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 || !tcon->ses)
  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                   struct TCP_Server_Info *server)
 103 {
 104         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 105         shdr->StructureSize = cpu_to_le16(64);
 106         shdr->Command = smb2_cmd;
 107         if (server) {
 108                 spin_lock(&server->req_lock);
 109                 /* Request up to 10 credits but don't go over the limit. */
 110                 if (server->credits >= server->max_credits)
 111                         shdr->CreditRequest = cpu_to_le16(0);
 112                 else
 113                         shdr->CreditRequest = cpu_to_le16(
 114                                 min_t(int, server->max_credits -
 115                                                 server->credits, 10));
 116                 spin_unlock(&server->req_lock);
 117         } else {
 118                 shdr->CreditRequest = cpu_to_le16(2);
 119         }
 120         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 121
 122         if (!tcon)
 123                 goto out;
 124
 125         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 126         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 127         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 128                 shdr->CreditCharge = cpu_to_le16(1);
 129         /* else CreditCharge MBZ */
 130
 131         shdr->TreeId = tcon->tid;
 132         /* Uid is not converted */
 133         if (tcon->ses)
 134                 shdr->SessionId = tcon->ses->Suid;
 135
 136         /*
 137          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 138          * to pass the path on the Open SMB prefixed by \\server\share.
 139          * Not sure when we would need to do the augmented path (if ever) and
 140          * setting this flag breaks the SMB2 open operation since it is
 141          * illegal to send an empty path name (without \\server\share prefix)
 142          * when the DFS flag is set in the SMB open header. We could
 143          * consider setting the flag on all operations other than open
 144          * but it is safer to net set it for now.
 145          */
 146 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 147                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 148
 149         if (server && server->sign && !smb3_encryption_required(tcon))
 150                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 151 out:
 152         return;
 153 }
 154
 155 #ifdef CONFIG_CIFS_DFS_UPCALL
 156 static int __smb2_reconnect(const struct nls_table *nlsc,
 157                             struct cifs_tcon *tcon)
 158 {
 159         int rc;
 160         struct TCP_Server_Info *server = tcon->ses->server;
 161         struct dfs_cache_tgt_list tl;
 162         struct dfs_cache_tgt_iterator *it = NULL;
 163         char *tree;
 164         const char *tcp_host;
 165         size_t tcp_host_len;
 166         const char *dfs_host;
 167         size_t dfs_host_len;
 168
 169         tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
 170         if (!tree)
 171                 return -ENOMEM;
 172
 173         if (!tcon->dfs_path) {
 174                 if (tcon->ipc) {
 175                         scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
 176                                   server->hostname);
 177                         rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 178                 } else {
 179                         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon,
 180                                        nlsc);
 181                 }
 182                 goto out;
 183         }
 184
 185         rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
 186         if (rc)
 187                 goto out;
 188
 189         extract_unc_hostname(server->hostname, &tcp_host, &tcp_host_len);
 190
 191         for (it = dfs_cache_get_tgt_iterator(&tl); it;
 192              it = dfs_cache_get_next_tgt(&tl, it)) {
 193                 const char *share, *prefix;
 194                 size_t share_len, prefix_len;
 195                 bool target_match;
 196
 197                 rc = dfs_cache_get_tgt_share(it, &share, &share_len, &prefix,
 198                                              &prefix_len);
 199                 if (rc) {
 200                         cifs_dbg(VFS, "%s: failed to parse target share %d\n",
 201                                  __func__, rc);
 202                         continue;
 203                 }
 204
 205                 extract_unc_hostname(share, &dfs_host, &dfs_host_len);
 206
 207                 if (dfs_host_len != tcp_host_len
 208                     || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
 209                         cifs_dbg(FYI, "%s: %.*s doesn't match %.*s\n",
 210                                  __func__,
 211                                  (int)dfs_host_len, dfs_host,
 212                                  (int)tcp_host_len, tcp_host);
 213
 214                         rc = match_target_ip(server, dfs_host, dfs_host_len,
 215                                              &target_match);
 216                         if (rc) {
 217                                 cifs_dbg(VFS, "%s: failed to match target ip: %d\n",
 218                                          __func__, rc);
 219                                 break;
 220                         }
 221
 222                         if (!target_match) {
 223                                 cifs_dbg(FYI, "%s: skipping target\n", __func__);
 224                                 continue;
 225                         }
 226                 }
 227
 228                 if (tcon->ipc) {
 229                         scnprintf(tree, MAX_TREE_SIZE, "\\\\%.*s\\IPC$",
 230                                   (int)share_len, share);
 231                         rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 232                 } else {
 233                         scnprintf(tree, MAX_TREE_SIZE, "\\%.*s", (int)share_len,
 234                                   share);
 235                         rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 236                         if (!rc) {
 237                                 rc = update_super_prepath(tcon, prefix,
 238                                                           prefix_len);
 239                                 break;
 240                         }
 241                 }
 242                 if (rc == -EREMOTE)
 243                         break;
 244         }
 245
 246         if (!rc) {
 247                 if (it)
 248                         rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
 249                                                             it);
 250                 else
 251                         rc = -ENOENT;
 252         }
 253         dfs_cache_free_tgts(&tl);
 254 out:
 255         kfree(tree);
 256         return rc;
 257 }
 258 #else
 259 static inline int __smb2_reconnect(const struct nls_table *nlsc,
 260                                    struct cifs_tcon *tcon)
 261 {
 262         return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 263 }
 264 #endif
 265
 266 static int
 267 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 268                struct TCP_Server_Info *server)
 269 {
 270         int rc;
 271         struct nls_table *nls_codepage;
 272         struct cifs_ses *ses;
 273         int retries;
 274
 275         /*
 276          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 277          * check for tcp and smb session status done differently
 278          * for those three - in the calling routine.
 279          */
 280         if (tcon == NULL)
 281                 return 0;
 282
 283         if (smb2_command == SMB2_TREE_CONNECT)
 284                 return 0;
 285
 286         if (tcon->tidStatus == CifsExiting) {
 287                 /*
 288                  * only tree disconnect, open, and write,
 289                  * (and ulogoff which does not have tcon)
 290                  * are allowed as we start force umount.
 291                  */
 292                 if ((smb2_command != SMB2_WRITE) &&
 293                    (smb2_command != SMB2_CREATE) &&
 294                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 295                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 296                                  smb2_command);
 297                         return -ENODEV;
 298                 }
 299         }
 300         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 301             (!tcon->ses->server) || !server)
 302                 return -EIO;
 303
 304         ses = tcon->ses;
 305         retries = server->nr_targets;
 306
 307         /*
 308          * Give demultiplex thread up to 10 seconds to each target available for
 309          * reconnect -- should be greater than cifs socket timeout which is 7
 310          * seconds.
 311          */
 312         while (server->tcpStatus == CifsNeedReconnect) {
 313                 /*
 314                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 315                  * here since they are implicitly done when session drops.
 316                  */
 317                 switch (smb2_command) {
 318                 /*
 319                  * BB Should we keep oplock break and add flush to exceptions?
 320                  */
 321                 case SMB2_TREE_DISCONNECT:
 322                 case SMB2_CANCEL:
 323                 case SMB2_CLOSE:
 324                 case SMB2_OPLOCK_BREAK:
 325                         return -EAGAIN;
 326                 }
 327
 328                 rc = wait_event_interruptible_timeout(server->response_q,
 329                                                       (server->tcpStatus != CifsNeedReconnect),
 330                                                       10 * HZ);
 331                 if (rc < 0) {
 332                         cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
 333                                  __func__);
 334                         return -ERESTARTSYS;
 335                 }
 336
 337                 /* are we still trying to reconnect? */
 338                 if (server->tcpStatus != CifsNeedReconnect)
 339                         break;
 340
 341                 if (retries && --retries)
 342                         continue;
 343
 344                 /*
 345                  * on "soft" mounts we wait once. Hard mounts keep
 346                  * retrying until process is killed or server comes
 347                  * back on-line
 348                  */
 349                 if (!tcon->retry) {
 350                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 351                         return -EHOSTDOWN;
 352                 }
 353                 retries = server->nr_targets;
 354         }
 355
 356         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 357                 return 0;
 358
 359         nls_codepage = load_nls_default();
 360
 361         /*
 362          * need to prevent multiple threads trying to simultaneously reconnect
 363          * the same SMB session
 364          */
 365         mutex_lock(&tcon->ses->session_mutex);
 366
 367         /*
 368          * Recheck after acquire mutex. If another thread is negotiating
 369          * and the server never sends an answer the socket will be closed
 370          * and tcpStatus set to reconnect.
 371          */
 372         if (server->tcpStatus == CifsNeedReconnect) {
 373                 rc = -EHOSTDOWN;
 374                 mutex_unlock(&tcon->ses->session_mutex);
 375                 goto out;
 376         }
 377
 378         /*
 379          * If we are reconnecting an extra channel, bind
 380          */
 381         if (server->is_channel) {
 382                 ses->binding = true;
 383                 ses->binding_chan = cifs_ses_find_chan(ses, server);
 384         }
 385
 386         rc = cifs_negotiate_protocol(0, tcon->ses);
 387         if (!rc && tcon->ses->need_reconnect) {
 388                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 389                 if ((rc == -EACCES) && !tcon->retry) {
 390                         rc = -EHOSTDOWN;
 391                         ses->binding = false;
 392                         ses->binding_chan = NULL;
 393                         mutex_unlock(&tcon->ses->session_mutex);
 394                         goto failed;
 395                 }
 396         }
 397         /*
 398          * End of channel binding
 399          */
 400         ses->binding = false;
 401         ses->binding_chan = NULL;
 402
 403         if (rc || !tcon->need_reconnect) {
 404                 mutex_unlock(&tcon->ses->session_mutex);
 405                 goto out;
 406         }
 407
 408         cifs_mark_open_files_invalid(tcon);
 409         if (tcon->use_persistent)
 410                 tcon->need_reopen_files = true;
 411
 412         rc = __smb2_reconnect(nls_codepage, tcon);
 413         mutex_unlock(&tcon->ses->session_mutex);
 414
 415         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 416         if (rc) {
 417                 /* If sess reconnected but tcon didn't, something strange ... */
 418                 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
 419                 goto out;
 420         }
 421
 422         if (smb2_command != SMB2_INTERNAL_CMD)
 423                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 424
 425         atomic_inc(&tconInfoReconnectCount);
 426 out:
 427         /*
 428          * Check if handle based operation so we know whether we can continue
 429          * or not without returning to caller to reset file handle.
 430          */
 431         /*
 432          * BB Is flush done by server on drop of tcp session? Should we special
 433          * case it and skip above?
 434          */
 435         switch (smb2_command) {
 436         case SMB2_FLUSH:
 437         case SMB2_READ:
 438         case SMB2_WRITE:
 439         case SMB2_LOCK:
 440         case SMB2_IOCTL:
 441         case SMB2_QUERY_DIRECTORY:
 442         case SMB2_CHANGE_NOTIFY:
 443         case SMB2_QUERY_INFO:
 444         case SMB2_SET_INFO:
 445                 rc = -EAGAIN;
 446         }
 447 failed:
 448         unload_nls(nls_codepage);
 449         return rc;
 450 }
 451
 452 static void
 453 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 454                struct TCP_Server_Info *server,
 455                void *buf,
 456                unsigned int *total_len)
 457 {
 458         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 459         /* lookup word count ie StructureSize from table */
 460         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 461
 462         /*
 463          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 464          * largest operations (Create)
 465          */
 466         memset(buf, 0, 256);
 467
 468         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
 469         spdu->StructureSize2 = cpu_to_le16(parmsize);
 470
 471         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 472 }
 473
 474 /*
 475  * Allocate and return pointer to an SMB request hdr, and set basic
 476  * SMB information in the SMB header. If the return code is zero, this
 477  * function must have filled in request_buf pointer.
 478  */
 479 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 480                                  struct TCP_Server_Info *server,
 481                                  void **request_buf, unsigned int *total_len)
 482 {
 483         /* BB eventually switch this to SMB2 specific small buf size */
 484         if (smb2_command == SMB2_SET_INFO)
 485                 *request_buf = cifs_buf_get();
 486         else
 487                 *request_buf = cifs_small_buf_get();
 488         if (*request_buf == NULL) {
 489                 /* BB should we add a retry in here if not a writepage? */
 490                 return -ENOMEM;
 491         }
 492
 493         fill_small_buf(smb2_command, tcon, server,
 494                        (struct smb2_sync_hdr *)(*request_buf),
 495                        total_len);
 496
 497         if (tcon != NULL) {
 498                 uint16_t com_code = le16_to_cpu(smb2_command);
 499                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 500                 cifs_stats_inc(&tcon->num_smbs_sent);
 501         }
 502
 503         return 0;
 504 }
 505
 506 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 507                                struct TCP_Server_Info *server,
 508                                void **request_buf, unsigned int *total_len)
 509 {
 510         int rc;
 511
 512         rc = smb2_reconnect(smb2_command, tcon, server);
 513         if (rc)
 514                 return rc;
 515
 516         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 517                                      total_len);
 518 }
 519
 520 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 521                                struct TCP_Server_Info *server,
 522                                void **request_buf, unsigned int *total_len)
 523 {
 524         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 525         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 526                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 527                                              request_buf, total_len);
 528         }
 529         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 530                                    request_buf, total_len);
 531 }
 532
 533 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 534
 535 static void
 536 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 537 {
 538         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 539         pneg_ctxt->DataLength = cpu_to_le16(38);
 540         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 541         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 542         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 543         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 544 }
 545
 546 static void
 547 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 548 {
 549         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 550         pneg_ctxt->DataLength =
 551                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 552                           - sizeof(struct smb2_neg_context));
 553         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 554         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 555         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 556         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 557 }
 558
 559 static void
 560 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 561 {
 562         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 563         pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two ciphers */
 564         pneg_ctxt->CipherCount = cpu_to_le16(2);
 565         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 566         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 567 }
 568
 569 static unsigned int
 570 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 571 {
 572         struct nls_table *cp = load_nls_default();
 573
 574         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 575
 576         /* copy up to max of first 100 bytes of server name to NetName field */
 577         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 578         /* context size is DataLength + minimal smb2_neg_context */
 579         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 580                         sizeof(struct smb2_neg_context), 8) * 8;
 581 }
 582
 583 static void
 584 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 585 {
 586         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 587         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 588         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 589         pneg_ctxt->Name[0] = 0x93;
 590         pneg_ctxt->Name[1] = 0xAD;
 591         pneg_ctxt->Name[2] = 0x25;
 592         pneg_ctxt->Name[3] = 0x50;
 593         pneg_ctxt->Name[4] = 0x9C;
 594         pneg_ctxt->Name[5] = 0xB4;
 595         pneg_ctxt->Name[6] = 0x11;
 596         pneg_ctxt->Name[7] = 0xE7;
 597         pneg_ctxt->Name[8] = 0xB4;
 598         pneg_ctxt->Name[9] = 0x23;
 599         pneg_ctxt->Name[10] = 0x83;
 600         pneg_ctxt->Name[11] = 0xDE;
 601         pneg_ctxt->Name[12] = 0x96;
 602         pneg_ctxt->Name[13] = 0x8B;
 603         pneg_ctxt->Name[14] = 0xCD;
 604         pneg_ctxt->Name[15] = 0x7C;
 605 }
 606
 607 static void
 608 assemble_neg_contexts(struct smb2_negotiate_req *req,
 609                       struct TCP_Server_Info *server, unsigned int *total_len)
 610 {
 611         char *pneg_ctxt;
 612         unsigned int ctxt_len;
 613
 614         if (*total_len > 200) {
 615                 /* In case length corrupted don't want to overrun smb buffer */
 616                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 617                 return;
 618         }
 619
 620         /*
 621          * round up total_len of fixed part of SMB3 negotiate request to 8
 622          * byte boundary before adding negotiate contexts
 623          */
 624         *total_len = roundup(*total_len, 8);
 625
 626         pneg_ctxt = (*total_len) + (char *)req;
 627         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 628
 629         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 630         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 631         *total_len += ctxt_len;
 632         pneg_ctxt += ctxt_len;
 633
 634         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 635         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 636         *total_len += ctxt_len;
 637         pneg_ctxt += ctxt_len;
 638
 639         if (server->compress_algorithm) {
 640                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 641                                 pneg_ctxt);
 642                 ctxt_len = DIV_ROUND_UP(
 643                         sizeof(struct smb2_compression_capabilities_context),
 644                                 8) * 8;
 645                 *total_len += ctxt_len;
 646                 pneg_ctxt += ctxt_len;
 647                 req->NegotiateContextCount = cpu_to_le16(5);
 648         } else
 649                 req->NegotiateContextCount = cpu_to_le16(4);
 650
 651         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 652                                         server->hostname);
 653         *total_len += ctxt_len;
 654         pneg_ctxt += ctxt_len;
 655
 656         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 657         *total_len += sizeof(struct smb2_posix_neg_context);
 658 }
 659
 660 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 661 {
 662         unsigned int len = le16_to_cpu(ctxt->DataLength);
 663
 664         /* If invalid preauth context warn but use what we requested, SHA-512 */
 665         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 666                 pr_warn_once("server sent bad preauth context\n");
 667                 return;
 668         }
 669         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 670                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 671         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 672                 pr_warn_once("unknown SMB3 hash algorithm\n");
 673 }
 674
 675 static void decode_compress_ctx(struct TCP_Server_Info *server,
 676                          struct smb2_compression_capabilities_context *ctxt)
 677 {
 678         unsigned int len = le16_to_cpu(ctxt->DataLength);
 679
 680         /* sizeof compress context is a one element compression capbility struct */
 681         if (len < 10) {
 682                 pr_warn_once("server sent bad compression cntxt\n");
 683                 return;
 684         }
 685         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 686                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 687                 return;
 688         }
 689         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 690                 pr_warn_once("unknown compression algorithm\n");
 691                 return;
 692         }
 693         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 694 }
 695
 696 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 697                               struct smb2_encryption_neg_context *ctxt)
 698 {
 699         unsigned int len = le16_to_cpu(ctxt->DataLength);
 700
 701         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 702         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 703                 pr_warn_once("server sent bad crypto ctxt len\n");
 704                 return -EINVAL;
 705         }
 706
 707         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 708                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 709                 return -EINVAL;
 710         }
 711         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 712         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 713             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 714                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 715                 return -EINVAL;
 716         }
 717         server->cipher_type = ctxt->Ciphers[0];
 718         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 719         return 0;
 720 }
 721
 722 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 723                                      struct TCP_Server_Info *server,
 724                                      unsigned int len_of_smb)
 725 {
 726         struct smb2_neg_context *pctx;
 727         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 728         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 729         unsigned int len_of_ctxts, i;
 730         int rc = 0;
 731
 732         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 733         if (len_of_smb <= offset) {
 734                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 735                 return -EINVAL;
 736         }
 737
 738         len_of_ctxts = len_of_smb - offset;
 739
 740         for (i = 0; i < ctxt_cnt; i++) {
 741                 int clen;
 742                 /* check that offset is not beyond end of SMB */
 743                 if (len_of_ctxts == 0)
 744                         break;
 745
 746                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 747                         break;
 748
 749                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 750                 clen = le16_to_cpu(pctx->DataLength);
 751                 if (clen > len_of_ctxts)
 752                         break;
 753
 754                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 755                         decode_preauth_context(
 756                                 (struct smb2_preauth_neg_context *)pctx);
 757                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 758                         rc = decode_encrypt_ctx(server,
 759                                 (struct smb2_encryption_neg_context *)pctx);
 760                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 761                         decode_compress_ctx(server,
 762                                 (struct smb2_compression_capabilities_context *)pctx);
 763                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 764                         server->posix_ext_supported = true;
 765                 else
 766                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 767                                 le16_to_cpu(pctx->ContextType));
 768
 769                 if (rc)
 770                         break;
 771                 /* offsets must be 8 byte aligned */
 772                 clen = (clen + 7) & ~0x7;
 773                 offset += clen + sizeof(struct smb2_neg_context);
 774                 len_of_ctxts -= clen;
 775         }
 776         return rc;
 777 }
 778
 779 static struct create_posix *
 780 create_posix_buf(umode_t mode)
 781 {
 782         struct create_posix *buf;
 783
 784         buf = kzalloc(sizeof(struct create_posix),
 785                         GFP_KERNEL);
 786         if (!buf)
 787                 return NULL;
 788
 789         buf->ccontext.DataOffset =
 790                 cpu_to_le16(offsetof(struct create_posix, Mode));
 791         buf->ccontext.DataLength = cpu_to_le32(4);
 792         buf->ccontext.NameOffset =
 793                 cpu_to_le16(offsetof(struct create_posix, Name));
 794         buf->ccontext.NameLength = cpu_to_le16(16);
 795
 796         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 797         buf->Name[0] = 0x93;
 798         buf->Name[1] = 0xAD;
 799         buf->Name[2] = 0x25;
 800         buf->Name[3] = 0x50;
 801         buf->Name[4] = 0x9C;
 802         buf->Name[5] = 0xB4;
 803         buf->Name[6] = 0x11;
 804         buf->Name[7] = 0xE7;
 805         buf->Name[8] = 0xB4;
 806         buf->Name[9] = 0x23;
 807         buf->Name[10] = 0x83;
 808         buf->Name[11] = 0xDE;
 809         buf->Name[12] = 0x96;
 810         buf->Name[13] = 0x8B;
 811         buf->Name[14] = 0xCD;
 812         buf->Name[15] = 0x7C;
 813         buf->Mode = cpu_to_le32(mode);
 814         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 815         return buf;
 816 }
 817
 818 static int
 819 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 820 {
 821         struct smb2_create_req *req = iov[0].iov_base;
 822         unsigned int num = *num_iovec;
 823
 824         iov[num].iov_base = create_posix_buf(mode);
 825         if (mode == ACL_NO_MODE)
 826                 cifs_dbg(FYI, "Invalid mode\n");
 827         if (iov[num].iov_base == NULL)
 828                 return -ENOMEM;
 829         iov[num].iov_len = sizeof(struct create_posix);
 830         if (!req->CreateContextsOffset)
 831                 req->CreateContextsOffset = cpu_to_le32(
 832                                 sizeof(struct smb2_create_req) +
 833                                 iov[num - 1].iov_len);
 834         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 835         *num_iovec = num + 1;
 836         return 0;
 837 }
 838
 839
 840 /*
 841  *
 842  *      SMB2 Worker functions follow:
 843  *
 844  *      The general structure of the worker functions is:
 845  *      1) Call smb2_init (assembles SMB2 header)
 846  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 847  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 848  *      4) Decode SMB2 command specific fields in the fixed length area
 849  *      5) Decode variable length data area (if any for this SMB2 command type)
 850  *      6) Call free smb buffer
 851  *      7) return
 852  *
 853  */
 854
 855 int
 856 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 857 {
 858         struct smb_rqst rqst;
 859         struct smb2_negotiate_req *req;
 860         struct smb2_negotiate_rsp *rsp;
 861         struct kvec iov[1];
 862         struct kvec rsp_iov;
 863         int rc = 0;
 864         int resp_buftype;
 865         struct TCP_Server_Info *server = cifs_ses_server(ses);
 866         int blob_offset, blob_length;
 867         char *security_blob;
 868         int flags = CIFS_NEG_OP;
 869         unsigned int total_len;
 870
 871         cifs_dbg(FYI, "Negotiate protocol\n");
 872
 873         if (!server) {
 874                 WARN(1, "%s: server is NULL!\n", __func__);
 875                 return -EIO;
 876         }
 877
 878         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 879                                  (void **) &req, &total_len);
 880         if (rc)
 881                 return rc;
 882
 883         req->sync_hdr.SessionId = 0;
 884
 885         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 886         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 887
 888         if (strcmp(server->vals->version_string,
 889                    SMB3ANY_VERSION_STRING) == 0) {
 890                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 891                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 892                 req->DialectCount = cpu_to_le16(2);
 893                 total_len += 4;
 894         } else if (strcmp(server->vals->version_string,
 895                    SMBDEFAULT_VERSION_STRING) == 0) {
 896                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 897                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 898                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 899                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 900                 req->DialectCount = cpu_to_le16(4);
 901                 total_len += 8;
 902         } else {
 903                 /* otherwise send specific dialect */
 904                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 905                 req->DialectCount = cpu_to_le16(1);
 906                 total_len += 2;
 907         }
 908
 909         /* only one of SMB2 signing flags may be set in SMB2 request */
 910         if (ses->sign)
 911                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 912         else if (global_secflags & CIFSSEC_MAY_SIGN)
 913                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 914         else
 915                 req->SecurityMode = 0;
 916
 917         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 918
 919         /* ClientGUID must be zero for SMB2.02 dialect */
 920         if (server->vals->protocol_id == SMB20_PROT_ID)
 921                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 922         else {
 923                 memcpy(req->ClientGUID, server->client_guid,
 924                         SMB2_CLIENT_GUID_SIZE);
 925                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 926                     (strcmp(server->vals->version_string,
 927                      SMBDEFAULT_VERSION_STRING) == 0))
 928                         assemble_neg_contexts(req, server, &total_len);
 929         }
 930         iov[0].iov_base = (char *)req;
 931         iov[0].iov_len = total_len;
 932
 933         memset(&rqst, 0, sizeof(struct smb_rqst));
 934         rqst.rq_iov = iov;
 935         rqst.rq_nvec = 1;
 936
 937         rc = cifs_send_recv(xid, ses, server,
 938                             &rqst, &resp_buftype, flags, &rsp_iov);
 939         cifs_small_buf_release(req);
 940         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 941         /*
 942          * No tcon so can't do
 943          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 944          */
 945         if (rc == -EOPNOTSUPP) {
 946                 cifs_server_dbg(VFS, "Dialect not supported by server. Consider  specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n");
 947                 goto neg_exit;
 948         } else if (rc != 0)
 949                 goto neg_exit;
 950
 951         if (strcmp(server->vals->version_string,
 952                    SMB3ANY_VERSION_STRING) == 0) {
 953                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 954                         cifs_server_dbg(VFS,
 955                                 "SMB2 dialect returned but not requested\n");
 956                         return -EIO;
 957                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 958                         cifs_server_dbg(VFS,
 959                                 "SMB2.1 dialect returned but not requested\n");
 960                         return -EIO;
 961                 }
 962         } else if (strcmp(server->vals->version_string,
 963                    SMBDEFAULT_VERSION_STRING) == 0) {
 964                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 965                         cifs_server_dbg(VFS,
 966                                 "SMB2 dialect returned but not requested\n");
 967                         return -EIO;
 968                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 969                         /* ops set to 3.0 by default for default so update */
 970                         server->ops = &smb21_operations;
 971                         server->vals = &smb21_values;
 972                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 973                         server->ops = &smb311_operations;
 974                         server->vals = &smb311_values;
 975                 }
 976         } else if (le16_to_cpu(rsp->DialectRevision) !=
 977                                 server->vals->protocol_id) {
 978                 /* if requested single dialect ensure returned dialect matched */
 979                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 980                                 le16_to_cpu(rsp->DialectRevision));
 981                 return -EIO;
 982         }
 983
 984         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 985
 986         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 987                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 988         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 989                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 990         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 991                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 992         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 993                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 994         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 995                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 996         else {
 997                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
 998                                 le16_to_cpu(rsp->DialectRevision));
 999                 rc = -EIO;
1000                 goto neg_exit;
1001         }
1002         server->dialect = le16_to_cpu(rsp->DialectRevision);
1003
1004         /*
1005          * Keep a copy of the hash after negprot. This hash will be
1006          * the starting hash value for all sessions made from this
1007          * server.
1008          */
1009         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1010                SMB2_PREAUTH_HASH_SIZE);
1011
1012         /* SMB2 only has an extended negflavor */
1013         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1014         /* set it to the maximum buffer size value we can send with 1 credit */
1015         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1016                                SMB2_MAX_BUFFER_SIZE);
1017         server->max_read = le32_to_cpu(rsp->MaxReadSize);
1018         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1019         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1020         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1021                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1022                                 server->sec_mode);
1023         server->capabilities = le32_to_cpu(rsp->Capabilities);
1024         /* Internal types */
1025         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1026
1027         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1028                                                (struct smb2_sync_hdr *)rsp);
1029         /*
1030          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1031          * for us will be
1032          *      ses->sectype = RawNTLMSSP;
1033          * but for time being this is our only auth choice so doesn't matter.
1034          * We just found a server which sets blob length to zero expecting raw.
1035          */
1036         if (blob_length == 0) {
1037                 cifs_dbg(FYI, "missing security blob on negprot\n");
1038                 server->sec_ntlmssp = true;
1039         }
1040
1041         rc = cifs_enable_signing(server, ses->sign);
1042         if (rc)
1043                 goto neg_exit;
1044         if (blob_length) {
1045                 rc = decode_negTokenInit(security_blob, blob_length, server);
1046                 if (rc == 1)
1047                         rc = 0;
1048                 else if (rc == 0)
1049                         rc = -EIO;
1050         }
1051
1052         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1053                 if (rsp->NegotiateContextCount)
1054                         rc = smb311_decode_neg_context(rsp, server,
1055                                                        rsp_iov.iov_len);
1056                 else
1057                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1058         }
1059 neg_exit:
1060         free_rsp_buf(resp_buftype, rsp);
1061         return rc;
1062 }
1063
1064 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1065 {
1066         int rc;
1067         struct validate_negotiate_info_req *pneg_inbuf;
1068         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1069         u32 rsplen;
1070         u32 inbuflen; /* max of 4 dialects */
1071         struct TCP_Server_Info *server = tcon->ses->server;
1072
1073         cifs_dbg(FYI, "validate negotiate\n");
1074
1075         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1076         if (server->dialect == SMB311_PROT_ID)
1077                 return 0;
1078
1079         /*
1080          * validation ioctl must be signed, so no point sending this if we
1081          * can not sign it (ie are not known user).  Even if signing is not
1082          * required (enabled but not negotiated), in those cases we selectively
1083          * sign just this, the first and only signed request on a connection.
1084          * Having validation of negotiate info  helps reduce attack vectors.
1085          */
1086         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1087                 return 0; /* validation requires signing */
1088
1089         if (tcon->ses->user_name == NULL) {
1090                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1091                 return 0; /* validation requires signing */
1092         }
1093
1094         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1095                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1096
1097         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1098         if (!pneg_inbuf)
1099                 return -ENOMEM;
1100
1101         pneg_inbuf->Capabilities =
1102                         cpu_to_le32(server->vals->req_capabilities);
1103         memcpy(pneg_inbuf->Guid, server->client_guid,
1104                                         SMB2_CLIENT_GUID_SIZE);
1105
1106         if (tcon->ses->sign)
1107                 pneg_inbuf->SecurityMode =
1108                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1109         else if (global_secflags & CIFSSEC_MAY_SIGN)
1110                 pneg_inbuf->SecurityMode =
1111                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1112         else
1113                 pneg_inbuf->SecurityMode = 0;
1114
1115
1116         if (strcmp(server->vals->version_string,
1117                 SMB3ANY_VERSION_STRING) == 0) {
1118                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1119                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1120                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1121                 /* structure is big enough for 3 dialects, sending only 2 */
1122                 inbuflen = sizeof(*pneg_inbuf) -
1123                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1124         } else if (strcmp(server->vals->version_string,
1125                 SMBDEFAULT_VERSION_STRING) == 0) {
1126                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1127                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1128                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1129                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1130                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1131                 /* structure is big enough for 3 dialects */
1132                 inbuflen = sizeof(*pneg_inbuf);
1133         } else {
1134                 /* otherwise specific dialect was requested */
1135                 pneg_inbuf->Dialects[0] =
1136                         cpu_to_le16(server->vals->protocol_id);
1137                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1138                 /* structure is big enough for 3 dialects, sending only 1 */
1139                 inbuflen = sizeof(*pneg_inbuf) -
1140                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1141         }
1142
1143         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1144                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1145                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1146                 (char **)&pneg_rsp, &rsplen);
1147         if (rc == -EOPNOTSUPP) {
1148                 /*
1149                  * Old Windows versions or Netapp SMB server can return
1150                  * not supported error. Client should accept it.
1151                  */
1152                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1153                 rc = 0;
1154                 goto out_free_inbuf;
1155         } else if (rc != 0) {
1156                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1157                               rc);
1158                 rc = -EIO;
1159                 goto out_free_inbuf;
1160         }
1161
1162         rc = -EIO;
1163         if (rsplen != sizeof(*pneg_rsp)) {
1164                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1165                               rsplen);
1166
1167                 /* relax check since Mac returns max bufsize allowed on ioctl */
1168                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1169                         goto out_free_rsp;
1170         }
1171
1172         /* check validate negotiate info response matches what we got earlier */
1173         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1174                 goto vneg_out;
1175
1176         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1177                 goto vneg_out;
1178
1179         /* do not validate server guid because not saved at negprot time yet */
1180
1181         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1182               SMB2_LARGE_FILES) != server->capabilities)
1183                 goto vneg_out;
1184
1185         /* validate negotiate successful */
1186         rc = 0;
1187         cifs_dbg(FYI, "validate negotiate info successful\n");
1188         goto out_free_rsp;
1189
1190 vneg_out:
1191         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1192 out_free_rsp:
1193         kfree(pneg_rsp);
1194 out_free_inbuf:
1195         kfree(pneg_inbuf);
1196         return rc;
1197 }
1198
1199 enum securityEnum
1200 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1201 {
1202         switch (requested) {
1203         case Kerberos:
1204         case RawNTLMSSP:
1205                 return requested;
1206         case NTLMv2:
1207                 return RawNTLMSSP;
1208         case Unspecified:
1209                 if (server->sec_ntlmssp &&
1210                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1211                         return RawNTLMSSP;
1212                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1213                         (global_secflags & CIFSSEC_MAY_KRB5))
1214                         return Kerberos;
1215                 /* Fallthrough */
1216         default:
1217                 return Unspecified;
1218         }
1219 }
1220
1221 struct SMB2_sess_data {
1222         unsigned int xid;
1223         struct cifs_ses *ses;
1224         struct nls_table *nls_cp;
1225         void (*func)(struct SMB2_sess_data *);
1226         int result;
1227         u64 previous_session;
1228
1229         /* we will send the SMB in three pieces:
1230          * a fixed length beginning part, an optional
1231          * SPNEGO blob (which can be zero length), and a
1232          * last part which will include the strings
1233          * and rest of bcc area. This allows us to avoid
1234          * a large buffer 17K allocation
1235          */
1236         int buf0_type;
1237         struct kvec iov[2];
1238 };
1239
1240 static int
1241 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1242 {
1243         int rc;
1244         struct cifs_ses *ses = sess_data->ses;
1245         struct smb2_sess_setup_req *req;
1246         struct TCP_Server_Info *server = cifs_ses_server(ses);
1247         unsigned int total_len;
1248
1249         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1250                                  (void **) &req,
1251                                  &total_len);
1252         if (rc)
1253                 return rc;
1254
1255         if (sess_data->ses->binding) {
1256                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1257                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1258                 req->PreviousSessionId = 0;
1259                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1260         } else {
1261                 /* First session, not a reauthenticate */
1262                 req->sync_hdr.SessionId = 0;
1263                 /*
1264                  * if reconnect, we need to send previous sess id
1265                  * otherwise it is 0
1266                  */
1267                 req->PreviousSessionId = sess_data->previous_session;
1268                 req->Flags = 0; /* MBZ */
1269         }
1270
1271         /* enough to enable echos and oplocks and one max size write */
1272         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1273
1274         /* only one of SMB2 signing flags may be set in SMB2 request */
1275         if (server->sign)
1276                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1277         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1278                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1279         else
1280                 req->SecurityMode = 0;
1281
1282 #ifdef CONFIG_CIFS_DFS_UPCALL
1283         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1284 #else
1285         req->Capabilities = 0;
1286 #endif /* DFS_UPCALL */
1287
1288         req->Channel = 0; /* MBZ */
1289
1290         sess_data->iov[0].iov_base = (char *)req;
1291         /* 1 for pad */
1292         sess_data->iov[0].iov_len = total_len - 1;
1293         /*
1294          * This variable will be used to clear the buffer
1295          * allocated above in case of any error in the calling function.
1296          */
1297         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1298
1299         return 0;
1300 }
1301
1302 static void
1303 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1304 {
1305         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1306         sess_data->buf0_type = CIFS_NO_BUFFER;
1307 }
1308
1309 static int
1310 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1311 {
1312         int rc;
1313         struct smb_rqst rqst;
1314         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1315         struct kvec rsp_iov = { NULL, 0 };
1316
1317         /* Testing shows that buffer offset must be at location of Buffer[0] */
1318         req->SecurityBufferOffset =
1319                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1320         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1321
1322         memset(&rqst, 0, sizeof(struct smb_rqst));
1323         rqst.rq_iov = sess_data->iov;
1324         rqst.rq_nvec = 2;
1325
1326         /* BB add code to build os and lm fields */
1327         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1328                             cifs_ses_server(sess_data->ses),
1329                             &rqst,
1330                             &sess_data->buf0_type,
1331                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1332         cifs_small_buf_release(sess_data->iov[0].iov_base);
1333         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1334
1335         return rc;
1336 }
1337
1338 static int
1339 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1340 {
1341         int rc = 0;
1342         struct cifs_ses *ses = sess_data->ses;
1343         struct TCP_Server_Info *server = cifs_ses_server(ses);
1344
1345         mutex_lock(&server->srv_mutex);
1346         if (server->ops->generate_signingkey) {
1347                 rc = server->ops->generate_signingkey(ses);
1348                 if (rc) {
1349                         cifs_dbg(FYI,
1350                                 "SMB3 session key generation failed\n");
1351                         mutex_unlock(&server->srv_mutex);
1352                         return rc;
1353                 }
1354         }
1355         if (!server->session_estab) {
1356                 server->sequence_number = 0x2;
1357                 server->session_estab = true;
1358         }
1359         mutex_unlock(&server->srv_mutex);
1360
1361         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1362         /* keep existing ses state if binding */
1363         if (!ses->binding) {
1364                 spin_lock(&GlobalMid_Lock);
1365                 ses->status = CifsGood;
1366                 ses->need_reconnect = false;
1367                 spin_unlock(&GlobalMid_Lock);
1368         }
1369
1370         return rc;
1371 }
1372
1373 #ifdef CONFIG_CIFS_UPCALL
1374 static void
1375 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1376 {
1377         int rc;
1378         struct cifs_ses *ses = sess_data->ses;
1379         struct cifs_spnego_msg *msg;
1380         struct key *spnego_key = NULL;
1381         struct smb2_sess_setup_rsp *rsp = NULL;
1382
1383         rc = SMB2_sess_alloc_buffer(sess_data);
1384         if (rc)
1385                 goto out;
1386
1387         spnego_key = cifs_get_spnego_key(ses);
1388         if (IS_ERR(spnego_key)) {
1389                 rc = PTR_ERR(spnego_key);
1390                 spnego_key = NULL;
1391                 goto out;
1392         }
1393
1394         msg = spnego_key->payload.data[0];
1395         /*
1396          * check version field to make sure that cifs.upcall is
1397          * sending us a response in an expected form
1398          */
1399         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1400                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1401                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1402                 rc = -EKEYREJECTED;
1403                 goto out_put_spnego_key;
1404         }
1405
1406         /* keep session key if binding */
1407         if (!ses->binding) {
1408                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1409                                                  GFP_KERNEL);
1410                 if (!ses->auth_key.response) {
1411                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1412                                  msg->sesskey_len);
1413                         rc = -ENOMEM;
1414                         goto out_put_spnego_key;
1415                 }
1416                 ses->auth_key.len = msg->sesskey_len;
1417         }
1418
1419         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1420         sess_data->iov[1].iov_len = msg->secblob_len;
1421
1422         rc = SMB2_sess_sendreceive(sess_data);
1423         if (rc)
1424                 goto out_put_spnego_key;
1425
1426         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1427         /* keep session id and flags if binding */
1428         if (!ses->binding) {
1429                 ses->Suid = rsp->sync_hdr.SessionId;
1430                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1431         }
1432
1433         rc = SMB2_sess_establish_session(sess_data);
1434 out_put_spnego_key:
1435         key_invalidate(spnego_key);
1436         key_put(spnego_key);
1437 out:
1438         sess_data->result = rc;
1439         sess_data->func = NULL;
1440         SMB2_sess_free_buffer(sess_data);
1441 }
1442 #else
1443 static void
1444 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1445 {
1446         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1447         sess_data->result = -EOPNOTSUPP;
1448         sess_data->func = NULL;
1449 }
1450 #endif
1451
1452 static void
1453 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1454
1455 static void
1456 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1457 {
1458         int rc;
1459         struct cifs_ses *ses = sess_data->ses;
1460         struct smb2_sess_setup_rsp *rsp = NULL;
1461         char *ntlmssp_blob = NULL;
1462         bool use_spnego = false; /* else use raw ntlmssp */
1463         u16 blob_length = 0;
1464
1465         /*
1466          * If memory allocation is successful, caller of this function
1467          * frees it.
1468          */
1469         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1470         if (!ses->ntlmssp) {
1471                 rc = -ENOMEM;
1472                 goto out_err;
1473         }
1474         ses->ntlmssp->sesskey_per_smbsess = true;
1475
1476         rc = SMB2_sess_alloc_buffer(sess_data);
1477         if (rc)
1478                 goto out_err;
1479
1480         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1481                                GFP_KERNEL);
1482         if (ntlmssp_blob == NULL) {
1483                 rc = -ENOMEM;
1484                 goto out;
1485         }
1486
1487         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1488         if (use_spnego) {
1489                 /* BB eventually need to add this */
1490                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1491                 rc = -EOPNOTSUPP;
1492                 goto out;
1493         } else {
1494                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1495                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1496         }
1497         sess_data->iov[1].iov_base = ntlmssp_blob;
1498         sess_data->iov[1].iov_len = blob_length;
1499
1500         rc = SMB2_sess_sendreceive(sess_data);
1501         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1502
1503         /* If true, rc here is expected and not an error */
1504         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1505                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1506                 rc = 0;
1507
1508         if (rc)
1509                 goto out;
1510
1511         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1512                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1513                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1514                         le16_to_cpu(rsp->SecurityBufferOffset));
1515                 rc = -EIO;
1516                 goto out;
1517         }
1518         rc = decode_ntlmssp_challenge(rsp->Buffer,
1519                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1520         if (rc)
1521                 goto out;
1522
1523         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1524
1525         /* keep existing ses id and flags if binding */
1526         if (!ses->binding) {
1527                 ses->Suid = rsp->sync_hdr.SessionId;
1528                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1529         }
1530
1531 out:
1532         kfree(ntlmssp_blob);
1533         SMB2_sess_free_buffer(sess_data);
1534         if (!rc) {
1535                 sess_data->result = 0;
1536                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1537                 return;
1538         }
1539 out_err:
1540         kfree(ses->ntlmssp);
1541         ses->ntlmssp = NULL;
1542         sess_data->result = rc;
1543         sess_data->func = NULL;
1544 }
1545
1546 static void
1547 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1548 {
1549         int rc;
1550         struct cifs_ses *ses = sess_data->ses;
1551         struct smb2_sess_setup_req *req;
1552         struct smb2_sess_setup_rsp *rsp = NULL;
1553         unsigned char *ntlmssp_blob = NULL;
1554         bool use_spnego = false; /* else use raw ntlmssp */
1555         u16 blob_length = 0;
1556
1557         rc = SMB2_sess_alloc_buffer(sess_data);
1558         if (rc)
1559                 goto out;
1560
1561         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1562         req->sync_hdr.SessionId = ses->Suid;
1563
1564         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1565                                         sess_data->nls_cp);
1566         if (rc) {
1567                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1568                 goto out;
1569         }
1570
1571         if (use_spnego) {
1572                 /* BB eventually need to add this */
1573                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1574                 rc = -EOPNOTSUPP;
1575                 goto out;
1576         }
1577         sess_data->iov[1].iov_base = ntlmssp_blob;
1578         sess_data->iov[1].iov_len = blob_length;
1579
1580         rc = SMB2_sess_sendreceive(sess_data);
1581         if (rc)
1582                 goto out;
1583
1584         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1585
1586         /* keep existing ses id and flags if binding */
1587         if (!ses->binding) {
1588                 ses->Suid = rsp->sync_hdr.SessionId;
1589                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1590         }
1591
1592         rc = SMB2_sess_establish_session(sess_data);
1593 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1594         if (ses->server->dialect < SMB30_PROT_ID) {
1595                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1596                 /*
1597                  * The session id is opaque in terms of endianness, so we can't
1598                  * print it as a long long. we dump it as we got it on the wire
1599                  */
1600                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1601                          &ses->Suid);
1602                 cifs_dbg(VFS, "Session Key   %*ph\n",
1603                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1604                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1605                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1606         }
1607 #endif
1608 out:
1609         kfree(ntlmssp_blob);
1610         SMB2_sess_free_buffer(sess_data);
1611         kfree(ses->ntlmssp);
1612         ses->ntlmssp = NULL;
1613         sess_data->result = rc;
1614         sess_data->func = NULL;
1615 }
1616
1617 static int
1618 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1619 {
1620         int type;
1621
1622         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1623         cifs_dbg(FYI, "sess setup type %d\n", type);
1624         if (type == Unspecified) {
1625                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1626                 return -EINVAL;
1627         }
1628
1629         switch (type) {
1630         case Kerberos:
1631                 sess_data->func = SMB2_auth_kerberos;
1632                 break;
1633         case RawNTLMSSP:
1634                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1635                 break;
1636         default:
1637                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1638                 return -EOPNOTSUPP;
1639         }
1640
1641         return 0;
1642 }
1643
1644 int
1645 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1646                 const struct nls_table *nls_cp)
1647 {
1648         int rc = 0;
1649         struct TCP_Server_Info *server = cifs_ses_server(ses);
1650         struct SMB2_sess_data *sess_data;
1651
1652         cifs_dbg(FYI, "Session Setup\n");
1653
1654         if (!server) {
1655                 WARN(1, "%s: server is NULL!\n", __func__);
1656                 return -EIO;
1657         }
1658
1659         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1660         if (!sess_data)
1661                 return -ENOMEM;
1662
1663         rc = SMB2_select_sec(ses, sess_data);
1664         if (rc)
1665                 goto out;
1666         sess_data->xid = xid;
1667         sess_data->ses = ses;
1668         sess_data->buf0_type = CIFS_NO_BUFFER;
1669         sess_data->nls_cp = (struct nls_table *) nls_cp;
1670         sess_data->previous_session = ses->Suid;
1671
1672         /*
1673          * Initialize the session hash with the server one.
1674          */
1675         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1676                SMB2_PREAUTH_HASH_SIZE);
1677
1678         while (sess_data->func)
1679                 sess_data->func(sess_data);
1680
1681         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1682                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1683         rc = sess_data->result;
1684 out:
1685         kfree(sess_data);
1686         return rc;
1687 }
1688
1689 int
1690 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1691 {
1692         struct smb_rqst rqst;
1693         struct smb2_logoff_req *req; /* response is also trivial struct */
1694         int rc = 0;
1695         struct TCP_Server_Info *server;
1696         int flags = 0;
1697         unsigned int total_len;
1698         struct kvec iov[1];
1699         struct kvec rsp_iov;
1700         int resp_buf_type;
1701
1702         cifs_dbg(FYI, "disconnect session %p\n", ses);
1703
1704         if (ses && (ses->server))
1705                 server = ses->server;
1706         else
1707                 return -EIO;
1708
1709         /* no need to send SMB logoff if uid already closed due to reconnect */
1710         if (ses->need_reconnect)
1711                 goto smb2_session_already_dead;
1712
1713         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1714                                  (void **) &req, &total_len);
1715         if (rc)
1716                 return rc;
1717
1718          /* since no tcon, smb2_init can not do this, so do here */
1719         req->sync_hdr.SessionId = ses->Suid;
1720
1721         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1722                 flags |= CIFS_TRANSFORM_REQ;
1723         else if (server->sign)
1724                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1725
1726         flags |= CIFS_NO_RSP_BUF;
1727
1728         iov[0].iov_base = (char *)req;
1729         iov[0].iov_len = total_len;
1730
1731         memset(&rqst, 0, sizeof(struct smb_rqst));
1732         rqst.rq_iov = iov;
1733         rqst.rq_nvec = 1;
1734
1735         rc = cifs_send_recv(xid, ses, ses->server,
1736                             &rqst, &resp_buf_type, flags, &rsp_iov);
1737         cifs_small_buf_release(req);
1738         /*
1739          * No tcon so can't do
1740          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1741          */
1742
1743 smb2_session_already_dead:
1744         return rc;
1745 }
1746
1747 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1748 {
1749         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1750 }
1751
1752 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1753
1754 /* These are similar values to what Windows uses */
1755 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1756 {
1757         tcon->max_chunks = 256;
1758         tcon->max_bytes_chunk = 1048576;
1759         tcon->max_bytes_copy = 16777216;
1760 }
1761
1762 int
1763 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1764           struct cifs_tcon *tcon, const struct nls_table *cp)
1765 {
1766         struct smb_rqst rqst;
1767         struct smb2_tree_connect_req *req;
1768         struct smb2_tree_connect_rsp *rsp = NULL;
1769         struct kvec iov[2];
1770         struct kvec rsp_iov = { NULL, 0 };
1771         int rc = 0;
1772         int resp_buftype;
1773         int unc_path_len;
1774         __le16 *unc_path = NULL;
1775         int flags = 0;
1776         unsigned int total_len;
1777         struct TCP_Server_Info *server;
1778
1779         /* always use master channel */
1780         server = ses->server;
1781
1782         cifs_dbg(FYI, "TCON\n");
1783
1784         if (!server || !tree)
1785                 return -EIO;
1786
1787         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1788         if (unc_path == NULL)
1789                 return -ENOMEM;
1790
1791         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1792         unc_path_len *= 2;
1793         if (unc_path_len < 2) {
1794                 kfree(unc_path);
1795                 return -EINVAL;
1796         }
1797
1798         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1799         tcon->tid = 0;
1800         atomic_set(&tcon->num_remote_opens, 0);
1801         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1802                                  (void **) &req, &total_len);
1803         if (rc) {
1804                 kfree(unc_path);
1805                 return rc;
1806         }
1807
1808         if (smb3_encryption_required(tcon))
1809                 flags |= CIFS_TRANSFORM_REQ;
1810
1811         iov[0].iov_base = (char *)req;
1812         /* 1 for pad */
1813         iov[0].iov_len = total_len - 1;
1814
1815         /* Testing shows that buffer offset must be at location of Buffer[0] */
1816         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1817                         - 1 /* pad */);
1818         req->PathLength = cpu_to_le16(unc_path_len - 2);
1819         iov[1].iov_base = unc_path;
1820         iov[1].iov_len = unc_path_len;
1821
1822         /*
1823          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1824          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1825          * (Samba servers don't always set the flag so also check if null user)
1826          */
1827         if ((server->dialect == SMB311_PROT_ID) &&
1828             !smb3_encryption_required(tcon) &&
1829             !(ses->session_flags &
1830                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1831             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1832                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1833
1834         memset(&rqst, 0, sizeof(struct smb_rqst));
1835         rqst.rq_iov = iov;
1836         rqst.rq_nvec = 2;
1837
1838         /* Need 64 for max size write so ask for more in case not there yet */
1839         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1840
1841         rc = cifs_send_recv(xid, ses, server,
1842                             &rqst, &resp_buftype, flags, &rsp_iov);
1843         cifs_small_buf_release(req);
1844         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1845         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1846         if (rc != 0) {
1847                 if (tcon) {
1848                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1849                         tcon->need_reconnect = true;
1850                 }
1851                 goto tcon_error_exit;
1852         }
1853
1854         switch (rsp->ShareType) {
1855         case SMB2_SHARE_TYPE_DISK:
1856                 cifs_dbg(FYI, "connection to disk share\n");
1857                 break;
1858         case SMB2_SHARE_TYPE_PIPE:
1859                 tcon->pipe = true;
1860                 cifs_dbg(FYI, "connection to pipe share\n");
1861                 break;
1862         case SMB2_SHARE_TYPE_PRINT:
1863                 tcon->print = true;
1864                 cifs_dbg(FYI, "connection to printer\n");
1865                 break;
1866         default:
1867                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1868                 rc = -EOPNOTSUPP;
1869                 goto tcon_error_exit;
1870         }
1871
1872         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1873         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1874         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1875         tcon->tidStatus = CifsGood;
1876         tcon->need_reconnect = false;
1877         tcon->tid = rsp->sync_hdr.TreeId;
1878         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1879
1880         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1881             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1882                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1883
1884         if (tcon->seal &&
1885             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1886                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1887
1888         init_copy_chunk_defaults(tcon);
1889         if (server->ops->validate_negotiate)
1890                 rc = server->ops->validate_negotiate(xid, tcon);
1891 tcon_exit:
1892
1893         free_rsp_buf(resp_buftype, rsp);
1894         kfree(unc_path);
1895         return rc;
1896
1897 tcon_error_exit:
1898         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1899                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1900         }
1901         goto tcon_exit;
1902 }
1903
1904 int
1905 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1906 {
1907         struct smb_rqst rqst;
1908         struct smb2_tree_disconnect_req *req; /* response is trivial */
1909         int rc = 0;
1910         struct cifs_ses *ses = tcon->ses;
1911         int flags = 0;
1912         unsigned int total_len;
1913         struct kvec iov[1];
1914         struct kvec rsp_iov;
1915         int resp_buf_type;
1916
1917         cifs_dbg(FYI, "Tree Disconnect\n");
1918
1919         if (!ses || !(ses->server))
1920                 return -EIO;
1921
1922         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1923                 return 0;
1924
1925         close_shroot_lease(&tcon->crfid);
1926
1927         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1928                                  (void **) &req,
1929                                  &total_len);
1930         if (rc)
1931                 return rc;
1932
1933         if (smb3_encryption_required(tcon))
1934                 flags |= CIFS_TRANSFORM_REQ;
1935
1936         flags |= CIFS_NO_RSP_BUF;
1937
1938         iov[0].iov_base = (char *)req;
1939         iov[0].iov_len = total_len;
1940
1941         memset(&rqst, 0, sizeof(struct smb_rqst));
1942         rqst.rq_iov = iov;
1943         rqst.rq_nvec = 1;
1944
1945         rc = cifs_send_recv(xid, ses, ses->server,
1946                             &rqst, &resp_buf_type, flags, &rsp_iov);
1947         cifs_small_buf_release(req);
1948         if (rc)
1949                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1950
1951         return rc;
1952 }
1953
1954
1955 static struct create_durable *
1956 create_durable_buf(void)
1957 {
1958         struct create_durable *buf;
1959
1960         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1961         if (!buf)
1962                 return NULL;
1963
1964         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1965                                         (struct create_durable, Data));
1966         buf->ccontext.DataLength = cpu_to_le32(16);
1967         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1968                                 (struct create_durable, Name));
1969         buf->ccontext.NameLength = cpu_to_le16(4);
1970         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1971         buf->Name[0] = 'D';
1972         buf->Name[1] = 'H';
1973         buf->Name[2] = 'n';
1974         buf->Name[3] = 'Q';
1975         return buf;
1976 }
1977
1978 static struct create_durable *
1979 create_reconnect_durable_buf(struct cifs_fid *fid)
1980 {
1981         struct create_durable *buf;
1982
1983         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1984         if (!buf)
1985                 return NULL;
1986
1987         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1988                                         (struct create_durable, Data));
1989         buf->ccontext.DataLength = cpu_to_le32(16);
1990         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1991                                 (struct create_durable, Name));
1992         buf->ccontext.NameLength = cpu_to_le16(4);
1993         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1994         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1995         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1996         buf->Name[0] = 'D';
1997         buf->Name[1] = 'H';
1998         buf->Name[2] = 'n';
1999         buf->Name[3] = 'C';
2000         return buf;
2001 }
2002
2003 static void
2004 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2005 {
2006         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
2007
2008         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2009                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2010         buf->IndexNumber = pdisk_id->DiskFileId;
2011 }
2012
2013 static void
2014 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2015                  struct create_posix_rsp *posix)
2016 {
2017         int sid_len;
2018         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2019         u8 *end = beg + le32_to_cpu(cc->DataLength);
2020         u8 *sid;
2021
2022         memset(posix, 0, sizeof(*posix));
2023
2024         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2025         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2026         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2027
2028         sid = beg + 12;
2029         sid_len = posix_info_sid_size(sid, end);
2030         if (sid_len < 0) {
2031                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2032                 return;
2033         }
2034         memcpy(&posix->owner, sid, sid_len);
2035
2036         sid = sid + sid_len;
2037         sid_len = posix_info_sid_size(sid, end);
2038         if (sid_len < 0) {
2039                 cifs_dbg(VFS, "bad group sid in posix create response\n");
2040                 return;
2041         }
2042         memcpy(&posix->group, sid, sid_len);
2043
2044         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2045                  posix->nlink, posix->mode, posix->reparse_tag);
2046 }
2047
2048 void
2049 smb2_parse_contexts(struct TCP_Server_Info *server,
2050                     struct smb2_create_rsp *rsp,
2051                     unsigned int *epoch, char *lease_key, __u8 *oplock,
2052                     struct smb2_file_all_info *buf,
2053                     struct create_posix_rsp *posix)
2054 {
2055         char *data_offset;
2056         struct create_context *cc;
2057         unsigned int next;
2058         unsigned int remaining;
2059         char *name;
2060         const char smb3_create_tag_posix[] = {0x93, 0xAD, 0x25, 0x50, 0x9C,
2061                                         0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2062                                         0xDE, 0x96, 0x8B, 0xCD, 0x7C};
2063
2064         *oplock = 0;
2065         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2066         remaining = le32_to_cpu(rsp->CreateContextsLength);
2067         cc = (struct create_context *)data_offset;
2068
2069         /* Initialize inode number to 0 in case no valid data in qfid context */
2070         if (buf)
2071                 buf->IndexNumber = 0;
2072
2073         while (remaining >= sizeof(struct create_context)) {
2074                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2075                 if (le16_to_cpu(cc->NameLength) == 4 &&
2076                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2077                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2078                                                            lease_key);
2079                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2080                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2081                         parse_query_id_ctxt(cc, buf);
2082                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2083                         if (posix &&
2084                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2085                                 parse_posix_ctxt(cc, buf, posix);
2086                 }
2087                 /* else {
2088                         cifs_dbg(FYI, "Context not matched with len %d\n",
2089                                 le16_to_cpu(cc->NameLength));
2090                         cifs_dump_mem("Cctxt name: ", name, 4);
2091                 } */
2092
2093                 next = le32_to_cpu(cc->Next);
2094                 if (!next)
2095                         break;
2096                 remaining -= next;
2097                 cc = (struct create_context *)((char *)cc + next);
2098         }
2099
2100         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2101                 *oplock = rsp->OplockLevel;
2102
2103         return;
2104 }
2105
2106 static int
2107 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2108                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2109 {
2110         struct smb2_create_req *req = iov[0].iov_base;
2111         unsigned int num = *num_iovec;
2112
2113         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2114         if (iov[num].iov_base == NULL)
2115                 return -ENOMEM;
2116         iov[num].iov_len = server->vals->create_lease_size;
2117         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2118         if (!req->CreateContextsOffset)
2119                 req->CreateContextsOffset = cpu_to_le32(
2120                                 sizeof(struct smb2_create_req) +
2121                                 iov[num - 1].iov_len);
2122         le32_add_cpu(&req->CreateContextsLength,
2123                      server->vals->create_lease_size);
2124         *num_iovec = num + 1;
2125         return 0;
2126 }
2127
2128 static struct create_durable_v2 *
2129 create_durable_v2_buf(struct cifs_open_parms *oparms)
2130 {
2131         struct cifs_fid *pfid = oparms->fid;
2132         struct create_durable_v2 *buf;
2133
2134         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2135         if (!buf)
2136                 return NULL;
2137
2138         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2139                                         (struct create_durable_v2, dcontext));
2140         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2141         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2142                                 (struct create_durable_v2, Name));
2143         buf->ccontext.NameLength = cpu_to_le16(4);
2144
2145         /*
2146          * NB: Handle timeout defaults to 0, which allows server to choose
2147          * (most servers default to 120 seconds) and most clients default to 0.
2148          * This can be overridden at mount ("handletimeout=") if the user wants
2149          * a different persistent (or resilient) handle timeout for all opens
2150          * opens on a particular SMB3 mount.
2151          */
2152         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2153         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2154         generate_random_uuid(buf->dcontext.CreateGuid);
2155         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2156
2157         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2158         buf->Name[0] = 'D';
2159         buf->Name[1] = 'H';
2160         buf->Name[2] = '2';
2161         buf->Name[3] = 'Q';
2162         return buf;
2163 }
2164
2165 static struct create_durable_handle_reconnect_v2 *
2166 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2167 {
2168         struct create_durable_handle_reconnect_v2 *buf;
2169
2170         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2171                         GFP_KERNEL);
2172         if (!buf)
2173                 return NULL;
2174
2175         buf->ccontext.DataOffset =
2176                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2177                                      dcontext));
2178         buf->ccontext.DataLength =
2179                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2180         buf->ccontext.NameOffset =
2181                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2182                             Name));
2183         buf->ccontext.NameLength = cpu_to_le16(4);
2184
2185         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2186         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2187         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2188         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2189
2190         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2191         buf->Name[0] = 'D';
2192         buf->Name[1] = 'H';
2193         buf->Name[2] = '2';
2194         buf->Name[3] = 'C';
2195         return buf;
2196 }
2197
2198 static int
2199 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2200                     struct cifs_open_parms *oparms)
2201 {
2202         struct smb2_create_req *req = iov[0].iov_base;
2203         unsigned int num = *num_iovec;
2204
2205         iov[num].iov_base = create_durable_v2_buf(oparms);
2206         if (iov[num].iov_base == NULL)
2207                 return -ENOMEM;
2208         iov[num].iov_len = sizeof(struct create_durable_v2);
2209         if (!req->CreateContextsOffset)
2210                 req->CreateContextsOffset =
2211                         cpu_to_le32(sizeof(struct smb2_create_req) +
2212                                                                 iov[1].iov_len);
2213         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2214         *num_iovec = num + 1;
2215         return 0;
2216 }
2217
2218 static int
2219 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2220                     struct cifs_open_parms *oparms)
2221 {
2222         struct smb2_create_req *req = iov[0].iov_base;
2223         unsigned int num = *num_iovec;
2224
2225         /* indicate that we don't need to relock the file */
2226         oparms->reconnect = false;
2227
2228         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2229         if (iov[num].iov_base == NULL)
2230                 return -ENOMEM;
2231         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2232         if (!req->CreateContextsOffset)
2233                 req->CreateContextsOffset =
2234                         cpu_to_le32(sizeof(struct smb2_create_req) +
2235                                                                 iov[1].iov_len);
2236         le32_add_cpu(&req->CreateContextsLength,
2237                         sizeof(struct create_durable_handle_reconnect_v2));
2238         *num_iovec = num + 1;
2239         return 0;
2240 }
2241
2242 static int
2243 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2244                     struct cifs_open_parms *oparms, bool use_persistent)
2245 {
2246         struct smb2_create_req *req = iov[0].iov_base;
2247         unsigned int num = *num_iovec;
2248
2249         if (use_persistent) {
2250                 if (oparms->reconnect)
2251                         return add_durable_reconnect_v2_context(iov, num_iovec,
2252                                                                 oparms);
2253                 else
2254                         return add_durable_v2_context(iov, num_iovec, oparms);
2255         }
2256
2257         if (oparms->reconnect) {
2258                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2259                 /* indicate that we don't need to relock the file */
2260                 oparms->reconnect = false;
2261         } else
2262                 iov[num].iov_base = create_durable_buf();
2263         if (iov[num].iov_base == NULL)
2264                 return -ENOMEM;
2265         iov[num].iov_len = sizeof(struct create_durable);
2266         if (!req->CreateContextsOffset)
2267                 req->CreateContextsOffset =
2268                         cpu_to_le32(sizeof(struct smb2_create_req) +
2269                                                                 iov[1].iov_len);
2270         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2271         *num_iovec = num + 1;
2272         return 0;
2273 }
2274
2275 /* See MS-SMB2 2.2.13.2.7 */
2276 static struct crt_twarp_ctxt *
2277 create_twarp_buf(__u64 timewarp)
2278 {
2279         struct crt_twarp_ctxt *buf;
2280
2281         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2282         if (!buf)
2283                 return NULL;
2284
2285         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2286                                         (struct crt_twarp_ctxt, Timestamp));
2287         buf->ccontext.DataLength = cpu_to_le32(8);
2288         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2289                                 (struct crt_twarp_ctxt, Name));
2290         buf->ccontext.NameLength = cpu_to_le16(4);
2291         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2292         buf->Name[0] = 'T';
2293         buf->Name[1] = 'W';
2294         buf->Name[2] = 'r';
2295         buf->Name[3] = 'p';
2296         buf->Timestamp = cpu_to_le64(timewarp);
2297         return buf;
2298 }
2299
2300 /* See MS-SMB2 2.2.13.2.7 */
2301 static int
2302 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2303 {
2304         struct smb2_create_req *req = iov[0].iov_base;
2305         unsigned int num = *num_iovec;
2306
2307         iov[num].iov_base = create_twarp_buf(timewarp);
2308         if (iov[num].iov_base == NULL)
2309                 return -ENOMEM;
2310         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2311         if (!req->CreateContextsOffset)
2312                 req->CreateContextsOffset = cpu_to_le32(
2313                                 sizeof(struct smb2_create_req) +
2314                                 iov[num - 1].iov_len);
2315         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2316         *num_iovec = num + 1;
2317         return 0;
2318 }
2319
2320 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2321 static struct crt_sd_ctxt *
2322 create_sd_buf(umode_t mode, unsigned int *len)
2323 {
2324         struct crt_sd_ctxt *buf;
2325         struct cifs_ace *pace;
2326         unsigned int sdlen, acelen;
2327
2328         *len = roundup(sizeof(struct crt_sd_ctxt) + sizeof(struct cifs_ace) * 2,
2329                         8);
2330         buf = kzalloc(*len, GFP_KERNEL);
2331         if (buf == NULL)
2332                 return buf;
2333
2334         sdlen = sizeof(struct smb3_sd) + sizeof(struct smb3_acl) +
2335                  2 * sizeof(struct cifs_ace);
2336
2337         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2338                                         (struct crt_sd_ctxt, sd));
2339         buf->ccontext.DataLength = cpu_to_le32(sdlen);
2340         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2341                                 (struct crt_sd_ctxt, Name));
2342         buf->ccontext.NameLength = cpu_to_le16(4);
2343         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2344         buf->Name[0] = 'S';
2345         buf->Name[1] = 'e';
2346         buf->Name[2] = 'c';
2347         buf->Name[3] = 'D';
2348         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2349         /*
2350          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2351          * and "DP" ie the DACL is present
2352          */
2353         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2354
2355         /* offset owner, group and Sbz1 and SACL are all zero */
2356         buf->sd.OffsetDacl = cpu_to_le32(sizeof(struct smb3_sd));
2357         buf->acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2358
2359         /* create one ACE to hold the mode embedded in reserved special SID */
2360         pace = (struct cifs_ace *)(sizeof(struct crt_sd_ctxt) + (char *)buf);
2361         acelen = setup_special_mode_ACE(pace, (__u64)mode);
2362         /* and one more ACE to allow access for authenticated users */
2363         pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) +
2364                 (char *)buf));
2365         acelen += setup_authusers_ACE(pace);
2366         buf->acl.AclSize = cpu_to_le16(sizeof(struct cifs_acl) + acelen);
2367         buf->acl.AceCount = cpu_to_le16(2);
2368         return buf;
2369 }
2370
2371 static int
2372 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
2373 {
2374         struct smb2_create_req *req = iov[0].iov_base;
2375         unsigned int num = *num_iovec;
2376         unsigned int len = 0;
2377
2378         iov[num].iov_base = create_sd_buf(mode, &len);
2379         if (iov[num].iov_base == NULL)
2380                 return -ENOMEM;
2381         iov[num].iov_len = len;
2382         if (!req->CreateContextsOffset)
2383                 req->CreateContextsOffset = cpu_to_le32(
2384                                 sizeof(struct smb2_create_req) +
2385                                 iov[num - 1].iov_len);
2386         le32_add_cpu(&req->CreateContextsLength, len);
2387         *num_iovec = num + 1;
2388         return 0;
2389 }
2390
2391 static struct crt_query_id_ctxt *
2392 create_query_id_buf(void)
2393 {
2394         struct crt_query_id_ctxt *buf;
2395
2396         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2397         if (!buf)
2398                 return NULL;
2399
2400         buf->ccontext.DataOffset = cpu_to_le16(0);
2401         buf->ccontext.DataLength = cpu_to_le32(0);
2402         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2403                                 (struct crt_query_id_ctxt, Name));
2404         buf->ccontext.NameLength = cpu_to_le16(4);
2405         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2406         buf->Name[0] = 'Q';
2407         buf->Name[1] = 'F';
2408         buf->Name[2] = 'i';
2409         buf->Name[3] = 'd';
2410         return buf;
2411 }
2412
2413 /* See MS-SMB2 2.2.13.2.9 */
2414 static int
2415 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2416 {
2417         struct smb2_create_req *req = iov[0].iov_base;
2418         unsigned int num = *num_iovec;
2419
2420         iov[num].iov_base = create_query_id_buf();
2421         if (iov[num].iov_base == NULL)
2422                 return -ENOMEM;
2423         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2424         if (!req->CreateContextsOffset)
2425                 req->CreateContextsOffset = cpu_to_le32(
2426                                 sizeof(struct smb2_create_req) +
2427                                 iov[num - 1].iov_len);
2428         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2429         *num_iovec = num + 1;
2430         return 0;
2431 }
2432
2433 static int
2434 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2435                             const char *treename, const __le16 *path)
2436 {
2437         int treename_len, path_len;
2438         struct nls_table *cp;
2439         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2440
2441         /*
2442          * skip leading "\\"
2443          */
2444         treename_len = strlen(treename);
2445         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2446                 return -EINVAL;
2447
2448         treename += 2;
2449         treename_len -= 2;
2450
2451         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2452
2453         /*
2454          * make room for one path separator between the treename and
2455          * path
2456          */
2457         *out_len = treename_len + 1 + path_len;
2458
2459         /*
2460          * final path needs to be null-terminated UTF16 with a
2461          * size aligned to 8
2462          */
2463
2464         *out_size = roundup((*out_len+1)*2, 8);
2465         *out_path = kzalloc(*out_size, GFP_KERNEL);
2466         if (!*out_path)
2467                 return -ENOMEM;
2468
2469         cp = load_nls_default();
2470         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2471         UniStrcat(*out_path, sep);
2472         UniStrcat(*out_path, path);
2473         unload_nls(cp);
2474
2475         return 0;
2476 }
2477
2478 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2479                                umode_t mode, struct cifs_tcon *tcon,
2480                                const char *full_path,
2481                                struct cifs_sb_info *cifs_sb)
2482 {
2483         struct smb_rqst rqst;
2484         struct smb2_create_req *req;
2485         struct smb2_create_rsp *rsp = NULL;
2486         struct cifs_ses *ses = tcon->ses;
2487         struct kvec iov[3]; /* make sure at least one for each open context */
2488         struct kvec rsp_iov = {NULL, 0};
2489         int resp_buftype;
2490         int uni_path_len;
2491         __le16 *copy_path = NULL;
2492         int copy_size;
2493         int rc = 0;
2494         unsigned int n_iov = 2;
2495         __u32 file_attributes = 0;
2496         char *pc_buf = NULL;
2497         int flags = 0;
2498         unsigned int total_len;
2499         __le16 *utf16_path = NULL;
2500         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2501
2502         cifs_dbg(FYI, "mkdir\n");
2503
2504         /* resource #1: path allocation */
2505         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2506         if (!utf16_path)
2507                 return -ENOMEM;
2508
2509         if (!ses || !server) {
2510                 rc = -EIO;
2511                 goto err_free_path;
2512         }
2513
2514         /* resource #2: request */
2515         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2516                                  (void **) &req, &total_len);
2517         if (rc)
2518                 goto err_free_path;
2519
2520
2521         if (smb3_encryption_required(tcon))
2522                 flags |= CIFS_TRANSFORM_REQ;
2523
2524         req->ImpersonationLevel = IL_IMPERSONATION;
2525         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2526         /* File attributes ignored on open (used in create though) */
2527         req->FileAttributes = cpu_to_le32(file_attributes);
2528         req->ShareAccess = FILE_SHARE_ALL_LE;
2529         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2530         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2531
2532         iov[0].iov_base = (char *)req;
2533         /* -1 since last byte is buf[0] which is sent below (path) */
2534         iov[0].iov_len = total_len - 1;
2535
2536         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2537
2538         /* [MS-SMB2] 2.2.13 NameOffset:
2539          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2540          * the SMB2 header, the file name includes a prefix that will
2541          * be processed during DFS name normalization as specified in
2542          * section 3.3.5.9. Otherwise, the file name is relative to
2543          * the share that is identified by the TreeId in the SMB2
2544          * header.
2545          */
2546         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2547                 int name_len;
2548
2549                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2550                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2551                                                  &name_len,
2552                                                  tcon->treeName, utf16_path);
2553                 if (rc)
2554                         goto err_free_req;
2555
2556                 req->NameLength = cpu_to_le16(name_len * 2);
2557                 uni_path_len = copy_size;
2558                 /* free before overwriting resource */
2559                 kfree(utf16_path);
2560                 utf16_path = copy_path;
2561         } else {
2562                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2563                 /* MUST set path len (NameLength) to 0 opening root of share */
2564                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2565                 if (uni_path_len % 8 != 0) {
2566                         copy_size = roundup(uni_path_len, 8);
2567                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2568                         if (!copy_path) {
2569                                 rc = -ENOMEM;
2570                                 goto err_free_req;
2571                         }
2572                         memcpy((char *)copy_path, (const char *)utf16_path,
2573                                uni_path_len);
2574                         uni_path_len = copy_size;
2575                         /* free before overwriting resource */
2576                         kfree(utf16_path);
2577                         utf16_path = copy_path;
2578                 }
2579         }
2580
2581         iov[1].iov_len = uni_path_len;
2582         iov[1].iov_base = utf16_path;
2583         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2584
2585         if (tcon->posix_extensions) {
2586                 /* resource #3: posix buf */
2587                 rc = add_posix_context(iov, &n_iov, mode);
2588                 if (rc)
2589                         goto err_free_req;
2590                 pc_buf = iov[n_iov-1].iov_base;
2591         }
2592
2593
2594         memset(&rqst, 0, sizeof(struct smb_rqst));
2595         rqst.rq_iov = iov;
2596         rqst.rq_nvec = n_iov;
2597
2598         /* no need to inc num_remote_opens because we close it just below */
2599         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2600                                     FILE_WRITE_ATTRIBUTES);
2601         /* resource #4: response buffer */
2602         rc = cifs_send_recv(xid, ses, server,
2603                             &rqst, &resp_buftype, flags, &rsp_iov);
2604         if (rc) {
2605                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2606                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2607                                            CREATE_NOT_FILE,
2608                                            FILE_WRITE_ATTRIBUTES, rc);
2609                 goto err_free_rsp_buf;
2610         }
2611
2612         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2613         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2614                                     ses->Suid, CREATE_NOT_FILE,
2615                                     FILE_WRITE_ATTRIBUTES);
2616
2617         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2618
2619         /* Eventually save off posix specific response info and timestaps */
2620
2621 err_free_rsp_buf:
2622         free_rsp_buf(resp_buftype, rsp);
2623         kfree(pc_buf);
2624 err_free_req:
2625         cifs_small_buf_release(req);
2626 err_free_path:
2627         kfree(utf16_path);
2628         return rc;
2629 }
2630
2631 int
2632 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2633                struct smb_rqst *rqst, __u8 *oplock,
2634                struct cifs_open_parms *oparms, __le16 *path)
2635 {
2636         struct smb2_create_req *req;
2637         unsigned int n_iov = 2;
2638         __u32 file_attributes = 0;
2639         int copy_size;
2640         int uni_path_len;
2641         unsigned int total_len;
2642         struct kvec *iov = rqst->rq_iov;
2643         __le16 *copy_path;
2644         int rc;
2645
2646         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2647                                  (void **) &req, &total_len);
2648         if (rc)
2649                 return rc;
2650
2651         iov[0].iov_base = (char *)req;
2652         /* -1 since last byte is buf[0] which is sent below (path) */
2653         iov[0].iov_len = total_len - 1;
2654
2655         if (oparms->create_options & CREATE_OPTION_READONLY)
2656                 file_attributes |= ATTR_READONLY;
2657         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2658                 file_attributes |= ATTR_SYSTEM;
2659
2660         req->ImpersonationLevel = IL_IMPERSONATION;
2661         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2662         /* File attributes ignored on open (used in create though) */
2663         req->FileAttributes = cpu_to_le32(file_attributes);
2664         req->ShareAccess = FILE_SHARE_ALL_LE;
2665
2666         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2667         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2668         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2669
2670         /* [MS-SMB2] 2.2.13 NameOffset:
2671          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2672          * the SMB2 header, the file name includes a prefix that will
2673          * be processed during DFS name normalization as specified in
2674          * section 3.3.5.9. Otherwise, the file name is relative to
2675          * the share that is identified by the TreeId in the SMB2
2676          * header.
2677          */
2678         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2679                 int name_len;
2680
2681                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2682                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2683                                                  &name_len,
2684                                                  tcon->treeName, path);
2685                 if (rc)
2686                         return rc;
2687                 req->NameLength = cpu_to_le16(name_len * 2);
2688                 uni_path_len = copy_size;
2689                 path = copy_path;
2690         } else {
2691                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2692                 /* MUST set path len (NameLength) to 0 opening root of share */
2693                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2694                 copy_size = uni_path_len;
2695                 if (copy_size % 8 != 0)
2696                         copy_size = roundup(copy_size, 8);
2697                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2698                 if (!copy_path)
2699                         return -ENOMEM;
2700                 memcpy((char *)copy_path, (const char *)path,
2701                        uni_path_len);
2702                 uni_path_len = copy_size;
2703                 path = copy_path;
2704         }
2705
2706         iov[1].iov_len = uni_path_len;
2707         iov[1].iov_base = path;
2708
2709         if ((!server->oplocks) || (tcon->no_lease))
2710                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2711
2712         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2713             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2714                 req->RequestedOplockLevel = *oplock;
2715         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2716                   (oparms->create_options & CREATE_NOT_FILE))
2717                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2718         else {
2719                 rc = add_lease_context(server, iov, &n_iov,
2720                                        oparms->fid->lease_key, oplock);
2721                 if (rc)
2722                         return rc;
2723         }
2724
2725         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2726                 /* need to set Next field of lease context if we request it */
2727                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2728                         struct create_context *ccontext =
2729                             (struct create_context *)iov[n_iov-1].iov_base;
2730                         ccontext->Next =
2731                                 cpu_to_le32(server->vals->create_lease_size);
2732                 }
2733
2734                 rc = add_durable_context(iov, &n_iov, oparms,
2735                                         tcon->use_persistent);
2736                 if (rc)
2737                         return rc;
2738         }
2739
2740         if (tcon->posix_extensions) {
2741                 if (n_iov > 2) {
2742                         struct create_context *ccontext =
2743                             (struct create_context *)iov[n_iov-1].iov_base;
2744                         ccontext->Next =
2745                                 cpu_to_le32(iov[n_iov-1].iov_len);
2746                 }
2747
2748                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2749                 if (rc)
2750                         return rc;
2751         }
2752
2753         if (tcon->snapshot_time) {
2754                 cifs_dbg(FYI, "adding snapshot context\n");
2755                 if (n_iov > 2) {
2756                         struct create_context *ccontext =
2757                             (struct create_context *)iov[n_iov-1].iov_base;
2758                         ccontext->Next =
2759                                 cpu_to_le32(iov[n_iov-1].iov_len);
2760                 }
2761
2762                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2763                 if (rc)
2764                         return rc;
2765         }
2766
2767         if ((oparms->disposition != FILE_OPEN) &&
2768             (oparms->cifs_sb) &&
2769             (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2770             (oparms->mode != ACL_NO_MODE)) {
2771                 if (n_iov > 2) {
2772                         struct create_context *ccontext =
2773                             (struct create_context *)iov[n_iov-1].iov_base;
2774                         ccontext->Next =
2775                                 cpu_to_le32(iov[n_iov-1].iov_len);
2776                 }
2777
2778                 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2779                 rc = add_sd_context(iov, &n_iov, oparms->mode);
2780                 if (rc)
2781                         return rc;
2782         }
2783
2784         if (n_iov > 2) {
2785                 struct create_context *ccontext =
2786                         (struct create_context *)iov[n_iov-1].iov_base;
2787                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2788         }
2789         add_query_id_context(iov, &n_iov);
2790
2791         rqst->rq_nvec = n_iov;
2792         return 0;
2793 }
2794
2795 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2796  * All other vectors are freed by kfree().
2797  */
2798 void
2799 SMB2_open_free(struct smb_rqst *rqst)
2800 {
2801         int i;
2802
2803         if (rqst && rqst->rq_iov) {
2804                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2805                 for (i = 1; i < rqst->rq_nvec; i++)
2806                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2807                                 kfree(rqst->rq_iov[i].iov_base);
2808         }
2809 }
2810
2811 int
2812 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2813           __u8 *oplock, struct smb2_file_all_info *buf,
2814           struct create_posix_rsp *posix,
2815           struct kvec *err_iov, int *buftype)
2816 {
2817         struct smb_rqst rqst;
2818         struct smb2_create_rsp *rsp = NULL;
2819         struct cifs_tcon *tcon = oparms->tcon;
2820         struct cifs_ses *ses = tcon->ses;
2821         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2822         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2823         struct kvec rsp_iov = {NULL, 0};
2824         int resp_buftype = CIFS_NO_BUFFER;
2825         int rc = 0;
2826         int flags = 0;
2827
2828         cifs_dbg(FYI, "create/open\n");
2829         if (!ses || !server)
2830                 return -EIO;
2831
2832         if (smb3_encryption_required(tcon))
2833                 flags |= CIFS_TRANSFORM_REQ;
2834
2835         memset(&rqst, 0, sizeof(struct smb_rqst));
2836         memset(&iov, 0, sizeof(iov));
2837         rqst.rq_iov = iov;
2838         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2839
2840         rc = SMB2_open_init(tcon, server,
2841                             &rqst, oplock, oparms, path);
2842         if (rc)
2843                 goto creat_exit;
2844
2845         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2846                 oparms->create_options, oparms->desired_access);
2847
2848         rc = cifs_send_recv(xid, ses, server,
2849                             &rqst, &resp_buftype, flags,
2850                             &rsp_iov);
2851         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2852
2853         if (rc != 0) {
2854                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2855                 if (err_iov && rsp) {
2856                         *err_iov = rsp_iov;
2857                         *buftype = resp_buftype;
2858                         resp_buftype = CIFS_NO_BUFFER;
2859                         rsp = NULL;
2860                 }
2861                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2862                                     oparms->create_options, oparms->desired_access, rc);
2863                 if (rc == -EREMCHG) {
2864                         pr_warn_once("server share %s deleted\n",
2865                                      tcon->treeName);
2866                         tcon->need_reconnect = true;
2867                 }
2868                 goto creat_exit;
2869         } else
2870                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2871                                      ses->Suid, oparms->create_options,
2872                                      oparms->desired_access);
2873
2874         atomic_inc(&tcon->num_remote_opens);
2875         oparms->fid->persistent_fid = rsp->PersistentFileId;
2876         oparms->fid->volatile_fid = rsp->VolatileFileId;
2877         oparms->fid->access = oparms->desired_access;
2878 #ifdef CONFIG_CIFS_DEBUG2
2879         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2880 #endif /* CIFS_DEBUG2 */
2881
2882         if (buf) {
2883                 memcpy(buf, &rsp->CreationTime, 32);
2884                 buf->AllocationSize = rsp->AllocationSize;
2885                 buf->EndOfFile = rsp->EndofFile;
2886                 buf->Attributes = rsp->FileAttributes;
2887                 buf->NumberOfLinks = cpu_to_le32(1);
2888                 buf->DeletePending = 0;
2889         }
2890
2891
2892         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2893                             oparms->fid->lease_key, oplock, buf, posix);
2894 creat_exit:
2895         SMB2_open_free(&rqst);
2896         free_rsp_buf(resp_buftype, rsp);
2897         return rc;
2898 }
2899
2900 int
2901 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2902                 struct smb_rqst *rqst,
2903                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2904                 bool is_fsctl, char *in_data, u32 indatalen,
2905                 __u32 max_response_size)
2906 {
2907         struct smb2_ioctl_req *req;
2908         struct kvec *iov = rqst->rq_iov;
2909         unsigned int total_len;
2910         int rc;
2911         char *in_data_buf;
2912
2913         rc = smb2_ioctl_req_init(opcode, tcon, server,
2914                                  (void **) &req, &total_len);
2915         if (rc)
2916                 return rc;
2917
2918         if (indatalen) {
2919                 /*
2920                  * indatalen is usually small at a couple of bytes max, so
2921                  * just allocate through generic pool
2922                  */
2923                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2924                 if (!in_data_buf) {
2925                         cifs_small_buf_release(req);
2926                         return -ENOMEM;
2927                 }
2928         }
2929
2930         req->CtlCode = cpu_to_le32(opcode);
2931         req->PersistentFileId = persistent_fid;
2932         req->VolatileFileId = volatile_fid;
2933
2934         iov[0].iov_base = (char *)req;
2935         /*
2936          * If no input data, the size of ioctl struct in
2937          * protocol spec still includes a 1 byte data buffer,
2938          * but if input data passed to ioctl, we do not
2939          * want to double count this, so we do not send
2940          * the dummy one byte of data in iovec[0] if sending
2941          * input data (in iovec[1]).
2942          */
2943         if (indatalen) {
2944                 req->InputCount = cpu_to_le32(indatalen);
2945                 /* do not set InputOffset if no input data */
2946                 req->InputOffset =
2947                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2948                 rqst->rq_nvec = 2;
2949                 iov[0].iov_len = total_len - 1;
2950                 iov[1].iov_base = in_data_buf;
2951                 iov[1].iov_len = indatalen;
2952         } else {
2953                 rqst->rq_nvec = 1;
2954                 iov[0].iov_len = total_len;
2955         }
2956
2957         req->OutputOffset = 0;
2958         req->OutputCount = 0; /* MBZ */
2959
2960         /*
2961          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2962          * We Could increase default MaxOutputResponse, but that could require
2963          * more credits. Windows typically sets this smaller, but for some
2964          * ioctls it may be useful to allow server to send more. No point
2965          * limiting what the server can send as long as fits in one credit
2966          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2967          * to increase this limit up in the future.
2968          * Note that for snapshot queries that servers like Azure expect that
2969          * the first query be minimal size (and just used to get the number/size
2970          * of previous versions) so response size must be specified as EXACTLY
2971          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2972          * of eight bytes.  Currently that is the only case where we set max
2973          * response size smaller.
2974          */
2975         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2976         req->sync_hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(max_response_size, SMB2_MAX_BUFFER_SIZE));
2977         if (is_fsctl)
2978                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2979         else
2980                 req->Flags = 0;
2981
2982         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2983         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2984                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2985
2986         return 0;
2987 }
2988
2989 void
2990 SMB2_ioctl_free(struct smb_rqst *rqst)
2991 {
2992         int i;
2993         if (rqst && rqst->rq_iov) {
2994                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2995                 for (i = 1; i < rqst->rq_nvec; i++)
2996                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2997                                 kfree(rqst->rq_iov[i].iov_base);
2998         }
2999 }
3000
3001
3002 /*
3003  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3004  */
3005 int
3006 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3007            u64 volatile_fid, u32 opcode, bool is_fsctl,
3008            char *in_data, u32 indatalen, u32 max_out_data_len,
3009            char **out_data, u32 *plen /* returned data len */)
3010 {
3011         struct smb_rqst rqst;
3012         struct smb2_ioctl_rsp *rsp = NULL;
3013         struct cifs_ses *ses;
3014         struct TCP_Server_Info *server;
3015         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3016         struct kvec rsp_iov = {NULL, 0};
3017         int resp_buftype = CIFS_NO_BUFFER;
3018         int rc = 0;
3019         int flags = 0;
3020
3021         cifs_dbg(FYI, "SMB2 IOCTL\n");
3022
3023         if (out_data != NULL)
3024                 *out_data = NULL;
3025
3026         /* zero out returned data len, in case of error */
3027         if (plen)
3028                 *plen = 0;
3029
3030         if (!tcon)
3031                 return -EIO;
3032
3033         ses = tcon->ses;
3034         if (!ses)
3035                 return -EIO;
3036
3037         server = cifs_pick_channel(ses);
3038         if (!server)
3039                 return -EIO;
3040
3041         if (smb3_encryption_required(tcon))
3042                 flags |= CIFS_TRANSFORM_REQ;
3043
3044         memset(&rqst, 0, sizeof(struct smb_rqst));
3045         memset(&iov, 0, sizeof(iov));
3046         rqst.rq_iov = iov;
3047         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3048
3049         rc = SMB2_ioctl_init(tcon, server,
3050                              &rqst, persistent_fid, volatile_fid, opcode,
3051                              is_fsctl, in_data, indatalen, max_out_data_len);
3052         if (rc)
3053                 goto ioctl_exit;
3054
3055         rc = cifs_send_recv(xid, ses, server,
3056                             &rqst, &resp_buftype, flags,
3057                             &rsp_iov);
3058         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3059
3060         if (rc != 0)
3061                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3062                                 ses->Suid, 0, opcode, rc);
3063
3064         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3065                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3066                 goto ioctl_exit;
3067         } else if (rc == -EINVAL) {
3068                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3069                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3070                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3071                         goto ioctl_exit;
3072                 }
3073         } else if (rc == -E2BIG) {
3074                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3075                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3076                         goto ioctl_exit;
3077                 }
3078         }
3079
3080         /* check if caller wants to look at return data or just return rc */
3081         if ((plen == NULL) || (out_data == NULL))
3082                 goto ioctl_exit;
3083
3084         *plen = le32_to_cpu(rsp->OutputCount);
3085
3086         /* We check for obvious errors in the output buffer length and offset */
3087         if (*plen == 0)
3088                 goto ioctl_exit; /* server returned no data */
3089         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3090                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3091                 *plen = 0;
3092                 rc = -EIO;
3093                 goto ioctl_exit;
3094         }
3095
3096         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3097                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3098                         le32_to_cpu(rsp->OutputOffset));
3099                 *plen = 0;
3100                 rc = -EIO;
3101                 goto ioctl_exit;
3102         }
3103
3104         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3105                             *plen, GFP_KERNEL);
3106         if (*out_data == NULL) {
3107                 rc = -ENOMEM;
3108                 goto ioctl_exit;
3109         }
3110
3111 ioctl_exit:
3112         SMB2_ioctl_free(&rqst);
3113         free_rsp_buf(resp_buftype, rsp);
3114         return rc;
3115 }
3116
3117 /*
3118  *   Individual callers to ioctl worker function follow
3119  */
3120
3121 int
3122 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3123                      u64 persistent_fid, u64 volatile_fid)
3124 {
3125         int rc;
3126         struct  compress_ioctl fsctl_input;
3127         char *ret_data = NULL;
3128
3129         fsctl_input.CompressionState =
3130                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3131
3132         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3133                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3134                         (char *)&fsctl_input /* data input */,
3135                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3136                         &ret_data /* out data */, NULL);
3137
3138         cifs_dbg(FYI, "set compression rc %d\n", rc);
3139
3140         return rc;
3141 }
3142
3143 int
3144 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3145                 struct smb_rqst *rqst,
3146                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3147 {
3148         struct smb2_close_req *req;
3149         struct kvec *iov = rqst->rq_iov;
3150         unsigned int total_len;
3151         int rc;
3152
3153         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3154                                  (void **) &req, &total_len);
3155         if (rc)
3156                 return rc;
3157
3158         req->PersistentFileId = persistent_fid;
3159         req->VolatileFileId = volatile_fid;
3160         if (query_attrs)
3161                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3162         else
3163                 req->Flags = 0;
3164         iov[0].iov_base = (char *)req;
3165         iov[0].iov_len = total_len;
3166
3167         return 0;
3168 }
3169
3170 void
3171 SMB2_close_free(struct smb_rqst *rqst)
3172 {
3173         if (rqst && rqst->rq_iov)
3174                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3175 }
3176
3177 int
3178 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3179              u64 persistent_fid, u64 volatile_fid,
3180              struct smb2_file_network_open_info *pbuf)
3181 {
3182         struct smb_rqst rqst;
3183         struct smb2_close_rsp *rsp = NULL;
3184         struct cifs_ses *ses = tcon->ses;
3185         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3186         struct kvec iov[1];
3187         struct kvec rsp_iov;
3188         int resp_buftype = CIFS_NO_BUFFER;
3189         int rc = 0;
3190         int flags = 0;
3191         bool query_attrs = false;
3192
3193         cifs_dbg(FYI, "Close\n");
3194
3195         if (!ses || !server)
3196                 return -EIO;
3197
3198         if (smb3_encryption_required(tcon))
3199                 flags |= CIFS_TRANSFORM_REQ;
3200
3201         memset(&rqst, 0, sizeof(struct smb_rqst));
3202         memset(&iov, 0, sizeof(iov));
3203         rqst.rq_iov = iov;
3204         rqst.rq_nvec = 1;
3205
3206         /* check if need to ask server to return timestamps in close response */
3207         if (pbuf)
3208                 query_attrs = true;
3209
3210         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3211         rc = SMB2_close_init(tcon, server,
3212                              &rqst, persistent_fid, volatile_fid,
3213                              query_attrs);
3214         if (rc)
3215                 goto close_exit;
3216
3217         rc = cifs_send_recv(xid, ses, server,
3218                             &rqst, &resp_buftype, flags, &rsp_iov);
3219         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3220
3221         if (rc != 0) {
3222                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3223                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3224                                      rc);
3225                 goto close_exit;
3226         } else {
3227                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3228                                       ses->Suid);
3229                 /*
3230                  * Note that have to subtract 4 since struct network_open_info
3231                  * has a final 4 byte pad that close response does not have
3232                  */
3233                 if (pbuf)
3234                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3235         }
3236
3237         atomic_dec(&tcon->num_remote_opens);
3238 close_exit:
3239         SMB2_close_free(&rqst);
3240         free_rsp_buf(resp_buftype, rsp);
3241
3242         /* retry close in a worker thread if this one is interrupted */
3243         if (rc == -EINTR) {
3244                 int tmp_rc;
3245
3246                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3247                                                      volatile_fid);
3248                 if (tmp_rc)
3249                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3250                                  persistent_fid, tmp_rc);
3251         }
3252         return rc;
3253 }
3254
3255 int
3256 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3257                 u64 persistent_fid, u64 volatile_fid)
3258 {
3259         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3260 }
3261
3262 int
3263 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3264                   struct kvec *iov, unsigned int min_buf_size)
3265 {
3266         unsigned int smb_len = iov->iov_len;
3267         char *end_of_smb = smb_len + (char *)iov->iov_base;
3268         char *begin_of_buf = offset + (char *)iov->iov_base;
3269         char *end_of_buf = begin_of_buf + buffer_length;
3270
3271
3272         if (buffer_length < min_buf_size) {
3273                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3274                          buffer_length, min_buf_size);
3275                 return -EINVAL;
3276         }
3277
3278         /* check if beyond RFC1001 maximum length */
3279         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3280                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3281                          buffer_length, smb_len);
3282                 return -EINVAL;
3283         }
3284
3285         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3286                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3287                 return -EINVAL;
3288         }
3289
3290         return 0;
3291 }
3292
3293 /*
3294  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3295  * Caller must free buffer.
3296  */
3297 int
3298 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3299                            struct kvec *iov, unsigned int minbufsize,
3300                            char *data)
3301 {
3302         char *begin_of_buf = offset + (char *)iov->iov_base;
3303         int rc;
3304
3305         if (!data)
3306                 return -EINVAL;
3307
3308         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3309         if (rc)
3310                 return rc;
3311
3312         memcpy(data, begin_of_buf, buffer_length);
3313
3314         return 0;
3315 }
3316
3317 int
3318 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3319                      struct smb_rqst *rqst,
3320                      u64 persistent_fid, u64 volatile_fid,
3321                      u8 info_class, u8 info_type, u32 additional_info,
3322                      size_t output_len, size_t input_len, void *input)
3323 {
3324         struct smb2_query_info_req *req;
3325         struct kvec *iov = rqst->rq_iov;
3326         unsigned int total_len;
3327         int rc;
3328
3329         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3330                                  (void **) &req, &total_len);
3331         if (rc)
3332                 return rc;
3333
3334         req->InfoType = info_type;
3335         req->FileInfoClass = info_class;
3336         req->PersistentFileId = persistent_fid;
3337         req->VolatileFileId = volatile_fid;
3338         req->AdditionalInformation = cpu_to_le32(additional_info);
3339
3340         req->OutputBufferLength = cpu_to_le32(output_len);
3341         if (input_len) {
3342                 req->InputBufferLength = cpu_to_le32(input_len);
3343                 /* total_len for smb query request never close to le16 max */
3344                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3345                 memcpy(req->Buffer, input, input_len);
3346         }
3347
3348         iov[0].iov_base = (char *)req;
3349         /* 1 for Buffer */
3350         iov[0].iov_len = total_len - 1 + input_len;
3351         return 0;
3352 }
3353
3354 void
3355 SMB2_query_info_free(struct smb_rqst *rqst)
3356 {
3357         if (rqst && rqst->rq_iov)
3358                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3359 }
3360
3361 static int
3362 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3363            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3364            u32 additional_info, size_t output_len, size_t min_len, void **data,
3365                 u32 *dlen)
3366 {
3367         struct smb_rqst rqst;
3368         struct smb2_query_info_rsp *rsp = NULL;
3369         struct kvec iov[1];
3370         struct kvec rsp_iov;
3371         int rc = 0;
3372         int resp_buftype = CIFS_NO_BUFFER;
3373         struct cifs_ses *ses = tcon->ses;
3374         struct TCP_Server_Info *server;
3375         int flags = 0;
3376         bool allocated = false;
3377
3378         cifs_dbg(FYI, "Query Info\n");
3379
3380         if (!ses)
3381                 return -EIO;
3382         server = cifs_pick_channel(ses);
3383         if (!server)
3384                 return -EIO;
3385
3386         if (smb3_encryption_required(tcon))
3387                 flags |= CIFS_TRANSFORM_REQ;
3388
3389         memset(&rqst, 0, sizeof(struct smb_rqst));
3390         memset(&iov, 0, sizeof(iov));
3391         rqst.rq_iov = iov;
3392         rqst.rq_nvec = 1;
3393
3394         rc = SMB2_query_info_init(tcon, server,
3395                                   &rqst, persistent_fid, volatile_fid,
3396                                   info_class, info_type, additional_info,
3397                                   output_len, 0, NULL);
3398         if (rc)
3399                 goto qinf_exit;
3400
3401         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3402                                     ses->Suid, info_class, (__u32)info_type);
3403
3404         rc = cifs_send_recv(xid, ses, server,
3405                             &rqst, &resp_buftype, flags, &rsp_iov);
3406         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3407
3408         if (rc) {
3409                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3410                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3411                                 ses->Suid, info_class, (__u32)info_type, rc);
3412                 goto qinf_exit;
3413         }
3414
3415         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3416                                 ses->Suid, info_class, (__u32)info_type);
3417
3418         if (dlen) {
3419                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3420                 if (!*data) {
3421                         *data = kmalloc(*dlen, GFP_KERNEL);
3422                         if (!*data) {
3423                                 cifs_tcon_dbg(VFS,
3424                                         "Error %d allocating memory for acl\n",
3425                                         rc);
3426                                 *dlen = 0;
3427                                 rc = -ENOMEM;
3428                                 goto qinf_exit;
3429                         }
3430                         allocated = true;
3431                 }
3432         }
3433
3434         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3435                                         le32_to_cpu(rsp->OutputBufferLength),
3436                                         &rsp_iov, min_len, *data);
3437         if (rc && allocated) {
3438                 kfree(*data);
3439                 *data = NULL;
3440                 *dlen = 0;
3441         }
3442
3443 qinf_exit:
3444         SMB2_query_info_free(&rqst);
3445         free_rsp_buf(resp_buftype, rsp);
3446         return rc;
3447 }
3448
3449 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3450         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3451 {
3452         return query_info(xid, tcon, persistent_fid, volatile_fid,
3453                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3454                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3455                           sizeof(struct smb2_file_all_info), (void **)&data,
3456                           NULL);
3457 }
3458
3459 int
3460 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3461                 u64 persistent_fid, u64 volatile_fid,
3462                 void **data, u32 *plen)
3463 {
3464         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3465         *plen = 0;
3466
3467         return query_info(xid, tcon, persistent_fid, volatile_fid,
3468                           0, SMB2_O_INFO_SECURITY, additional_info,
3469                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3470 }
3471
3472 int
3473 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3474                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3475 {
3476         return query_info(xid, tcon, persistent_fid, volatile_fid,
3477                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3478                           sizeof(struct smb2_file_internal_info),
3479                           sizeof(struct smb2_file_internal_info),
3480                           (void **)&uniqueid, NULL);
3481 }
3482
3483 /*
3484  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3485  * See MS-SMB2 2.2.35 and 2.2.36
3486  */
3487
3488 static int
3489 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3490                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3491                  u64 persistent_fid, u64 volatile_fid,
3492                  u32 completion_filter, bool watch_tree)
3493 {
3494         struct smb2_change_notify_req *req;
3495         struct kvec *iov = rqst->rq_iov;
3496         unsigned int total_len;
3497         int rc;
3498
3499         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3500                                  (void **) &req, &total_len);
3501         if (rc)
3502                 return rc;
3503
3504         req->PersistentFileId = persistent_fid;
3505         req->VolatileFileId = volatile_fid;
3506         /* See note 354 of MS-SMB2, 64K max */
3507         req->OutputBufferLength =
3508                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3509         req->CompletionFilter = cpu_to_le32(completion_filter);
3510         if (watch_tree)
3511                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3512         else
3513                 req->Flags = 0;
3514
3515         iov[0].iov_base = (char *)req;
3516         iov[0].iov_len = total_len;
3517
3518         return 0;
3519 }
3520
3521 int
3522 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3523                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3524                 u32 completion_filter)
3525 {
3526         struct cifs_ses *ses = tcon->ses;
3527         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3528         struct smb_rqst rqst;
3529         struct kvec iov[1];
3530         struct kvec rsp_iov = {NULL, 0};
3531         int resp_buftype = CIFS_NO_BUFFER;
3532         int flags = 0;
3533         int rc = 0;
3534
3535         cifs_dbg(FYI, "change notify\n");
3536         if (!ses || !server)
3537                 return -EIO;
3538
3539         if (smb3_encryption_required(tcon))
3540                 flags |= CIFS_TRANSFORM_REQ;
3541
3542         memset(&rqst, 0, sizeof(struct smb_rqst));
3543         memset(&iov, 0, sizeof(iov));
3544         rqst.rq_iov = iov;
3545         rqst.rq_nvec = 1;
3546
3547         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3548                               persistent_fid, volatile_fid,
3549                               completion_filter, watch_tree);
3550         if (rc)
3551                 goto cnotify_exit;
3552
3553         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3554                                 (u8)watch_tree, completion_filter);
3555         rc = cifs_send_recv(xid, ses, server,
3556                             &rqst, &resp_buftype, flags, &rsp_iov);
3557
3558         if (rc != 0) {
3559                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3560                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3561                                 (u8)watch_tree, completion_filter, rc);
3562         } else
3563                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3564                                 ses->Suid, (u8)watch_tree, completion_filter);
3565
3566  cnotify_exit:
3567         if (rqst.rq_iov)
3568                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3569         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3570         return rc;
3571 }
3572
3573
3574
3575 /*
3576  * This is a no-op for now. We're not really interested in the reply, but
3577  * rather in the fact that the server sent one and that server->lstrp
3578  * gets updated.
3579  *
3580  * FIXME: maybe we should consider checking that the reply matches request?
3581  */
3582 static void
3583 smb2_echo_callback(struct mid_q_entry *mid)
3584 {
3585         struct TCP_Server_Info *server = mid->callback_data;
3586         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3587         struct cifs_credits credits = { .value = 0, .instance = 0 };
3588
3589         if (mid->mid_state == MID_RESPONSE_RECEIVED
3590             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3591                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3592                 credits.instance = server->reconnect_instance;
3593         }
3594
3595         DeleteMidQEntry(mid);
3596         add_credits(server, &credits, CIFS_ECHO_OP);
3597 }
3598
3599 void smb2_reconnect_server(struct work_struct *work)
3600 {
3601         struct TCP_Server_Info *server = container_of(work,
3602                                         struct TCP_Server_Info, reconnect.work);
3603         struct cifs_ses *ses;
3604         struct cifs_tcon *tcon, *tcon2;
3605         struct list_head tmp_list;
3606         int tcon_exist = false;
3607         int rc;
3608         int resched = false;
3609
3610
3611         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3612         mutex_lock(&server->reconnect_mutex);
3613
3614         INIT_LIST_HEAD(&tmp_list);
3615         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3616
3617         spin_lock(&cifs_tcp_ses_lock);
3618         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3619                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3620                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3621                                 tcon->tc_count++;
3622                                 list_add_tail(&tcon->rlist, &tmp_list);
3623                                 tcon_exist = true;
3624                         }
3625                 }
3626                 /*
3627                  * IPC has the same lifetime as its session and uses its
3628                  * refcount.
3629                  */
3630                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3631                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3632                         tcon_exist = true;
3633                         ses->ses_count++;
3634                 }
3635         }
3636         /*
3637          * Get the reference to server struct to be sure that the last call of
3638          * cifs_put_tcon() in the loop below won't release the server pointer.
3639          */
3640         if (tcon_exist)
3641                 server->srv_count++;
3642
3643         spin_unlock(&cifs_tcp_ses_lock);
3644
3645         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3646                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3647                 if (!rc)
3648                         cifs_reopen_persistent_handles(tcon);
3649                 else
3650                         resched = true;
3651                 list_del_init(&tcon->rlist);
3652                 if (tcon->ipc)
3653                         cifs_put_smb_ses(tcon->ses);
3654                 else
3655                         cifs_put_tcon(tcon);
3656         }
3657
3658         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3659         if (resched)
3660                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3661         mutex_unlock(&server->reconnect_mutex);
3662
3663         /* now we can safely release srv struct */
3664         if (tcon_exist)
3665                 cifs_put_tcp_session(server, 1);
3666 }
3667
3668 int
3669 SMB2_echo(struct TCP_Server_Info *server)
3670 {
3671         struct smb2_echo_req *req;
3672         int rc = 0;
3673         struct kvec iov[1];
3674         struct smb_rqst rqst = { .rq_iov = iov,
3675                                  .rq_nvec = 1 };
3676         unsigned int total_len;
3677
3678         cifs_dbg(FYI, "In echo request\n");
3679
3680         if (server->tcpStatus == CifsNeedNegotiate) {
3681                 /* No need to send echo on newly established connections */
3682                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3683                 return rc;
3684         }
3685
3686         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3687                                  (void **)&req, &total_len);
3688         if (rc)
3689                 return rc;
3690
3691         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3692
3693         iov[0].iov_len = total_len;
3694         iov[0].iov_base = (char *)req;
3695
3696         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3697                              server, CIFS_ECHO_OP, NULL);
3698         if (rc)
3699                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3700
3701         cifs_small_buf_release(req);
3702         return rc;
3703 }
3704
3705 void
3706 SMB2_flush_free(struct smb_rqst *rqst)
3707 {
3708         if (rqst && rqst->rq_iov)
3709                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3710 }
3711
3712 int
3713 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3714                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3715                 u64 persistent_fid, u64 volatile_fid)
3716 {
3717         struct smb2_flush_req *req;
3718         struct kvec *iov = rqst->rq_iov;
3719         unsigned int total_len;
3720         int rc;
3721
3722         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3723                                  (void **) &req, &total_len);
3724         if (rc)
3725                 return rc;
3726
3727         req->PersistentFileId = persistent_fid;
3728         req->VolatileFileId = volatile_fid;
3729
3730         iov[0].iov_base = (char *)req;
3731         iov[0].iov_len = total_len;
3732
3733         return 0;
3734 }
3735
3736 int
3737 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3738            u64 volatile_fid)
3739 {
3740         struct cifs_ses *ses = tcon->ses;
3741         struct smb_rqst rqst;
3742         struct kvec iov[1];
3743         struct kvec rsp_iov = {NULL, 0};
3744         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3745         int resp_buftype = CIFS_NO_BUFFER;
3746         int flags = 0;
3747         int rc = 0;
3748
3749         cifs_dbg(FYI, "flush\n");
3750         if (!ses || !(ses->server))
3751                 return -EIO;
3752
3753         if (smb3_encryption_required(tcon))
3754                 flags |= CIFS_TRANSFORM_REQ;
3755
3756         memset(&rqst, 0, sizeof(struct smb_rqst));
3757         memset(&iov, 0, sizeof(iov));
3758         rqst.rq_iov = iov;
3759         rqst.rq_nvec = 1;
3760
3761         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3762                              persistent_fid, volatile_fid);
3763         if (rc)
3764                 goto flush_exit;
3765
3766         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3767         rc = cifs_send_recv(xid, ses, server,
3768                             &rqst, &resp_buftype, flags, &rsp_iov);
3769
3770         if (rc != 0) {
3771                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3772                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3773                                      rc);
3774         } else
3775                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3776                                       ses->Suid);
3777
3778  flush_exit:
3779         SMB2_flush_free(&rqst);
3780         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3781         return rc;
3782 }
3783
3784 /*
3785  * To form a chain of read requests, any read requests after the first should
3786  * have the end_of_chain boolean set to true.
3787  */
3788 static int
3789 smb2_new_read_req(void **buf, unsigned int *total_len,
3790         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3791         unsigned int remaining_bytes, int request_type)
3792 {
3793         int rc = -EACCES;
3794         struct smb2_read_plain_req *req = NULL;
3795         struct smb2_sync_hdr *shdr;
3796         struct TCP_Server_Info *server = io_parms->server;
3797
3798         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3799                                  (void **) &req, total_len);
3800         if (rc)
3801                 return rc;
3802
3803         if (server == NULL)
3804                 return -ECONNABORTED;
3805
3806         shdr = &req->sync_hdr;
3807         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3808
3809         req->PersistentFileId = io_parms->persistent_fid;
3810         req->VolatileFileId = io_parms->volatile_fid;
3811         req->ReadChannelInfoOffset = 0; /* reserved */
3812         req->ReadChannelInfoLength = 0; /* reserved */
3813         req->Channel = 0; /* reserved */
3814         req->MinimumCount = 0;
3815         req->Length = cpu_to_le32(io_parms->length);
3816         req->Offset = cpu_to_le64(io_parms->offset);
3817
3818         trace_smb3_read_enter(0 /* xid */,
3819                         io_parms->persistent_fid,
3820                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3821                         io_parms->offset, io_parms->length);
3822 #ifdef CONFIG_CIFS_SMB_DIRECT
3823         /*
3824          * If we want to do a RDMA write, fill in and append
3825          * smbd_buffer_descriptor_v1 to the end of read request
3826          */
3827         if (server->rdma && rdata && !server->sign &&
3828                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3829
3830                 struct smbd_buffer_descriptor_v1 *v1;
3831                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3832
3833                 rdata->mr = smbd_register_mr(
3834                                 server->smbd_conn, rdata->pages,
3835                                 rdata->nr_pages, rdata->page_offset,
3836                                 rdata->tailsz, true, need_invalidate);
3837                 if (!rdata->mr)
3838                         return -EAGAIN;
3839
3840                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3841                 if (need_invalidate)
3842                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3843                 req->ReadChannelInfoOffset =
3844                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3845                 req->ReadChannelInfoLength =
3846                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3847                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3848                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3849                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3850                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3851
3852                 *total_len += sizeof(*v1) - 1;
3853         }
3854 #endif
3855         if (request_type & CHAINED_REQUEST) {
3856                 if (!(request_type & END_OF_CHAIN)) {
3857                         /* next 8-byte aligned request */
3858                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3859                         shdr->NextCommand = cpu_to_le32(*total_len);
3860                 } else /* END_OF_CHAIN */
3861                         shdr->NextCommand = 0;
3862                 if (request_type & RELATED_REQUEST) {
3863                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3864                         /*
3865                          * Related requests use info from previous read request
3866                          * in chain.
3867                          */
3868                         shdr->SessionId = 0xFFFFFFFF;
3869                         shdr->TreeId = 0xFFFFFFFF;
3870                         req->PersistentFileId = 0xFFFFFFFF;
3871                         req->VolatileFileId = 0xFFFFFFFF;
3872                 }
3873         }
3874         if (remaining_bytes > io_parms->length)
3875                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3876         else
3877                 req->RemainingBytes = 0;
3878
3879         *buf = req;
3880         return rc;
3881 }
3882
3883 static void
3884 smb2_readv_callback(struct mid_q_entry *mid)
3885 {
3886         struct cifs_readdata *rdata = mid->callback_data;
3887         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3888         struct TCP_Server_Info *server = rdata->server;
3889         struct smb2_sync_hdr *shdr =
3890                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3891         struct cifs_credits credits = { .value = 0, .instance = 0 };
3892         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3893                                  .rq_nvec = 1,
3894                                  .rq_pages = rdata->pages,
3895                                  .rq_offset = rdata->page_offset,
3896                                  .rq_npages = rdata->nr_pages,
3897                                  .rq_pagesz = rdata->pagesz,
3898                                  .rq_tailsz = rdata->tailsz };
3899
3900         WARN_ONCE(rdata->server != mid->server,
3901                   "rdata server %p != mid server %p",
3902                   rdata->server, mid->server);
3903
3904         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3905                  __func__, mid->mid, mid->mid_state, rdata->result,
3906                  rdata->bytes);
3907
3908         switch (mid->mid_state) {
3909         case MID_RESPONSE_RECEIVED:
3910                 credits.value = le16_to_cpu(shdr->CreditRequest);
3911                 credits.instance = server->reconnect_instance;
3912                 /* result already set, check signature */
3913                 if (server->sign && !mid->decrypted) {
3914                         int rc;
3915
3916                         rc = smb2_verify_signature(&rqst, server);
3917                         if (rc)
3918                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3919                                          rc);
3920                 }
3921                 /* FIXME: should this be counted toward the initiating task? */
3922                 task_io_account_read(rdata->got_bytes);
3923                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3924                 break;
3925         case MID_REQUEST_SUBMITTED:
3926         case MID_RETRY_NEEDED:
3927                 rdata->result = -EAGAIN;
3928                 if (server->sign && rdata->got_bytes)
3929                         /* reset bytes number since we can not check a sign */
3930                         rdata->got_bytes = 0;
3931                 /* FIXME: should this be counted toward the initiating task? */
3932                 task_io_account_read(rdata->got_bytes);
3933                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3934                 break;
3935         case MID_RESPONSE_MALFORMED:
3936                 credits.value = le16_to_cpu(shdr->CreditRequest);
3937                 credits.instance = server->reconnect_instance;
3938                 /* fall through */
3939         default:
3940                 rdata->result = -EIO;
3941         }
3942 #ifdef CONFIG_CIFS_SMB_DIRECT
3943         /*
3944          * If this rdata has a memmory registered, the MR can be freed
3945          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3946          * because they have limited number and are used for future I/Os
3947          */
3948         if (rdata->mr) {
3949                 smbd_deregister_mr(rdata->mr);
3950                 rdata->mr = NULL;
3951         }
3952 #endif
3953         if (rdata->result && rdata->result != -ENODATA) {
3954                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3955                 trace_smb3_read_err(0 /* xid */,
3956                                     rdata->cfile->fid.persistent_fid,
3957                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3958                                     rdata->bytes, rdata->result);
3959         } else
3960                 trace_smb3_read_done(0 /* xid */,
3961                                      rdata->cfile->fid.persistent_fid,
3962                                      tcon->tid, tcon->ses->Suid,
3963                                      rdata->offset, rdata->got_bytes);
3964
3965         queue_work(cifsiod_wq, &rdata->work);
3966         DeleteMidQEntry(mid);
3967         add_credits(server, &credits, 0);
3968 }
3969
3970 /* smb2_async_readv - send an async read, and set up mid to handle result */
3971 int
3972 smb2_async_readv(struct cifs_readdata *rdata)
3973 {
3974         int rc, flags = 0;
3975         char *buf;
3976         struct smb2_sync_hdr *shdr;
3977         struct cifs_io_parms io_parms;
3978         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3979                                  .rq_nvec = 1 };
3980         struct TCP_Server_Info *server;
3981         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3982         unsigned int total_len;
3983
3984         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3985                  __func__, rdata->offset, rdata->bytes);
3986
3987         if (!rdata->server)
3988                 rdata->server = cifs_pick_channel(tcon->ses);
3989
3990         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3991         io_parms.server = server = rdata->server;
3992         io_parms.offset = rdata->offset;
3993         io_parms.length = rdata->bytes;
3994         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3995         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3996         io_parms.pid = rdata->pid;
3997
3998         rc = smb2_new_read_req(
3999                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4000         if (rc)
4001                 return rc;
4002
4003         if (smb3_encryption_required(io_parms.tcon))
4004                 flags |= CIFS_TRANSFORM_REQ;
4005
4006         rdata->iov[0].iov_base = buf;
4007         rdata->iov[0].iov_len = total_len;
4008
4009         shdr = (struct smb2_sync_hdr *)buf;
4010
4011         if (rdata->credits.value > 0) {
4012                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4013                                                 SMB2_MAX_BUFFER_SIZE));
4014                 shdr->CreditRequest =
4015                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4016
4017                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4018                 if (rc)
4019                         goto async_readv_out;
4020
4021                 flags |= CIFS_HAS_CREDITS;
4022         }
4023
4024         kref_get(&rdata->refcount);
4025         rc = cifs_call_async(server, &rqst,
4026                              cifs_readv_receive, smb2_readv_callback,
4027                              smb3_handle_read_data, rdata, flags,
4028                              &rdata->credits);
4029         if (rc) {
4030                 kref_put(&rdata->refcount, cifs_readdata_release);
4031                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4032                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4033                                     io_parms.tcon->tid,
4034                                     io_parms.tcon->ses->Suid,
4035                                     io_parms.offset, io_parms.length, rc);
4036         }
4037
4038 async_readv_out:
4039         cifs_small_buf_release(buf);
4040         return rc;
4041 }
4042
4043 int
4044 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4045           unsigned int *nbytes, char **buf, int *buf_type)
4046 {
4047         struct smb_rqst rqst;
4048         int resp_buftype, rc;
4049         struct smb2_read_plain_req *req = NULL;
4050         struct smb2_read_rsp *rsp = NULL;
4051         struct kvec iov[1];
4052         struct kvec rsp_iov;
4053         unsigned int total_len;
4054         int flags = CIFS_LOG_ERROR;
4055         struct cifs_ses *ses = io_parms->tcon->ses;
4056
4057         if (!io_parms->server)
4058                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4059
4060         *nbytes = 0;
4061         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4062         if (rc)
4063                 return rc;
4064
4065         if (smb3_encryption_required(io_parms->tcon))
4066                 flags |= CIFS_TRANSFORM_REQ;
4067
4068         iov[0].iov_base = (char *)req;
4069         iov[0].iov_len = total_len;
4070
4071         memset(&rqst, 0, sizeof(struct smb_rqst));
4072         rqst.rq_iov = iov;
4073         rqst.rq_nvec = 1;
4074
4075         rc = cifs_send_recv(xid, ses, io_parms->server,
4076                             &rqst, &resp_buftype, flags, &rsp_iov);
4077         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4078
4079         if (rc) {
4080                 if (rc != -ENODATA) {
4081                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4082                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4083                         trace_smb3_read_err(xid, req->PersistentFileId,
4084                                             io_parms->tcon->tid, ses->Suid,
4085                                             io_parms->offset, io_parms->length,
4086                                             rc);
4087                 } else
4088                         trace_smb3_read_done(xid, req->PersistentFileId,
4089                                     io_parms->tcon->tid, ses->Suid,
4090                                     io_parms->offset, 0);
4091                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4092                 cifs_small_buf_release(req);
4093                 return rc == -ENODATA ? 0 : rc;
4094         } else
4095                 trace_smb3_read_done(xid, req->PersistentFileId,
4096                                     io_parms->tcon->tid, ses->Suid,
4097                                     io_parms->offset, io_parms->length);
4098
4099         cifs_small_buf_release(req);
4100
4101         *nbytes = le32_to_cpu(rsp->DataLength);
4102         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4103             (*nbytes > io_parms->length)) {
4104                 cifs_dbg(FYI, "bad length %d for count %d\n",
4105                          *nbytes, io_parms->length);
4106                 rc = -EIO;
4107                 *nbytes = 0;
4108         }
4109
4110         if (*buf) {
4111                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4112                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4113         } else if (resp_buftype != CIFS_NO_BUFFER) {
4114                 *buf = rsp_iov.iov_base;
4115                 if (resp_buftype == CIFS_SMALL_BUFFER)
4116                         *buf_type = CIFS_SMALL_BUFFER;
4117                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4118                         *buf_type = CIFS_LARGE_BUFFER;
4119         }
4120         return rc;
4121 }
4122
4123 /*
4124  * Check the mid_state and signature on received buffer (if any), and queue the
4125  * workqueue completion task.
4126  */
4127 static void
4128 smb2_writev_callback(struct mid_q_entry *mid)
4129 {
4130         struct cifs_writedata *wdata = mid->callback_data;
4131         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4132         struct TCP_Server_Info *server = wdata->server;
4133         unsigned int written;
4134         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4135         struct cifs_credits credits = { .value = 0, .instance = 0 };
4136
4137         WARN_ONCE(wdata->server != mid->server,
4138                   "wdata server %p != mid server %p",
4139                   wdata->server, mid->server);
4140
4141         switch (mid->mid_state) {
4142         case MID_RESPONSE_RECEIVED:
4143                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4144                 credits.instance = server->reconnect_instance;
4145                 wdata->result = smb2_check_receive(mid, server, 0);
4146                 if (wdata->result != 0)
4147                         break;
4148
4149                 written = le32_to_cpu(rsp->DataLength);
4150                 /*
4151                  * Mask off high 16 bits when bytes written as returned
4152                  * by the server is greater than bytes requested by the
4153                  * client. OS/2 servers are known to set incorrect
4154                  * CountHigh values.
4155                  */
4156                 if (written > wdata->bytes)
4157                         written &= 0xFFFF;
4158
4159                 if (written < wdata->bytes)
4160                         wdata->result = -ENOSPC;
4161                 else
4162                         wdata->bytes = written;
4163                 break;
4164         case MID_REQUEST_SUBMITTED:
4165         case MID_RETRY_NEEDED:
4166                 wdata->result = -EAGAIN;
4167                 break;
4168         case MID_RESPONSE_MALFORMED:
4169                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4170                 credits.instance = server->reconnect_instance;
4171                 /* fall through */
4172         default:
4173                 wdata->result = -EIO;
4174                 break;
4175         }
4176 #ifdef CONFIG_CIFS_SMB_DIRECT
4177         /*
4178          * If this wdata has a memory registered, the MR can be freed
4179          * The number of MRs available is limited, it's important to recover
4180          * used MR as soon as I/O is finished. Hold MR longer in the later
4181          * I/O process can possibly result in I/O deadlock due to lack of MR
4182          * to send request on I/O retry
4183          */
4184         if (wdata->mr) {
4185                 smbd_deregister_mr(wdata->mr);
4186                 wdata->mr = NULL;
4187         }
4188 #endif
4189         if (wdata->result) {
4190                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4191                 trace_smb3_write_err(0 /* no xid */,
4192                                      wdata->cfile->fid.persistent_fid,
4193                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4194                                      wdata->bytes, wdata->result);
4195                 if (wdata->result == -ENOSPC)
4196                         pr_warn_once("Out of space writing to %s\n",
4197                                      tcon->treeName);
4198         } else
4199                 trace_smb3_write_done(0 /* no xid */,
4200                                       wdata->cfile->fid.persistent_fid,
4201                                       tcon->tid, tcon->ses->Suid,
4202                                       wdata->offset, wdata->bytes);
4203
4204         queue_work(cifsiod_wq, &wdata->work);
4205         DeleteMidQEntry(mid);
4206         add_credits(server, &credits, 0);
4207 }
4208
4209 /* smb2_async_writev - send an async write, and set up mid to handle result */
4210 int
4211 smb2_async_writev(struct cifs_writedata *wdata,
4212                   void (*release)(struct kref *kref))
4213 {
4214         int rc = -EACCES, flags = 0;
4215         struct smb2_write_req *req = NULL;
4216         struct smb2_sync_hdr *shdr;
4217         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4218         struct TCP_Server_Info *server = wdata->server;
4219         struct kvec iov[1];
4220         struct smb_rqst rqst = { };
4221         unsigned int total_len;
4222
4223         if (!wdata->server)
4224                 server = wdata->server = cifs_pick_channel(tcon->ses);
4225
4226         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4227                                  (void **) &req, &total_len);
4228         if (rc)
4229                 return rc;
4230
4231         if (smb3_encryption_required(tcon))
4232                 flags |= CIFS_TRANSFORM_REQ;
4233
4234         shdr = (struct smb2_sync_hdr *)req;
4235         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4236
4237         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4238         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4239         req->WriteChannelInfoOffset = 0;
4240         req->WriteChannelInfoLength = 0;
4241         req->Channel = 0;
4242         req->Offset = cpu_to_le64(wdata->offset);
4243         req->DataOffset = cpu_to_le16(
4244                                 offsetof(struct smb2_write_req, Buffer));
4245         req->RemainingBytes = 0;
4246
4247         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4248                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4249 #ifdef CONFIG_CIFS_SMB_DIRECT
4250         /*
4251          * If we want to do a server RDMA read, fill in and append
4252          * smbd_buffer_descriptor_v1 to the end of write request
4253          */
4254         if (server->rdma && !server->sign && wdata->bytes >=
4255                 server->smbd_conn->rdma_readwrite_threshold) {
4256
4257                 struct smbd_buffer_descriptor_v1 *v1;
4258                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4259
4260                 wdata->mr = smbd_register_mr(
4261                                 server->smbd_conn, wdata->pages,
4262                                 wdata->nr_pages, wdata->page_offset,
4263                                 wdata->tailsz, false, need_invalidate);
4264                 if (!wdata->mr) {
4265                         rc = -EAGAIN;
4266                         goto async_writev_out;
4267                 }
4268                 req->Length = 0;
4269                 req->DataOffset = 0;
4270                 if (wdata->nr_pages > 1)
4271                         req->RemainingBytes =
4272                                 cpu_to_le32(
4273                                         (wdata->nr_pages - 1) * wdata->pagesz -
4274                                         wdata->page_offset + wdata->tailsz
4275                                 );
4276                 else
4277                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4278                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4279                 if (need_invalidate)
4280                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4281                 req->WriteChannelInfoOffset =
4282                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4283                 req->WriteChannelInfoLength =
4284                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4285                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4286                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4287                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4288                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4289         }
4290 #endif
4291         iov[0].iov_len = total_len - 1;
4292         iov[0].iov_base = (char *)req;
4293
4294         rqst.rq_iov = iov;
4295         rqst.rq_nvec = 1;
4296         rqst.rq_pages = wdata->pages;
4297         rqst.rq_offset = wdata->page_offset;
4298         rqst.rq_npages = wdata->nr_pages;
4299         rqst.rq_pagesz = wdata->pagesz;
4300         rqst.rq_tailsz = wdata->tailsz;
4301 #ifdef CONFIG_CIFS_SMB_DIRECT
4302         if (wdata->mr) {
4303                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4304                 rqst.rq_npages = 0;
4305         }
4306 #endif
4307         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4308                  wdata->offset, wdata->bytes);
4309
4310 #ifdef CONFIG_CIFS_SMB_DIRECT
4311         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4312         if (!wdata->mr)
4313                 req->Length = cpu_to_le32(wdata->bytes);
4314 #else
4315         req->Length = cpu_to_le32(wdata->bytes);
4316 #endif
4317
4318         if (wdata->credits.value > 0) {
4319                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4320                                                     SMB2_MAX_BUFFER_SIZE));
4321                 shdr->CreditRequest =
4322                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4323
4324                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4325                 if (rc)
4326                         goto async_writev_out;
4327
4328                 flags |= CIFS_HAS_CREDITS;
4329         }
4330
4331         kref_get(&wdata->refcount);
4332         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4333                              wdata, flags, &wdata->credits);
4334
4335         if (rc) {
4336                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4337                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4338                                      wdata->bytes, rc);
4339                 kref_put(&wdata->refcount, release);
4340                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4341         }
4342
4343 async_writev_out:
4344         cifs_small_buf_release(req);
4345         return rc;
4346 }
4347
4348 /*
4349  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4350  * The length field from io_parms must be at least 1 and indicates a number of
4351  * elements with data to write that begins with position 1 in iov array. All
4352  * data length is specified by count.
4353  */
4354 int
4355 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4356            unsigned int *nbytes, struct kvec *iov, int n_vec)
4357 {
4358         struct smb_rqst rqst;
4359         int rc = 0;
4360         struct smb2_write_req *req = NULL;
4361         struct smb2_write_rsp *rsp = NULL;
4362         int resp_buftype;
4363         struct kvec rsp_iov;
4364         int flags = 0;
4365         unsigned int total_len;
4366         struct TCP_Server_Info *server;
4367
4368         *nbytes = 0;
4369
4370         if (n_vec < 1)
4371                 return rc;
4372
4373         if (!io_parms->server)
4374                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4375         server = io_parms->server;
4376         if (server == NULL)
4377                 return -ECONNABORTED;
4378
4379         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4380                                  (void **) &req, &total_len);
4381         if (rc)
4382                 return rc;
4383
4384         if (smb3_encryption_required(io_parms->tcon))
4385                 flags |= CIFS_TRANSFORM_REQ;
4386
4387         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4388
4389         req->PersistentFileId = io_parms->persistent_fid;
4390         req->VolatileFileId = io_parms->volatile_fid;
4391         req->WriteChannelInfoOffset = 0;
4392         req->WriteChannelInfoLength = 0;
4393         req->Channel = 0;
4394         req->Length = cpu_to_le32(io_parms->length);
4395         req->Offset = cpu_to_le64(io_parms->offset);
4396         req->DataOffset = cpu_to_le16(
4397                                 offsetof(struct smb2_write_req, Buffer));
4398         req->RemainingBytes = 0;
4399
4400         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4401                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4402                 io_parms->offset, io_parms->length);
4403
4404         iov[0].iov_base = (char *)req;
4405         /* 1 for Buffer */
4406         iov[0].iov_len = total_len - 1;
4407
4408         memset(&rqst, 0, sizeof(struct smb_rqst));
4409         rqst.rq_iov = iov;
4410         rqst.rq_nvec = n_vec + 1;
4411
4412         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4413                             &rqst,
4414                             &resp_buftype, flags, &rsp_iov);
4415         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4416
4417         if (rc) {
4418                 trace_smb3_write_err(xid, req->PersistentFileId,
4419                                      io_parms->tcon->tid,
4420                                      io_parms->tcon->ses->Suid,
4421                                      io_parms->offset, io_parms->length, rc);
4422                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4423                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4424         } else {
4425                 *nbytes = le32_to_cpu(rsp->DataLength);
4426                 trace_smb3_write_done(xid, req->PersistentFileId,
4427                                      io_parms->tcon->tid,
4428                                      io_parms->tcon->ses->Suid,
4429                                      io_parms->offset, *nbytes);
4430         }
4431
4432         cifs_small_buf_release(req);
4433         free_rsp_buf(resp_buftype, rsp);
4434         return rc;
4435 }
4436
4437 int posix_info_sid_size(const void *beg, const void *end)
4438 {
4439         size_t subauth;
4440         int total;
4441
4442         if (beg + 1 > end)
4443                 return -1;
4444
4445         subauth = *(u8 *)(beg+1);
4446         if (subauth < 1 || subauth > 15)
4447                 return -1;
4448
4449         total = 1 + 1 + 6 + 4*subauth;
4450         if (beg + total > end)
4451                 return -1;
4452
4453         return total;
4454 }
4455
4456 int posix_info_parse(const void *beg, const void *end,
4457                      struct smb2_posix_info_parsed *out)
4458
4459 {
4460         int total_len = 0;
4461         int sid_len;
4462         int name_len;
4463         const void *owner_sid;
4464         const void *group_sid;
4465         const void *name;
4466
4467         /* if no end bound given, assume payload to be correct */
4468         if (!end) {
4469                 const struct smb2_posix_info *p = beg;
4470
4471                 end = beg + le32_to_cpu(p->NextEntryOffset);
4472                 /* last element will have a 0 offset, pick a sensible bound */
4473                 if (end == beg)
4474                         end += 0xFFFF;
4475         }
4476
4477         /* check base buf */
4478         if (beg + sizeof(struct smb2_posix_info) > end)
4479                 return -1;
4480         total_len = sizeof(struct smb2_posix_info);
4481
4482         /* check owner sid */
4483         owner_sid = beg + total_len;
4484         sid_len = posix_info_sid_size(owner_sid, end);
4485         if (sid_len < 0)
4486                 return -1;
4487         total_len += sid_len;
4488
4489         /* check group sid */
4490         group_sid = beg + total_len;
4491         sid_len = posix_info_sid_size(group_sid, end);
4492         if (sid_len < 0)
4493                 return -1;
4494         total_len += sid_len;
4495
4496         /* check name len */
4497         if (beg + total_len + 4 > end)
4498                 return -1;
4499         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4500         if (name_len < 1 || name_len > 0xFFFF)
4501                 return -1;
4502         total_len += 4;
4503
4504         /* check name */
4505         name = beg + total_len;
4506         if (name + name_len > end)
4507                 return -1;
4508         total_len += name_len;
4509
4510         if (out) {
4511                 out->base = beg;
4512                 out->size = total_len;
4513                 out->name_len = name_len;
4514                 out->name = name;
4515                 memcpy(&out->owner, owner_sid,
4516                        posix_info_sid_size(owner_sid, end));
4517                 memcpy(&out->group, group_sid,
4518                        posix_info_sid_size(group_sid, end));
4519         }
4520         return total_len;
4521 }
4522
4523 static int posix_info_extra_size(const void *beg, const void *end)
4524 {
4525         int len = posix_info_parse(beg, end, NULL);
4526
4527         if (len < 0)
4528                 return -1;
4529         return len - sizeof(struct smb2_posix_info);
4530 }
4531
4532 static unsigned int
4533 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4534             size_t size)
4535 {
4536         int len;
4537         unsigned int entrycount = 0;
4538         unsigned int next_offset = 0;
4539         char *entryptr;
4540         FILE_DIRECTORY_INFO *dir_info;
4541
4542         if (bufstart == NULL)
4543                 return 0;
4544
4545         entryptr = bufstart;
4546
4547         while (1) {
4548                 if (entryptr + next_offset < entryptr ||
4549                     entryptr + next_offset > end_of_buf ||
4550                     entryptr + next_offset + size > end_of_buf) {
4551                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4552                         break;
4553                 }
4554
4555                 entryptr = entryptr + next_offset;
4556                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4557
4558                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4559                         len = posix_info_extra_size(entryptr, end_of_buf);
4560                 else
4561                         len = le32_to_cpu(dir_info->FileNameLength);
4562
4563                 if (len < 0 ||
4564                     entryptr + len < entryptr ||
4565                     entryptr + len > end_of_buf ||
4566                     entryptr + len + size > end_of_buf) {
4567                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4568                                  end_of_buf);
4569                         break;
4570                 }
4571
4572                 *lastentry = entryptr;
4573                 entrycount++;
4574
4575                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4576                 if (!next_offset)
4577                         break;
4578         }
4579
4580         return entrycount;
4581 }
4582
4583 /*
4584  * Readdir/FindFirst
4585  */
4586 int SMB2_query_directory_init(const unsigned int xid,
4587                               struct cifs_tcon *tcon,
4588                               struct TCP_Server_Info *server,
4589                               struct smb_rqst *rqst,
4590                               u64 persistent_fid, u64 volatile_fid,
4591                               int index, int info_level)
4592 {
4593         struct smb2_query_directory_req *req;
4594         unsigned char *bufptr;
4595         __le16 asteriks = cpu_to_le16('*');
4596         unsigned int output_size = CIFSMaxBufSize -
4597                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4598                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4599         unsigned int total_len;
4600         struct kvec *iov = rqst->rq_iov;
4601         int len, rc;
4602
4603         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4604                                  (void **) &req, &total_len);
4605         if (rc)
4606                 return rc;
4607
4608         switch (info_level) {
4609         case SMB_FIND_FILE_DIRECTORY_INFO:
4610                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4611                 break;
4612         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4613                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4614                 break;
4615         case SMB_FIND_FILE_POSIX_INFO:
4616                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4617                 break;
4618         default:
4619                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4620                         info_level);
4621                 return -EINVAL;
4622         }
4623
4624         req->FileIndex = cpu_to_le32(index);
4625         req->PersistentFileId = persistent_fid;
4626         req->VolatileFileId = volatile_fid;
4627
4628         len = 0x2;
4629         bufptr = req->Buffer;
4630         memcpy(bufptr, &asteriks, len);
4631
4632         req->FileNameOffset =
4633                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4634         req->FileNameLength = cpu_to_le16(len);
4635         /*
4636          * BB could be 30 bytes or so longer if we used SMB2 specific
4637          * buffer lengths, but this is safe and close enough.
4638          */
4639         output_size = min_t(unsigned int, output_size, server->maxBuf);
4640         output_size = min_t(unsigned int, output_size, 2 << 15);
4641         req->OutputBufferLength = cpu_to_le32(output_size);
4642
4643         iov[0].iov_base = (char *)req;
4644         /* 1 for Buffer */
4645         iov[0].iov_len = total_len - 1;
4646
4647         iov[1].iov_base = (char *)(req->Buffer);
4648         iov[1].iov_len = len;
4649
4650         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4651                         tcon->ses->Suid, index, output_size);
4652
4653         return 0;
4654 }
4655
4656 void SMB2_query_directory_free(struct smb_rqst *rqst)
4657 {
4658         if (rqst && rqst->rq_iov) {
4659                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4660         }
4661 }
4662
4663 int
4664 smb2_parse_query_directory(struct cifs_tcon *tcon,
4665                            struct kvec *rsp_iov,
4666                            int resp_buftype,
4667                            struct cifs_search_info *srch_inf)
4668 {
4669         struct smb2_query_directory_rsp *rsp;
4670         size_t info_buf_size;
4671         char *end_of_smb;
4672         int rc;
4673
4674         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4675
4676         switch (srch_inf->info_level) {
4677         case SMB_FIND_FILE_DIRECTORY_INFO:
4678                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4679                 break;
4680         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4681                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4682                 break;
4683         case SMB_FIND_FILE_POSIX_INFO:
4684                 /* note that posix payload are variable size */
4685                 info_buf_size = sizeof(struct smb2_posix_info);
4686                 break;
4687         default:
4688                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4689                          srch_inf->info_level);
4690                 return -EINVAL;
4691         }
4692
4693         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4694                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4695                                info_buf_size);
4696         if (rc) {
4697                 cifs_tcon_dbg(VFS, "bad info payload");
4698                 return rc;
4699         }
4700
4701         srch_inf->unicode = true;
4702
4703         if (srch_inf->ntwrk_buf_start) {
4704                 if (srch_inf->smallBuf)
4705                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4706                 else
4707                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4708         }
4709         srch_inf->ntwrk_buf_start = (char *)rsp;
4710         srch_inf->srch_entries_start = srch_inf->last_entry =
4711                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4712         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4713
4714         srch_inf->entries_in_buffer = num_entries(
4715                 srch_inf->info_level,
4716                 srch_inf->srch_entries_start,
4717                 end_of_smb,
4718                 &srch_inf->last_entry,
4719                 info_buf_size);
4720
4721         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4722         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4723                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4724                  srch_inf->srch_entries_start, srch_inf->last_entry);
4725         if (resp_buftype == CIFS_LARGE_BUFFER)
4726                 srch_inf->smallBuf = false;
4727         else if (resp_buftype == CIFS_SMALL_BUFFER)
4728                 srch_inf->smallBuf = true;
4729         else
4730                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4731
4732         return 0;
4733 }
4734
4735 int
4736 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4737                      u64 persistent_fid, u64 volatile_fid, int index,
4738                      struct cifs_search_info *srch_inf)
4739 {
4740         struct smb_rqst rqst;
4741         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4742         struct smb2_query_directory_rsp *rsp = NULL;
4743         int resp_buftype = CIFS_NO_BUFFER;
4744         struct kvec rsp_iov;
4745         int rc = 0;
4746         struct cifs_ses *ses = tcon->ses;
4747         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4748         int flags = 0;
4749
4750         if (!ses || !(ses->server))
4751                 return -EIO;
4752
4753         if (smb3_encryption_required(tcon))
4754                 flags |= CIFS_TRANSFORM_REQ;
4755
4756         memset(&rqst, 0, sizeof(struct smb_rqst));
4757         memset(&iov, 0, sizeof(iov));
4758         rqst.rq_iov = iov;
4759         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4760
4761         rc = SMB2_query_directory_init(xid, tcon, server,
4762                                        &rqst, persistent_fid,
4763                                        volatile_fid, index,
4764                                        srch_inf->info_level);
4765         if (rc)
4766                 goto qdir_exit;
4767
4768         rc = cifs_send_recv(xid, ses, server,
4769                             &rqst, &resp_buftype, flags, &rsp_iov);
4770         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4771
4772         if (rc) {
4773                 if (rc == -ENODATA &&
4774                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4775                         trace_smb3_query_dir_done(xid, persistent_fid,
4776                                 tcon->tid, tcon->ses->Suid, index, 0);
4777                         srch_inf->endOfSearch = true;
4778                         rc = 0;
4779                 } else {
4780                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4781                                 tcon->ses->Suid, index, 0, rc);
4782                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4783                 }
4784                 goto qdir_exit;
4785         }
4786
4787         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4788                                         srch_inf);
4789         if (rc) {
4790                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4791                         tcon->ses->Suid, index, 0, rc);
4792                 goto qdir_exit;
4793         }
4794         resp_buftype = CIFS_NO_BUFFER;
4795
4796         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4797                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4798
4799 qdir_exit:
4800         SMB2_query_directory_free(&rqst);
4801         free_rsp_buf(resp_buftype, rsp);
4802         return rc;
4803 }
4804
4805 int
4806 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4807                    struct smb_rqst *rqst,
4808                    u64 persistent_fid, u64 volatile_fid, u32 pid,
4809                    u8 info_class, u8 info_type, u32 additional_info,
4810                    void **data, unsigned int *size)
4811 {
4812         struct smb2_set_info_req *req;
4813         struct kvec *iov = rqst->rq_iov;
4814         unsigned int i, total_len;
4815         int rc;
4816
4817         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4818                                  (void **) &req, &total_len);
4819         if (rc)
4820                 return rc;
4821
4822         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4823         req->InfoType = info_type;
4824         req->FileInfoClass = info_class;
4825         req->PersistentFileId = persistent_fid;
4826         req->VolatileFileId = volatile_fid;
4827         req->AdditionalInformation = cpu_to_le32(additional_info);
4828
4829         req->BufferOffset =
4830                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4831         req->BufferLength = cpu_to_le32(*size);
4832
4833         memcpy(req->Buffer, *data, *size);
4834         total_len += *size;
4835
4836         iov[0].iov_base = (char *)req;
4837         /* 1 for Buffer */
4838         iov[0].iov_len = total_len - 1;
4839
4840         for (i = 1; i < rqst->rq_nvec; i++) {
4841                 le32_add_cpu(&req->BufferLength, size[i]);
4842                 iov[i].iov_base = (char *)data[i];
4843                 iov[i].iov_len = size[i];
4844         }
4845
4846         return 0;
4847 }
4848
4849 void
4850 SMB2_set_info_free(struct smb_rqst *rqst)
4851 {
4852         if (rqst && rqst->rq_iov)
4853                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4854 }
4855
4856 static int
4857 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4858                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4859                u8 info_type, u32 additional_info, unsigned int num,
4860                 void **data, unsigned int *size)
4861 {
4862         struct smb_rqst rqst;
4863         struct smb2_set_info_rsp *rsp = NULL;
4864         struct kvec *iov;
4865         struct kvec rsp_iov;
4866         int rc = 0;
4867         int resp_buftype;
4868         struct cifs_ses *ses = tcon->ses;
4869         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4870         int flags = 0;
4871
4872         if (!ses || !server)
4873                 return -EIO;
4874
4875         if (!num)
4876                 return -EINVAL;
4877
4878         if (smb3_encryption_required(tcon))
4879                 flags |= CIFS_TRANSFORM_REQ;
4880
4881         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4882         if (!iov)
4883                 return -ENOMEM;
4884
4885         memset(&rqst, 0, sizeof(struct smb_rqst));
4886         rqst.rq_iov = iov;
4887         rqst.rq_nvec = num;
4888
4889         rc = SMB2_set_info_init(tcon, server,
4890                                 &rqst, persistent_fid, volatile_fid, pid,
4891                                 info_class, info_type, additional_info,
4892                                 data, size);
4893         if (rc) {
4894                 kfree(iov);
4895                 return rc;
4896         }
4897
4898
4899         rc = cifs_send_recv(xid, ses, server,
4900                             &rqst, &resp_buftype, flags,
4901                             &rsp_iov);
4902         SMB2_set_info_free(&rqst);
4903         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4904
4905         if (rc != 0) {
4906                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4907                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4908                                 ses->Suid, info_class, (__u32)info_type, rc);
4909         }
4910
4911         free_rsp_buf(resp_buftype, rsp);
4912         kfree(iov);
4913         return rc;
4914 }
4915
4916 int
4917 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4918              u64 volatile_fid, u32 pid, __le64 *eof)
4919 {
4920         struct smb2_file_eof_info info;
4921         void *data;
4922         unsigned int size;
4923
4924         info.EndOfFile = *eof;
4925
4926         data = &info;
4927         size = sizeof(struct smb2_file_eof_info);
4928
4929         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4930                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4931                         0, 1, &data, &size);
4932 }
4933
4934 int
4935 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4936                 u64 persistent_fid, u64 volatile_fid,
4937                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4938 {
4939         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4940                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4941                         1, (void **)&pnntsd, &pacllen);
4942 }
4943
4944 int
4945 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4946             u64 persistent_fid, u64 volatile_fid,
4947             struct smb2_file_full_ea_info *buf, int len)
4948 {
4949         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4950                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4951                 0, 1, (void **)&buf, &len);
4952 }
4953
4954 int
4955 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4956                   const u64 persistent_fid, const u64 volatile_fid,
4957                   __u8 oplock_level)
4958 {
4959         struct smb_rqst rqst;
4960         int rc;
4961         struct smb2_oplock_break *req = NULL;
4962         struct cifs_ses *ses = tcon->ses;
4963         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4964         int flags = CIFS_OBREAK_OP;
4965         unsigned int total_len;
4966         struct kvec iov[1];
4967         struct kvec rsp_iov;
4968         int resp_buf_type;
4969
4970         cifs_dbg(FYI, "SMB2_oplock_break\n");
4971         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
4972                                  (void **) &req, &total_len);
4973         if (rc)
4974                 return rc;
4975
4976         if (smb3_encryption_required(tcon))
4977                 flags |= CIFS_TRANSFORM_REQ;
4978
4979         req->VolatileFid = volatile_fid;
4980         req->PersistentFid = persistent_fid;
4981         req->OplockLevel = oplock_level;
4982         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4983
4984         flags |= CIFS_NO_RSP_BUF;
4985
4986         iov[0].iov_base = (char *)req;
4987         iov[0].iov_len = total_len;
4988
4989         memset(&rqst, 0, sizeof(struct smb_rqst));
4990         rqst.rq_iov = iov;
4991         rqst.rq_nvec = 1;
4992
4993         rc = cifs_send_recv(xid, ses, server,
4994                             &rqst, &resp_buf_type, flags, &rsp_iov);
4995         cifs_small_buf_release(req);
4996
4997         if (rc) {
4998                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4999                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5000         }
5001
5002         return rc;
5003 }
5004
5005 void
5006 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5007                              struct kstatfs *kst)
5008 {
5009         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5010                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5011         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5012         kst->f_bfree  = kst->f_bavail =
5013                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5014         return;
5015 }
5016
5017 static void
5018 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5019                         struct kstatfs *kst)
5020 {
5021         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5022         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5023         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5024         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5025                 kst->f_bavail = kst->f_bfree;
5026         else
5027                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5028         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5029                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5030         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5031                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5032
5033         return;
5034 }
5035
5036 static int
5037 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5038                    struct TCP_Server_Info *server,
5039                    int level, int outbuf_len, u64 persistent_fid,
5040                    u64 volatile_fid)
5041 {
5042         int rc;
5043         struct smb2_query_info_req *req;
5044         unsigned int total_len;
5045
5046         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5047
5048         if ((tcon->ses == NULL) || server == NULL)
5049                 return -EIO;
5050
5051         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5052                                  (void **) &req, &total_len);
5053         if (rc)
5054                 return rc;
5055
5056         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5057         req->FileInfoClass = level;
5058         req->PersistentFileId = persistent_fid;
5059         req->VolatileFileId = volatile_fid;
5060         /* 1 for pad */
5061         req->InputBufferOffset =
5062                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5063         req->OutputBufferLength = cpu_to_le32(
5064                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5065
5066         iov->iov_base = (char *)req;
5067         iov->iov_len = total_len;
5068         return 0;
5069 }
5070
5071 int
5072 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5073               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5074 {
5075         struct smb_rqst rqst;
5076         struct smb2_query_info_rsp *rsp = NULL;
5077         struct kvec iov;
5078         struct kvec rsp_iov;
5079         int rc = 0;
5080         int resp_buftype;
5081         struct cifs_ses *ses = tcon->ses;
5082         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5083         FILE_SYSTEM_POSIX_INFO *info = NULL;
5084         int flags = 0;
5085
5086         rc = build_qfs_info_req(&iov, tcon, server,
5087                                 FS_POSIX_INFORMATION,
5088                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5089                                 persistent_fid, volatile_fid);
5090         if (rc)
5091                 return rc;
5092
5093         if (smb3_encryption_required(tcon))
5094                 flags |= CIFS_TRANSFORM_REQ;
5095
5096         memset(&rqst, 0, sizeof(struct smb_rqst));
5097         rqst.rq_iov = &iov;
5098         rqst.rq_nvec = 1;
5099
5100         rc = cifs_send_recv(xid, ses, server,
5101                             &rqst, &resp_buftype, flags, &rsp_iov);
5102         cifs_small_buf_release(iov.iov_base);
5103         if (rc) {
5104                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5105                 goto posix_qfsinf_exit;
5106         }
5107         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5108
5109         info = (FILE_SYSTEM_POSIX_INFO *)(
5110                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5111         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5112                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5113                                sizeof(FILE_SYSTEM_POSIX_INFO));
5114         if (!rc)
5115                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5116
5117 posix_qfsinf_exit:
5118         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5119         return rc;
5120 }
5121
5122 int
5123 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5124               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5125 {
5126         struct smb_rqst rqst;
5127         struct smb2_query_info_rsp *rsp = NULL;
5128         struct kvec iov;
5129         struct kvec rsp_iov;
5130         int rc = 0;
5131         int resp_buftype;
5132         struct cifs_ses *ses = tcon->ses;
5133         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5134         struct smb2_fs_full_size_info *info = NULL;
5135         int flags = 0;
5136
5137         rc = build_qfs_info_req(&iov, tcon, server,
5138                                 FS_FULL_SIZE_INFORMATION,
5139                                 sizeof(struct smb2_fs_full_size_info),
5140                                 persistent_fid, volatile_fid);
5141         if (rc)
5142                 return rc;
5143
5144         if (smb3_encryption_required(tcon))
5145                 flags |= CIFS_TRANSFORM_REQ;
5146
5147         memset(&rqst, 0, sizeof(struct smb_rqst));
5148         rqst.rq_iov = &iov;
5149         rqst.rq_nvec = 1;
5150
5151         rc = cifs_send_recv(xid, ses, server,
5152                             &rqst, &resp_buftype, flags, &rsp_iov);
5153         cifs_small_buf_release(iov.iov_base);
5154         if (rc) {
5155                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5156                 goto qfsinf_exit;
5157         }
5158         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5159
5160         info = (struct smb2_fs_full_size_info *)(
5161                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5162         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5163                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5164                                sizeof(struct smb2_fs_full_size_info));
5165         if (!rc)
5166                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5167
5168 qfsinf_exit:
5169         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5170         return rc;
5171 }
5172
5173 int
5174 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5175               u64 persistent_fid, u64 volatile_fid, int level)
5176 {
5177         struct smb_rqst rqst;
5178         struct smb2_query_info_rsp *rsp = NULL;
5179         struct kvec iov;
5180         struct kvec rsp_iov;
5181         int rc = 0;
5182         int resp_buftype, max_len, min_len;
5183         struct cifs_ses *ses = tcon->ses;
5184         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5185         unsigned int rsp_len, offset;
5186         int flags = 0;
5187
5188         if (level == FS_DEVICE_INFORMATION) {
5189                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5190                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5191         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5192                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5193                 min_len = MIN_FS_ATTR_INFO_SIZE;
5194         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5195                 max_len = sizeof(struct smb3_fs_ss_info);
5196                 min_len = sizeof(struct smb3_fs_ss_info);
5197         } else if (level == FS_VOLUME_INFORMATION) {
5198                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5199                 min_len = sizeof(struct smb3_fs_vol_info);
5200         } else {
5201                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5202                 return -EINVAL;
5203         }
5204
5205         rc = build_qfs_info_req(&iov, tcon, server,
5206                                 level, max_len,
5207                                 persistent_fid, volatile_fid);
5208         if (rc)
5209                 return rc;
5210
5211         if (smb3_encryption_required(tcon))
5212                 flags |= CIFS_TRANSFORM_REQ;
5213
5214         memset(&rqst, 0, sizeof(struct smb_rqst));
5215         rqst.rq_iov = &iov;
5216         rqst.rq_nvec = 1;
5217
5218         rc = cifs_send_recv(xid, ses, server,
5219                             &rqst, &resp_buftype, flags, &rsp_iov);
5220         cifs_small_buf_release(iov.iov_base);
5221         if (rc) {
5222                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5223                 goto qfsattr_exit;
5224         }
5225         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5226
5227         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5228         offset = le16_to_cpu(rsp->OutputBufferOffset);
5229         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5230         if (rc)
5231                 goto qfsattr_exit;
5232
5233         if (level == FS_ATTRIBUTE_INFORMATION)
5234                 memcpy(&tcon->fsAttrInfo, offset
5235                         + (char *)rsp, min_t(unsigned int,
5236                         rsp_len, max_len));
5237         else if (level == FS_DEVICE_INFORMATION)
5238                 memcpy(&tcon->fsDevInfo, offset
5239                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5240         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5241                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5242                         (offset + (char *)rsp);
5243                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5244                 tcon->perf_sector_size =
5245                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5246         } else if (level == FS_VOLUME_INFORMATION) {
5247                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5248                         (offset + (char *)rsp);
5249                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5250                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5251         }
5252
5253 qfsattr_exit:
5254         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5255         return rc;
5256 }
5257
5258 int
5259 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5260            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5261            const __u32 num_lock, struct smb2_lock_element *buf)
5262 {
5263         struct smb_rqst rqst;
5264         int rc = 0;
5265         struct smb2_lock_req *req = NULL;
5266         struct kvec iov[2];
5267         struct kvec rsp_iov;
5268         int resp_buf_type;
5269         unsigned int count;
5270         int flags = CIFS_NO_RSP_BUF;
5271         unsigned int total_len;
5272         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5273
5274         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5275
5276         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5277                                  (void **) &req, &total_len);
5278         if (rc)
5279                 return rc;
5280
5281         if (smb3_encryption_required(tcon))
5282                 flags |= CIFS_TRANSFORM_REQ;
5283
5284         req->sync_hdr.ProcessId = cpu_to_le32(pid);
5285         req->LockCount = cpu_to_le16(num_lock);
5286
5287         req->PersistentFileId = persist_fid;
5288         req->VolatileFileId = volatile_fid;
5289
5290         count = num_lock * sizeof(struct smb2_lock_element);
5291
5292         iov[0].iov_base = (char *)req;
5293         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5294         iov[1].iov_base = (char *)buf;
5295         iov[1].iov_len = count;
5296
5297         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5298
5299         memset(&rqst, 0, sizeof(struct smb_rqst));
5300         rqst.rq_iov = iov;
5301         rqst.rq_nvec = 2;
5302
5303         rc = cifs_send_recv(xid, tcon->ses, server,
5304                             &rqst, &resp_buf_type, flags,
5305                             &rsp_iov);
5306         cifs_small_buf_release(req);
5307         if (rc) {
5308                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5309                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5310                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5311                                     tcon->ses->Suid, rc);
5312         }
5313
5314         return rc;
5315 }
5316
5317 int
5318 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5319           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5320           const __u64 length, const __u64 offset, const __u32 lock_flags,
5321           const bool wait)
5322 {
5323         struct smb2_lock_element lock;
5324
5325         lock.Offset = cpu_to_le64(offset);
5326         lock.Length = cpu_to_le64(length);
5327         lock.Flags = cpu_to_le32(lock_flags);
5328         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5329                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5330
5331         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5332 }
5333
5334 int
5335 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5336                  __u8 *lease_key, const __le32 lease_state)
5337 {
5338         struct smb_rqst rqst;
5339         int rc;
5340         struct smb2_lease_ack *req = NULL;
5341         struct cifs_ses *ses = tcon->ses;
5342         int flags = CIFS_OBREAK_OP;
5343         unsigned int total_len;
5344         struct kvec iov[1];
5345         struct kvec rsp_iov;
5346         int resp_buf_type;
5347         __u64 *please_key_high;
5348         __u64 *please_key_low;
5349         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5350
5351         cifs_dbg(FYI, "SMB2_lease_break\n");
5352         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5353                                  (void **) &req, &total_len);
5354         if (rc)
5355                 return rc;
5356
5357         if (smb3_encryption_required(tcon))
5358                 flags |= CIFS_TRANSFORM_REQ;
5359
5360         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5361         req->StructureSize = cpu_to_le16(36);
5362         total_len += 12;
5363
5364         memcpy(req->LeaseKey, lease_key, 16);
5365         req->LeaseState = lease_state;
5366
5367         flags |= CIFS_NO_RSP_BUF;
5368
5369         iov[0].iov_base = (char *)req;
5370         iov[0].iov_len = total_len;
5371
5372         memset(&rqst, 0, sizeof(struct smb_rqst));
5373         rqst.rq_iov = iov;
5374         rqst.rq_nvec = 1;
5375
5376         rc = cifs_send_recv(xid, ses, server,
5377                             &rqst, &resp_buf_type, flags, &rsp_iov);
5378         cifs_small_buf_release(req);
5379
5380         please_key_low = (__u64 *)lease_key;
5381         please_key_high = (__u64 *)(lease_key+8);
5382         if (rc) {
5383                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5384                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5385                         ses->Suid, *please_key_low, *please_key_high, rc);
5386                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5387         } else
5388                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5389                         ses->Suid, *please_key_low, *please_key_high);
5390
5391         return rc;
5392 }