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 ([email protected])
   7  *              Pavel Shilovsky ([email protected]) 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 <linux/netfs.h>
  27 #include <trace/events/netfs.h>
  28 #include "cifsglob.h"
  29 #include "cifsacl.h"
  30 #include "cifsproto.h"
  31 #include "smb2proto.h"
  32 #include "cifs_unicode.h"
  33 #include "cifs_debug.h"
  34 #include "ntlmssp.h"
  35 #include "../common/smb2status.h"
  36 #include "smb2glob.h"
  37 #include "cifspdu.h"
  38 #include "cifs_spnego.h"
  39 #include "smbdirect.h"
  40 #include "trace.h"
  41 #ifdef CONFIG_CIFS_DFS_UPCALL
  42 #include "dfs_cache.h"
  43 #endif
  44 #include "cached_dir.h"
  45 #include "compress.h"
  46
  47 /*
  48  *  The following table defines the expected "StructureSize" of SMB2 requests
  49  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  50  *
  51  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  52  *  indexed by command in host byte order.
  53  */
  54 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  55         /* SMB2_NEGOTIATE */ 36,
  56         /* SMB2_SESSION_SETUP */ 25,
  57         /* SMB2_LOGOFF */ 4,
  58         /* SMB2_TREE_CONNECT */ 9,
  59         /* SMB2_TREE_DISCONNECT */ 4,
  60         /* SMB2_CREATE */ 57,
  61         /* SMB2_CLOSE */ 24,
  62         /* SMB2_FLUSH */ 24,
  63         /* SMB2_READ */ 49,
  64         /* SMB2_WRITE */ 49,
  65         /* SMB2_LOCK */ 48,
  66         /* SMB2_IOCTL */ 57,
  67         /* SMB2_CANCEL */ 4,
  68         /* SMB2_ECHO */ 4,
  69         /* SMB2_QUERY_DIRECTORY */ 33,
  70         /* SMB2_CHANGE_NOTIFY */ 32,
  71         /* SMB2_QUERY_INFO */ 41,
  72         /* SMB2_SET_INFO */ 33,
  73         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  74 };
  75
  76 int smb3_encryption_required(const struct cifs_tcon *tcon)
  77 {
  78         if (!tcon || !tcon->ses)
  79                 return 0;
  80         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  81             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  82                 return 1;
  83         if (tcon->seal &&
  84             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  85                 return 1;
  86         if (((global_secflags & CIFSSEC_MUST_SEAL) == CIFSSEC_MUST_SEAL) &&
  87             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  88                 return 1;
  89         return 0;
  90 }
  91
  92 static void
  93 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
  94                   const struct cifs_tcon *tcon,
  95                   struct TCP_Server_Info *server)
  96 {
  97         struct smb3_hdr_req *smb3_hdr;
  98
  99         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 100         shdr->StructureSize = cpu_to_le16(64);
 101         shdr->Command = smb2_cmd;
 102
 103         if (server) {
 104                 /* After reconnect SMB3 must set ChannelSequence on subsequent reqs */
 105                 if (server->dialect >= SMB30_PROT_ID) {
 106                         smb3_hdr = (struct smb3_hdr_req *)shdr;
 107                         /*
 108                          * if primary channel is not set yet, use default
 109                          * channel for chan sequence num
 110                          */
 111                         if (SERVER_IS_CHAN(server))
 112                                 smb3_hdr->ChannelSequence =
 113                                         cpu_to_le16(server->primary_server->channel_sequence_num);
 114                         else
 115                                 smb3_hdr->ChannelSequence =
 116                                         cpu_to_le16(server->channel_sequence_num);
 117                 }
 118                 spin_lock(&server->req_lock);
 119                 /* Request up to 10 credits but don't go over the limit. */
 120                 if (server->credits >= server->max_credits)
 121                         shdr->CreditRequest = cpu_to_le16(0);
 122                 else
 123                         shdr->CreditRequest = cpu_to_le16(
 124                                 min_t(int, server->max_credits -
 125                                                 server->credits, 10));
 126                 spin_unlock(&server->req_lock);
 127         } else {
 128                 shdr->CreditRequest = cpu_to_le16(2);
 129         }
 130         shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
 131
 132         if (!tcon)
 133                 goto out;
 134
 135         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 136         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 137         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 138                 shdr->CreditCharge = cpu_to_le16(1);
 139         /* else CreditCharge MBZ */
 140
 141         shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
 142         /* Uid is not converted */
 143         if (tcon->ses)
 144                 shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
 145
 146         /*
 147          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 148          * to pass the path on the Open SMB prefixed by \\server\share.
 149          * Not sure when we would need to do the augmented path (if ever) and
 150          * setting this flag breaks the SMB2 open operation since it is
 151          * illegal to send an empty path name (without \\server\share prefix)
 152          * when the DFS flag is set in the SMB open header. We could
 153          * consider setting the flag on all operations other than open
 154          * but it is safer to net set it for now.
 155          */
 156 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 157                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 158
 159         if (server && server->sign && !smb3_encryption_required(tcon))
 160                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 161 out:
 162         return;
 163 }
 164
 165 /* helper function for code reuse */
 166 static int
 167 cifs_chan_skip_or_disable(struct cifs_ses *ses,
 168                           struct TCP_Server_Info *server,
 169                           bool from_reconnect)
 170 {
 171         struct TCP_Server_Info *pserver;
 172         unsigned int chan_index;
 173
 174         if (SERVER_IS_CHAN(server)) {
 175                 cifs_dbg(VFS,
 176                         "server %s does not support multichannel anymore. Skip secondary channel\n",
 177                          ses->server->hostname);
 178
 179                 spin_lock(&ses->chan_lock);
 180                 chan_index = cifs_ses_get_chan_index(ses, server);
 181                 if (chan_index == CIFS_INVAL_CHAN_INDEX) {
 182                         spin_unlock(&ses->chan_lock);
 183                         goto skip_terminate;
 184                 }
 185
 186                 ses->chans[chan_index].server = NULL;
 187                 server->terminate = true;
 188                 spin_unlock(&ses->chan_lock);
 189
 190                 /*
 191                  * the above reference of server by channel
 192                  * needs to be dropped without holding chan_lock
 193                  * as cifs_put_tcp_session takes a higher lock
 194                  * i.e. cifs_tcp_ses_lock
 195                  */
 196                 cifs_put_tcp_session(server, from_reconnect);
 197
 198                 cifs_signal_cifsd_for_reconnect(server, false);
 199
 200                 /* mark primary server as needing reconnect */
 201                 pserver = server->primary_server;
 202                 cifs_signal_cifsd_for_reconnect(pserver, false);
 203 skip_terminate:
 204                 return -EHOSTDOWN;
 205         }
 206
 207         cifs_server_dbg(VFS,
 208                 "server does not support multichannel anymore. Disable all other channels\n");
 209         cifs_disable_secondary_channels(ses);
 210
 211
 212         return 0;
 213 }
 214
 215 static int
 216 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 217                struct TCP_Server_Info *server, bool from_reconnect)
 218 {
 219         struct cifs_ses *ses;
 220         int xid;
 221         int rc = 0;
 222
 223         /*
 224          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 225          * check for tcp and smb session status done differently
 226          * for those three - in the calling routine.
 227          */
 228         if (tcon == NULL)
 229                 return 0;
 230
 231         if (smb2_command == SMB2_TREE_CONNECT)
 232                 return 0;
 233
 234         spin_lock(&tcon->tc_lock);
 235         if (tcon->status == TID_EXITING) {
 236                 /*
 237                  * only tree disconnect allowed when disconnecting ...
 238                  */
 239                 if (smb2_command != SMB2_TREE_DISCONNECT) {
 240                         spin_unlock(&tcon->tc_lock);
 241                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 242                                  smb2_command);
 243                         return -ENODEV;
 244                 }
 245         }
 246         spin_unlock(&tcon->tc_lock);
 247
 248         ses = tcon->ses;
 249         if (!ses)
 250                 return -EIO;
 251         spin_lock(&ses->ses_lock);
 252         if (ses->ses_status == SES_EXITING) {
 253                 spin_unlock(&ses->ses_lock);
 254                 return -EIO;
 255         }
 256         spin_unlock(&ses->ses_lock);
 257         if (!ses->server || !server)
 258                 return -EIO;
 259
 260         spin_lock(&server->srv_lock);
 261         if (server->tcpStatus == CifsNeedReconnect) {
 262                 /*
 263                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 264                  * here since they are implicitly done when session drops.
 265                  */
 266                 switch (smb2_command) {
 267                 /*
 268                  * BB Should we keep oplock break and add flush to exceptions?
 269                  */
 270                 case SMB2_TREE_DISCONNECT:
 271                 case SMB2_CANCEL:
 272                 case SMB2_CLOSE:
 273                 case SMB2_OPLOCK_BREAK:
 274                         spin_unlock(&server->srv_lock);
 275                         return -EAGAIN;
 276                 }
 277         }
 278
 279         /* if server is marked for termination, cifsd will cleanup */
 280         if (server->terminate) {
 281                 spin_unlock(&server->srv_lock);
 282                 return -EHOSTDOWN;
 283         }
 284         spin_unlock(&server->srv_lock);
 285
 286 again:
 287         rc = cifs_wait_for_server_reconnect(server, tcon->retry);
 288         if (rc)
 289                 return rc;
 290
 291         spin_lock(&ses->chan_lock);
 292         if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
 293                 spin_unlock(&ses->chan_lock);
 294                 return 0;
 295         }
 296         spin_unlock(&ses->chan_lock);
 297         cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
 298                  tcon->ses->chans_need_reconnect,
 299                  tcon->need_reconnect);
 300
 301         mutex_lock(&ses->session_mutex);
 302         /*
 303          * if this is called by delayed work, and the channel has been disabled
 304          * in parallel, the delayed work can continue to execute in parallel
 305          * there's a chance that this channel may not exist anymore
 306          */
 307         spin_lock(&server->srv_lock);
 308         if (server->tcpStatus == CifsExiting) {
 309                 spin_unlock(&server->srv_lock);
 310                 mutex_unlock(&ses->session_mutex);
 311                 rc = -EHOSTDOWN;
 312                 goto out;
 313         }
 314
 315         /*
 316          * Recheck after acquire mutex. If another thread is negotiating
 317          * and the server never sends an answer the socket will be closed
 318          * and tcpStatus set to reconnect.
 319          */
 320         if (server->tcpStatus == CifsNeedReconnect) {
 321                 spin_unlock(&server->srv_lock);
 322                 mutex_unlock(&ses->session_mutex);
 323
 324                 if (tcon->retry)
 325                         goto again;
 326
 327                 rc = -EHOSTDOWN;
 328                 goto out;
 329         }
 330         spin_unlock(&server->srv_lock);
 331
 332         /*
 333          * need to prevent multiple threads trying to simultaneously
 334          * reconnect the same SMB session
 335          */
 336         spin_lock(&ses->ses_lock);
 337         spin_lock(&ses->chan_lock);
 338         if (!cifs_chan_needs_reconnect(ses, server) &&
 339             ses->ses_status == SES_GOOD) {
 340                 spin_unlock(&ses->chan_lock);
 341                 spin_unlock(&ses->ses_lock);
 342                 /* this means that we only need to tree connect */
 343                 if (tcon->need_reconnect)
 344                         goto skip_sess_setup;
 345
 346                 mutex_unlock(&ses->session_mutex);
 347                 goto out;
 348         }
 349         spin_unlock(&ses->chan_lock);
 350         spin_unlock(&ses->ses_lock);
 351
 352         rc = cifs_negotiate_protocol(0, ses, server);
 353         if (!rc) {
 354                 /*
 355                  * if server stopped supporting multichannel
 356                  * and the first channel reconnected, disable all the others.
 357                  */
 358                 if (ses->chan_count > 1 &&
 359                     !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
 360                         rc = cifs_chan_skip_or_disable(ses, server,
 361                                                        from_reconnect);
 362                         if (rc) {
 363                                 mutex_unlock(&ses->session_mutex);
 364                                 goto out;
 365                         }
 366                 }
 367
 368                 rc = cifs_setup_session(0, ses, server, ses->local_nls);
 369                 if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
 370                         /*
 371                          * Try alternate password for next reconnect (key rotation
 372                          * could be enabled on the server e.g.) if an alternate
 373                          * password is available and the current password is expired,
 374                          * but do not swap on non pwd related errors like host down
 375                          */
 376                         if (ses->password2)
 377                                 swap(ses->password2, ses->password);
 378                 }
 379
 380                 if ((rc == -EACCES) && !tcon->retry) {
 381                         mutex_unlock(&ses->session_mutex);
 382                         rc = -EHOSTDOWN;
 383                         goto failed;
 384                 } else if (rc) {
 385                         mutex_unlock(&ses->session_mutex);
 386                         goto out;
 387                 }
 388         } else {
 389                 mutex_unlock(&ses->session_mutex);
 390                 goto out;
 391         }
 392
 393 skip_sess_setup:
 394         if (!tcon->need_reconnect) {
 395                 mutex_unlock(&ses->session_mutex);
 396                 goto out;
 397         }
 398         cifs_mark_open_files_invalid(tcon);
 399         if (tcon->use_persistent)
 400                 tcon->need_reopen_files = true;
 401
 402         rc = cifs_tree_connect(0, tcon);
 403
 404         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 405         if (rc) {
 406                 /* If sess reconnected but tcon didn't, something strange ... */
 407                 mutex_unlock(&ses->session_mutex);
 408                 cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
 409                 goto out;
 410         }
 411
 412         spin_lock(&ses->ses_lock);
 413         if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) {
 414                 spin_unlock(&ses->ses_lock);
 415                 mutex_unlock(&ses->session_mutex);
 416                 goto skip_add_channels;
 417         }
 418         ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS;
 419         spin_unlock(&ses->ses_lock);
 420
 421         if (!rc &&
 422             (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) &&
 423             server->ops->query_server_interfaces) {
 424                 mutex_unlock(&ses->session_mutex);
 425
 426                 /*
 427                  * query server network interfaces, in case they change
 428                  */
 429                 xid = get_xid();
 430                 rc = server->ops->query_server_interfaces(xid, tcon, false);
 431                 free_xid(xid);
 432
 433                 if (rc == -EOPNOTSUPP && ses->chan_count > 1) {
 434                         /*
 435                          * some servers like Azure SMB server do not advertise
 436                          * that multichannel has been disabled with server
 437                          * capabilities, rather return STATUS_NOT_IMPLEMENTED.
 438                          * treat this as server not supporting multichannel
 439                          */
 440
 441                         rc = cifs_chan_skip_or_disable(ses, server,
 442                                                        from_reconnect);
 443                         goto skip_add_channels;
 444                 } else if (rc)
 445                         cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
 446                                  __func__, rc);
 447
 448                 if (ses->chan_max > ses->chan_count &&
 449                     ses->iface_count &&
 450                     !SERVER_IS_CHAN(server)) {
 451                         if (ses->chan_count == 1) {
 452                                 cifs_server_dbg(VFS, "supports multichannel now\n");
 453                                 queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
 454                                                  (SMB_INTERFACE_POLL_INTERVAL * HZ));
 455                         }
 456
 457                         cifs_try_adding_channels(ses);
 458                 }
 459         } else {
 460                 mutex_unlock(&ses->session_mutex);
 461         }
 462
 463 skip_add_channels:
 464         spin_lock(&ses->ses_lock);
 465         ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS;
 466         spin_unlock(&ses->ses_lock);
 467
 468         if (smb2_command != SMB2_INTERNAL_CMD)
 469                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 470
 471         atomic_inc(&tconInfoReconnectCount);
 472 out:
 473         /*
 474          * Check if handle based operation so we know whether we can continue
 475          * or not without returning to caller to reset file handle.
 476          */
 477         /*
 478          * BB Is flush done by server on drop of tcp session? Should we special
 479          * case it and skip above?
 480          */
 481         switch (smb2_command) {
 482         case SMB2_FLUSH:
 483         case SMB2_READ:
 484         case SMB2_WRITE:
 485         case SMB2_LOCK:
 486         case SMB2_QUERY_DIRECTORY:
 487         case SMB2_CHANGE_NOTIFY:
 488         case SMB2_QUERY_INFO:
 489         case SMB2_SET_INFO:
 490         case SMB2_IOCTL:
 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 ||
1229              server->dialect == SMB302_PROT_ID) &&
1230             (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1231                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1232
1233         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1234                                                (struct smb2_hdr *)rsp);
1235         /*
1236          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1237          * for us will be
1238          *      ses->sectype = RawNTLMSSP;
1239          * but for time being this is our only auth choice so doesn't matter.
1240          * We just found a server which sets blob length to zero expecting raw.
1241          */
1242         if (blob_length == 0) {
1243                 cifs_dbg(FYI, "missing security blob on negprot\n");
1244                 server->sec_ntlmssp = true;
1245         }
1246
1247         rc = cifs_enable_signing(server, ses->sign);
1248         if (rc)
1249                 goto neg_exit;
1250         if (blob_length) {
1251                 rc = decode_negTokenInit(security_blob, blob_length, server);
1252                 if (rc == 1)
1253                         rc = 0;
1254                 else if (rc == 0)
1255                         rc = -EIO;
1256         }
1257
1258         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1259                 if (rsp->NegotiateContextCount)
1260                         rc = smb311_decode_neg_context(rsp, server,
1261                                                        rsp_iov.iov_len);
1262                 else
1263                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1264         }
1265
1266         if (server->cipher_type && !rc) {
1267                 if (!SERVER_IS_CHAN(server)) {
1268                         rc = smb3_crypto_aead_allocate(server);
1269                 } else {
1270                         /* For channels, just reuse the primary server crypto secmech. */
1271                         server->secmech.enc = server->primary_server->secmech.enc;
1272                         server->secmech.dec = server->primary_server->secmech.dec;
1273                 }
1274         }
1275 neg_exit:
1276         free_rsp_buf(resp_buftype, rsp);
1277         return rc;
1278 }
1279
1280 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1281 {
1282         int rc;
1283         struct validate_negotiate_info_req *pneg_inbuf;
1284         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1285         u32 rsplen;
1286         u32 inbuflen; /* max of 4 dialects */
1287         struct TCP_Server_Info *server = tcon->ses->server;
1288
1289         cifs_dbg(FYI, "validate negotiate\n");
1290
1291         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1292         if (server->dialect == SMB311_PROT_ID)
1293                 return 0;
1294
1295         /*
1296          * validation ioctl must be signed, so no point sending this if we
1297          * can not sign it (ie are not known user).  Even if signing is not
1298          * required (enabled but not negotiated), in those cases we selectively
1299          * sign just this, the first and only signed request on a connection.
1300          * Having validation of negotiate info  helps reduce attack vectors.
1301          */
1302         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1303                 return 0; /* validation requires signing */
1304
1305         if (tcon->ses->user_name == NULL) {
1306                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1307                 return 0; /* validation requires signing */
1308         }
1309
1310         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1311                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1312
1313         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1314         if (!pneg_inbuf)
1315                 return -ENOMEM;
1316
1317         pneg_inbuf->Capabilities =
1318                         cpu_to_le32(server->vals->req_capabilities);
1319         if (tcon->ses->chan_max > 1)
1320                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1321
1322         memcpy(pneg_inbuf->Guid, server->client_guid,
1323                                         SMB2_CLIENT_GUID_SIZE);
1324
1325         if (tcon->ses->sign)
1326                 pneg_inbuf->SecurityMode =
1327                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1328         else if (global_secflags & CIFSSEC_MAY_SIGN)
1329                 pneg_inbuf->SecurityMode =
1330                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1331         else
1332                 pneg_inbuf->SecurityMode = 0;
1333
1334
1335         if (strcmp(server->vals->version_string,
1336                 SMB3ANY_VERSION_STRING) == 0) {
1337                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1338                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1339                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1340                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1341                 /* SMB 2.1 not included so subtract one dialect from len */
1342                 inbuflen = sizeof(*pneg_inbuf) -
1343                                 (sizeof(pneg_inbuf->Dialects[0]));
1344         } else if (strcmp(server->vals->version_string,
1345                 SMBDEFAULT_VERSION_STRING) == 0) {
1346                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1347                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1348                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1349                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1350                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1351                 /* structure is big enough for 4 dialects */
1352                 inbuflen = sizeof(*pneg_inbuf);
1353         } else {
1354                 /* otherwise specific dialect was requested */
1355                 pneg_inbuf->Dialects[0] =
1356                         cpu_to_le16(server->vals->protocol_id);
1357                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1358                 /* structure is big enough for 4 dialects, sending only 1 */
1359                 inbuflen = sizeof(*pneg_inbuf) -
1360                                 sizeof(pneg_inbuf->Dialects[0]) * 3;
1361         }
1362
1363         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1364                 FSCTL_VALIDATE_NEGOTIATE_INFO,
1365                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1366                 (char **)&pneg_rsp, &rsplen);
1367         if (rc == -EOPNOTSUPP) {
1368                 /*
1369                  * Old Windows versions or Netapp SMB server can return
1370                  * not supported error. Client should accept it.
1371                  */
1372                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1373                 rc = 0;
1374                 goto out_free_inbuf;
1375         } else if (rc != 0) {
1376                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1377                               rc);
1378                 rc = -EIO;
1379                 goto out_free_inbuf;
1380         }
1381
1382         rc = -EIO;
1383         if (rsplen != sizeof(*pneg_rsp)) {
1384                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1385                               rsplen);
1386
1387                 /* relax check since Mac returns max bufsize allowed on ioctl */
1388                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1389                         goto out_free_rsp;
1390         }
1391
1392         /* check validate negotiate info response matches what we got earlier */
1393         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1394                 goto vneg_out;
1395
1396         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1397                 goto vneg_out;
1398
1399         /* do not validate server guid because not saved at negprot time yet */
1400
1401         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1402               SMB2_LARGE_FILES) != server->capabilities)
1403                 goto vneg_out;
1404
1405         /* validate negotiate successful */
1406         rc = 0;
1407         cifs_dbg(FYI, "validate negotiate info successful\n");
1408         goto out_free_rsp;
1409
1410 vneg_out:
1411         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1412 out_free_rsp:
1413         kfree(pneg_rsp);
1414 out_free_inbuf:
1415         kfree(pneg_inbuf);
1416         return rc;
1417 }
1418
1419 enum securityEnum
1420 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1421 {
1422         switch (requested) {
1423         case Kerberos:
1424         case RawNTLMSSP:
1425                 return requested;
1426         case NTLMv2:
1427                 return RawNTLMSSP;
1428         case Unspecified:
1429                 if (server->sec_ntlmssp &&
1430                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1431                         return RawNTLMSSP;
1432                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1433                         (global_secflags & CIFSSEC_MAY_KRB5))
1434                         return Kerberos;
1435                 fallthrough;
1436         default:
1437                 return Unspecified;
1438         }
1439 }
1440
1441 struct SMB2_sess_data {
1442         unsigned int xid;
1443         struct cifs_ses *ses;
1444         struct TCP_Server_Info *server;
1445         struct nls_table *nls_cp;
1446         void (*func)(struct SMB2_sess_data *);
1447         int result;
1448         u64 previous_session;
1449
1450         /* we will send the SMB in three pieces:
1451          * a fixed length beginning part, an optional
1452          * SPNEGO blob (which can be zero length), and a
1453          * last part which will include the strings
1454          * and rest of bcc area. This allows us to avoid
1455          * a large buffer 17K allocation
1456          */
1457         int buf0_type;
1458         struct kvec iov[2];
1459 };
1460
1461 static int
1462 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1463 {
1464         int rc;
1465         struct cifs_ses *ses = sess_data->ses;
1466         struct TCP_Server_Info *server = sess_data->server;
1467         struct smb2_sess_setup_req *req;
1468         unsigned int total_len;
1469         bool is_binding = false;
1470
1471         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1472                                  (void **) &req,
1473                                  &total_len);
1474         if (rc)
1475                 return rc;
1476
1477         spin_lock(&ses->ses_lock);
1478         is_binding = (ses->ses_status == SES_GOOD);
1479         spin_unlock(&ses->ses_lock);
1480
1481         if (is_binding) {
1482                 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1483                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1484                 req->PreviousSessionId = 0;
1485                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1486                 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1487         } else {
1488                 /* First session, not a reauthenticate */
1489                 req->hdr.SessionId = 0;
1490                 /*
1491                  * if reconnect, we need to send previous sess id
1492                  * otherwise it is 0
1493                  */
1494                 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1495                 req->Flags = 0; /* MBZ */
1496                 cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1497                          sess_data->previous_session);
1498         }
1499
1500         /* enough to enable echos and oplocks and one max size write */
1501         if (server->credits >= server->max_credits)
1502                 req->hdr.CreditRequest = cpu_to_le16(0);
1503         else
1504                 req->hdr.CreditRequest = cpu_to_le16(
1505                         min_t(int, server->max_credits -
1506                               server->credits, 130));
1507
1508         /* only one of SMB2 signing flags may be set in SMB2 request */
1509         if (server->sign)
1510                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1511         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1512                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1513         else
1514                 req->SecurityMode = 0;
1515
1516 #ifdef CONFIG_CIFS_DFS_UPCALL
1517         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1518 #else
1519         req->Capabilities = 0;
1520 #endif /* DFS_UPCALL */
1521
1522         req->Channel = 0; /* MBZ */
1523
1524         sess_data->iov[0].iov_base = (char *)req;
1525         /* 1 for pad */
1526         sess_data->iov[0].iov_len = total_len - 1;
1527         /*
1528          * This variable will be used to clear the buffer
1529          * allocated above in case of any error in the calling function.
1530          */
1531         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1532
1533         return 0;
1534 }
1535
1536 static void
1537 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1538 {
1539         struct kvec *iov = sess_data->iov;
1540
1541         /* iov[1] is already freed by caller */
1542         if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1543                 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1544
1545         free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1546         sess_data->buf0_type = CIFS_NO_BUFFER;
1547 }
1548
1549 static int
1550 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1551 {
1552         int rc;
1553         struct smb_rqst rqst;
1554         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1555         struct kvec rsp_iov = { NULL, 0 };
1556
1557         /* Testing shows that buffer offset must be at location of Buffer[0] */
1558         req->SecurityBufferOffset =
1559                 cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1560         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1561
1562         memset(&rqst, 0, sizeof(struct smb_rqst));
1563         rqst.rq_iov = sess_data->iov;
1564         rqst.rq_nvec = 2;
1565
1566         /* BB add code to build os and lm fields */
1567         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1568                             sess_data->server,
1569                             &rqst,
1570                             &sess_data->buf0_type,
1571                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1572         cifs_small_buf_release(sess_data->iov[0].iov_base);
1573         if (rc == 0)
1574                 sess_data->ses->expired_pwd = false;
1575         else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
1576                 if (sess_data->ses->expired_pwd == false)
1577                         trace_smb3_key_expired(sess_data->server->hostname,
1578                                                sess_data->ses->user_name,
1579                                                sess_data->server->conn_id,
1580                                                &sess_data->server->dstaddr, rc);
1581                 sess_data->ses->expired_pwd = true;
1582         }
1583
1584         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1585
1586         return rc;
1587 }
1588
1589 static int
1590 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1591 {
1592         int rc = 0;
1593         struct cifs_ses *ses = sess_data->ses;
1594         struct TCP_Server_Info *server = sess_data->server;
1595
1596         cifs_server_lock(server);
1597         if (server->ops->generate_signingkey) {
1598                 rc = server->ops->generate_signingkey(ses, server);
1599                 if (rc) {
1600                         cifs_dbg(FYI,
1601                                 "SMB3 session key generation failed\n");
1602                         cifs_server_unlock(server);
1603                         return rc;
1604                 }
1605         }
1606         if (!server->session_estab) {
1607                 server->sequence_number = 0x2;
1608                 server->session_estab = true;
1609         }
1610         cifs_server_unlock(server);
1611
1612         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1613         return rc;
1614 }
1615
1616 #ifdef CONFIG_CIFS_UPCALL
1617 static void
1618 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1619 {
1620         int rc;
1621         struct cifs_ses *ses = sess_data->ses;
1622         struct TCP_Server_Info *server = sess_data->server;
1623         struct cifs_spnego_msg *msg;
1624         struct key *spnego_key = NULL;
1625         struct smb2_sess_setup_rsp *rsp = NULL;
1626         bool is_binding = false;
1627
1628         rc = SMB2_sess_alloc_buffer(sess_data);
1629         if (rc)
1630                 goto out;
1631
1632         spnego_key = cifs_get_spnego_key(ses, server);
1633         if (IS_ERR(spnego_key)) {
1634                 rc = PTR_ERR(spnego_key);
1635                 if (rc == -ENOKEY)
1636                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1637                 spnego_key = NULL;
1638                 goto out;
1639         }
1640
1641         msg = spnego_key->payload.data[0];
1642         /*
1643          * check version field to make sure that cifs.upcall is
1644          * sending us a response in an expected form
1645          */
1646         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1647                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1648                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1649                 rc = -EKEYREJECTED;
1650                 goto out_put_spnego_key;
1651         }
1652
1653         spin_lock(&ses->ses_lock);
1654         is_binding = (ses->ses_status == SES_GOOD);
1655         spin_unlock(&ses->ses_lock);
1656
1657         /* keep session key if binding */
1658         if (!is_binding) {
1659                 kfree_sensitive(ses->auth_key.response);
1660                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1661                                                  GFP_KERNEL);
1662                 if (!ses->auth_key.response) {
1663                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1664                                  msg->sesskey_len);
1665                         rc = -ENOMEM;
1666                         goto out_put_spnego_key;
1667                 }
1668                 ses->auth_key.len = msg->sesskey_len;
1669         }
1670
1671         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1672         sess_data->iov[1].iov_len = msg->secblob_len;
1673
1674         rc = SMB2_sess_sendreceive(sess_data);
1675         if (rc)
1676                 goto out_put_spnego_key;
1677
1678         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1679         /* keep session id and flags if binding */
1680         if (!is_binding) {
1681                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1682                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1683         }
1684
1685         rc = SMB2_sess_establish_session(sess_data);
1686 out_put_spnego_key:
1687         key_invalidate(spnego_key);
1688         key_put(spnego_key);
1689         if (rc) {
1690                 kfree_sensitive(ses->auth_key.response);
1691                 ses->auth_key.response = NULL;
1692                 ses->auth_key.len = 0;
1693         }
1694 out:
1695         sess_data->result = rc;
1696         sess_data->func = NULL;
1697         SMB2_sess_free_buffer(sess_data);
1698 }
1699 #else
1700 static void
1701 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1702 {
1703         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1704         sess_data->result = -EOPNOTSUPP;
1705         sess_data->func = NULL;
1706 }
1707 #endif
1708
1709 static void
1710 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1711
1712 static void
1713 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1714 {
1715         int rc;
1716         struct cifs_ses *ses = sess_data->ses;
1717         struct TCP_Server_Info *server = sess_data->server;
1718         struct smb2_sess_setup_rsp *rsp = NULL;
1719         unsigned char *ntlmssp_blob = NULL;
1720         bool use_spnego = false; /* else use raw ntlmssp */
1721         u16 blob_length = 0;
1722         bool is_binding = false;
1723
1724         /*
1725          * If memory allocation is successful, caller of this function
1726          * frees it.
1727          */
1728         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1729         if (!ses->ntlmssp) {
1730                 rc = -ENOMEM;
1731                 goto out_err;
1732         }
1733         ses->ntlmssp->sesskey_per_smbsess = true;
1734
1735         rc = SMB2_sess_alloc_buffer(sess_data);
1736         if (rc)
1737                 goto out_err;
1738
1739         rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1740                                           &blob_length, ses, server,
1741                                           sess_data->nls_cp);
1742         if (rc)
1743                 goto out;
1744
1745         if (use_spnego) {
1746                 /* BB eventually need to add this */
1747                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1748                 rc = -EOPNOTSUPP;
1749                 goto out;
1750         }
1751         sess_data->iov[1].iov_base = ntlmssp_blob;
1752         sess_data->iov[1].iov_len = blob_length;
1753
1754         rc = SMB2_sess_sendreceive(sess_data);
1755         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1756
1757         /* If true, rc here is expected and not an error */
1758         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1759                 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1760                 rc = 0;
1761
1762         if (rc)
1763                 goto out;
1764
1765         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1766                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1767                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1768                         le16_to_cpu(rsp->SecurityBufferOffset));
1769                 rc = -EIO;
1770                 goto out;
1771         }
1772         rc = decode_ntlmssp_challenge(rsp->Buffer,
1773                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1774         if (rc)
1775                 goto out;
1776
1777         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1778
1779         spin_lock(&ses->ses_lock);
1780         is_binding = (ses->ses_status == SES_GOOD);
1781         spin_unlock(&ses->ses_lock);
1782
1783         /* keep existing ses id and flags if binding */
1784         if (!is_binding) {
1785                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1786                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1787         }
1788
1789 out:
1790         kfree_sensitive(ntlmssp_blob);
1791         SMB2_sess_free_buffer(sess_data);
1792         if (!rc) {
1793                 sess_data->result = 0;
1794                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1795                 return;
1796         }
1797 out_err:
1798         kfree_sensitive(ses->ntlmssp);
1799         ses->ntlmssp = NULL;
1800         sess_data->result = rc;
1801         sess_data->func = NULL;
1802 }
1803
1804 static void
1805 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1806 {
1807         int rc;
1808         struct cifs_ses *ses = sess_data->ses;
1809         struct TCP_Server_Info *server = sess_data->server;
1810         struct smb2_sess_setup_req *req;
1811         struct smb2_sess_setup_rsp *rsp = NULL;
1812         unsigned char *ntlmssp_blob = NULL;
1813         bool use_spnego = false; /* else use raw ntlmssp */
1814         u16 blob_length = 0;
1815         bool is_binding = false;
1816
1817         rc = SMB2_sess_alloc_buffer(sess_data);
1818         if (rc)
1819                 goto out;
1820
1821         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1822         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1823
1824         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1825                                      ses, server,
1826                                      sess_data->nls_cp);
1827         if (rc) {
1828                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1829                 goto out;
1830         }
1831
1832         if (use_spnego) {
1833                 /* BB eventually need to add this */
1834                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1835                 rc = -EOPNOTSUPP;
1836                 goto out;
1837         }
1838         sess_data->iov[1].iov_base = ntlmssp_blob;
1839         sess_data->iov[1].iov_len = blob_length;
1840
1841         rc = SMB2_sess_sendreceive(sess_data);
1842         if (rc)
1843                 goto out;
1844
1845         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1846
1847         spin_lock(&ses->ses_lock);
1848         is_binding = (ses->ses_status == SES_GOOD);
1849         spin_unlock(&ses->ses_lock);
1850
1851         /* keep existing ses id and flags if binding */
1852         if (!is_binding) {
1853                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1854                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1855         }
1856
1857         rc = SMB2_sess_establish_session(sess_data);
1858 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1859         if (ses->server->dialect < SMB30_PROT_ID) {
1860                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1861                 /*
1862                  * The session id is opaque in terms of endianness, so we can't
1863                  * print it as a long long. we dump it as we got it on the wire
1864                  */
1865                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1866                          &ses->Suid);
1867                 cifs_dbg(VFS, "Session Key   %*ph\n",
1868                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1869                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1870                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1871         }
1872 #endif
1873 out:
1874         kfree_sensitive(ntlmssp_blob);
1875         SMB2_sess_free_buffer(sess_data);
1876         kfree_sensitive(ses->ntlmssp);
1877         ses->ntlmssp = NULL;
1878         sess_data->result = rc;
1879         sess_data->func = NULL;
1880 }
1881
1882 static int
1883 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1884 {
1885         int type;
1886         struct cifs_ses *ses = sess_data->ses;
1887         struct TCP_Server_Info *server = sess_data->server;
1888
1889         type = smb2_select_sectype(server, ses->sectype);
1890         cifs_dbg(FYI, "sess setup type %d\n", type);
1891         if (type == Unspecified) {
1892                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1893                 return -EINVAL;
1894         }
1895
1896         switch (type) {
1897         case Kerberos:
1898                 sess_data->func = SMB2_auth_kerberos;
1899                 break;
1900         case RawNTLMSSP:
1901                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1902                 break;
1903         default:
1904                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1905                 return -EOPNOTSUPP;
1906         }
1907
1908         return 0;
1909 }
1910
1911 int
1912 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1913                 struct TCP_Server_Info *server,
1914                 const struct nls_table *nls_cp)
1915 {
1916         int rc = 0;
1917         struct SMB2_sess_data *sess_data;
1918
1919         cifs_dbg(FYI, "Session Setup\n");
1920
1921         if (!server) {
1922                 WARN(1, "%s: server is NULL!\n", __func__);
1923                 return -EIO;
1924         }
1925
1926         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1927         if (!sess_data)
1928                 return -ENOMEM;
1929
1930         sess_data->xid = xid;
1931         sess_data->ses = ses;
1932         sess_data->server = server;
1933         sess_data->buf0_type = CIFS_NO_BUFFER;
1934         sess_data->nls_cp = (struct nls_table *) nls_cp;
1935         sess_data->previous_session = ses->Suid;
1936
1937         rc = SMB2_select_sec(sess_data);
1938         if (rc)
1939                 goto out;
1940
1941         /*
1942          * Initialize the session hash with the server one.
1943          */
1944         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1945                SMB2_PREAUTH_HASH_SIZE);
1946
1947         while (sess_data->func)
1948                 sess_data->func(sess_data);
1949
1950         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1951                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1952         rc = sess_data->result;
1953 out:
1954         kfree_sensitive(sess_data);
1955         return rc;
1956 }
1957
1958 int
1959 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1960 {
1961         struct smb_rqst rqst;
1962         struct smb2_logoff_req *req; /* response is also trivial struct */
1963         int rc = 0;
1964         struct TCP_Server_Info *server;
1965         int flags = 0;
1966         unsigned int total_len;
1967         struct kvec iov[1];
1968         struct kvec rsp_iov;
1969         int resp_buf_type;
1970
1971         cifs_dbg(FYI, "disconnect session %p\n", ses);
1972
1973         if (ses && (ses->server))
1974                 server = ses->server;
1975         else
1976                 return -EIO;
1977
1978         /* no need to send SMB logoff if uid already closed due to reconnect */
1979         spin_lock(&ses->chan_lock);
1980         if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1981                 spin_unlock(&ses->chan_lock);
1982                 goto smb2_session_already_dead;
1983         }
1984         spin_unlock(&ses->chan_lock);
1985
1986         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1987                                  (void **) &req, &total_len);
1988         if (rc)
1989                 return rc;
1990
1991          /* since no tcon, smb2_init can not do this, so do here */
1992         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1993
1994         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1995                 flags |= CIFS_TRANSFORM_REQ;
1996         else if (server->sign)
1997                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1998
1999         flags |= CIFS_NO_RSP_BUF;
2000
2001         iov[0].iov_base = (char *)req;
2002         iov[0].iov_len = total_len;
2003
2004         memset(&rqst, 0, sizeof(struct smb_rqst));
2005         rqst.rq_iov = iov;
2006         rqst.rq_nvec = 1;
2007
2008         rc = cifs_send_recv(xid, ses, ses->server,
2009                             &rqst, &resp_buf_type, flags, &rsp_iov);
2010         cifs_small_buf_release(req);
2011         /*
2012          * No tcon so can't do
2013          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
2014          */
2015
2016 smb2_session_already_dead:
2017         return rc;
2018 }
2019
2020 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
2021 {
2022         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
2023 }
2024
2025 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
2026
2027 /* These are similar values to what Windows uses */
2028 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
2029 {
2030         tcon->max_chunks = 256;
2031         tcon->max_bytes_chunk = 1048576;
2032         tcon->max_bytes_copy = 16777216;
2033 }
2034
2035 int
2036 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
2037           struct cifs_tcon *tcon, const struct nls_table *cp)
2038 {
2039         struct smb_rqst rqst;
2040         struct smb2_tree_connect_req *req;
2041         struct smb2_tree_connect_rsp *rsp = NULL;
2042         struct kvec iov[2];
2043         struct kvec rsp_iov = { NULL, 0 };
2044         int rc = 0;
2045         int resp_buftype;
2046         int unc_path_len;
2047         __le16 *unc_path = NULL;
2048         int flags = 0;
2049         unsigned int total_len;
2050         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2051
2052         cifs_dbg(FYI, "TCON\n");
2053
2054         if (!server || !tree)
2055                 return -EIO;
2056
2057         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
2058         if (unc_path == NULL)
2059                 return -ENOMEM;
2060
2061         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
2062         if (unc_path_len <= 0) {
2063                 kfree(unc_path);
2064                 return -EINVAL;
2065         }
2066         unc_path_len *= 2;
2067
2068         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
2069         tcon->tid = 0;
2070         atomic_set(&tcon->num_remote_opens, 0);
2071         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
2072                                  (void **) &req, &total_len);
2073         if (rc) {
2074                 kfree(unc_path);
2075                 return rc;
2076         }
2077
2078         if (smb3_encryption_required(tcon))
2079                 flags |= CIFS_TRANSFORM_REQ;
2080
2081         iov[0].iov_base = (char *)req;
2082         /* 1 for pad */
2083         iov[0].iov_len = total_len - 1;
2084
2085         /* Testing shows that buffer offset must be at location of Buffer[0] */
2086         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
2087         req->PathLength = cpu_to_le16(unc_path_len);
2088         iov[1].iov_base = unc_path;
2089         iov[1].iov_len = unc_path_len;
2090
2091         /*
2092          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
2093          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
2094          * (Samba servers don't always set the flag so also check if null user)
2095          */
2096         if ((server->dialect == SMB311_PROT_ID) &&
2097             !smb3_encryption_required(tcon) &&
2098             !(ses->session_flags &
2099                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
2100             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
2101                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
2102
2103         memset(&rqst, 0, sizeof(struct smb_rqst));
2104         rqst.rq_iov = iov;
2105         rqst.rq_nvec = 2;
2106
2107         /* Need 64 for max size write so ask for more in case not there yet */
2108         if (server->credits >= server->max_credits)
2109                 req->hdr.CreditRequest = cpu_to_le16(0);
2110         else
2111                 req->hdr.CreditRequest = cpu_to_le16(
2112                         min_t(int, server->max_credits -
2113                               server->credits, 64));
2114
2115         rc = cifs_send_recv(xid, ses, server,
2116                             &rqst, &resp_buftype, flags, &rsp_iov);
2117         cifs_small_buf_release(req);
2118         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
2119         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
2120         if ((rc != 0) || (rsp == NULL)) {
2121                 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
2122                 tcon->need_reconnect = true;
2123                 goto tcon_error_exit;
2124         }
2125
2126         switch (rsp->ShareType) {
2127         case SMB2_SHARE_TYPE_DISK:
2128                 cifs_dbg(FYI, "connection to disk share\n");
2129                 break;
2130         case SMB2_SHARE_TYPE_PIPE:
2131                 tcon->pipe = true;
2132                 cifs_dbg(FYI, "connection to pipe share\n");
2133                 break;
2134         case SMB2_SHARE_TYPE_PRINT:
2135                 tcon->print = true;
2136                 cifs_dbg(FYI, "connection to printer\n");
2137                 break;
2138         default:
2139                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
2140                 rc = -EOPNOTSUPP;
2141                 goto tcon_error_exit;
2142         }
2143
2144         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
2145         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
2146         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
2147         tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
2148         strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
2149
2150         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
2151             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
2152                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
2153
2154         if (tcon->seal &&
2155             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
2156                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
2157
2158         init_copy_chunk_defaults(tcon);
2159         if (server->ops->validate_negotiate)
2160                 rc = server->ops->validate_negotiate(xid, tcon);
2161         if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
2162                 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
2163                         server->nosharesock = true;
2164 tcon_exit:
2165
2166         free_rsp_buf(resp_buftype, rsp);
2167         kfree(unc_path);
2168         return rc;
2169
2170 tcon_error_exit:
2171         if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
2172                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
2173         goto tcon_exit;
2174 }
2175
2176 int
2177 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
2178 {
2179         struct smb_rqst rqst;
2180         struct smb2_tree_disconnect_req *req; /* response is trivial */
2181         int rc = 0;
2182         struct cifs_ses *ses = tcon->ses;
2183         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2184         int flags = 0;
2185         unsigned int total_len;
2186         struct kvec iov[1];
2187         struct kvec rsp_iov;
2188         int resp_buf_type;
2189
2190         cifs_dbg(FYI, "Tree Disconnect\n");
2191
2192         if (!ses || !(ses->server))
2193                 return -EIO;
2194
2195         trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
2196         spin_lock(&ses->chan_lock);
2197         if ((tcon->need_reconnect) ||
2198             (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
2199                 spin_unlock(&ses->chan_lock);
2200                 return 0;
2201         }
2202         spin_unlock(&ses->chan_lock);
2203
2204         invalidate_all_cached_dirs(tcon);
2205
2206         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server,
2207                                  (void **) &req,
2208                                  &total_len);
2209         if (rc)
2210                 return rc;
2211
2212         if (smb3_encryption_required(tcon))
2213                 flags |= CIFS_TRANSFORM_REQ;
2214
2215         flags |= CIFS_NO_RSP_BUF;
2216
2217         iov[0].iov_base = (char *)req;
2218         iov[0].iov_len = total_len;
2219
2220         memset(&rqst, 0, sizeof(struct smb_rqst));
2221         rqst.rq_iov = iov;
2222         rqst.rq_nvec = 1;
2223
2224         rc = cifs_send_recv(xid, ses, server,
2225                             &rqst, &resp_buf_type, flags, &rsp_iov);
2226         cifs_small_buf_release(req);
2227         if (rc) {
2228                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2229                 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2230         }
2231         trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2232
2233         return rc;
2234 }
2235
2236
2237 static struct create_durable *
2238 create_durable_buf(void)
2239 {
2240         struct create_durable *buf;
2241
2242         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2243         if (!buf)
2244                 return NULL;
2245
2246         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2247                                         (struct create_durable, Data));
2248         buf->ccontext.DataLength = cpu_to_le32(16);
2249         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2250                                 (struct create_durable, Name));
2251         buf->ccontext.NameLength = cpu_to_le16(4);
2252         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2253         buf->Name[0] = 'D';
2254         buf->Name[1] = 'H';
2255         buf->Name[2] = 'n';
2256         buf->Name[3] = 'Q';
2257         return buf;
2258 }
2259
2260 static struct create_durable *
2261 create_reconnect_durable_buf(struct cifs_fid *fid)
2262 {
2263         struct create_durable *buf;
2264
2265         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2266         if (!buf)
2267                 return NULL;
2268
2269         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2270                                         (struct create_durable, Data));
2271         buf->ccontext.DataLength = cpu_to_le32(16);
2272         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2273                                 (struct create_durable, Name));
2274         buf->ccontext.NameLength = cpu_to_le16(4);
2275         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2276         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2277         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2278         buf->Name[0] = 'D';
2279         buf->Name[1] = 'H';
2280         buf->Name[2] = 'n';
2281         buf->Name[3] = 'C';
2282         return buf;
2283 }
2284
2285 static void
2286 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2287 {
2288         struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
2289
2290         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2291                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2292         buf->IndexNumber = pdisk_id->DiskFileId;
2293 }
2294
2295 static void
2296 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2297                  struct create_posix_rsp *posix)
2298 {
2299         int sid_len;
2300         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2301         u8 *end = beg + le32_to_cpu(cc->DataLength);
2302         u8 *sid;
2303
2304         memset(posix, 0, sizeof(*posix));
2305
2306         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2307         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2308         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2309
2310         sid = beg + 12;
2311         sid_len = posix_info_sid_size(sid, end);
2312         if (sid_len < 0) {
2313                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2314                 return;
2315         }
2316         memcpy(&posix->owner, sid, sid_len);
2317
2318         sid = sid + sid_len;
2319         sid_len = posix_info_sid_size(sid, end);
2320         if (sid_len < 0) {
2321                 cifs_dbg(VFS, "bad group sid in posix create response\n");
2322                 return;
2323         }
2324         memcpy(&posix->group, sid, sid_len);
2325
2326         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2327                  posix->nlink, posix->mode, posix->reparse_tag);
2328 }
2329
2330 int smb2_parse_contexts(struct TCP_Server_Info *server,
2331                         struct kvec *rsp_iov,
2332                         unsigned int *epoch,
2333                         char *lease_key, __u8 *oplock,
2334                         struct smb2_file_all_info *buf,
2335                         struct create_posix_rsp *posix)
2336 {
2337         struct smb2_create_rsp *rsp = rsp_iov->iov_base;
2338         struct create_context *cc;
2339         size_t rem, off, len;
2340         size_t doff, dlen;
2341         size_t noff, nlen;
2342         char *name;
2343         static const char smb3_create_tag_posix[] = {
2344                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2345                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2346                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2347         };
2348
2349         *oplock = 0;
2350
2351         off = le32_to_cpu(rsp->CreateContextsOffset);
2352         rem = le32_to_cpu(rsp->CreateContextsLength);
2353         if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)
2354                 return -EINVAL;
2355         cc = (struct create_context *)((u8 *)rsp + off);
2356
2357         /* Initialize inode number to 0 in case no valid data in qfid context */
2358         if (buf)
2359                 buf->IndexNumber = 0;
2360
2361         while (rem >= sizeof(*cc)) {
2362                 doff = le16_to_cpu(cc->DataOffset);
2363                 dlen = le32_to_cpu(cc->DataLength);
2364                 if (check_add_overflow(doff, dlen, &len) || len > rem)
2365                         return -EINVAL;
2366
2367                 noff = le16_to_cpu(cc->NameOffset);
2368                 nlen = le16_to_cpu(cc->NameLength);
2369                 if (noff + nlen > doff)
2370                         return -EINVAL;
2371
2372                 name = (char *)cc + noff;
2373                 switch (nlen) {
2374                 case 4:
2375                         if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
2376                                 *oplock = server->ops->parse_lease_buf(cc, epoch,
2377                                                                        lease_key);
2378                         } else if (buf &&
2379                                    !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {
2380                                 parse_query_id_ctxt(cc, buf);
2381                         }
2382                         break;
2383                 case 16:
2384                         if (posix && !memcmp(name, smb3_create_tag_posix, 16))
2385                                 parse_posix_ctxt(cc, buf, posix);
2386                         break;
2387                 default:
2388                         cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",
2389                                  __func__, nlen, dlen);
2390                         if (IS_ENABLED(CONFIG_CIFS_DEBUG2))
2391                                 cifs_dump_mem("context data: ", cc, dlen);
2392                         break;
2393                 }
2394
2395                 off = le32_to_cpu(cc->Next);
2396                 if (!off)
2397                         break;
2398                 if (check_sub_overflow(rem, off, &rem))
2399                         return -EINVAL;
2400                 cc = (struct create_context *)((u8 *)cc + off);
2401         }
2402
2403         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2404                 *oplock = rsp->OplockLevel;
2405
2406         return 0;
2407 }
2408
2409 static int
2410 add_lease_context(struct TCP_Server_Info *server,
2411                   struct smb2_create_req *req,
2412                   struct kvec *iov,
2413                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2414 {
2415         unsigned int num = *num_iovec;
2416
2417         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2418         if (iov[num].iov_base == NULL)
2419                 return -ENOMEM;
2420         iov[num].iov_len = server->vals->create_lease_size;
2421         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2422         *num_iovec = num + 1;
2423         return 0;
2424 }
2425
2426 static struct create_durable_v2 *
2427 create_durable_v2_buf(struct cifs_open_parms *oparms)
2428 {
2429         struct cifs_fid *pfid = oparms->fid;
2430         struct create_durable_v2 *buf;
2431
2432         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2433         if (!buf)
2434                 return NULL;
2435
2436         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2437                                         (struct create_durable_v2, dcontext));
2438         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2439         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2440                                 (struct create_durable_v2, Name));
2441         buf->ccontext.NameLength = cpu_to_le16(4);
2442
2443         /*
2444          * NB: Handle timeout defaults to 0, which allows server to choose
2445          * (most servers default to 120 seconds) and most clients default to 0.
2446          * This can be overridden at mount ("handletimeout=") if the user wants
2447          * a different persistent (or resilient) handle timeout for all opens
2448          * on a particular SMB3 mount.
2449          */
2450         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2451         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2452
2453         /* for replay, we should not overwrite the existing create guid */
2454         if (!oparms->replay) {
2455                 generate_random_uuid(buf->dcontext.CreateGuid);
2456                 memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2457         } else
2458                 memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16);
2459
2460         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2461         buf->Name[0] = 'D';
2462         buf->Name[1] = 'H';
2463         buf->Name[2] = '2';
2464         buf->Name[3] = 'Q';
2465         return buf;
2466 }
2467
2468 static struct create_durable_handle_reconnect_v2 *
2469 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2470 {
2471         struct create_durable_handle_reconnect_v2 *buf;
2472
2473         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2474                         GFP_KERNEL);
2475         if (!buf)
2476                 return NULL;
2477
2478         buf->ccontext.DataOffset =
2479                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2480                                      dcontext));
2481         buf->ccontext.DataLength =
2482                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2483         buf->ccontext.NameOffset =
2484                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2485                             Name));
2486         buf->ccontext.NameLength = cpu_to_le16(4);
2487
2488         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2489         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2490         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2491         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2492
2493         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2494         buf->Name[0] = 'D';
2495         buf->Name[1] = 'H';
2496         buf->Name[2] = '2';
2497         buf->Name[3] = 'C';
2498         return buf;
2499 }
2500
2501 static int
2502 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2503                     struct cifs_open_parms *oparms)
2504 {
2505         unsigned int num = *num_iovec;
2506
2507         iov[num].iov_base = create_durable_v2_buf(oparms);
2508         if (iov[num].iov_base == NULL)
2509                 return -ENOMEM;
2510         iov[num].iov_len = sizeof(struct create_durable_v2);
2511         *num_iovec = num + 1;
2512         return 0;
2513 }
2514
2515 static int
2516 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2517                     struct cifs_open_parms *oparms)
2518 {
2519         unsigned int num = *num_iovec;
2520
2521         /* indicate that we don't need to relock the file */
2522         oparms->reconnect = false;
2523
2524         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2525         if (iov[num].iov_base == NULL)
2526                 return -ENOMEM;
2527         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2528         *num_iovec = num + 1;
2529         return 0;
2530 }
2531
2532 static int
2533 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2534                     struct cifs_open_parms *oparms, bool use_persistent)
2535 {
2536         unsigned int num = *num_iovec;
2537
2538         if (use_persistent) {
2539                 if (oparms->reconnect)
2540                         return add_durable_reconnect_v2_context(iov, num_iovec,
2541                                                                 oparms);
2542                 else
2543                         return add_durable_v2_context(iov, num_iovec, oparms);
2544         }
2545
2546         if (oparms->reconnect) {
2547                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2548                 /* indicate that we don't need to relock the file */
2549                 oparms->reconnect = false;
2550         } else
2551                 iov[num].iov_base = create_durable_buf();
2552         if (iov[num].iov_base == NULL)
2553                 return -ENOMEM;
2554         iov[num].iov_len = sizeof(struct create_durable);
2555         *num_iovec = num + 1;
2556         return 0;
2557 }
2558
2559 /* See MS-SMB2 2.2.13.2.7 */
2560 static struct crt_twarp_ctxt *
2561 create_twarp_buf(__u64 timewarp)
2562 {
2563         struct crt_twarp_ctxt *buf;
2564
2565         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2566         if (!buf)
2567                 return NULL;
2568
2569         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2570                                         (struct crt_twarp_ctxt, Timestamp));
2571         buf->ccontext.DataLength = cpu_to_le32(8);
2572         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2573                                 (struct crt_twarp_ctxt, Name));
2574         buf->ccontext.NameLength = cpu_to_le16(4);
2575         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2576         buf->Name[0] = 'T';
2577         buf->Name[1] = 'W';
2578         buf->Name[2] = 'r';
2579         buf->Name[3] = 'p';
2580         buf->Timestamp = cpu_to_le64(timewarp);
2581         return buf;
2582 }
2583
2584 /* See MS-SMB2 2.2.13.2.7 */
2585 static int
2586 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2587 {
2588         unsigned int num = *num_iovec;
2589
2590         iov[num].iov_base = create_twarp_buf(timewarp);
2591         if (iov[num].iov_base == NULL)
2592                 return -ENOMEM;
2593         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2594         *num_iovec = num + 1;
2595         return 0;
2596 }
2597
2598 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2599 static void setup_owner_group_sids(char *buf)
2600 {
2601         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2602
2603         /* Populate the user ownership fields S-1-5-88-1 */
2604         sids->owner.Revision = 1;
2605         sids->owner.NumAuth = 3;
2606         sids->owner.Authority[5] = 5;
2607         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2608         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2609         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2610
2611         /* Populate the group ownership fields S-1-5-88-2 */
2612         sids->group.Revision = 1;
2613         sids->group.NumAuth = 3;
2614         sids->group.Authority[5] = 5;
2615         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2616         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2617         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2618
2619         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2620 }
2621
2622 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2623 static struct crt_sd_ctxt *
2624 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2625 {
2626         struct crt_sd_ctxt *buf;
2627         __u8 *ptr, *aclptr;
2628         unsigned int acelen, acl_size, ace_count;
2629         unsigned int owner_offset = 0;
2630         unsigned int group_offset = 0;
2631         struct smb3_acl acl = {};
2632
2633         *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct smb_ace) * 4), 8);
2634
2635         if (set_owner) {
2636                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2637                 *len += sizeof(struct owner_group_sids);
2638         }
2639
2640         buf = kzalloc(*len, GFP_KERNEL);
2641         if (buf == NULL)
2642                 return buf;
2643
2644         ptr = (__u8 *)&buf[1];
2645         if (set_owner) {
2646                 /* offset fields are from beginning of security descriptor not of create context */
2647                 owner_offset = ptr - (__u8 *)&buf->sd;
2648                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2649                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2650                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2651
2652                 setup_owner_group_sids(ptr);
2653                 ptr += sizeof(struct owner_group_sids);
2654         } else {
2655                 buf->sd.OffsetOwner = 0;
2656                 buf->sd.OffsetGroup = 0;
2657         }
2658
2659         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2660         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2661         buf->ccontext.NameLength = cpu_to_le16(4);
2662         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2663         buf->Name[0] = 'S';
2664         buf->Name[1] = 'e';
2665         buf->Name[2] = 'c';
2666         buf->Name[3] = 'D';
2667         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2668
2669         /*
2670          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2671          * and "DP" ie the DACL is present
2672          */
2673         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2674
2675         /* offset owner, group and Sbz1 and SACL are all zero */
2676         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2677         /* Ship the ACL for now. we will copy it into buf later. */
2678         aclptr = ptr;
2679         ptr += sizeof(struct smb3_acl);
2680
2681         /* create one ACE to hold the mode embedded in reserved special SID */
2682         acelen = setup_special_mode_ACE((struct smb_ace *)ptr, false, (__u64)mode);
2683         ptr += acelen;
2684         acl_size = acelen + sizeof(struct smb3_acl);
2685         ace_count = 1;
2686
2687         if (set_owner) {
2688                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2689                 acelen = setup_special_user_owner_ACE((struct smb_ace *)ptr);
2690                 ptr += acelen;
2691                 acl_size += acelen;
2692                 ace_count += 1;
2693         }
2694
2695         /* and one more ACE to allow access for authenticated users */
2696         acelen = setup_authusers_ACE((struct smb_ace *)ptr);
2697         ptr += acelen;
2698         acl_size += acelen;
2699         ace_count += 1;
2700
2701         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2702         acl.AclSize = cpu_to_le16(acl_size);
2703         acl.AceCount = cpu_to_le16(ace_count);
2704         /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2705         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2706
2707         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2708         *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2709
2710         return buf;
2711 }
2712
2713 static int
2714 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2715 {
2716         unsigned int num = *num_iovec;
2717         unsigned int len = 0;
2718
2719         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2720         if (iov[num].iov_base == NULL)
2721                 return -ENOMEM;
2722         iov[num].iov_len = len;
2723         *num_iovec = num + 1;
2724         return 0;
2725 }
2726
2727 static struct crt_query_id_ctxt *
2728 create_query_id_buf(void)
2729 {
2730         struct crt_query_id_ctxt *buf;
2731
2732         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2733         if (!buf)
2734                 return NULL;
2735
2736         buf->ccontext.DataOffset = cpu_to_le16(0);
2737         buf->ccontext.DataLength = cpu_to_le32(0);
2738         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2739                                 (struct crt_query_id_ctxt, Name));
2740         buf->ccontext.NameLength = cpu_to_le16(4);
2741         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2742         buf->Name[0] = 'Q';
2743         buf->Name[1] = 'F';
2744         buf->Name[2] = 'i';
2745         buf->Name[3] = 'd';
2746         return buf;
2747 }
2748
2749 /* See MS-SMB2 2.2.13.2.9 */
2750 static int
2751 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2752 {
2753         unsigned int num = *num_iovec;
2754
2755         iov[num].iov_base = create_query_id_buf();
2756         if (iov[num].iov_base == NULL)
2757                 return -ENOMEM;
2758         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2759         *num_iovec = num + 1;
2760         return 0;
2761 }
2762
2763 static void add_ea_context(struct cifs_open_parms *oparms,
2764                            struct kvec *rq_iov, unsigned int *num_iovs)
2765 {
2766         struct kvec *iov = oparms->ea_cctx;
2767
2768         if (iov && iov->iov_base && iov->iov_len) {
2769                 rq_iov[(*num_iovs)++] = *iov;
2770                 memset(iov, 0, sizeof(*iov));
2771         }
2772 }
2773
2774 static int
2775 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2776                             const char *treename, const __le16 *path)
2777 {
2778         int treename_len, path_len;
2779         struct nls_table *cp;
2780         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2781
2782         /*
2783          * skip leading "\\"
2784          */
2785         treename_len = strlen(treename);
2786         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2787                 return -EINVAL;
2788
2789         treename += 2;
2790         treename_len -= 2;
2791
2792         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2793
2794         /* make room for one path separator only if @path isn't empty */
2795         *out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2796
2797         /*
2798          * final path needs to be 8-byte aligned as specified in
2799          * MS-SMB2 2.2.13 SMB2 CREATE Request.
2800          */
2801         *out_size = round_up(*out_len * sizeof(__le16), 8);
2802         *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2803         if (!*out_path)
2804                 return -ENOMEM;
2805
2806         cp = load_nls_default();
2807         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2808
2809         /* Do not append the separator if the path is empty */
2810         if (path[0] != cpu_to_le16(0x0000)) {
2811                 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);
2812                 UniStrcat((wchar_t *)*out_path, (wchar_t *)path);
2813         }
2814
2815         unload_nls(cp);
2816
2817         return 0;
2818 }
2819
2820 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2821                                umode_t mode, struct cifs_tcon *tcon,
2822                                const char *full_path,
2823                                struct cifs_sb_info *cifs_sb)
2824 {
2825         struct smb_rqst rqst;
2826         struct smb2_create_req *req;
2827         struct smb2_create_rsp *rsp = NULL;
2828         struct cifs_ses *ses = tcon->ses;
2829         struct kvec iov[3]; /* make sure at least one for each open context */
2830         struct kvec rsp_iov = {NULL, 0};
2831         int resp_buftype;
2832         int uni_path_len;
2833         __le16 *copy_path = NULL;
2834         int copy_size;
2835         int rc = 0;
2836         unsigned int n_iov = 2;
2837         __u32 file_attributes = 0;
2838         char *pc_buf = NULL;
2839         int flags = 0;
2840         unsigned int total_len;
2841         __le16 *utf16_path = NULL;
2842         struct TCP_Server_Info *server;
2843         int retries = 0, cur_sleep = 1;
2844
2845 replay_again:
2846         /* reinitialize for possible replay */
2847         flags = 0;
2848         n_iov = 2;
2849         server = cifs_pick_channel(ses);
2850
2851         cifs_dbg(FYI, "mkdir\n");
2852
2853         /* resource #1: path allocation */
2854         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2855         if (!utf16_path)
2856                 return -ENOMEM;
2857
2858         if (!ses || !server) {
2859                 rc = -EIO;
2860                 goto err_free_path;
2861         }
2862
2863         /* resource #2: request */
2864         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2865                                  (void **) &req, &total_len);
2866         if (rc)
2867                 goto err_free_path;
2868
2869
2870         if (smb3_encryption_required(tcon))
2871                 flags |= CIFS_TRANSFORM_REQ;
2872
2873         req->ImpersonationLevel = IL_IMPERSONATION;
2874         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2875         /* File attributes ignored on open (used in create though) */
2876         req->FileAttributes = cpu_to_le32(file_attributes);
2877         req->ShareAccess = FILE_SHARE_ALL_LE;
2878         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2879         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2880
2881         iov[0].iov_base = (char *)req;
2882         /* -1 since last byte is buf[0] which is sent below (path) */
2883         iov[0].iov_len = total_len - 1;
2884
2885         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2886
2887         /* [MS-SMB2] 2.2.13 NameOffset:
2888          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2889          * the SMB2 header, the file name includes a prefix that will
2890          * be processed during DFS name normalization as specified in
2891          * section 3.3.5.9. Otherwise, the file name is relative to
2892          * the share that is identified by the TreeId in the SMB2
2893          * header.
2894          */
2895         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2896                 int name_len;
2897
2898                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2899                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2900                                                  &name_len,
2901                                                  tcon->tree_name, utf16_path);
2902                 if (rc)
2903                         goto err_free_req;
2904
2905                 req->NameLength = cpu_to_le16(name_len * 2);
2906                 uni_path_len = copy_size;
2907                 /* free before overwriting resource */
2908                 kfree(utf16_path);
2909                 utf16_path = copy_path;
2910         } else {
2911                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2912                 /* MUST set path len (NameLength) to 0 opening root of share */
2913                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2914                 if (uni_path_len % 8 != 0) {
2915                         copy_size = roundup(uni_path_len, 8);
2916                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2917                         if (!copy_path) {
2918                                 rc = -ENOMEM;
2919                                 goto err_free_req;
2920                         }
2921                         memcpy((char *)copy_path, (const char *)utf16_path,
2922                                uni_path_len);
2923                         uni_path_len = copy_size;
2924                         /* free before overwriting resource */
2925                         kfree(utf16_path);
2926                         utf16_path = copy_path;
2927                 }
2928         }
2929
2930         iov[1].iov_len = uni_path_len;
2931         iov[1].iov_base = utf16_path;
2932         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2933
2934         if (tcon->posix_extensions) {
2935                 /* resource #3: posix buf */
2936                 rc = add_posix_context(iov, &n_iov, mode);
2937                 if (rc)
2938                         goto err_free_req;
2939                 req->CreateContextsOffset = cpu_to_le32(
2940                         sizeof(struct smb2_create_req) +
2941                         iov[1].iov_len);
2942                 pc_buf = iov[n_iov-1].iov_base;
2943         }
2944
2945
2946         memset(&rqst, 0, sizeof(struct smb_rqst));
2947         rqst.rq_iov = iov;
2948         rqst.rq_nvec = n_iov;
2949
2950         /* no need to inc num_remote_opens because we close it just below */
2951         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
2952                                     FILE_WRITE_ATTRIBUTES);
2953
2954         if (retries)
2955                 smb2_set_replay(server, &rqst);
2956
2957         /* resource #4: response buffer */
2958         rc = cifs_send_recv(xid, ses, server,
2959                             &rqst, &resp_buftype, flags, &rsp_iov);
2960         if (rc) {
2961                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2962                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2963                                            CREATE_NOT_FILE,
2964                                            FILE_WRITE_ATTRIBUTES, rc);
2965                 goto err_free_rsp_buf;
2966         }
2967
2968         /*
2969          * Although unlikely to be possible for rsp to be null and rc not set,
2970          * adding check below is slightly safer long term (and quiets Coverity
2971          * warning)
2972          */
2973         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2974         if (rsp == NULL) {
2975                 rc = -EIO;
2976                 kfree(pc_buf);
2977                 goto err_free_req;
2978         }
2979
2980         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2981                                     CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2982
2983         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2984
2985         /* Eventually save off posix specific response info and timestamps */
2986
2987 err_free_rsp_buf:
2988         free_rsp_buf(resp_buftype, rsp);
2989         kfree(pc_buf);
2990 err_free_req:
2991         cifs_small_buf_release(req);
2992 err_free_path:
2993         kfree(utf16_path);
2994
2995         if (is_replayable_error(rc) &&
2996             smb2_should_replay(tcon, &retries, &cur_sleep))
2997                 goto replay_again;
2998
2999         return rc;
3000 }
3001
3002 int
3003 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3004                struct smb_rqst *rqst, __u8 *oplock,
3005                struct cifs_open_parms *oparms, __le16 *path)
3006 {
3007         struct smb2_create_req *req;
3008         unsigned int n_iov = 2;
3009         __u32 file_attributes = 0;
3010         int copy_size;
3011         int uni_path_len;
3012         unsigned int total_len;
3013         struct kvec *iov = rqst->rq_iov;
3014         __le16 *copy_path;
3015         int rc;
3016
3017         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
3018                                  (void **) &req, &total_len);
3019         if (rc)
3020                 return rc;
3021
3022         iov[0].iov_base = (char *)req;
3023         /* -1 since last byte is buf[0] which is sent below (path) */
3024         iov[0].iov_len = total_len - 1;
3025
3026         if (oparms->create_options & CREATE_OPTION_READONLY)
3027                 file_attributes |= ATTR_READONLY;
3028         if (oparms->create_options & CREATE_OPTION_SPECIAL)
3029                 file_attributes |= ATTR_SYSTEM;
3030
3031         req->ImpersonationLevel = IL_IMPERSONATION;
3032         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
3033         /* File attributes ignored on open (used in create though) */
3034         req->FileAttributes = cpu_to_le32(file_attributes);
3035         req->ShareAccess = FILE_SHARE_ALL_LE;
3036
3037         req->CreateDisposition = cpu_to_le32(oparms->disposition);
3038         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
3039         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
3040
3041         /* [MS-SMB2] 2.2.13 NameOffset:
3042          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
3043          * the SMB2 header, the file name includes a prefix that will
3044          * be processed during DFS name normalization as specified in
3045          * section 3.3.5.9. Otherwise, the file name is relative to
3046          * the share that is identified by the TreeId in the SMB2
3047          * header.
3048          */
3049         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
3050                 int name_len;
3051
3052                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
3053                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
3054                                                  &name_len,
3055                                                  tcon->tree_name, path);
3056                 if (rc)
3057                         return rc;
3058                 req->NameLength = cpu_to_le16(name_len * 2);
3059                 uni_path_len = copy_size;
3060                 path = copy_path;
3061         } else {
3062                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
3063                 /* MUST set path len (NameLength) to 0 opening root of share */
3064                 req->NameLength = cpu_to_le16(uni_path_len - 2);
3065                 copy_size = round_up(uni_path_len, 8);
3066                 copy_path = kzalloc(copy_size, GFP_KERNEL);
3067                 if (!copy_path)
3068                         return -ENOMEM;
3069                 memcpy((char *)copy_path, (const char *)path,
3070                        uni_path_len);
3071                 uni_path_len = copy_size;
3072                 path = copy_path;
3073         }
3074
3075         iov[1].iov_len = uni_path_len;
3076         iov[1].iov_base = path;
3077
3078         if ((!server->oplocks) || (tcon->no_lease))
3079                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
3080
3081         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
3082             *oplock == SMB2_OPLOCK_LEVEL_NONE)
3083                 req->RequestedOplockLevel = *oplock;
3084         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
3085                   (oparms->create_options & CREATE_NOT_FILE))
3086                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
3087         else {
3088                 rc = add_lease_context(server, req, iov, &n_iov,
3089                                        oparms->fid->lease_key, oplock);
3090                 if (rc)
3091                         return rc;
3092         }
3093
3094         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3095                 rc = add_durable_context(iov, &n_iov, oparms,
3096                                         tcon->use_persistent);
3097                 if (rc)
3098                         return rc;
3099         }
3100
3101         if (tcon->posix_extensions) {
3102                 rc = add_posix_context(iov, &n_iov, oparms->mode);
3103                 if (rc)
3104                         return rc;
3105         }
3106
3107         if (tcon->snapshot_time) {
3108                 cifs_dbg(FYI, "adding snapshot context\n");
3109                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
3110                 if (rc)
3111                         return rc;
3112         }
3113
3114         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
3115                 bool set_mode;
3116                 bool set_owner;
3117
3118                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
3119                     (oparms->mode != ACL_NO_MODE))
3120                         set_mode = true;
3121                 else {
3122                         set_mode = false;
3123                         oparms->mode = ACL_NO_MODE;
3124                 }
3125
3126                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
3127                         set_owner = true;
3128                 else
3129                         set_owner = false;
3130
3131                 if (set_owner | set_mode) {
3132                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
3133                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
3134                         if (rc)
3135                                 return rc;
3136                 }
3137         }
3138
3139         add_query_id_context(iov, &n_iov);
3140         add_ea_context(oparms, iov, &n_iov);
3141
3142         if (n_iov > 2) {
3143                 /*
3144                  * We have create contexts behind iov[1] (the file
3145                  * name), point at them from the main create request
3146                  */
3147                 req->CreateContextsOffset = cpu_to_le32(
3148                         sizeof(struct smb2_create_req) +
3149                         iov[1].iov_len);
3150                 req->CreateContextsLength = 0;
3151
3152                 for (unsigned int i = 2; i < (n_iov-1); i++) {
3153                         struct kvec *v = &iov[i];
3154                         size_t len = v->iov_len;
3155                         struct create_context *cctx =
3156                                 (struct create_context *)v->iov_base;
3157
3158                         cctx->Next = cpu_to_le32(len);
3159                         le32_add_cpu(&req->CreateContextsLength, len);
3160                 }
3161                 le32_add_cpu(&req->CreateContextsLength,
3162                              iov[n_iov-1].iov_len);
3163         }
3164
3165         rqst->rq_nvec = n_iov;
3166         return 0;
3167 }
3168
3169 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
3170  * All other vectors are freed by kfree().
3171  */
3172 void
3173 SMB2_open_free(struct smb_rqst *rqst)
3174 {
3175         int i;
3176
3177         if (rqst && rqst->rq_iov) {
3178                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
3179                 for (i = 1; i < rqst->rq_nvec; i++)
3180                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3181                                 kfree(rqst->rq_iov[i].iov_base);
3182         }
3183 }
3184
3185 int
3186 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
3187           __u8 *oplock, struct smb2_file_all_info *buf,
3188           struct create_posix_rsp *posix,
3189           struct kvec *err_iov, int *buftype)
3190 {
3191         struct smb_rqst rqst;
3192         struct smb2_create_rsp *rsp = NULL;
3193         struct cifs_tcon *tcon = oparms->tcon;
3194         struct cifs_ses *ses = tcon->ses;
3195         struct TCP_Server_Info *server;
3196         struct kvec iov[SMB2_CREATE_IOV_SIZE];
3197         struct kvec rsp_iov = {NULL, 0};
3198         int resp_buftype = CIFS_NO_BUFFER;
3199         int rc = 0;
3200         int flags = 0;
3201         int retries = 0, cur_sleep = 1;
3202
3203 replay_again:
3204         /* reinitialize for possible replay */
3205         flags = 0;
3206         server = cifs_pick_channel(ses);
3207         oparms->replay = !!(retries);
3208
3209         cifs_dbg(FYI, "create/open\n");
3210         if (!ses || !server)
3211                 return -EIO;
3212
3213         if (smb3_encryption_required(tcon))
3214                 flags |= CIFS_TRANSFORM_REQ;
3215
3216         memset(&rqst, 0, sizeof(struct smb_rqst));
3217         memset(&iov, 0, sizeof(iov));
3218         rqst.rq_iov = iov;
3219         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
3220
3221         rc = SMB2_open_init(tcon, server,
3222                             &rqst, oplock, oparms, path);
3223         if (rc)
3224                 goto creat_exit;
3225
3226         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
3227                 oparms->create_options, oparms->desired_access);
3228
3229         if (retries)
3230                 smb2_set_replay(server, &rqst);
3231
3232         rc = cifs_send_recv(xid, ses, server,
3233                             &rqst, &resp_buftype, flags,
3234                             &rsp_iov);
3235         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3236
3237         if (rc != 0) {
3238                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3239                 if (err_iov && rsp) {
3240                         *err_iov = rsp_iov;
3241                         *buftype = resp_buftype;
3242                         resp_buftype = CIFS_NO_BUFFER;
3243                         rsp = NULL;
3244                 }
3245                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3246                                     oparms->create_options, oparms->desired_access, rc);
3247                 if (rc == -EREMCHG) {
3248                         pr_warn_once("server share %s deleted\n",
3249                                      tcon->tree_name);
3250                         tcon->need_reconnect = true;
3251                 }
3252                 goto creat_exit;
3253         } else if (rsp == NULL) /* unlikely to happen, but safer to check */
3254                 goto creat_exit;
3255         else
3256                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3257                                      oparms->create_options, oparms->desired_access);
3258
3259         atomic_inc(&tcon->num_remote_opens);
3260         oparms->fid->persistent_fid = rsp->PersistentFileId;
3261         oparms->fid->volatile_fid = rsp->VolatileFileId;
3262         oparms->fid->access = oparms->desired_access;
3263 #ifdef CONFIG_CIFS_DEBUG2
3264         oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3265 #endif /* CIFS_DEBUG2 */
3266
3267         if (buf) {
3268                 buf->CreationTime = rsp->CreationTime;
3269                 buf->LastAccessTime = rsp->LastAccessTime;
3270                 buf->LastWriteTime = rsp->LastWriteTime;
3271                 buf->ChangeTime = rsp->ChangeTime;
3272                 buf->AllocationSize = rsp->AllocationSize;
3273                 buf->EndOfFile = rsp->EndofFile;
3274                 buf->Attributes = rsp->FileAttributes;
3275                 buf->NumberOfLinks = cpu_to_le32(1);
3276                 buf->DeletePending = 0;
3277         }
3278
3279
3280         rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
3281                                  oparms->fid->lease_key, oplock, buf, posix);
3282 creat_exit:
3283         SMB2_open_free(&rqst);
3284         free_rsp_buf(resp_buftype, rsp);
3285
3286         if (is_replayable_error(rc) &&
3287             smb2_should_replay(tcon, &retries, &cur_sleep))
3288                 goto replay_again;
3289
3290         return rc;
3291 }
3292
3293 int
3294 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3295                 struct smb_rqst *rqst,
3296                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
3297                 char *in_data, u32 indatalen,
3298                 __u32 max_response_size)
3299 {
3300         struct smb2_ioctl_req *req;
3301         struct kvec *iov = rqst->rq_iov;
3302         unsigned int total_len;
3303         int rc;
3304         char *in_data_buf;
3305
3306         rc = smb2_ioctl_req_init(opcode, tcon, server,
3307                                  (void **) &req, &total_len);
3308         if (rc)
3309                 return rc;
3310
3311         if (indatalen) {
3312                 /*
3313                  * indatalen is usually small at a couple of bytes max, so
3314                  * just allocate through generic pool
3315                  */
3316                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3317                 if (!in_data_buf) {
3318                         cifs_small_buf_release(req);
3319                         return -ENOMEM;
3320                 }
3321         }
3322
3323         req->CtlCode = cpu_to_le32(opcode);
3324         req->PersistentFileId = persistent_fid;
3325         req->VolatileFileId = volatile_fid;
3326
3327         iov[0].iov_base = (char *)req;
3328         /*
3329          * If no input data, the size of ioctl struct in
3330          * protocol spec still includes a 1 byte data buffer,
3331          * but if input data passed to ioctl, we do not
3332          * want to double count this, so we do not send
3333          * the dummy one byte of data in iovec[0] if sending
3334          * input data (in iovec[1]).
3335          */
3336         if (indatalen) {
3337                 req->InputCount = cpu_to_le32(indatalen);
3338                 /* do not set InputOffset if no input data */
3339                 req->InputOffset =
3340                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3341                 rqst->rq_nvec = 2;
3342                 iov[0].iov_len = total_len - 1;
3343                 iov[1].iov_base = in_data_buf;
3344                 iov[1].iov_len = indatalen;
3345         } else {
3346                 rqst->rq_nvec = 1;
3347                 iov[0].iov_len = total_len;
3348         }
3349
3350         req->OutputOffset = 0;
3351         req->OutputCount = 0; /* MBZ */
3352
3353         /*
3354          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3355          * We Could increase default MaxOutputResponse, but that could require
3356          * more credits. Windows typically sets this smaller, but for some
3357          * ioctls it may be useful to allow server to send more. No point
3358          * limiting what the server can send as long as fits in one credit
3359          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3360          * to increase this limit up in the future.
3361          * Note that for snapshot queries that servers like Azure expect that
3362          * the first query be minimal size (and just used to get the number/size
3363          * of previous versions) so response size must be specified as EXACTLY
3364          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3365          * of eight bytes.  Currently that is the only case where we set max
3366          * response size smaller.
3367          */
3368         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3369         req->hdr.CreditCharge =
3370                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3371                                          SMB2_MAX_BUFFER_SIZE));
3372         /* always an FSCTL (for now) */
3373         req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3374
3375         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3376         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3377                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3378
3379         return 0;
3380 }
3381
3382 void
3383 SMB2_ioctl_free(struct smb_rqst *rqst)
3384 {
3385         int i;
3386
3387         if (rqst && rqst->rq_iov) {
3388                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3389                 for (i = 1; i < rqst->rq_nvec; i++)
3390                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3391                                 kfree(rqst->rq_iov[i].iov_base);
3392         }
3393 }
3394
3395
3396 /*
3397  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3398  */
3399 int
3400 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3401            u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3402            u32 max_out_data_len, char **out_data,
3403            u32 *plen /* returned data len */)
3404 {
3405         struct smb_rqst rqst;
3406         struct smb2_ioctl_rsp *rsp = NULL;
3407         struct cifs_ses *ses;
3408         struct TCP_Server_Info *server;
3409         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3410         struct kvec rsp_iov = {NULL, 0};
3411         int resp_buftype = CIFS_NO_BUFFER;
3412         int rc = 0;
3413         int flags = 0;
3414         int retries = 0, cur_sleep = 1;
3415
3416         if (!tcon)
3417                 return -EIO;
3418
3419         ses = tcon->ses;
3420         if (!ses)
3421                 return -EIO;
3422
3423 replay_again:
3424         /* reinitialize for possible replay */
3425         flags = 0;
3426         server = cifs_pick_channel(ses);
3427
3428         if (!server)
3429                 return -EIO;
3430
3431         cifs_dbg(FYI, "SMB2 IOCTL\n");
3432
3433         if (out_data != NULL)
3434                 *out_data = NULL;
3435
3436         /* zero out returned data len, in case of error */
3437         if (plen)
3438                 *plen = 0;
3439
3440         if (smb3_encryption_required(tcon))
3441                 flags |= CIFS_TRANSFORM_REQ;
3442
3443         memset(&rqst, 0, sizeof(struct smb_rqst));
3444         memset(&iov, 0, sizeof(iov));
3445         rqst.rq_iov = iov;
3446         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3447
3448         rc = SMB2_ioctl_init(tcon, server,
3449                              &rqst, persistent_fid, volatile_fid, opcode,
3450                              in_data, indatalen, max_out_data_len);
3451         if (rc)
3452                 goto ioctl_exit;
3453
3454         if (retries)
3455                 smb2_set_replay(server, &rqst);
3456
3457         rc = cifs_send_recv(xid, ses, server,
3458                             &rqst, &resp_buftype, flags,
3459                             &rsp_iov);
3460         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3461
3462         if (rc != 0)
3463                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3464                                 ses->Suid, 0, opcode, rc);
3465
3466         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3467                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3468                 goto ioctl_exit;
3469         } else if (rc == -EINVAL) {
3470                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3471                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3472                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3473                         goto ioctl_exit;
3474                 }
3475         } else if (rc == -E2BIG) {
3476                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3477                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3478                         goto ioctl_exit;
3479                 }
3480         }
3481
3482         /* check if caller wants to look at return data or just return rc */
3483         if ((plen == NULL) || (out_data == NULL))
3484                 goto ioctl_exit;
3485
3486         /*
3487          * Although unlikely to be possible for rsp to be null and rc not set,
3488          * adding check below is slightly safer long term (and quiets Coverity
3489          * warning)
3490          */
3491         if (rsp == NULL) {
3492                 rc = -EIO;
3493                 goto ioctl_exit;
3494         }
3495
3496         *plen = le32_to_cpu(rsp->OutputCount);
3497
3498         /* We check for obvious errors in the output buffer length and offset */
3499         if (*plen == 0)
3500                 goto ioctl_exit; /* server returned no data */
3501         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3502                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3503                 *plen = 0;
3504                 rc = -EIO;
3505                 goto ioctl_exit;
3506         }
3507
3508         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3509                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3510                         le32_to_cpu(rsp->OutputOffset));
3511                 *plen = 0;
3512                 rc = -EIO;
3513                 goto ioctl_exit;
3514         }
3515
3516         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3517                             *plen, GFP_KERNEL);
3518         if (*out_data == NULL) {
3519                 rc = -ENOMEM;
3520                 goto ioctl_exit;
3521         }
3522
3523 ioctl_exit:
3524         SMB2_ioctl_free(&rqst);
3525         free_rsp_buf(resp_buftype, rsp);
3526
3527         if (is_replayable_error(rc) &&
3528             smb2_should_replay(tcon, &retries, &cur_sleep))
3529                 goto replay_again;
3530
3531         return rc;
3532 }
3533
3534 /*
3535  *   Individual callers to ioctl worker function follow
3536  */
3537
3538 int
3539 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3540                      u64 persistent_fid, u64 volatile_fid)
3541 {
3542         int rc;
3543         struct  compress_ioctl fsctl_input;
3544         char *ret_data = NULL;
3545
3546         fsctl_input.CompressionState =
3547                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3548
3549         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3550                         FSCTL_SET_COMPRESSION,
3551                         (char *)&fsctl_input /* data input */,
3552                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3553                         &ret_data /* out data */, NULL);
3554
3555         cifs_dbg(FYI, "set compression rc %d\n", rc);
3556
3557         return rc;
3558 }
3559
3560 int
3561 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3562                 struct smb_rqst *rqst,
3563                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3564 {
3565         struct smb2_close_req *req;
3566         struct kvec *iov = rqst->rq_iov;
3567         unsigned int total_len;
3568         int rc;
3569
3570         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3571                                  (void **) &req, &total_len);
3572         if (rc)
3573                 return rc;
3574
3575         req->PersistentFileId = persistent_fid;
3576         req->VolatileFileId = volatile_fid;
3577         if (query_attrs)
3578                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3579         else
3580                 req->Flags = 0;
3581         iov[0].iov_base = (char *)req;
3582         iov[0].iov_len = total_len;
3583
3584         return 0;
3585 }
3586
3587 void
3588 SMB2_close_free(struct smb_rqst *rqst)
3589 {
3590         if (rqst && rqst->rq_iov)
3591                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3592 }
3593
3594 int
3595 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3596              u64 persistent_fid, u64 volatile_fid,
3597              struct smb2_file_network_open_info *pbuf)
3598 {
3599         struct smb_rqst rqst;
3600         struct smb2_close_rsp *rsp = NULL;
3601         struct cifs_ses *ses = tcon->ses;
3602         struct TCP_Server_Info *server;
3603         struct kvec iov[1];
3604         struct kvec rsp_iov;
3605         int resp_buftype = CIFS_NO_BUFFER;
3606         int rc = 0;
3607         int flags = 0;
3608         bool query_attrs = false;
3609         int retries = 0, cur_sleep = 1;
3610
3611 replay_again:
3612         /* reinitialize for possible replay */
3613         flags = 0;
3614         query_attrs = false;
3615         server = cifs_pick_channel(ses);
3616
3617         cifs_dbg(FYI, "Close\n");
3618
3619         if (!ses || !server)
3620                 return -EIO;
3621
3622         if (smb3_encryption_required(tcon))
3623                 flags |= CIFS_TRANSFORM_REQ;
3624
3625         memset(&rqst, 0, sizeof(struct smb_rqst));
3626         memset(&iov, 0, sizeof(iov));
3627         rqst.rq_iov = iov;
3628         rqst.rq_nvec = 1;
3629
3630         /* check if need to ask server to return timestamps in close response */
3631         if (pbuf)
3632                 query_attrs = true;
3633
3634         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3635         rc = SMB2_close_init(tcon, server,
3636                              &rqst, persistent_fid, volatile_fid,
3637                              query_attrs);
3638         if (rc)
3639                 goto close_exit;
3640
3641         if (retries)
3642                 smb2_set_replay(server, &rqst);
3643
3644         rc = cifs_send_recv(xid, ses, server,
3645                             &rqst, &resp_buftype, flags, &rsp_iov);
3646         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3647
3648         if (rc != 0) {
3649                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3650                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3651                                      rc);
3652                 goto close_exit;
3653         } else {
3654                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3655                                       ses->Suid);
3656                 if (pbuf)
3657                         memcpy(&pbuf->network_open_info,
3658                                &rsp->network_open_info,
3659                                sizeof(pbuf->network_open_info));
3660                 atomic_dec(&tcon->num_remote_opens);
3661         }
3662
3663 close_exit:
3664         SMB2_close_free(&rqst);
3665         free_rsp_buf(resp_buftype, rsp);
3666
3667         /* retry close in a worker thread if this one is interrupted */
3668         if (is_interrupt_error(rc)) {
3669                 int tmp_rc;
3670
3671                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3672                                                      volatile_fid);
3673                 if (tmp_rc)
3674                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3675                                  persistent_fid, tmp_rc);
3676         }
3677
3678         if (is_replayable_error(rc) &&
3679             smb2_should_replay(tcon, &retries, &cur_sleep))
3680                 goto replay_again;
3681
3682         return rc;
3683 }
3684
3685 int
3686 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3687                 u64 persistent_fid, u64 volatile_fid)
3688 {
3689         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3690 }
3691
3692 int
3693 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3694                   struct kvec *iov, unsigned int min_buf_size)
3695 {
3696         unsigned int smb_len = iov->iov_len;
3697         char *end_of_smb = smb_len + (char *)iov->iov_base;
3698         char *begin_of_buf = offset + (char *)iov->iov_base;
3699         char *end_of_buf = begin_of_buf + buffer_length;
3700
3701
3702         if (buffer_length < min_buf_size) {
3703                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3704                          buffer_length, min_buf_size);
3705                 return -EINVAL;
3706         }
3707
3708         /* check if beyond RFC1001 maximum length */
3709         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3710                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3711                          buffer_length, smb_len);
3712                 return -EINVAL;
3713         }
3714
3715         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3716                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3717                 return -EINVAL;
3718         }
3719
3720         return 0;
3721 }
3722
3723 /*
3724  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3725  * Caller must free buffer.
3726  */
3727 int
3728 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3729                            struct kvec *iov, unsigned int minbufsize,
3730                            char *data)
3731 {
3732         char *begin_of_buf = offset + (char *)iov->iov_base;
3733         int rc;
3734
3735         if (!data)
3736                 return -EINVAL;
3737
3738         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3739         if (rc)
3740                 return rc;
3741
3742         memcpy(data, begin_of_buf, minbufsize);
3743
3744         return 0;
3745 }
3746
3747 int
3748 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3749                      struct smb_rqst *rqst,
3750                      u64 persistent_fid, u64 volatile_fid,
3751                      u8 info_class, u8 info_type, u32 additional_info,
3752                      size_t output_len, size_t input_len, void *input)
3753 {
3754         struct smb2_query_info_req *req;
3755         struct kvec *iov = rqst->rq_iov;
3756         unsigned int total_len;
3757         size_t len;
3758         int rc;
3759
3760         if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
3761                      len > CIFSMaxBufSize))
3762                 return -EINVAL;
3763
3764         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3765                                  (void **) &req, &total_len);
3766         if (rc)
3767                 return rc;
3768
3769         req->InfoType = info_type;
3770         req->FileInfoClass = info_class;
3771         req->PersistentFileId = persistent_fid;
3772         req->VolatileFileId = volatile_fid;
3773         req->AdditionalInformation = cpu_to_le32(additional_info);
3774
3775         req->OutputBufferLength = cpu_to_le32(output_len);
3776         if (input_len) {
3777                 req->InputBufferLength = cpu_to_le32(input_len);
3778                 /* total_len for smb query request never close to le16 max */
3779                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3780                 memcpy(req->Buffer, input, input_len);
3781         }
3782
3783         iov[0].iov_base = (char *)req;
3784         /* 1 for Buffer */
3785         iov[0].iov_len = len;
3786         return 0;
3787 }
3788
3789 void
3790 SMB2_query_info_free(struct smb_rqst *rqst)
3791 {
3792         if (rqst && rqst->rq_iov)
3793                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3794 }
3795
3796 static int
3797 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3798            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3799            u32 additional_info, size_t output_len, size_t min_len, void **data,
3800                 u32 *dlen)
3801 {
3802         struct smb_rqst rqst;
3803         struct smb2_query_info_rsp *rsp = NULL;
3804         struct kvec iov[1];
3805         struct kvec rsp_iov;
3806         int rc = 0;
3807         int resp_buftype = CIFS_NO_BUFFER;
3808         struct cifs_ses *ses = tcon->ses;
3809         struct TCP_Server_Info *server;
3810         int flags = 0;
3811         bool allocated = false;
3812         int retries = 0, cur_sleep = 1;
3813
3814         cifs_dbg(FYI, "Query Info\n");
3815
3816         if (!ses)
3817                 return -EIO;
3818
3819 replay_again:
3820         /* reinitialize for possible replay */
3821         flags = 0;
3822         allocated = false;
3823         server = cifs_pick_channel(ses);
3824
3825         if (!server)
3826                 return -EIO;
3827
3828         if (smb3_encryption_required(tcon))
3829                 flags |= CIFS_TRANSFORM_REQ;
3830
3831         memset(&rqst, 0, sizeof(struct smb_rqst));
3832         memset(&iov, 0, sizeof(iov));
3833         rqst.rq_iov = iov;
3834         rqst.rq_nvec = 1;
3835
3836         rc = SMB2_query_info_init(tcon, server,
3837                                   &rqst, persistent_fid, volatile_fid,
3838                                   info_class, info_type, additional_info,
3839                                   output_len, 0, NULL);
3840         if (rc)
3841                 goto qinf_exit;
3842
3843         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3844                                     ses->Suid, info_class, (__u32)info_type);
3845
3846         if (retries)
3847                 smb2_set_replay(server, &rqst);
3848
3849         rc = cifs_send_recv(xid, ses, server,
3850                             &rqst, &resp_buftype, flags, &rsp_iov);
3851         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3852
3853         if (rc) {
3854                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3855                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3856                                 ses->Suid, info_class, (__u32)info_type, rc);
3857                 goto qinf_exit;
3858         }
3859
3860         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3861                                 ses->Suid, info_class, (__u32)info_type);
3862
3863         if (dlen) {
3864                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3865                 if (!*data) {
3866                         *data = kmalloc(*dlen, GFP_KERNEL);
3867                         if (!*data) {
3868                                 cifs_tcon_dbg(VFS,
3869                                         "Error %d allocating memory for acl\n",
3870                                         rc);
3871                                 *dlen = 0;
3872                                 rc = -ENOMEM;
3873                                 goto qinf_exit;
3874                         }
3875                         allocated = true;
3876                 }
3877         }
3878
3879         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3880                                         le32_to_cpu(rsp->OutputBufferLength),
3881                                         &rsp_iov, dlen ? *dlen : min_len, *data);
3882         if (rc && allocated) {
3883                 kfree(*data);
3884                 *data = NULL;
3885                 *dlen = 0;
3886         }
3887
3888 qinf_exit:
3889         SMB2_query_info_free(&rqst);
3890         free_rsp_buf(resp_buftype, rsp);
3891
3892         if (is_replayable_error(rc) &&
3893             smb2_should_replay(tcon, &retries, &cur_sleep))
3894                 goto replay_again;
3895
3896         return rc;
3897 }
3898
3899 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3900         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3901 {
3902         return query_info(xid, tcon, persistent_fid, volatile_fid,
3903                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3904                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3905                           sizeof(struct smb2_file_all_info), (void **)&data,
3906                           NULL);
3907 }
3908
3909 #if 0
3910 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3911 int
3912 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3913                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3914 {
3915         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3916                         (sizeof(struct smb_sid) * 2) + (PATH_MAX * 2);
3917         *plen = 0;
3918
3919         return query_info(xid, tcon, persistent_fid, volatile_fid,
3920                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3921                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3922         /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3923 }
3924 #endif
3925
3926 int
3927 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3928                u64 persistent_fid, u64 volatile_fid,
3929                void **data, u32 *plen, u32 extra_info)
3930 {
3931         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3932                                 extra_info;
3933         *plen = 0;
3934
3935         return query_info(xid, tcon, persistent_fid, volatile_fid,
3936                           0, SMB2_O_INFO_SECURITY, additional_info,
3937                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3938 }
3939
3940 int
3941 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3942                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3943 {
3944         return query_info(xid, tcon, persistent_fid, volatile_fid,
3945                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3946                           sizeof(struct smb2_file_internal_info),
3947                           sizeof(struct smb2_file_internal_info),
3948                           (void **)&uniqueid, NULL);
3949 }
3950
3951 /*
3952  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3953  * See MS-SMB2 2.2.35 and 2.2.36
3954  */
3955
3956 static int
3957 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3958                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3959                  u64 persistent_fid, u64 volatile_fid,
3960                  u32 completion_filter, bool watch_tree)
3961 {
3962         struct smb2_change_notify_req *req;
3963         struct kvec *iov = rqst->rq_iov;
3964         unsigned int total_len;
3965         int rc;
3966
3967         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3968                                  (void **) &req, &total_len);
3969         if (rc)
3970                 return rc;
3971
3972         req->PersistentFileId = persistent_fid;
3973         req->VolatileFileId = volatile_fid;
3974         /* See note 354 of MS-SMB2, 64K max */
3975         req->OutputBufferLength =
3976                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3977         req->CompletionFilter = cpu_to_le32(completion_filter);
3978         if (watch_tree)
3979                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3980         else
3981                 req->Flags = 0;
3982
3983         iov[0].iov_base = (char *)req;
3984         iov[0].iov_len = total_len;
3985
3986         return 0;
3987 }
3988
3989 int
3990 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3991                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3992                 u32 completion_filter, u32 max_out_data_len, char **out_data,
3993                 u32 *plen /* returned data len */)
3994 {
3995         struct cifs_ses *ses = tcon->ses;
3996         struct TCP_Server_Info *server;
3997         struct smb_rqst rqst;
3998         struct smb2_change_notify_rsp *smb_rsp;
3999         struct kvec iov[1];
4000         struct kvec rsp_iov = {NULL, 0};
4001         int resp_buftype = CIFS_NO_BUFFER;
4002         int flags = 0;
4003         int rc = 0;
4004         int retries = 0, cur_sleep = 1;
4005
4006 replay_again:
4007         /* reinitialize for possible replay */
4008         flags = 0;
4009         server = cifs_pick_channel(ses);
4010
4011         cifs_dbg(FYI, "change notify\n");
4012         if (!ses || !server)
4013                 return -EIO;
4014
4015         if (smb3_encryption_required(tcon))
4016                 flags |= CIFS_TRANSFORM_REQ;
4017
4018         memset(&rqst, 0, sizeof(struct smb_rqst));
4019         memset(&iov, 0, sizeof(iov));
4020         if (plen)
4021                 *plen = 0;
4022
4023         rqst.rq_iov = iov;
4024         rqst.rq_nvec = 1;
4025
4026         rc = SMB2_notify_init(xid, &rqst, tcon, server,
4027                               persistent_fid, volatile_fid,
4028                               completion_filter, watch_tree);
4029         if (rc)
4030                 goto cnotify_exit;
4031
4032         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
4033                                 (u8)watch_tree, completion_filter);
4034
4035         if (retries)
4036                 smb2_set_replay(server, &rqst);
4037
4038         rc = cifs_send_recv(xid, ses, server,
4039                             &rqst, &resp_buftype, flags, &rsp_iov);
4040
4041         if (rc != 0) {
4042                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
4043                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
4044                                 (u8)watch_tree, completion_filter, rc);
4045         } else {
4046                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
4047                         ses->Suid, (u8)watch_tree, completion_filter);
4048                 /* validate that notify information is plausible */
4049                 if ((rsp_iov.iov_base == NULL) ||
4050                     (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
4051                         goto cnotify_exit;
4052
4053                 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
4054
4055                 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
4056                                 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
4057                                 sizeof(struct file_notify_information));
4058
4059                 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
4060                                 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
4061                 if (*out_data == NULL) {
4062                         rc = -ENOMEM;
4063                         goto cnotify_exit;
4064                 } else if (plen)
4065                         *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
4066         }
4067
4068  cnotify_exit:
4069         if (rqst.rq_iov)
4070                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
4071         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4072
4073         if (is_replayable_error(rc) &&
4074             smb2_should_replay(tcon, &retries, &cur_sleep))
4075                 goto replay_again;
4076
4077         return rc;
4078 }
4079
4080
4081
4082 /*
4083  * This is a no-op for now. We're not really interested in the reply, but
4084  * rather in the fact that the server sent one and that server->lstrp
4085  * gets updated.
4086  *
4087  * FIXME: maybe we should consider checking that the reply matches request?
4088  */
4089 static void
4090 smb2_echo_callback(struct mid_q_entry *mid)
4091 {
4092         struct TCP_Server_Info *server = mid->callback_data;
4093         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
4094         struct cifs_credits credits = { .value = 0, .instance = 0 };
4095
4096         if (mid->mid_state == MID_RESPONSE_RECEIVED
4097             || mid->mid_state == MID_RESPONSE_MALFORMED) {
4098                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4099                 credits.instance = server->reconnect_instance;
4100         }
4101
4102         release_mid(mid);
4103         add_credits(server, &credits, CIFS_ECHO_OP);
4104 }
4105
4106 void smb2_reconnect_server(struct work_struct *work)
4107 {
4108         struct TCP_Server_Info *server = container_of(work,
4109                                         struct TCP_Server_Info, reconnect.work);
4110         struct TCP_Server_Info *pserver;
4111         struct cifs_ses *ses, *ses2;
4112         struct cifs_tcon *tcon, *tcon2;
4113         struct list_head tmp_list, tmp_ses_list;
4114         bool ses_exist = false;
4115         bool tcon_selected = false;
4116         int rc;
4117         bool resched = false;
4118
4119         /* first check if ref count has reached 0, if not inc ref count */
4120         spin_lock(&cifs_tcp_ses_lock);
4121         if (!server->srv_count) {
4122                 spin_unlock(&cifs_tcp_ses_lock);
4123                 return;
4124         }
4125         server->srv_count++;
4126         spin_unlock(&cifs_tcp_ses_lock);
4127
4128         /* If server is a channel, select the primary channel */
4129         pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
4130
4131         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
4132         mutex_lock(&pserver->reconnect_mutex);
4133
4134         /* if the server is marked for termination, drop the ref count here */
4135         if (server->terminate) {
4136                 cifs_put_tcp_session(server, true);
4137                 mutex_unlock(&pserver->reconnect_mutex);
4138                 return;
4139         }
4140
4141         INIT_LIST_HEAD(&tmp_list);
4142         INIT_LIST_HEAD(&tmp_ses_list);
4143         cifs_dbg(FYI, "Reconnecting tcons and channels\n");
4144
4145         spin_lock(&cifs_tcp_ses_lock);
4146         list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
4147                 spin_lock(&ses->ses_lock);
4148                 if (ses->ses_status == SES_EXITING) {
4149                         spin_unlock(&ses->ses_lock);
4150                         continue;
4151                 }
4152                 spin_unlock(&ses->ses_lock);
4153
4154                 tcon_selected = false;
4155
4156                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
4157                         if (tcon->need_reconnect || tcon->need_reopen_files) {
4158                                 tcon->tc_count++;
4159                                 trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
4160                                                     netfs_trace_tcon_ref_get_reconnect_server);
4161                                 list_add_tail(&tcon->rlist, &tmp_list);
4162                                 tcon_selected = true;
4163                         }
4164                 }
4165                 /*
4166                  * IPC has the same lifetime as its session and uses its
4167                  * refcount.
4168                  */
4169                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
4170                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
4171                         tcon_selected = true;
4172                         cifs_smb_ses_inc_refcount(ses);
4173                 }
4174                 /*
4175                  * handle the case where channel needs to reconnect
4176                  * binding session, but tcon is healthy (some other channel
4177                  * is active)
4178                  */
4179                 spin_lock(&ses->chan_lock);
4180                 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
4181                         list_add_tail(&ses->rlist, &tmp_ses_list);
4182                         ses_exist = true;
4183                         cifs_smb_ses_inc_refcount(ses);
4184                 }
4185                 spin_unlock(&ses->chan_lock);
4186         }
4187         spin_unlock(&cifs_tcp_ses_lock);
4188
4189         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
4190                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4191                 if (!rc)
4192                         cifs_reopen_persistent_handles(tcon);
4193                 else
4194                         resched = true;
4195                 list_del_init(&tcon->rlist);
4196                 if (tcon->ipc)
4197                         cifs_put_smb_ses(tcon->ses);
4198                 else
4199                         cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_reconnect_server);
4200         }
4201
4202         if (!ses_exist)
4203                 goto done;
4204
4205         /* allocate a dummy tcon struct used for reconnect */
4206         tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_reconnect_server);
4207         if (!tcon) {
4208                 resched = true;
4209                 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4210                         list_del_init(&ses->rlist);
4211                         cifs_put_smb_ses(ses);
4212                 }
4213                 goto done;
4214         }
4215
4216         tcon->status = TID_GOOD;
4217         tcon->retry = false;
4218         tcon->need_reconnect = false;
4219
4220         /* now reconnect sessions for necessary channels */
4221         list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4222                 tcon->ses = ses;
4223                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4224                 if (rc)
4225                         resched = true;
4226                 list_del_init(&ses->rlist);
4227                 cifs_put_smb_ses(ses);
4228         }
4229         tconInfoFree(tcon, netfs_trace_tcon_ref_free_reconnect_server);
4230
4231 done:
4232         cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
4233         if (resched)
4234                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
4235         mutex_unlock(&pserver->reconnect_mutex);
4236
4237         /* now we can safely release srv struct */
4238         cifs_put_tcp_session(server, true);
4239 }
4240
4241 int
4242 SMB2_echo(struct TCP_Server_Info *server)
4243 {
4244         struct smb2_echo_req *req;
4245         int rc = 0;
4246         struct kvec iov[1];
4247         struct smb_rqst rqst = { .rq_iov = iov,
4248                                  .rq_nvec = 1 };
4249         unsigned int total_len;
4250
4251         cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
4252
4253         spin_lock(&server->srv_lock);
4254         if (server->ops->need_neg &&
4255             server->ops->need_neg(server)) {
4256                 spin_unlock(&server->srv_lock);
4257                 /* No need to send echo on newly established connections */
4258                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
4259                 return rc;
4260         }
4261         spin_unlock(&server->srv_lock);
4262
4263         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
4264                                  (void **)&req, &total_len);
4265         if (rc)
4266                 return rc;
4267
4268         req->hdr.CreditRequest = cpu_to_le16(1);
4269
4270         iov[0].iov_len = total_len;
4271         iov[0].iov_base = (char *)req;
4272
4273         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
4274                              server, CIFS_ECHO_OP, NULL);
4275         if (rc)
4276                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
4277
4278         cifs_small_buf_release(req);
4279         return rc;
4280 }
4281
4282 void
4283 SMB2_flush_free(struct smb_rqst *rqst)
4284 {
4285         if (rqst && rqst->rq_iov)
4286                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4287 }
4288
4289 int
4290 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
4291                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4292                 u64 persistent_fid, u64 volatile_fid)
4293 {
4294         struct smb2_flush_req *req;
4295         struct kvec *iov = rqst->rq_iov;
4296         unsigned int total_len;
4297         int rc;
4298
4299         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
4300                                  (void **) &req, &total_len);
4301         if (rc)
4302                 return rc;
4303
4304         req->PersistentFileId = persistent_fid;
4305         req->VolatileFileId = volatile_fid;
4306
4307         iov[0].iov_base = (char *)req;
4308         iov[0].iov_len = total_len;
4309
4310         return 0;
4311 }
4312
4313 int
4314 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4315            u64 volatile_fid)
4316 {
4317         struct cifs_ses *ses = tcon->ses;
4318         struct smb_rqst rqst;
4319         struct kvec iov[1];
4320         struct kvec rsp_iov = {NULL, 0};
4321         struct TCP_Server_Info *server;
4322         int resp_buftype = CIFS_NO_BUFFER;
4323         int flags = 0;
4324         int rc = 0;
4325         int retries = 0, cur_sleep = 1;
4326
4327 replay_again:
4328         /* reinitialize for possible replay */
4329         flags = 0;
4330         server = cifs_pick_channel(ses);
4331
4332         cifs_dbg(FYI, "flush\n");
4333         if (!ses || !(ses->server))
4334                 return -EIO;
4335
4336         if (smb3_encryption_required(tcon))
4337                 flags |= CIFS_TRANSFORM_REQ;
4338
4339         memset(&rqst, 0, sizeof(struct smb_rqst));
4340         memset(&iov, 0, sizeof(iov));
4341         rqst.rq_iov = iov;
4342         rqst.rq_nvec = 1;
4343
4344         rc = SMB2_flush_init(xid, &rqst, tcon, server,
4345                              persistent_fid, volatile_fid);
4346         if (rc)
4347                 goto flush_exit;
4348
4349         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4350
4351         if (retries)
4352                 smb2_set_replay(server, &rqst);
4353
4354         rc = cifs_send_recv(xid, ses, server,
4355                             &rqst, &resp_buftype, flags, &rsp_iov);
4356
4357         if (rc != 0) {
4358                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4359                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4360                                      rc);
4361         } else
4362                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4363                                       ses->Suid);
4364
4365  flush_exit:
4366         SMB2_flush_free(&rqst);
4367         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4368
4369         if (is_replayable_error(rc) &&
4370             smb2_should_replay(tcon, &retries, &cur_sleep))
4371                 goto replay_again;
4372
4373         return rc;
4374 }
4375
4376 #ifdef CONFIG_CIFS_SMB_DIRECT
4377 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
4378 {
4379         struct TCP_Server_Info *server = io_parms->server;
4380         struct cifs_tcon *tcon = io_parms->tcon;
4381
4382         /* we can only offload if we're connected */
4383         if (!server || !tcon)
4384                 return false;
4385
4386         /* we can only offload on an rdma connection */
4387         if (!server->rdma || !server->smbd_conn)
4388                 return false;
4389
4390         /* we don't support signed offload yet */
4391         if (server->sign)
4392                 return false;
4393
4394         /* we don't support encrypted offload yet */
4395         if (smb3_encryption_required(tcon))
4396                 return false;
4397
4398         /* offload also has its overhead, so only do it if desired */
4399         if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)
4400                 return false;
4401
4402         return true;
4403 }
4404 #endif /* CONFIG_CIFS_SMB_DIRECT */
4405
4406 /*
4407  * To form a chain of read requests, any read requests after the first should
4408  * have the end_of_chain boolean set to true.
4409  */
4410 static int
4411 smb2_new_read_req(void **buf, unsigned int *total_len,
4412         struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata,
4413         unsigned int remaining_bytes, int request_type)
4414 {
4415         int rc = -EACCES;
4416         struct smb2_read_req *req = NULL;
4417         struct smb2_hdr *shdr;
4418         struct TCP_Server_Info *server = io_parms->server;
4419
4420         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4421                                  (void **) &req, total_len);
4422         if (rc)
4423                 return rc;
4424
4425         if (server == NULL)
4426                 return -ECONNABORTED;
4427
4428         shdr = &req->hdr;
4429         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4430
4431         req->PersistentFileId = io_parms->persistent_fid;
4432         req->VolatileFileId = io_parms->volatile_fid;
4433         req->ReadChannelInfoOffset = 0; /* reserved */
4434         req->ReadChannelInfoLength = 0; /* reserved */
4435         req->Channel = 0; /* reserved */
4436         req->MinimumCount = 0;
4437         req->Length = cpu_to_le32(io_parms->length);
4438         req->Offset = cpu_to_le64(io_parms->offset);
4439
4440         trace_smb3_read_enter(rdata ? rdata->rreq->debug_id : 0,
4441                               rdata ? rdata->subreq.debug_index : 0,
4442                               rdata ? rdata->xid : 0,
4443                               io_parms->persistent_fid,
4444                               io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4445                               io_parms->offset, io_parms->length);
4446 #ifdef CONFIG_CIFS_SMB_DIRECT
4447         /*
4448          * If we want to do a RDMA write, fill in and append
4449          * smbd_buffer_descriptor_v1 to the end of read request
4450          */
4451         if (rdata && smb3_use_rdma_offload(io_parms)) {
4452                 struct smbd_buffer_descriptor_v1 *v1;
4453                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4454
4455                 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->subreq.io_iter,
4456                                              true, need_invalidate);
4457                 if (!rdata->mr)
4458                         return -EAGAIN;
4459
4460                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4461                 if (need_invalidate)
4462                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4463                 req->ReadChannelInfoOffset =
4464                         cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4465                 req->ReadChannelInfoLength =
4466                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4467                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4468                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4469                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4470                 v1->length = cpu_to_le32(rdata->mr->mr->length);
4471
4472                 *total_len += sizeof(*v1) - 1;
4473         }
4474 #endif
4475         if (request_type & CHAINED_REQUEST) {
4476                 if (!(request_type & END_OF_CHAIN)) {
4477                         /* next 8-byte aligned request */
4478                         *total_len = ALIGN(*total_len, 8);
4479                         shdr->NextCommand = cpu_to_le32(*total_len);
4480                 } else /* END_OF_CHAIN */
4481                         shdr->NextCommand = 0;
4482                 if (request_type & RELATED_REQUEST) {
4483                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4484                         /*
4485                          * Related requests use info from previous read request
4486                          * in chain.
4487                          */
4488                         shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4489                         shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4490                         req->PersistentFileId = (u64)-1;
4491                         req->VolatileFileId = (u64)-1;
4492                 }
4493         }
4494         if (remaining_bytes > io_parms->length)
4495                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
4496         else
4497                 req->RemainingBytes = 0;
4498
4499         *buf = req;
4500         return rc;
4501 }
4502
4503 static void smb2_readv_worker(struct work_struct *work)
4504 {
4505         struct cifs_io_subrequest *rdata =
4506                 container_of(work, struct cifs_io_subrequest, subreq.work);
4507
4508         netfs_read_subreq_terminated(&rdata->subreq, rdata->result, false);
4509 }
4510
4511 static void
4512 smb2_readv_callback(struct mid_q_entry *mid)
4513 {
4514         struct cifs_io_subrequest *rdata = mid->callback_data;
4515         struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode);
4516         struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4517         struct TCP_Server_Info *server = rdata->server;
4518         struct smb2_hdr *shdr =
4519                                 (struct smb2_hdr *)rdata->iov[0].iov_base;
4520         struct cifs_credits credits = {
4521                 .value = 0,
4522                 .instance = 0,
4523                 .rreq_debug_id = rdata->rreq->debug_id,
4524                 .rreq_debug_index = rdata->subreq.debug_index,
4525         };
4526         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
4527         unsigned int rreq_debug_id = rdata->rreq->debug_id;
4528         unsigned int subreq_debug_index = rdata->subreq.debug_index;
4529
4530         if (rdata->got_bytes) {
4531                 rqst.rq_iter      = rdata->subreq.io_iter;
4532         }
4533
4534         WARN_ONCE(rdata->server != mid->server,
4535                   "rdata server %p != mid server %p",
4536                   rdata->server, mid->server);
4537
4538         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n",
4539                  __func__, mid->mid, mid->mid_state, rdata->result,
4540                  rdata->got_bytes, rdata->subreq.len - rdata->subreq.transferred);
4541
4542         switch (mid->mid_state) {
4543         case MID_RESPONSE_RECEIVED:
4544                 credits.value = le16_to_cpu(shdr->CreditRequest);
4545                 credits.instance = server->reconnect_instance;
4546                 /* result already set, check signature */
4547                 if (server->sign && !mid->decrypted) {
4548                         int rc;
4549
4550                         iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
4551                         rc = smb2_verify_signature(&rqst, server);
4552                         if (rc)
4553                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4554                                          rc);
4555                 }
4556                 /* FIXME: should this be counted toward the initiating task? */
4557                 task_io_account_read(rdata->got_bytes);
4558                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4559                 break;
4560         case MID_REQUEST_SUBMITTED:
4561         case MID_RETRY_NEEDED:
4562                 __set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags);
4563                 rdata->result = -EAGAIN;
4564                 if (server->sign && rdata->got_bytes)
4565                         /* reset bytes number since we can not check a sign */
4566                         rdata->got_bytes = 0;
4567                 /* FIXME: should this be counted toward the initiating task? */
4568                 task_io_account_read(rdata->got_bytes);
4569                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4570                 break;
4571         case MID_RESPONSE_MALFORMED:
4572                 credits.value = le16_to_cpu(shdr->CreditRequest);
4573                 credits.instance = server->reconnect_instance;
4574                 fallthrough;
4575         default:
4576                 rdata->result = -EIO;
4577         }
4578 #ifdef CONFIG_CIFS_SMB_DIRECT
4579         /*
4580          * If this rdata has a memory registered, the MR can be freed
4581          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4582          * because they have limited number and are used for future I/Os
4583          */
4584         if (rdata->mr) {
4585                 smbd_deregister_mr(rdata->mr);
4586                 rdata->mr = NULL;
4587         }
4588 #endif
4589         if (rdata->result && rdata->result != -ENODATA) {
4590                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4591                 trace_smb3_read_err(rdata->rreq->debug_id,
4592                                     rdata->subreq.debug_index,
4593                                     rdata->xid,
4594                                     rdata->req->cfile->fid.persistent_fid,
4595                                     tcon->tid, tcon->ses->Suid,
4596                                     rdata->subreq.start + rdata->subreq.transferred,
4597                                     rdata->subreq.len   - rdata->subreq.transferred,
4598                                     rdata->result);
4599         } else
4600                 trace_smb3_read_done(rdata->rreq->debug_id,
4601                                      rdata->subreq.debug_index,
4602                                      rdata->xid,
4603                                      rdata->req->cfile->fid.persistent_fid,
4604                                      tcon->tid, tcon->ses->Suid,
4605                                      rdata->subreq.start + rdata->subreq.transferred,
4606                                      rdata->got_bytes);
4607
4608         if (rdata->result == -ENODATA) {
4609                 __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
4610                 rdata->result = 0;
4611         } else {
4612                 size_t trans = rdata->subreq.transferred + rdata->got_bytes;
4613                 if (trans < rdata->subreq.len &&
4614                     rdata->subreq.start + trans == ictx->remote_i_size) {
4615                         __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
4616                         rdata->result = 0;
4617                 }
4618                 __set_bit(NETFS_SREQ_MADE_PROGRESS, &rdata->subreq.flags);
4619         }
4620         trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,
4621                               server->credits, server->in_flight,
4622                               0, cifs_trace_rw_credits_read_response_clear);
4623         rdata->credits.value = 0;
4624         rdata->subreq.transferred += rdata->got_bytes;
4625         trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress);
4626         INIT_WORK(&rdata->subreq.work, smb2_readv_worker);
4627         queue_work(cifsiod_wq, &rdata->subreq.work);
4628         release_mid(mid);
4629         trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4630                               server->credits, server->in_flight,
4631                               credits.value, cifs_trace_rw_credits_read_response_add);
4632         add_credits(server, &credits, 0);
4633 }
4634
4635 /* smb2_async_readv - send an async read, and set up mid to handle result */
4636 int
4637 smb2_async_readv(struct cifs_io_subrequest *rdata)
4638 {
4639         int rc, flags = 0;
4640         char *buf;
4641         struct netfs_io_subrequest *subreq = &rdata->subreq;
4642         struct smb2_hdr *shdr;
4643         struct cifs_io_parms io_parms;
4644         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4645                                  .rq_nvec = 1 };
4646         struct TCP_Server_Info *server;
4647         struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4648         unsigned int total_len;
4649         int credit_request;
4650
4651         cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n",
4652                  __func__, subreq->start, subreq->len);
4653
4654         if (!rdata->server)
4655                 rdata->server = cifs_pick_channel(tcon->ses);
4656
4657         io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink);
4658         io_parms.server = server = rdata->server;
4659         io_parms.offset = subreq->start + subreq->transferred;
4660         io_parms.length = subreq->len   - subreq->transferred;
4661         io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid;
4662         io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid;
4663         io_parms.pid = rdata->req->pid;
4664
4665         rc = smb2_new_read_req(
4666                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4667         if (rc)
4668                 return rc;
4669
4670         if (smb3_encryption_required(io_parms.tcon))
4671                 flags |= CIFS_TRANSFORM_REQ;
4672
4673         rdata->iov[0].iov_base = buf;
4674         rdata->iov[0].iov_len = total_len;
4675         rdata->got_bytes = 0;
4676         rdata->result = 0;
4677
4678         shdr = (struct smb2_hdr *)buf;
4679
4680         if (rdata->credits.value > 0) {
4681                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(io_parms.length,
4682                                                 SMB2_MAX_BUFFER_SIZE));
4683                 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4684                 if (server->credits >= server->max_credits)
4685                         shdr->CreditRequest = cpu_to_le16(0);
4686                 else
4687                         shdr->CreditRequest = cpu_to_le16(
4688                                 min_t(int, server->max_credits -
4689                                                 server->credits, credit_request));
4690
4691                 rc = adjust_credits(server, rdata, cifs_trace_rw_credits_call_readv_adjust);
4692                 if (rc)
4693                         goto async_readv_out;
4694
4695                 flags |= CIFS_HAS_CREDITS;
4696         }
4697
4698         rc = cifs_call_async(server, &rqst,
4699                              cifs_readv_receive, smb2_readv_callback,
4700                              smb3_handle_read_data, rdata, flags,
4701                              &rdata->credits);
4702         if (rc) {
4703                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4704                 trace_smb3_read_err(rdata->rreq->debug_id,
4705                                     subreq->debug_index,
4706                                     rdata->xid, io_parms.persistent_fid,
4707                                     io_parms.tcon->tid,
4708                                     io_parms.tcon->ses->Suid,
4709                                     io_parms.offset,
4710                                     subreq->len - subreq->transferred, rc);
4711         }
4712
4713 async_readv_out:
4714         cifs_small_buf_release(buf);
4715         return rc;
4716 }
4717
4718 int
4719 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4720           unsigned int *nbytes, char **buf, int *buf_type)
4721 {
4722         struct smb_rqst rqst;
4723         int resp_buftype, rc;
4724         struct smb2_read_req *req = NULL;
4725         struct smb2_read_rsp *rsp = NULL;
4726         struct kvec iov[1];
4727         struct kvec rsp_iov;
4728         unsigned int total_len;
4729         int flags = CIFS_LOG_ERROR;
4730         struct cifs_ses *ses = io_parms->tcon->ses;
4731
4732         if (!io_parms->server)
4733                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4734
4735         *nbytes = 0;
4736         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4737         if (rc)
4738                 return rc;
4739
4740         if (smb3_encryption_required(io_parms->tcon))
4741                 flags |= CIFS_TRANSFORM_REQ;
4742
4743         iov[0].iov_base = (char *)req;
4744         iov[0].iov_len = total_len;
4745
4746         memset(&rqst, 0, sizeof(struct smb_rqst));
4747         rqst.rq_iov = iov;
4748         rqst.rq_nvec = 1;
4749
4750         rc = cifs_send_recv(xid, ses, io_parms->server,
4751                             &rqst, &resp_buftype, flags, &rsp_iov);
4752         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4753
4754         if (rc) {
4755                 if (rc != -ENODATA) {
4756                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4757                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4758                         trace_smb3_read_err(0, 0, xid,
4759                                             req->PersistentFileId,
4760                                             io_parms->tcon->tid, ses->Suid,
4761                                             io_parms->offset, io_parms->length,
4762                                             rc);
4763                 } else
4764                         trace_smb3_read_done(0, 0, xid,
4765                                              req->PersistentFileId, io_parms->tcon->tid,
4766                                              ses->Suid, io_parms->offset, 0);
4767                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4768                 cifs_small_buf_release(req);
4769                 return rc == -ENODATA ? 0 : rc;
4770         } else
4771                 trace_smb3_read_done(0, 0, xid,
4772                                      req->PersistentFileId,
4773                                      io_parms->tcon->tid, ses->Suid,
4774                                      io_parms->offset, io_parms->length);
4775
4776         cifs_small_buf_release(req);
4777
4778         *nbytes = le32_to_cpu(rsp->DataLength);
4779         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4780             (*nbytes > io_parms->length)) {
4781                 cifs_dbg(FYI, "bad length %d for count %d\n",
4782                          *nbytes, io_parms->length);
4783                 rc = -EIO;
4784                 *nbytes = 0;
4785         }
4786
4787         if (*buf) {
4788                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4789                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4790         } else if (resp_buftype != CIFS_NO_BUFFER) {
4791                 *buf = rsp_iov.iov_base;
4792                 if (resp_buftype == CIFS_SMALL_BUFFER)
4793                         *buf_type = CIFS_SMALL_BUFFER;
4794                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4795                         *buf_type = CIFS_LARGE_BUFFER;
4796         }
4797         return rc;
4798 }
4799
4800 /*
4801  * Check the mid_state and signature on received buffer (if any), and queue the
4802  * workqueue completion task.
4803  */
4804 static void
4805 smb2_writev_callback(struct mid_q_entry *mid)
4806 {
4807         struct cifs_io_subrequest *wdata = mid->callback_data;
4808         struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4809         struct TCP_Server_Info *server = wdata->server;
4810         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4811         struct cifs_credits credits = {
4812                 .value = 0,
4813                 .instance = 0,
4814                 .rreq_debug_id = wdata->rreq->debug_id,
4815                 .rreq_debug_index = wdata->subreq.debug_index,
4816         };
4817         unsigned int rreq_debug_id = wdata->rreq->debug_id;
4818         unsigned int subreq_debug_index = wdata->subreq.debug_index;
4819         ssize_t result = 0;
4820         size_t written;
4821
4822         WARN_ONCE(wdata->server != mid->server,
4823                   "wdata server %p != mid server %p",
4824                   wdata->server, mid->server);
4825
4826         switch (mid->mid_state) {
4827         case MID_RESPONSE_RECEIVED:
4828                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4829                 credits.instance = server->reconnect_instance;
4830                 result = smb2_check_receive(mid, server, 0);
4831                 if (result != 0)
4832                         break;
4833
4834                 written = le32_to_cpu(rsp->DataLength);
4835                 /*
4836                  * Mask off high 16 bits when bytes written as returned
4837                  * by the server is greater than bytes requested by the
4838                  * client. OS/2 servers are known to set incorrect
4839                  * CountHigh values.
4840                  */
4841                 if (written > wdata->subreq.len)
4842                         written &= 0xFFFF;
4843
4844                 cifs_stats_bytes_written(tcon, written);
4845
4846                 if (written < wdata->subreq.len) {
4847                         wdata->result = -ENOSPC;
4848                 } else if (written > 0) {
4849                         wdata->subreq.len = written;
4850                         __set_bit(NETFS_SREQ_MADE_PROGRESS, &wdata->subreq.flags);
4851                 }
4852                 break;
4853         case MID_REQUEST_SUBMITTED:
4854         case MID_RETRY_NEEDED:
4855                 result = -EAGAIN;
4856                 break;
4857         case MID_RESPONSE_MALFORMED:
4858                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4859                 credits.instance = server->reconnect_instance;
4860                 fallthrough;
4861         default:
4862                 result = -EIO;
4863                 break;
4864         }
4865 #ifdef CONFIG_CIFS_SMB_DIRECT
4866         /*
4867          * If this wdata has a memory registered, the MR can be freed
4868          * The number of MRs available is limited, it's important to recover
4869          * used MR as soon as I/O is finished. Hold MR longer in the later
4870          * I/O process can possibly result in I/O deadlock due to lack of MR
4871          * to send request on I/O retry
4872          */
4873         if (wdata->mr) {
4874                 smbd_deregister_mr(wdata->mr);
4875                 wdata->mr = NULL;
4876         }
4877 #endif
4878         if (result) {
4879                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4880                 trace_smb3_write_err(wdata->rreq->debug_id,
4881                                      wdata->subreq.debug_index,
4882                                      wdata->xid,
4883                                      wdata->req->cfile->fid.persistent_fid,
4884                                      tcon->tid, tcon->ses->Suid, wdata->subreq.start,
4885                                      wdata->subreq.len, wdata->result);
4886                 if (wdata->result == -ENOSPC)
4887                         pr_warn_once("Out of space writing to %s\n",
4888                                      tcon->tree_name);
4889         } else
4890                 trace_smb3_write_done(wdata->rreq->debug_id,
4891                                       wdata->subreq.debug_index,
4892                                       wdata->xid,
4893                                       wdata->req->cfile->fid.persistent_fid,
4894                                       tcon->tid, tcon->ses->Suid,
4895                                       wdata->subreq.start, wdata->subreq.len);
4896
4897         trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, wdata->credits.value,
4898                               server->credits, server->in_flight,
4899                               0, cifs_trace_rw_credits_write_response_clear);
4900         wdata->credits.value = 0;
4901         trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_progress);
4902         cifs_write_subrequest_terminated(wdata, result ?: written, true);
4903         release_mid(mid);
4904         trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4905                               server->credits, server->in_flight,
4906                               credits.value, cifs_trace_rw_credits_write_response_add);
4907         add_credits(server, &credits, 0);
4908 }
4909
4910 /* smb2_async_writev - send an async write, and set up mid to handle result */
4911 void
4912 smb2_async_writev(struct cifs_io_subrequest *wdata)
4913 {
4914         int rc = -EACCES, flags = 0;
4915         struct smb2_write_req *req = NULL;
4916         struct smb2_hdr *shdr;
4917         struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4918         struct TCP_Server_Info *server = wdata->server;
4919         struct kvec iov[1];
4920         struct smb_rqst rqst = { };
4921         unsigned int total_len, xid = wdata->xid;
4922         struct cifs_io_parms _io_parms;
4923         struct cifs_io_parms *io_parms = NULL;
4924         int credit_request;
4925
4926         /*
4927          * in future we may get cifs_io_parms passed in from the caller,
4928          * but for now we construct it here...
4929          */
4930         _io_parms = (struct cifs_io_parms) {
4931                 .tcon = tcon,
4932                 .server = server,
4933                 .offset = wdata->subreq.start,
4934                 .length = wdata->subreq.len,
4935                 .persistent_fid = wdata->req->cfile->fid.persistent_fid,
4936                 .volatile_fid = wdata->req->cfile->fid.volatile_fid,
4937                 .pid = wdata->req->pid,
4938         };
4939         io_parms = &_io_parms;
4940
4941         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4942                                  (void **) &req, &total_len);
4943         if (rc)
4944                 goto out;
4945
4946         rqst.rq_iov = iov;
4947         rqst.rq_iter = wdata->subreq.io_iter;
4948
4949         rqst.rq_iov[0].iov_len = total_len - 1;
4950         rqst.rq_iov[0].iov_base = (char *)req;
4951         rqst.rq_nvec += 1;
4952
4953         if (smb3_encryption_required(tcon))
4954                 flags |= CIFS_TRANSFORM_REQ;
4955
4956         shdr = (struct smb2_hdr *)req;
4957         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4958
4959         req->PersistentFileId = io_parms->persistent_fid;
4960         req->VolatileFileId = io_parms->volatile_fid;
4961         req->WriteChannelInfoOffset = 0;
4962         req->WriteChannelInfoLength = 0;
4963         req->Channel = SMB2_CHANNEL_NONE;
4964         req->Length = cpu_to_le32(io_parms->length);
4965         req->Offset = cpu_to_le64(io_parms->offset);
4966         req->DataOffset = cpu_to_le16(
4967                                 offsetof(struct smb2_write_req, Buffer));
4968         req->RemainingBytes = 0;
4969
4970         trace_smb3_write_enter(wdata->rreq->debug_id,
4971                                wdata->subreq.debug_index,
4972                                wdata->xid,
4973                                io_parms->persistent_fid,
4974                                io_parms->tcon->tid,
4975                                io_parms->tcon->ses->Suid,
4976                                io_parms->offset,
4977                                io_parms->length);
4978
4979 #ifdef CONFIG_CIFS_SMB_DIRECT
4980         /*
4981          * If we want to do a server RDMA read, fill in and append
4982          * smbd_buffer_descriptor_v1 to the end of write request
4983          */
4984         if (smb3_use_rdma_offload(io_parms)) {
4985                 struct smbd_buffer_descriptor_v1 *v1;
4986                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4987
4988                 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->subreq.io_iter,
4989                                              false, need_invalidate);
4990                 if (!wdata->mr) {
4991                         rc = -EAGAIN;
4992                         goto async_writev_out;
4993                 }
4994                 /* For RDMA read, I/O size is in RemainingBytes not in Length */
4995                 req->RemainingBytes = req->Length;
4996                 req->Length = 0;
4997                 req->DataOffset = 0;
4998                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4999                 if (need_invalidate)
5000                         req->Channel = SMB2_CHANNEL_RDMA_V1;
5001                 req->WriteChannelInfoOffset =
5002                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
5003                 req->WriteChannelInfoLength =
5004                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
5005                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
5006                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
5007                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
5008                 v1->length = cpu_to_le32(wdata->mr->mr->length);
5009
5010                 rqst.rq_iov[0].iov_len += sizeof(*v1);
5011
5012                 /*
5013                  * We keep wdata->subreq.io_iter,
5014                  * but we have to truncate rqst.rq_iter
5015                  */
5016                 iov_iter_truncate(&rqst.rq_iter, 0);
5017         }
5018 #endif
5019
5020         if (wdata->subreq.retry_count > 0)
5021                 smb2_set_replay(server, &rqst);
5022
5023         cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
5024                  io_parms->offset, io_parms->length, iov_iter_count(&wdata->subreq.io_iter));
5025
5026         if (wdata->credits.value > 0) {
5027                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->subreq.len,
5028                                                     SMB2_MAX_BUFFER_SIZE));
5029                 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
5030                 if (server->credits >= server->max_credits)
5031                         shdr->CreditRequest = cpu_to_le16(0);
5032                 else
5033                         shdr->CreditRequest = cpu_to_le16(
5034                                 min_t(int, server->max_credits -
5035                                                 server->credits, credit_request));
5036
5037                 rc = adjust_credits(server, wdata, cifs_trace_rw_credits_call_writev_adjust);
5038                 if (rc)
5039                         goto async_writev_out;
5040
5041                 flags |= CIFS_HAS_CREDITS;
5042         }
5043
5044         /* XXX: compression + encryption is unsupported for now */
5045         if (((flags & CIFS_TRANSFORM_REQ) != CIFS_TRANSFORM_REQ) && should_compress(tcon, &rqst))
5046                 flags |= CIFS_COMPRESS_REQ;
5047
5048         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
5049                              wdata, flags, &wdata->credits);
5050         /* Can't touch wdata if rc == 0 */
5051         if (rc) {
5052                 trace_smb3_write_err(wdata->rreq->debug_id,
5053                                      wdata->subreq.debug_index,
5054                                      xid,
5055                                      io_parms->persistent_fid,
5056                                      io_parms->tcon->tid,
5057                                      io_parms->tcon->ses->Suid,
5058                                      io_parms->offset,
5059                                      io_parms->length,
5060                                      rc);
5061                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
5062         }
5063
5064 async_writev_out:
5065         cifs_small_buf_release(req);
5066 out:
5067         if (rc) {
5068                 trace_smb3_rw_credits(wdata->rreq->debug_id,
5069                                       wdata->subreq.debug_index,
5070                                       wdata->credits.value,
5071                                       server->credits, server->in_flight,
5072                                       -(int)wdata->credits.value,
5073                                       cifs_trace_rw_credits_write_response_clear);
5074                 add_credits_and_wake_if(wdata->server, &wdata->credits, 0);
5075                 cifs_write_subrequest_terminated(wdata, rc, true);
5076         }
5077 }
5078
5079 /*
5080  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
5081  * The length field from io_parms must be at least 1 and indicates a number of
5082  * elements with data to write that begins with position 1 in iov array. All
5083  * data length is specified by count.
5084  */
5085 int
5086 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
5087            unsigned int *nbytes, struct kvec *iov, int n_vec)
5088 {
5089         struct smb_rqst rqst;
5090         int rc = 0;
5091         struct smb2_write_req *req = NULL;
5092         struct smb2_write_rsp *rsp = NULL;
5093         int resp_buftype;
5094         struct kvec rsp_iov;
5095         int flags = 0;
5096         unsigned int total_len;
5097         struct TCP_Server_Info *server;
5098         int retries = 0, cur_sleep = 1;
5099
5100 replay_again:
5101         /* reinitialize for possible replay */
5102         flags = 0;
5103         *nbytes = 0;
5104         if (!io_parms->server)
5105                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
5106         server = io_parms->server;
5107         if (server == NULL)
5108                 return -ECONNABORTED;
5109
5110         if (n_vec < 1)
5111                 return rc;
5112
5113         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
5114                                  (void **) &req, &total_len);
5115         if (rc)
5116                 return rc;
5117
5118         if (smb3_encryption_required(io_parms->tcon))
5119                 flags |= CIFS_TRANSFORM_REQ;
5120
5121         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
5122
5123         req->PersistentFileId = io_parms->persistent_fid;
5124         req->VolatileFileId = io_parms->volatile_fid;
5125         req->WriteChannelInfoOffset = 0;
5126         req->WriteChannelInfoLength = 0;
5127         req->Channel = 0;
5128         req->Length = cpu_to_le32(io_parms->length);
5129         req->Offset = cpu_to_le64(io_parms->offset);
5130         req->DataOffset = cpu_to_le16(
5131                                 offsetof(struct smb2_write_req, Buffer));
5132         req->RemainingBytes = 0;
5133
5134         trace_smb3_write_enter(0, 0, xid, io_parms->persistent_fid,
5135                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
5136                 io_parms->offset, io_parms->length);
5137
5138         iov[0].iov_base = (char *)req;
5139         /* 1 for Buffer */
5140         iov[0].iov_len = total_len - 1;
5141
5142         memset(&rqst, 0, sizeof(struct smb_rqst));
5143         rqst.rq_iov = iov;
5144         rqst.rq_nvec = n_vec + 1;
5145
5146         if (retries)
5147                 smb2_set_replay(server, &rqst);
5148
5149         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
5150                             &rqst,
5151                             &resp_buftype, flags, &rsp_iov);
5152         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
5153
5154         if (rc) {
5155                 trace_smb3_write_err(0, 0, xid,
5156                                      req->PersistentFileId,
5157                                      io_parms->tcon->tid,
5158                                      io_parms->tcon->ses->Suid,
5159                                      io_parms->offset, io_parms->length, rc);
5160                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
5161                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
5162         } else {
5163                 *nbytes = le32_to_cpu(rsp->DataLength);
5164                 cifs_stats_bytes_written(io_parms->tcon, *nbytes);
5165                 trace_smb3_write_done(0, 0, xid,
5166                                       req->PersistentFileId,
5167                                       io_parms->tcon->tid,
5168                                       io_parms->tcon->ses->Suid,
5169                                       io_parms->offset, *nbytes);
5170         }
5171
5172         cifs_small_buf_release(req);
5173         free_rsp_buf(resp_buftype, rsp);
5174
5175         if (is_replayable_error(rc) &&
5176             smb2_should_replay(io_parms->tcon, &retries, &cur_sleep))
5177                 goto replay_again;
5178
5179         return rc;
5180 }
5181
5182 int posix_info_sid_size(const void *beg, const void *end)
5183 {
5184         size_t subauth;
5185         int total;
5186
5187         if (beg + 1 > end)
5188                 return -1;
5189
5190         subauth = *(u8 *)(beg+1);
5191         if (subauth < 1 || subauth > 15)
5192                 return -1;
5193
5194         total = 1 + 1 + 6 + 4*subauth;
5195         if (beg + total > end)
5196                 return -1;
5197
5198         return total;
5199 }
5200
5201 int posix_info_parse(const void *beg, const void *end,
5202                      struct smb2_posix_info_parsed *out)
5203
5204 {
5205         int total_len = 0;
5206         int owner_len, group_len;
5207         int name_len;
5208         const void *owner_sid;
5209         const void *group_sid;
5210         const void *name;
5211
5212         /* if no end bound given, assume payload to be correct */
5213         if (!end) {
5214                 const struct smb2_posix_info *p = beg;
5215
5216                 end = beg + le32_to_cpu(p->NextEntryOffset);
5217                 /* last element will have a 0 offset, pick a sensible bound */
5218                 if (end == beg)
5219                         end += 0xFFFF;
5220         }
5221
5222         /* check base buf */
5223         if (beg + sizeof(struct smb2_posix_info) > end)
5224                 return -1;
5225         total_len = sizeof(struct smb2_posix_info);
5226
5227         /* check owner sid */
5228         owner_sid = beg + total_len;
5229         owner_len = posix_info_sid_size(owner_sid, end);
5230         if (owner_len < 0)
5231                 return -1;
5232         total_len += owner_len;
5233
5234         /* check group sid */
5235         group_sid = beg + total_len;
5236         group_len = posix_info_sid_size(group_sid, end);
5237         if (group_len < 0)
5238                 return -1;
5239         total_len += group_len;
5240
5241         /* check name len */
5242         if (beg + total_len + 4 > end)
5243                 return -1;
5244         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
5245         if (name_len < 1 || name_len > 0xFFFF)
5246                 return -1;
5247         total_len += 4;
5248
5249         /* check name */
5250         name = beg + total_len;
5251         if (name + name_len > end)
5252                 return -1;
5253         total_len += name_len;
5254
5255         if (out) {
5256                 out->base = beg;
5257                 out->size = total_len;
5258                 out->name_len = name_len;
5259                 out->name = name;
5260                 memcpy(&out->owner, owner_sid, owner_len);
5261                 memcpy(&out->group, group_sid, group_len);
5262         }
5263         return total_len;
5264 }
5265
5266 static int posix_info_extra_size(const void *beg, const void *end)
5267 {
5268         int len = posix_info_parse(beg, end, NULL);
5269
5270         if (len < 0)
5271                 return -1;
5272         return len - sizeof(struct smb2_posix_info);
5273 }
5274
5275 static unsigned int
5276 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
5277             size_t size)
5278 {
5279         int len;
5280         unsigned int entrycount = 0;
5281         unsigned int next_offset = 0;
5282         char *entryptr;
5283         FILE_DIRECTORY_INFO *dir_info;
5284
5285         if (bufstart == NULL)
5286                 return 0;
5287
5288         entryptr = bufstart;
5289
5290         while (1) {
5291                 if (entryptr + next_offset < entryptr ||
5292                     entryptr + next_offset > end_of_buf ||
5293                     entryptr + next_offset + size > end_of_buf) {
5294                         cifs_dbg(VFS, "malformed search entry would overflow\n");
5295                         break;
5296                 }
5297
5298                 entryptr = entryptr + next_offset;
5299                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
5300
5301                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
5302                         len = posix_info_extra_size(entryptr, end_of_buf);
5303                 else
5304                         len = le32_to_cpu(dir_info->FileNameLength);
5305
5306                 if (len < 0 ||
5307                     entryptr + len < entryptr ||
5308                     entryptr + len > end_of_buf ||
5309                     entryptr + len + size > end_of_buf) {
5310                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
5311                                  end_of_buf);
5312                         break;
5313                 }
5314
5315                 *lastentry = entryptr;
5316                 entrycount++;
5317
5318                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
5319                 if (!next_offset)
5320                         break;
5321         }
5322
5323         return entrycount;
5324 }
5325
5326 /*
5327  * Readdir/FindFirst
5328  */
5329 int SMB2_query_directory_init(const unsigned int xid,
5330                               struct cifs_tcon *tcon,
5331                               struct TCP_Server_Info *server,
5332                               struct smb_rqst *rqst,
5333                               u64 persistent_fid, u64 volatile_fid,
5334                               int index, int info_level)
5335 {
5336         struct smb2_query_directory_req *req;
5337         unsigned char *bufptr;
5338         __le16 asteriks = cpu_to_le16('*');
5339         unsigned int output_size = CIFSMaxBufSize -
5340                 MAX_SMB2_CREATE_RESPONSE_SIZE -
5341                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
5342         unsigned int total_len;
5343         struct kvec *iov = rqst->rq_iov;
5344         int len, rc;
5345
5346         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
5347                                  (void **) &req, &total_len);
5348         if (rc)
5349                 return rc;
5350
5351         switch (info_level) {
5352         case SMB_FIND_FILE_DIRECTORY_INFO:
5353                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
5354                 break;
5355         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5356                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
5357                 break;
5358         case SMB_FIND_FILE_POSIX_INFO:
5359                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
5360                 break;
5361         case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5362                 req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION;
5363                 break;
5364         default:
5365                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5366                         info_level);
5367                 return -EINVAL;
5368         }
5369
5370         req->FileIndex = cpu_to_le32(index);
5371         req->PersistentFileId = persistent_fid;
5372         req->VolatileFileId = volatile_fid;
5373
5374         len = 0x2;
5375         bufptr = req->Buffer;
5376         memcpy(bufptr, &asteriks, len);
5377
5378         req->FileNameOffset =
5379                 cpu_to_le16(sizeof(struct smb2_query_directory_req));
5380         req->FileNameLength = cpu_to_le16(len);
5381         /*
5382          * BB could be 30 bytes or so longer if we used SMB2 specific
5383          * buffer lengths, but this is safe and close enough.
5384          */
5385         output_size = min_t(unsigned int, output_size, server->maxBuf);
5386         output_size = min_t(unsigned int, output_size, 2 << 15);
5387         req->OutputBufferLength = cpu_to_le32(output_size);
5388
5389         iov[0].iov_base = (char *)req;
5390         /* 1 for Buffer */
5391         iov[0].iov_len = total_len - 1;
5392
5393         iov[1].iov_base = (char *)(req->Buffer);
5394         iov[1].iov_len = len;
5395
5396         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
5397                         tcon->ses->Suid, index, output_size);
5398
5399         return 0;
5400 }
5401
5402 void SMB2_query_directory_free(struct smb_rqst *rqst)
5403 {
5404         if (rqst && rqst->rq_iov) {
5405                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
5406         }
5407 }
5408
5409 int
5410 smb2_parse_query_directory(struct cifs_tcon *tcon,
5411                            struct kvec *rsp_iov,
5412                            int resp_buftype,
5413                            struct cifs_search_info *srch_inf)
5414 {
5415         struct smb2_query_directory_rsp *rsp;
5416         size_t info_buf_size;
5417         char *end_of_smb;
5418         int rc;
5419
5420         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
5421
5422         switch (srch_inf->info_level) {
5423         case SMB_FIND_FILE_DIRECTORY_INFO:
5424                 info_buf_size = sizeof(FILE_DIRECTORY_INFO);
5425                 break;
5426         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5427                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
5428                 break;
5429         case SMB_FIND_FILE_POSIX_INFO:
5430                 /* note that posix payload are variable size */
5431                 info_buf_size = sizeof(struct smb2_posix_info);
5432                 break;
5433         case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5434                 info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO);
5435                 break;
5436         default:
5437                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5438                          srch_inf->info_level);
5439                 return -EINVAL;
5440         }
5441
5442         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5443                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
5444                                info_buf_size);
5445         if (rc) {
5446                 cifs_tcon_dbg(VFS, "bad info payload");
5447                 return rc;
5448         }
5449
5450         srch_inf->unicode = true;
5451
5452         if (srch_inf->ntwrk_buf_start) {
5453                 if (srch_inf->smallBuf)
5454                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
5455                 else
5456                         cifs_buf_release(srch_inf->ntwrk_buf_start);
5457         }
5458         srch_inf->ntwrk_buf_start = (char *)rsp;
5459         srch_inf->srch_entries_start = srch_inf->last_entry =
5460                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
5461         end_of_smb = rsp_iov->iov_len + (char *)rsp;
5462
5463         srch_inf->entries_in_buffer = num_entries(
5464                 srch_inf->info_level,
5465                 srch_inf->srch_entries_start,
5466                 end_of_smb,
5467                 &srch_inf->last_entry,
5468                 info_buf_size);
5469
5470         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
5471         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
5472                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
5473                  srch_inf->srch_entries_start, srch_inf->last_entry);
5474         if (resp_buftype == CIFS_LARGE_BUFFER)
5475                 srch_inf->smallBuf = false;
5476         else if (resp_buftype == CIFS_SMALL_BUFFER)
5477                 srch_inf->smallBuf = true;
5478         else
5479                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
5480
5481         return 0;
5482 }
5483
5484 int
5485 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5486                      u64 persistent_fid, u64 volatile_fid, int index,
5487                      struct cifs_search_info *srch_inf)
5488 {
5489         struct smb_rqst rqst;
5490         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5491         struct smb2_query_directory_rsp *rsp = NULL;
5492         int resp_buftype = CIFS_NO_BUFFER;
5493         struct kvec rsp_iov;
5494         int rc = 0;
5495         struct cifs_ses *ses = tcon->ses;
5496         struct TCP_Server_Info *server;
5497         int flags = 0;
5498         int retries = 0, cur_sleep = 1;
5499
5500 replay_again:
5501         /* reinitialize for possible replay */
5502         flags = 0;
5503         server = cifs_pick_channel(ses);
5504
5505         if (!ses || !(ses->server))
5506                 return -EIO;
5507
5508         if (smb3_encryption_required(tcon))
5509                 flags |= CIFS_TRANSFORM_REQ;
5510
5511         memset(&rqst, 0, sizeof(struct smb_rqst));
5512         memset(&iov, 0, sizeof(iov));
5513         rqst.rq_iov = iov;
5514         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5515
5516         rc = SMB2_query_directory_init(xid, tcon, server,
5517                                        &rqst, persistent_fid,
5518                                        volatile_fid, index,
5519                                        srch_inf->info_level);
5520         if (rc)
5521                 goto qdir_exit;
5522
5523         if (retries)
5524                 smb2_set_replay(server, &rqst);
5525
5526         rc = cifs_send_recv(xid, ses, server,
5527                             &rqst, &resp_buftype, flags, &rsp_iov);
5528         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5529
5530         if (rc) {
5531                 if (rc == -ENODATA &&
5532                     rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5533                         trace_smb3_query_dir_done(xid, persistent_fid,
5534                                 tcon->tid, tcon->ses->Suid, index, 0);
5535                         srch_inf->endOfSearch = true;
5536                         rc = 0;
5537                 } else {
5538                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5539                                 tcon->ses->Suid, index, 0, rc);
5540                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5541                 }
5542                 goto qdir_exit;
5543         }
5544
5545         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
5546                                         srch_inf);
5547         if (rc) {
5548                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5549                         tcon->ses->Suid, index, 0, rc);
5550                 goto qdir_exit;
5551         }
5552         resp_buftype = CIFS_NO_BUFFER;
5553
5554         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5555                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5556
5557 qdir_exit:
5558         SMB2_query_directory_free(&rqst);
5559         free_rsp_buf(resp_buftype, rsp);
5560
5561         if (is_replayable_error(rc) &&
5562             smb2_should_replay(tcon, &retries, &cur_sleep))
5563                 goto replay_again;
5564
5565         return rc;
5566 }
5567
5568 int
5569 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5570                    struct smb_rqst *rqst,
5571                    u64 persistent_fid, u64 volatile_fid, u32 pid,
5572                    u8 info_class, u8 info_type, u32 additional_info,
5573                    void **data, unsigned int *size)
5574 {
5575         struct smb2_set_info_req *req;
5576         struct kvec *iov = rqst->rq_iov;
5577         unsigned int i, total_len;
5578         int rc;
5579
5580         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5581                                  (void **) &req, &total_len);
5582         if (rc)
5583                 return rc;
5584
5585         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5586         req->InfoType = info_type;
5587         req->FileInfoClass = info_class;
5588         req->PersistentFileId = persistent_fid;
5589         req->VolatileFileId = volatile_fid;
5590         req->AdditionalInformation = cpu_to_le32(additional_info);
5591
5592         req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
5593         req->BufferLength = cpu_to_le32(*size);
5594
5595         memcpy(req->Buffer, *data, *size);
5596         total_len += *size;
5597
5598         iov[0].iov_base = (char *)req;
5599         /* 1 for Buffer */
5600         iov[0].iov_len = total_len - 1;
5601
5602         for (i = 1; i < rqst->rq_nvec; i++) {
5603                 le32_add_cpu(&req->BufferLength, size[i]);
5604                 iov[i].iov_base = (char *)data[i];
5605                 iov[i].iov_len = size[i];
5606         }
5607
5608         return 0;
5609 }
5610
5611 void
5612 SMB2_set_info_free(struct smb_rqst *rqst)
5613 {
5614         if (rqst && rqst->rq_iov)
5615                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5616 }
5617
5618 static int
5619 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5620                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5621                u8 info_type, u32 additional_info, unsigned int num,
5622                 void **data, unsigned int *size)
5623 {
5624         struct smb_rqst rqst;
5625         struct smb2_set_info_rsp *rsp = NULL;
5626         struct kvec *iov;
5627         struct kvec rsp_iov;
5628         int rc = 0;
5629         int resp_buftype;
5630         struct cifs_ses *ses = tcon->ses;
5631         struct TCP_Server_Info *server;
5632         int flags = 0;
5633         int retries = 0, cur_sleep = 1;
5634
5635 replay_again:
5636         /* reinitialize for possible replay */
5637         flags = 0;
5638         server = cifs_pick_channel(ses);
5639
5640         if (!ses || !server)
5641                 return -EIO;
5642
5643         if (!num)
5644                 return -EINVAL;
5645
5646         if (smb3_encryption_required(tcon))
5647                 flags |= CIFS_TRANSFORM_REQ;
5648
5649         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5650         if (!iov)
5651                 return -ENOMEM;
5652
5653         memset(&rqst, 0, sizeof(struct smb_rqst));
5654         rqst.rq_iov = iov;
5655         rqst.rq_nvec = num;
5656
5657         rc = SMB2_set_info_init(tcon, server,
5658                                 &rqst, persistent_fid, volatile_fid, pid,
5659                                 info_class, info_type, additional_info,
5660                                 data, size);
5661         if (rc) {
5662                 kfree(iov);
5663                 return rc;
5664         }
5665
5666         if (retries)
5667                 smb2_set_replay(server, &rqst);
5668
5669         rc = cifs_send_recv(xid, ses, server,
5670                             &rqst, &resp_buftype, flags,
5671                             &rsp_iov);
5672         SMB2_set_info_free(&rqst);
5673         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5674
5675         if (rc != 0) {
5676                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5677                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5678                                 ses->Suid, info_class, (__u32)info_type, rc);
5679         }
5680
5681         free_rsp_buf(resp_buftype, rsp);
5682         kfree(iov);
5683
5684         if (is_replayable_error(rc) &&
5685             smb2_should_replay(tcon, &retries, &cur_sleep))
5686                 goto replay_again;
5687
5688         return rc;
5689 }
5690
5691 int
5692 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5693              u64 volatile_fid, u32 pid, loff_t new_eof)
5694 {
5695         struct smb2_file_eof_info info;
5696         void *data;
5697         unsigned int size;
5698
5699         info.EndOfFile = cpu_to_le64(new_eof);
5700
5701         data = &info;
5702         size = sizeof(struct smb2_file_eof_info);
5703
5704         trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof);
5705
5706         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5707                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5708                         0, 1, &data, &size);
5709 }
5710
5711 int
5712 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5713                 u64 persistent_fid, u64 volatile_fid,
5714                 struct smb_ntsd *pnntsd, int pacllen, int aclflag)
5715 {
5716         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5717                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5718                         1, (void **)&pnntsd, &pacllen);
5719 }
5720
5721 int
5722 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5723             u64 persistent_fid, u64 volatile_fid,
5724             struct smb2_file_full_ea_info *buf, int len)
5725 {
5726         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5727                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5728                 0, 1, (void **)&buf, &len);
5729 }
5730
5731 int
5732 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5733                   const u64 persistent_fid, const u64 volatile_fid,
5734                   __u8 oplock_level)
5735 {
5736         struct smb_rqst rqst;
5737         int rc;
5738         struct smb2_oplock_break *req = NULL;
5739         struct cifs_ses *ses = tcon->ses;
5740         struct TCP_Server_Info *server;
5741         int flags = CIFS_OBREAK_OP;
5742         unsigned int total_len;
5743         struct kvec iov[1];
5744         struct kvec rsp_iov;
5745         int resp_buf_type;
5746         int retries = 0, cur_sleep = 1;
5747
5748 replay_again:
5749         /* reinitialize for possible replay */
5750         flags = CIFS_OBREAK_OP;
5751         server = cifs_pick_channel(ses);
5752
5753         cifs_dbg(FYI, "SMB2_oplock_break\n");
5754         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5755                                  (void **) &req, &total_len);
5756         if (rc)
5757                 return rc;
5758
5759         if (smb3_encryption_required(tcon))
5760                 flags |= CIFS_TRANSFORM_REQ;
5761
5762         req->VolatileFid = volatile_fid;
5763         req->PersistentFid = persistent_fid;
5764         req->OplockLevel = oplock_level;
5765         req->hdr.CreditRequest = cpu_to_le16(1);
5766
5767         flags |= CIFS_NO_RSP_BUF;
5768
5769         iov[0].iov_base = (char *)req;
5770         iov[0].iov_len = total_len;
5771
5772         memset(&rqst, 0, sizeof(struct smb_rqst));
5773         rqst.rq_iov = iov;
5774         rqst.rq_nvec = 1;
5775
5776         if (retries)
5777                 smb2_set_replay(server, &rqst);
5778
5779         rc = cifs_send_recv(xid, ses, server,
5780                             &rqst, &resp_buf_type, flags, &rsp_iov);
5781         cifs_small_buf_release(req);
5782         if (rc) {
5783                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5784                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5785         }
5786
5787         if (is_replayable_error(rc) &&
5788             smb2_should_replay(tcon, &retries, &cur_sleep))
5789                 goto replay_again;
5790
5791         return rc;
5792 }
5793
5794 void
5795 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5796                              struct kstatfs *kst)
5797 {
5798         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5799                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5800         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5801         kst->f_bfree  = kst->f_bavail =
5802                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5803         return;
5804 }
5805
5806 static void
5807 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5808                         struct kstatfs *kst)
5809 {
5810         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5811         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5812         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5813         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5814                 kst->f_bavail = kst->f_bfree;
5815         else
5816                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5817         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5818                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5819         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5820                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5821
5822         return;
5823 }
5824
5825 static int
5826 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5827                    struct TCP_Server_Info *server,
5828                    int level, int outbuf_len, u64 persistent_fid,
5829                    u64 volatile_fid)
5830 {
5831         int rc;
5832         struct smb2_query_info_req *req;
5833         unsigned int total_len;
5834
5835         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5836
5837         if ((tcon->ses == NULL) || server == NULL)
5838                 return -EIO;
5839
5840         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5841                                  (void **) &req, &total_len);
5842         if (rc)
5843                 return rc;
5844
5845         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5846         req->FileInfoClass = level;
5847         req->PersistentFileId = persistent_fid;
5848         req->VolatileFileId = volatile_fid;
5849         /* 1 for pad */
5850         req->InputBufferOffset =
5851                         cpu_to_le16(sizeof(struct smb2_query_info_req));
5852         req->OutputBufferLength = cpu_to_le32(
5853                 outbuf_len + sizeof(struct smb2_query_info_rsp));
5854
5855         iov->iov_base = (char *)req;
5856         iov->iov_len = total_len;
5857         return 0;
5858 }
5859
5860 static inline void free_qfs_info_req(struct kvec *iov)
5861 {
5862         cifs_buf_release(iov->iov_base);
5863 }
5864
5865 int
5866 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5867               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5868 {
5869         struct smb_rqst rqst;
5870         struct smb2_query_info_rsp *rsp = NULL;
5871         struct kvec iov;
5872         struct kvec rsp_iov;
5873         int rc = 0;
5874         int resp_buftype;
5875         struct cifs_ses *ses = tcon->ses;
5876         struct TCP_Server_Info *server;
5877         FILE_SYSTEM_POSIX_INFO *info = NULL;
5878         int flags = 0;
5879         int retries = 0, cur_sleep = 1;
5880
5881 replay_again:
5882         /* reinitialize for possible replay */
5883         flags = 0;
5884         server = cifs_pick_channel(ses);
5885
5886         rc = build_qfs_info_req(&iov, tcon, server,
5887                                 FS_POSIX_INFORMATION,
5888                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5889                                 persistent_fid, volatile_fid);
5890         if (rc)
5891                 return rc;
5892
5893         if (smb3_encryption_required(tcon))
5894                 flags |= CIFS_TRANSFORM_REQ;
5895
5896         memset(&rqst, 0, sizeof(struct smb_rqst));
5897         rqst.rq_iov = &iov;
5898         rqst.rq_nvec = 1;
5899
5900         if (retries)
5901                 smb2_set_replay(server, &rqst);
5902
5903         rc = cifs_send_recv(xid, ses, server,
5904                             &rqst, &resp_buftype, flags, &rsp_iov);
5905         free_qfs_info_req(&iov);
5906         if (rc) {
5907                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5908                 goto posix_qfsinf_exit;
5909         }
5910         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5911
5912         info = (FILE_SYSTEM_POSIX_INFO *)(
5913                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5914         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5915                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5916                                sizeof(FILE_SYSTEM_POSIX_INFO));
5917         if (!rc)
5918                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5919
5920 posix_qfsinf_exit:
5921         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5922
5923         if (is_replayable_error(rc) &&
5924             smb2_should_replay(tcon, &retries, &cur_sleep))
5925                 goto replay_again;
5926
5927         return rc;
5928 }
5929
5930 int
5931 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5932               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5933 {
5934         struct smb_rqst rqst;
5935         struct smb2_query_info_rsp *rsp = NULL;
5936         struct kvec iov;
5937         struct kvec rsp_iov;
5938         int rc = 0;
5939         int resp_buftype;
5940         struct cifs_ses *ses = tcon->ses;
5941         struct TCP_Server_Info *server;
5942         struct smb2_fs_full_size_info *info = NULL;
5943         int flags = 0;
5944         int retries = 0, cur_sleep = 1;
5945
5946 replay_again:
5947         /* reinitialize for possible replay */
5948         flags = 0;
5949         server = cifs_pick_channel(ses);
5950
5951         rc = build_qfs_info_req(&iov, tcon, server,
5952                                 FS_FULL_SIZE_INFORMATION,
5953                                 sizeof(struct smb2_fs_full_size_info),
5954                                 persistent_fid, volatile_fid);
5955         if (rc)
5956                 return rc;
5957
5958         if (smb3_encryption_required(tcon))
5959                 flags |= CIFS_TRANSFORM_REQ;
5960
5961         memset(&rqst, 0, sizeof(struct smb_rqst));
5962         rqst.rq_iov = &iov;
5963         rqst.rq_nvec = 1;
5964
5965         if (retries)
5966                 smb2_set_replay(server, &rqst);
5967
5968         rc = cifs_send_recv(xid, ses, server,
5969                             &rqst, &resp_buftype, flags, &rsp_iov);
5970         free_qfs_info_req(&iov);
5971         if (rc) {
5972                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5973                 goto qfsinf_exit;
5974         }
5975         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5976
5977         info = (struct smb2_fs_full_size_info *)(
5978                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5979         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5980                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5981                                sizeof(struct smb2_fs_full_size_info));
5982         if (!rc)
5983                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5984
5985 qfsinf_exit:
5986         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5987
5988         if (is_replayable_error(rc) &&
5989             smb2_should_replay(tcon, &retries, &cur_sleep))
5990                 goto replay_again;
5991
5992         return rc;
5993 }
5994
5995 int
5996 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5997               u64 persistent_fid, u64 volatile_fid, int level)
5998 {
5999         struct smb_rqst rqst;
6000         struct smb2_query_info_rsp *rsp = NULL;
6001         struct kvec iov;
6002         struct kvec rsp_iov;
6003         int rc = 0;
6004         int resp_buftype, max_len, min_len;
6005         struct cifs_ses *ses = tcon->ses;
6006         struct TCP_Server_Info *server;
6007         unsigned int rsp_len, offset;
6008         int flags = 0;
6009         int retries = 0, cur_sleep = 1;
6010
6011 replay_again:
6012         /* reinitialize for possible replay */
6013         flags = 0;
6014         server = cifs_pick_channel(ses);
6015
6016         if (level == FS_DEVICE_INFORMATION) {
6017                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
6018                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
6019         } else if (level == FS_ATTRIBUTE_INFORMATION) {
6020                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
6021                 min_len = MIN_FS_ATTR_INFO_SIZE;
6022         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
6023                 max_len = sizeof(struct smb3_fs_ss_info);
6024                 min_len = sizeof(struct smb3_fs_ss_info);
6025         } else if (level == FS_VOLUME_INFORMATION) {
6026                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
6027                 min_len = sizeof(struct smb3_fs_vol_info);
6028         } else {
6029                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
6030                 return -EINVAL;
6031         }
6032
6033         rc = build_qfs_info_req(&iov, tcon, server,
6034                                 level, max_len,
6035                                 persistent_fid, volatile_fid);
6036         if (rc)
6037                 return rc;
6038
6039         if (smb3_encryption_required(tcon))
6040                 flags |= CIFS_TRANSFORM_REQ;
6041
6042         memset(&rqst, 0, sizeof(struct smb_rqst));
6043         rqst.rq_iov = &iov;
6044         rqst.rq_nvec = 1;
6045
6046         if (retries)
6047                 smb2_set_replay(server, &rqst);
6048
6049         rc = cifs_send_recv(xid, ses, server,
6050                             &rqst, &resp_buftype, flags, &rsp_iov);
6051         free_qfs_info_req(&iov);
6052         if (rc) {
6053                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
6054                 goto qfsattr_exit;
6055         }
6056         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
6057
6058         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
6059         offset = le16_to_cpu(rsp->OutputBufferOffset);
6060         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
6061         if (rc)
6062                 goto qfsattr_exit;
6063
6064         if (level == FS_ATTRIBUTE_INFORMATION)
6065                 memcpy(&tcon->fsAttrInfo, offset
6066                         + (char *)rsp, min_t(unsigned int,
6067                         rsp_len, max_len));
6068         else if (level == FS_DEVICE_INFORMATION)
6069                 memcpy(&tcon->fsDevInfo, offset
6070                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
6071         else if (level == FS_SECTOR_SIZE_INFORMATION) {
6072                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
6073                         (offset + (char *)rsp);
6074                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
6075                 tcon->perf_sector_size =
6076                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
6077         } else if (level == FS_VOLUME_INFORMATION) {
6078                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
6079                         (offset + (char *)rsp);
6080                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
6081                 tcon->vol_create_time = vol_info->VolumeCreationTime;
6082         }
6083
6084 qfsattr_exit:
6085         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
6086
6087         if (is_replayable_error(rc) &&
6088             smb2_should_replay(tcon, &retries, &cur_sleep))
6089                 goto replay_again;
6090
6091         return rc;
6092 }
6093
6094 int
6095 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
6096            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6097            const __u32 num_lock, struct smb2_lock_element *buf)
6098 {
6099         struct smb_rqst rqst;
6100         int rc = 0;
6101         struct smb2_lock_req *req = NULL;
6102         struct kvec iov[2];
6103         struct kvec rsp_iov;
6104         int resp_buf_type;
6105         unsigned int count;
6106         int flags = CIFS_NO_RSP_BUF;
6107         unsigned int total_len;
6108         struct TCP_Server_Info *server;
6109         int retries = 0, cur_sleep = 1;
6110
6111 replay_again:
6112         /* reinitialize for possible replay */
6113         flags = CIFS_NO_RSP_BUF;
6114         server = cifs_pick_channel(tcon->ses);
6115
6116         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
6117
6118         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
6119                                  (void **) &req, &total_len);
6120         if (rc)
6121                 return rc;
6122
6123         if (smb3_encryption_required(tcon))
6124                 flags |= CIFS_TRANSFORM_REQ;
6125
6126         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
6127         req->LockCount = cpu_to_le16(num_lock);
6128
6129         req->PersistentFileId = persist_fid;
6130         req->VolatileFileId = volatile_fid;
6131
6132         count = num_lock * sizeof(struct smb2_lock_element);
6133
6134         iov[0].iov_base = (char *)req;
6135         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
6136         iov[1].iov_base = (char *)buf;
6137         iov[1].iov_len = count;
6138
6139         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
6140
6141         memset(&rqst, 0, sizeof(struct smb_rqst));
6142         rqst.rq_iov = iov;
6143         rqst.rq_nvec = 2;
6144
6145         if (retries)
6146                 smb2_set_replay(server, &rqst);
6147
6148         rc = cifs_send_recv(xid, tcon->ses, server,
6149                             &rqst, &resp_buf_type, flags,
6150                             &rsp_iov);
6151         cifs_small_buf_release(req);
6152         if (rc) {
6153                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
6154                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
6155                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
6156                                     tcon->ses->Suid, rc);
6157         }
6158
6159         if (is_replayable_error(rc) &&
6160             smb2_should_replay(tcon, &retries, &cur_sleep))
6161                 goto replay_again;
6162
6163         return rc;
6164 }
6165
6166 int
6167 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
6168           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6169           const __u64 length, const __u64 offset, const __u32 lock_flags,
6170           const bool wait)
6171 {
6172         struct smb2_lock_element lock;
6173
6174         lock.Offset = cpu_to_le64(offset);
6175         lock.Length = cpu_to_le64(length);
6176         lock.Flags = cpu_to_le32(lock_flags);
6177         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
6178                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
6179
6180         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
6181 }
6182
6183 int
6184 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
6185                  __u8 *lease_key, const __le32 lease_state)
6186 {
6187         struct smb_rqst rqst;
6188         int rc;
6189         struct smb2_lease_ack *req = NULL;
6190         struct cifs_ses *ses = tcon->ses;
6191         int flags = CIFS_OBREAK_OP;
6192         unsigned int total_len;
6193         struct kvec iov[1];
6194         struct kvec rsp_iov;
6195         int resp_buf_type;
6196         __u64 *please_key_high;
6197         __u64 *please_key_low;
6198         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
6199
6200         cifs_dbg(FYI, "SMB2_lease_break\n");
6201         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
6202                                  (void **) &req, &total_len);
6203         if (rc)
6204                 return rc;
6205
6206         if (smb3_encryption_required(tcon))
6207                 flags |= CIFS_TRANSFORM_REQ;
6208
6209         req->hdr.CreditRequest = cpu_to_le16(1);
6210         req->StructureSize = cpu_to_le16(36);
6211         total_len += 12;
6212
6213         memcpy(req->LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
6214         req->LeaseState = lease_state;
6215
6216         flags |= CIFS_NO_RSP_BUF;
6217
6218         iov[0].iov_base = (char *)req;
6219         iov[0].iov_len = total_len;
6220
6221         memset(&rqst, 0, sizeof(struct smb_rqst));
6222         rqst.rq_iov = iov;
6223         rqst.rq_nvec = 1;
6224
6225         rc = cifs_send_recv(xid, ses, server,
6226                             &rqst, &resp_buf_type, flags, &rsp_iov);
6227         cifs_small_buf_release(req);
6228
6229         please_key_low = (__u64 *)lease_key;
6230         please_key_high = (__u64 *)(lease_key+8);
6231         if (rc) {
6232                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
6233                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
6234                         ses->Suid, *please_key_low, *please_key_high, rc);
6235                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
6236         } else
6237                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
6238                         ses->Suid, *please_key_low, *please_key_high);
6239
6240         return rc;
6241 }