fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon || !tcon->ses)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon,
 102                   struct TCP_Server_Info *server)
 103 {
 104         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 105         shdr->StructureSize = cpu_to_le16(64);
 106         shdr->Command = smb2_cmd;
 107         if (server) {
 108                 spin_lock(&server->req_lock);
 109                 /* Request up to 10 credits but don't go over the limit. */
 110                 if (server->credits >= server->max_credits)
 111                         shdr->CreditRequest = cpu_to_le16(0);
 112                 else
 113                         shdr->CreditRequest = cpu_to_le16(
 114                                 min_t(int, server->max_credits -
 115                                                 server->credits, 10));
 116                 spin_unlock(&server->req_lock);
 117         } else {
 118                 shdr->CreditRequest = cpu_to_le16(2);
 119         }
 120         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 121
 122         if (!tcon)
 123                 goto out;
 124
 125         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 126         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 127         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 128                 shdr->CreditCharge = cpu_to_le16(1);
 129         /* else CreditCharge MBZ */
 130
 131         shdr->TreeId = tcon->tid;
 132         /* Uid is not converted */
 133         if (tcon->ses)
 134                 shdr->SessionId = tcon->ses->Suid;
 135
 136         /*
 137          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 138          * to pass the path on the Open SMB prefixed by \\server\share.
 139          * Not sure when we would need to do the augmented path (if ever) and
 140          * setting this flag breaks the SMB2 open operation since it is
 141          * illegal to send an empty path name (without \\server\share prefix)
 142          * when the DFS flag is set in the SMB open header. We could
 143          * consider setting the flag on all operations other than open
 144          * but it is safer to net set it for now.
 145          */
 146 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 147                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 148
 149         if (server && server->sign && !smb3_encryption_required(tcon))
 150                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 151 out:
 152         return;
 153 }
 154
 155 static int
 156 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 157                struct TCP_Server_Info *server)
 158 {
 159         int rc;
 160         struct nls_table *nls_codepage;
 161         struct cifs_ses *ses;
 162         int retries;
 163
 164         /*
 165          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 166          * check for tcp and smb session status done differently
 167          * for those three - in the calling routine.
 168          */
 169         if (tcon == NULL)
 170                 return 0;
 171
 172         if (smb2_command == SMB2_TREE_CONNECT)
 173                 return 0;
 174
 175         if (tcon->tidStatus == CifsExiting) {
 176                 /*
 177                  * only tree disconnect, open, and write,
 178                  * (and ulogoff which does not have tcon)
 179                  * are allowed as we start force umount.
 180                  */
 181                 if ((smb2_command != SMB2_WRITE) &&
 182                    (smb2_command != SMB2_CREATE) &&
 183                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 184                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 185                                  smb2_command);
 186                         return -ENODEV;
 187                 }
 188         }
 189         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 190             (!tcon->ses->server) || !server)
 191                 return -EIO;
 192
 193         ses = tcon->ses;
 194         retries = server->nr_targets;
 195
 196         /*
 197          * Give demultiplex thread up to 10 seconds to each target available for
 198          * reconnect -- should be greater than cifs socket timeout which is 7
 199          * seconds.
 200          */
 201         while (server->tcpStatus == CifsNeedReconnect) {
 202                 /*
 203                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 204                  * here since they are implicitly done when session drops.
 205                  */
 206                 switch (smb2_command) {
 207                 /*
 208                  * BB Should we keep oplock break and add flush to exceptions?
 209                  */
 210                 case SMB2_TREE_DISCONNECT:
 211                 case SMB2_CANCEL:
 212                 case SMB2_CLOSE:
 213                 case SMB2_OPLOCK_BREAK:
 214                         return -EAGAIN;
 215                 }
 216
 217                 rc = wait_event_interruptible_timeout(server->response_q,
 218                                                       (server->tcpStatus != CifsNeedReconnect),
 219                                                       10 * HZ);
 220                 if (rc < 0) {
 221                         cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
 222                                  __func__);
 223                         return -ERESTARTSYS;
 224                 }
 225
 226                 /* are we still trying to reconnect? */
 227                 if (server->tcpStatus != CifsNeedReconnect)
 228                         break;
 229
 230                 if (retries && --retries)
 231                         continue;
 232
 233                 /*
 234                  * on "soft" mounts we wait once. Hard mounts keep
 235                  * retrying until process is killed or server comes
 236                  * back on-line
 237                  */
 238                 if (!tcon->retry) {
 239                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 240                         return -EHOSTDOWN;
 241                 }
 242                 retries = server->nr_targets;
 243         }
 244
 245         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 246                 return 0;
 247
 248         nls_codepage = load_nls_default();
 249
 250         /*
 251          * need to prevent multiple threads trying to simultaneously reconnect
 252          * the same SMB session
 253          */
 254         mutex_lock(&tcon->ses->session_mutex);
 255
 256         /*
 257          * Recheck after acquire mutex. If another thread is negotiating
 258          * and the server never sends an answer the socket will be closed
 259          * and tcpStatus set to reconnect.
 260          */
 261         if (server->tcpStatus == CifsNeedReconnect) {
 262                 rc = -EHOSTDOWN;
 263                 mutex_unlock(&tcon->ses->session_mutex);
 264                 goto out;
 265         }
 266
 267         /*
 268          * If we are reconnecting an extra channel, bind
 269          */
 270         if (server->is_channel) {
 271                 ses->binding = true;
 272                 ses->binding_chan = cifs_ses_find_chan(ses, server);
 273         }
 274
 275         rc = cifs_negotiate_protocol(0, tcon->ses);
 276         if (!rc && tcon->ses->need_reconnect) {
 277                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 278                 if ((rc == -EACCES) && !tcon->retry) {
 279                         rc = -EHOSTDOWN;
 280                         ses->binding = false;
 281                         ses->binding_chan = NULL;
 282                         mutex_unlock(&tcon->ses->session_mutex);
 283                         goto failed;
 284                 } else if (rc) {
 285                         mutex_unlock(&ses->session_mutex);
 286                         goto out;
 287                 }
 288         }
 289         /*
 290          * End of channel binding
 291          */
 292         ses->binding = false;
 293         ses->binding_chan = NULL;
 294
 295         if (rc || !tcon->need_reconnect) {
 296                 mutex_unlock(&tcon->ses->session_mutex);
 297                 goto out;
 298         }
 299
 300         cifs_mark_open_files_invalid(tcon);
 301         if (tcon->use_persistent)
 302                 tcon->need_reopen_files = true;
 303
 304         rc = cifs_tree_connect(0, tcon, nls_codepage);
 305         mutex_unlock(&tcon->ses->session_mutex);
 306
 307         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 308         if (rc) {
 309                 /* If sess reconnected but tcon didn't, something strange ... */
 310                 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
 311                 goto out;
 312         }
 313
 314         if (smb2_command != SMB2_INTERNAL_CMD)
 315                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 316
 317         atomic_inc(&tconInfoReconnectCount);
 318 out:
 319         /*
 320          * Check if handle based operation so we know whether we can continue
 321          * or not without returning to caller to reset file handle.
 322          */
 323         /*
 324          * BB Is flush done by server on drop of tcp session? Should we special
 325          * case it and skip above?
 326          */
 327         switch (smb2_command) {
 328         case SMB2_FLUSH:
 329         case SMB2_READ:
 330         case SMB2_WRITE:
 331         case SMB2_LOCK:
 332         case SMB2_IOCTL:
 333         case SMB2_QUERY_DIRECTORY:
 334         case SMB2_CHANGE_NOTIFY:
 335         case SMB2_QUERY_INFO:
 336         case SMB2_SET_INFO:
 337                 rc = -EAGAIN;
 338         }
 339 failed:
 340         unload_nls(nls_codepage);
 341         return rc;
 342 }
 343
 344 static void
 345 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 346                struct TCP_Server_Info *server,
 347                void *buf,
 348                unsigned int *total_len)
 349 {
 350         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 351         /* lookup word count ie StructureSize from table */
 352         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 353
 354         /*
 355          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 356          * largest operations (Create)
 357          */
 358         memset(buf, 0, 256);
 359
 360         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
 361         spdu->StructureSize2 = cpu_to_le16(parmsize);
 362
 363         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 364 }
 365
 366 /*
 367  * Allocate and return pointer to an SMB request hdr, and set basic
 368  * SMB information in the SMB header. If the return code is zero, this
 369  * function must have filled in request_buf pointer.
 370  */
 371 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 372                                  struct TCP_Server_Info *server,
 373                                  void **request_buf, unsigned int *total_len)
 374 {
 375         /* BB eventually switch this to SMB2 specific small buf size */
 376         if (smb2_command == SMB2_SET_INFO)
 377                 *request_buf = cifs_buf_get();
 378         else
 379                 *request_buf = cifs_small_buf_get();
 380         if (*request_buf == NULL) {
 381                 /* BB should we add a retry in here if not a writepage? */
 382                 return -ENOMEM;
 383         }
 384
 385         fill_small_buf(smb2_command, tcon, server,
 386                        (struct smb2_sync_hdr *)(*request_buf),
 387                        total_len);
 388
 389         if (tcon != NULL) {
 390                 uint16_t com_code = le16_to_cpu(smb2_command);
 391                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 392                 cifs_stats_inc(&tcon->num_smbs_sent);
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 399                                struct TCP_Server_Info *server,
 400                                void **request_buf, unsigned int *total_len)
 401 {
 402         int rc;
 403
 404         rc = smb2_reconnect(smb2_command, tcon, server);
 405         if (rc)
 406                 return rc;
 407
 408         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 409                                      total_len);
 410 }
 411
 412 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 413                                struct TCP_Server_Info *server,
 414                                void **request_buf, unsigned int *total_len)
 415 {
 416         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 417         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 418                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 419                                              request_buf, total_len);
 420         }
 421         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 422                                    request_buf, total_len);
 423 }
 424
 425 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 426
 427 static void
 428 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 429 {
 430         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 431         pneg_ctxt->DataLength = cpu_to_le16(38);
 432         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 433         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_LINUX_CLIENT_SALT_SIZE);
 434         get_random_bytes(pneg_ctxt->Salt, SMB311_LINUX_CLIENT_SALT_SIZE);
 435         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 436 }
 437
 438 static void
 439 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 440 {
 441         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 442         pneg_ctxt->DataLength =
 443                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 444                           - sizeof(struct smb2_neg_context));
 445         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 446         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 447         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 448         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 449 }
 450
 451 static void
 452 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 453 {
 454         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 455         if (require_gcm_256) {
 456                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 457                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 458                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 459         } else if (enable_gcm_256) {
 460                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 461                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 462                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 463                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 464                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 465         } else {
 466                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 467                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 468                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 469                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 470         }
 471 }
 472
 473 static unsigned int
 474 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 475 {
 476         struct nls_table *cp = load_nls_default();
 477
 478         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 479
 480         /* copy up to max of first 100 bytes of server name to NetName field */
 481         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 482         /* context size is DataLength + minimal smb2_neg_context */
 483         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 484                         sizeof(struct smb2_neg_context), 8) * 8;
 485 }
 486
 487 static void
 488 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 489 {
 490         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 491         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 492         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 493         pneg_ctxt->Name[0] = 0x93;
 494         pneg_ctxt->Name[1] = 0xAD;
 495         pneg_ctxt->Name[2] = 0x25;
 496         pneg_ctxt->Name[3] = 0x50;
 497         pneg_ctxt->Name[4] = 0x9C;
 498         pneg_ctxt->Name[5] = 0xB4;
 499         pneg_ctxt->Name[6] = 0x11;
 500         pneg_ctxt->Name[7] = 0xE7;
 501         pneg_ctxt->Name[8] = 0xB4;
 502         pneg_ctxt->Name[9] = 0x23;
 503         pneg_ctxt->Name[10] = 0x83;
 504         pneg_ctxt->Name[11] = 0xDE;
 505         pneg_ctxt->Name[12] = 0x96;
 506         pneg_ctxt->Name[13] = 0x8B;
 507         pneg_ctxt->Name[14] = 0xCD;
 508         pneg_ctxt->Name[15] = 0x7C;
 509 }
 510
 511 static void
 512 assemble_neg_contexts(struct smb2_negotiate_req *req,
 513                       struct TCP_Server_Info *server, unsigned int *total_len)
 514 {
 515         char *pneg_ctxt;
 516         unsigned int ctxt_len;
 517
 518         if (*total_len > 200) {
 519                 /* In case length corrupted don't want to overrun smb buffer */
 520                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 521                 return;
 522         }
 523
 524         /*
 525          * round up total_len of fixed part of SMB3 negotiate request to 8
 526          * byte boundary before adding negotiate contexts
 527          */
 528         *total_len = roundup(*total_len, 8);
 529
 530         pneg_ctxt = (*total_len) + (char *)req;
 531         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 532
 533         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 534         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 535         *total_len += ctxt_len;
 536         pneg_ctxt += ctxt_len;
 537
 538         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 539         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 540         *total_len += ctxt_len;
 541         pneg_ctxt += ctxt_len;
 542
 543         if (server->compress_algorithm) {
 544                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 545                                 pneg_ctxt);
 546                 ctxt_len = DIV_ROUND_UP(
 547                         sizeof(struct smb2_compression_capabilities_context),
 548                                 8) * 8;
 549                 *total_len += ctxt_len;
 550                 pneg_ctxt += ctxt_len;
 551                 req->NegotiateContextCount = cpu_to_le16(5);
 552         } else
 553                 req->NegotiateContextCount = cpu_to_le16(4);
 554
 555         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 556                                         server->hostname);
 557         *total_len += ctxt_len;
 558         pneg_ctxt += ctxt_len;
 559
 560         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 561         *total_len += sizeof(struct smb2_posix_neg_context);
 562 }
 563
 564 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 565 {
 566         unsigned int len = le16_to_cpu(ctxt->DataLength);
 567
 568         /* If invalid preauth context warn but use what we requested, SHA-512 */
 569         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 570                 pr_warn_once("server sent bad preauth context\n");
 571                 return;
 572         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 573                 pr_warn_once("server sent invalid SaltLength\n");
 574                 return;
 575         }
 576         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 577                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 578         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 579                 pr_warn_once("unknown SMB3 hash algorithm\n");
 580 }
 581
 582 static void decode_compress_ctx(struct TCP_Server_Info *server,
 583                          struct smb2_compression_capabilities_context *ctxt)
 584 {
 585         unsigned int len = le16_to_cpu(ctxt->DataLength);
 586
 587         /* sizeof compress context is a one element compression capbility struct */
 588         if (len < 10) {
 589                 pr_warn_once("server sent bad compression cntxt\n");
 590                 return;
 591         }
 592         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 593                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 594                 return;
 595         }
 596         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 597                 pr_warn_once("unknown compression algorithm\n");
 598                 return;
 599         }
 600         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 601 }
 602
 603 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 604                               struct smb2_encryption_neg_context *ctxt)
 605 {
 606         unsigned int len = le16_to_cpu(ctxt->DataLength);
 607
 608         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 609         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 610                 pr_warn_once("server sent bad crypto ctxt len\n");
 611                 return -EINVAL;
 612         }
 613
 614         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 615                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 616                 return -EINVAL;
 617         }
 618         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 619         if (require_gcm_256) {
 620                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 621                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 622                         return -EOPNOTSUPP;
 623                 }
 624         } else if (ctxt->Ciphers[0] == 0) {
 625                 /*
 626                  * e.g. if server only supported AES256_CCM (very unlikely)
 627                  * or server supported no encryption types or had all disabled.
 628                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 629                  * in which mount requested encryption ("seal") checks later
 630                  * on during tree connection will return proper rc, but if
 631                  * seal not requested by client, since server is allowed to
 632                  * return 0 to indicate no supported cipher, we can't fail here
 633                  */
 634                 server->cipher_type = 0;
 635                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 636                 pr_warn_once("Server does not support requested encryption types\n");
 637                 return 0;
 638         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 639                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 640                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 641                 /* server returned a cipher we didn't ask for */
 642                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 643                 return -EINVAL;
 644         }
 645         server->cipher_type = ctxt->Ciphers[0];
 646         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 647         return 0;
 648 }
 649
 650 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 651                                      struct TCP_Server_Info *server,
 652                                      unsigned int len_of_smb)
 653 {
 654         struct smb2_neg_context *pctx;
 655         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 656         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 657         unsigned int len_of_ctxts, i;
 658         int rc = 0;
 659
 660         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 661         if (len_of_smb <= offset) {
 662                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 663                 return -EINVAL;
 664         }
 665
 666         len_of_ctxts = len_of_smb - offset;
 667
 668         for (i = 0; i < ctxt_cnt; i++) {
 669                 int clen;
 670                 /* check that offset is not beyond end of SMB */
 671                 if (len_of_ctxts == 0)
 672                         break;
 673
 674                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 675                         break;
 676
 677                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 678                 clen = le16_to_cpu(pctx->DataLength);
 679                 if (clen > len_of_ctxts)
 680                         break;
 681
 682                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 683                         decode_preauth_context(
 684                                 (struct smb2_preauth_neg_context *)pctx);
 685                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 686                         rc = decode_encrypt_ctx(server,
 687                                 (struct smb2_encryption_neg_context *)pctx);
 688                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 689                         decode_compress_ctx(server,
 690                                 (struct smb2_compression_capabilities_context *)pctx);
 691                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 692                         server->posix_ext_supported = true;
 693                 else
 694                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 695                                 le16_to_cpu(pctx->ContextType));
 696
 697                 if (rc)
 698                         break;
 699                 /* offsets must be 8 byte aligned */
 700                 clen = (clen + 7) & ~0x7;
 701                 offset += clen + sizeof(struct smb2_neg_context);
 702                 len_of_ctxts -= clen;
 703         }
 704         return rc;
 705 }
 706
 707 static struct create_posix *
 708 create_posix_buf(umode_t mode)
 709 {
 710         struct create_posix *buf;
 711
 712         buf = kzalloc(sizeof(struct create_posix),
 713                         GFP_KERNEL);
 714         if (!buf)
 715                 return NULL;
 716
 717         buf->ccontext.DataOffset =
 718                 cpu_to_le16(offsetof(struct create_posix, Mode));
 719         buf->ccontext.DataLength = cpu_to_le32(4);
 720         buf->ccontext.NameOffset =
 721                 cpu_to_le16(offsetof(struct create_posix, Name));
 722         buf->ccontext.NameLength = cpu_to_le16(16);
 723
 724         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 725         buf->Name[0] = 0x93;
 726         buf->Name[1] = 0xAD;
 727         buf->Name[2] = 0x25;
 728         buf->Name[3] = 0x50;
 729         buf->Name[4] = 0x9C;
 730         buf->Name[5] = 0xB4;
 731         buf->Name[6] = 0x11;
 732         buf->Name[7] = 0xE7;
 733         buf->Name[8] = 0xB4;
 734         buf->Name[9] = 0x23;
 735         buf->Name[10] = 0x83;
 736         buf->Name[11] = 0xDE;
 737         buf->Name[12] = 0x96;
 738         buf->Name[13] = 0x8B;
 739         buf->Name[14] = 0xCD;
 740         buf->Name[15] = 0x7C;
 741         buf->Mode = cpu_to_le32(mode);
 742         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 743         return buf;
 744 }
 745
 746 static int
 747 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 748 {
 749         struct smb2_create_req *req = iov[0].iov_base;
 750         unsigned int num = *num_iovec;
 751
 752         iov[num].iov_base = create_posix_buf(mode);
 753         if (mode == ACL_NO_MODE)
 754                 cifs_dbg(FYI, "Invalid mode\n");
 755         if (iov[num].iov_base == NULL)
 756                 return -ENOMEM;
 757         iov[num].iov_len = sizeof(struct create_posix);
 758         if (!req->CreateContextsOffset)
 759                 req->CreateContextsOffset = cpu_to_le32(
 760                                 sizeof(struct smb2_create_req) +
 761                                 iov[num - 1].iov_len);
 762         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 763         *num_iovec = num + 1;
 764         return 0;
 765 }
 766
 767
 768 /*
 769  *
 770  *      SMB2 Worker functions follow:
 771  *
 772  *      The general structure of the worker functions is:
 773  *      1) Call smb2_init (assembles SMB2 header)
 774  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 775  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 776  *      4) Decode SMB2 command specific fields in the fixed length area
 777  *      5) Decode variable length data area (if any for this SMB2 command type)
 778  *      6) Call free smb buffer
 779  *      7) return
 780  *
 781  */
 782
 783 int
 784 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 785 {
 786         struct smb_rqst rqst;
 787         struct smb2_negotiate_req *req;
 788         struct smb2_negotiate_rsp *rsp;
 789         struct kvec iov[1];
 790         struct kvec rsp_iov;
 791         int rc = 0;
 792         int resp_buftype;
 793         struct TCP_Server_Info *server = cifs_ses_server(ses);
 794         int blob_offset, blob_length;
 795         char *security_blob;
 796         int flags = CIFS_NEG_OP;
 797         unsigned int total_len;
 798
 799         cifs_dbg(FYI, "Negotiate protocol\n");
 800
 801         if (!server) {
 802                 WARN(1, "%s: server is NULL!\n", __func__);
 803                 return -EIO;
 804         }
 805
 806         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 807                                  (void **) &req, &total_len);
 808         if (rc)
 809                 return rc;
 810
 811         req->sync_hdr.SessionId = 0;
 812
 813         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 814         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 815
 816         if (strcmp(server->vals->version_string,
 817                    SMB3ANY_VERSION_STRING) == 0) {
 818                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 819                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 820                 req->DialectCount = cpu_to_le16(2);
 821                 total_len += 4;
 822         } else if (strcmp(server->vals->version_string,
 823                    SMBDEFAULT_VERSION_STRING) == 0) {
 824                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 825                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 826                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 827                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 828                 req->DialectCount = cpu_to_le16(4);
 829                 total_len += 8;
 830         } else {
 831                 /* otherwise send specific dialect */
 832                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 833                 req->DialectCount = cpu_to_le16(1);
 834                 total_len += 2;
 835         }
 836
 837         /* only one of SMB2 signing flags may be set in SMB2 request */
 838         if (ses->sign)
 839                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 840         else if (global_secflags & CIFSSEC_MAY_SIGN)
 841                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 842         else
 843                 req->SecurityMode = 0;
 844
 845         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 846         if (ses->chan_max > 1)
 847                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
 848
 849         /* ClientGUID must be zero for SMB2.02 dialect */
 850         if (server->vals->protocol_id == SMB20_PROT_ID)
 851                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 852         else {
 853                 memcpy(req->ClientGUID, server->client_guid,
 854                         SMB2_CLIENT_GUID_SIZE);
 855                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 856                     (strcmp(server->vals->version_string,
 857                      SMBDEFAULT_VERSION_STRING) == 0))
 858                         assemble_neg_contexts(req, server, &total_len);
 859         }
 860         iov[0].iov_base = (char *)req;
 861         iov[0].iov_len = total_len;
 862
 863         memset(&rqst, 0, sizeof(struct smb_rqst));
 864         rqst.rq_iov = iov;
 865         rqst.rq_nvec = 1;
 866
 867         rc = cifs_send_recv(xid, ses, server,
 868                             &rqst, &resp_buftype, flags, &rsp_iov);
 869         cifs_small_buf_release(req);
 870         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 871         /*
 872          * No tcon so can't do
 873          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 874          */
 875         if (rc == -EOPNOTSUPP) {
 876                 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");
 877                 goto neg_exit;
 878         } else if (rc != 0)
 879                 goto neg_exit;
 880
 881         if (strcmp(server->vals->version_string,
 882                    SMB3ANY_VERSION_STRING) == 0) {
 883                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 884                         cifs_server_dbg(VFS,
 885                                 "SMB2 dialect returned but not requested\n");
 886                         return -EIO;
 887                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 888                         cifs_server_dbg(VFS,
 889                                 "SMB2.1 dialect returned but not requested\n");
 890                         return -EIO;
 891                 }
 892         } else if (strcmp(server->vals->version_string,
 893                    SMBDEFAULT_VERSION_STRING) == 0) {
 894                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 895                         cifs_server_dbg(VFS,
 896                                 "SMB2 dialect returned but not requested\n");
 897                         return -EIO;
 898                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 899                         /* ops set to 3.0 by default for default so update */
 900                         server->ops = &smb21_operations;
 901                         server->vals = &smb21_values;
 902                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 903                         server->ops = &smb311_operations;
 904                         server->vals = &smb311_values;
 905                 }
 906         } else if (le16_to_cpu(rsp->DialectRevision) !=
 907                                 server->vals->protocol_id) {
 908                 /* if requested single dialect ensure returned dialect matched */
 909                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 910                                 le16_to_cpu(rsp->DialectRevision));
 911                 return -EIO;
 912         }
 913
 914         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 915
 916         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 917                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 918         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 919                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 920         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 921                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 922         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 923                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 924         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 925                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 926         else {
 927                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
 928                                 le16_to_cpu(rsp->DialectRevision));
 929                 rc = -EIO;
 930                 goto neg_exit;
 931         }
 932         server->dialect = le16_to_cpu(rsp->DialectRevision);
 933
 934         /*
 935          * Keep a copy of the hash after negprot. This hash will be
 936          * the starting hash value for all sessions made from this
 937          * server.
 938          */
 939         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 940                SMB2_PREAUTH_HASH_SIZE);
 941
 942         /* SMB2 only has an extended negflavor */
 943         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 944         /* set it to the maximum buffer size value we can send with 1 credit */
 945         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 946                                SMB2_MAX_BUFFER_SIZE);
 947         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 948         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 949         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 950         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 951                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 952                                 server->sec_mode);
 953         server->capabilities = le32_to_cpu(rsp->Capabilities);
 954         /* Internal types */
 955         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 956
 957         /*
 958          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
 959          * Set the cipher type manually.
 960          */
 961         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
 962                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
 963
 964         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 965                                                (struct smb2_sync_hdr *)rsp);
 966         /*
 967          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 968          * for us will be
 969          *      ses->sectype = RawNTLMSSP;
 970          * but for time being this is our only auth choice so doesn't matter.
 971          * We just found a server which sets blob length to zero expecting raw.
 972          */
 973         if (blob_length == 0) {
 974                 cifs_dbg(FYI, "missing security blob on negprot\n");
 975                 server->sec_ntlmssp = true;
 976         }
 977
 978         rc = cifs_enable_signing(server, ses->sign);
 979         if (rc)
 980                 goto neg_exit;
 981         if (blob_length) {
 982                 rc = decode_negTokenInit(security_blob, blob_length, server);
 983                 if (rc == 1)
 984                         rc = 0;
 985                 else if (rc == 0)
 986                         rc = -EIO;
 987         }
 988
 989         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 990                 if (rsp->NegotiateContextCount)
 991                         rc = smb311_decode_neg_context(rsp, server,
 992                                                        rsp_iov.iov_len);
 993                 else
 994                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
 995         }
 996 neg_exit:
 997         free_rsp_buf(resp_buftype, rsp);
 998         return rc;
 999 }
1000
1001 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1002 {
1003         int rc;
1004         struct validate_negotiate_info_req *pneg_inbuf;
1005         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1006         u32 rsplen;
1007         u32 inbuflen; /* max of 4 dialects */
1008         struct TCP_Server_Info *server = tcon->ses->server;
1009
1010         cifs_dbg(FYI, "validate negotiate\n");
1011
1012         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1013         if (server->dialect == SMB311_PROT_ID)
1014                 return 0;
1015
1016         /*
1017          * validation ioctl must be signed, so no point sending this if we
1018          * can not sign it (ie are not known user).  Even if signing is not
1019          * required (enabled but not negotiated), in those cases we selectively
1020          * sign just this, the first and only signed request on a connection.
1021          * Having validation of negotiate info  helps reduce attack vectors.
1022          */
1023         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1024                 return 0; /* validation requires signing */
1025
1026         if (tcon->ses->user_name == NULL) {
1027                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1028                 return 0; /* validation requires signing */
1029         }
1030
1031         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1032                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1033
1034         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1035         if (!pneg_inbuf)
1036                 return -ENOMEM;
1037
1038         pneg_inbuf->Capabilities =
1039                         cpu_to_le32(server->vals->req_capabilities);
1040         if (tcon->ses->chan_max > 1)
1041                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1042
1043         memcpy(pneg_inbuf->Guid, server->client_guid,
1044                                         SMB2_CLIENT_GUID_SIZE);
1045
1046         if (tcon->ses->sign)
1047                 pneg_inbuf->SecurityMode =
1048                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1049         else if (global_secflags & CIFSSEC_MAY_SIGN)
1050                 pneg_inbuf->SecurityMode =
1051                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1052         else
1053                 pneg_inbuf->SecurityMode = 0;
1054
1055
1056         if (strcmp(server->vals->version_string,
1057                 SMB3ANY_VERSION_STRING) == 0) {
1058                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1059                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1060                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1061                 /* structure is big enough for 3 dialects, sending only 2 */
1062                 inbuflen = sizeof(*pneg_inbuf) -
1063                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1064         } else if (strcmp(server->vals->version_string,
1065                 SMBDEFAULT_VERSION_STRING) == 0) {
1066                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1067                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1068                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1069                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1070                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1071                 /* structure is big enough for 3 dialects */
1072                 inbuflen = sizeof(*pneg_inbuf);
1073         } else {
1074                 /* otherwise specific dialect was requested */
1075                 pneg_inbuf->Dialects[0] =
1076                         cpu_to_le16(server->vals->protocol_id);
1077                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1078                 /* structure is big enough for 4 dialects, sending only 1 */
1079                 inbuflen = sizeof(*pneg_inbuf) -
1080                                 sizeof(pneg_inbuf->Dialects[0]) * 3;
1081         }
1082
1083         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1084                 FSCTL_VALIDATE_NEGOTIATE_INFO,
1085                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1086                 (char **)&pneg_rsp, &rsplen);
1087         if (rc == -EOPNOTSUPP) {
1088                 /*
1089                  * Old Windows versions or Netapp SMB server can return
1090                  * not supported error. Client should accept it.
1091                  */
1092                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1093                 rc = 0;
1094                 goto out_free_inbuf;
1095         } else if (rc != 0) {
1096                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1097                               rc);
1098                 rc = -EIO;
1099                 goto out_free_inbuf;
1100         }
1101
1102         rc = -EIO;
1103         if (rsplen != sizeof(*pneg_rsp)) {
1104                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1105                               rsplen);
1106
1107                 /* relax check since Mac returns max bufsize allowed on ioctl */
1108                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1109                         goto out_free_rsp;
1110         }
1111
1112         /* check validate negotiate info response matches what we got earlier */
1113         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1114                 goto vneg_out;
1115
1116         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1117                 goto vneg_out;
1118
1119         /* do not validate server guid because not saved at negprot time yet */
1120
1121         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1122               SMB2_LARGE_FILES) != server->capabilities)
1123                 goto vneg_out;
1124
1125         /* validate negotiate successful */
1126         rc = 0;
1127         cifs_dbg(FYI, "validate negotiate info successful\n");
1128         goto out_free_rsp;
1129
1130 vneg_out:
1131         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1132 out_free_rsp:
1133         kfree(pneg_rsp);
1134 out_free_inbuf:
1135         kfree(pneg_inbuf);
1136         return rc;
1137 }
1138
1139 enum securityEnum
1140 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1141 {
1142         switch (requested) {
1143         case Kerberos:
1144         case RawNTLMSSP:
1145                 return requested;
1146         case NTLMv2:
1147                 return RawNTLMSSP;
1148         case Unspecified:
1149                 if (server->sec_ntlmssp &&
1150                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1151                         return RawNTLMSSP;
1152                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1153                         (global_secflags & CIFSSEC_MAY_KRB5))
1154                         return Kerberos;
1155                 fallthrough;
1156         default:
1157                 return Unspecified;
1158         }
1159 }
1160
1161 struct SMB2_sess_data {
1162         unsigned int xid;
1163         struct cifs_ses *ses;
1164         struct nls_table *nls_cp;
1165         void (*func)(struct SMB2_sess_data *);
1166         int result;
1167         u64 previous_session;
1168
1169         /* we will send the SMB in three pieces:
1170          * a fixed length beginning part, an optional
1171          * SPNEGO blob (which can be zero length), and a
1172          * last part which will include the strings
1173          * and rest of bcc area. This allows us to avoid
1174          * a large buffer 17K allocation
1175          */
1176         int buf0_type;
1177         struct kvec iov[2];
1178 };
1179
1180 static int
1181 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1182 {
1183         int rc;
1184         struct cifs_ses *ses = sess_data->ses;
1185         struct smb2_sess_setup_req *req;
1186         struct TCP_Server_Info *server = cifs_ses_server(ses);
1187         unsigned int total_len;
1188
1189         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1190                                  (void **) &req,
1191                                  &total_len);
1192         if (rc)
1193                 return rc;
1194
1195         if (sess_data->ses->binding) {
1196                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1197                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1198                 req->PreviousSessionId = 0;
1199                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1200         } else {
1201                 /* First session, not a reauthenticate */
1202                 req->sync_hdr.SessionId = 0;
1203                 /*
1204                  * if reconnect, we need to send previous sess id
1205                  * otherwise it is 0
1206                  */
1207                 req->PreviousSessionId = sess_data->previous_session;
1208                 req->Flags = 0; /* MBZ */
1209         }
1210
1211         /* enough to enable echos and oplocks and one max size write */
1212         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1213
1214         /* only one of SMB2 signing flags may be set in SMB2 request */
1215         if (server->sign)
1216                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1217         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1218                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1219         else
1220                 req->SecurityMode = 0;
1221
1222 #ifdef CONFIG_CIFS_DFS_UPCALL
1223         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1224 #else
1225         req->Capabilities = 0;
1226 #endif /* DFS_UPCALL */
1227
1228         req->Channel = 0; /* MBZ */
1229
1230         sess_data->iov[0].iov_base = (char *)req;
1231         /* 1 for pad */
1232         sess_data->iov[0].iov_len = total_len - 1;
1233         /*
1234          * This variable will be used to clear the buffer
1235          * allocated above in case of any error in the calling function.
1236          */
1237         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1238
1239         return 0;
1240 }
1241
1242 static void
1243 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1244 {
1245         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1246         sess_data->buf0_type = CIFS_NO_BUFFER;
1247 }
1248
1249 static int
1250 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1251 {
1252         int rc;
1253         struct smb_rqst rqst;
1254         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1255         struct kvec rsp_iov = { NULL, 0 };
1256
1257         /* Testing shows that buffer offset must be at location of Buffer[0] */
1258         req->SecurityBufferOffset =
1259                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1260         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1261
1262         memset(&rqst, 0, sizeof(struct smb_rqst));
1263         rqst.rq_iov = sess_data->iov;
1264         rqst.rq_nvec = 2;
1265
1266         /* BB add code to build os and lm fields */
1267         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1268                             cifs_ses_server(sess_data->ses),
1269                             &rqst,
1270                             &sess_data->buf0_type,
1271                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1272         cifs_small_buf_release(sess_data->iov[0].iov_base);
1273         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1274
1275         return rc;
1276 }
1277
1278 static int
1279 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1280 {
1281         int rc = 0;
1282         struct cifs_ses *ses = sess_data->ses;
1283         struct TCP_Server_Info *server = cifs_ses_server(ses);
1284
1285         mutex_lock(&server->srv_mutex);
1286         if (server->ops->generate_signingkey) {
1287                 rc = server->ops->generate_signingkey(ses);
1288                 if (rc) {
1289                         cifs_dbg(FYI,
1290                                 "SMB3 session key generation failed\n");
1291                         mutex_unlock(&server->srv_mutex);
1292                         return rc;
1293                 }
1294         }
1295         if (!server->session_estab) {
1296                 server->sequence_number = 0x2;
1297                 server->session_estab = true;
1298         }
1299         mutex_unlock(&server->srv_mutex);
1300
1301         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1302         /* keep existing ses state if binding */
1303         if (!ses->binding) {
1304                 spin_lock(&GlobalMid_Lock);
1305                 ses->status = CifsGood;
1306                 ses->need_reconnect = false;
1307                 spin_unlock(&GlobalMid_Lock);
1308         }
1309
1310         return rc;
1311 }
1312
1313 #ifdef CONFIG_CIFS_UPCALL
1314 static void
1315 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1316 {
1317         int rc;
1318         struct cifs_ses *ses = sess_data->ses;
1319         struct cifs_spnego_msg *msg;
1320         struct key *spnego_key = NULL;
1321         struct smb2_sess_setup_rsp *rsp = NULL;
1322
1323         rc = SMB2_sess_alloc_buffer(sess_data);
1324         if (rc)
1325                 goto out;
1326
1327         spnego_key = cifs_get_spnego_key(ses);
1328         if (IS_ERR(spnego_key)) {
1329                 rc = PTR_ERR(spnego_key);
1330                 if (rc == -ENOKEY)
1331                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1332                 spnego_key = NULL;
1333                 goto out;
1334         }
1335
1336         msg = spnego_key->payload.data[0];
1337         /*
1338          * check version field to make sure that cifs.upcall is
1339          * sending us a response in an expected form
1340          */
1341         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1342                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1343                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1344                 rc = -EKEYREJECTED;
1345                 goto out_put_spnego_key;
1346         }
1347
1348         /* keep session key if binding */
1349         if (!ses->binding) {
1350                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1351                                                  GFP_KERNEL);
1352                 if (!ses->auth_key.response) {
1353                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1354                                  msg->sesskey_len);
1355                         rc = -ENOMEM;
1356                         goto out_put_spnego_key;
1357                 }
1358                 ses->auth_key.len = msg->sesskey_len;
1359         }
1360
1361         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1362         sess_data->iov[1].iov_len = msg->secblob_len;
1363
1364         rc = SMB2_sess_sendreceive(sess_data);
1365         if (rc)
1366                 goto out_put_spnego_key;
1367
1368         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1369         /* keep session id and flags if binding */
1370         if (!ses->binding) {
1371                 ses->Suid = rsp->sync_hdr.SessionId;
1372                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1373         }
1374
1375         rc = SMB2_sess_establish_session(sess_data);
1376 out_put_spnego_key:
1377         key_invalidate(spnego_key);
1378         key_put(spnego_key);
1379 out:
1380         sess_data->result = rc;
1381         sess_data->func = NULL;
1382         SMB2_sess_free_buffer(sess_data);
1383 }
1384 #else
1385 static void
1386 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1387 {
1388         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1389         sess_data->result = -EOPNOTSUPP;
1390         sess_data->func = NULL;
1391 }
1392 #endif
1393
1394 static void
1395 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1396
1397 static void
1398 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1399 {
1400         int rc;
1401         struct cifs_ses *ses = sess_data->ses;
1402         struct smb2_sess_setup_rsp *rsp = NULL;
1403         char *ntlmssp_blob = NULL;
1404         bool use_spnego = false; /* else use raw ntlmssp */
1405         u16 blob_length = 0;
1406
1407         /*
1408          * If memory allocation is successful, caller of this function
1409          * frees it.
1410          */
1411         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1412         if (!ses->ntlmssp) {
1413                 rc = -ENOMEM;
1414                 goto out_err;
1415         }
1416         ses->ntlmssp->sesskey_per_smbsess = true;
1417
1418         rc = SMB2_sess_alloc_buffer(sess_data);
1419         if (rc)
1420                 goto out_err;
1421
1422         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1423                                GFP_KERNEL);
1424         if (ntlmssp_blob == NULL) {
1425                 rc = -ENOMEM;
1426                 goto out;
1427         }
1428
1429         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1430         if (use_spnego) {
1431                 /* BB eventually need to add this */
1432                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1433                 rc = -EOPNOTSUPP;
1434                 goto out;
1435         } else {
1436                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1437                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1438         }
1439         sess_data->iov[1].iov_base = ntlmssp_blob;
1440         sess_data->iov[1].iov_len = blob_length;
1441
1442         rc = SMB2_sess_sendreceive(sess_data);
1443         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1444
1445         /* If true, rc here is expected and not an error */
1446         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1447                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1448                 rc = 0;
1449
1450         if (rc)
1451                 goto out;
1452
1453         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1454                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1455                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1456                         le16_to_cpu(rsp->SecurityBufferOffset));
1457                 rc = -EIO;
1458                 goto out;
1459         }
1460         rc = decode_ntlmssp_challenge(rsp->Buffer,
1461                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1462         if (rc)
1463                 goto out;
1464
1465         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1466
1467         /* keep existing ses id and flags if binding */
1468         if (!ses->binding) {
1469                 ses->Suid = rsp->sync_hdr.SessionId;
1470                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1471         }
1472
1473 out:
1474         kfree(ntlmssp_blob);
1475         SMB2_sess_free_buffer(sess_data);
1476         if (!rc) {
1477                 sess_data->result = 0;
1478                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1479                 return;
1480         }
1481 out_err:
1482         kfree(ses->ntlmssp);
1483         ses->ntlmssp = NULL;
1484         sess_data->result = rc;
1485         sess_data->func = NULL;
1486 }
1487
1488 static void
1489 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1490 {
1491         int rc;
1492         struct cifs_ses *ses = sess_data->ses;
1493         struct smb2_sess_setup_req *req;
1494         struct smb2_sess_setup_rsp *rsp = NULL;
1495         unsigned char *ntlmssp_blob = NULL;
1496         bool use_spnego = false; /* else use raw ntlmssp */
1497         u16 blob_length = 0;
1498
1499         rc = SMB2_sess_alloc_buffer(sess_data);
1500         if (rc)
1501                 goto out;
1502
1503         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1504         req->sync_hdr.SessionId = ses->Suid;
1505
1506         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1507                                         sess_data->nls_cp);
1508         if (rc) {
1509                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1510                 goto out;
1511         }
1512
1513         if (use_spnego) {
1514                 /* BB eventually need to add this */
1515                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1516                 rc = -EOPNOTSUPP;
1517                 goto out;
1518         }
1519         sess_data->iov[1].iov_base = ntlmssp_blob;
1520         sess_data->iov[1].iov_len = blob_length;
1521
1522         rc = SMB2_sess_sendreceive(sess_data);
1523         if (rc)
1524                 goto out;
1525
1526         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1527
1528         /* keep existing ses id and flags if binding */
1529         if (!ses->binding) {
1530                 ses->Suid = rsp->sync_hdr.SessionId;
1531                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1532         }
1533
1534         rc = SMB2_sess_establish_session(sess_data);
1535 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1536         if (ses->server->dialect < SMB30_PROT_ID) {
1537                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1538                 /*
1539                  * The session id is opaque in terms of endianness, so we can't
1540                  * print it as a long long. we dump it as we got it on the wire
1541                  */
1542                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1543                          &ses->Suid);
1544                 cifs_dbg(VFS, "Session Key   %*ph\n",
1545                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1546                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1547                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1548         }
1549 #endif
1550 out:
1551         kfree(ntlmssp_blob);
1552         SMB2_sess_free_buffer(sess_data);
1553         kfree(ses->ntlmssp);
1554         ses->ntlmssp = NULL;
1555         sess_data->result = rc;
1556         sess_data->func = NULL;
1557 }
1558
1559 static int
1560 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1561 {
1562         int type;
1563
1564         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1565         cifs_dbg(FYI, "sess setup type %d\n", type);
1566         if (type == Unspecified) {
1567                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1568                 return -EINVAL;
1569         }
1570
1571         switch (type) {
1572         case Kerberos:
1573                 sess_data->func = SMB2_auth_kerberos;
1574                 break;
1575         case RawNTLMSSP:
1576                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1577                 break;
1578         default:
1579                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1580                 return -EOPNOTSUPP;
1581         }
1582
1583         return 0;
1584 }
1585
1586 int
1587 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1588                 const struct nls_table *nls_cp)
1589 {
1590         int rc = 0;
1591         struct TCP_Server_Info *server = cifs_ses_server(ses);
1592         struct SMB2_sess_data *sess_data;
1593
1594         cifs_dbg(FYI, "Session Setup\n");
1595
1596         if (!server) {
1597                 WARN(1, "%s: server is NULL!\n", __func__);
1598                 return -EIO;
1599         }
1600
1601         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1602         if (!sess_data)
1603                 return -ENOMEM;
1604
1605         rc = SMB2_select_sec(ses, sess_data);
1606         if (rc)
1607                 goto out;
1608         sess_data->xid = xid;
1609         sess_data->ses = ses;
1610         sess_data->buf0_type = CIFS_NO_BUFFER;
1611         sess_data->nls_cp = (struct nls_table *) nls_cp;
1612         sess_data->previous_session = ses->Suid;
1613
1614         /*
1615          * Initialize the session hash with the server one.
1616          */
1617         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1618                SMB2_PREAUTH_HASH_SIZE);
1619
1620         while (sess_data->func)
1621                 sess_data->func(sess_data);
1622
1623         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1624                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1625         rc = sess_data->result;
1626 out:
1627         kfree(sess_data);
1628         return rc;
1629 }
1630
1631 int
1632 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1633 {
1634         struct smb_rqst rqst;
1635         struct smb2_logoff_req *req; /* response is also trivial struct */
1636         int rc = 0;
1637         struct TCP_Server_Info *server;
1638         int flags = 0;
1639         unsigned int total_len;
1640         struct kvec iov[1];
1641         struct kvec rsp_iov;
1642         int resp_buf_type;
1643
1644         cifs_dbg(FYI, "disconnect session %p\n", ses);
1645
1646         if (ses && (ses->server))
1647                 server = ses->server;
1648         else
1649                 return -EIO;
1650
1651         /* no need to send SMB logoff if uid already closed due to reconnect */
1652         if (ses->need_reconnect)
1653                 goto smb2_session_already_dead;
1654
1655         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1656                                  (void **) &req, &total_len);
1657         if (rc)
1658                 return rc;
1659
1660          /* since no tcon, smb2_init can not do this, so do here */
1661         req->sync_hdr.SessionId = ses->Suid;
1662
1663         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1664                 flags |= CIFS_TRANSFORM_REQ;
1665         else if (server->sign)
1666                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1667
1668         flags |= CIFS_NO_RSP_BUF;
1669
1670         iov[0].iov_base = (char *)req;
1671         iov[0].iov_len = total_len;
1672
1673         memset(&rqst, 0, sizeof(struct smb_rqst));
1674         rqst.rq_iov = iov;
1675         rqst.rq_nvec = 1;
1676
1677         rc = cifs_send_recv(xid, ses, ses->server,
1678                             &rqst, &resp_buf_type, flags, &rsp_iov);
1679         cifs_small_buf_release(req);
1680         /*
1681          * No tcon so can't do
1682          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1683          */
1684
1685 smb2_session_already_dead:
1686         return rc;
1687 }
1688
1689 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1690 {
1691         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1692 }
1693
1694 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1695
1696 /* These are similar values to what Windows uses */
1697 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1698 {
1699         tcon->max_chunks = 256;
1700         tcon->max_bytes_chunk = 1048576;
1701         tcon->max_bytes_copy = 16777216;
1702 }
1703
1704 int
1705 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1706           struct cifs_tcon *tcon, const struct nls_table *cp)
1707 {
1708         struct smb_rqst rqst;
1709         struct smb2_tree_connect_req *req;
1710         struct smb2_tree_connect_rsp *rsp = NULL;
1711         struct kvec iov[2];
1712         struct kvec rsp_iov = { NULL, 0 };
1713         int rc = 0;
1714         int resp_buftype;
1715         int unc_path_len;
1716         __le16 *unc_path = NULL;
1717         int flags = 0;
1718         unsigned int total_len;
1719         struct TCP_Server_Info *server;
1720
1721         /* always use master channel */
1722         server = ses->server;
1723
1724         cifs_dbg(FYI, "TCON\n");
1725
1726         if (!server || !tree)
1727                 return -EIO;
1728
1729         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1730         if (unc_path == NULL)
1731                 return -ENOMEM;
1732
1733         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1734         unc_path_len *= 2;
1735         if (unc_path_len < 2) {
1736                 kfree(unc_path);
1737                 return -EINVAL;
1738         }
1739
1740         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1741         tcon->tid = 0;
1742         atomic_set(&tcon->num_remote_opens, 0);
1743         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1744                                  (void **) &req, &total_len);
1745         if (rc) {
1746                 kfree(unc_path);
1747                 return rc;
1748         }
1749
1750         if (smb3_encryption_required(tcon))
1751                 flags |= CIFS_TRANSFORM_REQ;
1752
1753         iov[0].iov_base = (char *)req;
1754         /* 1 for pad */
1755         iov[0].iov_len = total_len - 1;
1756
1757         /* Testing shows that buffer offset must be at location of Buffer[0] */
1758         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1759                         - 1 /* pad */);
1760         req->PathLength = cpu_to_le16(unc_path_len - 2);
1761         iov[1].iov_base = unc_path;
1762         iov[1].iov_len = unc_path_len;
1763
1764         /*
1765          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1766          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1767          * (Samba servers don't always set the flag so also check if null user)
1768          */
1769         if ((server->dialect == SMB311_PROT_ID) &&
1770             !smb3_encryption_required(tcon) &&
1771             !(ses->session_flags &
1772                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1773             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1774                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1775
1776         memset(&rqst, 0, sizeof(struct smb_rqst));
1777         rqst.rq_iov = iov;
1778         rqst.rq_nvec = 2;
1779
1780         /* Need 64 for max size write so ask for more in case not there yet */
1781         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1782
1783         rc = cifs_send_recv(xid, ses, server,
1784                             &rqst, &resp_buftype, flags, &rsp_iov);
1785         cifs_small_buf_release(req);
1786         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1787         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1788         if (rc != 0) {
1789                 if (tcon) {
1790                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1791                         tcon->need_reconnect = true;
1792                 }
1793                 goto tcon_error_exit;
1794         }
1795
1796         switch (rsp->ShareType) {
1797         case SMB2_SHARE_TYPE_DISK:
1798                 cifs_dbg(FYI, "connection to disk share\n");
1799                 break;
1800         case SMB2_SHARE_TYPE_PIPE:
1801                 tcon->pipe = true;
1802                 cifs_dbg(FYI, "connection to pipe share\n");
1803                 break;
1804         case SMB2_SHARE_TYPE_PRINT:
1805                 tcon->print = true;
1806                 cifs_dbg(FYI, "connection to printer\n");
1807                 break;
1808         default:
1809                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1810                 rc = -EOPNOTSUPP;
1811                 goto tcon_error_exit;
1812         }
1813
1814         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1815         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1816         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1817         tcon->tidStatus = CifsGood;
1818         tcon->need_reconnect = false;
1819         tcon->tid = rsp->sync_hdr.TreeId;
1820         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1821
1822         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1823             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1824                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1825
1826         if (tcon->seal &&
1827             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1828                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1829
1830         init_copy_chunk_defaults(tcon);
1831         if (server->ops->validate_negotiate)
1832                 rc = server->ops->validate_negotiate(xid, tcon);
1833 tcon_exit:
1834
1835         free_rsp_buf(resp_buftype, rsp);
1836         kfree(unc_path);
1837         return rc;
1838
1839 tcon_error_exit:
1840         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1841                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1842         }
1843         goto tcon_exit;
1844 }
1845
1846 int
1847 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1848 {
1849         struct smb_rqst rqst;
1850         struct smb2_tree_disconnect_req *req; /* response is trivial */
1851         int rc = 0;
1852         struct cifs_ses *ses = tcon->ses;
1853         int flags = 0;
1854         unsigned int total_len;
1855         struct kvec iov[1];
1856         struct kvec rsp_iov;
1857         int resp_buf_type;
1858
1859         cifs_dbg(FYI, "Tree Disconnect\n");
1860
1861         if (!ses || !(ses->server))
1862                 return -EIO;
1863
1864         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1865                 return 0;
1866
1867         close_shroot_lease(&tcon->crfid);
1868
1869         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1870                                  (void **) &req,
1871                                  &total_len);
1872         if (rc)
1873                 return rc;
1874
1875         if (smb3_encryption_required(tcon))
1876                 flags |= CIFS_TRANSFORM_REQ;
1877
1878         flags |= CIFS_NO_RSP_BUF;
1879
1880         iov[0].iov_base = (char *)req;
1881         iov[0].iov_len = total_len;
1882
1883         memset(&rqst, 0, sizeof(struct smb_rqst));
1884         rqst.rq_iov = iov;
1885         rqst.rq_nvec = 1;
1886
1887         rc = cifs_send_recv(xid, ses, ses->server,
1888                             &rqst, &resp_buf_type, flags, &rsp_iov);
1889         cifs_small_buf_release(req);
1890         if (rc)
1891                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1892
1893         return rc;
1894 }
1895
1896
1897 static struct create_durable *
1898 create_durable_buf(void)
1899 {
1900         struct create_durable *buf;
1901
1902         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1903         if (!buf)
1904                 return NULL;
1905
1906         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1907                                         (struct create_durable, Data));
1908         buf->ccontext.DataLength = cpu_to_le32(16);
1909         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1910                                 (struct create_durable, Name));
1911         buf->ccontext.NameLength = cpu_to_le16(4);
1912         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1913         buf->Name[0] = 'D';
1914         buf->Name[1] = 'H';
1915         buf->Name[2] = 'n';
1916         buf->Name[3] = 'Q';
1917         return buf;
1918 }
1919
1920 static struct create_durable *
1921 create_reconnect_durable_buf(struct cifs_fid *fid)
1922 {
1923         struct create_durable *buf;
1924
1925         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1926         if (!buf)
1927                 return NULL;
1928
1929         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1930                                         (struct create_durable, Data));
1931         buf->ccontext.DataLength = cpu_to_le32(16);
1932         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1933                                 (struct create_durable, Name));
1934         buf->ccontext.NameLength = cpu_to_le16(4);
1935         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1936         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1937         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1938         buf->Name[0] = 'D';
1939         buf->Name[1] = 'H';
1940         buf->Name[2] = 'n';
1941         buf->Name[3] = 'C';
1942         return buf;
1943 }
1944
1945 static void
1946 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1947 {
1948         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1949
1950         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1951                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1952         buf->IndexNumber = pdisk_id->DiskFileId;
1953 }
1954
1955 static void
1956 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
1957                  struct create_posix_rsp *posix)
1958 {
1959         int sid_len;
1960         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
1961         u8 *end = beg + le32_to_cpu(cc->DataLength);
1962         u8 *sid;
1963
1964         memset(posix, 0, sizeof(*posix));
1965
1966         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
1967         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
1968         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
1969
1970         sid = beg + 12;
1971         sid_len = posix_info_sid_size(sid, end);
1972         if (sid_len < 0) {
1973                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
1974                 return;
1975         }
1976         memcpy(&posix->owner, sid, sid_len);
1977
1978         sid = sid + sid_len;
1979         sid_len = posix_info_sid_size(sid, end);
1980         if (sid_len < 0) {
1981                 cifs_dbg(VFS, "bad group sid in posix create response\n");
1982                 return;
1983         }
1984         memcpy(&posix->group, sid, sid_len);
1985
1986         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
1987                  posix->nlink, posix->mode, posix->reparse_tag);
1988 }
1989
1990 void
1991 smb2_parse_contexts(struct TCP_Server_Info *server,
1992                     struct smb2_create_rsp *rsp,
1993                     unsigned int *epoch, char *lease_key, __u8 *oplock,
1994                     struct smb2_file_all_info *buf,
1995                     struct create_posix_rsp *posix)
1996 {
1997         char *data_offset;
1998         struct create_context *cc;
1999         unsigned int next;
2000         unsigned int remaining;
2001         char *name;
2002         static const char smb3_create_tag_posix[] = {
2003                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2004                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2005                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2006         };
2007
2008         *oplock = 0;
2009         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2010         remaining = le32_to_cpu(rsp->CreateContextsLength);
2011         cc = (struct create_context *)data_offset;
2012
2013         /* Initialize inode number to 0 in case no valid data in qfid context */
2014         if (buf)
2015                 buf->IndexNumber = 0;
2016
2017         while (remaining >= sizeof(struct create_context)) {
2018                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2019                 if (le16_to_cpu(cc->NameLength) == 4 &&
2020                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2021                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2022                                                            lease_key);
2023                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2024                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2025                         parse_query_id_ctxt(cc, buf);
2026                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2027                         if (posix &&
2028                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2029                                 parse_posix_ctxt(cc, buf, posix);
2030                 }
2031                 /* else {
2032                         cifs_dbg(FYI, "Context not matched with len %d\n",
2033                                 le16_to_cpu(cc->NameLength));
2034                         cifs_dump_mem("Cctxt name: ", name, 4);
2035                 } */
2036
2037                 next = le32_to_cpu(cc->Next);
2038                 if (!next)
2039                         break;
2040                 remaining -= next;
2041                 cc = (struct create_context *)((char *)cc + next);
2042         }
2043
2044         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2045                 *oplock = rsp->OplockLevel;
2046
2047         return;
2048 }
2049
2050 static int
2051 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2052                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2053 {
2054         struct smb2_create_req *req = iov[0].iov_base;
2055         unsigned int num = *num_iovec;
2056
2057         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2058         if (iov[num].iov_base == NULL)
2059                 return -ENOMEM;
2060         iov[num].iov_len = server->vals->create_lease_size;
2061         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2062         if (!req->CreateContextsOffset)
2063                 req->CreateContextsOffset = cpu_to_le32(
2064                                 sizeof(struct smb2_create_req) +
2065                                 iov[num - 1].iov_len);
2066         le32_add_cpu(&req->CreateContextsLength,
2067                      server->vals->create_lease_size);
2068         *num_iovec = num + 1;
2069         return 0;
2070 }
2071
2072 static struct create_durable_v2 *
2073 create_durable_v2_buf(struct cifs_open_parms *oparms)
2074 {
2075         struct cifs_fid *pfid = oparms->fid;
2076         struct create_durable_v2 *buf;
2077
2078         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2079         if (!buf)
2080                 return NULL;
2081
2082         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2083                                         (struct create_durable_v2, dcontext));
2084         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2085         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2086                                 (struct create_durable_v2, Name));
2087         buf->ccontext.NameLength = cpu_to_le16(4);
2088
2089         /*
2090          * NB: Handle timeout defaults to 0, which allows server to choose
2091          * (most servers default to 120 seconds) and most clients default to 0.
2092          * This can be overridden at mount ("handletimeout=") if the user wants
2093          * a different persistent (or resilient) handle timeout for all opens
2094          * opens on a particular SMB3 mount.
2095          */
2096         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2097         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2098         generate_random_uuid(buf->dcontext.CreateGuid);
2099         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2100
2101         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2102         buf->Name[0] = 'D';
2103         buf->Name[1] = 'H';
2104         buf->Name[2] = '2';
2105         buf->Name[3] = 'Q';
2106         return buf;
2107 }
2108
2109 static struct create_durable_handle_reconnect_v2 *
2110 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2111 {
2112         struct create_durable_handle_reconnect_v2 *buf;
2113
2114         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2115                         GFP_KERNEL);
2116         if (!buf)
2117                 return NULL;
2118
2119         buf->ccontext.DataOffset =
2120                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2121                                      dcontext));
2122         buf->ccontext.DataLength =
2123                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2124         buf->ccontext.NameOffset =
2125                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2126                             Name));
2127         buf->ccontext.NameLength = cpu_to_le16(4);
2128
2129         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2130         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2131         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2132         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2133
2134         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2135         buf->Name[0] = 'D';
2136         buf->Name[1] = 'H';
2137         buf->Name[2] = '2';
2138         buf->Name[3] = 'C';
2139         return buf;
2140 }
2141
2142 static int
2143 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2144                     struct cifs_open_parms *oparms)
2145 {
2146         struct smb2_create_req *req = iov[0].iov_base;
2147         unsigned int num = *num_iovec;
2148
2149         iov[num].iov_base = create_durable_v2_buf(oparms);
2150         if (iov[num].iov_base == NULL)
2151                 return -ENOMEM;
2152         iov[num].iov_len = sizeof(struct create_durable_v2);
2153         if (!req->CreateContextsOffset)
2154                 req->CreateContextsOffset =
2155                         cpu_to_le32(sizeof(struct smb2_create_req) +
2156                                                                 iov[1].iov_len);
2157         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2158         *num_iovec = num + 1;
2159         return 0;
2160 }
2161
2162 static int
2163 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2164                     struct cifs_open_parms *oparms)
2165 {
2166         struct smb2_create_req *req = iov[0].iov_base;
2167         unsigned int num = *num_iovec;
2168
2169         /* indicate that we don't need to relock the file */
2170         oparms->reconnect = false;
2171
2172         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2173         if (iov[num].iov_base == NULL)
2174                 return -ENOMEM;
2175         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2176         if (!req->CreateContextsOffset)
2177                 req->CreateContextsOffset =
2178                         cpu_to_le32(sizeof(struct smb2_create_req) +
2179                                                                 iov[1].iov_len);
2180         le32_add_cpu(&req->CreateContextsLength,
2181                         sizeof(struct create_durable_handle_reconnect_v2));
2182         *num_iovec = num + 1;
2183         return 0;
2184 }
2185
2186 static int
2187 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2188                     struct cifs_open_parms *oparms, bool use_persistent)
2189 {
2190         struct smb2_create_req *req = iov[0].iov_base;
2191         unsigned int num = *num_iovec;
2192
2193         if (use_persistent) {
2194                 if (oparms->reconnect)
2195                         return add_durable_reconnect_v2_context(iov, num_iovec,
2196                                                                 oparms);
2197                 else
2198                         return add_durable_v2_context(iov, num_iovec, oparms);
2199         }
2200
2201         if (oparms->reconnect) {
2202                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2203                 /* indicate that we don't need to relock the file */
2204                 oparms->reconnect = false;
2205         } else
2206                 iov[num].iov_base = create_durable_buf();
2207         if (iov[num].iov_base == NULL)
2208                 return -ENOMEM;
2209         iov[num].iov_len = sizeof(struct create_durable);
2210         if (!req->CreateContextsOffset)
2211                 req->CreateContextsOffset =
2212                         cpu_to_le32(sizeof(struct smb2_create_req) +
2213                                                                 iov[1].iov_len);
2214         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2215         *num_iovec = num + 1;
2216         return 0;
2217 }
2218
2219 /* See MS-SMB2 2.2.13.2.7 */
2220 static struct crt_twarp_ctxt *
2221 create_twarp_buf(__u64 timewarp)
2222 {
2223         struct crt_twarp_ctxt *buf;
2224
2225         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2226         if (!buf)
2227                 return NULL;
2228
2229         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2230                                         (struct crt_twarp_ctxt, Timestamp));
2231         buf->ccontext.DataLength = cpu_to_le32(8);
2232         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2233                                 (struct crt_twarp_ctxt, Name));
2234         buf->ccontext.NameLength = cpu_to_le16(4);
2235         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2236         buf->Name[0] = 'T';
2237         buf->Name[1] = 'W';
2238         buf->Name[2] = 'r';
2239         buf->Name[3] = 'p';
2240         buf->Timestamp = cpu_to_le64(timewarp);
2241         return buf;
2242 }
2243
2244 /* See MS-SMB2 2.2.13.2.7 */
2245 static int
2246 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2247 {
2248         struct smb2_create_req *req = iov[0].iov_base;
2249         unsigned int num = *num_iovec;
2250
2251         iov[num].iov_base = create_twarp_buf(timewarp);
2252         if (iov[num].iov_base == NULL)
2253                 return -ENOMEM;
2254         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2255         if (!req->CreateContextsOffset)
2256                 req->CreateContextsOffset = cpu_to_le32(
2257                                 sizeof(struct smb2_create_req) +
2258                                 iov[num - 1].iov_len);
2259         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2260         *num_iovec = num + 1;
2261         return 0;
2262 }
2263
2264 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2265 static void setup_owner_group_sids(char *buf)
2266 {
2267         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2268
2269         /* Populate the user ownership fields S-1-5-88-1 */
2270         sids->owner.Revision = 1;
2271         sids->owner.NumAuth = 3;
2272         sids->owner.Authority[5] = 5;
2273         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2274         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2275         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2276
2277         /* Populate the group ownership fields S-1-5-88-2 */
2278         sids->group.Revision = 1;
2279         sids->group.NumAuth = 3;
2280         sids->group.Authority[5] = 5;
2281         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2282         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2283         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2284
2285         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2286 }
2287
2288 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2289 static struct crt_sd_ctxt *
2290 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2291 {
2292         struct crt_sd_ctxt *buf;
2293         __u8 *ptr, *aclptr;
2294         unsigned int acelen, acl_size, ace_count;
2295         unsigned int owner_offset = 0;
2296         unsigned int group_offset = 0;
2297         struct smb3_acl acl = {};
2298
2299         *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2300
2301         if (set_owner) {
2302                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2303                 *len += sizeof(struct owner_group_sids);
2304         }
2305
2306         buf = kzalloc(*len, GFP_KERNEL);
2307         if (buf == NULL)
2308                 return buf;
2309
2310         ptr = (__u8 *)&buf[1];
2311         if (set_owner) {
2312                 /* offset fields are from beginning of security descriptor not of create context */
2313                 owner_offset = ptr - (__u8 *)&buf->sd;
2314                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2315                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2316                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2317
2318                 setup_owner_group_sids(ptr);
2319                 ptr += sizeof(struct owner_group_sids);
2320         } else {
2321                 buf->sd.OffsetOwner = 0;
2322                 buf->sd.OffsetGroup = 0;
2323         }
2324
2325         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2326         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2327         buf->ccontext.NameLength = cpu_to_le16(4);
2328         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2329         buf->Name[0] = 'S';
2330         buf->Name[1] = 'e';
2331         buf->Name[2] = 'c';
2332         buf->Name[3] = 'D';
2333         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2334
2335         /*
2336          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2337          * and "DP" ie the DACL is present
2338          */
2339         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2340
2341         /* offset owner, group and Sbz1 and SACL are all zero */
2342         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2343         /* Ship the ACL for now. we will copy it into buf later. */
2344         aclptr = ptr;
2345         ptr += sizeof(struct smb3_acl);
2346
2347         /* create one ACE to hold the mode embedded in reserved special SID */
2348         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2349         ptr += acelen;
2350         acl_size = acelen + sizeof(struct smb3_acl);
2351         ace_count = 1;
2352
2353         if (set_owner) {
2354                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2355                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2356                 ptr += acelen;
2357                 acl_size += acelen;
2358                 ace_count += 1;
2359         }
2360
2361         /* and one more ACE to allow access for authenticated users */
2362         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2363         ptr += acelen;
2364         acl_size += acelen;
2365         ace_count += 1;
2366
2367         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2368         acl.AclSize = cpu_to_le16(acl_size);
2369         acl.AceCount = cpu_to_le16(ace_count);
2370         /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2371         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2372
2373         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2374         *len = roundup(ptr - (__u8 *)buf, 8);
2375
2376         return buf;
2377 }
2378
2379 static int
2380 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2381 {
2382         struct smb2_create_req *req = iov[0].iov_base;
2383         unsigned int num = *num_iovec;
2384         unsigned int len = 0;
2385
2386         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2387         if (iov[num].iov_base == NULL)
2388                 return -ENOMEM;
2389         iov[num].iov_len = len;
2390         if (!req->CreateContextsOffset)
2391                 req->CreateContextsOffset = cpu_to_le32(
2392                                 sizeof(struct smb2_create_req) +
2393                                 iov[num - 1].iov_len);
2394         le32_add_cpu(&req->CreateContextsLength, len);
2395         *num_iovec = num + 1;
2396         return 0;
2397 }
2398
2399 static struct crt_query_id_ctxt *
2400 create_query_id_buf(void)
2401 {
2402         struct crt_query_id_ctxt *buf;
2403
2404         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2405         if (!buf)
2406                 return NULL;
2407
2408         buf->ccontext.DataOffset = cpu_to_le16(0);
2409         buf->ccontext.DataLength = cpu_to_le32(0);
2410         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2411                                 (struct crt_query_id_ctxt, Name));
2412         buf->ccontext.NameLength = cpu_to_le16(4);
2413         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2414         buf->Name[0] = 'Q';
2415         buf->Name[1] = 'F';
2416         buf->Name[2] = 'i';
2417         buf->Name[3] = 'd';
2418         return buf;
2419 }
2420
2421 /* See MS-SMB2 2.2.13.2.9 */
2422 static int
2423 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2424 {
2425         struct smb2_create_req *req = iov[0].iov_base;
2426         unsigned int num = *num_iovec;
2427
2428         iov[num].iov_base = create_query_id_buf();
2429         if (iov[num].iov_base == NULL)
2430                 return -ENOMEM;
2431         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2432         if (!req->CreateContextsOffset)
2433                 req->CreateContextsOffset = cpu_to_le32(
2434                                 sizeof(struct smb2_create_req) +
2435                                 iov[num - 1].iov_len);
2436         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2437         *num_iovec = num + 1;
2438         return 0;
2439 }
2440
2441 static int
2442 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2443                             const char *treename, const __le16 *path)
2444 {
2445         int treename_len, path_len;
2446         struct nls_table *cp;
2447         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2448
2449         /*
2450          * skip leading "\\"
2451          */
2452         treename_len = strlen(treename);
2453         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2454                 return -EINVAL;
2455
2456         treename += 2;
2457         treename_len -= 2;
2458
2459         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2460
2461         /*
2462          * make room for one path separator between the treename and
2463          * path
2464          */
2465         *out_len = treename_len + 1 + path_len;
2466
2467         /*
2468          * final path needs to be null-terminated UTF16 with a
2469          * size aligned to 8
2470          */
2471
2472         *out_size = roundup((*out_len+1)*2, 8);
2473         *out_path = kzalloc(*out_size, GFP_KERNEL);
2474         if (!*out_path)
2475                 return -ENOMEM;
2476
2477         cp = load_nls_default();
2478         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2479         UniStrcat(*out_path, sep);
2480         UniStrcat(*out_path, path);
2481         unload_nls(cp);
2482
2483         return 0;
2484 }
2485
2486 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2487                                umode_t mode, struct cifs_tcon *tcon,
2488                                const char *full_path,
2489                                struct cifs_sb_info *cifs_sb)
2490 {
2491         struct smb_rqst rqst;
2492         struct smb2_create_req *req;
2493         struct smb2_create_rsp *rsp = NULL;
2494         struct cifs_ses *ses = tcon->ses;
2495         struct kvec iov[3]; /* make sure at least one for each open context */
2496         struct kvec rsp_iov = {NULL, 0};
2497         int resp_buftype;
2498         int uni_path_len;
2499         __le16 *copy_path = NULL;
2500         int copy_size;
2501         int rc = 0;
2502         unsigned int n_iov = 2;
2503         __u32 file_attributes = 0;
2504         char *pc_buf = NULL;
2505         int flags = 0;
2506         unsigned int total_len;
2507         __le16 *utf16_path = NULL;
2508         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2509
2510         cifs_dbg(FYI, "mkdir\n");
2511
2512         /* resource #1: path allocation */
2513         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2514         if (!utf16_path)
2515                 return -ENOMEM;
2516
2517         if (!ses || !server) {
2518                 rc = -EIO;
2519                 goto err_free_path;
2520         }
2521
2522         /* resource #2: request */
2523         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2524                                  (void **) &req, &total_len);
2525         if (rc)
2526                 goto err_free_path;
2527
2528
2529         if (smb3_encryption_required(tcon))
2530                 flags |= CIFS_TRANSFORM_REQ;
2531
2532         req->ImpersonationLevel = IL_IMPERSONATION;
2533         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2534         /* File attributes ignored on open (used in create though) */
2535         req->FileAttributes = cpu_to_le32(file_attributes);
2536         req->ShareAccess = FILE_SHARE_ALL_LE;
2537         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2538         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2539
2540         iov[0].iov_base = (char *)req;
2541         /* -1 since last byte is buf[0] which is sent below (path) */
2542         iov[0].iov_len = total_len - 1;
2543
2544         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2545
2546         /* [MS-SMB2] 2.2.13 NameOffset:
2547          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2548          * the SMB2 header, the file name includes a prefix that will
2549          * be processed during DFS name normalization as specified in
2550          * section 3.3.5.9. Otherwise, the file name is relative to
2551          * the share that is identified by the TreeId in the SMB2
2552          * header.
2553          */
2554         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2555                 int name_len;
2556
2557                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2558                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2559                                                  &name_len,
2560                                                  tcon->treeName, utf16_path);
2561                 if (rc)
2562                         goto err_free_req;
2563
2564                 req->NameLength = cpu_to_le16(name_len * 2);
2565                 uni_path_len = copy_size;
2566                 /* free before overwriting resource */
2567                 kfree(utf16_path);
2568                 utf16_path = copy_path;
2569         } else {
2570                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2571                 /* MUST set path len (NameLength) to 0 opening root of share */
2572                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2573                 if (uni_path_len % 8 != 0) {
2574                         copy_size = roundup(uni_path_len, 8);
2575                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2576                         if (!copy_path) {
2577                                 rc = -ENOMEM;
2578                                 goto err_free_req;
2579                         }
2580                         memcpy((char *)copy_path, (const char *)utf16_path,
2581                                uni_path_len);
2582                         uni_path_len = copy_size;
2583                         /* free before overwriting resource */
2584                         kfree(utf16_path);
2585                         utf16_path = copy_path;
2586                 }
2587         }
2588
2589         iov[1].iov_len = uni_path_len;
2590         iov[1].iov_base = utf16_path;
2591         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2592
2593         if (tcon->posix_extensions) {
2594                 /* resource #3: posix buf */
2595                 rc = add_posix_context(iov, &n_iov, mode);
2596                 if (rc)
2597                         goto err_free_req;
2598                 pc_buf = iov[n_iov-1].iov_base;
2599         }
2600
2601
2602         memset(&rqst, 0, sizeof(struct smb_rqst));
2603         rqst.rq_iov = iov;
2604         rqst.rq_nvec = n_iov;
2605
2606         /* no need to inc num_remote_opens because we close it just below */
2607         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2608                                     FILE_WRITE_ATTRIBUTES);
2609         /* resource #4: response buffer */
2610         rc = cifs_send_recv(xid, ses, server,
2611                             &rqst, &resp_buftype, flags, &rsp_iov);
2612         if (rc) {
2613                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2614                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2615                                            CREATE_NOT_FILE,
2616                                            FILE_WRITE_ATTRIBUTES, rc);
2617                 goto err_free_rsp_buf;
2618         }
2619
2620         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2621         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2622                                     ses->Suid, CREATE_NOT_FILE,
2623                                     FILE_WRITE_ATTRIBUTES);
2624
2625         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2626
2627         /* Eventually save off posix specific response info and timestaps */
2628
2629 err_free_rsp_buf:
2630         free_rsp_buf(resp_buftype, rsp);
2631         kfree(pc_buf);
2632 err_free_req:
2633         cifs_small_buf_release(req);
2634 err_free_path:
2635         kfree(utf16_path);
2636         return rc;
2637 }
2638
2639 int
2640 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2641                struct smb_rqst *rqst, __u8 *oplock,
2642                struct cifs_open_parms *oparms, __le16 *path)
2643 {
2644         struct smb2_create_req *req;
2645         unsigned int n_iov = 2;
2646         __u32 file_attributes = 0;
2647         int copy_size;
2648         int uni_path_len;
2649         unsigned int total_len;
2650         struct kvec *iov = rqst->rq_iov;
2651         __le16 *copy_path;
2652         int rc;
2653
2654         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2655                                  (void **) &req, &total_len);
2656         if (rc)
2657                 return rc;
2658
2659         iov[0].iov_base = (char *)req;
2660         /* -1 since last byte is buf[0] which is sent below (path) */
2661         iov[0].iov_len = total_len - 1;
2662
2663         if (oparms->create_options & CREATE_OPTION_READONLY)
2664                 file_attributes |= ATTR_READONLY;
2665         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2666                 file_attributes |= ATTR_SYSTEM;
2667
2668         req->ImpersonationLevel = IL_IMPERSONATION;
2669         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2670         /* File attributes ignored on open (used in create though) */
2671         req->FileAttributes = cpu_to_le32(file_attributes);
2672         req->ShareAccess = FILE_SHARE_ALL_LE;
2673
2674         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2675         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2676         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2677
2678         /* [MS-SMB2] 2.2.13 NameOffset:
2679          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2680          * the SMB2 header, the file name includes a prefix that will
2681          * be processed during DFS name normalization as specified in
2682          * section 3.3.5.9. Otherwise, the file name is relative to
2683          * the share that is identified by the TreeId in the SMB2
2684          * header.
2685          */
2686         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2687                 int name_len;
2688
2689                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2690                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2691                                                  &name_len,
2692                                                  tcon->treeName, path);
2693                 if (rc)
2694                         return rc;
2695                 req->NameLength = cpu_to_le16(name_len * 2);
2696                 uni_path_len = copy_size;
2697                 path = copy_path;
2698         } else {
2699                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2700                 /* MUST set path len (NameLength) to 0 opening root of share */
2701                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2702                 copy_size = uni_path_len;
2703                 if (copy_size % 8 != 0)
2704                         copy_size = roundup(copy_size, 8);
2705                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2706                 if (!copy_path)
2707                         return -ENOMEM;
2708                 memcpy((char *)copy_path, (const char *)path,
2709                        uni_path_len);
2710                 uni_path_len = copy_size;
2711                 path = copy_path;
2712         }
2713
2714         iov[1].iov_len = uni_path_len;
2715         iov[1].iov_base = path;
2716
2717         if ((!server->oplocks) || (tcon->no_lease))
2718                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2719
2720         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2721             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2722                 req->RequestedOplockLevel = *oplock;
2723         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2724                   (oparms->create_options & CREATE_NOT_FILE))
2725                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2726         else {
2727                 rc = add_lease_context(server, iov, &n_iov,
2728                                        oparms->fid->lease_key, oplock);
2729                 if (rc)
2730                         return rc;
2731         }
2732
2733         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2734                 /* need to set Next field of lease context if we request it */
2735                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2736                         struct create_context *ccontext =
2737                             (struct create_context *)iov[n_iov-1].iov_base;
2738                         ccontext->Next =
2739                                 cpu_to_le32(server->vals->create_lease_size);
2740                 }
2741
2742                 rc = add_durable_context(iov, &n_iov, oparms,
2743                                         tcon->use_persistent);
2744                 if (rc)
2745                         return rc;
2746         }
2747
2748         if (tcon->posix_extensions) {
2749                 if (n_iov > 2) {
2750                         struct create_context *ccontext =
2751                             (struct create_context *)iov[n_iov-1].iov_base;
2752                         ccontext->Next =
2753                                 cpu_to_le32(iov[n_iov-1].iov_len);
2754                 }
2755
2756                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2757                 if (rc)
2758                         return rc;
2759         }
2760
2761         if (tcon->snapshot_time) {
2762                 cifs_dbg(FYI, "adding snapshot context\n");
2763                 if (n_iov > 2) {
2764                         struct create_context *ccontext =
2765                             (struct create_context *)iov[n_iov-1].iov_base;
2766                         ccontext->Next =
2767                                 cpu_to_le32(iov[n_iov-1].iov_len);
2768                 }
2769
2770                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2771                 if (rc)
2772                         return rc;
2773         }
2774
2775         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2776                 bool set_mode;
2777                 bool set_owner;
2778
2779                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2780                     (oparms->mode != ACL_NO_MODE))
2781                         set_mode = true;
2782                 else {
2783                         set_mode = false;
2784                         oparms->mode = ACL_NO_MODE;
2785                 }
2786
2787                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2788                         set_owner = true;
2789                 else
2790                         set_owner = false;
2791
2792                 if (set_owner | set_mode) {
2793                         if (n_iov > 2) {
2794                                 struct create_context *ccontext =
2795                                     (struct create_context *)iov[n_iov-1].iov_base;
2796                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2797                         }
2798
2799                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2800                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2801                         if (rc)
2802                                 return rc;
2803                 }
2804         }
2805
2806         if (n_iov > 2) {
2807                 struct create_context *ccontext =
2808                         (struct create_context *)iov[n_iov-1].iov_base;
2809                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2810         }
2811         add_query_id_context(iov, &n_iov);
2812
2813         rqst->rq_nvec = n_iov;
2814         return 0;
2815 }
2816
2817 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2818  * All other vectors are freed by kfree().
2819  */
2820 void
2821 SMB2_open_free(struct smb_rqst *rqst)
2822 {
2823         int i;
2824
2825         if (rqst && rqst->rq_iov) {
2826                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2827                 for (i = 1; i < rqst->rq_nvec; i++)
2828                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2829                                 kfree(rqst->rq_iov[i].iov_base);
2830         }
2831 }
2832
2833 int
2834 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2835           __u8 *oplock, struct smb2_file_all_info *buf,
2836           struct create_posix_rsp *posix,
2837           struct kvec *err_iov, int *buftype)
2838 {
2839         struct smb_rqst rqst;
2840         struct smb2_create_rsp *rsp = NULL;
2841         struct cifs_tcon *tcon = oparms->tcon;
2842         struct cifs_ses *ses = tcon->ses;
2843         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2844         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2845         struct kvec rsp_iov = {NULL, 0};
2846         int resp_buftype = CIFS_NO_BUFFER;
2847         int rc = 0;
2848         int flags = 0;
2849
2850         cifs_dbg(FYI, "create/open\n");
2851         if (!ses || !server)
2852                 return -EIO;
2853
2854         if (smb3_encryption_required(tcon))
2855                 flags |= CIFS_TRANSFORM_REQ;
2856
2857         memset(&rqst, 0, sizeof(struct smb_rqst));
2858         memset(&iov, 0, sizeof(iov));
2859         rqst.rq_iov = iov;
2860         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2861
2862         rc = SMB2_open_init(tcon, server,
2863                             &rqst, oplock, oparms, path);
2864         if (rc)
2865                 goto creat_exit;
2866
2867         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2868                 oparms->create_options, oparms->desired_access);
2869
2870         rc = cifs_send_recv(xid, ses, server,
2871                             &rqst, &resp_buftype, flags,
2872                             &rsp_iov);
2873         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2874
2875         if (rc != 0) {
2876                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2877                 if (err_iov && rsp) {
2878                         *err_iov = rsp_iov;
2879                         *buftype = resp_buftype;
2880                         resp_buftype = CIFS_NO_BUFFER;
2881                         rsp = NULL;
2882                 }
2883                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2884                                     oparms->create_options, oparms->desired_access, rc);
2885                 if (rc == -EREMCHG) {
2886                         pr_warn_once("server share %s deleted\n",
2887                                      tcon->treeName);
2888                         tcon->need_reconnect = true;
2889                 }
2890                 goto creat_exit;
2891         } else
2892                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2893                                      ses->Suid, oparms->create_options,
2894                                      oparms->desired_access);
2895
2896         atomic_inc(&tcon->num_remote_opens);
2897         oparms->fid->persistent_fid = rsp->PersistentFileId;
2898         oparms->fid->volatile_fid = rsp->VolatileFileId;
2899         oparms->fid->access = oparms->desired_access;
2900 #ifdef CONFIG_CIFS_DEBUG2
2901         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2902 #endif /* CIFS_DEBUG2 */
2903
2904         if (buf) {
2905                 memcpy(buf, &rsp->CreationTime, 32);
2906                 buf->AllocationSize = rsp->AllocationSize;
2907                 buf->EndOfFile = rsp->EndofFile;
2908                 buf->Attributes = rsp->FileAttributes;
2909                 buf->NumberOfLinks = cpu_to_le32(1);
2910                 buf->DeletePending = 0;
2911         }
2912
2913
2914         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2915                             oparms->fid->lease_key, oplock, buf, posix);
2916 creat_exit:
2917         SMB2_open_free(&rqst);
2918         free_rsp_buf(resp_buftype, rsp);
2919         return rc;
2920 }
2921
2922 int
2923 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2924                 struct smb_rqst *rqst,
2925                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2926                 char *in_data, u32 indatalen,
2927                 __u32 max_response_size)
2928 {
2929         struct smb2_ioctl_req *req;
2930         struct kvec *iov = rqst->rq_iov;
2931         unsigned int total_len;
2932         int rc;
2933         char *in_data_buf;
2934
2935         rc = smb2_ioctl_req_init(opcode, tcon, server,
2936                                  (void **) &req, &total_len);
2937         if (rc)
2938                 return rc;
2939
2940         if (indatalen) {
2941                 /*
2942                  * indatalen is usually small at a couple of bytes max, so
2943                  * just allocate through generic pool
2944                  */
2945                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2946                 if (!in_data_buf) {
2947                         cifs_small_buf_release(req);
2948                         return -ENOMEM;
2949                 }
2950         }
2951
2952         req->CtlCode = cpu_to_le32(opcode);
2953         req->PersistentFileId = persistent_fid;
2954         req->VolatileFileId = volatile_fid;
2955
2956         iov[0].iov_base = (char *)req;
2957         /*
2958          * If no input data, the size of ioctl struct in
2959          * protocol spec still includes a 1 byte data buffer,
2960          * but if input data passed to ioctl, we do not
2961          * want to double count this, so we do not send
2962          * the dummy one byte of data in iovec[0] if sending
2963          * input data (in iovec[1]).
2964          */
2965         if (indatalen) {
2966                 req->InputCount = cpu_to_le32(indatalen);
2967                 /* do not set InputOffset if no input data */
2968                 req->InputOffset =
2969                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2970                 rqst->rq_nvec = 2;
2971                 iov[0].iov_len = total_len - 1;
2972                 iov[1].iov_base = in_data_buf;
2973                 iov[1].iov_len = indatalen;
2974         } else {
2975                 rqst->rq_nvec = 1;
2976                 iov[0].iov_len = total_len;
2977         }
2978
2979         req->OutputOffset = 0;
2980         req->OutputCount = 0; /* MBZ */
2981
2982         /*
2983          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2984          * We Could increase default MaxOutputResponse, but that could require
2985          * more credits. Windows typically sets this smaller, but for some
2986          * ioctls it may be useful to allow server to send more. No point
2987          * limiting what the server can send as long as fits in one credit
2988          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2989          * to increase this limit up in the future.
2990          * Note that for snapshot queries that servers like Azure expect that
2991          * the first query be minimal size (and just used to get the number/size
2992          * of previous versions) so response size must be specified as EXACTLY
2993          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2994          * of eight bytes.  Currently that is the only case where we set max
2995          * response size smaller.
2996          */
2997         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2998         req->sync_hdr.CreditCharge =
2999                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3000                                          SMB2_MAX_BUFFER_SIZE));
3001         /* always an FSCTL (for now) */
3002         req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3003
3004         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3005         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3006                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
3007
3008         return 0;
3009 }
3010
3011 void
3012 SMB2_ioctl_free(struct smb_rqst *rqst)
3013 {
3014         int i;
3015         if (rqst && rqst->rq_iov) {
3016                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3017                 for (i = 1; i < rqst->rq_nvec; i++)
3018                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3019                                 kfree(rqst->rq_iov[i].iov_base);
3020         }
3021 }
3022
3023
3024 /*
3025  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3026  */
3027 int
3028 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3029            u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3030            u32 max_out_data_len, char **out_data,
3031            u32 *plen /* returned data len */)
3032 {
3033         struct smb_rqst rqst;
3034         struct smb2_ioctl_rsp *rsp = NULL;
3035         struct cifs_ses *ses;
3036         struct TCP_Server_Info *server;
3037         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3038         struct kvec rsp_iov = {NULL, 0};
3039         int resp_buftype = CIFS_NO_BUFFER;
3040         int rc = 0;
3041         int flags = 0;
3042
3043         cifs_dbg(FYI, "SMB2 IOCTL\n");
3044
3045         if (out_data != NULL)
3046                 *out_data = NULL;
3047
3048         /* zero out returned data len, in case of error */
3049         if (plen)
3050                 *plen = 0;
3051
3052         if (!tcon)
3053                 return -EIO;
3054
3055         ses = tcon->ses;
3056         if (!ses)
3057                 return -EIO;
3058
3059         server = cifs_pick_channel(ses);
3060         if (!server)
3061                 return -EIO;
3062
3063         if (smb3_encryption_required(tcon))
3064                 flags |= CIFS_TRANSFORM_REQ;
3065
3066         memset(&rqst, 0, sizeof(struct smb_rqst));
3067         memset(&iov, 0, sizeof(iov));
3068         rqst.rq_iov = iov;
3069         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3070
3071         rc = SMB2_ioctl_init(tcon, server,
3072                              &rqst, persistent_fid, volatile_fid, opcode,
3073                              in_data, indatalen, max_out_data_len);
3074         if (rc)
3075                 goto ioctl_exit;
3076
3077         rc = cifs_send_recv(xid, ses, server,
3078                             &rqst, &resp_buftype, flags,
3079                             &rsp_iov);
3080         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3081
3082         if (rc != 0)
3083                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3084                                 ses->Suid, 0, opcode, rc);
3085
3086         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3087                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3088                 goto ioctl_exit;
3089         } else if (rc == -EINVAL) {
3090                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3091                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3092                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3093                         goto ioctl_exit;
3094                 }
3095         } else if (rc == -E2BIG) {
3096                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3097                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3098                         goto ioctl_exit;
3099                 }
3100         }
3101
3102         /* check if caller wants to look at return data or just return rc */
3103         if ((plen == NULL) || (out_data == NULL))
3104                 goto ioctl_exit;
3105
3106         *plen = le32_to_cpu(rsp->OutputCount);
3107
3108         /* We check for obvious errors in the output buffer length and offset */
3109         if (*plen == 0)
3110                 goto ioctl_exit; /* server returned no data */
3111         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3112                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3113                 *plen = 0;
3114                 rc = -EIO;
3115                 goto ioctl_exit;
3116         }
3117
3118         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3119                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3120                         le32_to_cpu(rsp->OutputOffset));
3121                 *plen = 0;
3122                 rc = -EIO;
3123                 goto ioctl_exit;
3124         }
3125
3126         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3127                             *plen, GFP_KERNEL);
3128         if (*out_data == NULL) {
3129                 rc = -ENOMEM;
3130                 goto ioctl_exit;
3131         }
3132
3133 ioctl_exit:
3134         SMB2_ioctl_free(&rqst);
3135         free_rsp_buf(resp_buftype, rsp);
3136         return rc;
3137 }
3138
3139 /*
3140  *   Individual callers to ioctl worker function follow
3141  */
3142
3143 int
3144 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3145                      u64 persistent_fid, u64 volatile_fid)
3146 {
3147         int rc;
3148         struct  compress_ioctl fsctl_input;
3149         char *ret_data = NULL;
3150
3151         fsctl_input.CompressionState =
3152                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3153
3154         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3155                         FSCTL_SET_COMPRESSION,
3156                         (char *)&fsctl_input /* data input */,
3157                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3158                         &ret_data /* out data */, NULL);
3159
3160         cifs_dbg(FYI, "set compression rc %d\n", rc);
3161
3162         return rc;
3163 }
3164
3165 int
3166 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3167                 struct smb_rqst *rqst,
3168                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3169 {
3170         struct smb2_close_req *req;
3171         struct kvec *iov = rqst->rq_iov;
3172         unsigned int total_len;
3173         int rc;
3174
3175         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3176                                  (void **) &req, &total_len);
3177         if (rc)
3178                 return rc;
3179
3180         req->PersistentFileId = persistent_fid;
3181         req->VolatileFileId = volatile_fid;
3182         if (query_attrs)
3183                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3184         else
3185                 req->Flags = 0;
3186         iov[0].iov_base = (char *)req;
3187         iov[0].iov_len = total_len;
3188
3189         return 0;
3190 }
3191
3192 void
3193 SMB2_close_free(struct smb_rqst *rqst)
3194 {
3195         if (rqst && rqst->rq_iov)
3196                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3197 }
3198
3199 int
3200 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3201              u64 persistent_fid, u64 volatile_fid,
3202              struct smb2_file_network_open_info *pbuf)
3203 {
3204         struct smb_rqst rqst;
3205         struct smb2_close_rsp *rsp = NULL;
3206         struct cifs_ses *ses = tcon->ses;
3207         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3208         struct kvec iov[1];
3209         struct kvec rsp_iov;
3210         int resp_buftype = CIFS_NO_BUFFER;
3211         int rc = 0;
3212         int flags = 0;
3213         bool query_attrs = false;
3214
3215         cifs_dbg(FYI, "Close\n");
3216
3217         if (!ses || !server)
3218                 return -EIO;
3219
3220         if (smb3_encryption_required(tcon))
3221                 flags |= CIFS_TRANSFORM_REQ;
3222
3223         memset(&rqst, 0, sizeof(struct smb_rqst));
3224         memset(&iov, 0, sizeof(iov));
3225         rqst.rq_iov = iov;
3226         rqst.rq_nvec = 1;
3227
3228         /* check if need to ask server to return timestamps in close response */
3229         if (pbuf)
3230                 query_attrs = true;
3231
3232         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3233         rc = SMB2_close_init(tcon, server,
3234                              &rqst, persistent_fid, volatile_fid,
3235                              query_attrs);
3236         if (rc)
3237                 goto close_exit;
3238
3239         rc = cifs_send_recv(xid, ses, server,
3240                             &rqst, &resp_buftype, flags, &rsp_iov);
3241         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3242
3243         if (rc != 0) {
3244                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3245                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3246                                      rc);
3247                 goto close_exit;
3248         } else {
3249                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3250                                       ses->Suid);
3251                 /*
3252                  * Note that have to subtract 4 since struct network_open_info
3253                  * has a final 4 byte pad that close response does not have
3254                  */
3255                 if (pbuf)
3256                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3257         }
3258
3259         atomic_dec(&tcon->num_remote_opens);
3260 close_exit:
3261         SMB2_close_free(&rqst);
3262         free_rsp_buf(resp_buftype, rsp);
3263
3264         /* retry close in a worker thread if this one is interrupted */
3265         if (is_interrupt_error(rc)) {
3266                 int tmp_rc;
3267
3268                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3269                                                      volatile_fid);
3270                 if (tmp_rc)
3271                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3272                                  persistent_fid, tmp_rc);
3273         }
3274         return rc;
3275 }
3276
3277 int
3278 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3279                 u64 persistent_fid, u64 volatile_fid)
3280 {
3281         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3282 }
3283
3284 int
3285 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3286                   struct kvec *iov, unsigned int min_buf_size)
3287 {
3288         unsigned int smb_len = iov->iov_len;
3289         char *end_of_smb = smb_len + (char *)iov->iov_base;
3290         char *begin_of_buf = offset + (char *)iov->iov_base;
3291         char *end_of_buf = begin_of_buf + buffer_length;
3292
3293
3294         if (buffer_length < min_buf_size) {
3295                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3296                          buffer_length, min_buf_size);
3297                 return -EINVAL;
3298         }
3299
3300         /* check if beyond RFC1001 maximum length */
3301         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3302                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3303                          buffer_length, smb_len);
3304                 return -EINVAL;
3305         }
3306
3307         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3308                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3309                 return -EINVAL;
3310         }
3311
3312         return 0;
3313 }
3314
3315 /*
3316  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3317  * Caller must free buffer.
3318  */
3319 int
3320 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3321                            struct kvec *iov, unsigned int minbufsize,
3322                            char *data)
3323 {
3324         char *begin_of_buf = offset + (char *)iov->iov_base;
3325         int rc;
3326
3327         if (!data)
3328                 return -EINVAL;
3329
3330         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3331         if (rc)
3332                 return rc;
3333
3334         memcpy(data, begin_of_buf, buffer_length);
3335
3336         return 0;
3337 }
3338
3339 int
3340 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3341                      struct smb_rqst *rqst,
3342                      u64 persistent_fid, u64 volatile_fid,
3343                      u8 info_class, u8 info_type, u32 additional_info,
3344                      size_t output_len, size_t input_len, void *input)
3345 {
3346         struct smb2_query_info_req *req;
3347         struct kvec *iov = rqst->rq_iov;
3348         unsigned int total_len;
3349         int rc;
3350
3351         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3352                                  (void **) &req, &total_len);
3353         if (rc)
3354                 return rc;
3355
3356         req->InfoType = info_type;
3357         req->FileInfoClass = info_class;
3358         req->PersistentFileId = persistent_fid;
3359         req->VolatileFileId = volatile_fid;
3360         req->AdditionalInformation = cpu_to_le32(additional_info);
3361
3362         req->OutputBufferLength = cpu_to_le32(output_len);
3363         if (input_len) {
3364                 req->InputBufferLength = cpu_to_le32(input_len);
3365                 /* total_len for smb query request never close to le16 max */
3366                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3367                 memcpy(req->Buffer, input, input_len);
3368         }
3369
3370         iov[0].iov_base = (char *)req;
3371         /* 1 for Buffer */
3372         iov[0].iov_len = total_len - 1 + input_len;
3373         return 0;
3374 }
3375
3376 void
3377 SMB2_query_info_free(struct smb_rqst *rqst)
3378 {
3379         if (rqst && rqst->rq_iov)
3380                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3381 }
3382
3383 static int
3384 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3385            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3386            u32 additional_info, size_t output_len, size_t min_len, void **data,
3387                 u32 *dlen)
3388 {
3389         struct smb_rqst rqst;
3390         struct smb2_query_info_rsp *rsp = NULL;
3391         struct kvec iov[1];
3392         struct kvec rsp_iov;
3393         int rc = 0;
3394         int resp_buftype = CIFS_NO_BUFFER;
3395         struct cifs_ses *ses = tcon->ses;
3396         struct TCP_Server_Info *server;
3397         int flags = 0;
3398         bool allocated = false;
3399
3400         cifs_dbg(FYI, "Query Info\n");
3401
3402         if (!ses)
3403                 return -EIO;
3404         server = cifs_pick_channel(ses);
3405         if (!server)
3406                 return -EIO;
3407
3408         if (smb3_encryption_required(tcon))
3409                 flags |= CIFS_TRANSFORM_REQ;
3410
3411         memset(&rqst, 0, sizeof(struct smb_rqst));
3412         memset(&iov, 0, sizeof(iov));
3413         rqst.rq_iov = iov;
3414         rqst.rq_nvec = 1;
3415
3416         rc = SMB2_query_info_init(tcon, server,
3417                                   &rqst, persistent_fid, volatile_fid,
3418                                   info_class, info_type, additional_info,
3419                                   output_len, 0, NULL);
3420         if (rc)
3421                 goto qinf_exit;
3422
3423         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3424                                     ses->Suid, info_class, (__u32)info_type);
3425
3426         rc = cifs_send_recv(xid, ses, server,
3427                             &rqst, &resp_buftype, flags, &rsp_iov);
3428         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3429
3430         if (rc) {
3431                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3432                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3433                                 ses->Suid, info_class, (__u32)info_type, rc);
3434                 goto qinf_exit;
3435         }
3436
3437         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3438                                 ses->Suid, info_class, (__u32)info_type);
3439
3440         if (dlen) {
3441                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3442                 if (!*data) {
3443                         *data = kmalloc(*dlen, GFP_KERNEL);
3444                         if (!*data) {
3445                                 cifs_tcon_dbg(VFS,
3446                                         "Error %d allocating memory for acl\n",
3447                                         rc);
3448                                 *dlen = 0;
3449                                 rc = -ENOMEM;
3450                                 goto qinf_exit;
3451                         }
3452                         allocated = true;
3453                 }
3454         }
3455
3456         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3457                                         le32_to_cpu(rsp->OutputBufferLength),
3458                                         &rsp_iov, min_len, *data);
3459         if (rc && allocated) {
3460                 kfree(*data);
3461                 *data = NULL;
3462                 *dlen = 0;
3463         }
3464
3465 qinf_exit:
3466         SMB2_query_info_free(&rqst);
3467         free_rsp_buf(resp_buftype, rsp);
3468         return rc;
3469 }
3470
3471 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3472         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3473 {
3474         return query_info(xid, tcon, persistent_fid, volatile_fid,
3475                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3476                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3477                           sizeof(struct smb2_file_all_info), (void **)&data,
3478                           NULL);
3479 }
3480
3481 int
3482 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3483                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3484 {
3485         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3486                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3487         *plen = 0;
3488
3489         return query_info(xid, tcon, persistent_fid, volatile_fid,
3490                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3491                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3492 }
3493
3494 int
3495 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3496                 u64 persistent_fid, u64 volatile_fid,
3497                 void **data, u32 *plen)
3498 {
3499         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3500         *plen = 0;
3501
3502         return query_info(xid, tcon, persistent_fid, volatile_fid,
3503                           0, SMB2_O_INFO_SECURITY, additional_info,
3504                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3505 }
3506
3507 int
3508 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3509                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3510 {
3511         return query_info(xid, tcon, persistent_fid, volatile_fid,
3512                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3513                           sizeof(struct smb2_file_internal_info),
3514                           sizeof(struct smb2_file_internal_info),
3515                           (void **)&uniqueid, NULL);
3516 }
3517
3518 /*
3519  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3520  * See MS-SMB2 2.2.35 and 2.2.36
3521  */
3522
3523 static int
3524 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3525                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3526                  u64 persistent_fid, u64 volatile_fid,
3527                  u32 completion_filter, bool watch_tree)
3528 {
3529         struct smb2_change_notify_req *req;
3530         struct kvec *iov = rqst->rq_iov;
3531         unsigned int total_len;
3532         int rc;
3533
3534         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3535                                  (void **) &req, &total_len);
3536         if (rc)
3537                 return rc;
3538
3539         req->PersistentFileId = persistent_fid;
3540         req->VolatileFileId = volatile_fid;
3541         /* See note 354 of MS-SMB2, 64K max */
3542         req->OutputBufferLength =
3543                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3544         req->CompletionFilter = cpu_to_le32(completion_filter);
3545         if (watch_tree)
3546                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3547         else
3548                 req->Flags = 0;
3549
3550         iov[0].iov_base = (char *)req;
3551         iov[0].iov_len = total_len;
3552
3553         return 0;
3554 }
3555
3556 int
3557 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3558                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3559                 u32 completion_filter)
3560 {
3561         struct cifs_ses *ses = tcon->ses;
3562         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3563         struct smb_rqst rqst;
3564         struct kvec iov[1];
3565         struct kvec rsp_iov = {NULL, 0};
3566         int resp_buftype = CIFS_NO_BUFFER;
3567         int flags = 0;
3568         int rc = 0;
3569
3570         cifs_dbg(FYI, "change notify\n");
3571         if (!ses || !server)
3572                 return -EIO;
3573
3574         if (smb3_encryption_required(tcon))
3575                 flags |= CIFS_TRANSFORM_REQ;
3576
3577         memset(&rqst, 0, sizeof(struct smb_rqst));
3578         memset(&iov, 0, sizeof(iov));
3579         rqst.rq_iov = iov;
3580         rqst.rq_nvec = 1;
3581
3582         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3583                               persistent_fid, volatile_fid,
3584                               completion_filter, watch_tree);
3585         if (rc)
3586                 goto cnotify_exit;
3587
3588         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3589                                 (u8)watch_tree, completion_filter);
3590         rc = cifs_send_recv(xid, ses, server,
3591                             &rqst, &resp_buftype, flags, &rsp_iov);
3592
3593         if (rc != 0) {
3594                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3595                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3596                                 (u8)watch_tree, completion_filter, rc);
3597         } else
3598                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3599                                 ses->Suid, (u8)watch_tree, completion_filter);
3600
3601  cnotify_exit:
3602         if (rqst.rq_iov)
3603                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3604         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3605         return rc;
3606 }
3607
3608
3609
3610 /*
3611  * This is a no-op for now. We're not really interested in the reply, but
3612  * rather in the fact that the server sent one and that server->lstrp
3613  * gets updated.
3614  *
3615  * FIXME: maybe we should consider checking that the reply matches request?
3616  */
3617 static void
3618 smb2_echo_callback(struct mid_q_entry *mid)
3619 {
3620         struct TCP_Server_Info *server = mid->callback_data;
3621         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3622         struct cifs_credits credits = { .value = 0, .instance = 0 };
3623
3624         if (mid->mid_state == MID_RESPONSE_RECEIVED
3625             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3626                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3627                 credits.instance = server->reconnect_instance;
3628         }
3629
3630         DeleteMidQEntry(mid);
3631         add_credits(server, &credits, CIFS_ECHO_OP);
3632 }
3633
3634 void smb2_reconnect_server(struct work_struct *work)
3635 {
3636         struct TCP_Server_Info *server = container_of(work,
3637                                         struct TCP_Server_Info, reconnect.work);
3638         struct cifs_ses *ses;
3639         struct cifs_tcon *tcon, *tcon2;
3640         struct list_head tmp_list;
3641         int tcon_exist = false;
3642         int rc;
3643         int resched = false;
3644
3645
3646         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3647         mutex_lock(&server->reconnect_mutex);
3648
3649         INIT_LIST_HEAD(&tmp_list);
3650         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3651
3652         spin_lock(&cifs_tcp_ses_lock);
3653         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3654                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3655                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3656                                 tcon->tc_count++;
3657                                 list_add_tail(&tcon->rlist, &tmp_list);
3658                                 tcon_exist = true;
3659                         }
3660                 }
3661                 /*
3662                  * IPC has the same lifetime as its session and uses its
3663                  * refcount.
3664                  */
3665                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3666                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3667                         tcon_exist = true;
3668                         ses->ses_count++;
3669                 }
3670         }
3671         /*
3672          * Get the reference to server struct to be sure that the last call of
3673          * cifs_put_tcon() in the loop below won't release the server pointer.
3674          */
3675         if (tcon_exist)
3676                 server->srv_count++;
3677
3678         spin_unlock(&cifs_tcp_ses_lock);
3679
3680         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3681                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3682                 if (!rc)
3683                         cifs_reopen_persistent_handles(tcon);
3684                 else
3685                         resched = true;
3686                 list_del_init(&tcon->rlist);
3687                 if (tcon->ipc)
3688                         cifs_put_smb_ses(tcon->ses);
3689                 else
3690                         cifs_put_tcon(tcon);
3691         }
3692
3693         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3694         if (resched)
3695                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3696         mutex_unlock(&server->reconnect_mutex);
3697
3698         /* now we can safely release srv struct */
3699         if (tcon_exist)
3700                 cifs_put_tcp_session(server, 1);
3701 }
3702
3703 int
3704 SMB2_echo(struct TCP_Server_Info *server)
3705 {
3706         struct smb2_echo_req *req;
3707         int rc = 0;
3708         struct kvec iov[1];
3709         struct smb_rqst rqst = { .rq_iov = iov,
3710                                  .rq_nvec = 1 };
3711         unsigned int total_len;
3712
3713         cifs_dbg(FYI, "In echo request\n");
3714
3715         if (server->tcpStatus == CifsNeedNegotiate) {
3716                 /* No need to send echo on newly established connections */
3717                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3718                 return rc;
3719         }
3720
3721         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3722                                  (void **)&req, &total_len);
3723         if (rc)
3724                 return rc;
3725
3726         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3727
3728         iov[0].iov_len = total_len;
3729         iov[0].iov_base = (char *)req;
3730
3731         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3732                              server, CIFS_ECHO_OP, NULL);
3733         if (rc)
3734                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3735
3736         cifs_small_buf_release(req);
3737         return rc;
3738 }
3739
3740 void
3741 SMB2_flush_free(struct smb_rqst *rqst)
3742 {
3743         if (rqst && rqst->rq_iov)
3744                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3745 }
3746
3747 int
3748 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3749                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3750                 u64 persistent_fid, u64 volatile_fid)
3751 {
3752         struct smb2_flush_req *req;
3753         struct kvec *iov = rqst->rq_iov;
3754         unsigned int total_len;
3755         int rc;
3756
3757         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3758                                  (void **) &req, &total_len);
3759         if (rc)
3760                 return rc;
3761
3762         req->PersistentFileId = persistent_fid;
3763         req->VolatileFileId = volatile_fid;
3764
3765         iov[0].iov_base = (char *)req;
3766         iov[0].iov_len = total_len;
3767
3768         return 0;
3769 }
3770
3771 int
3772 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3773            u64 volatile_fid)
3774 {
3775         struct cifs_ses *ses = tcon->ses;
3776         struct smb_rqst rqst;
3777         struct kvec iov[1];
3778         struct kvec rsp_iov = {NULL, 0};
3779         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3780         int resp_buftype = CIFS_NO_BUFFER;
3781         int flags = 0;
3782         int rc = 0;
3783
3784         cifs_dbg(FYI, "flush\n");
3785         if (!ses || !(ses->server))
3786                 return -EIO;
3787
3788         if (smb3_encryption_required(tcon))
3789                 flags |= CIFS_TRANSFORM_REQ;
3790
3791         memset(&rqst, 0, sizeof(struct smb_rqst));
3792         memset(&iov, 0, sizeof(iov));
3793         rqst.rq_iov = iov;
3794         rqst.rq_nvec = 1;
3795
3796         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3797                              persistent_fid, volatile_fid);
3798         if (rc)
3799                 goto flush_exit;
3800
3801         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3802         rc = cifs_send_recv(xid, ses, server,
3803                             &rqst, &resp_buftype, flags, &rsp_iov);
3804
3805         if (rc != 0) {
3806                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3807                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3808                                      rc);
3809         } else
3810                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3811                                       ses->Suid);
3812
3813  flush_exit:
3814         SMB2_flush_free(&rqst);
3815         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3816         return rc;
3817 }
3818
3819 /*
3820  * To form a chain of read requests, any read requests after the first should
3821  * have the end_of_chain boolean set to true.
3822  */
3823 static int
3824 smb2_new_read_req(void **buf, unsigned int *total_len,
3825         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3826         unsigned int remaining_bytes, int request_type)
3827 {
3828         int rc = -EACCES;
3829         struct smb2_read_plain_req *req = NULL;
3830         struct smb2_sync_hdr *shdr;
3831         struct TCP_Server_Info *server = io_parms->server;
3832
3833         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3834                                  (void **) &req, total_len);
3835         if (rc)
3836                 return rc;
3837
3838         if (server == NULL)
3839                 return -ECONNABORTED;
3840
3841         shdr = &req->sync_hdr;
3842         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3843
3844         req->PersistentFileId = io_parms->persistent_fid;
3845         req->VolatileFileId = io_parms->volatile_fid;
3846         req->ReadChannelInfoOffset = 0; /* reserved */
3847         req->ReadChannelInfoLength = 0; /* reserved */
3848         req->Channel = 0; /* reserved */
3849         req->MinimumCount = 0;
3850         req->Length = cpu_to_le32(io_parms->length);
3851         req->Offset = cpu_to_le64(io_parms->offset);
3852
3853         trace_smb3_read_enter(0 /* xid */,
3854                         io_parms->persistent_fid,
3855                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3856                         io_parms->offset, io_parms->length);
3857 #ifdef CONFIG_CIFS_SMB_DIRECT
3858         /*
3859          * If we want to do a RDMA write, fill in and append
3860          * smbd_buffer_descriptor_v1 to the end of read request
3861          */
3862         if (server->rdma && rdata && !server->sign &&
3863                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3864
3865                 struct smbd_buffer_descriptor_v1 *v1;
3866                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3867
3868                 rdata->mr = smbd_register_mr(
3869                                 server->smbd_conn, rdata->pages,
3870                                 rdata->nr_pages, rdata->page_offset,
3871                                 rdata->tailsz, true, need_invalidate);
3872                 if (!rdata->mr)
3873                         return -EAGAIN;
3874
3875                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3876                 if (need_invalidate)
3877                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3878                 req->ReadChannelInfoOffset =
3879                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3880                 req->ReadChannelInfoLength =
3881                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3882                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3883                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3884                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3885                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3886
3887                 *total_len += sizeof(*v1) - 1;
3888         }
3889 #endif
3890         if (request_type & CHAINED_REQUEST) {
3891                 if (!(request_type & END_OF_CHAIN)) {
3892                         /* next 8-byte aligned request */
3893                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3894                         shdr->NextCommand = cpu_to_le32(*total_len);
3895                 } else /* END_OF_CHAIN */
3896                         shdr->NextCommand = 0;
3897                 if (request_type & RELATED_REQUEST) {
3898                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3899                         /*
3900                          * Related requests use info from previous read request
3901                          * in chain.
3902                          */
3903                         shdr->SessionId = 0xFFFFFFFFFFFFFFFF;
3904                         shdr->TreeId = 0xFFFFFFFF;
3905                         req->PersistentFileId = 0xFFFFFFFFFFFFFFFF;
3906                         req->VolatileFileId = 0xFFFFFFFFFFFFFFFF;
3907                 }
3908         }
3909         if (remaining_bytes > io_parms->length)
3910                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3911         else
3912                 req->RemainingBytes = 0;
3913
3914         *buf = req;
3915         return rc;
3916 }
3917
3918 static void
3919 smb2_readv_callback(struct mid_q_entry *mid)
3920 {
3921         struct cifs_readdata *rdata = mid->callback_data;
3922         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3923         struct TCP_Server_Info *server = rdata->server;
3924         struct smb2_sync_hdr *shdr =
3925                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3926         struct cifs_credits credits = { .value = 0, .instance = 0 };
3927         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3928                                  .rq_nvec = 1,
3929                                  .rq_pages = rdata->pages,
3930                                  .rq_offset = rdata->page_offset,
3931                                  .rq_npages = rdata->nr_pages,
3932                                  .rq_pagesz = rdata->pagesz,
3933                                  .rq_tailsz = rdata->tailsz };
3934
3935         WARN_ONCE(rdata->server != mid->server,
3936                   "rdata server %p != mid server %p",
3937                   rdata->server, mid->server);
3938
3939         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3940                  __func__, mid->mid, mid->mid_state, rdata->result,
3941                  rdata->bytes);
3942
3943         switch (mid->mid_state) {
3944         case MID_RESPONSE_RECEIVED:
3945                 credits.value = le16_to_cpu(shdr->CreditRequest);
3946                 credits.instance = server->reconnect_instance;
3947                 /* result already set, check signature */
3948                 if (server->sign && !mid->decrypted) {
3949                         int rc;
3950
3951                         rc = smb2_verify_signature(&rqst, server);
3952                         if (rc)
3953                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3954                                          rc);
3955                 }
3956                 /* FIXME: should this be counted toward the initiating task? */
3957                 task_io_account_read(rdata->got_bytes);
3958                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3959                 break;
3960         case MID_REQUEST_SUBMITTED:
3961         case MID_RETRY_NEEDED:
3962                 rdata->result = -EAGAIN;
3963                 if (server->sign && rdata->got_bytes)
3964                         /* reset bytes number since we can not check a sign */
3965                         rdata->got_bytes = 0;
3966                 /* FIXME: should this be counted toward the initiating task? */
3967                 task_io_account_read(rdata->got_bytes);
3968                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3969                 break;
3970         case MID_RESPONSE_MALFORMED:
3971                 credits.value = le16_to_cpu(shdr->CreditRequest);
3972                 credits.instance = server->reconnect_instance;
3973                 fallthrough;
3974         default:
3975                 rdata->result = -EIO;
3976         }
3977 #ifdef CONFIG_CIFS_SMB_DIRECT
3978         /*
3979          * If this rdata has a memmory registered, the MR can be freed
3980          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3981          * because they have limited number and are used for future I/Os
3982          */
3983         if (rdata->mr) {
3984                 smbd_deregister_mr(rdata->mr);
3985                 rdata->mr = NULL;
3986         }
3987 #endif
3988         if (rdata->result && rdata->result != -ENODATA) {
3989                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3990                 trace_smb3_read_err(0 /* xid */,
3991                                     rdata->cfile->fid.persistent_fid,
3992                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3993                                     rdata->bytes, rdata->result);
3994         } else
3995                 trace_smb3_read_done(0 /* xid */,
3996                                      rdata->cfile->fid.persistent_fid,
3997                                      tcon->tid, tcon->ses->Suid,
3998                                      rdata->offset, rdata->got_bytes);
3999
4000         queue_work(cifsiod_wq, &rdata->work);
4001         DeleteMidQEntry(mid);
4002         add_credits(server, &credits, 0);
4003 }
4004
4005 /* smb2_async_readv - send an async read, and set up mid to handle result */
4006 int
4007 smb2_async_readv(struct cifs_readdata *rdata)
4008 {
4009         int rc, flags = 0;
4010         char *buf;
4011         struct smb2_sync_hdr *shdr;
4012         struct cifs_io_parms io_parms;
4013         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4014                                  .rq_nvec = 1 };
4015         struct TCP_Server_Info *server;
4016         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4017         unsigned int total_len;
4018
4019         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4020                  __func__, rdata->offset, rdata->bytes);
4021
4022         if (!rdata->server)
4023                 rdata->server = cifs_pick_channel(tcon->ses);
4024
4025         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4026         io_parms.server = server = rdata->server;
4027         io_parms.offset = rdata->offset;
4028         io_parms.length = rdata->bytes;
4029         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4030         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4031         io_parms.pid = rdata->pid;
4032
4033         rc = smb2_new_read_req(
4034                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4035         if (rc)
4036                 return rc;
4037
4038         if (smb3_encryption_required(io_parms.tcon))
4039                 flags |= CIFS_TRANSFORM_REQ;
4040
4041         rdata->iov[0].iov_base = buf;
4042         rdata->iov[0].iov_len = total_len;
4043
4044         shdr = (struct smb2_sync_hdr *)buf;
4045
4046         if (rdata->credits.value > 0) {
4047                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4048                                                 SMB2_MAX_BUFFER_SIZE));
4049                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4050
4051                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4052                 if (rc)
4053                         goto async_readv_out;
4054
4055                 flags |= CIFS_HAS_CREDITS;
4056         }
4057
4058         kref_get(&rdata->refcount);
4059         rc = cifs_call_async(server, &rqst,
4060                              cifs_readv_receive, smb2_readv_callback,
4061                              smb3_handle_read_data, rdata, flags,
4062                              &rdata->credits);
4063         if (rc) {
4064                 kref_put(&rdata->refcount, cifs_readdata_release);
4065                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4066                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4067                                     io_parms.tcon->tid,
4068                                     io_parms.tcon->ses->Suid,
4069                                     io_parms.offset, io_parms.length, rc);
4070         }
4071
4072 async_readv_out:
4073         cifs_small_buf_release(buf);
4074         return rc;
4075 }
4076
4077 int
4078 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4079           unsigned int *nbytes, char **buf, int *buf_type)
4080 {
4081         struct smb_rqst rqst;
4082         int resp_buftype, rc;
4083         struct smb2_read_plain_req *req = NULL;
4084         struct smb2_read_rsp *rsp = NULL;
4085         struct kvec iov[1];
4086         struct kvec rsp_iov;
4087         unsigned int total_len;
4088         int flags = CIFS_LOG_ERROR;
4089         struct cifs_ses *ses = io_parms->tcon->ses;
4090
4091         if (!io_parms->server)
4092                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4093
4094         *nbytes = 0;
4095         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4096         if (rc)
4097                 return rc;
4098
4099         if (smb3_encryption_required(io_parms->tcon))
4100                 flags |= CIFS_TRANSFORM_REQ;
4101
4102         iov[0].iov_base = (char *)req;
4103         iov[0].iov_len = total_len;
4104
4105         memset(&rqst, 0, sizeof(struct smb_rqst));
4106         rqst.rq_iov = iov;
4107         rqst.rq_nvec = 1;
4108
4109         rc = cifs_send_recv(xid, ses, io_parms->server,
4110                             &rqst, &resp_buftype, flags, &rsp_iov);
4111         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4112
4113         if (rc) {
4114                 if (rc != -ENODATA) {
4115                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4116                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4117                         trace_smb3_read_err(xid, req->PersistentFileId,
4118                                             io_parms->tcon->tid, ses->Suid,
4119                                             io_parms->offset, io_parms->length,
4120                                             rc);
4121                 } else
4122                         trace_smb3_read_done(xid, req->PersistentFileId,
4123                                     io_parms->tcon->tid, ses->Suid,
4124                                     io_parms->offset, 0);
4125                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4126                 cifs_small_buf_release(req);
4127                 return rc == -ENODATA ? 0 : rc;
4128         } else
4129                 trace_smb3_read_done(xid, req->PersistentFileId,
4130                                     io_parms->tcon->tid, ses->Suid,
4131                                     io_parms->offset, io_parms->length);
4132
4133         cifs_small_buf_release(req);
4134
4135         *nbytes = le32_to_cpu(rsp->DataLength);
4136         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4137             (*nbytes > io_parms->length)) {
4138                 cifs_dbg(FYI, "bad length %d for count %d\n",
4139                          *nbytes, io_parms->length);
4140                 rc = -EIO;
4141                 *nbytes = 0;
4142         }
4143
4144         if (*buf) {
4145                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4146                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4147         } else if (resp_buftype != CIFS_NO_BUFFER) {
4148                 *buf = rsp_iov.iov_base;
4149                 if (resp_buftype == CIFS_SMALL_BUFFER)
4150                         *buf_type = CIFS_SMALL_BUFFER;
4151                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4152                         *buf_type = CIFS_LARGE_BUFFER;
4153         }
4154         return rc;
4155 }
4156
4157 /*
4158  * Check the mid_state and signature on received buffer (if any), and queue the
4159  * workqueue completion task.
4160  */
4161 static void
4162 smb2_writev_callback(struct mid_q_entry *mid)
4163 {
4164         struct cifs_writedata *wdata = mid->callback_data;
4165         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4166         struct TCP_Server_Info *server = wdata->server;
4167         unsigned int written;
4168         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4169         struct cifs_credits credits = { .value = 0, .instance = 0 };
4170
4171         WARN_ONCE(wdata->server != mid->server,
4172                   "wdata server %p != mid server %p",
4173                   wdata->server, mid->server);
4174
4175         switch (mid->mid_state) {
4176         case MID_RESPONSE_RECEIVED:
4177                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4178                 credits.instance = server->reconnect_instance;
4179                 wdata->result = smb2_check_receive(mid, server, 0);
4180                 if (wdata->result != 0)
4181                         break;
4182
4183                 written = le32_to_cpu(rsp->DataLength);
4184                 /*
4185                  * Mask off high 16 bits when bytes written as returned
4186                  * by the server is greater than bytes requested by the
4187                  * client. OS/2 servers are known to set incorrect
4188                  * CountHigh values.
4189                  */
4190                 if (written > wdata->bytes)
4191                         written &= 0xFFFF;
4192
4193                 if (written < wdata->bytes)
4194                         wdata->result = -ENOSPC;
4195                 else
4196                         wdata->bytes = written;
4197                 break;
4198         case MID_REQUEST_SUBMITTED:
4199         case MID_RETRY_NEEDED:
4200                 wdata->result = -EAGAIN;
4201                 break;
4202         case MID_RESPONSE_MALFORMED:
4203                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4204                 credits.instance = server->reconnect_instance;
4205                 fallthrough;
4206         default:
4207                 wdata->result = -EIO;
4208                 break;
4209         }
4210 #ifdef CONFIG_CIFS_SMB_DIRECT
4211         /*
4212          * If this wdata has a memory registered, the MR can be freed
4213          * The number of MRs available is limited, it's important to recover
4214          * used MR as soon as I/O is finished. Hold MR longer in the later
4215          * I/O process can possibly result in I/O deadlock due to lack of MR
4216          * to send request on I/O retry
4217          */
4218         if (wdata->mr) {
4219                 smbd_deregister_mr(wdata->mr);
4220                 wdata->mr = NULL;
4221         }
4222 #endif
4223         if (wdata->result) {
4224                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4225                 trace_smb3_write_err(0 /* no xid */,
4226                                      wdata->cfile->fid.persistent_fid,
4227                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4228                                      wdata->bytes, wdata->result);
4229                 if (wdata->result == -ENOSPC)
4230                         pr_warn_once("Out of space writing to %s\n",
4231                                      tcon->treeName);
4232         } else
4233                 trace_smb3_write_done(0 /* no xid */,
4234                                       wdata->cfile->fid.persistent_fid,
4235                                       tcon->tid, tcon->ses->Suid,
4236                                       wdata->offset, wdata->bytes);
4237
4238         queue_work(cifsiod_wq, &wdata->work);
4239         DeleteMidQEntry(mid);
4240         add_credits(server, &credits, 0);
4241 }
4242
4243 /* smb2_async_writev - send an async write, and set up mid to handle result */
4244 int
4245 smb2_async_writev(struct cifs_writedata *wdata,
4246                   void (*release)(struct kref *kref))
4247 {
4248         int rc = -EACCES, flags = 0;
4249         struct smb2_write_req *req = NULL;
4250         struct smb2_sync_hdr *shdr;
4251         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4252         struct TCP_Server_Info *server = wdata->server;
4253         struct kvec iov[1];
4254         struct smb_rqst rqst = { };
4255         unsigned int total_len;
4256
4257         if (!wdata->server)
4258                 server = wdata->server = cifs_pick_channel(tcon->ses);
4259
4260         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4261                                  (void **) &req, &total_len);
4262         if (rc)
4263                 return rc;
4264
4265         if (smb3_encryption_required(tcon))
4266                 flags |= CIFS_TRANSFORM_REQ;
4267
4268         shdr = (struct smb2_sync_hdr *)req;
4269         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4270
4271         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4272         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4273         req->WriteChannelInfoOffset = 0;
4274         req->WriteChannelInfoLength = 0;
4275         req->Channel = 0;
4276         req->Offset = cpu_to_le64(wdata->offset);
4277         req->DataOffset = cpu_to_le16(
4278                                 offsetof(struct smb2_write_req, Buffer));
4279         req->RemainingBytes = 0;
4280
4281         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4282                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4283 #ifdef CONFIG_CIFS_SMB_DIRECT
4284         /*
4285          * If we want to do a server RDMA read, fill in and append
4286          * smbd_buffer_descriptor_v1 to the end of write request
4287          */
4288         if (server->rdma && !server->sign && wdata->bytes >=
4289                 server->smbd_conn->rdma_readwrite_threshold) {
4290
4291                 struct smbd_buffer_descriptor_v1 *v1;
4292                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4293
4294                 wdata->mr = smbd_register_mr(
4295                                 server->smbd_conn, wdata->pages,
4296                                 wdata->nr_pages, wdata->page_offset,
4297                                 wdata->tailsz, false, need_invalidate);
4298                 if (!wdata->mr) {
4299                         rc = -EAGAIN;
4300                         goto async_writev_out;
4301                 }
4302                 req->Length = 0;
4303                 req->DataOffset = 0;
4304                 if (wdata->nr_pages > 1)
4305                         req->RemainingBytes =
4306                                 cpu_to_le32(
4307                                         (wdata->nr_pages - 1) * wdata->pagesz -
4308                                         wdata->page_offset + wdata->tailsz
4309                                 );
4310                 else
4311                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4312                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4313                 if (need_invalidate)
4314                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4315                 req->WriteChannelInfoOffset =
4316                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4317                 req->WriteChannelInfoLength =
4318                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4319                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4320                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4321                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4322                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4323         }
4324 #endif
4325         iov[0].iov_len = total_len - 1;
4326         iov[0].iov_base = (char *)req;
4327
4328         rqst.rq_iov = iov;
4329         rqst.rq_nvec = 1;
4330         rqst.rq_pages = wdata->pages;
4331         rqst.rq_offset = wdata->page_offset;
4332         rqst.rq_npages = wdata->nr_pages;
4333         rqst.rq_pagesz = wdata->pagesz;
4334         rqst.rq_tailsz = wdata->tailsz;
4335 #ifdef CONFIG_CIFS_SMB_DIRECT
4336         if (wdata->mr) {
4337                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4338                 rqst.rq_npages = 0;
4339         }
4340 #endif
4341         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4342                  wdata->offset, wdata->bytes);
4343
4344 #ifdef CONFIG_CIFS_SMB_DIRECT
4345         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4346         if (!wdata->mr)
4347                 req->Length = cpu_to_le32(wdata->bytes);
4348 #else
4349         req->Length = cpu_to_le32(wdata->bytes);
4350 #endif
4351
4352         if (wdata->credits.value > 0) {
4353                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4354                                                     SMB2_MAX_BUFFER_SIZE));
4355                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4356
4357                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4358                 if (rc)
4359                         goto async_writev_out;
4360
4361                 flags |= CIFS_HAS_CREDITS;
4362         }
4363
4364         kref_get(&wdata->refcount);
4365         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4366                              wdata, flags, &wdata->credits);
4367
4368         if (rc) {
4369                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4370                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4371                                      wdata->bytes, rc);
4372                 kref_put(&wdata->refcount, release);
4373                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4374         }
4375
4376 async_writev_out:
4377         cifs_small_buf_release(req);
4378         return rc;
4379 }
4380
4381 /*
4382  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4383  * The length field from io_parms must be at least 1 and indicates a number of
4384  * elements with data to write that begins with position 1 in iov array. All
4385  * data length is specified by count.
4386  */
4387 int
4388 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4389            unsigned int *nbytes, struct kvec *iov, int n_vec)
4390 {
4391         struct smb_rqst rqst;
4392         int rc = 0;
4393         struct smb2_write_req *req = NULL;
4394         struct smb2_write_rsp *rsp = NULL;
4395         int resp_buftype;
4396         struct kvec rsp_iov;
4397         int flags = 0;
4398         unsigned int total_len;
4399         struct TCP_Server_Info *server;
4400
4401         *nbytes = 0;
4402
4403         if (n_vec < 1)
4404                 return rc;
4405
4406         if (!io_parms->server)
4407                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4408         server = io_parms->server;
4409         if (server == NULL)
4410                 return -ECONNABORTED;
4411
4412         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4413                                  (void **) &req, &total_len);
4414         if (rc)
4415                 return rc;
4416
4417         if (smb3_encryption_required(io_parms->tcon))
4418                 flags |= CIFS_TRANSFORM_REQ;
4419
4420         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4421
4422         req->PersistentFileId = io_parms->persistent_fid;
4423         req->VolatileFileId = io_parms->volatile_fid;
4424         req->WriteChannelInfoOffset = 0;
4425         req->WriteChannelInfoLength = 0;
4426         req->Channel = 0;
4427         req->Length = cpu_to_le32(io_parms->length);
4428         req->Offset = cpu_to_le64(io_parms->offset);
4429         req->DataOffset = cpu_to_le16(
4430                                 offsetof(struct smb2_write_req, Buffer));
4431         req->RemainingBytes = 0;
4432
4433         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4434                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4435                 io_parms->offset, io_parms->length);
4436
4437         iov[0].iov_base = (char *)req;
4438         /* 1 for Buffer */
4439         iov[0].iov_len = total_len - 1;
4440
4441         memset(&rqst, 0, sizeof(struct smb_rqst));
4442         rqst.rq_iov = iov;
4443         rqst.rq_nvec = n_vec + 1;
4444
4445         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4446                             &rqst,
4447                             &resp_buftype, flags, &rsp_iov);
4448         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4449
4450         if (rc) {
4451                 trace_smb3_write_err(xid, req->PersistentFileId,
4452                                      io_parms->tcon->tid,
4453                                      io_parms->tcon->ses->Suid,
4454                                      io_parms->offset, io_parms->length, rc);
4455                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4456                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4457         } else {
4458                 *nbytes = le32_to_cpu(rsp->DataLength);
4459                 trace_smb3_write_done(xid, req->PersistentFileId,
4460                                      io_parms->tcon->tid,
4461                                      io_parms->tcon->ses->Suid,
4462                                      io_parms->offset, *nbytes);
4463         }
4464
4465         cifs_small_buf_release(req);
4466         free_rsp_buf(resp_buftype, rsp);
4467         return rc;
4468 }
4469
4470 int posix_info_sid_size(const void *beg, const void *end)
4471 {
4472         size_t subauth;
4473         int total;
4474
4475         if (beg + 1 > end)
4476                 return -1;
4477
4478         subauth = *(u8 *)(beg+1);
4479         if (subauth < 1 || subauth > 15)
4480                 return -1;
4481
4482         total = 1 + 1 + 6 + 4*subauth;
4483         if (beg + total > end)
4484                 return -1;
4485
4486         return total;
4487 }
4488
4489 int posix_info_parse(const void *beg, const void *end,
4490                      struct smb2_posix_info_parsed *out)
4491
4492 {
4493         int total_len = 0;
4494         int sid_len;
4495         int name_len;
4496         const void *owner_sid;
4497         const void *group_sid;
4498         const void *name;
4499
4500         /* if no end bound given, assume payload to be correct */
4501         if (!end) {
4502                 const struct smb2_posix_info *p = beg;
4503
4504                 end = beg + le32_to_cpu(p->NextEntryOffset);
4505                 /* last element will have a 0 offset, pick a sensible bound */
4506                 if (end == beg)
4507                         end += 0xFFFF;
4508         }
4509
4510         /* check base buf */
4511         if (beg + sizeof(struct smb2_posix_info) > end)
4512                 return -1;
4513         total_len = sizeof(struct smb2_posix_info);
4514
4515         /* check owner sid */
4516         owner_sid = beg + total_len;
4517         sid_len = posix_info_sid_size(owner_sid, end);
4518         if (sid_len < 0)
4519                 return -1;
4520         total_len += sid_len;
4521
4522         /* check group sid */
4523         group_sid = beg + total_len;
4524         sid_len = posix_info_sid_size(group_sid, end);
4525         if (sid_len < 0)
4526                 return -1;
4527         total_len += sid_len;
4528
4529         /* check name len */
4530         if (beg + total_len + 4 > end)
4531                 return -1;
4532         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4533         if (name_len < 1 || name_len > 0xFFFF)
4534                 return -1;
4535         total_len += 4;
4536
4537         /* check name */
4538         name = beg + total_len;
4539         if (name + name_len > end)
4540                 return -1;
4541         total_len += name_len;
4542
4543         if (out) {
4544                 out->base = beg;
4545                 out->size = total_len;
4546                 out->name_len = name_len;
4547                 out->name = name;
4548                 memcpy(&out->owner, owner_sid,
4549                        posix_info_sid_size(owner_sid, end));
4550                 memcpy(&out->group, group_sid,
4551                        posix_info_sid_size(group_sid, end));
4552         }
4553         return total_len;
4554 }
4555
4556 static int posix_info_extra_size(const void *beg, const void *end)
4557 {
4558         int len = posix_info_parse(beg, end, NULL);
4559
4560         if (len < 0)
4561                 return -1;
4562         return len - sizeof(struct smb2_posix_info);
4563 }
4564
4565 static unsigned int
4566 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4567             size_t size)
4568 {
4569         int len;
4570         unsigned int entrycount = 0;
4571         unsigned int next_offset = 0;
4572         char *entryptr;
4573         FILE_DIRECTORY_INFO *dir_info;
4574
4575         if (bufstart == NULL)
4576                 return 0;
4577
4578         entryptr = bufstart;
4579
4580         while (1) {
4581                 if (entryptr + next_offset < entryptr ||
4582                     entryptr + next_offset > end_of_buf ||
4583                     entryptr + next_offset + size > end_of_buf) {
4584                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4585                         break;
4586                 }
4587
4588                 entryptr = entryptr + next_offset;
4589                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4590
4591                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4592                         len = posix_info_extra_size(entryptr, end_of_buf);
4593                 else
4594                         len = le32_to_cpu(dir_info->FileNameLength);
4595
4596                 if (len < 0 ||
4597                     entryptr + len < entryptr ||
4598                     entryptr + len > end_of_buf ||
4599                     entryptr + len + size > end_of_buf) {
4600                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4601                                  end_of_buf);
4602                         break;
4603                 }
4604
4605                 *lastentry = entryptr;
4606                 entrycount++;
4607
4608                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4609                 if (!next_offset)
4610                         break;
4611         }
4612
4613         return entrycount;
4614 }
4615
4616 /*
4617  * Readdir/FindFirst
4618  */
4619 int SMB2_query_directory_init(const unsigned int xid,
4620                               struct cifs_tcon *tcon,
4621                               struct TCP_Server_Info *server,
4622                               struct smb_rqst *rqst,
4623                               u64 persistent_fid, u64 volatile_fid,
4624                               int index, int info_level)
4625 {
4626         struct smb2_query_directory_req *req;
4627         unsigned char *bufptr;
4628         __le16 asteriks = cpu_to_le16('*');
4629         unsigned int output_size = CIFSMaxBufSize -
4630                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4631                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4632         unsigned int total_len;
4633         struct kvec *iov = rqst->rq_iov;
4634         int len, rc;
4635
4636         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4637                                  (void **) &req, &total_len);
4638         if (rc)
4639                 return rc;
4640
4641         switch (info_level) {
4642         case SMB_FIND_FILE_DIRECTORY_INFO:
4643                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4644                 break;
4645         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4646                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4647                 break;
4648         case SMB_FIND_FILE_POSIX_INFO:
4649                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4650                 break;
4651         default:
4652                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4653                         info_level);
4654                 return -EINVAL;
4655         }
4656
4657         req->FileIndex = cpu_to_le32(index);
4658         req->PersistentFileId = persistent_fid;
4659         req->VolatileFileId = volatile_fid;
4660
4661         len = 0x2;
4662         bufptr = req->Buffer;
4663         memcpy(bufptr, &asteriks, len);
4664
4665         req->FileNameOffset =
4666                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4667         req->FileNameLength = cpu_to_le16(len);
4668         /*
4669          * BB could be 30 bytes or so longer if we used SMB2 specific
4670          * buffer lengths, but this is safe and close enough.
4671          */
4672         output_size = min_t(unsigned int, output_size, server->maxBuf);
4673         output_size = min_t(unsigned int, output_size, 2 << 15);
4674         req->OutputBufferLength = cpu_to_le32(output_size);
4675
4676         iov[0].iov_base = (char *)req;
4677         /* 1 for Buffer */
4678         iov[0].iov_len = total_len - 1;
4679
4680         iov[1].iov_base = (char *)(req->Buffer);
4681         iov[1].iov_len = len;
4682
4683         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4684                         tcon->ses->Suid, index, output_size);
4685
4686         return 0;
4687 }
4688
4689 void SMB2_query_directory_free(struct smb_rqst *rqst)
4690 {
4691         if (rqst && rqst->rq_iov) {
4692                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4693         }
4694 }
4695
4696 int
4697 smb2_parse_query_directory(struct cifs_tcon *tcon,
4698                            struct kvec *rsp_iov,
4699                            int resp_buftype,
4700                            struct cifs_search_info *srch_inf)
4701 {
4702         struct smb2_query_directory_rsp *rsp;
4703         size_t info_buf_size;
4704         char *end_of_smb;
4705         int rc;
4706
4707         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4708
4709         switch (srch_inf->info_level) {
4710         case SMB_FIND_FILE_DIRECTORY_INFO:
4711                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4712                 break;
4713         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4714                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4715                 break;
4716         case SMB_FIND_FILE_POSIX_INFO:
4717                 /* note that posix payload are variable size */
4718                 info_buf_size = sizeof(struct smb2_posix_info);
4719                 break;
4720         default:
4721                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4722                          srch_inf->info_level);
4723                 return -EINVAL;
4724         }
4725
4726         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4727                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4728                                info_buf_size);
4729         if (rc) {
4730                 cifs_tcon_dbg(VFS, "bad info payload");
4731                 return rc;
4732         }
4733
4734         srch_inf->unicode = true;
4735
4736         if (srch_inf->ntwrk_buf_start) {
4737                 if (srch_inf->smallBuf)
4738                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4739                 else
4740                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4741         }
4742         srch_inf->ntwrk_buf_start = (char *)rsp;
4743         srch_inf->srch_entries_start = srch_inf->last_entry =
4744                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4745         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4746
4747         srch_inf->entries_in_buffer = num_entries(
4748                 srch_inf->info_level,
4749                 srch_inf->srch_entries_start,
4750                 end_of_smb,
4751                 &srch_inf->last_entry,
4752                 info_buf_size);
4753
4754         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4755         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4756                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4757                  srch_inf->srch_entries_start, srch_inf->last_entry);
4758         if (resp_buftype == CIFS_LARGE_BUFFER)
4759                 srch_inf->smallBuf = false;
4760         else if (resp_buftype == CIFS_SMALL_BUFFER)
4761                 srch_inf->smallBuf = true;
4762         else
4763                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4764
4765         return 0;
4766 }
4767
4768 int
4769 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4770                      u64 persistent_fid, u64 volatile_fid, int index,
4771                      struct cifs_search_info *srch_inf)
4772 {
4773         struct smb_rqst rqst;
4774         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4775         struct smb2_query_directory_rsp *rsp = NULL;
4776         int resp_buftype = CIFS_NO_BUFFER;
4777         struct kvec rsp_iov;
4778         int rc = 0;
4779         struct cifs_ses *ses = tcon->ses;
4780         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4781         int flags = 0;
4782
4783         if (!ses || !(ses->server))
4784                 return -EIO;
4785
4786         if (smb3_encryption_required(tcon))
4787                 flags |= CIFS_TRANSFORM_REQ;
4788
4789         memset(&rqst, 0, sizeof(struct smb_rqst));
4790         memset(&iov, 0, sizeof(iov));
4791         rqst.rq_iov = iov;
4792         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4793
4794         rc = SMB2_query_directory_init(xid, tcon, server,
4795                                        &rqst, persistent_fid,
4796                                        volatile_fid, index,
4797                                        srch_inf->info_level);
4798         if (rc)
4799                 goto qdir_exit;
4800
4801         rc = cifs_send_recv(xid, ses, server,
4802                             &rqst, &resp_buftype, flags, &rsp_iov);
4803         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4804
4805         if (rc) {
4806                 if (rc == -ENODATA &&
4807                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4808                         trace_smb3_query_dir_done(xid, persistent_fid,
4809                                 tcon->tid, tcon->ses->Suid, index, 0);
4810                         srch_inf->endOfSearch = true;
4811                         rc = 0;
4812                 } else {
4813                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4814                                 tcon->ses->Suid, index, 0, rc);
4815                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4816                 }
4817                 goto qdir_exit;
4818         }
4819
4820         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4821                                         srch_inf);
4822         if (rc) {
4823                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4824                         tcon->ses->Suid, index, 0, rc);
4825                 goto qdir_exit;
4826         }
4827         resp_buftype = CIFS_NO_BUFFER;
4828
4829         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4830                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4831
4832 qdir_exit:
4833         SMB2_query_directory_free(&rqst);
4834         free_rsp_buf(resp_buftype, rsp);
4835         return rc;
4836 }
4837
4838 int
4839 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4840                    struct smb_rqst *rqst,
4841                    u64 persistent_fid, u64 volatile_fid, u32 pid,
4842                    u8 info_class, u8 info_type, u32 additional_info,
4843                    void **data, unsigned int *size)
4844 {
4845         struct smb2_set_info_req *req;
4846         struct kvec *iov = rqst->rq_iov;
4847         unsigned int i, total_len;
4848         int rc;
4849
4850         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4851                                  (void **) &req, &total_len);
4852         if (rc)
4853                 return rc;
4854
4855         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4856         req->InfoType = info_type;
4857         req->FileInfoClass = info_class;
4858         req->PersistentFileId = persistent_fid;
4859         req->VolatileFileId = volatile_fid;
4860         req->AdditionalInformation = cpu_to_le32(additional_info);
4861
4862         req->BufferOffset =
4863                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4864         req->BufferLength = cpu_to_le32(*size);
4865
4866         memcpy(req->Buffer, *data, *size);
4867         total_len += *size;
4868
4869         iov[0].iov_base = (char *)req;
4870         /* 1 for Buffer */
4871         iov[0].iov_len = total_len - 1;
4872
4873         for (i = 1; i < rqst->rq_nvec; i++) {
4874                 le32_add_cpu(&req->BufferLength, size[i]);
4875                 iov[i].iov_base = (char *)data[i];
4876                 iov[i].iov_len = size[i];
4877         }
4878
4879         return 0;
4880 }
4881
4882 void
4883 SMB2_set_info_free(struct smb_rqst *rqst)
4884 {
4885         if (rqst && rqst->rq_iov)
4886                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4887 }
4888
4889 static int
4890 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4891                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4892                u8 info_type, u32 additional_info, unsigned int num,
4893                 void **data, unsigned int *size)
4894 {
4895         struct smb_rqst rqst;
4896         struct smb2_set_info_rsp *rsp = NULL;
4897         struct kvec *iov;
4898         struct kvec rsp_iov;
4899         int rc = 0;
4900         int resp_buftype;
4901         struct cifs_ses *ses = tcon->ses;
4902         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4903         int flags = 0;
4904
4905         if (!ses || !server)
4906                 return -EIO;
4907
4908         if (!num)
4909                 return -EINVAL;
4910
4911         if (smb3_encryption_required(tcon))
4912                 flags |= CIFS_TRANSFORM_REQ;
4913
4914         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4915         if (!iov)
4916                 return -ENOMEM;
4917
4918         memset(&rqst, 0, sizeof(struct smb_rqst));
4919         rqst.rq_iov = iov;
4920         rqst.rq_nvec = num;
4921
4922         rc = SMB2_set_info_init(tcon, server,
4923                                 &rqst, persistent_fid, volatile_fid, pid,
4924                                 info_class, info_type, additional_info,
4925                                 data, size);
4926         if (rc) {
4927                 kfree(iov);
4928                 return rc;
4929         }
4930
4931
4932         rc = cifs_send_recv(xid, ses, server,
4933                             &rqst, &resp_buftype, flags,
4934                             &rsp_iov);
4935         SMB2_set_info_free(&rqst);
4936         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4937
4938         if (rc != 0) {
4939                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4940                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4941                                 ses->Suid, info_class, (__u32)info_type, rc);
4942         }
4943
4944         free_rsp_buf(resp_buftype, rsp);
4945         kfree(iov);
4946         return rc;
4947 }
4948
4949 int
4950 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4951              u64 volatile_fid, u32 pid, __le64 *eof)
4952 {
4953         struct smb2_file_eof_info info;
4954         void *data;
4955         unsigned int size;
4956
4957         info.EndOfFile = *eof;
4958
4959         data = &info;
4960         size = sizeof(struct smb2_file_eof_info);
4961
4962         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4963                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4964                         0, 1, &data, &size);
4965 }
4966
4967 int
4968 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4969                 u64 persistent_fid, u64 volatile_fid,
4970                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4971 {
4972         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4973                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4974                         1, (void **)&pnntsd, &pacllen);
4975 }
4976
4977 int
4978 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4979             u64 persistent_fid, u64 volatile_fid,
4980             struct smb2_file_full_ea_info *buf, int len)
4981 {
4982         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4983                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4984                 0, 1, (void **)&buf, &len);
4985 }
4986
4987 int
4988 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4989                   const u64 persistent_fid, const u64 volatile_fid,
4990                   __u8 oplock_level)
4991 {
4992         struct smb_rqst rqst;
4993         int rc;
4994         struct smb2_oplock_break *req = NULL;
4995         struct cifs_ses *ses = tcon->ses;
4996         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4997         int flags = CIFS_OBREAK_OP;
4998         unsigned int total_len;
4999         struct kvec iov[1];
5000         struct kvec rsp_iov;
5001         int resp_buf_type;
5002
5003         cifs_dbg(FYI, "SMB2_oplock_break\n");
5004         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5005                                  (void **) &req, &total_len);
5006         if (rc)
5007                 return rc;
5008
5009         if (smb3_encryption_required(tcon))
5010                 flags |= CIFS_TRANSFORM_REQ;
5011
5012         req->VolatileFid = volatile_fid;
5013         req->PersistentFid = persistent_fid;
5014         req->OplockLevel = oplock_level;
5015         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5016
5017         flags |= CIFS_NO_RSP_BUF;
5018
5019         iov[0].iov_base = (char *)req;
5020         iov[0].iov_len = total_len;
5021
5022         memset(&rqst, 0, sizeof(struct smb_rqst));
5023         rqst.rq_iov = iov;
5024         rqst.rq_nvec = 1;
5025
5026         rc = cifs_send_recv(xid, ses, server,
5027                             &rqst, &resp_buf_type, flags, &rsp_iov);
5028         cifs_small_buf_release(req);
5029
5030         if (rc) {
5031                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5032                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5033         }
5034
5035         return rc;
5036 }
5037
5038 void
5039 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5040                              struct kstatfs *kst)
5041 {
5042         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5043                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5044         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5045         kst->f_bfree  = kst->f_bavail =
5046                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5047         return;
5048 }
5049
5050 static void
5051 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5052                         struct kstatfs *kst)
5053 {
5054         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5055         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5056         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5057         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5058                 kst->f_bavail = kst->f_bfree;
5059         else
5060                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5061         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5062                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5063         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5064                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5065
5066         return;
5067 }
5068
5069 static int
5070 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5071                    struct TCP_Server_Info *server,
5072                    int level, int outbuf_len, u64 persistent_fid,
5073                    u64 volatile_fid)
5074 {
5075         int rc;
5076         struct smb2_query_info_req *req;
5077         unsigned int total_len;
5078
5079         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5080
5081         if ((tcon->ses == NULL) || server == NULL)
5082                 return -EIO;
5083
5084         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5085                                  (void **) &req, &total_len);
5086         if (rc)
5087                 return rc;
5088
5089         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5090         req->FileInfoClass = level;
5091         req->PersistentFileId = persistent_fid;
5092         req->VolatileFileId = volatile_fid;
5093         /* 1 for pad */
5094         req->InputBufferOffset =
5095                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5096         req->OutputBufferLength = cpu_to_le32(
5097                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5098
5099         iov->iov_base = (char *)req;
5100         iov->iov_len = total_len;
5101         return 0;
5102 }
5103
5104 int
5105 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5106               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5107 {
5108         struct smb_rqst rqst;
5109         struct smb2_query_info_rsp *rsp = NULL;
5110         struct kvec iov;
5111         struct kvec rsp_iov;
5112         int rc = 0;
5113         int resp_buftype;
5114         struct cifs_ses *ses = tcon->ses;
5115         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5116         FILE_SYSTEM_POSIX_INFO *info = NULL;
5117         int flags = 0;
5118
5119         rc = build_qfs_info_req(&iov, tcon, server,
5120                                 FS_POSIX_INFORMATION,
5121                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5122                                 persistent_fid, volatile_fid);
5123         if (rc)
5124                 return rc;
5125
5126         if (smb3_encryption_required(tcon))
5127                 flags |= CIFS_TRANSFORM_REQ;
5128
5129         memset(&rqst, 0, sizeof(struct smb_rqst));
5130         rqst.rq_iov = &iov;
5131         rqst.rq_nvec = 1;
5132
5133         rc = cifs_send_recv(xid, ses, server,
5134                             &rqst, &resp_buftype, flags, &rsp_iov);
5135         cifs_small_buf_release(iov.iov_base);
5136         if (rc) {
5137                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5138                 goto posix_qfsinf_exit;
5139         }
5140         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5141
5142         info = (FILE_SYSTEM_POSIX_INFO *)(
5143                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5144         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5145                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5146                                sizeof(FILE_SYSTEM_POSIX_INFO));
5147         if (!rc)
5148                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5149
5150 posix_qfsinf_exit:
5151         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5152         return rc;
5153 }
5154
5155 int
5156 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5157               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5158 {
5159         struct smb_rqst rqst;
5160         struct smb2_query_info_rsp *rsp = NULL;
5161         struct kvec iov;
5162         struct kvec rsp_iov;
5163         int rc = 0;
5164         int resp_buftype;
5165         struct cifs_ses *ses = tcon->ses;
5166         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5167         struct smb2_fs_full_size_info *info = NULL;
5168         int flags = 0;
5169
5170         rc = build_qfs_info_req(&iov, tcon, server,
5171                                 FS_FULL_SIZE_INFORMATION,
5172                                 sizeof(struct smb2_fs_full_size_info),
5173                                 persistent_fid, volatile_fid);
5174         if (rc)
5175                 return rc;
5176
5177         if (smb3_encryption_required(tcon))
5178                 flags |= CIFS_TRANSFORM_REQ;
5179
5180         memset(&rqst, 0, sizeof(struct smb_rqst));
5181         rqst.rq_iov = &iov;
5182         rqst.rq_nvec = 1;
5183
5184         rc = cifs_send_recv(xid, ses, server,
5185                             &rqst, &resp_buftype, flags, &rsp_iov);
5186         cifs_small_buf_release(iov.iov_base);
5187         if (rc) {
5188                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5189                 goto qfsinf_exit;
5190         }
5191         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5192
5193         info = (struct smb2_fs_full_size_info *)(
5194                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5195         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5196                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5197                                sizeof(struct smb2_fs_full_size_info));
5198         if (!rc)
5199                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5200
5201 qfsinf_exit:
5202         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5203         return rc;
5204 }
5205
5206 int
5207 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5208               u64 persistent_fid, u64 volatile_fid, int level)
5209 {
5210         struct smb_rqst rqst;
5211         struct smb2_query_info_rsp *rsp = NULL;
5212         struct kvec iov;
5213         struct kvec rsp_iov;
5214         int rc = 0;
5215         int resp_buftype, max_len, min_len;
5216         struct cifs_ses *ses = tcon->ses;
5217         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5218         unsigned int rsp_len, offset;
5219         int flags = 0;
5220
5221         if (level == FS_DEVICE_INFORMATION) {
5222                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5223                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5224         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5225                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5226                 min_len = MIN_FS_ATTR_INFO_SIZE;
5227         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5228                 max_len = sizeof(struct smb3_fs_ss_info);
5229                 min_len = sizeof(struct smb3_fs_ss_info);
5230         } else if (level == FS_VOLUME_INFORMATION) {
5231                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5232                 min_len = sizeof(struct smb3_fs_vol_info);
5233         } else {
5234                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5235                 return -EINVAL;
5236         }
5237
5238         rc = build_qfs_info_req(&iov, tcon, server,
5239                                 level, max_len,
5240                                 persistent_fid, volatile_fid);
5241         if (rc)
5242                 return rc;
5243
5244         if (smb3_encryption_required(tcon))
5245                 flags |= CIFS_TRANSFORM_REQ;
5246
5247         memset(&rqst, 0, sizeof(struct smb_rqst));
5248         rqst.rq_iov = &iov;
5249         rqst.rq_nvec = 1;
5250
5251         rc = cifs_send_recv(xid, ses, server,
5252                             &rqst, &resp_buftype, flags, &rsp_iov);
5253         cifs_small_buf_release(iov.iov_base);
5254         if (rc) {
5255                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5256                 goto qfsattr_exit;
5257         }
5258         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5259
5260         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5261         offset = le16_to_cpu(rsp->OutputBufferOffset);
5262         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5263         if (rc)
5264                 goto qfsattr_exit;
5265
5266         if (level == FS_ATTRIBUTE_INFORMATION)
5267                 memcpy(&tcon->fsAttrInfo, offset
5268                         + (char *)rsp, min_t(unsigned int,
5269                         rsp_len, max_len));
5270         else if (level == FS_DEVICE_INFORMATION)
5271                 memcpy(&tcon->fsDevInfo, offset
5272                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5273         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5274                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5275                         (offset + (char *)rsp);
5276                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5277                 tcon->perf_sector_size =
5278                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5279         } else if (level == FS_VOLUME_INFORMATION) {
5280                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5281                         (offset + (char *)rsp);
5282                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5283                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5284         }
5285
5286 qfsattr_exit:
5287         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5288         return rc;
5289 }
5290
5291 int
5292 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5293            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5294            const __u32 num_lock, struct smb2_lock_element *buf)
5295 {
5296         struct smb_rqst rqst;
5297         int rc = 0;
5298         struct smb2_lock_req *req = NULL;
5299         struct kvec iov[2];
5300         struct kvec rsp_iov;
5301         int resp_buf_type;
5302         unsigned int count;
5303         int flags = CIFS_NO_RSP_BUF;
5304         unsigned int total_len;
5305         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5306
5307         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5308
5309         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5310                                  (void **) &req, &total_len);
5311         if (rc)
5312                 return rc;
5313
5314         if (smb3_encryption_required(tcon))
5315                 flags |= CIFS_TRANSFORM_REQ;
5316
5317         req->sync_hdr.ProcessId = cpu_to_le32(pid);
5318         req->LockCount = cpu_to_le16(num_lock);
5319
5320         req->PersistentFileId = persist_fid;
5321         req->VolatileFileId = volatile_fid;
5322
5323         count = num_lock * sizeof(struct smb2_lock_element);
5324
5325         iov[0].iov_base = (char *)req;
5326         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5327         iov[1].iov_base = (char *)buf;
5328         iov[1].iov_len = count;
5329
5330         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5331
5332         memset(&rqst, 0, sizeof(struct smb_rqst));
5333         rqst.rq_iov = iov;
5334         rqst.rq_nvec = 2;
5335
5336         rc = cifs_send_recv(xid, tcon->ses, server,
5337                             &rqst, &resp_buf_type, flags,
5338                             &rsp_iov);
5339         cifs_small_buf_release(req);
5340         if (rc) {
5341                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5342                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5343                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5344                                     tcon->ses->Suid, rc);
5345         }
5346
5347         return rc;
5348 }
5349
5350 int
5351 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5352           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5353           const __u64 length, const __u64 offset, const __u32 lock_flags,
5354           const bool wait)
5355 {
5356         struct smb2_lock_element lock;
5357
5358         lock.Offset = cpu_to_le64(offset);
5359         lock.Length = cpu_to_le64(length);
5360         lock.Flags = cpu_to_le32(lock_flags);
5361         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5362                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5363
5364         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5365 }
5366
5367 int
5368 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5369                  __u8 *lease_key, const __le32 lease_state)
5370 {
5371         struct smb_rqst rqst;
5372         int rc;
5373         struct smb2_lease_ack *req = NULL;
5374         struct cifs_ses *ses = tcon->ses;
5375         int flags = CIFS_OBREAK_OP;
5376         unsigned int total_len;
5377         struct kvec iov[1];
5378         struct kvec rsp_iov;
5379         int resp_buf_type;
5380         __u64 *please_key_high;
5381         __u64 *please_key_low;
5382         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5383
5384         cifs_dbg(FYI, "SMB2_lease_break\n");
5385         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5386                                  (void **) &req, &total_len);
5387         if (rc)
5388                 return rc;
5389
5390         if (smb3_encryption_required(tcon))
5391                 flags |= CIFS_TRANSFORM_REQ;
5392
5393         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5394         req->StructureSize = cpu_to_le16(36);
5395         total_len += 12;
5396
5397         memcpy(req->LeaseKey, lease_key, 16);
5398         req->LeaseState = lease_state;
5399
5400         flags |= CIFS_NO_RSP_BUF;
5401
5402         iov[0].iov_base = (char *)req;
5403         iov[0].iov_len = total_len;
5404
5405         memset(&rqst, 0, sizeof(struct smb_rqst));
5406         rqst.rq_iov = iov;
5407         rqst.rq_nvec = 1;
5408
5409         rc = cifs_send_recv(xid, ses, server,
5410                             &rqst, &resp_buf_type, flags, &rsp_iov);
5411         cifs_small_buf_release(req);
5412
5413         please_key_low = (__u64 *)lease_key;
5414         please_key_high = (__u64 *)(lease_key+8);
5415         if (rc) {
5416                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5417                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5418                         ses->Suid, *please_key_low, *please_key_high, rc);
5419                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5420         } else
5421                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5422                         ses->Suid, *please_key_low, *please_key_high);
5423
5424         return rc;
5425 }