fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French ([email protected])
   7  *              Pavel Shilovsky ([email protected]) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon || !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 See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2321 static void setup_owner_group_sids(char *buf)
2322 {
2323         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2324
2325         /* Populate the user ownership fields S-1-5-88-1 */
2326         sids->owner.Revision = 1;
2327         sids->owner.NumAuth = 3;
2328         sids->owner.Authority[5] = 5;
2329         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2330         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2331         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2332
2333         /* Populate the group ownership fields S-1-5-88-2 */
2334         sids->group.Revision = 1;
2335         sids->group.NumAuth = 3;
2336         sids->group.Authority[5] = 5;
2337         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2338         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2339         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2340
2341         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2342 }
2343
2344 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2345 static struct crt_sd_ctxt *
2346 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2347 {
2348         struct crt_sd_ctxt *buf;
2349         struct cifs_ace *pace;
2350         unsigned int sdlen, acelen;
2351         unsigned int owner_offset = 0;
2352         unsigned int group_offset = 0;
2353
2354         *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 2), 8);
2355
2356         if (set_owner) {
2357                 /* offset fields are from beginning of security descriptor not of create context */
2358                 owner_offset = sizeof(struct smb3_acl) + (sizeof(struct cifs_ace) * 2);
2359
2360                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2361                 *len += sizeof(struct owner_group_sids);
2362         }
2363
2364         buf = kzalloc(*len, GFP_KERNEL);
2365         if (buf == NULL)
2366                 return buf;
2367
2368         if (set_owner) {
2369                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2370                 group_offset = owner_offset + sizeof(struct owner_sid);
2371                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2372         } else {
2373                 buf->sd.OffsetOwner = 0;
2374                 buf->sd.OffsetGroup = 0;
2375         }
2376
2377         sdlen = sizeof(struct smb3_sd) + sizeof(struct smb3_acl) +
2378                  2 * sizeof(struct cifs_ace);
2379         if (set_owner) {
2380                 sdlen += sizeof(struct owner_group_sids);
2381                 setup_owner_group_sids(owner_offset + sizeof(struct create_context) + 8 /* name */
2382                         + (char *)buf);
2383         }
2384
2385         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2386                                         (struct crt_sd_ctxt, sd));
2387         buf->ccontext.DataLength = cpu_to_le32(sdlen);
2388         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2389         buf->ccontext.NameLength = cpu_to_le16(4);
2390         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2391         buf->Name[0] = 'S';
2392         buf->Name[1] = 'e';
2393         buf->Name[2] = 'c';
2394         buf->Name[3] = 'D';
2395         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2396         /*
2397          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2398          * and "DP" ie the DACL is present
2399          */
2400         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2401
2402         /* offset owner, group and Sbz1 and SACL are all zero */
2403         buf->sd.OffsetDacl = cpu_to_le32(sizeof(struct smb3_sd));
2404         buf->acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2405
2406         /* create one ACE to hold the mode embedded in reserved special SID */
2407         pace = (struct cifs_ace *)(sizeof(struct crt_sd_ctxt) + (char *)buf);
2408         acelen = setup_special_mode_ACE(pace, (__u64)mode);
2409
2410         if (set_owner) {
2411                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2412                 pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) + (char *)buf));
2413                 acelen += setup_special_user_owner_ACE(pace);
2414                 /* it does not appear necessary to add an ACE for the NFS group SID */
2415                 buf->acl.AceCount = cpu_to_le16(3);
2416         } else
2417                 buf->acl.AceCount = cpu_to_le16(2);
2418
2419         /* and one more ACE to allow access for authenticated users */
2420         pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) +
2421                 (char *)buf));
2422         acelen += setup_authusers_ACE(pace);
2423
2424         buf->acl.AclSize = cpu_to_le16(sizeof(struct cifs_acl) + acelen);
2425
2426         return buf;
2427 }
2428
2429 static int
2430 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2431 {
2432         struct smb2_create_req *req = iov[0].iov_base;
2433         unsigned int num = *num_iovec;
2434         unsigned int len = 0;
2435
2436         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2437         if (iov[num].iov_base == NULL)
2438                 return -ENOMEM;
2439         iov[num].iov_len = len;
2440         if (!req->CreateContextsOffset)
2441                 req->CreateContextsOffset = cpu_to_le32(
2442                                 sizeof(struct smb2_create_req) +
2443                                 iov[num - 1].iov_len);
2444         le32_add_cpu(&req->CreateContextsLength, len);
2445         *num_iovec = num + 1;
2446         return 0;
2447 }
2448
2449 static struct crt_query_id_ctxt *
2450 create_query_id_buf(void)
2451 {
2452         struct crt_query_id_ctxt *buf;
2453
2454         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2455         if (!buf)
2456                 return NULL;
2457
2458         buf->ccontext.DataOffset = cpu_to_le16(0);
2459         buf->ccontext.DataLength = cpu_to_le32(0);
2460         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2461                                 (struct crt_query_id_ctxt, Name));
2462         buf->ccontext.NameLength = cpu_to_le16(4);
2463         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2464         buf->Name[0] = 'Q';
2465         buf->Name[1] = 'F';
2466         buf->Name[2] = 'i';
2467         buf->Name[3] = 'd';
2468         return buf;
2469 }
2470
2471 /* See MS-SMB2 2.2.13.2.9 */
2472 static int
2473 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2474 {
2475         struct smb2_create_req *req = iov[0].iov_base;
2476         unsigned int num = *num_iovec;
2477
2478         iov[num].iov_base = create_query_id_buf();
2479         if (iov[num].iov_base == NULL)
2480                 return -ENOMEM;
2481         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2482         if (!req->CreateContextsOffset)
2483                 req->CreateContextsOffset = cpu_to_le32(
2484                                 sizeof(struct smb2_create_req) +
2485                                 iov[num - 1].iov_len);
2486         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2487         *num_iovec = num + 1;
2488         return 0;
2489 }
2490
2491 static int
2492 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2493                             const char *treename, const __le16 *path)
2494 {
2495         int treename_len, path_len;
2496         struct nls_table *cp;
2497         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2498
2499         /*
2500          * skip leading "\\"
2501          */
2502         treename_len = strlen(treename);
2503         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2504                 return -EINVAL;
2505
2506         treename += 2;
2507         treename_len -= 2;
2508
2509         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2510
2511         /*
2512          * make room for one path separator between the treename and
2513          * path
2514          */
2515         *out_len = treename_len + 1 + path_len;
2516
2517         /*
2518          * final path needs to be null-terminated UTF16 with a
2519          * size aligned to 8
2520          */
2521
2522         *out_size = roundup((*out_len+1)*2, 8);
2523         *out_path = kzalloc(*out_size, GFP_KERNEL);
2524         if (!*out_path)
2525                 return -ENOMEM;
2526
2527         cp = load_nls_default();
2528         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2529         UniStrcat(*out_path, sep);
2530         UniStrcat(*out_path, path);
2531         unload_nls(cp);
2532
2533         return 0;
2534 }
2535
2536 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2537                                umode_t mode, struct cifs_tcon *tcon,
2538                                const char *full_path,
2539                                struct cifs_sb_info *cifs_sb)
2540 {
2541         struct smb_rqst rqst;
2542         struct smb2_create_req *req;
2543         struct smb2_create_rsp *rsp = NULL;
2544         struct cifs_ses *ses = tcon->ses;
2545         struct kvec iov[3]; /* make sure at least one for each open context */
2546         struct kvec rsp_iov = {NULL, 0};
2547         int resp_buftype;
2548         int uni_path_len;
2549         __le16 *copy_path = NULL;
2550         int copy_size;
2551         int rc = 0;
2552         unsigned int n_iov = 2;
2553         __u32 file_attributes = 0;
2554         char *pc_buf = NULL;
2555         int flags = 0;
2556         unsigned int total_len;
2557         __le16 *utf16_path = NULL;
2558         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2559
2560         cifs_dbg(FYI, "mkdir\n");
2561
2562         /* resource #1: path allocation */
2563         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2564         if (!utf16_path)
2565                 return -ENOMEM;
2566
2567         if (!ses || !server) {
2568                 rc = -EIO;
2569                 goto err_free_path;
2570         }
2571
2572         /* resource #2: request */
2573         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2574                                  (void **) &req, &total_len);
2575         if (rc)
2576                 goto err_free_path;
2577
2578
2579         if (smb3_encryption_required(tcon))
2580                 flags |= CIFS_TRANSFORM_REQ;
2581
2582         req->ImpersonationLevel = IL_IMPERSONATION;
2583         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2584         /* File attributes ignored on open (used in create though) */
2585         req->FileAttributes = cpu_to_le32(file_attributes);
2586         req->ShareAccess = FILE_SHARE_ALL_LE;
2587         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2588         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2589
2590         iov[0].iov_base = (char *)req;
2591         /* -1 since last byte is buf[0] which is sent below (path) */
2592         iov[0].iov_len = total_len - 1;
2593
2594         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2595
2596         /* [MS-SMB2] 2.2.13 NameOffset:
2597          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2598          * the SMB2 header, the file name includes a prefix that will
2599          * be processed during DFS name normalization as specified in
2600          * section 3.3.5.9. Otherwise, the file name is relative to
2601          * the share that is identified by the TreeId in the SMB2
2602          * header.
2603          */
2604         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2605                 int name_len;
2606
2607                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2608                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2609                                                  &name_len,
2610                                                  tcon->treeName, utf16_path);
2611                 if (rc)
2612                         goto err_free_req;
2613
2614                 req->NameLength = cpu_to_le16(name_len * 2);
2615                 uni_path_len = copy_size;
2616                 /* free before overwriting resource */
2617                 kfree(utf16_path);
2618                 utf16_path = copy_path;
2619         } else {
2620                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2621                 /* MUST set path len (NameLength) to 0 opening root of share */
2622                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2623                 if (uni_path_len % 8 != 0) {
2624                         copy_size = roundup(uni_path_len, 8);
2625                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2626                         if (!copy_path) {
2627                                 rc = -ENOMEM;
2628                                 goto err_free_req;
2629                         }
2630                         memcpy((char *)copy_path, (const char *)utf16_path,
2631                                uni_path_len);
2632                         uni_path_len = copy_size;
2633                         /* free before overwriting resource */
2634                         kfree(utf16_path);
2635                         utf16_path = copy_path;
2636                 }
2637         }
2638
2639         iov[1].iov_len = uni_path_len;
2640         iov[1].iov_base = utf16_path;
2641         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2642
2643         if (tcon->posix_extensions) {
2644                 /* resource #3: posix buf */
2645                 rc = add_posix_context(iov, &n_iov, mode);
2646                 if (rc)
2647                         goto err_free_req;
2648                 pc_buf = iov[n_iov-1].iov_base;
2649         }
2650
2651
2652         memset(&rqst, 0, sizeof(struct smb_rqst));
2653         rqst.rq_iov = iov;
2654         rqst.rq_nvec = n_iov;
2655
2656         /* no need to inc num_remote_opens because we close it just below */
2657         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2658                                     FILE_WRITE_ATTRIBUTES);
2659         /* resource #4: response buffer */
2660         rc = cifs_send_recv(xid, ses, server,
2661                             &rqst, &resp_buftype, flags, &rsp_iov);
2662         if (rc) {
2663                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2664                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2665                                            CREATE_NOT_FILE,
2666                                            FILE_WRITE_ATTRIBUTES, rc);
2667                 goto err_free_rsp_buf;
2668         }
2669
2670         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2671         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2672                                     ses->Suid, CREATE_NOT_FILE,
2673                                     FILE_WRITE_ATTRIBUTES);
2674
2675         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2676
2677         /* Eventually save off posix specific response info and timestaps */
2678
2679 err_free_rsp_buf:
2680         free_rsp_buf(resp_buftype, rsp);
2681         kfree(pc_buf);
2682 err_free_req:
2683         cifs_small_buf_release(req);
2684 err_free_path:
2685         kfree(utf16_path);
2686         return rc;
2687 }
2688
2689 int
2690 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2691                struct smb_rqst *rqst, __u8 *oplock,
2692                struct cifs_open_parms *oparms, __le16 *path)
2693 {
2694         struct smb2_create_req *req;
2695         unsigned int n_iov = 2;
2696         __u32 file_attributes = 0;
2697         int copy_size;
2698         int uni_path_len;
2699         unsigned int total_len;
2700         struct kvec *iov = rqst->rq_iov;
2701         __le16 *copy_path;
2702         int rc;
2703
2704         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2705                                  (void **) &req, &total_len);
2706         if (rc)
2707                 return rc;
2708
2709         iov[0].iov_base = (char *)req;
2710         /* -1 since last byte is buf[0] which is sent below (path) */
2711         iov[0].iov_len = total_len - 1;
2712
2713         if (oparms->create_options & CREATE_OPTION_READONLY)
2714                 file_attributes |= ATTR_READONLY;
2715         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2716                 file_attributes |= ATTR_SYSTEM;
2717
2718         req->ImpersonationLevel = IL_IMPERSONATION;
2719         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2720         /* File attributes ignored on open (used in create though) */
2721         req->FileAttributes = cpu_to_le32(file_attributes);
2722         req->ShareAccess = FILE_SHARE_ALL_LE;
2723
2724         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2725         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2726         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2727
2728         /* [MS-SMB2] 2.2.13 NameOffset:
2729          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2730          * the SMB2 header, the file name includes a prefix that will
2731          * be processed during DFS name normalization as specified in
2732          * section 3.3.5.9. Otherwise, the file name is relative to
2733          * the share that is identified by the TreeId in the SMB2
2734          * header.
2735          */
2736         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2737                 int name_len;
2738
2739                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2740                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2741                                                  &name_len,
2742                                                  tcon->treeName, path);
2743                 if (rc)
2744                         return rc;
2745                 req->NameLength = cpu_to_le16(name_len * 2);
2746                 uni_path_len = copy_size;
2747                 path = copy_path;
2748         } else {
2749                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2750                 /* MUST set path len (NameLength) to 0 opening root of share */
2751                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2752                 copy_size = uni_path_len;
2753                 if (copy_size % 8 != 0)
2754                         copy_size = roundup(copy_size, 8);
2755                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2756                 if (!copy_path)
2757                         return -ENOMEM;
2758                 memcpy((char *)copy_path, (const char *)path,
2759                        uni_path_len);
2760                 uni_path_len = copy_size;
2761                 path = copy_path;
2762         }
2763
2764         iov[1].iov_len = uni_path_len;
2765         iov[1].iov_base = path;
2766
2767         if ((!server->oplocks) || (tcon->no_lease))
2768                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2769
2770         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2771             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2772                 req->RequestedOplockLevel = *oplock;
2773         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2774                   (oparms->create_options & CREATE_NOT_FILE))
2775                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2776         else {
2777                 rc = add_lease_context(server, iov, &n_iov,
2778                                        oparms->fid->lease_key, oplock);
2779                 if (rc)
2780                         return rc;
2781         }
2782
2783         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2784                 /* need to set Next field of lease context if we request it */
2785                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2786                         struct create_context *ccontext =
2787                             (struct create_context *)iov[n_iov-1].iov_base;
2788                         ccontext->Next =
2789                                 cpu_to_le32(server->vals->create_lease_size);
2790                 }
2791
2792                 rc = add_durable_context(iov, &n_iov, oparms,
2793                                         tcon->use_persistent);
2794                 if (rc)
2795                         return rc;
2796         }
2797
2798         if (tcon->posix_extensions) {
2799                 if (n_iov > 2) {
2800                         struct create_context *ccontext =
2801                             (struct create_context *)iov[n_iov-1].iov_base;
2802                         ccontext->Next =
2803                                 cpu_to_le32(iov[n_iov-1].iov_len);
2804                 }
2805
2806                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2807                 if (rc)
2808                         return rc;
2809         }
2810
2811         if (tcon->snapshot_time) {
2812                 cifs_dbg(FYI, "adding snapshot context\n");
2813                 if (n_iov > 2) {
2814                         struct create_context *ccontext =
2815                             (struct create_context *)iov[n_iov-1].iov_base;
2816                         ccontext->Next =
2817                                 cpu_to_le32(iov[n_iov-1].iov_len);
2818                 }
2819
2820                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2821                 if (rc)
2822                         return rc;
2823         }
2824
2825         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2826                 bool set_mode;
2827                 bool set_owner;
2828
2829                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2830                     (oparms->mode != ACL_NO_MODE))
2831                         set_mode = true;
2832                 else {
2833                         set_mode = false;
2834                         oparms->mode = ACL_NO_MODE;
2835                 }
2836
2837                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2838                         set_owner = true;
2839                 else
2840                         set_owner = false;
2841
2842                 if (set_owner | set_mode) {
2843                         if (n_iov > 2) {
2844                                 struct create_context *ccontext =
2845                                     (struct create_context *)iov[n_iov-1].iov_base;
2846                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2847                         }
2848
2849                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2850                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2851                         if (rc)
2852                                 return rc;
2853                 }
2854         }
2855
2856         if (n_iov > 2) {
2857                 struct create_context *ccontext =
2858                         (struct create_context *)iov[n_iov-1].iov_base;
2859                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2860         }
2861         add_query_id_context(iov, &n_iov);
2862
2863         rqst->rq_nvec = n_iov;
2864         return 0;
2865 }
2866
2867 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2868  * All other vectors are freed by kfree().
2869  */
2870 void
2871 SMB2_open_free(struct smb_rqst *rqst)
2872 {
2873         int i;
2874
2875         if (rqst && rqst->rq_iov) {
2876                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2877                 for (i = 1; i < rqst->rq_nvec; i++)
2878                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2879                                 kfree(rqst->rq_iov[i].iov_base);
2880         }
2881 }
2882
2883 int
2884 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2885           __u8 *oplock, struct smb2_file_all_info *buf,
2886           struct create_posix_rsp *posix,
2887           struct kvec *err_iov, int *buftype)
2888 {
2889         struct smb_rqst rqst;
2890         struct smb2_create_rsp *rsp = NULL;
2891         struct cifs_tcon *tcon = oparms->tcon;
2892         struct cifs_ses *ses = tcon->ses;
2893         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2894         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2895         struct kvec rsp_iov = {NULL, 0};
2896         int resp_buftype = CIFS_NO_BUFFER;
2897         int rc = 0;
2898         int flags = 0;
2899
2900         cifs_dbg(FYI, "create/open\n");
2901         if (!ses || !server)
2902                 return -EIO;
2903
2904         if (smb3_encryption_required(tcon))
2905                 flags |= CIFS_TRANSFORM_REQ;
2906
2907         memset(&rqst, 0, sizeof(struct smb_rqst));
2908         memset(&iov, 0, sizeof(iov));
2909         rqst.rq_iov = iov;
2910         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2911
2912         rc = SMB2_open_init(tcon, server,
2913                             &rqst, oplock, oparms, path);
2914         if (rc)
2915                 goto creat_exit;
2916
2917         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2918                 oparms->create_options, oparms->desired_access);
2919
2920         rc = cifs_send_recv(xid, ses, server,
2921                             &rqst, &resp_buftype, flags,
2922                             &rsp_iov);
2923         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2924
2925         if (rc != 0) {
2926                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2927                 if (err_iov && rsp) {
2928                         *err_iov = rsp_iov;
2929                         *buftype = resp_buftype;
2930                         resp_buftype = CIFS_NO_BUFFER;
2931                         rsp = NULL;
2932                 }
2933                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2934                                     oparms->create_options, oparms->desired_access, rc);
2935                 if (rc == -EREMCHG) {
2936                         pr_warn_once("server share %s deleted\n",
2937                                      tcon->treeName);
2938                         tcon->need_reconnect = true;
2939                 }
2940                 goto creat_exit;
2941         } else
2942                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2943                                      ses->Suid, oparms->create_options,
2944                                      oparms->desired_access);
2945
2946         atomic_inc(&tcon->num_remote_opens);
2947         oparms->fid->persistent_fid = rsp->PersistentFileId;
2948         oparms->fid->volatile_fid = rsp->VolatileFileId;
2949         oparms->fid->access = oparms->desired_access;
2950 #ifdef CONFIG_CIFS_DEBUG2
2951         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2952 #endif /* CIFS_DEBUG2 */
2953
2954         if (buf) {
2955                 memcpy(buf, &rsp->CreationTime, 32);
2956                 buf->AllocationSize = rsp->AllocationSize;
2957                 buf->EndOfFile = rsp->EndofFile;
2958                 buf->Attributes = rsp->FileAttributes;
2959                 buf->NumberOfLinks = cpu_to_le32(1);
2960                 buf->DeletePending = 0;
2961         }
2962
2963
2964         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2965                             oparms->fid->lease_key, oplock, buf, posix);
2966 creat_exit:
2967         SMB2_open_free(&rqst);
2968         free_rsp_buf(resp_buftype, rsp);
2969         return rc;
2970 }
2971
2972 int
2973 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2974                 struct smb_rqst *rqst,
2975                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2976                 bool is_fsctl, char *in_data, u32 indatalen,
2977                 __u32 max_response_size)
2978 {
2979         struct smb2_ioctl_req *req;
2980         struct kvec *iov = rqst->rq_iov;
2981         unsigned int total_len;
2982         int rc;
2983         char *in_data_buf;
2984
2985         rc = smb2_ioctl_req_init(opcode, tcon, server,
2986                                  (void **) &req, &total_len);
2987         if (rc)
2988                 return rc;
2989
2990         if (indatalen) {
2991                 /*
2992                  * indatalen is usually small at a couple of bytes max, so
2993                  * just allocate through generic pool
2994                  */
2995                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2996                 if (!in_data_buf) {
2997                         cifs_small_buf_release(req);
2998                         return -ENOMEM;
2999                 }
3000         }
3001
3002         req->CtlCode = cpu_to_le32(opcode);
3003         req->PersistentFileId = persistent_fid;
3004         req->VolatileFileId = volatile_fid;
3005
3006         iov[0].iov_base = (char *)req;
3007         /*
3008          * If no input data, the size of ioctl struct in
3009          * protocol spec still includes a 1 byte data buffer,
3010          * but if input data passed to ioctl, we do not
3011          * want to double count this, so we do not send
3012          * the dummy one byte of data in iovec[0] if sending
3013          * input data (in iovec[1]).
3014          */
3015         if (indatalen) {
3016                 req->InputCount = cpu_to_le32(indatalen);
3017                 /* do not set InputOffset if no input data */
3018                 req->InputOffset =
3019                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3020                 rqst->rq_nvec = 2;
3021                 iov[0].iov_len = total_len - 1;
3022                 iov[1].iov_base = in_data_buf;
3023                 iov[1].iov_len = indatalen;
3024         } else {
3025                 rqst->rq_nvec = 1;
3026                 iov[0].iov_len = total_len;
3027         }
3028
3029         req->OutputOffset = 0;
3030         req->OutputCount = 0; /* MBZ */
3031
3032         /*
3033          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3034          * We Could increase default MaxOutputResponse, but that could require
3035          * more credits. Windows typically sets this smaller, but for some
3036          * ioctls it may be useful to allow server to send more. No point
3037          * limiting what the server can send as long as fits in one credit
3038          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3039          * to increase this limit up in the future.
3040          * Note that for snapshot queries that servers like Azure expect that
3041          * the first query be minimal size (and just used to get the number/size
3042          * of previous versions) so response size must be specified as EXACTLY
3043          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3044          * of eight bytes.  Currently that is the only case where we set max
3045          * response size smaller.
3046          */
3047         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3048         req->sync_hdr.CreditCharge =
3049                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3050                                          SMB2_MAX_BUFFER_SIZE));
3051         if (is_fsctl)
3052                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3053         else
3054                 req->Flags = 0;
3055
3056         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3057         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3058                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
3059
3060         return 0;
3061 }
3062
3063 void
3064 SMB2_ioctl_free(struct smb_rqst *rqst)
3065 {
3066         int i;
3067         if (rqst && rqst->rq_iov) {
3068                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3069                 for (i = 1; i < rqst->rq_nvec; i++)
3070                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3071                                 kfree(rqst->rq_iov[i].iov_base);
3072         }
3073 }
3074
3075
3076 /*
3077  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3078  */
3079 int
3080 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3081            u64 volatile_fid, u32 opcode, bool is_fsctl,
3082            char *in_data, u32 indatalen, u32 max_out_data_len,
3083            char **out_data, u32 *plen /* returned data len */)
3084 {
3085         struct smb_rqst rqst;
3086         struct smb2_ioctl_rsp *rsp = NULL;
3087         struct cifs_ses *ses;
3088         struct TCP_Server_Info *server;
3089         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3090         struct kvec rsp_iov = {NULL, 0};
3091         int resp_buftype = CIFS_NO_BUFFER;
3092         int rc = 0;
3093         int flags = 0;
3094
3095         cifs_dbg(FYI, "SMB2 IOCTL\n");
3096
3097         if (out_data != NULL)
3098                 *out_data = NULL;
3099
3100         /* zero out returned data len, in case of error */
3101         if (plen)
3102                 *plen = 0;
3103
3104         if (!tcon)
3105                 return -EIO;
3106
3107         ses = tcon->ses;
3108         if (!ses)
3109                 return -EIO;
3110
3111         server = cifs_pick_channel(ses);
3112         if (!server)
3113                 return -EIO;
3114
3115         if (smb3_encryption_required(tcon))
3116                 flags |= CIFS_TRANSFORM_REQ;
3117
3118         memset(&rqst, 0, sizeof(struct smb_rqst));
3119         memset(&iov, 0, sizeof(iov));
3120         rqst.rq_iov = iov;
3121         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3122
3123         rc = SMB2_ioctl_init(tcon, server,
3124                              &rqst, persistent_fid, volatile_fid, opcode,
3125                              is_fsctl, in_data, indatalen, max_out_data_len);
3126         if (rc)
3127                 goto ioctl_exit;
3128
3129         rc = cifs_send_recv(xid, ses, server,
3130                             &rqst, &resp_buftype, flags,
3131                             &rsp_iov);
3132         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3133
3134         if (rc != 0)
3135                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3136                                 ses->Suid, 0, opcode, rc);
3137
3138         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3139                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3140                 goto ioctl_exit;
3141         } else if (rc == -EINVAL) {
3142                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3143                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3144                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3145                         goto ioctl_exit;
3146                 }
3147         } else if (rc == -E2BIG) {
3148                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3149                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3150                         goto ioctl_exit;
3151                 }
3152         }
3153
3154         /* check if caller wants to look at return data or just return rc */
3155         if ((plen == NULL) || (out_data == NULL))
3156                 goto ioctl_exit;
3157
3158         *plen = le32_to_cpu(rsp->OutputCount);
3159
3160         /* We check for obvious errors in the output buffer length and offset */
3161         if (*plen == 0)
3162                 goto ioctl_exit; /* server returned no data */
3163         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3164                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3165                 *plen = 0;
3166                 rc = -EIO;
3167                 goto ioctl_exit;
3168         }
3169
3170         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3171                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3172                         le32_to_cpu(rsp->OutputOffset));
3173                 *plen = 0;
3174                 rc = -EIO;
3175                 goto ioctl_exit;
3176         }
3177
3178         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3179                             *plen, GFP_KERNEL);
3180         if (*out_data == NULL) {
3181                 rc = -ENOMEM;
3182                 goto ioctl_exit;
3183         }
3184
3185 ioctl_exit:
3186         SMB2_ioctl_free(&rqst);
3187         free_rsp_buf(resp_buftype, rsp);
3188         return rc;
3189 }
3190
3191 /*
3192  *   Individual callers to ioctl worker function follow
3193  */
3194
3195 int
3196 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3197                      u64 persistent_fid, u64 volatile_fid)
3198 {
3199         int rc;
3200         struct  compress_ioctl fsctl_input;
3201         char *ret_data = NULL;
3202
3203         fsctl_input.CompressionState =
3204                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3205
3206         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3207                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3208                         (char *)&fsctl_input /* data input */,
3209                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3210                         &ret_data /* out data */, NULL);
3211
3212         cifs_dbg(FYI, "set compression rc %d\n", rc);
3213
3214         return rc;
3215 }
3216
3217 int
3218 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3219                 struct smb_rqst *rqst,
3220                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3221 {
3222         struct smb2_close_req *req;
3223         struct kvec *iov = rqst->rq_iov;
3224         unsigned int total_len;
3225         int rc;
3226
3227         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3228                                  (void **) &req, &total_len);
3229         if (rc)
3230                 return rc;
3231
3232         req->PersistentFileId = persistent_fid;
3233         req->VolatileFileId = volatile_fid;
3234         if (query_attrs)
3235                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3236         else
3237                 req->Flags = 0;
3238         iov[0].iov_base = (char *)req;
3239         iov[0].iov_len = total_len;
3240
3241         return 0;
3242 }
3243
3244 void
3245 SMB2_close_free(struct smb_rqst *rqst)
3246 {
3247         if (rqst && rqst->rq_iov)
3248                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3249 }
3250
3251 int
3252 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3253              u64 persistent_fid, u64 volatile_fid,
3254              struct smb2_file_network_open_info *pbuf)
3255 {
3256         struct smb_rqst rqst;
3257         struct smb2_close_rsp *rsp = NULL;
3258         struct cifs_ses *ses = tcon->ses;
3259         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3260         struct kvec iov[1];
3261         struct kvec rsp_iov;
3262         int resp_buftype = CIFS_NO_BUFFER;
3263         int rc = 0;
3264         int flags = 0;
3265         bool query_attrs = false;
3266
3267         cifs_dbg(FYI, "Close\n");
3268
3269         if (!ses || !server)
3270                 return -EIO;
3271
3272         if (smb3_encryption_required(tcon))
3273                 flags |= CIFS_TRANSFORM_REQ;
3274
3275         memset(&rqst, 0, sizeof(struct smb_rqst));
3276         memset(&iov, 0, sizeof(iov));
3277         rqst.rq_iov = iov;
3278         rqst.rq_nvec = 1;
3279
3280         /* check if need to ask server to return timestamps in close response */
3281         if (pbuf)
3282                 query_attrs = true;
3283
3284         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3285         rc = SMB2_close_init(tcon, server,
3286                              &rqst, persistent_fid, volatile_fid,
3287                              query_attrs);
3288         if (rc)
3289                 goto close_exit;
3290
3291         rc = cifs_send_recv(xid, ses, server,
3292                             &rqst, &resp_buftype, flags, &rsp_iov);
3293         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3294
3295         if (rc != 0) {
3296                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3297                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3298                                      rc);
3299                 goto close_exit;
3300         } else {
3301                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3302                                       ses->Suid);
3303                 /*
3304                  * Note that have to subtract 4 since struct network_open_info
3305                  * has a final 4 byte pad that close response does not have
3306                  */
3307                 if (pbuf)
3308                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3309         }
3310
3311         atomic_dec(&tcon->num_remote_opens);
3312 close_exit:
3313         SMB2_close_free(&rqst);
3314         free_rsp_buf(resp_buftype, rsp);
3315
3316         /* retry close in a worker thread if this one is interrupted */
3317         if (rc == -EINTR) {
3318                 int tmp_rc;
3319
3320                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3321                                                      volatile_fid);
3322                 if (tmp_rc)
3323                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3324                                  persistent_fid, tmp_rc);
3325         }
3326         return rc;
3327 }
3328
3329 int
3330 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3331                 u64 persistent_fid, u64 volatile_fid)
3332 {
3333         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3334 }
3335
3336 int
3337 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3338                   struct kvec *iov, unsigned int min_buf_size)
3339 {
3340         unsigned int smb_len = iov->iov_len;
3341         char *end_of_smb = smb_len + (char *)iov->iov_base;
3342         char *begin_of_buf = offset + (char *)iov->iov_base;
3343         char *end_of_buf = begin_of_buf + buffer_length;
3344
3345
3346         if (buffer_length < min_buf_size) {
3347                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3348                          buffer_length, min_buf_size);
3349                 return -EINVAL;
3350         }
3351
3352         /* check if beyond RFC1001 maximum length */
3353         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3354                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3355                          buffer_length, smb_len);
3356                 return -EINVAL;
3357         }
3358
3359         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3360                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3361                 return -EINVAL;
3362         }
3363
3364         return 0;
3365 }
3366
3367 /*
3368  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3369  * Caller must free buffer.
3370  */
3371 int
3372 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3373                            struct kvec *iov, unsigned int minbufsize,
3374                            char *data)
3375 {
3376         char *begin_of_buf = offset + (char *)iov->iov_base;
3377         int rc;
3378
3379         if (!data)
3380                 return -EINVAL;
3381
3382         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3383         if (rc)
3384                 return rc;
3385
3386         memcpy(data, begin_of_buf, buffer_length);
3387
3388         return 0;
3389 }
3390
3391 int
3392 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3393                      struct smb_rqst *rqst,
3394                      u64 persistent_fid, u64 volatile_fid,
3395                      u8 info_class, u8 info_type, u32 additional_info,
3396                      size_t output_len, size_t input_len, void *input)
3397 {
3398         struct smb2_query_info_req *req;
3399         struct kvec *iov = rqst->rq_iov;
3400         unsigned int total_len;
3401         int rc;
3402
3403         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3404                                  (void **) &req, &total_len);
3405         if (rc)
3406                 return rc;
3407
3408         req->InfoType = info_type;
3409         req->FileInfoClass = info_class;
3410         req->PersistentFileId = persistent_fid;
3411         req->VolatileFileId = volatile_fid;
3412         req->AdditionalInformation = cpu_to_le32(additional_info);
3413
3414         req->OutputBufferLength = cpu_to_le32(output_len);
3415         if (input_len) {
3416                 req->InputBufferLength = cpu_to_le32(input_len);
3417                 /* total_len for smb query request never close to le16 max */
3418                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3419                 memcpy(req->Buffer, input, input_len);
3420         }
3421
3422         iov[0].iov_base = (char *)req;
3423         /* 1 for Buffer */
3424         iov[0].iov_len = total_len - 1 + input_len;
3425         return 0;
3426 }
3427
3428 void
3429 SMB2_query_info_free(struct smb_rqst *rqst)
3430 {
3431         if (rqst && rqst->rq_iov)
3432                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3433 }
3434
3435 static int
3436 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3437            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3438            u32 additional_info, size_t output_len, size_t min_len, void **data,
3439                 u32 *dlen)
3440 {
3441         struct smb_rqst rqst;
3442         struct smb2_query_info_rsp *rsp = NULL;
3443         struct kvec iov[1];
3444         struct kvec rsp_iov;
3445         int rc = 0;
3446         int resp_buftype = CIFS_NO_BUFFER;
3447         struct cifs_ses *ses = tcon->ses;
3448         struct TCP_Server_Info *server;
3449         int flags = 0;
3450         bool allocated = false;
3451
3452         cifs_dbg(FYI, "Query Info\n");
3453
3454         if (!ses)
3455                 return -EIO;
3456         server = cifs_pick_channel(ses);
3457         if (!server)
3458                 return -EIO;
3459
3460         if (smb3_encryption_required(tcon))
3461                 flags |= CIFS_TRANSFORM_REQ;
3462
3463         memset(&rqst, 0, sizeof(struct smb_rqst));
3464         memset(&iov, 0, sizeof(iov));
3465         rqst.rq_iov = iov;
3466         rqst.rq_nvec = 1;
3467
3468         rc = SMB2_query_info_init(tcon, server,
3469                                   &rqst, persistent_fid, volatile_fid,
3470                                   info_class, info_type, additional_info,
3471                                   output_len, 0, NULL);
3472         if (rc)
3473                 goto qinf_exit;
3474
3475         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3476                                     ses->Suid, info_class, (__u32)info_type);
3477
3478         rc = cifs_send_recv(xid, ses, server,
3479                             &rqst, &resp_buftype, flags, &rsp_iov);
3480         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3481
3482         if (rc) {
3483                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3484                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3485                                 ses->Suid, info_class, (__u32)info_type, rc);
3486                 goto qinf_exit;
3487         }
3488
3489         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3490                                 ses->Suid, info_class, (__u32)info_type);
3491
3492         if (dlen) {
3493                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3494                 if (!*data) {
3495                         *data = kmalloc(*dlen, GFP_KERNEL);
3496                         if (!*data) {
3497                                 cifs_tcon_dbg(VFS,
3498                                         "Error %d allocating memory for acl\n",
3499                                         rc);
3500                                 *dlen = 0;
3501                                 rc = -ENOMEM;
3502                                 goto qinf_exit;
3503                         }
3504                         allocated = true;
3505                 }
3506         }
3507
3508         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3509                                         le32_to_cpu(rsp->OutputBufferLength),
3510                                         &rsp_iov, min_len, *data);
3511         if (rc && allocated) {
3512                 kfree(*data);
3513                 *data = NULL;
3514                 *dlen = 0;
3515         }
3516
3517 qinf_exit:
3518         SMB2_query_info_free(&rqst);
3519         free_rsp_buf(resp_buftype, rsp);
3520         return rc;
3521 }
3522
3523 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3524         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3525 {
3526         return query_info(xid, tcon, persistent_fid, volatile_fid,
3527                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3528                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3529                           sizeof(struct smb2_file_all_info), (void **)&data,
3530                           NULL);
3531 }
3532
3533 int
3534 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3535                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3536 {
3537         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3538                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3539         *plen = 0;
3540
3541         return query_info(xid, tcon, persistent_fid, volatile_fid,
3542                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3543                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3544 }
3545
3546 int
3547 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3548                 u64 persistent_fid, u64 volatile_fid,
3549                 void **data, u32 *plen)
3550 {
3551         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3552         *plen = 0;
3553
3554         return query_info(xid, tcon, persistent_fid, volatile_fid,
3555                           0, SMB2_O_INFO_SECURITY, additional_info,
3556                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3557 }
3558
3559 int
3560 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3561                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3562 {
3563         return query_info(xid, tcon, persistent_fid, volatile_fid,
3564                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3565                           sizeof(struct smb2_file_internal_info),
3566                           sizeof(struct smb2_file_internal_info),
3567                           (void **)&uniqueid, NULL);
3568 }
3569
3570 /*
3571  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3572  * See MS-SMB2 2.2.35 and 2.2.36
3573  */
3574
3575 static int
3576 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3577                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3578                  u64 persistent_fid, u64 volatile_fid,
3579                  u32 completion_filter, bool watch_tree)
3580 {
3581         struct smb2_change_notify_req *req;
3582         struct kvec *iov = rqst->rq_iov;
3583         unsigned int total_len;
3584         int rc;
3585
3586         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3587                                  (void **) &req, &total_len);
3588         if (rc)
3589                 return rc;
3590
3591         req->PersistentFileId = persistent_fid;
3592         req->VolatileFileId = volatile_fid;
3593         /* See note 354 of MS-SMB2, 64K max */
3594         req->OutputBufferLength =
3595                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3596         req->CompletionFilter = cpu_to_le32(completion_filter);
3597         if (watch_tree)
3598                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3599         else
3600                 req->Flags = 0;
3601
3602         iov[0].iov_base = (char *)req;
3603         iov[0].iov_len = total_len;
3604
3605         return 0;
3606 }
3607
3608 int
3609 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3610                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3611                 u32 completion_filter)
3612 {
3613         struct cifs_ses *ses = tcon->ses;
3614         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3615         struct smb_rqst rqst;
3616         struct kvec iov[1];
3617         struct kvec rsp_iov = {NULL, 0};
3618         int resp_buftype = CIFS_NO_BUFFER;
3619         int flags = 0;
3620         int rc = 0;
3621
3622         cifs_dbg(FYI, "change notify\n");
3623         if (!ses || !server)
3624                 return -EIO;
3625
3626         if (smb3_encryption_required(tcon))
3627                 flags |= CIFS_TRANSFORM_REQ;
3628
3629         memset(&rqst, 0, sizeof(struct smb_rqst));
3630         memset(&iov, 0, sizeof(iov));
3631         rqst.rq_iov = iov;
3632         rqst.rq_nvec = 1;
3633
3634         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3635                               persistent_fid, volatile_fid,
3636                               completion_filter, watch_tree);
3637         if (rc)
3638                 goto cnotify_exit;
3639
3640         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3641                                 (u8)watch_tree, completion_filter);
3642         rc = cifs_send_recv(xid, ses, server,
3643                             &rqst, &resp_buftype, flags, &rsp_iov);
3644
3645         if (rc != 0) {
3646                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3647                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3648                                 (u8)watch_tree, completion_filter, rc);
3649         } else
3650                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3651                                 ses->Suid, (u8)watch_tree, completion_filter);
3652
3653  cnotify_exit:
3654         if (rqst.rq_iov)
3655                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3656         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3657         return rc;
3658 }
3659
3660
3661
3662 /*
3663  * This is a no-op for now. We're not really interested in the reply, but
3664  * rather in the fact that the server sent one and that server->lstrp
3665  * gets updated.
3666  *
3667  * FIXME: maybe we should consider checking that the reply matches request?
3668  */
3669 static void
3670 smb2_echo_callback(struct mid_q_entry *mid)
3671 {
3672         struct TCP_Server_Info *server = mid->callback_data;
3673         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3674         struct cifs_credits credits = { .value = 0, .instance = 0 };
3675
3676         if (mid->mid_state == MID_RESPONSE_RECEIVED
3677             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3678                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3679                 credits.instance = server->reconnect_instance;
3680         }
3681
3682         DeleteMidQEntry(mid);
3683         add_credits(server, &credits, CIFS_ECHO_OP);
3684 }
3685
3686 void smb2_reconnect_server(struct work_struct *work)
3687 {
3688         struct TCP_Server_Info *server = container_of(work,
3689                                         struct TCP_Server_Info, reconnect.work);
3690         struct cifs_ses *ses;
3691         struct cifs_tcon *tcon, *tcon2;
3692         struct list_head tmp_list;
3693         int tcon_exist = false;
3694         int rc;
3695         int resched = false;
3696
3697
3698         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3699         mutex_lock(&server->reconnect_mutex);
3700
3701         INIT_LIST_HEAD(&tmp_list);
3702         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3703
3704         spin_lock(&cifs_tcp_ses_lock);
3705         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3706                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3707                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3708                                 tcon->tc_count++;
3709                                 list_add_tail(&tcon->rlist, &tmp_list);
3710                                 tcon_exist = true;
3711                         }
3712                 }
3713                 /*
3714                  * IPC has the same lifetime as its session and uses its
3715                  * refcount.
3716                  */
3717                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3718                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3719                         tcon_exist = true;
3720                         ses->ses_count++;
3721                 }
3722         }
3723         /*
3724          * Get the reference to server struct to be sure that the last call of
3725          * cifs_put_tcon() in the loop below won't release the server pointer.
3726          */
3727         if (tcon_exist)
3728                 server->srv_count++;
3729
3730         spin_unlock(&cifs_tcp_ses_lock);
3731
3732         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3733                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3734                 if (!rc)
3735                         cifs_reopen_persistent_handles(tcon);
3736                 else
3737                         resched = true;
3738                 list_del_init(&tcon->rlist);
3739                 if (tcon->ipc)
3740                         cifs_put_smb_ses(tcon->ses);
3741                 else
3742                         cifs_put_tcon(tcon);
3743         }
3744
3745         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3746         if (resched)
3747                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3748         mutex_unlock(&server->reconnect_mutex);
3749
3750         /* now we can safely release srv struct */
3751         if (tcon_exist)
3752                 cifs_put_tcp_session(server, 1);
3753 }
3754
3755 int
3756 SMB2_echo(struct TCP_Server_Info *server)
3757 {
3758         struct smb2_echo_req *req;
3759         int rc = 0;
3760         struct kvec iov[1];
3761         struct smb_rqst rqst = { .rq_iov = iov,
3762                                  .rq_nvec = 1 };
3763         unsigned int total_len;
3764
3765         cifs_dbg(FYI, "In echo request\n");
3766
3767         if (server->tcpStatus == CifsNeedNegotiate) {
3768                 /* No need to send echo on newly established connections */
3769                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3770                 return rc;
3771         }
3772
3773         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3774                                  (void **)&req, &total_len);
3775         if (rc)
3776                 return rc;
3777
3778         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3779
3780         iov[0].iov_len = total_len;
3781         iov[0].iov_base = (char *)req;
3782
3783         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3784                              server, CIFS_ECHO_OP, NULL);
3785         if (rc)
3786                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3787
3788         cifs_small_buf_release(req);
3789         return rc;
3790 }
3791
3792 void
3793 SMB2_flush_free(struct smb_rqst *rqst)
3794 {
3795         if (rqst && rqst->rq_iov)
3796                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3797 }
3798
3799 int
3800 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3801                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3802                 u64 persistent_fid, u64 volatile_fid)
3803 {
3804         struct smb2_flush_req *req;
3805         struct kvec *iov = rqst->rq_iov;
3806         unsigned int total_len;
3807         int rc;
3808
3809         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3810                                  (void **) &req, &total_len);
3811         if (rc)
3812                 return rc;
3813
3814         req->PersistentFileId = persistent_fid;
3815         req->VolatileFileId = volatile_fid;
3816
3817         iov[0].iov_base = (char *)req;
3818         iov[0].iov_len = total_len;
3819
3820         return 0;
3821 }
3822
3823 int
3824 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3825            u64 volatile_fid)
3826 {
3827         struct cifs_ses *ses = tcon->ses;
3828         struct smb_rqst rqst;
3829         struct kvec iov[1];
3830         struct kvec rsp_iov = {NULL, 0};
3831         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3832         int resp_buftype = CIFS_NO_BUFFER;
3833         int flags = 0;
3834         int rc = 0;
3835
3836         cifs_dbg(FYI, "flush\n");
3837         if (!ses || !(ses->server))
3838                 return -EIO;
3839
3840         if (smb3_encryption_required(tcon))
3841                 flags |= CIFS_TRANSFORM_REQ;
3842
3843         memset(&rqst, 0, sizeof(struct smb_rqst));
3844         memset(&iov, 0, sizeof(iov));
3845         rqst.rq_iov = iov;
3846         rqst.rq_nvec = 1;
3847
3848         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3849                              persistent_fid, volatile_fid);
3850         if (rc)
3851                 goto flush_exit;
3852
3853         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3854         rc = cifs_send_recv(xid, ses, server,
3855                             &rqst, &resp_buftype, flags, &rsp_iov);
3856
3857         if (rc != 0) {
3858                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3859                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3860                                      rc);
3861         } else
3862                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3863                                       ses->Suid);
3864
3865  flush_exit:
3866         SMB2_flush_free(&rqst);
3867         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3868         return rc;
3869 }
3870
3871 /*
3872  * To form a chain of read requests, any read requests after the first should
3873  * have the end_of_chain boolean set to true.
3874  */
3875 static int
3876 smb2_new_read_req(void **buf, unsigned int *total_len,
3877         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3878         unsigned int remaining_bytes, int request_type)
3879 {
3880         int rc = -EACCES;
3881         struct smb2_read_plain_req *req = NULL;
3882         struct smb2_sync_hdr *shdr;
3883         struct TCP_Server_Info *server = io_parms->server;
3884
3885         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3886                                  (void **) &req, total_len);
3887         if (rc)
3888                 return rc;
3889
3890         if (server == NULL)
3891                 return -ECONNABORTED;
3892
3893         shdr = &req->sync_hdr;
3894         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3895
3896         req->PersistentFileId = io_parms->persistent_fid;
3897         req->VolatileFileId = io_parms->volatile_fid;
3898         req->ReadChannelInfoOffset = 0; /* reserved */
3899         req->ReadChannelInfoLength = 0; /* reserved */
3900         req->Channel = 0; /* reserved */
3901         req->MinimumCount = 0;
3902         req->Length = cpu_to_le32(io_parms->length);
3903         req->Offset = cpu_to_le64(io_parms->offset);
3904
3905         trace_smb3_read_enter(0 /* xid */,
3906                         io_parms->persistent_fid,
3907                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3908                         io_parms->offset, io_parms->length);
3909 #ifdef CONFIG_CIFS_SMB_DIRECT
3910         /*
3911          * If we want to do a RDMA write, fill in and append
3912          * smbd_buffer_descriptor_v1 to the end of read request
3913          */
3914         if (server->rdma && rdata && !server->sign &&
3915                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3916
3917                 struct smbd_buffer_descriptor_v1 *v1;
3918                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3919
3920                 rdata->mr = smbd_register_mr(
3921                                 server->smbd_conn, rdata->pages,
3922                                 rdata->nr_pages, rdata->page_offset,
3923                                 rdata->tailsz, true, need_invalidate);
3924                 if (!rdata->mr)
3925                         return -EAGAIN;
3926
3927                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3928                 if (need_invalidate)
3929                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3930                 req->ReadChannelInfoOffset =
3931                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3932                 req->ReadChannelInfoLength =
3933                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3934                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3935                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3936                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3937                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3938
3939                 *total_len += sizeof(*v1) - 1;
3940         }
3941 #endif
3942         if (request_type & CHAINED_REQUEST) {
3943                 if (!(request_type & END_OF_CHAIN)) {
3944                         /* next 8-byte aligned request */
3945                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3946                         shdr->NextCommand = cpu_to_le32(*total_len);
3947                 } else /* END_OF_CHAIN */
3948                         shdr->NextCommand = 0;
3949                 if (request_type & RELATED_REQUEST) {
3950                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3951                         /*
3952                          * Related requests use info from previous read request
3953                          * in chain.
3954                          */
3955                         shdr->SessionId = 0xFFFFFFFF;
3956                         shdr->TreeId = 0xFFFFFFFF;
3957                         req->PersistentFileId = 0xFFFFFFFF;
3958                         req->VolatileFileId = 0xFFFFFFFF;
3959                 }
3960         }
3961         if (remaining_bytes > io_parms->length)
3962                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3963         else
3964                 req->RemainingBytes = 0;
3965
3966         *buf = req;
3967         return rc;
3968 }
3969
3970 static void
3971 smb2_readv_callback(struct mid_q_entry *mid)
3972 {
3973         struct cifs_readdata *rdata = mid->callback_data;
3974         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3975         struct TCP_Server_Info *server = rdata->server;
3976         struct smb2_sync_hdr *shdr =
3977                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3978         struct cifs_credits credits = { .value = 0, .instance = 0 };
3979         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3980                                  .rq_nvec = 1,
3981                                  .rq_pages = rdata->pages,
3982                                  .rq_offset = rdata->page_offset,
3983                                  .rq_npages = rdata->nr_pages,
3984                                  .rq_pagesz = rdata->pagesz,
3985                                  .rq_tailsz = rdata->tailsz };
3986
3987         WARN_ONCE(rdata->server != mid->server,
3988                   "rdata server %p != mid server %p",
3989                   rdata->server, mid->server);
3990
3991         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3992                  __func__, mid->mid, mid->mid_state, rdata->result,
3993                  rdata->bytes);
3994
3995         switch (mid->mid_state) {
3996         case MID_RESPONSE_RECEIVED:
3997                 credits.value = le16_to_cpu(shdr->CreditRequest);
3998                 credits.instance = server->reconnect_instance;
3999                 /* result already set, check signature */
4000                 if (server->sign && !mid->decrypted) {
4001                         int rc;
4002
4003                         rc = smb2_verify_signature(&rqst, server);
4004                         if (rc)
4005                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4006                                          rc);
4007                 }
4008                 /* FIXME: should this be counted toward the initiating task? */
4009                 task_io_account_read(rdata->got_bytes);
4010                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4011                 break;
4012         case MID_REQUEST_SUBMITTED:
4013         case MID_RETRY_NEEDED:
4014                 rdata->result = -EAGAIN;
4015                 if (server->sign && rdata->got_bytes)
4016                         /* reset bytes number since we can not check a sign */
4017                         rdata->got_bytes = 0;
4018                 /* FIXME: should this be counted toward the initiating task? */
4019                 task_io_account_read(rdata->got_bytes);
4020                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4021                 break;
4022         case MID_RESPONSE_MALFORMED:
4023                 credits.value = le16_to_cpu(shdr->CreditRequest);
4024                 credits.instance = server->reconnect_instance;
4025                 /* fall through */
4026         default:
4027                 rdata->result = -EIO;
4028         }
4029 #ifdef CONFIG_CIFS_SMB_DIRECT
4030         /*
4031          * If this rdata has a memmory registered, the MR can be freed
4032          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4033          * because they have limited number and are used for future I/Os
4034          */
4035         if (rdata->mr) {
4036                 smbd_deregister_mr(rdata->mr);
4037                 rdata->mr = NULL;
4038         }
4039 #endif
4040         if (rdata->result && rdata->result != -ENODATA) {
4041                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4042                 trace_smb3_read_err(0 /* xid */,
4043                                     rdata->cfile->fid.persistent_fid,
4044                                     tcon->tid, tcon->ses->Suid, rdata->offset,
4045                                     rdata->bytes, rdata->result);
4046         } else
4047                 trace_smb3_read_done(0 /* xid */,
4048                                      rdata->cfile->fid.persistent_fid,
4049                                      tcon->tid, tcon->ses->Suid,
4050                                      rdata->offset, rdata->got_bytes);
4051
4052         queue_work(cifsiod_wq, &rdata->work);
4053         DeleteMidQEntry(mid);
4054         add_credits(server, &credits, 0);
4055 }
4056
4057 /* smb2_async_readv - send an async read, and set up mid to handle result */
4058 int
4059 smb2_async_readv(struct cifs_readdata *rdata)
4060 {
4061         int rc, flags = 0;
4062         char *buf;
4063         struct smb2_sync_hdr *shdr;
4064         struct cifs_io_parms io_parms;
4065         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4066                                  .rq_nvec = 1 };
4067         struct TCP_Server_Info *server;
4068         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4069         unsigned int total_len;
4070
4071         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4072                  __func__, rdata->offset, rdata->bytes);
4073
4074         if (!rdata->server)
4075                 rdata->server = cifs_pick_channel(tcon->ses);
4076
4077         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4078         io_parms.server = server = rdata->server;
4079         io_parms.offset = rdata->offset;
4080         io_parms.length = rdata->bytes;
4081         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4082         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4083         io_parms.pid = rdata->pid;
4084
4085         rc = smb2_new_read_req(
4086                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4087         if (rc)
4088                 return rc;
4089
4090         if (smb3_encryption_required(io_parms.tcon))
4091                 flags |= CIFS_TRANSFORM_REQ;
4092
4093         rdata->iov[0].iov_base = buf;
4094         rdata->iov[0].iov_len = total_len;
4095
4096         shdr = (struct smb2_sync_hdr *)buf;
4097
4098         if (rdata->credits.value > 0) {
4099                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4100                                                 SMB2_MAX_BUFFER_SIZE));
4101                 shdr->CreditRequest =
4102                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4103
4104                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4105                 if (rc)
4106                         goto async_readv_out;
4107
4108                 flags |= CIFS_HAS_CREDITS;
4109         }
4110
4111         kref_get(&rdata->refcount);
4112         rc = cifs_call_async(server, &rqst,
4113                              cifs_readv_receive, smb2_readv_callback,
4114                              smb3_handle_read_data, rdata, flags,
4115                              &rdata->credits);
4116         if (rc) {
4117                 kref_put(&rdata->refcount, cifs_readdata_release);
4118                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4119                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4120                                     io_parms.tcon->tid,
4121                                     io_parms.tcon->ses->Suid,
4122                                     io_parms.offset, io_parms.length, rc);
4123         }
4124
4125 async_readv_out:
4126         cifs_small_buf_release(buf);
4127         return rc;
4128 }
4129
4130 int
4131 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4132           unsigned int *nbytes, char **buf, int *buf_type)
4133 {
4134         struct smb_rqst rqst;
4135         int resp_buftype, rc;
4136         struct smb2_read_plain_req *req = NULL;
4137         struct smb2_read_rsp *rsp = NULL;
4138         struct kvec iov[1];
4139         struct kvec rsp_iov;
4140         unsigned int total_len;
4141         int flags = CIFS_LOG_ERROR;
4142         struct cifs_ses *ses = io_parms->tcon->ses;
4143
4144         if (!io_parms->server)
4145                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4146
4147         *nbytes = 0;
4148         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4149         if (rc)
4150                 return rc;
4151
4152         if (smb3_encryption_required(io_parms->tcon))
4153                 flags |= CIFS_TRANSFORM_REQ;
4154
4155         iov[0].iov_base = (char *)req;
4156         iov[0].iov_len = total_len;
4157
4158         memset(&rqst, 0, sizeof(struct smb_rqst));
4159         rqst.rq_iov = iov;
4160         rqst.rq_nvec = 1;
4161
4162         rc = cifs_send_recv(xid, ses, io_parms->server,
4163                             &rqst, &resp_buftype, flags, &rsp_iov);
4164         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4165
4166         if (rc) {
4167                 if (rc != -ENODATA) {
4168                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4169                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4170                         trace_smb3_read_err(xid, req->PersistentFileId,
4171                                             io_parms->tcon->tid, ses->Suid,
4172                                             io_parms->offset, io_parms->length,
4173                                             rc);
4174                 } else
4175                         trace_smb3_read_done(xid, req->PersistentFileId,
4176                                     io_parms->tcon->tid, ses->Suid,
4177                                     io_parms->offset, 0);
4178                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4179                 cifs_small_buf_release(req);
4180                 return rc == -ENODATA ? 0 : rc;
4181         } else
4182                 trace_smb3_read_done(xid, req->PersistentFileId,
4183                                     io_parms->tcon->tid, ses->Suid,
4184                                     io_parms->offset, io_parms->length);
4185
4186         cifs_small_buf_release(req);
4187
4188         *nbytes = le32_to_cpu(rsp->DataLength);
4189         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4190             (*nbytes > io_parms->length)) {
4191                 cifs_dbg(FYI, "bad length %d for count %d\n",
4192                          *nbytes, io_parms->length);
4193                 rc = -EIO;
4194                 *nbytes = 0;
4195         }
4196
4197         if (*buf) {
4198                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4199                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4200         } else if (resp_buftype != CIFS_NO_BUFFER) {
4201                 *buf = rsp_iov.iov_base;
4202                 if (resp_buftype == CIFS_SMALL_BUFFER)
4203                         *buf_type = CIFS_SMALL_BUFFER;
4204                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4205                         *buf_type = CIFS_LARGE_BUFFER;
4206         }
4207         return rc;
4208 }
4209
4210 /*
4211  * Check the mid_state and signature on received buffer (if any), and queue the
4212  * workqueue completion task.
4213  */
4214 static void
4215 smb2_writev_callback(struct mid_q_entry *mid)
4216 {
4217         struct cifs_writedata *wdata = mid->callback_data;
4218         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4219         struct TCP_Server_Info *server = wdata->server;
4220         unsigned int written;
4221         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4222         struct cifs_credits credits = { .value = 0, .instance = 0 };
4223
4224         WARN_ONCE(wdata->server != mid->server,
4225                   "wdata server %p != mid server %p",
4226                   wdata->server, mid->server);
4227
4228         switch (mid->mid_state) {
4229         case MID_RESPONSE_RECEIVED:
4230                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4231                 credits.instance = server->reconnect_instance;
4232                 wdata->result = smb2_check_receive(mid, server, 0);
4233                 if (wdata->result != 0)
4234                         break;
4235
4236                 written = le32_to_cpu(rsp->DataLength);
4237                 /*
4238                  * Mask off high 16 bits when bytes written as returned
4239                  * by the server is greater than bytes requested by the
4240                  * client. OS/2 servers are known to set incorrect
4241                  * CountHigh values.
4242                  */
4243                 if (written > wdata->bytes)
4244                         written &= 0xFFFF;
4245
4246                 if (written < wdata->bytes)
4247                         wdata->result = -ENOSPC;
4248                 else
4249                         wdata->bytes = written;
4250                 break;
4251         case MID_REQUEST_SUBMITTED:
4252         case MID_RETRY_NEEDED:
4253                 wdata->result = -EAGAIN;
4254                 break;
4255         case MID_RESPONSE_MALFORMED:
4256                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4257                 credits.instance = server->reconnect_instance;
4258                 /* fall through */
4259         default:
4260                 wdata->result = -EIO;
4261                 break;
4262         }
4263 #ifdef CONFIG_CIFS_SMB_DIRECT
4264         /*
4265          * If this wdata has a memory registered, the MR can be freed
4266          * The number of MRs available is limited, it's important to recover
4267          * used MR as soon as I/O is finished. Hold MR longer in the later
4268          * I/O process can possibly result in I/O deadlock due to lack of MR
4269          * to send request on I/O retry
4270          */
4271         if (wdata->mr) {
4272                 smbd_deregister_mr(wdata->mr);
4273                 wdata->mr = NULL;
4274         }
4275 #endif
4276         if (wdata->result) {
4277                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4278                 trace_smb3_write_err(0 /* no xid */,
4279                                      wdata->cfile->fid.persistent_fid,
4280                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4281                                      wdata->bytes, wdata->result);
4282                 if (wdata->result == -ENOSPC)
4283                         pr_warn_once("Out of space writing to %s\n",
4284                                      tcon->treeName);
4285         } else
4286                 trace_smb3_write_done(0 /* no xid */,
4287                                       wdata->cfile->fid.persistent_fid,
4288                                       tcon->tid, tcon->ses->Suid,
4289                                       wdata->offset, wdata->bytes);
4290
4291         queue_work(cifsiod_wq, &wdata->work);
4292         DeleteMidQEntry(mid);
4293         add_credits(server, &credits, 0);
4294 }
4295
4296 /* smb2_async_writev - send an async write, and set up mid to handle result */
4297 int
4298 smb2_async_writev(struct cifs_writedata *wdata,
4299                   void (*release)(struct kref *kref))
4300 {
4301         int rc = -EACCES, flags = 0;
4302         struct smb2_write_req *req = NULL;
4303         struct smb2_sync_hdr *shdr;
4304         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4305         struct TCP_Server_Info *server = wdata->server;
4306         struct kvec iov[1];
4307         struct smb_rqst rqst = { };
4308         unsigned int total_len;
4309
4310         if (!wdata->server)
4311                 server = wdata->server = cifs_pick_channel(tcon->ses);
4312
4313         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4314                                  (void **) &req, &total_len);
4315         if (rc)
4316                 return rc;
4317
4318         if (smb3_encryption_required(tcon))
4319                 flags |= CIFS_TRANSFORM_REQ;
4320
4321         shdr = (struct smb2_sync_hdr *)req;
4322         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4323
4324         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4325         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4326         req->WriteChannelInfoOffset = 0;
4327         req->WriteChannelInfoLength = 0;
4328         req->Channel = 0;
4329         req->Offset = cpu_to_le64(wdata->offset);
4330         req->DataOffset = cpu_to_le16(
4331                                 offsetof(struct smb2_write_req, Buffer));
4332         req->RemainingBytes = 0;
4333
4334         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4335                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4336 #ifdef CONFIG_CIFS_SMB_DIRECT
4337         /*
4338          * If we want to do a server RDMA read, fill in and append
4339          * smbd_buffer_descriptor_v1 to the end of write request
4340          */
4341         if (server->rdma && !server->sign && wdata->bytes >=
4342                 server->smbd_conn->rdma_readwrite_threshold) {
4343
4344                 struct smbd_buffer_descriptor_v1 *v1;
4345                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4346
4347                 wdata->mr = smbd_register_mr(
4348                                 server->smbd_conn, wdata->pages,
4349                                 wdata->nr_pages, wdata->page_offset,
4350                                 wdata->tailsz, false, need_invalidate);
4351                 if (!wdata->mr) {
4352                         rc = -EAGAIN;
4353                         goto async_writev_out;
4354                 }
4355                 req->Length = 0;
4356                 req->DataOffset = 0;
4357                 if (wdata->nr_pages > 1)
4358                         req->RemainingBytes =
4359                                 cpu_to_le32(
4360                                         (wdata->nr_pages - 1) * wdata->pagesz -
4361                                         wdata->page_offset + wdata->tailsz
4362                                 );
4363                 else
4364                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4365                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4366                 if (need_invalidate)
4367                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4368                 req->WriteChannelInfoOffset =
4369                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4370                 req->WriteChannelInfoLength =
4371                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4372                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4373                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4374                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4375                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4376         }
4377 #endif
4378         iov[0].iov_len = total_len - 1;
4379         iov[0].iov_base = (char *)req;
4380
4381         rqst.rq_iov = iov;
4382         rqst.rq_nvec = 1;
4383         rqst.rq_pages = wdata->pages;
4384         rqst.rq_offset = wdata->page_offset;
4385         rqst.rq_npages = wdata->nr_pages;
4386         rqst.rq_pagesz = wdata->pagesz;
4387         rqst.rq_tailsz = wdata->tailsz;
4388 #ifdef CONFIG_CIFS_SMB_DIRECT
4389         if (wdata->mr) {
4390                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4391                 rqst.rq_npages = 0;
4392         }
4393 #endif
4394         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4395                  wdata->offset, wdata->bytes);
4396
4397 #ifdef CONFIG_CIFS_SMB_DIRECT
4398         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4399         if (!wdata->mr)
4400                 req->Length = cpu_to_le32(wdata->bytes);
4401 #else
4402         req->Length = cpu_to_le32(wdata->bytes);
4403 #endif
4404
4405         if (wdata->credits.value > 0) {
4406                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4407                                                     SMB2_MAX_BUFFER_SIZE));
4408                 shdr->CreditRequest =
4409                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4410
4411                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4412                 if (rc)
4413                         goto async_writev_out;
4414
4415                 flags |= CIFS_HAS_CREDITS;
4416         }
4417
4418         kref_get(&wdata->refcount);
4419         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4420                              wdata, flags, &wdata->credits);
4421
4422         if (rc) {
4423                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4424                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4425                                      wdata->bytes, rc);
4426                 kref_put(&wdata->refcount, release);
4427                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4428         }
4429
4430 async_writev_out:
4431         cifs_small_buf_release(req);
4432         return rc;
4433 }
4434
4435 /*
4436  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4437  * The length field from io_parms must be at least 1 and indicates a number of
4438  * elements with data to write that begins with position 1 in iov array. All
4439  * data length is specified by count.
4440  */
4441 int
4442 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4443            unsigned int *nbytes, struct kvec *iov, int n_vec)
4444 {
4445         struct smb_rqst rqst;
4446         int rc = 0;
4447         struct smb2_write_req *req = NULL;
4448         struct smb2_write_rsp *rsp = NULL;
4449         int resp_buftype;
4450         struct kvec rsp_iov;
4451         int flags = 0;
4452         unsigned int total_len;
4453         struct TCP_Server_Info *server;
4454
4455         *nbytes = 0;
4456
4457         if (n_vec < 1)
4458                 return rc;
4459
4460         if (!io_parms->server)
4461                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4462         server = io_parms->server;
4463         if (server == NULL)
4464                 return -ECONNABORTED;
4465
4466         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4467                                  (void **) &req, &total_len);
4468         if (rc)
4469                 return rc;
4470
4471         if (smb3_encryption_required(io_parms->tcon))
4472                 flags |= CIFS_TRANSFORM_REQ;
4473
4474         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4475
4476         req->PersistentFileId = io_parms->persistent_fid;
4477         req->VolatileFileId = io_parms->volatile_fid;
4478         req->WriteChannelInfoOffset = 0;
4479         req->WriteChannelInfoLength = 0;
4480         req->Channel = 0;
4481         req->Length = cpu_to_le32(io_parms->length);
4482         req->Offset = cpu_to_le64(io_parms->offset);
4483         req->DataOffset = cpu_to_le16(
4484                                 offsetof(struct smb2_write_req, Buffer));
4485         req->RemainingBytes = 0;
4486
4487         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4488                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4489                 io_parms->offset, io_parms->length);
4490
4491         iov[0].iov_base = (char *)req;
4492         /* 1 for Buffer */
4493         iov[0].iov_len = total_len - 1;
4494
4495         memset(&rqst, 0, sizeof(struct smb_rqst));
4496         rqst.rq_iov = iov;
4497         rqst.rq_nvec = n_vec + 1;
4498
4499         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4500                             &rqst,
4501                             &resp_buftype, flags, &rsp_iov);
4502         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4503
4504         if (rc) {
4505                 trace_smb3_write_err(xid, req->PersistentFileId,
4506                                      io_parms->tcon->tid,
4507                                      io_parms->tcon->ses->Suid,
4508                                      io_parms->offset, io_parms->length, rc);
4509                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4510                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4511         } else {
4512                 *nbytes = le32_to_cpu(rsp->DataLength);
4513                 trace_smb3_write_done(xid, req->PersistentFileId,
4514                                      io_parms->tcon->tid,
4515                                      io_parms->tcon->ses->Suid,
4516                                      io_parms->offset, *nbytes);
4517         }
4518
4519         cifs_small_buf_release(req);
4520         free_rsp_buf(resp_buftype, rsp);
4521         return rc;
4522 }
4523
4524 int posix_info_sid_size(const void *beg, const void *end)
4525 {
4526         size_t subauth;
4527         int total;
4528
4529         if (beg + 1 > end)
4530                 return -1;
4531
4532         subauth = *(u8 *)(beg+1);
4533         if (subauth < 1 || subauth > 15)
4534                 return -1;
4535
4536         total = 1 + 1 + 6 + 4*subauth;
4537         if (beg + total > end)
4538                 return -1;
4539
4540         return total;
4541 }
4542
4543 int posix_info_parse(const void *beg, const void *end,
4544                      struct smb2_posix_info_parsed *out)
4545
4546 {
4547         int total_len = 0;
4548         int sid_len;
4549         int name_len;
4550         const void *owner_sid;
4551         const void *group_sid;
4552         const void *name;
4553
4554         /* if no end bound given, assume payload to be correct */
4555         if (!end) {
4556                 const struct smb2_posix_info *p = beg;
4557
4558                 end = beg + le32_to_cpu(p->NextEntryOffset);
4559                 /* last element will have a 0 offset, pick a sensible bound */
4560                 if (end == beg)
4561                         end += 0xFFFF;
4562         }
4563
4564         /* check base buf */
4565         if (beg + sizeof(struct smb2_posix_info) > end)
4566                 return -1;
4567         total_len = sizeof(struct smb2_posix_info);
4568
4569         /* check owner sid */
4570         owner_sid = beg + total_len;
4571         sid_len = posix_info_sid_size(owner_sid, end);
4572         if (sid_len < 0)
4573                 return -1;
4574         total_len += sid_len;
4575
4576         /* check group sid */
4577         group_sid = beg + total_len;
4578         sid_len = posix_info_sid_size(group_sid, end);
4579         if (sid_len < 0)
4580                 return -1;
4581         total_len += sid_len;
4582
4583         /* check name len */
4584         if (beg + total_len + 4 > end)
4585                 return -1;
4586         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4587         if (name_len < 1 || name_len > 0xFFFF)
4588                 return -1;
4589         total_len += 4;
4590
4591         /* check name */
4592         name = beg + total_len;
4593         if (name + name_len > end)
4594                 return -1;
4595         total_len += name_len;
4596
4597         if (out) {
4598                 out->base = beg;
4599                 out->size = total_len;
4600                 out->name_len = name_len;
4601                 out->name = name;
4602                 memcpy(&out->owner, owner_sid,
4603                        posix_info_sid_size(owner_sid, end));
4604                 memcpy(&out->group, group_sid,
4605                        posix_info_sid_size(group_sid, end));
4606         }
4607         return total_len;
4608 }
4609
4610 static int posix_info_extra_size(const void *beg, const void *end)
4611 {
4612         int len = posix_info_parse(beg, end, NULL);
4613
4614         if (len < 0)
4615                 return -1;
4616         return len - sizeof(struct smb2_posix_info);
4617 }
4618
4619 static unsigned int
4620 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4621             size_t size)
4622 {
4623         int len;
4624         unsigned int entrycount = 0;
4625         unsigned int next_offset = 0;
4626         char *entryptr;
4627         FILE_DIRECTORY_INFO *dir_info;
4628
4629         if (bufstart == NULL)
4630                 return 0;
4631
4632         entryptr = bufstart;
4633
4634         while (1) {
4635                 if (entryptr + next_offset < entryptr ||
4636                     entryptr + next_offset > end_of_buf ||
4637                     entryptr + next_offset + size > end_of_buf) {
4638                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4639                         break;
4640                 }
4641
4642                 entryptr = entryptr + next_offset;
4643                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4644
4645                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4646                         len = posix_info_extra_size(entryptr, end_of_buf);
4647                 else
4648                         len = le32_to_cpu(dir_info->FileNameLength);
4649
4650                 if (len < 0 ||
4651                     entryptr + len < entryptr ||
4652                     entryptr + len > end_of_buf ||
4653                     entryptr + len + size > end_of_buf) {
4654                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4655                                  end_of_buf);
4656                         break;
4657                 }
4658
4659                 *lastentry = entryptr;
4660                 entrycount++;
4661
4662                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4663                 if (!next_offset)
4664                         break;
4665         }
4666
4667         return entrycount;
4668 }
4669
4670 /*
4671  * Readdir/FindFirst
4672  */
4673 int SMB2_query_directory_init(const unsigned int xid,
4674                               struct cifs_tcon *tcon,
4675                               struct TCP_Server_Info *server,
4676                               struct smb_rqst *rqst,
4677                               u64 persistent_fid, u64 volatile_fid,
4678                               int index, int info_level)
4679 {
4680         struct smb2_query_directory_req *req;
4681         unsigned char *bufptr;
4682         __le16 asteriks = cpu_to_le16('*');
4683         unsigned int output_size = CIFSMaxBufSize -
4684                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4685                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4686         unsigned int total_len;
4687         struct kvec *iov = rqst->rq_iov;
4688         int len, rc;
4689
4690         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4691                                  (void **) &req, &total_len);
4692         if (rc)
4693                 return rc;
4694
4695         switch (info_level) {
4696         case SMB_FIND_FILE_DIRECTORY_INFO:
4697                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4698                 break;
4699         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4700                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4701                 break;
4702         case SMB_FIND_FILE_POSIX_INFO:
4703                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4704                 break;
4705         default:
4706                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4707                         info_level);
4708                 return -EINVAL;
4709         }
4710
4711         req->FileIndex = cpu_to_le32(index);
4712         req->PersistentFileId = persistent_fid;
4713         req->VolatileFileId = volatile_fid;
4714
4715         len = 0x2;
4716         bufptr = req->Buffer;
4717         memcpy(bufptr, &asteriks, len);
4718
4719         req->FileNameOffset =
4720                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4721         req->FileNameLength = cpu_to_le16(len);
4722         /*
4723          * BB could be 30 bytes or so longer if we used SMB2 specific
4724          * buffer lengths, but this is safe and close enough.
4725          */
4726         output_size = min_t(unsigned int, output_size, server->maxBuf);
4727         output_size = min_t(unsigned int, output_size, 2 << 15);
4728         req->OutputBufferLength = cpu_to_le32(output_size);
4729
4730         iov[0].iov_base = (char *)req;
4731         /* 1 for Buffer */
4732         iov[0].iov_len = total_len - 1;
4733
4734         iov[1].iov_base = (char *)(req->Buffer);
4735         iov[1].iov_len = len;
4736
4737         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4738                         tcon->ses->Suid, index, output_size);
4739
4740         return 0;
4741 }
4742
4743 void SMB2_query_directory_free(struct smb_rqst *rqst)
4744 {
4745         if (rqst && rqst->rq_iov) {
4746                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4747         }
4748 }
4749
4750 int
4751 smb2_parse_query_directory(struct cifs_tcon *tcon,
4752                            struct kvec *rsp_iov,
4753                            int resp_buftype,
4754                            struct cifs_search_info *srch_inf)
4755 {
4756         struct smb2_query_directory_rsp *rsp;
4757         size_t info_buf_size;
4758         char *end_of_smb;
4759         int rc;
4760
4761         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4762
4763         switch (srch_inf->info_level) {
4764         case SMB_FIND_FILE_DIRECTORY_INFO:
4765                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4766                 break;
4767         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4768                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4769                 break;
4770         case SMB_FIND_FILE_POSIX_INFO:
4771                 /* note that posix payload are variable size */
4772                 info_buf_size = sizeof(struct smb2_posix_info);
4773                 break;
4774         default:
4775                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4776                          srch_inf->info_level);
4777                 return -EINVAL;
4778         }
4779
4780         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4781                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4782                                info_buf_size);
4783         if (rc) {
4784                 cifs_tcon_dbg(VFS, "bad info payload");
4785                 return rc;
4786         }
4787
4788         srch_inf->unicode = true;
4789
4790         if (srch_inf->ntwrk_buf_start) {
4791                 if (srch_inf->smallBuf)
4792                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4793                 else
4794                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4795         }
4796         srch_inf->ntwrk_buf_start = (char *)rsp;
4797         srch_inf->srch_entries_start = srch_inf->last_entry =
4798                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4799         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4800
4801         srch_inf->entries_in_buffer = num_entries(
4802                 srch_inf->info_level,
4803                 srch_inf->srch_entries_start,
4804                 end_of_smb,
4805                 &srch_inf->last_entry,
4806                 info_buf_size);
4807
4808         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4809         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4810                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4811                  srch_inf->srch_entries_start, srch_inf->last_entry);
4812         if (resp_buftype == CIFS_LARGE_BUFFER)
4813                 srch_inf->smallBuf = false;
4814         else if (resp_buftype == CIFS_SMALL_BUFFER)
4815                 srch_inf->smallBuf = true;
4816         else
4817                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4818
4819         return 0;
4820 }
4821
4822 int
4823 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4824                      u64 persistent_fid, u64 volatile_fid, int index,
4825                      struct cifs_search_info *srch_inf)
4826 {
4827         struct smb_rqst rqst;
4828         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4829         struct smb2_query_directory_rsp *rsp = NULL;
4830         int resp_buftype = CIFS_NO_BUFFER;
4831         struct kvec rsp_iov;
4832         int rc = 0;
4833         struct cifs_ses *ses = tcon->ses;
4834         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4835         int flags = 0;
4836
4837         if (!ses || !(ses->server))
4838                 return -EIO;
4839
4840         if (smb3_encryption_required(tcon))
4841                 flags |= CIFS_TRANSFORM_REQ;
4842
4843         memset(&rqst, 0, sizeof(struct smb_rqst));
4844         memset(&iov, 0, sizeof(iov));
4845         rqst.rq_iov = iov;
4846         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4847
4848         rc = SMB2_query_directory_init(xid, tcon, server,
4849                                        &rqst, persistent_fid,
4850                                        volatile_fid, index,
4851                                        srch_inf->info_level);
4852         if (rc)
4853                 goto qdir_exit;
4854
4855         rc = cifs_send_recv(xid, ses, server,
4856                             &rqst, &resp_buftype, flags, &rsp_iov);
4857         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4858
4859         if (rc) {
4860                 if (rc == -ENODATA &&
4861                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4862                         trace_smb3_query_dir_done(xid, persistent_fid,
4863                                 tcon->tid, tcon->ses->Suid, index, 0);
4864                         srch_inf->endOfSearch = true;
4865                         rc = 0;
4866                 } else {
4867                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4868                                 tcon->ses->Suid, index, 0, rc);
4869                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4870                 }
4871                 goto qdir_exit;
4872         }
4873
4874         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4875                                         srch_inf);
4876         if (rc) {
4877                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4878                         tcon->ses->Suid, index, 0, rc);
4879                 goto qdir_exit;
4880         }
4881         resp_buftype = CIFS_NO_BUFFER;
4882
4883         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4884                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4885
4886 qdir_exit:
4887         SMB2_query_directory_free(&rqst);
4888         free_rsp_buf(resp_buftype, rsp);
4889         return rc;
4890 }
4891
4892 int
4893 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4894                    struct smb_rqst *rqst,
4895                    u64 persistent_fid, u64 volatile_fid, u32 pid,
4896                    u8 info_class, u8 info_type, u32 additional_info,
4897                    void **data, unsigned int *size)
4898 {
4899         struct smb2_set_info_req *req;
4900         struct kvec *iov = rqst->rq_iov;
4901         unsigned int i, total_len;
4902         int rc;
4903
4904         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4905                                  (void **) &req, &total_len);
4906         if (rc)
4907                 return rc;
4908
4909         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4910         req->InfoType = info_type;
4911         req->FileInfoClass = info_class;
4912         req->PersistentFileId = persistent_fid;
4913         req->VolatileFileId = volatile_fid;
4914         req->AdditionalInformation = cpu_to_le32(additional_info);
4915
4916         req->BufferOffset =
4917                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4918         req->BufferLength = cpu_to_le32(*size);
4919
4920         memcpy(req->Buffer, *data, *size);
4921         total_len += *size;
4922
4923         iov[0].iov_base = (char *)req;
4924         /* 1 for Buffer */
4925         iov[0].iov_len = total_len - 1;
4926
4927         for (i = 1; i < rqst->rq_nvec; i++) {
4928                 le32_add_cpu(&req->BufferLength, size[i]);
4929                 iov[i].iov_base = (char *)data[i];
4930                 iov[i].iov_len = size[i];
4931         }
4932
4933         return 0;
4934 }
4935
4936 void
4937 SMB2_set_info_free(struct smb_rqst *rqst)
4938 {
4939         if (rqst && rqst->rq_iov)
4940                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4941 }
4942
4943 static int
4944 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4945                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4946                u8 info_type, u32 additional_info, unsigned int num,
4947                 void **data, unsigned int *size)
4948 {
4949         struct smb_rqst rqst;
4950         struct smb2_set_info_rsp *rsp = NULL;
4951         struct kvec *iov;
4952         struct kvec rsp_iov;
4953         int rc = 0;
4954         int resp_buftype;
4955         struct cifs_ses *ses = tcon->ses;
4956         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4957         int flags = 0;
4958
4959         if (!ses || !server)
4960                 return -EIO;
4961
4962         if (!num)
4963                 return -EINVAL;
4964
4965         if (smb3_encryption_required(tcon))
4966                 flags |= CIFS_TRANSFORM_REQ;
4967
4968         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4969         if (!iov)
4970                 return -ENOMEM;
4971
4972         memset(&rqst, 0, sizeof(struct smb_rqst));
4973         rqst.rq_iov = iov;
4974         rqst.rq_nvec = num;
4975
4976         rc = SMB2_set_info_init(tcon, server,
4977                                 &rqst, persistent_fid, volatile_fid, pid,
4978                                 info_class, info_type, additional_info,
4979                                 data, size);
4980         if (rc) {
4981                 kfree(iov);
4982                 return rc;
4983         }
4984
4985
4986         rc = cifs_send_recv(xid, ses, server,
4987                             &rqst, &resp_buftype, flags,
4988                             &rsp_iov);
4989         SMB2_set_info_free(&rqst);
4990         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4991
4992         if (rc != 0) {
4993                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4994                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4995                                 ses->Suid, info_class, (__u32)info_type, rc);
4996         }
4997
4998         free_rsp_buf(resp_buftype, rsp);
4999         kfree(iov);
5000         return rc;
5001 }
5002
5003 int
5004 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5005              u64 volatile_fid, u32 pid, __le64 *eof)
5006 {
5007         struct smb2_file_eof_info info;
5008         void *data;
5009         unsigned int size;
5010
5011         info.EndOfFile = *eof;
5012
5013         data = &info;
5014         size = sizeof(struct smb2_file_eof_info);
5015
5016         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5017                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5018                         0, 1, &data, &size);
5019 }
5020
5021 int
5022 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5023                 u64 persistent_fid, u64 volatile_fid,
5024                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5025 {
5026         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5027                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5028                         1, (void **)&pnntsd, &pacllen);
5029 }
5030
5031 int
5032 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5033             u64 persistent_fid, u64 volatile_fid,
5034             struct smb2_file_full_ea_info *buf, int len)
5035 {
5036         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5037                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5038                 0, 1, (void **)&buf, &len);
5039 }
5040
5041 int
5042 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5043                   const u64 persistent_fid, const u64 volatile_fid,
5044                   __u8 oplock_level)
5045 {
5046         struct smb_rqst rqst;
5047         int rc;
5048         struct smb2_oplock_break *req = NULL;
5049         struct cifs_ses *ses = tcon->ses;
5050         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5051         int flags = CIFS_OBREAK_OP;
5052         unsigned int total_len;
5053         struct kvec iov[1];
5054         struct kvec rsp_iov;
5055         int resp_buf_type;
5056
5057         cifs_dbg(FYI, "SMB2_oplock_break\n");
5058         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5059                                  (void **) &req, &total_len);
5060         if (rc)
5061                 return rc;
5062
5063         if (smb3_encryption_required(tcon))
5064                 flags |= CIFS_TRANSFORM_REQ;
5065
5066         req->VolatileFid = volatile_fid;
5067         req->PersistentFid = persistent_fid;
5068         req->OplockLevel = oplock_level;
5069         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5070
5071         flags |= CIFS_NO_RSP_BUF;
5072
5073         iov[0].iov_base = (char *)req;
5074         iov[0].iov_len = total_len;
5075
5076         memset(&rqst, 0, sizeof(struct smb_rqst));
5077         rqst.rq_iov = iov;
5078         rqst.rq_nvec = 1;
5079
5080         rc = cifs_send_recv(xid, ses, server,
5081                             &rqst, &resp_buf_type, flags, &rsp_iov);
5082         cifs_small_buf_release(req);
5083
5084         if (rc) {
5085                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5086                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5087         }
5088
5089         return rc;
5090 }
5091
5092 void
5093 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5094                              struct kstatfs *kst)
5095 {
5096         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5097                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5098         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5099         kst->f_bfree  = kst->f_bavail =
5100                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5101         return;
5102 }
5103
5104 static void
5105 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5106                         struct kstatfs *kst)
5107 {
5108         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5109         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5110         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5111         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5112                 kst->f_bavail = kst->f_bfree;
5113         else
5114                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5115         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5116                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5117         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5118                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5119
5120         return;
5121 }
5122
5123 static int
5124 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5125                    struct TCP_Server_Info *server,
5126                    int level, int outbuf_len, u64 persistent_fid,
5127                    u64 volatile_fid)
5128 {
5129         int rc;
5130         struct smb2_query_info_req *req;
5131         unsigned int total_len;
5132
5133         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5134
5135         if ((tcon->ses == NULL) || server == NULL)
5136                 return -EIO;
5137
5138         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5139                                  (void **) &req, &total_len);
5140         if (rc)
5141                 return rc;
5142
5143         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5144         req->FileInfoClass = level;
5145         req->PersistentFileId = persistent_fid;
5146         req->VolatileFileId = volatile_fid;
5147         /* 1 for pad */
5148         req->InputBufferOffset =
5149                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5150         req->OutputBufferLength = cpu_to_le32(
5151                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5152
5153         iov->iov_base = (char *)req;
5154         iov->iov_len = total_len;
5155         return 0;
5156 }
5157
5158 int
5159 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5160               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5161 {
5162         struct smb_rqst rqst;
5163         struct smb2_query_info_rsp *rsp = NULL;
5164         struct kvec iov;
5165         struct kvec rsp_iov;
5166         int rc = 0;
5167         int resp_buftype;
5168         struct cifs_ses *ses = tcon->ses;
5169         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5170         FILE_SYSTEM_POSIX_INFO *info = NULL;
5171         int flags = 0;
5172
5173         rc = build_qfs_info_req(&iov, tcon, server,
5174                                 FS_POSIX_INFORMATION,
5175                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5176                                 persistent_fid, volatile_fid);
5177         if (rc)
5178                 return rc;
5179
5180         if (smb3_encryption_required(tcon))
5181                 flags |= CIFS_TRANSFORM_REQ;
5182
5183         memset(&rqst, 0, sizeof(struct smb_rqst));
5184         rqst.rq_iov = &iov;
5185         rqst.rq_nvec = 1;
5186
5187         rc = cifs_send_recv(xid, ses, server,
5188                             &rqst, &resp_buftype, flags, &rsp_iov);
5189         cifs_small_buf_release(iov.iov_base);
5190         if (rc) {
5191                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5192                 goto posix_qfsinf_exit;
5193         }
5194         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5195
5196         info = (FILE_SYSTEM_POSIX_INFO *)(
5197                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5198         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5199                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5200                                sizeof(FILE_SYSTEM_POSIX_INFO));
5201         if (!rc)
5202                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5203
5204 posix_qfsinf_exit:
5205         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5206         return rc;
5207 }
5208
5209 int
5210 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5211               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5212 {
5213         struct smb_rqst rqst;
5214         struct smb2_query_info_rsp *rsp = NULL;
5215         struct kvec iov;
5216         struct kvec rsp_iov;
5217         int rc = 0;
5218         int resp_buftype;
5219         struct cifs_ses *ses = tcon->ses;
5220         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5221         struct smb2_fs_full_size_info *info = NULL;
5222         int flags = 0;
5223
5224         rc = build_qfs_info_req(&iov, tcon, server,
5225                                 FS_FULL_SIZE_INFORMATION,
5226                                 sizeof(struct smb2_fs_full_size_info),
5227                                 persistent_fid, volatile_fid);
5228         if (rc)
5229                 return rc;
5230
5231         if (smb3_encryption_required(tcon))
5232                 flags |= CIFS_TRANSFORM_REQ;
5233
5234         memset(&rqst, 0, sizeof(struct smb_rqst));
5235         rqst.rq_iov = &iov;
5236         rqst.rq_nvec = 1;
5237
5238         rc = cifs_send_recv(xid, ses, server,
5239                             &rqst, &resp_buftype, flags, &rsp_iov);
5240         cifs_small_buf_release(iov.iov_base);
5241         if (rc) {
5242                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5243                 goto qfsinf_exit;
5244         }
5245         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5246
5247         info = (struct smb2_fs_full_size_info *)(
5248                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5249         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5250                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5251                                sizeof(struct smb2_fs_full_size_info));
5252         if (!rc)
5253                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5254
5255 qfsinf_exit:
5256         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5257         return rc;
5258 }
5259
5260 int
5261 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5262               u64 persistent_fid, u64 volatile_fid, int level)
5263 {
5264         struct smb_rqst rqst;
5265         struct smb2_query_info_rsp *rsp = NULL;
5266         struct kvec iov;
5267         struct kvec rsp_iov;
5268         int rc = 0;
5269         int resp_buftype, max_len, min_len;
5270         struct cifs_ses *ses = tcon->ses;
5271         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5272         unsigned int rsp_len, offset;
5273         int flags = 0;
5274
5275         if (level == FS_DEVICE_INFORMATION) {
5276                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5277                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5278         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5279                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5280                 min_len = MIN_FS_ATTR_INFO_SIZE;
5281         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5282                 max_len = sizeof(struct smb3_fs_ss_info);
5283                 min_len = sizeof(struct smb3_fs_ss_info);
5284         } else if (level == FS_VOLUME_INFORMATION) {
5285                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5286                 min_len = sizeof(struct smb3_fs_vol_info);
5287         } else {
5288                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5289                 return -EINVAL;
5290         }
5291
5292         rc = build_qfs_info_req(&iov, tcon, server,
5293                                 level, max_len,
5294                                 persistent_fid, volatile_fid);
5295         if (rc)
5296                 return rc;
5297
5298         if (smb3_encryption_required(tcon))
5299                 flags |= CIFS_TRANSFORM_REQ;
5300
5301         memset(&rqst, 0, sizeof(struct smb_rqst));
5302         rqst.rq_iov = &iov;
5303         rqst.rq_nvec = 1;
5304
5305         rc = cifs_send_recv(xid, ses, server,
5306                             &rqst, &resp_buftype, flags, &rsp_iov);
5307         cifs_small_buf_release(iov.iov_base);
5308         if (rc) {
5309                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5310                 goto qfsattr_exit;
5311         }
5312         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5313
5314         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5315         offset = le16_to_cpu(rsp->OutputBufferOffset);
5316         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5317         if (rc)
5318                 goto qfsattr_exit;
5319
5320         if (level == FS_ATTRIBUTE_INFORMATION)
5321                 memcpy(&tcon->fsAttrInfo, offset
5322                         + (char *)rsp, min_t(unsigned int,
5323                         rsp_len, max_len));
5324         else if (level == FS_DEVICE_INFORMATION)
5325                 memcpy(&tcon->fsDevInfo, offset
5326                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5327         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5328                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5329                         (offset + (char *)rsp);
5330                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5331                 tcon->perf_sector_size =
5332                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5333         } else if (level == FS_VOLUME_INFORMATION) {
5334                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5335                         (offset + (char *)rsp);
5336                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5337                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5338         }
5339
5340 qfsattr_exit:
5341         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5342         return rc;
5343 }
5344
5345 int
5346 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5347            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5348            const __u32 num_lock, struct smb2_lock_element *buf)
5349 {
5350         struct smb_rqst rqst;
5351         int rc = 0;
5352         struct smb2_lock_req *req = NULL;
5353         struct kvec iov[2];
5354         struct kvec rsp_iov;
5355         int resp_buf_type;
5356         unsigned int count;
5357         int flags = CIFS_NO_RSP_BUF;
5358         unsigned int total_len;
5359         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5360
5361         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5362
5363         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5364                                  (void **) &req, &total_len);
5365         if (rc)
5366                 return rc;
5367
5368         if (smb3_encryption_required(tcon))
5369                 flags |= CIFS_TRANSFORM_REQ;
5370
5371         req->sync_hdr.ProcessId = cpu_to_le32(pid);
5372         req->LockCount = cpu_to_le16(num_lock);
5373
5374         req->PersistentFileId = persist_fid;
5375         req->VolatileFileId = volatile_fid;
5376
5377         count = num_lock * sizeof(struct smb2_lock_element);
5378
5379         iov[0].iov_base = (char *)req;
5380         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5381         iov[1].iov_base = (char *)buf;
5382         iov[1].iov_len = count;
5383
5384         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5385
5386         memset(&rqst, 0, sizeof(struct smb_rqst));
5387         rqst.rq_iov = iov;
5388         rqst.rq_nvec = 2;
5389
5390         rc = cifs_send_recv(xid, tcon->ses, server,
5391                             &rqst, &resp_buf_type, flags,
5392                             &rsp_iov);
5393         cifs_small_buf_release(req);
5394         if (rc) {
5395                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5396                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5397                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5398                                     tcon->ses->Suid, rc);
5399         }
5400
5401         return rc;
5402 }
5403
5404 int
5405 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5406           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5407           const __u64 length, const __u64 offset, const __u32 lock_flags,
5408           const bool wait)
5409 {
5410         struct smb2_lock_element lock;
5411
5412         lock.Offset = cpu_to_le64(offset);
5413         lock.Length = cpu_to_le64(length);
5414         lock.Flags = cpu_to_le32(lock_flags);
5415         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5416                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5417
5418         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5419 }
5420
5421 int
5422 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5423                  __u8 *lease_key, const __le32 lease_state)
5424 {
5425         struct smb_rqst rqst;
5426         int rc;
5427         struct smb2_lease_ack *req = NULL;
5428         struct cifs_ses *ses = tcon->ses;
5429         int flags = CIFS_OBREAK_OP;
5430         unsigned int total_len;
5431         struct kvec iov[1];
5432         struct kvec rsp_iov;
5433         int resp_buf_type;
5434         __u64 *please_key_high;
5435         __u64 *please_key_low;
5436         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5437
5438         cifs_dbg(FYI, "SMB2_lease_break\n");
5439         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5440                                  (void **) &req, &total_len);
5441         if (rc)
5442                 return rc;
5443
5444         if (smb3_encryption_required(tcon))
5445                 flags |= CIFS_TRANSFORM_REQ;
5446
5447         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5448         req->StructureSize = cpu_to_le16(36);
5449         total_len += 12;
5450
5451         memcpy(req->LeaseKey, lease_key, 16);
5452         req->LeaseState = lease_state;
5453
5454         flags |= CIFS_NO_RSP_BUF;
5455
5456         iov[0].iov_base = (char *)req;
5457         iov[0].iov_len = total_len;
5458
5459         memset(&rqst, 0, sizeof(struct smb_rqst));
5460         rqst.rq_iov = iov;
5461         rqst.rq_nvec = 1;
5462
5463         rc = cifs_send_recv(xid, ses, server,
5464                             &rqst, &resp_buf_type, flags, &rsp_iov);
5465         cifs_small_buf_release(req);
5466
5467         please_key_low = (__u64 *)lease_key;
5468         please_key_high = (__u64 *)(lease_key+8);
5469         if (rc) {
5470                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5471                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5472                         ses->Suid, *please_key_low, *please_key_high, rc);
5473                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5474         } else
5475                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5476                         ses->Suid, *please_key_low, *please_key_high);
5477
5478         return rc;
5479 }