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