.2.13 NameOffset:
2870          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2871          * the SMB2 header, the file name includes a prefix that will
2872          * be processed during DFS name normalization as specified in
2873          * section 3.3.5.9. Otherwise, the file name is relative to
2874          * the share that is identified by the TreeId in the SMB2
2875          * header.
2876          */
2877         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2878                 int name_len;
2879
2880                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2881                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2882                                                  &name_len,
2883                                                  tcon->tree_name, utf16_path);
2884                 if (rc)
2885                         goto err_free_req;
2886
2887                 req->NameLength = cpu_to_le16(name_len * 2);
2888                 uni_path_len = copy_size;
2889                 /* free before overwriting resource */
2890                 kfree(utf16_path);
2891                 utf16_path = copy_path;
2892         } else {
2893                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2894                 /* MUST set path len (NameLength) to 0 opening root of share */
2895                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2896                 if (uni_path_len % 8 != 0) {
2897                         copy_size = roundup(uni_path_len, 8);
2898                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2899                         if (!copy_path) {
2900                                 rc = -ENOMEM;
2901                                 goto err_free_req;
2902                         }
2903                         memcpy((char *)copy_path, (const char *)utf16_path,
2904                                uni_path_len);
2905                         uni_path_len = copy_size;
2906                         /* free before overwriting resource */
2907                         kfree(utf16_path);
2908                         utf16_path = copy_path;
2909                 }
2910         }
2911
2912         iov[1].iov_len = uni_path_len;
2913         iov[1].iov_base = utf16_path;
2914         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2915
2916         if (tcon->posix_extensions) {
2917                 /* resource #3: posix buf */
2918                 rc = add_posix_context(iov, &n_iov, mode);
2919                 if (rc)
2920                         goto err_free_req;
2921                 req->CreateContextsOffset = cpu_to_le32(
2922                         sizeof(struct smb2_create_req) +
2923                         iov[1].iov_len);
2924                 pc_buf = iov[n_iov-1].iov_base;
2925         }
2926
2927
2928         memset(&rqst, 0, sizeof(struct smb_rqst));
2929         rqst.rq_iov = iov;
2930         rqst.rq_nvec = n_iov;
2931
2932         /* no need to inc num_remote_opens because we close it just below */
2933         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
2934                                     FILE_WRITE_ATTRIBUTES);
2935
2936         if (retries)
2937                 smb2_set_replay(server, &rqst);
2938
2939         /* resource #4: response buffer */
2940         rc = cifs_send_recv(xid, ses, server,
2941                             &rqst, &resp_buftype, flags, &rsp_iov);
2942         if (rc) {
2943                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2944                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2945                                            CREATE_NOT_FILE,
2946                                            FILE_WRITE_ATTRIBUTES, rc);
2947                 goto err_free_rsp_buf;
2948         }
2949
2950         /*
2951          * Although unlikely to be possible for rsp to be null and rc not set,
2952          * adding check below is slightly safer long term (and quiets Coverity
2953          * warning)
2954          */
2955         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2956         if (rsp == NULL) {
2957                 rc = -EIO;
2958                 kfree(pc_buf);
2959                 goto err_free_req;
2960         }
2961
2962         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2963                                     CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2964
2965         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2966
2967         /* Eventually save off posix specific response info and timestaps */
2968
2969 err_free_rsp_buf:
2970         free_rsp_buf(resp_buftype, rsp);
2971         kfree(pc_buf);
2972 err_free_req:
2973         cifs_small_buf_release(req);
2974 err_free_path:
2975         kfree(utf16_path);
2976
2977         if (is_replayable_error(rc) &&
2978             smb2_should_replay(tcon, &retries, &cur_sleep))
2979                 goto replay_again;
2980
2981         return rc;
2982 }
2983
2984 int
2985 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2986                struct smb_rqst *rqst, __u8 *oplock,
2987                struct cifs_open_parms *oparms, __le16 *path)
2988 {
2989         struct smb2_create_req *req;
2990         unsigned int n_iov = 2;
2991         __u32 file_attributes = 0;
2992         int copy_size;
2993         int uni_path_len;
2994         unsigned int total_len;
2995         struct kvec *iov = rqst->rq_iov;
2996         __le16 *copy_path;
2997         int rc;
2998
2999         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
3000                                  (void **) &req, &total_len);
3001         if (rc)
3002                 return rc;
3003
3004         iov[0].iov_base = (char *)req;
3005         /* -1 since last byte is buf[0] which is sent below (path) */
3006         iov[0].iov_len = total_len - 1;
3007
3008         if (oparms->create_options & CREATE_OPTION_READONLY)
3009                 file_attributes |= ATTR_READONLY;
3010         if (oparms->create_options & CREATE_OPTION_SPECIAL)
3011                 file_attributes |= ATTR_SYSTEM;
3012
3013         req->ImpersonationLevel = IL_IMPERSONATION;
3014         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
3015         /* File attributes ignored on open (used in create though) */
3016         req->FileAttributes = cpu_to_le32(file_attributes);
3017         req->ShareAccess = FILE_SHARE_ALL_LE;
3018
3019         req->CreateDisposition = cpu_to_le32(oparms->disposition);
3020         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
3021         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
3022
3023         /* [MS-SMB2] 2.2.13 NameOffset:
3024          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
3025          * the SMB2 header, the file name includes a prefix that will
3026          * be processed during DFS name normalization as specified in
3027          * section 3.3.5.9. Otherwise, the file name is relative to
3028          * the share that is identified by the TreeId in the SMB2
3029          * header.
3030          */
3031         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
3032                 int name_len;
3033
3034                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
3035                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
3036                                                  &name_len,
3037                                                  tcon->tree_name, path);
3038                 if (rc)
3039                         return rc;
3040                 req->NameLength = cpu_to_le16(name_len * 2);
3041                 uni_path_len = copy_size;
3042                 path = copy_path;
3043         } else {
3044                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
3045                 /* MUST set path len (NameLength) to 0 opening root of share */
3046                 req->NameLength = cpu_to_le16(uni_path_len - 2);
3047                 copy_size = round_up(uni_path_len, 8);
3048                 copy_path = kzalloc(copy_size, GFP_KERNEL);
3049                 if (!copy_path)
3050                         return -ENOMEM;
3051                 memcpy((char *)copy_path, (const char *)path,
3052                        uni_path_len);
3053                 uni_path_len = copy_size;
3054                 path = copy_path;
3055         }
3056
3057         iov[1].iov_len = uni_path_len;
3058         iov[1].iov_base = path;
3059
3060         if ((!server->oplocks) || (tcon->no_lease))
3061                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
3062
3063         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
3064             *oplock == SMB2_OPLOCK_LEVEL_NONE)
3065                 req->RequestedOplockLevel = *oplock;
3066         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
3067                   (oparms->create_options & CREATE_NOT_FILE))
3068                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
3069         else {
3070                 rc = add_lease_context(server, req, iov, &n_iov,
3071                                        oparms->fid->lease_key, oplock);
3072                 if (rc)
3073                         return rc;
3074         }
3075
3076         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3077                 rc = add_durable_context(iov, &n_iov, oparms,
3078                                         tcon->use_persistent);
3079                 if (rc)
3080                         return rc;
3081         }
3082
3083         if (tcon->posix_extensions) {
3084                 rc = add_posix_context(iov, &n_iov, oparms->mode);
3085                 if (rc)
3086                         return rc;
3087         }
3088
3089         if (tcon->snapshot_time) {
3090                 cifs_dbg(FYI, "adding snapshot context\n");
3091                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
3092                 if (rc)
3093                         return rc;
3094         }
3095
3096         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
3097                 bool set_mode;
3098                 bool set_owner;
3099
3100                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
3101                     (oparms->mode != ACL_NO_MODE))
3102                         set_mode = true;
3103                 else {
3104                         set_mode = false;
3105                         oparms->mode = ACL_NO_MODE;
3106                 }
3107
3108                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
3109                         set_owner = true;
3110                 else
3111                         set_owner = false;
3112
3113                 if (set_owner | set_mode) {
3114                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
3115                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
3116                         if (rc)
3117                                 return rc;
3118                 }
3119         }
3120
3121         add_query_id_context(iov, &n_iov);
3122         add_ea_context(oparms, iov, &n_iov);
3123
3124         if (n_iov > 2) {
3125                 /*
3126                  * We have create contexts behind iov[1] (the file
3127                  * name), point at them from the main create request
3128                  */
3129                 req->CreateContextsOffset = cpu_to_le32(
3130                         sizeof(struct smb2_create_req) +
3131                         iov[1].iov_len);
3132                 req->CreateContextsLength = 0;
3133
3134                 for (unsigned int i = 2; i < (n_iov-1); i++) {
3135                         struct kvec *v = &iov[i];
3136                         size_t len = v->iov_len;
3137                         struct create_context *cctx =
3138                                 (struct create_context *)v->iov_base;
3139
3140                         cctx->Next = cpu_to_le32(len);
3141                         le32_add_cpu(&req->CreateContextsLength, len);
3142                 }
3143                 le32_add_cpu(&req->CreateContextsLength,
3144                              iov[n_iov-1].iov_len);
3145         }
3146
3147         rqst->rq_nvec = n_iov;
3148         return 0;
3149 }
3150
3151 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
3152  * All other vectors are freed by kfree().
3153  */
3154 void
3155 SMB2_open_free(struct smb_rqst *rqst)
3156 {
3157         int i;
3158
3159         if (rqst && rqst->rq_iov) {
3160                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
3161                 for (i = 1; i < rqst->rq_nvec; i++)
3162                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3163                                 kfree(rqst->rq_iov[i].iov_base);
3164         }
3165 }
3166
3167 int
3168 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
3169           __u8 *oplock, struct smb2_file_all_info *buf,
3170           struct create_posix_rsp *posix,
3171           struct kvec *err_iov, int *buftype)
3172 {
3173         struct smb_rqst rqst;
3174         struct smb2_create_rsp *rsp = NULL;
3175         struct cifs_tcon *tcon = oparms->tcon;
3176         struct cifs_ses *ses = tcon->ses;
3177         struct TCP_Server_Info *server;
3178         struct kvec iov[SMB2_CREATE_IOV_SIZE];
3179         struct kvec rsp_iov = {NULL, 0};
3180         int resp_buftype = CIFS_NO_BUFFER;
3181         int rc = 0;
3182         int flags = 0;
3183         int retries = 0, cur_sleep = 1;
3184
3185 replay_again:
3186         /* reinitialize for possible replay */
3187         flags = 0;
3188         server = cifs_pick_channel(ses);
3189         oparms->replay = !!(retries);
3190
3191         cifs_dbg(FYI, "create/open\n");
3192         if (!ses || !server)
3193                 return -EIO;
3194
3195         if (smb3_encryption_required(tcon))
3196                 flags |= CIFS_TRANSFORM_REQ;
3197
3198         memset(&rqst, 0, sizeof(struct smb_rqst));
3199         memset(&iov, 0, sizeof(iov));
3200         rqst.rq_iov = iov;
3201         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
3202
3203         rc = SMB2_open_init(tcon, server,
3204                             &rqst, oplock, oparms, path);
3205         if (rc)
3206                 goto creat_exit;
3207
3208         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
3209                 oparms->create_options, oparms->desired_access);
3210
3211         if (retries)
3212                 smb2_set_replay(server, &rqst);
3213
3214         rc = cifs_send_recv(xid, ses, server,
3215                             &rqst, &resp_buftype, flags,
3216                             &rsp_iov);
3217         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3218
3219         if (rc != 0) {
3220                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3221                 if (err_iov && rsp) {
3222                         *err_iov = rsp_iov;
3223                         *buftype = resp_buftype;
3224                         resp_buftype = CIFS_NO_BUFFER;
3225                         rsp = NULL;
3226                 }
3227                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3228                                     oparms->create_options, oparms->desired_access, rc);
3229                 if (rc == -EREMCHG) {
3230                         pr_warn_once("server share %s deleted\n",
3231                                      tcon->tree_name);
3232                         tcon->need_reconnect = true;
3233                 }
3234                 goto creat_exit;
3235         } else if (rsp == NULL) /* unlikely to happen, but safer to check */
3236                 goto creat_exit;
3237         else
3238                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3239                                      oparms->create_options, oparms->desired_access);
3240
3241         atomic_inc(&tcon->num_remote_opens);
3242         oparms->fid->persistent_fid = rsp->PersistentFileId;
3243         oparms->fid->volatile_fid = rsp->VolatileFileId;
3244         oparms->fid->access = oparms->desired_access;
3245 #ifdef CONFIG_CIFS_DEBUG2
3246         oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3247 #endif /* CIFS_DEBUG2 */
3248
3249         if (buf) {
3250                 buf->CreationTime = rsp->CreationTime;
3251                 buf->LastAccessTime = rsp->LastAccessTime;
3252                 buf->LastWriteTime = rsp->LastWriteTime;
3253                 buf->ChangeTime = rsp->ChangeTime;
3254                 buf->AllocationSize = rsp->AllocationSize;
3255                 buf->EndOfFile = rsp->EndofFile;
3256                 buf->Attributes = rsp->FileAttributes;
3257                 buf->NumberOfLinks = cpu_to_le32(1);
3258                 buf->DeletePending = 0;
3259         }
3260
3261
3262         rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
3263                                  oparms->fid->lease_key, oplock, buf, posix);
3264 creat_exit:
3265         SMB2_open_free(&rqst);
3266         free_rsp_buf(resp_buftype, rsp);
3267
3268         if (is_replayable_error(rc) &&
3269             smb2_should_replay(tcon, &retries, &cur_sleep))
3270                 goto replay_again;
3271
3272         return rc;
3273 }
3274
3275 int
3276 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3277                 struct smb_rqst *rqst,
3278                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
3279                 char *in_data, u32 indatalen,
3280                 __u32 max_response_size)
3281 {
3282         struct smb2_ioctl_req *req;
3283         struct kvec *iov = rqst->rq_iov;
3284         unsigned int total_len;
3285         int rc;
3286         char *in_data_buf;
3287
3288         rc = smb2_ioctl_req_init(opcode, tcon, server,
3289                                  (void **) &req, &total_len);
3290         if (rc)
3291                 return rc;
3292
3293         if (indatalen) {
3294                 /*
3295                  * indatalen is usually small at a couple of bytes max, so
3296                  * just allocate through generic pool
3297                  */
3298                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3299                 if (!in_data_buf) {
3300                         cifs_small_buf_release(req);
3301                         return -ENOMEM;
3302                 }
3303         }
3304
3305         req->CtlCode = cpu_to_le32(opcode);
3306         req->PersistentFileId = persistent_fid;
3307         req->VolatileFileId = volatile_fid;
3308
3309         iov[0].iov_base = (char *)req;
3310         /*
3311          * If no input data, the size of ioctl struct in
3312          * protocol spec still includes a 1 byte data buffer,
3313          * but if input data passed to ioctl, we do not
3314          * want to double count this, so we do not send
3315          * the dummy one byte of data in iovec[0] if sending
3316          * input data (in iovec[1]).
3317          */
3318         if (indatalen) {
3319                 req->InputCount = cpu_to_le32(indatalen);
3320                 /* do not set InputOffset if no input data */
3321                 req->InputOffset =
3322                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3323                 rqst->rq_nvec = 2;
3324                 iov[0].iov_len = total_len - 1;
3325                 iov[1].iov_base = in_data_buf;
3326                 iov[1].iov_len = indatalen;
3327         } else {
3328                 rqst->rq_nvec = 1;
3329                 iov[0].iov_len = total_len;
3330         }
3331
3332         req->OutputOffset = 0;
3333         req->OutputCount = 0; /* MBZ */
3334
3335         /*
3336          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3337          * We Could increase default MaxOutputResponse, but that could require
3338          * more credits. Windows typically sets this smaller, but for some
3339          * ioctls it may be useful to allow server to send more. No point
3340          * limiting what the server can send as long as fits in one credit
3341          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3342          * to increase this limit up in the future.
3343          * Note that for snapshot queries that servers like Azure expect that
3344          * the first query be minimal size (and just used to get the number/size
3345          * of previous versions) so response size must be specified as EXACTLY
3346          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3347          * of eight bytes.  Currently that is the only case where we set max
3348          * response size smaller.
3349          */
3350         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3351         req->hdr.CreditCharge =
3352                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3353                                          SMB2_MAX_BUFFER_SIZE));
3354         /* always an FSCTL (for now) */
3355         req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3356
3357         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3358         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3359                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3360
3361         return 0;
3362 }
3363
3364 void
3365 SMB2_ioctl_free(struct smb_rqst *rqst)
3366 {
3367         int i;
3368
3369         if (rqst && rqst->rq_iov) {
3370                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3371                 for (i = 1; i < rqst->rq_nvec; i++)
3372                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3373                                 kfree(rqst->rq_iov[i].iov_base);
3374         }
3375 }
3376
3377
3378 /*
3379  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3380  */
3381 int
3382 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3383            u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3384            u32 max_out_data_len, char **out_data,
3385            u32 *plen /* returned data len */)
3386 {
3387         struct smb_rqst rqst;
3388         struct smb2_ioctl_rsp *rsp = NULL;
3389         struct cifs_ses *ses;
3390         struct TCP_Server_Info *server;
3391         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3392         struct kvec rsp_iov = {NULL, 0};
3393         int resp_buftype = CIFS_NO_BUFFER;
3394         int rc = 0;
3395         int flags = 0;
3396         int retries = 0, cur_sleep = 1;
3397
3398         if (!tcon)
3399                 return -EIO;
3400
3401         ses = tcon->ses;
3402         if (!ses)
3403                 return -EIO;
3404
3405 replay_again:
3406         /* reinitialize for possible replay */
3407         flags = 0;
3408         server = cifs_pick_channel(ses);
3409
3410         if (!server)
3411                 return -EIO;
3412
3413         cifs_dbg(FYI, "SMB2 IOCTL\n");
3414
3415         if (out_data != NULL)
3416                 *out_data = NULL;
3417
3418         /* zero out returned data len, in case of error */
3419         if (plen)
3420                 *plen = 0;
3421
3422         if (smb3_encryption_required(tcon))
3423                 flags |= CIFS_TRANSFORM_REQ;
3424
3425         memset(&rqst, 0, sizeof(struct smb_rqst));
3426         memset(&iov, 0, sizeof(iov));
3427         rqst.rq_iov = iov;
3428         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3429
3430         rc = SMB2_ioctl_init(tcon, server,
3431                              &rqst, persistent_fid, volatile_fid, opcode,
3432                              in_data, indatalen, max_out_data_len);
3433         if (rc)
3434                 goto ioctl_exit;
3435
3436         if (retries)
3437                 smb2_set_replay(server, &rqst);
3438
3439         rc = cifs_send_recv(xid, ses, server,
3440                             &rqst, &resp_buftype, flags,
3441                             &rsp_iov);
3442         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3443
3444         if (rc != 0)
3445                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3446                                 ses->Suid, 0, opcode, rc);
3447
3448         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3449                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3450                 goto ioctl_exit;
3451         } else if (rc == -EINVAL) {
3452                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3453                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3454                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3455                         goto ioctl_exit;
3456                 }
3457         } else if (rc == -E2BIG) {
3458                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3459                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3460                         goto ioctl_exit;
3461                 }
3462         }
3463
3464         /* check if caller wants to look at return data or just return rc */
3465         if ((plen == NULL) || (out_data == NULL))
3466                 goto ioctl_exit;
3467
3468         /*
3469          * Although unlikely to be possible for rsp to be null and rc not set,
3470          * adding check below is slightly safer long term (and quiets Coverity
3471          * warning)
3472          */
3473         if (rsp == NULL) {
3474                 rc = -EIO;
3475                 goto ioctl_exit;
3476         }
3477
3478         *plen = le32_to_cpu(rsp->OutputCount);
3479
3480         /* We check for obvious errors in the output buffer length and offset */
3481         if (*plen == 0)
3482                 goto ioctl_exit; /* server returned no data */
3483         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3484                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3485                 *plen = 0;
3486                 rc = -EIO;
3487                 goto ioctl_exit;
3488         }
3489
3490         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3491                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3492                         le32_to_cpu(rsp->OutputOffset));
3493                 *plen = 0;
3494                 rc = -EIO;
3495                 goto ioctl_exit;
3496         }
3497
3498         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3499                             *plen, GFP_KERNEL);
3500         if (*out_data == NULL) {
3501                 rc = -ENOMEM;
3502                 goto ioctl_exit;
3503         }
3504
3505 ioctl_exit:
3506         SMB2_ioctl_free(&rqst);
3507         free_rsp_buf(resp_buftype, rsp);
3508
3509         if (is_replayable_error(rc) &&
3510             smb2_should_replay(tcon, &retries, &cur_sleep))
3511                 goto replay_again;
3512
3513         return rc;
3514 }
3515
3516 /*
3517  *   Individual callers to ioctl worker function follow
3518  */
3519
3520 int
3521 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3522                      u64 persistent_fid, u64 volatile_fid)
3523 {
3524         int rc;
3525         struct  compress_ioctl fsctl_input;
3526         char *ret_data = NULL;
3527
3528         fsctl_input.CompressionState =
3529                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3530
3531         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3532                         FSCTL_SET_COMPRESSION,
3533                         (char *)&fsctl_input /* data input */,
3534                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3535                         &ret_data /* out data */, NULL);
3536
3537         cifs_dbg(FYI, "set compression rc %d\n", rc);
3538
3539         return rc;
3540 }
3541
3542 int
3543 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3544                 struct smb_rqst *rqst,
3545                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3546 {
3547         struct smb2_close_req *req;
3548         struct kvec *iov = rqst->rq_iov;
3549         unsigned int total_len;
3550         int rc;
3551
3552         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3553                                  (void **) &req, &total_len);
3554         if (rc)
3555                 return rc;
3556
3557         req->PersistentFileId = persistent_fid;
3558         req->VolatileFileId = volatile_fid;
3559         if (query_attrs)
3560                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3561         else
3562                 req->Flags = 0;
3563         iov[0].iov_base = (char *)req;
3564         iov[0].iov_len = total_len;
3565
3566         return 0;
3567 }
3568
3569 void
3570 SMB2_close_free(struct smb_rqst *rqst)
3571 {
3572         if (rqst && rqst->rq_iov)
3573                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3574 }
3575
3576 int
3577 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3578              u64 persistent_fid, u64 volatile_fid,
3579              struct smb2_file_network_open_info *pbuf)
3580 {
3581         struct smb_rqst rqst;
3582         struct smb2_close_rsp *rsp = NULL;
3583         struct cifs_ses *ses = tcon->ses;
3584         struct TCP_Server_Info *server;
3585         struct kvec iov[1];
3586         struct kvec rsp_iov;
3587         int resp_buftype = CIFS_NO_BUFFER;
3588         int rc = 0;
3589         int flags = 0;
3590         bool query_attrs = false;
3591         int retries = 0, cur_sleep = 1;
3592
3593 replay_again:
3594         /* reinitialize for possible replay */
3595         flags = 0;
3596         query_attrs = false;
3597         server = cifs_pick_channel(ses);
3598
3599         cifs_dbg(FYI, "Close\n");
3600
3601         if (!ses || !server)
3602                 return -EIO;
3603
3604         if (smb3_encryption_required(tcon))
3605                 flags |= CIFS_TRANSFORM_REQ;
3606
3607         memset(&rqst, 0, sizeof(struct smb_rqst));
3608         memset(&iov, 0, sizeof(iov));
3609         rqst.rq_iov = iov;
3610         rqst.rq_nvec = 1;
3611
3612         /* check if need to ask server to return timestamps in close response */
3613         if (pbuf)
3614                 query_attrs = true;
3615
3616         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3617         rc = SMB2_close_init(tcon, server,
3618                              &rqst, persistent_fid, volatile_fid,
3619                              query_attrs);
3620         if (rc)
3621                 goto close_exit;
3622
3623         if (retries)
3624                 smb2_set_replay(server, &rqst);
3625
3626         rc = cifs_send_recv(xid, ses, server,
3627                             &rqst, &resp_buftype, flags, &rsp_iov);
3628         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3629
3630         if (rc != 0) {
3631                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3632                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3633                                      rc);
3634                 goto close_exit;
3635         } else {
3636                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3637                                       ses->Suid);
3638                 if (pbuf)
3639                         memcpy(&pbuf->network_open_info,
3640                                &rsp->network_open_info,
3641                                sizeof(pbuf->network_open_info));
3642                 atomic_dec(&tcon->num_remote_opens);
3643         }
3644
3645 close_exit:
3646         SMB2_close_free(&rqst);
3647         free_rsp_buf(resp_buftype, rsp);
3648
3649         /* retry close in a worker thread if this one is interrupted */
3650         if (is_interrupt_error(rc)) {
3651                 int tmp_rc;
3652
3653                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3654                                                      volatile_fid);
3655                 if (tmp_rc)
3656                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3657                                  persistent_fid, tmp_rc);
3658         }
3659
3660         if (is_replayable_error(rc) &&
3661             smb2_should_replay(tcon, &retries, &cur_sleep))
3662                 goto replay_again;
3663
3664         return rc;
3665 }
3666
3667 int
3668 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3669                 u64 persistent_fid, u64 volatile_fid)
3670 {
3671         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3672 }
3673
3674 int
3675 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3676                   struct kvec *iov, unsigned int min_buf_size)
3677 {
3678         unsigned int smb_len = iov->iov_len;
3679         char *end_of_smb = smb_len + (char *)iov->iov_base;
3680         char *begin_of_buf = offset + (char *)iov->iov_base;
3681         char *end_of_buf = begin_of_buf + buffer_length;
3682
3683
3684         if (buffer_length < min_buf_size) {
3685                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3686                          buffer_length, min_buf_size);
3687                 return -EINVAL;
3688         }
3689
3690         /* check if beyond RFC1001 maximum length */
3691         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3692                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3693                          buffer_length, smb_len);
3694                 return -EINVAL;
3695         }
3696
3697         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3698                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3699                 return -EINVAL;
3700         }
3701
3702         return 0;
3703 }
3704
3705 /*
3706  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3707  * Caller must free buffer.
3708  */
3709 int
3710 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3711                            struct kvec *iov, unsigned int minbufsize,
3712                            char *data)
3713 {
3714         char *begin_of_buf = offset + (char *)iov->iov_base;
3715         int rc;
3716
3717         if (!data)
3718                 return -EINVAL;
3719
3720         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3721         if (rc)
3722                 return rc;
3723
3724         memcpy(data, begin_of_buf, minbufsize);
3725
3726         return 0;
3727 }
3728
3729 int
3730 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3731                      struct smb_rqst *rqst,
3732                      u64 persistent_fid, u64 volatile_fid,
3733                      u8 info_class, u8 info_type, u32 additional_info,
3734                      size_t output_len, size_t input_len, void *input)
3735 {
3736         struct smb2_query_info_req *req;
3737         struct kvec *iov = rqst->rq_iov;
3738         unsigned int total_len;
3739         size_t len;
3740         int rc;
3741
3742         if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
3743                      len > CIFSMaxBufSize))
3744                 return -EINVAL;
3745
3746         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3747                                  (void **) &req, &total_len);
3748         if (rc)
3749                 return rc;
3750
3751         req->InfoType = info_type;
3752         req->FileInfoClass = info_class;
3753         req->PersistentFileId = persistent_fid;
3754         req->VolatileFileId = volatile_fid;
3755         req->AdditionalInformation = cpu_to_le32(additional_info);
3756
3757         req->OutputBufferLength = cpu_to_le32(output_len);
3758         if (input_len) {
3759                 req->InputBufferLength = cpu_to_le32(input_len);
3760                 /* total_len for smb query request never close to le16 max */
3761                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3762                 memcpy(req->Buffer, input, input_len);
3763         }
3764
3765         iov[0].iov_base = (char *)req;
3766         /* 1 for Buffer */
3767         iov[0].iov_len = len;
3768         return 0;
3769 }
3770
3771 void
3772 SMB2_query_info_free(struct smb_rqst *rqst)
3773 {
3774         if (rqst && rqst->rq_iov)
3775                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3776 }
3777
3778 static int
3779 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3780            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3781            u32 additional_info, size_t output_len, size_t min_len, void **data,
3782                 u32 *dlen)
3783 {
3784         struct smb_rqst rqst;
3785         struct smb2_query_info_rsp *rsp = NULL;
3786         struct kvec iov[1];
3787         struct kvec rsp_iov;
3788         int rc = 0;
3789         int resp_buftype = CIFS_NO_BUFFER;
3790         struct cifs_ses *ses = tcon->ses;
3791         struct TCP_Server_Info *server;
3792         int flags = 0;
3793         bool allocated = false;
3794         int retries = 0, cur_sleep = 1;
3795
3796         cifs_dbg(FYI, "Query Info\n");
3797
3798         if (!ses)
3799                 return -EIO;
3800
3801 replay_again:
3802         /* reinitialize for possible replay */
3803         flags = 0;
3804         allocated = false;
3805         server = cifs_pick_channel(ses);
3806
3807         if (!server)
3808                 return -EIO;
3809
3810         if (smb3_encryption_required(tcon))
3811                 flags |= CIFS_TRANSFORM_REQ;
3812
3813         memset(&rqst, 0, sizeof(struct smb_rqst));
3814         memset(&iov, 0, sizeof(iov));
3815         rqst.rq_iov = iov;
3816         rqst.rq_nvec = 1;
3817
3818         rc = SMB2_query_info_init(tcon, server,
3819                                   &rqst, persistent_fid, volatile_fid,
3820                                   info_class, info_type, additional_info,
3821                                   output_len, 0, NULL);
3822         if (rc)
3823                 goto qinf_exit;
3824
3825         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3826                                     ses->Suid, info_class, (__u32)info_type);
3827
3828         if (retries)
3829                 smb2_set_replay(server, &rqst);
3830
3831         rc = cifs_send_recv(xid, ses, server,
3832                             &rqst, &resp_buftype, flags, &rsp_iov);
3833         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3834
3835         if (rc) {
3836                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3837                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3838                                 ses->Suid, info_class, (__u32)info_type, rc);
3839                 goto qinf_exit;
3840         }
3841
3842         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3843                                 ses->Suid, info_class, (__u32)info_type);
3844
3845         if (dlen) {
3846                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3847                 if (!*data) {
3848                         *data = kmalloc(*dlen, GFP_KERNEL);
3849                         if (!*data) {
3850                                 cifs_tcon_dbg(VFS,
3851                                         "Error %d allocating memory for acl\n",
3852                                         rc);
3853                                 *dlen = 0;
3854                                 rc = -ENOMEM;
3855                                 goto qinf_exit;
3856                         }
3857                         allocated = true;
3858                 }
3859         }
3860
3861         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3862                                         le32_to_cpu(rsp->OutputBufferLength),
3863                                         &rsp_iov, dlen ? *dlen : min_len, *data);
3864         if (rc && allocated) {
3865                 kfree(*data);
3866                 *data = NULL;
3867                 *dlen = 0;
3868         }
3869
3870 qinf_exit:
3871         SMB2_query_info_free(&rqst);
3872         free_rsp_buf(resp_buftype, rsp);
3873
3874         if (is_replayable_error(rc) &&
3875             smb2_should_replay(tcon, &retries, &cur_sleep))
3876                 goto replay_again;
3877
3878         return rc;
3879 }
3880
3881 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3882         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3883 {
3884         return query_info(xid, tcon, persistent_fid, volatile_fid,
3885                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3886                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3887                           sizeof(struct smb2_file_all_info), (void **)&data,
3888                           NULL);
3889 }
3890
3891 #if 0
3892 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3893 int
3894 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3895                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3896 {
3897         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3898                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3899         *plen = 0;
3900
3901         return query_info(xid, tcon, persistent_fid, volatile_fid,
3902                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3903                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3904         /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3905 }
3906 #endif
3907
3908 int
3909 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3910                u64 persistent_fid, u64 volatile_fid,
3911                void **data, u32 *plen, u32 extra_info)
3912 {
3913         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3914                                 extra_info;
3915         *plen = 0;
3916
3917         return query_info(xid, tcon, persistent_fid, volatile_fid,
3918                           0, SMB2_O_INFO_SECURITY, additional_info,
3919                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3920 }
3921
3922 int
3923 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3924                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3925 {
3926         return query_info(xid, tcon, persistent_fid, volatile_fid,
3927                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3928                           sizeof(struct smb2_file_internal_info),
3929                           sizeof(struct smb2_file_internal_info),
3930                           (void **)&uniqueid, NULL);
3931 }
3932
3933 /*
3934  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3935  * See MS-SMB2 2.2.35 and 2.2.36
3936  */
3937
3938 static int
3939 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3940                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3941                  u64 persistent_fid, u64 volatile_fid,
3942                  u32 completion_filter, bool watch_tree)
3943 {
3944         struct smb2_change_notify_req *req;
3945         struct kvec *iov = rqst->rq_iov;
3946         unsigned int total_len;
3947         int rc;
3948
3949         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3950                                  (void **) &req, &total_len);
3951         if (rc)
3952                 return rc;
3953
3954         req->PersistentFileId = persistent_fid;
3955         req->VolatileFileId = volatile_fid;
3956         /* See note 354 of MS-SMB2, 64K max */
3957         req->OutputBufferLength =
3958                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3959         req->CompletionFilter = cpu_to_le32(completion_filter);
3960         if (watch_tree)
3961                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3962         else
3963                 req->Flags = 0;
3964
3965         iov[0].iov_base = (char *)req;
3966         iov[0].iov_len = total_len;
3967
3968         return 0;
3969 }
3970
3971 int
3972 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3973                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3974                 u32 completion_filter, u32 max_out_data_len, char **out_data,
3975                 u32 *plen /* returned data len */)
3976 {
3977         struct cifs_ses *ses = tcon->ses;
3978         struct TCP_Server_Info *server;
3979         struct smb_rqst rqst;
3980         struct smb2_change_notify_rsp *smb_rsp;
3981         struct kvec iov[1];
3982         struct kvec rsp_iov = {NULL, 0};
3983         int resp_buftype = CIFS_NO_BUFFER;
3984         int flags = 0;
3985         int rc = 0;
3986         int retries = 0, cur_sleep = 1;
3987
3988 replay_again:
3989         /* reinitialize for possible replay */
3990         flags = 0;
3991         server = cifs_pick_channel(ses);
3992
3993         cifs_dbg(FYI, "change notify\n");
3994         if (!ses || !server)
3995                 return -EIO;
3996
3997         if (smb3_encryption_required(tcon))
3998                 flags |= CIFS_TRANSFORM_REQ;
3999
4000         memset(&rqst, 0, sizeof(struct smb_rqst));
4001         memset(&iov, 0, sizeof(iov));
4002         if (plen)
4003                 *plen = 0;
4004
4005         rqst.rq_iov = iov;
4006         rqst.rq_nvec = 1;
4007
4008         rc = SMB2_notify_init(xid, &rqst, tcon, server,
4009                               persistent_fid, volatile_fid,
4010                               completion_filter, watch_tree);
4011         if (rc)
4012                 goto cnotify_exit;
4013
4014         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
4015                                 (u8)watch_tree, completion_filter);
4016
4017         if (retries)
4018                 smb2_set_replay(server, &rqst);
4019
4020         rc = cifs_send_recv(xid, ses, server,
4021                             &rqst, &resp_buftype, flags, &rsp_iov);
4022
4023         if (rc != 0) {
4024                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
4025                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
4026                                 (u8)watch_tree, completion_filter, rc);
4027         } else {
4028                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
4029                         ses->Suid, (u8)watch_tree, completion_filter);
4030                 /* validate that notify information is plausible */
4031                 if ((rsp_iov.iov_base == NULL) ||
4032                     (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
4033                         goto cnotify_exit;
4034
4035                 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
4036
4037                 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
4038                                 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
4039                                 sizeof(struct file_notify_information));
4040
4041                 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
4042                                 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
4043                 if (*out_data == NULL) {
4044                         rc = -ENOMEM;
4045                         goto cnotify_exit;
4046                 } else if (plen)
4047                         *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
4048         }
4049
4050  cnotify_exit:
4051         if (rqst.rq_iov)
4052                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
4053         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4054
4055         if (is_replayable_error(rc) &&
4056             smb2_should_replay(tcon, &retries, &cur_sleep))
4057                 goto replay_again;
4058
4059         return rc;
4060 }
4061
4062
4063
4064 /*
4065  * This is a no-op for now. We're not really interested in the reply, but
4066  * rather in the fact that the server sent one and that server->lstrp
4067  * gets updated.
4068  *
4069  * FIXME: maybe we should consider checking that the reply matches request?
4070  */
4071 static void
4072 smb2_echo_callback(struct mid_q_entry *mid)
4073 {
4074         struct TCP_Server_Info *server = mid->callback_data;
4075         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
4076         struct cifs_credits credits = { .value = 0, .instance = 0 };
4077
4078         if (mid->mid_state == MID_RESPONSE_RECEIVED
4079             || mid->mid_state == MID_RESPONSE_MALFORMED) {
4080                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4081                 credits.instance = server->reconnect_instance;
4082         }
4083
4084         release_mid(mid);
4085         add_credits(server, &credits, CIFS_ECHO_OP);
4086 }
4087
4088 void smb2_reconnect_server(struct work_struct *work)
4089 {
4090         struct TCP_Server_Info *server = container_of(work,
4091                                         struct TCP_Server_Info, reconnect.work);
4092         struct TCP_Server_Info *pserver;
4093         struct cifs_ses *ses, *ses2;
4094         struct cifs_tcon *tcon, *tcon2;
4095         struct list_head tmp_list, tmp_ses_list;
4096         bool ses_exist = false;
4097         bool tcon_selected = false;
4098         int rc;
4099         bool resched = false;
4100
4101         /* first check if ref count has reached 0, if not inc ref count */
4102         spin_lock(&cifs_tcp_ses_lock);
4103         if (!server->srv_count) {
4104                 spin_unlock(&cifs_tcp_ses_lock);
4105                 return;
4106         }
4107         server->srv_count++;
4108         spin_unlock(&cifs_tcp_ses_lock);
4109
4110         /* If server is a channel, select the primary channel */
4111         pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
4112
4113         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
4114         mutex_lock(&pserver->reconnect_mutex);
4115
4116         /* if the server is marked for termination, drop the ref count here */
4117         if (server->terminate) {
4118                 cifs_put_tcp_session(server, true);
4119                 mutex_unlock(&pserver->reconnect_mutex);
4120                 return;
4121         }
4122
4123         INIT_LIST_HEAD(&tmp_list);
4124         INIT_LIST_HEAD(&tmp_ses_list);
4125         cifs_dbg(FYI, "Reconnecting tcons and channels\n");
4126
4127         spin_lock(&cifs_tcp_ses_lock);
4128         list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
4129                 spin_lock(&ses->ses_lock);
4130                 if (ses->ses_status == SES_EXITING) {
4131                         spin_unlock(&ses->ses_lock);
4132                         continue;
4133                 }
4134                 spin_unlock(&ses->ses_lock);
4135
4136                 tcon_selected = false;
4137
4138                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
4139                         if (tcon->need_reconnect || tcon->need_reopen_files) {
4140                                 tcon->tc_count++;
4141                                 list_add_tail(&tcon->rlist, &tmp_list);
4142                                 tcon_selected = true;
4143                         }
4144                 }
4145                 /*
4146                  * IPC has the same lifetime as its session and uses its
4147                  * refcount.
4148                  */
4149                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
4150                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
4151                         tcon_selected = true;
4152                         cifs_smb_ses_inc_refcount(ses);
4153                 }
4154                 /*
4155                  * handle the case where channel needs to reconnect
4156                  * binding session, but tcon is healthy (some other channel
4157                  * is active)
4158                  */
4159                 spin_lock(&ses->chan_lock);
4160                 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
4161                         list_add_tail(&ses->rlist, &tmp_ses_list);
4162                         ses_exist = true;
4163                         cifs_smb_ses_inc_refcount(ses);
4164                 }
4165                 spin_unlock(&ses->chan_lock);
4166         }
4167         spin_unlock(&cifs_tcp_ses_lock);
4168
4169         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
4170                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4171                 if (!rc)
4172                         cifs_reopen_persistent_handles(tcon);
4173                 else
4174                         resched = true;
4175                 list_del_init(&tcon->rlist);
4176                 if (tcon->ipc)
4177                         cifs_put_smb_ses(tcon->ses);
4178                 else
4179                         cifs_put_tcon(tcon);
4180         }
4181
4182         if (!ses_exist)
4183                 goto done;
4184
4185         /* allocate a dummy tcon struct used for reconnect */
4186         tcon = tcon_info_alloc(false);
4187         if (!tcon) {
4188                 resched = true;
4189                 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4190                         list_del_init(&ses->rlist);
4191                         cifs_put_smb_ses(ses);
4192                 }
4193                 goto done;
4194         }
4195
4196         tcon->status = TID_GOOD;
4197         tcon->retry = false;
4198         tcon->need_reconnect = false;
4199
4200         /* now reconnect sessions for necessary channels */
4201         list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4202                 tcon->ses = ses;
4203                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4204                 if (rc)
4205                         resched = true;
4206                 list_del_init(&ses->rlist);
4207                 cifs_put_smb_ses(ses);
4208         }
4209         tconInfoFree(tcon);
4210
4211 done:
4212         cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
4213         if (resched)
4214                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
4215         mutex_unlock(&pserver->reconnect_mutex);
4216
4217         /* now we can safely release srv struct */
4218         cifs_put_tcp_session(server, true);
4219 }
4220
4221 int
4222 SMB2_echo(struct TCP_Server_Info *server)
4223 {
4224         struct smb2_echo_req *req;
4225         int rc = 0;
4226         struct kvec iov[1];
4227         struct smb_rqst rqst = { .rq_iov = iov,
4228                                  .rq_nvec = 1 };
4229         unsigned int total_len;
4230
4231         cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
4232
4233         spin_lock(&server->srv_lock);
4234         if (server->ops->need_neg &&
4235             server->ops->need_neg(server)) {
4236                 spin_unlock(&server->srv_lock);
4237                 /* No need to send echo on newly established connections */
4238                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
4239                 return rc;
4240         }
4241         spin_unlock(&server->srv_lock);
4242
4243         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
4244                                  (void **)&req, &total_len);
4245         if (rc)
4246                 return rc;
4247
4248         req->hdr.CreditRequest = cpu_to_le16(1);
4249
4250         iov[0].iov_len = total_len;
4251         iov[0].iov_base = (char *)req;
4252
4253         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
4254                              server, CIFS_ECHO_OP, NULL);
4255         if (rc)
4256                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
4257
4258         cifs_small_buf_release(req);
4259         return rc;
4260 }
4261
4262 void
4263 SMB2_flush_free(struct smb_rqst *rqst)
4264 {
4265         if (rqst && rqst->rq_iov)
4266                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4267 }
4268
4269 int
4270 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
4271                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4272                 u64 persistent_fid, u64 volatile_fid)
4273 {
4274         struct smb2_flush_req *req;
4275         struct kvec *iov = rqst->rq_iov;
4276         unsigned int total_len;
4277         int rc;
4278
4279         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
4280                                  (void **) &req, &total_len);
4281         if (rc)
4282                 return rc;
4283
4284         req->PersistentFileId = persistent_fid;
4285         req->VolatileFileId = volatile_fid;
4286
4287         iov[0].iov_base = (char *)req;
4288         iov[0].iov_len = total_len;
4289
4290         return 0;
4291 }
4292
4293 int
4294 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4295            u64 volatile_fid)
4296 {
4297         struct cifs_ses *ses = tcon->ses;
4298         struct smb_rqst rqst;
4299         struct kvec iov[1];
4300         struct kvec rsp_iov = {NULL, 0};
4301         struct TCP_Server_Info *server;
4302         int resp_buftype = CIFS_NO_BUFFER;
4303         int flags = 0;
4304         int rc = 0;
4305         int retries = 0, cur_sleep = 1;
4306
4307 replay_again:
4308         /* reinitialize for possible replay */
4309         flags = 0;
4310         server = cifs_pick_channel(ses);
4311
4312         cifs_dbg(FYI, "flush\n");
4313         if (!ses || !(ses->server))
4314                 return -EIO;
4315
4316         if (smb3_encryption_required(tcon))
4317                 flags |= CIFS_TRANSFORM_REQ;
4318
4319         memset(&rqst, 0, sizeof(struct smb_rqst));
4320         memset(&iov, 0, sizeof(iov));
4321         rqst.rq_iov = iov;
4322         rqst.rq_nvec = 1;
4323
4324         rc = SMB2_flush_init(xid, &rqst, tcon, server,
4325                              persistent_fid, volatile_fid);
4326         if (rc)
4327                 goto flush_exit;
4328
4329         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4330
4331         if (retries)
4332                 smb2_set_replay(server, &rqst);
4333
4334         rc = cifs_send_recv(xid, ses, server,
4335                             &rqst, &resp_buftype, flags, &rsp_iov);
4336
4337         if (rc != 0) {
4338                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4339                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4340                                      rc);
4341         } else
4342                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4343                                       ses->Suid);
4344
4345  flush_exit:
4346         SMB2_flush_free(&rqst);
4347         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4348
4349         if (is_replayable_error(rc) &&
4350             smb2_should_replay(tcon, &retries, &cur_sleep))
4351                 goto replay_again;
4352
4353         return rc;
4354 }
4355
4356 #ifdef CONFIG_CIFS_SMB_DIRECT
4357 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
4358 {
4359         struct TCP_Server_Info *server = io_parms->server;
4360         struct cifs_tcon *tcon = io_parms->tcon;
4361
4362         /* we can only offload if we're connected */
4363         if (!server || !tcon)
4364                 return false;
4365
4366         /* we can only offload on an rdma connection */
4367         if (!server->rdma || !server->smbd_conn)
4368                 return false;
4369
4370         /* we don't support signed offload yet */
4371         if (server->sign)
4372                 return false;
4373
4374         /* we don't support encrypted offload yet */
4375         if (smb3_encryption_required(tcon))
4376                 return false;
4377
4378         /* offload also has its overhead, so only do it if desired */
4379         if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)
4380                 return false;
4381
4382         return true;
4383 }
4384 #endif /* CONFIG_CIFS_SMB_DIRECT */
4385
4386 /*
4387  * To form a chain of read requests, any read requests after the first should
4388  * have the end_of_chain boolean set to true.
4389  */
4390 static int
4391 smb2_new_read_req(void **buf, unsigned int *total_len,
4392         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
4393         unsigned int remaining_bytes, int request_type)
4394 {
4395         int rc = -EACCES;
4396         struct smb2_read_req *req = NULL;
4397         struct smb2_hdr *shdr;
4398         struct TCP_Server_Info *server = io_parms->server;
4399
4400         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4401                                  (void **) &req, total_len);
4402         if (rc)
4403                 return rc;
4404
4405         if (server == NULL)
4406                 return -ECONNABORTED;
4407
4408         shdr = &req->hdr;
4409         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4410
4411         req->PersistentFileId = io_parms->persistent_fid;
4412         req->VolatileFileId = io_parms->volatile_fid;
4413         req->ReadChannelInfoOffset = 0; /* reserved */
4414         req->ReadChannelInfoLength = 0; /* reserved */
4415         req->Channel = 0; /* reserved */
4416         req->MinimumCount = 0;
4417         req->Length = cpu_to_le32(io_parms->length);
4418         req->Offset = cpu_to_le64(io_parms->offset);
4419
4420         trace_smb3_read_enter(0 /* xid */,
4421                         io_parms->persistent_fid,
4422                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4423                         io_parms->offset, io_parms->length);
4424 #ifdef CONFIG_CIFS_SMB_DIRECT
4425         /*
4426          * If we want to do a RDMA write, fill in and append
4427          * smbd_buffer_descriptor_v1 to the end of read request
4428          */
4429         if (smb3_use_rdma_offload(io_parms)) {
4430                 struct smbd_buffer_descriptor_v1 *v1;
4431                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4432
4433                 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->iter,
4434                                              true, need_invalidate);
4435                 if (!rdata->mr)
4436                         return -EAGAIN;
4437
4438                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4439                 if (need_invalidate)
4440                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4441                 req->ReadChannelInfoOffset =
4442                         cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4443                 req->ReadChannelInfoLength =
4444                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4445                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4446                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4447                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4448                 v1->length = cpu_to_le32(rdata->mr->mr->length);
4449
4450                 *total_len += sizeof(*v1) - 1;
4451         }
4452 #endif
4453         if (request_type & CHAINED_REQUEST) {
4454                 if (!(request_type & END_OF_CHAIN)) {
4455                         /* next 8-byte aligned request */
4456                         *total_len = ALIGN(*total_len, 8);
4457                         shdr->NextCommand = cpu_to_le32(*total_len);
4458                 } else /* END_OF_CHAIN */
4459                         shdr->NextCommand = 0;
4460                 if (request_type & RELATED_REQUEST) {
4461                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4462                         /*
4463                          * Related requests use info from previous read request
4464                          * in chain.
4465                          */
4466                         shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4467                         shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4468                         req->PersistentFileId = (u64)-1;
4469                         req->VolatileFileId = (u64)-1;
4470                 }
4471         }
4472         if (remaining_bytes > io_parms->length)
4473                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
4474         else
4475                 req->RemainingBytes = 0;
4476
4477         *buf = req;
4478         return rc;
4479 }
4480
4481 static void
4482 smb2_readv_callback(struct mid_q_entry *mid)
4483 {
4484         struct cifs_readdata *rdata = mid->callback_data;
4485         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4486         struct TCP_Server_Info *server = rdata->server;
4487         struct smb2_hdr *shdr =
4488                                 (struct smb2_hdr *)rdata->iov[0].iov_base;
4489         struct cifs_credits credits = { .value = 0, .instance = 0 };
4490         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
4491
4492         if (rdata->got_bytes) {
4493                 rqst.rq_iter      = rdata->iter;
4494                 rqst.rq_iter_size = iov_iter_count(&rdata->iter);
4495         }
4496
4497         WARN_ONCE(rdata->server != mid->server,
4498                   "rdata server %p != mid server %p",
4499                   rdata->server, mid->server);
4500
4501         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
4502                  __func__, mid->mid, mid->mid_state, rdata->result,
4503                  rdata->bytes);
4504
4505         switch (mid->mid_state) {
4506         case MID_RESPONSE_RECEIVED:
4507                 credits.value = le16_to_cpu(shdr->CreditRequest);
4508                 credits.instance = server->reconnect_instance;
4509                 /* result already set, check signature */
4510                 if (server->sign && !mid->decrypted) {
4511                         int rc;
4512
4513                         iov_iter_revert(&rqst.rq_iter, rdata->got_bytes);
4514                         iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
4515                         rc = smb2_verify_signature(&rqst, server);
4516                         if (rc)
4517                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4518                                          rc);
4519                 }
4520                 /* FIXME: should this be counted toward the initiating task? */
4521                 task_io_account_read(rdata->got_bytes);
4522                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4523                 break;
4524         case MID_REQUEST_SUBMITTED:
4525         case MID_RETRY_NEEDED:
4526                 rdata->result = -EAGAIN;
4527                 if (server->sign && rdata->got_bytes)
4528                         /* reset bytes number since we can not check a sign */
4529                         rdata->got_bytes = 0;
4530                 /* FIXME: should this be counted toward the initiating task? */
4531                 task_io_account_read(rdata->got_bytes);
4532                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4533                 break;
4534         case MID_RESPONSE_MALFORMED:
4535                 credits.value = le16_to_cpu(shdr->CreditRequest);
4536                 credits.instance = server->reconnect_instance;
4537                 fallthrough;
4538         default:
4539                 rdata->result = -EIO;
4540         }
4541 #ifdef CONFIG_CIFS_SMB_DIRECT
4542         /*
4543          * If this rdata has a memmory registered, the MR can be freed
4544          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4545          * because they have limited number and are used for future I/Os
4546          */
4547         if (rdata->mr) {
4548                 smbd_deregister_mr(rdata->mr);
4549                 rdata->mr = NULL;
4550         }
4551 #endif
4552         if (rdata->result && rdata->result != -ENODATA) {
4553                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4554                 trace_smb3_read_err(0 /* xid */,
4555                                     rdata->cfile->fid.persistent_fid,
4556                                     tcon->tid, tcon->ses->Suid, rdata->offset,
4557                                     rdata->bytes, rdata->result);
4558         } else
4559                 trace_smb3_read_done(0 /* xid */,
4560                                      rdata->cfile->fid.persistent_fid,
4561                                      tcon->tid, tcon->ses->Suid,
4562                                      rdata->offset, rdata->got_bytes);
4563
4564         queue_work(cifsiod_wq, &rdata->work);
4565         release_mid(mid);
4566         add_credits(server, &credits, 0);
4567 }
4568
4569 /* smb2_async_readv - send an async read, and set up mid to handle result */
4570 int
4571 smb2_async_readv(struct cifs_readdata *rdata)
4572 {
4573         int rc, flags = 0;
4574         char *buf;
4575         struct smb2_hdr *shdr;
4576         struct cifs_io_parms io_parms;
4577         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4578                                  .rq_nvec = 1 };
4579         struct TCP_Server_Info *server;
4580         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4581         unsigned int total_len;
4582         int credit_request;
4583
4584         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4585                  __func__, rdata->offset, rdata->bytes);
4586
4587         if (!rdata->server)
4588                 rdata->server = cifs_pick_channel(tcon->ses);
4589
4590         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4591         io_parms.server = server = rdata->server;
4592         io_parms.offset = rdata->offset;
4593         io_parms.length = rdata->bytes;
4594         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4595         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4596         io_parms.pid = rdata->pid;
4597
4598         rc = smb2_new_read_req(
4599                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4600         if (rc)
4601                 return rc;
4602
4603         if (smb3_encryption_required(io_parms.tcon))
4604                 flags |= CIFS_TRANSFORM_REQ;
4605
4606         rdata->iov[0].iov_base = buf;
4607         rdata->iov[0].iov_len = total_len;
4608
4609         shdr = (struct smb2_hdr *)buf;
4610
4611         if (rdata->credits.value > 0) {
4612                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4613                                                 SMB2_MAX_BUFFER_SIZE));
4614                 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4615                 if (server->credits >= server->max_credits)
4616                         shdr->CreditRequest = cpu_to_le16(0);
4617                 else
4618                         shdr->CreditRequest = cpu_to_le16(
4619                                 min_t(int, server->max_credits -
4620                                                 server->credits, credit_request));
4621
4622                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4623                 if (rc)
4624                         goto async_readv_out;
4625
4626                 flags |= CIFS_HAS_CREDITS;
4627         }
4628
4629         kref_get(&rdata->refcount);
4630         rc = cifs_call_async(server, &rqst,
4631                              cifs_readv_receive, smb2_readv_callback,
4632                              smb3_handle_read_data, rdata, flags,
4633                              &rdata->credits);
4634         if (rc) {
4635                 kref_put(&rdata->refcount, cifs_readdata_release);
4636                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4637                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4638                                     io_parms.tcon->tid,
4639                                     io_parms.tcon->ses->Suid,
4640                                     io_parms.offset, io_parms.length, rc);
4641         }
4642
4643 async_readv_out:
4644         cifs_small_buf_release(buf);
4645         return rc;
4646 }
4647
4648 int
4649 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4650           unsigned int *nbytes, char **buf, int *buf_type)
4651 {
4652         struct smb_rqst rqst;
4653         int resp_buftype, rc;
4654         struct smb2_read_req *req = NULL;
4655         struct smb2_read_rsp *rsp = NULL;
4656         struct kvec iov[1];
4657         struct kvec rsp_iov;
4658         unsigned int total_len;
4659         int flags = CIFS_LOG_ERROR;
4660         struct cifs_ses *ses = io_parms->tcon->ses;
4661
4662         if (!io_parms->server)
4663                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4664
4665         *nbytes = 0;
4666         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4667         if (rc)
4668                 return rc;
4669
4670         if (smb3_encryption_required(io_parms->tcon))
4671                 flags |= CIFS_TRANSFORM_REQ;
4672
4673         iov[0].iov_base = (char *)req;
4674         iov[0].iov_len = total_len;
4675
4676         memset(&rqst, 0, sizeof(struct smb_rqst));
4677         rqst.rq_iov = iov;
4678         rqst.rq_nvec = 1;
4679
4680         rc = cifs_send_recv(xid, ses, io_parms->server,
4681                             &rqst, &resp_buftype, flags, &rsp_iov);
4682         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4683
4684         if (rc) {
4685                 if (rc != -ENODATA) {
4686                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4687                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4688                         trace_smb3_read_err(xid,
4689                                             req->PersistentFileId,
4690                                             io_parms->tcon->tid, ses->Suid,
4691                                             io_parms->offset, io_parms->length,
4692                                             rc);
4693                 } else
4694                         trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid,
4695                                              ses->Suid, io_parms->offset, 0);
4696                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4697                 cifs_small_buf_release(req);
4698                 return rc == -ENODATA ? 0 : rc;
4699         } else
4700                 trace_smb3_read_done(xid,
4701                                     req->PersistentFileId,
4702                                     io_parms->tcon->tid, ses->Suid,
4703                                     io_parms->offset, io_parms->length);
4704
4705         cifs_small_buf_release(req);
4706
4707         *nbytes = le32_to_cpu(rsp->DataLength);
4708         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4709             (*nbytes > io_parms->length)) {
4710                 cifs_dbg(FYI, "bad length %d for count %d\n",
4711                          *nbytes, io_parms->length);
4712                 rc = -EIO;
4713                 *nbytes = 0;
4714         }
4715
4716         if (*buf) {
4717                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4718                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4719         } else if (resp_buftype != CIFS_NO_BUFFER) {
4720                 *buf = rsp_iov.iov_base;
4721                 if (resp_buftype == CIFS_SMALL_BUFFER)
4722                         *buf_type = CIFS_SMALL_BUFFER;
4723                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4724                         *buf_type = CIFS_LARGE_BUFFER;
4725         }
4726         return rc;
4727 }
4728
4729 /*
4730  * Check the mid_state and signature on received buffer (if any), and queue the
4731  * workqueue completion task.
4732  */
4733 static void
4734 smb2_writev_callback(struct mid_q_entry *mid)
4735 {
4736         struct cifs_writedata *wdata = mid->callback_data;
4737         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4738         struct TCP_Server_Info *server = wdata->server;
4739         unsigned int written;
4740         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4741         struct cifs_credits credits = { .value = 0, .instance = 0 };
4742
4743         WARN_ONCE(wdata->server != mid->server,
4744                   "wdata server %p != mid server %p",
4745                   wdata->server, mid->server);
4746
4747         switch (mid->mid_state) {
4748         case MID_RESPONSE_RECEIVED:
4749                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4750                 credits.instance = server->reconnect_instance;
4751                 wdata->result = smb2_check_receive(mid, server, 0);
4752                 if (wdata->result != 0)
4753                         break;
4754
4755                 written = le32_to_cpu(rsp->DataLength);
4756                 /*
4757                  * Mask off high 16 bits when bytes written as returned
4758                  * by the server is greater than bytes requested by the
4759                  * client. OS/2 servers are known to set incorrect
4760                  * CountHigh values.
4761                  */
4762                 if (written > wdata->bytes)
4763                         written &= 0xFFFF;
4764
4765                 if (written < wdata->bytes)
4766                         wdata->result = -ENOSPC;
4767                 else
4768                         wdata->bytes = written;
4769                 break;
4770         case MID_REQUEST_SUBMITTED:
4771         case MID_RETRY_NEEDED:
4772                 wdata->result = -EAGAIN;
4773                 break;
4774         case MID_RESPONSE_MALFORMED:
4775                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4776                 credits.instance = server->reconnect_instance;
4777                 fallthrough;
4778         default:
4779                 wdata->result = -EIO;
4780                 break;
4781         }
4782 #ifdef CONFIG_CIFS_SMB_DIRECT
4783         /*
4784          * If this wdata has a memory registered, the MR can be freed
4785          * The number of MRs available is limited, it's important to recover
4786          * used MR as soon as I/O is finished. Hold MR longer in the later
4787          * I/O process can possibly result in I/O deadlock due to lack of MR
4788          * to send request on I/O retry
4789          */
4790         if (wdata->mr) {
4791                 smbd_deregister_mr(wdata->mr);
4792                 wdata->mr = NULL;
4793         }
4794 #endif
4795         if (wdata->result) {
4796                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4797                 trace_smb3_write_err(0 /* no xid */,
4798                                      wdata->cfile->fid.persistent_fid,
4799                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4800                                      wdata->bytes, wdata->result);
4801                 if (wdata->result == -ENOSPC)
4802                         pr_warn_once("Out of space writing to %s\n",
4803                                      tcon->tree_name);
4804         } else
4805                 trace_smb3_write_done(0 /* no xid */,
4806                                       wdata->cfile->fid.persistent_fid,
4807                                       tcon->tid, tcon->ses->Suid,
4808                                       wdata->offset, wdata->bytes);
4809
4810         queue_work(cifsiod_wq, &wdata->work);
4811         release_mid(mid);
4812         add_credits(server, &credits, 0);
4813 }
4814
4815 /* smb2_async_writev - send an async write, and set up mid to handle result */
4816 int
4817 smb2_async_writev(struct cifs_writedata *wdata,
4818                   void (*release)(struct kref *kref))
4819 {
4820         int rc = -EACCES, flags = 0;
4821         struct smb2_write_req *req = NULL;
4822         struct smb2_hdr *shdr;
4823         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4824         struct TCP_Server_Info *server = wdata->server;
4825         struct kvec iov[1];
4826         struct smb_rqst rqst = { };
4827         unsigned int total_len;
4828         struct cifs_io_parms _io_parms;
4829         struct cifs_io_parms *io_parms = NULL;
4830         int credit_request;
4831
4832         if (!wdata->server || wdata->replay)
4833                 server = wdata->server = cifs_pick_channel(tcon->ses);
4834
4835         /*
4836          * in future we may get cifs_io_parms passed in from the caller,
4837          * but for now we construct it here...
4838          */
4839         _io_parms = (struct cifs_io_parms) {
4840                 .tcon = tcon,
4841                 .server = server,
4842                 .offset = wdata->offset,
4843                 .length = wdata->bytes,
4844                 .persistent_fid = wdata->cfile->fid.persistent_fid,
4845                 .volatile_fid = wdata->cfile->fid.volatile_fid,
4846                 .pid = wdata->pid,
4847         };
4848         io_parms = &_io_parms;
4849
4850         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4851                                  (void **) &req, &total_len);
4852         if (rc)
4853                 return rc;
4854
4855         if (smb3_encryption_required(tcon))
4856                 flags |= CIFS_TRANSFORM_REQ;
4857
4858         shdr = (struct smb2_hdr *)req;
4859         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4860
4861         req->PersistentFileId = io_parms->persistent_fid;
4862         req->VolatileFileId = io_parms->volatile_fid;
4863         req->WriteChannelInfoOffset = 0;
4864         req->WriteChannelInfoLength = 0;
4865         req->Channel = SMB2_CHANNEL_NONE;
4866         req->Offset = cpu_to_le64(io_parms->offset);
4867         req->DataOffset = cpu_to_le16(
4868                                 offsetof(struct smb2_write_req, Buffer));
4869         req->RemainingBytes = 0;
4870
4871         trace_smb3_write_enter(0 /* xid */,
4872                                io_parms->persistent_fid,
4873                                io_parms->tcon->tid,
4874                                io_parms->tcon->ses->Suid,
4875                                io_parms->offset,
4876                                io_parms->length);
4877
4878 #ifdef CONFIG_CIFS_SMB_DIRECT
4879         /*
4880          * If we want to do a server RDMA read, fill in and append
4881          * smbd_buffer_descriptor_v1 to the end of write request
4882          */
4883         if (smb3_use_rdma_offload(io_parms)) {
4884                 struct smbd_buffer_descriptor_v1 *v1;
4885                 size_t data_size = iov_iter_count(&wdata->iter);
4886                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4887
4888                 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->iter,
4889                                              false, need_invalidate);
4890                 if (!wdata->mr) {
4891                         rc = -EAGAIN;
4892                         goto async_writev_out;
4893                 }
4894                 req->Length = 0;
4895                 req->DataOffset = 0;
4896                 req->RemainingBytes = cpu_to_le32(data_size);
4897                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4898                 if (need_invalidate)
4899                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4900                 req->WriteChannelInfoOffset =
4901                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4902                 req->WriteChannelInfoLength =
4903                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4904                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4905                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4906                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4907                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4908         }
4909 #endif
4910         iov[0].iov_len = total_len - 1;
4911         iov[0].iov_base = (char *)req;
4912
4913         rqst.rq_iov = iov;
4914         rqst.rq_nvec = 1;
4915         rqst.rq_iter = wdata->iter;
4916         rqst.rq_iter_size = iov_iter_count(&rqst.rq_iter);
4917         if (wdata->replay)
4918                 smb2_set_replay(server, &rqst);
4919 #ifdef CONFIG_CIFS_SMB_DIRECT
4920         if (wdata->mr)
4921                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4922 #endif
4923         cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
4924                  io_parms->offset, io_parms->length, iov_iter_count(&rqst.rq_iter));
4925
4926 #ifdef CONFIG_CIFS_SMB_DIRECT
4927         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4928         if (!wdata->mr)
4929                 req->Length = cpu_to_le32(io_parms->length);
4930 #else
4931         req->Length = cpu_to_le32(io_parms->length);
4932 #endif
4933
4934         if (wdata->credits.value > 0) {
4935                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4936                                                     SMB2_MAX_BUFFER_SIZE));
4937                 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4938                 if (server->credits >= server->max_credits)
4939                         shdr->CreditRequest = cpu_to_le16(0);
4940                 else
4941                         shdr->CreditRequest = cpu_to_le16(
4942                                 min_t(int, server->max_credits -
4943                                                 server->credits, credit_request));
4944
4945                 rc = adjust_credits(server, &wdata->credits, io_parms->length);
4946                 if (rc)
4947                         goto async_writev_out;
4948
4949                 flags |= CIFS_HAS_CREDITS;
4950         }
4951
4952         kref_get(&wdata->refcount);
4953         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4954                              wdata, flags, &wdata->credits);
4955
4956         if (rc) {
4957                 trace_smb3_write_err(0 /* no xid */,
4958                                      io_parms->persistent_fid,
4959                                      io_parms->tcon->tid,
4960                                      io_parms->tcon->ses->Suid,
4961                                      io_parms->offset,
4962                                      io_parms->length,
4963                                      rc);
4964                 kref_put(&wdata->refcount, release);
4965                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4966         }
4967
4968 async_writev_out:
4969         cifs_small_buf_release(req);
4970         return rc;
4971 }
4972
4973 /*
4974  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4975  * The length field from io_parms must be at least 1 and indicates a number of
4976  * elements with data to write that begins with position 1 in iov array. All
4977  * data length is specified by count.
4978  */
4979 int
4980 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4981            unsigned int *nbytes, struct kvec *iov, int n_vec)
4982 {
4983         struct smb_rqst rqst;
4984         int rc = 0;
4985         struct smb2_write_req *req = NULL;
4986         struct smb2_write_rsp *rsp = NULL;
4987         int resp_buftype;
4988         struct kvec rsp_iov;
4989         int flags = 0;
4990         unsigned int total_len;
4991         struct TCP_Server_Info *server;
4992         int retries = 0, cur_sleep = 1;
4993
4994 replay_again:
4995         /* reinitialize for possible replay */
4996         flags = 0;
4997         *nbytes = 0;
4998         if (!io_parms->server)
4999                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
5000         server = io_parms->server;
5001         if (server == NULL)
5002                 return -ECONNABORTED;
5003
5004         if (n_vec < 1)
5005                 return rc;
5006
5007         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
5008                                  (void **) &req, &total_len);
5009         if (rc)
5010                 return rc;
5011
5012         if (smb3_encryption_required(io_parms->tcon))
5013                 flags |= CIFS_TRANSFORM_REQ;
5014
5015         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
5016
5017         req->PersistentFileId = io_parms->persistent_fid;
5018         req->VolatileFileId = io_parms->volatile_fid;
5019         req->WriteChannelInfoOffset = 0;
5020         req->WriteChannelInfoLength = 0;
5021         req->Channel = 0;
5022         req->Length = cpu_to_le32(io_parms->length);
5023         req->Offset = cpu_to_le64(io_parms->offset);
5024         req->DataOffset = cpu_to_le16(
5025                                 offsetof(struct smb2_write_req, Buffer));
5026         req->RemainingBytes = 0;
5027
5028         trace_smb3_write_enter(xid, io_parms->persistent_fid,
5029                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
5030                 io_parms->offset, io_parms->length);
5031
5032         iov[0].iov_base = (char *)req;
5033         /* 1 for Buffer */
5034         iov[0].iov_len = total_len - 1;
5035
5036         memset(&rqst, 0, sizeof(struct smb_rqst));
5037         rqst.rq_iov = iov;
5038         rqst.rq_nvec = n_vec + 1;
5039
5040         if (retries)
5041                 smb2_set_replay(server, &rqst);
5042
5043         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
5044                             &rqst,
5045                             &resp_buftype, flags, &rsp_iov);
5046         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
5047
5048         if (rc) {
5049                 trace_smb3_write_err(xid,
5050                                      req->PersistentFileId,
5051                                      io_parms->tcon->tid,
5052                                      io_parms->tcon->ses->Suid,
5053                                      io_parms->offset, io_parms->length, rc);
5054                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
5055                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
5056         } else {
5057                 *nbytes = le32_to_cpu(rsp->DataLength);
5058                 trace_smb3_write_done(xid,
5059                                       req->PersistentFileId,
5060                                       io_parms->tcon->tid,
5061                                       io_parms->tcon->ses->Suid,
5062                                       io_parms->offset, *nbytes);
5063         }
5064
5065         cifs_small_buf_release(req);
5066         free_rsp_buf(resp_buftype, rsp);
5067
5068         if (is_replayable_error(rc) &&
5069             smb2_should_replay(io_parms->tcon, &retries, &cur_sleep))
5070                 goto replay_again;
5071
5072         return rc;
5073 }
5074
5075 int posix_info_sid_size(const void *beg, const void *end)
5076 {
5077         size_t subauth;
5078         int total;
5079
5080         if (beg + 1 > end)
5081                 return -1;
5082
5083         subauth = *(u8 *)(beg+1);
5084         if (subauth < 1 || subauth > 15)
5085                 return -1;
5086
5087         total = 1 + 1 + 6 + 4*subauth;
5088         if (beg + total > end)
5089                 return -1;
5090
5091         return total;
5092 }
5093
5094 int posix_info_parse(const void *beg, const void *end,
5095                      struct smb2_posix_info_parsed *out)
5096
5097 {
5098         int total_len = 0;
5099         int owner_len, group_len;
5100         int name_len;
5101         const void *owner_sid;
5102         const void *group_sid;
5103         const void *name;
5104
5105         /* if no end bound given, assume payload to be correct */
5106         if (!end) {
5107                 const struct smb2_posix_info *p = beg;
5108
5109                 end = beg + le32_to_cpu(p->NextEntryOffset);
5110                 /* last element will have a 0 offset, pick a sensible bound */
5111                 if (end == beg)
5112                         end += 0xFFFF;
5113         }
5114
5115         /* check base buf */
5116         if (beg + sizeof(struct smb2_posix_info) > end)
5117                 return -1;
5118         total_len = sizeof(struct smb2_posix_info);
5119
5120         /* check owner sid */
5121         owner_sid = beg + total_len;
5122         owner_len = posix_info_sid_size(owner_sid, end);
5123         if (owner_len < 0)
5124                 return -1;
5125         total_len += owner_len;
5126
5127         /* check group sid */
5128         group_sid = beg + total_len;
5129         group_len = posix_info_sid_size(group_sid, end);
5130         if (group_len < 0)
5131                 return -1;
5132         total_len += group_len;
5133
5134         /* check name len */
5135         if (beg + total_len + 4 > end)
5136                 return -1;
5137         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
5138         if (name_len < 1 || name_len > 0xFFFF)
5139                 return -1;
5140         total_len += 4;
5141
5142         /* check name */
5143         name = beg + total_len;
5144         if (name + name_len > end)
5145                 return -1;
5146         total_len += name_len;
5147
5148         if (out) {
5149                 out->base = beg;
5150                 out->size = total_len;
5151                 out->name_len = name_len;
5152                 out->name = name;
5153                 memcpy(&out->owner, owner_sid, owner_len);
5154                 memcpy(&out->group, group_sid, group_len);
5155         }
5156         return total_len;
5157 }
5158
5159 static int posix_info_extra_size(const void *beg, const void *end)
5160 {
5161         int len = posix_info_parse(beg, end, NULL);
5162
5163         if (len < 0)
5164                 return -1;
5165         return len - sizeof(struct smb2_posix_info);
5166 }
5167
5168 static unsigned int
5169 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
5170             size_t size)
5171 {
5172         int len;
5173         unsigned int entrycount = 0;
5174         unsigned int next_offset = 0;
5175         char *entryptr;
5176         FILE_DIRECTORY_INFO *dir_info;
5177
5178         if (bufstart == NULL)
5179                 return 0;
5180
5181         entryptr = bufstart;
5182
5183         while (1) {
5184                 if (entryptr + next_offset < entryptr ||
5185                     entryptr + next_offset > end_of_buf ||
5186                     entryptr + next_offset + size > end_of_buf) {
5187                         cifs_dbg(VFS, "malformed search entry would overflow\n");
5188                         break;
5189                 }
5190
5191                 entryptr = entryptr + next_offset;
5192                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
5193
5194                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
5195                         len = posix_info_extra_size(entryptr, end_of_buf);
5196                 else
5197                         len = le32_to_cpu(dir_info->FileNameLength);
5198
5199                 if (len < 0 ||
5200                     entryptr + len < entryptr ||
5201                     entryptr + len > end_of_buf ||
5202                     entryptr + len + size > end_of_buf) {
5203                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
5204                                  end_of_buf);
5205                         break;
5206                 }
5207
5208                 *lastentry = entryptr;
5209                 entrycount++;
5210
5211                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
5212                 if (!next_offset)
5213                         break;
5214         }
5215
5216         return entrycount;
5217 }
5218
5219 /*
5220  * Readdir/FindFirst
5221  */
5222 int SMB2_query_directory_init(const unsigned int xid,
5223                               struct cifs_tcon *tcon,
5224                               struct TCP_Server_Info *server,
5225                               struct smb_rqst *rqst,
5226                               u64 persistent_fid, u64 volatile_fid,
5227                               int index, int info_level)
5228 {
5229         struct smb2_query_directory_req *req;
5230         unsigned char *bufptr;
5231         __le16 asteriks = cpu_to_le16('*');
5232         unsigned int output_size = CIFSMaxBufSize -
5233                 MAX_SMB2_CREATE_RESPONSE_SIZE -
5234                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
5235         unsigned int total_len;
5236         struct kvec *iov = rqst->rq_iov;
5237         int len, rc;
5238
5239         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
5240                                  (void **) &req, &total_len);
5241         if (rc)
5242                 return rc;
5243
5244         switch (info_level) {
5245         case SMB_FIND_FILE_DIRECTORY_INFO:
5246                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
5247                 break;
5248         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5249                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
5250                 break;
5251         case SMB_FIND_FILE_POSIX_INFO:
5252                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
5253                 break;
5254         case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5255                 req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION;
5256                 break;
5257         default:
5258                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5259                         info_level);
5260                 return -EINVAL;
5261         }
5262
5263         req->FileIndex = cpu_to_le32(index);
5264         req->PersistentFileId = persistent_fid;
5265         req->VolatileFileId = volatile_fid;
5266
5267         len = 0x2;
5268         bufptr = req->Buffer;
5269         memcpy(bufptr, &asteriks, len);
5270
5271         req->FileNameOffset =
5272                 cpu_to_le16(sizeof(struct smb2_query_directory_req));
5273         req->FileNameLength = cpu_to_le16(len);
5274         /*
5275          * BB could be 30 bytes or so longer if we used SMB2 specific
5276          * buffer lengths, but this is safe and close enough.
5277          */
5278         output_size = min_t(unsigned int, output_size, server->maxBuf);
5279         output_size = min_t(unsigned int, output_size, 2 << 15);
5280         req->OutputBufferLength = cpu_to_le32(output_size);
5281
5282         iov[0].iov_base = (char *)req;
5283         /* 1 for Buffer */
5284         iov[0].iov_len = total_len - 1;
5285
5286         iov[1].iov_base = (char *)(req->Buffer);
5287         iov[1].iov_len = len;
5288
5289         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
5290                         tcon->ses->Suid, index, output_size);
5291
5292         return 0;
5293 }
5294
5295 void SMB2_query_directory_free(struct smb_rqst *rqst)
5296 {
5297         if (rqst && rqst->rq_iov) {
5298                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
5299         }
5300 }
5301
5302 int
5303 smb2_parse_query_directory(struct cifs_tcon *tcon,
5304                            struct kvec *rsp_iov,
5305                            int resp_buftype,
5306                            struct cifs_search_info *srch_inf)
5307 {
5308         struct smb2_query_directory_rsp *rsp;
5309         size_t info_buf_size;
5310         char *end_of_smb;
5311         int rc;
5312
5313         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
5314
5315         switch (srch_inf->info_level) {
5316         case SMB_FIND_FILE_DIRECTORY_INFO:
5317                 info_buf_size = sizeof(FILE_DIRECTORY_INFO);
5318                 break;
5319         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5320                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
5321                 break;
5322         case SMB_FIND_FILE_POSIX_INFO:
5323                 /* note that posix payload are variable size */
5324                 info_buf_size = sizeof(struct smb2_posix_info);
5325                 break;
5326         case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5327                 info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO);
5328                 break;
5329         default:
5330                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5331                          srch_inf->info_level);
5332                 return -EINVAL;
5333         }
5334
5335         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5336                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
5337                                info_buf_size);
5338         if (rc) {
5339                 cifs_tcon_dbg(VFS, "bad info payload");
5340                 return rc;
5341         }
5342
5343         srch_inf->unicode = true;
5344
5345         if (srch_inf->ntwrk_buf_start) {
5346                 if (srch_inf->smallBuf)
5347                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
5348                 else
5349                         cifs_buf_release(srch_inf->ntwrk_buf_start);
5350         }
5351         srch_inf->ntwrk_buf_start = (char *)rsp;
5352         srch_inf->srch_entries_start = srch_inf->last_entry =
5353                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
5354         end_of_smb = rsp_iov->iov_len + (char *)rsp;
5355
5356         srch_inf->entries_in_buffer = num_entries(
5357                 srch_inf->info_level,
5358                 srch_inf->srch_entries_start,
5359                 end_of_smb,
5360                 &srch_inf->last_entry,
5361                 info_buf_size);
5362
5363         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
5364         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
5365                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
5366                  srch_inf->srch_entries_start, srch_inf->last_entry);
5367         if (resp_buftype == CIFS_LARGE_BUFFER)
5368                 srch_inf->smallBuf = false;
5369         else if (resp_buftype == CIFS_SMALL_BUFFER)
5370                 srch_inf->smallBuf = true;
5371         else
5372                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
5373
5374         return 0;
5375 }
5376
5377 int
5378 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5379                      u64 persistent_fid, u64 volatile_fid, int index,
5380                      struct cifs_search_info *srch_inf)
5381 {
5382         struct smb_rqst rqst;
5383         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5384         struct smb2_query_directory_rsp *rsp = NULL;
5385         int resp_buftype = CIFS_NO_BUFFER;
5386         struct kvec rsp_iov;
5387         int rc = 0;
5388         struct cifs_ses *ses = tcon->ses;
5389         struct TCP_Server_Info *server;
5390         int flags = 0;
5391         int retries = 0, cur_sleep = 1;
5392
5393 replay_again:
5394         /* reinitialize for possible replay */
5395         flags = 0;
5396         server = cifs_pick_channel(ses);
5397
5398         if (!ses || !(ses->server))
5399                 return -EIO;
5400
5401         if (smb3_encryption_required(tcon))
5402                 flags |= CIFS_TRANSFORM_REQ;
5403
5404         memset(&rqst, 0, sizeof(struct smb_rqst));
5405         memset(&iov, 0, sizeof(iov));
5406         rqst.rq_iov = iov;
5407         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5408
5409         rc = SMB2_query_directory_init(xid, tcon, server,
5410                                        &rqst, persistent_fid,
5411                                        volatile_fid, index,
5412                                        srch_inf->info_level);
5413         if (rc)
5414                 goto qdir_exit;
5415
5416         if (retries)
5417                 smb2_set_replay(server, &rqst);
5418
5419         rc = cifs_send_recv(xid, ses, server,
5420                             &rqst, &resp_buftype, flags, &rsp_iov);
5421         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5422
5423         if (rc) {
5424                 if (rc == -ENODATA &&
5425                     rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5426                         trace_smb3_query_dir_done(xid, persistent_fid,
5427                                 tcon->tid, tcon->ses->Suid, index, 0);
5428                         srch_inf->endOfSearch = true;
5429                         rc = 0;
5430                 } else {
5431                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5432                                 tcon->ses->Suid, index, 0, rc);
5433                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5434                 }
5435                 goto qdir_exit;
5436         }
5437
5438         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
5439                                         srch_inf);
5440         if (rc) {
5441                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5442                         tcon->ses->Suid, index, 0, rc);
5443                 goto qdir_exit;
5444         }
5445         resp_buftype = CIFS_NO_BUFFER;
5446
5447         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5448                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5449
5450 qdir_exit:
5451         SMB2_query_directory_free(&rqst);
5452         free_rsp_buf(resp_buftype, rsp);
5453
5454         if (is_replayable_error(rc) &&
5455             smb2_should_replay(tcon, &retries, &cur_sleep))
5456                 goto replay_again;
5457
5458         return rc;
5459 }
5460
5461 int
5462 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5463                    struct smb_rqst *rqst,
5464                    u64 persistent_fid, u64 volatile_fid, u32 pid,
5465                    u8 info_class, u8 info_type, u32 additional_info,
5466                    void **data, unsigned int *size)
5467 {
5468         struct smb2_set_info_req *req;
5469         struct kvec *iov = rqst->rq_iov;
5470         unsigned int i, total_len;
5471         int rc;
5472
5473         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5474                                  (void **) &req, &total_len);
5475         if (rc)
5476                 return rc;
5477
5478         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5479         req->InfoType = info_type;
5480         req->FileInfoClass = info_class;
5481         req->PersistentFileId = persistent_fid;
5482         req->VolatileFileId = volatile_fid;
5483         req->AdditionalInformation = cpu_to_le32(additional_info);
5484
5485         req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
5486         req->BufferLength = cpu_to_le32(*size);
5487
5488         memcpy(req->Buffer, *data, *size);
5489         total_len += *size;
5490
5491         iov[0].iov_base = (char *)req;
5492         /* 1 for Buffer */
5493         iov[0].iov_len = total_len - 1;
5494
5495         for (i = 1; i < rqst->rq_nvec; i++) {
5496                 le32_add_cpu(&req->BufferLength, size[i]);
5497                 iov[i].iov_base = (char *)data[i];
5498                 iov[i].iov_len = size[i];
5499         }
5500
5501         return 0;
5502 }
5503
5504 void
5505 SMB2_set_info_free(struct smb_rqst *rqst)
5506 {
5507         if (rqst && rqst->rq_iov)
5508                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5509 }
5510
5511 static int
5512 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5513                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5514                u8 info_type, u32 additional_info, unsigned int num,
5515                 void **data, unsigned int *size)
5516 {
5517         struct smb_rqst rqst;
5518         struct smb2_set_info_rsp *rsp = NULL;
5519         struct kvec *iov;
5520         struct kvec rsp_iov;
5521         int rc = 0;
5522         int resp_buftype;
5523         struct cifs_ses *ses = tcon->ses;
5524         struct TCP_Server_Info *server;
5525         int flags = 0;
5526         int retries = 0, cur_sleep = 1;
5527
5528 replay_again:
5529         /* reinitialize for possible replay */
5530         flags = 0;
5531         server = cifs_pick_channel(ses);
5532
5533         if (!ses || !server)
5534                 return -EIO;
5535
5536         if (!num)
5537                 return -EINVAL;
5538
5539         if (smb3_encryption_required(tcon))
5540                 flags |= CIFS_TRANSFORM_REQ;
5541
5542         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5543         if (!iov)
5544                 return -ENOMEM;
5545
5546         memset(&rqst, 0, sizeof(struct smb_rqst));
5547         rqst.rq_iov = iov;
5548         rqst.rq_nvec = num;
5549
5550         rc = SMB2_set_info_init(tcon, server,
5551                                 &rqst, persistent_fid, volatile_fid, pid,
5552                                 info_class, info_type, additional_info,
5553                                 data, size);
5554         if (rc) {
5555                 kfree(iov);
5556                 return rc;
5557         }
5558
5559         if (retries)
5560                 smb2_set_replay(server, &rqst);
5561
5562         rc = cifs_send_recv(xid, ses, server,
5563                             &rqst, &resp_buftype, flags,
5564                             &rsp_iov);
5565         SMB2_set_info_free(&rqst);
5566         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5567
5568         if (rc != 0) {
5569                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5570                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5571                                 ses->Suid, info_class, (__u32)info_type, rc);
5572         }
5573
5574         free_rsp_buf(resp_buftype, rsp);
5575         kfree(iov);
5576
5577         if (is_replayable_error(rc) &&
5578             smb2_should_replay(tcon, &retries, &cur_sleep))
5579                 goto replay_again;
5580
5581         return rc;
5582 }
5583
5584 int
5585 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5586              u64 volatile_fid, u32 pid, loff_t new_eof)
5587 {
5588         struct smb2_file_eof_info info;
5589         void *data;
5590         unsigned int size;
5591
5592         info.EndOfFile = cpu_to_le64(new_eof);
5593
5594         data = &info;
5595         size = sizeof(struct smb2_file_eof_info);
5596
5597         trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof);
5598
5599         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5600                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5601                         0, 1, &data, &size);
5602 }
5603
5604 int
5605 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5606                 u64 persistent_fid, u64 volatile_fid,
5607                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5608 {
5609         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5610                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5611                         1, (void **)&pnntsd, &pacllen);
5612 }
5613
5614 int
5615 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5616             u64 persistent_fid, u64 volatile_fid,
5617             struct smb2_file_full_ea_info *buf, int len)
5618 {
5619         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5620                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5621                 0, 1, (void **)&buf, &len);
5622 }
5623
5624 int
5625 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5626                   const u64 persistent_fid, const u64 volatile_fid,
5627                   __u8 oplock_level)
5628 {
5629         struct smb_rqst rqst;
5630         int rc;
5631         struct smb2_oplock_break *req = NULL;
5632         struct cifs_ses *ses = tcon->ses;
5633         struct TCP_Server_Info *server;
5634         int flags = CIFS_OBREAK_OP;
5635         unsigned int total_len;
5636         struct kvec iov[1];
5637         struct kvec rsp_iov;
5638         int resp_buf_type;
5639         int retries = 0, cur_sleep = 1;
5640
5641 replay_again:
5642         /* reinitialize for possible replay */
5643         flags = CIFS_OBREAK_OP;
5644         server = cifs_pick_channel(ses);
5645
5646         cifs_dbg(FYI, "SMB2_oplock_break\n");
5647         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5648                                  (void **) &req, &total_len);
5649         if (rc)
5650                 return rc;
5651
5652         if (smb3_encryption_required(tcon))
5653                 flags |= CIFS_TRANSFORM_REQ;
5654
5655         req->VolatileFid = volatile_fid;
5656         req->PersistentFid = persistent_fid;
5657         req->OplockLevel = oplock_level;
5658         req->hdr.CreditRequest = cpu_to_le16(1);
5659
5660         flags |= CIFS_NO_RSP_BUF;
5661
5662         iov[0].iov_base = (char *)req;
5663         iov[0].iov_len = total_len;
5664
5665         memset(&rqst, 0, sizeof(struct smb_rqst));
5666         rqst.rq_iov = iov;
5667         rqst.rq_nvec = 1;
5668
5669         if (retries)
5670                 smb2_set_replay(server, &rqst);
5671
5672         rc = cifs_send_recv(xid, ses, server,
5673                             &rqst, &resp_buf_type, flags, &rsp_iov);
5674         cifs_small_buf_release(req);
5675         if (rc) {
5676                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5677                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5678         }
5679
5680         if (is_replayable_error(rc) &&
5681             smb2_should_replay(tcon, &retries, &cur_sleep))
5682                 goto replay_again;
5683
5684         return rc;
5685 }
5686
5687 void
5688 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5689                              struct kstatfs *kst)
5690 {
5691         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5692                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5693         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5694         kst->f_bfree  = kst->f_bavail =
5695                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5696         return;
5697 }
5698
5699 static void
5700 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5701                         struct kstatfs *kst)
5702 {
5703         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5704         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5705         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5706         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5707                 kst->f_bavail = kst->f_bfree;
5708         else
5709                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5710         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5711                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5712         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5713                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5714
5715         return;
5716 }
5717
5718 static int
5719 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5720                    struct TCP_Server_Info *server,
5721                    int level, int outbuf_len, u64 persistent_fid,
5722                    u64 volatile_fid)
5723 {
5724         int rc;
5725         struct smb2_query_info_req *req;
5726         unsigned int total_len;
5727
5728         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5729
5730         if ((tcon->ses == NULL) || server == NULL)
5731                 return -EIO;
5732
5733         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5734                                  (void **) &req, &total_len);
5735         if (rc)
5736                 return rc;
5737
5738         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5739         req->FileInfoClass = level;
5740         req->PersistentFileId = persistent_fid;
5741         req->VolatileFileId = volatile_fid;
5742         /* 1 for pad */
5743         req->InputBufferOffset =
5744                         cpu_to_le16(sizeof(struct smb2_query_info_req));
5745         req->OutputBufferLength = cpu_to_le32(
5746                 outbuf_len + sizeof(struct smb2_query_info_rsp));
5747
5748         iov->iov_base = (char *)req;
5749         iov->iov_len = total_len;
5750         return 0;
5751 }
5752
5753 static inline void free_qfs_info_req(struct kvec *iov)
5754 {
5755         cifs_buf_release(iov->iov_base);
5756 }
5757
5758 int
5759 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5760               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5761 {
5762         struct smb_rqst rqst;
5763         struct smb2_query_info_rsp *rsp = NULL;
5764         struct kvec iov;
5765         struct kvec rsp_iov;
5766         int rc = 0;
5767         int resp_buftype;
5768         struct cifs_ses *ses = tcon->ses;
5769         struct TCP_Server_Info *server;
5770         FILE_SYSTEM_POSIX_INFO *info = NULL;
5771         int flags = 0;
5772         int retries = 0, cur_sleep = 1;
5773
5774 replay_again:
5775         /* reinitialize for possible replay */
5776         flags = 0;
5777         server = cifs_pick_channel(ses);
5778
5779         rc = build_qfs_info_req(&iov, tcon, server,
5780                                 FS_POSIX_INFORMATION,
5781                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5782                                 persistent_fid, volatile_fid);
5783         if (rc)
5784                 return rc;
5785
5786         if (smb3_encryption_required(tcon))
5787                 flags |= CIFS_TRANSFORM_REQ;
5788
5789         memset(&rqst, 0, sizeof(struct smb_rqst));
5790         rqst.rq_iov = &iov;
5791         rqst.rq_nvec = 1;
5792
5793         if (retries)
5794                 smb2_set_replay(server, &rqst);
5795
5796         rc = cifs_send_recv(xid, ses, server,
5797                             &rqst, &resp_buftype, flags, &rsp_iov);
5798         free_qfs_info_req(&iov);
5799         if (rc) {
5800                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5801                 goto posix_qfsinf_exit;
5802         }
5803         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5804
5805         info = (FILE_SYSTEM_POSIX_INFO *)(
5806                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5807         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5808                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5809                                sizeof(FILE_SYSTEM_POSIX_INFO));
5810         if (!rc)
5811                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5812
5813 posix_qfsinf_exit:
5814         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5815
5816         if (is_replayable_error(rc) &&
5817             smb2_should_replay(tcon, &retries, &cur_sleep))
5818                 goto replay_again;
5819
5820         return rc;
5821 }
5822
5823 int
5824 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5825               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5826 {
5827         struct smb_rqst rqst;
5828         struct smb2_query_info_rsp *rsp = NULL;
5829         struct kvec iov;
5830         struct kvec rsp_iov;
5831         int rc = 0;
5832         int resp_buftype;
5833         struct cifs_ses *ses = tcon->ses;
5834         struct TCP_Server_Info *server;
5835         struct smb2_fs_full_size_info *info = NULL;
5836         int flags = 0;
5837         int retries = 0, cur_sleep = 1;
5838
5839 replay_again:
5840         /* reinitialize for possible replay */
5841         flags = 0;
5842         server = cifs_pick_channel(ses);
5843
5844         rc = build_qfs_info_req(&iov, tcon, server,
5845                                 FS_FULL_SIZE_INFORMATION,
5846                                 sizeof(struct smb2_fs_full_size_info),
5847                                 persistent_fid, volatile_fid);
5848         if (rc)
5849                 return rc;
5850
5851         if (smb3_encryption_required(tcon))
5852                 flags |= CIFS_TRANSFORM_REQ;
5853
5854         memset(&rqst, 0, sizeof(struct smb_rqst));
5855         rqst.rq_iov = &iov;
5856         rqst.rq_nvec = 1;
5857
5858         if (retries)
5859                 smb2_set_replay(server, &rqst);
5860
5861         rc = cifs_send_recv(xid, ses, server,
5862                             &rqst, &resp_buftype, flags, &rsp_iov);
5863         free_qfs_info_req(&iov);
5864         if (rc) {
5865                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5866                 goto qfsinf_exit;
5867         }
5868         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5869
5870         info = (struct smb2_fs_full_size_info *)(
5871                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5872         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5873                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5874                                sizeof(struct smb2_fs_full_size_info));
5875         if (!rc)
5876                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5877
5878 qfsinf_exit:
5879         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5880
5881         if (is_replayable_error(rc) &&
5882             smb2_should_replay(tcon, &retries, &cur_sleep))
5883                 goto replay_again;
5884
5885         return rc;
5886 }
5887
5888 int
5889 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5890               u64 persistent_fid, u64 volatile_fid, int level)
5891 {
5892         struct smb_rqst rqst;
5893         struct smb2_query_info_rsp *rsp = NULL;
5894         struct kvec iov;
5895         struct kvec rsp_iov;
5896         int rc = 0;
5897         int resp_buftype, max_len, min_len;
5898         struct cifs_ses *ses = tcon->ses;
5899         struct TCP_Server_Info *server;
5900         unsigned int rsp_len, offset;
5901         int flags = 0;
5902         int retries = 0, cur_sleep = 1;
5903
5904 replay_again:
5905         /* reinitialize for possible replay */
5906         flags = 0;
5907         server = cifs_pick_channel(ses);
5908
5909         if (level == FS_DEVICE_INFORMATION) {
5910                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5911                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5912         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5913                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5914                 min_len = MIN_FS_ATTR_INFO_SIZE;
5915         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5916                 max_len = sizeof(struct smb3_fs_ss_info);
5917                 min_len = sizeof(struct smb3_fs_ss_info);
5918         } else if (level == FS_VOLUME_INFORMATION) {
5919                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5920                 min_len = sizeof(struct smb3_fs_vol_info);
5921         } else {
5922                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5923                 return -EINVAL;
5924         }
5925
5926         rc = build_qfs_info_req(&iov, tcon, server,
5927                                 level, max_len,
5928                                 persistent_fid, volatile_fid);
5929         if (rc)
5930                 return rc;
5931
5932         if (smb3_encryption_required(tcon))
5933                 flags |= CIFS_TRANSFORM_REQ;
5934
5935         memset(&rqst, 0, sizeof(struct smb_rqst));
5936         rqst.rq_iov = &iov;
5937         rqst.rq_nvec = 1;
5938
5939         if (retries)
5940                 smb2_set_replay(server, &rqst);
5941
5942         rc = cifs_send_recv(xid, ses, server,
5943                             &rqst, &resp_buftype, flags, &rsp_iov);
5944         free_qfs_info_req(&iov);
5945         if (rc) {
5946                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5947                 goto qfsattr_exit;
5948         }
5949         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5950
5951         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5952         offset = le16_to_cpu(rsp->OutputBufferOffset);
5953         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5954         if (rc)
5955                 goto qfsattr_exit;
5956
5957         if (level == FS_ATTRIBUTE_INFORMATION)
5958                 memcpy(&tcon->fsAttrInfo, offset
5959                         + (char *)rsp, min_t(unsigned int,
5960                         rsp_len, max_len));
5961         else if (level == FS_DEVICE_INFORMATION)
5962                 memcpy(&tcon->fsDevInfo, offset
5963                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5964         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5965                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5966                         (offset + (char *)rsp);
5967                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5968                 tcon->perf_sector_size =
5969                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5970         } else if (level == FS_VOLUME_INFORMATION) {
5971                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5972                         (offset + (char *)rsp);
5973                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5974                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5975         }
5976
5977 qfsattr_exit:
5978         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5979
5980         if (is_replayable_error(rc) &&
5981             smb2_should_replay(tcon, &retries, &cur_sleep))
5982                 goto replay_again;
5983
5984         return rc;
5985 }
5986
5987 int
5988 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5989            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5990            const __u32 num_lock, struct smb2_lock_element *buf)
5991 {
5992         struct smb_rqst rqst;
5993         int rc = 0;
5994         struct smb2_lock_req *req = NULL;
5995         struct kvec iov[2];
5996         struct kvec rsp_iov;
5997         int resp_buf_type;
5998         unsigned int count;
5999         int flags = CIFS_NO_RSP_BUF;
6000         unsigned int total_len;
6001         struct TCP_Server_Info *server;
6002         int retries = 0, cur_sleep = 1;
6003
6004 replay_again:
6005         /* reinitialize for possible replay */
6006         flags = CIFS_NO_RSP_BUF;
6007         server = cifs_pick_channel(tcon->ses);
6008
6009         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
6010
6011         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
6012                                  (void **) &req, &total_len);
6013         if (rc)
6014                 return rc;
6015
6016         if (smb3_encryption_required(tcon))
6017                 flags |= CIFS_TRANSFORM_REQ;
6018
6019         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
6020         req->LockCount = cpu_to_le16(num_lock);
6021
6022         req->PersistentFileId = persist_fid;
6023         req->VolatileFileId = volatile_fid;
6024
6025         count = num_lock * sizeof(struct smb2_lock_element);
6026
6027         iov[0].iov_base = (char *)req;
6028         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
6029         iov[1].iov_base = (char *)buf;
6030         iov[1].iov_len = count;
6031
6032         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
6033
6034         memset(&rqst, 0, sizeof(struct smb_rqst));
6035         rqst.rq_iov = iov;
6036         rqst.rq_nvec = 2;
6037
6038         if (retries)
6039                 smb2_set_replay(server, &rqst);
6040
6041         rc = cifs_send_recv(xid, tcon->ses, server,
6042                             &rqst, &resp_buf_type, flags,
6043                             &rsp_iov);
6044         cifs_small_buf_release(req);
6045         if (rc) {
6046                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
6047                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
6048                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
6049                                     tcon->ses->Suid, rc);
6050         }
6051
6052         if (is_replayable_error(rc) &&
6053             smb2_should_replay(tcon, &retries, &cur_sleep))
6054                 goto replay_again;
6055
6056         return rc;
6057 }
6058
6059 int
6060 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
6061           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6062           const __u64 length, const __u64 offset, const __u32 lock_flags,
6063           const bool wait)
6064 {
6065         struct smb2_lock_element lock;
6066
6067         lock.Offset = cpu_to_le64(offset);
6068         lock.Length = cpu_to_le64(length);
6069         lock.Flags = cpu_to_le32(lock_flags);
6070         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
6071                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
6072
6073         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
6074 }
6075
6076 int
6077 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
6078                  __u8 *lease_key, const __le32 lease_state)
6079 {
6080         struct smb_rqst rqst;
6081         int rc;
6082         struct smb2_lease_ack *req = NULL;
6083         struct cifs_ses *ses = tcon->ses;
6084         int flags = CIFS_OBREAK_OP;
6085         unsigned int total_len;
6086         struct kvec iov[1];
6087         struct kvec rsp_iov;
6088         int resp_buf_type;
6089         __u64 *please_key_high;
6090         __u64 *please_key_low;
6091         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
6092
6093         cifs_dbg(FYI, "SMB2_lease_break\n");
6094         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
6095                                  (void **) &req, &total_len);
6096         if (rc)
6097                 return rc;
6098
6099         if (smb3_encryption_required(tcon))
6100                 flags |= CIFS_TRANSFORM_REQ;
6101
6102         req->hdr.CreditRequest = cpu_to_le16(1);
6103         req->StructureSize = cpu_to_le16(36);
6104         total_len += 12;
6105
6106         memcpy(req->LeaseKey, lease_key, 16);
6107         req->LeaseState = lease_state;
6108
6109         flags |= CIFS_NO_RSP_BUF;
6110
6111         iov[0].iov_base = (char *)req;
6112         iov[0].iov_len = total_len;
6113
6114         memset(&rqst, 0, sizeof(struct smb_rqst));
6115         rqst.rq_iov = iov;
6116         rqst.rq_nvec = 1;
6117
6118         rc = cifs_send_recv(xid, ses, server,
6119                             &rqst, &resp_buf_type, flags, &rsp_iov);
6120         cifs_small_buf_release(req);
6121
6122         please_key_low = (__u64 *)lease_key;
6123         please_key_high = (__u64 *)(lease_key+8);
6124         if (rc) {
6125                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
6126                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
6127                         ses->Suid, *please_key_low, *please_key_high, rc);
6128                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
6129         } else
6130                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
6131                         ses->Suid, *please_key_low, *please_key_high);
6132
6133         return rc;
6134 }