fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French ([email protected])
   7  *              Pavel Shilovsky ([email protected]) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon)
 102 {
 103         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 104         shdr->StructureSize = cpu_to_le16(64);
 105         shdr->Command = smb2_cmd;
 106         if (tcon && tcon->ses && tcon->ses->server) {
 107                 struct TCP_Server_Info *server = tcon->ses->server;
 108
 109                 spin_lock(&server->req_lock);
 110                 /* Request up to 2 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, 2));
 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                 snprintf(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                 snprintf(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
 463 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 464 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 465 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 466
 467 static void
 468 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 469 {
 470         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 471         pneg_ctxt->DataLength = cpu_to_le16(38);
 472         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 473         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 474         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 475         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 476 }
 477
 478 static void
 479 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 480 {
 481         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 482         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 483         pneg_ctxt->CipherCount = cpu_to_le16(1);
 484 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 485         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 486 }
 487
 488 static void
 489 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 490 {
 491         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 492         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 493 }
 494
 495 static void
 496 assemble_neg_contexts(struct smb2_negotiate_req *req,
 497                       unsigned int *total_len)
 498 {
 499         char *pneg_ctxt = (char *)req;
 500         unsigned int ctxt_len;
 501
 502         if (*total_len > 200) {
 503                 /* In case length corrupted don't want to overrun smb buffer */
 504                 cifs_dbg(VFS, "Bad frame length assembling neg contexts\n");
 505                 return;
 506         }
 507
 508         /*
 509          * round up total_len of fixed part of SMB3 negotiate request to 8
 510          * byte boundary before adding negotiate contexts
 511          */
 512         *total_len = roundup(*total_len, 8);
 513
 514         pneg_ctxt = (*total_len) + (char *)req;
 515         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 516
 517         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 518         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 519         *total_len += ctxt_len;
 520         pneg_ctxt += ctxt_len;
 521
 522         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 523         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 524         *total_len += ctxt_len;
 525         pneg_ctxt += ctxt_len;
 526
 527         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 528         *total_len += sizeof(struct smb2_posix_neg_context);
 529
 530         req->NegotiateContextCount = cpu_to_le16(3);
 531 }
 532
 533 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 534 {
 535         unsigned int len = le16_to_cpu(ctxt->DataLength);
 536
 537         /* If invalid preauth context warn but use what we requested, SHA-512 */
 538         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 539                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 540                 return;
 541         }
 542         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 543                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 544         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 545                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 546 }
 547
 548 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 549                               struct smb2_encryption_neg_context *ctxt)
 550 {
 551         unsigned int len = le16_to_cpu(ctxt->DataLength);
 552
 553         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 554         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 555                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 556                 return -EINVAL;
 557         }
 558
 559         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 560                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 561                 return -EINVAL;
 562         }
 563         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 564         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 565             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 566                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 567                 return -EINVAL;
 568         }
 569         server->cipher_type = ctxt->Ciphers[0];
 570         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 571         return 0;
 572 }
 573
 574 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 575                                      struct TCP_Server_Info *server,
 576                                      unsigned int len_of_smb)
 577 {
 578         struct smb2_neg_context *pctx;
 579         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 580         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 581         unsigned int len_of_ctxts, i;
 582         int rc = 0;
 583
 584         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 585         if (len_of_smb <= offset) {
 586                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 587                 return -EINVAL;
 588         }
 589
 590         len_of_ctxts = len_of_smb - offset;
 591
 592         for (i = 0; i < ctxt_cnt; i++) {
 593                 int clen;
 594                 /* check that offset is not beyond end of SMB */
 595                 if (len_of_ctxts == 0)
 596                         break;
 597
 598                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 599                         break;
 600
 601                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 602                 clen = le16_to_cpu(pctx->DataLength);
 603                 if (clen > len_of_ctxts)
 604                         break;
 605
 606                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 607                         decode_preauth_context(
 608                                 (struct smb2_preauth_neg_context *)pctx);
 609                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 610                         rc = decode_encrypt_ctx(server,
 611                                 (struct smb2_encryption_neg_context *)pctx);
 612                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 613                         server->posix_ext_supported = true;
 614                 else
 615                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 616                                 le16_to_cpu(pctx->ContextType));
 617
 618                 if (rc)
 619                         break;
 620                 /* offsets must be 8 byte aligned */
 621                 clen = (clen + 7) & ~0x7;
 622                 offset += clen + sizeof(struct smb2_neg_context);
 623                 len_of_ctxts -= clen;
 624         }
 625         return rc;
 626 }
 627
 628 static struct create_posix *
 629 create_posix_buf(umode_t mode)
 630 {
 631         struct create_posix *buf;
 632
 633         buf = kzalloc(sizeof(struct create_posix),
 634                         GFP_KERNEL);
 635         if (!buf)
 636                 return NULL;
 637
 638         buf->ccontext.DataOffset =
 639                 cpu_to_le16(offsetof(struct create_posix, Mode));
 640         buf->ccontext.DataLength = cpu_to_le32(4);
 641         buf->ccontext.NameOffset =
 642                 cpu_to_le16(offsetof(struct create_posix, Name));
 643         buf->ccontext.NameLength = cpu_to_le16(16);
 644
 645         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 646         buf->Name[0] = 0x93;
 647         buf->Name[1] = 0xAD;
 648         buf->Name[2] = 0x25;
 649         buf->Name[3] = 0x50;
 650         buf->Name[4] = 0x9C;
 651         buf->Name[5] = 0xB4;
 652         buf->Name[6] = 0x11;
 653         buf->Name[7] = 0xE7;
 654         buf->Name[8] = 0xB4;
 655         buf->Name[9] = 0x23;
 656         buf->Name[10] = 0x83;
 657         buf->Name[11] = 0xDE;
 658         buf->Name[12] = 0x96;
 659         buf->Name[13] = 0x8B;
 660         buf->Name[14] = 0xCD;
 661         buf->Name[15] = 0x7C;
 662         buf->Mode = cpu_to_le32(mode);
 663         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 664         return buf;
 665 }
 666
 667 static int
 668 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 669 {
 670         struct smb2_create_req *req = iov[0].iov_base;
 671         unsigned int num = *num_iovec;
 672
 673         iov[num].iov_base = create_posix_buf(mode);
 674         if (iov[num].iov_base == NULL)
 675                 return -ENOMEM;
 676         iov[num].iov_len = sizeof(struct create_posix);
 677         if (!req->CreateContextsOffset)
 678                 req->CreateContextsOffset = cpu_to_le32(
 679                                 sizeof(struct smb2_create_req) +
 680                                 iov[num - 1].iov_len);
 681         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 682         *num_iovec = num + 1;
 683         return 0;
 684 }
 685
 686
 687 /*
 688  *
 689  *      SMB2 Worker functions follow:
 690  *
 691  *      The general structure of the worker functions is:
 692  *      1) Call smb2_init (assembles SMB2 header)
 693  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 694  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 695  *      4) Decode SMB2 command specific fields in the fixed length area
 696  *      5) Decode variable length data area (if any for this SMB2 command type)
 697  *      6) Call free smb buffer
 698  *      7) return
 699  *
 700  */
 701
 702 int
 703 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 704 {
 705         struct smb_rqst rqst;
 706         struct smb2_negotiate_req *req;
 707         struct smb2_negotiate_rsp *rsp;
 708         struct kvec iov[1];
 709         struct kvec rsp_iov;
 710         int rc = 0;
 711         int resp_buftype;
 712         struct TCP_Server_Info *server = ses->server;
 713         int blob_offset, blob_length;
 714         char *security_blob;
 715         int flags = CIFS_NEG_OP;
 716         unsigned int total_len;
 717
 718         cifs_dbg(FYI, "Negotiate protocol\n");
 719
 720         if (!server) {
 721                 WARN(1, "%s: server is NULL!\n", __func__);
 722                 return -EIO;
 723         }
 724
 725         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 726         if (rc)
 727                 return rc;
 728
 729         req->sync_hdr.SessionId = 0;
 730
 731         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 732         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 733
 734         if (strcmp(ses->server->vals->version_string,
 735                    SMB3ANY_VERSION_STRING) == 0) {
 736                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 737                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 738                 req->DialectCount = cpu_to_le16(2);
 739                 total_len += 4;
 740         } else if (strcmp(ses->server->vals->version_string,
 741                    SMBDEFAULT_VERSION_STRING) == 0) {
 742                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 743                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 744                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 745                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 746                 req->DialectCount = cpu_to_le16(4);
 747                 total_len += 8;
 748         } else {
 749                 /* otherwise send specific dialect */
 750                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 751                 req->DialectCount = cpu_to_le16(1);
 752                 total_len += 2;
 753         }
 754
 755         /* only one of SMB2 signing flags may be set in SMB2 request */
 756         if (ses->sign)
 757                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 758         else if (global_secflags & CIFSSEC_MAY_SIGN)
 759                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 760         else
 761                 req->SecurityMode = 0;
 762
 763         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 764
 765         /* ClientGUID must be zero for SMB2.02 dialect */
 766         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 767                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 768         else {
 769                 memcpy(req->ClientGUID, server->client_guid,
 770                         SMB2_CLIENT_GUID_SIZE);
 771                 if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
 772                     (strcmp(ses->server->vals->version_string,
 773                      SMBDEFAULT_VERSION_STRING) == 0))
 774                         assemble_neg_contexts(req, &total_len);
 775         }
 776         iov[0].iov_base = (char *)req;
 777         iov[0].iov_len = total_len;
 778
 779         memset(&rqst, 0, sizeof(struct smb_rqst));
 780         rqst.rq_iov = iov;
 781         rqst.rq_nvec = 1;
 782
 783         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 784         cifs_small_buf_release(req);
 785         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 786         /*
 787          * No tcon so can't do
 788          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 789          */
 790         if (rc == -EOPNOTSUPP) {
 791                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 792                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 793                         " older servers\n");
 794                 goto neg_exit;
 795         } else if (rc != 0)
 796                 goto neg_exit;
 797
 798         if (strcmp(ses->server->vals->version_string,
 799                    SMB3ANY_VERSION_STRING) == 0) {
 800                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 801                         cifs_dbg(VFS,
 802                                 "SMB2 dialect returned but not requested\n");
 803                         return -EIO;
 804                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 805                         cifs_dbg(VFS,
 806                                 "SMB2.1 dialect returned but not requested\n");
 807                         return -EIO;
 808                 }
 809         } else if (strcmp(ses->server->vals->version_string,
 810                    SMBDEFAULT_VERSION_STRING) == 0) {
 811                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 812                         cifs_dbg(VFS,
 813                                 "SMB2 dialect returned but not requested\n");
 814                         return -EIO;
 815                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 816                         /* ops set to 3.0 by default for default so update */
 817                         ses->server->ops = &smb21_operations;
 818                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 819                         ses->server->ops = &smb311_operations;
 820         } else if (le16_to_cpu(rsp->DialectRevision) !=
 821                                 ses->server->vals->protocol_id) {
 822                 /* if requested single dialect ensure returned dialect matched */
 823                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 824                         le16_to_cpu(rsp->DialectRevision));
 825                 return -EIO;
 826         }
 827
 828         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 829
 830         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 831                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 832         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 833                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 834         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 835                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 836         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 837                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 838         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 839                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 840         else {
 841                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 842                          le16_to_cpu(rsp->DialectRevision));
 843                 rc = -EIO;
 844                 goto neg_exit;
 845         }
 846         server->dialect = le16_to_cpu(rsp->DialectRevision);
 847
 848         /*
 849          * Keep a copy of the hash after negprot. This hash will be
 850          * the starting hash value for all sessions made from this
 851          * server.
 852          */
 853         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 854                SMB2_PREAUTH_HASH_SIZE);
 855
 856         /* SMB2 only has an extended negflavor */
 857         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 858         /* set it to the maximum buffer size value we can send with 1 credit */
 859         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 860                                SMB2_MAX_BUFFER_SIZE);
 861         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 862         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 863         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 864         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 865                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 866                                 server->sec_mode);
 867         server->capabilities = le32_to_cpu(rsp->Capabilities);
 868         /* Internal types */
 869         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 870
 871         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 872                                                (struct smb2_sync_hdr *)rsp);
 873         /*
 874          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 875          * for us will be
 876          *      ses->sectype = RawNTLMSSP;
 877          * but for time being this is our only auth choice so doesn't matter.
 878          * We just found a server which sets blob length to zero expecting raw.
 879          */
 880         if (blob_length == 0) {
 881                 cifs_dbg(FYI, "missing security blob on negprot\n");
 882                 server->sec_ntlmssp = true;
 883         }
 884
 885         rc = cifs_enable_signing(server, ses->sign);
 886         if (rc)
 887                 goto neg_exit;
 888         if (blob_length) {
 889                 rc = decode_negTokenInit(security_blob, blob_length, server);
 890                 if (rc == 1)
 891                         rc = 0;
 892                 else if (rc == 0)
 893                         rc = -EIO;
 894         }
 895
 896         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 897                 if (rsp->NegotiateContextCount)
 898                         rc = smb311_decode_neg_context(rsp, server,
 899                                                        rsp_iov.iov_len);
 900                 else
 901                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 902         }
 903 neg_exit:
 904         free_rsp_buf(resp_buftype, rsp);
 905         return rc;
 906 }
 907
 908 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 909 {
 910         int rc;
 911         struct validate_negotiate_info_req *pneg_inbuf;
 912         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 913         u32 rsplen;
 914         u32 inbuflen; /* max of 4 dialects */
 915
 916         cifs_dbg(FYI, "validate negotiate\n");
 917
 918         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 919         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 920                 return 0;
 921
 922         /*
 923          * validation ioctl must be signed, so no point sending this if we
 924          * can not sign it (ie are not known user).  Even if signing is not
 925          * required (enabled but not negotiated), in those cases we selectively
 926          * sign just this, the first and only signed request on a connection.
 927          * Having validation of negotiate info  helps reduce attack vectors.
 928          */
 929         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 930                 return 0; /* validation requires signing */
 931
 932         if (tcon->ses->user_name == NULL) {
 933                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 934                 return 0; /* validation requires signing */
 935         }
 936
 937         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 938                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 939
 940         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 941         if (!pneg_inbuf)
 942                 return -ENOMEM;
 943
 944         pneg_inbuf->Capabilities =
 945                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 946         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 947                                         SMB2_CLIENT_GUID_SIZE);
 948
 949         if (tcon->ses->sign)
 950                 pneg_inbuf->SecurityMode =
 951                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 952         else if (global_secflags & CIFSSEC_MAY_SIGN)
 953                 pneg_inbuf->SecurityMode =
 954                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 955         else
 956                 pneg_inbuf->SecurityMode = 0;
 957
 958
 959         if (strcmp(tcon->ses->server->vals->version_string,
 960                 SMB3ANY_VERSION_STRING) == 0) {
 961                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 962                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 963                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 964                 /* structure is big enough for 3 dialects, sending only 2 */
 965                 inbuflen = sizeof(*pneg_inbuf) -
 966                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
 967         } else if (strcmp(tcon->ses->server->vals->version_string,
 968                 SMBDEFAULT_VERSION_STRING) == 0) {
 969                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 970                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 971                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 972                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 973                 pneg_inbuf->DialectCount = cpu_to_le16(4);
 974                 /* structure is big enough for 3 dialects */
 975                 inbuflen = sizeof(*pneg_inbuf);
 976         } else {
 977                 /* otherwise specific dialect was requested */
 978                 pneg_inbuf->Dialects[0] =
 979                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 980                 pneg_inbuf->DialectCount = cpu_to_le16(1);
 981                 /* structure is big enough for 3 dialects, sending only 1 */
 982                 inbuflen = sizeof(*pneg_inbuf) -
 983                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
 984         }
 985
 986         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 987                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 988                 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
 989
 990         if (rc != 0) {
 991                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 992                 rc = -EIO;
 993                 goto out_free_inbuf;
 994         }
 995
 996         rc = -EIO;
 997         if (rsplen != sizeof(*pneg_rsp)) {
 998                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 999                          rsplen);
1000
1001                 /* relax check since Mac returns max bufsize allowed on ioctl */
1002                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1003                         goto out_free_rsp;
1004         }
1005
1006         /* check validate negotiate info response matches what we got earlier */
1007         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
1008                 goto vneg_out;
1009
1010         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
1011                 goto vneg_out;
1012
1013         /* do not validate server guid because not saved at negprot time yet */
1014
1015         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1016               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
1017                 goto vneg_out;
1018
1019         /* validate negotiate successful */
1020         rc = 0;
1021         cifs_dbg(FYI, "validate negotiate info successful\n");
1022         goto out_free_rsp;
1023
1024 vneg_out:
1025         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1026 out_free_rsp:
1027         kfree(pneg_rsp);
1028 out_free_inbuf:
1029         kfree(pneg_inbuf);
1030         return rc;
1031 }
1032
1033 enum securityEnum
1034 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1035 {
1036         switch (requested) {
1037         case Kerberos:
1038         case RawNTLMSSP:
1039                 return requested;
1040         case NTLMv2:
1041                 return RawNTLMSSP;
1042         case Unspecified:
1043                 if (server->sec_ntlmssp &&
1044                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1045                         return RawNTLMSSP;
1046                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1047                         (global_secflags & CIFSSEC_MAY_KRB5))
1048                         return Kerberos;
1049                 /* Fallthrough */
1050         default:
1051                 return Unspecified;
1052         }
1053 }
1054
1055 struct SMB2_sess_data {
1056         unsigned int xid;
1057         struct cifs_ses *ses;
1058         struct nls_table *nls_cp;
1059         void (*func)(struct SMB2_sess_data *);
1060         int result;
1061         u64 previous_session;
1062
1063         /* we will send the SMB in three pieces:
1064          * a fixed length beginning part, an optional
1065          * SPNEGO blob (which can be zero length), and a
1066          * last part which will include the strings
1067          * and rest of bcc area. This allows us to avoid
1068          * a large buffer 17K allocation
1069          */
1070         int buf0_type;
1071         struct kvec iov[2];
1072 };
1073
1074 static int
1075 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1076 {
1077         int rc;
1078         struct cifs_ses *ses = sess_data->ses;
1079         struct smb2_sess_setup_req *req;
1080         struct TCP_Server_Info *server = ses->server;
1081         unsigned int total_len;
1082
1083         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1084                              &total_len);
1085         if (rc)
1086                 return rc;
1087
1088         /* First session, not a reauthenticate */
1089         req->sync_hdr.SessionId = 0;
1090
1091         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1092         req->PreviousSessionId = sess_data->previous_session;
1093
1094         req->Flags = 0; /* MBZ */
1095
1096         /* enough to enable echos and oplocks and one max size write */
1097         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1098
1099         /* only one of SMB2 signing flags may be set in SMB2 request */
1100         if (server->sign)
1101                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1102         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1103                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1104         else
1105                 req->SecurityMode = 0;
1106
1107         req->Capabilities = 0;
1108         req->Channel = 0; /* MBZ */
1109
1110         sess_data->iov[0].iov_base = (char *)req;
1111         /* 1 for pad */
1112         sess_data->iov[0].iov_len = total_len - 1;
1113         /*
1114          * This variable will be used to clear the buffer
1115          * allocated above in case of any error in the calling function.
1116          */
1117         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1118
1119         return 0;
1120 }
1121
1122 static void
1123 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1124 {
1125         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1126         sess_data->buf0_type = CIFS_NO_BUFFER;
1127 }
1128
1129 static int
1130 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1131 {
1132         int rc;
1133         struct smb_rqst rqst;
1134         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1135         struct kvec rsp_iov = { NULL, 0 };
1136
1137         /* Testing shows that buffer offset must be at location of Buffer[0] */
1138         req->SecurityBufferOffset =
1139                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1140         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1141
1142         memset(&rqst, 0, sizeof(struct smb_rqst));
1143         rqst.rq_iov = sess_data->iov;
1144         rqst.rq_nvec = 2;
1145
1146         /* BB add code to build os and lm fields */
1147         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1148                             &rqst,
1149                             &sess_data->buf0_type,
1150                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1151         cifs_small_buf_release(sess_data->iov[0].iov_base);
1152         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1153
1154         return rc;
1155 }
1156
1157 static int
1158 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1159 {
1160         int rc = 0;
1161         struct cifs_ses *ses = sess_data->ses;
1162
1163         mutex_lock(&ses->server->srv_mutex);
1164         if (ses->server->ops->generate_signingkey) {
1165                 rc = ses->server->ops->generate_signingkey(ses);
1166                 if (rc) {
1167                         cifs_dbg(FYI,
1168                                 "SMB3 session key generation failed\n");
1169                         mutex_unlock(&ses->server->srv_mutex);
1170                         return rc;
1171                 }
1172         }
1173         if (!ses->server->session_estab) {
1174                 ses->server->sequence_number = 0x2;
1175                 ses->server->session_estab = true;
1176         }
1177         mutex_unlock(&ses->server->srv_mutex);
1178
1179         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1180         spin_lock(&GlobalMid_Lock);
1181         ses->status = CifsGood;
1182         ses->need_reconnect = false;
1183         spin_unlock(&GlobalMid_Lock);
1184         return rc;
1185 }
1186
1187 #ifdef CONFIG_CIFS_UPCALL
1188 static void
1189 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1190 {
1191         int rc;
1192         struct cifs_ses *ses = sess_data->ses;
1193         struct cifs_spnego_msg *msg;
1194         struct key *spnego_key = NULL;
1195         struct smb2_sess_setup_rsp *rsp = NULL;
1196
1197         rc = SMB2_sess_alloc_buffer(sess_data);
1198         if (rc)
1199                 goto out;
1200
1201         spnego_key = cifs_get_spnego_key(ses);
1202         if (IS_ERR(spnego_key)) {
1203                 rc = PTR_ERR(spnego_key);
1204                 spnego_key = NULL;
1205                 goto out;
1206         }
1207
1208         msg = spnego_key->payload.data[0];
1209         /*
1210          * check version field to make sure that cifs.upcall is
1211          * sending us a response in an expected form
1212          */
1213         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1214                 cifs_dbg(VFS,
1215                           "bad cifs.upcall version. Expected %d got %d",
1216                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1217                 rc = -EKEYREJECTED;
1218                 goto out_put_spnego_key;
1219         }
1220
1221         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1222                                          GFP_KERNEL);
1223         if (!ses->auth_key.response) {
1224                 cifs_dbg(VFS,
1225                         "Kerberos can't allocate (%u bytes) memory",
1226                         msg->sesskey_len);
1227                 rc = -ENOMEM;
1228                 goto out_put_spnego_key;
1229         }
1230         ses->auth_key.len = msg->sesskey_len;
1231
1232         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1233         sess_data->iov[1].iov_len = msg->secblob_len;
1234
1235         rc = SMB2_sess_sendreceive(sess_data);
1236         if (rc)
1237                 goto out_put_spnego_key;
1238
1239         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1240         ses->Suid = rsp->sync_hdr.SessionId;
1241
1242         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1243
1244         rc = SMB2_sess_establish_session(sess_data);
1245 out_put_spnego_key:
1246         key_invalidate(spnego_key);
1247         key_put(spnego_key);
1248 out:
1249         sess_data->result = rc;
1250         sess_data->func = NULL;
1251         SMB2_sess_free_buffer(sess_data);
1252 }
1253 #else
1254 static void
1255 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1256 {
1257         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1258         sess_data->result = -EOPNOTSUPP;
1259         sess_data->func = NULL;
1260 }
1261 #endif
1262
1263 static void
1264 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1265
1266 static void
1267 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1268 {
1269         int rc;
1270         struct cifs_ses *ses = sess_data->ses;
1271         struct smb2_sess_setup_rsp *rsp = NULL;
1272         char *ntlmssp_blob = NULL;
1273         bool use_spnego = false; /* else use raw ntlmssp */
1274         u16 blob_length = 0;
1275
1276         /*
1277          * If memory allocation is successful, caller of this function
1278          * frees it.
1279          */
1280         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1281         if (!ses->ntlmssp) {
1282                 rc = -ENOMEM;
1283                 goto out_err;
1284         }
1285         ses->ntlmssp->sesskey_per_smbsess = true;
1286
1287         rc = SMB2_sess_alloc_buffer(sess_data);
1288         if (rc)
1289                 goto out_err;
1290
1291         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1292                                GFP_KERNEL);
1293         if (ntlmssp_blob == NULL) {
1294                 rc = -ENOMEM;
1295                 goto out;
1296         }
1297
1298         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1299         if (use_spnego) {
1300                 /* BB eventually need to add this */
1301                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1302                 rc = -EOPNOTSUPP;
1303                 goto out;
1304         } else {
1305                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1306                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1307         }
1308         sess_data->iov[1].iov_base = ntlmssp_blob;
1309         sess_data->iov[1].iov_len = blob_length;
1310
1311         rc = SMB2_sess_sendreceive(sess_data);
1312         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1313
1314         /* If true, rc here is expected and not an error */
1315         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1316                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1317                 rc = 0;
1318
1319         if (rc)
1320                 goto out;
1321
1322         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1323                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1324                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1325                         le16_to_cpu(rsp->SecurityBufferOffset));
1326                 rc = -EIO;
1327                 goto out;
1328         }
1329         rc = decode_ntlmssp_challenge(rsp->Buffer,
1330                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1331         if (rc)
1332                 goto out;
1333
1334         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1335
1336
1337         ses->Suid = rsp->sync_hdr.SessionId;
1338         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1339
1340 out:
1341         kfree(ntlmssp_blob);
1342         SMB2_sess_free_buffer(sess_data);
1343         if (!rc) {
1344                 sess_data->result = 0;
1345                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1346                 return;
1347         }
1348 out_err:
1349         kfree(ses->ntlmssp);
1350         ses->ntlmssp = NULL;
1351         sess_data->result = rc;
1352         sess_data->func = NULL;
1353 }
1354
1355 static void
1356 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1357 {
1358         int rc;
1359         struct cifs_ses *ses = sess_data->ses;
1360         struct smb2_sess_setup_req *req;
1361         struct smb2_sess_setup_rsp *rsp = NULL;
1362         unsigned char *ntlmssp_blob = NULL;
1363         bool use_spnego = false; /* else use raw ntlmssp */
1364         u16 blob_length = 0;
1365
1366         rc = SMB2_sess_alloc_buffer(sess_data);
1367         if (rc)
1368                 goto out;
1369
1370         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1371         req->sync_hdr.SessionId = ses->Suid;
1372
1373         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1374                                         sess_data->nls_cp);
1375         if (rc) {
1376                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1377                 goto out;
1378         }
1379
1380         if (use_spnego) {
1381                 /* BB eventually need to add this */
1382                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1383                 rc = -EOPNOTSUPP;
1384                 goto out;
1385         }
1386         sess_data->iov[1].iov_base = ntlmssp_blob;
1387         sess_data->iov[1].iov_len = blob_length;
1388
1389         rc = SMB2_sess_sendreceive(sess_data);
1390         if (rc)
1391                 goto out;
1392
1393         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1394
1395         ses->Suid = rsp->sync_hdr.SessionId;
1396         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1397
1398         rc = SMB2_sess_establish_session(sess_data);
1399 out:
1400         kfree(ntlmssp_blob);
1401         SMB2_sess_free_buffer(sess_data);
1402         kfree(ses->ntlmssp);
1403         ses->ntlmssp = NULL;
1404         sess_data->result = rc;
1405         sess_data->func = NULL;
1406 }
1407
1408 static int
1409 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1410 {
1411         int type;
1412
1413         type = smb2_select_sectype(ses->server, ses->sectype);
1414         cifs_dbg(FYI, "sess setup type %d\n", type);
1415         if (type == Unspecified) {
1416                 cifs_dbg(VFS,
1417                         "Unable to select appropriate authentication method!");
1418                 return -EINVAL;
1419         }
1420
1421         switch (type) {
1422         case Kerberos:
1423                 sess_data->func = SMB2_auth_kerberos;
1424                 break;
1425         case RawNTLMSSP:
1426                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1427                 break;
1428         default:
1429                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1430                 return -EOPNOTSUPP;
1431         }
1432
1433         return 0;
1434 }
1435
1436 int
1437 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1438                 const struct nls_table *nls_cp)
1439 {
1440         int rc = 0;
1441         struct TCP_Server_Info *server = ses->server;
1442         struct SMB2_sess_data *sess_data;
1443
1444         cifs_dbg(FYI, "Session Setup\n");
1445
1446         if (!server) {
1447                 WARN(1, "%s: server is NULL!\n", __func__);
1448                 return -EIO;
1449         }
1450
1451         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1452         if (!sess_data)
1453                 return -ENOMEM;
1454
1455         rc = SMB2_select_sec(ses, sess_data);
1456         if (rc)
1457                 goto out;
1458         sess_data->xid = xid;
1459         sess_data->ses = ses;
1460         sess_data->buf0_type = CIFS_NO_BUFFER;
1461         sess_data->nls_cp = (struct nls_table *) nls_cp;
1462         sess_data->previous_session = ses->Suid;
1463
1464         /*
1465          * Initialize the session hash with the server one.
1466          */
1467         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1468                SMB2_PREAUTH_HASH_SIZE);
1469
1470         while (sess_data->func)
1471                 sess_data->func(sess_data);
1472
1473         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1474                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1475         rc = sess_data->result;
1476 out:
1477         kfree(sess_data);
1478         return rc;
1479 }
1480
1481 int
1482 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1483 {
1484         struct smb_rqst rqst;
1485         struct smb2_logoff_req *req; /* response is also trivial struct */
1486         int rc = 0;
1487         struct TCP_Server_Info *server;
1488         int flags = 0;
1489         unsigned int total_len;
1490         struct kvec iov[1];
1491         struct kvec rsp_iov;
1492         int resp_buf_type;
1493
1494         cifs_dbg(FYI, "disconnect session %p\n", ses);
1495
1496         if (ses && (ses->server))
1497                 server = ses->server;
1498         else
1499                 return -EIO;
1500
1501         /* no need to send SMB logoff if uid already closed due to reconnect */
1502         if (ses->need_reconnect)
1503                 goto smb2_session_already_dead;
1504
1505         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1506         if (rc)
1507                 return rc;
1508
1509          /* since no tcon, smb2_init can not do this, so do here */
1510         req->sync_hdr.SessionId = ses->Suid;
1511
1512         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1513                 flags |= CIFS_TRANSFORM_REQ;
1514         else if (server->sign)
1515                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1516
1517         flags |= CIFS_NO_RESP;
1518
1519         iov[0].iov_base = (char *)req;
1520         iov[0].iov_len = total_len;
1521
1522         memset(&rqst, 0, sizeof(struct smb_rqst));
1523         rqst.rq_iov = iov;
1524         rqst.rq_nvec = 1;
1525
1526         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1527         cifs_small_buf_release(req);
1528         /*
1529          * No tcon so can't do
1530          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1531          */
1532
1533 smb2_session_already_dead:
1534         return rc;
1535 }
1536
1537 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1538 {
1539         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1540 }
1541
1542 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1543
1544 /* These are similar values to what Windows uses */
1545 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1546 {
1547         tcon->max_chunks = 256;
1548         tcon->max_bytes_chunk = 1048576;
1549         tcon->max_bytes_copy = 16777216;
1550 }
1551
1552 int
1553 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1554           struct cifs_tcon *tcon, const struct nls_table *cp)
1555 {
1556         struct smb_rqst rqst;
1557         struct smb2_tree_connect_req *req;
1558         struct smb2_tree_connect_rsp *rsp = NULL;
1559         struct kvec iov[2];
1560         struct kvec rsp_iov = { NULL, 0 };
1561         int rc = 0;
1562         int resp_buftype;
1563         int unc_path_len;
1564         __le16 *unc_path = NULL;
1565         int flags = 0;
1566         unsigned int total_len;
1567
1568         cifs_dbg(FYI, "TCON\n");
1569
1570         if (!(ses->server) || !tree)
1571                 return -EIO;
1572
1573         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1574         if (unc_path == NULL)
1575                 return -ENOMEM;
1576
1577         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1578         unc_path_len *= 2;
1579         if (unc_path_len < 2) {
1580                 kfree(unc_path);
1581                 return -EINVAL;
1582         }
1583
1584         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1585         tcon->tid = 0;
1586         atomic_set(&tcon->num_remote_opens, 0);
1587         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1588                              &total_len);
1589         if (rc) {
1590                 kfree(unc_path);
1591                 return rc;
1592         }
1593
1594         if (smb3_encryption_required(tcon))
1595                 flags |= CIFS_TRANSFORM_REQ;
1596
1597         iov[0].iov_base = (char *)req;
1598         /* 1 for pad */
1599         iov[0].iov_len = total_len - 1;
1600
1601         /* Testing shows that buffer offset must be at location of Buffer[0] */
1602         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1603                         - 1 /* pad */);
1604         req->PathLength = cpu_to_le16(unc_path_len - 2);
1605         iov[1].iov_base = unc_path;
1606         iov[1].iov_len = unc_path_len;
1607
1608         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1609         if ((ses->server->dialect == SMB311_PROT_ID) &&
1610             !smb3_encryption_required(tcon))
1611                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1612
1613         memset(&rqst, 0, sizeof(struct smb_rqst));
1614         rqst.rq_iov = iov;
1615         rqst.rq_nvec = 2;
1616
1617         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1618         cifs_small_buf_release(req);
1619         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1620         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1621         if (rc != 0) {
1622                 if (tcon) {
1623                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1624                         tcon->need_reconnect = true;
1625                 }
1626                 goto tcon_error_exit;
1627         }
1628
1629         switch (rsp->ShareType) {
1630         case SMB2_SHARE_TYPE_DISK:
1631                 cifs_dbg(FYI, "connection to disk share\n");
1632                 break;
1633         case SMB2_SHARE_TYPE_PIPE:
1634                 tcon->pipe = true;
1635                 cifs_dbg(FYI, "connection to pipe share\n");
1636                 break;
1637         case SMB2_SHARE_TYPE_PRINT:
1638                 tcon->print = true;
1639                 cifs_dbg(FYI, "connection to printer\n");
1640                 break;
1641         default:
1642                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1643                 rc = -EOPNOTSUPP;
1644                 goto tcon_error_exit;
1645         }
1646
1647         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1648         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1649         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1650         tcon->tidStatus = CifsGood;
1651         tcon->need_reconnect = false;
1652         tcon->tid = rsp->sync_hdr.TreeId;
1653         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1654
1655         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1656             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1657                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1658
1659         if (tcon->seal &&
1660             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1661                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1662
1663         init_copy_chunk_defaults(tcon);
1664         if (tcon->ses->server->ops->validate_negotiate)
1665                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1666 tcon_exit:
1667
1668         free_rsp_buf(resp_buftype, rsp);
1669         kfree(unc_path);
1670         return rc;
1671
1672 tcon_error_exit:
1673         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1674                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1675         }
1676         goto tcon_exit;
1677 }
1678
1679 int
1680 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1681 {
1682         struct smb_rqst rqst;
1683         struct smb2_tree_disconnect_req *req; /* response is trivial */
1684         int rc = 0;
1685         struct cifs_ses *ses = tcon->ses;
1686         int flags = 0;
1687         unsigned int total_len;
1688         struct kvec iov[1];
1689         struct kvec rsp_iov;
1690         int resp_buf_type;
1691
1692         cifs_dbg(FYI, "Tree Disconnect\n");
1693
1694         if (!ses || !(ses->server))
1695                 return -EIO;
1696
1697         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1698                 return 0;
1699
1700         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1701                              &total_len);
1702         if (rc)
1703                 return rc;
1704
1705         if (smb3_encryption_required(tcon))
1706                 flags |= CIFS_TRANSFORM_REQ;
1707
1708         flags |= CIFS_NO_RESP;
1709
1710         iov[0].iov_base = (char *)req;
1711         iov[0].iov_len = total_len;
1712
1713         memset(&rqst, 0, sizeof(struct smb_rqst));
1714         rqst.rq_iov = iov;
1715         rqst.rq_nvec = 1;
1716
1717         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1718         cifs_small_buf_release(req);
1719         if (rc)
1720                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1721
1722         return rc;
1723 }
1724
1725
1726 static struct create_durable *
1727 create_durable_buf(void)
1728 {
1729         struct create_durable *buf;
1730
1731         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1732         if (!buf)
1733                 return NULL;
1734
1735         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1736                                         (struct create_durable, Data));
1737         buf->ccontext.DataLength = cpu_to_le32(16);
1738         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1739                                 (struct create_durable, Name));
1740         buf->ccontext.NameLength = cpu_to_le16(4);
1741         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1742         buf->Name[0] = 'D';
1743         buf->Name[1] = 'H';
1744         buf->Name[2] = 'n';
1745         buf->Name[3] = 'Q';
1746         return buf;
1747 }
1748
1749 static struct create_durable *
1750 create_reconnect_durable_buf(struct cifs_fid *fid)
1751 {
1752         struct create_durable *buf;
1753
1754         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1755         if (!buf)
1756                 return NULL;
1757
1758         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1759                                         (struct create_durable, Data));
1760         buf->ccontext.DataLength = cpu_to_le32(16);
1761         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1762                                 (struct create_durable, Name));
1763         buf->ccontext.NameLength = cpu_to_le16(4);
1764         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1765         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1766         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1767         buf->Name[0] = 'D';
1768         buf->Name[1] = 'H';
1769         buf->Name[2] = 'n';
1770         buf->Name[3] = 'C';
1771         return buf;
1772 }
1773
1774 static __u8
1775 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1776                   unsigned int *epoch, char *lease_key)
1777 {
1778         char *data_offset;
1779         struct create_context *cc;
1780         unsigned int next;
1781         unsigned int remaining;
1782         char *name;
1783
1784         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1785         remaining = le32_to_cpu(rsp->CreateContextsLength);
1786         cc = (struct create_context *)data_offset;
1787         while (remaining >= sizeof(struct create_context)) {
1788                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1789                 if (le16_to_cpu(cc->NameLength) == 4 &&
1790                     strncmp(name, "RqLs", 4) == 0)
1791                         return server->ops->parse_lease_buf(cc, epoch,
1792                                                             lease_key);
1793
1794                 next = le32_to_cpu(cc->Next);
1795                 if (!next)
1796                         break;
1797                 remaining -= next;
1798                 cc = (struct create_context *)((char *)cc + next);
1799         }
1800
1801         return 0;
1802 }
1803
1804 static int
1805 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1806                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1807 {
1808         struct smb2_create_req *req = iov[0].iov_base;
1809         unsigned int num = *num_iovec;
1810
1811         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1812         if (iov[num].iov_base == NULL)
1813                 return -ENOMEM;
1814         iov[num].iov_len = server->vals->create_lease_size;
1815         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1816         if (!req->CreateContextsOffset)
1817                 req->CreateContextsOffset = cpu_to_le32(
1818                                 sizeof(struct smb2_create_req) +
1819                                 iov[num - 1].iov_len);
1820         le32_add_cpu(&req->CreateContextsLength,
1821                      server->vals->create_lease_size);
1822         *num_iovec = num + 1;
1823         return 0;
1824 }
1825
1826 static struct create_durable_v2 *
1827 create_durable_v2_buf(struct cifs_fid *pfid)
1828 {
1829         struct create_durable_v2 *buf;
1830
1831         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1832         if (!buf)
1833                 return NULL;
1834
1835         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1836                                         (struct create_durable_v2, dcontext));
1837         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1838         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1839                                 (struct create_durable_v2, Name));
1840         buf->ccontext.NameLength = cpu_to_le16(4);
1841
1842         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1843         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1844         generate_random_uuid(buf->dcontext.CreateGuid);
1845         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1846
1847         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1848         buf->Name[0] = 'D';
1849         buf->Name[1] = 'H';
1850         buf->Name[2] = '2';
1851         buf->Name[3] = 'Q';
1852         return buf;
1853 }
1854
1855 static struct create_durable_handle_reconnect_v2 *
1856 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1857 {
1858         struct create_durable_handle_reconnect_v2 *buf;
1859
1860         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1861                         GFP_KERNEL);
1862         if (!buf)
1863                 return NULL;
1864
1865         buf->ccontext.DataOffset =
1866                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1867                                      dcontext));
1868         buf->ccontext.DataLength =
1869                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1870         buf->ccontext.NameOffset =
1871                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1872                             Name));
1873         buf->ccontext.NameLength = cpu_to_le16(4);
1874
1875         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1876         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1877         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1878         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1879
1880         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1881         buf->Name[0] = 'D';
1882         buf->Name[1] = 'H';
1883         buf->Name[2] = '2';
1884         buf->Name[3] = 'C';
1885         return buf;
1886 }
1887
1888 static int
1889 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1890                     struct cifs_open_parms *oparms)
1891 {
1892         struct smb2_create_req *req = iov[0].iov_base;
1893         unsigned int num = *num_iovec;
1894
1895         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1896         if (iov[num].iov_base == NULL)
1897                 return -ENOMEM;
1898         iov[num].iov_len = sizeof(struct create_durable_v2);
1899         if (!req->CreateContextsOffset)
1900                 req->CreateContextsOffset =
1901                         cpu_to_le32(sizeof(struct smb2_create_req) +
1902                                                                 iov[1].iov_len);
1903         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1904         *num_iovec = num + 1;
1905         return 0;
1906 }
1907
1908 static int
1909 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1910                     struct cifs_open_parms *oparms)
1911 {
1912         struct smb2_create_req *req = iov[0].iov_base;
1913         unsigned int num = *num_iovec;
1914
1915         /* indicate that we don't need to relock the file */
1916         oparms->reconnect = false;
1917
1918         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1919         if (iov[num].iov_base == NULL)
1920                 return -ENOMEM;
1921         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1922         if (!req->CreateContextsOffset)
1923                 req->CreateContextsOffset =
1924                         cpu_to_le32(sizeof(struct smb2_create_req) +
1925                                                                 iov[1].iov_len);
1926         le32_add_cpu(&req->CreateContextsLength,
1927                         sizeof(struct create_durable_handle_reconnect_v2));
1928         *num_iovec = num + 1;
1929         return 0;
1930 }
1931
1932 static int
1933 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1934                     struct cifs_open_parms *oparms, bool use_persistent)
1935 {
1936         struct smb2_create_req *req = iov[0].iov_base;
1937         unsigned int num = *num_iovec;
1938
1939         if (use_persistent) {
1940                 if (oparms->reconnect)
1941                         return add_durable_reconnect_v2_context(iov, num_iovec,
1942                                                                 oparms);
1943                 else
1944                         return add_durable_v2_context(iov, num_iovec, oparms);
1945         }
1946
1947         if (oparms->reconnect) {
1948                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1949                 /* indicate that we don't need to relock the file */
1950                 oparms->reconnect = false;
1951         } else
1952                 iov[num].iov_base = create_durable_buf();
1953         if (iov[num].iov_base == NULL)
1954                 return -ENOMEM;
1955         iov[num].iov_len = sizeof(struct create_durable);
1956         if (!req->CreateContextsOffset)
1957                 req->CreateContextsOffset =
1958                         cpu_to_le32(sizeof(struct smb2_create_req) +
1959                                                                 iov[1].iov_len);
1960         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1961         *num_iovec = num + 1;
1962         return 0;
1963 }
1964
1965 /* See MS-SMB2 2.2.13.2.7 */
1966 static struct crt_twarp_ctxt *
1967 create_twarp_buf(__u64 timewarp)
1968 {
1969         struct crt_twarp_ctxt *buf;
1970
1971         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
1972         if (!buf)
1973                 return NULL;
1974
1975         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1976                                         (struct crt_twarp_ctxt, Timestamp));
1977         buf->ccontext.DataLength = cpu_to_le32(8);
1978         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1979                                 (struct crt_twarp_ctxt, Name));
1980         buf->ccontext.NameLength = cpu_to_le16(4);
1981         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
1982         buf->Name[0] = 'T';
1983         buf->Name[1] = 'W';
1984         buf->Name[2] = 'r';
1985         buf->Name[3] = 'p';
1986         buf->Timestamp = cpu_to_le64(timewarp);
1987         return buf;
1988 }
1989
1990 /* See MS-SMB2 2.2.13.2.7 */
1991 static int
1992 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
1993 {
1994         struct smb2_create_req *req = iov[0].iov_base;
1995         unsigned int num = *num_iovec;
1996
1997         iov[num].iov_base = create_twarp_buf(timewarp);
1998         if (iov[num].iov_base == NULL)
1999                 return -ENOMEM;
2000         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2001         if (!req->CreateContextsOffset)
2002                 req->CreateContextsOffset = cpu_to_le32(
2003                                 sizeof(struct smb2_create_req) +
2004                                 iov[num - 1].iov_len);
2005         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2006         *num_iovec = num + 1;
2007         return 0;
2008 }
2009
2010 static int
2011 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2012                             const char *treename, const __le16 *path)
2013 {
2014         int treename_len, path_len;
2015         struct nls_table *cp;
2016         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2017
2018         /*
2019          * skip leading "\\"
2020          */
2021         treename_len = strlen(treename);
2022         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2023                 return -EINVAL;
2024
2025         treename += 2;
2026         treename_len -= 2;
2027
2028         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2029
2030         /*
2031          * make room for one path separator between the treename and
2032          * path
2033          */
2034         *out_len = treename_len + 1 + path_len;
2035
2036         /*
2037          * final path needs to be null-terminated UTF16 with a
2038          * size aligned to 8
2039          */
2040
2041         *out_size = roundup((*out_len+1)*2, 8);
2042         *out_path = kzalloc(*out_size, GFP_KERNEL);
2043         if (!*out_path)
2044                 return -ENOMEM;
2045
2046         cp = load_nls_default();
2047         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2048         UniStrcat(*out_path, sep);
2049         UniStrcat(*out_path, path);
2050         unload_nls(cp);
2051
2052         return 0;
2053 }
2054
2055 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2056                                umode_t mode, struct cifs_tcon *tcon,
2057                                const char *full_path,
2058                                struct cifs_sb_info *cifs_sb)
2059 {
2060         struct smb_rqst rqst;
2061         struct smb2_create_req *req;
2062         struct smb2_create_rsp *rsp = NULL;
2063         struct cifs_ses *ses = tcon->ses;
2064         struct kvec iov[3]; /* make sure at least one for each open context */
2065         struct kvec rsp_iov = {NULL, 0};
2066         int resp_buftype;
2067         int uni_path_len;
2068         __le16 *copy_path = NULL;
2069         int copy_size;
2070         int rc = 0;
2071         unsigned int n_iov = 2;
2072         __u32 file_attributes = 0;
2073         char *pc_buf = NULL;
2074         int flags = 0;
2075         unsigned int total_len;
2076         __le16 *utf16_path = NULL;
2077
2078         cifs_dbg(FYI, "mkdir\n");
2079
2080         /* resource #1: path allocation */
2081         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2082         if (!utf16_path)
2083                 return -ENOMEM;
2084
2085         if (!ses || !(ses->server)) {
2086                 rc = -EIO;
2087                 goto err_free_path;
2088         }
2089
2090         /* resource #2: request */
2091         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2092         if (rc)
2093                 goto err_free_path;
2094
2095
2096         if (smb3_encryption_required(tcon))
2097                 flags |= CIFS_TRANSFORM_REQ;
2098
2099         req->ImpersonationLevel = IL_IMPERSONATION;
2100         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2101         /* File attributes ignored on open (used in create though) */
2102         req->FileAttributes = cpu_to_le32(file_attributes);
2103         req->ShareAccess = FILE_SHARE_ALL_LE;
2104         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2105         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2106
2107         iov[0].iov_base = (char *)req;
2108         /* -1 since last byte is buf[0] which is sent below (path) */
2109         iov[0].iov_len = total_len - 1;
2110
2111         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2112
2113         /* [MS-SMB2] 2.2.13 NameOffset:
2114          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2115          * the SMB2 header, the file name includes a prefix that will
2116          * be processed during DFS name normalization as specified in
2117          * section 3.3.5.9. Otherwise, the file name is relative to
2118          * the share that is identified by the TreeId in the SMB2
2119          * header.
2120          */
2121         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2122                 int name_len;
2123
2124                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2125                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2126                                                  &name_len,
2127                                                  tcon->treeName, utf16_path);
2128                 if (rc)
2129                         goto err_free_req;
2130
2131                 req->NameLength = cpu_to_le16(name_len * 2);
2132                 uni_path_len = copy_size;
2133                 /* free before overwriting resource */
2134                 kfree(utf16_path);
2135                 utf16_path = copy_path;
2136         } else {
2137                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2138                 /* MUST set path len (NameLength) to 0 opening root of share */
2139                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2140                 if (uni_path_len % 8 != 0) {
2141                         copy_size = roundup(uni_path_len, 8);
2142                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2143                         if (!copy_path) {
2144                                 rc = -ENOMEM;
2145                                 goto err_free_req;
2146                         }
2147                         memcpy((char *)copy_path, (const char *)utf16_path,
2148                                uni_path_len);
2149                         uni_path_len = copy_size;
2150                         /* free before overwriting resource */
2151                         kfree(utf16_path);
2152                         utf16_path = copy_path;
2153                 }
2154         }
2155
2156         iov[1].iov_len = uni_path_len;
2157         iov[1].iov_base = utf16_path;
2158         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2159
2160         if (tcon->posix_extensions) {
2161                 /* resource #3: posix buf */
2162                 rc = add_posix_context(iov, &n_iov, mode);
2163                 if (rc)
2164                         goto err_free_req;
2165                 pc_buf = iov[n_iov-1].iov_base;
2166         }
2167
2168
2169         memset(&rqst, 0, sizeof(struct smb_rqst));
2170         rqst.rq_iov = iov;
2171         rqst.rq_nvec = n_iov;
2172
2173         /* resource #4: response buffer */
2174         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2175         if (rc) {
2176                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2177                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2178                                            CREATE_NOT_FILE,
2179                                            FILE_WRITE_ATTRIBUTES, rc);
2180                 goto err_free_rsp_buf;
2181         }
2182
2183         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2184         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2185                                     ses->Suid, CREATE_NOT_FILE,
2186                                     FILE_WRITE_ATTRIBUTES);
2187
2188         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2189
2190         /* Eventually save off posix specific response info and timestaps */
2191
2192 err_free_rsp_buf:
2193         free_rsp_buf(resp_buftype, rsp);
2194         kfree(pc_buf);
2195 err_free_req:
2196         cifs_small_buf_release(req);
2197 err_free_path:
2198         kfree(utf16_path);
2199         return rc;
2200 }
2201
2202 int
2203 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2204                struct cifs_open_parms *oparms, __le16 *path)
2205 {
2206         struct TCP_Server_Info *server = tcon->ses->server;
2207         struct smb2_create_req *req;
2208         unsigned int n_iov = 2;
2209         __u32 file_attributes = 0;
2210         int copy_size;
2211         int uni_path_len;
2212         unsigned int total_len;
2213         struct kvec *iov = rqst->rq_iov;
2214         __le16 *copy_path;
2215         int rc;
2216
2217         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2218         if (rc)
2219                 return rc;
2220
2221         iov[0].iov_base = (char *)req;
2222         /* -1 since last byte is buf[0] which is sent below (path) */
2223         iov[0].iov_len = total_len - 1;
2224
2225         if (oparms->create_options & CREATE_OPTION_READONLY)
2226                 file_attributes |= ATTR_READONLY;
2227         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2228                 file_attributes |= ATTR_SYSTEM;
2229
2230         req->ImpersonationLevel = IL_IMPERSONATION;
2231         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2232         /* File attributes ignored on open (used in create though) */
2233         req->FileAttributes = cpu_to_le32(file_attributes);
2234         req->ShareAccess = FILE_SHARE_ALL_LE;
2235         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2236         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2237         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2238
2239         /* [MS-SMB2] 2.2.13 NameOffset:
2240          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2241          * the SMB2 header, the file name includes a prefix that will
2242          * be processed during DFS name normalization as specified in
2243          * section 3.3.5.9. Otherwise, the file name is relative to
2244          * the share that is identified by the TreeId in the SMB2
2245          * header.
2246          */
2247         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2248                 int name_len;
2249
2250                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2251                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2252                                                  &name_len,
2253                                                  tcon->treeName, path);
2254                 if (rc)
2255                         return rc;
2256                 req->NameLength = cpu_to_le16(name_len * 2);
2257                 uni_path_len = copy_size;
2258                 path = copy_path;
2259         } else {
2260                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2261                 /* MUST set path len (NameLength) to 0 opening root of share */
2262                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2263                 copy_size = uni_path_len;
2264                 if (copy_size % 8 != 0)
2265                         copy_size = roundup(copy_size, 8);
2266                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2267                 if (!copy_path)
2268                         return -ENOMEM;
2269                 memcpy((char *)copy_path, (const char *)path,
2270                        uni_path_len);
2271                 uni_path_len = copy_size;
2272                 path = copy_path;
2273         }
2274
2275         iov[1].iov_len = uni_path_len;
2276         iov[1].iov_base = path;
2277
2278         if (!server->oplocks)
2279                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2280
2281         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2282             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2283                 req->RequestedOplockLevel = *oplock;
2284         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2285                   (oparms->create_options & CREATE_NOT_FILE))
2286                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2287         else {
2288                 rc = add_lease_context(server, iov, &n_iov,
2289                                        oparms->fid->lease_key, oplock);
2290                 if (rc)
2291                         return rc;
2292         }
2293
2294         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2295                 /* need to set Next field of lease context if we request it */
2296                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2297                         struct create_context *ccontext =
2298                             (struct create_context *)iov[n_iov-1].iov_base;
2299                         ccontext->Next =
2300                                 cpu_to_le32(server->vals->create_lease_size);
2301                 }
2302
2303                 rc = add_durable_context(iov, &n_iov, oparms,
2304                                         tcon->use_persistent);
2305                 if (rc)
2306                         return rc;
2307         }
2308
2309         if (tcon->posix_extensions) {
2310                 if (n_iov > 2) {
2311                         struct create_context *ccontext =
2312                             (struct create_context *)iov[n_iov-1].iov_base;
2313                         ccontext->Next =
2314                                 cpu_to_le32(iov[n_iov-1].iov_len);
2315                 }
2316
2317                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2318                 if (rc)
2319                         return rc;
2320         }
2321
2322         if (tcon->snapshot_time) {
2323                 cifs_dbg(FYI, "adding snapshot context\n");
2324                 if (n_iov > 2) {
2325                         struct create_context *ccontext =
2326                             (struct create_context *)iov[n_iov-1].iov_base;
2327                         ccontext->Next =
2328                                 cpu_to_le32(iov[n_iov-1].iov_len);
2329                 }
2330
2331                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2332                 if (rc)
2333                         return rc;
2334         }
2335
2336
2337         rqst->rq_nvec = n_iov;
2338         return 0;
2339 }
2340
2341 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2342  * All other vectors are freed by kfree().
2343  */
2344 void
2345 SMB2_open_free(struct smb_rqst *rqst)
2346 {
2347         int i;
2348
2349         if (rqst && rqst->rq_iov) {
2350                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2351                 for (i = 1; i < rqst->rq_nvec; i++)
2352                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2353                                 kfree(rqst->rq_iov[i].iov_base);
2354         }
2355 }
2356
2357 int
2358 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2359           __u8 *oplock, struct smb2_file_all_info *buf,
2360           struct kvec *err_iov, int *buftype)
2361 {
2362         struct smb_rqst rqst;
2363         struct smb2_create_rsp *rsp = NULL;
2364         struct TCP_Server_Info *server;
2365         struct cifs_tcon *tcon = oparms->tcon;
2366         struct cifs_ses *ses = tcon->ses;
2367         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2368         struct kvec rsp_iov = {NULL, 0};
2369         int resp_buftype = CIFS_NO_BUFFER;
2370         int rc = 0;
2371         int flags = 0;
2372
2373         cifs_dbg(FYI, "create/open\n");
2374         if (ses && (ses->server))
2375                 server = ses->server;
2376         else
2377                 return -EIO;
2378
2379         if (smb3_encryption_required(tcon))
2380                 flags |= CIFS_TRANSFORM_REQ;
2381
2382         memset(&rqst, 0, sizeof(struct smb_rqst));
2383         memset(&iov, 0, sizeof(iov));
2384         rqst.rq_iov = iov;
2385         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2386
2387         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2388         if (rc)
2389                 goto creat_exit;
2390
2391         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2392                             &rsp_iov);
2393         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2394
2395         if (rc != 0) {
2396                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2397                 if (err_iov && rsp) {
2398                         *err_iov = rsp_iov;
2399                         *buftype = resp_buftype;
2400                         resp_buftype = CIFS_NO_BUFFER;
2401                         rsp = NULL;
2402                 }
2403                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2404                                     oparms->create_options, oparms->desired_access, rc);
2405                 goto creat_exit;
2406         } else
2407                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2408                                      ses->Suid, oparms->create_options,
2409                                      oparms->desired_access);
2410
2411         atomic_inc(&tcon->num_remote_opens);
2412         oparms->fid->persistent_fid = rsp->PersistentFileId;
2413         oparms->fid->volatile_fid = rsp->VolatileFileId;
2414 #ifdef CONFIG_CIFS_DEBUG2
2415         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2416 #endif /* CIFS_DEBUG2 */
2417
2418         if (buf) {
2419                 memcpy(buf, &rsp->CreationTime, 32);
2420                 buf->AllocationSize = rsp->AllocationSize;
2421                 buf->EndOfFile = rsp->EndofFile;
2422                 buf->Attributes = rsp->FileAttributes;
2423                 buf->NumberOfLinks = cpu_to_le32(1);
2424                 buf->DeletePending = 0;
2425         }
2426
2427         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2428                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2429                                             oparms->fid->lease_key);
2430         else
2431                 *oplock = rsp->OplockLevel;
2432 creat_exit:
2433         SMB2_open_free(&rqst);
2434         free_rsp_buf(resp_buftype, rsp);
2435         return rc;
2436 }
2437
2438 /*
2439  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2440  */
2441 int
2442 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2443            u64 volatile_fid, u32 opcode, bool is_fsctl,
2444            char *in_data, u32 indatalen,
2445            char **out_data, u32 *plen /* returned data len */)
2446 {
2447         struct smb_rqst rqst;
2448         struct smb2_ioctl_req *req;
2449         struct smb2_ioctl_rsp *rsp;
2450         struct cifs_ses *ses;
2451         struct kvec iov[2];
2452         struct kvec rsp_iov;
2453         int resp_buftype;
2454         int n_iov;
2455         int rc = 0;
2456         int flags = 0;
2457         unsigned int total_len;
2458
2459         cifs_dbg(FYI, "SMB2 IOCTL\n");
2460
2461         if (out_data != NULL)
2462                 *out_data = NULL;
2463
2464         /* zero out returned data len, in case of error */
2465         if (plen)
2466                 *plen = 0;
2467
2468         if (tcon)
2469                 ses = tcon->ses;
2470         else
2471                 return -EIO;
2472
2473         if (!ses || !(ses->server))
2474                 return -EIO;
2475
2476         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2477         if (rc)
2478                 return rc;
2479
2480         if (smb3_encryption_required(tcon))
2481                 flags |= CIFS_TRANSFORM_REQ;
2482
2483         req->CtlCode = cpu_to_le32(opcode);
2484         req->PersistentFileId = persistent_fid;
2485         req->VolatileFileId = volatile_fid;
2486
2487         if (indatalen) {
2488                 req->InputCount = cpu_to_le32(indatalen);
2489                 /* do not set InputOffset if no input data */
2490                 req->InputOffset =
2491                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2492                 iov[1].iov_base = in_data;
2493                 iov[1].iov_len = indatalen;
2494                 n_iov = 2;
2495         } else
2496                 n_iov = 1;
2497
2498         req->OutputOffset = 0;
2499         req->OutputCount = 0; /* MBZ */
2500
2501         /*
2502          * Could increase MaxOutputResponse, but that would require more
2503          * than one credit. Windows typically sets this smaller, but for some
2504          * ioctls it may be useful to allow server to send more. No point
2505          * limiting what the server can send as long as fits in one credit
2506          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2507          * (by default, note that it can be overridden to make max larger)
2508          * in responses (except for read responses which can be bigger.
2509          * We may want to bump this limit up
2510          */
2511         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2512
2513         if (is_fsctl)
2514                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2515         else
2516                 req->Flags = 0;
2517
2518         iov[0].iov_base = (char *)req;
2519
2520         /*
2521          * If no input data, the size of ioctl struct in
2522          * protocol spec still includes a 1 byte data buffer,
2523          * but if input data passed to ioctl, we do not
2524          * want to double count this, so we do not send
2525          * the dummy one byte of data in iovec[0] if sending
2526          * input data (in iovec[1]).
2527          */
2528
2529         if (indatalen) {
2530                 iov[0].iov_len = total_len - 1;
2531         } else
2532                 iov[0].iov_len = total_len;
2533
2534         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2535         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2536                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2537
2538         memset(&rqst, 0, sizeof(struct smb_rqst));
2539         rqst.rq_iov = iov;
2540         rqst.rq_nvec = n_iov;
2541
2542         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2543                             &rsp_iov);
2544         cifs_small_buf_release(req);
2545         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2546
2547         if (rc != 0)
2548                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2549                                 ses->Suid, 0, opcode, rc);
2550
2551         if ((rc != 0) && (rc != -EINVAL)) {
2552                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2553                 goto ioctl_exit;
2554         } else if (rc == -EINVAL) {
2555                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2556                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2557                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2558                         goto ioctl_exit;
2559                 }
2560         }
2561
2562         /* check if caller wants to look at return data or just return rc */
2563         if ((plen == NULL) || (out_data == NULL))
2564                 goto ioctl_exit;
2565
2566         *plen = le32_to_cpu(rsp->OutputCount);
2567
2568         /* We check for obvious errors in the output buffer length and offset */
2569         if (*plen == 0)
2570                 goto ioctl_exit; /* server returned no data */
2571         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2572                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2573                 *plen = 0;
2574                 rc = -EIO;
2575                 goto ioctl_exit;
2576         }
2577
2578         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2579                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2580                         le32_to_cpu(rsp->OutputOffset));
2581                 *plen = 0;
2582                 rc = -EIO;
2583                 goto ioctl_exit;
2584         }
2585
2586         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2587                             *plen, GFP_KERNEL);
2588         if (*out_data == NULL) {
2589                 rc = -ENOMEM;
2590                 goto ioctl_exit;
2591         }
2592
2593 ioctl_exit:
2594         free_rsp_buf(resp_buftype, rsp);
2595         return rc;
2596 }
2597
2598 /*
2599  *   Individual callers to ioctl worker function follow
2600  */
2601
2602 int
2603 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2604                      u64 persistent_fid, u64 volatile_fid)
2605 {
2606         int rc;
2607         struct  compress_ioctl fsctl_input;
2608         char *ret_data = NULL;
2609
2610         fsctl_input.CompressionState =
2611                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2612
2613         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2614                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2615                         (char *)&fsctl_input /* data input */,
2616                         2 /* in data len */, &ret_data /* out data */, NULL);
2617
2618         cifs_dbg(FYI, "set compression rc %d\n", rc);
2619
2620         return rc;
2621 }
2622
2623 int
2624 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2625                 u64 persistent_fid, u64 volatile_fid)
2626 {
2627         struct smb2_close_req *req;
2628         struct kvec *iov = rqst->rq_iov;
2629         unsigned int total_len;
2630         int rc;
2631
2632         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2633         if (rc)
2634                 return rc;
2635
2636         req->PersistentFileId = persistent_fid;
2637         req->VolatileFileId = volatile_fid;
2638         iov[0].iov_base = (char *)req;
2639         iov[0].iov_len = total_len;
2640
2641         return 0;
2642 }
2643
2644 void
2645 SMB2_close_free(struct smb_rqst *rqst)
2646 {
2647         if (rqst && rqst->rq_iov)
2648                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2649 }
2650
2651 int
2652 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2653                  u64 persistent_fid, u64 volatile_fid, int flags)
2654 {
2655         struct smb_rqst rqst;
2656         struct smb2_close_rsp *rsp = NULL;
2657         struct cifs_ses *ses = tcon->ses;
2658         struct kvec iov[1];
2659         struct kvec rsp_iov;
2660         int resp_buftype = CIFS_NO_BUFFER;
2661         int rc = 0;
2662
2663         cifs_dbg(FYI, "Close\n");
2664
2665         if (!ses || !(ses->server))
2666                 return -EIO;
2667
2668         if (smb3_encryption_required(tcon))
2669                 flags |= CIFS_TRANSFORM_REQ;
2670
2671         memset(&rqst, 0, sizeof(struct smb_rqst));
2672         memset(&iov, 0, sizeof(iov));
2673         rqst.rq_iov = iov;
2674         rqst.rq_nvec = 1;
2675
2676         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2677         if (rc)
2678                 goto close_exit;
2679
2680         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2681         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2682
2683         if (rc != 0) {
2684                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2685                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2686                                      rc);
2687                 goto close_exit;
2688         }
2689
2690         atomic_dec(&tcon->num_remote_opens);
2691
2692         /* BB FIXME - decode close response, update inode for caching */
2693
2694 close_exit:
2695         SMB2_close_free(&rqst);
2696         free_rsp_buf(resp_buftype, rsp);
2697         return rc;
2698 }
2699
2700 int
2701 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2702            u64 persistent_fid, u64 volatile_fid)
2703 {
2704         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2705 }
2706
2707 int
2708 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2709                   struct kvec *iov, unsigned int min_buf_size)
2710 {
2711         unsigned int smb_len = iov->iov_len;
2712         char *end_of_smb = smb_len + (char *)iov->iov_base;
2713         char *begin_of_buf = offset + (char *)iov->iov_base;
2714         char *end_of_buf = begin_of_buf + buffer_length;
2715
2716
2717         if (buffer_length < min_buf_size) {
2718                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2719                          buffer_length, min_buf_size);
2720                 return -EINVAL;
2721         }
2722
2723         /* check if beyond RFC1001 maximum length */
2724         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2725                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2726                          buffer_length, smb_len);
2727                 return -EINVAL;
2728         }
2729
2730         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2731                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2732                 return -EINVAL;
2733         }
2734
2735         return 0;
2736 }
2737
2738 /*
2739  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2740  * Caller must free buffer.
2741  */
2742 int
2743 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2744                            struct kvec *iov, unsigned int minbufsize,
2745                            char *data)
2746 {
2747         char *begin_of_buf = offset + (char *)iov->iov_base;
2748         int rc;
2749
2750         if (!data)
2751                 return -EINVAL;
2752
2753         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2754         if (rc)
2755                 return rc;
2756
2757         memcpy(data, begin_of_buf, buffer_length);
2758
2759         return 0;
2760 }
2761
2762 int
2763 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2764                      u64 persistent_fid, u64 volatile_fid,
2765                      u8 info_class, u8 info_type, u32 additional_info,
2766                      size_t output_len, size_t input_len, void *input)
2767 {
2768         struct smb2_query_info_req *req;
2769         struct kvec *iov = rqst->rq_iov;
2770         unsigned int total_len;
2771         int rc;
2772
2773         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2774                              &total_len);
2775         if (rc)
2776                 return rc;
2777
2778         req->InfoType = info_type;
2779         req->FileInfoClass = info_class;
2780         req->PersistentFileId = persistent_fid;
2781         req->VolatileFileId = volatile_fid;
2782         req->AdditionalInformation = cpu_to_le32(additional_info);
2783
2784         req->OutputBufferLength = cpu_to_le32(output_len);
2785         if (input_len) {
2786                 req->InputBufferLength = cpu_to_le32(input_len);
2787                 /* total_len for smb query request never close to le16 max */
2788                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2789                 memcpy(req->Buffer, input, input_len);
2790         }
2791
2792         iov[0].iov_base = (char *)req;
2793         /* 1 for Buffer */
2794         iov[0].iov_len = total_len - 1 + input_len;
2795         return 0;
2796 }
2797
2798 void
2799 SMB2_query_info_free(struct smb_rqst *rqst)
2800 {
2801         if (rqst && rqst->rq_iov)
2802                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2803 }
2804
2805 static int
2806 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2807            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2808            u32 additional_info, size_t output_len, size_t min_len, void **data,
2809                 u32 *dlen)
2810 {
2811         struct smb_rqst rqst;
2812         struct smb2_query_info_rsp *rsp = NULL;
2813         struct kvec iov[1];
2814         struct kvec rsp_iov;
2815         int rc = 0;
2816         int resp_buftype = CIFS_NO_BUFFER;
2817         struct cifs_ses *ses = tcon->ses;
2818         int flags = 0;
2819         bool allocated = false;
2820
2821         cifs_dbg(FYI, "Query Info\n");
2822
2823         if (!ses || !(ses->server))
2824                 return -EIO;
2825
2826         if (smb3_encryption_required(tcon))
2827                 flags |= CIFS_TRANSFORM_REQ;
2828
2829         memset(&rqst, 0, sizeof(struct smb_rqst));
2830         memset(&iov, 0, sizeof(iov));
2831         rqst.rq_iov = iov;
2832         rqst.rq_nvec = 1;
2833
2834         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2835                                   info_class, info_type, additional_info,
2836                                   output_len, 0, NULL);
2837         if (rc)
2838                 goto qinf_exit;
2839
2840         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2841         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2842
2843         if (rc) {
2844                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2845                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2846                                 ses->Suid, info_class, (__u32)info_type, rc);
2847                 goto qinf_exit;
2848         }
2849
2850         if (dlen) {
2851                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2852                 if (!*data) {
2853                         *data = kmalloc(*dlen, GFP_KERNEL);
2854                         if (!*data) {
2855                                 cifs_dbg(VFS,
2856                                         "Error %d allocating memory for acl\n",
2857                                         rc);
2858                                 *dlen = 0;
2859                                 rc = -ENOMEM;
2860                                 goto qinf_exit;
2861                         }
2862                         allocated = true;
2863                 }
2864         }
2865
2866         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2867                                         le32_to_cpu(rsp->OutputBufferLength),
2868                                         &rsp_iov, min_len, *data);
2869         if (rc && allocated) {
2870                 kfree(*data);
2871                 *data = NULL;
2872                 *dlen = 0;
2873         }
2874
2875 qinf_exit:
2876         SMB2_query_info_free(&rqst);
2877         free_rsp_buf(resp_buftype, rsp);
2878         return rc;
2879 }
2880
2881 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2882         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2883 {
2884         return query_info(xid, tcon, persistent_fid, volatile_fid,
2885                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2886                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2887                           sizeof(struct smb2_file_all_info), (void **)&data,
2888                           NULL);
2889 }
2890
2891 int
2892 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2893                 u64 persistent_fid, u64 volatile_fid,
2894                 void **data, u32 *plen)
2895 {
2896         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2897         *plen = 0;
2898
2899         return query_info(xid, tcon, persistent_fid, volatile_fid,
2900                           0, SMB2_O_INFO_SECURITY, additional_info,
2901                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2902 }
2903
2904 int
2905 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2906                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2907 {
2908         return query_info(xid, tcon, persistent_fid, volatile_fid,
2909                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2910                           sizeof(struct smb2_file_internal_info),
2911                           sizeof(struct smb2_file_internal_info),
2912                           (void **)&uniqueid, NULL);
2913 }
2914
2915 /*
2916  * This is a no-op for now. We're not really interested in the reply, but
2917  * rather in the fact that the server sent one and that server->lstrp
2918  * gets updated.
2919  *
2920  * FIXME: maybe we should consider checking that the reply matches request?
2921  */
2922 static void
2923 smb2_echo_callback(struct mid_q_entry *mid)
2924 {
2925         struct TCP_Server_Info *server = mid->callback_data;
2926         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2927         unsigned int credits_received = 0;
2928
2929         if (mid->mid_state == MID_RESPONSE_RECEIVED
2930             || mid->mid_state == MID_RESPONSE_MALFORMED)
2931                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2932
2933         DeleteMidQEntry(mid);
2934         add_credits(server, credits_received, CIFS_ECHO_OP);
2935 }
2936
2937 void smb2_reconnect_server(struct work_struct *work)
2938 {
2939         struct TCP_Server_Info *server = container_of(work,
2940                                         struct TCP_Server_Info, reconnect.work);
2941         struct cifs_ses *ses;
2942         struct cifs_tcon *tcon, *tcon2;
2943         struct list_head tmp_list;
2944         int tcon_exist = false;
2945         int rc;
2946         int resched = false;
2947
2948
2949         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2950         mutex_lock(&server->reconnect_mutex);
2951
2952         INIT_LIST_HEAD(&tmp_list);
2953         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2954
2955         spin_lock(&cifs_tcp_ses_lock);
2956         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2957                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2958                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2959                                 tcon->tc_count++;
2960                                 list_add_tail(&tcon->rlist, &tmp_list);
2961                                 tcon_exist = true;
2962                         }
2963                 }
2964                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2965                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2966                         tcon_exist = true;
2967                 }
2968         }
2969         /*
2970          * Get the reference to server struct to be sure that the last call of
2971          * cifs_put_tcon() in the loop below won't release the server pointer.
2972          */
2973         if (tcon_exist)
2974                 server->srv_count++;
2975
2976         spin_unlock(&cifs_tcp_ses_lock);
2977
2978         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2979                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2980                 if (!rc)
2981                         cifs_reopen_persistent_handles(tcon);
2982                 else
2983                         resched = true;
2984                 list_del_init(&tcon->rlist);
2985                 cifs_put_tcon(tcon);
2986         }
2987
2988         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2989         if (resched)
2990                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2991         mutex_unlock(&server->reconnect_mutex);
2992
2993         /* now we can safely release srv struct */
2994         if (tcon_exist)
2995                 cifs_put_tcp_session(server, 1);
2996 }
2997
2998 int
2999 SMB2_echo(struct TCP_Server_Info *server)
3000 {
3001         struct smb2_echo_req *req;
3002         int rc = 0;
3003         struct kvec iov[1];
3004         struct smb_rqst rqst = { .rq_iov = iov,
3005                                  .rq_nvec = 1 };
3006         unsigned int total_len;
3007
3008         cifs_dbg(FYI, "In echo request\n");
3009
3010         if (server->tcpStatus == CifsNeedNegotiate) {
3011                 /* No need to send echo on newly established connections */
3012                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3013                 return rc;
3014         }
3015
3016         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3017         if (rc)
3018                 return rc;
3019
3020         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3021
3022         iov[0].iov_len = total_len;
3023         iov[0].iov_base = (char *)req;
3024
3025         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3026                              server, CIFS_ECHO_OP);
3027         if (rc)
3028                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3029
3030         cifs_small_buf_release(req);
3031         return rc;
3032 }
3033
3034 int
3035 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3036            u64 volatile_fid)
3037 {
3038         struct smb_rqst rqst;
3039         struct smb2_flush_req *req;
3040         struct cifs_ses *ses = tcon->ses;
3041         struct kvec iov[1];
3042         struct kvec rsp_iov;
3043         int resp_buftype;
3044         int rc = 0;
3045         int flags = 0;
3046         unsigned int total_len;
3047
3048         cifs_dbg(FYI, "Flush\n");
3049
3050         if (!ses || !(ses->server))
3051                 return -EIO;
3052
3053         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3054         if (rc)
3055                 return rc;
3056
3057         if (smb3_encryption_required(tcon))
3058                 flags |= CIFS_TRANSFORM_REQ;
3059
3060         req->PersistentFileId = persistent_fid;
3061         req->VolatileFileId = volatile_fid;
3062
3063         iov[0].iov_base = (char *)req;
3064         iov[0].iov_len = total_len;
3065
3066         memset(&rqst, 0, sizeof(struct smb_rqst));
3067         rqst.rq_iov = iov;
3068         rqst.rq_nvec = 1;
3069
3070         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3071         cifs_small_buf_release(req);
3072
3073         if (rc != 0) {
3074                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3075                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3076                                      rc);
3077         }
3078
3079         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3080         return rc;
3081 }
3082
3083 /*
3084  * To form a chain of read requests, any read requests after the first should
3085  * have the end_of_chain boolean set to true.
3086  */
3087 static int
3088 smb2_new_read_req(void **buf, unsigned int *total_len,
3089         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3090         unsigned int remaining_bytes, int request_type)
3091 {
3092         int rc = -EACCES;
3093         struct smb2_read_plain_req *req = NULL;
3094         struct smb2_sync_hdr *shdr;
3095         struct TCP_Server_Info *server;
3096
3097         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3098                                  total_len);
3099         if (rc)
3100                 return rc;
3101
3102         server = io_parms->tcon->ses->server;
3103         if (server == NULL)
3104                 return -ECONNABORTED;
3105
3106         shdr = &req->sync_hdr;
3107         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3108
3109         req->PersistentFileId = io_parms->persistent_fid;
3110         req->VolatileFileId = io_parms->volatile_fid;
3111         req->ReadChannelInfoOffset = 0; /* reserved */
3112         req->ReadChannelInfoLength = 0; /* reserved */
3113         req->Channel = 0; /* reserved */
3114         req->MinimumCount = 0;
3115         req->Length = cpu_to_le32(io_parms->length);
3116         req->Offset = cpu_to_le64(io_parms->offset);
3117 #ifdef CONFIG_CIFS_SMB_DIRECT
3118         /*
3119          * If we want to do a RDMA write, fill in and append
3120          * smbd_buffer_descriptor_v1 to the end of read request
3121          */
3122         if (server->rdma && rdata && !server->sign &&
3123                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3124
3125                 struct smbd_buffer_descriptor_v1 *v1;
3126                 bool need_invalidate =
3127                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3128
3129                 rdata->mr = smbd_register_mr(
3130                                 server->smbd_conn, rdata->pages,
3131                                 rdata->nr_pages, rdata->page_offset,
3132                                 rdata->tailsz, true, need_invalidate);
3133                 if (!rdata->mr)
3134                         return -ENOBUFS;
3135
3136                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3137                 if (need_invalidate)
3138                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3139                 req->ReadChannelInfoOffset =
3140                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3141                 req->ReadChannelInfoLength =
3142                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3143                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3144                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3145                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3146                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3147
3148                 *total_len += sizeof(*v1) - 1;
3149         }
3150 #endif
3151         if (request_type & CHAINED_REQUEST) {
3152                 if (!(request_type & END_OF_CHAIN)) {
3153                         /* next 8-byte aligned request */
3154                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3155                         shdr->NextCommand = cpu_to_le32(*total_len);
3156                 } else /* END_OF_CHAIN */
3157                         shdr->NextCommand = 0;
3158                 if (request_type & RELATED_REQUEST) {
3159                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3160                         /*
3161                          * Related requests use info from previous read request
3162                          * in chain.
3163                          */
3164                         shdr->SessionId = 0xFFFFFFFF;
3165                         shdr->TreeId = 0xFFFFFFFF;
3166                         req->PersistentFileId = 0xFFFFFFFF;
3167                         req->VolatileFileId = 0xFFFFFFFF;
3168                 }
3169         }
3170         if (remaining_bytes > io_parms->length)
3171                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3172         else
3173                 req->RemainingBytes = 0;
3174
3175         *buf = req;
3176         return rc;
3177 }
3178
3179 static void
3180 smb2_readv_callback(struct mid_q_entry *mid)
3181 {
3182         struct cifs_readdata *rdata = mid->callback_data;
3183         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3184         struct TCP_Server_Info *server = tcon->ses->server;
3185         struct smb2_sync_hdr *shdr =
3186                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3187         unsigned int credits_received = 0;
3188         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3189                                  .rq_nvec = 2,
3190                                  .rq_pages = rdata->pages,
3191                                  .rq_offset = rdata->page_offset,
3192                                  .rq_npages = rdata->nr_pages,
3193                                  .rq_pagesz = rdata->pagesz,
3194                                  .rq_tailsz = rdata->tailsz };
3195
3196         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3197                  __func__, mid->mid, mid->mid_state, rdata->result,
3198                  rdata->bytes);
3199
3200         switch (mid->mid_state) {
3201         case MID_RESPONSE_RECEIVED:
3202                 credits_received = le16_to_cpu(shdr->CreditRequest);
3203                 /* result already set, check signature */
3204                 if (server->sign && !mid->decrypted) {
3205                         int rc;
3206
3207                         rc = smb2_verify_signature(&rqst, server);
3208                         if (rc)
3209                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3210                                          rc);
3211                 }
3212                 /* FIXME: should this be counted toward the initiating task? */
3213                 task_io_account_read(rdata->got_bytes);
3214                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3215                 break;
3216         case MID_REQUEST_SUBMITTED:
3217         case MID_RETRY_NEEDED:
3218                 rdata->result = -EAGAIN;
3219                 if (server->sign && rdata->got_bytes)
3220                         /* reset bytes number since we can not check a sign */
3221                         rdata->got_bytes = 0;
3222                 /* FIXME: should this be counted toward the initiating task? */
3223                 task_io_account_read(rdata->got_bytes);
3224                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3225                 break;
3226         case MID_RESPONSE_MALFORMED:
3227                 credits_received = le16_to_cpu(shdr->CreditRequest);
3228                 /* fall through */
3229         default:
3230                 if (rdata->result != -ENODATA)
3231                         rdata->result = -EIO;
3232         }
3233 #ifdef CONFIG_CIFS_SMB_DIRECT
3234         /*
3235          * If this rdata has a memmory registered, the MR can be freed
3236          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3237          * because they have limited number and are used for future I/Os
3238          */
3239         if (rdata->mr) {
3240                 smbd_deregister_mr(rdata->mr);
3241                 rdata->mr = NULL;
3242         }
3243 #endif
3244         if (rdata->result && rdata->result != -ENODATA) {
3245                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3246                 trace_smb3_read_err(0 /* xid */,
3247                                     rdata->cfile->fid.persistent_fid,
3248                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3249                                     rdata->bytes, rdata->result);
3250         } else
3251                 trace_smb3_read_done(0 /* xid */,
3252                                      rdata->cfile->fid.persistent_fid,
3253                                      tcon->tid, tcon->ses->Suid,
3254                                      rdata->offset, rdata->got_bytes);
3255
3256         queue_work(cifsiod_wq, &rdata->work);
3257         DeleteMidQEntry(mid);
3258         add_credits(server, credits_received, 0);
3259 }
3260
3261 /* smb2_async_readv - send an async read, and set up mid to handle result */
3262 int
3263 smb2_async_readv(struct cifs_readdata *rdata)
3264 {
3265         int rc, flags = 0;
3266         char *buf;
3267         struct smb2_sync_hdr *shdr;
3268         struct cifs_io_parms io_parms;
3269         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3270                                  .rq_nvec = 1 };
3271         struct TCP_Server_Info *server;
3272         unsigned int total_len;
3273
3274         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3275                  __func__, rdata->offset, rdata->bytes);
3276
3277         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3278         io_parms.offset = rdata->offset;
3279         io_parms.length = rdata->bytes;
3280         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3281         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3282         io_parms.pid = rdata->pid;
3283
3284         server = io_parms.tcon->ses->server;
3285
3286         rc = smb2_new_read_req(
3287                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3288         if (rc) {
3289                 if (rc == -EAGAIN && rdata->credits) {
3290                         /* credits was reset by reconnect */
3291                         rdata->credits = 0;
3292                         /* reduce in_flight value since we won't send the req */
3293                         spin_lock(&server->req_lock);
3294                         server->in_flight--;
3295                         spin_unlock(&server->req_lock);
3296                 }
3297                 return rc;
3298         }
3299
3300         if (smb3_encryption_required(io_parms.tcon))
3301                 flags |= CIFS_TRANSFORM_REQ;
3302
3303         rdata->iov[0].iov_base = buf;
3304         rdata->iov[0].iov_len = total_len;
3305
3306         shdr = (struct smb2_sync_hdr *)buf;
3307
3308         if (rdata->credits) {
3309                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3310                                                 SMB2_MAX_BUFFER_SIZE));
3311                 shdr->CreditRequest =
3312                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3313                 spin_lock(&server->req_lock);
3314                 server->credits += rdata->credits -
3315                                                 le16_to_cpu(shdr->CreditCharge);
3316                 spin_unlock(&server->req_lock);
3317                 wake_up(&server->request_q);
3318                 rdata->credits = le16_to_cpu(shdr->CreditCharge);
3319                 flags |= CIFS_HAS_CREDITS;
3320         }
3321
3322         kref_get(&rdata->refcount);
3323         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3324                              cifs_readv_receive, smb2_readv_callback,
3325                              smb3_handle_read_data, rdata, flags);
3326         if (rc) {
3327                 kref_put(&rdata->refcount, cifs_readdata_release);
3328                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3329                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3330                                     io_parms.tcon->tid,
3331                                     io_parms.tcon->ses->Suid,
3332                                     io_parms.offset, io_parms.length, rc);
3333         }
3334
3335         cifs_small_buf_release(buf);
3336         return rc;
3337 }
3338
3339 int
3340 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3341           unsigned int *nbytes, char **buf, int *buf_type)
3342 {
3343         struct smb_rqst rqst;
3344         int resp_buftype, rc = -EACCES;
3345         struct smb2_read_plain_req *req = NULL;
3346         struct smb2_read_rsp *rsp = NULL;
3347         struct kvec iov[1];
3348         struct kvec rsp_iov;
3349         unsigned int total_len;
3350         int flags = CIFS_LOG_ERROR;
3351         struct cifs_ses *ses = io_parms->tcon->ses;
3352
3353         *nbytes = 0;
3354         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3355         if (rc)
3356                 return rc;
3357
3358         if (smb3_encryption_required(io_parms->tcon))
3359                 flags |= CIFS_TRANSFORM_REQ;
3360
3361         iov[0].iov_base = (char *)req;
3362         iov[0].iov_len = total_len;
3363
3364         memset(&rqst, 0, sizeof(struct smb_rqst));
3365         rqst.rq_iov = iov;
3366         rqst.rq_nvec = 1;
3367
3368         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3369         cifs_small_buf_release(req);
3370
3371         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3372
3373         if (rc) {
3374                 if (rc != -ENODATA) {
3375                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3376                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3377                         trace_smb3_read_err(xid, req->PersistentFileId,
3378                                             io_parms->tcon->tid, ses->Suid,
3379                                             io_parms->offset, io_parms->length,
3380                                             rc);
3381                 }
3382                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3383                 return rc == -ENODATA ? 0 : rc;
3384         } else
3385                 trace_smb3_read_done(xid, req->PersistentFileId,
3386                                     io_parms->tcon->tid, ses->Suid,
3387                                     io_parms->offset, io_parms->length);
3388
3389         *nbytes = le32_to_cpu(rsp->DataLength);
3390         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3391             (*nbytes > io_parms->length)) {
3392                 cifs_dbg(FYI, "bad length %d for count %d\n",
3393                          *nbytes, io_parms->length);
3394                 rc = -EIO;
3395                 *nbytes = 0;
3396         }
3397
3398         if (*buf) {
3399                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3400                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3401         } else if (resp_buftype != CIFS_NO_BUFFER) {
3402                 *buf = rsp_iov.iov_base;
3403                 if (resp_buftype == CIFS_SMALL_BUFFER)
3404                         *buf_type = CIFS_SMALL_BUFFER;
3405                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3406                         *buf_type = CIFS_LARGE_BUFFER;
3407         }
3408         return rc;
3409 }
3410
3411 /*
3412  * Check the mid_state and signature on received buffer (if any), and queue the
3413  * workqueue completion task.
3414  */
3415 static void
3416 smb2_writev_callback(struct mid_q_entry *mid)
3417 {
3418         struct cifs_writedata *wdata = mid->callback_data;
3419         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3420         unsigned int written;
3421         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3422         unsigned int credits_received = 0;
3423
3424         switch (mid->mid_state) {
3425         case MID_RESPONSE_RECEIVED:
3426                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3427                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3428                 if (wdata->result != 0)
3429                         break;
3430
3431                 written = le32_to_cpu(rsp->DataLength);
3432                 /*
3433                  * Mask off high 16 bits when bytes written as returned
3434                  * by the server is greater than bytes requested by the
3435                  * client. OS/2 servers are known to set incorrect
3436                  * CountHigh values.
3437                  */
3438                 if (written > wdata->bytes)
3439                         written &= 0xFFFF;
3440
3441                 if (written < wdata->bytes)
3442                         wdata->result = -ENOSPC;
3443                 else
3444                         wdata->bytes = written;
3445                 break;
3446         case MID_REQUEST_SUBMITTED:
3447         case MID_RETRY_NEEDED:
3448                 wdata->result = -EAGAIN;
3449                 break;
3450         case MID_RESPONSE_MALFORMED:
3451                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3452                 /* fall through */
3453         default:
3454                 wdata->result = -EIO;
3455                 break;
3456         }
3457 #ifdef CONFIG_CIFS_SMB_DIRECT
3458         /*
3459          * If this wdata has a memory registered, the MR can be freed
3460          * The number of MRs available is limited, it's important to recover
3461          * used MR as soon as I/O is finished. Hold MR longer in the later
3462          * I/O process can possibly result in I/O deadlock due to lack of MR
3463          * to send request on I/O retry
3464          */
3465         if (wdata->mr) {
3466                 smbd_deregister_mr(wdata->mr);
3467                 wdata->mr = NULL;
3468         }
3469 #endif
3470         if (wdata->result) {
3471                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3472                 trace_smb3_write_err(0 /* no xid */,
3473                                      wdata->cfile->fid.persistent_fid,
3474                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3475                                      wdata->bytes, wdata->result);
3476         } else
3477                 trace_smb3_write_done(0 /* no xid */,
3478                                       wdata->cfile->fid.persistent_fid,
3479                                       tcon->tid, tcon->ses->Suid,
3480                                       wdata->offset, wdata->bytes);
3481
3482         queue_work(cifsiod_wq, &wdata->work);
3483         DeleteMidQEntry(mid);
3484         add_credits(tcon->ses->server, credits_received, 0);
3485 }
3486
3487 /* smb2_async_writev - send an async write, and set up mid to handle result */
3488 int
3489 smb2_async_writev(struct cifs_writedata *wdata,
3490                   void (*release)(struct kref *kref))
3491 {
3492         int rc = -EACCES, flags = 0;
3493         struct smb2_write_req *req = NULL;
3494         struct smb2_sync_hdr *shdr;
3495         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3496         struct TCP_Server_Info *server = tcon->ses->server;
3497         struct kvec iov[1];
3498         struct smb_rqst rqst = { };
3499         unsigned int total_len;
3500
3501         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3502         if (rc) {
3503                 if (rc == -EAGAIN && wdata->credits) {
3504                         /* credits was reset by reconnect */
3505                         wdata->credits = 0;
3506                         /* reduce in_flight value since we won't send the req */
3507                         spin_lock(&server->req_lock);
3508                         server->in_flight--;
3509                         spin_unlock(&server->req_lock);
3510                 }
3511                 goto async_writev_out;
3512         }
3513
3514         if (smb3_encryption_required(tcon))
3515                 flags |= CIFS_TRANSFORM_REQ;
3516
3517         shdr = (struct smb2_sync_hdr *)req;
3518         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3519
3520         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3521         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3522         req->WriteChannelInfoOffset = 0;
3523         req->WriteChannelInfoLength = 0;
3524         req->Channel = 0;
3525         req->Offset = cpu_to_le64(wdata->offset);
3526         req->DataOffset = cpu_to_le16(
3527                                 offsetof(struct smb2_write_req, Buffer));
3528         req->RemainingBytes = 0;
3529 #ifdef CONFIG_CIFS_SMB_DIRECT
3530         /*
3531          * If we want to do a server RDMA read, fill in and append
3532          * smbd_buffer_descriptor_v1 to the end of write request
3533          */
3534         if (server->rdma && !server->sign && wdata->bytes >=
3535                 server->smbd_conn->rdma_readwrite_threshold) {
3536
3537                 struct smbd_buffer_descriptor_v1 *v1;
3538                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3539
3540                 wdata->mr = smbd_register_mr(
3541                                 server->smbd_conn, wdata->pages,
3542                                 wdata->nr_pages, wdata->page_offset,
3543                                 wdata->tailsz, false, need_invalidate);
3544                 if (!wdata->mr) {
3545                         rc = -ENOBUFS;
3546                         goto async_writev_out;
3547                 }
3548                 req->Length = 0;
3549                 req->DataOffset = 0;
3550                 if (wdata->nr_pages > 1)
3551                         req->RemainingBytes =
3552                                 cpu_to_le32(
3553                                         (wdata->nr_pages - 1) * wdata->pagesz -
3554                                         wdata->page_offset + wdata->tailsz
3555                                 );
3556                 else
3557                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3558                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3559                 if (need_invalidate)
3560                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3561                 req->WriteChannelInfoOffset =
3562                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3563                 req->WriteChannelInfoLength =
3564                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3565                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3566                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3567                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3568                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3569         }
3570 #endif
3571         iov[0].iov_len = total_len - 1;
3572         iov[0].iov_base = (char *)req;
3573
3574         rqst.rq_iov = iov;
3575         rqst.rq_nvec = 1;
3576         rqst.rq_pages = wdata->pages;
3577         rqst.rq_offset = wdata->page_offset;
3578         rqst.rq_npages = wdata->nr_pages;
3579         rqst.rq_pagesz = wdata->pagesz;
3580         rqst.rq_tailsz = wdata->tailsz;
3581 #ifdef CONFIG_CIFS_SMB_DIRECT
3582         if (wdata->mr) {
3583                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3584                 rqst.rq_npages = 0;
3585         }
3586 #endif
3587         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3588                  wdata->offset, wdata->bytes);
3589
3590 #ifdef CONFIG_CIFS_SMB_DIRECT
3591         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3592         if (!wdata->mr)
3593                 req->Length = cpu_to_le32(wdata->bytes);
3594 #else
3595         req->Length = cpu_to_le32(wdata->bytes);
3596 #endif
3597
3598         if (wdata->credits) {
3599                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3600                                                     SMB2_MAX_BUFFER_SIZE));
3601                 shdr->CreditRequest =
3602                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3603                 spin_lock(&server->req_lock);
3604                 server->credits += wdata->credits -
3605                                                 le16_to_cpu(shdr->CreditCharge);
3606                 spin_unlock(&server->req_lock);
3607                 wake_up(&server->request_q);
3608                 wdata->credits = le16_to_cpu(shdr->CreditCharge);
3609                 flags |= CIFS_HAS_CREDITS;
3610         }
3611
3612         kref_get(&wdata->refcount);
3613         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3614                              wdata, flags);
3615
3616         if (rc) {
3617                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3618                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3619                                      wdata->bytes, rc);
3620                 kref_put(&wdata->refcount, release);
3621                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3622         }
3623
3624 async_writev_out:
3625         cifs_small_buf_release(req);
3626         return rc;
3627 }
3628
3629 /*
3630  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3631  * The length field from io_parms must be at least 1 and indicates a number of
3632  * elements with data to write that begins with position 1 in iov array. All
3633  * data length is specified by count.
3634  */
3635 int
3636 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3637            unsigned int *nbytes, struct kvec *iov, int n_vec)
3638 {
3639         struct smb_rqst rqst;
3640         int rc = 0;
3641         struct smb2_write_req *req = NULL;
3642         struct smb2_write_rsp *rsp = NULL;
3643         int resp_buftype;
3644         struct kvec rsp_iov;
3645         int flags = 0;
3646         unsigned int total_len;
3647
3648         *nbytes = 0;
3649
3650         if (n_vec < 1)
3651                 return rc;
3652
3653         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3654                              &total_len);
3655         if (rc)
3656                 return rc;
3657
3658         if (io_parms->tcon->ses->server == NULL)
3659                 return -ECONNABORTED;
3660
3661         if (smb3_encryption_required(io_parms->tcon))
3662                 flags |= CIFS_TRANSFORM_REQ;
3663
3664         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3665
3666         req->PersistentFileId = io_parms->persistent_fid;
3667         req->VolatileFileId = io_parms->volatile_fid;
3668         req->WriteChannelInfoOffset = 0;
3669         req->WriteChannelInfoLength = 0;
3670         req->Channel = 0;
3671         req->Length = cpu_to_le32(io_parms->length);
3672         req->Offset = cpu_to_le64(io_parms->offset);
3673         req->DataOffset = cpu_to_le16(
3674                                 offsetof(struct smb2_write_req, Buffer));
3675         req->RemainingBytes = 0;
3676
3677         iov[0].iov_base = (char *)req;
3678         /* 1 for Buffer */
3679         iov[0].iov_len = total_len - 1;
3680
3681         memset(&rqst, 0, sizeof(struct smb_rqst));
3682         rqst.rq_iov = iov;
3683         rqst.rq_nvec = n_vec + 1;
3684
3685         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3686                             &resp_buftype, flags, &rsp_iov);
3687         cifs_small_buf_release(req);
3688         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3689
3690         if (rc) {
3691                 trace_smb3_write_err(xid, req->PersistentFileId,
3692                                      io_parms->tcon->tid,
3693                                      io_parms->tcon->ses->Suid,
3694                                      io_parms->offset, io_parms->length, rc);
3695                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3696                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3697         } else {
3698                 *nbytes = le32_to_cpu(rsp->DataLength);
3699                 trace_smb3_write_done(xid, req->PersistentFileId,
3700                                      io_parms->tcon->tid,
3701                                      io_parms->tcon->ses->Suid,
3702                                      io_parms->offset, *nbytes);
3703         }
3704
3705         free_rsp_buf(resp_buftype, rsp);
3706         return rc;
3707 }
3708
3709 static unsigned int
3710 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3711 {
3712         int len;
3713         unsigned int entrycount = 0;
3714         unsigned int next_offset = 0;
3715         char *entryptr;
3716         FILE_DIRECTORY_INFO *dir_info;
3717
3718         if (bufstart == NULL)
3719                 return 0;
3720
3721         entryptr = bufstart;
3722
3723         while (1) {
3724                 if (entryptr + next_offset < entryptr ||
3725                     entryptr + next_offset > end_of_buf ||
3726                     entryptr + next_offset + size > end_of_buf) {
3727                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3728                         break;
3729                 }
3730
3731                 entryptr = entryptr + next_offset;
3732                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3733
3734                 len = le32_to_cpu(dir_info->FileNameLength);
3735                 if (entryptr + len < entryptr ||
3736                     entryptr + len > end_of_buf ||
3737                     entryptr + len + size > end_of_buf) {
3738                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3739                                  end_of_buf);
3740                         break;
3741                 }
3742
3743                 *lastentry = entryptr;
3744                 entrycount++;
3745
3746                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3747                 if (!next_offset)
3748                         break;
3749         }
3750
3751         return entrycount;
3752 }
3753
3754 /*
3755  * Readdir/FindFirst
3756  */
3757 int
3758 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3759                      u64 persistent_fid, u64 volatile_fid, int index,
3760                      struct cifs_search_info *srch_inf)
3761 {
3762         struct smb_rqst rqst;
3763         struct smb2_query_directory_req *req;
3764         struct smb2_query_directory_rsp *rsp = NULL;
3765         struct kvec iov[2];
3766         struct kvec rsp_iov;
3767         int rc = 0;
3768         int len;
3769         int resp_buftype = CIFS_NO_BUFFER;
3770         unsigned char *bufptr;
3771         struct TCP_Server_Info *server;
3772         struct cifs_ses *ses = tcon->ses;
3773         __le16 asteriks = cpu_to_le16('*');
3774         char *end_of_smb;
3775         unsigned int output_size = CIFSMaxBufSize;
3776         size_t info_buf_size;
3777         int flags = 0;
3778         unsigned int total_len;
3779
3780         if (ses && (ses->server))
3781                 server = ses->server;
3782         else
3783                 return -EIO;
3784
3785         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3786                              &total_len);
3787         if (rc)
3788                 return rc;
3789
3790         if (smb3_encryption_required(tcon))
3791                 flags |= CIFS_TRANSFORM_REQ;
3792
3793         switch (srch_inf->info_level) {
3794         case SMB_FIND_FILE_DIRECTORY_INFO:
3795                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3796                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3797                 break;
3798         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3799                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3800                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3801                 break;
3802         default:
3803                 cifs_dbg(VFS, "info level %u isn't supported\n",
3804                          srch_inf->info_level);
3805                 rc = -EINVAL;
3806                 goto qdir_exit;
3807         }
3808
3809         req->FileIndex = cpu_to_le32(index);
3810         req->PersistentFileId = persistent_fid;
3811         req->VolatileFileId = volatile_fid;
3812
3813         len = 0x2;
3814         bufptr = req->Buffer;
3815         memcpy(bufptr, &asteriks, len);
3816
3817         req->FileNameOffset =
3818                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3819         req->FileNameLength = cpu_to_le16(len);
3820         /*
3821          * BB could be 30 bytes or so longer if we used SMB2 specific
3822          * buffer lengths, but this is safe and close enough.
3823          */
3824         output_size = min_t(unsigned int, output_size, server->maxBuf);
3825         output_size = min_t(unsigned int, output_size, 2 << 15);
3826         req->OutputBufferLength = cpu_to_le32(output_size);
3827
3828         iov[0].iov_base = (char *)req;
3829         /* 1 for Buffer */
3830         iov[0].iov_len = total_len - 1;
3831
3832         iov[1].iov_base = (char *)(req->Buffer);
3833         iov[1].iov_len = len;
3834
3835         memset(&rqst, 0, sizeof(struct smb_rqst));
3836         rqst.rq_iov = iov;
3837         rqst.rq_nvec = 2;
3838
3839         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3840         cifs_small_buf_release(req);
3841         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3842
3843         if (rc) {
3844                 if (rc == -ENODATA &&
3845                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3846                         srch_inf->endOfSearch = true;
3847                         rc = 0;
3848                 } else
3849                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3850                 goto qdir_exit;
3851         }
3852
3853         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3854                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3855                                info_buf_size);
3856         if (rc)
3857                 goto qdir_exit;
3858
3859         srch_inf->unicode = true;
3860
3861         if (srch_inf->ntwrk_buf_start) {
3862                 if (srch_inf->smallBuf)
3863                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3864                 else
3865                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3866         }
3867         srch_inf->ntwrk_buf_start = (char *)rsp;
3868         srch_inf->srch_entries_start = srch_inf->last_entry =
3869                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3870         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3871         srch_inf->entries_in_buffer =
3872                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3873                                     &srch_inf->last_entry, info_buf_size);
3874         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3875         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3876                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3877                  srch_inf->srch_entries_start, srch_inf->last_entry);
3878         if (resp_buftype == CIFS_LARGE_BUFFER)
3879                 srch_inf->smallBuf = false;
3880         else if (resp_buftype == CIFS_SMALL_BUFFER)
3881                 srch_inf->smallBuf = true;
3882         else
3883                 cifs_dbg(VFS, "illegal search buffer type\n");
3884
3885         return rc;
3886
3887 qdir_exit:
3888         free_rsp_buf(resp_buftype, rsp);
3889         return rc;
3890 }
3891
3892 int
3893 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3894                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3895                u8 info_type, u32 additional_info,
3896                 void **data, unsigned int *size)
3897 {
3898         struct smb2_set_info_req *req;
3899         struct kvec *iov = rqst->rq_iov;
3900         unsigned int i, total_len;
3901         int rc;
3902
3903         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3904         if (rc)
3905                 return rc;
3906
3907         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3908         req->InfoType = info_type;
3909         req->FileInfoClass = info_class;
3910         req->PersistentFileId = persistent_fid;
3911         req->VolatileFileId = volatile_fid;
3912         req->AdditionalInformation = cpu_to_le32(additional_info);
3913
3914         req->BufferOffset =
3915                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3916         req->BufferLength = cpu_to_le32(*size);
3917
3918         memcpy(req->Buffer, *data, *size);
3919         total_len += *size;
3920
3921         iov[0].iov_base = (char *)req;
3922         /* 1 for Buffer */
3923         iov[0].iov_len = total_len - 1;
3924
3925         for (i = 1; i < rqst->rq_nvec; i++) {
3926                 le32_add_cpu(&req->BufferLength, size[i]);
3927                 iov[i].iov_base = (char *)data[i];
3928                 iov[i].iov_len = size[i];
3929         }
3930
3931         return 0;
3932 }
3933
3934 void
3935 SMB2_set_info_free(struct smb_rqst *rqst)
3936 {
3937         if (rqst && rqst->rq_iov)
3938                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3939 }
3940
3941 static int
3942 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3943                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3944                u8 info_type, u32 additional_info, unsigned int num,
3945                 void **data, unsigned int *size)
3946 {
3947         struct smb_rqst rqst;
3948         struct smb2_set_info_rsp *rsp = NULL;
3949         struct kvec *iov;
3950         struct kvec rsp_iov;
3951         int rc = 0;
3952         int resp_buftype;
3953         struct cifs_ses *ses = tcon->ses;
3954         int flags = 0;
3955
3956         if (!ses || !(ses->server))
3957                 return -EIO;
3958
3959         if (!num)
3960                 return -EINVAL;
3961
3962         if (smb3_encryption_required(tcon))
3963                 flags |= CIFS_TRANSFORM_REQ;
3964
3965         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3966         if (!iov)
3967                 return -ENOMEM;
3968
3969         memset(&rqst, 0, sizeof(struct smb_rqst));
3970         rqst.rq_iov = iov;
3971         rqst.rq_nvec = num;
3972
3973         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
3974                                 info_class, info_type, additional_info,
3975                                 data, size);
3976         if (rc) {
3977                 kfree(iov);
3978                 return rc;
3979         }
3980
3981
3982         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
3983                             &rsp_iov);
3984         SMB2_set_info_free(&rqst);
3985         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3986
3987         if (rc != 0) {
3988                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3989                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3990                                 ses->Suid, info_class, (__u32)info_type, rc);
3991         }
3992
3993         free_rsp_buf(resp_buftype, rsp);
3994         kfree(iov);
3995         return rc;
3996 }
3997
3998 int
3999 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4000              u64 volatile_fid, u32 pid, __le64 *eof)
4001 {
4002         struct smb2_file_eof_info info;
4003         void *data;
4004         unsigned int size;
4005
4006         info.EndOfFile = *eof;
4007
4008         data = &info;
4009         size = sizeof(struct smb2_file_eof_info);
4010
4011         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4012                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4013                         0, 1, &data, &size);
4014 }
4015
4016 int
4017 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4018                 u64 persistent_fid, u64 volatile_fid,
4019                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4020 {
4021         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4022                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4023                         1, (void **)&pnntsd, &pacllen);
4024 }
4025
4026 int
4027 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4028             u64 persistent_fid, u64 volatile_fid,
4029             struct smb2_file_full_ea_info *buf, int len)
4030 {
4031         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4032                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4033                 0, 1, (void **)&buf, &len);
4034 }
4035
4036 int
4037 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4038                   const u64 persistent_fid, const u64 volatile_fid,
4039                   __u8 oplock_level)
4040 {
4041         struct smb_rqst rqst;
4042         int rc;
4043         struct smb2_oplock_break *req = NULL;
4044         struct cifs_ses *ses = tcon->ses;
4045         int flags = CIFS_OBREAK_OP;
4046         unsigned int total_len;
4047         struct kvec iov[1];
4048         struct kvec rsp_iov;
4049         int resp_buf_type;
4050
4051         cifs_dbg(FYI, "SMB2_oplock_break\n");
4052         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4053                              &total_len);
4054         if (rc)
4055                 return rc;
4056
4057         if (smb3_encryption_required(tcon))
4058                 flags |= CIFS_TRANSFORM_REQ;
4059
4060         req->VolatileFid = volatile_fid;
4061         req->PersistentFid = persistent_fid;
4062         req->OplockLevel = oplock_level;
4063         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4064
4065         flags |= CIFS_NO_RESP;
4066
4067         iov[0].iov_base = (char *)req;
4068         iov[0].iov_len = total_len;
4069
4070         memset(&rqst, 0, sizeof(struct smb_rqst));
4071         rqst.rq_iov = iov;
4072         rqst.rq_nvec = 1;
4073
4074         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4075         cifs_small_buf_release(req);
4076
4077         if (rc) {
4078                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4079                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4080         }
4081
4082         return rc;
4083 }
4084
4085 void
4086 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4087                              struct kstatfs *kst)
4088 {
4089         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4090                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4091         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4092         kst->f_bfree  = kst->f_bavail =
4093                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4094         return;
4095 }
4096
4097 static void
4098 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4099                         struct kstatfs *kst)
4100 {
4101         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4102         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4103         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4104         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4105                 kst->f_bavail = kst->f_bfree;
4106         else
4107                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4108         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4109                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4110         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4111                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4112
4113         return;
4114 }
4115
4116 static int
4117 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4118                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4119 {
4120         int rc;
4121         struct smb2_query_info_req *req;
4122         unsigned int total_len;
4123
4124         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4125
4126         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4127                 return -EIO;
4128
4129         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4130                              &total_len);
4131         if (rc)
4132                 return rc;
4133
4134         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4135         req->FileInfoClass = level;
4136         req->PersistentFileId = persistent_fid;
4137         req->VolatileFileId = volatile_fid;
4138         /* 1 for pad */
4139         req->InputBufferOffset =
4140                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4141         req->OutputBufferLength = cpu_to_le32(
4142                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4143
4144         iov->iov_base = (char *)req;
4145         iov->iov_len = total_len;
4146         return 0;
4147 }
4148
4149 int
4150 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4151               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4152 {
4153         struct smb_rqst rqst;
4154         struct smb2_query_info_rsp *rsp = NULL;
4155         struct kvec iov;
4156         struct kvec rsp_iov;
4157         int rc = 0;
4158         int resp_buftype;
4159         struct cifs_ses *ses = tcon->ses;
4160         FILE_SYSTEM_POSIX_INFO *info = NULL;
4161         int flags = 0;
4162
4163         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4164                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4165                                 persistent_fid, volatile_fid);
4166         if (rc)
4167                 return rc;
4168
4169         if (smb3_encryption_required(tcon))
4170                 flags |= CIFS_TRANSFORM_REQ;
4171
4172         memset(&rqst, 0, sizeof(struct smb_rqst));
4173         rqst.rq_iov = &iov;
4174         rqst.rq_nvec = 1;
4175
4176         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4177         cifs_small_buf_release(iov.iov_base);
4178         if (rc) {
4179                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4180                 goto posix_qfsinf_exit;
4181         }
4182         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4183
4184         info = (FILE_SYSTEM_POSIX_INFO *)(
4185                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4186         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4187                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4188                                sizeof(FILE_SYSTEM_POSIX_INFO));
4189         if (!rc)
4190                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4191
4192 posix_qfsinf_exit:
4193         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4194         return rc;
4195 }
4196
4197 int
4198 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4199               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4200 {
4201         struct smb_rqst rqst;
4202         struct smb2_query_info_rsp *rsp = NULL;
4203         struct kvec iov;
4204         struct kvec rsp_iov;
4205         int rc = 0;
4206         int resp_buftype;
4207         struct cifs_ses *ses = tcon->ses;
4208         struct smb2_fs_full_size_info *info = NULL;
4209         int flags = 0;
4210
4211         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4212                                 sizeof(struct smb2_fs_full_size_info),
4213                                 persistent_fid, volatile_fid);
4214         if (rc)
4215                 return rc;
4216
4217         if (smb3_encryption_required(tcon))
4218                 flags |= CIFS_TRANSFORM_REQ;
4219
4220         memset(&rqst, 0, sizeof(struct smb_rqst));
4221         rqst.rq_iov = &iov;
4222         rqst.rq_nvec = 1;
4223
4224         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4225         cifs_small_buf_release(iov.iov_base);
4226         if (rc) {
4227                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4228                 goto qfsinf_exit;
4229         }
4230         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4231
4232         info = (struct smb2_fs_full_size_info *)(
4233                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4234         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4235                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4236                                sizeof(struct smb2_fs_full_size_info));
4237         if (!rc)
4238                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4239
4240 qfsinf_exit:
4241         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4242         return rc;
4243 }
4244
4245 int
4246 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4247               u64 persistent_fid, u64 volatile_fid, int level)
4248 {
4249         struct smb_rqst rqst;
4250         struct smb2_query_info_rsp *rsp = NULL;
4251         struct kvec iov;
4252         struct kvec rsp_iov;
4253         int rc = 0;
4254         int resp_buftype, max_len, min_len;
4255         struct cifs_ses *ses = tcon->ses;
4256         unsigned int rsp_len, offset;
4257         int flags = 0;
4258
4259         if (level == FS_DEVICE_INFORMATION) {
4260                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4261                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4262         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4263                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4264                 min_len = MIN_FS_ATTR_INFO_SIZE;
4265         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4266                 max_len = sizeof(struct smb3_fs_ss_info);
4267                 min_len = sizeof(struct smb3_fs_ss_info);
4268         } else if (level == FS_VOLUME_INFORMATION) {
4269                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4270                 min_len = sizeof(struct smb3_fs_vol_info);
4271         } else {
4272                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4273                 return -EINVAL;
4274         }
4275
4276         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4277                                 persistent_fid, volatile_fid);
4278         if (rc)
4279                 return rc;
4280
4281         if (smb3_encryption_required(tcon))
4282                 flags |= CIFS_TRANSFORM_REQ;
4283
4284         memset(&rqst, 0, sizeof(struct smb_rqst));
4285         rqst.rq_iov = &iov;
4286         rqst.rq_nvec = 1;
4287
4288         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4289         cifs_small_buf_release(iov.iov_base);
4290         if (rc) {
4291                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4292                 goto qfsattr_exit;
4293         }
4294         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4295
4296         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4297         offset = le16_to_cpu(rsp->OutputBufferOffset);
4298         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4299         if (rc)
4300                 goto qfsattr_exit;
4301
4302         if (level == FS_ATTRIBUTE_INFORMATION)
4303                 memcpy(&tcon->fsAttrInfo, offset
4304                         + (char *)rsp, min_t(unsigned int,
4305                         rsp_len, max_len));
4306         else if (level == FS_DEVICE_INFORMATION)
4307                 memcpy(&tcon->fsDevInfo, offset
4308                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4309         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4310                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4311                         (offset + (char *)rsp);
4312                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4313                 tcon->perf_sector_size =
4314                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4315         } else if (level == FS_VOLUME_INFORMATION) {
4316                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4317                         (offset + (char *)rsp);
4318                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4319                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4320         }
4321
4322 qfsattr_exit:
4323         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4324         return rc;
4325 }
4326
4327 int
4328 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4329            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4330            const __u32 num_lock, struct smb2_lock_element *buf)
4331 {
4332         struct smb_rqst rqst;
4333         int rc = 0;
4334         struct smb2_lock_req *req = NULL;
4335         struct kvec iov[2];
4336         struct kvec rsp_iov;
4337         int resp_buf_type;
4338         unsigned int count;
4339         int flags = CIFS_NO_RESP;
4340         unsigned int total_len;
4341
4342         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4343
4344         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4345         if (rc)
4346                 return rc;
4347
4348         if (smb3_encryption_required(tcon))
4349                 flags |= CIFS_TRANSFORM_REQ;
4350
4351         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4352         req->LockCount = cpu_to_le16(num_lock);
4353
4354         req->PersistentFileId = persist_fid;
4355         req->VolatileFileId = volatile_fid;
4356
4357         count = num_lock * sizeof(struct smb2_lock_element);
4358
4359         iov[0].iov_base = (char *)req;
4360         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4361         iov[1].iov_base = (char *)buf;
4362         iov[1].iov_len = count;
4363
4364         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4365
4366         memset(&rqst, 0, sizeof(struct smb_rqst));
4367         rqst.rq_iov = iov;
4368         rqst.rq_nvec = 2;
4369
4370         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4371                             &rsp_iov);
4372         cifs_small_buf_release(req);
4373         if (rc) {
4374                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4375                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4376                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4377                                     tcon->ses->Suid, rc);
4378         }
4379
4380         return rc;
4381 }
4382
4383 int
4384 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4385           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4386           const __u64 length, const __u64 offset, const __u32 lock_flags,
4387           const bool wait)
4388 {
4389         struct smb2_lock_element lock;
4390
4391         lock.Offset = cpu_to_le64(offset);
4392         lock.Length = cpu_to_le64(length);
4393         lock.Flags = cpu_to_le32(lock_flags);
4394         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4395                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4396
4397         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4398 }
4399
4400 int
4401 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4402                  __u8 *lease_key, const __le32 lease_state)
4403 {
4404         struct smb_rqst rqst;
4405         int rc;
4406         struct smb2_lease_ack *req = NULL;
4407         struct cifs_ses *ses = tcon->ses;
4408         int flags = CIFS_OBREAK_OP;
4409         unsigned int total_len;
4410         struct kvec iov[1];
4411         struct kvec rsp_iov;
4412         int resp_buf_type;
4413         __u64 *please_key_high;
4414         __u64 *please_key_low;
4415
4416         cifs_dbg(FYI, "SMB2_lease_break\n");
4417         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4418                              &total_len);
4419         if (rc)
4420                 return rc;
4421
4422         if (smb3_encryption_required(tcon))
4423                 flags |= CIFS_TRANSFORM_REQ;
4424
4425         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4426         req->StructureSize = cpu_to_le16(36);
4427         total_len += 12;
4428
4429         memcpy(req->LeaseKey, lease_key, 16);
4430         req->LeaseState = lease_state;
4431
4432         flags |= CIFS_NO_RESP;
4433
4434         iov[0].iov_base = (char *)req;
4435         iov[0].iov_len = total_len;
4436
4437         memset(&rqst, 0, sizeof(struct smb_rqst));
4438         rqst.rq_iov = iov;
4439         rqst.rq_nvec = 1;
4440
4441         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4442         cifs_small_buf_release(req);
4443
4444         please_key_low = (__u64 *)lease_key;
4445         please_key_high = (__u64 *)(lease_key+8);
4446         if (rc) {
4447                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4448                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4449                         ses->Suid, *please_key_low, *please_key_high, rc);
4450                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4451         } else
4452                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4453                         ses->Suid, *please_key_low, *please_key_high);
4454
4455         return rc;
4456 }