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 (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 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                 return 0;
1058         } else if (rc != 0) {
1059                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1060                 rc = -EIO;
1061                 goto out_free_inbuf;
1062         }
1063
1064         rc = -EIO;
1065         if (rsplen != sizeof(*pneg_rsp)) {
1066                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1067                          rsplen);
1068
1069                 /* relax check since Mac returns max bufsize allowed on ioctl */
1070                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1071                         goto out_free_rsp;
1072         }
1073
1074         /* check validate negotiate info response matches what we got earlier */
1075         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
1076                 goto vneg_out;
1077
1078         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
1079                 goto vneg_out;
1080
1081         /* do not validate server guid because not saved at negprot time yet */
1082
1083         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1084               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
1085                 goto vneg_out;
1086
1087         /* validate negotiate successful */
1088         rc = 0;
1089         cifs_dbg(FYI, "validate negotiate info successful\n");
1090         goto out_free_rsp;
1091
1092 vneg_out:
1093         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1094 out_free_rsp:
1095         kfree(pneg_rsp);
1096 out_free_inbuf:
1097         kfree(pneg_inbuf);
1098         return rc;
1099 }
1100
1101 enum securityEnum
1102 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1103 {
1104         switch (requested) {
1105         case Kerberos:
1106         case RawNTLMSSP:
1107                 return requested;
1108         case NTLMv2:
1109                 return RawNTLMSSP;
1110         case Unspecified:
1111                 if (server->sec_ntlmssp &&
1112                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1113                         return RawNTLMSSP;
1114                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1115                         (global_secflags & CIFSSEC_MAY_KRB5))
1116                         return Kerberos;
1117                 /* Fallthrough */
1118         default:
1119                 return Unspecified;
1120         }
1121 }
1122
1123 struct SMB2_sess_data {
1124         unsigned int xid;
1125         struct cifs_ses *ses;
1126         struct nls_table *nls_cp;
1127         void (*func)(struct SMB2_sess_data *);
1128         int result;
1129         u64 previous_session;
1130
1131         /* we will send the SMB in three pieces:
1132          * a fixed length beginning part, an optional
1133          * SPNEGO blob (which can be zero length), and a
1134          * last part which will include the strings
1135          * and rest of bcc area. This allows us to avoid
1136          * a large buffer 17K allocation
1137          */
1138         int buf0_type;
1139         struct kvec iov[2];
1140 };
1141
1142 static int
1143 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1144 {
1145         int rc;
1146         struct cifs_ses *ses = sess_data->ses;
1147         struct smb2_sess_setup_req *req;
1148         struct TCP_Server_Info *server = ses->server;
1149         unsigned int total_len;
1150
1151         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1152                              &total_len);
1153         if (rc)
1154                 return rc;
1155
1156         /* First session, not a reauthenticate */
1157         req->sync_hdr.SessionId = 0;
1158
1159         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1160         req->PreviousSessionId = sess_data->previous_session;
1161
1162         req->Flags = 0; /* MBZ */
1163
1164         /* enough to enable echos and oplocks and one max size write */
1165         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1166
1167         /* only one of SMB2 signing flags may be set in SMB2 request */
1168         if (server->sign)
1169                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1170         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1171                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1172         else
1173                 req->SecurityMode = 0;
1174
1175         req->Capabilities = 0;
1176         req->Channel = 0; /* MBZ */
1177
1178         sess_data->iov[0].iov_base = (char *)req;
1179         /* 1 for pad */
1180         sess_data->iov[0].iov_len = total_len - 1;
1181         /*
1182          * This variable will be used to clear the buffer
1183          * allocated above in case of any error in the calling function.
1184          */
1185         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1186
1187         return 0;
1188 }
1189
1190 static void
1191 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1192 {
1193         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1194         sess_data->buf0_type = CIFS_NO_BUFFER;
1195 }
1196
1197 static int
1198 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1199 {
1200         int rc;
1201         struct smb_rqst rqst;
1202         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1203         struct kvec rsp_iov = { NULL, 0 };
1204
1205         /* Testing shows that buffer offset must be at location of Buffer[0] */
1206         req->SecurityBufferOffset =
1207                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1208         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1209
1210         memset(&rqst, 0, sizeof(struct smb_rqst));
1211         rqst.rq_iov = sess_data->iov;
1212         rqst.rq_nvec = 2;
1213
1214         /* BB add code to build os and lm fields */
1215         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1216                             &rqst,
1217                             &sess_data->buf0_type,
1218                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1219         cifs_small_buf_release(sess_data->iov[0].iov_base);
1220         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1221
1222         return rc;
1223 }
1224
1225 static int
1226 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1227 {
1228         int rc = 0;
1229         struct cifs_ses *ses = sess_data->ses;
1230
1231         mutex_lock(&ses->server->srv_mutex);
1232         if (ses->server->ops->generate_signingkey) {
1233                 rc = ses->server->ops->generate_signingkey(ses);
1234                 if (rc) {
1235                         cifs_dbg(FYI,
1236                                 "SMB3 session key generation failed\n");
1237                         mutex_unlock(&ses->server->srv_mutex);
1238                         return rc;
1239                 }
1240         }
1241         if (!ses->server->session_estab) {
1242                 ses->server->sequence_number = 0x2;
1243                 ses->server->session_estab = true;
1244         }
1245         mutex_unlock(&ses->server->srv_mutex);
1246
1247         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1248         spin_lock(&GlobalMid_Lock);
1249         ses->status = CifsGood;
1250         ses->need_reconnect = false;
1251         spin_unlock(&GlobalMid_Lock);
1252         return rc;
1253 }
1254
1255 #ifdef CONFIG_CIFS_UPCALL
1256 static void
1257 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1258 {
1259         int rc;
1260         struct cifs_ses *ses = sess_data->ses;
1261         struct cifs_spnego_msg *msg;
1262         struct key *spnego_key = NULL;
1263         struct smb2_sess_setup_rsp *rsp = NULL;
1264
1265         rc = SMB2_sess_alloc_buffer(sess_data);
1266         if (rc)
1267                 goto out;
1268
1269         spnego_key = cifs_get_spnego_key(ses);
1270         if (IS_ERR(spnego_key)) {
1271                 rc = PTR_ERR(spnego_key);
1272                 spnego_key = NULL;
1273                 goto out;
1274         }
1275
1276         msg = spnego_key->payload.data[0];
1277         /*
1278          * check version field to make sure that cifs.upcall is
1279          * sending us a response in an expected form
1280          */
1281         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1282                 cifs_dbg(VFS,
1283                           "bad cifs.upcall version. Expected %d got %d",
1284                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1285                 rc = -EKEYREJECTED;
1286                 goto out_put_spnego_key;
1287         }
1288
1289         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1290                                          GFP_KERNEL);
1291         if (!ses->auth_key.response) {
1292                 cifs_dbg(VFS,
1293                         "Kerberos can't allocate (%u bytes) memory",
1294                         msg->sesskey_len);
1295                 rc = -ENOMEM;
1296                 goto out_put_spnego_key;
1297         }
1298         ses->auth_key.len = msg->sesskey_len;
1299
1300         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1301         sess_data->iov[1].iov_len = msg->secblob_len;
1302
1303         rc = SMB2_sess_sendreceive(sess_data);
1304         if (rc)
1305                 goto out_put_spnego_key;
1306
1307         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1308         ses->Suid = rsp->sync_hdr.SessionId;
1309
1310         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1311
1312         rc = SMB2_sess_establish_session(sess_data);
1313 out_put_spnego_key:
1314         key_invalidate(spnego_key);
1315         key_put(spnego_key);
1316 out:
1317         sess_data->result = rc;
1318         sess_data->func = NULL;
1319         SMB2_sess_free_buffer(sess_data);
1320 }
1321 #else
1322 static void
1323 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1324 {
1325         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1326         sess_data->result = -EOPNOTSUPP;
1327         sess_data->func = NULL;
1328 }
1329 #endif
1330
1331 static void
1332 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1333
1334 static void
1335 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1336 {
1337         int rc;
1338         struct cifs_ses *ses = sess_data->ses;
1339         struct smb2_sess_setup_rsp *rsp = NULL;
1340         char *ntlmssp_blob = NULL;
1341         bool use_spnego = false; /* else use raw ntlmssp */
1342         u16 blob_length = 0;
1343
1344         /*
1345          * If memory allocation is successful, caller of this function
1346          * frees it.
1347          */
1348         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1349         if (!ses->ntlmssp) {
1350                 rc = -ENOMEM;
1351                 goto out_err;
1352         }
1353         ses->ntlmssp->sesskey_per_smbsess = true;
1354
1355         rc = SMB2_sess_alloc_buffer(sess_data);
1356         if (rc)
1357                 goto out_err;
1358
1359         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1360                                GFP_KERNEL);
1361         if (ntlmssp_blob == NULL) {
1362                 rc = -ENOMEM;
1363                 goto out;
1364         }
1365
1366         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1367         if (use_spnego) {
1368                 /* BB eventually need to add this */
1369                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1370                 rc = -EOPNOTSUPP;
1371                 goto out;
1372         } else {
1373                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1374                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1375         }
1376         sess_data->iov[1].iov_base = ntlmssp_blob;
1377         sess_data->iov[1].iov_len = blob_length;
1378
1379         rc = SMB2_sess_sendreceive(sess_data);
1380         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1381
1382         /* If true, rc here is expected and not an error */
1383         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1384                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1385                 rc = 0;
1386
1387         if (rc)
1388                 goto out;
1389
1390         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1391                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1392                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1393                         le16_to_cpu(rsp->SecurityBufferOffset));
1394                 rc = -EIO;
1395                 goto out;
1396         }
1397         rc = decode_ntlmssp_challenge(rsp->Buffer,
1398                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1399         if (rc)
1400                 goto out;
1401
1402         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1403
1404
1405         ses->Suid = rsp->sync_hdr.SessionId;
1406         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1407
1408 out:
1409         kfree(ntlmssp_blob);
1410         SMB2_sess_free_buffer(sess_data);
1411         if (!rc) {
1412                 sess_data->result = 0;
1413                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1414                 return;
1415         }
1416 out_err:
1417         kfree(ses->ntlmssp);
1418         ses->ntlmssp = NULL;
1419         sess_data->result = rc;
1420         sess_data->func = NULL;
1421 }
1422
1423 static void
1424 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1425 {
1426         int rc;
1427         struct cifs_ses *ses = sess_data->ses;
1428         struct smb2_sess_setup_req *req;
1429         struct smb2_sess_setup_rsp *rsp = NULL;
1430         unsigned char *ntlmssp_blob = NULL;
1431         bool use_spnego = false; /* else use raw ntlmssp */
1432         u16 blob_length = 0;
1433
1434         rc = SMB2_sess_alloc_buffer(sess_data);
1435         if (rc)
1436                 goto out;
1437
1438         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1439         req->sync_hdr.SessionId = ses->Suid;
1440
1441         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1442                                         sess_data->nls_cp);
1443         if (rc) {
1444                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1445                 goto out;
1446         }
1447
1448         if (use_spnego) {
1449                 /* BB eventually need to add this */
1450                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1451                 rc = -EOPNOTSUPP;
1452                 goto out;
1453         }
1454         sess_data->iov[1].iov_base = ntlmssp_blob;
1455         sess_data->iov[1].iov_len = blob_length;
1456
1457         rc = SMB2_sess_sendreceive(sess_data);
1458         if (rc)
1459                 goto out;
1460
1461         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1462
1463         ses->Suid = rsp->sync_hdr.SessionId;
1464         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1465
1466         rc = SMB2_sess_establish_session(sess_data);
1467 out:
1468         kfree(ntlmssp_blob);
1469         SMB2_sess_free_buffer(sess_data);
1470         kfree(ses->ntlmssp);
1471         ses->ntlmssp = NULL;
1472         sess_data->result = rc;
1473         sess_data->func = NULL;
1474 }
1475
1476 static int
1477 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1478 {
1479         int type;
1480
1481         type = smb2_select_sectype(ses->server, ses->sectype);
1482         cifs_dbg(FYI, "sess setup type %d\n", type);
1483         if (type == Unspecified) {
1484                 cifs_dbg(VFS,
1485                         "Unable to select appropriate authentication method!");
1486                 return -EINVAL;
1487         }
1488
1489         switch (type) {
1490         case Kerberos:
1491                 sess_data->func = SMB2_auth_kerberos;
1492                 break;
1493         case RawNTLMSSP:
1494                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1495                 break;
1496         default:
1497                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1498                 return -EOPNOTSUPP;
1499         }
1500
1501         return 0;
1502 }
1503
1504 int
1505 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1506                 const struct nls_table *nls_cp)
1507 {
1508         int rc = 0;
1509         struct TCP_Server_Info *server = ses->server;
1510         struct SMB2_sess_data *sess_data;
1511
1512         cifs_dbg(FYI, "Session Setup\n");
1513
1514         if (!server) {
1515                 WARN(1, "%s: server is NULL!\n", __func__);
1516                 return -EIO;
1517         }
1518
1519         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1520         if (!sess_data)
1521                 return -ENOMEM;
1522
1523         rc = SMB2_select_sec(ses, sess_data);
1524         if (rc)
1525                 goto out;
1526         sess_data->xid = xid;
1527         sess_data->ses = ses;
1528         sess_data->buf0_type = CIFS_NO_BUFFER;
1529         sess_data->nls_cp = (struct nls_table *) nls_cp;
1530         sess_data->previous_session = ses->Suid;
1531
1532         /*
1533          * Initialize the session hash with the server one.
1534          */
1535         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1536                SMB2_PREAUTH_HASH_SIZE);
1537
1538         while (sess_data->func)
1539                 sess_data->func(sess_data);
1540
1541         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1542                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1543         rc = sess_data->result;
1544 out:
1545         kfree(sess_data);
1546         return rc;
1547 }
1548
1549 int
1550 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1551 {
1552         struct smb_rqst rqst;
1553         struct smb2_logoff_req *req; /* response is also trivial struct */
1554         int rc = 0;
1555         struct TCP_Server_Info *server;
1556         int flags = 0;
1557         unsigned int total_len;
1558         struct kvec iov[1];
1559         struct kvec rsp_iov;
1560         int resp_buf_type;
1561
1562         cifs_dbg(FYI, "disconnect session %p\n", ses);
1563
1564         if (ses && (ses->server))
1565                 server = ses->server;
1566         else
1567                 return -EIO;
1568
1569         /* no need to send SMB logoff if uid already closed due to reconnect */
1570         if (ses->need_reconnect)
1571                 goto smb2_session_already_dead;
1572
1573         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1574         if (rc)
1575                 return rc;
1576
1577          /* since no tcon, smb2_init can not do this, so do here */
1578         req->sync_hdr.SessionId = ses->Suid;
1579
1580         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1581                 flags |= CIFS_TRANSFORM_REQ;
1582         else if (server->sign)
1583                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1584
1585         flags |= CIFS_NO_RSP_BUF;
1586
1587         iov[0].iov_base = (char *)req;
1588         iov[0].iov_len = total_len;
1589
1590         memset(&rqst, 0, sizeof(struct smb_rqst));
1591         rqst.rq_iov = iov;
1592         rqst.rq_nvec = 1;
1593
1594         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1595         cifs_small_buf_release(req);
1596         /*
1597          * No tcon so can't do
1598          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1599          */
1600
1601 smb2_session_already_dead:
1602         return rc;
1603 }
1604
1605 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1606 {
1607         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1608 }
1609
1610 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1611
1612 /* These are similar values to what Windows uses */
1613 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1614 {
1615         tcon->max_chunks = 256;
1616         tcon->max_bytes_chunk = 1048576;
1617         tcon->max_bytes_copy = 16777216;
1618 }
1619
1620 int
1621 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1622           struct cifs_tcon *tcon, const struct nls_table *cp)
1623 {
1624         struct smb_rqst rqst;
1625         struct smb2_tree_connect_req *req;
1626         struct smb2_tree_connect_rsp *rsp = NULL;
1627         struct kvec iov[2];
1628         struct kvec rsp_iov = { NULL, 0 };
1629         int rc = 0;
1630         int resp_buftype;
1631         int unc_path_len;
1632         __le16 *unc_path = NULL;
1633         int flags = 0;
1634         unsigned int total_len;
1635
1636         cifs_dbg(FYI, "TCON\n");
1637
1638         if (!(ses->server) || !tree)
1639                 return -EIO;
1640
1641         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1642         if (unc_path == NULL)
1643                 return -ENOMEM;
1644
1645         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1646         unc_path_len *= 2;
1647         if (unc_path_len < 2) {
1648                 kfree(unc_path);
1649                 return -EINVAL;
1650         }
1651
1652         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1653         tcon->tid = 0;
1654         atomic_set(&tcon->num_remote_opens, 0);
1655         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1656                              &total_len);
1657         if (rc) {
1658                 kfree(unc_path);
1659                 return rc;
1660         }
1661
1662         if (smb3_encryption_required(tcon))
1663                 flags |= CIFS_TRANSFORM_REQ;
1664
1665         iov[0].iov_base = (char *)req;
1666         /* 1 for pad */
1667         iov[0].iov_len = total_len - 1;
1668
1669         /* Testing shows that buffer offset must be at location of Buffer[0] */
1670         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1671                         - 1 /* pad */);
1672         req->PathLength = cpu_to_le16(unc_path_len - 2);
1673         iov[1].iov_base = unc_path;
1674         iov[1].iov_len = unc_path_len;
1675
1676         /*
1677          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1678          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1679          * (Samba servers don't always set the flag so also check if null user)
1680          */
1681         if ((ses->server->dialect == SMB311_PROT_ID) &&
1682             !smb3_encryption_required(tcon) &&
1683             !(ses->session_flags &
1684                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1685             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1686                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1687
1688         memset(&rqst, 0, sizeof(struct smb_rqst));
1689         rqst.rq_iov = iov;
1690         rqst.rq_nvec = 2;
1691
1692         /* Need 64 for max size write so ask for more in case not there yet */
1693         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1694
1695         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1696         cifs_small_buf_release(req);
1697         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1698         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1699         if (rc != 0) {
1700                 if (tcon) {
1701                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1702                         tcon->need_reconnect = true;
1703                 }
1704                 goto tcon_error_exit;
1705         }
1706
1707         switch (rsp->ShareType) {
1708         case SMB2_SHARE_TYPE_DISK:
1709                 cifs_dbg(FYI, "connection to disk share\n");
1710                 break;
1711         case SMB2_SHARE_TYPE_PIPE:
1712                 tcon->pipe = true;
1713                 cifs_dbg(FYI, "connection to pipe share\n");
1714                 break;
1715         case SMB2_SHARE_TYPE_PRINT:
1716                 tcon->print = true;
1717                 cifs_dbg(FYI, "connection to printer\n");
1718                 break;
1719         default:
1720                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1721                 rc = -EOPNOTSUPP;
1722                 goto tcon_error_exit;
1723         }
1724
1725         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1726         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1727         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1728         tcon->tidStatus = CifsGood;
1729         tcon->need_reconnect = false;
1730         tcon->tid = rsp->sync_hdr.TreeId;
1731         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1732
1733         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1734             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1735                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1736
1737         if (tcon->seal &&
1738             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1739                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1740
1741         init_copy_chunk_defaults(tcon);
1742         if (tcon->ses->server->ops->validate_negotiate)
1743                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1744 tcon_exit:
1745
1746         free_rsp_buf(resp_buftype, rsp);
1747         kfree(unc_path);
1748         return rc;
1749
1750 tcon_error_exit:
1751         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1752                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1753         }
1754         goto tcon_exit;
1755 }
1756
1757 int
1758 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1759 {
1760         struct smb_rqst rqst;
1761         struct smb2_tree_disconnect_req *req; /* response is trivial */
1762         int rc = 0;
1763         struct cifs_ses *ses = tcon->ses;
1764         int flags = 0;
1765         unsigned int total_len;
1766         struct kvec iov[1];
1767         struct kvec rsp_iov;
1768         int resp_buf_type;
1769
1770         cifs_dbg(FYI, "Tree Disconnect\n");
1771
1772         if (!ses || !(ses->server))
1773                 return -EIO;
1774
1775         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1776                 return 0;
1777
1778         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1779                              &total_len);
1780         if (rc)
1781                 return rc;
1782
1783         if (smb3_encryption_required(tcon))
1784                 flags |= CIFS_TRANSFORM_REQ;
1785
1786         flags |= CIFS_NO_RSP_BUF;
1787
1788         iov[0].iov_base = (char *)req;
1789         iov[0].iov_len = total_len;
1790
1791         memset(&rqst, 0, sizeof(struct smb_rqst));
1792         rqst.rq_iov = iov;
1793         rqst.rq_nvec = 1;
1794
1795         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1796         cifs_small_buf_release(req);
1797         if (rc)
1798                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1799
1800         return rc;
1801 }
1802
1803
1804 static struct create_durable *
1805 create_durable_buf(void)
1806 {
1807         struct create_durable *buf;
1808
1809         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1810         if (!buf)
1811                 return NULL;
1812
1813         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1814                                         (struct create_durable, Data));
1815         buf->ccontext.DataLength = cpu_to_le32(16);
1816         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1817                                 (struct create_durable, Name));
1818         buf->ccontext.NameLength = cpu_to_le16(4);
1819         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1820         buf->Name[0] = 'D';
1821         buf->Name[1] = 'H';
1822         buf->Name[2] = 'n';
1823         buf->Name[3] = 'Q';
1824         return buf;
1825 }
1826
1827 static struct create_durable *
1828 create_reconnect_durable_buf(struct cifs_fid *fid)
1829 {
1830         struct create_durable *buf;
1831
1832         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1833         if (!buf)
1834                 return NULL;
1835
1836         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1837                                         (struct create_durable, Data));
1838         buf->ccontext.DataLength = cpu_to_le32(16);
1839         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1840                                 (struct create_durable, Name));
1841         buf->ccontext.NameLength = cpu_to_le16(4);
1842         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1843         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1844         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1845         buf->Name[0] = 'D';
1846         buf->Name[1] = 'H';
1847         buf->Name[2] = 'n';
1848         buf->Name[3] = 'C';
1849         return buf;
1850 }
1851
1852 __u8
1853 smb2_parse_lease_state(struct TCP_Server_Info *server,
1854                        struct smb2_create_rsp *rsp,
1855                        unsigned int *epoch, char *lease_key)
1856 {
1857         char *data_offset;
1858         struct create_context *cc;
1859         unsigned int next;
1860         unsigned int remaining;
1861         char *name;
1862
1863         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1864         remaining = le32_to_cpu(rsp->CreateContextsLength);
1865         cc = (struct create_context *)data_offset;
1866         while (remaining >= sizeof(struct create_context)) {
1867                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1868                 if (le16_to_cpu(cc->NameLength) == 4 &&
1869                     strncmp(name, "RqLs", 4) == 0)
1870                         return server->ops->parse_lease_buf(cc, epoch,
1871                                                             lease_key);
1872
1873                 next = le32_to_cpu(cc->Next);
1874                 if (!next)
1875                         break;
1876                 remaining -= next;
1877                 cc = (struct create_context *)((char *)cc + next);
1878         }
1879
1880         return 0;
1881 }
1882
1883 static int
1884 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1885                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1886 {
1887         struct smb2_create_req *req = iov[0].iov_base;
1888         unsigned int num = *num_iovec;
1889
1890         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1891         if (iov[num].iov_base == NULL)
1892                 return -ENOMEM;
1893         iov[num].iov_len = server->vals->create_lease_size;
1894         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1895         if (!req->CreateContextsOffset)
1896                 req->CreateContextsOffset = cpu_to_le32(
1897                                 sizeof(struct smb2_create_req) +
1898                                 iov[num - 1].iov_len);
1899         le32_add_cpu(&req->CreateContextsLength,
1900                      server->vals->create_lease_size);
1901         *num_iovec = num + 1;
1902         return 0;
1903 }
1904
1905 static struct create_durable_v2 *
1906 create_durable_v2_buf(struct cifs_open_parms *oparms)
1907 {
1908         struct cifs_fid *pfid = oparms->fid;
1909         struct create_durable_v2 *buf;
1910
1911         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1912         if (!buf)
1913                 return NULL;
1914
1915         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1916                                         (struct create_durable_v2, dcontext));
1917         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1918         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1919                                 (struct create_durable_v2, Name));
1920         buf->ccontext.NameLength = cpu_to_le16(4);
1921
1922         /*
1923          * NB: Handle timeout defaults to 0, which allows server to choose
1924          * (most servers default to 120 seconds) and most clients default to 0.
1925          * This can be overridden at mount ("handletimeout=") if the user wants
1926          * a different persistent (or resilient) handle timeout for all opens
1927          * opens on a particular SMB3 mount.
1928          */
1929         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
1930         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1931         generate_random_uuid(buf->dcontext.CreateGuid);
1932         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1933
1934         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1935         buf->Name[0] = 'D';
1936         buf->Name[1] = 'H';
1937         buf->Name[2] = '2';
1938         buf->Name[3] = 'Q';
1939         return buf;
1940 }
1941
1942 static struct create_durable_handle_reconnect_v2 *
1943 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1944 {
1945         struct create_durable_handle_reconnect_v2 *buf;
1946
1947         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1948                         GFP_KERNEL);
1949         if (!buf)
1950                 return NULL;
1951
1952         buf->ccontext.DataOffset =
1953                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1954                                      dcontext));
1955         buf->ccontext.DataLength =
1956                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1957         buf->ccontext.NameOffset =
1958                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1959                             Name));
1960         buf->ccontext.NameLength = cpu_to_le16(4);
1961
1962         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1963         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1964         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1965         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1966
1967         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1968         buf->Name[0] = 'D';
1969         buf->Name[1] = 'H';
1970         buf->Name[2] = '2';
1971         buf->Name[3] = 'C';
1972         return buf;
1973 }
1974
1975 static int
1976 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1977                     struct cifs_open_parms *oparms)
1978 {
1979         struct smb2_create_req *req = iov[0].iov_base;
1980         unsigned int num = *num_iovec;
1981
1982         iov[num].iov_base = create_durable_v2_buf(oparms);
1983         if (iov[num].iov_base == NULL)
1984                 return -ENOMEM;
1985         iov[num].iov_len = sizeof(struct create_durable_v2);
1986         if (!req->CreateContextsOffset)
1987                 req->CreateContextsOffset =
1988                         cpu_to_le32(sizeof(struct smb2_create_req) +
1989                                                                 iov[1].iov_len);
1990         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1991         *num_iovec = num + 1;
1992         return 0;
1993 }
1994
1995 static int
1996 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1997                     struct cifs_open_parms *oparms)
1998 {
1999         struct smb2_create_req *req = iov[0].iov_base;
2000         unsigned int num = *num_iovec;
2001
2002         /* indicate that we don't need to relock the file */
2003         oparms->reconnect = false;
2004
2005         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2006         if (iov[num].iov_base == NULL)
2007                 return -ENOMEM;
2008         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2009         if (!req->CreateContextsOffset)
2010                 req->CreateContextsOffset =
2011                         cpu_to_le32(sizeof(struct smb2_create_req) +
2012                                                                 iov[1].iov_len);
2013         le32_add_cpu(&req->CreateContextsLength,
2014                         sizeof(struct create_durable_handle_reconnect_v2));
2015         *num_iovec = num + 1;
2016         return 0;
2017 }
2018
2019 static int
2020 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2021                     struct cifs_open_parms *oparms, bool use_persistent)
2022 {
2023         struct smb2_create_req *req = iov[0].iov_base;
2024         unsigned int num = *num_iovec;
2025
2026         if (use_persistent) {
2027                 if (oparms->reconnect)
2028                         return add_durable_reconnect_v2_context(iov, num_iovec,
2029                                                                 oparms);
2030                 else
2031                         return add_durable_v2_context(iov, num_iovec, oparms);
2032         }
2033
2034         if (oparms->reconnect) {
2035                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2036                 /* indicate that we don't need to relock the file */
2037                 oparms->reconnect = false;
2038         } else
2039                 iov[num].iov_base = create_durable_buf();
2040         if (iov[num].iov_base == NULL)
2041                 return -ENOMEM;
2042         iov[num].iov_len = sizeof(struct create_durable);
2043         if (!req->CreateContextsOffset)
2044                 req->CreateContextsOffset =
2045                         cpu_to_le32(sizeof(struct smb2_create_req) +
2046                                                                 iov[1].iov_len);
2047         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2048         *num_iovec = num + 1;
2049         return 0;
2050 }
2051
2052 /* See MS-SMB2 2.2.13.2.7 */
2053 static struct crt_twarp_ctxt *
2054 create_twarp_buf(__u64 timewarp)
2055 {
2056         struct crt_twarp_ctxt *buf;
2057
2058         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2059         if (!buf)
2060                 return NULL;
2061
2062         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2063                                         (struct crt_twarp_ctxt, Timestamp));
2064         buf->ccontext.DataLength = cpu_to_le32(8);
2065         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2066                                 (struct crt_twarp_ctxt, Name));
2067         buf->ccontext.NameLength = cpu_to_le16(4);
2068         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2069         buf->Name[0] = 'T';
2070         buf->Name[1] = 'W';
2071         buf->Name[2] = 'r';
2072         buf->Name[3] = 'p';
2073         buf->Timestamp = cpu_to_le64(timewarp);
2074         return buf;
2075 }
2076
2077 /* See MS-SMB2 2.2.13.2.7 */
2078 static int
2079 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2080 {
2081         struct smb2_create_req *req = iov[0].iov_base;
2082         unsigned int num = *num_iovec;
2083
2084         iov[num].iov_base = create_twarp_buf(timewarp);
2085         if (iov[num].iov_base == NULL)
2086                 return -ENOMEM;
2087         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2088         if (!req->CreateContextsOffset)
2089                 req->CreateContextsOffset = cpu_to_le32(
2090                                 sizeof(struct smb2_create_req) +
2091                                 iov[num - 1].iov_len);
2092         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2093         *num_iovec = num + 1;
2094         return 0;
2095 }
2096
2097 static int
2098 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2099                             const char *treename, const __le16 *path)
2100 {
2101         int treename_len, path_len;
2102         struct nls_table *cp;
2103         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2104
2105         /*
2106          * skip leading "\\"
2107          */
2108         treename_len = strlen(treename);
2109         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2110                 return -EINVAL;
2111
2112         treename += 2;
2113         treename_len -= 2;
2114
2115         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2116
2117         /*
2118          * make room for one path separator between the treename and
2119          * path
2120          */
2121         *out_len = treename_len + 1 + path_len;
2122
2123         /*
2124          * final path needs to be null-terminated UTF16 with a
2125          * size aligned to 8
2126          */
2127
2128         *out_size = roundup((*out_len+1)*2, 8);
2129         *out_path = kzalloc(*out_size, GFP_KERNEL);
2130         if (!*out_path)
2131                 return -ENOMEM;
2132
2133         cp = load_nls_default();
2134         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2135         UniStrcat(*out_path, sep);
2136         UniStrcat(*out_path, path);
2137         unload_nls(cp);
2138
2139         return 0;
2140 }
2141
2142 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2143                                umode_t mode, struct cifs_tcon *tcon,
2144                                const char *full_path,
2145                                struct cifs_sb_info *cifs_sb)
2146 {
2147         struct smb_rqst rqst;
2148         struct smb2_create_req *req;
2149         struct smb2_create_rsp *rsp = NULL;
2150         struct cifs_ses *ses = tcon->ses;
2151         struct kvec iov[3]; /* make sure at least one for each open context */
2152         struct kvec rsp_iov = {NULL, 0};
2153         int resp_buftype;
2154         int uni_path_len;
2155         __le16 *copy_path = NULL;
2156         int copy_size;
2157         int rc = 0;
2158         unsigned int n_iov = 2;
2159         __u32 file_attributes = 0;
2160         char *pc_buf = NULL;
2161         int flags = 0;
2162         unsigned int total_len;
2163         __le16 *utf16_path = NULL;
2164
2165         cifs_dbg(FYI, "mkdir\n");
2166
2167         /* resource #1: path allocation */
2168         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2169         if (!utf16_path)
2170                 return -ENOMEM;
2171
2172         if (!ses || !(ses->server)) {
2173                 rc = -EIO;
2174                 goto err_free_path;
2175         }
2176
2177         /* resource #2: request */
2178         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2179         if (rc)
2180                 goto err_free_path;
2181
2182
2183         if (smb3_encryption_required(tcon))
2184                 flags |= CIFS_TRANSFORM_REQ;
2185
2186         req->ImpersonationLevel = IL_IMPERSONATION;
2187         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2188         /* File attributes ignored on open (used in create though) */
2189         req->FileAttributes = cpu_to_le32(file_attributes);
2190         req->ShareAccess = FILE_SHARE_ALL_LE;
2191         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2192         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2193
2194         iov[0].iov_base = (char *)req;
2195         /* -1 since last byte is buf[0] which is sent below (path) */
2196         iov[0].iov_len = total_len - 1;
2197
2198         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2199
2200         /* [MS-SMB2] 2.2.13 NameOffset:
2201          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2202          * the SMB2 header, the file name includes a prefix that will
2203          * be processed during DFS name normalization as specified in
2204          * section 3.3.5.9. Otherwise, the file name is relative to
2205          * the share that is identified by the TreeId in the SMB2
2206          * header.
2207          */
2208         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2209                 int name_len;
2210
2211                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2212                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2213                                                  &name_len,
2214                                                  tcon->treeName, utf16_path);
2215                 if (rc)
2216                         goto err_free_req;
2217
2218                 req->NameLength = cpu_to_le16(name_len * 2);
2219                 uni_path_len = copy_size;
2220                 /* free before overwriting resource */
2221                 kfree(utf16_path);
2222                 utf16_path = copy_path;
2223         } else {
2224                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2225                 /* MUST set path len (NameLength) to 0 opening root of share */
2226                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2227                 if (uni_path_len % 8 != 0) {
2228                         copy_size = roundup(uni_path_len, 8);
2229                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2230                         if (!copy_path) {
2231                                 rc = -ENOMEM;
2232                                 goto err_free_req;
2233                         }
2234                         memcpy((char *)copy_path, (const char *)utf16_path,
2235                                uni_path_len);
2236                         uni_path_len = copy_size;
2237                         /* free before overwriting resource */
2238                         kfree(utf16_path);
2239                         utf16_path = copy_path;
2240                 }
2241         }
2242
2243         iov[1].iov_len = uni_path_len;
2244         iov[1].iov_base = utf16_path;
2245         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2246
2247         if (tcon->posix_extensions) {
2248                 /* resource #3: posix buf */
2249                 rc = add_posix_context(iov, &n_iov, mode);
2250                 if (rc)
2251                         goto err_free_req;
2252                 pc_buf = iov[n_iov-1].iov_base;
2253         }
2254
2255
2256         memset(&rqst, 0, sizeof(struct smb_rqst));
2257         rqst.rq_iov = iov;
2258         rqst.rq_nvec = n_iov;
2259
2260         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2261                                     FILE_WRITE_ATTRIBUTES);
2262         /* resource #4: response buffer */
2263         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2264         if (rc) {
2265                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2266                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2267                                            CREATE_NOT_FILE,
2268                                            FILE_WRITE_ATTRIBUTES, rc);
2269                 goto err_free_rsp_buf;
2270         }
2271
2272         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2273         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2274                                     ses->Suid, CREATE_NOT_FILE,
2275                                     FILE_WRITE_ATTRIBUTES);
2276
2277         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2278
2279         /* Eventually save off posix specific response info and timestaps */
2280
2281 err_free_rsp_buf:
2282         free_rsp_buf(resp_buftype, rsp);
2283         kfree(pc_buf);
2284 err_free_req:
2285         cifs_small_buf_release(req);
2286 err_free_path:
2287         kfree(utf16_path);
2288         return rc;
2289 }
2290
2291 int
2292 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2293                struct cifs_open_parms *oparms, __le16 *path)
2294 {
2295         struct TCP_Server_Info *server = tcon->ses->server;
2296         struct smb2_create_req *req;
2297         unsigned int n_iov = 2;
2298         __u32 file_attributes = 0;
2299         int copy_size;
2300         int uni_path_len;
2301         unsigned int total_len;
2302         struct kvec *iov = rqst->rq_iov;
2303         __le16 *copy_path;
2304         int rc;
2305
2306         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2307         if (rc)
2308                 return rc;
2309
2310         iov[0].iov_base = (char *)req;
2311         /* -1 since last byte is buf[0] which is sent below (path) */
2312         iov[0].iov_len = total_len - 1;
2313
2314         if (oparms->create_options & CREATE_OPTION_READONLY)
2315                 file_attributes |= ATTR_READONLY;
2316         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2317                 file_attributes |= ATTR_SYSTEM;
2318
2319         req->ImpersonationLevel = IL_IMPERSONATION;
2320         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2321         /* File attributes ignored on open (used in create though) */
2322         req->FileAttributes = cpu_to_le32(file_attributes);
2323         req->ShareAccess = FILE_SHARE_ALL_LE;
2324         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2325         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2326         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2327
2328         /* [MS-SMB2] 2.2.13 NameOffset:
2329          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2330          * the SMB2 header, the file name includes a prefix that will
2331          * be processed during DFS name normalization as specified in
2332          * section 3.3.5.9. Otherwise, the file name is relative to
2333          * the share that is identified by the TreeId in the SMB2
2334          * header.
2335          */
2336         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2337                 int name_len;
2338
2339                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2340                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2341                                                  &name_len,
2342                                                  tcon->treeName, path);
2343                 if (rc)
2344                         return rc;
2345                 req->NameLength = cpu_to_le16(name_len * 2);
2346                 uni_path_len = copy_size;
2347                 path = copy_path;
2348         } else {
2349                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2350                 /* MUST set path len (NameLength) to 0 opening root of share */
2351                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2352                 copy_size = uni_path_len;
2353                 if (copy_size % 8 != 0)
2354                         copy_size = roundup(copy_size, 8);
2355                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2356                 if (!copy_path)
2357                         return -ENOMEM;
2358                 memcpy((char *)copy_path, (const char *)path,
2359                        uni_path_len);
2360                 uni_path_len = copy_size;
2361                 path = copy_path;
2362         }
2363
2364         iov[1].iov_len = uni_path_len;
2365         iov[1].iov_base = path;
2366
2367         if (!server->oplocks)
2368                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2369
2370         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2371             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2372                 req->RequestedOplockLevel = *oplock;
2373         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2374                   (oparms->create_options & CREATE_NOT_FILE))
2375                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2376         else {
2377                 rc = add_lease_context(server, iov, &n_iov,
2378                                        oparms->fid->lease_key, oplock);
2379                 if (rc)
2380                         return rc;
2381         }
2382
2383         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2384                 /* need to set Next field of lease context if we request it */
2385                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2386                         struct create_context *ccontext =
2387                             (struct create_context *)iov[n_iov-1].iov_base;
2388                         ccontext->Next =
2389                                 cpu_to_le32(server->vals->create_lease_size);
2390                 }
2391
2392                 rc = add_durable_context(iov, &n_iov, oparms,
2393                                         tcon->use_persistent);
2394                 if (rc)
2395                         return rc;
2396         }
2397
2398         if (tcon->posix_extensions) {
2399                 if (n_iov > 2) {
2400                         struct create_context *ccontext =
2401                             (struct create_context *)iov[n_iov-1].iov_base;
2402                         ccontext->Next =
2403                                 cpu_to_le32(iov[n_iov-1].iov_len);
2404                 }
2405
2406                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2407                 if (rc)
2408                         return rc;
2409         }
2410
2411         if (tcon->snapshot_time) {
2412                 cifs_dbg(FYI, "adding snapshot context\n");
2413                 if (n_iov > 2) {
2414                         struct create_context *ccontext =
2415                             (struct create_context *)iov[n_iov-1].iov_base;
2416                         ccontext->Next =
2417                                 cpu_to_le32(iov[n_iov-1].iov_len);
2418                 }
2419
2420                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2421                 if (rc)
2422                         return rc;
2423         }
2424
2425
2426         rqst->rq_nvec = n_iov;
2427         return 0;
2428 }
2429
2430 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2431  * All other vectors are freed by kfree().
2432  */
2433 void
2434 SMB2_open_free(struct smb_rqst *rqst)
2435 {
2436         int i;
2437
2438         if (rqst && rqst->rq_iov) {
2439                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2440                 for (i = 1; i < rqst->rq_nvec; i++)
2441                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2442                                 kfree(rqst->rq_iov[i].iov_base);
2443         }
2444 }
2445
2446 int
2447 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2448           __u8 *oplock, struct smb2_file_all_info *buf,
2449           struct kvec *err_iov, int *buftype)
2450 {
2451         struct smb_rqst rqst;
2452         struct smb2_create_rsp *rsp = NULL;
2453         struct TCP_Server_Info *server;
2454         struct cifs_tcon *tcon = oparms->tcon;
2455         struct cifs_ses *ses = tcon->ses;
2456         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2457         struct kvec rsp_iov = {NULL, 0};
2458         int resp_buftype = CIFS_NO_BUFFER;
2459         int rc = 0;
2460         int flags = 0;
2461
2462         cifs_dbg(FYI, "create/open\n");
2463         if (ses && (ses->server))
2464                 server = ses->server;
2465         else
2466                 return -EIO;
2467
2468         if (smb3_encryption_required(tcon))
2469                 flags |= CIFS_TRANSFORM_REQ;
2470
2471         memset(&rqst, 0, sizeof(struct smb_rqst));
2472         memset(&iov, 0, sizeof(iov));
2473         rqst.rq_iov = iov;
2474         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2475
2476         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2477         if (rc)
2478                 goto creat_exit;
2479
2480         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2481                 oparms->create_options, oparms->desired_access);
2482
2483         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2484                             &rsp_iov);
2485         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2486
2487         if (rc != 0) {
2488                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2489                 if (err_iov && rsp) {
2490                         *err_iov = rsp_iov;
2491                         *buftype = resp_buftype;
2492                         resp_buftype = CIFS_NO_BUFFER;
2493                         rsp = NULL;
2494                 }
2495                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2496                                     oparms->create_options, oparms->desired_access, rc);
2497                 goto creat_exit;
2498         } else
2499                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2500                                      ses->Suid, oparms->create_options,
2501                                      oparms->desired_access);
2502
2503         atomic_inc(&tcon->num_remote_opens);
2504         oparms->fid->persistent_fid = rsp->PersistentFileId;
2505         oparms->fid->volatile_fid = rsp->VolatileFileId;
2506 #ifdef CONFIG_CIFS_DEBUG2
2507         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2508 #endif /* CIFS_DEBUG2 */
2509
2510         if (buf) {
2511                 memcpy(buf, &rsp->CreationTime, 32);
2512                 buf->AllocationSize = rsp->AllocationSize;
2513                 buf->EndOfFile = rsp->EndofFile;
2514                 buf->Attributes = rsp->FileAttributes;
2515                 buf->NumberOfLinks = cpu_to_le32(1);
2516                 buf->DeletePending = 0;
2517         }
2518
2519         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2520                 *oplock = smb2_parse_lease_state(server, rsp,
2521                                                  &oparms->fid->epoch,
2522                                                  oparms->fid->lease_key);
2523         else
2524                 *oplock = rsp->OplockLevel;
2525 creat_exit:
2526         SMB2_open_free(&rqst);
2527         free_rsp_buf(resp_buftype, rsp);
2528         return rc;
2529 }
2530
2531 int
2532 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2533                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2534                 bool is_fsctl, char *in_data, u32 indatalen,
2535                 __u32 max_response_size)
2536 {
2537         struct smb2_ioctl_req *req;
2538         struct kvec *iov = rqst->rq_iov;
2539         unsigned int total_len;
2540         int rc;
2541         char *in_data_buf;
2542
2543         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2544         if (rc)
2545                 return rc;
2546
2547         if (indatalen) {
2548                 /*
2549                  * indatalen is usually small at a couple of bytes max, so
2550                  * just allocate through generic pool
2551                  */
2552                 in_data_buf = kmalloc(indatalen, GFP_NOFS);
2553                 if (!in_data_buf) {
2554                         cifs_small_buf_release(req);
2555                         return -ENOMEM;
2556                 }
2557                 memcpy(in_data_buf, in_data, indatalen);
2558         }
2559
2560         req->CtlCode = cpu_to_le32(opcode);
2561         req->PersistentFileId = persistent_fid;
2562         req->VolatileFileId = volatile_fid;
2563
2564         iov[0].iov_base = (char *)req;
2565         /*
2566          * If no input data, the size of ioctl struct in
2567          * protocol spec still includes a 1 byte data buffer,
2568          * but if input data passed to ioctl, we do not
2569          * want to double count this, so we do not send
2570          * the dummy one byte of data in iovec[0] if sending
2571          * input data (in iovec[1]).
2572          */
2573         if (indatalen) {
2574                 req->InputCount = cpu_to_le32(indatalen);
2575                 /* do not set InputOffset if no input data */
2576                 req->InputOffset =
2577                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2578                 rqst->rq_nvec = 2;
2579                 iov[0].iov_len = total_len - 1;
2580                 iov[1].iov_base = in_data_buf;
2581                 iov[1].iov_len = indatalen;
2582         } else {
2583                 rqst->rq_nvec = 1;
2584                 iov[0].iov_len = total_len;
2585         }
2586
2587         req->OutputOffset = 0;
2588         req->OutputCount = 0; /* MBZ */
2589
2590         /*
2591          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2592          * We Could increase default MaxOutputResponse, but that could require
2593          * more credits. Windows typically sets this smaller, but for some
2594          * ioctls it may be useful to allow server to send more. No point
2595          * limiting what the server can send as long as fits in one credit
2596          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2597          * to increase this limit up in the future.
2598          * Note that for snapshot queries that servers like Azure expect that
2599          * the first query be minimal size (and just used to get the number/size
2600          * of previous versions) so response size must be specified as EXACTLY
2601          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2602          * of eight bytes.  Currently that is the only case where we set max
2603          * response size smaller.
2604          */
2605         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2606
2607         if (is_fsctl)
2608                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2609         else
2610                 req->Flags = 0;
2611
2612         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2613         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2614                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2615
2616         return 0;
2617 }
2618
2619 void
2620 SMB2_ioctl_free(struct smb_rqst *rqst)
2621 {
2622         if (rqst && rqst->rq_iov) {
2623                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2624                 if (rqst->rq_iov[1].iov_len)
2625                         kfree(rqst->rq_iov[1].iov_base);
2626         }
2627 }
2628
2629
2630 /*
2631  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2632  */
2633 int
2634 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2635            u64 volatile_fid, u32 opcode, bool is_fsctl,
2636            char *in_data, u32 indatalen, u32 max_out_data_len,
2637            char **out_data, u32 *plen /* returned data len */)
2638 {
2639         struct smb_rqst rqst;
2640         struct smb2_ioctl_rsp *rsp = NULL;
2641         struct cifs_ses *ses;
2642         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2643         struct kvec rsp_iov = {NULL, 0};
2644         int resp_buftype = CIFS_NO_BUFFER;
2645         int rc = 0;
2646         int flags = 0;
2647
2648         cifs_dbg(FYI, "SMB2 IOCTL\n");
2649
2650         if (out_data != NULL)
2651                 *out_data = NULL;
2652
2653         /* zero out returned data len, in case of error */
2654         if (plen)
2655                 *plen = 0;
2656
2657         if (tcon)
2658                 ses = tcon->ses;
2659         else
2660                 return -EIO;
2661
2662         if (!ses || !(ses->server))
2663                 return -EIO;
2664
2665         if (smb3_encryption_required(tcon))
2666                 flags |= CIFS_TRANSFORM_REQ;
2667
2668         memset(&rqst, 0, sizeof(struct smb_rqst));
2669         memset(&iov, 0, sizeof(iov));
2670         rqst.rq_iov = iov;
2671         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2672
2673         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
2674                              is_fsctl, in_data, indatalen, max_out_data_len);
2675         if (rc)
2676                 goto ioctl_exit;
2677
2678         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2679                             &rsp_iov);
2680         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2681
2682         if (rc != 0)
2683                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2684                                 ses->Suid, 0, opcode, rc);
2685
2686         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
2687                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2688                 goto ioctl_exit;
2689         } else if (rc == -EINVAL) {
2690                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2691                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2692                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2693                         goto ioctl_exit;
2694                 }
2695         } else if (rc == -E2BIG) {
2696                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
2697                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2698                         goto ioctl_exit;
2699                 }
2700         }
2701
2702         /* check if caller wants to look at return data or just return rc */
2703         if ((plen == NULL) || (out_data == NULL))
2704                 goto ioctl_exit;
2705
2706         *plen = le32_to_cpu(rsp->OutputCount);
2707
2708         /* We check for obvious errors in the output buffer length and offset */
2709         if (*plen == 0)
2710                 goto ioctl_exit; /* server returned no data */
2711         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2712                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2713                 *plen = 0;
2714                 rc = -EIO;
2715                 goto ioctl_exit;
2716         }
2717
2718         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2719                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2720                         le32_to_cpu(rsp->OutputOffset));
2721                 *plen = 0;
2722                 rc = -EIO;
2723                 goto ioctl_exit;
2724         }
2725
2726         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2727                             *plen, GFP_KERNEL);
2728         if (*out_data == NULL) {
2729                 rc = -ENOMEM;
2730                 goto ioctl_exit;
2731         }
2732
2733 ioctl_exit:
2734         SMB2_ioctl_free(&rqst);
2735         free_rsp_buf(resp_buftype, rsp);
2736         return rc;
2737 }
2738
2739 /*
2740  *   Individual callers to ioctl worker function follow
2741  */
2742
2743 int
2744 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2745                      u64 persistent_fid, u64 volatile_fid)
2746 {
2747         int rc;
2748         struct  compress_ioctl fsctl_input;
2749         char *ret_data = NULL;
2750
2751         fsctl_input.CompressionState =
2752                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2753
2754         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2755                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2756                         (char *)&fsctl_input /* data input */,
2757                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
2758                         &ret_data /* out data */, NULL);
2759
2760         cifs_dbg(FYI, "set compression rc %d\n", rc);
2761
2762         return rc;
2763 }
2764
2765 int
2766 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2767                 u64 persistent_fid, u64 volatile_fid)
2768 {
2769         struct smb2_close_req *req;
2770         struct kvec *iov = rqst->rq_iov;
2771         unsigned int total_len;
2772         int rc;
2773
2774         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2775         if (rc)
2776                 return rc;
2777
2778         req->PersistentFileId = persistent_fid;
2779         req->VolatileFileId = volatile_fid;
2780         iov[0].iov_base = (char *)req;
2781         iov[0].iov_len = total_len;
2782
2783         return 0;
2784 }
2785
2786 void
2787 SMB2_close_free(struct smb_rqst *rqst)
2788 {
2789         if (rqst && rqst->rq_iov)
2790                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2791 }
2792
2793 int
2794 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2795                  u64 persistent_fid, u64 volatile_fid, int flags)
2796 {
2797         struct smb_rqst rqst;
2798         struct smb2_close_rsp *rsp = NULL;
2799         struct cifs_ses *ses = tcon->ses;
2800         struct kvec iov[1];
2801         struct kvec rsp_iov;
2802         int resp_buftype = CIFS_NO_BUFFER;
2803         int rc = 0;
2804
2805         cifs_dbg(FYI, "Close\n");
2806
2807         if (!ses || !(ses->server))
2808                 return -EIO;
2809
2810         if (smb3_encryption_required(tcon))
2811                 flags |= CIFS_TRANSFORM_REQ;
2812
2813         memset(&rqst, 0, sizeof(struct smb_rqst));
2814         memset(&iov, 0, sizeof(iov));
2815         rqst.rq_iov = iov;
2816         rqst.rq_nvec = 1;
2817
2818         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2819         if (rc)
2820                 goto close_exit;
2821
2822         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2823         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2824
2825         if (rc != 0) {
2826                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2827                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2828                                      rc);
2829                 goto close_exit;
2830         }
2831
2832         atomic_dec(&tcon->num_remote_opens);
2833
2834         /* BB FIXME - decode close response, update inode for caching */
2835
2836 close_exit:
2837         SMB2_close_free(&rqst);
2838         free_rsp_buf(resp_buftype, rsp);
2839         return rc;
2840 }
2841
2842 int
2843 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2844            u64 persistent_fid, u64 volatile_fid)
2845 {
2846         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2847 }
2848
2849 int
2850 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2851                   struct kvec *iov, unsigned int min_buf_size)
2852 {
2853         unsigned int smb_len = iov->iov_len;
2854         char *end_of_smb = smb_len + (char *)iov->iov_base;
2855         char *begin_of_buf = offset + (char *)iov->iov_base;
2856         char *end_of_buf = begin_of_buf + buffer_length;
2857
2858
2859         if (buffer_length < min_buf_size) {
2860                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2861                          buffer_length, min_buf_size);
2862                 return -EINVAL;
2863         }
2864
2865         /* check if beyond RFC1001 maximum length */
2866         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2867                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2868                          buffer_length, smb_len);
2869                 return -EINVAL;
2870         }
2871
2872         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2873                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2874                 return -EINVAL;
2875         }
2876
2877         return 0;
2878 }
2879
2880 /*
2881  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2882  * Caller must free buffer.
2883  */
2884 int
2885 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2886                            struct kvec *iov, unsigned int minbufsize,
2887                            char *data)
2888 {
2889         char *begin_of_buf = offset + (char *)iov->iov_base;
2890         int rc;
2891
2892         if (!data)
2893                 return -EINVAL;
2894
2895         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2896         if (rc)
2897                 return rc;
2898
2899         memcpy(data, begin_of_buf, buffer_length);
2900
2901         return 0;
2902 }
2903
2904 int
2905 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2906                      u64 persistent_fid, u64 volatile_fid,
2907                      u8 info_class, u8 info_type, u32 additional_info,
2908                      size_t output_len, size_t input_len, void *input)
2909 {
2910         struct smb2_query_info_req *req;
2911         struct kvec *iov = rqst->rq_iov;
2912         unsigned int total_len;
2913         int rc;
2914
2915         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2916                              &total_len);
2917         if (rc)
2918                 return rc;
2919
2920         req->InfoType = info_type;
2921         req->FileInfoClass = info_class;
2922         req->PersistentFileId = persistent_fid;
2923         req->VolatileFileId = volatile_fid;
2924         req->AdditionalInformation = cpu_to_le32(additional_info);
2925
2926         req->OutputBufferLength = cpu_to_le32(output_len);
2927         if (input_len) {
2928                 req->InputBufferLength = cpu_to_le32(input_len);
2929                 /* total_len for smb query request never close to le16 max */
2930                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2931                 memcpy(req->Buffer, input, input_len);
2932         }
2933
2934         iov[0].iov_base = (char *)req;
2935         /* 1 for Buffer */
2936         iov[0].iov_len = total_len - 1 + input_len;
2937         return 0;
2938 }
2939
2940 void
2941 SMB2_query_info_free(struct smb_rqst *rqst)
2942 {
2943         if (rqst && rqst->rq_iov)
2944                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2945 }
2946
2947 static int
2948 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2949            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2950            u32 additional_info, size_t output_len, size_t min_len, void **data,
2951                 u32 *dlen)
2952 {
2953         struct smb_rqst rqst;
2954         struct smb2_query_info_rsp *rsp = NULL;
2955         struct kvec iov[1];
2956         struct kvec rsp_iov;
2957         int rc = 0;
2958         int resp_buftype = CIFS_NO_BUFFER;
2959         struct cifs_ses *ses = tcon->ses;
2960         int flags = 0;
2961         bool allocated = false;
2962
2963         cifs_dbg(FYI, "Query Info\n");
2964
2965         if (!ses || !(ses->server))
2966                 return -EIO;
2967
2968         if (smb3_encryption_required(tcon))
2969                 flags |= CIFS_TRANSFORM_REQ;
2970
2971         memset(&rqst, 0, sizeof(struct smb_rqst));
2972         memset(&iov, 0, sizeof(iov));
2973         rqst.rq_iov = iov;
2974         rqst.rq_nvec = 1;
2975
2976         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2977                                   info_class, info_type, additional_info,
2978                                   output_len, 0, NULL);
2979         if (rc)
2980                 goto qinf_exit;
2981
2982         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
2983                                     ses->Suid, info_class, (__u32)info_type);
2984
2985         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2986         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2987
2988         if (rc) {
2989                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2990                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2991                                 ses->Suid, info_class, (__u32)info_type, rc);
2992                 goto qinf_exit;
2993         }
2994
2995         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
2996                                 ses->Suid, info_class, (__u32)info_type);
2997
2998         if (dlen) {
2999                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3000                 if (!*data) {
3001                         *data = kmalloc(*dlen, GFP_KERNEL);
3002                         if (!*data) {
3003                                 cifs_dbg(VFS,
3004                                         "Error %d allocating memory for acl\n",
3005                                         rc);
3006                                 *dlen = 0;
3007                                 rc = -ENOMEM;
3008                                 goto qinf_exit;
3009                         }
3010                         allocated = true;
3011                 }
3012         }
3013
3014         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3015                                         le32_to_cpu(rsp->OutputBufferLength),
3016                                         &rsp_iov, min_len, *data);
3017         if (rc && allocated) {
3018                 kfree(*data);
3019                 *data = NULL;
3020                 *dlen = 0;
3021         }
3022
3023 qinf_exit:
3024         SMB2_query_info_free(&rqst);
3025         free_rsp_buf(resp_buftype, rsp);
3026         return rc;
3027 }
3028
3029 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3030         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3031 {
3032         return query_info(xid, tcon, persistent_fid, volatile_fid,
3033                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3034                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3035                           sizeof(struct smb2_file_all_info), (void **)&data,
3036                           NULL);
3037 }
3038
3039 int
3040 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3041                 u64 persistent_fid, u64 volatile_fid,
3042                 void **data, u32 *plen)
3043 {
3044         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3045         *plen = 0;
3046
3047         return query_info(xid, tcon, persistent_fid, volatile_fid,
3048                           0, SMB2_O_INFO_SECURITY, additional_info,
3049                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3050 }
3051
3052 int
3053 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3054                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3055 {
3056         return query_info(xid, tcon, persistent_fid, volatile_fid,
3057                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3058                           sizeof(struct smb2_file_internal_info),
3059                           sizeof(struct smb2_file_internal_info),
3060                           (void **)&uniqueid, NULL);
3061 }
3062
3063 /*
3064  * This is a no-op for now. We're not really interested in the reply, but
3065  * rather in the fact that the server sent one and that server->lstrp
3066  * gets updated.
3067  *
3068  * FIXME: maybe we should consider checking that the reply matches request?
3069  */
3070 static void
3071 smb2_echo_callback(struct mid_q_entry *mid)
3072 {
3073         struct TCP_Server_Info *server = mid->callback_data;
3074         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3075         struct cifs_credits credits = { .value = 0, .instance = 0 };
3076
3077         if (mid->mid_state == MID_RESPONSE_RECEIVED
3078             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3079                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3080                 credits.instance = server->reconnect_instance;
3081         }
3082
3083         DeleteMidQEntry(mid);
3084         add_credits(server, &credits, CIFS_ECHO_OP);
3085 }
3086
3087 void smb2_reconnect_server(struct work_struct *work)
3088 {
3089         struct TCP_Server_Info *server = container_of(work,
3090                                         struct TCP_Server_Info, reconnect.work);
3091         struct cifs_ses *ses;
3092         struct cifs_tcon *tcon, *tcon2;
3093         struct list_head tmp_list;
3094         int tcon_exist = false;
3095         int rc;
3096         int resched = false;
3097
3098
3099         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3100         mutex_lock(&server->reconnect_mutex);
3101
3102         INIT_LIST_HEAD(&tmp_list);
3103         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3104
3105         spin_lock(&cifs_tcp_ses_lock);
3106         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3107                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3108                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3109                                 tcon->tc_count++;
3110                                 list_add_tail(&tcon->rlist, &tmp_list);
3111                                 tcon_exist = true;
3112                         }
3113                 }
3114                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3115                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3116                         tcon_exist = true;
3117                 }
3118         }
3119         /*
3120          * Get the reference to server struct to be sure that the last call of
3121          * cifs_put_tcon() in the loop below won't release the server pointer.
3122          */
3123         if (tcon_exist)
3124                 server->srv_count++;
3125
3126         spin_unlock(&cifs_tcp_ses_lock);
3127
3128         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3129                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3130                 if (!rc)
3131                         cifs_reopen_persistent_handles(tcon);
3132                 else
3133                         resched = true;
3134                 list_del_init(&tcon->rlist);
3135                 cifs_put_tcon(tcon);
3136         }
3137
3138         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3139         if (resched)
3140                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3141         mutex_unlock(&server->reconnect_mutex);
3142
3143         /* now we can safely release srv struct */
3144         if (tcon_exist)
3145                 cifs_put_tcp_session(server, 1);
3146 }
3147
3148 int
3149 SMB2_echo(struct TCP_Server_Info *server)
3150 {
3151         struct smb2_echo_req *req;
3152         int rc = 0;
3153         struct kvec iov[1];
3154         struct smb_rqst rqst = { .rq_iov = iov,
3155                                  .rq_nvec = 1 };
3156         unsigned int total_len;
3157
3158         cifs_dbg(FYI, "In echo request\n");
3159
3160         if (server->tcpStatus == CifsNeedNegotiate) {
3161                 /* No need to send echo on newly established connections */
3162                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3163                 return rc;
3164         }
3165
3166         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3167         if (rc)
3168                 return rc;
3169
3170         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3171
3172         iov[0].iov_len = total_len;
3173         iov[0].iov_base = (char *)req;
3174
3175         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3176                              server, CIFS_ECHO_OP, NULL);
3177         if (rc)
3178                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3179
3180         cifs_small_buf_release(req);
3181         return rc;
3182 }
3183
3184 int
3185 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3186            u64 volatile_fid)
3187 {
3188         struct smb_rqst rqst;
3189         struct smb2_flush_req *req;
3190         struct cifs_ses *ses = tcon->ses;
3191         struct kvec iov[1];
3192         struct kvec rsp_iov;
3193         int resp_buftype;
3194         int rc = 0;
3195         int flags = 0;
3196         unsigned int total_len;
3197
3198         cifs_dbg(FYI, "Flush\n");
3199
3200         if (!ses || !(ses->server))
3201                 return -EIO;
3202
3203         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3204         if (rc)
3205                 return rc;
3206
3207         if (smb3_encryption_required(tcon))
3208                 flags |= CIFS_TRANSFORM_REQ;
3209
3210         req->PersistentFileId = persistent_fid;
3211         req->VolatileFileId = volatile_fid;
3212
3213         iov[0].iov_base = (char *)req;
3214         iov[0].iov_len = total_len;
3215
3216         memset(&rqst, 0, sizeof(struct smb_rqst));
3217         rqst.rq_iov = iov;
3218         rqst.rq_nvec = 1;
3219
3220         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3221         cifs_small_buf_release(req);
3222
3223         if (rc != 0) {
3224                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3225                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3226                                      rc);
3227         }
3228
3229         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3230         return rc;
3231 }
3232
3233 /*
3234  * To form a chain of read requests, any read requests after the first should
3235  * have the end_of_chain boolean set to true.
3236  */
3237 static int
3238 smb2_new_read_req(void **buf, unsigned int *total_len,
3239         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3240         unsigned int remaining_bytes, int request_type)
3241 {
3242         int rc = -EACCES;
3243         struct smb2_read_plain_req *req = NULL;
3244         struct smb2_sync_hdr *shdr;
3245         struct TCP_Server_Info *server;
3246
3247         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3248                                  total_len);
3249         if (rc)
3250                 return rc;
3251
3252         server = io_parms->tcon->ses->server;
3253         if (server == NULL)
3254                 return -ECONNABORTED;
3255
3256         shdr = &req->sync_hdr;
3257         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3258
3259         req->PersistentFileId = io_parms->persistent_fid;
3260         req->VolatileFileId = io_parms->volatile_fid;
3261         req->ReadChannelInfoOffset = 0; /* reserved */
3262         req->ReadChannelInfoLength = 0; /* reserved */
3263         req->Channel = 0; /* reserved */
3264         req->MinimumCount = 0;
3265         req->Length = cpu_to_le32(io_parms->length);
3266         req->Offset = cpu_to_le64(io_parms->offset);
3267
3268         trace_smb3_read_enter(0 /* xid */,
3269                         io_parms->persistent_fid,
3270                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3271                         io_parms->offset, io_parms->length);
3272 #ifdef CONFIG_CIFS_SMB_DIRECT
3273         /*
3274          * If we want to do a RDMA write, fill in and append
3275          * smbd_buffer_descriptor_v1 to the end of read request
3276          */
3277         if (server->rdma && rdata && !server->sign &&
3278                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3279
3280                 struct smbd_buffer_descriptor_v1 *v1;
3281                 bool need_invalidate =
3282                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3283
3284                 rdata->mr = smbd_register_mr(
3285                                 server->smbd_conn, rdata->pages,
3286                                 rdata->nr_pages, rdata->page_offset,
3287                                 rdata->tailsz, true, need_invalidate);
3288                 if (!rdata->mr)
3289                         return -EAGAIN;
3290
3291                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3292                 if (need_invalidate)
3293                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3294                 req->ReadChannelInfoOffset =
3295                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3296                 req->ReadChannelInfoLength =
3297                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3298                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3299                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3300                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3301                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3302
3303                 *total_len += sizeof(*v1) - 1;
3304         }
3305 #endif
3306         if (request_type & CHAINED_REQUEST) {
3307                 if (!(request_type & END_OF_CHAIN)) {
3308                         /* next 8-byte aligned request */
3309                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3310                         shdr->NextCommand = cpu_to_le32(*total_len);
3311                 } else /* END_OF_CHAIN */
3312                         shdr->NextCommand = 0;
3313                 if (request_type & RELATED_REQUEST) {
3314                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3315                         /*
3316                          * Related requests use info from previous read request
3317                          * in chain.
3318                          */
3319                         shdr->SessionId = 0xFFFFFFFF;
3320                         shdr->TreeId = 0xFFFFFFFF;
3321                         req->PersistentFileId = 0xFFFFFFFF;
3322                         req->VolatileFileId = 0xFFFFFFFF;
3323                 }
3324         }
3325         if (remaining_bytes > io_parms->length)
3326                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3327         else
3328                 req->RemainingBytes = 0;
3329
3330         *buf = req;
3331         return rc;
3332 }
3333
3334 static void
3335 smb2_readv_callback(struct mid_q_entry *mid)
3336 {
3337         struct cifs_readdata *rdata = mid->callback_data;
3338         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3339         struct TCP_Server_Info *server = tcon->ses->server;
3340         struct smb2_sync_hdr *shdr =
3341                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3342         struct cifs_credits credits = { .value = 0, .instance = 0 };
3343         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3344                                  .rq_nvec = 2,
3345                                  .rq_pages = rdata->pages,
3346                                  .rq_offset = rdata->page_offset,
3347                                  .rq_npages = rdata->nr_pages,
3348                                  .rq_pagesz = rdata->pagesz,
3349                                  .rq_tailsz = rdata->tailsz };
3350
3351         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3352                  __func__, mid->mid, mid->mid_state, rdata->result,
3353                  rdata->bytes);
3354
3355         switch (mid->mid_state) {
3356         case MID_RESPONSE_RECEIVED:
3357                 credits.value = le16_to_cpu(shdr->CreditRequest);
3358                 credits.instance = server->reconnect_instance;
3359                 /* result already set, check signature */
3360                 if (server->sign && !mid->decrypted) {
3361                         int rc;
3362
3363                         rc = smb2_verify_signature(&rqst, server);
3364                         if (rc)
3365                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3366                                          rc);
3367                 }
3368                 /* FIXME: should this be counted toward the initiating task? */
3369                 task_io_account_read(rdata->got_bytes);
3370                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3371                 break;
3372         case MID_REQUEST_SUBMITTED:
3373         case MID_RETRY_NEEDED:
3374                 rdata->result = -EAGAIN;
3375                 if (server->sign && rdata->got_bytes)
3376                         /* reset bytes number since we can not check a sign */
3377                         rdata->got_bytes = 0;
3378                 /* FIXME: should this be counted toward the initiating task? */
3379                 task_io_account_read(rdata->got_bytes);
3380                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3381                 break;
3382         case MID_RESPONSE_MALFORMED:
3383                 credits.value = le16_to_cpu(shdr->CreditRequest);
3384                 credits.instance = server->reconnect_instance;
3385                 /* fall through */
3386         default:
3387                 rdata->result = -EIO;
3388         }
3389 #ifdef CONFIG_CIFS_SMB_DIRECT
3390         /*
3391          * If this rdata has a memmory registered, the MR can be freed
3392          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3393          * because they have limited number and are used for future I/Os
3394          */
3395         if (rdata->mr) {
3396                 smbd_deregister_mr(rdata->mr);
3397                 rdata->mr = NULL;
3398         }
3399 #endif
3400         if (rdata->result && rdata->result != -ENODATA) {
3401                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3402                 trace_smb3_read_err(0 /* xid */,
3403                                     rdata->cfile->fid.persistent_fid,
3404                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3405                                     rdata->bytes, rdata->result);
3406         } else
3407                 trace_smb3_read_done(0 /* xid */,
3408                                      rdata->cfile->fid.persistent_fid,
3409                                      tcon->tid, tcon->ses->Suid,
3410                                      rdata->offset, rdata->got_bytes);
3411
3412         queue_work(cifsiod_wq, &rdata->work);
3413         DeleteMidQEntry(mid);
3414         add_credits(server, &credits, 0);
3415 }
3416
3417 /* smb2_async_readv - send an async read, and set up mid to handle result */
3418 int
3419 smb2_async_readv(struct cifs_readdata *rdata)
3420 {
3421         int rc, flags = 0;
3422         char *buf;
3423         struct smb2_sync_hdr *shdr;
3424         struct cifs_io_parms io_parms;
3425         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3426                                  .rq_nvec = 1 };
3427         struct TCP_Server_Info *server;
3428         unsigned int total_len;
3429
3430         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3431                  __func__, rdata->offset, rdata->bytes);
3432
3433         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3434         io_parms.offset = rdata->offset;
3435         io_parms.length = rdata->bytes;
3436         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3437         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3438         io_parms.pid = rdata->pid;
3439
3440         server = io_parms.tcon->ses->server;
3441
3442         rc = smb2_new_read_req(
3443                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3444         if (rc)
3445                 return rc;
3446
3447         if (smb3_encryption_required(io_parms.tcon))
3448                 flags |= CIFS_TRANSFORM_REQ;
3449
3450         rdata->iov[0].iov_base = buf;
3451         rdata->iov[0].iov_len = total_len;
3452
3453         shdr = (struct smb2_sync_hdr *)buf;
3454
3455         if (rdata->credits.value > 0) {
3456                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3457                                                 SMB2_MAX_BUFFER_SIZE));
3458                 shdr->CreditRequest =
3459                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3460
3461                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3462                 if (rc)
3463                         goto async_readv_out;
3464
3465                 flags |= CIFS_HAS_CREDITS;
3466         }
3467
3468         kref_get(&rdata->refcount);
3469         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3470                              cifs_readv_receive, smb2_readv_callback,
3471                              smb3_handle_read_data, rdata, flags,
3472                              &rdata->credits);
3473         if (rc) {
3474                 kref_put(&rdata->refcount, cifs_readdata_release);
3475                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3476                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3477                                     io_parms.tcon->tid,
3478                                     io_parms.tcon->ses->Suid,
3479                                     io_parms.offset, io_parms.length, rc);
3480         }
3481
3482 async_readv_out:
3483         cifs_small_buf_release(buf);
3484         return rc;
3485 }
3486
3487 int
3488 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3489           unsigned int *nbytes, char **buf, int *buf_type)
3490 {
3491         struct smb_rqst rqst;
3492         int resp_buftype, rc = -EACCES;
3493         struct smb2_read_plain_req *req = NULL;
3494         struct smb2_read_rsp *rsp = NULL;
3495         struct kvec iov[1];
3496         struct kvec rsp_iov;
3497         unsigned int total_len;
3498         int flags = CIFS_LOG_ERROR;
3499         struct cifs_ses *ses = io_parms->tcon->ses;
3500
3501         *nbytes = 0;
3502         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3503         if (rc)
3504                 return rc;
3505
3506         if (smb3_encryption_required(io_parms->tcon))
3507                 flags |= CIFS_TRANSFORM_REQ;
3508
3509         iov[0].iov_base = (char *)req;
3510         iov[0].iov_len = total_len;
3511
3512         memset(&rqst, 0, sizeof(struct smb_rqst));
3513         rqst.rq_iov = iov;
3514         rqst.rq_nvec = 1;
3515
3516         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3517         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3518
3519         if (rc) {
3520                 if (rc != -ENODATA) {
3521                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3522                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3523                         trace_smb3_read_err(xid, req->PersistentFileId,
3524                                             io_parms->tcon->tid, ses->Suid,
3525                                             io_parms->offset, io_parms->length,
3526                                             rc);
3527                 } else
3528                         trace_smb3_read_done(xid, req->PersistentFileId,
3529                                     io_parms->tcon->tid, ses->Suid,
3530                                     io_parms->offset, 0);
3531                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3532                 cifs_small_buf_release(req);
3533                 return rc == -ENODATA ? 0 : rc;
3534         } else
3535                 trace_smb3_read_done(xid, req->PersistentFileId,
3536                                     io_parms->tcon->tid, ses->Suid,
3537                                     io_parms->offset, io_parms->length);
3538
3539         cifs_small_buf_release(req);
3540
3541         *nbytes = le32_to_cpu(rsp->DataLength);
3542         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3543             (*nbytes > io_parms->length)) {
3544                 cifs_dbg(FYI, "bad length %d for count %d\n",
3545                          *nbytes, io_parms->length);
3546                 rc = -EIO;
3547                 *nbytes = 0;
3548         }
3549
3550         if (*buf) {
3551                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3552                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3553         } else if (resp_buftype != CIFS_NO_BUFFER) {
3554                 *buf = rsp_iov.iov_base;
3555                 if (resp_buftype == CIFS_SMALL_BUFFER)
3556                         *buf_type = CIFS_SMALL_BUFFER;
3557                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3558                         *buf_type = CIFS_LARGE_BUFFER;
3559         }
3560         return rc;
3561 }
3562
3563 /*
3564  * Check the mid_state and signature on received buffer (if any), and queue the
3565  * workqueue completion task.
3566  */
3567 static void
3568 smb2_writev_callback(struct mid_q_entry *mid)
3569 {
3570         struct cifs_writedata *wdata = mid->callback_data;
3571         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3572         struct TCP_Server_Info *server = tcon->ses->server;
3573         unsigned int written;
3574         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3575         struct cifs_credits credits = { .value = 0, .instance = 0 };
3576
3577         switch (mid->mid_state) {
3578         case MID_RESPONSE_RECEIVED:
3579                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3580                 credits.instance = server->reconnect_instance;
3581                 wdata->result = smb2_check_receive(mid, server, 0);
3582                 if (wdata->result != 0)
3583                         break;
3584
3585                 written = le32_to_cpu(rsp->DataLength);
3586                 /*
3587                  * Mask off high 16 bits when bytes written as returned
3588                  * by the server is greater than bytes requested by the
3589                  * client. OS/2 servers are known to set incorrect
3590                  * CountHigh values.
3591                  */
3592                 if (written > wdata->bytes)
3593                         written &= 0xFFFF;
3594
3595                 if (written < wdata->bytes)
3596                         wdata->result = -ENOSPC;
3597                 else
3598                         wdata->bytes = written;
3599                 break;
3600         case MID_REQUEST_SUBMITTED:
3601         case MID_RETRY_NEEDED:
3602                 wdata->result = -EAGAIN;
3603                 break;
3604         case MID_RESPONSE_MALFORMED:
3605                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3606                 credits.instance = server->reconnect_instance;
3607                 /* fall through */
3608         default:
3609                 wdata->result = -EIO;
3610                 break;
3611         }
3612 #ifdef CONFIG_CIFS_SMB_DIRECT
3613         /*
3614          * If this wdata has a memory registered, the MR can be freed
3615          * The number of MRs available is limited, it's important to recover
3616          * used MR as soon as I/O is finished. Hold MR longer in the later
3617          * I/O process can possibly result in I/O deadlock due to lack of MR
3618          * to send request on I/O retry
3619          */
3620         if (wdata->mr) {
3621                 smbd_deregister_mr(wdata->mr);
3622                 wdata->mr = NULL;
3623         }
3624 #endif
3625         if (wdata->result) {
3626                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3627                 trace_smb3_write_err(0 /* no xid */,
3628                                      wdata->cfile->fid.persistent_fid,
3629                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3630                                      wdata->bytes, wdata->result);
3631         } else
3632                 trace_smb3_write_done(0 /* no xid */,
3633                                       wdata->cfile->fid.persistent_fid,
3634                                       tcon->tid, tcon->ses->Suid,
3635                                       wdata->offset, wdata->bytes);
3636
3637         queue_work(cifsiod_wq, &wdata->work);
3638         DeleteMidQEntry(mid);
3639         add_credits(server, &credits, 0);
3640 }
3641
3642 /* smb2_async_writev - send an async write, and set up mid to handle result */
3643 int
3644 smb2_async_writev(struct cifs_writedata *wdata,
3645                   void (*release)(struct kref *kref))
3646 {
3647         int rc = -EACCES, flags = 0;
3648         struct smb2_write_req *req = NULL;
3649         struct smb2_sync_hdr *shdr;
3650         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3651         struct TCP_Server_Info *server = tcon->ses->server;
3652         struct kvec iov[1];
3653         struct smb_rqst rqst = { };
3654         unsigned int total_len;
3655
3656         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3657         if (rc)
3658                 return rc;
3659
3660         if (smb3_encryption_required(tcon))
3661                 flags |= CIFS_TRANSFORM_REQ;
3662
3663         shdr = (struct smb2_sync_hdr *)req;
3664         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3665
3666         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3667         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3668         req->WriteChannelInfoOffset = 0;
3669         req->WriteChannelInfoLength = 0;
3670         req->Channel = 0;
3671         req->Offset = cpu_to_le64(wdata->offset);
3672         req->DataOffset = cpu_to_le16(
3673                                 offsetof(struct smb2_write_req, Buffer));
3674         req->RemainingBytes = 0;
3675
3676         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
3677                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
3678 #ifdef CONFIG_CIFS_SMB_DIRECT
3679         /*
3680          * If we want to do a server RDMA read, fill in and append
3681          * smbd_buffer_descriptor_v1 to the end of write request
3682          */
3683         if (server->rdma && !server->sign && wdata->bytes >=
3684                 server->smbd_conn->rdma_readwrite_threshold) {
3685
3686                 struct smbd_buffer_descriptor_v1 *v1;
3687                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3688
3689                 wdata->mr = smbd_register_mr(
3690                                 server->smbd_conn, wdata->pages,
3691                                 wdata->nr_pages, wdata->page_offset,
3692                                 wdata->tailsz, false, need_invalidate);
3693                 if (!wdata->mr) {
3694                         rc = -EAGAIN;
3695                         goto async_writev_out;
3696                 }
3697                 req->Length = 0;
3698                 req->DataOffset = 0;
3699                 if (wdata->nr_pages > 1)
3700                         req->RemainingBytes =
3701                                 cpu_to_le32(
3702                                         (wdata->nr_pages - 1) * wdata->pagesz -
3703                                         wdata->page_offset + wdata->tailsz
3704                                 );
3705                 else
3706                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3707                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3708                 if (need_invalidate)
3709                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3710                 req->WriteChannelInfoOffset =
3711                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3712                 req->WriteChannelInfoLength =
3713                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3714                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3715                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3716                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3717                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3718         }
3719 #endif
3720         iov[0].iov_len = total_len - 1;
3721         iov[0].iov_base = (char *)req;
3722
3723         rqst.rq_iov = iov;
3724         rqst.rq_nvec = 1;
3725         rqst.rq_pages = wdata->pages;
3726         rqst.rq_offset = wdata->page_offset;
3727         rqst.rq_npages = wdata->nr_pages;
3728         rqst.rq_pagesz = wdata->pagesz;
3729         rqst.rq_tailsz = wdata->tailsz;
3730 #ifdef CONFIG_CIFS_SMB_DIRECT
3731         if (wdata->mr) {
3732                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3733                 rqst.rq_npages = 0;
3734         }
3735 #endif
3736         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3737                  wdata->offset, wdata->bytes);
3738
3739 #ifdef CONFIG_CIFS_SMB_DIRECT
3740         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3741         if (!wdata->mr)
3742                 req->Length = cpu_to_le32(wdata->bytes);
3743 #else
3744         req->Length = cpu_to_le32(wdata->bytes);
3745 #endif
3746
3747         if (wdata->credits.value > 0) {
3748                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3749                                                     SMB2_MAX_BUFFER_SIZE));
3750                 shdr->CreditRequest =
3751                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3752
3753                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
3754                 if (rc)
3755                         goto async_writev_out;
3756
3757                 flags |= CIFS_HAS_CREDITS;
3758         }
3759
3760         kref_get(&wdata->refcount);
3761         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3762                              wdata, flags, &wdata->credits);
3763
3764         if (rc) {
3765                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3766                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3767                                      wdata->bytes, rc);
3768                 kref_put(&wdata->refcount, release);
3769                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3770         }
3771
3772 async_writev_out:
3773         cifs_small_buf_release(req);
3774         return rc;
3775 }
3776
3777 /*
3778  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3779  * The length field from io_parms must be at least 1 and indicates a number of
3780  * elements with data to write that begins with position 1 in iov array. All
3781  * data length is specified by count.
3782  */
3783 int
3784 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3785            unsigned int *nbytes, struct kvec *iov, int n_vec)
3786 {
3787         struct smb_rqst rqst;
3788         int rc = 0;
3789         struct smb2_write_req *req = NULL;
3790         struct smb2_write_rsp *rsp = NULL;
3791         int resp_buftype;
3792         struct kvec rsp_iov;
3793         int flags = 0;
3794         unsigned int total_len;
3795
3796         *nbytes = 0;
3797
3798         if (n_vec < 1)
3799                 return rc;
3800
3801         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3802                              &total_len);
3803         if (rc)
3804                 return rc;
3805
3806         if (io_parms->tcon->ses->server == NULL)
3807                 return -ECONNABORTED;
3808
3809         if (smb3_encryption_required(io_parms->tcon))
3810                 flags |= CIFS_TRANSFORM_REQ;
3811
3812         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3813
3814         req->PersistentFileId = io_parms->persistent_fid;
3815         req->VolatileFileId = io_parms->volatile_fid;
3816         req->WriteChannelInfoOffset = 0;
3817         req->WriteChannelInfoLength = 0;
3818         req->Channel = 0;
3819         req->Length = cpu_to_le32(io_parms->length);
3820         req->Offset = cpu_to_le64(io_parms->offset);
3821         req->DataOffset = cpu_to_le16(
3822                                 offsetof(struct smb2_write_req, Buffer));
3823         req->RemainingBytes = 0;
3824
3825         trace_smb3_write_enter(xid, io_parms->persistent_fid,
3826                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3827                 io_parms->offset, io_parms->length);
3828
3829         iov[0].iov_base = (char *)req;
3830         /* 1 for Buffer */
3831         iov[0].iov_len = total_len - 1;
3832
3833         memset(&rqst, 0, sizeof(struct smb_rqst));
3834         rqst.rq_iov = iov;
3835         rqst.rq_nvec = n_vec + 1;
3836
3837         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3838                             &resp_buftype, flags, &rsp_iov);
3839         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3840
3841         if (rc) {
3842                 trace_smb3_write_err(xid, req->PersistentFileId,
3843                                      io_parms->tcon->tid,
3844                                      io_parms->tcon->ses->Suid,
3845                                      io_parms->offset, io_parms->length, rc);
3846                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3847                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3848         } else {
3849                 *nbytes = le32_to_cpu(rsp->DataLength);
3850                 trace_smb3_write_done(xid, req->PersistentFileId,
3851                                      io_parms->tcon->tid,
3852                                      io_parms->tcon->ses->Suid,
3853                                      io_parms->offset, *nbytes);
3854         }
3855
3856         cifs_small_buf_release(req);
3857         free_rsp_buf(resp_buftype, rsp);
3858         return rc;
3859 }
3860
3861 static unsigned int
3862 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3863 {
3864         int len;
3865         unsigned int entrycount = 0;
3866         unsigned int next_offset = 0;
3867         char *entryptr;
3868         FILE_DIRECTORY_INFO *dir_info;
3869
3870         if (bufstart == NULL)
3871                 return 0;
3872
3873         entryptr = bufstart;
3874
3875         while (1) {
3876                 if (entryptr + next_offset < entryptr ||
3877                     entryptr + next_offset > end_of_buf ||
3878                     entryptr + next_offset + size > end_of_buf) {
3879                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3880                         break;
3881                 }
3882
3883                 entryptr = entryptr + next_offset;
3884                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3885
3886                 len = le32_to_cpu(dir_info->FileNameLength);
3887                 if (entryptr + len < entryptr ||
3888                     entryptr + len > end_of_buf ||
3889                     entryptr + len + size > end_of_buf) {
3890                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3891                                  end_of_buf);
3892                         break;
3893                 }
3894
3895                 *lastentry = entryptr;
3896                 entrycount++;
3897
3898                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3899                 if (!next_offset)
3900                         break;
3901         }
3902
3903         return entrycount;
3904 }
3905
3906 /*
3907  * Readdir/FindFirst
3908  */
3909 int
3910 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3911                      u64 persistent_fid, u64 volatile_fid, int index,
3912                      struct cifs_search_info *srch_inf)
3913 {
3914         struct smb_rqst rqst;
3915         struct smb2_query_directory_req *req;
3916         struct smb2_query_directory_rsp *rsp = NULL;
3917         struct kvec iov[2];
3918         struct kvec rsp_iov;
3919         int rc = 0;
3920         int len;
3921         int resp_buftype = CIFS_NO_BUFFER;
3922         unsigned char *bufptr;
3923         struct TCP_Server_Info *server;
3924         struct cifs_ses *ses = tcon->ses;
3925         __le16 asteriks = cpu_to_le16('*');
3926         char *end_of_smb;
3927         unsigned int output_size = CIFSMaxBufSize;
3928         size_t info_buf_size;
3929         int flags = 0;
3930         unsigned int total_len;
3931
3932         if (ses && (ses->server))
3933                 server = ses->server;
3934         else
3935                 return -EIO;
3936
3937         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3938                              &total_len);
3939         if (rc)
3940                 return rc;
3941
3942         if (smb3_encryption_required(tcon))
3943                 flags |= CIFS_TRANSFORM_REQ;
3944
3945         switch (srch_inf->info_level) {
3946         case SMB_FIND_FILE_DIRECTORY_INFO:
3947                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3948                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3949                 break;
3950         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3951                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3952                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3953                 break;
3954         default:
3955                 cifs_dbg(VFS, "info level %u isn't supported\n",
3956                          srch_inf->info_level);
3957                 rc = -EINVAL;
3958                 goto qdir_exit;
3959         }
3960
3961         req->FileIndex = cpu_to_le32(index);
3962         req->PersistentFileId = persistent_fid;
3963         req->VolatileFileId = volatile_fid;
3964
3965         len = 0x2;
3966         bufptr = req->Buffer;
3967         memcpy(bufptr, &asteriks, len);
3968
3969         req->FileNameOffset =
3970                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3971         req->FileNameLength = cpu_to_le16(len);
3972         /*
3973          * BB could be 30 bytes or so longer if we used SMB2 specific
3974          * buffer lengths, but this is safe and close enough.
3975          */
3976         output_size = min_t(unsigned int, output_size, server->maxBuf);
3977         output_size = min_t(unsigned int, output_size, 2 << 15);
3978         req->OutputBufferLength = cpu_to_le32(output_size);
3979
3980         iov[0].iov_base = (char *)req;
3981         /* 1 for Buffer */
3982         iov[0].iov_len = total_len - 1;
3983
3984         iov[1].iov_base = (char *)(req->Buffer);
3985         iov[1].iov_len = len;
3986
3987         memset(&rqst, 0, sizeof(struct smb_rqst));
3988         rqst.rq_iov = iov;
3989         rqst.rq_nvec = 2;
3990
3991         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
3992                         tcon->ses->Suid, index, output_size);
3993
3994         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3995         cifs_small_buf_release(req);
3996         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3997
3998         if (rc) {
3999                 if (rc == -ENODATA &&
4000                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4001                         trace_smb3_query_dir_done(xid, persistent_fid,
4002                                 tcon->tid, tcon->ses->Suid, index, 0);
4003                         srch_inf->endOfSearch = true;
4004                         rc = 0;
4005                 } else {
4006                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4007                                 tcon->ses->Suid, index, 0, rc);
4008                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4009                 }
4010                 goto qdir_exit;
4011         }
4012
4013         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4014                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4015                                info_buf_size);
4016         if (rc) {
4017                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4018                         tcon->ses->Suid, index, 0, rc);
4019                 goto qdir_exit;
4020         }
4021
4022         srch_inf->unicode = true;
4023
4024         if (srch_inf->ntwrk_buf_start) {
4025                 if (srch_inf->smallBuf)
4026                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4027                 else
4028                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4029         }
4030         srch_inf->ntwrk_buf_start = (char *)rsp;
4031         srch_inf->srch_entries_start = srch_inf->last_entry =
4032                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4033         end_of_smb = rsp_iov.iov_len + (char *)rsp;
4034         srch_inf->entries_in_buffer =
4035                         num_entries(srch_inf->srch_entries_start, end_of_smb,
4036                                     &srch_inf->last_entry, info_buf_size);
4037         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4038         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4039                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4040                  srch_inf->srch_entries_start, srch_inf->last_entry);
4041         if (resp_buftype == CIFS_LARGE_BUFFER)
4042                 srch_inf->smallBuf = false;
4043         else if (resp_buftype == CIFS_SMALL_BUFFER)
4044                 srch_inf->smallBuf = true;
4045         else
4046                 cifs_dbg(VFS, "illegal search buffer type\n");
4047
4048         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4049                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4050         return rc;
4051
4052 qdir_exit:
4053         free_rsp_buf(resp_buftype, rsp);
4054         return rc;
4055 }
4056
4057 int
4058 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
4059                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4060                u8 info_type, u32 additional_info,
4061                 void **data, unsigned int *size)
4062 {
4063         struct smb2_set_info_req *req;
4064         struct kvec *iov = rqst->rq_iov;
4065         unsigned int i, total_len;
4066         int rc;
4067
4068         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
4069         if (rc)
4070                 return rc;
4071
4072         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4073         req->InfoType = info_type;
4074         req->FileInfoClass = info_class;
4075         req->PersistentFileId = persistent_fid;
4076         req->VolatileFileId = volatile_fid;
4077         req->AdditionalInformation = cpu_to_le32(additional_info);
4078
4079         req->BufferOffset =
4080                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4081         req->BufferLength = cpu_to_le32(*size);
4082
4083         memcpy(req->Buffer, *data, *size);
4084         total_len += *size;
4085
4086         iov[0].iov_base = (char *)req;
4087         /* 1 for Buffer */
4088         iov[0].iov_len = total_len - 1;
4089
4090         for (i = 1; i < rqst->rq_nvec; i++) {
4091                 le32_add_cpu(&req->BufferLength, size[i]);
4092                 iov[i].iov_base = (char *)data[i];
4093                 iov[i].iov_len = size[i];
4094         }
4095
4096         return 0;
4097 }
4098
4099 void
4100 SMB2_set_info_free(struct smb_rqst *rqst)
4101 {
4102         if (rqst && rqst->rq_iov)
4103                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4104 }
4105
4106 static int
4107 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4108                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4109                u8 info_type, u32 additional_info, unsigned int num,
4110                 void **data, unsigned int *size)
4111 {
4112         struct smb_rqst rqst;
4113         struct smb2_set_info_rsp *rsp = NULL;
4114         struct kvec *iov;
4115         struct kvec rsp_iov;
4116         int rc = 0;
4117         int resp_buftype;
4118         struct cifs_ses *ses = tcon->ses;
4119         int flags = 0;
4120
4121         if (!ses || !(ses->server))
4122                 return -EIO;
4123
4124         if (!num)
4125                 return -EINVAL;
4126
4127         if (smb3_encryption_required(tcon))
4128                 flags |= CIFS_TRANSFORM_REQ;
4129
4130         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4131         if (!iov)
4132                 return -ENOMEM;
4133
4134         memset(&rqst, 0, sizeof(struct smb_rqst));
4135         rqst.rq_iov = iov;
4136         rqst.rq_nvec = num;
4137
4138         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4139                                 info_class, info_type, additional_info,
4140                                 data, size);
4141         if (rc) {
4142                 kfree(iov);
4143                 return rc;
4144         }
4145
4146
4147         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4148                             &rsp_iov);
4149         SMB2_set_info_free(&rqst);
4150         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4151
4152         if (rc != 0) {
4153                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4154                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4155                                 ses->Suid, info_class, (__u32)info_type, rc);
4156         }
4157
4158         free_rsp_buf(resp_buftype, rsp);
4159         kfree(iov);
4160         return rc;
4161 }
4162
4163 int
4164 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4165              u64 volatile_fid, u32 pid, __le64 *eof)
4166 {
4167         struct smb2_file_eof_info info;
4168         void *data;
4169         unsigned int size;
4170
4171         info.EndOfFile = *eof;
4172
4173         data = &info;
4174         size = sizeof(struct smb2_file_eof_info);
4175
4176         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4177                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4178                         0, 1, &data, &size);
4179 }
4180
4181 int
4182 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4183                 u64 persistent_fid, u64 volatile_fid,
4184                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4185 {
4186         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4187                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4188                         1, (void **)&pnntsd, &pacllen);
4189 }
4190
4191 int
4192 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4193             u64 persistent_fid, u64 volatile_fid,
4194             struct smb2_file_full_ea_info *buf, int len)
4195 {
4196         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4197                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4198                 0, 1, (void **)&buf, &len);
4199 }
4200
4201 int
4202 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4203                   const u64 persistent_fid, const u64 volatile_fid,
4204                   __u8 oplock_level)
4205 {
4206         struct smb_rqst rqst;
4207         int rc;
4208         struct smb2_oplock_break *req = NULL;
4209         struct cifs_ses *ses = tcon->ses;
4210         int flags = CIFS_OBREAK_OP;
4211         unsigned int total_len;
4212         struct kvec iov[1];
4213         struct kvec rsp_iov;
4214         int resp_buf_type;
4215
4216         cifs_dbg(FYI, "SMB2_oplock_break\n");
4217         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4218                              &total_len);
4219         if (rc)
4220                 return rc;
4221
4222         if (smb3_encryption_required(tcon))
4223                 flags |= CIFS_TRANSFORM_REQ;
4224
4225         req->VolatileFid = volatile_fid;
4226         req->PersistentFid = persistent_fid;
4227         req->OplockLevel = oplock_level;
4228         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4229
4230         flags |= CIFS_NO_RSP_BUF;
4231
4232         iov[0].iov_base = (char *)req;
4233         iov[0].iov_len = total_len;
4234
4235         memset(&rqst, 0, sizeof(struct smb_rqst));
4236         rqst.rq_iov = iov;
4237         rqst.rq_nvec = 1;
4238
4239         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4240         cifs_small_buf_release(req);
4241
4242         if (rc) {
4243                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4244                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4245         }
4246
4247         return rc;
4248 }
4249
4250 void
4251 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4252                              struct kstatfs *kst)
4253 {
4254         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4255                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4256         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4257         kst->f_bfree  = kst->f_bavail =
4258                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4259         return;
4260 }
4261
4262 static void
4263 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4264                         struct kstatfs *kst)
4265 {
4266         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4267         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4268         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4269         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4270                 kst->f_bavail = kst->f_bfree;
4271         else
4272                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4273         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4274                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4275         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4276                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4277
4278         return;
4279 }
4280
4281 static int
4282 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4283                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4284 {
4285         int rc;
4286         struct smb2_query_info_req *req;
4287         unsigned int total_len;
4288
4289         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4290
4291         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4292                 return -EIO;
4293
4294         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4295                              &total_len);
4296         if (rc)
4297                 return rc;
4298
4299         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4300         req->FileInfoClass = level;
4301         req->PersistentFileId = persistent_fid;
4302         req->VolatileFileId = volatile_fid;
4303         /* 1 for pad */
4304         req->InputBufferOffset =
4305                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4306         req->OutputBufferLength = cpu_to_le32(
4307                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4308
4309         iov->iov_base = (char *)req;
4310         iov->iov_len = total_len;
4311         return 0;
4312 }
4313
4314 int
4315 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4316               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4317 {
4318         struct smb_rqst rqst;
4319         struct smb2_query_info_rsp *rsp = NULL;
4320         struct kvec iov;
4321         struct kvec rsp_iov;
4322         int rc = 0;
4323         int resp_buftype;
4324         struct cifs_ses *ses = tcon->ses;
4325         FILE_SYSTEM_POSIX_INFO *info = NULL;
4326         int flags = 0;
4327
4328         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4329                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4330                                 persistent_fid, volatile_fid);
4331         if (rc)
4332                 return rc;
4333
4334         if (smb3_encryption_required(tcon))
4335                 flags |= CIFS_TRANSFORM_REQ;
4336
4337         memset(&rqst, 0, sizeof(struct smb_rqst));
4338         rqst.rq_iov = &iov;
4339         rqst.rq_nvec = 1;
4340
4341         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4342         cifs_small_buf_release(iov.iov_base);
4343         if (rc) {
4344                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4345                 goto posix_qfsinf_exit;
4346         }
4347         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4348
4349         info = (FILE_SYSTEM_POSIX_INFO *)(
4350                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4351         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4352                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4353                                sizeof(FILE_SYSTEM_POSIX_INFO));
4354         if (!rc)
4355                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4356
4357 posix_qfsinf_exit:
4358         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4359         return rc;
4360 }
4361
4362 int
4363 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4364               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4365 {
4366         struct smb_rqst rqst;
4367         struct smb2_query_info_rsp *rsp = NULL;
4368         struct kvec iov;
4369         struct kvec rsp_iov;
4370         int rc = 0;
4371         int resp_buftype;
4372         struct cifs_ses *ses = tcon->ses;
4373         struct smb2_fs_full_size_info *info = NULL;
4374         int flags = 0;
4375
4376         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4377                                 sizeof(struct smb2_fs_full_size_info),
4378                                 persistent_fid, volatile_fid);
4379         if (rc)
4380                 return rc;
4381
4382         if (smb3_encryption_required(tcon))
4383                 flags |= CIFS_TRANSFORM_REQ;
4384
4385         memset(&rqst, 0, sizeof(struct smb_rqst));
4386         rqst.rq_iov = &iov;
4387         rqst.rq_nvec = 1;
4388
4389         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4390         cifs_small_buf_release(iov.iov_base);
4391         if (rc) {
4392                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4393                 goto qfsinf_exit;
4394         }
4395         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4396
4397         info = (struct smb2_fs_full_size_info *)(
4398                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4399         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4400                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4401                                sizeof(struct smb2_fs_full_size_info));
4402         if (!rc)
4403                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4404
4405 qfsinf_exit:
4406         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4407         return rc;
4408 }
4409
4410 int
4411 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4412               u64 persistent_fid, u64 volatile_fid, int level)
4413 {
4414         struct smb_rqst rqst;
4415         struct smb2_query_info_rsp *rsp = NULL;
4416         struct kvec iov;
4417         struct kvec rsp_iov;
4418         int rc = 0;
4419         int resp_buftype, max_len, min_len;
4420         struct cifs_ses *ses = tcon->ses;
4421         unsigned int rsp_len, offset;
4422         int flags = 0;
4423
4424         if (level == FS_DEVICE_INFORMATION) {
4425                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4426                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4427         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4428                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4429                 min_len = MIN_FS_ATTR_INFO_SIZE;
4430         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4431                 max_len = sizeof(struct smb3_fs_ss_info);
4432                 min_len = sizeof(struct smb3_fs_ss_info);
4433         } else if (level == FS_VOLUME_INFORMATION) {
4434                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4435                 min_len = sizeof(struct smb3_fs_vol_info);
4436         } else {
4437                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4438                 return -EINVAL;
4439         }
4440
4441         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4442                                 persistent_fid, volatile_fid);
4443         if (rc)
4444                 return rc;
4445
4446         if (smb3_encryption_required(tcon))
4447                 flags |= CIFS_TRANSFORM_REQ;
4448
4449         memset(&rqst, 0, sizeof(struct smb_rqst));
4450         rqst.rq_iov = &iov;
4451         rqst.rq_nvec = 1;
4452
4453         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4454         cifs_small_buf_release(iov.iov_base);
4455         if (rc) {
4456                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4457                 goto qfsattr_exit;
4458         }
4459         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4460
4461         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4462         offset = le16_to_cpu(rsp->OutputBufferOffset);
4463         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4464         if (rc)
4465                 goto qfsattr_exit;
4466
4467         if (level == FS_ATTRIBUTE_INFORMATION)
4468                 memcpy(&tcon->fsAttrInfo, offset
4469                         + (char *)rsp, min_t(unsigned int,
4470                         rsp_len, max_len));
4471         else if (level == FS_DEVICE_INFORMATION)
4472                 memcpy(&tcon->fsDevInfo, offset
4473                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4474         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4475                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4476                         (offset + (char *)rsp);
4477                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4478                 tcon->perf_sector_size =
4479                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4480         } else if (level == FS_VOLUME_INFORMATION) {
4481                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4482                         (offset + (char *)rsp);
4483                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4484                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4485         }
4486
4487 qfsattr_exit:
4488         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4489         return rc;
4490 }
4491
4492 int
4493 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4494            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4495            const __u32 num_lock, struct smb2_lock_element *buf)
4496 {
4497         struct smb_rqst rqst;
4498         int rc = 0;
4499         struct smb2_lock_req *req = NULL;
4500         struct kvec iov[2];
4501         struct kvec rsp_iov;
4502         int resp_buf_type;
4503         unsigned int count;
4504         int flags = CIFS_NO_RSP_BUF;
4505         unsigned int total_len;
4506
4507         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4508
4509         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4510         if (rc)
4511                 return rc;
4512
4513         if (smb3_encryption_required(tcon))
4514                 flags |= CIFS_TRANSFORM_REQ;
4515
4516         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4517         req->LockCount = cpu_to_le16(num_lock);
4518
4519         req->PersistentFileId = persist_fid;
4520         req->VolatileFileId = volatile_fid;
4521
4522         count = num_lock * sizeof(struct smb2_lock_element);
4523
4524         iov[0].iov_base = (char *)req;
4525         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4526         iov[1].iov_base = (char *)buf;
4527         iov[1].iov_len = count;
4528
4529         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4530
4531         memset(&rqst, 0, sizeof(struct smb_rqst));
4532         rqst.rq_iov = iov;
4533         rqst.rq_nvec = 2;
4534
4535         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4536                             &rsp_iov);
4537         cifs_small_buf_release(req);
4538         if (rc) {
4539                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4540                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4541                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4542                                     tcon->ses->Suid, rc);
4543         }
4544
4545         return rc;
4546 }
4547
4548 int
4549 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4550           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4551           const __u64 length, const __u64 offset, const __u32 lock_flags,
4552           const bool wait)
4553 {
4554         struct smb2_lock_element lock;
4555
4556         lock.Offset = cpu_to_le64(offset);
4557         lock.Length = cpu_to_le64(length);
4558         lock.Flags = cpu_to_le32(lock_flags);
4559         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4560                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4561
4562         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4563 }
4564
4565 int
4566 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4567                  __u8 *lease_key, const __le32 lease_state)
4568 {
4569         struct smb_rqst rqst;
4570         int rc;
4571         struct smb2_lease_ack *req = NULL;
4572         struct cifs_ses *ses = tcon->ses;
4573         int flags = CIFS_OBREAK_OP;
4574         unsigned int total_len;
4575         struct kvec iov[1];
4576         struct kvec rsp_iov;
4577         int resp_buf_type;
4578         __u64 *please_key_high;
4579         __u64 *please_key_low;
4580
4581         cifs_dbg(FYI, "SMB2_lease_break\n");
4582         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4583                              &total_len);
4584         if (rc)
4585                 return rc;
4586
4587         if (smb3_encryption_required(tcon))
4588                 flags |= CIFS_TRANSFORM_REQ;
4589
4590         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4591         req->StructureSize = cpu_to_le16(36);
4592         total_len += 12;
4593
4594         memcpy(req->LeaseKey, lease_key, 16);
4595         req->LeaseState = lease_state;
4596
4597         flags |= CIFS_NO_RSP_BUF;
4598
4599         iov[0].iov_base = (char *)req;
4600         iov[0].iov_len = total_len;
4601
4602         memset(&rqst, 0, sizeof(struct smb_rqst));
4603         rqst.rq_iov = iov;
4604         rqst.rq_nvec = 1;
4605
4606         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4607         cifs_small_buf_release(req);
4608
4609         please_key_low = (__u64 *)lease_key;
4610         please_key_high = (__u64 *)(lease_key+8);
4611         if (rc) {
4612                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4613                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4614                         ses->Suid, *please_key_low, *please_key_high, rc);
4615                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4616         } else
4617                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4618                         ses->Suid, *please_key_low, *please_key_high);
4619
4620         return rc;
4621 }