fs/smb/client/smb2pdu.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  */
  12
  13  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  14  /* Note that there are handle based routines which must be                   */
  15  /* treated slightly differently for reconnection purposes since we never     */
  16  /* want to reuse a stale file handle and only the caller knows the file info */
  17
  18 #include <linux/fs.h>
  19 #include <linux/kernel.h>
  20 #include <linux/vfs.h>
  21 #include <linux/task_io_accounting_ops.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/uuid.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/xattr.h>
  26 #include "cifsglob.h"
  27 #include "cifsacl.h"
  28 #include "cifsproto.h"
  29 #include "smb2proto.h"
  30 #include "cifs_unicode.h"
  31 #include "cifs_debug.h"
  32 #include "ntlmssp.h"
  33 #include "smb2status.h"
  34 #include "smb2glob.h"
  35 #include "cifspdu.h"
  36 #include "cifs_spnego.h"
  37 #include "smbdirect.h"
  38 #include "trace.h"
  39 #ifdef CONFIG_CIFS_DFS_UPCALL
  40 #include "dfs_cache.h"
  41 #endif
  42 #include "cached_dir.h"
  43
  44 /*
  45  *  The following table defines the expected "StructureSize" of SMB2 requests
  46  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  47  *
  48  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  49  *  indexed by command in host byte order.
  50  */
  51 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  52         /* SMB2_NEGOTIATE */ 36,
  53         /* SMB2_SESSION_SETUP */ 25,
  54         /* SMB2_LOGOFF */ 4,
  55         /* SMB2_TREE_CONNECT */ 9,
  56         /* SMB2_TREE_DISCONNECT */ 4,
  57         /* SMB2_CREATE */ 57,
  58         /* SMB2_CLOSE */ 24,
  59         /* SMB2_FLUSH */ 24,
  60         /* SMB2_READ */ 49,
  61         /* SMB2_WRITE */ 49,
  62         /* SMB2_LOCK */ 48,
  63         /* SMB2_IOCTL */ 57,
  64         /* SMB2_CANCEL */ 4,
  65         /* SMB2_ECHO */ 4,
  66         /* SMB2_QUERY_DIRECTORY */ 33,
  67         /* SMB2_CHANGE_NOTIFY */ 32,
  68         /* SMB2_QUERY_INFO */ 41,
  69         /* SMB2_SET_INFO */ 33,
  70         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  71 };
  72
  73 int smb3_encryption_required(const struct cifs_tcon *tcon)
  74 {
  75         if (!tcon || !tcon->ses)
  76                 return 0;
  77         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  78             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  79                 return 1;
  80         if (tcon->seal &&
  81             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  82                 return 1;
  83         return 0;
  84 }
  85
  86 static void
  87 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
  88                   const struct cifs_tcon *tcon,
  89                   struct TCP_Server_Info *server)
  90 {
  91         struct smb3_hdr_req *smb3_hdr;
  92
  93         shdr->ProtocolId = SMB2_PROTO_NUMBER;
  94         shdr->StructureSize = cpu_to_le16(64);
  95         shdr->Command = smb2_cmd;
  96
  97         if (server) {
  98                 /* After reconnect SMB3 must set ChannelSequence on subsequent reqs */
  99                 if (server->dialect >= SMB30_PROT_ID) {
 100                         smb3_hdr = (struct smb3_hdr_req *)shdr;
 101                         /*
 102                          * if primary channel is not set yet, use default
 103                          * channel for chan sequence num
 104                          */
 105                         if (SERVER_IS_CHAN(server))
 106                                 smb3_hdr->ChannelSequence =
 107                                         cpu_to_le16(server->primary_server->channel_sequence_num);
 108                         else
 109                                 smb3_hdr->ChannelSequence =
 110                                         cpu_to_le16(server->channel_sequence_num);
 111                 }
 112                 spin_lock(&server->req_lock);
 113                 /* Request up to 10 credits but don't go over the limit. */
 114                 if (server->credits >= server->max_credits)
 115                         shdr->CreditRequest = cpu_to_le16(0);
 116                 else
 117                         shdr->CreditRequest = cpu_to_le16(
 118                                 min_t(int, server->max_credits -
 119                                                 server->credits, 10));
 120                 spin_unlock(&server->req_lock);
 121         } else {
 122                 shdr->CreditRequest = cpu_to_le16(2);
 123         }
 124         shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
 125
 126         if (!tcon)
 127                 goto out;
 128
 129         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 130         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 131         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 132                 shdr->CreditCharge = cpu_to_le16(1);
 133         /* else CreditCharge MBZ */
 134
 135         shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
 136         /* Uid is not converted */
 137         if (tcon->ses)
 138                 shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
 139
 140         /*
 141          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 142          * to pass the path on the Open SMB prefixed by \\server\share.
 143          * Not sure when we would need to do the augmented path (if ever) and
 144          * setting this flag breaks the SMB2 open operation since it is
 145          * illegal to send an empty path name (without \\server\share prefix)
 146          * when the DFS flag is set in the SMB open header. We could
 147          * consider setting the flag on all operations other than open
 148          * but it is safer to net set it for now.
 149          */
 150 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 151                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 152
 153         if (server && server->sign && !smb3_encryption_required(tcon))
 154                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 155 out:
 156         return;
 157 }
 158
 159 static int
 160 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 161                struct TCP_Server_Info *server, bool from_reconnect)
 162 {
 163         int rc = 0;
 164         struct nls_table *nls_codepage = NULL;
 165         struct cifs_ses *ses;
 166         int xid;
 167         struct TCP_Server_Info *pserver;
 168         unsigned int chan_index;
 169
 170         /*
 171          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 172          * check for tcp and smb session status done differently
 173          * for those three - in the calling routine.
 174          */
 175         if (tcon == NULL)
 176                 return 0;
 177
 178         /*
 179          * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in
 180          * cifs_tree_connect().
 181          */
 182         if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL)
 183                 return 0;
 184
 185         spin_lock(&tcon->tc_lock);
 186         if (tcon->status == TID_EXITING) {
 187                 /*
 188                  * only tree disconnect allowed when disconnecting ...
 189                  */
 190                 if (smb2_command != SMB2_TREE_DISCONNECT) {
 191                         spin_unlock(&tcon->tc_lock);
 192                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 193                                  smb2_command);
 194                         return -ENODEV;
 195                 }
 196         }
 197         spin_unlock(&tcon->tc_lock);
 198
 199         ses = tcon->ses;
 200         if (!ses)
 201                 return -EIO;
 202         spin_lock(&ses->ses_lock);
 203         if (ses->ses_status == SES_EXITING) {
 204                 spin_unlock(&ses->ses_lock);
 205                 return -EIO;
 206         }
 207         spin_unlock(&ses->ses_lock);
 208         if (!ses->server || !server)
 209                 return -EIO;
 210
 211         spin_lock(&server->srv_lock);
 212         if (server->tcpStatus == CifsNeedReconnect) {
 213                 /*
 214                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 215                  * here since they are implicitly done when session drops.
 216                  */
 217                 switch (smb2_command) {
 218                 /*
 219                  * BB Should we keep oplock break and add flush to exceptions?
 220                  */
 221                 case SMB2_TREE_DISCONNECT:
 222                 case SMB2_CANCEL:
 223                 case SMB2_CLOSE:
 224                 case SMB2_OPLOCK_BREAK:
 225                         spin_unlock(&server->srv_lock);
 226                         return -EAGAIN;
 227                 }
 228         }
 229
 230         /* if server is marked for termination, cifsd will cleanup */
 231         if (server->terminate) {
 232                 spin_unlock(&server->srv_lock);
 233                 return -EHOSTDOWN;
 234         }
 235         spin_unlock(&server->srv_lock);
 236
 237 again:
 238         rc = cifs_wait_for_server_reconnect(server, tcon->retry);
 239         if (rc)
 240                 return rc;
 241
 242         spin_lock(&ses->chan_lock);
 243         if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
 244                 spin_unlock(&ses->chan_lock);
 245                 return 0;
 246         }
 247         spin_unlock(&ses->chan_lock);
 248         cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
 249                  tcon->ses->chans_need_reconnect,
 250                  tcon->need_reconnect);
 251
 252         mutex_lock(&ses->session_mutex);
 253         /*
 254          * if this is called by delayed work, and the channel has been disabled
 255          * in parallel, the delayed work can continue to execute in parallel
 256          * there's a chance that this channel may not exist anymore
 257          */
 258         spin_lock(&server->srv_lock);
 259         if (server->tcpStatus == CifsExiting) {
 260                 spin_unlock(&server->srv_lock);
 261                 mutex_unlock(&ses->session_mutex);
 262                 rc = -EHOSTDOWN;
 263                 goto out;
 264         }
 265
 266         /*
 267          * Recheck after acquire mutex. If another thread is negotiating
 268          * and the server never sends an answer the socket will be closed
 269          * and tcpStatus set to reconnect.
 270          */
 271         if (server->tcpStatus == CifsNeedReconnect) {
 272                 spin_unlock(&server->srv_lock);
 273                 mutex_unlock(&ses->session_mutex);
 274
 275                 if (tcon->retry)
 276                         goto again;
 277
 278                 rc = -EHOSTDOWN;
 279                 goto out;
 280         }
 281         spin_unlock(&server->srv_lock);
 282
 283         nls_codepage = ses->local_nls;
 284
 285         /*
 286          * need to prevent multiple threads trying to simultaneously
 287          * reconnect the same SMB session
 288          */
 289         spin_lock(&ses->ses_lock);
 290         spin_lock(&ses->chan_lock);
 291         if (!cifs_chan_needs_reconnect(ses, server) &&
 292             ses->ses_status == SES_GOOD) {
 293                 spin_unlock(&ses->chan_lock);
 294                 spin_unlock(&ses->ses_lock);
 295                 /* this means that we only need to tree connect */
 296                 if (tcon->need_reconnect)
 297                         goto skip_sess_setup;
 298
 299                 mutex_unlock(&ses->session_mutex);
 300                 goto out;
 301         }
 302         spin_unlock(&ses->chan_lock);
 303         spin_unlock(&ses->ses_lock);
 304
 305         rc = cifs_negotiate_protocol(0, ses, server);
 306         if (!rc) {
 307                 /*
 308                  * if server stopped supporting multichannel
 309                  * and the first channel reconnected, disable all the others.
 310                  */
 311                 if (ses->chan_count > 1 &&
 312                     !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
 313                         if (SERVER_IS_CHAN(server)) {
 314                                 cifs_dbg(VFS, "server %s does not support " \
 315                                          "multichannel anymore. skipping secondary channel\n",
 316                                          ses->server->hostname);
 317
 318                                 spin_lock(&ses->chan_lock);
 319                                 chan_index = cifs_ses_get_chan_index(ses, server);
 320                                 if (chan_index == CIFS_INVAL_CHAN_INDEX) {
 321                                         spin_unlock(&ses->chan_lock);
 322                                         goto skip_terminate;
 323                                 }
 324
 325                                 ses->chans[chan_index].server = NULL;
 326                                 spin_unlock(&ses->chan_lock);
 327
 328                                 /*
 329                                  * the above reference of server by channel
 330                                  * needs to be dropped without holding chan_lock
 331                                  * as cifs_put_tcp_session takes a higher lock
 332                                  * i.e. cifs_tcp_ses_lock
 333                                  */
 334                                 cifs_put_tcp_session(server, from_reconnect);
 335
 336                                 server->terminate = true;
 337                                 cifs_signal_cifsd_for_reconnect(server, false);
 338
 339                                 /* mark primary server as needing reconnect */
 340                                 pserver = server->primary_server;
 341                                 cifs_signal_cifsd_for_reconnect(pserver, false);
 342
 343 skip_terminate:
 344                                 mutex_unlock(&ses->session_mutex);
 345                                 rc = -EHOSTDOWN;
 346                                 goto out;
 347                         } else {
 348                                 cifs_server_dbg(VFS, "does not support " \
 349                                          "multichannel anymore. disabling all other channels\n");
 350                                 cifs_disable_secondary_channels(ses);
 351                         }
 352                 }
 353
 354                 rc = cifs_setup_session(0, ses, server, nls_codepage);
 355                 if ((rc == -EACCES) && !tcon->retry) {
 356                         mutex_unlock(&ses->session_mutex);
 357                         rc = -EHOSTDOWN;
 358                         goto failed;
 359                 } else if (rc) {
 360                         mutex_unlock(&ses->session_mutex);
 361                         goto out;
 362                 }
 363         } else {
 364                 mutex_unlock(&ses->session_mutex);
 365                 goto out;
 366         }
 367
 368 skip_sess_setup:
 369         if (!tcon->need_reconnect) {
 370                 mutex_unlock(&ses->session_mutex);
 371                 goto out;
 372         }
 373         cifs_mark_open_files_invalid(tcon);
 374         if (tcon->use_persistent)
 375                 tcon->need_reopen_files = true;
 376
 377         rc = cifs_tree_connect(0, tcon, nls_codepage);
 378
 379         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 380         if (rc) {
 381                 /* If sess reconnected but tcon didn't, something strange ... */
 382                 mutex_unlock(&ses->session_mutex);
 383                 cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
 384                 goto out;
 385         }
 386
 387         if (!rc &&
 388             (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
 389                 mutex_unlock(&ses->session_mutex);
 390
 391                 /*
 392                  * query server network interfaces, in case they change
 393                  */
 394                 xid = get_xid();
 395                 rc = SMB3_request_interfaces(xid, tcon, false);
 396                 free_xid(xid);
 397
 398                 if (rc)
 399                         cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
 400                                  __func__, rc);
 401
 402                 if (ses->chan_max > ses->chan_count &&
 403                     !SERVER_IS_CHAN(server)) {
 404                         if (ses->chan_count == 1)
 405                                 cifs_server_dbg(VFS, "supports multichannel now\n");
 406
 407                         cifs_try_adding_channels(ses);
 408                 }
 409         } else {
 410                 mutex_unlock(&ses->session_mutex);
 411         }
 412
 413         if (smb2_command != SMB2_INTERNAL_CMD)
 414                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 415
 416         atomic_inc(&tconInfoReconnectCount);
 417 out:
 418         /*
 419          * Check if handle based operation so we know whether we can continue
 420          * or not without returning to caller to reset file handle.
 421          */
 422         /*
 423          * BB Is flush done by server on drop of tcp session? Should we special
 424          * case it and skip above?
 425          */
 426         switch (smb2_command) {
 427         case SMB2_FLUSH:
 428         case SMB2_READ:
 429         case SMB2_WRITE:
 430         case SMB2_LOCK:
 431         case SMB2_QUERY_DIRECTORY:
 432         case SMB2_CHANGE_NOTIFY:
 433         case SMB2_QUERY_INFO:
 434         case SMB2_SET_INFO:
 435                 rc = -EAGAIN;
 436         }
 437 failed:
 438         return rc;
 439 }
 440
 441 static void
 442 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 443                struct TCP_Server_Info *server,
 444                void *buf,
 445                unsigned int *total_len)
 446 {
 447         struct smb2_pdu *spdu = buf;
 448         /* lookup word count ie StructureSize from table */
 449         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 450
 451         /*
 452          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 453          * largest operations (Create)
 454          */
 455         memset(buf, 0, 256);
 456
 457         smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
 458         spdu->StructureSize2 = cpu_to_le16(parmsize);
 459
 460         *total_len = parmsize + sizeof(struct smb2_hdr);
 461 }
 462
 463 /*
 464  * Allocate and return pointer to an SMB request hdr, and set basic
 465  * SMB information in the SMB header. If the return code is zero, this
 466  * function must have filled in request_buf pointer.
 467  */
 468 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 469                                  struct TCP_Server_Info *server,
 470                                  void **request_buf, unsigned int *total_len)
 471 {
 472         /* BB eventually switch this to SMB2 specific small buf size */
 473         switch (smb2_command) {
 474         case SMB2_SET_INFO:
 475         case SMB2_QUERY_INFO:
 476                 *request_buf = cifs_buf_get();
 477                 break;
 478         default:
 479                 *request_buf = cifs_small_buf_get();
 480                 break;
 481         }
 482         if (*request_buf == NULL) {
 483                 /* BB should we add a retry in here if not a writepage? */
 484                 return -ENOMEM;
 485         }
 486
 487         fill_small_buf(smb2_command, tcon, server,
 488                        (struct smb2_hdr *)(*request_buf),
 489                        total_len);
 490
 491         if (tcon != NULL) {
 492                 uint16_t com_code = le16_to_cpu(smb2_command);
 493                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 494                 cifs_stats_inc(&tcon->num_smbs_sent);
 495         }
 496
 497         return 0;
 498 }
 499
 500 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 501                                struct TCP_Server_Info *server,
 502                                void **request_buf, unsigned int *total_len)
 503 {
 504         int rc;
 505
 506         rc = smb2_reconnect(smb2_command, tcon, server, false);
 507         if (rc)
 508                 return rc;
 509
 510         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 511                                      total_len);
 512 }
 513
 514 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 515                                struct TCP_Server_Info *server,
 516                                void **request_buf, unsigned int *total_len)
 517 {
 518         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 519         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 520                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 521                                              request_buf, total_len);
 522         }
 523         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 524                                    request_buf, total_len);
 525 }
 526
 527 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 528
 529 static void
 530 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 531 {
 532         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 533         pneg_ctxt->DataLength = cpu_to_le16(38);
 534         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 535         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 536         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 537         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 538 }
 539
 540 static void
 541 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 542 {
 543         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 544         pneg_ctxt->DataLength =
 545                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 546                           - sizeof(struct smb2_neg_context));
 547         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 548         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 549         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 550         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 551 }
 552
 553 static unsigned int
 554 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
 555 {
 556         unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
 557         unsigned short num_algs = 1; /* number of signing algorithms sent */
 558
 559         pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
 560         /*
 561          * Context Data length must be rounded to multiple of 8 for some servers
 562          */
 563         pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
 564                                             sizeof(struct smb2_neg_context) +
 565                                             (num_algs * sizeof(u16)), 8));
 566         pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
 567         pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
 568
 569         ctxt_len += sizeof(__le16) * num_algs;
 570         ctxt_len = ALIGN(ctxt_len, 8);
 571         return ctxt_len;
 572         /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
 573 }
 574
 575 static void
 576 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 577 {
 578         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 579         if (require_gcm_256) {
 580                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 581                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 582                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 583         } else if (enable_gcm_256) {
 584                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 585                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 586                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 587                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 588                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 589         } else {
 590                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 591                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 592                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 593                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 594         }
 595 }
 596
 597 static unsigned int
 598 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 599 {
 600         struct nls_table *cp = load_nls_default();
 601
 602         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 603
 604         /* copy up to max of first 100 bytes of server name to NetName field */
 605         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 606         /* context size is DataLength + minimal smb2_neg_context */
 607         return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
 608 }
 609
 610 static void
 611 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 612 {
 613         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 614         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 615         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 616         pneg_ctxt->Name[0] = 0x93;
 617         pneg_ctxt->Name[1] = 0xAD;
 618         pneg_ctxt->Name[2] = 0x25;
 619         pneg_ctxt->Name[3] = 0x50;
 620         pneg_ctxt->Name[4] = 0x9C;
 621         pneg_ctxt->Name[5] = 0xB4;
 622         pneg_ctxt->Name[6] = 0x11;
 623         pneg_ctxt->Name[7] = 0xE7;
 624         pneg_ctxt->Name[8] = 0xB4;
 625         pneg_ctxt->Name[9] = 0x23;
 626         pneg_ctxt->Name[10] = 0x83;
 627         pneg_ctxt->Name[11] = 0xDE;
 628         pneg_ctxt->Name[12] = 0x96;
 629         pneg_ctxt->Name[13] = 0x8B;
 630         pneg_ctxt->Name[14] = 0xCD;
 631         pneg_ctxt->Name[15] = 0x7C;
 632 }
 633
 634 static void
 635 assemble_neg_contexts(struct smb2_negotiate_req *req,
 636                       struct TCP_Server_Info *server, unsigned int *total_len)
 637 {
 638         unsigned int ctxt_len, neg_context_count;
 639         struct TCP_Server_Info *pserver;
 640         char *pneg_ctxt;
 641         char *hostname;
 642
 643         if (*total_len > 200) {
 644                 /* In case length corrupted don't want to overrun smb buffer */
 645                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 646                 return;
 647         }
 648
 649         /*
 650          * round up total_len of fixed part of SMB3 negotiate request to 8
 651          * byte boundary before adding negotiate contexts
 652          */
 653         *total_len = ALIGN(*total_len, 8);
 654
 655         pneg_ctxt = (*total_len) + (char *)req;
 656         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 657
 658         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 659         ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
 660         *total_len += ctxt_len;
 661         pneg_ctxt += ctxt_len;
 662
 663         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 664         ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
 665         *total_len += ctxt_len;
 666         pneg_ctxt += ctxt_len;
 667
 668         /*
 669          * secondary channels don't have the hostname field populated
 670          * use the hostname field in the primary channel instead
 671          */
 672         pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
 673         cifs_server_lock(pserver);
 674         hostname = pserver->hostname;
 675         if (hostname && (hostname[0] != 0)) {
 676                 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 677                                               hostname);
 678                 *total_len += ctxt_len;
 679                 pneg_ctxt += ctxt_len;
 680                 neg_context_count = 3;
 681         } else
 682                 neg_context_count = 2;
 683         cifs_server_unlock(pserver);
 684
 685         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 686         *total_len += sizeof(struct smb2_posix_neg_context);
 687         pneg_ctxt += sizeof(struct smb2_posix_neg_context);
 688         neg_context_count++;
 689
 690         if (server->compress_algorithm) {
 691                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 692                                 pneg_ctxt);
 693                 ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
 694                 *total_len += ctxt_len;
 695                 pneg_ctxt += ctxt_len;
 696                 neg_context_count++;
 697         }
 698
 699         if (enable_negotiate_signing) {
 700                 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
 701                                 pneg_ctxt);
 702                 *total_len += ctxt_len;
 703                 pneg_ctxt += ctxt_len;
 704                 neg_context_count++;
 705         }
 706
 707         /* check for and add transport_capabilities and signing capabilities */
 708         req->NegotiateContextCount = cpu_to_le16(neg_context_count);
 709
 710 }
 711
 712 /* If invalid preauth context warn but use what we requested, SHA-512 */
 713 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 714 {
 715         unsigned int len = le16_to_cpu(ctxt->DataLength);
 716
 717         /*
 718          * Caller checked that DataLength remains within SMB boundary. We still
 719          * need to confirm that one HashAlgorithms member is accounted for.
 720          */
 721         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 722                 pr_warn_once("server sent bad preauth context\n");
 723                 return;
 724         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 725                 pr_warn_once("server sent invalid SaltLength\n");
 726                 return;
 727         }
 728         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 729                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 730         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 731                 pr_warn_once("unknown SMB3 hash algorithm\n");
 732 }
 733
 734 static void decode_compress_ctx(struct TCP_Server_Info *server,
 735                          struct smb2_compression_capabilities_context *ctxt)
 736 {
 737         unsigned int len = le16_to_cpu(ctxt->DataLength);
 738
 739         /*
 740          * Caller checked that DataLength remains within SMB boundary. We still
 741          * need to confirm that one CompressionAlgorithms member is accounted
 742          * for.
 743          */
 744         if (len < 10) {
 745                 pr_warn_once("server sent bad compression cntxt\n");
 746                 return;
 747         }
 748         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 749                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 750                 return;
 751         }
 752         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 753                 pr_warn_once("unknown compression algorithm\n");
 754                 return;
 755         }
 756         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 757 }
 758
 759 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 760                               struct smb2_encryption_neg_context *ctxt)
 761 {
 762         unsigned int len = le16_to_cpu(ctxt->DataLength);
 763
 764         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 765         /*
 766          * Caller checked that DataLength remains within SMB boundary. We still
 767          * need to confirm that one Cipher flexible array member is accounted
 768          * for.
 769          */
 770         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 771                 pr_warn_once("server sent bad crypto ctxt len\n");
 772                 return -EINVAL;
 773         }
 774
 775         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 776                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 777                 return -EINVAL;
 778         }
 779         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 780         if (require_gcm_256) {
 781                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 782                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 783                         return -EOPNOTSUPP;
 784                 }
 785         } else if (ctxt->Ciphers[0] == 0) {
 786                 /*
 787                  * e.g. if server only supported AES256_CCM (very unlikely)
 788                  * or server supported no encryption types or had all disabled.
 789                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 790                  * in which mount requested encryption ("seal") checks later
 791                  * on during tree connection will return proper rc, but if
 792                  * seal not requested by client, since server is allowed to
 793                  * return 0 to indicate no supported cipher, we can't fail here
 794                  */
 795                 server->cipher_type = 0;
 796                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 797                 pr_warn_once("Server does not support requested encryption types\n");
 798                 return 0;
 799         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 800                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 801                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 802                 /* server returned a cipher we didn't ask for */
 803                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 804                 return -EINVAL;
 805         }
 806         server->cipher_type = ctxt->Ciphers[0];
 807         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 808         return 0;
 809 }
 810
 811 static void decode_signing_ctx(struct TCP_Server_Info *server,
 812                                struct smb2_signing_capabilities *pctxt)
 813 {
 814         unsigned int len = le16_to_cpu(pctxt->DataLength);
 815
 816         /*
 817          * Caller checked that DataLength remains within SMB boundary. We still
 818          * need to confirm that one SigningAlgorithms flexible array member is
 819          * accounted for.
 820          */
 821         if ((len < 4) || (len > 16)) {
 822                 pr_warn_once("server sent bad signing negcontext\n");
 823                 return;
 824         }
 825         if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
 826                 pr_warn_once("Invalid signing algorithm count\n");
 827                 return;
 828         }
 829         if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
 830                 pr_warn_once("unknown signing algorithm\n");
 831                 return;
 832         }
 833
 834         server->signing_negotiated = true;
 835         server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
 836         cifs_dbg(FYI, "signing algorithm %d chosen\n",
 837                      server->signing_algorithm);
 838 }
 839
 840
 841 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 842                                      struct TCP_Server_Info *server,
 843                                      unsigned int len_of_smb)
 844 {
 845         struct smb2_neg_context *pctx;
 846         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 847         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 848         unsigned int len_of_ctxts, i;
 849         int rc = 0;
 850
 851         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 852         if (len_of_smb <= offset) {
 853                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 854                 return -EINVAL;
 855         }
 856
 857         len_of_ctxts = len_of_smb - offset;
 858
 859         for (i = 0; i < ctxt_cnt; i++) {
 860                 int clen;
 861                 /* check that offset is not beyond end of SMB */
 862                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 863                         break;
 864
 865                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 866                 clen = sizeof(struct smb2_neg_context)
 867                         + le16_to_cpu(pctx->DataLength);
 868                 /*
 869                  * 2.2.4 SMB2 NEGOTIATE Response
 870                  * Subsequent negotiate contexts MUST appear at the first 8-byte
 871                  * aligned offset following the previous negotiate context.
 872                  */
 873                 if (i + 1 != ctxt_cnt)
 874                         clen = ALIGN(clen, 8);
 875                 if (clen > len_of_ctxts)
 876                         break;
 877
 878                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 879                         decode_preauth_context(
 880                                 (struct smb2_preauth_neg_context *)pctx);
 881                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 882                         rc = decode_encrypt_ctx(server,
 883                                 (struct smb2_encryption_neg_context *)pctx);
 884                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 885                         decode_compress_ctx(server,
 886                                 (struct smb2_compression_capabilities_context *)pctx);
 887                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 888                         server->posix_ext_supported = true;
 889                 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
 890                         decode_signing_ctx(server,
 891                                 (struct smb2_signing_capabilities *)pctx);
 892                 else
 893                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 894                                 le16_to_cpu(pctx->ContextType));
 895                 if (rc)
 896                         break;
 897
 898                 offset += clen;
 899                 len_of_ctxts -= clen;
 900         }
 901         return rc;
 902 }
 903
 904 static struct create_posix *
 905 create_posix_buf(umode_t mode)
 906 {
 907         struct create_posix *buf;
 908
 909         buf = kzalloc(sizeof(struct create_posix),
 910                         GFP_KERNEL);
 911         if (!buf)
 912                 return NULL;
 913
 914         buf->ccontext.DataOffset =
 915                 cpu_to_le16(offsetof(struct create_posix, Mode));
 916         buf->ccontext.DataLength = cpu_to_le32(4);
 917         buf->ccontext.NameOffset =
 918                 cpu_to_le16(offsetof(struct create_posix, Name));
 919         buf->ccontext.NameLength = cpu_to_le16(16);
 920
 921         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 922         buf->Name[0] = 0x93;
 923         buf->Name[1] = 0xAD;
 924         buf->Name[2] = 0x25;
 925         buf->Name[3] = 0x50;
 926         buf->Name[4] = 0x9C;
 927         buf->Name[5] = 0xB4;
 928         buf->Name[6] = 0x11;
 929         buf->Name[7] = 0xE7;
 930         buf->Name[8] = 0xB4;
 931         buf->Name[9] = 0x23;
 932         buf->Name[10] = 0x83;
 933         buf->Name[11] = 0xDE;
 934         buf->Name[12] = 0x96;
 935         buf->Name[13] = 0x8B;
 936         buf->Name[14] = 0xCD;
 937         buf->Name[15] = 0x7C;
 938         buf->Mode = cpu_to_le32(mode);
 939         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 940         return buf;
 941 }
 942
 943 static int
 944 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 945 {
 946         unsigned int num = *num_iovec;
 947
 948         iov[num].iov_base = create_posix_buf(mode);
 949         if (mode == ACL_NO_MODE)
 950                 cifs_dbg(FYI, "%s: no mode\n", __func__);
 951         if (iov[num].iov_base == NULL)
 952                 return -ENOMEM;
 953         iov[num].iov_len = sizeof(struct create_posix);
 954         *num_iovec = num + 1;
 955         return 0;
 956 }
 957
 958
 959 /*
 960  *
 961  *      SMB2 Worker functions follow:
 962  *
 963  *      The general structure of the worker functions is:
 964  *      1) Call smb2_init (assembles SMB2 header)
 965  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 966  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 967  *      4) Decode SMB2 command specific fields in the fixed length area
 968  *      5) Decode variable length data area (if any for this SMB2 command type)
 969  *      6) Call free smb buffer
 970  *      7) return
 971  *
 972  */
 973
 974 int
 975 SMB2_negotiate(const unsigned int xid,
 976                struct cifs_ses *ses,
 977                struct TCP_Server_Info *server)
 978 {
 979         struct smb_rqst rqst;
 980         struct smb2_negotiate_req *req;
 981         struct smb2_negotiate_rsp *rsp;
 982         struct kvec iov[1];
 983         struct kvec rsp_iov;
 984         int rc;
 985         int resp_buftype;
 986         int blob_offset, blob_length;
 987         char *security_blob;
 988         int flags = CIFS_NEG_OP;
 989         unsigned int total_len;
 990
 991         cifs_dbg(FYI, "Negotiate protocol\n");
 992
 993         if (!server) {
 994                 WARN(1, "%s: server is NULL!\n", __func__);
 995                 return -EIO;
 996         }
 997
 998         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 999                                  (void **) &req, &total_len);
1000         if (rc)
1001                 return rc;
1002
1003         req->hdr.SessionId = 0;
1004
1005         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1006         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1007
1008         if (strcmp(server->vals->version_string,
1009                    SMB3ANY_VERSION_STRING) == 0) {
1010                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1011                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1012                 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1013                 req->DialectCount = cpu_to_le16(3);
1014                 total_len += 6;
1015         } else if (strcmp(server->vals->version_string,
1016                    SMBDEFAULT_VERSION_STRING) == 0) {
1017                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1018                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1019                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1020                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1021                 req->DialectCount = cpu_to_le16(4);
1022                 total_len += 8;
1023         } else {
1024                 /* otherwise send specific dialect */
1025                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
1026                 req->DialectCount = cpu_to_le16(1);
1027                 total_len += 2;
1028         }
1029
1030         /* only one of SMB2 signing flags may be set in SMB2 request */
1031         if (ses->sign)
1032                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1033         else if (global_secflags & CIFSSEC_MAY_SIGN)
1034                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1035         else
1036                 req->SecurityMode = 0;
1037
1038         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
1039         if (ses->chan_max > 1)
1040                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1041
1042         /* ClientGUID must be zero for SMB2.02 dialect */
1043         if (server->vals->protocol_id == SMB20_PROT_ID)
1044                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
1045         else {
1046                 memcpy(req->ClientGUID, server->client_guid,
1047                         SMB2_CLIENT_GUID_SIZE);
1048                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
1049                     (strcmp(server->vals->version_string,
1050                      SMB3ANY_VERSION_STRING) == 0) ||
1051                     (strcmp(server->vals->version_string,
1052                      SMBDEFAULT_VERSION_STRING) == 0))
1053                         assemble_neg_contexts(req, server, &total_len);
1054         }
1055         iov[0].iov_base = (char *)req;
1056         iov[0].iov_len = total_len;
1057
1058         memset(&rqst, 0, sizeof(struct smb_rqst));
1059         rqst.rq_iov = iov;
1060         rqst.rq_nvec = 1;
1061
1062         rc = cifs_send_recv(xid, ses, server,
1063                             &rqst, &resp_buftype, flags, &rsp_iov);
1064         cifs_small_buf_release(req);
1065         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
1066         /*
1067          * No tcon so can't do
1068          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1069          */
1070         if (rc == -EOPNOTSUPP) {
1071                 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");
1072                 goto neg_exit;
1073         } else if (rc != 0)
1074                 goto neg_exit;
1075
1076         rc = -EIO;
1077         if (strcmp(server->vals->version_string,
1078                    SMB3ANY_VERSION_STRING) == 0) {
1079                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1080                         cifs_server_dbg(VFS,
1081                                 "SMB2 dialect returned but not requested\n");
1082                         goto neg_exit;
1083                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1084                         cifs_server_dbg(VFS,
1085                                 "SMB2.1 dialect returned but not requested\n");
1086                         goto neg_exit;
1087                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1088                         /* ops set to 3.0 by default for default so update */
1089                         server->ops = &smb311_operations;
1090                         server->vals = &smb311_values;
1091                 }
1092         } else if (strcmp(server->vals->version_string,
1093                    SMBDEFAULT_VERSION_STRING) == 0) {
1094                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1095                         cifs_server_dbg(VFS,
1096                                 "SMB2 dialect returned but not requested\n");
1097                         goto neg_exit;
1098                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1099                         /* ops set to 3.0 by default for default so update */
1100                         server->ops = &smb21_operations;
1101                         server->vals = &smb21_values;
1102                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1103                         server->ops = &smb311_operations;
1104                         server->vals = &smb311_values;
1105                 }
1106         } else if (le16_to_cpu(rsp->DialectRevision) !=
1107                                 server->vals->protocol_id) {
1108                 /* if requested single dialect ensure returned dialect matched */
1109                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
1110                                 le16_to_cpu(rsp->DialectRevision));
1111                 goto neg_exit;
1112         }
1113
1114         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1115
1116         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
1117                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1118         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
1119                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1120         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
1121                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1122         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
1123                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1124         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
1125                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1126         else {
1127                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1128                                 le16_to_cpu(rsp->DialectRevision));
1129                 goto neg_exit;
1130         }
1131
1132         rc = 0;
1133         server->dialect = le16_to_cpu(rsp->DialectRevision);
1134
1135         /*
1136          * Keep a copy of the hash after negprot. This hash will be
1137          * the starting hash value for all sessions made from this
1138          * server.
1139          */
1140         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1141                SMB2_PREAUTH_HASH_SIZE);
1142
1143         /* SMB2 only has an extended negflavor */
1144         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1145         /* set it to the maximum buffer size value we can send with 1 credit */
1146         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1147                                SMB2_MAX_BUFFER_SIZE);
1148         server->max_read = le32_to_cpu(rsp->MaxReadSize);
1149         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1150         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1151         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1152                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1153                                 server->sec_mode);
1154         server->capabilities = le32_to_cpu(rsp->Capabilities);
1155         /* Internal types */
1156         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1157
1158         /*
1159          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1160          * Set the cipher type manually.
1161          */
1162         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1163                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1164
1165         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1166                                                (struct smb2_hdr *)rsp);
1167         /*
1168          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1169          * for us will be
1170          *      ses->sectype = RawNTLMSSP;
1171          * but for time being this is our only auth choice so doesn't matter.
1172          * We just found a server which sets blob length to zero expecting raw.
1173          */
1174         if (blob_length == 0) {
1175                 cifs_dbg(FYI, "missing security blob on negprot\n");
1176                 server->sec_ntlmssp = true;
1177         }
1178
1179         rc = cifs_enable_signing(server, ses->sign);
1180         if (rc)
1181                 goto neg_exit;
1182         if (blob_length) {
1183                 rc = decode_negTokenInit(security_blob, blob_length, server);
1184                 if (rc == 1)
1185                         rc = 0;
1186                 else if (rc == 0)
1187                         rc = -EIO;
1188         }
1189
1190         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1191                 if (rsp->NegotiateContextCount)
1192                         rc = smb311_decode_neg_context(rsp, server,
1193                                                        rsp_iov.iov_len);
1194                 else
1195                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1196         }
1197 neg_exit:
1198         free_rsp_buf(resp_buftype, rsp);
1199         return rc;
1200 }
1201
1202 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1203 {
1204         int rc;
1205         struct validate_negotiate_info_req *pneg_inbuf;
1206         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1207         u32 rsplen;
1208         u32 inbuflen; /* max of 4 dialects */
1209         struct TCP_Server_Info *server = tcon->ses->server;
1210
1211         cifs_dbg(FYI, "validate negotiate\n");
1212
1213         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1214         if (server->dialect == SMB311_PROT_ID)
1215                 return 0;
1216
1217         /*
1218          * validation ioctl must be signed, so no point sending this if we
1219          * can not sign it (ie are not known user).  Even if signing is not
1220          * required (enabled but not negotiated), in those cases we selectively
1221          * sign just this, the first and only signed request on a connection.
1222          * Having validation of negotiate info  helps reduce attack vectors.
1223          */
1224         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1225                 return 0; /* validation requires signing */
1226
1227         if (tcon->ses->user_name == NULL) {
1228                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1229                 return 0; /* validation requires signing */
1230         }
1231
1232         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1233                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1234
1235         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1236         if (!pneg_inbuf)
1237                 return -ENOMEM;
1238
1239         pneg_inbuf->Capabilities =
1240                         cpu_to_le32(server->vals->req_capabilities);
1241         if (tcon->ses->chan_max > 1)
1242                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1243
1244         memcpy(pneg_inbuf->Guid, server->client_guid,
1245                                         SMB2_CLIENT_GUID_SIZE);
1246
1247         if (tcon->ses->sign)
1248                 pneg_inbuf->SecurityMode =
1249                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1250         else if (global_secflags & CIFSSEC_MAY_SIGN)
1251                 pneg_inbuf->SecurityMode =
1252                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1253         else
1254                 pneg_inbuf->SecurityMode = 0;
1255
1256
1257         if (strcmp(server->vals->version_string,
1258                 SMB3ANY_VERSION_STRING) == 0) {
1259                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1260                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1261                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1262                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1263                 /* SMB 2.1 not included so subtract one dialect from len */
1264                 inbuflen = sizeof(*pneg_inbuf) -
1265                                 (sizeof(pneg_inbuf->Dialects[0]));
1266         } else if (strcmp(server->vals->version_string,
1267                 SMBDEFAULT_VERSION_STRING) == 0) {
1268                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1269                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1270                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1271                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1272                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1273                 /* structure is big enough for 4 dialects */
1274                 inbuflen = sizeof(*pneg_inbuf);
1275         } else {
1276                 /* otherwise specific dialect was requested */
1277                 pneg_inbuf->Dialects[0] =
1278                         cpu_to_le16(server->vals->protocol_id);
1279                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1280                 /* structure is big enough for 4 dialects, sending only 1 */
1281                 inbuflen = sizeof(*pneg_inbuf) -
1282                                 sizeof(pneg_inbuf->Dialects[0]) * 3;
1283         }
1284
1285         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1286                 FSCTL_VALIDATE_NEGOTIATE_INFO,
1287                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1288                 (char **)&pneg_rsp, &rsplen);
1289         if (rc == -EOPNOTSUPP) {
1290                 /*
1291                  * Old Windows versions or Netapp SMB server can return
1292                  * not supported error. Client should accept it.
1293                  */
1294                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1295                 rc = 0;
1296                 goto out_free_inbuf;
1297         } else if (rc != 0) {
1298                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1299                               rc);
1300                 rc = -EIO;
1301                 goto out_free_inbuf;
1302         }
1303
1304         rc = -EIO;
1305         if (rsplen != sizeof(*pneg_rsp)) {
1306                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1307                               rsplen);
1308
1309                 /* relax check since Mac returns max bufsize allowed on ioctl */
1310                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1311                         goto out_free_rsp;
1312         }
1313
1314         /* check validate negotiate info response matches what we got earlier */
1315         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1316                 goto vneg_out;
1317
1318         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1319                 goto vneg_out;
1320
1321         /* do not validate server guid because not saved at negprot time yet */
1322
1323         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1324               SMB2_LARGE_FILES) != server->capabilities)
1325                 goto vneg_out;
1326
1327         /* validate negotiate successful */
1328         rc = 0;
1329         cifs_dbg(FYI, "validate negotiate info successful\n");
1330         goto out_free_rsp;
1331
1332 vneg_out:
1333         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1334 out_free_rsp:
1335         kfree(pneg_rsp);
1336 out_free_inbuf:
1337         kfree(pneg_inbuf);
1338         return rc;
1339 }
1340
1341 enum securityEnum
1342 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1343 {
1344         switch (requested) {
1345         case Kerberos:
1346         case RawNTLMSSP:
1347                 return requested;
1348         case NTLMv2:
1349                 return RawNTLMSSP;
1350         case Unspecified:
1351                 if (server->sec_ntlmssp &&
1352                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1353                         return RawNTLMSSP;
1354                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1355                         (global_secflags & CIFSSEC_MAY_KRB5))
1356                         return Kerberos;
1357                 fallthrough;
1358         default:
1359                 return Unspecified;
1360         }
1361 }
1362
1363 struct SMB2_sess_data {
1364         unsigned int xid;
1365         struct cifs_ses *ses;
1366         struct TCP_Server_Info *server;
1367         struct nls_table *nls_cp;
1368         void (*func)(struct SMB2_sess_data *);
1369         int result;
1370         u64 previous_session;
1371
1372         /* we will send the SMB in three pieces:
1373          * a fixed length beginning part, an optional
1374          * SPNEGO blob (which can be zero length), and a
1375          * last part which will include the strings
1376          * and rest of bcc area. This allows us to avoid
1377          * a large buffer 17K allocation
1378          */
1379         int buf0_type;
1380         struct kvec iov[2];
1381 };
1382
1383 static int
1384 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1385 {
1386         int rc;
1387         struct cifs_ses *ses = sess_data->ses;
1388         struct TCP_Server_Info *server = sess_data->server;
1389         struct smb2_sess_setup_req *req;
1390         unsigned int total_len;
1391         bool is_binding = false;
1392
1393         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1394                                  (void **) &req,
1395                                  &total_len);
1396         if (rc)
1397                 return rc;
1398
1399         spin_lock(&ses->ses_lock);
1400         is_binding = (ses->ses_status == SES_GOOD);
1401         spin_unlock(&ses->ses_lock);
1402
1403         if (is_binding) {
1404                 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1405                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1406                 req->PreviousSessionId = 0;
1407                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1408                 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1409         } else {
1410                 /* First session, not a reauthenticate */
1411                 req->hdr.SessionId = 0;
1412                 /*
1413                  * if reconnect, we need to send previous sess id
1414                  * otherwise it is 0
1415                  */
1416                 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1417                 req->Flags = 0; /* MBZ */
1418                 cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1419                          sess_data->previous_session);
1420         }
1421
1422         /* enough to enable echos and oplocks and one max size write */
1423         if (server->credits >= server->max_credits)
1424                 req->hdr.CreditRequest = cpu_to_le16(0);
1425         else
1426                 req->hdr.CreditRequest = cpu_to_le16(
1427                         min_t(int, server->max_credits -
1428                               server->credits, 130));
1429
1430         /* only one of SMB2 signing flags may be set in SMB2 request */
1431         if (server->sign)
1432                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1433         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1434                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1435         else
1436                 req->SecurityMode = 0;
1437
1438 #ifdef CONFIG_CIFS_DFS_UPCALL
1439         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1440 #else
1441         req->Capabilities = 0;
1442 #endif /* DFS_UPCALL */
1443
1444         req->Channel = 0; /* MBZ */
1445
1446         sess_data->iov[0].iov_base = (char *)req;
1447         /* 1 for pad */
1448         sess_data->iov[0].iov_len = total_len - 1;
1449         /*
1450          * This variable will be used to clear the buffer
1451          * allocated above in case of any error in the calling function.
1452          */
1453         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1454
1455         return 0;
1456 }
1457
1458 static void
1459 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1460 {
1461         struct kvec *iov = sess_data->iov;
1462
1463         /* iov[1] is already freed by caller */
1464         if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1465                 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1466
1467         free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1468         sess_data->buf0_type = CIFS_NO_BUFFER;
1469 }
1470
1471 static int
1472 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1473 {
1474         int rc;
1475         struct smb_rqst rqst;
1476         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1477         struct kvec rsp_iov = { NULL, 0 };
1478
1479         /* Testing shows that buffer offset must be at location of Buffer[0] */
1480         req->SecurityBufferOffset =
1481                 cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1482         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1483
1484         memset(&rqst, 0, sizeof(struct smb_rqst));
1485         rqst.rq_iov = sess_data->iov;
1486         rqst.rq_nvec = 2;
1487
1488         /* BB add code to build os and lm fields */
1489         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1490                             sess_data->server,
1491                             &rqst,
1492                             &sess_data->buf0_type,
1493                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1494         cifs_small_buf_release(sess_data->iov[0].iov_base);
1495         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1496
1497         return rc;
1498 }
1499
1500 static int
1501 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1502 {
1503         int rc = 0;
1504         struct cifs_ses *ses = sess_data->ses;
1505         struct TCP_Server_Info *server = sess_data->server;
1506
1507         cifs_server_lock(server);
1508         if (server->ops->generate_signingkey) {
1509                 rc = server->ops->generate_signingkey(ses, server);
1510                 if (rc) {
1511                         cifs_dbg(FYI,
1512                                 "SMB3 session key generation failed\n");
1513                         cifs_server_unlock(server);
1514                         return rc;
1515                 }
1516         }
1517         if (!server->session_estab) {
1518                 server->sequence_number = 0x2;
1519                 server->session_estab = true;
1520         }
1521         cifs_server_unlock(server);
1522
1523         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1524         return rc;
1525 }
1526
1527 #ifdef CONFIG_CIFS_UPCALL
1528 static void
1529 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1530 {
1531         int rc;
1532         struct cifs_ses *ses = sess_data->ses;
1533         struct TCP_Server_Info *server = sess_data->server;
1534         struct cifs_spnego_msg *msg;
1535         struct key *spnego_key = NULL;
1536         struct smb2_sess_setup_rsp *rsp = NULL;
1537         bool is_binding = false;
1538
1539         rc = SMB2_sess_alloc_buffer(sess_data);
1540         if (rc)
1541                 goto out;
1542
1543         spnego_key = cifs_get_spnego_key(ses, server);
1544         if (IS_ERR(spnego_key)) {
1545                 rc = PTR_ERR(spnego_key);
1546                 if (rc == -ENOKEY)
1547                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1548                 spnego_key = NULL;
1549                 goto out;
1550         }
1551
1552         msg = spnego_key->payload.data[0];
1553         /*
1554          * check version field to make sure that cifs.upcall is
1555          * sending us a response in an expected form
1556          */
1557         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1558                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1559                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1560                 rc = -EKEYREJECTED;
1561                 goto out_put_spnego_key;
1562         }
1563
1564         spin_lock(&ses->ses_lock);
1565         is_binding = (ses->ses_status == SES_GOOD);
1566         spin_unlock(&ses->ses_lock);
1567
1568         /* keep session key if binding */
1569         if (!is_binding) {
1570                 kfree_sensitive(ses->auth_key.response);
1571                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1572                                                  GFP_KERNEL);
1573                 if (!ses->auth_key.response) {
1574                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1575                                  msg->sesskey_len);
1576                         rc = -ENOMEM;
1577                         goto out_put_spnego_key;
1578                 }
1579                 ses->auth_key.len = msg->sesskey_len;
1580         }
1581
1582         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1583         sess_data->iov[1].iov_len = msg->secblob_len;
1584
1585         rc = SMB2_sess_sendreceive(sess_data);
1586         if (rc)
1587                 goto out_put_spnego_key;
1588
1589         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1590         /* keep session id and flags if binding */
1591         if (!is_binding) {
1592                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1593                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1594         }
1595
1596         rc = SMB2_sess_establish_session(sess_data);
1597 out_put_spnego_key:
1598         key_invalidate(spnego_key);
1599         key_put(spnego_key);
1600         if (rc) {
1601                 kfree_sensitive(ses->auth_key.response);
1602                 ses->auth_key.response = NULL;
1603                 ses->auth_key.len = 0;
1604         }
1605 out:
1606         sess_data->result = rc;
1607         sess_data->func = NULL;
1608         SMB2_sess_free_buffer(sess_data);
1609 }
1610 #else
1611 static void
1612 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1613 {
1614         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1615         sess_data->result = -EOPNOTSUPP;
1616         sess_data->func = NULL;
1617 }
1618 #endif
1619
1620 static void
1621 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1622
1623 static void
1624 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1625 {
1626         int rc;
1627         struct cifs_ses *ses = sess_data->ses;
1628         struct TCP_Server_Info *server = sess_data->server;
1629         struct smb2_sess_setup_rsp *rsp = NULL;
1630         unsigned char *ntlmssp_blob = NULL;
1631         bool use_spnego = false; /* else use raw ntlmssp */
1632         u16 blob_length = 0;
1633         bool is_binding = false;
1634
1635         /*
1636          * If memory allocation is successful, caller of this function
1637          * frees it.
1638          */
1639         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1640         if (!ses->ntlmssp) {
1641                 rc = -ENOMEM;
1642                 goto out_err;
1643         }
1644         ses->ntlmssp->sesskey_per_smbsess = true;
1645
1646         rc = SMB2_sess_alloc_buffer(sess_data);
1647         if (rc)
1648                 goto out_err;
1649
1650         rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1651                                           &blob_length, ses, server,
1652                                           sess_data->nls_cp);
1653         if (rc)
1654                 goto out;
1655
1656         if (use_spnego) {
1657                 /* BB eventually need to add this */
1658                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1659                 rc = -EOPNOTSUPP;
1660                 goto out;
1661         }
1662         sess_data->iov[1].iov_base = ntlmssp_blob;
1663         sess_data->iov[1].iov_len = blob_length;
1664
1665         rc = SMB2_sess_sendreceive(sess_data);
1666         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1667
1668         /* If true, rc here is expected and not an error */
1669         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1670                 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1671                 rc = 0;
1672
1673         if (rc)
1674                 goto out;
1675
1676         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1677                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1678                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1679                         le16_to_cpu(rsp->SecurityBufferOffset));
1680                 rc = -EIO;
1681                 goto out;
1682         }
1683         rc = decode_ntlmssp_challenge(rsp->Buffer,
1684                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1685         if (rc)
1686                 goto out;
1687
1688         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1689
1690         spin_lock(&ses->ses_lock);
1691         is_binding = (ses->ses_status == SES_GOOD);
1692         spin_unlock(&ses->ses_lock);
1693
1694         /* keep existing ses id and flags if binding */
1695         if (!is_binding) {
1696                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1697                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1698         }
1699
1700 out:
1701         kfree_sensitive(ntlmssp_blob);
1702         SMB2_sess_free_buffer(sess_data);
1703         if (!rc) {
1704                 sess_data->result = 0;
1705                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1706                 return;
1707         }
1708 out_err:
1709         kfree_sensitive(ses->ntlmssp);
1710         ses->ntlmssp = NULL;
1711         sess_data->result = rc;
1712         sess_data->func = NULL;
1713 }
1714
1715 static void
1716 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1717 {
1718         int rc;
1719         struct cifs_ses *ses = sess_data->ses;
1720         struct TCP_Server_Info *server = sess_data->server;
1721         struct smb2_sess_setup_req *req;
1722         struct smb2_sess_setup_rsp *rsp = NULL;
1723         unsigned char *ntlmssp_blob = NULL;
1724         bool use_spnego = false; /* else use raw ntlmssp */
1725         u16 blob_length = 0;
1726         bool is_binding = false;
1727
1728         rc = SMB2_sess_alloc_buffer(sess_data);
1729         if (rc)
1730                 goto out;
1731
1732         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1733         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1734
1735         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1736                                      ses, server,
1737                                      sess_data->nls_cp);
1738         if (rc) {
1739                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1740                 goto out;
1741         }
1742
1743         if (use_spnego) {
1744                 /* BB eventually need to add this */
1745                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1746                 rc = -EOPNOTSUPP;
1747                 goto out;
1748         }
1749         sess_data->iov[1].iov_base = ntlmssp_blob;
1750         sess_data->iov[1].iov_len = blob_length;
1751
1752         rc = SMB2_sess_sendreceive(sess_data);
1753         if (rc)
1754                 goto out;
1755
1756         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1757
1758         spin_lock(&ses->ses_lock);
1759         is_binding = (ses->ses_status == SES_GOOD);
1760         spin_unlock(&ses->ses_lock);
1761
1762         /* keep existing ses id and flags if binding */
1763         if (!is_binding) {
1764                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1765                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1766         }
1767
1768         rc = SMB2_sess_establish_session(sess_data);
1769 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1770         if (ses->server->dialect < SMB30_PROT_ID) {
1771                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1772                 /*
1773                  * The session id is opaque in terms of endianness, so we can't
1774                  * print it as a long long. we dump it as we got it on the wire
1775                  */
1776                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1777                          &ses->Suid);
1778                 cifs_dbg(VFS, "Session Key   %*ph\n",
1779                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1780                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1781                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1782         }
1783 #endif
1784 out:
1785         kfree_sensitive(ntlmssp_blob);
1786         SMB2_sess_free_buffer(sess_data);
1787         kfree_sensitive(ses->ntlmssp);
1788         ses->ntlmssp = NULL;
1789         sess_data->result = rc;
1790         sess_data->func = NULL;
1791 }
1792
1793 static int
1794 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1795 {
1796         int type;
1797         struct cifs_ses *ses = sess_data->ses;
1798         struct TCP_Server_Info *server = sess_data->server;
1799
1800         type = smb2_select_sectype(server, ses->sectype);
1801         cifs_dbg(FYI, "sess setup type %d\n", type);
1802         if (type == Unspecified) {
1803                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1804                 return -EINVAL;
1805         }
1806
1807         switch (type) {
1808         case Kerberos:
1809                 sess_data->func = SMB2_auth_kerberos;
1810                 break;
1811         case RawNTLMSSP:
1812                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1813                 break;
1814         default:
1815                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1816                 return -EOPNOTSUPP;
1817         }
1818
1819         return 0;
1820 }
1821
1822 int
1823 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1824                 struct TCP_Server_Info *server,
1825                 const struct nls_table *nls_cp)
1826 {
1827         int rc = 0;
1828         struct SMB2_sess_data *sess_data;
1829
1830         cifs_dbg(FYI, "Session Setup\n");
1831
1832         if (!server) {
1833                 WARN(1, "%s: server is NULL!\n", __func__);
1834                 return -EIO;
1835         }
1836
1837         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1838         if (!sess_data)
1839                 return -ENOMEM;
1840
1841         sess_data->xid = xid;
1842         sess_data->ses = ses;
1843         sess_data->server = server;
1844         sess_data->buf0_type = CIFS_NO_BUFFER;
1845         sess_data->nls_cp = (struct nls_table *) nls_cp;
1846         sess_data->previous_session = ses->Suid;
1847
1848         rc = SMB2_select_sec(sess_data);
1849         if (rc)
1850                 goto out;
1851
1852         /*
1853          * Initialize the session hash with the server one.
1854          */
1855         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1856                SMB2_PREAUTH_HASH_SIZE);
1857
1858         while (sess_data->func)
1859                 sess_data->func(sess_data);
1860
1861         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1862                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1863         rc = sess_data->result;
1864 out:
1865         kfree_sensitive(sess_data);
1866         return rc;
1867 }
1868
1869 int
1870 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1871 {
1872         struct smb_rqst rqst;
1873         struct smb2_logoff_req *req; /* response is also trivial struct */
1874         int rc = 0;
1875         struct TCP_Server_Info *server;
1876         int flags = 0;
1877         unsigned int total_len;
1878         struct kvec iov[1];
1879         struct kvec rsp_iov;
1880         int resp_buf_type;
1881
1882         cifs_dbg(FYI, "disconnect session %p\n", ses);
1883
1884         if (ses && (ses->server))
1885                 server = ses->server;
1886         else
1887                 return -EIO;
1888
1889         /* no need to send SMB logoff if uid already closed due to reconnect */
1890         spin_lock(&ses->chan_lock);
1891         if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1892                 spin_unlock(&ses->chan_lock);
1893                 goto smb2_session_already_dead;
1894         }
1895         spin_unlock(&ses->chan_lock);
1896
1897         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1898                                  (void **) &req, &total_len);
1899         if (rc)
1900                 return rc;
1901
1902          /* since no tcon, smb2_init can not do this, so do here */
1903         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1904
1905         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1906                 flags |= CIFS_TRANSFORM_REQ;
1907         else if (server->sign)
1908                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1909
1910         flags |= CIFS_NO_RSP_BUF;
1911
1912         iov[0].iov_base = (char *)req;
1913         iov[0].iov_len = total_len;
1914
1915         memset(&rqst, 0, sizeof(struct smb_rqst));
1916         rqst.rq_iov = iov;
1917         rqst.rq_nvec = 1;
1918
1919         rc = cifs_send_recv(xid, ses, ses->server,
1920                             &rqst, &resp_buf_type, flags, &rsp_iov);
1921         cifs_small_buf_release(req);
1922         /*
1923          * No tcon so can't do
1924          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1925          */
1926
1927 smb2_session_already_dead:
1928         return rc;
1929 }
1930
1931 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1932 {
1933         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1934 }
1935
1936 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1937
1938 /* These are similar values to what Windows uses */
1939 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1940 {
1941         tcon->max_chunks = 256;
1942         tcon->max_bytes_chunk = 1048576;
1943         tcon->max_bytes_copy = 16777216;
1944 }
1945
1946 int
1947 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1948           struct cifs_tcon *tcon, const struct nls_table *cp)
1949 {
1950         struct smb_rqst rqst;
1951         struct smb2_tree_connect_req *req;
1952         struct smb2_tree_connect_rsp *rsp = NULL;
1953         struct kvec iov[2];
1954         struct kvec rsp_iov = { NULL, 0 };
1955         int rc = 0;
1956         int resp_buftype;
1957         int unc_path_len;
1958         __le16 *unc_path = NULL;
1959         int flags = 0;
1960         unsigned int total_len;
1961         struct TCP_Server_Info *server;
1962
1963         /* always use master channel */
1964         server = ses->server;
1965
1966         cifs_dbg(FYI, "TCON\n");
1967
1968         if (!server || !tree)
1969                 return -EIO;
1970
1971         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1972         if (unc_path == NULL)
1973                 return -ENOMEM;
1974
1975         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
1976         if (unc_path_len <= 0) {
1977                 kfree(unc_path);
1978                 return -EINVAL;
1979         }
1980         unc_path_len *= 2;
1981
1982         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1983         tcon->tid = 0;
1984         atomic_set(&tcon->num_remote_opens, 0);
1985         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1986                                  (void **) &req, &total_len);
1987         if (rc) {
1988                 kfree(unc_path);
1989                 return rc;
1990         }
1991
1992         if (smb3_encryption_required(tcon))
1993                 flags |= CIFS_TRANSFORM_REQ;
1994
1995         iov[0].iov_base = (char *)req;
1996         /* 1 for pad */
1997         iov[0].iov_len = total_len - 1;
1998
1999         /* Testing shows that buffer offset must be at location of Buffer[0] */
2000         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
2001         req->PathLength = cpu_to_le16(unc_path_len);
2002         iov[1].iov_base = unc_path;
2003         iov[1].iov_len = unc_path_len;
2004
2005         /*
2006          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
2007          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
2008          * (Samba servers don't always set the flag so also check if null user)
2009          */
2010         if ((server->dialect == SMB311_PROT_ID) &&
2011             !smb3_encryption_required(tcon) &&
2012             !(ses->session_flags &
2013                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
2014             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
2015                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
2016
2017         memset(&rqst, 0, sizeof(struct smb_rqst));
2018         rqst.rq_iov = iov;
2019         rqst.rq_nvec = 2;
2020
2021         /* Need 64 for max size write so ask for more in case not there yet */
2022         if (server->credits >= server->max_credits)
2023                 req->hdr.CreditRequest = cpu_to_le16(0);
2024         else
2025                 req->hdr.CreditRequest = cpu_to_le16(
2026                         min_t(int, server->max_credits -
2027                               server->credits, 64));
2028
2029         rc = cifs_send_recv(xid, ses, server,
2030                             &rqst, &resp_buftype, flags, &rsp_iov);
2031         cifs_small_buf_release(req);
2032         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
2033         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
2034         if ((rc != 0) || (rsp == NULL)) {
2035                 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
2036                 tcon->need_reconnect = true;
2037                 goto tcon_error_exit;
2038         }
2039
2040         switch (rsp->ShareType) {
2041         case SMB2_SHARE_TYPE_DISK:
2042                 cifs_dbg(FYI, "connection to disk share\n");
2043                 break;
2044         case SMB2_SHARE_TYPE_PIPE:
2045                 tcon->pipe = true;
2046                 cifs_dbg(FYI, "connection to pipe share\n");
2047                 break;
2048         case SMB2_SHARE_TYPE_PRINT:
2049                 tcon->print = true;
2050                 cifs_dbg(FYI, "connection to printer\n");
2051                 break;
2052         default:
2053                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
2054                 rc = -EOPNOTSUPP;
2055                 goto tcon_error_exit;
2056         }
2057
2058         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
2059         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
2060         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
2061         tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
2062         strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
2063
2064         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
2065             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
2066                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
2067
2068         if (tcon->seal &&
2069             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
2070                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
2071
2072         init_copy_chunk_defaults(tcon);
2073         if (server->ops->validate_negotiate)
2074                 rc = server->ops->validate_negotiate(xid, tcon);
2075         if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
2076                 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
2077                         server->nosharesock = true;
2078 tcon_exit:
2079
2080         free_rsp_buf(resp_buftype, rsp);
2081         kfree(unc_path);
2082         return rc;
2083
2084 tcon_error_exit:
2085         if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
2086                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
2087         goto tcon_exit;
2088 }
2089
2090 int
2091 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
2092 {
2093         struct smb_rqst rqst;
2094         struct smb2_tree_disconnect_req *req; /* response is trivial */
2095         int rc = 0;
2096         struct cifs_ses *ses = tcon->ses;
2097         int flags = 0;
2098         unsigned int total_len;
2099         struct kvec iov[1];
2100         struct kvec rsp_iov;
2101         int resp_buf_type;
2102
2103         cifs_dbg(FYI, "Tree Disconnect\n");
2104
2105         if (!ses || !(ses->server))
2106                 return -EIO;
2107
2108         trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
2109         spin_lock(&ses->chan_lock);
2110         if ((tcon->need_reconnect) ||
2111             (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
2112                 spin_unlock(&ses->chan_lock);
2113                 return 0;
2114         }
2115         spin_unlock(&ses->chan_lock);
2116
2117         invalidate_all_cached_dirs(tcon);
2118
2119         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
2120                                  (void **) &req,
2121                                  &total_len);
2122         if (rc)
2123                 return rc;
2124
2125         if (smb3_encryption_required(tcon))
2126                 flags |= CIFS_TRANSFORM_REQ;
2127
2128         flags |= CIFS_NO_RSP_BUF;
2129
2130         iov[0].iov_base = (char *)req;
2131         iov[0].iov_len = total_len;
2132
2133         memset(&rqst, 0, sizeof(struct smb_rqst));
2134         rqst.rq_iov = iov;
2135         rqst.rq_nvec = 1;
2136
2137         rc = cifs_send_recv(xid, ses, ses->server,
2138                             &rqst, &resp_buf_type, flags, &rsp_iov);
2139         cifs_small_buf_release(req);
2140         if (rc) {
2141                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2142                 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2143         }
2144         trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2145
2146         return rc;
2147 }
2148
2149
2150 static struct create_durable *
2151 create_durable_buf(void)
2152 {
2153         struct create_durable *buf;
2154
2155         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2156         if (!buf)
2157                 return NULL;
2158
2159         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2160                                         (struct create_durable, Data));
2161         buf->ccontext.DataLength = cpu_to_le32(16);
2162         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2163                                 (struct create_durable, Name));
2164         buf->ccontext.NameLength = cpu_to_le16(4);
2165         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2166         buf->Name[0] = 'D';
2167         buf->Name[1] = 'H';
2168         buf->Name[2] = 'n';
2169         buf->Name[3] = 'Q';
2170         return buf;
2171 }
2172
2173 static struct create_durable *
2174 create_reconnect_durable_buf(struct cifs_fid *fid)
2175 {
2176         struct create_durable *buf;
2177
2178         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2179         if (!buf)
2180                 return NULL;
2181
2182         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2183                                         (struct create_durable, Data));
2184         buf->ccontext.DataLength = cpu_to_le32(16);
2185         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2186                                 (struct create_durable, Name));
2187         buf->ccontext.NameLength = cpu_to_le16(4);
2188         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2189         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2190         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2191         buf->Name[0] = 'D';
2192         buf->Name[1] = 'H';
2193         buf->Name[2] = 'n';
2194         buf->Name[3] = 'C';
2195         return buf;
2196 }
2197
2198 static void
2199 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2200 {
2201         struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
2202
2203         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2204                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2205         buf->IndexNumber = pdisk_id->DiskFileId;
2206 }
2207
2208 static void
2209 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2210                  struct create_posix_rsp *posix)
2211 {
2212         int sid_len;
2213         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2214         u8 *end = beg + le32_to_cpu(cc->DataLength);
2215         u8 *sid;
2216
2217         memset(posix, 0, sizeof(*posix));
2218
2219         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2220         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2221         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2222
2223         sid = beg + 12;
2224         sid_len = posix_info_sid_size(sid, end);
2225         if (sid_len < 0) {
2226                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2227                 return;
2228         }
2229         memcpy(&posix->owner, sid, sid_len);
2230
2231         sid = sid + sid_len;
2232         sid_len = posix_info_sid_size(sid, end);
2233         if (sid_len < 0) {
2234                 cifs_dbg(VFS, "bad group sid in posix create response\n");
2235                 return;
2236         }
2237         memcpy(&posix->group, sid, sid_len);
2238
2239         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2240                  posix->nlink, posix->mode, posix->reparse_tag);
2241 }
2242
2243 int smb2_parse_contexts(struct TCP_Server_Info *server,
2244                         struct kvec *rsp_iov,
2245                         unsigned int *epoch,
2246                         char *lease_key, __u8 *oplock,
2247                         struct smb2_file_all_info *buf,
2248                         struct create_posix_rsp *posix)
2249 {
2250         struct smb2_create_rsp *rsp = rsp_iov->iov_base;
2251         struct create_context *cc;
2252         size_t rem, off, len;
2253         size_t doff, dlen;
2254         size_t noff, nlen;
2255         char *name;
2256         static const char smb3_create_tag_posix[] = {
2257                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2258                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2259                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2260         };
2261
2262         *oplock = 0;
2263
2264         off = le32_to_cpu(rsp->CreateContextsOffset);
2265         rem = le32_to_cpu(rsp->CreateContextsLength);
2266         if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)
2267                 return -EINVAL;
2268         cc = (struct create_context *)((u8 *)rsp + off);
2269
2270         /* Initialize inode number to 0 in case no valid data in qfid context */
2271         if (buf)
2272                 buf->IndexNumber = 0;
2273
2274         while (rem >= sizeof(*cc)) {
2275                 doff = le16_to_cpu(cc->DataOffset);
2276                 dlen = le32_to_cpu(cc->DataLength);
2277                 if (check_add_overflow(doff, dlen, &len) || len > rem)
2278                         return -EINVAL;
2279
2280                 noff = le16_to_cpu(cc->NameOffset);
2281                 nlen = le16_to_cpu(cc->NameLength);
2282                 if (noff + nlen >= doff)
2283                         return -EINVAL;
2284
2285                 name = (char *)cc + noff;
2286                 switch (nlen) {
2287                 case 4:
2288                         if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
2289                                 *oplock = server->ops->parse_lease_buf(cc, epoch,
2290                                                                        lease_key);
2291                         } else if (buf &&
2292                                    !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {
2293                                 parse_query_id_ctxt(cc, buf);
2294                         }
2295                         break;
2296                 case 16:
2297                         if (posix && !memcmp(name, smb3_create_tag_posix, 16))
2298                                 parse_posix_ctxt(cc, buf, posix);
2299                         break;
2300                 default:
2301                         cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",
2302                                  __func__, nlen, dlen);
2303                         if (IS_ENABLED(CONFIG_CIFS_DEBUG2))
2304                                 cifs_dump_mem("context data: ", cc, dlen);
2305                         break;
2306                 }
2307
2308                 off = le32_to_cpu(cc->Next);
2309                 if (!off)
2310                         break;
2311                 if (check_sub_overflow(rem, off, &rem))
2312                         return -EINVAL;
2313                 cc = (struct create_context *)((u8 *)cc + off);
2314         }
2315
2316         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2317                 *oplock = rsp->OplockLevel;
2318
2319         return 0;
2320 }
2321
2322 static int
2323 add_lease_context(struct TCP_Server_Info *server,
2324                   struct smb2_create_req *req,
2325                   struct kvec *iov,
2326                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2327 {
2328         unsigned int num = *num_iovec;
2329
2330         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2331         if (iov[num].iov_base == NULL)
2332                 return -ENOMEM;
2333         iov[num].iov_len = server->vals->create_lease_size;
2334         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2335         *num_iovec = num + 1;
2336         return 0;
2337 }
2338
2339 static struct create_durable_v2 *
2340 create_durable_v2_buf(struct cifs_open_parms *oparms)
2341 {
2342         struct cifs_fid *pfid = oparms->fid;
2343         struct create_durable_v2 *buf;
2344
2345         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2346         if (!buf)
2347                 return NULL;
2348
2349         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2350                                         (struct create_durable_v2, dcontext));
2351         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2352         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2353                                 (struct create_durable_v2, Name));
2354         buf->ccontext.NameLength = cpu_to_le16(4);
2355
2356         /*
2357          * NB: Handle timeout defaults to 0, which allows server to choose
2358          * (most servers default to 120 seconds) and most clients default to 0.
2359          * This can be overridden at mount ("handletimeout=") if the user wants
2360          * a different persistent (or resilient) handle timeout for all opens
2361          * on a particular SMB3 mount.
2362          */
2363         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2364         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2365         generate_random_uuid(buf->dcontext.CreateGuid);
2366         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2367
2368         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2369         buf->Name[0] = 'D';
2370         buf->Name[1] = 'H';
2371         buf->Name[2] = '2';
2372         buf->Name[3] = 'Q';
2373         return buf;
2374 }
2375
2376 static struct create_durable_handle_reconnect_v2 *
2377 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2378 {
2379         struct create_durable_handle_reconnect_v2 *buf;
2380
2381         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2382                         GFP_KERNEL);
2383         if (!buf)
2384                 return NULL;
2385
2386         buf->ccontext.DataOffset =
2387                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2388                                      dcontext));
2389         buf->ccontext.DataLength =
2390                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2391         buf->ccontext.NameOffset =
2392                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2393                             Name));
2394         buf->ccontext.NameLength = cpu_to_le16(4);
2395
2396         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2397         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2398         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2399         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2400
2401         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2402         buf->Name[0] = 'D';
2403         buf->Name[1] = 'H';
2404         buf->Name[2] = '2';
2405         buf->Name[3] = 'C';
2406         return buf;
2407 }
2408
2409 static int
2410 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2411                     struct cifs_open_parms *oparms)
2412 {
2413         unsigned int num = *num_iovec;
2414
2415         iov[num].iov_base = create_durable_v2_buf(oparms);
2416         if (iov[num].iov_base == NULL)
2417                 return -ENOMEM;
2418         iov[num].iov_len = sizeof(struct create_durable_v2);
2419         *num_iovec = num + 1;
2420         return 0;
2421 }
2422
2423 static int
2424 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2425                     struct cifs_open_parms *oparms)
2426 {
2427         unsigned int num = *num_iovec;
2428
2429         /* indicate that we don't need to relock the file */
2430         oparms->reconnect = false;
2431
2432         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2433         if (iov[num].iov_base == NULL)
2434                 return -ENOMEM;
2435         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2436         *num_iovec = num + 1;
2437         return 0;
2438 }
2439
2440 static int
2441 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2442                     struct cifs_open_parms *oparms, bool use_persistent)
2443 {
2444         unsigned int num = *num_iovec;
2445
2446         if (use_persistent) {
2447                 if (oparms->reconnect)
2448                         return add_durable_reconnect_v2_context(iov, num_iovec,
2449                                                                 oparms);
2450                 else
2451                         return add_durable_v2_context(iov, num_iovec, oparms);
2452         }
2453
2454         if (oparms->reconnect) {
2455                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2456                 /* indicate that we don't need to relock the file */
2457                 oparms->reconnect = false;
2458         } else
2459                 iov[num].iov_base = create_durable_buf();
2460         if (iov[num].iov_base == NULL)
2461                 return -ENOMEM;
2462         iov[num].iov_len = sizeof(struct create_durable);
2463         *num_iovec = num + 1;
2464         return 0;
2465 }
2466
2467 /* See MS-SMB2 2.2.13.2.7 */
2468 static struct crt_twarp_ctxt *
2469 create_twarp_buf(__u64 timewarp)
2470 {
2471         struct crt_twarp_ctxt *buf;
2472
2473         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2474         if (!buf)
2475                 return NULL;
2476
2477         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2478                                         (struct crt_twarp_ctxt, Timestamp));
2479         buf->ccontext.DataLength = cpu_to_le32(8);
2480         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2481                                 (struct crt_twarp_ctxt, Name));
2482         buf->ccontext.NameLength = cpu_to_le16(4);
2483         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2484         buf->Name[0] = 'T';
2485         buf->Name[1] = 'W';
2486         buf->Name[2] = 'r';
2487         buf->Name[3] = 'p';
2488         buf->Timestamp = cpu_to_le64(timewarp);
2489         return buf;
2490 }
2491
2492 /* See MS-SMB2 2.2.13.2.7 */
2493 static int
2494 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2495 {
2496         unsigned int num = *num_iovec;
2497
2498         iov[num].iov_base = create_twarp_buf(timewarp);
2499         if (iov[num].iov_base == NULL)
2500                 return -ENOMEM;
2501         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2502         *num_iovec = num + 1;
2503         return 0;
2504 }
2505
2506 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2507 static void setup_owner_group_sids(char *buf)
2508 {
2509         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2510
2511         /* Populate the user ownership fields S-1-5-88-1 */
2512         sids->owner.Revision = 1;
2513         sids->owner.NumAuth = 3;
2514         sids->owner.Authority[5] = 5;
2515         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2516         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2517         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2518
2519         /* Populate the group ownership fields S-1-5-88-2 */
2520         sids->group.Revision = 1;
2521         sids->group.NumAuth = 3;
2522         sids->group.Authority[5] = 5;
2523         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2524         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2525         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2526
2527         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2528 }
2529
2530 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2531 static struct crt_sd_ctxt *
2532 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2533 {
2534         struct crt_sd_ctxt *buf;
2535         __u8 *ptr, *aclptr;
2536         unsigned int acelen, acl_size, ace_count;
2537         unsigned int owner_offset = 0;
2538         unsigned int group_offset = 0;
2539         struct smb3_acl acl = {};
2540
2541         *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2542
2543         if (set_owner) {
2544                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2545                 *len += sizeof(struct owner_group_sids);
2546         }
2547
2548         buf = kzalloc(*len, GFP_KERNEL);
2549         if (buf == NULL)
2550                 return buf;
2551
2552         ptr = (__u8 *)&buf[1];
2553         if (set_owner) {
2554                 /* offset fields are from beginning of security descriptor not of create context */
2555                 owner_offset = ptr - (__u8 *)&buf->sd;
2556                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2557                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2558                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2559
2560                 setup_owner_group_sids(ptr);
2561                 ptr += sizeof(struct owner_group_sids);
2562         } else {
2563                 buf->sd.OffsetOwner = 0;
2564                 buf->sd.OffsetGroup = 0;
2565         }
2566
2567         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2568         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2569         buf->ccontext.NameLength = cpu_to_le16(4);
2570         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2571         buf->Name[0] = 'S';
2572         buf->Name[1] = 'e';
2573         buf->Name[2] = 'c';
2574         buf->Name[3] = 'D';
2575         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2576
2577         /*
2578          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2579          * and "DP" ie the DACL is present
2580          */
2581         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2582
2583         /* offset owner, group and Sbz1 and SACL are all zero */
2584         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2585         /* Ship the ACL for now. we will copy it into buf later. */
2586         aclptr = ptr;
2587         ptr += sizeof(struct smb3_acl);
2588
2589         /* create one ACE to hold the mode embedded in reserved special SID */
2590         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2591         ptr += acelen;
2592         acl_size = acelen + sizeof(struct smb3_acl);
2593         ace_count = 1;
2594
2595         if (set_owner) {
2596                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2597                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2598                 ptr += acelen;
2599                 acl_size += acelen;
2600                 ace_count += 1;
2601         }
2602
2603         /* and one more ACE to allow access for authenticated users */
2604         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2605         ptr += acelen;
2606         acl_size += acelen;
2607         ace_count += 1;
2608
2609         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2610         acl.AclSize = cpu_to_le16(acl_size);
2611         acl.AceCount = cpu_to_le16(ace_count);
2612         /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2613         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2614
2615         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2616         *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2617
2618         return buf;
2619 }
2620
2621 static int
2622 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2623 {
2624         unsigned int num = *num_iovec;
2625         unsigned int len = 0;
2626
2627         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2628         if (iov[num].iov_base == NULL)
2629                 return -ENOMEM;
2630         iov[num].iov_len = len;
2631         *num_iovec = num + 1;
2632         return 0;
2633 }
2634
2635 static struct crt_query_id_ctxt *
2636 create_query_id_buf(void)
2637 {
2638         struct crt_query_id_ctxt *buf;
2639
2640         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2641         if (!buf)
2642                 return NULL;
2643
2644         buf->ccontext.DataOffset = cpu_to_le16(0);
2645         buf->ccontext.DataLength = cpu_to_le32(0);
2646         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2647                                 (struct crt_query_id_ctxt, Name));
2648         buf->ccontext.NameLength = cpu_to_le16(4);
2649         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2650         buf->Name[0] = 'Q';
2651         buf->Name[1] = 'F';
2652         buf->Name[2] = 'i';
2653         buf->Name[3] = 'd';
2654         return buf;
2655 }
2656
2657 /* See MS-SMB2 2.2.13.2.9 */
2658 static int
2659 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2660 {
2661         unsigned int num = *num_iovec;
2662
2663         iov[num].iov_base = create_query_id_buf();
2664         if (iov[num].iov_base == NULL)
2665                 return -ENOMEM;
2666         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2667         *num_iovec = num + 1;
2668         return 0;
2669 }
2670
2671 static int
2672 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2673                             const char *treename, const __le16 *path)
2674 {
2675         int treename_len, path_len;
2676         struct nls_table *cp;
2677         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2678
2679         /*
2680          * skip leading "\\"
2681          */
2682         treename_len = strlen(treename);
2683         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2684                 return -EINVAL;
2685
2686         treename += 2;
2687         treename_len -= 2;
2688
2689         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2690
2691         /* make room for one path separator only if @path isn't empty */
2692         *out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2693
2694         /*
2695          * final path needs to be 8-byte aligned as specified in
2696          * MS-SMB2 2.2.13 SMB2 CREATE Request.
2697          */
2698         *out_size = round_up(*out_len * sizeof(__le16), 8);
2699         *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2700         if (!*out_path)
2701                 return -ENOMEM;
2702
2703         cp = load_nls_default();
2704         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2705
2706         /* Do not append the separator if the path is empty */
2707         if (path[0] != cpu_to_le16(0x0000)) {
2708                 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);
2709                 UniStrcat((wchar_t *)*out_path, (wchar_t *)path);
2710         }
2711
2712         unload_nls(cp);
2713
2714         return 0;
2715 }
2716
2717 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2718                                umode_t mode, struct cifs_tcon *tcon,
2719                                const char *full_path,
2720                                struct cifs_sb_info *cifs_sb)
2721 {
2722         struct smb_rqst rqst;
2723         struct smb2_create_req *req;
2724         struct smb2_create_rsp *rsp = NULL;
2725         struct cifs_ses *ses = tcon->ses;
2726         struct kvec iov[3]; /* make sure at least one for each open context */
2727         struct kvec rsp_iov = {NULL, 0};
2728         int resp_buftype;
2729         int uni_path_len;
2730         __le16 *copy_path = NULL;
2731         int copy_size;
2732         int rc = 0;
2733         unsigned int n_iov = 2;
2734         __u32 file_attributes = 0;
2735         char *pc_buf = NULL;
2736         int flags = 0;
2737         unsigned int total_len;
2738         __le16 *utf16_path = NULL;
2739         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2740
2741         cifs_dbg(FYI, "mkdir\n");
2742
2743         /* resource #1: path allocation */
2744         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2745         if (!utf16_path)
2746                 return -ENOMEM;
2747
2748         if (!ses || !server) {
2749                 rc = -EIO;
2750                 goto err_free_path;
2751         }
2752
2753         /* resource #2: request */
2754         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2755                                  (void **) &req, &total_len);
2756         if (rc)
2757                 goto err_free_path;
2758
2759
2760         if (smb3_encryption_required(tcon))
2761                 flags |= CIFS_TRANSFORM_REQ;
2762
2763         req->ImpersonationLevel = IL_IMPERSONATION;
2764         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2765         /* File attributes ignored on open (used in create though) */
2766         req->FileAttributes = cpu_to_le32(file_attributes);
2767         req->ShareAccess = FILE_SHARE_ALL_LE;
2768         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2769         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2770
2771         iov[0].iov_base = (char *)req;
2772         /* -1 since last byte is buf[0] which is sent below (path) */
2773         iov[0].iov_len = total_len - 1;
2774
2775         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2776
2777         /* [MS-SMB2] 2.2.13 NameOffset:
2778          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2779          * the SMB2 header, the file name includes a prefix that will
2780          * be processed during DFS name normalization as specified in
2781          * section 3.3.5.9. Otherwise, the file name is relative to
2782          * the share that is identified by the TreeId in the SMB2
2783          * header.
2784          */
2785         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2786                 int name_len;
2787
2788                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2789                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2790                                                  &name_len,
2791                                                  tcon->tree_name, utf16_path);
2792                 if (rc)
2793                         goto err_free_req;
2794
2795                 req->NameLength = cpu_to_le16(name_len * 2);
2796                 uni_path_len = copy_size;
2797                 /* free before overwriting resource */
2798                 kfree(utf16_path);
2799                 utf16_path = copy_path;
2800         } else {
2801                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2802                 /* MUST set path len (NameLength) to 0 opening root of share */
2803                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2804                 if (uni_path_len % 8 != 0) {
2805                         copy_size = roundup(uni_path_len, 8);
2806                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2807                         if (!copy_path) {
2808                                 rc = -ENOMEM;
2809                                 goto err_free_req;
2810                         }
2811                         memcpy((char *)copy_path, (const char *)utf16_path,
2812                                uni_path_len);
2813                         uni_path_len = copy_size;
2814                         /* free before overwriting resource */
2815                         kfree(utf16_path);
2816                         utf16_path = copy_path;
2817                 }
2818         }
2819
2820         iov[1].iov_len = uni_path_len;
2821         iov[1].iov_base = utf16_path;
2822         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2823
2824         if (tcon->posix_extensions) {
2825                 /* resource #3: posix buf */
2826                 rc = add_posix_context(iov, &n_iov, mode);
2827                 if (rc)
2828                         goto err_free_req;
2829                 req->CreateContextsOffset = cpu_to_le32(
2830                         sizeof(struct smb2_create_req) +
2831                         iov[1].iov_len);
2832                 pc_buf = iov[n_iov-1].iov_base;
2833         }
2834
2835
2836         memset(&rqst, 0, sizeof(struct smb_rqst));
2837         rqst.rq_iov = iov;
2838         rqst.rq_nvec = n_iov;
2839
2840         /* no need to inc num_remote_opens because we close it just below */
2841         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
2842                                     FILE_WRITE_ATTRIBUTES);
2843         /* resource #4: response buffer */
2844         rc = cifs_send_recv(xid, ses, server,
2845                             &rqst, &resp_buftype, flags, &rsp_iov);
2846         if (rc) {
2847                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2848                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2849                                            CREATE_NOT_FILE,
2850                                            FILE_WRITE_ATTRIBUTES, rc);
2851                 goto err_free_rsp_buf;
2852         }
2853
2854         /*
2855          * Although unlikely to be possible for rsp to be null and rc not set,
2856          * adding check below is slightly safer long term (and quiets Coverity
2857          * warning)
2858          */
2859         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2860         if (rsp == NULL) {
2861                 rc = -EIO;
2862                 kfree(pc_buf);
2863                 goto err_free_req;
2864         }
2865
2866         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2867                                     CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2868
2869         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2870
2871         /* Eventually save off posix specific response info and timestaps */
2872
2873 err_free_rsp_buf:
2874         free_rsp_buf(resp_buftype, rsp);
2875         kfree(pc_buf);
2876 err_free_req:
2877         cifs_small_buf_release(req);
2878 err_free_path:
2879         kfree(utf16_path);
2880         return rc;
2881 }
2882
2883 int
2884 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2885                struct smb_rqst *rqst, __u8 *oplock,
2886                struct cifs_open_parms *oparms, __le16 *path)
2887 {
2888         struct smb2_create_req *req;
2889         unsigned int n_iov = 2;
2890         __u32 file_attributes = 0;
2891         int copy_size;
2892         int uni_path_len;
2893         unsigned int total_len;
2894         struct kvec *iov = rqst->rq_iov;
2895         __le16 *copy_path;
2896         int rc;
2897
2898         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2899                                  (void **) &req, &total_len);
2900         if (rc)
2901                 return rc;
2902
2903         iov[0].iov_base = (char *)req;
2904         /* -1 since last byte is buf[0] which is sent below (path) */
2905         iov[0].iov_len = total_len - 1;
2906
2907         if (oparms->create_options & CREATE_OPTION_READONLY)
2908                 file_attributes |= ATTR_READONLY;
2909         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2910                 file_attributes |= ATTR_SYSTEM;
2911
2912         req->ImpersonationLevel = IL_IMPERSONATION;
2913         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2914         /* File attributes ignored on open (used in create though) */
2915         req->FileAttributes = cpu_to_le32(file_attributes);
2916         req->ShareAccess = FILE_SHARE_ALL_LE;
2917
2918         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2919         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2920         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2921
2922         /* [MS-SMB2] 2.2.13 NameOffset:
2923          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2924          * the SMB2 header, the file name includes a prefix that will
2925          * be processed during DFS name normalization as specified in
2926          * section 3.3.5.9. Otherwise, the file name is relative to
2927          * the share that is identified by the TreeId in the SMB2
2928          * header.
2929          */
2930         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2931                 int name_len;
2932
2933                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2934                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2935                                                  &name_len,
2936                                                  tcon->tree_name, path);
2937                 if (rc)
2938                         return rc;
2939                 req->NameLength = cpu_to_le16(name_len * 2);
2940                 uni_path_len = copy_size;
2941                 path = copy_path;
2942         } else {
2943                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2944                 /* MUST set path len (NameLength) to 0 opening root of share */
2945                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2946                 copy_size = round_up(uni_path_len, 8);
2947                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2948                 if (!copy_path)
2949                         return -ENOMEM;
2950                 memcpy((char *)copy_path, (const char *)path,
2951                        uni_path_len);
2952                 uni_path_len = copy_size;
2953                 path = copy_path;
2954         }
2955
2956         iov[1].iov_len = uni_path_len;
2957         iov[1].iov_base = path;
2958
2959         if ((!server->oplocks) || (tcon->no_lease))
2960                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2961
2962         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2963             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2964                 req->RequestedOplockLevel = *oplock;
2965         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2966                   (oparms->create_options & CREATE_NOT_FILE))
2967                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2968         else {
2969                 rc = add_lease_context(server, req, iov, &n_iov,
2970                                        oparms->fid->lease_key, oplock);
2971                 if (rc)
2972                         return rc;
2973         }
2974
2975         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2976                 rc = add_durable_context(iov, &n_iov, oparms,
2977                                         tcon->use_persistent);
2978                 if (rc)
2979                         return rc;
2980         }
2981
2982         if (tcon->posix_extensions) {
2983                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2984                 if (rc)
2985                         return rc;
2986         }
2987
2988         if (tcon->snapshot_time) {
2989                 cifs_dbg(FYI, "adding snapshot context\n");
2990                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2991                 if (rc)
2992                         return rc;
2993         }
2994
2995         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2996                 bool set_mode;
2997                 bool set_owner;
2998
2999                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
3000                     (oparms->mode != ACL_NO_MODE))
3001                         set_mode = true;
3002                 else {
3003                         set_mode = false;
3004                         oparms->mode = ACL_NO_MODE;
3005                 }
3006
3007                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
3008                         set_owner = true;
3009                 else
3010                         set_owner = false;
3011
3012                 if (set_owner | set_mode) {
3013                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
3014                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
3015                         if (rc)
3016                                 return rc;
3017                 }
3018         }
3019
3020         add_query_id_context(iov, &n_iov);
3021
3022         if (n_iov > 2) {
3023                 /*
3024                  * We have create contexts behind iov[1] (the file
3025                  * name), point at them from the main create request
3026                  */
3027                 req->CreateContextsOffset = cpu_to_le32(
3028                         sizeof(struct smb2_create_req) +
3029                         iov[1].iov_len);
3030                 req->CreateContextsLength = 0;
3031
3032                 for (unsigned int i = 2; i < (n_iov-1); i++) {
3033                         struct kvec *v = &iov[i];
3034                         size_t len = v->iov_len;
3035                         struct create_context *cctx =
3036                                 (struct create_context *)v->iov_base;
3037
3038                         cctx->Next = cpu_to_le32(len);
3039                         le32_add_cpu(&req->CreateContextsLength, len);
3040                 }
3041                 le32_add_cpu(&req->CreateContextsLength,
3042                              iov[n_iov-1].iov_len);
3043         }
3044
3045         rqst->rq_nvec = n_iov;
3046         return 0;
3047 }
3048
3049 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
3050  * All other vectors are freed by kfree().
3051  */
3052 void
3053 SMB2_open_free(struct smb_rqst *rqst)
3054 {
3055         int i;
3056
3057         if (rqst && rqst->rq_iov) {
3058                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
3059                 for (i = 1; i < rqst->rq_nvec; i++)
3060                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3061                                 kfree(rqst->rq_iov[i].iov_base);
3062         }
3063 }
3064
3065 int
3066 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
3067           __u8 *oplock, struct smb2_file_all_info *buf,
3068           struct create_posix_rsp *posix,
3069           struct kvec *err_iov, int *buftype)
3070 {
3071         struct smb_rqst rqst;
3072         struct smb2_create_rsp *rsp = NULL;
3073         struct cifs_tcon *tcon = oparms->tcon;
3074         struct cifs_ses *ses = tcon->ses;
3075         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3076         struct kvec iov[SMB2_CREATE_IOV_SIZE];
3077         struct kvec rsp_iov = {NULL, 0};
3078         int resp_buftype = CIFS_NO_BUFFER;
3079         int rc = 0;
3080         int flags = 0;
3081
3082         cifs_dbg(FYI, "create/open\n");
3083         if (!ses || !server)
3084                 return -EIO;
3085
3086         if (smb3_encryption_required(tcon))
3087                 flags |= CIFS_TRANSFORM_REQ;
3088
3089         memset(&rqst, 0, sizeof(struct smb_rqst));
3090         memset(&iov, 0, sizeof(iov));
3091         rqst.rq_iov = iov;
3092         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
3093
3094         rc = SMB2_open_init(tcon, server,
3095                             &rqst, oplock, oparms, path);
3096         if (rc)
3097                 goto creat_exit;
3098
3099         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
3100                 oparms->create_options, oparms->desired_access);
3101
3102         rc = cifs_send_recv(xid, ses, server,
3103                             &rqst, &resp_buftype, flags,
3104                             &rsp_iov);
3105         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3106
3107         if (rc != 0) {
3108                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3109                 if (err_iov && rsp) {
3110                         *err_iov = rsp_iov;
3111                         *buftype = resp_buftype;
3112                         resp_buftype = CIFS_NO_BUFFER;
3113                         rsp = NULL;
3114                 }
3115                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3116                                     oparms->create_options, oparms->desired_access, rc);
3117                 if (rc == -EREMCHG) {
3118                         pr_warn_once("server share %s deleted\n",
3119                                      tcon->tree_name);
3120                         tcon->need_reconnect = true;
3121                 }
3122                 goto creat_exit;
3123         } else if (rsp == NULL) /* unlikely to happen, but safer to check */
3124                 goto creat_exit;
3125         else
3126                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3127                                      oparms->create_options, oparms->desired_access);
3128
3129         atomic_inc(&tcon->num_remote_opens);
3130         oparms->fid->persistent_fid = rsp->PersistentFileId;
3131         oparms->fid->volatile_fid = rsp->VolatileFileId;
3132         oparms->fid->access = oparms->desired_access;
3133 #ifdef CONFIG_CIFS_DEBUG2
3134         oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3135 #endif /* CIFS_DEBUG2 */
3136
3137         if (buf) {
3138                 buf->CreationTime = rsp->CreationTime;
3139                 buf->LastAccessTime = rsp->LastAccessTime;
3140                 buf->LastWriteTime = rsp->LastWriteTime;
3141                 buf->ChangeTime = rsp->ChangeTime;
3142                 buf->AllocationSize = rsp->AllocationSize;
3143                 buf->EndOfFile = rsp->EndofFile;
3144                 buf->Attributes = rsp->FileAttributes;
3145                 buf->NumberOfLinks = cpu_to_le32(1);
3146                 buf->DeletePending = 0;
3147         }
3148
3149
3150         rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
3151                                  oparms->fid->lease_key, oplock, buf, posix);
3152 creat_exit:
3153         SMB2_open_free(&rqst);
3154         free_rsp_buf(resp_buftype, rsp);
3155         return rc;
3156 }
3157
3158 int
3159 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3160                 struct smb_rqst *rqst,
3161                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
3162                 char *in_data, u32 indatalen,
3163                 __u32 max_response_size)
3164 {
3165         struct smb2_ioctl_req *req;
3166         struct kvec *iov = rqst->rq_iov;
3167         unsigned int total_len;
3168         int rc;
3169         char *in_data_buf;
3170
3171         rc = smb2_ioctl_req_init(opcode, tcon, server,
3172                                  (void **) &req, &total_len);
3173         if (rc)
3174                 return rc;
3175
3176         if (indatalen) {
3177                 /*
3178                  * indatalen is usually small at a couple of bytes max, so
3179                  * just allocate through generic pool
3180                  */
3181                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3182                 if (!in_data_buf) {
3183                         cifs_small_buf_release(req);
3184                         return -ENOMEM;
3185                 }
3186         }
3187
3188         req->CtlCode = cpu_to_le32(opcode);
3189         req->PersistentFileId = persistent_fid;
3190         req->VolatileFileId = volatile_fid;
3191
3192         iov[0].iov_base = (char *)req;
3193         /*
3194          * If no input data, the size of ioctl struct in
3195          * protocol spec still includes a 1 byte data buffer,
3196          * but if input data passed to ioctl, we do not
3197          * want to double count this, so we do not send
3198          * the dummy one byte of data in iovec[0] if sending
3199          * input data (in iovec[1]).
3200          */
3201         if (indatalen) {
3202                 req->InputCount = cpu_to_le32(indatalen);
3203                 /* do not set InputOffset if no input data */
3204                 req->InputOffset =
3205                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3206                 rqst->rq_nvec = 2;
3207                 iov[0].iov_len = total_len - 1;
3208                 iov[1].iov_base = in_data_buf;
3209                 iov[1].iov_len = indatalen;
3210         } else {
3211                 rqst->rq_nvec = 1;
3212                 iov[0].iov_len = total_len;
3213         }
3214
3215         req->OutputOffset = 0;
3216         req->OutputCount = 0; /* MBZ */
3217
3218         /*
3219          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3220          * We Could increase default MaxOutputResponse, but that could require
3221          * more credits. Windows typically sets this smaller, but for some
3222          * ioctls it may be useful to allow server to send more. No point
3223          * limiting what the server can send as long as fits in one credit
3224          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3225          * to increase this limit up in the future.
3226          * Note that for snapshot queries that servers like Azure expect that
3227          * the first query be minimal size (and just used to get the number/size
3228          * of previous versions) so response size must be specified as EXACTLY
3229          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3230          * of eight bytes.  Currently that is the only case where we set max
3231          * response size smaller.
3232          */
3233         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3234         req->hdr.CreditCharge =
3235                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3236                                          SMB2_MAX_BUFFER_SIZE));
3237         /* always an FSCTL (for now) */
3238         req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3239
3240         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3241         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3242                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3243
3244         return 0;
3245 }
3246
3247 void
3248 SMB2_ioctl_free(struct smb_rqst *rqst)
3249 {
3250         int i;
3251
3252         if (rqst && rqst->rq_iov) {
3253                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3254                 for (i = 1; i < rqst->rq_nvec; i++)
3255                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3256                                 kfree(rqst->rq_iov[i].iov_base);
3257         }
3258 }
3259
3260
3261 /*
3262  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3263  */
3264 int
3265 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3266            u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3267            u32 max_out_data_len, char **out_data,
3268            u32 *plen /* returned data len */)
3269 {
3270         struct smb_rqst rqst;
3271         struct smb2_ioctl_rsp *rsp = NULL;
3272         struct cifs_ses *ses;
3273         struct TCP_Server_Info *server;
3274         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3275         struct kvec rsp_iov = {NULL, 0};
3276         int resp_buftype = CIFS_NO_BUFFER;
3277         int rc = 0;
3278         int flags = 0;
3279
3280         cifs_dbg(FYI, "SMB2 IOCTL\n");
3281
3282         if (out_data != NULL)
3283                 *out_data = NULL;
3284
3285         /* zero out returned data len, in case of error */
3286         if (plen)
3287                 *plen = 0;
3288
3289         if (!tcon)
3290                 return -EIO;
3291
3292         ses = tcon->ses;
3293         if (!ses)
3294                 return -EIO;
3295
3296         server = cifs_pick_channel(ses);
3297         if (!server)
3298                 return -EIO;
3299
3300         if (smb3_encryption_required(tcon))
3301                 flags |= CIFS_TRANSFORM_REQ;
3302
3303         memset(&rqst, 0, sizeof(struct smb_rqst));
3304         memset(&iov, 0, sizeof(iov));
3305         rqst.rq_iov = iov;
3306         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3307
3308         rc = SMB2_ioctl_init(tcon, server,
3309                              &rqst, persistent_fid, volatile_fid, opcode,
3310                              in_data, indatalen, max_out_data_len);
3311         if (rc)
3312                 goto ioctl_exit;
3313
3314         rc = cifs_send_recv(xid, ses, server,
3315                             &rqst, &resp_buftype, flags,
3316                             &rsp_iov);
3317         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3318
3319         if (rc != 0)
3320                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3321                                 ses->Suid, 0, opcode, rc);
3322
3323         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3324                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3325                 goto ioctl_exit;
3326         } else if (rc == -EINVAL) {
3327                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3328                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3329                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3330                         goto ioctl_exit;
3331                 }
3332         } else if (rc == -E2BIG) {
3333                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3334                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3335                         goto ioctl_exit;
3336                 }
3337         }
3338
3339         /* check if caller wants to look at return data or just return rc */
3340         if ((plen == NULL) || (out_data == NULL))
3341                 goto ioctl_exit;
3342
3343         /*
3344          * Although unlikely to be possible for rsp to be null and rc not set,
3345          * adding check below is slightly safer long term (and quiets Coverity
3346          * warning)
3347          */
3348         if (rsp == NULL) {
3349                 rc = -EIO;
3350                 goto ioctl_exit;
3351         }
3352
3353         *plen = le32_to_cpu(rsp->OutputCount);
3354
3355         /* We check for obvious errors in the output buffer length and offset */
3356         if (*plen == 0)
3357                 goto ioctl_exit; /* server returned no data */
3358         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3359                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3360                 *plen = 0;
3361                 rc = -EIO;
3362                 goto ioctl_exit;
3363         }
3364
3365         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3366                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3367                         le32_to_cpu(rsp->OutputOffset));
3368                 *plen = 0;
3369                 rc = -EIO;
3370                 goto ioctl_exit;
3371         }
3372
3373         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3374                             *plen, GFP_KERNEL);
3375         if (*out_data == NULL) {
3376                 rc = -ENOMEM;
3377                 goto ioctl_exit;
3378         }
3379
3380 ioctl_exit:
3381         SMB2_ioctl_free(&rqst);
3382         free_rsp_buf(resp_buftype, rsp);
3383         return rc;
3384 }
3385
3386 /*
3387  *   Individual callers to ioctl worker function follow
3388  */
3389
3390 int
3391 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3392                      u64 persistent_fid, u64 volatile_fid)
3393 {
3394         int rc;
3395         struct  compress_ioctl fsctl_input;
3396         char *ret_data = NULL;
3397
3398         fsctl_input.CompressionState =
3399                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3400
3401         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3402                         FSCTL_SET_COMPRESSION,
3403                         (char *)&fsctl_input /* data input */,
3404                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3405                         &ret_data /* out data */, NULL);
3406
3407         cifs_dbg(FYI, "set compression rc %d\n", rc);
3408
3409         return rc;
3410 }
3411
3412 int
3413 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3414                 struct smb_rqst *rqst,
3415                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3416 {
3417         struct smb2_close_req *req;
3418         struct kvec *iov = rqst->rq_iov;
3419         unsigned int total_len;
3420         int rc;
3421
3422         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3423                                  (void **) &req, &total_len);
3424         if (rc)
3425                 return rc;
3426
3427         req->PersistentFileId = persistent_fid;
3428         req->VolatileFileId = volatile_fid;
3429         if (query_attrs)
3430                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3431         else
3432                 req->Flags = 0;
3433         iov[0].iov_base = (char *)req;
3434         iov[0].iov_len = total_len;
3435
3436         return 0;
3437 }
3438
3439 void
3440 SMB2_close_free(struct smb_rqst *rqst)
3441 {
3442         if (rqst && rqst->rq_iov)
3443                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3444 }
3445
3446 int
3447 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3448              u64 persistent_fid, u64 volatile_fid,
3449              struct smb2_file_network_open_info *pbuf)
3450 {
3451         struct smb_rqst rqst;
3452         struct smb2_close_rsp *rsp = NULL;
3453         struct cifs_ses *ses = tcon->ses;
3454         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3455         struct kvec iov[1];
3456         struct kvec rsp_iov;
3457         int resp_buftype = CIFS_NO_BUFFER;
3458         int rc = 0;
3459         int flags = 0;
3460         bool query_attrs = false;
3461
3462         cifs_dbg(FYI, "Close\n");
3463
3464         if (!ses || !server)
3465                 return -EIO;
3466
3467         if (smb3_encryption_required(tcon))
3468                 flags |= CIFS_TRANSFORM_REQ;
3469
3470         memset(&rqst, 0, sizeof(struct smb_rqst));
3471         memset(&iov, 0, sizeof(iov));
3472         rqst.rq_iov = iov;
3473         rqst.rq_nvec = 1;
3474
3475         /* check if need to ask server to return timestamps in close response */
3476         if (pbuf)
3477                 query_attrs = true;
3478
3479         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3480         rc = SMB2_close_init(tcon, server,
3481                              &rqst, persistent_fid, volatile_fid,
3482                              query_attrs);
3483         if (rc)
3484                 goto close_exit;
3485
3486         rc = cifs_send_recv(xid, ses, server,
3487                             &rqst, &resp_buftype, flags, &rsp_iov);
3488         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3489
3490         if (rc != 0) {
3491                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3492                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3493                                      rc);
3494                 goto close_exit;
3495         } else {
3496                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3497                                       ses->Suid);
3498                 if (pbuf)
3499                         memcpy(&pbuf->network_open_info,
3500                                &rsp->network_open_info,
3501                                sizeof(pbuf->network_open_info));
3502         }
3503
3504         atomic_dec(&tcon->num_remote_opens);
3505 close_exit:
3506         SMB2_close_free(&rqst);
3507         free_rsp_buf(resp_buftype, rsp);
3508
3509         /* retry close in a worker thread if this one is interrupted */
3510         if (is_interrupt_error(rc)) {
3511                 int tmp_rc;
3512
3513                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3514                                                      volatile_fid);
3515                 if (tmp_rc)
3516                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3517                                  persistent_fid, tmp_rc);
3518         }
3519         return rc;
3520 }
3521
3522 int
3523 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3524                 u64 persistent_fid, u64 volatile_fid)
3525 {
3526         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3527 }
3528
3529 int
3530 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3531                   struct kvec *iov, unsigned int min_buf_size)
3532 {
3533         unsigned int smb_len = iov->iov_len;
3534         char *end_of_smb = smb_len + (char *)iov->iov_base;
3535         char *begin_of_buf = offset + (char *)iov->iov_base;
3536         char *end_of_buf = begin_of_buf + buffer_length;
3537
3538
3539         if (buffer_length < min_buf_size) {
3540                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3541                          buffer_length, min_buf_size);
3542                 return -EINVAL;
3543         }
3544
3545         /* check if beyond RFC1001 maximum length */
3546         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3547                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3548                          buffer_length, smb_len);
3549                 return -EINVAL;
3550         }
3551
3552         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3553                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3554                 return -EINVAL;
3555         }
3556
3557         return 0;
3558 }
3559
3560 /*
3561  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3562  * Caller must free buffer.
3563  */
3564 int
3565 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3566                            struct kvec *iov, unsigned int minbufsize,
3567                            char *data)
3568 {
3569         char *begin_of_buf = offset + (char *)iov->iov_base;
3570         int rc;
3571
3572         if (!data)
3573                 return -EINVAL;
3574
3575         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3576         if (rc)
3577                 return rc;
3578
3579         memcpy(data, begin_of_buf, minbufsize);
3580
3581         return 0;
3582 }
3583
3584 int
3585 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3586                      struct smb_rqst *rqst,
3587                      u64 persistent_fid, u64 volatile_fid,
3588                      u8 info_class, u8 info_type, u32 additional_info,
3589                      size_t output_len, size_t input_len, void *input)
3590 {
3591         struct smb2_query_info_req *req;
3592         struct kvec *iov = rqst->rq_iov;
3593         unsigned int total_len;
3594         size_t len;
3595         int rc;
3596
3597         if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
3598                      len > CIFSMaxBufSize))
3599                 return -EINVAL;
3600
3601         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3602                                  (void **) &req, &total_len);
3603         if (rc)
3604                 return rc;
3605
3606         req->InfoType = info_type;
3607         req->FileInfoClass = info_class;
3608         req->PersistentFileId = persistent_fid;
3609         req->VolatileFileId = volatile_fid;
3610         req->AdditionalInformation = cpu_to_le32(additional_info);
3611
3612         req->OutputBufferLength = cpu_to_le32(output_len);
3613         if (input_len) {
3614                 req->InputBufferLength = cpu_to_le32(input_len);
3615                 /* total_len for smb query request never close to le16 max */
3616                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3617                 memcpy(req->Buffer, input, input_len);
3618         }
3619
3620         iov[0].iov_base = (char *)req;
3621         /* 1 for Buffer */
3622         iov[0].iov_len = len;
3623         return 0;
3624 }
3625
3626 void
3627 SMB2_query_info_free(struct smb_rqst *rqst)
3628 {
3629         if (rqst && rqst->rq_iov)
3630                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3631 }
3632
3633 static int
3634 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3635            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3636            u32 additional_info, size_t output_len, size_t min_len, void **data,
3637                 u32 *dlen)
3638 {
3639         struct smb_rqst rqst;
3640         struct smb2_query_info_rsp *rsp = NULL;
3641         struct kvec iov[1];
3642         struct kvec rsp_iov;
3643         int rc = 0;
3644         int resp_buftype = CIFS_NO_BUFFER;
3645         struct cifs_ses *ses = tcon->ses;
3646         struct TCP_Server_Info *server;
3647         int flags = 0;
3648         bool allocated = false;
3649
3650         cifs_dbg(FYI, "Query Info\n");
3651
3652         if (!ses)
3653                 return -EIO;
3654         server = cifs_pick_channel(ses);
3655         if (!server)
3656                 return -EIO;
3657
3658         if (smb3_encryption_required(tcon))
3659                 flags |= CIFS_TRANSFORM_REQ;
3660
3661         memset(&rqst, 0, sizeof(struct smb_rqst));
3662         memset(&iov, 0, sizeof(iov));
3663         rqst.rq_iov = iov;
3664         rqst.rq_nvec = 1;
3665
3666         rc = SMB2_query_info_init(tcon, server,
3667                                   &rqst, persistent_fid, volatile_fid,
3668                                   info_class, info_type, additional_info,
3669                                   output_len, 0, NULL);
3670         if (rc)
3671                 goto qinf_exit;
3672
3673         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3674                                     ses->Suid, info_class, (__u32)info_type);
3675
3676         rc = cifs_send_recv(xid, ses, server,
3677                             &rqst, &resp_buftype, flags, &rsp_iov);
3678         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3679
3680         if (rc) {
3681                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3682                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3683                                 ses->Suid, info_class, (__u32)info_type, rc);
3684                 goto qinf_exit;
3685         }
3686
3687         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3688                                 ses->Suid, info_class, (__u32)info_type);
3689
3690         if (dlen) {
3691                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3692                 if (!*data) {
3693                         *data = kmalloc(*dlen, GFP_KERNEL);
3694                         if (!*data) {
3695                                 cifs_tcon_dbg(VFS,
3696                                         "Error %d allocating memory for acl\n",
3697                                         rc);
3698                                 *dlen = 0;
3699                                 rc = -ENOMEM;
3700                                 goto qinf_exit;
3701                         }
3702                         allocated = true;
3703                 }
3704         }
3705
3706         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3707                                         le32_to_cpu(rsp->OutputBufferLength),
3708                                         &rsp_iov, dlen ? *dlen : min_len, *data);
3709         if (rc && allocated) {
3710                 kfree(*data);
3711                 *data = NULL;
3712                 *dlen = 0;
3713         }
3714
3715 qinf_exit:
3716         SMB2_query_info_free(&rqst);
3717         free_rsp_buf(resp_buftype, rsp);
3718         return rc;
3719 }
3720
3721 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3722         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3723 {
3724         return query_info(xid, tcon, persistent_fid, volatile_fid,
3725                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3726                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3727                           sizeof(struct smb2_file_all_info), (void **)&data,
3728                           NULL);
3729 }
3730
3731 #if 0
3732 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3733 int
3734 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3735                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3736 {
3737         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3738                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3739         *plen = 0;
3740
3741         return query_info(xid, tcon, persistent_fid, volatile_fid,
3742                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3743                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3744         /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3745 }
3746 #endif
3747
3748 int
3749 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3750                u64 persistent_fid, u64 volatile_fid,
3751                void **data, u32 *plen, u32 extra_info)
3752 {
3753         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3754                                 extra_info;
3755         *plen = 0;
3756
3757         return query_info(xid, tcon, persistent_fid, volatile_fid,
3758                           0, SMB2_O_INFO_SECURITY, additional_info,
3759                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3760 }
3761
3762 int
3763 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3764                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3765 {
3766         return query_info(xid, tcon, persistent_fid, volatile_fid,
3767                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3768                           sizeof(struct smb2_file_internal_info),
3769                           sizeof(struct smb2_file_internal_info),
3770                           (void **)&uniqueid, NULL);
3771 }
3772
3773 /*
3774  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3775  * See MS-SMB2 2.2.35 and 2.2.36
3776  */
3777
3778 static int
3779 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3780                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3781                  u64 persistent_fid, u64 volatile_fid,
3782                  u32 completion_filter, bool watch_tree)
3783 {
3784         struct smb2_change_notify_req *req;
3785         struct kvec *iov = rqst->rq_iov;
3786         unsigned int total_len;
3787         int rc;
3788
3789         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3790                                  (void **) &req, &total_len);
3791         if (rc)
3792                 return rc;
3793
3794         req->PersistentFileId = persistent_fid;
3795         req->VolatileFileId = volatile_fid;
3796         /* See note 354 of MS-SMB2, 64K max */
3797         req->OutputBufferLength =
3798                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3799         req->CompletionFilter = cpu_to_le32(completion_filter);
3800         if (watch_tree)
3801                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3802         else
3803                 req->Flags = 0;
3804
3805         iov[0].iov_base = (char *)req;
3806         iov[0].iov_len = total_len;
3807
3808         return 0;
3809 }
3810
3811 int
3812 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3813                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3814                 u32 completion_filter, u32 max_out_data_len, char **out_data,
3815                 u32 *plen /* returned data len */)
3816 {
3817         struct cifs_ses *ses = tcon->ses;
3818         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3819         struct smb_rqst rqst;
3820         struct smb2_change_notify_rsp *smb_rsp;
3821         struct kvec iov[1];
3822         struct kvec rsp_iov = {NULL, 0};
3823         int resp_buftype = CIFS_NO_BUFFER;
3824         int flags = 0;
3825         int rc = 0;
3826
3827         cifs_dbg(FYI, "change notify\n");
3828         if (!ses || !server)
3829                 return -EIO;
3830
3831         if (smb3_encryption_required(tcon))
3832                 flags |= CIFS_TRANSFORM_REQ;
3833
3834         memset(&rqst, 0, sizeof(struct smb_rqst));
3835         memset(&iov, 0, sizeof(iov));
3836         if (plen)
3837                 *plen = 0;
3838
3839         rqst.rq_iov = iov;
3840         rqst.rq_nvec = 1;
3841
3842         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3843                               persistent_fid, volatile_fid,
3844                               completion_filter, watch_tree);
3845         if (rc)
3846                 goto cnotify_exit;
3847
3848         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3849                                 (u8)watch_tree, completion_filter);
3850         rc = cifs_send_recv(xid, ses, server,
3851                             &rqst, &resp_buftype, flags, &rsp_iov);
3852
3853         if (rc != 0) {
3854                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3855                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3856                                 (u8)watch_tree, completion_filter, rc);
3857         } else {
3858                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3859                         ses->Suid, (u8)watch_tree, completion_filter);
3860                 /* validate that notify information is plausible */
3861                 if ((rsp_iov.iov_base == NULL) ||
3862                     (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
3863                         goto cnotify_exit;
3864
3865                 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
3866
3867                 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
3868                                 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
3869                                 sizeof(struct file_notify_information));
3870
3871                 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
3872                                 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
3873                 if (*out_data == NULL) {
3874                         rc = -ENOMEM;
3875                         goto cnotify_exit;
3876                 } else if (plen)
3877                         *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
3878         }
3879
3880  cnotify_exit:
3881         if (rqst.rq_iov)
3882                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3883         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3884         return rc;
3885 }
3886
3887
3888
3889 /*
3890  * This is a no-op for now. We're not really interested in the reply, but
3891  * rather in the fact that the server sent one and that server->lstrp
3892  * gets updated.
3893  *
3894  * FIXME: maybe we should consider checking that the reply matches request?
3895  */
3896 static void
3897 smb2_echo_callback(struct mid_q_entry *mid)
3898 {
3899         struct TCP_Server_Info *server = mid->callback_data;
3900         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3901         struct cifs_credits credits = { .value = 0, .instance = 0 };
3902
3903         if (mid->mid_state == MID_RESPONSE_RECEIVED
3904             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3905                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
3906                 credits.instance = server->reconnect_instance;
3907         }
3908
3909         release_mid(mid);
3910         add_credits(server, &credits, CIFS_ECHO_OP);
3911 }
3912
3913 void smb2_reconnect_server(struct work_struct *work)
3914 {
3915         struct TCP_Server_Info *server = container_of(work,
3916                                         struct TCP_Server_Info, reconnect.work);
3917         struct TCP_Server_Info *pserver;
3918         struct cifs_ses *ses, *ses2;
3919         struct cifs_tcon *tcon, *tcon2;
3920         struct list_head tmp_list, tmp_ses_list;
3921         bool tcon_exist = false, ses_exist = false;
3922         bool tcon_selected = false;
3923         int rc;
3924         bool resched = false;
3925
3926         /* first check if ref count has reached 0, if not inc ref count */
3927         spin_lock(&cifs_tcp_ses_lock);
3928         if (!server->srv_count) {
3929                 spin_unlock(&cifs_tcp_ses_lock);
3930                 return;
3931         }
3932         server->srv_count++;
3933         spin_unlock(&cifs_tcp_ses_lock);
3934
3935         /* If server is a channel, select the primary channel */
3936         pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
3937
3938         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3939         mutex_lock(&pserver->reconnect_mutex);
3940
3941         /* if the server is marked for termination, drop the ref count here */
3942         if (server->terminate) {
3943                 cifs_put_tcp_session(server, true);
3944                 mutex_unlock(&pserver->reconnect_mutex);
3945                 return;
3946         }
3947
3948         INIT_LIST_HEAD(&tmp_list);
3949         INIT_LIST_HEAD(&tmp_ses_list);
3950         cifs_dbg(FYI, "Reconnecting tcons and channels\n");
3951
3952         spin_lock(&cifs_tcp_ses_lock);
3953         list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
3954                 spin_lock(&ses->ses_lock);
3955                 if (ses->ses_status == SES_EXITING) {
3956                         spin_unlock(&ses->ses_lock);
3957                         continue;
3958                 }
3959                 spin_unlock(&ses->ses_lock);
3960
3961                 tcon_selected = false;
3962
3963                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3964                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3965                                 tcon->tc_count++;
3966                                 list_add_tail(&tcon->rlist, &tmp_list);
3967                                 tcon_selected = tcon_exist = true;
3968                         }
3969                 }
3970                 /*
3971                  * IPC has the same lifetime as its session and uses its
3972                  * refcount.
3973                  */
3974                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3975                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3976                         tcon_selected = tcon_exist = true;
3977                         cifs_smb_ses_inc_refcount(ses);
3978                 }
3979                 /*
3980                  * handle the case where channel needs to reconnect
3981                  * binding session, but tcon is healthy (some other channel
3982                  * is active)
3983                  */
3984                 spin_lock(&ses->chan_lock);
3985                 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
3986                         list_add_tail(&ses->rlist, &tmp_ses_list);
3987                         ses_exist = true;
3988                         cifs_smb_ses_inc_refcount(ses);
3989                 }
3990                 spin_unlock(&ses->chan_lock);
3991         }
3992         spin_unlock(&cifs_tcp_ses_lock);
3993
3994         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3995                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
3996                 if (!rc)
3997                         cifs_reopen_persistent_handles(tcon);
3998                 else
3999                         resched = true;
4000                 list_del_init(&tcon->rlist);
4001                 if (tcon->ipc)
4002                         cifs_put_smb_ses(tcon->ses);
4003                 else
4004                         cifs_put_tcon(tcon);
4005         }
4006
4007         if (!ses_exist)
4008                 goto done;
4009
4010         /* allocate a dummy tcon struct used for reconnect */
4011         tcon = tcon_info_alloc(false);
4012         if (!tcon) {
4013                 resched = true;
4014                 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4015                         list_del_init(&ses->rlist);
4016                         cifs_put_smb_ses(ses);
4017                 }
4018                 goto done;
4019         }
4020
4021         tcon->status = TID_GOOD;
4022         tcon->retry = false;
4023         tcon->need_reconnect = false;
4024
4025         /* now reconnect sessions for necessary channels */
4026         list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4027                 tcon->ses = ses;
4028                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4029                 if (rc)
4030                         resched = true;
4031                 list_del_init(&ses->rlist);
4032                 cifs_put_smb_ses(ses);
4033         }
4034         tconInfoFree(tcon);
4035
4036 done:
4037         cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
4038         if (resched)
4039                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
4040         mutex_unlock(&pserver->reconnect_mutex);
4041
4042         /* now we can safely release srv struct */
4043         cifs_put_tcp_session(server, true);
4044 }
4045
4046 int
4047 SMB2_echo(struct TCP_Server_Info *server)
4048 {
4049         struct smb2_echo_req *req;
4050         int rc = 0;
4051         struct kvec iov[1];
4052         struct smb_rqst rqst = { .rq_iov = iov,
4053                                  .rq_nvec = 1 };
4054         unsigned int total_len;
4055
4056         cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
4057
4058         spin_lock(&server->srv_lock);
4059         if (server->ops->need_neg &&
4060             server->ops->need_neg(server)) {
4061                 spin_unlock(&server->srv_lock);
4062                 /* No need to send echo on newly established connections */
4063                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
4064                 return rc;
4065         }
4066         spin_unlock(&server->srv_lock);
4067
4068         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
4069                                  (void **)&req, &total_len);
4070         if (rc)
4071                 return rc;
4072
4073         req->hdr.CreditRequest = cpu_to_le16(1);
4074
4075         iov[0].iov_len = total_len;
4076         iov[0].iov_base = (char *)req;
4077
4078         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
4079                              server, CIFS_ECHO_OP, NULL);
4080         if (rc)
4081                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
4082
4083         cifs_small_buf_release(req);
4084         return rc;
4085 }
4086
4087 void
4088 SMB2_flush_free(struct smb_rqst *rqst)
4089 {
4090         if (rqst && rqst->rq_iov)
4091                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4092 }
4093
4094 int
4095 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
4096                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4097                 u64 persistent_fid, u64 volatile_fid)
4098 {
4099         struct smb2_flush_req *req;
4100         struct kvec *iov = rqst->rq_iov;
4101         unsigned int total_len;
4102         int rc;
4103
4104         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
4105                                  (void **) &req, &total_len);
4106         if (rc)
4107                 return rc;
4108
4109         req->PersistentFileId = persistent_fid;
4110         req->VolatileFileId = volatile_fid;
4111
4112         iov[0].iov_base = (char *)req;
4113         iov[0].iov_len = total_len;
4114
4115         return 0;
4116 }
4117
4118 int
4119 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4120            u64 volatile_fid)
4121 {
4122         struct cifs_ses *ses = tcon->ses;
4123         struct smb_rqst rqst;
4124         struct kvec iov[1];
4125         struct kvec rsp_iov = {NULL, 0};
4126         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4127         int resp_buftype = CIFS_NO_BUFFER;
4128         int flags = 0;
4129         int rc = 0;
4130
4131         cifs_dbg(FYI, "flush\n");
4132         if (!ses || !(ses->server))
4133                 return -EIO;
4134
4135         if (smb3_encryption_required(tcon))
4136                 flags |= CIFS_TRANSFORM_REQ;
4137
4138         memset(&rqst, 0, sizeof(struct smb_rqst));
4139         memset(&iov, 0, sizeof(iov));
4140         rqst.rq_iov = iov;
4141         rqst.rq_nvec = 1;
4142
4143         rc = SMB2_flush_init(xid, &rqst, tcon, server,
4144                              persistent_fid, volatile_fid);
4145         if (rc)
4146                 goto flush_exit;
4147
4148         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4149         rc = cifs_send_recv(xid, ses, server,
4150                             &rqst, &resp_buftype, flags, &rsp_iov);
4151
4152         if (rc != 0) {
4153                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4154                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4155                                      rc);
4156         } else
4157                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4158                                       ses->Suid);
4159
4160  flush_exit:
4161         SMB2_flush_free(&rqst);
4162         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4163         return rc;
4164 }
4165
4166 #ifdef CONFIG_CIFS_SMB_DIRECT
4167 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
4168 {
4169         struct TCP_Server_Info *server = io_parms->server;
4170         struct cifs_tcon *tcon = io_parms->tcon;
4171
4172         /* we can only offload if we're connected */
4173         if (!server || !tcon)
4174                 return false;
4175
4176         /* we can only offload on an rdma connection */
4177         if (!server->rdma || !server->smbd_conn)
4178                 return false;
4179
4180         /* we don't support signed offload yet */
4181         if (server->sign)
4182                 return false;
4183
4184         /* we don't support encrypted offload yet */
4185         if (smb3_encryption_required(tcon))
4186                 return false;
4187
4188         /* offload also has its overhead, so only do it if desired */
4189         if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)
4190                 return false;
4191
4192         return true;
4193 }
4194 #endif /* CONFIG_CIFS_SMB_DIRECT */
4195
4196 /*
4197  * To form a chain of read requests, any read requests after the first should
4198  * have the end_of_chain boolean set to true.
4199  */
4200 static int
4201 smb2_new_read_req(void **buf, unsigned int *total_len,
4202         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
4203         unsigned int remaining_bytes, int request_type)
4204 {
4205         int rc = -EACCES;
4206         struct smb2_read_req *req = NULL;
4207         struct smb2_hdr *shdr;
4208         struct TCP_Server_Info *server = io_parms->server;
4209
4210         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4211                                  (void **) &req, total_len);
4212         if (rc)
4213                 return rc;
4214
4215         if (server == NULL)
4216                 return -ECONNABORTED;
4217
4218         shdr = &req->hdr;
4219         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4220
4221         req->PersistentFileId = io_parms->persistent_fid;
4222         req->VolatileFileId = io_parms->volatile_fid;
4223         req->ReadChannelInfoOffset = 0; /* reserved */
4224         req->ReadChannelInfoLength = 0; /* reserved */
4225         req->Channel = 0; /* reserved */
4226         req->MinimumCount = 0;
4227         req->Length = cpu_to_le32(io_parms->length);
4228         req->Offset = cpu_to_le64(io_parms->offset);
4229
4230         trace_smb3_read_enter(0 /* xid */,
4231                         io_parms->persistent_fid,
4232                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4233                         io_parms->offset, io_parms->length);
4234 #ifdef CONFIG_CIFS_SMB_DIRECT
4235         /*
4236          * If we want to do a RDMA write, fill in and append
4237          * smbd_buffer_descriptor_v1 to the end of read request
4238          */
4239         if (smb3_use_rdma_offload(io_parms)) {
4240                 struct smbd_buffer_descriptor_v1 *v1;
4241                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4242
4243                 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->iter,
4244                                              true, need_invalidate);
4245                 if (!rdata->mr)
4246                         return -EAGAIN;
4247
4248                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4249                 if (need_invalidate)
4250                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4251                 req->ReadChannelInfoOffset =
4252                         cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4253                 req->ReadChannelInfoLength =
4254                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4255                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4256                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4257                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4258                 v1->length = cpu_to_le32(rdata->mr->mr->length);
4259
4260                 *total_len += sizeof(*v1) - 1;
4261         }
4262 #endif
4263         if (request_type & CHAINED_REQUEST) {
4264                 if (!(request_type & END_OF_CHAIN)) {
4265                         /* next 8-byte aligned request */
4266                         *total_len = ALIGN(*total_len, 8);
4267                         shdr->NextCommand = cpu_to_le32(*total_len);
4268                 } else /* END_OF_CHAIN */
4269                         shdr->NextCommand = 0;
4270                 if (request_type & RELATED_REQUEST) {
4271                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4272                         /*
4273                          * Related requests use info from previous read request
4274                          * in chain.
4275                          */
4276                         shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4277                         shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4278                         req->PersistentFileId = (u64)-1;
4279                         req->VolatileFileId = (u64)-1;
4280                 }
4281         }
4282         if (remaining_bytes > io_parms->length)
4283                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
4284         else
4285                 req->RemainingBytes = 0;
4286
4287         *buf = req;
4288         return rc;
4289 }
4290
4291 static void
4292 smb2_readv_callback(struct mid_q_entry *mid)
4293 {
4294         struct cifs_readdata *rdata = mid->callback_data;
4295         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4296         struct TCP_Server_Info *server = rdata->server;
4297         struct smb2_hdr *shdr =
4298                                 (struct smb2_hdr *)rdata->iov[0].iov_base;
4299         struct cifs_credits credits = { .value = 0, .instance = 0 };
4300         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
4301
4302         if (rdata->got_bytes) {
4303                 rqst.rq_iter      = rdata->iter;
4304                 rqst.rq_iter_size = iov_iter_count(&rdata->iter);
4305         }
4306
4307         WARN_ONCE(rdata->server != mid->server,
4308                   "rdata server %p != mid server %p",
4309                   rdata->server, mid->server);
4310
4311         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
4312                  __func__, mid->mid, mid->mid_state, rdata->result,
4313                  rdata->bytes);
4314
4315         switch (mid->mid_state) {
4316         case MID_RESPONSE_RECEIVED:
4317                 credits.value = le16_to_cpu(shdr->CreditRequest);
4318                 credits.instance = server->reconnect_instance;
4319                 /* result already set, check signature */
4320                 if (server->sign && !mid->decrypted) {
4321                         int rc;
4322
4323                         iov_iter_revert(&rqst.rq_iter, rdata->got_bytes);
4324                         iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
4325                         rc = smb2_verify_signature(&rqst, server);
4326                         if (rc)
4327                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4328                                          rc);
4329                 }
4330                 /* FIXME: should this be counted toward the initiating task? */
4331                 task_io_account_read(rdata->got_bytes);
4332                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4333                 break;
4334         case MID_REQUEST_SUBMITTED:
4335         case MID_RETRY_NEEDED:
4336                 rdata->result = -EAGAIN;
4337                 if (server->sign && rdata->got_bytes)
4338                         /* reset bytes number since we can not check a sign */
4339                         rdata->got_bytes = 0;
4340                 /* FIXME: should this be counted toward the initiating task? */
4341                 task_io_account_read(rdata->got_bytes);
4342                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4343                 break;
4344         case MID_RESPONSE_MALFORMED:
4345                 credits.value = le16_to_cpu(shdr->CreditRequest);
4346                 credits.instance = server->reconnect_instance;
4347                 fallthrough;
4348         default:
4349                 rdata->result = -EIO;
4350         }
4351 #ifdef CONFIG_CIFS_SMB_DIRECT
4352         /*
4353          * If this rdata has a memmory registered, the MR can be freed
4354          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4355          * because they have limited number and are used for future I/Os
4356          */
4357         if (rdata->mr) {
4358                 smbd_deregister_mr(rdata->mr);
4359                 rdata->mr = NULL;
4360         }
4361 #endif
4362         if (rdata->result && rdata->result != -ENODATA) {
4363                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4364                 trace_smb3_read_err(0 /* xid */,
4365                                     rdata->cfile->fid.persistent_fid,
4366                                     tcon->tid, tcon->ses->Suid, rdata->offset,
4367                                     rdata->bytes, rdata->result);
4368         } else
4369                 trace_smb3_read_done(0 /* xid */,
4370                                      rdata->cfile->fid.persistent_fid,
4371                                      tcon->tid, tcon->ses->Suid,
4372                                      rdata->offset, rdata->got_bytes);
4373
4374         queue_work(cifsiod_wq, &rdata->work);
4375         release_mid(mid);
4376         add_credits(server, &credits, 0);
4377 }
4378
4379 /* smb2_async_readv - send an async read, and set up mid to handle result */
4380 int
4381 smb2_async_readv(struct cifs_readdata *rdata)
4382 {
4383         int rc, flags = 0;
4384         char *buf;
4385         struct smb2_hdr *shdr;
4386         struct cifs_io_parms io_parms;
4387         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4388                                  .rq_nvec = 1 };
4389         struct TCP_Server_Info *server;
4390         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4391         unsigned int total_len;
4392         int credit_request;
4393
4394         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4395                  __func__, rdata->offset, rdata->bytes);
4396
4397         if (!rdata->server)
4398                 rdata->server = cifs_pick_channel(tcon->ses);
4399
4400         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4401         io_parms.server = server = rdata->server;
4402         io_parms.offset = rdata->offset;
4403         io_parms.length = rdata->bytes;
4404         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4405         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4406         io_parms.pid = rdata->pid;
4407
4408         rc = smb2_new_read_req(
4409                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4410         if (rc)
4411                 return rc;
4412
4413         if (smb3_encryption_required(io_parms.tcon))
4414                 flags |= CIFS_TRANSFORM_REQ;
4415
4416         rdata->iov[0].iov_base = buf;
4417         rdata->iov[0].iov_len = total_len;
4418
4419         shdr = (struct smb2_hdr *)buf;
4420
4421         if (rdata->credits.value > 0) {
4422                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4423                                                 SMB2_MAX_BUFFER_SIZE));
4424                 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4425                 if (server->credits >= server->max_credits)
4426                         shdr->CreditRequest = cpu_to_le16(0);
4427                 else
4428                         shdr->CreditRequest = cpu_to_le16(
4429                                 min_t(int, server->max_credits -
4430                                                 server->credits, credit_request));
4431
4432                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4433                 if (rc)
4434                         goto async_readv_out;
4435
4436                 flags |= CIFS_HAS_CREDITS;
4437         }
4438
4439         kref_get(&rdata->refcount);
4440         rc = cifs_call_async(server, &rqst,
4441                              cifs_readv_receive, smb2_readv_callback,
4442                              smb3_handle_read_data, rdata, flags,
4443                              &rdata->credits);
4444         if (rc) {
4445                 kref_put(&rdata->refcount, cifs_readdata_release);
4446                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4447                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4448                                     io_parms.tcon->tid,
4449                                     io_parms.tcon->ses->Suid,
4450                                     io_parms.offset, io_parms.length, rc);
4451         }
4452
4453 async_readv_out:
4454         cifs_small_buf_release(buf);
4455         return rc;
4456 }
4457
4458 int
4459 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4460           unsigned int *nbytes, char **buf, int *buf_type)
4461 {
4462         struct smb_rqst rqst;
4463         int resp_buftype, rc;
4464         struct smb2_read_req *req = NULL;
4465         struct smb2_read_rsp *rsp = NULL;
4466         struct kvec iov[1];
4467         struct kvec rsp_iov;
4468         unsigned int total_len;
4469         int flags = CIFS_LOG_ERROR;
4470         struct cifs_ses *ses = io_parms->tcon->ses;
4471
4472         if (!io_parms->server)
4473                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4474
4475         *nbytes = 0;
4476         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4477         if (rc)
4478                 return rc;
4479
4480         if (smb3_encryption_required(io_parms->tcon))
4481                 flags |= CIFS_TRANSFORM_REQ;
4482
4483         iov[0].iov_base = (char *)req;
4484         iov[0].iov_len = total_len;
4485
4486         memset(&rqst, 0, sizeof(struct smb_rqst));
4487         rqst.rq_iov = iov;
4488         rqst.rq_nvec = 1;
4489
4490         rc = cifs_send_recv(xid, ses, io_parms->server,
4491                             &rqst, &resp_buftype, flags, &rsp_iov);
4492         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4493
4494         if (rc) {
4495                 if (rc != -ENODATA) {
4496                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4497                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4498                         trace_smb3_read_err(xid,
4499                                             req->PersistentFileId,
4500                                             io_parms->tcon->tid, ses->Suid,
4501                                             io_parms->offset, io_parms->length,
4502                                             rc);
4503                 } else
4504                         trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid,
4505                                              ses->Suid, io_parms->offset, 0);
4506                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4507                 cifs_small_buf_release(req);
4508                 return rc == -ENODATA ? 0 : rc;
4509         } else
4510                 trace_smb3_read_done(xid,
4511                                     req->PersistentFileId,
4512                                     io_parms->tcon->tid, ses->Suid,
4513                                     io_parms->offset, io_parms->length);
4514
4515         cifs_small_buf_release(req);
4516
4517         *nbytes = le32_to_cpu(rsp->DataLength);
4518         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4519             (*nbytes > io_parms->length)) {
4520                 cifs_dbg(FYI, "bad length %d for count %d\n",
4521                          *nbytes, io_parms->length);
4522                 rc = -EIO;
4523                 *nbytes = 0;
4524         }
4525
4526         if (*buf) {
4527                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4528                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4529         } else if (resp_buftype != CIFS_NO_BUFFER) {
4530                 *buf = rsp_iov.iov_base;
4531                 if (resp_buftype == CIFS_SMALL_BUFFER)
4532                         *buf_type = CIFS_SMALL_BUFFER;
4533                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4534                         *buf_type = CIFS_LARGE_BUFFER;
4535         }
4536         return rc;
4537 }
4538
4539 /*
4540  * Check the mid_state and signature on received buffer (if any), and queue the
4541  * workqueue completion task.
4542  */
4543 static void
4544 smb2_writev_callback(struct mid_q_entry *mid)
4545 {
4546         struct cifs_writedata *wdata = mid->callback_data;
4547         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4548         struct TCP_Server_Info *server = wdata->server;
4549         unsigned int written;
4550         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4551         struct cifs_credits credits = { .value = 0, .instance = 0 };
4552
4553         WARN_ONCE(wdata->server != mid->server,
4554                   "wdata server %p != mid server %p",
4555                   wdata->server, mid->server);
4556
4557         switch (mid->mid_state) {
4558         case MID_RESPONSE_RECEIVED:
4559                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4560                 credits.instance = server->reconnect_instance;
4561                 wdata->result = smb2_check_receive(mid, server, 0);
4562                 if (wdata->result != 0)
4563                         break;
4564
4565                 written = le32_to_cpu(rsp->DataLength);
4566                 /*
4567                  * Mask off high 16 bits when bytes written as returned
4568                  * by the server is greater than bytes requested by the
4569                  * client. OS/2 servers are known to set incorrect
4570                  * CountHigh values.
4571                  */
4572                 if (written > wdata->bytes)
4573                         written &= 0xFFFF;
4574
4575                 if (written < wdata->bytes)
4576                         wdata->result = -ENOSPC;
4577                 else
4578                         wdata->bytes = written;
4579                 break;
4580         case MID_REQUEST_SUBMITTED:
4581         case MID_RETRY_NEEDED:
4582                 wdata->result = -EAGAIN;
4583                 break;
4584         case MID_RESPONSE_MALFORMED:
4585                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4586                 credits.instance = server->reconnect_instance;
4587                 fallthrough;
4588         default:
4589                 wdata->result = -EIO;
4590                 break;
4591         }
4592 #ifdef CONFIG_CIFS_SMB_DIRECT
4593         /*
4594          * If this wdata has a memory registered, the MR can be freed
4595          * The number of MRs available is limited, it's important to recover
4596          * used MR as soon as I/O is finished. Hold MR longer in the later
4597          * I/O process can possibly result in I/O deadlock due to lack of MR
4598          * to send request on I/O retry
4599          */
4600         if (wdata->mr) {
4601                 smbd_deregister_mr(wdata->mr);
4602                 wdata->mr = NULL;
4603         }
4604 #endif
4605         if (wdata->result) {
4606                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4607                 trace_smb3_write_err(0 /* no xid */,
4608                                      wdata->cfile->fid.persistent_fid,
4609                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4610                                      wdata->bytes, wdata->result);
4611                 if (wdata->result == -ENOSPC)
4612                         pr_warn_once("Out of space writing to %s\n",
4613                                      tcon->tree_name);
4614         } else
4615                 trace_smb3_write_done(0 /* no xid */,
4616                                       wdata->cfile->fid.persistent_fid,
4617                                       tcon->tid, tcon->ses->Suid,
4618                                       wdata->offset, wdata->bytes);
4619
4620         queue_work(cifsiod_wq, &wdata->work);
4621         release_mid(mid);
4622         add_credits(server, &credits, 0);
4623 }
4624
4625 /* smb2_async_writev - send an async write, and set up mid to handle result */
4626 int
4627 smb2_async_writev(struct cifs_writedata *wdata,
4628                   void (*release)(struct kref *kref))
4629 {
4630         int rc = -EACCES, flags = 0;
4631         struct smb2_write_req *req = NULL;
4632         struct smb2_hdr *shdr;
4633         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4634         struct TCP_Server_Info *server = wdata->server;
4635         struct kvec iov[1];
4636         struct smb_rqst rqst = { };
4637         unsigned int total_len;
4638         struct cifs_io_parms _io_parms;
4639         struct cifs_io_parms *io_parms = NULL;
4640         int credit_request;
4641
4642         if (!wdata->server)
4643                 server = wdata->server = cifs_pick_channel(tcon->ses);
4644
4645         /*
4646          * in future we may get cifs_io_parms passed in from the caller,
4647          * but for now we construct it here...
4648          */
4649         _io_parms = (struct cifs_io_parms) {
4650                 .tcon = tcon,
4651                 .server = server,
4652                 .offset = wdata->offset,
4653                 .length = wdata->bytes,
4654                 .persistent_fid = wdata->cfile->fid.persistent_fid,
4655                 .volatile_fid = wdata->cfile->fid.volatile_fid,
4656                 .pid = wdata->pid,
4657         };
4658         io_parms = &_io_parms;
4659
4660         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4661                                  (void **) &req, &total_len);
4662         if (rc)
4663                 return rc;
4664
4665         if (smb3_encryption_required(tcon))
4666                 flags |= CIFS_TRANSFORM_REQ;
4667
4668         shdr = (struct smb2_hdr *)req;
4669         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4670
4671         req->PersistentFileId = io_parms->persistent_fid;
4672         req->VolatileFileId = io_parms->volatile_fid;
4673         req->WriteChannelInfoOffset = 0;
4674         req->WriteChannelInfoLength = 0;
4675         req->Channel = SMB2_CHANNEL_NONE;
4676         req->Offset = cpu_to_le64(io_parms->offset);
4677         req->DataOffset = cpu_to_le16(
4678                                 offsetof(struct smb2_write_req, Buffer));
4679         req->RemainingBytes = 0;
4680
4681         trace_smb3_write_enter(0 /* xid */,
4682                                io_parms->persistent_fid,
4683                                io_parms->tcon->tid,
4684                                io_parms->tcon->ses->Suid,
4685                                io_parms->offset,
4686                                io_parms->length);
4687
4688 #ifdef CONFIG_CIFS_SMB_DIRECT
4689         /*
4690          * If we want to do a server RDMA read, fill in and append
4691          * smbd_buffer_descriptor_v1 to the end of write request
4692          */
4693         if (smb3_use_rdma_offload(io_parms)) {
4694                 struct smbd_buffer_descriptor_v1 *v1;
4695                 size_t data_size = iov_iter_count(&wdata->iter);
4696                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4697
4698                 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->iter,
4699                                              false, need_invalidate);
4700                 if (!wdata->mr) {
4701                         rc = -EAGAIN;
4702                         goto async_writev_out;
4703                 }
4704                 req->Length = 0;
4705                 req->DataOffset = 0;
4706                 req->RemainingBytes = cpu_to_le32(data_size);
4707                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4708                 if (need_invalidate)
4709                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4710                 req->WriteChannelInfoOffset =
4711                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4712                 req->WriteChannelInfoLength =
4713                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4714                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4715                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4716                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4717                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4718         }
4719 #endif
4720         iov[0].iov_len = total_len - 1;
4721         iov[0].iov_base = (char *)req;
4722
4723         rqst.rq_iov = iov;
4724         rqst.rq_nvec = 1;
4725         rqst.rq_iter = wdata->iter;
4726         rqst.rq_iter_size = iov_iter_count(&rqst.rq_iter);
4727 #ifdef CONFIG_CIFS_SMB_DIRECT
4728         if (wdata->mr)
4729                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4730 #endif
4731         cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
4732                  io_parms->offset, io_parms->length, iov_iter_count(&rqst.rq_iter));
4733
4734 #ifdef CONFIG_CIFS_SMB_DIRECT
4735         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4736         if (!wdata->mr)
4737                 req->Length = cpu_to_le32(io_parms->length);
4738 #else
4739         req->Length = cpu_to_le32(io_parms->length);
4740 #endif
4741
4742         if (wdata->credits.value > 0) {
4743                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4744                                                     SMB2_MAX_BUFFER_SIZE));
4745                 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4746                 if (server->credits >= server->max_credits)
4747                         shdr->CreditRequest = cpu_to_le16(0);
4748                 else
4749                         shdr->CreditRequest = cpu_to_le16(
4750                                 min_t(int, server->max_credits -
4751                                                 server->credits, credit_request));
4752
4753                 rc = adjust_credits(server, &wdata->credits, io_parms->length);
4754                 if (rc)
4755                         goto async_writev_out;
4756
4757                 flags |= CIFS_HAS_CREDITS;
4758         }
4759
4760         kref_get(&wdata->refcount);
4761         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4762                              wdata, flags, &wdata->credits);
4763
4764         if (rc) {
4765                 trace_smb3_write_err(0 /* no xid */,
4766                                      io_parms->persistent_fid,
4767                                      io_parms->tcon->tid,
4768                                      io_parms->tcon->ses->Suid,
4769                                      io_parms->offset,
4770                                      io_parms->length,
4771                                      rc);
4772                 kref_put(&wdata->refcount, release);
4773                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4774         }
4775
4776 async_writev_out:
4777         cifs_small_buf_release(req);
4778         return rc;
4779 }
4780
4781 /*
4782  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4783  * The length field from io_parms must be at least 1 and indicates a number of
4784  * elements with data to write that begins with position 1 in iov array. All
4785  * data length is specified by count.
4786  */
4787 int
4788 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4789            unsigned int *nbytes, struct kvec *iov, int n_vec)
4790 {
4791         struct smb_rqst rqst;
4792         int rc = 0;
4793         struct smb2_write_req *req = NULL;
4794         struct smb2_write_rsp *rsp = NULL;
4795         int resp_buftype;
4796         struct kvec rsp_iov;
4797         int flags = 0;
4798         unsigned int total_len;
4799         struct TCP_Server_Info *server;
4800
4801         *nbytes = 0;
4802
4803         if (n_vec < 1)
4804                 return rc;
4805
4806         if (!io_parms->server)
4807                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4808         server = io_parms->server;
4809         if (server == NULL)
4810                 return -ECONNABORTED;
4811
4812         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4813                                  (void **) &req, &total_len);
4814         if (rc)
4815                 return rc;
4816
4817         if (smb3_encryption_required(io_parms->tcon))
4818                 flags |= CIFS_TRANSFORM_REQ;
4819
4820         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4821
4822         req->PersistentFileId = io_parms->persistent_fid;
4823         req->VolatileFileId = io_parms->volatile_fid;
4824         req->WriteChannelInfoOffset = 0;
4825         req->WriteChannelInfoLength = 0;
4826         req->Channel = 0;
4827         req->Length = cpu_to_le32(io_parms->length);
4828         req->Offset = cpu_to_le64(io_parms->offset);
4829         req->DataOffset = cpu_to_le16(
4830                                 offsetof(struct smb2_write_req, Buffer));
4831         req->RemainingBytes = 0;
4832
4833         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4834                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4835                 io_parms->offset, io_parms->length);
4836
4837         iov[0].iov_base = (char *)req;
4838         /* 1 for Buffer */
4839         iov[0].iov_len = total_len - 1;
4840
4841         memset(&rqst, 0, sizeof(struct smb_rqst));
4842         rqst.rq_iov = iov;
4843         rqst.rq_nvec = n_vec + 1;
4844
4845         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4846                             &rqst,
4847                             &resp_buftype, flags, &rsp_iov);
4848         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4849
4850         if (rc) {
4851                 trace_smb3_write_err(xid,
4852                                      req->PersistentFileId,
4853                                      io_parms->tcon->tid,
4854                                      io_parms->tcon->ses->Suid,
4855                                      io_parms->offset, io_parms->length, rc);
4856                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4857                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4858         } else {
4859                 *nbytes = le32_to_cpu(rsp->DataLength);
4860                 trace_smb3_write_done(xid,
4861                                       req->PersistentFileId,
4862                                       io_parms->tcon->tid,
4863                                       io_parms->tcon->ses->Suid,
4864                                       io_parms->offset, *nbytes);
4865         }
4866
4867         cifs_small_buf_release(req);
4868         free_rsp_buf(resp_buftype, rsp);
4869         return rc;
4870 }
4871
4872 int posix_info_sid_size(const void *beg, const void *end)
4873 {
4874         size_t subauth;
4875         int total;
4876
4877         if (beg + 1 > end)
4878                 return -1;
4879
4880         subauth = *(u8 *)(beg+1);
4881         if (subauth < 1 || subauth > 15)
4882                 return -1;
4883
4884         total = 1 + 1 + 6 + 4*subauth;
4885         if (beg + total > end)
4886                 return -1;
4887
4888         return total;
4889 }
4890
4891 int posix_info_parse(const void *beg, const void *end,
4892                      struct smb2_posix_info_parsed *out)
4893
4894 {
4895         int total_len = 0;
4896         int owner_len, group_len;
4897         int name_len;
4898         const void *owner_sid;
4899         const void *group_sid;
4900         const void *name;
4901
4902         /* if no end bound given, assume payload to be correct */
4903         if (!end) {
4904                 const struct smb2_posix_info *p = beg;
4905
4906                 end = beg + le32_to_cpu(p->NextEntryOffset);
4907                 /* last element will have a 0 offset, pick a sensible bound */
4908                 if (end == beg)
4909                         end += 0xFFFF;
4910         }
4911
4912         /* check base buf */
4913         if (beg + sizeof(struct smb2_posix_info) > end)
4914                 return -1;
4915         total_len = sizeof(struct smb2_posix_info);
4916
4917         /* check owner sid */
4918         owner_sid = beg + total_len;
4919         owner_len = posix_info_sid_size(owner_sid, end);
4920         if (owner_len < 0)
4921                 return -1;
4922         total_len += owner_len;
4923
4924         /* check group sid */
4925         group_sid = beg + total_len;
4926         group_len = posix_info_sid_size(group_sid, end);
4927         if (group_len < 0)
4928                 return -1;
4929         total_len += group_len;
4930
4931         /* check name len */
4932         if (beg + total_len + 4 > end)
4933                 return -1;
4934         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4935         if (name_len < 1 || name_len > 0xFFFF)
4936                 return -1;
4937         total_len += 4;
4938
4939         /* check name */
4940         name = beg + total_len;
4941         if (name + name_len > end)
4942                 return -1;
4943         total_len += name_len;
4944
4945         if (out) {
4946                 out->base = beg;
4947                 out->size = total_len;
4948                 out->name_len = name_len;
4949                 out->name = name;
4950                 memcpy(&out->owner, owner_sid, owner_len);
4951                 memcpy(&out->group, group_sid, group_len);
4952         }
4953         return total_len;
4954 }
4955
4956 static int posix_info_extra_size(const void *beg, const void *end)
4957 {
4958         int len = posix_info_parse(beg, end, NULL);
4959
4960         if (len < 0)
4961                 return -1;
4962         return len - sizeof(struct smb2_posix_info);
4963 }
4964
4965 static unsigned int
4966 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4967             size_t size)
4968 {
4969         int len;
4970         unsigned int entrycount = 0;
4971         unsigned int next_offset = 0;
4972         char *entryptr;
4973         FILE_DIRECTORY_INFO *dir_info;
4974
4975         if (bufstart == NULL)
4976                 return 0;
4977
4978         entryptr = bufstart;
4979
4980         while (1) {
4981                 if (entryptr + next_offset < entryptr ||
4982                     entryptr + next_offset > end_of_buf ||
4983                     entryptr + next_offset + size > end_of_buf) {
4984                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4985                         break;
4986                 }
4987
4988                 entryptr = entryptr + next_offset;
4989                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4990
4991                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4992                         len = posix_info_extra_size(entryptr, end_of_buf);
4993                 else
4994                         len = le32_to_cpu(dir_info->FileNameLength);
4995
4996                 if (len < 0 ||
4997                     entryptr + len < entryptr ||
4998                     entryptr + len > end_of_buf ||
4999                     entryptr + len + size > end_of_buf) {
5000                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
5001                                  end_of_buf);
5002                         break;
5003                 }
5004
5005                 *lastentry = entryptr;
5006                 entrycount++;
5007
5008                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
5009                 if (!next_offset)
5010                         break;
5011         }
5012
5013         return entrycount;
5014 }
5015
5016 /*
5017  * Readdir/FindFirst
5018  */
5019 int SMB2_query_directory_init(const unsigned int xid,
5020                               struct cifs_tcon *tcon,
5021                               struct TCP_Server_Info *server,
5022                               struct smb_rqst *rqst,
5023                               u64 persistent_fid, u64 volatile_fid,
5024                               int index, int info_level)
5025 {
5026         struct smb2_query_directory_req *req;
5027         unsigned char *bufptr;
5028         __le16 asteriks = cpu_to_le16('*');
5029         unsigned int output_size = CIFSMaxBufSize -
5030                 MAX_SMB2_CREATE_RESPONSE_SIZE -
5031                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
5032         unsigned int total_len;
5033         struct kvec *iov = rqst->rq_iov;
5034         int len, rc;
5035
5036         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
5037                                  (void **) &req, &total_len);
5038         if (rc)
5039                 return rc;
5040
5041         switch (info_level) {
5042         case SMB_FIND_FILE_DIRECTORY_INFO:
5043                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
5044                 break;
5045         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5046                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
5047                 break;
5048         case SMB_FIND_FILE_POSIX_INFO:
5049                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
5050                 break;
5051         default:
5052                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5053                         info_level);
5054                 return -EINVAL;
5055         }
5056
5057         req->FileIndex = cpu_to_le32(index);
5058         req->PersistentFileId = persistent_fid;
5059         req->VolatileFileId = volatile_fid;
5060
5061         len = 0x2;
5062         bufptr = req->Buffer;
5063         memcpy(bufptr, &asteriks, len);
5064
5065         req->FileNameOffset =
5066                 cpu_to_le16(sizeof(struct smb2_query_directory_req));
5067         req->FileNameLength = cpu_to_le16(len);
5068         /*
5069          * BB could be 30 bytes or so longer if we used SMB2 specific
5070          * buffer lengths, but this is safe and close enough.
5071          */
5072         output_size = min_t(unsigned int, output_size, server->maxBuf);
5073         output_size = min_t(unsigned int, output_size, 2 << 15);
5074         req->OutputBufferLength = cpu_to_le32(output_size);
5075
5076         iov[0].iov_base = (char *)req;
5077         /* 1 for Buffer */
5078         iov[0].iov_len = total_len - 1;
5079
5080         iov[1].iov_base = (char *)(req->Buffer);
5081         iov[1].iov_len = len;
5082
5083         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
5084                         tcon->ses->Suid, index, output_size);
5085
5086         return 0;
5087 }
5088
5089 void SMB2_query_directory_free(struct smb_rqst *rqst)
5090 {
5091         if (rqst && rqst->rq_iov) {
5092                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
5093         }
5094 }
5095
5096 int
5097 smb2_parse_query_directory(struct cifs_tcon *tcon,
5098                            struct kvec *rsp_iov,
5099                            int resp_buftype,
5100                            struct cifs_search_info *srch_inf)
5101 {
5102         struct smb2_query_directory_rsp *rsp;
5103         size_t info_buf_size;
5104         char *end_of_smb;
5105         int rc;
5106
5107         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
5108
5109         switch (srch_inf->info_level) {
5110         case SMB_FIND_FILE_DIRECTORY_INFO:
5111                 info_buf_size = sizeof(FILE_DIRECTORY_INFO);
5112                 break;
5113         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5114                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
5115                 break;
5116         case SMB_FIND_FILE_POSIX_INFO:
5117                 /* note that posix payload are variable size */
5118                 info_buf_size = sizeof(struct smb2_posix_info);
5119                 break;
5120         default:
5121                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5122                          srch_inf->info_level);
5123                 return -EINVAL;
5124         }
5125
5126         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5127                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
5128                                info_buf_size);
5129         if (rc) {
5130                 cifs_tcon_dbg(VFS, "bad info payload");
5131                 return rc;
5132         }
5133
5134         srch_inf->unicode = true;
5135
5136         if (srch_inf->ntwrk_buf_start) {
5137                 if (srch_inf->smallBuf)
5138                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
5139                 else
5140                         cifs_buf_release(srch_inf->ntwrk_buf_start);
5141         }
5142         srch_inf->ntwrk_buf_start = (char *)rsp;
5143         srch_inf->srch_entries_start = srch_inf->last_entry =
5144                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
5145         end_of_smb = rsp_iov->iov_len + (char *)rsp;
5146
5147         srch_inf->entries_in_buffer = num_entries(
5148                 srch_inf->info_level,
5149                 srch_inf->srch_entries_start,
5150                 end_of_smb,
5151                 &srch_inf->last_entry,
5152                 info_buf_size);
5153
5154         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
5155         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
5156                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
5157                  srch_inf->srch_entries_start, srch_inf->last_entry);
5158         if (resp_buftype == CIFS_LARGE_BUFFER)
5159                 srch_inf->smallBuf = false;
5160         else if (resp_buftype == CIFS_SMALL_BUFFER)
5161                 srch_inf->smallBuf = true;
5162         else
5163                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
5164
5165         return 0;
5166 }
5167
5168 int
5169 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5170                      u64 persistent_fid, u64 volatile_fid, int index,
5171                      struct cifs_search_info *srch_inf)
5172 {
5173         struct smb_rqst rqst;
5174         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5175         struct smb2_query_directory_rsp *rsp = NULL;
5176         int resp_buftype = CIFS_NO_BUFFER;
5177         struct kvec rsp_iov;
5178         int rc = 0;
5179         struct cifs_ses *ses = tcon->ses;
5180         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5181         int flags = 0;
5182
5183         if (!ses || !(ses->server))
5184                 return -EIO;
5185
5186         if (smb3_encryption_required(tcon))
5187                 flags |= CIFS_TRANSFORM_REQ;
5188
5189         memset(&rqst, 0, sizeof(struct smb_rqst));
5190         memset(&iov, 0, sizeof(iov));
5191         rqst.rq_iov = iov;
5192         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5193
5194         rc = SMB2_query_directory_init(xid, tcon, server,
5195                                        &rqst, persistent_fid,
5196                                        volatile_fid, index,
5197                                        srch_inf->info_level);
5198         if (rc)
5199                 goto qdir_exit;
5200
5201         rc = cifs_send_recv(xid, ses, server,
5202                             &rqst, &resp_buftype, flags, &rsp_iov);
5203         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5204
5205         if (rc) {
5206                 if (rc == -ENODATA &&
5207                     rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5208                         trace_smb3_query_dir_done(xid, persistent_fid,
5209                                 tcon->tid, tcon->ses->Suid, index, 0);
5210                         srch_inf->endOfSearch = true;
5211                         rc = 0;
5212                 } else {
5213                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5214                                 tcon->ses->Suid, index, 0, rc);
5215                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5216                 }
5217                 goto qdir_exit;
5218         }
5219
5220         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
5221                                         srch_inf);
5222         if (rc) {
5223                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5224                         tcon->ses->Suid, index, 0, rc);
5225                 goto qdir_exit;
5226         }
5227         resp_buftype = CIFS_NO_BUFFER;
5228
5229         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5230                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5231
5232 qdir_exit:
5233         SMB2_query_directory_free(&rqst);
5234         free_rsp_buf(resp_buftype, rsp);
5235         return rc;
5236 }
5237
5238 int
5239 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5240                    struct smb_rqst *rqst,
5241                    u64 persistent_fid, u64 volatile_fid, u32 pid,
5242                    u8 info_class, u8 info_type, u32 additional_info,
5243                    void **data, unsigned int *size)
5244 {
5245         struct smb2_set_info_req *req;
5246         struct kvec *iov = rqst->rq_iov;
5247         unsigned int i, total_len;
5248         int rc;
5249
5250         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5251                                  (void **) &req, &total_len);
5252         if (rc)
5253                 return rc;
5254
5255         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5256         req->InfoType = info_type;
5257         req->FileInfoClass = info_class;
5258         req->PersistentFileId = persistent_fid;
5259         req->VolatileFileId = volatile_fid;
5260         req->AdditionalInformation = cpu_to_le32(additional_info);
5261
5262         req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
5263         req->BufferLength = cpu_to_le32(*size);
5264
5265         memcpy(req->Buffer, *data, *size);
5266         total_len += *size;
5267
5268         iov[0].iov_base = (char *)req;
5269         /* 1 for Buffer */
5270         iov[0].iov_len = total_len - 1;
5271
5272         for (i = 1; i < rqst->rq_nvec; i++) {
5273                 le32_add_cpu(&req->BufferLength, size[i]);
5274                 iov[i].iov_base = (char *)data[i];
5275                 iov[i].iov_len = size[i];
5276         }
5277
5278         return 0;
5279 }
5280
5281 void
5282 SMB2_set_info_free(struct smb_rqst *rqst)
5283 {
5284         if (rqst && rqst->rq_iov)
5285                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5286 }
5287
5288 static int
5289 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5290                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5291                u8 info_type, u32 additional_info, unsigned int num,
5292                 void **data, unsigned int *size)
5293 {
5294         struct smb_rqst rqst;
5295         struct smb2_set_info_rsp *rsp = NULL;
5296         struct kvec *iov;
5297         struct kvec rsp_iov;
5298         int rc = 0;
5299         int resp_buftype;
5300         struct cifs_ses *ses = tcon->ses;
5301         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5302         int flags = 0;
5303
5304         if (!ses || !server)
5305                 return -EIO;
5306
5307         if (!num)
5308                 return -EINVAL;
5309
5310         if (smb3_encryption_required(tcon))
5311                 flags |= CIFS_TRANSFORM_REQ;
5312
5313         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5314         if (!iov)
5315                 return -ENOMEM;
5316
5317         memset(&rqst, 0, sizeof(struct smb_rqst));
5318         rqst.rq_iov = iov;
5319         rqst.rq_nvec = num;
5320
5321         rc = SMB2_set_info_init(tcon, server,
5322                                 &rqst, persistent_fid, volatile_fid, pid,
5323                                 info_class, info_type, additional_info,
5324                                 data, size);
5325         if (rc) {
5326                 kfree(iov);
5327                 return rc;
5328         }
5329
5330
5331         rc = cifs_send_recv(xid, ses, server,
5332                             &rqst, &resp_buftype, flags,
5333                             &rsp_iov);
5334         SMB2_set_info_free(&rqst);
5335         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5336
5337         if (rc != 0) {
5338                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5339                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5340                                 ses->Suid, info_class, (__u32)info_type, rc);
5341         }
5342
5343         free_rsp_buf(resp_buftype, rsp);
5344         kfree(iov);
5345         return rc;
5346 }
5347
5348 int
5349 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5350              u64 volatile_fid, u32 pid, __le64 *eof)
5351 {
5352         struct smb2_file_eof_info info;
5353         void *data;
5354         unsigned int size;
5355
5356         info.EndOfFile = *eof;
5357
5358         data = &info;
5359         size = sizeof(struct smb2_file_eof_info);
5360
5361         trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, le64_to_cpu(*eof));
5362
5363         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5364                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5365                         0, 1, &data, &size);
5366 }
5367
5368 int
5369 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5370                 u64 persistent_fid, u64 volatile_fid,
5371                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5372 {
5373         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5374                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5375                         1, (void **)&pnntsd, &pacllen);
5376 }
5377
5378 int
5379 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5380             u64 persistent_fid, u64 volatile_fid,
5381             struct smb2_file_full_ea_info *buf, int len)
5382 {
5383         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5384                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5385                 0, 1, (void **)&buf, &len);
5386 }
5387
5388 int
5389 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5390                   const u64 persistent_fid, const u64 volatile_fid,
5391                   __u8 oplock_level)
5392 {
5393         struct smb_rqst rqst;
5394         int rc;
5395         struct smb2_oplock_break *req = NULL;
5396         struct cifs_ses *ses = tcon->ses;
5397         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5398         int flags = CIFS_OBREAK_OP;
5399         unsigned int total_len;
5400         struct kvec iov[1];
5401         struct kvec rsp_iov;
5402         int resp_buf_type;
5403
5404         cifs_dbg(FYI, "SMB2_oplock_break\n");
5405         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5406                                  (void **) &req, &total_len);
5407         if (rc)
5408                 return rc;
5409
5410         if (smb3_encryption_required(tcon))
5411                 flags |= CIFS_TRANSFORM_REQ;
5412
5413         req->VolatileFid = volatile_fid;
5414         req->PersistentFid = persistent_fid;
5415         req->OplockLevel = oplock_level;
5416         req->hdr.CreditRequest = cpu_to_le16(1);
5417
5418         flags |= CIFS_NO_RSP_BUF;
5419
5420         iov[0].iov_base = (char *)req;
5421         iov[0].iov_len = total_len;
5422
5423         memset(&rqst, 0, sizeof(struct smb_rqst));
5424         rqst.rq_iov = iov;
5425         rqst.rq_nvec = 1;
5426
5427         rc = cifs_send_recv(xid, ses, server,
5428                             &rqst, &resp_buf_type, flags, &rsp_iov);
5429         cifs_small_buf_release(req);
5430
5431         if (rc) {
5432                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5433                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5434         }
5435
5436         return rc;
5437 }
5438
5439 void
5440 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5441                              struct kstatfs *kst)
5442 {
5443         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5444                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5445         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5446         kst->f_bfree  = kst->f_bavail =
5447                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5448         return;
5449 }
5450
5451 static void
5452 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5453                         struct kstatfs *kst)
5454 {
5455         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5456         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5457         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5458         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5459                 kst->f_bavail = kst->f_bfree;
5460         else
5461                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5462         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5463                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5464         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5465                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5466
5467         return;
5468 }
5469
5470 static int
5471 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5472                    struct TCP_Server_Info *server,
5473                    int level, int outbuf_len, u64 persistent_fid,
5474                    u64 volatile_fid)
5475 {
5476         int rc;
5477         struct smb2_query_info_req *req;
5478         unsigned int total_len;
5479
5480         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5481
5482         if ((tcon->ses == NULL) || server == NULL)
5483                 return -EIO;
5484
5485         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5486                                  (void **) &req, &total_len);
5487         if (rc)
5488                 return rc;
5489
5490         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5491         req->FileInfoClass = level;
5492         req->PersistentFileId = persistent_fid;
5493         req->VolatileFileId = volatile_fid;
5494         /* 1 for pad */
5495         req->InputBufferOffset =
5496                         cpu_to_le16(sizeof(struct smb2_query_info_req));
5497         req->OutputBufferLength = cpu_to_le32(
5498                 outbuf_len + sizeof(struct smb2_query_info_rsp));
5499
5500         iov->iov_base = (char *)req;
5501         iov->iov_len = total_len;
5502         return 0;
5503 }
5504
5505 static inline void free_qfs_info_req(struct kvec *iov)
5506 {
5507         cifs_buf_release(iov->iov_base);
5508 }
5509
5510 int
5511 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5512               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5513 {
5514         struct smb_rqst rqst;
5515         struct smb2_query_info_rsp *rsp = NULL;
5516         struct kvec iov;
5517         struct kvec rsp_iov;
5518         int rc = 0;
5519         int resp_buftype;
5520         struct cifs_ses *ses = tcon->ses;
5521         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5522         FILE_SYSTEM_POSIX_INFO *info = NULL;
5523         int flags = 0;
5524
5525         rc = build_qfs_info_req(&iov, tcon, server,
5526                                 FS_POSIX_INFORMATION,
5527                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5528                                 persistent_fid, volatile_fid);
5529         if (rc)
5530                 return rc;
5531
5532         if (smb3_encryption_required(tcon))
5533                 flags |= CIFS_TRANSFORM_REQ;
5534
5535         memset(&rqst, 0, sizeof(struct smb_rqst));
5536         rqst.rq_iov = &iov;
5537         rqst.rq_nvec = 1;
5538
5539         rc = cifs_send_recv(xid, ses, server,
5540                             &rqst, &resp_buftype, flags, &rsp_iov);
5541         free_qfs_info_req(&iov);
5542         if (rc) {
5543                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5544                 goto posix_qfsinf_exit;
5545         }
5546         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5547
5548         info = (FILE_SYSTEM_POSIX_INFO *)(
5549                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5550         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5551                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5552                                sizeof(FILE_SYSTEM_POSIX_INFO));
5553         if (!rc)
5554                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5555
5556 posix_qfsinf_exit:
5557         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5558         return rc;
5559 }
5560
5561 int
5562 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5563               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5564 {
5565         struct smb_rqst rqst;
5566         struct smb2_query_info_rsp *rsp = NULL;
5567         struct kvec iov;
5568         struct kvec rsp_iov;
5569         int rc = 0;
5570         int resp_buftype;
5571         struct cifs_ses *ses = tcon->ses;
5572         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5573         struct smb2_fs_full_size_info *info = NULL;
5574         int flags = 0;
5575
5576         rc = build_qfs_info_req(&iov, tcon, server,
5577                                 FS_FULL_SIZE_INFORMATION,
5578                                 sizeof(struct smb2_fs_full_size_info),
5579                                 persistent_fid, volatile_fid);
5580         if (rc)
5581                 return rc;
5582
5583         if (smb3_encryption_required(tcon))
5584                 flags |= CIFS_TRANSFORM_REQ;
5585
5586         memset(&rqst, 0, sizeof(struct smb_rqst));
5587         rqst.rq_iov = &iov;
5588         rqst.rq_nvec = 1;
5589
5590         rc = cifs_send_recv(xid, ses, server,
5591                             &rqst, &resp_buftype, flags, &rsp_iov);
5592         free_qfs_info_req(&iov);
5593         if (rc) {
5594                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5595                 goto qfsinf_exit;
5596         }
5597         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5598
5599         info = (struct smb2_fs_full_size_info *)(
5600                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5601         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5602                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5603                                sizeof(struct smb2_fs_full_size_info));
5604         if (!rc)
5605                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5606
5607 qfsinf_exit:
5608         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5609         return rc;
5610 }
5611
5612 int
5613 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5614               u64 persistent_fid, u64 volatile_fid, int level)
5615 {
5616         struct smb_rqst rqst;
5617         struct smb2_query_info_rsp *rsp = NULL;
5618         struct kvec iov;
5619         struct kvec rsp_iov;
5620         int rc = 0;
5621         int resp_buftype, max_len, min_len;
5622         struct cifs_ses *ses = tcon->ses;
5623         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5624         unsigned int rsp_len, offset;
5625         int flags = 0;
5626
5627         if (level == FS_DEVICE_INFORMATION) {
5628                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5629                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5630         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5631                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5632                 min_len = MIN_FS_ATTR_INFO_SIZE;
5633         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5634                 max_len = sizeof(struct smb3_fs_ss_info);
5635                 min_len = sizeof(struct smb3_fs_ss_info);
5636         } else if (level == FS_VOLUME_INFORMATION) {
5637                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5638                 min_len = sizeof(struct smb3_fs_vol_info);
5639         } else {
5640                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5641                 return -EINVAL;
5642         }
5643
5644         rc = build_qfs_info_req(&iov, tcon, server,
5645                                 level, max_len,
5646                                 persistent_fid, volatile_fid);
5647         if (rc)
5648                 return rc;
5649
5650         if (smb3_encryption_required(tcon))
5651                 flags |= CIFS_TRANSFORM_REQ;
5652
5653         memset(&rqst, 0, sizeof(struct smb_rqst));
5654         rqst.rq_iov = &iov;
5655         rqst.rq_nvec = 1;
5656
5657         rc = cifs_send_recv(xid, ses, server,
5658                             &rqst, &resp_buftype, flags, &rsp_iov);
5659         free_qfs_info_req(&iov);
5660         if (rc) {
5661                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5662                 goto qfsattr_exit;
5663         }
5664         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5665
5666         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5667         offset = le16_to_cpu(rsp->OutputBufferOffset);
5668         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5669         if (rc)
5670                 goto qfsattr_exit;
5671
5672         if (level == FS_ATTRIBUTE_INFORMATION)
5673                 memcpy(&tcon->fsAttrInfo, offset
5674                         + (char *)rsp, min_t(unsigned int,
5675                         rsp_len, max_len));
5676         else if (level == FS_DEVICE_INFORMATION)
5677                 memcpy(&tcon->fsDevInfo, offset
5678                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5679         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5680                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5681                         (offset + (char *)rsp);
5682                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5683                 tcon->perf_sector_size =
5684                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5685         } else if (level == FS_VOLUME_INFORMATION) {
5686                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5687                         (offset + (char *)rsp);
5688                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5689                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5690         }
5691
5692 qfsattr_exit:
5693         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5694         return rc;
5695 }
5696
5697 int
5698 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5699            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5700            const __u32 num_lock, struct smb2_lock_element *buf)
5701 {
5702         struct smb_rqst rqst;
5703         int rc = 0;
5704         struct smb2_lock_req *req = NULL;
5705         struct kvec iov[2];
5706         struct kvec rsp_iov;
5707         int resp_buf_type;
5708         unsigned int count;
5709         int flags = CIFS_NO_RSP_BUF;
5710         unsigned int total_len;
5711         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5712
5713         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5714
5715         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5716                                  (void **) &req, &total_len);
5717         if (rc)
5718                 return rc;
5719
5720         if (smb3_encryption_required(tcon))
5721                 flags |= CIFS_TRANSFORM_REQ;
5722
5723         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5724         req->LockCount = cpu_to_le16(num_lock);
5725
5726         req->PersistentFileId = persist_fid;
5727         req->VolatileFileId = volatile_fid;
5728
5729         count = num_lock * sizeof(struct smb2_lock_element);
5730
5731         iov[0].iov_base = (char *)req;
5732         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5733         iov[1].iov_base = (char *)buf;
5734         iov[1].iov_len = count;
5735
5736         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5737
5738         memset(&rqst, 0, sizeof(struct smb_rqst));
5739         rqst.rq_iov = iov;
5740         rqst.rq_nvec = 2;
5741
5742         rc = cifs_send_recv(xid, tcon->ses, server,
5743                             &rqst, &resp_buf_type, flags,
5744                             &rsp_iov);
5745         cifs_small_buf_release(req);
5746         if (rc) {
5747                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5748                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5749                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5750                                     tcon->ses->Suid, rc);
5751         }
5752
5753         return rc;
5754 }
5755
5756 int
5757 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5758           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5759           const __u64 length, const __u64 offset, const __u32 lock_flags,
5760           const bool wait)
5761 {
5762         struct smb2_lock_element lock;
5763
5764         lock.Offset = cpu_to_le64(offset);
5765         lock.Length = cpu_to_le64(length);
5766         lock.Flags = cpu_to_le32(lock_flags);
5767         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5768                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5769
5770         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5771 }
5772
5773 int
5774 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5775                  __u8 *lease_key, const __le32 lease_state)
5776 {
5777         struct smb_rqst rqst;
5778         int rc;
5779         struct smb2_lease_ack *req = NULL;
5780         struct cifs_ses *ses = tcon->ses;
5781         int flags = CIFS_OBREAK_OP;
5782         unsigned int total_len;
5783         struct kvec iov[1];
5784         struct kvec rsp_iov;
5785         int resp_buf_type;
5786         __u64 *please_key_high;
5787         __u64 *please_key_low;
5788         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5789
5790         cifs_dbg(FYI, "SMB2_lease_break\n");
5791         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5792                                  (void **) &req, &total_len);
5793         if (rc)
5794                 return rc;
5795
5796         if (smb3_encryption_required(tcon))
5797                 flags |= CIFS_TRANSFORM_REQ;
5798
5799         req->hdr.CreditRequest = cpu_to_le16(1);
5800         req->StructureSize = cpu_to_le16(36);
5801         total_len += 12;
5802
5803         memcpy(req->LeaseKey, lease_key, 16);
5804         req->LeaseState = lease_state;
5805
5806         flags |= CIFS_NO_RSP_BUF;
5807
5808         iov[0].iov_base = (char *)req;
5809         iov[0].iov_len = total_len;
5810
5811         memset(&rqst, 0, sizeof(struct smb_rqst));
5812         rqst.rq_iov = iov;
5813         rqst.rq_nvec = 1;
5814
5815         rc = cifs_send_recv(xid, ses, server,
5816                             &rqst, &resp_buf_type, flags, &rsp_iov);
5817         cifs_small_buf_release(req);
5818
5819         please_key_low = (__u64 *)lease_key;
5820         please_key_high = (__u64 *)(lease_key+8);
5821         if (rc) {
5822                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5823                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5824                         ses->Suid, *please_key_low, *please_key_high, rc);
5825                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5826         } else
5827                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5828                         ses->Suid, *please_key_low, *please_key_high);
5829
5830         return rc;
5831 }