fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French ([email protected])
   7  *              Pavel Shilovsky ([email protected]) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon)
 102 {
 103         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 104         shdr->StructureSize = cpu_to_le16(64);
 105         shdr->Command = smb2_cmd;
 106         if (tcon && tcon->ses && tcon->ses->server) {
 107                 struct TCP_Server_Info *server = tcon->ses->server;
 108
 109                 spin_lock(&server->req_lock);
 110                 /* Request up to 10 credits but don't go over the limit. */
 111                 if (server->credits >= server->max_credits)
 112                         shdr->CreditRequest = cpu_to_le16(0);
 113                 else
 114                         shdr->CreditRequest = cpu_to_le16(
 115                                 min_t(int, server->max_credits -
 116                                                 server->credits, 10));
 117                 spin_unlock(&server->req_lock);
 118         } else {
 119                 shdr->CreditRequest = cpu_to_le16(2);
 120         }
 121         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 122
 123         if (!tcon)
 124                 goto out;
 125
 126         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 127         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 128         if ((tcon->ses) && (tcon->ses->server) &&
 129             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 130                 shdr->CreditCharge = cpu_to_le16(1);
 131         /* else CreditCharge MBZ */
 132
 133         shdr->TreeId = tcon->tid;
 134         /* Uid is not converted */
 135         if (tcon->ses)
 136                 shdr->SessionId = tcon->ses->Suid;
 137
 138         /*
 139          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 140          * to pass the path on the Open SMB prefixed by \\server\share.
 141          * Not sure when we would need to do the augmented path (if ever) and
 142          * setting this flag breaks the SMB2 open operation since it is
 143          * illegal to send an empty path name (without \\server\share prefix)
 144          * when the DFS flag is set in the SMB open header. We could
 145          * consider setting the flag on all operations other than open
 146          * but it is safer to net set it for now.
 147          */
 148 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 149                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 150
 151         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 152             !smb3_encryption_required(tcon))
 153                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 154 out:
 155         return;
 156 }
 157
 158 #ifdef CONFIG_CIFS_DFS_UPCALL
 159 static int __smb2_reconnect(const struct nls_table *nlsc,
 160                             struct cifs_tcon *tcon)
 161 {
 162         int rc;
 163         struct dfs_cache_tgt_list tl;
 164         struct dfs_cache_tgt_iterator *it = NULL;
 165         char *tree;
 166         const char *tcp_host;
 167         size_t tcp_host_len;
 168         const char *dfs_host;
 169         size_t dfs_host_len;
 170
 171         tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
 172         if (!tree)
 173                 return -ENOMEM;
 174
 175         if (tcon->ipc) {
 176                 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
 177                           tcon->ses->server->hostname);
 178                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 179                 goto out;
 180         }
 181
 182         if (!tcon->dfs_path) {
 183                 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 184                 goto out;
 185         }
 186
 187         rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
 188         if (rc)
 189                 goto out;
 190
 191         extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
 192                              &tcp_host_len);
 193
 194         for (it = dfs_cache_get_tgt_iterator(&tl); it;
 195              it = dfs_cache_get_next_tgt(&tl, it)) {
 196                 const char *tgt = dfs_cache_get_tgt_name(it);
 197
 198                 extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);
 199
 200                 if (dfs_host_len != tcp_host_len
 201                     || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
 202                         cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
 203                                  __func__,
 204                                  (int)dfs_host_len, dfs_host,
 205                                  (int)tcp_host_len, tcp_host);
 206                         continue;
 207                 }
 208
 209                 scnprintf(tree, MAX_TREE_SIZE, "\\%s", tgt);
 210
 211                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 212                 if (!rc)
 213                         break;
 214                 if (rc == -EREMOTE)
 215                         break;
 216         }
 217
 218         if (!rc) {
 219                 if (it)
 220                         rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
 221                                                             it);
 222                 else
 223                         rc = -ENOENT;
 224         }
 225         dfs_cache_free_tgts(&tl);
 226 out:
 227         kfree(tree);
 228         return rc;
 229 }
 230 #else
 231 static inline int __smb2_reconnect(const struct nls_table *nlsc,
 232                                    struct cifs_tcon *tcon)
 233 {
 234         return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 235 }
 236 #endif
 237
 238 static int
 239 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 240 {
 241         int rc;
 242         struct nls_table *nls_codepage;
 243         struct cifs_ses *ses;
 244         struct TCP_Server_Info *server;
 245         int retries;
 246
 247         /*
 248          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 249          * check for tcp and smb session status done differently
 250          * for those three - in the calling routine.
 251          */
 252         if (tcon == NULL)
 253                 return 0;
 254
 255         if (smb2_command == SMB2_TREE_CONNECT)
 256                 return 0;
 257
 258         if (tcon->tidStatus == CifsExiting) {
 259                 /*
 260                  * only tree disconnect, open, and write,
 261                  * (and ulogoff which does not have tcon)
 262                  * are allowed as we start force umount.
 263                  */
 264                 if ((smb2_command != SMB2_WRITE) &&
 265                    (smb2_command != SMB2_CREATE) &&
 266                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 267                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 268                                  smb2_command);
 269                         return -ENODEV;
 270                 }
 271         }
 272         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 273             (!tcon->ses->server))
 274                 return -EIO;
 275
 276         ses = tcon->ses;
 277         server = ses->server;
 278
 279         retries = server->nr_targets;
 280
 281         /*
 282          * Give demultiplex thread up to 10 seconds to each target available for
 283          * reconnect -- should be greater than cifs socket timeout which is 7
 284          * seconds.
 285          */
 286         while (server->tcpStatus == CifsNeedReconnect) {
 287                 /*
 288                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 289                  * here since they are implicitly done when session drops.
 290                  */
 291                 switch (smb2_command) {
 292                 /*
 293                  * BB Should we keep oplock break and add flush to exceptions?
 294                  */
 295                 case SMB2_TREE_DISCONNECT:
 296                 case SMB2_CANCEL:
 297                 case SMB2_CLOSE:
 298                 case SMB2_OPLOCK_BREAK:
 299                         return -EAGAIN;
 300                 }
 301
 302                 rc = wait_event_interruptible_timeout(server->response_q,
 303                                                       (server->tcpStatus != CifsNeedReconnect),
 304                                                       10 * HZ);
 305                 if (rc < 0) {
 306                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 307                                  " signal by the process\n", __func__);
 308                         return -ERESTARTSYS;
 309                 }
 310
 311                 /* are we still trying to reconnect? */
 312                 if (server->tcpStatus != CifsNeedReconnect)
 313                         break;
 314
 315                 if (--retries)
 316                         continue;
 317
 318                 /*
 319                  * on "soft" mounts we wait once. Hard mounts keep
 320                  * retrying until process is killed or server comes
 321                  * back on-line
 322                  */
 323                 if (!tcon->retry) {
 324                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 325                         return -EHOSTDOWN;
 326                 }
 327                 retries = server->nr_targets;
 328         }
 329
 330         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 331                 return 0;
 332
 333         nls_codepage = load_nls_default();
 334
 335         /*
 336          * need to prevent multiple threads trying to simultaneously reconnect
 337          * the same SMB session
 338          */
 339         mutex_lock(&tcon->ses->session_mutex);
 340
 341         /*
 342          * Recheck after acquire mutex. If another thread is negotiating
 343          * and the server never sends an answer the socket will be closed
 344          * and tcpStatus set to reconnect.
 345          */
 346         if (server->tcpStatus == CifsNeedReconnect) {
 347                 rc = -EHOSTDOWN;
 348                 mutex_unlock(&tcon->ses->session_mutex);
 349                 goto out;
 350         }
 351
 352         rc = cifs_negotiate_protocol(0, tcon->ses);
 353         if (!rc && tcon->ses->need_reconnect)
 354                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 355
 356         if (rc || !tcon->need_reconnect) {
 357                 mutex_unlock(&tcon->ses->session_mutex);
 358                 goto out;
 359         }
 360
 361         cifs_mark_open_files_invalid(tcon);
 362         if (tcon->use_persistent)
 363                 tcon->need_reopen_files = true;
 364
 365         rc = __smb2_reconnect(nls_codepage, tcon);
 366         mutex_unlock(&tcon->ses->session_mutex);
 367
 368         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 369         if (rc) {
 370                 /* If sess reconnected but tcon didn't, something strange ... */
 371                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 372                 goto out;
 373         }
 374
 375         if (smb2_command != SMB2_INTERNAL_CMD)
 376                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 377
 378         atomic_inc(&tconInfoReconnectCount);
 379 out:
 380         /*
 381          * Check if handle based operation so we know whether we can continue
 382          * or not without returning to caller to reset file handle.
 383          */
 384         /*
 385          * BB Is flush done by server on drop of tcp session? Should we special
 386          * case it and skip above?
 387          */
 388         switch (smb2_command) {
 389         case SMB2_FLUSH:
 390         case SMB2_READ:
 391         case SMB2_WRITE:
 392         case SMB2_LOCK:
 393         case SMB2_IOCTL:
 394         case SMB2_QUERY_DIRECTORY:
 395         case SMB2_CHANGE_NOTIFY:
 396         case SMB2_QUERY_INFO:
 397         case SMB2_SET_INFO:
 398                 rc = -EAGAIN;
 399         }
 400         unload_nls(nls_codepage);
 401         return rc;
 402 }
 403
 404 static void
 405 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 406                unsigned int *total_len)
 407 {
 408         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 409         /* lookup word count ie StructureSize from table */
 410         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 411
 412         /*
 413          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 414          * largest operations (Create)
 415          */
 416         memset(buf, 0, 256);
 417
 418         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 419         spdu->StructureSize2 = cpu_to_le16(parmsize);
 420
 421         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 422 }
 423
 424 /*
 425  * Allocate and return pointer to an SMB request hdr, and set basic
 426  * SMB information in the SMB header. If the return code is zero, this
 427  * function must have filled in request_buf pointer.
 428  */
 429 static int
 430 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 431                     void **request_buf, unsigned int *total_len)
 432 {
 433         int rc;
 434
 435         rc = smb2_reconnect(smb2_command, tcon);
 436         if (rc)
 437                 return rc;
 438
 439         /* BB eventually switch this to SMB2 specific small buf size */
 440         if (smb2_command == SMB2_SET_INFO)
 441                 *request_buf = cifs_buf_get();
 442         else
 443                 *request_buf = cifs_small_buf_get();
 444         if (*request_buf == NULL) {
 445                 /* BB should we add a retry in here if not a writepage? */
 446                 return -ENOMEM;
 447         }
 448
 449         fill_small_buf(smb2_command, tcon,
 450                        (struct smb2_sync_hdr *)(*request_buf),
 451                        total_len);
 452
 453         if (tcon != NULL) {
 454                 uint16_t com_code = le16_to_cpu(smb2_command);
 455                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 456                 cifs_stats_inc(&tcon->num_smbs_sent);
 457         }
 458
 459         return rc;
 460 }
 461
 462 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 463
 464 static void
 465 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 466 {
 467         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 468         pneg_ctxt->DataLength = cpu_to_le16(38);
 469         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 470         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 471         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 472         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 473 }
 474
 475 static void
 476 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 477 {
 478         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 479         pneg_ctxt->DataLength =
 480                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 481                           - sizeof(struct smb2_neg_context));
 482         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 483         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 484         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 485         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 486 }
 487
 488 static void
 489 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 490 {
 491         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 492         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 493         pneg_ctxt->CipherCount = cpu_to_le16(1);
 494 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 495         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 496 }
 497
 498 static void
 499 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 500 {
 501         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 502         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 503         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 504         pneg_ctxt->Name[0] = 0x93;
 505         pneg_ctxt->Name[1] = 0xAD;
 506         pneg_ctxt->Name[2] = 0x25;
 507         pneg_ctxt->Name[3] = 0x50;
 508         pneg_ctxt->Name[4] = 0x9C;
 509         pneg_ctxt->Name[5] = 0xB4;
 510         pneg_ctxt->Name[6] = 0x11;
 511         pneg_ctxt->Name[7] = 0xE7;
 512         pneg_ctxt->Name[8] = 0xB4;
 513         pneg_ctxt->Name[9] = 0x23;
 514         pneg_ctxt->Name[10] = 0x83;
 515         pneg_ctxt->Name[11] = 0xDE;
 516         pneg_ctxt->Name[12] = 0x96;
 517         pneg_ctxt->Name[13] = 0x8B;
 518         pneg_ctxt->Name[14] = 0xCD;
 519         pneg_ctxt->Name[15] = 0x7C;
 520 }
 521
 522 static void
 523 assemble_neg_contexts(struct smb2_negotiate_req *req,
 524                       unsigned int *total_len)
 525 {
 526         char *pneg_ctxt = (char *)req;
 527         unsigned int ctxt_len;
 528
 529         if (*total_len > 200) {
 530                 /* In case length corrupted don't want to overrun smb buffer */
 531                 cifs_dbg(VFS, "Bad frame length assembling neg contexts\n");
 532                 return;
 533         }
 534
 535         /*
 536          * round up total_len of fixed part of SMB3 negotiate request to 8
 537          * byte boundary before adding negotiate contexts
 538          */
 539         *total_len = roundup(*total_len, 8);
 540
 541         pneg_ctxt = (*total_len) + (char *)req;
 542         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 543
 544         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 545         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 546         *total_len += ctxt_len;
 547         pneg_ctxt += ctxt_len;
 548
 549         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 550         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 551         *total_len += ctxt_len;
 552         pneg_ctxt += ctxt_len;
 553
 554         build_compression_ctxt((struct smb2_compression_capabilities_context *)
 555                                 pneg_ctxt);
 556         ctxt_len = DIV_ROUND_UP(
 557                 sizeof(struct smb2_compression_capabilities_context), 8) * 8;
 558         *total_len += ctxt_len;
 559         pneg_ctxt += ctxt_len;
 560
 561         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 562         *total_len += sizeof(struct smb2_posix_neg_context);
 563
 564         req->NegotiateContextCount = cpu_to_le16(4);
 565 }
 566
 567 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 568 {
 569         unsigned int len = le16_to_cpu(ctxt->DataLength);
 570
 571         /* If invalid preauth context warn but use what we requested, SHA-512 */
 572         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 573                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 574                 return;
 575         }
 576         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 577                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 578         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 579                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 580 }
 581
 582 static void decode_compress_ctx(struct TCP_Server_Info *server,
 583                          struct smb2_compression_capabilities_context *ctxt)
 584 {
 585         unsigned int len = le16_to_cpu(ctxt->DataLength);
 586
 587         /* sizeof compress context is a one element compression capbility struct */
 588         if (len < 10) {
 589                 printk_once(KERN_WARNING "server sent bad compression cntxt\n");
 590                 return;
 591         }
 592         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 593                 printk_once(KERN_WARNING "illegal SMB3 compress algorithm count\n");
 594                 return;
 595         }
 596         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 597                 printk_once(KERN_WARNING "unknown compression algorithm\n");
 598                 return;
 599         }
 600         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 601 }
 602
 603 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 604                               struct smb2_encryption_neg_context *ctxt)
 605 {
 606         unsigned int len = le16_to_cpu(ctxt->DataLength);
 607
 608         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 609         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 610                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 611                 return -EINVAL;
 612         }
 613
 614         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 615                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 616                 return -EINVAL;
 617         }
 618         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 619         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 620             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 621                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 622                 return -EINVAL;
 623         }
 624         server->cipher_type = ctxt->Ciphers[0];
 625         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 626         return 0;
 627 }
 628
 629 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 630                                      struct TCP_Server_Info *server,
 631                                      unsigned int len_of_smb)
 632 {
 633         struct smb2_neg_context *pctx;
 634         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 635         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 636         unsigned int len_of_ctxts, i;
 637         int rc = 0;
 638
 639         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 640         if (len_of_smb <= offset) {
 641                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 642                 return -EINVAL;
 643         }
 644
 645         len_of_ctxts = len_of_smb - offset;
 646
 647         for (i = 0; i < ctxt_cnt; i++) {
 648                 int clen;
 649                 /* check that offset is not beyond end of SMB */
 650                 if (len_of_ctxts == 0)
 651                         break;
 652
 653                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 654                         break;
 655
 656                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 657                 clen = le16_to_cpu(pctx->DataLength);
 658                 if (clen > len_of_ctxts)
 659                         break;
 660
 661                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 662                         decode_preauth_context(
 663                                 (struct smb2_preauth_neg_context *)pctx);
 664                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 665                         rc = decode_encrypt_ctx(server,
 666                                 (struct smb2_encryption_neg_context *)pctx);
 667                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 668                         decode_compress_ctx(server,
 669                                 (struct smb2_compression_capabilities_context *)pctx);
 670                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 671                         server->posix_ext_supported = true;
 672                 else
 673                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 674                                 le16_to_cpu(pctx->ContextType));
 675
 676                 if (rc)
 677                         break;
 678                 /* offsets must be 8 byte aligned */
 679                 clen = (clen + 7) & ~0x7;
 680                 offset += clen + sizeof(struct smb2_neg_context);
 681                 len_of_ctxts -= clen;
 682         }
 683         return rc;
 684 }
 685
 686 static struct create_posix *
 687 create_posix_buf(umode_t mode)
 688 {
 689         struct create_posix *buf;
 690
 691         buf = kzalloc(sizeof(struct create_posix),
 692                         GFP_KERNEL);
 693         if (!buf)
 694                 return NULL;
 695
 696         buf->ccontext.DataOffset =
 697                 cpu_to_le16(offsetof(struct create_posix, Mode));
 698         buf->ccontext.DataLength = cpu_to_le32(4);
 699         buf->ccontext.NameOffset =
 700                 cpu_to_le16(offsetof(struct create_posix, Name));
 701         buf->ccontext.NameLength = cpu_to_le16(16);
 702
 703         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 704         buf->Name[0] = 0x93;
 705         buf->Name[1] = 0xAD;
 706         buf->Name[2] = 0x25;
 707         buf->Name[3] = 0x50;
 708         buf->Name[4] = 0x9C;
 709         buf->Name[5] = 0xB4;
 710         buf->Name[6] = 0x11;
 711         buf->Name[7] = 0xE7;
 712         buf->Name[8] = 0xB4;
 713         buf->Name[9] = 0x23;
 714         buf->Name[10] = 0x83;
 715         buf->Name[11] = 0xDE;
 716         buf->Name[12] = 0x96;
 717         buf->Name[13] = 0x8B;
 718         buf->Name[14] = 0xCD;
 719         buf->Name[15] = 0x7C;
 720         buf->Mode = cpu_to_le32(mode);
 721         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 722         return buf;
 723 }
 724
 725 static int
 726 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 727 {
 728         struct smb2_create_req *req = iov[0].iov_base;
 729         unsigned int num = *num_iovec;
 730
 731         iov[num].iov_base = create_posix_buf(mode);
 732         if (iov[num].iov_base == NULL)
 733                 return -ENOMEM;
 734         iov[num].iov_len = sizeof(struct create_posix);
 735         if (!req->CreateContextsOffset)
 736                 req->CreateContextsOffset = cpu_to_le32(
 737                                 sizeof(struct smb2_create_req) +
 738                                 iov[num - 1].iov_len);
 739         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 740         *num_iovec = num + 1;
 741         return 0;
 742 }
 743
 744
 745 /*
 746  *
 747  *      SMB2 Worker functions follow:
 748  *
 749  *      The general structure of the worker functions is:
 750  *      1) Call smb2_init (assembles SMB2 header)
 751  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 752  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 753  *      4) Decode SMB2 command specific fields in the fixed length area
 754  *      5) Decode variable length data area (if any for this SMB2 command type)
 755  *      6) Call free smb buffer
 756  *      7) return
 757  *
 758  */
 759
 760 int
 761 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 762 {
 763         struct smb_rqst rqst;
 764         struct smb2_negotiate_req *req;
 765         struct smb2_negotiate_rsp *rsp;
 766         struct kvec iov[1];
 767         struct kvec rsp_iov;
 768         int rc = 0;
 769         int resp_buftype;
 770         struct TCP_Server_Info *server = ses->server;
 771         int blob_offset, blob_length;
 772         char *security_blob;
 773         int flags = CIFS_NEG_OP;
 774         unsigned int total_len;
 775
 776         cifs_dbg(FYI, "Negotiate protocol\n");
 777
 778         if (!server) {
 779                 WARN(1, "%s: server is NULL!\n", __func__);
 780                 return -EIO;
 781         }
 782
 783         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 784         if (rc)
 785                 return rc;
 786
 787         req->sync_hdr.SessionId = 0;
 788
 789         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 790         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 791
 792         if (strcmp(ses->server->vals->version_string,
 793                    SMB3ANY_VERSION_STRING) == 0) {
 794                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 795                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 796                 req->DialectCount = cpu_to_le16(2);
 797                 total_len += 4;
 798         } else if (strcmp(ses->server->vals->version_string,
 799                    SMBDEFAULT_VERSION_STRING) == 0) {
 800                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 801                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 802                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 803                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 804                 req->DialectCount = cpu_to_le16(4);
 805                 total_len += 8;
 806         } else {
 807                 /* otherwise send specific dialect */
 808                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 809                 req->DialectCount = cpu_to_le16(1);
 810                 total_len += 2;
 811         }
 812
 813         /* only one of SMB2 signing flags may be set in SMB2 request */
 814         if (ses->sign)
 815                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 816         else if (global_secflags & CIFSSEC_MAY_SIGN)
 817                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 818         else
 819                 req->SecurityMode = 0;
 820
 821         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 822
 823         /* ClientGUID must be zero for SMB2.02 dialect */
 824         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 825                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 826         else {
 827                 memcpy(req->ClientGUID, server->client_guid,
 828                         SMB2_CLIENT_GUID_SIZE);
 829                 if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
 830                     (strcmp(ses->server->vals->version_string,
 831                      SMBDEFAULT_VERSION_STRING) == 0))
 832                         assemble_neg_contexts(req, &total_len);
 833         }
 834         iov[0].iov_base = (char *)req;
 835         iov[0].iov_len = total_len;
 836
 837         memset(&rqst, 0, sizeof(struct smb_rqst));
 838         rqst.rq_iov = iov;
 839         rqst.rq_nvec = 1;
 840
 841         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 842         cifs_small_buf_release(req);
 843         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 844         /*
 845          * No tcon so can't do
 846          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 847          */
 848         if (rc == -EOPNOTSUPP) {
 849                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 850                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 851                         " older servers\n");
 852                 goto neg_exit;
 853         } else if (rc != 0)
 854                 goto neg_exit;
 855
 856         if (strcmp(ses->server->vals->version_string,
 857                    SMB3ANY_VERSION_STRING) == 0) {
 858                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 859                         cifs_dbg(VFS,
 860                                 "SMB2 dialect returned but not requested\n");
 861                         return -EIO;
 862                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 863                         cifs_dbg(VFS,
 864                                 "SMB2.1 dialect returned but not requested\n");
 865                         return -EIO;
 866                 }
 867         } else if (strcmp(ses->server->vals->version_string,
 868                    SMBDEFAULT_VERSION_STRING) == 0) {
 869                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 870                         cifs_dbg(VFS,
 871                                 "SMB2 dialect returned but not requested\n");
 872                         return -EIO;
 873                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 874                         /* ops set to 3.0 by default for default so update */
 875                         ses->server->ops = &smb21_operations;
 876                         ses->server->vals = &smb21_values;
 877                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 878                         ses->server->ops = &smb311_operations;
 879                         ses->server->vals = &smb311_values;
 880                 }
 881         } else if (le16_to_cpu(rsp->DialectRevision) !=
 882                                 ses->server->vals->protocol_id) {
 883                 /* if requested single dialect ensure returned dialect matched */
 884                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 885                         le16_to_cpu(rsp->DialectRevision));
 886                 return -EIO;
 887         }
 888
 889         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 890
 891         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 892                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 893         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 894                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 895         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 896                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 897         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 898                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 899         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 900                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 901         else {
 902                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 903                          le16_to_cpu(rsp->DialectRevision));
 904                 rc = -EIO;
 905                 goto neg_exit;
 906         }
 907         server->dialect = le16_to_cpu(rsp->DialectRevision);
 908
 909         /*
 910          * Keep a copy of the hash after negprot. This hash will be
 911          * the starting hash value for all sessions made from this
 912          * server.
 913          */
 914         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 915                SMB2_PREAUTH_HASH_SIZE);
 916
 917         /* SMB2 only has an extended negflavor */
 918         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 919         /* set it to the maximum buffer size value we can send with 1 credit */
 920         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 921                                SMB2_MAX_BUFFER_SIZE);
 922         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 923         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 924         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 925         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 926                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 927                                 server->sec_mode);
 928         server->capabilities = le32_to_cpu(rsp->Capabilities);
 929         /* Internal types */
 930         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 931
 932         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 933                                                (struct smb2_sync_hdr *)rsp);
 934         /*
 935          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 936          * for us will be
 937          *      ses->sectype = RawNTLMSSP;
 938          * but for time being this is our only auth choice so doesn't matter.
 939          * We just found a server which sets blob length to zero expecting raw.
 940          */
 941         if (blob_length == 0) {
 942                 cifs_dbg(FYI, "missing security blob on negprot\n");
 943                 server->sec_ntlmssp = true;
 944         }
 945
 946         rc = cifs_enable_signing(server, ses->sign);
 947         if (rc)
 948                 goto neg_exit;
 949         if (blob_length) {
 950                 rc = decode_negTokenInit(security_blob, blob_length, server);
 951                 if (rc == 1)
 952                         rc = 0;
 953                 else if (rc == 0)
 954                         rc = -EIO;
 955         }
 956
 957         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 958                 if (rsp->NegotiateContextCount)
 959                         rc = smb311_decode_neg_context(rsp, server,
 960                                                        rsp_iov.iov_len);
 961                 else
 962                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 963         }
 964 neg_exit:
 965         free_rsp_buf(resp_buftype, rsp);
 966         return rc;
 967 }
 968
 969 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 970 {
 971         int rc;
 972         struct validate_negotiate_info_req *pneg_inbuf;
 973         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 974         u32 rsplen;
 975         u32 inbuflen; /* max of 4 dialects */
 976
 977         cifs_dbg(FYI, "validate negotiate\n");
 978
 979         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 980         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 981                 return 0;
 982
 983         /*
 984          * validation ioctl must be signed, so no point sending this if we
 985          * can not sign it (ie are not known user).  Even if signing is not
 986          * required (enabled but not negotiated), in those cases we selectively
 987          * sign just this, the first and only signed request on a connection.
 988          * Having validation of negotiate info  helps reduce attack vectors.
 989          */
 990         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 991                 return 0; /* validation requires signing */
 992
 993         if (tcon->ses->user_name == NULL) {
 994                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 995                 return 0; /* validation requires signing */
 996         }
 997
 998         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 999                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1000
1001         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1002         if (!pneg_inbuf)
1003                 return -ENOMEM;
1004
1005         pneg_inbuf->Capabilities =
1006                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
1007         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
1008                                         SMB2_CLIENT_GUID_SIZE);
1009
1010         if (tcon->ses->sign)
1011                 pneg_inbuf->SecurityMode =
1012                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1013         else if (global_secflags & CIFSSEC_MAY_SIGN)
1014                 pneg_inbuf->SecurityMode =
1015                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1016         else
1017                 pneg_inbuf->SecurityMode = 0;
1018
1019
1020         if (strcmp(tcon->ses->server->vals->version_string,
1021                 SMB3ANY_VERSION_STRING) == 0) {
1022                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1023                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1024                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1025                 /* structure is big enough for 3 dialects, sending only 2 */
1026                 inbuflen = sizeof(*pneg_inbuf) -
1027                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1028         } else if (strcmp(tcon->ses->server->vals->version_string,
1029                 SMBDEFAULT_VERSION_STRING) == 0) {
1030                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1031                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1032                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1033                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1034                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1035                 /* structure is big enough for 3 dialects */
1036                 inbuflen = sizeof(*pneg_inbuf);
1037         } else {
1038                 /* otherwise specific dialect was requested */
1039                 pneg_inbuf->Dialects[0] =
1040                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
1041                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1042                 /* structure is big enough for 3 dialects, sending only 1 */
1043                 inbuflen = sizeof(*pneg_inbuf) -
1044                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1045         }
1046
1047         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1048                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1049                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1050                 (char **)&pneg_rsp, &rsplen);
1051         if (rc == -EOPNOTSUPP) {
1052                 /*
1053                  * Old Windows versions or Netapp SMB server can return
1054                  * not supported error. Client should accept it.
1055                  */
1056                 cifs_dbg(VFS, "Server does not support validate negotiate\n");
1057                 rc = 0;
1058                 goto out_free_inbuf;
1059         } else if (rc != 0) {
1060                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1061                 rc = -EIO;
1062                 goto out_free_inbuf;
1063         }
1064
1065         rc = -EIO;
1066         if (rsplen != sizeof(*pneg_rsp)) {
1067                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1068                          rsplen);
1069
1070                 /* relax check since Mac returns max bufsize allowed on ioctl */
1071                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1072                         goto out_free_rsp;
1073         }
1074
1075         /* check validate negotiate info response matches what we got earlier */
1076         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
1077                 goto vneg_out;
1078
1079         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
1080                 goto vneg_out;
1081
1082         /* do not validate server guid because not saved at negprot time yet */
1083
1084         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1085               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
1086                 goto vneg_out;
1087
1088         /* validate negotiate successful */
1089         rc = 0;
1090         cifs_dbg(FYI, "validate negotiate info successful\n");
1091         goto out_free_rsp;
1092
1093 vneg_out:
1094         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1095 out_free_rsp:
1096         kfree(pneg_rsp);
1097 out_free_inbuf:
1098         kfree(pneg_inbuf);
1099         return rc;
1100 }
1101
1102 enum securityEnum
1103 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1104 {
1105         switch (requested) {
1106         case Kerberos:
1107         case RawNTLMSSP:
1108                 return requested;
1109         case NTLMv2:
1110                 return RawNTLMSSP;
1111         case Unspecified:
1112                 if (server->sec_ntlmssp &&
1113                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1114                         return RawNTLMSSP;
1115                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1116                         (global_secflags & CIFSSEC_MAY_KRB5))
1117                         return Kerberos;
1118                 /* Fallthrough */
1119         default:
1120                 return Unspecified;
1121         }
1122 }
1123
1124 struct SMB2_sess_data {
1125         unsigned int xid;
1126         struct cifs_ses *ses;
1127         struct nls_table *nls_cp;
1128         void (*func)(struct SMB2_sess_data *);
1129         int result;
1130         u64 previous_session;
1131
1132         /* we will send the SMB in three pieces:
1133          * a fixed length beginning part, an optional
1134          * SPNEGO blob (which can be zero length), and a
1135          * last part which will include the strings
1136          * and rest of bcc area. This allows us to avoid
1137          * a large buffer 17K allocation
1138          */
1139         int buf0_type;
1140         struct kvec iov[2];
1141 };
1142
1143 static int
1144 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1145 {
1146         int rc;
1147         struct cifs_ses *ses = sess_data->ses;
1148         struct smb2_sess_setup_req *req;
1149         struct TCP_Server_Info *server = ses->server;
1150         unsigned int total_len;
1151
1152         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1153                              &total_len);
1154         if (rc)
1155                 return rc;
1156
1157         /* First session, not a reauthenticate */
1158         req->sync_hdr.SessionId = 0;
1159
1160         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1161         req->PreviousSessionId = sess_data->previous_session;
1162
1163         req->Flags = 0; /* MBZ */
1164
1165         /* enough to enable echos and oplocks and one max size write */
1166         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1167
1168         /* only one of SMB2 signing flags may be set in SMB2 request */
1169         if (server->sign)
1170                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1171         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1172                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1173         else
1174                 req->SecurityMode = 0;
1175
1176         req->Capabilities = 0;
1177         req->Channel = 0; /* MBZ */
1178
1179         sess_data->iov[0].iov_base = (char *)req;
1180         /* 1 for pad */
1181         sess_data->iov[0].iov_len = total_len - 1;
1182         /*
1183          * This variable will be used to clear the buffer
1184          * allocated above in case of any error in the calling function.
1185          */
1186         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1187
1188         return 0;
1189 }
1190
1191 static void
1192 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1193 {
1194         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1195         sess_data->buf0_type = CIFS_NO_BUFFER;
1196 }
1197
1198 static int
1199 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1200 {
1201         int rc;
1202         struct smb_rqst rqst;
1203         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1204         struct kvec rsp_iov = { NULL, 0 };
1205
1206         /* Testing shows that buffer offset must be at location of Buffer[0] */
1207         req->SecurityBufferOffset =
1208                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1209         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1210
1211         memset(&rqst, 0, sizeof(struct smb_rqst));
1212         rqst.rq_iov = sess_data->iov;
1213         rqst.rq_nvec = 2;
1214
1215         /* BB add code to build os and lm fields */
1216         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1217                             &rqst,
1218                             &sess_data->buf0_type,
1219                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1220         cifs_small_buf_release(sess_data->iov[0].iov_base);
1221         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1222
1223         return rc;
1224 }
1225
1226 static int
1227 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1228 {
1229         int rc = 0;
1230         struct cifs_ses *ses = sess_data->ses;
1231
1232         mutex_lock(&ses->server->srv_mutex);
1233         if (ses->server->ops->generate_signingkey) {
1234                 rc = ses->server->ops->generate_signingkey(ses);
1235                 if (rc) {
1236                         cifs_dbg(FYI,
1237                                 "SMB3 session key generation failed\n");
1238                         mutex_unlock(&ses->server->srv_mutex);
1239                         return rc;
1240                 }
1241         }
1242         if (!ses->server->session_estab) {
1243                 ses->server->sequence_number = 0x2;
1244                 ses->server->session_estab = true;
1245         }
1246         mutex_unlock(&ses->server->srv_mutex);
1247
1248         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1249         spin_lock(&GlobalMid_Lock);
1250         ses->status = CifsGood;
1251         ses->need_reconnect = false;
1252         spin_unlock(&GlobalMid_Lock);
1253         return rc;
1254 }
1255
1256 #ifdef CONFIG_CIFS_UPCALL
1257 static void
1258 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1259 {
1260         int rc;
1261         struct cifs_ses *ses = sess_data->ses;
1262         struct cifs_spnego_msg *msg;
1263         struct key *spnego_key = NULL;
1264         struct smb2_sess_setup_rsp *rsp = NULL;
1265
1266         rc = SMB2_sess_alloc_buffer(sess_data);
1267         if (rc)
1268                 goto out;
1269
1270         spnego_key = cifs_get_spnego_key(ses);
1271         if (IS_ERR(spnego_key)) {
1272                 rc = PTR_ERR(spnego_key);
1273                 spnego_key = NULL;
1274                 goto out;
1275         }
1276
1277         msg = spnego_key->payload.data[0];
1278         /*
1279          * check version field to make sure that cifs.upcall is
1280          * sending us a response in an expected form
1281          */
1282         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1283                 cifs_dbg(VFS,
1284                           "bad cifs.upcall version. Expected %d got %d",
1285                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1286                 rc = -EKEYREJECTED;
1287                 goto out_put_spnego_key;
1288         }
1289
1290         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1291                                          GFP_KERNEL);
1292         if (!ses->auth_key.response) {
1293                 cifs_dbg(VFS,
1294                         "Kerberos can't allocate (%u bytes) memory",
1295                         msg->sesskey_len);
1296                 rc = -ENOMEM;
1297                 goto out_put_spnego_key;
1298         }
1299         ses->auth_key.len = msg->sesskey_len;
1300
1301         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1302         sess_data->iov[1].iov_len = msg->secblob_len;
1303
1304         rc = SMB2_sess_sendreceive(sess_data);
1305         if (rc)
1306                 goto out_put_spnego_key;
1307
1308         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1309         ses->Suid = rsp->sync_hdr.SessionId;
1310
1311         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1312
1313         rc = SMB2_sess_establish_session(sess_data);
1314 out_put_spnego_key:
1315         key_invalidate(spnego_key);
1316         key_put(spnego_key);
1317 out:
1318         sess_data->result = rc;
1319         sess_data->func = NULL;
1320         SMB2_sess_free_buffer(sess_data);
1321 }
1322 #else
1323 static void
1324 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1325 {
1326         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1327         sess_data->result = -EOPNOTSUPP;
1328         sess_data->func = NULL;
1329 }
1330 #endif
1331
1332 static void
1333 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1334
1335 static void
1336 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1337 {
1338         int rc;
1339         struct cifs_ses *ses = sess_data->ses;
1340         struct smb2_sess_setup_rsp *rsp = NULL;
1341         char *ntlmssp_blob = NULL;
1342         bool use_spnego = false; /* else use raw ntlmssp */
1343         u16 blob_length = 0;
1344
1345         /*
1346          * If memory allocation is successful, caller of this function
1347          * frees it.
1348          */
1349         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1350         if (!ses->ntlmssp) {
1351                 rc = -ENOMEM;
1352                 goto out_err;
1353         }
1354         ses->ntlmssp->sesskey_per_smbsess = true;
1355
1356         rc = SMB2_sess_alloc_buffer(sess_data);
1357         if (rc)
1358                 goto out_err;
1359
1360         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1361                                GFP_KERNEL);
1362         if (ntlmssp_blob == NULL) {
1363                 rc = -ENOMEM;
1364                 goto out;
1365         }
1366
1367         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1368         if (use_spnego) {
1369                 /* BB eventually need to add this */
1370                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1371                 rc = -EOPNOTSUPP;
1372                 goto out;
1373         } else {
1374                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1375                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1376         }
1377         sess_data->iov[1].iov_base = ntlmssp_blob;
1378         sess_data->iov[1].iov_len = blob_length;
1379
1380         rc = SMB2_sess_sendreceive(sess_data);
1381         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1382
1383         /* If true, rc here is expected and not an error */
1384         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1385                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1386                 rc = 0;
1387
1388         if (rc)
1389                 goto out;
1390
1391         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1392                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1393                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1394                         le16_to_cpu(rsp->SecurityBufferOffset));
1395                 rc = -EIO;
1396                 goto out;
1397         }
1398         rc = decode_ntlmssp_challenge(rsp->Buffer,
1399                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1400         if (rc)
1401                 goto out;
1402
1403         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1404
1405
1406         ses->Suid = rsp->sync_hdr.SessionId;
1407         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1408
1409 out:
1410         kfree(ntlmssp_blob);
1411         SMB2_sess_free_buffer(sess_data);
1412         if (!rc) {
1413                 sess_data->result = 0;
1414                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1415                 return;
1416         }
1417 out_err:
1418         kfree(ses->ntlmssp);
1419         ses->ntlmssp = NULL;
1420         sess_data->result = rc;
1421         sess_data->func = NULL;
1422 }
1423
1424 static void
1425 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1426 {
1427         int rc;
1428         struct cifs_ses *ses = sess_data->ses;
1429         struct smb2_sess_setup_req *req;
1430         struct smb2_sess_setup_rsp *rsp = NULL;
1431         unsigned char *ntlmssp_blob = NULL;
1432         bool use_spnego = false; /* else use raw ntlmssp */
1433         u16 blob_length = 0;
1434
1435         rc = SMB2_sess_alloc_buffer(sess_data);
1436         if (rc)
1437                 goto out;
1438
1439         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1440         req->sync_hdr.SessionId = ses->Suid;
1441
1442         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1443                                         sess_data->nls_cp);
1444         if (rc) {
1445                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1446                 goto out;
1447         }
1448
1449         if (use_spnego) {
1450                 /* BB eventually need to add this */
1451                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1452                 rc = -EOPNOTSUPP;
1453                 goto out;
1454         }
1455         sess_data->iov[1].iov_base = ntlmssp_blob;
1456         sess_data->iov[1].iov_len = blob_length;
1457
1458         rc = SMB2_sess_sendreceive(sess_data);
1459         if (rc)
1460                 goto out;
1461
1462         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1463
1464         ses->Suid = rsp->sync_hdr.SessionId;
1465         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1466
1467         rc = SMB2_sess_establish_session(sess_data);
1468 out:
1469         kfree(ntlmssp_blob);
1470         SMB2_sess_free_buffer(sess_data);
1471         kfree(ses->ntlmssp);
1472         ses->ntlmssp = NULL;
1473         sess_data->result = rc;
1474         sess_data->func = NULL;
1475 }
1476
1477 static int
1478 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1479 {
1480         int type;
1481
1482         type = smb2_select_sectype(ses->server, ses->sectype);
1483         cifs_dbg(FYI, "sess setup type %d\n", type);
1484         if (type == Unspecified) {
1485                 cifs_dbg(VFS,
1486                         "Unable to select appropriate authentication method!");
1487                 return -EINVAL;
1488         }
1489
1490         switch (type) {
1491         case Kerberos:
1492                 sess_data->func = SMB2_auth_kerberos;
1493                 break;
1494         case RawNTLMSSP:
1495                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1496                 break;
1497         default:
1498                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1499                 return -EOPNOTSUPP;
1500         }
1501
1502         return 0;
1503 }
1504
1505 int
1506 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1507                 const struct nls_table *nls_cp)
1508 {
1509         int rc = 0;
1510         struct TCP_Server_Info *server = ses->server;
1511         struct SMB2_sess_data *sess_data;
1512
1513         cifs_dbg(FYI, "Session Setup\n");
1514
1515         if (!server) {
1516                 WARN(1, "%s: server is NULL!\n", __func__);
1517                 return -EIO;
1518         }
1519
1520         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1521         if (!sess_data)
1522                 return -ENOMEM;
1523
1524         rc = SMB2_select_sec(ses, sess_data);
1525         if (rc)
1526                 goto out;
1527         sess_data->xid = xid;
1528         sess_data->ses = ses;
1529         sess_data->buf0_type = CIFS_NO_BUFFER;
1530         sess_data->nls_cp = (struct nls_table *) nls_cp;
1531         sess_data->previous_session = ses->Suid;
1532
1533         /*
1534          * Initialize the session hash with the server one.
1535          */
1536         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1537                SMB2_PREAUTH_HASH_SIZE);
1538
1539         while (sess_data->func)
1540                 sess_data->func(sess_data);
1541
1542         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1543                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1544         rc = sess_data->result;
1545 out:
1546         kfree(sess_data);
1547         return rc;
1548 }
1549
1550 int
1551 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1552 {
1553         struct smb_rqst rqst;
1554         struct smb2_logoff_req *req; /* response is also trivial struct */
1555         int rc = 0;
1556         struct TCP_Server_Info *server;
1557         int flags = 0;
1558         unsigned int total_len;
1559         struct kvec iov[1];
1560         struct kvec rsp_iov;
1561         int resp_buf_type;
1562
1563         cifs_dbg(FYI, "disconnect session %p\n", ses);
1564
1565         if (ses && (ses->server))
1566                 server = ses->server;
1567         else
1568                 return -EIO;
1569
1570         /* no need to send SMB logoff if uid already closed due to reconnect */
1571         if (ses->need_reconnect)
1572                 goto smb2_session_already_dead;
1573
1574         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1575         if (rc)
1576                 return rc;
1577
1578          /* since no tcon, smb2_init can not do this, so do here */
1579         req->sync_hdr.SessionId = ses->Suid;
1580
1581         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1582                 flags |= CIFS_TRANSFORM_REQ;
1583         else if (server->sign)
1584                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1585
1586         flags |= CIFS_NO_RSP_BUF;
1587
1588         iov[0].iov_base = (char *)req;
1589         iov[0].iov_len = total_len;
1590
1591         memset(&rqst, 0, sizeof(struct smb_rqst));
1592         rqst.rq_iov = iov;
1593         rqst.rq_nvec = 1;
1594
1595         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1596         cifs_small_buf_release(req);
1597         /*
1598          * No tcon so can't do
1599          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1600          */
1601
1602 smb2_session_already_dead:
1603         return rc;
1604 }
1605
1606 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1607 {
1608         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1609 }
1610
1611 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1612
1613 /* These are similar values to what Windows uses */
1614 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1615 {
1616         tcon->max_chunks = 256;
1617         tcon->max_bytes_chunk = 1048576;
1618         tcon->max_bytes_copy = 16777216;
1619 }
1620
1621 int
1622 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1623           struct cifs_tcon *tcon, const struct nls_table *cp)
1624 {
1625         struct smb_rqst rqst;
1626         struct smb2_tree_connect_req *req;
1627         struct smb2_tree_connect_rsp *rsp = NULL;
1628         struct kvec iov[2];
1629         struct kvec rsp_iov = { NULL, 0 };
1630         int rc = 0;
1631         int resp_buftype;
1632         int unc_path_len;
1633         __le16 *unc_path = NULL;
1634         int flags = 0;
1635         unsigned int total_len;
1636
1637         cifs_dbg(FYI, "TCON\n");
1638
1639         if (!(ses->server) || !tree)
1640                 return -EIO;
1641
1642         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1643         if (unc_path == NULL)
1644                 return -ENOMEM;
1645
1646         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1647         unc_path_len *= 2;
1648         if (unc_path_len < 2) {
1649                 kfree(unc_path);
1650                 return -EINVAL;
1651         }
1652
1653         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1654         tcon->tid = 0;
1655         atomic_set(&tcon->num_remote_opens, 0);
1656         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1657                              &total_len);
1658         if (rc) {
1659                 kfree(unc_path);
1660                 return rc;
1661         }
1662
1663         if (smb3_encryption_required(tcon))
1664                 flags |= CIFS_TRANSFORM_REQ;
1665
1666         iov[0].iov_base = (char *)req;
1667         /* 1 for pad */
1668         iov[0].iov_len = total_len - 1;
1669
1670         /* Testing shows that buffer offset must be at location of Buffer[0] */
1671         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1672                         - 1 /* pad */);
1673         req->PathLength = cpu_to_le16(unc_path_len - 2);
1674         iov[1].iov_base = unc_path;
1675         iov[1].iov_len = unc_path_len;
1676
1677         /*
1678          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1679          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1680          * (Samba servers don't always set the flag so also check if null user)
1681          */
1682         if ((ses->server->dialect == SMB311_PROT_ID) &&
1683             !smb3_encryption_required(tcon) &&
1684             !(ses->session_flags &
1685                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1686             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1687                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1688
1689         memset(&rqst, 0, sizeof(struct smb_rqst));
1690         rqst.rq_iov = iov;
1691         rqst.rq_nvec = 2;
1692
1693         /* Need 64 for max size write so ask for more in case not there yet */
1694         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1695
1696         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1697         cifs_small_buf_release(req);
1698         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1699         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1700         if (rc != 0) {
1701                 if (tcon) {
1702                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1703                         tcon->need_reconnect = true;
1704                 }
1705                 goto tcon_error_exit;
1706         }
1707
1708         switch (rsp->ShareType) {
1709         case SMB2_SHARE_TYPE_DISK:
1710                 cifs_dbg(FYI, "connection to disk share\n");
1711                 break;
1712         case SMB2_SHARE_TYPE_PIPE:
1713                 tcon->pipe = true;
1714                 cifs_dbg(FYI, "connection to pipe share\n");
1715                 break;
1716         case SMB2_SHARE_TYPE_PRINT:
1717                 tcon->print = true;
1718                 cifs_dbg(FYI, "connection to printer\n");
1719                 break;
1720         default:
1721                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1722                 rc = -EOPNOTSUPP;
1723                 goto tcon_error_exit;
1724         }
1725
1726         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1727         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1728         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1729         tcon->tidStatus = CifsGood;
1730         tcon->need_reconnect = false;
1731         tcon->tid = rsp->sync_hdr.TreeId;
1732         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1733
1734         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1735             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1736                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1737
1738         if (tcon->seal &&
1739             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1740                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1741
1742         init_copy_chunk_defaults(tcon);
1743         if (tcon->ses->server->ops->validate_negotiate)
1744                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1745 tcon_exit:
1746
1747         free_rsp_buf(resp_buftype, rsp);
1748         kfree(unc_path);
1749         return rc;
1750
1751 tcon_error_exit:
1752         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1753                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1754         }
1755         goto tcon_exit;
1756 }
1757
1758 int
1759 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1760 {
1761         struct smb_rqst rqst;
1762         struct smb2_tree_disconnect_req *req; /* response is trivial */
1763         int rc = 0;
1764         struct cifs_ses *ses = tcon->ses;
1765         int flags = 0;
1766         unsigned int total_len;
1767         struct kvec iov[1];
1768         struct kvec rsp_iov;
1769         int resp_buf_type;
1770
1771         cifs_dbg(FYI, "Tree Disconnect\n");
1772
1773         if (!ses || !(ses->server))
1774                 return -EIO;
1775
1776         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1777                 return 0;
1778
1779         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1780                              &total_len);
1781         if (rc)
1782                 return rc;
1783
1784         if (smb3_encryption_required(tcon))
1785                 flags |= CIFS_TRANSFORM_REQ;
1786
1787         flags |= CIFS_NO_RSP_BUF;
1788
1789         iov[0].iov_base = (char *)req;
1790         iov[0].iov_len = total_len;
1791
1792         memset(&rqst, 0, sizeof(struct smb_rqst));
1793         rqst.rq_iov = iov;
1794         rqst.rq_nvec = 1;
1795
1796         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1797         cifs_small_buf_release(req);
1798         if (rc)
1799                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1800
1801         return rc;
1802 }
1803
1804
1805 static struct create_durable *
1806 create_durable_buf(void)
1807 {
1808         struct create_durable *buf;
1809
1810         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1811         if (!buf)
1812                 return NULL;
1813
1814         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1815                                         (struct create_durable, Data));
1816         buf->ccontext.DataLength = cpu_to_le32(16);
1817         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1818                                 (struct create_durable, Name));
1819         buf->ccontext.NameLength = cpu_to_le16(4);
1820         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1821         buf->Name[0] = 'D';
1822         buf->Name[1] = 'H';
1823         buf->Name[2] = 'n';
1824         buf->Name[3] = 'Q';
1825         return buf;
1826 }
1827
1828 static struct create_durable *
1829 create_reconnect_durable_buf(struct cifs_fid *fid)
1830 {
1831         struct create_durable *buf;
1832
1833         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1834         if (!buf)
1835                 return NULL;
1836
1837         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1838                                         (struct create_durable, Data));
1839         buf->ccontext.DataLength = cpu_to_le32(16);
1840         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1841                                 (struct create_durable, Name));
1842         buf->ccontext.NameLength = cpu_to_le16(4);
1843         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1844         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1845         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1846         buf->Name[0] = 'D';
1847         buf->Name[1] = 'H';
1848         buf->Name[2] = 'n';
1849         buf->Name[3] = 'C';
1850         return buf;
1851 }
1852
1853 __u8
1854 smb2_parse_lease_state(struct TCP_Server_Info *server,
1855                        struct smb2_create_rsp *rsp,
1856                        unsigned int *epoch, char *lease_key)
1857 {
1858         char *data_offset;
1859         struct create_context *cc;
1860         unsigned int next;
1861         unsigned int remaining;
1862         char *name;
1863
1864         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1865         remaining = le32_to_cpu(rsp->CreateContextsLength);
1866         cc = (struct create_context *)data_offset;
1867         while (remaining >= sizeof(struct create_context)) {
1868                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1869                 if (le16_to_cpu(cc->NameLength) == 4 &&
1870                     strncmp(name, "RqLs", 4) == 0)
1871                         return server->ops->parse_lease_buf(cc, epoch,
1872                                                             lease_key);
1873
1874                 next = le32_to_cpu(cc->Next);
1875                 if (!next)
1876                         break;
1877                 remaining -= next;
1878                 cc = (struct create_context *)((char *)cc + next);
1879         }
1880
1881         return 0;
1882 }
1883
1884 static int
1885 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1886                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1887 {
1888         struct smb2_create_req *req = iov[0].iov_base;
1889         unsigned int num = *num_iovec;
1890
1891         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1892         if (iov[num].iov_base == NULL)
1893                 return -ENOMEM;
1894         iov[num].iov_len = server->vals->create_lease_size;
1895         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1896         if (!req->CreateContextsOffset)
1897                 req->CreateContextsOffset = cpu_to_le32(
1898                                 sizeof(struct smb2_create_req) +
1899                                 iov[num - 1].iov_len);
1900         le32_add_cpu(&req->CreateContextsLength,
1901                      server->vals->create_lease_size);
1902         *num_iovec = num + 1;
1903         return 0;
1904 }
1905
1906 static struct create_durable_v2 *
1907 create_durable_v2_buf(struct cifs_open_parms *oparms)
1908 {
1909         struct cifs_fid *pfid = oparms->fid;
1910         struct create_durable_v2 *buf;
1911
1912         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1913         if (!buf)
1914                 return NULL;
1915
1916         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1917                                         (struct create_durable_v2, dcontext));
1918         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1919         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1920                                 (struct create_durable_v2, Name));
1921         buf->ccontext.NameLength = cpu_to_le16(4);
1922
1923         /*
1924          * NB: Handle timeout defaults to 0, which allows server to choose
1925          * (most servers default to 120 seconds) and most clients default to 0.
1926          * This can be overridden at mount ("handletimeout=") if the user wants
1927          * a different persistent (or resilient) handle timeout for all opens
1928          * opens on a particular SMB3 mount.
1929          */
1930         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
1931         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1932         generate_random_uuid(buf->dcontext.CreateGuid);
1933         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1934
1935         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1936         buf->Name[0] = 'D';
1937         buf->Name[1] = 'H';
1938         buf->Name[2] = '2';
1939         buf->Name[3] = 'Q';
1940         return buf;
1941 }
1942
1943 static struct create_durable_handle_reconnect_v2 *
1944 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1945 {
1946         struct create_durable_handle_reconnect_v2 *buf;
1947
1948         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1949                         GFP_KERNEL);
1950         if (!buf)
1951                 return NULL;
1952
1953         buf->ccontext.DataOffset =
1954                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1955                                      dcontext));
1956         buf->ccontext.DataLength =
1957                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1958         buf->ccontext.NameOffset =
1959                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1960                             Name));
1961         buf->ccontext.NameLength = cpu_to_le16(4);
1962
1963         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1964         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1965         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1966         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1967
1968         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1969         buf->Name[0] = 'D';
1970         buf->Name[1] = 'H';
1971         buf->Name[2] = '2';
1972         buf->Name[3] = 'C';
1973         return buf;
1974 }
1975
1976 static int
1977 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1978                     struct cifs_open_parms *oparms)
1979 {
1980         struct smb2_create_req *req = iov[0].iov_base;
1981         unsigned int num = *num_iovec;
1982
1983         iov[num].iov_base = create_durable_v2_buf(oparms);
1984         if (iov[num].iov_base == NULL)
1985                 return -ENOMEM;
1986         iov[num].iov_len = sizeof(struct create_durable_v2);
1987         if (!req->CreateContextsOffset)
1988                 req->CreateContextsOffset =
1989                         cpu_to_le32(sizeof(struct smb2_create_req) +
1990                                                                 iov[1].iov_len);
1991         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1992         *num_iovec = num + 1;
1993         return 0;
1994 }
1995
1996 static int
1997 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1998                     struct cifs_open_parms *oparms)
1999 {
2000         struct smb2_create_req *req = iov[0].iov_base;
2001         unsigned int num = *num_iovec;
2002
2003         /* indicate that we don't need to relock the file */
2004         oparms->reconnect = false;
2005
2006         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2007         if (iov[num].iov_base == NULL)
2008                 return -ENOMEM;
2009         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2010         if (!req->CreateContextsOffset)
2011                 req->CreateContextsOffset =
2012                         cpu_to_le32(sizeof(struct smb2_create_req) +
2013                                                                 iov[1].iov_len);
2014         le32_add_cpu(&req->CreateContextsLength,
2015                         sizeof(struct create_durable_handle_reconnect_v2));
2016         *num_iovec = num + 1;
2017         return 0;
2018 }
2019
2020 static int
2021 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2022                     struct cifs_open_parms *oparms, bool use_persistent)
2023 {
2024         struct smb2_create_req *req = iov[0].iov_base;
2025         unsigned int num = *num_iovec;
2026
2027         if (use_persistent) {
2028                 if (oparms->reconnect)
2029                         return add_durable_reconnect_v2_context(iov, num_iovec,
2030                                                                 oparms);
2031                 else
2032                         return add_durable_v2_context(iov, num_iovec, oparms);
2033         }
2034
2035         if (oparms->reconnect) {
2036                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2037                 /* indicate that we don't need to relock the file */
2038                 oparms->reconnect = false;
2039         } else
2040                 iov[num].iov_base = create_durable_buf();
2041         if (iov[num].iov_base == NULL)
2042                 return -ENOMEM;
2043         iov[num].iov_len = sizeof(struct create_durable);
2044         if (!req->CreateContextsOffset)
2045                 req->CreateContextsOffset =
2046                         cpu_to_le32(sizeof(struct smb2_create_req) +
2047                                                                 iov[1].iov_len);
2048         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2049         *num_iovec = num + 1;
2050         return 0;
2051 }
2052
2053 /* See MS-SMB2 2.2.13.2.7 */
2054 static struct crt_twarp_ctxt *
2055 create_twarp_buf(__u64 timewarp)
2056 {
2057         struct crt_twarp_ctxt *buf;
2058
2059         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2060         if (!buf)
2061                 return NULL;
2062
2063         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2064                                         (struct crt_twarp_ctxt, Timestamp));
2065         buf->ccontext.DataLength = cpu_to_le32(8);
2066         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2067                                 (struct crt_twarp_ctxt, Name));
2068         buf->ccontext.NameLength = cpu_to_le16(4);
2069         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2070         buf->Name[0] = 'T';
2071         buf->Name[1] = 'W';
2072         buf->Name[2] = 'r';
2073         buf->Name[3] = 'p';
2074         buf->Timestamp = cpu_to_le64(timewarp);
2075         return buf;
2076 }
2077
2078 /* See MS-SMB2 2.2.13.2.7 */
2079 static int
2080 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2081 {
2082         struct smb2_create_req *req = iov[0].iov_base;
2083         unsigned int num = *num_iovec;
2084
2085         iov[num].iov_base = create_twarp_buf(timewarp);
2086         if (iov[num].iov_base == NULL)
2087                 return -ENOMEM;
2088         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2089         if (!req->CreateContextsOffset)
2090                 req->CreateContextsOffset = cpu_to_le32(
2091                                 sizeof(struct smb2_create_req) +
2092                                 iov[num - 1].iov_len);
2093         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2094         *num_iovec = num + 1;
2095         return 0;
2096 }
2097
2098 static int
2099 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2100                             const char *treename, const __le16 *path)
2101 {
2102         int treename_len, path_len;
2103         struct nls_table *cp;
2104         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2105
2106         /*
2107          * skip leading "\\"
2108          */
2109         treename_len = strlen(treename);
2110         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2111                 return -EINVAL;
2112
2113         treename += 2;
2114         treename_len -= 2;
2115
2116         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2117
2118         /*
2119          * make room for one path separator between the treename and
2120          * path
2121          */
2122         *out_len = treename_len + 1 + path_len;
2123
2124         /*
2125          * final path needs to be null-terminated UTF16 with a
2126          * size aligned to 8
2127          */
2128
2129         *out_size = roundup((*out_len+1)*2, 8);
2130         *out_path = kzalloc(*out_size, GFP_KERNEL);
2131         if (!*out_path)
2132                 return -ENOMEM;
2133
2134         cp = load_nls_default();
2135         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2136         UniStrcat(*out_path, sep);
2137         UniStrcat(*out_path, path);
2138         unload_nls(cp);
2139
2140         return 0;
2141 }
2142
2143 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2144                                umode_t mode, struct cifs_tcon *tcon,
2145                                const char *full_path,
2146                                struct cifs_sb_info *cifs_sb)
2147 {
2148         struct smb_rqst rqst;
2149         struct smb2_create_req *req;
2150         struct smb2_create_rsp *rsp = NULL;
2151         struct cifs_ses *ses = tcon->ses;
2152         struct kvec iov[3]; /* make sure at least one for each open context */
2153         struct kvec rsp_iov = {NULL, 0};
2154         int resp_buftype;
2155         int uni_path_len;
2156         __le16 *copy_path = NULL;
2157         int copy_size;
2158         int rc = 0;
2159         unsigned int n_iov = 2;
2160         __u32 file_attributes = 0;
2161         char *pc_buf = NULL;
2162         int flags = 0;
2163         unsigned int total_len;
2164         __le16 *utf16_path = NULL;
2165
2166         cifs_dbg(FYI, "mkdir\n");
2167
2168         /* resource #1: path allocation */
2169         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2170         if (!utf16_path)
2171                 return -ENOMEM;
2172
2173         if (!ses || !(ses->server)) {
2174                 rc = -EIO;
2175                 goto err_free_path;
2176         }
2177
2178         /* resource #2: request */
2179         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2180         if (rc)
2181                 goto err_free_path;
2182
2183
2184         if (smb3_encryption_required(tcon))
2185                 flags |= CIFS_TRANSFORM_REQ;
2186
2187         req->ImpersonationLevel = IL_IMPERSONATION;
2188         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2189         /* File attributes ignored on open (used in create though) */
2190         req->FileAttributes = cpu_to_le32(file_attributes);
2191         req->ShareAccess = FILE_SHARE_ALL_LE;
2192         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2193         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2194
2195         iov[0].iov_base = (char *)req;
2196         /* -1 since last byte is buf[0] which is sent below (path) */
2197         iov[0].iov_len = total_len - 1;
2198
2199         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2200
2201         /* [MS-SMB2] 2.2.13 NameOffset:
2202          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2203          * the SMB2 header, the file name includes a prefix that will
2204          * be processed during DFS name normalization as specified in
2205          * section 3.3.5.9. Otherwise, the file name is relative to
2206          * the share that is identified by the TreeId in the SMB2
2207          * header.
2208          */
2209         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2210                 int name_len;
2211
2212                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2213                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2214                                                  &name_len,
2215                                                  tcon->treeName, utf16_path);
2216                 if (rc)
2217                         goto err_free_req;
2218
2219                 req->NameLength = cpu_to_le16(name_len * 2);
2220                 uni_path_len = copy_size;
2221                 /* free before overwriting resource */
2222                 kfree(utf16_path);
2223                 utf16_path = copy_path;
2224         } else {
2225                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2226                 /* MUST set path len (NameLength) to 0 opening root of share */
2227                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2228                 if (uni_path_len % 8 != 0) {
2229                         copy_size = roundup(uni_path_len, 8);
2230                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2231                         if (!copy_path) {
2232                                 rc = -ENOMEM;
2233                                 goto err_free_req;
2234                         }
2235                         memcpy((char *)copy_path, (const char *)utf16_path,
2236                                uni_path_len);
2237                         uni_path_len = copy_size;
2238                         /* free before overwriting resource */
2239                         kfree(utf16_path);
2240                         utf16_path = copy_path;
2241                 }
2242         }
2243
2244         iov[1].iov_len = uni_path_len;
2245         iov[1].iov_base = utf16_path;
2246         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2247
2248         if (tcon->posix_extensions) {
2249                 /* resource #3: posix buf */
2250                 rc = add_posix_context(iov, &n_iov, mode);
2251                 if (rc)
2252                         goto err_free_req;
2253                 pc_buf = iov[n_iov-1].iov_base;
2254         }
2255
2256
2257         memset(&rqst, 0, sizeof(struct smb_rqst));
2258         rqst.rq_iov = iov;
2259         rqst.rq_nvec = n_iov;
2260
2261         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2262                                     FILE_WRITE_ATTRIBUTES);
2263         /* resource #4: response buffer */
2264         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2265         if (rc) {
2266                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2267                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2268                                            CREATE_NOT_FILE,
2269                                            FILE_WRITE_ATTRIBUTES, rc);
2270                 goto err_free_rsp_buf;
2271         }
2272
2273         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2274         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2275                                     ses->Suid, CREATE_NOT_FILE,
2276                                     FILE_WRITE_ATTRIBUTES);
2277
2278         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2279
2280         /* Eventually save off posix specific response info and timestaps */
2281
2282 err_free_rsp_buf:
2283         free_rsp_buf(resp_buftype, rsp);
2284         kfree(pc_buf);
2285 err_free_req:
2286         cifs_small_buf_release(req);
2287 err_free_path:
2288         kfree(utf16_path);
2289         return rc;
2290 }
2291
2292 int
2293 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2294                struct cifs_open_parms *oparms, __le16 *path)
2295 {
2296         struct TCP_Server_Info *server = tcon->ses->server;
2297         struct smb2_create_req *req;
2298         unsigned int n_iov = 2;
2299         __u32 file_attributes = 0;
2300         int copy_size;
2301         int uni_path_len;
2302         unsigned int total_len;
2303         struct kvec *iov = rqst->rq_iov;
2304         __le16 *copy_path;
2305         int rc;
2306
2307         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2308         if (rc)
2309                 return rc;
2310
2311         iov[0].iov_base = (char *)req;
2312         /* -1 since last byte is buf[0] which is sent below (path) */
2313         iov[0].iov_len = total_len - 1;
2314
2315         if (oparms->create_options & CREATE_OPTION_READONLY)
2316                 file_attributes |= ATTR_READONLY;
2317         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2318                 file_attributes |= ATTR_SYSTEM;
2319
2320         req->ImpersonationLevel = IL_IMPERSONATION;
2321         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2322         /* File attributes ignored on open (used in create though) */
2323         req->FileAttributes = cpu_to_le32(file_attributes);
2324         req->ShareAccess = FILE_SHARE_ALL_LE;
2325         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2326         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2327         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2328
2329         /* [MS-SMB2] 2.2.13 NameOffset:
2330          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2331          * the SMB2 header, the file name includes a prefix that will
2332          * be processed during DFS name normalization as specified in
2333          * section 3.3.5.9. Otherwise, the file name is relative to
2334          * the share that is identified by the TreeId in the SMB2
2335          * header.
2336          */
2337         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2338                 int name_len;
2339
2340                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2341                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2342                                                  &name_len,
2343                                                  tcon->treeName, path);
2344                 if (rc)
2345                         return rc;
2346                 req->NameLength = cpu_to_le16(name_len * 2);
2347                 uni_path_len = copy_size;
2348                 path = copy_path;
2349         } else {
2350                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2351                 /* MUST set path len (NameLength) to 0 opening root of share */
2352                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2353                 copy_size = uni_path_len;
2354                 if (copy_size % 8 != 0)
2355                         copy_size = roundup(copy_size, 8);
2356                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2357                 if (!copy_path)
2358                         return -ENOMEM;
2359                 memcpy((char *)copy_path, (const char *)path,
2360                        uni_path_len);
2361                 uni_path_len = copy_size;
2362                 path = copy_path;
2363         }
2364
2365         iov[1].iov_len = uni_path_len;
2366         iov[1].iov_base = path;
2367
2368         if (!server->oplocks)
2369                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2370
2371         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2372             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2373                 req->RequestedOplockLevel = *oplock;
2374         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2375                   (oparms->create_options & CREATE_NOT_FILE))
2376                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2377         else {
2378                 rc = add_lease_context(server, iov, &n_iov,
2379                                        oparms->fid->lease_key, oplock);
2380                 if (rc)
2381                         return rc;
2382         }
2383
2384         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2385                 /* need to set Next field of lease context if we request it */
2386                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2387                         struct create_context *ccontext =
2388                             (struct create_context *)iov[n_iov-1].iov_base;
2389                         ccontext->Next =
2390                                 cpu_to_le32(server->vals->create_lease_size);
2391                 }
2392
2393                 rc = add_durable_context(iov, &n_iov, oparms,
2394                                         tcon->use_persistent);
2395                 if (rc)
2396                         return rc;
2397         }
2398
2399         if (tcon->posix_extensions) {
2400                 if (n_iov > 2) {
2401                         struct create_context *ccontext =
2402                             (struct create_context *)iov[n_iov-1].iov_base;
2403                         ccontext->Next =
2404                                 cpu_to_le32(iov[n_iov-1].iov_len);
2405                 }
2406
2407                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2408                 if (rc)
2409                         return rc;
2410         }
2411
2412         if (tcon->snapshot_time) {
2413                 cifs_dbg(FYI, "adding snapshot context\n");
2414                 if (n_iov > 2) {
2415                         struct create_context *ccontext =
2416                             (struct create_context *)iov[n_iov-1].iov_base;
2417                         ccontext->Next =
2418                                 cpu_to_le32(iov[n_iov-1].iov_len);
2419                 }
2420
2421                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2422                 if (rc)
2423                         return rc;
2424         }
2425
2426
2427         rqst->rq_nvec = n_iov;
2428         return 0;
2429 }
2430
2431 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2432  * All other vectors are freed by kfree().
2433  */
2434 void
2435 SMB2_open_free(struct smb_rqst *rqst)
2436 {
2437         int i;
2438
2439         if (rqst && rqst->rq_iov) {
2440                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2441                 for (i = 1; i < rqst->rq_nvec; i++)
2442                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2443                                 kfree(rqst->rq_iov[i].iov_base);
2444         }
2445 }
2446
2447 int
2448 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2449           __u8 *oplock, struct smb2_file_all_info *buf,
2450           struct kvec *err_iov, int *buftype)
2451 {
2452         struct smb_rqst rqst;
2453         struct smb2_create_rsp *rsp = NULL;
2454         struct TCP_Server_Info *server;
2455         struct cifs_tcon *tcon = oparms->tcon;
2456         struct cifs_ses *ses = tcon->ses;
2457         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2458         struct kvec rsp_iov = {NULL, 0};
2459         int resp_buftype = CIFS_NO_BUFFER;
2460         int rc = 0;
2461         int flags = 0;
2462
2463         cifs_dbg(FYI, "create/open\n");
2464         if (ses && (ses->server))
2465                 server = ses->server;
2466         else
2467                 return -EIO;
2468
2469         if (smb3_encryption_required(tcon))
2470                 flags |= CIFS_TRANSFORM_REQ;
2471
2472         memset(&rqst, 0, sizeof(struct smb_rqst));
2473         memset(&iov, 0, sizeof(iov));
2474         rqst.rq_iov = iov;
2475         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2476
2477         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2478         if (rc)
2479                 goto creat_exit;
2480
2481         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2482                 oparms->create_options, oparms->desired_access);
2483
2484         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2485                             &rsp_iov);
2486         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2487
2488         if (rc != 0) {
2489                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2490                 if (err_iov && rsp) {
2491                         *err_iov = rsp_iov;
2492                         *buftype = resp_buftype;
2493                         resp_buftype = CIFS_NO_BUFFER;
2494                         rsp = NULL;
2495                 }
2496                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2497                                     oparms->create_options, oparms->desired_access, rc);
2498                 goto creat_exit;
2499         } else
2500                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2501                                      ses->Suid, oparms->create_options,
2502                                      oparms->desired_access);
2503
2504         atomic_inc(&tcon->num_remote_opens);
2505         oparms->fid->persistent_fid = rsp->PersistentFileId;
2506         oparms->fid->volatile_fid = rsp->VolatileFileId;
2507 #ifdef CONFIG_CIFS_DEBUG2
2508         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2509 #endif /* CIFS_DEBUG2 */
2510
2511         if (buf) {
2512                 memcpy(buf, &rsp->CreationTime, 32);
2513                 buf->AllocationSize = rsp->AllocationSize;
2514                 buf->EndOfFile = rsp->EndofFile;
2515                 buf->Attributes = rsp->FileAttributes;
2516                 buf->NumberOfLinks = cpu_to_le32(1);
2517                 buf->DeletePending = 0;
2518         }
2519
2520         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2521                 *oplock = smb2_parse_lease_state(server, rsp,
2522                                                  &oparms->fid->epoch,
2523                                                  oparms->fid->lease_key);
2524         else
2525                 *oplock = rsp->OplockLevel;
2526 creat_exit:
2527         SMB2_open_free(&rqst);
2528         free_rsp_buf(resp_buftype, rsp);
2529         return rc;
2530 }
2531
2532 int
2533 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2534                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2535                 bool is_fsctl, char *in_data, u32 indatalen,
2536                 __u32 max_response_size)
2537 {
2538         struct smb2_ioctl_req *req;
2539         struct kvec *iov = rqst->rq_iov;
2540         unsigned int total_len;
2541         int rc;
2542         char *in_data_buf;
2543
2544         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2545         if (rc)
2546                 return rc;
2547
2548         if (indatalen) {
2549                 /*
2550                  * indatalen is usually small at a couple of bytes max, so
2551                  * just allocate through generic pool
2552                  */
2553                 in_data_buf = kmalloc(indatalen, GFP_NOFS);
2554                 if (!in_data_buf) {
2555                         cifs_small_buf_release(req);
2556                         return -ENOMEM;
2557                 }
2558                 memcpy(in_data_buf, in_data, indatalen);
2559         }
2560
2561         req->CtlCode = cpu_to_le32(opcode);
2562         req->PersistentFileId = persistent_fid;
2563         req->VolatileFileId = volatile_fid;
2564
2565         iov[0].iov_base = (char *)req;
2566         /*
2567          * If no input data, the size of ioctl struct in
2568          * protocol spec still includes a 1 byte data buffer,
2569          * but if input data passed to ioctl, we do not
2570          * want to double count this, so we do not send
2571          * the dummy one byte of data in iovec[0] if sending
2572          * input data (in iovec[1]).
2573          */
2574         if (indatalen) {
2575                 req->InputCount = cpu_to_le32(indatalen);
2576                 /* do not set InputOffset if no input data */
2577                 req->InputOffset =
2578                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2579                 rqst->rq_nvec = 2;
2580                 iov[0].iov_len = total_len - 1;
2581                 iov[1].iov_base = in_data_buf;
2582                 iov[1].iov_len = indatalen;
2583         } else {
2584                 rqst->rq_nvec = 1;
2585                 iov[0].iov_len = total_len;
2586         }
2587
2588         req->OutputOffset = 0;
2589         req->OutputCount = 0; /* MBZ */
2590
2591         /*
2592          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2593          * We Could increase default MaxOutputResponse, but that could require
2594          * more credits. Windows typically sets this smaller, but for some
2595          * ioctls it may be useful to allow server to send more. No point
2596          * limiting what the server can send as long as fits in one credit
2597          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2598          * to increase this limit up in the future.
2599          * Note that for snapshot queries that servers like Azure expect that
2600          * the first query be minimal size (and just used to get the number/size
2601          * of previous versions) so response size must be specified as EXACTLY
2602          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2603          * of eight bytes.  Currently that is the only case where we set max
2604          * response size smaller.
2605          */
2606         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2607
2608         if (is_fsctl)
2609                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2610         else
2611                 req->Flags = 0;
2612
2613         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2614         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2615                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2616
2617         return 0;
2618 }
2619
2620 void
2621 SMB2_ioctl_free(struct smb_rqst *rqst)
2622 {
2623         int i;
2624         if (rqst && rqst->rq_iov) {
2625                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2626                 for (i = 1; i < rqst->rq_nvec; i++)
2627                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2628                                 kfree(rqst->rq_iov[i].iov_base);
2629         }
2630 }
2631
2632
2633 /*
2634  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2635  */
2636 int
2637 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2638            u64 volatile_fid, u32 opcode, bool is_fsctl,
2639            char *in_data, u32 indatalen, u32 max_out_data_len,
2640            char **out_data, u32 *plen /* returned data len */)
2641 {
2642         struct smb_rqst rqst;
2643         struct smb2_ioctl_rsp *rsp = NULL;
2644         struct cifs_ses *ses;
2645         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2646         struct kvec rsp_iov = {NULL, 0};
2647         int resp_buftype = CIFS_NO_BUFFER;
2648         int rc = 0;
2649         int flags = 0;
2650
2651         cifs_dbg(FYI, "SMB2 IOCTL\n");
2652
2653         if (out_data != NULL)
2654                 *out_data = NULL;
2655
2656         /* zero out returned data len, in case of error */
2657         if (plen)
2658                 *plen = 0;
2659
2660         if (tcon)
2661                 ses = tcon->ses;
2662         else
2663                 return -EIO;
2664
2665         if (!ses || !(ses->server))
2666                 return -EIO;
2667
2668         if (smb3_encryption_required(tcon))
2669                 flags |= CIFS_TRANSFORM_REQ;
2670
2671         memset(&rqst, 0, sizeof(struct smb_rqst));
2672         memset(&iov, 0, sizeof(iov));
2673         rqst.rq_iov = iov;
2674         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2675
2676         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
2677                              is_fsctl, in_data, indatalen, max_out_data_len);
2678         if (rc)
2679                 goto ioctl_exit;
2680
2681         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2682                             &rsp_iov);
2683         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2684
2685         if (rc != 0)
2686                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2687                                 ses->Suid, 0, opcode, rc);
2688
2689         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
2690                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2691                 goto ioctl_exit;
2692         } else if (rc == -EINVAL) {
2693                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2694                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2695                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2696                         goto ioctl_exit;
2697                 }
2698         } else if (rc == -E2BIG) {
2699                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
2700                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2701                         goto ioctl_exit;
2702                 }
2703         }
2704
2705         /* check if caller wants to look at return data or just return rc */
2706         if ((plen == NULL) || (out_data == NULL))
2707                 goto ioctl_exit;
2708
2709         *plen = le32_to_cpu(rsp->OutputCount);
2710
2711         /* We check for obvious errors in the output buffer length and offset */
2712         if (*plen == 0)
2713                 goto ioctl_exit; /* server returned no data */
2714         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2715                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2716                 *plen = 0;
2717                 rc = -EIO;
2718                 goto ioctl_exit;
2719         }
2720
2721         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2722                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2723                         le32_to_cpu(rsp->OutputOffset));
2724                 *plen = 0;
2725                 rc = -EIO;
2726                 goto ioctl_exit;
2727         }
2728
2729         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2730                             *plen, GFP_KERNEL);
2731         if (*out_data == NULL) {
2732                 rc = -ENOMEM;
2733                 goto ioctl_exit;
2734         }
2735
2736 ioctl_exit:
2737         SMB2_ioctl_free(&rqst);
2738         free_rsp_buf(resp_buftype, rsp);
2739         return rc;
2740 }
2741
2742 /*
2743  *   Individual callers to ioctl worker function follow
2744  */
2745
2746 int
2747 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2748                      u64 persistent_fid, u64 volatile_fid)
2749 {
2750         int rc;
2751         struct  compress_ioctl fsctl_input;
2752         char *ret_data = NULL;
2753
2754         fsctl_input.CompressionState =
2755                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2756
2757         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2758                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2759                         (char *)&fsctl_input /* data input */,
2760                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
2761                         &ret_data /* out data */, NULL);
2762
2763         cifs_dbg(FYI, "set compression rc %d\n", rc);
2764
2765         return rc;
2766 }
2767
2768 int
2769 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2770                 u64 persistent_fid, u64 volatile_fid)
2771 {
2772         struct smb2_close_req *req;
2773         struct kvec *iov = rqst->rq_iov;
2774         unsigned int total_len;
2775         int rc;
2776
2777         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2778         if (rc)
2779                 return rc;
2780
2781         req->PersistentFileId = persistent_fid;
2782         req->VolatileFileId = volatile_fid;
2783         iov[0].iov_base = (char *)req;
2784         iov[0].iov_len = total_len;
2785
2786         return 0;
2787 }
2788
2789 void
2790 SMB2_close_free(struct smb_rqst *rqst)
2791 {
2792         if (rqst && rqst->rq_iov)
2793                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2794 }
2795
2796 int
2797 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2798                  u64 persistent_fid, u64 volatile_fid, int flags)
2799 {
2800         struct smb_rqst rqst;
2801         struct smb2_close_rsp *rsp = NULL;
2802         struct cifs_ses *ses = tcon->ses;
2803         struct kvec iov[1];
2804         struct kvec rsp_iov;
2805         int resp_buftype = CIFS_NO_BUFFER;
2806         int rc = 0;
2807
2808         cifs_dbg(FYI, "Close\n");
2809
2810         if (!ses || !(ses->server))
2811                 return -EIO;
2812
2813         if (smb3_encryption_required(tcon))
2814                 flags |= CIFS_TRANSFORM_REQ;
2815
2816         memset(&rqst, 0, sizeof(struct smb_rqst));
2817         memset(&iov, 0, sizeof(iov));
2818         rqst.rq_iov = iov;
2819         rqst.rq_nvec = 1;
2820
2821         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2822         if (rc)
2823                 goto close_exit;
2824
2825         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2826         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2827
2828         if (rc != 0) {
2829                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2830                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2831                                      rc);
2832                 goto close_exit;
2833         }
2834
2835         atomic_dec(&tcon->num_remote_opens);
2836
2837         /* BB FIXME - decode close response, update inode for caching */
2838
2839 close_exit:
2840         SMB2_close_free(&rqst);
2841         free_rsp_buf(resp_buftype, rsp);
2842         return rc;
2843 }
2844
2845 int
2846 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2847            u64 persistent_fid, u64 volatile_fid)
2848 {
2849         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2850 }
2851
2852 int
2853 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2854                   struct kvec *iov, unsigned int min_buf_size)
2855 {
2856         unsigned int smb_len = iov->iov_len;
2857         char *end_of_smb = smb_len + (char *)iov->iov_base;
2858         char *begin_of_buf = offset + (char *)iov->iov_base;
2859         char *end_of_buf = begin_of_buf + buffer_length;
2860
2861
2862         if (buffer_length < min_buf_size) {
2863                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2864                          buffer_length, min_buf_size);
2865                 return -EINVAL;
2866         }
2867
2868         /* check if beyond RFC1001 maximum length */
2869         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2870                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2871                          buffer_length, smb_len);
2872                 return -EINVAL;
2873         }
2874
2875         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2876                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2877                 return -EINVAL;
2878         }
2879
2880         return 0;
2881 }
2882
2883 /*
2884  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2885  * Caller must free buffer.
2886  */
2887 int
2888 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2889                            struct kvec *iov, unsigned int minbufsize,
2890                            char *data)
2891 {
2892         char *begin_of_buf = offset + (char *)iov->iov_base;
2893         int rc;
2894
2895         if (!data)
2896                 return -EINVAL;
2897
2898         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2899         if (rc)
2900                 return rc;
2901
2902         memcpy(data, begin_of_buf, buffer_length);
2903
2904         return 0;
2905 }
2906
2907 int
2908 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2909                      u64 persistent_fid, u64 volatile_fid,
2910                      u8 info_class, u8 info_type, u32 additional_info,
2911                      size_t output_len, size_t input_len, void *input)
2912 {
2913         struct smb2_query_info_req *req;
2914         struct kvec *iov = rqst->rq_iov;
2915         unsigned int total_len;
2916         int rc;
2917
2918         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2919                              &total_len);
2920         if (rc)
2921                 return rc;
2922
2923         req->InfoType = info_type;
2924         req->FileInfoClass = info_class;
2925         req->PersistentFileId = persistent_fid;
2926         req->VolatileFileId = volatile_fid;
2927         req->AdditionalInformation = cpu_to_le32(additional_info);
2928
2929         req->OutputBufferLength = cpu_to_le32(output_len);
2930         if (input_len) {
2931                 req->InputBufferLength = cpu_to_le32(input_len);
2932                 /* total_len for smb query request never close to le16 max */
2933                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2934                 memcpy(req->Buffer, input, input_len);
2935         }
2936
2937         iov[0].iov_base = (char *)req;
2938         /* 1 for Buffer */
2939         iov[0].iov_len = total_len - 1 + input_len;
2940         return 0;
2941 }
2942
2943 void
2944 SMB2_query_info_free(struct smb_rqst *rqst)
2945 {
2946         if (rqst && rqst->rq_iov)
2947                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2948 }
2949
2950 static int
2951 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2952            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2953            u32 additional_info, size_t output_len, size_t min_len, void **data,
2954                 u32 *dlen)
2955 {
2956         struct smb_rqst rqst;
2957         struct smb2_query_info_rsp *rsp = NULL;
2958         struct kvec iov[1];
2959         struct kvec rsp_iov;
2960         int rc = 0;
2961         int resp_buftype = CIFS_NO_BUFFER;
2962         struct cifs_ses *ses = tcon->ses;
2963         int flags = 0;
2964         bool allocated = false;
2965
2966         cifs_dbg(FYI, "Query Info\n");
2967
2968         if (!ses || !(ses->server))
2969                 return -EIO;
2970
2971         if (smb3_encryption_required(tcon))
2972                 flags |= CIFS_TRANSFORM_REQ;
2973
2974         memset(&rqst, 0, sizeof(struct smb_rqst));
2975         memset(&iov, 0, sizeof(iov));
2976         rqst.rq_iov = iov;
2977         rqst.rq_nvec = 1;
2978
2979         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2980                                   info_class, info_type, additional_info,
2981                                   output_len, 0, NULL);
2982         if (rc)
2983                 goto qinf_exit;
2984
2985         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
2986                                     ses->Suid, info_class, (__u32)info_type);
2987
2988         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2989         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2990
2991         if (rc) {
2992                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2993                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2994                                 ses->Suid, info_class, (__u32)info_type, rc);
2995                 goto qinf_exit;
2996         }
2997
2998         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
2999                                 ses->Suid, info_class, (__u32)info_type);
3000
3001         if (dlen) {
3002                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3003                 if (!*data) {
3004                         *data = kmalloc(*dlen, GFP_KERNEL);
3005                         if (!*data) {
3006                                 cifs_dbg(VFS,
3007                                         "Error %d allocating memory for acl\n",
3008                                         rc);
3009                                 *dlen = 0;
3010                                 rc = -ENOMEM;
3011                                 goto qinf_exit;
3012                         }
3013                         allocated = true;
3014                 }
3015         }
3016
3017         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3018                                         le32_to_cpu(rsp->OutputBufferLength),
3019                                         &rsp_iov, min_len, *data);
3020         if (rc && allocated) {
3021                 kfree(*data);
3022                 *data = NULL;
3023                 *dlen = 0;
3024         }
3025
3026 qinf_exit:
3027         SMB2_query_info_free(&rqst);
3028         free_rsp_buf(resp_buftype, rsp);
3029         return rc;
3030 }
3031
3032 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3033         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3034 {
3035         return query_info(xid, tcon, persistent_fid, volatile_fid,
3036                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3037                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3038                           sizeof(struct smb2_file_all_info), (void **)&data,
3039                           NULL);
3040 }
3041
3042 int
3043 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3044                 u64 persistent_fid, u64 volatile_fid,
3045                 void **data, u32 *plen)
3046 {
3047         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3048         *plen = 0;
3049
3050         return query_info(xid, tcon, persistent_fid, volatile_fid,
3051                           0, SMB2_O_INFO_SECURITY, additional_info,
3052                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3053 }
3054
3055 int
3056 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3057                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3058 {
3059         return query_info(xid, tcon, persistent_fid, volatile_fid,
3060                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3061                           sizeof(struct smb2_file_internal_info),
3062                           sizeof(struct smb2_file_internal_info),
3063                           (void **)&uniqueid, NULL);
3064 }
3065
3066 /*
3067  * This is a no-op for now. We're not really interested in the reply, but
3068  * rather in the fact that the server sent one and that server->lstrp
3069  * gets updated.
3070  *
3071  * FIXME: maybe we should consider checking that the reply matches request?
3072  */
3073 static void
3074 smb2_echo_callback(struct mid_q_entry *mid)
3075 {
3076         struct TCP_Server_Info *server = mid->callback_data;
3077         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3078         struct cifs_credits credits = { .value = 0, .instance = 0 };
3079
3080         if (mid->mid_state == MID_RESPONSE_RECEIVED
3081             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3082                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3083                 credits.instance = server->reconnect_instance;
3084         }
3085
3086         DeleteMidQEntry(mid);
3087         add_credits(server, &credits, CIFS_ECHO_OP);
3088 }
3089
3090 void smb2_reconnect_server(struct work_struct *work)
3091 {
3092         struct TCP_Server_Info *server = container_of(work,
3093                                         struct TCP_Server_Info, reconnect.work);
3094         struct cifs_ses *ses;
3095         struct cifs_tcon *tcon, *tcon2;
3096         struct list_head tmp_list;
3097         int tcon_exist = false;
3098         int rc;
3099         int resched = false;
3100
3101
3102         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3103         mutex_lock(&server->reconnect_mutex);
3104
3105         INIT_LIST_HEAD(&tmp_list);
3106         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3107
3108         spin_lock(&cifs_tcp_ses_lock);
3109         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3110                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3111                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3112                                 tcon->tc_count++;
3113                                 list_add_tail(&tcon->rlist, &tmp_list);
3114                                 tcon_exist = true;
3115                         }
3116                 }
3117                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3118                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3119                         tcon_exist = true;
3120                 }
3121         }
3122         /*
3123          * Get the reference to server struct to be sure that the last call of
3124          * cifs_put_tcon() in the loop below won't release the server pointer.
3125          */
3126         if (tcon_exist)
3127                 server->srv_count++;
3128
3129         spin_unlock(&cifs_tcp_ses_lock);
3130
3131         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3132                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3133                 if (!rc)
3134                         cifs_reopen_persistent_handles(tcon);
3135                 else
3136                         resched = true;
3137                 list_del_init(&tcon->rlist);
3138                 cifs_put_tcon(tcon);
3139         }
3140
3141         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3142         if (resched)
3143                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3144         mutex_unlock(&server->reconnect_mutex);
3145
3146         /* now we can safely release srv struct */
3147         if (tcon_exist)
3148                 cifs_put_tcp_session(server, 1);
3149 }
3150
3151 int
3152 SMB2_echo(struct TCP_Server_Info *server)
3153 {
3154         struct smb2_echo_req *req;
3155         int rc = 0;
3156         struct kvec iov[1];
3157         struct smb_rqst rqst = { .rq_iov = iov,
3158                                  .rq_nvec = 1 };
3159         unsigned int total_len;
3160
3161         cifs_dbg(FYI, "In echo request\n");
3162
3163         if (server->tcpStatus == CifsNeedNegotiate) {
3164                 /* No need to send echo on newly established connections */
3165                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3166                 return rc;
3167         }
3168
3169         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3170         if (rc)
3171                 return rc;
3172
3173         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3174
3175         iov[0].iov_len = total_len;
3176         iov[0].iov_base = (char *)req;
3177
3178         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3179                              server, CIFS_ECHO_OP, NULL);
3180         if (rc)
3181                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3182
3183         cifs_small_buf_release(req);
3184         return rc;
3185 }
3186
3187 int
3188 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3189            u64 volatile_fid)
3190 {
3191         struct smb_rqst rqst;
3192         struct smb2_flush_req *req;
3193         struct cifs_ses *ses = tcon->ses;
3194         struct kvec iov[1];
3195         struct kvec rsp_iov;
3196         int resp_buftype;
3197         int rc = 0;
3198         int flags = 0;
3199         unsigned int total_len;
3200
3201         cifs_dbg(FYI, "Flush\n");
3202
3203         if (!ses || !(ses->server))
3204                 return -EIO;
3205
3206         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3207         if (rc)
3208                 return rc;
3209
3210         if (smb3_encryption_required(tcon))
3211                 flags |= CIFS_TRANSFORM_REQ;
3212
3213         req->PersistentFileId = persistent_fid;
3214         req->VolatileFileId = volatile_fid;
3215
3216         iov[0].iov_base = (char *)req;
3217         iov[0].iov_len = total_len;
3218
3219         memset(&rqst, 0, sizeof(struct smb_rqst));
3220         rqst.rq_iov = iov;
3221         rqst.rq_nvec = 1;
3222
3223         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3224         cifs_small_buf_release(req);
3225
3226         if (rc != 0) {
3227                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3228                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3229                                      rc);
3230         }
3231
3232         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3233         return rc;
3234 }
3235
3236 /*
3237  * To form a chain of read requests, any read requests after the first should
3238  * have the end_of_chain boolean set to true.
3239  */
3240 static int
3241 smb2_new_read_req(void **buf, unsigned int *total_len,
3242         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3243         unsigned int remaining_bytes, int request_type)
3244 {
3245         int rc = -EACCES;
3246         struct smb2_read_plain_req *req = NULL;
3247         struct smb2_sync_hdr *shdr;
3248         struct TCP_Server_Info *server;
3249
3250         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3251                                  total_len);
3252         if (rc)
3253                 return rc;
3254
3255         server = io_parms->tcon->ses->server;
3256         if (server == NULL)
3257                 return -ECONNABORTED;
3258
3259         shdr = &req->sync_hdr;
3260         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3261
3262         req->PersistentFileId = io_parms->persistent_fid;
3263         req->VolatileFileId = io_parms->volatile_fid;
3264         req->ReadChannelInfoOffset = 0; /* reserved */
3265         req->ReadChannelInfoLength = 0; /* reserved */
3266         req->Channel = 0; /* reserved */
3267         req->MinimumCount = 0;
3268         req->Length = cpu_to_le32(io_parms->length);
3269         req->Offset = cpu_to_le64(io_parms->offset);
3270
3271         trace_smb3_read_enter(0 /* xid */,
3272                         io_parms->persistent_fid,
3273                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3274                         io_parms->offset, io_parms->length);
3275 #ifdef CONFIG_CIFS_SMB_DIRECT
3276         /*
3277          * If we want to do a RDMA write, fill in and append
3278          * smbd_buffer_descriptor_v1 to the end of read request
3279          */
3280         if (server->rdma && rdata && !server->sign &&
3281                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3282
3283                 struct smbd_buffer_descriptor_v1 *v1;
3284                 bool need_invalidate =
3285                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3286
3287                 rdata->mr = smbd_register_mr(
3288                                 server->smbd_conn, rdata->pages,
3289                                 rdata->nr_pages, rdata->page_offset,
3290                                 rdata->tailsz, true, need_invalidate);
3291                 if (!rdata->mr)
3292                         return -EAGAIN;
3293
3294                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3295                 if (need_invalidate)
3296                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3297                 req->ReadChannelInfoOffset =
3298                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3299                 req->ReadChannelInfoLength =
3300                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3301                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3302                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3303                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3304                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3305
3306                 *total_len += sizeof(*v1) - 1;
3307         }
3308 #endif
3309         if (request_type & CHAINED_REQUEST) {
3310                 if (!(request_type & END_OF_CHAIN)) {
3311                         /* next 8-byte aligned request */
3312                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3313                         shdr->NextCommand = cpu_to_le32(*total_len);
3314                 } else /* END_OF_CHAIN */
3315                         shdr->NextCommand = 0;
3316                 if (request_type & RELATED_REQUEST) {
3317                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3318                         /*
3319                          * Related requests use info from previous read request
3320                          * in chain.
3321                          */
3322                         shdr->SessionId = 0xFFFFFFFF;
3323                         shdr->TreeId = 0xFFFFFFFF;
3324                         req->PersistentFileId = 0xFFFFFFFF;
3325                         req->VolatileFileId = 0xFFFFFFFF;
3326                 }
3327         }
3328         if (remaining_bytes > io_parms->length)
3329                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3330         else
3331                 req->RemainingBytes = 0;
3332
3333         *buf = req;
3334         return rc;
3335 }
3336
3337 static void
3338 smb2_readv_callback(struct mid_q_entry *mid)
3339 {
3340         struct cifs_readdata *rdata = mid->callback_data;
3341         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3342         struct TCP_Server_Info *server = tcon->ses->server;
3343         struct smb2_sync_hdr *shdr =
3344                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3345         struct cifs_credits credits = { .value = 0, .instance = 0 };
3346         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3347                                  .rq_nvec = 2,
3348                                  .rq_pages = rdata->pages,
3349                                  .rq_offset = rdata->page_offset,
3350                                  .rq_npages = rdata->nr_pages,
3351                                  .rq_pagesz = rdata->pagesz,
3352                                  .rq_tailsz = rdata->tailsz };
3353
3354         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3355                  __func__, mid->mid, mid->mid_state, rdata->result,
3356                  rdata->bytes);
3357
3358         switch (mid->mid_state) {
3359         case MID_RESPONSE_RECEIVED:
3360                 credits.value = le16_to_cpu(shdr->CreditRequest);
3361                 credits.instance = server->reconnect_instance;
3362                 /* result already set, check signature */
3363                 if (server->sign && !mid->decrypted) {
3364                         int rc;
3365
3366                         rc = smb2_verify_signature(&rqst, server);
3367                         if (rc)
3368                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3369                                          rc);
3370                 }
3371                 /* FIXME: should this be counted toward the initiating task? */
3372                 task_io_account_read(rdata->got_bytes);
3373                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3374                 break;
3375         case MID_REQUEST_SUBMITTED:
3376         case MID_RETRY_NEEDED:
3377                 rdata->result = -EAGAIN;
3378                 if (server->sign && rdata->got_bytes)
3379                         /* reset bytes number since we can not check a sign */
3380                         rdata->got_bytes = 0;
3381                 /* FIXME: should this be counted toward the initiating task? */
3382                 task_io_account_read(rdata->got_bytes);
3383                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3384                 break;
3385         case MID_RESPONSE_MALFORMED:
3386                 credits.value = le16_to_cpu(shdr->CreditRequest);
3387                 credits.instance = server->reconnect_instance;
3388                 /* fall through */
3389         default:
3390                 rdata->result = -EIO;
3391         }
3392 #ifdef CONFIG_CIFS_SMB_DIRECT
3393         /*
3394          * If this rdata has a memmory registered, the MR can be freed
3395          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3396          * because they have limited number and are used for future I/Os
3397          */
3398         if (rdata->mr) {
3399                 smbd_deregister_mr(rdata->mr);
3400                 rdata->mr = NULL;
3401         }
3402 #endif
3403         if (rdata->result && rdata->result != -ENODATA) {
3404                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3405                 trace_smb3_read_err(0 /* xid */,
3406                                     rdata->cfile->fid.persistent_fid,
3407                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3408                                     rdata->bytes, rdata->result);
3409         } else
3410                 trace_smb3_read_done(0 /* xid */,
3411                                      rdata->cfile->fid.persistent_fid,
3412                                      tcon->tid, tcon->ses->Suid,
3413                                      rdata->offset, rdata->got_bytes);
3414
3415         queue_work(cifsiod_wq, &rdata->work);
3416         DeleteMidQEntry(mid);
3417         add_credits(server, &credits, 0);
3418 }
3419
3420 /* smb2_async_readv - send an async read, and set up mid to handle result */
3421 int
3422 smb2_async_readv(struct cifs_readdata *rdata)
3423 {
3424         int rc, flags = 0;
3425         char *buf;
3426         struct smb2_sync_hdr *shdr;
3427         struct cifs_io_parms io_parms;
3428         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3429                                  .rq_nvec = 1 };
3430         struct TCP_Server_Info *server;
3431         unsigned int total_len;
3432
3433         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3434                  __func__, rdata->offset, rdata->bytes);
3435
3436         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3437         io_parms.offset = rdata->offset;
3438         io_parms.length = rdata->bytes;
3439         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3440         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3441         io_parms.pid = rdata->pid;
3442
3443         server = io_parms.tcon->ses->server;
3444
3445         rc = smb2_new_read_req(
3446                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3447         if (rc)
3448                 return rc;
3449
3450         if (smb3_encryption_required(io_parms.tcon))
3451                 flags |= CIFS_TRANSFORM_REQ;
3452
3453         rdata->iov[0].iov_base = buf;
3454         rdata->iov[0].iov_len = total_len;
3455
3456         shdr = (struct smb2_sync_hdr *)buf;
3457
3458         if (rdata->credits.value > 0) {
3459                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3460                                                 SMB2_MAX_BUFFER_SIZE));
3461                 shdr->CreditRequest =
3462                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3463
3464                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3465                 if (rc)
3466                         goto async_readv_out;
3467
3468                 flags |= CIFS_HAS_CREDITS;
3469         }
3470
3471         kref_get(&rdata->refcount);
3472         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3473                              cifs_readv_receive, smb2_readv_callback,
3474                              smb3_handle_read_data, rdata, flags,
3475                              &rdata->credits);
3476         if (rc) {
3477                 kref_put(&rdata->refcount, cifs_readdata_release);
3478                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3479                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3480                                     io_parms.tcon->tid,
3481                                     io_parms.tcon->ses->Suid,
3482                                     io_parms.offset, io_parms.length, rc);
3483         }
3484
3485 async_readv_out:
3486         cifs_small_buf_release(buf);
3487         return rc;
3488 }
3489
3490 int
3491 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3492           unsigned int *nbytes, char **buf, int *buf_type)
3493 {
3494         struct smb_rqst rqst;
3495         int resp_buftype, rc = -EACCES;
3496         struct smb2_read_plain_req *req = NULL;
3497         struct smb2_read_rsp *rsp = NULL;
3498         struct kvec iov[1];
3499         struct kvec rsp_iov;
3500         unsigned int total_len;
3501         int flags = CIFS_LOG_ERROR;
3502         struct cifs_ses *ses = io_parms->tcon->ses;
3503
3504         *nbytes = 0;
3505         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3506         if (rc)
3507                 return rc;
3508
3509         if (smb3_encryption_required(io_parms->tcon))
3510                 flags |= CIFS_TRANSFORM_REQ;
3511
3512         iov[0].iov_base = (char *)req;
3513         iov[0].iov_len = total_len;
3514
3515         memset(&rqst, 0, sizeof(struct smb_rqst));
3516         rqst.rq_iov = iov;
3517         rqst.rq_nvec = 1;
3518
3519         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3520         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3521
3522         if (rc) {
3523                 if (rc != -ENODATA) {
3524                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3525                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3526                         trace_smb3_read_err(xid, req->PersistentFileId,
3527                                             io_parms->tcon->tid, ses->Suid,
3528                                             io_parms->offset, io_parms->length,
3529                                             rc);
3530                 } else
3531                         trace_smb3_read_done(xid, req->PersistentFileId,
3532                                     io_parms->tcon->tid, ses->Suid,
3533                                     io_parms->offset, 0);
3534                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3535                 cifs_small_buf_release(req);
3536                 return rc == -ENODATA ? 0 : rc;
3537         } else
3538                 trace_smb3_read_done(xid, req->PersistentFileId,
3539                                     io_parms->tcon->tid, ses->Suid,
3540                                     io_parms->offset, io_parms->length);
3541
3542         cifs_small_buf_release(req);
3543
3544         *nbytes = le32_to_cpu(rsp->DataLength);
3545         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3546             (*nbytes > io_parms->length)) {
3547                 cifs_dbg(FYI, "bad length %d for count %d\n",
3548                          *nbytes, io_parms->length);
3549                 rc = -EIO;
3550                 *nbytes = 0;
3551         }
3552
3553         if (*buf) {
3554                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3555                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3556         } else if (resp_buftype != CIFS_NO_BUFFER) {
3557                 *buf = rsp_iov.iov_base;
3558                 if (resp_buftype == CIFS_SMALL_BUFFER)
3559                         *buf_type = CIFS_SMALL_BUFFER;
3560                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3561                         *buf_type = CIFS_LARGE_BUFFER;
3562         }
3563         return rc;
3564 }
3565
3566 /*
3567  * Check the mid_state and signature on received buffer (if any), and queue the
3568  * workqueue completion task.
3569  */
3570 static void
3571 smb2_writev_callback(struct mid_q_entry *mid)
3572 {
3573         struct cifs_writedata *wdata = mid->callback_data;
3574         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3575         struct TCP_Server_Info *server = tcon->ses->server;
3576         unsigned int written;
3577         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3578         struct cifs_credits credits = { .value = 0, .instance = 0 };
3579
3580         switch (mid->mid_state) {
3581         case MID_RESPONSE_RECEIVED:
3582                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3583                 credits.instance = server->reconnect_instance;
3584                 wdata->result = smb2_check_receive(mid, server, 0);
3585                 if (wdata->result != 0)
3586                         break;
3587
3588                 written = le32_to_cpu(rsp->DataLength);
3589                 /*
3590                  * Mask off high 16 bits when bytes written as returned
3591                  * by the server is greater than bytes requested by the
3592                  * client. OS/2 servers are known to set incorrect
3593                  * CountHigh values.
3594                  */
3595                 if (written > wdata->bytes)
3596                         written &= 0xFFFF;
3597
3598                 if (written < wdata->bytes)
3599                         wdata->result = -ENOSPC;
3600                 else
3601                         wdata->bytes = written;
3602                 break;
3603         case MID_REQUEST_SUBMITTED:
3604         case MID_RETRY_NEEDED:
3605                 wdata->result = -EAGAIN;
3606                 break;
3607         case MID_RESPONSE_MALFORMED:
3608                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3609                 credits.instance = server->reconnect_instance;
3610                 /* fall through */
3611         default:
3612                 wdata->result = -EIO;
3613                 break;
3614         }
3615 #ifdef CONFIG_CIFS_SMB_DIRECT
3616         /*
3617          * If this wdata has a memory registered, the MR can be freed
3618          * The number of MRs available is limited, it's important to recover
3619          * used MR as soon as I/O is finished. Hold MR longer in the later
3620          * I/O process can possibly result in I/O deadlock due to lack of MR
3621          * to send request on I/O retry
3622          */
3623         if (wdata->mr) {
3624                 smbd_deregister_mr(wdata->mr);
3625                 wdata->mr = NULL;
3626         }
3627 #endif
3628         if (wdata->result) {
3629                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3630                 trace_smb3_write_err(0 /* no xid */,
3631                                      wdata->cfile->fid.persistent_fid,
3632                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3633                                      wdata->bytes, wdata->result);
3634         } else
3635                 trace_smb3_write_done(0 /* no xid */,
3636                                       wdata->cfile->fid.persistent_fid,
3637                                       tcon->tid, tcon->ses->Suid,
3638                                       wdata->offset, wdata->bytes);
3639
3640         queue_work(cifsiod_wq, &wdata->work);
3641         DeleteMidQEntry(mid);
3642         add_credits(server, &credits, 0);
3643 }
3644
3645 /* smb2_async_writev - send an async write, and set up mid to handle result */
3646 int
3647 smb2_async_writev(struct cifs_writedata *wdata,
3648                   void (*release)(struct kref *kref))
3649 {
3650         int rc = -EACCES, flags = 0;
3651         struct smb2_write_req *req = NULL;
3652         struct smb2_sync_hdr *shdr;
3653         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3654         struct TCP_Server_Info *server = tcon->ses->server;
3655         struct kvec iov[1];
3656         struct smb_rqst rqst = { };
3657         unsigned int total_len;
3658
3659         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3660         if (rc)
3661                 return rc;
3662
3663         if (smb3_encryption_required(tcon))
3664                 flags |= CIFS_TRANSFORM_REQ;
3665
3666         shdr = (struct smb2_sync_hdr *)req;
3667         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3668
3669         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3670         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3671         req->WriteChannelInfoOffset = 0;
3672         req->WriteChannelInfoLength = 0;
3673         req->Channel = 0;
3674         req->Offset = cpu_to_le64(wdata->offset);
3675         req->DataOffset = cpu_to_le16(
3676                                 offsetof(struct smb2_write_req, Buffer));
3677         req->RemainingBytes = 0;
3678
3679         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
3680                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
3681 #ifdef CONFIG_CIFS_SMB_DIRECT
3682         /*
3683          * If we want to do a server RDMA read, fill in and append
3684          * smbd_buffer_descriptor_v1 to the end of write request
3685          */
3686         if (server->rdma && !server->sign && wdata->bytes >=
3687                 server->smbd_conn->rdma_readwrite_threshold) {
3688
3689                 struct smbd_buffer_descriptor_v1 *v1;
3690                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3691
3692                 wdata->mr = smbd_register_mr(
3693                                 server->smbd_conn, wdata->pages,
3694                                 wdata->nr_pages, wdata->page_offset,
3695                                 wdata->tailsz, false, need_invalidate);
3696                 if (!wdata->mr) {
3697                         rc = -EAGAIN;
3698                         goto async_writev_out;
3699                 }
3700                 req->Length = 0;
3701                 req->DataOffset = 0;
3702                 if (wdata->nr_pages > 1)
3703                         req->RemainingBytes =
3704                                 cpu_to_le32(
3705                                         (wdata->nr_pages - 1) * wdata->pagesz -
3706                                         wdata->page_offset + wdata->tailsz
3707                                 );
3708                 else
3709                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3710                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3711                 if (need_invalidate)
3712                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3713                 req->WriteChannelInfoOffset =
3714                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3715                 req->WriteChannelInfoLength =
3716                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3717                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3718                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3719                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3720                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3721         }
3722 #endif
3723         iov[0].iov_len = total_len - 1;
3724         iov[0].iov_base = (char *)req;
3725
3726         rqst.rq_iov = iov;
3727         rqst.rq_nvec = 1;
3728         rqst.rq_pages = wdata->pages;
3729         rqst.rq_offset = wdata->page_offset;
3730         rqst.rq_npages = wdata->nr_pages;
3731         rqst.rq_pagesz = wdata->pagesz;
3732         rqst.rq_tailsz = wdata->tailsz;
3733 #ifdef CONFIG_CIFS_SMB_DIRECT
3734         if (wdata->mr) {
3735                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3736                 rqst.rq_npages = 0;
3737         }
3738 #endif
3739         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3740                  wdata->offset, wdata->bytes);
3741
3742 #ifdef CONFIG_CIFS_SMB_DIRECT
3743         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3744         if (!wdata->mr)
3745                 req->Length = cpu_to_le32(wdata->bytes);
3746 #else
3747         req->Length = cpu_to_le32(wdata->bytes);
3748 #endif
3749
3750         if (wdata->credits.value > 0) {
3751                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3752                                                     SMB2_MAX_BUFFER_SIZE));
3753                 shdr->CreditRequest =
3754                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3755
3756                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
3757                 if (rc)
3758                         goto async_writev_out;
3759
3760                 flags |= CIFS_HAS_CREDITS;
3761         }
3762
3763         kref_get(&wdata->refcount);
3764         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3765                              wdata, flags, &wdata->credits);
3766
3767         if (rc) {
3768                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3769                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3770                                      wdata->bytes, rc);
3771                 kref_put(&wdata->refcount, release);
3772                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3773         }
3774
3775 async_writev_out:
3776         cifs_small_buf_release(req);
3777         return rc;
3778 }
3779
3780 /*
3781  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3782  * The length field from io_parms must be at least 1 and indicates a number of
3783  * elements with data to write that begins with position 1 in iov array. All
3784  * data length is specified by count.
3785  */
3786 int
3787 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3788            unsigned int *nbytes, struct kvec *iov, int n_vec)
3789 {
3790         struct smb_rqst rqst;
3791         int rc = 0;
3792         struct smb2_write_req *req = NULL;
3793         struct smb2_write_rsp *rsp = NULL;
3794         int resp_buftype;
3795         struct kvec rsp_iov;
3796         int flags = 0;
3797         unsigned int total_len;
3798
3799         *nbytes = 0;
3800
3801         if (n_vec < 1)
3802                 return rc;
3803
3804         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3805                              &total_len);
3806         if (rc)
3807                 return rc;
3808
3809         if (io_parms->tcon->ses->server == NULL)
3810                 return -ECONNABORTED;
3811
3812         if (smb3_encryption_required(io_parms->tcon))
3813                 flags |= CIFS_TRANSFORM_REQ;
3814
3815         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3816
3817         req->PersistentFileId = io_parms->persistent_fid;
3818         req->VolatileFileId = io_parms->volatile_fid;
3819         req->WriteChannelInfoOffset = 0;
3820         req->WriteChannelInfoLength = 0;
3821         req->Channel = 0;
3822         req->Length = cpu_to_le32(io_parms->length);
3823         req->Offset = cpu_to_le64(io_parms->offset);
3824         req->DataOffset = cpu_to_le16(
3825                                 offsetof(struct smb2_write_req, Buffer));
3826         req->RemainingBytes = 0;
3827
3828         trace_smb3_write_enter(xid, io_parms->persistent_fid,
3829                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3830                 io_parms->offset, io_parms->length);
3831
3832         iov[0].iov_base = (char *)req;
3833         /* 1 for Buffer */
3834         iov[0].iov_len = total_len - 1;
3835
3836         memset(&rqst, 0, sizeof(struct smb_rqst));
3837         rqst.rq_iov = iov;
3838         rqst.rq_nvec = n_vec + 1;
3839
3840         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3841                             &resp_buftype, flags, &rsp_iov);
3842         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3843
3844         if (rc) {
3845                 trace_smb3_write_err(xid, req->PersistentFileId,
3846                                      io_parms->tcon->tid,
3847                                      io_parms->tcon->ses->Suid,
3848                                      io_parms->offset, io_parms->length, rc);
3849                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3850                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3851         } else {
3852                 *nbytes = le32_to_cpu(rsp->DataLength);
3853                 trace_smb3_write_done(xid, req->PersistentFileId,
3854                                      io_parms->tcon->tid,
3855                                      io_parms->tcon->ses->Suid,
3856                                      io_parms->offset, *nbytes);
3857         }
3858
3859         cifs_small_buf_release(req);
3860         free_rsp_buf(resp_buftype, rsp);
3861         return rc;
3862 }
3863
3864 static unsigned int
3865 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3866 {
3867         int len;
3868         unsigned int entrycount = 0;
3869         unsigned int next_offset = 0;
3870         char *entryptr;
3871         FILE_DIRECTORY_INFO *dir_info;
3872
3873         if (bufstart == NULL)
3874                 return 0;
3875
3876         entryptr = bufstart;
3877
3878         while (1) {
3879                 if (entryptr + next_offset < entryptr ||
3880                     entryptr + next_offset > end_of_buf ||
3881                     entryptr + next_offset + size > end_of_buf) {
3882                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3883                         break;
3884                 }
3885
3886                 entryptr = entryptr + next_offset;
3887                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3888
3889                 len = le32_to_cpu(dir_info->FileNameLength);
3890                 if (entryptr + len < entryptr ||
3891                     entryptr + len > end_of_buf ||
3892                     entryptr + len + size > end_of_buf) {
3893                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3894                                  end_of_buf);
3895                         break;
3896                 }
3897
3898                 *lastentry = entryptr;
3899                 entrycount++;
3900
3901                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3902                 if (!next_offset)
3903                         break;
3904         }
3905
3906         return entrycount;
3907 }
3908
3909 /*
3910  * Readdir/FindFirst
3911  */
3912 int
3913 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3914                      u64 persistent_fid, u64 volatile_fid, int index,
3915                      struct cifs_search_info *srch_inf)
3916 {
3917         struct smb_rqst rqst;
3918         struct smb2_query_directory_req *req;
3919         struct smb2_query_directory_rsp *rsp = NULL;
3920         struct kvec iov[2];
3921         struct kvec rsp_iov;
3922         int rc = 0;
3923         int len;
3924         int resp_buftype = CIFS_NO_BUFFER;
3925         unsigned char *bufptr;
3926         struct TCP_Server_Info *server;
3927         struct cifs_ses *ses = tcon->ses;
3928         __le16 asteriks = cpu_to_le16('*');
3929         char *end_of_smb;
3930         unsigned int output_size = CIFSMaxBufSize;
3931         size_t info_buf_size;
3932         int flags = 0;
3933         unsigned int total_len;
3934
3935         if (ses && (ses->server))
3936                 server = ses->server;
3937         else
3938                 return -EIO;
3939
3940         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3941                              &total_len);
3942         if (rc)
3943                 return rc;
3944
3945         if (smb3_encryption_required(tcon))
3946                 flags |= CIFS_TRANSFORM_REQ;
3947
3948         switch (srch_inf->info_level) {
3949         case SMB_FIND_FILE_DIRECTORY_INFO:
3950                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3951                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3952                 break;
3953         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3954                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3955                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3956                 break;
3957         default:
3958                 cifs_dbg(VFS, "info level %u isn't supported\n",
3959                          srch_inf->info_level);
3960                 rc = -EINVAL;
3961                 goto qdir_exit;
3962         }
3963
3964         req->FileIndex = cpu_to_le32(index);
3965         req->PersistentFileId = persistent_fid;
3966         req->VolatileFileId = volatile_fid;
3967
3968         len = 0x2;
3969         bufptr = req->Buffer;
3970         memcpy(bufptr, &asteriks, len);
3971
3972         req->FileNameOffset =
3973                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3974         req->FileNameLength = cpu_to_le16(len);
3975         /*
3976          * BB could be 30 bytes or so longer if we used SMB2 specific
3977          * buffer lengths, but this is safe and close enough.
3978          */
3979         output_size = min_t(unsigned int, output_size, server->maxBuf);
3980         output_size = min_t(unsigned int, output_size, 2 << 15);
3981         req->OutputBufferLength = cpu_to_le32(output_size);
3982
3983         iov[0].iov_base = (char *)req;
3984         /* 1 for Buffer */
3985         iov[0].iov_len = total_len - 1;
3986
3987         iov[1].iov_base = (char *)(req->Buffer);
3988         iov[1].iov_len = len;
3989
3990         memset(&rqst, 0, sizeof(struct smb_rqst));
3991         rqst.rq_iov = iov;
3992         rqst.rq_nvec = 2;
3993
3994         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
3995                         tcon->ses->Suid, index, output_size);
3996
3997         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3998         cifs_small_buf_release(req);
3999         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4000
4001         if (rc) {
4002                 if (rc == -ENODATA &&
4003                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4004                         trace_smb3_query_dir_done(xid, persistent_fid,
4005                                 tcon->tid, tcon->ses->Suid, index, 0);
4006                         srch_inf->endOfSearch = true;
4007                         rc = 0;
4008                 } else {
4009                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4010                                 tcon->ses->Suid, index, 0, rc);
4011                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4012                 }
4013                 goto qdir_exit;
4014         }
4015
4016         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4017                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4018                                info_buf_size);
4019         if (rc) {
4020                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4021                         tcon->ses->Suid, index, 0, rc);
4022                 goto qdir_exit;
4023         }
4024
4025         srch_inf->unicode = true;
4026
4027         if (srch_inf->ntwrk_buf_start) {
4028                 if (srch_inf->smallBuf)
4029                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4030                 else
4031                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4032         }
4033         srch_inf->ntwrk_buf_start = (char *)rsp;
4034         srch_inf->srch_entries_start = srch_inf->last_entry =
4035                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4036         end_of_smb = rsp_iov.iov_len + (char *)rsp;
4037         srch_inf->entries_in_buffer =
4038                         num_entries(srch_inf->srch_entries_start, end_of_smb,
4039                                     &srch_inf->last_entry, info_buf_size);
4040         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4041         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4042                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4043                  srch_inf->srch_entries_start, srch_inf->last_entry);
4044         if (resp_buftype == CIFS_LARGE_BUFFER)
4045                 srch_inf->smallBuf = false;
4046         else if (resp_buftype == CIFS_SMALL_BUFFER)
4047                 srch_inf->smallBuf = true;
4048         else
4049                 cifs_dbg(VFS, "illegal search buffer type\n");
4050
4051         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4052                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4053         return rc;
4054
4055 qdir_exit:
4056         free_rsp_buf(resp_buftype, rsp);
4057         return rc;
4058 }
4059
4060 int
4061 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
4062                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4063                u8 info_type, u32 additional_info,
4064                 void **data, unsigned int *size)
4065 {
4066         struct smb2_set_info_req *req;
4067         struct kvec *iov = rqst->rq_iov;
4068         unsigned int i, total_len;
4069         int rc;
4070
4071         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
4072         if (rc)
4073                 return rc;
4074
4075         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4076         req->InfoType = info_type;
4077         req->FileInfoClass = info_class;
4078         req->PersistentFileId = persistent_fid;
4079         req->VolatileFileId = volatile_fid;
4080         req->AdditionalInformation = cpu_to_le32(additional_info);
4081
4082         req->BufferOffset =
4083                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4084         req->BufferLength = cpu_to_le32(*size);
4085
4086         memcpy(req->Buffer, *data, *size);
4087         total_len += *size;
4088
4089         iov[0].iov_base = (char *)req;
4090         /* 1 for Buffer */
4091         iov[0].iov_len = total_len - 1;
4092
4093         for (i = 1; i < rqst->rq_nvec; i++) {
4094                 le32_add_cpu(&req->BufferLength, size[i]);
4095                 iov[i].iov_base = (char *)data[i];
4096                 iov[i].iov_len = size[i];
4097         }
4098
4099         return 0;
4100 }
4101
4102 void
4103 SMB2_set_info_free(struct smb_rqst *rqst)
4104 {
4105         if (rqst && rqst->rq_iov)
4106                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4107 }
4108
4109 static int
4110 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4111                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4112                u8 info_type, u32 additional_info, unsigned int num,
4113                 void **data, unsigned int *size)
4114 {
4115         struct smb_rqst rqst;
4116         struct smb2_set_info_rsp *rsp = NULL;
4117         struct kvec *iov;
4118         struct kvec rsp_iov;
4119         int rc = 0;
4120         int resp_buftype;
4121         struct cifs_ses *ses = tcon->ses;
4122         int flags = 0;
4123
4124         if (!ses || !(ses->server))
4125                 return -EIO;
4126
4127         if (!num)
4128                 return -EINVAL;
4129
4130         if (smb3_encryption_required(tcon))
4131                 flags |= CIFS_TRANSFORM_REQ;
4132
4133         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4134         if (!iov)
4135                 return -ENOMEM;
4136
4137         memset(&rqst, 0, sizeof(struct smb_rqst));
4138         rqst.rq_iov = iov;
4139         rqst.rq_nvec = num;
4140
4141         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4142                                 info_class, info_type, additional_info,
4143                                 data, size);
4144         if (rc) {
4145                 kfree(iov);
4146                 return rc;
4147         }
4148
4149
4150         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4151                             &rsp_iov);
4152         SMB2_set_info_free(&rqst);
4153         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4154
4155         if (rc != 0) {
4156                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4157                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4158                                 ses->Suid, info_class, (__u32)info_type, rc);
4159         }
4160
4161         free_rsp_buf(resp_buftype, rsp);
4162         kfree(iov);
4163         return rc;
4164 }
4165
4166 int
4167 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4168              u64 volatile_fid, u32 pid, __le64 *eof)
4169 {
4170         struct smb2_file_eof_info info;
4171         void *data;
4172         unsigned int size;
4173
4174         info.EndOfFile = *eof;
4175
4176         data = &info;
4177         size = sizeof(struct smb2_file_eof_info);
4178
4179         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4180                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4181                         0, 1, &data, &size);
4182 }
4183
4184 int
4185 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4186                 u64 persistent_fid, u64 volatile_fid,
4187                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4188 {
4189         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4190                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4191                         1, (void **)&pnntsd, &pacllen);
4192 }
4193
4194 int
4195 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4196             u64 persistent_fid, u64 volatile_fid,
4197             struct smb2_file_full_ea_info *buf, int len)
4198 {
4199         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4200                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4201                 0, 1, (void **)&buf, &len);
4202 }
4203
4204 int
4205 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4206                   const u64 persistent_fid, const u64 volatile_fid,
4207                   __u8 oplock_level)
4208 {
4209         struct smb_rqst rqst;
4210         int rc;
4211         struct smb2_oplock_break *req = NULL;
4212         struct cifs_ses *ses = tcon->ses;
4213         int flags = CIFS_OBREAK_OP;
4214         unsigned int total_len;
4215         struct kvec iov[1];
4216         struct kvec rsp_iov;
4217         int resp_buf_type;
4218
4219         cifs_dbg(FYI, "SMB2_oplock_break\n");
4220         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4221                              &total_len);
4222         if (rc)
4223                 return rc;
4224
4225         if (smb3_encryption_required(tcon))
4226                 flags |= CIFS_TRANSFORM_REQ;
4227
4228         req->VolatileFid = volatile_fid;
4229         req->PersistentFid = persistent_fid;
4230         req->OplockLevel = oplock_level;
4231         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4232
4233         flags |= CIFS_NO_RSP_BUF;
4234
4235         iov[0].iov_base = (char *)req;
4236         iov[0].iov_len = total_len;
4237
4238         memset(&rqst, 0, sizeof(struct smb_rqst));
4239         rqst.rq_iov = iov;
4240         rqst.rq_nvec = 1;
4241
4242         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4243         cifs_small_buf_release(req);
4244
4245         if (rc) {
4246                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4247                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4248         }
4249
4250         return rc;
4251 }
4252
4253 void
4254 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4255                              struct kstatfs *kst)
4256 {
4257         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4258                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4259         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4260         kst->f_bfree  = kst->f_bavail =
4261                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4262         return;
4263 }
4264
4265 static void
4266 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4267                         struct kstatfs *kst)
4268 {
4269         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4270         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4271         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4272         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4273                 kst->f_bavail = kst->f_bfree;
4274         else
4275                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4276         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4277                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4278         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4279                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4280
4281         return;
4282 }
4283
4284 static int
4285 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4286                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4287 {
4288         int rc;
4289         struct smb2_query_info_req *req;
4290         unsigned int total_len;
4291
4292         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4293
4294         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4295                 return -EIO;
4296
4297         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4298                              &total_len);
4299         if (rc)
4300                 return rc;
4301
4302         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4303         req->FileInfoClass = level;
4304         req->PersistentFileId = persistent_fid;
4305         req->VolatileFileId = volatile_fid;
4306         /* 1 for pad */
4307         req->InputBufferOffset =
4308                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4309         req->OutputBufferLength = cpu_to_le32(
4310                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4311
4312         iov->iov_base = (char *)req;
4313         iov->iov_len = total_len;
4314         return 0;
4315 }
4316
4317 int
4318 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4319               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4320 {
4321         struct smb_rqst rqst;
4322         struct smb2_query_info_rsp *rsp = NULL;
4323         struct kvec iov;
4324         struct kvec rsp_iov;
4325         int rc = 0;
4326         int resp_buftype;
4327         struct cifs_ses *ses = tcon->ses;
4328         FILE_SYSTEM_POSIX_INFO *info = NULL;
4329         int flags = 0;
4330
4331         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4332                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4333                                 persistent_fid, volatile_fid);
4334         if (rc)
4335                 return rc;
4336
4337         if (smb3_encryption_required(tcon))
4338                 flags |= CIFS_TRANSFORM_REQ;
4339
4340         memset(&rqst, 0, sizeof(struct smb_rqst));
4341         rqst.rq_iov = &iov;
4342         rqst.rq_nvec = 1;
4343
4344         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4345         cifs_small_buf_release(iov.iov_base);
4346         if (rc) {
4347                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4348                 goto posix_qfsinf_exit;
4349         }
4350         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4351
4352         info = (FILE_SYSTEM_POSIX_INFO *)(
4353                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4354         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4355                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4356                                sizeof(FILE_SYSTEM_POSIX_INFO));
4357         if (!rc)
4358                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4359
4360 posix_qfsinf_exit:
4361         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4362         return rc;
4363 }
4364
4365 int
4366 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4367               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4368 {
4369         struct smb_rqst rqst;
4370         struct smb2_query_info_rsp *rsp = NULL;
4371         struct kvec iov;
4372         struct kvec rsp_iov;
4373         int rc = 0;
4374         int resp_buftype;
4375         struct cifs_ses *ses = tcon->ses;
4376         struct smb2_fs_full_size_info *info = NULL;
4377         int flags = 0;
4378
4379         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4380                                 sizeof(struct smb2_fs_full_size_info),
4381                                 persistent_fid, volatile_fid);
4382         if (rc)
4383                 return rc;
4384
4385         if (smb3_encryption_required(tcon))
4386                 flags |= CIFS_TRANSFORM_REQ;
4387
4388         memset(&rqst, 0, sizeof(struct smb_rqst));
4389         rqst.rq_iov = &iov;
4390         rqst.rq_nvec = 1;
4391
4392         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4393         cifs_small_buf_release(iov.iov_base);
4394         if (rc) {
4395                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4396                 goto qfsinf_exit;
4397         }
4398         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4399
4400         info = (struct smb2_fs_full_size_info *)(
4401                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4402         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4403                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4404                                sizeof(struct smb2_fs_full_size_info));
4405         if (!rc)
4406                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4407
4408 qfsinf_exit:
4409         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4410         return rc;
4411 }
4412
4413 int
4414 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4415               u64 persistent_fid, u64 volatile_fid, int level)
4416 {
4417         struct smb_rqst rqst;
4418         struct smb2_query_info_rsp *rsp = NULL;
4419         struct kvec iov;
4420         struct kvec rsp_iov;
4421         int rc = 0;
4422         int resp_buftype, max_len, min_len;
4423         struct cifs_ses *ses = tcon->ses;
4424         unsigned int rsp_len, offset;
4425         int flags = 0;
4426
4427         if (level == FS_DEVICE_INFORMATION) {
4428                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4429                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4430         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4431                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4432                 min_len = MIN_FS_ATTR_INFO_SIZE;
4433         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4434                 max_len = sizeof(struct smb3_fs_ss_info);
4435                 min_len = sizeof(struct smb3_fs_ss_info);
4436         } else if (level == FS_VOLUME_INFORMATION) {
4437                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4438                 min_len = sizeof(struct smb3_fs_vol_info);
4439         } else {
4440                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4441                 return -EINVAL;
4442         }
4443
4444         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4445                                 persistent_fid, volatile_fid);
4446         if (rc)
4447                 return rc;
4448
4449         if (smb3_encryption_required(tcon))
4450                 flags |= CIFS_TRANSFORM_REQ;
4451
4452         memset(&rqst, 0, sizeof(struct smb_rqst));
4453         rqst.rq_iov = &iov;
4454         rqst.rq_nvec = 1;
4455
4456         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4457         cifs_small_buf_release(iov.iov_base);
4458         if (rc) {
4459                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4460                 goto qfsattr_exit;
4461         }
4462         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4463
4464         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4465         offset = le16_to_cpu(rsp->OutputBufferOffset);
4466         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4467         if (rc)
4468                 goto qfsattr_exit;
4469
4470         if (level == FS_ATTRIBUTE_INFORMATION)
4471                 memcpy(&tcon->fsAttrInfo, offset
4472                         + (char *)rsp, min_t(unsigned int,
4473                         rsp_len, max_len));
4474         else if (level == FS_DEVICE_INFORMATION)
4475                 memcpy(&tcon->fsDevInfo, offset
4476                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4477         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4478                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4479                         (offset + (char *)rsp);
4480                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4481                 tcon->perf_sector_size =
4482                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4483         } else if (level == FS_VOLUME_INFORMATION) {
4484                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4485                         (offset + (char *)rsp);
4486                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4487                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4488         }
4489
4490 qfsattr_exit:
4491         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4492         return rc;
4493 }
4494
4495 int
4496 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4497            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4498            const __u32 num_lock, struct smb2_lock_element *buf)
4499 {
4500         struct smb_rqst rqst;
4501         int rc = 0;
4502         struct smb2_lock_req *req = NULL;
4503         struct kvec iov[2];
4504         struct kvec rsp_iov;
4505         int resp_buf_type;
4506         unsigned int count;
4507         int flags = CIFS_NO_RSP_BUF;
4508         unsigned int total_len;
4509
4510         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4511
4512         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4513         if (rc)
4514                 return rc;
4515
4516         if (smb3_encryption_required(tcon))
4517                 flags |= CIFS_TRANSFORM_REQ;
4518
4519         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4520         req->LockCount = cpu_to_le16(num_lock);
4521
4522         req->PersistentFileId = persist_fid;
4523         req->VolatileFileId = volatile_fid;
4524
4525         count = num_lock * sizeof(struct smb2_lock_element);
4526
4527         iov[0].iov_base = (char *)req;
4528         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4529         iov[1].iov_base = (char *)buf;
4530         iov[1].iov_len = count;
4531
4532         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4533
4534         memset(&rqst, 0, sizeof(struct smb_rqst));
4535         rqst.rq_iov = iov;
4536         rqst.rq_nvec = 2;
4537
4538         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4539                             &rsp_iov);
4540         cifs_small_buf_release(req);
4541         if (rc) {
4542                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4543                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4544                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4545                                     tcon->ses->Suid, rc);
4546         }
4547
4548         return rc;
4549 }
4550
4551 int
4552 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4553           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4554           const __u64 length, const __u64 offset, const __u32 lock_flags,
4555           const bool wait)
4556 {
4557         struct smb2_lock_element lock;
4558
4559         lock.Offset = cpu_to_le64(offset);
4560         lock.Length = cpu_to_le64(length);
4561         lock.Flags = cpu_to_le32(lock_flags);
4562         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4563                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4564
4565         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4566 }
4567
4568 int
4569 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4570                  __u8 *lease_key, const __le32 lease_state)
4571 {
4572         struct smb_rqst rqst;
4573         int rc;
4574         struct smb2_lease_ack *req = NULL;
4575         struct cifs_ses *ses = tcon->ses;
4576         int flags = CIFS_OBREAK_OP;
4577         unsigned int total_len;
4578         struct kvec iov[1];
4579         struct kvec rsp_iov;
4580         int resp_buf_type;
4581         __u64 *please_key_high;
4582         __u64 *please_key_low;
4583
4584         cifs_dbg(FYI, "SMB2_lease_break\n");
4585         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4586                              &total_len);
4587         if (rc)
4588                 return rc;
4589
4590         if (smb3_encryption_required(tcon))
4591                 flags |= CIFS_TRANSFORM_REQ;
4592
4593         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4594         req->StructureSize = cpu_to_le16(36);
4595         total_len += 12;
4596
4597         memcpy(req->LeaseKey, lease_key, 16);
4598         req->LeaseState = lease_state;
4599
4600         flags |= CIFS_NO_RSP_BUF;
4601
4602         iov[0].iov_base = (char *)req;
4603         iov[0].iov_len = total_len;
4604
4605         memset(&rqst, 0, sizeof(struct smb_rqst));
4606         rqst.rq_iov = iov;
4607         rqst.rq_nvec = 1;
4608
4609         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4610         cifs_small_buf_release(req);
4611
4612         please_key_low = (__u64 *)lease_key;
4613         please_key_high = (__u64 *)(lease_key+8);
4614         if (rc) {
4615                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4616                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4617                         ses->Suid, *please_key_low, *please_key_high, rc);
4618                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4619         } else
4620                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4621                         ses->Suid, *please_key_low, *please_key_high);
4622
4623         return rc;
4624 }