fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon)
 102 {
 103         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 104         shdr->StructureSize = cpu_to_le16(64);
 105         shdr->Command = smb2_cmd;
 106         if (tcon && tcon->ses && tcon->ses->server) {
 107                 struct TCP_Server_Info *server = tcon->ses->server;
 108
 109                 spin_lock(&server->req_lock);
 110                 /* Request up to 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[MAX_TREE_SIZE + 1];
 166         const char *tcp_host;
 167         size_t tcp_host_len;
 168         const char *dfs_host;
 169         size_t dfs_host_len;
 170
 171         if (tcon->ipc) {
 172                 snprintf(tree, sizeof(tree), "\\\\%s\\IPC$",
 173                          tcon->ses->server->hostname);
 174                 return SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 175         }
 176
 177         if (!tcon->dfs_path)
 178                 return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 179
 180         rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
 181         if (rc)
 182                 return rc;
 183
 184         extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
 185                              &tcp_host_len);
 186
 187         for (it = dfs_cache_get_tgt_iterator(&tl); it;
 188              it = dfs_cache_get_next_tgt(&tl, it)) {
 189                 const char *tgt = dfs_cache_get_tgt_name(it);
 190
 191                 extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);
 192
 193                 if (dfs_host_len != tcp_host_len
 194                     || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
 195                         cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
 196                                  __func__,
 197                                  (int)dfs_host_len, dfs_host,
 198                                  (int)tcp_host_len, tcp_host);
 199                         continue;
 200                 }
 201
 202                 snprintf(tree, sizeof(tree), "\\%s", tgt);
 203
 204                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 205                 if (!rc)
 206                         break;
 207                 if (rc == -EREMOTE)
 208                         break;
 209         }
 210
 211         if (!rc) {
 212                 if (it)
 213                         rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
 214                                                             it);
 215                 else
 216                         rc = -ENOENT;
 217         }
 218         dfs_cache_free_tgts(&tl);
 219         return rc;
 220 }
 221 #else
 222 static inline int __smb2_reconnect(const struct nls_table *nlsc,
 223                                    struct cifs_tcon *tcon)
 224 {
 225         return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 226 }
 227 #endif
 228
 229 static int
 230 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 231 {
 232         int rc;
 233         struct nls_table *nls_codepage;
 234         struct cifs_ses *ses;
 235         struct TCP_Server_Info *server;
 236         int retries;
 237
 238         /*
 239          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 240          * check for tcp and smb session status done differently
 241          * for those three - in the calling routine.
 242          */
 243         if (tcon == NULL)
 244                 return 0;
 245
 246         if (smb2_command == SMB2_TREE_CONNECT)
 247                 return 0;
 248
 249         if (tcon->tidStatus == CifsExiting) {
 250                 /*
 251                  * only tree disconnect, open, and write,
 252                  * (and ulogoff which does not have tcon)
 253                  * are allowed as we start force umount.
 254                  */
 255                 if ((smb2_command != SMB2_WRITE) &&
 256                    (smb2_command != SMB2_CREATE) &&
 257                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 258                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 259                                  smb2_command);
 260                         return -ENODEV;
 261                 }
 262         }
 263         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 264             (!tcon->ses->server))
 265                 return -EIO;
 266
 267         ses = tcon->ses;
 268         server = ses->server;
 269
 270         retries = server->nr_targets;
 271
 272         /*
 273          * Give demultiplex thread up to 10 seconds to each target available for
 274          * reconnect -- should be greater than cifs socket timeout which is 7
 275          * seconds.
 276          */
 277         while (server->tcpStatus == CifsNeedReconnect) {
 278                 /*
 279                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 280                  * here since they are implicitly done when session drops.
 281                  */
 282                 switch (smb2_command) {
 283                 /*
 284                  * BB Should we keep oplock break and add flush to exceptions?
 285                  */
 286                 case SMB2_TREE_DISCONNECT:
 287                 case SMB2_CANCEL:
 288                 case SMB2_CLOSE:
 289                 case SMB2_OPLOCK_BREAK:
 290                         return -EAGAIN;
 291                 }
 292
 293                 rc = wait_event_interruptible_timeout(server->response_q,
 294                                                       (server->tcpStatus != CifsNeedReconnect),
 295                                                       10 * HZ);
 296                 if (rc < 0) {
 297                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 298                                  " signal by the process\n", __func__);
 299                         return -ERESTARTSYS;
 300                 }
 301
 302                 /* are we still trying to reconnect? */
 303                 if (server->tcpStatus != CifsNeedReconnect)
 304                         break;
 305
 306                 if (--retries)
 307                         continue;
 308
 309                 /*
 310                  * on "soft" mounts we wait once. Hard mounts keep
 311                  * retrying until process is killed or server comes
 312                  * back on-line
 313                  */
 314                 if (!tcon->retry) {
 315                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 316                         return -EHOSTDOWN;
 317                 }
 318                 retries = server->nr_targets;
 319         }
 320
 321         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 322                 return 0;
 323
 324         nls_codepage = load_nls_default();
 325
 326         /*
 327          * need to prevent multiple threads trying to simultaneously reconnect
 328          * the same SMB session
 329          */
 330         mutex_lock(&tcon->ses->session_mutex);
 331
 332         /*
 333          * Recheck after acquire mutex. If another thread is negotiating
 334          * and the server never sends an answer the socket will be closed
 335          * and tcpStatus set to reconnect.
 336          */
 337         if (server->tcpStatus == CifsNeedReconnect) {
 338                 rc = -EHOSTDOWN;
 339                 mutex_unlock(&tcon->ses->session_mutex);
 340                 goto out;
 341         }
 342
 343         rc = cifs_negotiate_protocol(0, tcon->ses);
 344         if (!rc && tcon->ses->need_reconnect)
 345                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 346
 347         if (rc || !tcon->need_reconnect) {
 348                 mutex_unlock(&tcon->ses->session_mutex);
 349                 goto out;
 350         }
 351
 352         cifs_mark_open_files_invalid(tcon);
 353         if (tcon->use_persistent)
 354                 tcon->need_reopen_files = true;
 355
 356         rc = __smb2_reconnect(nls_codepage, tcon);
 357         mutex_unlock(&tcon->ses->session_mutex);
 358
 359         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 360         if (rc) {
 361                 /* If sess reconnected but tcon didn't, something strange ... */
 362                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 363                 goto out;
 364         }
 365
 366         if (smb2_command != SMB2_INTERNAL_CMD)
 367                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 368
 369         atomic_inc(&tconInfoReconnectCount);
 370 out:
 371         /*
 372          * Check if handle based operation so we know whether we can continue
 373          * or not without returning to caller to reset file handle.
 374          */
 375         /*
 376          * BB Is flush done by server on drop of tcp session? Should we special
 377          * case it and skip above?
 378          */
 379         switch (smb2_command) {
 380         case SMB2_FLUSH:
 381         case SMB2_READ:
 382         case SMB2_WRITE:
 383         case SMB2_LOCK:
 384         case SMB2_IOCTL:
 385         case SMB2_QUERY_DIRECTORY:
 386         case SMB2_CHANGE_NOTIFY:
 387         case SMB2_QUERY_INFO:
 388         case SMB2_SET_INFO:
 389                 rc = -EAGAIN;
 390         }
 391         unload_nls(nls_codepage);
 392         return rc;
 393 }
 394
 395 static void
 396 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 397                unsigned int *total_len)
 398 {
 399         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 400         /* lookup word count ie StructureSize from table */
 401         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 402
 403         /*
 404          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 405          * largest operations (Create)
 406          */
 407         memset(buf, 0, 256);
 408
 409         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 410         spdu->StructureSize2 = cpu_to_le16(parmsize);
 411
 412         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 413 }
 414
 415 /*
 416  * Allocate and return pointer to an SMB request hdr, and set basic
 417  * SMB information in the SMB header. If the return code is zero, this
 418  * function must have filled in request_buf pointer.
 419  */
 420 static int
 421 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 422                     void **request_buf, unsigned int *total_len)
 423 {
 424         int rc;
 425
 426         rc = smb2_reconnect(smb2_command, tcon);
 427         if (rc)
 428                 return rc;
 429
 430         /* BB eventually switch this to SMB2 specific small buf size */
 431         if (smb2_command == SMB2_SET_INFO)
 432                 *request_buf = cifs_buf_get();
 433         else
 434                 *request_buf = cifs_small_buf_get();
 435         if (*request_buf == NULL) {
 436                 /* BB should we add a retry in here if not a writepage? */
 437                 return -ENOMEM;
 438         }
 439
 440         fill_small_buf(smb2_command, tcon,
 441                        (struct smb2_sync_hdr *)(*request_buf),
 442                        total_len);
 443
 444         if (tcon != NULL) {
 445                 uint16_t com_code = le16_to_cpu(smb2_command);
 446                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 447                 cifs_stats_inc(&tcon->num_smbs_sent);
 448         }
 449
 450         return rc;
 451 }
 452
 453
 454 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 455 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 456 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 457
 458 static void
 459 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 460 {
 461         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 462         pneg_ctxt->DataLength = cpu_to_le16(38);
 463         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 464         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 465         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 466         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 467 }
 468
 469 static void
 470 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 471 {
 472         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 473         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 474         pneg_ctxt->CipherCount = cpu_to_le16(1);
 475 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 476         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 477 }
 478
 479 static void
 480 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 481 {
 482         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 483         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 484 }
 485
 486 static void
 487 assemble_neg_contexts(struct smb2_negotiate_req *req,
 488                       unsigned int *total_len)
 489 {
 490         char *pneg_ctxt = (char *)req;
 491         unsigned int ctxt_len;
 492
 493         if (*total_len > 200) {
 494                 /* In case length corrupted don't want to overrun smb buffer */
 495                 cifs_dbg(VFS, "Bad frame length assembling neg contexts\n");
 496                 return;
 497         }
 498
 499         /*
 500          * round up total_len of fixed part of SMB3 negotiate request to 8
 501          * byte boundary before adding negotiate contexts
 502          */
 503         *total_len = roundup(*total_len, 8);
 504
 505         pneg_ctxt = (*total_len) + (char *)req;
 506         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 507
 508         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 509         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 510         *total_len += ctxt_len;
 511         pneg_ctxt += ctxt_len;
 512
 513         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 514         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 515         *total_len += ctxt_len;
 516         pneg_ctxt += ctxt_len;
 517
 518         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 519         *total_len += sizeof(struct smb2_posix_neg_context);
 520
 521         req->NegotiateContextCount = cpu_to_le16(3);
 522 }
 523
 524 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 525 {
 526         unsigned int len = le16_to_cpu(ctxt->DataLength);
 527
 528         /* If invalid preauth context warn but use what we requested, SHA-512 */
 529         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 530                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 531                 return;
 532         }
 533         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 534                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 535         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 536                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 537 }
 538
 539 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 540                               struct smb2_encryption_neg_context *ctxt)
 541 {
 542         unsigned int len = le16_to_cpu(ctxt->DataLength);
 543
 544         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 545         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 546                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 547                 return -EINVAL;
 548         }
 549
 550         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 551                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 552                 return -EINVAL;
 553         }
 554         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 555         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 556             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 557                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 558                 return -EINVAL;
 559         }
 560         server->cipher_type = ctxt->Ciphers[0];
 561         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 562         return 0;
 563 }
 564
 565 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 566                                      struct TCP_Server_Info *server,
 567                                      unsigned int len_of_smb)
 568 {
 569         struct smb2_neg_context *pctx;
 570         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 571         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 572         unsigned int len_of_ctxts, i;
 573         int rc = 0;
 574
 575         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 576         if (len_of_smb <= offset) {
 577                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 578                 return -EINVAL;
 579         }
 580
 581         len_of_ctxts = len_of_smb - offset;
 582
 583         for (i = 0; i < ctxt_cnt; i++) {
 584                 int clen;
 585                 /* check that offset is not beyond end of SMB */
 586                 if (len_of_ctxts == 0)
 587                         break;
 588
 589                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 590                         break;
 591
 592                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 593                 clen = le16_to_cpu(pctx->DataLength);
 594                 if (clen > len_of_ctxts)
 595                         break;
 596
 597                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 598                         decode_preauth_context(
 599                                 (struct smb2_preauth_neg_context *)pctx);
 600                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 601                         rc = decode_encrypt_ctx(server,
 602                                 (struct smb2_encryption_neg_context *)pctx);
 603                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 604                         server->posix_ext_supported = true;
 605                 else
 606                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 607                                 le16_to_cpu(pctx->ContextType));
 608
 609                 if (rc)
 610                         break;
 611                 /* offsets must be 8 byte aligned */
 612                 clen = (clen + 7) & ~0x7;
 613                 offset += clen + sizeof(struct smb2_neg_context);
 614                 len_of_ctxts -= clen;
 615         }
 616         return rc;
 617 }
 618
 619 static struct create_posix *
 620 create_posix_buf(umode_t mode)
 621 {
 622         struct create_posix *buf;
 623
 624         buf = kzalloc(sizeof(struct create_posix),
 625                         GFP_KERNEL);
 626         if (!buf)
 627                 return NULL;
 628
 629         buf->ccontext.DataOffset =
 630                 cpu_to_le16(offsetof(struct create_posix, Mode));
 631         buf->ccontext.DataLength = cpu_to_le32(4);
 632         buf->ccontext.NameOffset =
 633                 cpu_to_le16(offsetof(struct create_posix, Name));
 634         buf->ccontext.NameLength = cpu_to_le16(16);
 635
 636         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 637         buf->Name[0] = 0x93;
 638         buf->Name[1] = 0xAD;
 639         buf->Name[2] = 0x25;
 640         buf->Name[3] = 0x50;
 641         buf->Name[4] = 0x9C;
 642         buf->Name[5] = 0xB4;
 643         buf->Name[6] = 0x11;
 644         buf->Name[7] = 0xE7;
 645         buf->Name[8] = 0xB4;
 646         buf->Name[9] = 0x23;
 647         buf->Name[10] = 0x83;
 648         buf->Name[11] = 0xDE;
 649         buf->Name[12] = 0x96;
 650         buf->Name[13] = 0x8B;
 651         buf->Name[14] = 0xCD;
 652         buf->Name[15] = 0x7C;
 653         buf->Mode = cpu_to_le32(mode);
 654         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 655         return buf;
 656 }
 657
 658 static int
 659 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 660 {
 661         struct smb2_create_req *req = iov[0].iov_base;
 662         unsigned int num = *num_iovec;
 663
 664         iov[num].iov_base = create_posix_buf(mode);
 665         if (iov[num].iov_base == NULL)
 666                 return -ENOMEM;
 667         iov[num].iov_len = sizeof(struct create_posix);
 668         if (!req->CreateContextsOffset)
 669                 req->CreateContextsOffset = cpu_to_le32(
 670                                 sizeof(struct smb2_create_req) +
 671                                 iov[num - 1].iov_len);
 672         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 673         *num_iovec = num + 1;
 674         return 0;
 675 }
 676
 677
 678 /*
 679  *
 680  *      SMB2 Worker functions follow:
 681  *
 682  *      The general structure of the worker functions is:
 683  *      1) Call smb2_init (assembles SMB2 header)
 684  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 685  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 686  *      4) Decode SMB2 command specific fields in the fixed length area
 687  *      5) Decode variable length data area (if any for this SMB2 command type)
 688  *      6) Call free smb buffer
 689  *      7) return
 690  *
 691  */
 692
 693 int
 694 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 695 {
 696         struct smb_rqst rqst;
 697         struct smb2_negotiate_req *req;
 698         struct smb2_negotiate_rsp *rsp;
 699         struct kvec iov[1];
 700         struct kvec rsp_iov;
 701         int rc = 0;
 702         int resp_buftype;
 703         struct TCP_Server_Info *server = ses->server;
 704         int blob_offset, blob_length;
 705         char *security_blob;
 706         int flags = CIFS_NEG_OP;
 707         unsigned int total_len;
 708
 709         cifs_dbg(FYI, "Negotiate protocol\n");
 710
 711         if (!server) {
 712                 WARN(1, "%s: server is NULL!\n", __func__);
 713                 return -EIO;
 714         }
 715
 716         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 717         if (rc)
 718                 return rc;
 719
 720         req->sync_hdr.SessionId = 0;
 721
 722         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 723         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 724
 725         if (strcmp(ses->server->vals->version_string,
 726                    SMB3ANY_VERSION_STRING) == 0) {
 727                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 728                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 729                 req->DialectCount = cpu_to_le16(2);
 730                 total_len += 4;
 731         } else if (strcmp(ses->server->vals->version_string,
 732                    SMBDEFAULT_VERSION_STRING) == 0) {
 733                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 734                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 735                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 736                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 737                 req->DialectCount = cpu_to_le16(4);
 738                 total_len += 8;
 739         } else {
 740                 /* otherwise send specific dialect */
 741                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 742                 req->DialectCount = cpu_to_le16(1);
 743                 total_len += 2;
 744         }
 745
 746         /* only one of SMB2 signing flags may be set in SMB2 request */
 747         if (ses->sign)
 748                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 749         else if (global_secflags & CIFSSEC_MAY_SIGN)
 750                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 751         else
 752                 req->SecurityMode = 0;
 753
 754         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 755
 756         /* ClientGUID must be zero for SMB2.02 dialect */
 757         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 758                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 759         else {
 760                 memcpy(req->ClientGUID, server->client_guid,
 761                         SMB2_CLIENT_GUID_SIZE);
 762                 if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
 763                     (strcmp(ses->server->vals->version_string,
 764                      SMBDEFAULT_VERSION_STRING) == 0))
 765                         assemble_neg_contexts(req, &total_len);
 766         }
 767         iov[0].iov_base = (char *)req;
 768         iov[0].iov_len = total_len;
 769
 770         memset(&rqst, 0, sizeof(struct smb_rqst));
 771         rqst.rq_iov = iov;
 772         rqst.rq_nvec = 1;
 773
 774         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 775         cifs_small_buf_release(req);
 776         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 777         /*
 778          * No tcon so can't do
 779          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 780          */
 781         if (rc == -EOPNOTSUPP) {
 782                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 783                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 784                         " older servers\n");
 785                 goto neg_exit;
 786         } else if (rc != 0)
 787                 goto neg_exit;
 788
 789         if (strcmp(ses->server->vals->version_string,
 790                    SMB3ANY_VERSION_STRING) == 0) {
 791                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 792                         cifs_dbg(VFS,
 793                                 "SMB2 dialect returned but not requested\n");
 794                         return -EIO;
 795                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 796                         cifs_dbg(VFS,
 797                                 "SMB2.1 dialect returned but not requested\n");
 798                         return -EIO;
 799                 }
 800         } else if (strcmp(ses->server->vals->version_string,
 801                    SMBDEFAULT_VERSION_STRING) == 0) {
 802                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 803                         cifs_dbg(VFS,
 804                                 "SMB2 dialect returned but not requested\n");
 805                         return -EIO;
 806                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 807                         /* ops set to 3.0 by default for default so update */
 808                         ses->server->ops = &smb21_operations;
 809                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 810                         ses->server->ops = &smb311_operations;
 811         } else if (le16_to_cpu(rsp->DialectRevision) !=
 812                                 ses->server->vals->protocol_id) {
 813                 /* if requested single dialect ensure returned dialect matched */
 814                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 815                         le16_to_cpu(rsp->DialectRevision));
 816                 return -EIO;
 817         }
 818
 819         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 820
 821         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 822                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 823         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 824                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 825         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 826                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 827         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 828                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 829         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 830                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 831         else {
 832                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 833                          le16_to_cpu(rsp->DialectRevision));
 834                 rc = -EIO;
 835                 goto neg_exit;
 836         }
 837         server->dialect = le16_to_cpu(rsp->DialectRevision);
 838
 839         /*
 840          * Keep a copy of the hash after negprot. This hash will be
 841          * the starting hash value for all sessions made from this
 842          * server.
 843          */
 844         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 845                SMB2_PREAUTH_HASH_SIZE);
 846
 847         /* SMB2 only has an extended negflavor */
 848         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 849         /* set it to the maximum buffer size value we can send with 1 credit */
 850         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 851                                SMB2_MAX_BUFFER_SIZE);
 852         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 853         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 854         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 855         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 856                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 857                                 server->sec_mode);
 858         server->capabilities = le32_to_cpu(rsp->Capabilities);
 859         /* Internal types */
 860         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 861
 862         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 863                                                (struct smb2_sync_hdr *)rsp);
 864         /*
 865          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 866          * for us will be
 867          *      ses->sectype = RawNTLMSSP;
 868          * but for time being this is our only auth choice so doesn't matter.
 869          * We just found a server which sets blob length to zero expecting raw.
 870          */
 871         if (blob_length == 0) {
 872                 cifs_dbg(FYI, "missing security blob on negprot\n");
 873                 server->sec_ntlmssp = true;
 874         }
 875
 876         rc = cifs_enable_signing(server, ses->sign);
 877         if (rc)
 878                 goto neg_exit;
 879         if (blob_length) {
 880                 rc = decode_negTokenInit(security_blob, blob_length, server);
 881                 if (rc == 1)
 882                         rc = 0;
 883                 else if (rc == 0)
 884                         rc = -EIO;
 885         }
 886
 887         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 888                 if (rsp->NegotiateContextCount)
 889                         rc = smb311_decode_neg_context(rsp, server,
 890                                                        rsp_iov.iov_len);
 891                 else
 892                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 893         }
 894 neg_exit:
 895         free_rsp_buf(resp_buftype, rsp);
 896         return rc;
 897 }
 898
 899 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 900 {
 901         int rc;
 902         struct validate_negotiate_info_req *pneg_inbuf;
 903         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 904         u32 rsplen;
 905         u32 inbuflen; /* max of 4 dialects */
 906
 907         cifs_dbg(FYI, "validate negotiate\n");
 908
 909         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 910         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 911                 return 0;
 912
 913         /*
 914          * validation ioctl must be signed, so no point sending this if we
 915          * can not sign it (ie are not known user).  Even if signing is not
 916          * required (enabled but not negotiated), in those cases we selectively
 917          * sign just this, the first and only signed request on a connection.
 918          * Having validation of negotiate info  helps reduce attack vectors.
 919          */
 920         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 921                 return 0; /* validation requires signing */
 922
 923         if (tcon->ses->user_name == NULL) {
 924                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 925                 return 0; /* validation requires signing */
 926         }
 927
 928         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 929                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 930
 931         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 932         if (!pneg_inbuf)
 933                 return -ENOMEM;
 934
 935         pneg_inbuf->Capabilities =
 936                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 937         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 938                                         SMB2_CLIENT_GUID_SIZE);
 939
 940         if (tcon->ses->sign)
 941                 pneg_inbuf->SecurityMode =
 942                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 943         else if (global_secflags & CIFSSEC_MAY_SIGN)
 944                 pneg_inbuf->SecurityMode =
 945                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 946         else
 947                 pneg_inbuf->SecurityMode = 0;
 948
 949
 950         if (strcmp(tcon->ses->server->vals->version_string,
 951                 SMB3ANY_VERSION_STRING) == 0) {
 952                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 953                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 954                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 955                 /* structure is big enough for 3 dialects, sending only 2 */
 956                 inbuflen = sizeof(*pneg_inbuf) -
 957                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
 958         } else if (strcmp(tcon->ses->server->vals->version_string,
 959                 SMBDEFAULT_VERSION_STRING) == 0) {
 960                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 961                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 962                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 963                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 964                 pneg_inbuf->DialectCount = cpu_to_le16(4);
 965                 /* structure is big enough for 3 dialects */
 966                 inbuflen = sizeof(*pneg_inbuf);
 967         } else {
 968                 /* otherwise specific dialect was requested */
 969                 pneg_inbuf->Dialects[0] =
 970                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 971                 pneg_inbuf->DialectCount = cpu_to_le16(1);
 972                 /* structure is big enough for 3 dialects, sending only 1 */
 973                 inbuflen = sizeof(*pneg_inbuf) -
 974                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
 975         }
 976
 977         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 978                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 979                 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
 980
 981         if (rc != 0) {
 982                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 983                 rc = -EIO;
 984                 goto out_free_inbuf;
 985         }
 986
 987         rc = -EIO;
 988         if (rsplen != sizeof(*pneg_rsp)) {
 989                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 990                          rsplen);
 991
 992                 /* relax check since Mac returns max bufsize allowed on ioctl */
 993                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
 994                         goto out_free_rsp;
 995         }
 996
 997         /* check validate negotiate info response matches what we got earlier */
 998         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
 999                 goto vneg_out;
1000
1001         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
1002                 goto vneg_out;
1003
1004         /* do not validate server guid because not saved at negprot time yet */
1005
1006         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1007               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
1008                 goto vneg_out;
1009
1010         /* validate negotiate successful */
1011         rc = 0;
1012         cifs_dbg(FYI, "validate negotiate info successful\n");
1013         goto out_free_rsp;
1014
1015 vneg_out:
1016         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1017 out_free_rsp:
1018         kfree(pneg_rsp);
1019 out_free_inbuf:
1020         kfree(pneg_inbuf);
1021         return rc;
1022 }
1023
1024 enum securityEnum
1025 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1026 {
1027         switch (requested) {
1028         case Kerberos:
1029         case RawNTLMSSP:
1030                 return requested;
1031         case NTLMv2:
1032                 return RawNTLMSSP;
1033         case Unspecified:
1034                 if (server->sec_ntlmssp &&
1035                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1036                         return RawNTLMSSP;
1037                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1038                         (global_secflags & CIFSSEC_MAY_KRB5))
1039                         return Kerberos;
1040                 /* Fallthrough */
1041         default:
1042                 return Unspecified;
1043         }
1044 }
1045
1046 struct SMB2_sess_data {
1047         unsigned int xid;
1048         struct cifs_ses *ses;
1049         struct nls_table *nls_cp;
1050         void (*func)(struct SMB2_sess_data *);
1051         int result;
1052         u64 previous_session;
1053
1054         /* we will send the SMB in three pieces:
1055          * a fixed length beginning part, an optional
1056          * SPNEGO blob (which can be zero length), and a
1057          * last part which will include the strings
1058          * and rest of bcc area. This allows us to avoid
1059          * a large buffer 17K allocation
1060          */
1061         int buf0_type;
1062         struct kvec iov[2];
1063 };
1064
1065 static int
1066 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1067 {
1068         int rc;
1069         struct cifs_ses *ses = sess_data->ses;
1070         struct smb2_sess_setup_req *req;
1071         struct TCP_Server_Info *server = ses->server;
1072         unsigned int total_len;
1073
1074         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1075                              &total_len);
1076         if (rc)
1077                 return rc;
1078
1079         /* First session, not a reauthenticate */
1080         req->sync_hdr.SessionId = 0;
1081
1082         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1083         req->PreviousSessionId = sess_data->previous_session;
1084
1085         req->Flags = 0; /* MBZ */
1086
1087         /* enough to enable echos and oplocks and one max size write */
1088         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1089
1090         /* only one of SMB2 signing flags may be set in SMB2 request */
1091         if (server->sign)
1092                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1093         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1094                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1095         else
1096                 req->SecurityMode = 0;
1097
1098         req->Capabilities = 0;
1099         req->Channel = 0; /* MBZ */
1100
1101         sess_data->iov[0].iov_base = (char *)req;
1102         /* 1 for pad */
1103         sess_data->iov[0].iov_len = total_len - 1;
1104         /*
1105          * This variable will be used to clear the buffer
1106          * allocated above in case of any error in the calling function.
1107          */
1108         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1109
1110         return 0;
1111 }
1112
1113 static void
1114 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1115 {
1116         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1117         sess_data->buf0_type = CIFS_NO_BUFFER;
1118 }
1119
1120 static int
1121 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1122 {
1123         int rc;
1124         struct smb_rqst rqst;
1125         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1126         struct kvec rsp_iov = { NULL, 0 };
1127
1128         /* Testing shows that buffer offset must be at location of Buffer[0] */
1129         req->SecurityBufferOffset =
1130                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1131         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1132
1133         memset(&rqst, 0, sizeof(struct smb_rqst));
1134         rqst.rq_iov = sess_data->iov;
1135         rqst.rq_nvec = 2;
1136
1137         /* BB add code to build os and lm fields */
1138         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1139                             &rqst,
1140                             &sess_data->buf0_type,
1141                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1142         cifs_small_buf_release(sess_data->iov[0].iov_base);
1143         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1144
1145         return rc;
1146 }
1147
1148 static int
1149 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1150 {
1151         int rc = 0;
1152         struct cifs_ses *ses = sess_data->ses;
1153
1154         mutex_lock(&ses->server->srv_mutex);
1155         if (ses->server->ops->generate_signingkey) {
1156                 rc = ses->server->ops->generate_signingkey(ses);
1157                 if (rc) {
1158                         cifs_dbg(FYI,
1159                                 "SMB3 session key generation failed\n");
1160                         mutex_unlock(&ses->server->srv_mutex);
1161                         return rc;
1162                 }
1163         }
1164         if (!ses->server->session_estab) {
1165                 ses->server->sequence_number = 0x2;
1166                 ses->server->session_estab = true;
1167         }
1168         mutex_unlock(&ses->server->srv_mutex);
1169
1170         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1171         spin_lock(&GlobalMid_Lock);
1172         ses->status = CifsGood;
1173         ses->need_reconnect = false;
1174         spin_unlock(&GlobalMid_Lock);
1175         return rc;
1176 }
1177
1178 #ifdef CONFIG_CIFS_UPCALL
1179 static void
1180 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1181 {
1182         int rc;
1183         struct cifs_ses *ses = sess_data->ses;
1184         struct cifs_spnego_msg *msg;
1185         struct key *spnego_key = NULL;
1186         struct smb2_sess_setup_rsp *rsp = NULL;
1187
1188         rc = SMB2_sess_alloc_buffer(sess_data);
1189         if (rc)
1190                 goto out;
1191
1192         spnego_key = cifs_get_spnego_key(ses);
1193         if (IS_ERR(spnego_key)) {
1194                 rc = PTR_ERR(spnego_key);
1195                 spnego_key = NULL;
1196                 goto out;
1197         }
1198
1199         msg = spnego_key->payload.data[0];
1200         /*
1201          * check version field to make sure that cifs.upcall is
1202          * sending us a response in an expected form
1203          */
1204         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1205                 cifs_dbg(VFS,
1206                           "bad cifs.upcall version. Expected %d got %d",
1207                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1208                 rc = -EKEYREJECTED;
1209                 goto out_put_spnego_key;
1210         }
1211
1212         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1213                                          GFP_KERNEL);
1214         if (!ses->auth_key.response) {
1215                 cifs_dbg(VFS,
1216                         "Kerberos can't allocate (%u bytes) memory",
1217                         msg->sesskey_len);
1218                 rc = -ENOMEM;
1219                 goto out_put_spnego_key;
1220         }
1221         ses->auth_key.len = msg->sesskey_len;
1222
1223         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1224         sess_data->iov[1].iov_len = msg->secblob_len;
1225
1226         rc = SMB2_sess_sendreceive(sess_data);
1227         if (rc)
1228                 goto out_put_spnego_key;
1229
1230         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1231         ses->Suid = rsp->sync_hdr.SessionId;
1232
1233         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1234
1235         rc = SMB2_sess_establish_session(sess_data);
1236 out_put_spnego_key:
1237         key_invalidate(spnego_key);
1238         key_put(spnego_key);
1239 out:
1240         sess_data->result = rc;
1241         sess_data->func = NULL;
1242         SMB2_sess_free_buffer(sess_data);
1243 }
1244 #else
1245 static void
1246 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1247 {
1248         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1249         sess_data->result = -EOPNOTSUPP;
1250         sess_data->func = NULL;
1251 }
1252 #endif
1253
1254 static void
1255 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1256
1257 static void
1258 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1259 {
1260         int rc;
1261         struct cifs_ses *ses = sess_data->ses;
1262         struct smb2_sess_setup_rsp *rsp = NULL;
1263         char *ntlmssp_blob = NULL;
1264         bool use_spnego = false; /* else use raw ntlmssp */
1265         u16 blob_length = 0;
1266
1267         /*
1268          * If memory allocation is successful, caller of this function
1269          * frees it.
1270          */
1271         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1272         if (!ses->ntlmssp) {
1273                 rc = -ENOMEM;
1274                 goto out_err;
1275         }
1276         ses->ntlmssp->sesskey_per_smbsess = true;
1277
1278         rc = SMB2_sess_alloc_buffer(sess_data);
1279         if (rc)
1280                 goto out_err;
1281
1282         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1283                                GFP_KERNEL);
1284         if (ntlmssp_blob == NULL) {
1285                 rc = -ENOMEM;
1286                 goto out;
1287         }
1288
1289         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1290         if (use_spnego) {
1291                 /* BB eventually need to add this */
1292                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1293                 rc = -EOPNOTSUPP;
1294                 goto out;
1295         } else {
1296                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1297                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1298         }
1299         sess_data->iov[1].iov_base = ntlmssp_blob;
1300         sess_data->iov[1].iov_len = blob_length;
1301
1302         rc = SMB2_sess_sendreceive(sess_data);
1303         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1304
1305         /* If true, rc here is expected and not an error */
1306         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1307                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1308                 rc = 0;
1309
1310         if (rc)
1311                 goto out;
1312
1313         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1314                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1315                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1316                         le16_to_cpu(rsp->SecurityBufferOffset));
1317                 rc = -EIO;
1318                 goto out;
1319         }
1320         rc = decode_ntlmssp_challenge(rsp->Buffer,
1321                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1322         if (rc)
1323                 goto out;
1324
1325         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1326
1327
1328         ses->Suid = rsp->sync_hdr.SessionId;
1329         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1330
1331 out:
1332         kfree(ntlmssp_blob);
1333         SMB2_sess_free_buffer(sess_data);
1334         if (!rc) {
1335                 sess_data->result = 0;
1336                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1337                 return;
1338         }
1339 out_err:
1340         kfree(ses->ntlmssp);
1341         ses->ntlmssp = NULL;
1342         sess_data->result = rc;
1343         sess_data->func = NULL;
1344 }
1345
1346 static void
1347 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1348 {
1349         int rc;
1350         struct cifs_ses *ses = sess_data->ses;
1351         struct smb2_sess_setup_req *req;
1352         struct smb2_sess_setup_rsp *rsp = NULL;
1353         unsigned char *ntlmssp_blob = NULL;
1354         bool use_spnego = false; /* else use raw ntlmssp */
1355         u16 blob_length = 0;
1356
1357         rc = SMB2_sess_alloc_buffer(sess_data);
1358         if (rc)
1359                 goto out;
1360
1361         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1362         req->sync_hdr.SessionId = ses->Suid;
1363
1364         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1365                                         sess_data->nls_cp);
1366         if (rc) {
1367                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1368                 goto out;
1369         }
1370
1371         if (use_spnego) {
1372                 /* BB eventually need to add this */
1373                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1374                 rc = -EOPNOTSUPP;
1375                 goto out;
1376         }
1377         sess_data->iov[1].iov_base = ntlmssp_blob;
1378         sess_data->iov[1].iov_len = blob_length;
1379
1380         rc = SMB2_sess_sendreceive(sess_data);
1381         if (rc)
1382                 goto out;
1383
1384         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1385
1386         ses->Suid = rsp->sync_hdr.SessionId;
1387         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1388
1389         rc = SMB2_sess_establish_session(sess_data);
1390 out:
1391         kfree(ntlmssp_blob);
1392         SMB2_sess_free_buffer(sess_data);
1393         kfree(ses->ntlmssp);
1394         ses->ntlmssp = NULL;
1395         sess_data->result = rc;
1396         sess_data->func = NULL;
1397 }
1398
1399 static int
1400 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1401 {
1402         int type;
1403
1404         type = smb2_select_sectype(ses->server, ses->sectype);
1405         cifs_dbg(FYI, "sess setup type %d\n", type);
1406         if (type == Unspecified) {
1407                 cifs_dbg(VFS,
1408                         "Unable to select appropriate authentication method!");
1409                 return -EINVAL;
1410         }
1411
1412         switch (type) {
1413         case Kerberos:
1414                 sess_data->func = SMB2_auth_kerberos;
1415                 break;
1416         case RawNTLMSSP:
1417                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1418                 break;
1419         default:
1420                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1421                 return -EOPNOTSUPP;
1422         }
1423
1424         return 0;
1425 }
1426
1427 int
1428 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1429                 const struct nls_table *nls_cp)
1430 {
1431         int rc = 0;
1432         struct TCP_Server_Info *server = ses->server;
1433         struct SMB2_sess_data *sess_data;
1434
1435         cifs_dbg(FYI, "Session Setup\n");
1436
1437         if (!server) {
1438                 WARN(1, "%s: server is NULL!\n", __func__);
1439                 return -EIO;
1440         }
1441
1442         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1443         if (!sess_data)
1444                 return -ENOMEM;
1445
1446         rc = SMB2_select_sec(ses, sess_data);
1447         if (rc)
1448                 goto out;
1449         sess_data->xid = xid;
1450         sess_data->ses = ses;
1451         sess_data->buf0_type = CIFS_NO_BUFFER;
1452         sess_data->nls_cp = (struct nls_table *) nls_cp;
1453         sess_data->previous_session = ses->Suid;
1454
1455         /*
1456          * Initialize the session hash with the server one.
1457          */
1458         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1459                SMB2_PREAUTH_HASH_SIZE);
1460
1461         while (sess_data->func)
1462                 sess_data->func(sess_data);
1463
1464         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1465                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1466         rc = sess_data->result;
1467 out:
1468         kfree(sess_data);
1469         return rc;
1470 }
1471
1472 int
1473 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1474 {
1475         struct smb_rqst rqst;
1476         struct smb2_logoff_req *req; /* response is also trivial struct */
1477         int rc = 0;
1478         struct TCP_Server_Info *server;
1479         int flags = 0;
1480         unsigned int total_len;
1481         struct kvec iov[1];
1482         struct kvec rsp_iov;
1483         int resp_buf_type;
1484
1485         cifs_dbg(FYI, "disconnect session %p\n", ses);
1486
1487         if (ses && (ses->server))
1488                 server = ses->server;
1489         else
1490                 return -EIO;
1491
1492         /* no need to send SMB logoff if uid already closed due to reconnect */
1493         if (ses->need_reconnect)
1494                 goto smb2_session_already_dead;
1495
1496         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1497         if (rc)
1498                 return rc;
1499
1500          /* since no tcon, smb2_init can not do this, so do here */
1501         req->sync_hdr.SessionId = ses->Suid;
1502
1503         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1504                 flags |= CIFS_TRANSFORM_REQ;
1505         else if (server->sign)
1506                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1507
1508         flags |= CIFS_NO_RESP;
1509
1510         iov[0].iov_base = (char *)req;
1511         iov[0].iov_len = total_len;
1512
1513         memset(&rqst, 0, sizeof(struct smb_rqst));
1514         rqst.rq_iov = iov;
1515         rqst.rq_nvec = 1;
1516
1517         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1518         cifs_small_buf_release(req);
1519         /*
1520          * No tcon so can't do
1521          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1522          */
1523
1524 smb2_session_already_dead:
1525         return rc;
1526 }
1527
1528 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1529 {
1530         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1531 }
1532
1533 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1534
1535 /* These are similar values to what Windows uses */
1536 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1537 {
1538         tcon->max_chunks = 256;
1539         tcon->max_bytes_chunk = 1048576;
1540         tcon->max_bytes_copy = 16777216;
1541 }
1542
1543 int
1544 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1545           struct cifs_tcon *tcon, const struct nls_table *cp)
1546 {
1547         struct smb_rqst rqst;
1548         struct smb2_tree_connect_req *req;
1549         struct smb2_tree_connect_rsp *rsp = NULL;
1550         struct kvec iov[2];
1551         struct kvec rsp_iov = { NULL, 0 };
1552         int rc = 0;
1553         int resp_buftype;
1554         int unc_path_len;
1555         __le16 *unc_path = NULL;
1556         int flags = 0;
1557         unsigned int total_len;
1558
1559         cifs_dbg(FYI, "TCON\n");
1560
1561         if (!(ses->server) || !tree)
1562                 return -EIO;
1563
1564         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1565         if (unc_path == NULL)
1566                 return -ENOMEM;
1567
1568         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1569         unc_path_len *= 2;
1570         if (unc_path_len < 2) {
1571                 kfree(unc_path);
1572                 return -EINVAL;
1573         }
1574
1575         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1576         tcon->tid = 0;
1577         atomic_set(&tcon->num_remote_opens, 0);
1578         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1579                              &total_len);
1580         if (rc) {
1581                 kfree(unc_path);
1582                 return rc;
1583         }
1584
1585         if (smb3_encryption_required(tcon))
1586                 flags |= CIFS_TRANSFORM_REQ;
1587
1588         iov[0].iov_base = (char *)req;
1589         /* 1 for pad */
1590         iov[0].iov_len = total_len - 1;
1591
1592         /* Testing shows that buffer offset must be at location of Buffer[0] */
1593         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1594                         - 1 /* pad */);
1595         req->PathLength = cpu_to_le16(unc_path_len - 2);
1596         iov[1].iov_base = unc_path;
1597         iov[1].iov_len = unc_path_len;
1598
1599         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1600         if ((ses->server->dialect == SMB311_PROT_ID) &&
1601             !smb3_encryption_required(tcon))
1602                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1603
1604         memset(&rqst, 0, sizeof(struct smb_rqst));
1605         rqst.rq_iov = iov;
1606         rqst.rq_nvec = 2;
1607
1608         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1609         cifs_small_buf_release(req);
1610         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1611         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1612         if (rc != 0) {
1613                 if (tcon) {
1614                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1615                         tcon->need_reconnect = true;
1616                 }
1617                 goto tcon_error_exit;
1618         }
1619
1620         switch (rsp->ShareType) {
1621         case SMB2_SHARE_TYPE_DISK:
1622                 cifs_dbg(FYI, "connection to disk share\n");
1623                 break;
1624         case SMB2_SHARE_TYPE_PIPE:
1625                 tcon->pipe = true;
1626                 cifs_dbg(FYI, "connection to pipe share\n");
1627                 break;
1628         case SMB2_SHARE_TYPE_PRINT:
1629                 tcon->print = true;
1630                 cifs_dbg(FYI, "connection to printer\n");
1631                 break;
1632         default:
1633                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1634                 rc = -EOPNOTSUPP;
1635                 goto tcon_error_exit;
1636         }
1637
1638         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1639         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1640         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1641         tcon->tidStatus = CifsGood;
1642         tcon->need_reconnect = false;
1643         tcon->tid = rsp->sync_hdr.TreeId;
1644         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1645
1646         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1647             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1648                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1649
1650         if (tcon->seal &&
1651             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1652                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1653
1654         init_copy_chunk_defaults(tcon);
1655         if (tcon->ses->server->ops->validate_negotiate)
1656                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1657 tcon_exit:
1658
1659         free_rsp_buf(resp_buftype, rsp);
1660         kfree(unc_path);
1661         return rc;
1662
1663 tcon_error_exit:
1664         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1665                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1666         }
1667         goto tcon_exit;
1668 }
1669
1670 int
1671 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1672 {
1673         struct smb_rqst rqst;
1674         struct smb2_tree_disconnect_req *req; /* response is trivial */
1675         int rc = 0;
1676         struct cifs_ses *ses = tcon->ses;
1677         int flags = 0;
1678         unsigned int total_len;
1679         struct kvec iov[1];
1680         struct kvec rsp_iov;
1681         int resp_buf_type;
1682
1683         cifs_dbg(FYI, "Tree Disconnect\n");
1684
1685         if (!ses || !(ses->server))
1686                 return -EIO;
1687
1688         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1689                 return 0;
1690
1691         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1692                              &total_len);
1693         if (rc)
1694                 return rc;
1695
1696         if (smb3_encryption_required(tcon))
1697                 flags |= CIFS_TRANSFORM_REQ;
1698
1699         flags |= CIFS_NO_RESP;
1700
1701         iov[0].iov_base = (char *)req;
1702         iov[0].iov_len = total_len;
1703
1704         memset(&rqst, 0, sizeof(struct smb_rqst));
1705         rqst.rq_iov = iov;
1706         rqst.rq_nvec = 1;
1707
1708         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1709         cifs_small_buf_release(req);
1710         if (rc)
1711                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1712
1713         return rc;
1714 }
1715
1716
1717 static struct create_durable *
1718 create_durable_buf(void)
1719 {
1720         struct create_durable *buf;
1721
1722         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1723         if (!buf)
1724                 return NULL;
1725
1726         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1727                                         (struct create_durable, Data));
1728         buf->ccontext.DataLength = cpu_to_le32(16);
1729         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1730                                 (struct create_durable, Name));
1731         buf->ccontext.NameLength = cpu_to_le16(4);
1732         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1733         buf->Name[0] = 'D';
1734         buf->Name[1] = 'H';
1735         buf->Name[2] = 'n';
1736         buf->Name[3] = 'Q';
1737         return buf;
1738 }
1739
1740 static struct create_durable *
1741 create_reconnect_durable_buf(struct cifs_fid *fid)
1742 {
1743         struct create_durable *buf;
1744
1745         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1746         if (!buf)
1747                 return NULL;
1748
1749         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1750                                         (struct create_durable, Data));
1751         buf->ccontext.DataLength = cpu_to_le32(16);
1752         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1753                                 (struct create_durable, Name));
1754         buf->ccontext.NameLength = cpu_to_le16(4);
1755         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1756         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1757         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1758         buf->Name[0] = 'D';
1759         buf->Name[1] = 'H';
1760         buf->Name[2] = 'n';
1761         buf->Name[3] = 'C';
1762         return buf;
1763 }
1764
1765 static __u8
1766 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1767                   unsigned int *epoch, char *lease_key)
1768 {
1769         char *data_offset;
1770         struct create_context *cc;
1771         unsigned int next;
1772         unsigned int remaining;
1773         char *name;
1774
1775         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1776         remaining = le32_to_cpu(rsp->CreateContextsLength);
1777         cc = (struct create_context *)data_offset;
1778         while (remaining >= sizeof(struct create_context)) {
1779                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1780                 if (le16_to_cpu(cc->NameLength) == 4 &&
1781                     strncmp(name, "RqLs", 4) == 0)
1782                         return server->ops->parse_lease_buf(cc, epoch,
1783                                                             lease_key);
1784
1785                 next = le32_to_cpu(cc->Next);
1786                 if (!next)
1787                         break;
1788                 remaining -= next;
1789                 cc = (struct create_context *)((char *)cc + next);
1790         }
1791
1792         return 0;
1793 }
1794
1795 static int
1796 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1797                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1798 {
1799         struct smb2_create_req *req = iov[0].iov_base;
1800         unsigned int num = *num_iovec;
1801
1802         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1803         if (iov[num].iov_base == NULL)
1804                 return -ENOMEM;
1805         iov[num].iov_len = server->vals->create_lease_size;
1806         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1807         if (!req->CreateContextsOffset)
1808                 req->CreateContextsOffset = cpu_to_le32(
1809                                 sizeof(struct smb2_create_req) +
1810                                 iov[num - 1].iov_len);
1811         le32_add_cpu(&req->CreateContextsLength,
1812                      server->vals->create_lease_size);
1813         *num_iovec = num + 1;
1814         return 0;
1815 }
1816
1817 static struct create_durable_v2 *
1818 create_durable_v2_buf(struct cifs_fid *pfid)
1819 {
1820         struct create_durable_v2 *buf;
1821
1822         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1823         if (!buf)
1824                 return NULL;
1825
1826         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1827                                         (struct create_durable_v2, dcontext));
1828         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1829         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1830                                 (struct create_durable_v2, Name));
1831         buf->ccontext.NameLength = cpu_to_le16(4);
1832
1833         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1834         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1835         generate_random_uuid(buf->dcontext.CreateGuid);
1836         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1837
1838         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1839         buf->Name[0] = 'D';
1840         buf->Name[1] = 'H';
1841         buf->Name[2] = '2';
1842         buf->Name[3] = 'Q';
1843         return buf;
1844 }
1845
1846 static struct create_durable_handle_reconnect_v2 *
1847 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1848 {
1849         struct create_durable_handle_reconnect_v2 *buf;
1850
1851         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1852                         GFP_KERNEL);
1853         if (!buf)
1854                 return NULL;
1855
1856         buf->ccontext.DataOffset =
1857                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1858                                      dcontext));
1859         buf->ccontext.DataLength =
1860                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1861         buf->ccontext.NameOffset =
1862                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1863                             Name));
1864         buf->ccontext.NameLength = cpu_to_le16(4);
1865
1866         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1867         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1868         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1869         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1870
1871         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1872         buf->Name[0] = 'D';
1873         buf->Name[1] = 'H';
1874         buf->Name[2] = '2';
1875         buf->Name[3] = 'C';
1876         return buf;
1877 }
1878
1879 static int
1880 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1881                     struct cifs_open_parms *oparms)
1882 {
1883         struct smb2_create_req *req = iov[0].iov_base;
1884         unsigned int num = *num_iovec;
1885
1886         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1887         if (iov[num].iov_base == NULL)
1888                 return -ENOMEM;
1889         iov[num].iov_len = sizeof(struct create_durable_v2);
1890         if (!req->CreateContextsOffset)
1891                 req->CreateContextsOffset =
1892                         cpu_to_le32(sizeof(struct smb2_create_req) +
1893                                                                 iov[1].iov_len);
1894         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1895         *num_iovec = num + 1;
1896         return 0;
1897 }
1898
1899 static int
1900 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1901                     struct cifs_open_parms *oparms)
1902 {
1903         struct smb2_create_req *req = iov[0].iov_base;
1904         unsigned int num = *num_iovec;
1905
1906         /* indicate that we don't need to relock the file */
1907         oparms->reconnect = false;
1908
1909         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1910         if (iov[num].iov_base == NULL)
1911                 return -ENOMEM;
1912         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1913         if (!req->CreateContextsOffset)
1914                 req->CreateContextsOffset =
1915                         cpu_to_le32(sizeof(struct smb2_create_req) +
1916                                                                 iov[1].iov_len);
1917         le32_add_cpu(&req->CreateContextsLength,
1918                         sizeof(struct create_durable_handle_reconnect_v2));
1919         *num_iovec = num + 1;
1920         return 0;
1921 }
1922
1923 static int
1924 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1925                     struct cifs_open_parms *oparms, bool use_persistent)
1926 {
1927         struct smb2_create_req *req = iov[0].iov_base;
1928         unsigned int num = *num_iovec;
1929
1930         if (use_persistent) {
1931                 if (oparms->reconnect)
1932                         return add_durable_reconnect_v2_context(iov, num_iovec,
1933                                                                 oparms);
1934                 else
1935                         return add_durable_v2_context(iov, num_iovec, oparms);
1936         }
1937
1938         if (oparms->reconnect) {
1939                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1940                 /* indicate that we don't need to relock the file */
1941                 oparms->reconnect = false;
1942         } else
1943                 iov[num].iov_base = create_durable_buf();
1944         if (iov[num].iov_base == NULL)
1945                 return -ENOMEM;
1946         iov[num].iov_len = sizeof(struct create_durable);
1947         if (!req->CreateContextsOffset)
1948                 req->CreateContextsOffset =
1949                         cpu_to_le32(sizeof(struct smb2_create_req) +
1950                                                                 iov[1].iov_len);
1951         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1952         *num_iovec = num + 1;
1953         return 0;
1954 }
1955
1956 /* See MS-SMB2 2.2.13.2.7 */
1957 static struct crt_twarp_ctxt *
1958 create_twarp_buf(__u64 timewarp)
1959 {
1960         struct crt_twarp_ctxt *buf;
1961
1962         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
1963         if (!buf)
1964                 return NULL;
1965
1966         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1967                                         (struct crt_twarp_ctxt, Timestamp));
1968         buf->ccontext.DataLength = cpu_to_le32(8);
1969         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1970                                 (struct crt_twarp_ctxt, Name));
1971         buf->ccontext.NameLength = cpu_to_le16(4);
1972         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
1973         buf->Name[0] = 'T';
1974         buf->Name[1] = 'W';
1975         buf->Name[2] = 'r';
1976         buf->Name[3] = 'p';
1977         buf->Timestamp = cpu_to_le64(timewarp);
1978         return buf;
1979 }
1980
1981 /* See MS-SMB2 2.2.13.2.7 */
1982 static int
1983 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
1984 {
1985         struct smb2_create_req *req = iov[0].iov_base;
1986         unsigned int num = *num_iovec;
1987
1988         iov[num].iov_base = create_twarp_buf(timewarp);
1989         if (iov[num].iov_base == NULL)
1990                 return -ENOMEM;
1991         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
1992         if (!req->CreateContextsOffset)
1993                 req->CreateContextsOffset = cpu_to_le32(
1994                                 sizeof(struct smb2_create_req) +
1995                                 iov[num - 1].iov_len);
1996         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
1997         *num_iovec = num + 1;
1998         return 0;
1999 }
2000
2001 static int
2002 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2003                             const char *treename, const __le16 *path)
2004 {
2005         int treename_len, path_len;
2006         struct nls_table *cp;
2007         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2008
2009         /*
2010          * skip leading "\\"
2011          */
2012         treename_len = strlen(treename);
2013         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2014                 return -EINVAL;
2015
2016         treename += 2;
2017         treename_len -= 2;
2018
2019         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2020
2021         /*
2022          * make room for one path separator between the treename and
2023          * path
2024          */
2025         *out_len = treename_len + 1 + path_len;
2026
2027         /*
2028          * final path needs to be null-terminated UTF16 with a
2029          * size aligned to 8
2030          */
2031
2032         *out_size = roundup((*out_len+1)*2, 8);
2033         *out_path = kzalloc(*out_size, GFP_KERNEL);
2034         if (!*out_path)
2035                 return -ENOMEM;
2036
2037         cp = load_nls_default();
2038         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2039         UniStrcat(*out_path, sep);
2040         UniStrcat(*out_path, path);
2041         unload_nls(cp);
2042
2043         return 0;
2044 }
2045
2046 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2047                                umode_t mode, struct cifs_tcon *tcon,
2048                                const char *full_path,
2049                                struct cifs_sb_info *cifs_sb)
2050 {
2051         struct smb_rqst rqst;
2052         struct smb2_create_req *req;
2053         struct smb2_create_rsp *rsp = NULL;
2054         struct cifs_ses *ses = tcon->ses;
2055         struct kvec iov[3]; /* make sure at least one for each open context */
2056         struct kvec rsp_iov = {NULL, 0};
2057         int resp_buftype;
2058         int uni_path_len;
2059         __le16 *copy_path = NULL;
2060         int copy_size;
2061         int rc = 0;
2062         unsigned int n_iov = 2;
2063         __u32 file_attributes = 0;
2064         char *pc_buf = NULL;
2065         int flags = 0;
2066         unsigned int total_len;
2067         __le16 *utf16_path = NULL;
2068
2069         cifs_dbg(FYI, "mkdir\n");
2070
2071         /* resource #1: path allocation */
2072         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2073         if (!utf16_path)
2074                 return -ENOMEM;
2075
2076         if (!ses || !(ses->server)) {
2077                 rc = -EIO;
2078                 goto err_free_path;
2079         }
2080
2081         /* resource #2: request */
2082         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2083         if (rc)
2084                 goto err_free_path;
2085
2086
2087         if (smb3_encryption_required(tcon))
2088                 flags |= CIFS_TRANSFORM_REQ;
2089
2090         req->ImpersonationLevel = IL_IMPERSONATION;
2091         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2092         /* File attributes ignored on open (used in create though) */
2093         req->FileAttributes = cpu_to_le32(file_attributes);
2094         req->ShareAccess = FILE_SHARE_ALL_LE;
2095         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2096         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2097
2098         iov[0].iov_base = (char *)req;
2099         /* -1 since last byte is buf[0] which is sent below (path) */
2100         iov[0].iov_len = total_len - 1;
2101
2102         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2103
2104         /* [MS-SMB2] 2.2.13 NameOffset:
2105          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2106          * the SMB2 header, the file name includes a prefix that will
2107          * be processed during DFS name normalization as specified in
2108          * section 3.3.5.9. Otherwise, the file name is relative to
2109          * the share that is identified by the TreeId in the SMB2
2110          * header.
2111          */
2112         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2113                 int name_len;
2114
2115                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2116                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2117                                                  &name_len,
2118                                                  tcon->treeName, utf16_path);
2119                 if (rc)
2120                         goto err_free_req;
2121
2122                 req->NameLength = cpu_to_le16(name_len * 2);
2123                 uni_path_len = copy_size;
2124                 /* free before overwriting resource */
2125                 kfree(utf16_path);
2126                 utf16_path = copy_path;
2127         } else {
2128                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2129                 /* MUST set path len (NameLength) to 0 opening root of share */
2130                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2131                 if (uni_path_len % 8 != 0) {
2132                         copy_size = roundup(uni_path_len, 8);
2133                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2134                         if (!copy_path) {
2135                                 rc = -ENOMEM;
2136                                 goto err_free_req;
2137                         }
2138                         memcpy((char *)copy_path, (const char *)utf16_path,
2139                                uni_path_len);
2140                         uni_path_len = copy_size;
2141                         /* free before overwriting resource */
2142                         kfree(utf16_path);
2143                         utf16_path = copy_path;
2144                 }
2145         }
2146
2147         iov[1].iov_len = uni_path_len;
2148         iov[1].iov_base = utf16_path;
2149         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2150
2151         if (tcon->posix_extensions) {
2152                 /* resource #3: posix buf */
2153                 rc = add_posix_context(iov, &n_iov, mode);
2154                 if (rc)
2155                         goto err_free_req;
2156                 pc_buf = iov[n_iov-1].iov_base;
2157         }
2158
2159
2160         memset(&rqst, 0, sizeof(struct smb_rqst));
2161         rqst.rq_iov = iov;
2162         rqst.rq_nvec = n_iov;
2163
2164         /* resource #4: response buffer */
2165         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2166         if (rc) {
2167                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2168                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2169                                            CREATE_NOT_FILE,
2170                                            FILE_WRITE_ATTRIBUTES, rc);
2171                 goto err_free_rsp_buf;
2172         }
2173
2174         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2175         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2176                                     ses->Suid, CREATE_NOT_FILE,
2177                                     FILE_WRITE_ATTRIBUTES);
2178
2179         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2180
2181         /* Eventually save off posix specific response info and timestaps */
2182
2183 err_free_rsp_buf:
2184         free_rsp_buf(resp_buftype, rsp);
2185         kfree(pc_buf);
2186 err_free_req:
2187         cifs_small_buf_release(req);
2188 err_free_path:
2189         kfree(utf16_path);
2190         return rc;
2191 }
2192
2193 int
2194 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2195                struct cifs_open_parms *oparms, __le16 *path)
2196 {
2197         struct TCP_Server_Info *server = tcon->ses->server;
2198         struct smb2_create_req *req;
2199         unsigned int n_iov = 2;
2200         __u32 file_attributes = 0;
2201         int copy_size;
2202         int uni_path_len;
2203         unsigned int total_len;
2204         struct kvec *iov = rqst->rq_iov;
2205         __le16 *copy_path;
2206         int rc;
2207
2208         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2209         if (rc)
2210                 return rc;
2211
2212         iov[0].iov_base = (char *)req;
2213         /* -1 since last byte is buf[0] which is sent below (path) */
2214         iov[0].iov_len = total_len - 1;
2215
2216         if (oparms->create_options & CREATE_OPTION_READONLY)
2217                 file_attributes |= ATTR_READONLY;
2218         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2219                 file_attributes |= ATTR_SYSTEM;
2220
2221         req->ImpersonationLevel = IL_IMPERSONATION;
2222         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2223         /* File attributes ignored on open (used in create though) */
2224         req->FileAttributes = cpu_to_le32(file_attributes);
2225         req->ShareAccess = FILE_SHARE_ALL_LE;
2226         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2227         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2228         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2229
2230         /* [MS-SMB2] 2.2.13 NameOffset:
2231          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2232          * the SMB2 header, the file name includes a prefix that will
2233          * be processed during DFS name normalization as specified in
2234          * section 3.3.5.9. Otherwise, the file name is relative to
2235          * the share that is identified by the TreeId in the SMB2
2236          * header.
2237          */
2238         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2239                 int name_len;
2240
2241                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2242                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2243                                                  &name_len,
2244                                                  tcon->treeName, path);
2245                 if (rc)
2246                         return rc;
2247                 req->NameLength = cpu_to_le16(name_len * 2);
2248                 uni_path_len = copy_size;
2249                 path = copy_path;
2250         } else {
2251                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2252                 /* MUST set path len (NameLength) to 0 opening root of share */
2253                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2254                 copy_size = uni_path_len;
2255                 if (copy_size % 8 != 0)
2256                         copy_size = roundup(copy_size, 8);
2257                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2258                 if (!copy_path)
2259                         return -ENOMEM;
2260                 memcpy((char *)copy_path, (const char *)path,
2261                        uni_path_len);
2262                 uni_path_len = copy_size;
2263                 path = copy_path;
2264         }
2265
2266         iov[1].iov_len = uni_path_len;
2267         iov[1].iov_base = path;
2268
2269         if (!server->oplocks)
2270                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2271
2272         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2273             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2274                 req->RequestedOplockLevel = *oplock;
2275         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2276                   (oparms->create_options & CREATE_NOT_FILE))
2277                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2278         else {
2279                 rc = add_lease_context(server, iov, &n_iov,
2280                                        oparms->fid->lease_key, oplock);
2281                 if (rc)
2282                         return rc;
2283         }
2284
2285         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2286                 /* need to set Next field of lease context if we request it */
2287                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2288                         struct create_context *ccontext =
2289                             (struct create_context *)iov[n_iov-1].iov_base;
2290                         ccontext->Next =
2291                                 cpu_to_le32(server->vals->create_lease_size);
2292                 }
2293
2294                 rc = add_durable_context(iov, &n_iov, oparms,
2295                                         tcon->use_persistent);
2296                 if (rc)
2297                         return rc;
2298         }
2299
2300         if (tcon->posix_extensions) {
2301                 if (n_iov > 2) {
2302                         struct create_context *ccontext =
2303                             (struct create_context *)iov[n_iov-1].iov_base;
2304                         ccontext->Next =
2305                                 cpu_to_le32(iov[n_iov-1].iov_len);
2306                 }
2307
2308                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2309                 if (rc)
2310                         return rc;
2311         }
2312
2313         if (tcon->snapshot_time) {
2314                 cifs_dbg(FYI, "adding snapshot context\n");
2315                 if (n_iov > 2) {
2316                         struct create_context *ccontext =
2317                             (struct create_context *)iov[n_iov-1].iov_base;
2318                         ccontext->Next =
2319                                 cpu_to_le32(iov[n_iov-1].iov_len);
2320                 }
2321
2322                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2323                 if (rc)
2324                         return rc;
2325         }
2326
2327
2328         rqst->rq_nvec = n_iov;
2329         return 0;
2330 }
2331
2332 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2333  * All other vectors are freed by kfree().
2334  */
2335 void
2336 SMB2_open_free(struct smb_rqst *rqst)
2337 {
2338         int i;
2339
2340         if (rqst && rqst->rq_iov) {
2341                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2342                 for (i = 1; i < rqst->rq_nvec; i++)
2343                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2344                                 kfree(rqst->rq_iov[i].iov_base);
2345         }
2346 }
2347
2348 int
2349 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2350           __u8 *oplock, struct smb2_file_all_info *buf,
2351           struct kvec *err_iov, int *buftype)
2352 {
2353         struct smb_rqst rqst;
2354         struct smb2_create_rsp *rsp = NULL;
2355         struct TCP_Server_Info *server;
2356         struct cifs_tcon *tcon = oparms->tcon;
2357         struct cifs_ses *ses = tcon->ses;
2358         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2359         struct kvec rsp_iov = {NULL, 0};
2360         int resp_buftype = CIFS_NO_BUFFER;
2361         int rc = 0;
2362         int flags = 0;
2363
2364         cifs_dbg(FYI, "create/open\n");
2365         if (ses && (ses->server))
2366                 server = ses->server;
2367         else
2368                 return -EIO;
2369
2370         if (smb3_encryption_required(tcon))
2371                 flags |= CIFS_TRANSFORM_REQ;
2372
2373         memset(&rqst, 0, sizeof(struct smb_rqst));
2374         memset(&iov, 0, sizeof(iov));
2375         rqst.rq_iov = iov;
2376         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2377
2378         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2379         if (rc)
2380                 goto creat_exit;
2381
2382         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2383                             &rsp_iov);
2384         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2385
2386         if (rc != 0) {
2387                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2388                 if (err_iov && rsp) {
2389                         *err_iov = rsp_iov;
2390                         *buftype = resp_buftype;
2391                         resp_buftype = CIFS_NO_BUFFER;
2392                         rsp = NULL;
2393                 }
2394                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2395                                     oparms->create_options, oparms->desired_access, rc);
2396                 goto creat_exit;
2397         } else
2398                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2399                                      ses->Suid, oparms->create_options,
2400                                      oparms->desired_access);
2401
2402         atomic_inc(&tcon->num_remote_opens);
2403         oparms->fid->persistent_fid = rsp->PersistentFileId;
2404         oparms->fid->volatile_fid = rsp->VolatileFileId;
2405 #ifdef CONFIG_CIFS_DEBUG2
2406         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2407 #endif /* CIFS_DEBUG2 */
2408
2409         if (buf) {
2410                 memcpy(buf, &rsp->CreationTime, 32);
2411                 buf->AllocationSize = rsp->AllocationSize;
2412                 buf->EndOfFile = rsp->EndofFile;
2413                 buf->Attributes = rsp->FileAttributes;
2414                 buf->NumberOfLinks = cpu_to_le32(1);
2415                 buf->DeletePending = 0;
2416         }
2417
2418         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2419                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2420                                             oparms->fid->lease_key);
2421         else
2422                 *oplock = rsp->OplockLevel;
2423 creat_exit:
2424         SMB2_open_free(&rqst);
2425         free_rsp_buf(resp_buftype, rsp);
2426         return rc;
2427 }
2428
2429 /*
2430  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2431  */
2432 int
2433 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2434            u64 volatile_fid, u32 opcode, bool is_fsctl,
2435            char *in_data, u32 indatalen,
2436            char **out_data, u32 *plen /* returned data len */)
2437 {
2438         struct smb_rqst rqst;
2439         struct smb2_ioctl_req *req;
2440         struct smb2_ioctl_rsp *rsp;
2441         struct cifs_ses *ses;
2442         struct kvec iov[2];
2443         struct kvec rsp_iov;
2444         int resp_buftype;
2445         int n_iov;
2446         int rc = 0;
2447         int flags = 0;
2448         unsigned int total_len;
2449
2450         cifs_dbg(FYI, "SMB2 IOCTL\n");
2451
2452         if (out_data != NULL)
2453                 *out_data = NULL;
2454
2455         /* zero out returned data len, in case of error */
2456         if (plen)
2457                 *plen = 0;
2458
2459         if (tcon)
2460                 ses = tcon->ses;
2461         else
2462                 return -EIO;
2463
2464         if (!ses || !(ses->server))
2465                 return -EIO;
2466
2467         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2468         if (rc)
2469                 return rc;
2470
2471         if (smb3_encryption_required(tcon))
2472                 flags |= CIFS_TRANSFORM_REQ;
2473
2474         req->CtlCode = cpu_to_le32(opcode);
2475         req->PersistentFileId = persistent_fid;
2476         req->VolatileFileId = volatile_fid;
2477
2478         if (indatalen) {
2479                 req->InputCount = cpu_to_le32(indatalen);
2480                 /* do not set InputOffset if no input data */
2481                 req->InputOffset =
2482                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2483                 iov[1].iov_base = in_data;
2484                 iov[1].iov_len = indatalen;
2485                 n_iov = 2;
2486         } else
2487                 n_iov = 1;
2488
2489         req->OutputOffset = 0;
2490         req->OutputCount = 0; /* MBZ */
2491
2492         /*
2493          * Could increase MaxOutputResponse, but that would require more
2494          * than one credit. Windows typically sets this smaller, but for some
2495          * ioctls it may be useful to allow server to send more. No point
2496          * limiting what the server can send as long as fits in one credit
2497          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2498          * (by default, note that it can be overridden to make max larger)
2499          * in responses (except for read responses which can be bigger.
2500          * We may want to bump this limit up
2501          */
2502         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2503
2504         if (is_fsctl)
2505                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2506         else
2507                 req->Flags = 0;
2508
2509         iov[0].iov_base = (char *)req;
2510
2511         /*
2512          * If no input data, the size of ioctl struct in
2513          * protocol spec still includes a 1 byte data buffer,
2514          * but if input data passed to ioctl, we do not
2515          * want to double count this, so we do not send
2516          * the dummy one byte of data in iovec[0] if sending
2517          * input data (in iovec[1]).
2518          */
2519
2520         if (indatalen) {
2521                 iov[0].iov_len = total_len - 1;
2522         } else
2523                 iov[0].iov_len = total_len;
2524
2525         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2526         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2527                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2528
2529         memset(&rqst, 0, sizeof(struct smb_rqst));
2530         rqst.rq_iov = iov;
2531         rqst.rq_nvec = n_iov;
2532
2533         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2534                             &rsp_iov);
2535         cifs_small_buf_release(req);
2536         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2537
2538         if (rc != 0)
2539                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2540                                 ses->Suid, 0, opcode, rc);
2541
2542         if ((rc != 0) && (rc != -EINVAL)) {
2543                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2544                 goto ioctl_exit;
2545         } else if (rc == -EINVAL) {
2546                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2547                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2548                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2549                         goto ioctl_exit;
2550                 }
2551         }
2552
2553         /* check if caller wants to look at return data or just return rc */
2554         if ((plen == NULL) || (out_data == NULL))
2555                 goto ioctl_exit;
2556
2557         *plen = le32_to_cpu(rsp->OutputCount);
2558
2559         /* We check for obvious errors in the output buffer length and offset */
2560         if (*plen == 0)
2561                 goto ioctl_exit; /* server returned no data */
2562         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2563                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2564                 *plen = 0;
2565                 rc = -EIO;
2566                 goto ioctl_exit;
2567         }
2568
2569         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2570                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2571                         le32_to_cpu(rsp->OutputOffset));
2572                 *plen = 0;
2573                 rc = -EIO;
2574                 goto ioctl_exit;
2575         }
2576
2577         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2578                             *plen, GFP_KERNEL);
2579         if (*out_data == NULL) {
2580                 rc = -ENOMEM;
2581                 goto ioctl_exit;
2582         }
2583
2584 ioctl_exit:
2585         free_rsp_buf(resp_buftype, rsp);
2586         return rc;
2587 }
2588
2589 /*
2590  *   Individual callers to ioctl worker function follow
2591  */
2592
2593 int
2594 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2595                      u64 persistent_fid, u64 volatile_fid)
2596 {
2597         int rc;
2598         struct  compress_ioctl fsctl_input;
2599         char *ret_data = NULL;
2600
2601         fsctl_input.CompressionState =
2602                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2603
2604         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2605                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2606                         (char *)&fsctl_input /* data input */,
2607                         2 /* in data len */, &ret_data /* out data */, NULL);
2608
2609         cifs_dbg(FYI, "set compression rc %d\n", rc);
2610
2611         return rc;
2612 }
2613
2614 int
2615 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2616                 u64 persistent_fid, u64 volatile_fid)
2617 {
2618         struct smb2_close_req *req;
2619         struct kvec *iov = rqst->rq_iov;
2620         unsigned int total_len;
2621         int rc;
2622
2623         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2624         if (rc)
2625                 return rc;
2626
2627         req->PersistentFileId = persistent_fid;
2628         req->VolatileFileId = volatile_fid;
2629         iov[0].iov_base = (char *)req;
2630         iov[0].iov_len = total_len;
2631
2632         return 0;
2633 }
2634
2635 void
2636 SMB2_close_free(struct smb_rqst *rqst)
2637 {
2638         if (rqst && rqst->rq_iov)
2639                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2640 }
2641
2642 int
2643 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2644                  u64 persistent_fid, u64 volatile_fid, int flags)
2645 {
2646         struct smb_rqst rqst;
2647         struct smb2_close_rsp *rsp = NULL;
2648         struct cifs_ses *ses = tcon->ses;
2649         struct kvec iov[1];
2650         struct kvec rsp_iov;
2651         int resp_buftype = CIFS_NO_BUFFER;
2652         int rc = 0;
2653
2654         cifs_dbg(FYI, "Close\n");
2655
2656         if (!ses || !(ses->server))
2657                 return -EIO;
2658
2659         if (smb3_encryption_required(tcon))
2660                 flags |= CIFS_TRANSFORM_REQ;
2661
2662         memset(&rqst, 0, sizeof(struct smb_rqst));
2663         memset(&iov, 0, sizeof(iov));
2664         rqst.rq_iov = iov;
2665         rqst.rq_nvec = 1;
2666
2667         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2668         if (rc)
2669                 goto close_exit;
2670
2671         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2672         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2673
2674         if (rc != 0) {
2675                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2676                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2677                                      rc);
2678                 goto close_exit;
2679         }
2680
2681         atomic_dec(&tcon->num_remote_opens);
2682
2683         /* BB FIXME - decode close response, update inode for caching */
2684
2685 close_exit:
2686         SMB2_close_free(&rqst);
2687         free_rsp_buf(resp_buftype, rsp);
2688         return rc;
2689 }
2690
2691 int
2692 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2693            u64 persistent_fid, u64 volatile_fid)
2694 {
2695         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2696 }
2697
2698 int
2699 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2700                   struct kvec *iov, unsigned int min_buf_size)
2701 {
2702         unsigned int smb_len = iov->iov_len;
2703         char *end_of_smb = smb_len + (char *)iov->iov_base;
2704         char *begin_of_buf = offset + (char *)iov->iov_base;
2705         char *end_of_buf = begin_of_buf + buffer_length;
2706
2707
2708         if (buffer_length < min_buf_size) {
2709                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2710                          buffer_length, min_buf_size);
2711                 return -EINVAL;
2712         }
2713
2714         /* check if beyond RFC1001 maximum length */
2715         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2716                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2717                          buffer_length, smb_len);
2718                 return -EINVAL;
2719         }
2720
2721         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2722                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2723                 return -EINVAL;
2724         }
2725
2726         return 0;
2727 }
2728
2729 /*
2730  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2731  * Caller must free buffer.
2732  */
2733 int
2734 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2735                            struct kvec *iov, unsigned int minbufsize,
2736                            char *data)
2737 {
2738         char *begin_of_buf = offset + (char *)iov->iov_base;
2739         int rc;
2740
2741         if (!data)
2742                 return -EINVAL;
2743
2744         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2745         if (rc)
2746                 return rc;
2747
2748         memcpy(data, begin_of_buf, buffer_length);
2749
2750         return 0;
2751 }
2752
2753 int
2754 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2755                      u64 persistent_fid, u64 volatile_fid,
2756                      u8 info_class, u8 info_type, u32 additional_info,
2757                      size_t output_len, size_t input_len, void *input)
2758 {
2759         struct smb2_query_info_req *req;
2760         struct kvec *iov = rqst->rq_iov;
2761         unsigned int total_len;
2762         int rc;
2763
2764         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2765                              &total_len);
2766         if (rc)
2767                 return rc;
2768
2769         req->InfoType = info_type;
2770         req->FileInfoClass = info_class;
2771         req->PersistentFileId = persistent_fid;
2772         req->VolatileFileId = volatile_fid;
2773         req->AdditionalInformation = cpu_to_le32(additional_info);
2774
2775         req->OutputBufferLength = cpu_to_le32(output_len);
2776         if (input_len) {
2777                 req->InputBufferLength = cpu_to_le32(input_len);
2778                 /* total_len for smb query request never close to le16 max */
2779                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2780                 memcpy(req->Buffer, input, input_len);
2781         }
2782
2783         iov[0].iov_base = (char *)req;
2784         /* 1 for Buffer */
2785         iov[0].iov_len = total_len - 1 + input_len;
2786         return 0;
2787 }
2788
2789 void
2790 SMB2_query_info_free(struct smb_rqst *rqst)
2791 {
2792         if (rqst && rqst->rq_iov)
2793                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2794 }
2795
2796 static int
2797 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2798            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2799            u32 additional_info, size_t output_len, size_t min_len, void **data,
2800                 u32 *dlen)
2801 {
2802         struct smb_rqst rqst;
2803         struct smb2_query_info_rsp *rsp = NULL;
2804         struct kvec iov[1];
2805         struct kvec rsp_iov;
2806         int rc = 0;
2807         int resp_buftype = CIFS_NO_BUFFER;
2808         struct cifs_ses *ses = tcon->ses;
2809         int flags = 0;
2810
2811         cifs_dbg(FYI, "Query Info\n");
2812
2813         if (!ses || !(ses->server))
2814                 return -EIO;
2815
2816         if (smb3_encryption_required(tcon))
2817                 flags |= CIFS_TRANSFORM_REQ;
2818
2819         memset(&rqst, 0, sizeof(struct smb_rqst));
2820         memset(&iov, 0, sizeof(iov));
2821         rqst.rq_iov = iov;
2822         rqst.rq_nvec = 1;
2823
2824         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2825                                   info_class, info_type, additional_info,
2826                                   output_len, 0, NULL);
2827         if (rc)
2828                 goto qinf_exit;
2829
2830         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2831         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2832
2833         if (rc) {
2834                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2835                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2836                                 ses->Suid, info_class, (__u32)info_type, rc);
2837                 goto qinf_exit;
2838         }
2839
2840         if (dlen) {
2841                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2842                 if (!*data) {
2843                         *data = kmalloc(*dlen, GFP_KERNEL);
2844                         if (!*data) {
2845                                 cifs_dbg(VFS,
2846                                         "Error %d allocating memory for acl\n",
2847                                         rc);
2848                                 *dlen = 0;
2849                                 goto qinf_exit;
2850                         }
2851                 }
2852         }
2853
2854         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2855                                         le32_to_cpu(rsp->OutputBufferLength),
2856                                         &rsp_iov, min_len, *data);
2857
2858 qinf_exit:
2859         SMB2_query_info_free(&rqst);
2860         free_rsp_buf(resp_buftype, rsp);
2861         return rc;
2862 }
2863
2864 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2865         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2866 {
2867         return query_info(xid, tcon, persistent_fid, volatile_fid,
2868                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2869                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2870                           sizeof(struct smb2_file_all_info), (void **)&data,
2871                           NULL);
2872 }
2873
2874 int
2875 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2876                 u64 persistent_fid, u64 volatile_fid,
2877                 void **data, u32 *plen)
2878 {
2879         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2880         *plen = 0;
2881
2882         return query_info(xid, tcon, persistent_fid, volatile_fid,
2883                           0, SMB2_O_INFO_SECURITY, additional_info,
2884                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2885 }
2886
2887 int
2888 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2889                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2890 {
2891         return query_info(xid, tcon, persistent_fid, volatile_fid,
2892                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2893                           sizeof(struct smb2_file_internal_info),
2894                           sizeof(struct smb2_file_internal_info),
2895                           (void **)&uniqueid, NULL);
2896 }
2897
2898 /*
2899  * This is a no-op for now. We're not really interested in the reply, but
2900  * rather in the fact that the server sent one and that server->lstrp
2901  * gets updated.
2902  *
2903  * FIXME: maybe we should consider checking that the reply matches request?
2904  */
2905 static void
2906 smb2_echo_callback(struct mid_q_entry *mid)
2907 {
2908         struct TCP_Server_Info *server = mid->callback_data;
2909         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2910         unsigned int credits_received = 1;
2911
2912         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2913                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2914
2915         DeleteMidQEntry(mid);
2916         add_credits(server, credits_received, CIFS_ECHO_OP);
2917 }
2918
2919 void smb2_reconnect_server(struct work_struct *work)
2920 {
2921         struct TCP_Server_Info *server = container_of(work,
2922                                         struct TCP_Server_Info, reconnect.work);
2923         struct cifs_ses *ses;
2924         struct cifs_tcon *tcon, *tcon2;
2925         struct list_head tmp_list;
2926         int tcon_exist = false;
2927         int rc;
2928         int resched = false;
2929
2930
2931         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2932         mutex_lock(&server->reconnect_mutex);
2933
2934         INIT_LIST_HEAD(&tmp_list);
2935         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2936
2937         spin_lock(&cifs_tcp_ses_lock);
2938         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2939                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2940                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2941                                 tcon->tc_count++;
2942                                 list_add_tail(&tcon->rlist, &tmp_list);
2943                                 tcon_exist = true;
2944                         }
2945                 }
2946                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2947                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2948                         tcon_exist = true;
2949                 }
2950         }
2951         /*
2952          * Get the reference to server struct to be sure that the last call of
2953          * cifs_put_tcon() in the loop below won't release the server pointer.
2954          */
2955         if (tcon_exist)
2956                 server->srv_count++;
2957
2958         spin_unlock(&cifs_tcp_ses_lock);
2959
2960         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2961                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2962                 if (!rc)
2963                         cifs_reopen_persistent_handles(tcon);
2964                 else
2965                         resched = true;
2966                 list_del_init(&tcon->rlist);
2967                 cifs_put_tcon(tcon);
2968         }
2969
2970         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2971         if (resched)
2972                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2973         mutex_unlock(&server->reconnect_mutex);
2974
2975         /* now we can safely release srv struct */
2976         if (tcon_exist)
2977                 cifs_put_tcp_session(server, 1);
2978 }
2979
2980 int
2981 SMB2_echo(struct TCP_Server_Info *server)
2982 {
2983         struct smb2_echo_req *req;
2984         int rc = 0;
2985         struct kvec iov[1];
2986         struct smb_rqst rqst = { .rq_iov = iov,
2987                                  .rq_nvec = 1 };
2988         unsigned int total_len;
2989
2990         cifs_dbg(FYI, "In echo request\n");
2991
2992         if (server->tcpStatus == CifsNeedNegotiate) {
2993                 /* No need to send echo on newly established connections */
2994                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2995                 return rc;
2996         }
2997
2998         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2999         if (rc)
3000                 return rc;
3001
3002         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3003
3004         iov[0].iov_len = total_len;
3005         iov[0].iov_base = (char *)req;
3006
3007         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3008                              server, CIFS_ECHO_OP);
3009         if (rc)
3010                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3011
3012         cifs_small_buf_release(req);
3013         return rc;
3014 }
3015
3016 int
3017 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3018            u64 volatile_fid)
3019 {
3020         struct smb_rqst rqst;
3021         struct smb2_flush_req *req;
3022         struct cifs_ses *ses = tcon->ses;
3023         struct kvec iov[1];
3024         struct kvec rsp_iov;
3025         int resp_buftype;
3026         int rc = 0;
3027         int flags = 0;
3028         unsigned int total_len;
3029
3030         cifs_dbg(FYI, "Flush\n");
3031
3032         if (!ses || !(ses->server))
3033                 return -EIO;
3034
3035         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3036         if (rc)
3037                 return rc;
3038
3039         if (smb3_encryption_required(tcon))
3040                 flags |= CIFS_TRANSFORM_REQ;
3041
3042         req->PersistentFileId = persistent_fid;
3043         req->VolatileFileId = volatile_fid;
3044
3045         iov[0].iov_base = (char *)req;
3046         iov[0].iov_len = total_len;
3047
3048         memset(&rqst, 0, sizeof(struct smb_rqst));
3049         rqst.rq_iov = iov;
3050         rqst.rq_nvec = 1;
3051
3052         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3053         cifs_small_buf_release(req);
3054
3055         if (rc != 0) {
3056                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3057                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3058                                      rc);
3059         }
3060
3061         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3062         return rc;
3063 }
3064
3065 /*
3066  * To form a chain of read requests, any read requests after the first should
3067  * have the end_of_chain boolean set to true.
3068  */
3069 static int
3070 smb2_new_read_req(void **buf, unsigned int *total_len,
3071         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3072         unsigned int remaining_bytes, int request_type)
3073 {
3074         int rc = -EACCES;
3075         struct smb2_read_plain_req *req = NULL;
3076         struct smb2_sync_hdr *shdr;
3077         struct TCP_Server_Info *server;
3078
3079         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3080                                  total_len);
3081         if (rc)
3082                 return rc;
3083
3084         server = io_parms->tcon->ses->server;
3085         if (server == NULL)
3086                 return -ECONNABORTED;
3087
3088         shdr = &req->sync_hdr;
3089         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3090
3091         req->PersistentFileId = io_parms->persistent_fid;
3092         req->VolatileFileId = io_parms->volatile_fid;
3093         req->ReadChannelInfoOffset = 0; /* reserved */
3094         req->ReadChannelInfoLength = 0; /* reserved */
3095         req->Channel = 0; /* reserved */
3096         req->MinimumCount = 0;
3097         req->Length = cpu_to_le32(io_parms->length);
3098         req->Offset = cpu_to_le64(io_parms->offset);
3099 #ifdef CONFIG_CIFS_SMB_DIRECT
3100         /*
3101          * If we want to do a RDMA write, fill in and append
3102          * smbd_buffer_descriptor_v1 to the end of read request
3103          */
3104         if (server->rdma && rdata && !server->sign &&
3105                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3106
3107                 struct smbd_buffer_descriptor_v1 *v1;
3108                 bool need_invalidate =
3109                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3110
3111                 rdata->mr = smbd_register_mr(
3112                                 server->smbd_conn, rdata->pages,
3113                                 rdata->nr_pages, rdata->page_offset,
3114                                 rdata->tailsz, true, need_invalidate);
3115                 if (!rdata->mr)
3116                         return -ENOBUFS;
3117
3118                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3119                 if (need_invalidate)
3120                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3121                 req->ReadChannelInfoOffset =
3122                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3123                 req->ReadChannelInfoLength =
3124                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3125                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3126                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3127                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3128                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3129
3130                 *total_len += sizeof(*v1) - 1;
3131         }
3132 #endif
3133         if (request_type & CHAINED_REQUEST) {
3134                 if (!(request_type & END_OF_CHAIN)) {
3135                         /* next 8-byte aligned request */
3136                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3137                         shdr->NextCommand = cpu_to_le32(*total_len);
3138                 } else /* END_OF_CHAIN */
3139                         shdr->NextCommand = 0;
3140                 if (request_type & RELATED_REQUEST) {
3141                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3142                         /*
3143                          * Related requests use info from previous read request
3144                          * in chain.
3145                          */
3146                         shdr->SessionId = 0xFFFFFFFF;
3147                         shdr->TreeId = 0xFFFFFFFF;
3148                         req->PersistentFileId = 0xFFFFFFFF;
3149                         req->VolatileFileId = 0xFFFFFFFF;
3150                 }
3151         }
3152         if (remaining_bytes > io_parms->length)
3153                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3154         else
3155                 req->RemainingBytes = 0;
3156
3157         *buf = req;
3158         return rc;
3159 }
3160
3161 static void
3162 smb2_readv_callback(struct mid_q_entry *mid)
3163 {
3164         struct cifs_readdata *rdata = mid->callback_data;
3165         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3166         struct TCP_Server_Info *server = tcon->ses->server;
3167         struct smb2_sync_hdr *shdr =
3168                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3169         unsigned int credits_received = 1;
3170         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3171                                  .rq_nvec = 2,
3172                                  .rq_pages = rdata->pages,
3173                                  .rq_offset = rdata->page_offset,
3174                                  .rq_npages = rdata->nr_pages,
3175                                  .rq_pagesz = rdata->pagesz,
3176                                  .rq_tailsz = rdata->tailsz };
3177
3178         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3179                  __func__, mid->mid, mid->mid_state, rdata->result,
3180                  rdata->bytes);
3181
3182         switch (mid->mid_state) {
3183         case MID_RESPONSE_RECEIVED:
3184                 credits_received = le16_to_cpu(shdr->CreditRequest);
3185                 /* result already set, check signature */
3186                 if (server->sign && !mid->decrypted) {
3187                         int rc;
3188
3189                         rc = smb2_verify_signature(&rqst, server);
3190                         if (rc)
3191                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3192                                          rc);
3193                 }
3194                 /* FIXME: should this be counted toward the initiating task? */
3195                 task_io_account_read(rdata->got_bytes);
3196                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3197                 break;
3198         case MID_REQUEST_SUBMITTED:
3199         case MID_RETRY_NEEDED:
3200                 rdata->result = -EAGAIN;
3201                 if (server->sign && rdata->got_bytes)
3202                         /* reset bytes number since we can not check a sign */
3203                         rdata->got_bytes = 0;
3204                 /* FIXME: should this be counted toward the initiating task? */
3205                 task_io_account_read(rdata->got_bytes);
3206                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3207                 break;
3208         default:
3209                 if (rdata->result != -ENODATA)
3210                         rdata->result = -EIO;
3211         }
3212 #ifdef CONFIG_CIFS_SMB_DIRECT
3213         /*
3214          * If this rdata has a memmory registered, the MR can be freed
3215          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3216          * because they have limited number and are used for future I/Os
3217          */
3218         if (rdata->mr) {
3219                 smbd_deregister_mr(rdata->mr);
3220                 rdata->mr = NULL;
3221         }
3222 #endif
3223         if (rdata->result)
3224                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3225
3226         queue_work(cifsiod_wq, &rdata->work);
3227         DeleteMidQEntry(mid);
3228         add_credits(server, credits_received, 0);
3229 }
3230
3231 /* smb2_async_readv - send an async read, and set up mid to handle result */
3232 int
3233 smb2_async_readv(struct cifs_readdata *rdata)
3234 {
3235         int rc, flags = 0;
3236         char *buf;
3237         struct smb2_sync_hdr *shdr;
3238         struct cifs_io_parms io_parms;
3239         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3240                                  .rq_nvec = 1 };
3241         struct TCP_Server_Info *server;
3242         unsigned int total_len;
3243
3244         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3245                  __func__, rdata->offset, rdata->bytes);
3246
3247         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3248         io_parms.offset = rdata->offset;
3249         io_parms.length = rdata->bytes;
3250         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3251         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3252         io_parms.pid = rdata->pid;
3253
3254         server = io_parms.tcon->ses->server;
3255
3256         rc = smb2_new_read_req(
3257                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3258         if (rc) {
3259                 if (rc == -EAGAIN && rdata->credits) {
3260                         /* credits was reset by reconnect */
3261                         rdata->credits = 0;
3262                         /* reduce in_flight value since we won't send the req */
3263                         spin_lock(&server->req_lock);
3264                         server->in_flight--;
3265                         spin_unlock(&server->req_lock);
3266                 }
3267                 return rc;
3268         }
3269
3270         if (smb3_encryption_required(io_parms.tcon))
3271                 flags |= CIFS_TRANSFORM_REQ;
3272
3273         rdata->iov[0].iov_base = buf;
3274         rdata->iov[0].iov_len = total_len;
3275
3276         shdr = (struct smb2_sync_hdr *)buf;
3277
3278         if (rdata->credits) {
3279                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3280                                                 SMB2_MAX_BUFFER_SIZE));
3281                 shdr->CreditRequest = shdr->CreditCharge;
3282                 spin_lock(&server->req_lock);
3283                 server->credits += rdata->credits -
3284                                                 le16_to_cpu(shdr->CreditCharge);
3285                 spin_unlock(&server->req_lock);
3286                 wake_up(&server->request_q);
3287                 flags |= CIFS_HAS_CREDITS;
3288         }
3289
3290         kref_get(&rdata->refcount);
3291         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3292                              cifs_readv_receive, smb2_readv_callback,
3293                              smb3_handle_read_data, rdata, flags);
3294         if (rc) {
3295                 kref_put(&rdata->refcount, cifs_readdata_release);
3296                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3297                 trace_smb3_read_err(rc, 0 /* xid */, io_parms.persistent_fid,
3298                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3299                                    io_parms.offset, io_parms.length);
3300         } else
3301                 trace_smb3_read_done(0 /* xid */, io_parms.persistent_fid,
3302                                    io_parms.tcon->tid, io_parms.tcon->ses->Suid,
3303                                    io_parms.offset, io_parms.length);
3304
3305         cifs_small_buf_release(buf);
3306         return rc;
3307 }
3308
3309 int
3310 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3311           unsigned int *nbytes, char **buf, int *buf_type)
3312 {
3313         struct smb_rqst rqst;
3314         int resp_buftype, rc = -EACCES;
3315         struct smb2_read_plain_req *req = NULL;
3316         struct smb2_read_rsp *rsp = NULL;
3317         struct kvec iov[1];
3318         struct kvec rsp_iov;
3319         unsigned int total_len;
3320         int flags = CIFS_LOG_ERROR;
3321         struct cifs_ses *ses = io_parms->tcon->ses;
3322
3323         *nbytes = 0;
3324         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3325         if (rc)
3326                 return rc;
3327
3328         if (smb3_encryption_required(io_parms->tcon))
3329                 flags |= CIFS_TRANSFORM_REQ;
3330
3331         iov[0].iov_base = (char *)req;
3332         iov[0].iov_len = total_len;
3333
3334         memset(&rqst, 0, sizeof(struct smb_rqst));
3335         rqst.rq_iov = iov;
3336         rqst.rq_nvec = 1;
3337
3338         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3339         cifs_small_buf_release(req);
3340
3341         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3342
3343         if (rc) {
3344                 if (rc != -ENODATA) {
3345                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3346                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3347                 }
3348                 trace_smb3_read_err(rc, xid, req->PersistentFileId,
3349                                     io_parms->tcon->tid, ses->Suid,
3350                                     io_parms->offset, io_parms->length);
3351                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3352                 return rc == -ENODATA ? 0 : rc;
3353         } else
3354                 trace_smb3_read_done(xid, req->PersistentFileId,
3355                                     io_parms->tcon->tid, ses->Suid,
3356                                     io_parms->offset, io_parms->length);
3357
3358         *nbytes = le32_to_cpu(rsp->DataLength);
3359         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3360             (*nbytes > io_parms->length)) {
3361                 cifs_dbg(FYI, "bad length %d for count %d\n",
3362                          *nbytes, io_parms->length);
3363                 rc = -EIO;
3364                 *nbytes = 0;
3365         }
3366
3367         if (*buf) {
3368                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3369                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3370         } else if (resp_buftype != CIFS_NO_BUFFER) {
3371                 *buf = rsp_iov.iov_base;
3372                 if (resp_buftype == CIFS_SMALL_BUFFER)
3373                         *buf_type = CIFS_SMALL_BUFFER;
3374                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3375                         *buf_type = CIFS_LARGE_BUFFER;
3376         }
3377         return rc;
3378 }
3379
3380 /*
3381  * Check the mid_state and signature on received buffer (if any), and queue the
3382  * workqueue completion task.
3383  */
3384 static void
3385 smb2_writev_callback(struct mid_q_entry *mid)
3386 {
3387         struct cifs_writedata *wdata = mid->callback_data;
3388         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3389         unsigned int written;
3390         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3391         unsigned int credits_received = 1;
3392
3393         switch (mid->mid_state) {
3394         case MID_RESPONSE_RECEIVED:
3395                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3396                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3397                 if (wdata->result != 0)
3398                         break;
3399
3400                 written = le32_to_cpu(rsp->DataLength);
3401                 /*
3402                  * Mask off high 16 bits when bytes written as returned
3403                  * by the server is greater than bytes requested by the
3404                  * client. OS/2 servers are known to set incorrect
3405                  * CountHigh values.
3406                  */
3407                 if (written > wdata->bytes)
3408                         written &= 0xFFFF;
3409
3410                 if (written < wdata->bytes)
3411                         wdata->result = -ENOSPC;
3412                 else
3413                         wdata->bytes = written;
3414                 break;
3415         case MID_REQUEST_SUBMITTED:
3416         case MID_RETRY_NEEDED:
3417                 wdata->result = -EAGAIN;
3418                 break;
3419         default:
3420                 wdata->result = -EIO;
3421                 break;
3422         }
3423 #ifdef CONFIG_CIFS_SMB_DIRECT
3424         /*
3425          * If this wdata has a memory registered, the MR can be freed
3426          * The number of MRs available is limited, it's important to recover
3427          * used MR as soon as I/O is finished. Hold MR longer in the later
3428          * I/O process can possibly result in I/O deadlock due to lack of MR
3429          * to send request on I/O retry
3430          */
3431         if (wdata->mr) {
3432                 smbd_deregister_mr(wdata->mr);
3433                 wdata->mr = NULL;
3434         }
3435 #endif
3436         if (wdata->result)
3437                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3438
3439         queue_work(cifsiod_wq, &wdata->work);
3440         DeleteMidQEntry(mid);
3441         add_credits(tcon->ses->server, credits_received, 0);
3442 }
3443
3444 /* smb2_async_writev - send an async write, and set up mid to handle result */
3445 int
3446 smb2_async_writev(struct cifs_writedata *wdata,
3447                   void (*release)(struct kref *kref))
3448 {
3449         int rc = -EACCES, flags = 0;
3450         struct smb2_write_req *req = NULL;
3451         struct smb2_sync_hdr *shdr;
3452         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3453         struct TCP_Server_Info *server = tcon->ses->server;
3454         struct kvec iov[1];
3455         struct smb_rqst rqst = { };
3456         unsigned int total_len;
3457
3458         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3459         if (rc) {
3460                 if (rc == -EAGAIN && wdata->credits) {
3461                         /* credits was reset by reconnect */
3462                         wdata->credits = 0;
3463                         /* reduce in_flight value since we won't send the req */
3464                         spin_lock(&server->req_lock);
3465                         server->in_flight--;
3466                         spin_unlock(&server->req_lock);
3467                 }
3468                 goto async_writev_out;
3469         }
3470
3471         if (smb3_encryption_required(tcon))
3472                 flags |= CIFS_TRANSFORM_REQ;
3473
3474         shdr = (struct smb2_sync_hdr *)req;
3475         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3476
3477         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3478         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3479         req->WriteChannelInfoOffset = 0;
3480         req->WriteChannelInfoLength = 0;
3481         req->Channel = 0;
3482         req->Offset = cpu_to_le64(wdata->offset);
3483         req->DataOffset = cpu_to_le16(
3484                                 offsetof(struct smb2_write_req, Buffer));
3485         req->RemainingBytes = 0;
3486 #ifdef CONFIG_CIFS_SMB_DIRECT
3487         /*
3488          * If we want to do a server RDMA read, fill in and append
3489          * smbd_buffer_descriptor_v1 to the end of write request
3490          */
3491         if (server->rdma && !server->sign && wdata->bytes >=
3492                 server->smbd_conn->rdma_readwrite_threshold) {
3493
3494                 struct smbd_buffer_descriptor_v1 *v1;
3495                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3496
3497                 wdata->mr = smbd_register_mr(
3498                                 server->smbd_conn, wdata->pages,
3499                                 wdata->nr_pages, wdata->page_offset,
3500                                 wdata->tailsz, false, need_invalidate);
3501                 if (!wdata->mr) {
3502                         rc = -ENOBUFS;
3503                         goto async_writev_out;
3504                 }
3505                 req->Length = 0;
3506                 req->DataOffset = 0;
3507                 if (wdata->nr_pages > 1)
3508                         req->RemainingBytes =
3509                                 cpu_to_le32(
3510                                         (wdata->nr_pages - 1) * wdata->pagesz -
3511                                         wdata->page_offset + wdata->tailsz
3512                                 );
3513                 else
3514                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3515                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3516                 if (need_invalidate)
3517                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3518                 req->WriteChannelInfoOffset =
3519                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3520                 req->WriteChannelInfoLength =
3521                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3522                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3523                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3524                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3525                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3526         }
3527 #endif
3528         iov[0].iov_len = total_len - 1;
3529         iov[0].iov_base = (char *)req;
3530
3531         rqst.rq_iov = iov;
3532         rqst.rq_nvec = 1;
3533         rqst.rq_pages = wdata->pages;
3534         rqst.rq_offset = wdata->page_offset;
3535         rqst.rq_npages = wdata->nr_pages;
3536         rqst.rq_pagesz = wdata->pagesz;
3537         rqst.rq_tailsz = wdata->tailsz;
3538 #ifdef CONFIG_CIFS_SMB_DIRECT
3539         if (wdata->mr) {
3540                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3541                 rqst.rq_npages = 0;
3542         }
3543 #endif
3544         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3545                  wdata->offset, wdata->bytes);
3546
3547 #ifdef CONFIG_CIFS_SMB_DIRECT
3548         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3549         if (!wdata->mr)
3550                 req->Length = cpu_to_le32(wdata->bytes);
3551 #else
3552         req->Length = cpu_to_le32(wdata->bytes);
3553 #endif
3554
3555         if (wdata->credits) {
3556                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3557                                                     SMB2_MAX_BUFFER_SIZE));
3558                 shdr->CreditRequest = shdr->CreditCharge;
3559                 spin_lock(&server->req_lock);
3560                 server->credits += wdata->credits -
3561                                                 le16_to_cpu(shdr->CreditCharge);
3562                 spin_unlock(&server->req_lock);
3563                 wake_up(&server->request_q);
3564                 flags |= CIFS_HAS_CREDITS;
3565         }
3566
3567         kref_get(&wdata->refcount);
3568         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3569                              wdata, flags);
3570
3571         if (rc) {
3572                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3573                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3574                                      wdata->bytes, rc);
3575                 kref_put(&wdata->refcount, release);
3576                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3577         } else
3578                 trace_smb3_write_done(0 /* no xid */, req->PersistentFileId,
3579                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3580                                      wdata->bytes);
3581
3582 async_writev_out:
3583         cifs_small_buf_release(req);
3584         return rc;
3585 }
3586
3587 /*
3588  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3589  * The length field from io_parms must be at least 1 and indicates a number of
3590  * elements with data to write that begins with position 1 in iov array. All
3591  * data length is specified by count.
3592  */
3593 int
3594 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3595            unsigned int *nbytes, struct kvec *iov, int n_vec)
3596 {
3597         struct smb_rqst rqst;
3598         int rc = 0;
3599         struct smb2_write_req *req = NULL;
3600         struct smb2_write_rsp *rsp = NULL;
3601         int resp_buftype;
3602         struct kvec rsp_iov;
3603         int flags = 0;
3604         unsigned int total_len;
3605
3606         *nbytes = 0;
3607
3608         if (n_vec < 1)
3609                 return rc;
3610
3611         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3612                              &total_len);
3613         if (rc)
3614                 return rc;
3615
3616         if (io_parms->tcon->ses->server == NULL)
3617                 return -ECONNABORTED;
3618
3619         if (smb3_encryption_required(io_parms->tcon))
3620                 flags |= CIFS_TRANSFORM_REQ;
3621
3622         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3623
3624         req->PersistentFileId = io_parms->persistent_fid;
3625         req->VolatileFileId = io_parms->volatile_fid;
3626         req->WriteChannelInfoOffset = 0;
3627         req->WriteChannelInfoLength = 0;
3628         req->Channel = 0;
3629         req->Length = cpu_to_le32(io_parms->length);
3630         req->Offset = cpu_to_le64(io_parms->offset);
3631         req->DataOffset = cpu_to_le16(
3632                                 offsetof(struct smb2_write_req, Buffer));
3633         req->RemainingBytes = 0;
3634
3635         iov[0].iov_base = (char *)req;
3636         /* 1 for Buffer */
3637         iov[0].iov_len = total_len - 1;
3638
3639         memset(&rqst, 0, sizeof(struct smb_rqst));
3640         rqst.rq_iov = iov;
3641         rqst.rq_nvec = n_vec + 1;
3642
3643         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3644                             &resp_buftype, flags, &rsp_iov);
3645         cifs_small_buf_release(req);
3646         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3647
3648         if (rc) {
3649                 trace_smb3_write_err(xid, req->PersistentFileId,
3650                                      io_parms->tcon->tid,
3651                                      io_parms->tcon->ses->Suid,
3652                                      io_parms->offset, io_parms->length, rc);
3653                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3654                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3655         } else {
3656                 *nbytes = le32_to_cpu(rsp->DataLength);
3657                 trace_smb3_write_done(xid, req->PersistentFileId,
3658                                      io_parms->tcon->tid,
3659                                      io_parms->tcon->ses->Suid,
3660                                      io_parms->offset, *nbytes);
3661         }
3662
3663         free_rsp_buf(resp_buftype, rsp);
3664         return rc;
3665 }
3666
3667 static unsigned int
3668 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3669 {
3670         int len;
3671         unsigned int entrycount = 0;
3672         unsigned int next_offset = 0;
3673         char *entryptr;
3674         FILE_DIRECTORY_INFO *dir_info;
3675
3676         if (bufstart == NULL)
3677                 return 0;
3678
3679         entryptr = bufstart;
3680
3681         while (1) {
3682                 if (entryptr + next_offset < entryptr ||
3683                     entryptr + next_offset > end_of_buf ||
3684                     entryptr + next_offset + size > end_of_buf) {
3685                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3686                         break;
3687                 }
3688
3689                 entryptr = entryptr + next_offset;
3690                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3691
3692                 len = le32_to_cpu(dir_info->FileNameLength);
3693                 if (entryptr + len < entryptr ||
3694                     entryptr + len > end_of_buf ||
3695                     entryptr + len + size > end_of_buf) {
3696                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3697                                  end_of_buf);
3698                         break;
3699                 }
3700
3701                 *lastentry = entryptr;
3702                 entrycount++;
3703
3704                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3705                 if (!next_offset)
3706                         break;
3707         }
3708
3709         return entrycount;
3710 }
3711
3712 /*
3713  * Readdir/FindFirst
3714  */
3715 int
3716 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3717                      u64 persistent_fid, u64 volatile_fid, int index,
3718                      struct cifs_search_info *srch_inf)
3719 {
3720         struct smb_rqst rqst;
3721         struct smb2_query_directory_req *req;
3722         struct smb2_query_directory_rsp *rsp = NULL;
3723         struct kvec iov[2];
3724         struct kvec rsp_iov;
3725         int rc = 0;
3726         int len;
3727         int resp_buftype = CIFS_NO_BUFFER;
3728         unsigned char *bufptr;
3729         struct TCP_Server_Info *server;
3730         struct cifs_ses *ses = tcon->ses;
3731         __le16 asteriks = cpu_to_le16('*');
3732         char *end_of_smb;
3733         unsigned int output_size = CIFSMaxBufSize;
3734         size_t info_buf_size;
3735         int flags = 0;
3736         unsigned int total_len;
3737
3738         if (ses && (ses->server))
3739                 server = ses->server;
3740         else
3741                 return -EIO;
3742
3743         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3744                              &total_len);
3745         if (rc)
3746                 return rc;
3747
3748         if (smb3_encryption_required(tcon))
3749                 flags |= CIFS_TRANSFORM_REQ;
3750
3751         switch (srch_inf->info_level) {
3752         case SMB_FIND_FILE_DIRECTORY_INFO:
3753                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3754                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3755                 break;
3756         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3757                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3758                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3759                 break;
3760         default:
3761                 cifs_dbg(VFS, "info level %u isn't supported\n",
3762                          srch_inf->info_level);
3763                 rc = -EINVAL;
3764                 goto qdir_exit;
3765         }
3766
3767         req->FileIndex = cpu_to_le32(index);
3768         req->PersistentFileId = persistent_fid;
3769         req->VolatileFileId = volatile_fid;
3770
3771         len = 0x2;
3772         bufptr = req->Buffer;
3773         memcpy(bufptr, &asteriks, len);
3774
3775         req->FileNameOffset =
3776                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3777         req->FileNameLength = cpu_to_le16(len);
3778         /*
3779          * BB could be 30 bytes or so longer if we used SMB2 specific
3780          * buffer lengths, but this is safe and close enough.
3781          */
3782         output_size = min_t(unsigned int, output_size, server->maxBuf);
3783         output_size = min_t(unsigned int, output_size, 2 << 15);
3784         req->OutputBufferLength = cpu_to_le32(output_size);
3785
3786         iov[0].iov_base = (char *)req;
3787         /* 1 for Buffer */
3788         iov[0].iov_len = total_len - 1;
3789
3790         iov[1].iov_base = (char *)(req->Buffer);
3791         iov[1].iov_len = len;
3792
3793         memset(&rqst, 0, sizeof(struct smb_rqst));
3794         rqst.rq_iov = iov;
3795         rqst.rq_nvec = 2;
3796
3797         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3798         cifs_small_buf_release(req);
3799         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3800
3801         if (rc) {
3802                 if (rc == -ENODATA &&
3803                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3804                         srch_inf->endOfSearch = true;
3805                         rc = 0;
3806                 }
3807                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3808                 goto qdir_exit;
3809         }
3810
3811         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3812                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3813                                info_buf_size);
3814         if (rc)
3815                 goto qdir_exit;
3816
3817         srch_inf->unicode = true;
3818
3819         if (srch_inf->ntwrk_buf_start) {
3820                 if (srch_inf->smallBuf)
3821                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3822                 else
3823                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3824         }
3825         srch_inf->ntwrk_buf_start = (char *)rsp;
3826         srch_inf->srch_entries_start = srch_inf->last_entry =
3827                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3828         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3829         srch_inf->entries_in_buffer =
3830                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3831                                     &srch_inf->last_entry, info_buf_size);
3832         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3833         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3834                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3835                  srch_inf->srch_entries_start, srch_inf->last_entry);
3836         if (resp_buftype == CIFS_LARGE_BUFFER)
3837                 srch_inf->smallBuf = false;
3838         else if (resp_buftype == CIFS_SMALL_BUFFER)
3839                 srch_inf->smallBuf = true;
3840         else
3841                 cifs_dbg(VFS, "illegal search buffer type\n");
3842
3843         return rc;
3844
3845 qdir_exit:
3846         free_rsp_buf(resp_buftype, rsp);
3847         return rc;
3848 }
3849
3850 int
3851 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3852                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3853                u8 info_type, u32 additional_info,
3854                 void **data, unsigned int *size)
3855 {
3856         struct smb2_set_info_req *req;
3857         struct kvec *iov = rqst->rq_iov;
3858         unsigned int i, total_len;
3859         int rc;
3860
3861         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3862         if (rc)
3863                 return rc;
3864
3865         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3866         req->InfoType = info_type;
3867         req->FileInfoClass = info_class;
3868         req->PersistentFileId = persistent_fid;
3869         req->VolatileFileId = volatile_fid;
3870         req->AdditionalInformation = cpu_to_le32(additional_info);
3871
3872         req->BufferOffset =
3873                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3874         req->BufferLength = cpu_to_le32(*size);
3875
3876         memcpy(req->Buffer, *data, *size);
3877         total_len += *size;
3878
3879         iov[0].iov_base = (char *)req;
3880         /* 1 for Buffer */
3881         iov[0].iov_len = total_len - 1;
3882
3883         for (i = 1; i < rqst->rq_nvec; i++) {
3884                 le32_add_cpu(&req->BufferLength, size[i]);
3885                 iov[i].iov_base = (char *)data[i];
3886                 iov[i].iov_len = size[i];
3887         }
3888
3889         return 0;
3890 }
3891
3892 void
3893 SMB2_set_info_free(struct smb_rqst *rqst)
3894 {
3895         if (rqst && rqst->rq_iov)
3896                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3897 }
3898
3899 static int
3900 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3901                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3902                u8 info_type, u32 additional_info, unsigned int num,
3903                 void **data, unsigned int *size)
3904 {
3905         struct smb_rqst rqst;
3906         struct smb2_set_info_rsp *rsp = NULL;
3907         struct kvec *iov;
3908         struct kvec rsp_iov;
3909         int rc = 0;
3910         int resp_buftype;
3911         struct cifs_ses *ses = tcon->ses;
3912         int flags = 0;
3913
3914         if (!ses || !(ses->server))
3915                 return -EIO;
3916
3917         if (!num)
3918                 return -EINVAL;
3919
3920         if (smb3_encryption_required(tcon))
3921                 flags |= CIFS_TRANSFORM_REQ;
3922
3923         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3924         if (!iov)
3925                 return -ENOMEM;
3926
3927         memset(&rqst, 0, sizeof(struct smb_rqst));
3928         rqst.rq_iov = iov;
3929         rqst.rq_nvec = num;
3930
3931         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
3932                                 info_class, info_type, additional_info,
3933                                 data, size);
3934         if (rc) {
3935                 kfree(iov);
3936                 return rc;
3937         }
3938
3939
3940         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
3941                             &rsp_iov);
3942         SMB2_set_info_free(&rqst);
3943         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3944
3945         if (rc != 0) {
3946                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3947                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3948                                 ses->Suid, info_class, (__u32)info_type, rc);
3949         }
3950
3951         free_rsp_buf(resp_buftype, rsp);
3952         kfree(iov);
3953         return rc;
3954 }
3955
3956 int
3957 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3958              u64 volatile_fid, u32 pid, __le64 *eof)
3959 {
3960         struct smb2_file_eof_info info;
3961         void *data;
3962         unsigned int size;
3963
3964         info.EndOfFile = *eof;
3965
3966         data = &info;
3967         size = sizeof(struct smb2_file_eof_info);
3968
3969         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3970                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3971                         0, 1, &data, &size);
3972 }
3973
3974 int
3975 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3976                 u64 persistent_fid, u64 volatile_fid,
3977                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3978 {
3979         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3980                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3981                         1, (void **)&pnntsd, &pacllen);
3982 }
3983
3984 int
3985 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3986             u64 persistent_fid, u64 volatile_fid,
3987             struct smb2_file_full_ea_info *buf, int len)
3988 {
3989         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3990                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3991                 0, 1, (void **)&buf, &len);
3992 }
3993
3994 int
3995 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3996                   const u64 persistent_fid, const u64 volatile_fid,
3997                   __u8 oplock_level)
3998 {
3999         struct smb_rqst rqst;
4000         int rc;
4001         struct smb2_oplock_break *req = NULL;
4002         struct cifs_ses *ses = tcon->ses;
4003         int flags = CIFS_OBREAK_OP;
4004         unsigned int total_len;
4005         struct kvec iov[1];
4006         struct kvec rsp_iov;
4007         int resp_buf_type;
4008
4009         cifs_dbg(FYI, "SMB2_oplock_break\n");
4010         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4011                              &total_len);
4012         if (rc)
4013                 return rc;
4014
4015         if (smb3_encryption_required(tcon))
4016                 flags |= CIFS_TRANSFORM_REQ;
4017
4018         req->VolatileFid = volatile_fid;
4019         req->PersistentFid = persistent_fid;
4020         req->OplockLevel = oplock_level;
4021         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4022
4023         flags |= CIFS_NO_RESP;
4024
4025         iov[0].iov_base = (char *)req;
4026         iov[0].iov_len = total_len;
4027
4028         memset(&rqst, 0, sizeof(struct smb_rqst));
4029         rqst.rq_iov = iov;
4030         rqst.rq_nvec = 1;
4031
4032         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4033         cifs_small_buf_release(req);
4034
4035         if (rc) {
4036                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4037                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4038         }
4039
4040         return rc;
4041 }
4042
4043 void
4044 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4045                              struct kstatfs *kst)
4046 {
4047         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4048                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4049         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4050         kst->f_bfree  = kst->f_bavail =
4051                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4052         return;
4053 }
4054
4055 static void
4056 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4057                         struct kstatfs *kst)
4058 {
4059         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4060         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4061         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4062         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4063                 kst->f_bavail = kst->f_bfree;
4064         else
4065                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4066         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4067                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4068         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4069                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4070
4071         return;
4072 }
4073
4074 static int
4075 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4076                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4077 {
4078         int rc;
4079         struct smb2_query_info_req *req;
4080         unsigned int total_len;
4081
4082         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4083
4084         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4085                 return -EIO;
4086
4087         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4088                              &total_len);
4089         if (rc)
4090                 return rc;
4091
4092         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4093         req->FileInfoClass = level;
4094         req->PersistentFileId = persistent_fid;
4095         req->VolatileFileId = volatile_fid;
4096         /* 1 for pad */
4097         req->InputBufferOffset =
4098                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4099         req->OutputBufferLength = cpu_to_le32(
4100                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4101
4102         iov->iov_base = (char *)req;
4103         iov->iov_len = total_len;
4104         return 0;
4105 }
4106
4107 int
4108 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4109               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4110 {
4111         struct smb_rqst rqst;
4112         struct smb2_query_info_rsp *rsp = NULL;
4113         struct kvec iov;
4114         struct kvec rsp_iov;
4115         int rc = 0;
4116         int resp_buftype;
4117         struct cifs_ses *ses = tcon->ses;
4118         FILE_SYSTEM_POSIX_INFO *info = NULL;
4119         int flags = 0;
4120
4121         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4122                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4123                                 persistent_fid, volatile_fid);
4124         if (rc)
4125                 return rc;
4126
4127         if (smb3_encryption_required(tcon))
4128                 flags |= CIFS_TRANSFORM_REQ;
4129
4130         memset(&rqst, 0, sizeof(struct smb_rqst));
4131         rqst.rq_iov = &iov;
4132         rqst.rq_nvec = 1;
4133
4134         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4135         cifs_small_buf_release(iov.iov_base);
4136         if (rc) {
4137                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4138                 goto posix_qfsinf_exit;
4139         }
4140         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4141
4142         info = (FILE_SYSTEM_POSIX_INFO *)(
4143                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4144         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4145                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4146                                sizeof(FILE_SYSTEM_POSIX_INFO));
4147         if (!rc)
4148                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4149
4150 posix_qfsinf_exit:
4151         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4152         return rc;
4153 }
4154
4155 int
4156 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4157               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4158 {
4159         struct smb_rqst rqst;
4160         struct smb2_query_info_rsp *rsp = NULL;
4161         struct kvec iov;
4162         struct kvec rsp_iov;
4163         int rc = 0;
4164         int resp_buftype;
4165         struct cifs_ses *ses = tcon->ses;
4166         struct smb2_fs_full_size_info *info = NULL;
4167         int flags = 0;
4168
4169         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4170                                 sizeof(struct smb2_fs_full_size_info),
4171                                 persistent_fid, volatile_fid);
4172         if (rc)
4173                 return rc;
4174
4175         if (smb3_encryption_required(tcon))
4176                 flags |= CIFS_TRANSFORM_REQ;
4177
4178         memset(&rqst, 0, sizeof(struct smb_rqst));
4179         rqst.rq_iov = &iov;
4180         rqst.rq_nvec = 1;
4181
4182         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4183         cifs_small_buf_release(iov.iov_base);
4184         if (rc) {
4185                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4186                 goto qfsinf_exit;
4187         }
4188         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4189
4190         info = (struct smb2_fs_full_size_info *)(
4191                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4192         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4193                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4194                                sizeof(struct smb2_fs_full_size_info));
4195         if (!rc)
4196                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4197
4198 qfsinf_exit:
4199         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4200         return rc;
4201 }
4202
4203 int
4204 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4205               u64 persistent_fid, u64 volatile_fid, int level)
4206 {
4207         struct smb_rqst rqst;
4208         struct smb2_query_info_rsp *rsp = NULL;
4209         struct kvec iov;
4210         struct kvec rsp_iov;
4211         int rc = 0;
4212         int resp_buftype, max_len, min_len;
4213         struct cifs_ses *ses = tcon->ses;
4214         unsigned int rsp_len, offset;
4215         int flags = 0;
4216
4217         if (level == FS_DEVICE_INFORMATION) {
4218                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4219                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4220         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4221                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4222                 min_len = MIN_FS_ATTR_INFO_SIZE;
4223         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4224                 max_len = sizeof(struct smb3_fs_ss_info);
4225                 min_len = sizeof(struct smb3_fs_ss_info);
4226         } else if (level == FS_VOLUME_INFORMATION) {
4227                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4228                 min_len = sizeof(struct smb3_fs_vol_info);
4229         } else {
4230                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4231                 return -EINVAL;
4232         }
4233
4234         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4235                                 persistent_fid, volatile_fid);
4236         if (rc)
4237                 return rc;
4238
4239         if (smb3_encryption_required(tcon))
4240                 flags |= CIFS_TRANSFORM_REQ;
4241
4242         memset(&rqst, 0, sizeof(struct smb_rqst));
4243         rqst.rq_iov = &iov;
4244         rqst.rq_nvec = 1;
4245
4246         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4247         cifs_small_buf_release(iov.iov_base);
4248         if (rc) {
4249                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4250                 goto qfsattr_exit;
4251         }
4252         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4253
4254         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4255         offset = le16_to_cpu(rsp->OutputBufferOffset);
4256         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4257         if (rc)
4258                 goto qfsattr_exit;
4259
4260         if (level == FS_ATTRIBUTE_INFORMATION)
4261                 memcpy(&tcon->fsAttrInfo, offset
4262                         + (char *)rsp, min_t(unsigned int,
4263                         rsp_len, max_len));
4264         else if (level == FS_DEVICE_INFORMATION)
4265                 memcpy(&tcon->fsDevInfo, offset
4266                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4267         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4268                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4269                         (offset + (char *)rsp);
4270                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4271                 tcon->perf_sector_size =
4272                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4273         } else if (level == FS_VOLUME_INFORMATION) {
4274                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4275                         (offset + (char *)rsp);
4276                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4277                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4278         }
4279
4280 qfsattr_exit:
4281         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4282         return rc;
4283 }
4284
4285 int
4286 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4287            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4288            const __u32 num_lock, struct smb2_lock_element *buf)
4289 {
4290         struct smb_rqst rqst;
4291         int rc = 0;
4292         struct smb2_lock_req *req = NULL;
4293         struct kvec iov[2];
4294         struct kvec rsp_iov;
4295         int resp_buf_type;
4296         unsigned int count;
4297         int flags = CIFS_NO_RESP;
4298         unsigned int total_len;
4299
4300         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4301
4302         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4303         if (rc)
4304                 return rc;
4305
4306         if (smb3_encryption_required(tcon))
4307                 flags |= CIFS_TRANSFORM_REQ;
4308
4309         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4310         req->LockCount = cpu_to_le16(num_lock);
4311
4312         req->PersistentFileId = persist_fid;
4313         req->VolatileFileId = volatile_fid;
4314
4315         count = num_lock * sizeof(struct smb2_lock_element);
4316
4317         iov[0].iov_base = (char *)req;
4318         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4319         iov[1].iov_base = (char *)buf;
4320         iov[1].iov_len = count;
4321
4322         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4323
4324         memset(&rqst, 0, sizeof(struct smb_rqst));
4325         rqst.rq_iov = iov;
4326         rqst.rq_nvec = 2;
4327
4328         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4329                             &rsp_iov);
4330         cifs_small_buf_release(req);
4331         if (rc) {
4332                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4333                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4334                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4335                                     tcon->ses->Suid, rc);
4336         }
4337
4338         return rc;
4339 }
4340
4341 int
4342 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4343           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4344           const __u64 length, const __u64 offset, const __u32 lock_flags,
4345           const bool wait)
4346 {
4347         struct smb2_lock_element lock;
4348
4349         lock.Offset = cpu_to_le64(offset);
4350         lock.Length = cpu_to_le64(length);
4351         lock.Flags = cpu_to_le32(lock_flags);
4352         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4353                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4354
4355         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4356 }
4357
4358 int
4359 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4360                  __u8 *lease_key, const __le32 lease_state)
4361 {
4362         struct smb_rqst rqst;
4363         int rc;
4364         struct smb2_lease_ack *req = NULL;
4365         struct cifs_ses *ses = tcon->ses;
4366         int flags = CIFS_OBREAK_OP;
4367         unsigned int total_len;
4368         struct kvec iov[1];
4369         struct kvec rsp_iov;
4370         int resp_buf_type;
4371         __u64 *please_key_high;
4372         __u64 *please_key_low;
4373
4374         cifs_dbg(FYI, "SMB2_lease_break\n");
4375         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4376                              &total_len);
4377         if (rc)
4378                 return rc;
4379
4380         if (smb3_encryption_required(tcon))
4381                 flags |= CIFS_TRANSFORM_REQ;
4382
4383         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4384         req->StructureSize = cpu_to_le16(36);
4385         total_len += 12;
4386
4387         memcpy(req->LeaseKey, lease_key, 16);
4388         req->LeaseState = lease_state;
4389
4390         flags |= CIFS_NO_RESP;
4391
4392         iov[0].iov_base = (char *)req;
4393         iov[0].iov_len = total_len;
4394
4395         memset(&rqst, 0, sizeof(struct smb_rqst));
4396         rqst.rq_iov = iov;
4397         rqst.rq_nvec = 1;
4398
4399         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4400         cifs_small_buf_release(req);
4401
4402         please_key_low = (__u64 *)req->LeaseKey;
4403         please_key_high = (__u64 *)(req->LeaseKey+8);
4404         if (rc) {
4405                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4406                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4407                         ses->Suid, *please_key_low, *please_key_high, rc);
4408                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4409         } else
4410                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4411                         ses->Suid, *please_key_low, *please_key_high);
4412
4413         return rc;
4414 }