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
  52 /*
  53  *  The following table defines the expected "StructureSize" of SMB2 requests
  54  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  55  *
  56  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  57  *  indexed by command in host byte order.
  58  */
  59 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  60         /* SMB2_NEGOTIATE */ 36,
  61         /* SMB2_SESSION_SETUP */ 25,
  62         /* SMB2_LOGOFF */ 4,
  63         /* SMB2_TREE_CONNECT */ 9,
  64         /* SMB2_TREE_DISCONNECT */ 4,
  65         /* SMB2_CREATE */ 57,
  66         /* SMB2_CLOSE */ 24,
  67         /* SMB2_FLUSH */ 24,
  68         /* SMB2_READ */ 49,
  69         /* SMB2_WRITE */ 49,
  70         /* SMB2_LOCK */ 48,
  71         /* SMB2_IOCTL */ 57,
  72         /* SMB2_CANCEL */ 4,
  73         /* SMB2_ECHO */ 4,
  74         /* SMB2_QUERY_DIRECTORY */ 33,
  75         /* SMB2_CHANGE_NOTIFY */ 32,
  76         /* SMB2_QUERY_INFO */ 41,
  77         /* SMB2_SET_INFO */ 33,
  78         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  79 };
  80
  81 static int encryption_required(const struct cifs_tcon *tcon)
  82 {
  83         if (!tcon)
  84                 return 0;
  85         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  86             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  87                 return 1;
  88         if (tcon->seal &&
  89             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  90                 return 1;
  91         return 0;
  92 }
  93
  94 static void
  95 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
  96                   const struct cifs_tcon *tcon)
  97 {
  98         shdr->ProtocolId = SMB2_PROTO_NUMBER;
  99         shdr->StructureSize = cpu_to_le16(64);
 100         shdr->Command = smb2_cmd;
 101         if (tcon && tcon->ses && tcon->ses->server) {
 102                 struct TCP_Server_Info *server = tcon->ses->server;
 103
 104                 spin_lock(&server->req_lock);
 105                 /* Request up to 2 credits but don't go over the limit. */
 106                 if (server->credits >= server->max_credits)
 107                         shdr->CreditRequest = cpu_to_le16(0);
 108                 else
 109                         shdr->CreditRequest = cpu_to_le16(
 110                                 min_t(int, server->max_credits -
 111                                                 server->credits, 2));
 112                 spin_unlock(&server->req_lock);
 113         } else {
 114                 shdr->CreditRequest = cpu_to_le16(2);
 115         }
 116         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 117
 118         if (!tcon)
 119                 goto out;
 120
 121         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 122         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 123         if ((tcon->ses) && (tcon->ses->server) &&
 124             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 125                 shdr->CreditCharge = cpu_to_le16(1);
 126         /* else CreditCharge MBZ */
 127
 128         shdr->TreeId = tcon->tid;
 129         /* Uid is not converted */
 130         if (tcon->ses)
 131                 shdr->SessionId = tcon->ses->Suid;
 132
 133         /*
 134          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 135          * to pass the path on the Open SMB prefixed by \\server\share.
 136          * Not sure when we would need to do the augmented path (if ever) and
 137          * setting this flag breaks the SMB2 open operation since it is
 138          * illegal to send an empty path name (without \\server\share prefix)
 139          * when the DFS flag is set in the SMB open header. We could
 140          * consider setting the flag on all operations other than open
 141          * but it is safer to net set it for now.
 142          */
 143 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 144                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 145
 146         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 147             !encryption_required(tcon))
 148                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 149 out:
 150         return;
 151 }
 152
 153 static int
 154 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 155 {
 156         int rc = 0;
 157         struct nls_table *nls_codepage;
 158         struct cifs_ses *ses;
 159         struct TCP_Server_Info *server;
 160
 161         /*
 162          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 163          * check for tcp and smb session status done differently
 164          * for those three - in the calling routine.
 165          */
 166         if (tcon == NULL)
 167                 return rc;
 168
 169         if (smb2_command == SMB2_TREE_CONNECT)
 170                 return rc;
 171
 172         if (tcon->tidStatus == CifsExiting) {
 173                 /*
 174                  * only tree disconnect, open, and write,
 175                  * (and ulogoff which does not have tcon)
 176                  * are allowed as we start force umount.
 177                  */
 178                 if ((smb2_command != SMB2_WRITE) &&
 179                    (smb2_command != SMB2_CREATE) &&
 180                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 181                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 182                                  smb2_command);
 183                         return -ENODEV;
 184                 }
 185         }
 186         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 187             (!tcon->ses->server))
 188                 return -EIO;
 189
 190         ses = tcon->ses;
 191         server = ses->server;
 192
 193         /*
 194          * Give demultiplex thread up to 10 seconds to reconnect, should be
 195          * greater than cifs socket timeout which is 7 seconds
 196          */
 197         while (server->tcpStatus == CifsNeedReconnect) {
 198                 /*
 199                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 200                  * here since they are implicitly done when session drops.
 201                  */
 202                 switch (smb2_command) {
 203                 /*
 204                  * BB Should we keep oplock break and add flush to exceptions?
 205                  */
 206                 case SMB2_TREE_DISCONNECT:
 207                 case SMB2_CANCEL:
 208                 case SMB2_CLOSE:
 209                 case SMB2_OPLOCK_BREAK:
 210                         return -EAGAIN;
 211                 }
 212
 213                 wait_event_interruptible_timeout(server->response_q,
 214                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 215
 216                 /* are we still trying to reconnect? */
 217                 if (server->tcpStatus != CifsNeedReconnect)
 218                         break;
 219
 220                 /*
 221                  * on "soft" mounts we wait once. Hard mounts keep
 222                  * retrying until process is killed or server comes
 223                  * back on-line
 224                  */
 225                 if (!tcon->retry) {
 226                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 227                         return -EHOSTDOWN;
 228                 }
 229         }
 230
 231         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 232                 return rc;
 233
 234         nls_codepage = load_nls_default();
 235
 236         /*
 237          * need to prevent multiple threads trying to simultaneously reconnect
 238          * the same SMB session
 239          */
 240         mutex_lock(&tcon->ses->session_mutex);
 241
 242         /*
 243          * Recheck after acquire mutex. If another thread is negotiating
 244          * and the server never sends an answer the socket will be closed
 245          * and tcpStatus set to reconnect.
 246          */
 247         if (server->tcpStatus == CifsNeedReconnect) {
 248                 rc = -EHOSTDOWN;
 249                 mutex_unlock(&tcon->ses->session_mutex);
 250                 goto out;
 251         }
 252
 253         rc = cifs_negotiate_protocol(0, tcon->ses);
 254         if (!rc && tcon->ses->need_reconnect)
 255                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 256
 257         if (rc || !tcon->need_reconnect) {
 258                 mutex_unlock(&tcon->ses->session_mutex);
 259                 goto out;
 260         }
 261
 262         cifs_mark_open_files_invalid(tcon);
 263         if (tcon->use_persistent)
 264                 tcon->need_reopen_files = true;
 265
 266         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 267         mutex_unlock(&tcon->ses->session_mutex);
 268
 269         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 270         if (rc)
 271                 goto out;
 272
 273         if (smb2_command != SMB2_INTERNAL_CMD)
 274                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 275
 276         atomic_inc(&tconInfoReconnectCount);
 277 out:
 278         /*
 279          * Check if handle based operation so we know whether we can continue
 280          * or not without returning to caller to reset file handle.
 281          */
 282         /*
 283          * BB Is flush done by server on drop of tcp session? Should we special
 284          * case it and skip above?
 285          */
 286         switch (smb2_command) {
 287         case SMB2_FLUSH:
 288         case SMB2_READ:
 289         case SMB2_WRITE:
 290         case SMB2_LOCK:
 291         case SMB2_IOCTL:
 292         case SMB2_QUERY_DIRECTORY:
 293         case SMB2_CHANGE_NOTIFY:
 294         case SMB2_QUERY_INFO:
 295         case SMB2_SET_INFO:
 296                 rc = -EAGAIN;
 297         }
 298         unload_nls(nls_codepage);
 299         return rc;
 300 }
 301
 302 static void
 303 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 304                unsigned int *total_len)
 305 {
 306         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 307         /* lookup word count ie StructureSize from table */
 308         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 309
 310         /*
 311          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 312          * largest operations (Create)
 313          */
 314         memset(buf, 0, 256);
 315
 316         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 317         spdu->StructureSize2 = cpu_to_le16(parmsize);
 318
 319         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 320 }
 321
 322 /* init request without RFC1001 length at the beginning */
 323 static int
 324 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 325                     void **request_buf, unsigned int *total_len)
 326 {
 327         int rc;
 328         struct smb2_sync_hdr *shdr;
 329
 330         rc = smb2_reconnect(smb2_command, tcon);
 331         if (rc)
 332                 return rc;
 333
 334         /* BB eventually switch this to SMB2 specific small buf size */
 335         *request_buf = cifs_small_buf_get();
 336         if (*request_buf == NULL) {
 337                 /* BB should we add a retry in here if not a writepage? */
 338                 return -ENOMEM;
 339         }
 340
 341         shdr = (struct smb2_sync_hdr *)(*request_buf);
 342
 343         fill_small_buf(smb2_command, tcon, shdr, total_len);
 344
 345         if (tcon != NULL) {
 346 #ifdef CONFIG_CIFS_STATS2
 347                 uint16_t com_code = le16_to_cpu(smb2_command);
 348
 349                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 350 #endif
 351                 cifs_stats_inc(&tcon->num_smbs_sent);
 352         }
 353
 354         return rc;
 355 }
 356
 357 /*
 358  * Allocate and return pointer to an SMB request hdr, and set basic
 359  * SMB information in the SMB header. If the return code is zero, this
 360  * function must have filled in request_buf pointer. The returned buffer
 361  * has RFC1001 length at the beginning.
 362  */
 363 static int
 364 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 365                 void **request_buf)
 366 {
 367         int rc;
 368         unsigned int total_len;
 369         struct smb2_pdu *pdu;
 370
 371         rc = smb2_reconnect(smb2_command, tcon);
 372         if (rc)
 373                 return rc;
 374
 375         /* BB eventually switch this to SMB2 specific small buf size */
 376         *request_buf = cifs_small_buf_get();
 377         if (*request_buf == NULL) {
 378                 /* BB should we add a retry in here if not a writepage? */
 379                 return -ENOMEM;
 380         }
 381
 382         pdu = (struct smb2_pdu *)(*request_buf);
 383
 384         fill_small_buf(smb2_command, tcon, get_sync_hdr(pdu), &total_len);
 385
 386         /* Note this is only network field converted to big endian */
 387         pdu->hdr.smb2_buf_length = cpu_to_be32(total_len);
 388
 389         if (tcon != NULL) {
 390 #ifdef CONFIG_CIFS_STATS2
 391                 uint16_t com_code = le16_to_cpu(smb2_command);
 392                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 393 #endif
 394                 cifs_stats_inc(&tcon->num_smbs_sent);
 395         }
 396
 397         return rc;
 398 }
 399
 400 #ifdef CONFIG_CIFS_SMB311
 401 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
 402 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
 403
 404
 405 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 406 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 407
 408 static void
 409 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 410 {
 411         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 412         pneg_ctxt->DataLength = cpu_to_le16(38);
 413         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 414         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 415         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 416         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 417 }
 418
 419 static void
 420 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 421 {
 422         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 423         pneg_ctxt->DataLength = cpu_to_le16(6);
 424         pneg_ctxt->CipherCount = cpu_to_le16(2);
 425         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 426         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 427 }
 428
 429 static void
 430 assemble_neg_contexts(struct smb2_negotiate_req *req)
 431 {
 432
 433         /* +4 is to account for the RFC1001 len field */
 434         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
 435
 436         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 437         /* Add 2 to size to round to 8 byte boundary */
 438         pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
 439         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 440         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 441         req->NegotiateContextCount = cpu_to_le16(2);
 442         inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
 443                         + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
 444 }
 445 #else
 446 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
 447 {
 448         return;
 449 }
 450 #endif /* SMB311 */
 451
 452 /*
 453  *
 454  *      SMB2 Worker functions follow:
 455  *
 456  *      The general structure of the worker functions is:
 457  *      1) Call smb2_init (assembles SMB2 header)
 458  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 459  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 460  *      4) Decode SMB2 command specific fields in the fixed length area
 461  *      5) Decode variable length data area (if any for this SMB2 command type)
 462  *      6) Call free smb buffer
 463  *      7) return
 464  *
 465  */
 466
 467 int
 468 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 469 {
 470         struct smb2_negotiate_req *req;
 471         struct smb2_negotiate_rsp *rsp;
 472         struct kvec iov[1];
 473         struct kvec rsp_iov;
 474         int rc = 0;
 475         int resp_buftype;
 476         struct TCP_Server_Info *server = ses->server;
 477         int blob_offset, blob_length;
 478         char *security_blob;
 479         int flags = CIFS_NEG_OP;
 480
 481         cifs_dbg(FYI, "Negotiate protocol\n");
 482
 483         if (!server) {
 484                 WARN(1, "%s: server is NULL!\n", __func__);
 485                 return -EIO;
 486         }
 487
 488         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 489         if (rc)
 490                 return rc;
 491
 492         req->hdr.sync_hdr.SessionId = 0;
 493
 494         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 495
 496         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 497         inc_rfc1001_len(req, 2);
 498
 499         /* only one of SMB2 signing flags may be set in SMB2 request */
 500         if (ses->sign)
 501                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 502         else if (global_secflags & CIFSSEC_MAY_SIGN)
 503                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 504         else
 505                 req->SecurityMode = 0;
 506
 507         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 508
 509         /* ClientGUID must be zero for SMB2.02 dialect */
 510         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 511                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 512         else {
 513                 memcpy(req->ClientGUID, server->client_guid,
 514                         SMB2_CLIENT_GUID_SIZE);
 515                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 516                         assemble_neg_contexts(req);
 517         }
 518         iov[0].iov_base = (char *)req;
 519         /* 4 for rfc1002 length field */
 520         iov[0].iov_len = get_rfc1002_length(req) + 4;
 521
 522         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
 523         cifs_small_buf_release(req);
 524         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 525         /*
 526          * No tcon so can't do
 527          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 528          */
 529         if (rc == -EOPNOTSUPP) {
 530                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 531                         "specifying vers=1.0 or vers=2.1 on mount for accessing"
 532                         " older servers\n");
 533                 goto neg_exit;
 534         } else if (rc != 0)
 535                 goto neg_exit;
 536
 537         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 538
 539         /* BB we may eventually want to match the negotiated vs. requested
 540            dialect, even though we are only requesting one at a time */
 541         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 542                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 543         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 544                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 545         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 546                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 547         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 548                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 549 #ifdef CONFIG_CIFS_SMB311
 550         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 551                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 552 #endif /* SMB311 */
 553         else {
 554                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 555                          le16_to_cpu(rsp->DialectRevision));
 556                 rc = -EIO;
 557                 goto neg_exit;
 558         }
 559         server->dialect = le16_to_cpu(rsp->DialectRevision);
 560
 561         /* SMB2 only has an extended negflavor */
 562         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 563         /* set it to the maximum buffer size value we can send with 1 credit */
 564         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 565                                SMB2_MAX_BUFFER_SIZE);
 566         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 567         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 568         /* BB Do we need to validate the SecurityMode? */
 569         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 570         server->capabilities = le32_to_cpu(rsp->Capabilities);
 571         /* Internal types */
 572         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 573
 574         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 575                                                &rsp->hdr);
 576         /*
 577          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 578          * for us will be
 579          *      ses->sectype = RawNTLMSSP;
 580          * but for time being this is our only auth choice so doesn't matter.
 581          * We just found a server which sets blob length to zero expecting raw.
 582          */
 583         if (blob_length == 0) {
 584                 cifs_dbg(FYI, "missing security blob on negprot\n");
 585                 server->sec_ntlmssp = true;
 586         }
 587
 588         rc = cifs_enable_signing(server, ses->sign);
 589         if (rc)
 590                 goto neg_exit;
 591         if (blob_length) {
 592                 rc = decode_negTokenInit(security_blob, blob_length, server);
 593                 if (rc == 1)
 594                         rc = 0;
 595                 else if (rc == 0)
 596                         rc = -EIO;
 597         }
 598 neg_exit:
 599         free_rsp_buf(resp_buftype, rsp);
 600         return rc;
 601 }
 602
 603 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 604 {
 605         int rc = 0;
 606         struct validate_negotiate_info_req vneg_inbuf;
 607         struct validate_negotiate_info_rsp *pneg_rsp;
 608         u32 rsplen;
 609
 610         cifs_dbg(FYI, "validate negotiate\n");
 611
 612         /*
 613          * validation ioctl must be signed, so no point sending this if we
 614          * can not sign it.  We could eventually change this to selectively
 615          * sign just this, the first and only signed request on a connection.
 616          * This is good enough for now since a user who wants better security
 617          * would also enable signing on the mount. Having validation of
 618          * negotiate info for signed connections helps reduce attack vectors
 619          */
 620         if (tcon->ses->server->sign == false)
 621                 return 0; /* validation requires signing */
 622
 623         vneg_inbuf.Capabilities =
 624                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 625         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 626                                         SMB2_CLIENT_GUID_SIZE);
 627
 628         if (tcon->ses->sign)
 629                 vneg_inbuf.SecurityMode =
 630                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 631         else if (global_secflags & CIFSSEC_MAY_SIGN)
 632                 vneg_inbuf.SecurityMode =
 633                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 634         else
 635                 vneg_inbuf.SecurityMode = 0;
 636
 637         vneg_inbuf.DialectCount = cpu_to_le16(1);
 638         vneg_inbuf.Dialects[0] =
 639                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 640
 641         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 642                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 643                 false /* use_ipc */,
 644                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 645                 (char **)&pneg_rsp, &rsplen);
 646
 647         if (rc != 0) {
 648                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 649                 return -EIO;
 650         }
 651
 652         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 653                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 654                          rsplen);
 655
 656                 /* relax check since Mac returns max bufsize allowed on ioctl */
 657                 if (rsplen > CIFSMaxBufSize)
 658                         return -EIO;
 659         }
 660
 661         /* check validate negotiate info response matches what we got earlier */
 662         if (pneg_rsp->Dialect !=
 663                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 664                 goto vneg_out;
 665
 666         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 667                 goto vneg_out;
 668
 669         /* do not validate server guid because not saved at negprot time yet */
 670
 671         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 672               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 673                 goto vneg_out;
 674
 675         /* validate negotiate successful */
 676         cifs_dbg(FYI, "validate negotiate info successful\n");
 677         return 0;
 678
 679 vneg_out:
 680         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 681         return -EIO;
 682 }
 683
 684 enum securityEnum
 685 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 686 {
 687         switch (requested) {
 688         case Kerberos:
 689         case RawNTLMSSP:
 690                 return requested;
 691         case NTLMv2:
 692                 return RawNTLMSSP;
 693         case Unspecified:
 694                 if (server->sec_ntlmssp &&
 695                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 696                         return RawNTLMSSP;
 697                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 698                         (global_secflags & CIFSSEC_MAY_KRB5))
 699                         return Kerberos;
 700                 /* Fallthrough */
 701         default:
 702                 return Unspecified;
 703         }
 704 }
 705
 706 struct SMB2_sess_data {
 707         unsigned int xid;
 708         struct cifs_ses *ses;
 709         struct nls_table *nls_cp;
 710         void (*func)(struct SMB2_sess_data *);
 711         int result;
 712         u64 previous_session;
 713
 714         /* we will send the SMB in three pieces:
 715          * a fixed length beginning part, an optional
 716          * SPNEGO blob (which can be zero length), and a
 717          * last part which will include the strings
 718          * and rest of bcc area. This allows us to avoid
 719          * a large buffer 17K allocation
 720          */
 721         int buf0_type;
 722         struct kvec iov[2];
 723 };
 724
 725 static int
 726 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 727 {
 728         int rc;
 729         struct cifs_ses *ses = sess_data->ses;
 730         struct smb2_sess_setup_req *req;
 731         struct TCP_Server_Info *server = ses->server;
 732
 733         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 734         if (rc)
 735                 return rc;
 736
 737         /* First session, not a reauthenticate */
 738         req->hdr.sync_hdr.SessionId = 0;
 739
 740         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 741         req->PreviousSessionId = sess_data->previous_session;
 742
 743         req->Flags = 0; /* MBZ */
 744         /* to enable echos and oplocks */
 745         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(3);
 746
 747         /* only one of SMB2 signing flags may be set in SMB2 request */
 748         if (server->sign)
 749                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 750         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 751                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 752         else
 753                 req->SecurityMode = 0;
 754
 755         req->Capabilities = 0;
 756         req->Channel = 0; /* MBZ */
 757
 758         sess_data->iov[0].iov_base = (char *)req;
 759         /* 4 for rfc1002 length field and 1 for pad */
 760         sess_data->iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 761         /*
 762          * This variable will be used to clear the buffer
 763          * allocated above in case of any error in the calling function.
 764          */
 765         sess_data->buf0_type = CIFS_SMALL_BUFFER;
 766
 767         return 0;
 768 }
 769
 770 static void
 771 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
 772 {
 773         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
 774         sess_data->buf0_type = CIFS_NO_BUFFER;
 775 }
 776
 777 static int
 778 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
 779 {
 780         int rc;
 781         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
 782         struct kvec rsp_iov = { NULL, 0 };
 783
 784         /* Testing shows that buffer offset must be at location of Buffer[0] */
 785         req->SecurityBufferOffset =
 786                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 787                         1 /* pad */ - 4 /* rfc1001 len */);
 788         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
 789
 790         inc_rfc1001_len(req, sess_data->iov[1].iov_len - 1 /* pad */);
 791
 792         /* BB add code to build os and lm fields */
 793
 794         rc = SendReceive2(sess_data->xid, sess_data->ses,
 795                                 sess_data->iov, 2,
 796                                 &sess_data->buf0_type,
 797                                 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
 798         cifs_small_buf_release(sess_data->iov[0].iov_base);
 799         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
 800
 801         return rc;
 802 }
 803
 804 static int
 805 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
 806 {
 807         int rc = 0;
 808         struct cifs_ses *ses = sess_data->ses;
 809
 810         mutex_lock(&ses->server->srv_mutex);
 811         if (ses->server->ops->generate_signingkey) {
 812                 rc = ses->server->ops->generate_signingkey(ses);
 813                 if (rc) {
 814                         cifs_dbg(FYI,
 815                                 "SMB3 session key generation failed\n");
 816                         mutex_unlock(&ses->server->srv_mutex);
 817                         return rc;
 818                 }
 819         }
 820         if (!ses->server->session_estab) {
 821                 ses->server->sequence_number = 0x2;
 822                 ses->server->session_estab = true;
 823         }
 824         mutex_unlock(&ses->server->srv_mutex);
 825
 826         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 827         spin_lock(&GlobalMid_Lock);
 828         ses->status = CifsGood;
 829         ses->need_reconnect = false;
 830         spin_unlock(&GlobalMid_Lock);
 831         return rc;
 832 }
 833
 834 #ifdef CONFIG_CIFS_UPCALL
 835 static void
 836 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
 837 {
 838         int rc;
 839         struct cifs_ses *ses = sess_data->ses;
 840         struct cifs_spnego_msg *msg;
 841         struct key *spnego_key = NULL;
 842         struct smb2_sess_setup_rsp *rsp = NULL;
 843
 844         rc = SMB2_sess_alloc_buffer(sess_data);
 845         if (rc)
 846                 goto out;
 847
 848         spnego_key = cifs_get_spnego_key(ses);
 849         if (IS_ERR(spnego_key)) {
 850                 rc = PTR_ERR(spnego_key);
 851                 spnego_key = NULL;
 852                 goto out;
 853         }
 854
 855         msg = spnego_key->payload.data[0];
 856         /*
 857          * check version field to make sure that cifs.upcall is
 858          * sending us a response in an expected form
 859          */
 860         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
 861                 cifs_dbg(VFS,
 862                           "bad cifs.upcall version. Expected %d got %d",
 863                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
 864                 rc = -EKEYREJECTED;
 865                 goto out_put_spnego_key;
 866         }
 867
 868         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
 869                                          GFP_KERNEL);
 870         if (!ses->auth_key.response) {
 871                 cifs_dbg(VFS,
 872                         "Kerberos can't allocate (%u bytes) memory",
 873                         msg->sesskey_len);
 874                 rc = -ENOMEM;
 875                 goto out_put_spnego_key;
 876         }
 877         ses->auth_key.len = msg->sesskey_len;
 878
 879         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
 880         sess_data->iov[1].iov_len = msg->secblob_len;
 881
 882         rc = SMB2_sess_sendreceive(sess_data);
 883         if (rc)
 884                 goto out_put_spnego_key;
 885
 886         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
 887         ses->Suid = rsp->hdr.sync_hdr.SessionId;
 888
 889         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 890
 891         rc = SMB2_sess_establish_session(sess_data);
 892 out_put_spnego_key:
 893         key_invalidate(spnego_key);
 894         key_put(spnego_key);
 895 out:
 896         sess_data->result = rc;
 897         sess_data->func = NULL;
 898         SMB2_sess_free_buffer(sess_data);
 899 }
 900 #else
 901 static void
 902 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
 903 {
 904         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
 905         sess_data->result = -EOPNOTSUPP;
 906         sess_data->func = NULL;
 907 }
 908 #endif
 909
 910 static void
 911 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
 912
 913 static void
 914 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
 915 {
 916         int rc;
 917         struct cifs_ses *ses = sess_data->ses;
 918         struct smb2_sess_setup_rsp *rsp = NULL;
 919         char *ntlmssp_blob = NULL;
 920         bool use_spnego = false; /* else use raw ntlmssp */
 921         u16 blob_length = 0;
 922
 923         /*
 924          * If memory allocation is successful, caller of this function
 925          * frees it.
 926          */
 927         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 928         if (!ses->ntlmssp) {
 929                 rc = -ENOMEM;
 930                 goto out_err;
 931         }
 932         ses->ntlmssp->sesskey_per_smbsess = true;
 933
 934         rc = SMB2_sess_alloc_buffer(sess_data);
 935         if (rc)
 936                 goto out_err;
 937
 938         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 939                                GFP_KERNEL);
 940         if (ntlmssp_blob == NULL) {
 941                 rc = -ENOMEM;
 942                 goto out;
 943         }
 944
 945         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 946         if (use_spnego) {
 947                 /* BB eventually need to add this */
 948                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 949                 rc = -EOPNOTSUPP;
 950                 goto out;
 951         } else {
 952                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 953                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 954         }
 955         sess_data->iov[1].iov_base = ntlmssp_blob;
 956         sess_data->iov[1].iov_len = blob_length;
 957
 958         rc = SMB2_sess_sendreceive(sess_data);
 959         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
 960
 961         /* If true, rc here is expected and not an error */
 962         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
 963                 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
 964                 rc = 0;
 965
 966         if (rc)
 967                 goto out;
 968
 969         if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 970                         le16_to_cpu(rsp->SecurityBufferOffset)) {
 971                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 972                         le16_to_cpu(rsp->SecurityBufferOffset));
 973                 rc = -EIO;
 974                 goto out;
 975         }
 976         rc = decode_ntlmssp_challenge(rsp->Buffer,
 977                         le16_to_cpu(rsp->SecurityBufferLength), ses);
 978         if (rc)
 979                 goto out;
 980
 981         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
 982
 983
 984         ses->Suid = rsp->hdr.sync_hdr.SessionId;
 985         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 986
 987 out:
 988         kfree(ntlmssp_blob);
 989         SMB2_sess_free_buffer(sess_data);
 990         if (!rc) {
 991                 sess_data->result = 0;
 992                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
 993                 return;
 994         }
 995 out_err:
 996         kfree(ses->ntlmssp);
 997         ses->ntlmssp = NULL;
 998         sess_data->result = rc;
 999         sess_data->func = NULL;
1000 }
1001
1002 static void
1003 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1004 {
1005         int rc;
1006         struct cifs_ses *ses = sess_data->ses;
1007         struct smb2_sess_setup_req *req;
1008         struct smb2_sess_setup_rsp *rsp = NULL;
1009         unsigned char *ntlmssp_blob = NULL;
1010         bool use_spnego = false; /* else use raw ntlmssp */
1011         u16 blob_length = 0;
1012
1013         rc = SMB2_sess_alloc_buffer(sess_data);
1014         if (rc)
1015                 goto out;
1016
1017         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1018         req->hdr.sync_hdr.SessionId = ses->Suid;
1019
1020         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1021                                         sess_data->nls_cp);
1022         if (rc) {
1023                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1024                 goto out;
1025         }
1026
1027         if (use_spnego) {
1028                 /* BB eventually need to add this */
1029                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1030                 rc = -EOPNOTSUPP;
1031                 goto out;
1032         }
1033         sess_data->iov[1].iov_base = ntlmssp_blob;
1034         sess_data->iov[1].iov_len = blob_length;
1035
1036         rc = SMB2_sess_sendreceive(sess_data);
1037         if (rc)
1038                 goto out;
1039
1040         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1041
1042         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1043         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1044
1045         rc = SMB2_sess_establish_session(sess_data);
1046 out:
1047         kfree(ntlmssp_blob);
1048         SMB2_sess_free_buffer(sess_data);
1049         kfree(ses->ntlmssp);
1050         ses->ntlmssp = NULL;
1051         sess_data->result = rc;
1052         sess_data->func = NULL;
1053 }
1054
1055 static int
1056 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1057 {
1058         int type;
1059
1060         type = smb2_select_sectype(ses->server, ses->sectype);
1061         cifs_dbg(FYI, "sess setup type %d\n", type);
1062         if (type == Unspecified) {
1063                 cifs_dbg(VFS,
1064                         "Unable to select appropriate authentication method!");
1065                 return -EINVAL;
1066         }
1067
1068         switch (type) {
1069         case Kerberos:
1070                 sess_data->func = SMB2_auth_kerberos;
1071                 break;
1072         case RawNTLMSSP:
1073                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1074                 break;
1075         default:
1076                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1077                 return -EOPNOTSUPP;
1078         }
1079
1080         return 0;
1081 }
1082
1083 int
1084 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1085                 const struct nls_table *nls_cp)
1086 {
1087         int rc = 0;
1088         struct TCP_Server_Info *server = ses->server;
1089         struct SMB2_sess_data *sess_data;
1090
1091         cifs_dbg(FYI, "Session Setup\n");
1092
1093         if (!server) {
1094                 WARN(1, "%s: server is NULL!\n", __func__);
1095                 return -EIO;
1096         }
1097
1098         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1099         if (!sess_data)
1100                 return -ENOMEM;
1101
1102         rc = SMB2_select_sec(ses, sess_data);
1103         if (rc)
1104                 goto out;
1105         sess_data->xid = xid;
1106         sess_data->ses = ses;
1107         sess_data->buf0_type = CIFS_NO_BUFFER;
1108         sess_data->nls_cp = (struct nls_table *) nls_cp;
1109
1110         while (sess_data->func)
1111                 sess_data->func(sess_data);
1112
1113         rc = sess_data->result;
1114 out:
1115         kfree(sess_data);
1116         return rc;
1117 }
1118
1119 int
1120 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1121 {
1122         struct smb2_logoff_req *req; /* response is also trivial struct */
1123         int rc = 0;
1124         struct TCP_Server_Info *server;
1125         int flags = 0;
1126
1127         cifs_dbg(FYI, "disconnect session %p\n", ses);
1128
1129         if (ses && (ses->server))
1130                 server = ses->server;
1131         else
1132                 return -EIO;
1133
1134         /* no need to send SMB logoff if uid already closed due to reconnect */
1135         if (ses->need_reconnect)
1136                 goto smb2_session_already_dead;
1137
1138         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
1139         if (rc)
1140                 return rc;
1141
1142          /* since no tcon, smb2_init can not do this, so do here */
1143         req->hdr.sync_hdr.SessionId = ses->Suid;
1144
1145         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1146                 flags |= CIFS_TRANSFORM_REQ;
1147         else if (server->sign)
1148                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1149
1150         rc = SendReceiveNoRsp(xid, ses, (char *) req, flags);
1151         cifs_small_buf_release(req);
1152         /*
1153          * No tcon so can't do
1154          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1155          */
1156
1157 smb2_session_already_dead:
1158         return rc;
1159 }
1160
1161 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1162 {
1163         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1164 }
1165
1166 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1167
1168 /* These are similar values to what Windows uses */
1169 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1170 {
1171         tcon->max_chunks = 256;
1172         tcon->max_bytes_chunk = 1048576;
1173         tcon->max_bytes_copy = 16777216;
1174 }
1175
1176 int
1177 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1178           struct cifs_tcon *tcon, const struct nls_table *cp)
1179 {
1180         struct smb2_tree_connect_req *req;
1181         struct smb2_tree_connect_rsp *rsp = NULL;
1182         struct kvec iov[2];
1183         struct kvec rsp_iov;
1184         int rc = 0;
1185         int resp_buftype;
1186         int unc_path_len;
1187         __le16 *unc_path = NULL;
1188         int flags = 0;
1189
1190         cifs_dbg(FYI, "TCON\n");
1191
1192         if (!(ses->server) || !tree)
1193                 return -EIO;
1194
1195         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1196         if (unc_path == NULL)
1197                 return -ENOMEM;
1198
1199         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1200         unc_path_len *= 2;
1201         if (unc_path_len < 2) {
1202                 kfree(unc_path);
1203                 return -EINVAL;
1204         }
1205
1206         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1207         if (tcon)
1208                 tcon->tid = 0;
1209
1210         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
1211         if (rc) {
1212                 kfree(unc_path);
1213                 return rc;
1214         }
1215
1216         if (tcon == NULL) {
1217                 if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
1218                         flags |= CIFS_TRANSFORM_REQ;
1219
1220                 /* since no tcon, smb2_init can not do this, so do here */
1221                 req->hdr.sync_hdr.SessionId = ses->Suid;
1222                 if (ses->server->sign)
1223                         req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1224         } else if (encryption_required(tcon))
1225                 flags |= CIFS_TRANSFORM_REQ;
1226
1227         iov[0].iov_base = (char *)req;
1228         /* 4 for rfc1002 length field and 1 for pad */
1229         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1230
1231         /* Testing shows that buffer offset must be at location of Buffer[0] */
1232         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1233                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
1234         req->PathLength = cpu_to_le16(unc_path_len - 2);
1235         iov[1].iov_base = unc_path;
1236         iov[1].iov_len = unc_path_len;
1237
1238         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
1239
1240         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1241         cifs_small_buf_release(req);
1242         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1243
1244         if (rc != 0) {
1245                 if (tcon) {
1246                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1247                         tcon->need_reconnect = true;
1248                 }
1249                 goto tcon_error_exit;
1250         }
1251
1252         if (tcon == NULL) {
1253                 ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1254                 goto tcon_exit;
1255         }
1256
1257         switch (rsp->ShareType) {
1258         case SMB2_SHARE_TYPE_DISK:
1259                 cifs_dbg(FYI, "connection to disk share\n");
1260                 break;
1261         case SMB2_SHARE_TYPE_PIPE:
1262                 tcon->ipc = true;
1263                 cifs_dbg(FYI, "connection to pipe share\n");
1264                 break;
1265         case SMB2_SHARE_TYPE_PRINT:
1266                 tcon->ipc = true;
1267                 cifs_dbg(FYI, "connection to printer\n");
1268                 break;
1269         default:
1270                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1271                 rc = -EOPNOTSUPP;
1272                 goto tcon_error_exit;
1273         }
1274
1275         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1276         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1277         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1278         tcon->tidStatus = CifsGood;
1279         tcon->need_reconnect = false;
1280         tcon->tid = rsp->hdr.sync_hdr.TreeId;
1281         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1282
1283         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1284             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1285                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1286
1287         if (tcon->seal &&
1288             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1289                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1290
1291         init_copy_chunk_defaults(tcon);
1292         if (tcon->ses->server->ops->validate_negotiate)
1293                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1294 tcon_exit:
1295         free_rsp_buf(resp_buftype, rsp);
1296         kfree(unc_path);
1297         return rc;
1298
1299 tcon_error_exit:
1300         if (rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1301                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1302         }
1303         goto tcon_exit;
1304 }
1305
1306 int
1307 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1308 {
1309         struct smb2_tree_disconnect_req *req; /* response is trivial */
1310         int rc = 0;
1311         struct cifs_ses *ses = tcon->ses;
1312         int flags = 0;
1313
1314         cifs_dbg(FYI, "Tree Disconnect\n");
1315
1316         if (!ses || !(ses->server))
1317                 return -EIO;
1318
1319         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1320                 return 0;
1321
1322         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1323         if (rc)
1324                 return rc;
1325
1326         if (encryption_required(tcon))
1327                 flags |= CIFS_TRANSFORM_REQ;
1328
1329         rc = SendReceiveNoRsp(xid, ses, (char *)req, flags);
1330         cifs_small_buf_release(req);
1331         if (rc)
1332                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1333
1334         return rc;
1335 }
1336
1337
1338 static struct create_durable *
1339 create_durable_buf(void)
1340 {
1341         struct create_durable *buf;
1342
1343         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1344         if (!buf)
1345                 return NULL;
1346
1347         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1348                                         (struct create_durable, Data));
1349         buf->ccontext.DataLength = cpu_to_le32(16);
1350         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1351                                 (struct create_durable, Name));
1352         buf->ccontext.NameLength = cpu_to_le16(4);
1353         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1354         buf->Name[0] = 'D';
1355         buf->Name[1] = 'H';
1356         buf->Name[2] = 'n';
1357         buf->Name[3] = 'Q';
1358         return buf;
1359 }
1360
1361 static struct create_durable *
1362 create_reconnect_durable_buf(struct cifs_fid *fid)
1363 {
1364         struct create_durable *buf;
1365
1366         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1367         if (!buf)
1368                 return NULL;
1369
1370         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1371                                         (struct create_durable, Data));
1372         buf->ccontext.DataLength = cpu_to_le32(16);
1373         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1374                                 (struct create_durable, Name));
1375         buf->ccontext.NameLength = cpu_to_le16(4);
1376         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1377         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1378         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1379         buf->Name[0] = 'D';
1380         buf->Name[1] = 'H';
1381         buf->Name[2] = 'n';
1382         buf->Name[3] = 'C';
1383         return buf;
1384 }
1385
1386 static __u8
1387 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1388                   unsigned int *epoch)
1389 {
1390         char *data_offset;
1391         struct create_context *cc;
1392         unsigned int next;
1393         unsigned int remaining;
1394         char *name;
1395
1396         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1397         remaining = le32_to_cpu(rsp->CreateContextsLength);
1398         cc = (struct create_context *)data_offset;
1399         while (remaining >= sizeof(struct create_context)) {
1400                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1401                 if (le16_to_cpu(cc->NameLength) == 4 &&
1402                     strncmp(name, "RqLs", 4) == 0)
1403                         return server->ops->parse_lease_buf(cc, epoch);
1404
1405                 next = le32_to_cpu(cc->Next);
1406                 if (!next)
1407                         break;
1408                 remaining -= next;
1409                 cc = (struct create_context *)((char *)cc + next);
1410         }
1411
1412         return 0;
1413 }
1414
1415 static int
1416 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1417                   unsigned int *num_iovec, __u8 *oplock)
1418 {
1419         struct smb2_create_req *req = iov[0].iov_base;
1420         unsigned int num = *num_iovec;
1421
1422         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1423         if (iov[num].iov_base == NULL)
1424                 return -ENOMEM;
1425         iov[num].iov_len = server->vals->create_lease_size;
1426         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1427         if (!req->CreateContextsOffset)
1428                 req->CreateContextsOffset = cpu_to_le32(
1429                                 sizeof(struct smb2_create_req) - 4 +
1430                                 iov[num - 1].iov_len);
1431         le32_add_cpu(&req->CreateContextsLength,
1432                      server->vals->create_lease_size);
1433         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1434         *num_iovec = num + 1;
1435         return 0;
1436 }
1437
1438 static struct create_durable_v2 *
1439 create_durable_v2_buf(struct cifs_fid *pfid)
1440 {
1441         struct create_durable_v2 *buf;
1442
1443         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1444         if (!buf)
1445                 return NULL;
1446
1447         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1448                                         (struct create_durable_v2, dcontext));
1449         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1450         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1451                                 (struct create_durable_v2, Name));
1452         buf->ccontext.NameLength = cpu_to_le16(4);
1453
1454         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1455         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1456         generate_random_uuid(buf->dcontext.CreateGuid);
1457         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1458
1459         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1460         buf->Name[0] = 'D';
1461         buf->Name[1] = 'H';
1462         buf->Name[2] = '2';
1463         buf->Name[3] = 'Q';
1464         return buf;
1465 }
1466
1467 static struct create_durable_handle_reconnect_v2 *
1468 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1469 {
1470         struct create_durable_handle_reconnect_v2 *buf;
1471
1472         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1473                         GFP_KERNEL);
1474         if (!buf)
1475                 return NULL;
1476
1477         buf->ccontext.DataOffset =
1478                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1479                                      dcontext));
1480         buf->ccontext.DataLength =
1481                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1482         buf->ccontext.NameOffset =
1483                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1484                             Name));
1485         buf->ccontext.NameLength = cpu_to_le16(4);
1486
1487         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1488         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1489         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1490         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1491
1492         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1493         buf->Name[0] = 'D';
1494         buf->Name[1] = 'H';
1495         buf->Name[2] = '2';
1496         buf->Name[3] = 'C';
1497         return buf;
1498 }
1499
1500 static int
1501 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1502                     struct cifs_open_parms *oparms)
1503 {
1504         struct smb2_create_req *req = iov[0].iov_base;
1505         unsigned int num = *num_iovec;
1506
1507         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1508         if (iov[num].iov_base == NULL)
1509                 return -ENOMEM;
1510         iov[num].iov_len = sizeof(struct create_durable_v2);
1511         if (!req->CreateContextsOffset)
1512                 req->CreateContextsOffset =
1513                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1514                                                                 iov[1].iov_len);
1515         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1516         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1517         *num_iovec = num + 1;
1518         return 0;
1519 }
1520
1521 static int
1522 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1523                     struct cifs_open_parms *oparms)
1524 {
1525         struct smb2_create_req *req = iov[0].iov_base;
1526         unsigned int num = *num_iovec;
1527
1528         /* indicate that we don't need to relock the file */
1529         oparms->reconnect = false;
1530
1531         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1532         if (iov[num].iov_base == NULL)
1533                 return -ENOMEM;
1534         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1535         if (!req->CreateContextsOffset)
1536                 req->CreateContextsOffset =
1537                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1538                                                                 iov[1].iov_len);
1539         le32_add_cpu(&req->CreateContextsLength,
1540                         sizeof(struct create_durable_handle_reconnect_v2));
1541         inc_rfc1001_len(&req->hdr,
1542                         sizeof(struct create_durable_handle_reconnect_v2));
1543         *num_iovec = num + 1;
1544         return 0;
1545 }
1546
1547 static int
1548 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1549                     struct cifs_open_parms *oparms, bool use_persistent)
1550 {
1551         struct smb2_create_req *req = iov[0].iov_base;
1552         unsigned int num = *num_iovec;
1553
1554         if (use_persistent) {
1555                 if (oparms->reconnect)
1556                         return add_durable_reconnect_v2_context(iov, num_iovec,
1557                                                                 oparms);
1558                 else
1559                         return add_durable_v2_context(iov, num_iovec, oparms);
1560         }
1561
1562         if (oparms->reconnect) {
1563                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1564                 /* indicate that we don't need to relock the file */
1565                 oparms->reconnect = false;
1566         } else
1567                 iov[num].iov_base = create_durable_buf();
1568         if (iov[num].iov_base == NULL)
1569                 return -ENOMEM;
1570         iov[num].iov_len = sizeof(struct create_durable);
1571         if (!req->CreateContextsOffset)
1572                 req->CreateContextsOffset =
1573                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1574                                                                 iov[1].iov_len);
1575         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1576         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1577         *num_iovec = num + 1;
1578         return 0;
1579 }
1580
1581 static int
1582 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1583                             const char *treename, const __le16 *path)
1584 {
1585         int treename_len, path_len;
1586         struct nls_table *cp;
1587         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1588
1589         /*
1590          * skip leading "\\"
1591          */
1592         treename_len = strlen(treename);
1593         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1594                 return -EINVAL;
1595
1596         treename += 2;
1597         treename_len -= 2;
1598
1599         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1600
1601         /*
1602          * make room for one path separator between the treename and
1603          * path
1604          */
1605         *out_len = treename_len + 1 + path_len;
1606
1607         /*
1608          * final path needs to be null-terminated UTF16 with a
1609          * size aligned to 8
1610          */
1611
1612         *out_size = roundup((*out_len+1)*2, 8);
1613         *out_path = kzalloc(*out_size, GFP_KERNEL);
1614         if (!*out_path)
1615                 return -ENOMEM;
1616
1617         cp = load_nls_default();
1618         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1619         UniStrcat(*out_path, sep);
1620         UniStrcat(*out_path, path);
1621         unload_nls(cp);
1622
1623         return 0;
1624 }
1625
1626 int
1627 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1628           __u8 *oplock, struct smb2_file_all_info *buf,
1629           struct smb2_err_rsp **err_buf)
1630 {
1631         struct smb2_create_req *req;
1632         struct smb2_create_rsp *rsp;
1633         struct TCP_Server_Info *server;
1634         struct cifs_tcon *tcon = oparms->tcon;
1635         struct cifs_ses *ses = tcon->ses;
1636         struct kvec iov[4];
1637         struct kvec rsp_iov;
1638         int resp_buftype;
1639         int uni_path_len;
1640         __le16 *copy_path = NULL;
1641         int copy_size;
1642         int rc = 0;
1643         unsigned int n_iov = 2;
1644         __u32 file_attributes = 0;
1645         char *dhc_buf = NULL, *lc_buf = NULL;
1646         int flags = 0;
1647
1648         cifs_dbg(FYI, "create/open\n");
1649
1650         if (ses && (ses->server))
1651                 server = ses->server;
1652         else
1653                 return -EIO;
1654
1655         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1656         if (rc)
1657                 return rc;
1658
1659         if (encryption_required(tcon))
1660                 flags |= CIFS_TRANSFORM_REQ;
1661
1662         if (oparms->create_options & CREATE_OPTION_READONLY)
1663                 file_attributes |= ATTR_READONLY;
1664         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1665                 file_attributes |= ATTR_SYSTEM;
1666
1667         req->ImpersonationLevel = IL_IMPERSONATION;
1668         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1669         /* File attributes ignored on open (used in create though) */
1670         req->FileAttributes = cpu_to_le32(file_attributes);
1671         req->ShareAccess = FILE_SHARE_ALL_LE;
1672         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1673         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1674
1675         iov[0].iov_base = (char *)req;
1676         /* 4 for rfc1002 length field */
1677         iov[0].iov_len = get_rfc1002_length(req) + 4;
1678         /* -1 since last byte is buf[0] which is sent below (path) */
1679         iov[0].iov_len--;
1680
1681         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1682
1683         /* [MS-SMB2] 2.2.13 NameOffset:
1684          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1685          * the SMB2 header, the file name includes a prefix that will
1686          * be processed during DFS name normalization as specified in
1687          * section 3.3.5.9. Otherwise, the file name is relative to
1688          * the share that is identified by the TreeId in the SMB2
1689          * header.
1690          */
1691         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1692                 int name_len;
1693
1694                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1695                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1696                                                  &name_len,
1697                                                  tcon->treeName, path);
1698                 if (rc)
1699                         return rc;
1700                 req->NameLength = cpu_to_le16(name_len * 2);
1701                 uni_path_len = copy_size;
1702                 path = copy_path;
1703         } else {
1704                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1705                 /* MUST set path len (NameLength) to 0 opening root of share */
1706                 req->NameLength = cpu_to_le16(uni_path_len - 2);
1707                 if (uni_path_len % 8 != 0) {
1708                         copy_size = roundup(uni_path_len, 8);
1709                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1710                         if (!copy_path)
1711                                 return -ENOMEM;
1712                         memcpy((char *)copy_path, (const char *)path,
1713                                uni_path_len);
1714                         uni_path_len = copy_size;
1715                         path = copy_path;
1716                 }
1717         }
1718
1719         iov[1].iov_len = uni_path_len;
1720         iov[1].iov_base = path;
1721         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1722         inc_rfc1001_len(req, uni_path_len - 1);
1723
1724         if (!server->oplocks)
1725                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1726
1727         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1728             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1729                 req->RequestedOplockLevel = *oplock;
1730         else {
1731                 rc = add_lease_context(server, iov, &n_iov, oplock);
1732                 if (rc) {
1733                         cifs_small_buf_release(req);
1734                         kfree(copy_path);
1735                         return rc;
1736                 }
1737                 lc_buf = iov[n_iov-1].iov_base;
1738         }
1739
1740         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1741                 /* need to set Next field of lease context if we request it */
1742                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1743                         struct create_context *ccontext =
1744                             (struct create_context *)iov[n_iov-1].iov_base;
1745                         ccontext->Next =
1746                                 cpu_to_le32(server->vals->create_lease_size);
1747                 }
1748
1749                 rc = add_durable_context(iov, &n_iov, oparms,
1750                                         tcon->use_persistent);
1751                 if (rc) {
1752                         cifs_small_buf_release(req);
1753                         kfree(copy_path);
1754                         kfree(lc_buf);
1755                         return rc;
1756                 }
1757                 dhc_buf = iov[n_iov-1].iov_base;
1758         }
1759
1760         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1761         cifs_small_buf_release(req);
1762         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1763
1764         if (rc != 0) {
1765                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1766                 if (err_buf)
1767                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1768                                            GFP_KERNEL);
1769                 goto creat_exit;
1770         }
1771
1772         oparms->fid->persistent_fid = rsp->PersistentFileId;
1773         oparms->fid->volatile_fid = rsp->VolatileFileId;
1774
1775         if (buf) {
1776                 memcpy(buf, &rsp->CreationTime, 32);
1777                 buf->AllocationSize = rsp->AllocationSize;
1778                 buf->EndOfFile = rsp->EndofFile;
1779                 buf->Attributes = rsp->FileAttributes;
1780                 buf->NumberOfLinks = cpu_to_le32(1);
1781                 buf->DeletePending = 0;
1782         }
1783
1784         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1785                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1786         else
1787                 *oplock = rsp->OplockLevel;
1788 creat_exit:
1789         kfree(copy_path);
1790         kfree(lc_buf);
1791         kfree(dhc_buf);
1792         free_rsp_buf(resp_buftype, rsp);
1793         return rc;
1794 }
1795
1796 /*
1797  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1798  */
1799 int
1800 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1801            u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
1802            char *in_data, u32 indatalen,
1803            char **out_data, u32 *plen /* returned data len */)
1804 {
1805         struct smb2_ioctl_req *req;
1806         struct smb2_ioctl_rsp *rsp;
1807         struct smb2_sync_hdr *shdr;
1808         struct cifs_ses *ses;
1809         struct kvec iov[2];
1810         struct kvec rsp_iov;
1811         int resp_buftype;
1812         int n_iov;
1813         int rc = 0;
1814         int flags = 0;
1815
1816         cifs_dbg(FYI, "SMB2 IOCTL\n");
1817
1818         if (out_data != NULL)
1819                 *out_data = NULL;
1820
1821         /* zero out returned data len, in case of error */
1822         if (plen)
1823                 *plen = 0;
1824
1825         if (tcon)
1826                 ses = tcon->ses;
1827         else
1828                 return -EIO;
1829
1830         if (!ses || !(ses->server))
1831                 return -EIO;
1832
1833         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1834         if (rc)
1835                 return rc;
1836
1837         if (use_ipc) {
1838                 if (ses->ipc_tid == 0) {
1839                         cifs_small_buf_release(req);
1840                         return -ENOTCONN;
1841                 }
1842
1843                 cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n",
1844                          req->hdr.sync_hdr.TreeId, ses->ipc_tid);
1845                 req->hdr.sync_hdr.TreeId = ses->ipc_tid;
1846         }
1847         if (encryption_required(tcon))
1848                 flags |= CIFS_TRANSFORM_REQ;
1849
1850         req->CtlCode = cpu_to_le32(opcode);
1851         req->PersistentFileId = persistent_fid;
1852         req->VolatileFileId = volatile_fid;
1853
1854         if (indatalen) {
1855                 req->InputCount = cpu_to_le32(indatalen);
1856                 /* do not set InputOffset if no input data */
1857                 req->InputOffset =
1858                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1859                 iov[1].iov_base = in_data;
1860                 iov[1].iov_len = indatalen;
1861                 n_iov = 2;
1862         } else
1863                 n_iov = 1;
1864
1865         req->OutputOffset = 0;
1866         req->OutputCount = 0; /* MBZ */
1867
1868         /*
1869          * Could increase MaxOutputResponse, but that would require more
1870          * than one credit. Windows typically sets this smaller, but for some
1871          * ioctls it may be useful to allow server to send more. No point
1872          * limiting what the server can send as long as fits in one credit
1873          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
1874          * (by default, note that it can be overridden to make max larger)
1875          * in responses (except for read responses which can be bigger.
1876          * We may want to bump this limit up
1877          */
1878         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
1879
1880         if (is_fsctl)
1881                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1882         else
1883                 req->Flags = 0;
1884
1885         iov[0].iov_base = (char *)req;
1886
1887         /*
1888          * If no input data, the size of ioctl struct in
1889          * protocol spec still includes a 1 byte data buffer,
1890          * but if input data passed to ioctl, we do not
1891          * want to double count this, so we do not send
1892          * the dummy one byte of data in iovec[0] if sending
1893          * input data (in iovec[1]). We also must add 4 bytes
1894          * in first iovec to allow for rfc1002 length field.
1895          */
1896
1897         if (indatalen) {
1898                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1899                 inc_rfc1001_len(req, indatalen - 1);
1900         } else
1901                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1902
1903
1904         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1905         cifs_small_buf_release(req);
1906         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1907
1908         if ((rc != 0) && (rc != -EINVAL)) {
1909                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1910                 goto ioctl_exit;
1911         } else if (rc == -EINVAL) {
1912                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1913                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1914                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1915                         goto ioctl_exit;
1916                 }
1917         }
1918
1919         /* check if caller wants to look at return data or just return rc */
1920         if ((plen == NULL) || (out_data == NULL))
1921                 goto ioctl_exit;
1922
1923         *plen = le32_to_cpu(rsp->OutputCount);
1924
1925         /* We check for obvious errors in the output buffer length and offset */
1926         if (*plen == 0)
1927                 goto ioctl_exit; /* server returned no data */
1928         else if (*plen > 0xFF00) {
1929                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1930                 *plen = 0;
1931                 rc = -EIO;
1932                 goto ioctl_exit;
1933         }
1934
1935         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1936                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1937                         le32_to_cpu(rsp->OutputOffset));
1938                 *plen = 0;
1939                 rc = -EIO;
1940                 goto ioctl_exit;
1941         }
1942
1943         *out_data = kmalloc(*plen, GFP_KERNEL);
1944         if (*out_data == NULL) {
1945                 rc = -ENOMEM;
1946                 goto ioctl_exit;
1947         }
1948
1949         shdr = get_sync_hdr(rsp);
1950         memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
1951 ioctl_exit:
1952         free_rsp_buf(resp_buftype, rsp);
1953         return rc;
1954 }
1955
1956 /*
1957  *   Individual callers to ioctl worker function follow
1958  */
1959
1960 int
1961 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1962                      u64 persistent_fid, u64 volatile_fid)
1963 {
1964         int rc;
1965         struct  compress_ioctl fsctl_input;
1966         char *ret_data = NULL;
1967
1968         fsctl_input.CompressionState =
1969                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1970
1971         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1972                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1973                         false /* use_ipc */,
1974                         (char *)&fsctl_input /* data input */,
1975                         2 /* in data len */, &ret_data /* out data */, NULL);
1976
1977         cifs_dbg(FYI, "set compression rc %d\n", rc);
1978
1979         return rc;
1980 }
1981
1982 int
1983 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1984            u64 persistent_fid, u64 volatile_fid)
1985 {
1986         struct smb2_close_req *req;
1987         struct smb2_close_rsp *rsp;
1988         struct cifs_ses *ses = tcon->ses;
1989         struct kvec iov[1];
1990         struct kvec rsp_iov;
1991         int resp_buftype;
1992         int rc = 0;
1993         int flags = 0;
1994
1995         cifs_dbg(FYI, "Close\n");
1996
1997         if (!ses || !(ses->server))
1998                 return -EIO;
1999
2000         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
2001         if (rc)
2002                 return rc;
2003
2004         if (encryption_required(tcon))
2005                 flags |= CIFS_TRANSFORM_REQ;
2006
2007         req->PersistentFileId = persistent_fid;
2008         req->VolatileFileId = volatile_fid;
2009
2010         iov[0].iov_base = (char *)req;
2011         /* 4 for rfc1002 length field */
2012         iov[0].iov_len = get_rfc1002_length(req) + 4;
2013
2014         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2015         cifs_small_buf_release(req);
2016         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2017
2018         if (rc != 0) {
2019                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2020                 goto close_exit;
2021         }
2022
2023         /* BB FIXME - decode close response, update inode for caching */
2024
2025 close_exit:
2026         free_rsp_buf(resp_buftype, rsp);
2027         return rc;
2028 }
2029
2030 static int
2031 validate_buf(unsigned int offset, unsigned int buffer_length,
2032              struct smb2_hdr *hdr, unsigned int min_buf_size)
2033
2034 {
2035         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
2036         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
2037         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2038         char *end_of_buf = begin_of_buf + buffer_length;
2039
2040
2041         if (buffer_length < min_buf_size) {
2042                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2043                          buffer_length, min_buf_size);
2044                 return -EINVAL;
2045         }
2046
2047         /* check if beyond RFC1001 maximum length */
2048         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2049                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2050                          buffer_length, smb_len);
2051                 return -EINVAL;
2052         }
2053
2054         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2055                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2056                 return -EINVAL;
2057         }
2058
2059         return 0;
2060 }
2061
2062 /*
2063  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2064  * Caller must free buffer.
2065  */
2066 static int
2067 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
2068                       struct smb2_hdr *hdr, unsigned int minbufsize,
2069                       char *data)
2070
2071 {
2072         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2073         int rc;
2074
2075         if (!data)
2076                 return -EINVAL;
2077
2078         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
2079         if (rc)
2080                 return rc;
2081
2082         memcpy(data, begin_of_buf, buffer_length);
2083
2084         return 0;
2085 }
2086
2087 static int
2088 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2089            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2090            u32 additional_info, size_t output_len, size_t min_len, void **data,
2091                 u32 *dlen)
2092 {
2093         struct smb2_query_info_req *req;
2094         struct smb2_query_info_rsp *rsp = NULL;
2095         struct kvec iov[2];
2096         struct kvec rsp_iov;
2097         int rc = 0;
2098         int resp_buftype;
2099         struct cifs_ses *ses = tcon->ses;
2100         int flags = 0;
2101
2102         cifs_dbg(FYI, "Query Info\n");
2103
2104         if (!ses || !(ses->server))
2105                 return -EIO;
2106
2107         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2108         if (rc)
2109                 return rc;
2110
2111         if (encryption_required(tcon))
2112                 flags |= CIFS_TRANSFORM_REQ;
2113
2114         req->InfoType = info_type;
2115         req->FileInfoClass = info_class;
2116         req->PersistentFileId = persistent_fid;
2117         req->VolatileFileId = volatile_fid;
2118         req->AdditionalInformation = cpu_to_le32(additional_info);
2119         /* 4 for rfc1002 length field and 1 for Buffer */
2120         req->InputBufferOffset =
2121                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2122         req->OutputBufferLength = cpu_to_le32(output_len);
2123
2124         iov[0].iov_base = (char *)req;
2125         /* 4 for rfc1002 length field */
2126         iov[0].iov_len = get_rfc1002_length(req) + 4;
2127
2128         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2129         cifs_small_buf_release(req);
2130         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2131
2132         if (rc) {
2133                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2134                 goto qinf_exit;
2135         }
2136
2137         if (dlen) {
2138                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2139                 if (!*data) {
2140                         *data = kmalloc(*dlen, GFP_KERNEL);
2141                         if (!*data) {
2142                                 cifs_dbg(VFS,
2143                                         "Error %d allocating memory for acl\n",
2144                                         rc);
2145                                 *dlen = 0;
2146                                 goto qinf_exit;
2147                         }
2148                 }
2149         }
2150
2151         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
2152                                    le32_to_cpu(rsp->OutputBufferLength),
2153                                    &rsp->hdr, min_len, *data);
2154
2155 qinf_exit:
2156         free_rsp_buf(resp_buftype, rsp);
2157         return rc;
2158 }
2159
2160 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2161         u64 persistent_fid, u64 volatile_fid,
2162         struct smb2_file_full_ea_info *data)
2163 {
2164         return query_info(xid, tcon, persistent_fid, volatile_fid,
2165                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2166                           SMB2_MAX_EA_BUF,
2167                           sizeof(struct smb2_file_full_ea_info),
2168                           (void **)&data,
2169                           NULL);
2170 }
2171
2172 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2173         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2174 {
2175         return query_info(xid, tcon, persistent_fid, volatile_fid,
2176                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2177                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2178                           sizeof(struct smb2_file_all_info), (void **)&data,
2179                           NULL);
2180 }
2181
2182 int
2183 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2184                 u64 persistent_fid, u64 volatile_fid,
2185                 void **data, u32 *plen)
2186 {
2187         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2188         *plen = 0;
2189
2190         return query_info(xid, tcon, persistent_fid, volatile_fid,
2191                           0, SMB2_O_INFO_SECURITY, additional_info,
2192                           SMB2_MAX_BUFFER_SIZE,
2193                           sizeof(struct smb2_file_all_info), data, plen);
2194 }
2195
2196 int
2197 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2198                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2199 {
2200         return query_info(xid, tcon, persistent_fid, volatile_fid,
2201                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2202                           sizeof(struct smb2_file_internal_info),
2203                           sizeof(struct smb2_file_internal_info),
2204                           (void **)&uniqueid, NULL);
2205 }
2206
2207 /*
2208  * This is a no-op for now. We're not really interested in the reply, but
2209  * rather in the fact that the server sent one and that server->lstrp
2210  * gets updated.
2211  *
2212  * FIXME: maybe we should consider checking that the reply matches request?
2213  */
2214 static void
2215 smb2_echo_callback(struct mid_q_entry *mid)
2216 {
2217         struct TCP_Server_Info *server = mid->callback_data;
2218         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2219         unsigned int credits_received = 1;
2220
2221         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2222                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2223
2224         DeleteMidQEntry(mid);
2225         add_credits(server, credits_received, CIFS_ECHO_OP);
2226 }
2227
2228 void smb2_reconnect_server(struct work_struct *work)
2229 {
2230         struct TCP_Server_Info *server = container_of(work,
2231                                         struct TCP_Server_Info, reconnect.work);
2232         struct cifs_ses *ses;
2233         struct cifs_tcon *tcon, *tcon2;
2234         struct list_head tmp_list;
2235         int tcon_exist = false;
2236         int rc;
2237         int resched = false;
2238
2239
2240         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2241         mutex_lock(&server->reconnect_mutex);
2242
2243         INIT_LIST_HEAD(&tmp_list);
2244         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2245
2246         spin_lock(&cifs_tcp_ses_lock);
2247         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2248                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2249                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2250                                 tcon->tc_count++;
2251                                 list_add_tail(&tcon->rlist, &tmp_list);
2252                                 tcon_exist = true;
2253                         }
2254                 }
2255         }
2256         /*
2257          * Get the reference to server struct to be sure that the last call of
2258          * cifs_put_tcon() in the loop below won't release the server pointer.
2259          */
2260         if (tcon_exist)
2261                 server->srv_count++;
2262
2263         spin_unlock(&cifs_tcp_ses_lock);
2264
2265         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2266                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2267                 if (!rc)
2268                         cifs_reopen_persistent_handles(tcon);
2269                 else
2270                         resched = true;
2271                 list_del_init(&tcon->rlist);
2272                 cifs_put_tcon(tcon);
2273         }
2274
2275         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2276         if (resched)
2277                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2278         mutex_unlock(&server->reconnect_mutex);
2279
2280         /* now we can safely release srv struct */
2281         if (tcon_exist)
2282                 cifs_put_tcp_session(server, 1);
2283 }
2284
2285 int
2286 SMB2_echo(struct TCP_Server_Info *server)
2287 {
2288         struct smb2_echo_req *req;
2289         int rc = 0;
2290         struct kvec iov[2];
2291         struct smb_rqst rqst = { .rq_iov = iov,
2292                                  .rq_nvec = 2 };
2293
2294         cifs_dbg(FYI, "In echo request\n");
2295
2296         if (server->tcpStatus == CifsNeedNegotiate) {
2297                 /* No need to send echo on newly established connections */
2298                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2299                 return rc;
2300         }
2301
2302         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
2303         if (rc)
2304                 return rc;
2305
2306         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
2307
2308         /* 4 for rfc1002 length field */
2309         iov[0].iov_len = 4;
2310         iov[0].iov_base = (char *)req;
2311         iov[1].iov_len = get_rfc1002_length(req);
2312         iov[1].iov_base = (char *)req + 4;
2313
2314         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2315                              server, CIFS_ECHO_OP);
2316         if (rc)
2317                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2318
2319         cifs_small_buf_release(req);
2320         return rc;
2321 }
2322
2323 int
2324 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2325            u64 volatile_fid)
2326 {
2327         struct smb2_flush_req *req;
2328         struct cifs_ses *ses = tcon->ses;
2329         struct kvec iov[1];
2330         struct kvec rsp_iov;
2331         int resp_buftype;
2332         int rc = 0;
2333         int flags = 0;
2334
2335         cifs_dbg(FYI, "Flush\n");
2336
2337         if (!ses || !(ses->server))
2338                 return -EIO;
2339
2340         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
2341         if (rc)
2342                 return rc;
2343
2344         if (encryption_required(tcon))
2345                 flags |= CIFS_TRANSFORM_REQ;
2346
2347         req->PersistentFileId = persistent_fid;
2348         req->VolatileFileId = volatile_fid;
2349
2350         iov[0].iov_base = (char *)req;
2351         /* 4 for rfc1002 length field */
2352         iov[0].iov_len = get_rfc1002_length(req) + 4;
2353
2354         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2355         cifs_small_buf_release(req);
2356
2357         if (rc != 0)
2358                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2359
2360         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2361         return rc;
2362 }
2363
2364 /*
2365  * To form a chain of read requests, any read requests after the first should
2366  * have the end_of_chain boolean set to true.
2367  */
2368 static int
2369 smb2_new_read_req(void **buf, unsigned int *total_len,
2370                   struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
2371                   int request_type)
2372 {
2373         int rc = -EACCES;
2374         struct smb2_read_plain_req *req = NULL;
2375         struct smb2_sync_hdr *shdr;
2376
2377         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2378                                  total_len);
2379         if (rc)
2380                 return rc;
2381         if (io_parms->tcon->ses->server == NULL)
2382                 return -ECONNABORTED;
2383
2384         shdr = &req->sync_hdr;
2385         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2386
2387         req->PersistentFileId = io_parms->persistent_fid;
2388         req->VolatileFileId = io_parms->volatile_fid;
2389         req->ReadChannelInfoOffset = 0; /* reserved */
2390         req->ReadChannelInfoLength = 0; /* reserved */
2391         req->Channel = 0; /* reserved */
2392         req->MinimumCount = 0;
2393         req->Length = cpu_to_le32(io_parms->length);
2394         req->Offset = cpu_to_le64(io_parms->offset);
2395
2396         if (request_type & CHAINED_REQUEST) {
2397                 if (!(request_type & END_OF_CHAIN)) {
2398                         /* next 8-byte aligned request */
2399                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2400                         shdr->NextCommand = cpu_to_le32(*total_len);
2401                 } else /* END_OF_CHAIN */
2402                         shdr->NextCommand = 0;
2403                 if (request_type & RELATED_REQUEST) {
2404                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2405                         /*
2406                          * Related requests use info from previous read request
2407                          * in chain.
2408                          */
2409                         shdr->SessionId = 0xFFFFFFFF;
2410                         shdr->TreeId = 0xFFFFFFFF;
2411                         req->PersistentFileId = 0xFFFFFFFF;
2412                         req->VolatileFileId = 0xFFFFFFFF;
2413                 }
2414         }
2415         if (remaining_bytes > io_parms->length)
2416                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2417         else
2418                 req->RemainingBytes = 0;
2419
2420         *buf = req;
2421         return rc;
2422 }
2423
2424 static void
2425 smb2_readv_callback(struct mid_q_entry *mid)
2426 {
2427         struct cifs_readdata *rdata = mid->callback_data;
2428         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2429         struct TCP_Server_Info *server = tcon->ses->server;
2430         struct smb2_sync_hdr *shdr =
2431                                 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2432         unsigned int credits_received = 1;
2433         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2434                                  .rq_nvec = 2,
2435                                  .rq_pages = rdata->pages,
2436                                  .rq_npages = rdata->nr_pages,
2437                                  .rq_pagesz = rdata->pagesz,
2438                                  .rq_tailsz = rdata->tailsz };
2439
2440         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2441                  __func__, mid->mid, mid->mid_state, rdata->result,
2442                  rdata->bytes);
2443
2444         switch (mid->mid_state) {
2445         case MID_RESPONSE_RECEIVED:
2446                 credits_received = le16_to_cpu(shdr->CreditRequest);
2447                 /* result already set, check signature */
2448                 if (server->sign && !mid->decrypted) {
2449                         int rc;
2450
2451                         rc = smb2_verify_signature(&rqst, server);
2452                         if (rc)
2453                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2454                                          rc);
2455                 }
2456                 /* FIXME: should this be counted toward the initiating task? */
2457                 task_io_account_read(rdata->got_bytes);
2458                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2459                 break;
2460         case MID_REQUEST_SUBMITTED:
2461         case MID_RETRY_NEEDED:
2462                 rdata->result = -EAGAIN;
2463                 if (server->sign && rdata->got_bytes)
2464                         /* reset bytes number since we can not check a sign */
2465                         rdata->got_bytes = 0;
2466                 /* FIXME: should this be counted toward the initiating task? */
2467                 task_io_account_read(rdata->got_bytes);
2468                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2469                 break;
2470         default:
2471                 if (rdata->result != -ENODATA)
2472                         rdata->result = -EIO;
2473         }
2474
2475         if (rdata->result)
2476                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2477
2478         queue_work(cifsiod_wq, &rdata->work);
2479         DeleteMidQEntry(mid);
2480         add_credits(server, credits_received, 0);
2481 }
2482
2483 /* smb2_async_readv - send an async read, and set up mid to handle result */
2484 int
2485 smb2_async_readv(struct cifs_readdata *rdata)
2486 {
2487         int rc, flags = 0;
2488         char *buf;
2489         struct smb2_sync_hdr *shdr;
2490         struct cifs_io_parms io_parms;
2491         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2492                                  .rq_nvec = 2 };
2493         struct TCP_Server_Info *server;
2494         unsigned int total_len;
2495         __be32 req_len;
2496
2497         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2498                  __func__, rdata->offset, rdata->bytes);
2499
2500         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2501         io_parms.offset = rdata->offset;
2502         io_parms.length = rdata->bytes;
2503         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2504         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2505         io_parms.pid = rdata->pid;
2506
2507         server = io_parms.tcon->ses->server;
2508
2509         rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2510         if (rc) {
2511                 if (rc == -EAGAIN && rdata->credits) {
2512                         /* credits was reset by reconnect */
2513                         rdata->credits = 0;
2514                         /* reduce in_flight value since we won't send the req */
2515                         spin_lock(&server->req_lock);
2516                         server->in_flight--;
2517                         spin_unlock(&server->req_lock);
2518                 }
2519                 return rc;
2520         }
2521
2522         if (encryption_required(io_parms.tcon))
2523                 flags |= CIFS_TRANSFORM_REQ;
2524
2525         req_len = cpu_to_be32(total_len);
2526
2527         rdata->iov[0].iov_base = &req_len;
2528         rdata->iov[0].iov_len = sizeof(__be32);
2529         rdata->iov[1].iov_base = buf;
2530         rdata->iov[1].iov_len = total_len;
2531
2532         shdr = (struct smb2_sync_hdr *)buf;
2533
2534         if (rdata->credits) {
2535                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2536                                                 SMB2_MAX_BUFFER_SIZE));
2537                 shdr->CreditRequest = shdr->CreditCharge;
2538                 spin_lock(&server->req_lock);
2539                 server->credits += rdata->credits -
2540                                                 le16_to_cpu(shdr->CreditCharge);
2541                 spin_unlock(&server->req_lock);
2542                 wake_up(&server->request_q);
2543                 flags |= CIFS_HAS_CREDITS;
2544         }
2545
2546         kref_get(&rdata->refcount);
2547         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2548                              cifs_readv_receive, smb2_readv_callback,
2549                              smb3_handle_read_data, rdata, flags);
2550         if (rc) {
2551                 kref_put(&rdata->refcount, cifs_readdata_release);
2552                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2553         }
2554
2555         cifs_small_buf_release(buf);
2556         return rc;
2557 }
2558
2559 int
2560 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2561           unsigned int *nbytes, char **buf, int *buf_type)
2562 {
2563         int resp_buftype, rc = -EACCES;
2564         struct smb2_read_plain_req *req = NULL;
2565         struct smb2_read_rsp *rsp = NULL;
2566         struct smb2_sync_hdr *shdr;
2567         struct kvec iov[2];
2568         struct kvec rsp_iov;
2569         unsigned int total_len;
2570         __be32 req_len;
2571         struct smb_rqst rqst = { .rq_iov = iov,
2572                                  .rq_nvec = 2 };
2573         int flags = CIFS_LOG_ERROR;
2574         struct cifs_ses *ses = io_parms->tcon->ses;
2575
2576         *nbytes = 0;
2577         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2578         if (rc)
2579                 return rc;
2580
2581         if (encryption_required(io_parms->tcon))
2582                 flags |= CIFS_TRANSFORM_REQ;
2583
2584         req_len = cpu_to_be32(total_len);
2585
2586         iov[0].iov_base = &req_len;
2587         iov[0].iov_len = sizeof(__be32);
2588         iov[1].iov_base = req;
2589         iov[1].iov_len = total_len;
2590
2591         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2592         cifs_small_buf_release(req);
2593
2594         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2595         shdr = get_sync_hdr(rsp);
2596
2597         if (shdr->Status == STATUS_END_OF_FILE) {
2598                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2599                 return 0;
2600         }
2601
2602         if (rc) {
2603                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2604                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2605         } else {
2606                 *nbytes = le32_to_cpu(rsp->DataLength);
2607                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2608                     (*nbytes > io_parms->length)) {
2609                         cifs_dbg(FYI, "bad length %d for count %d\n",
2610                                  *nbytes, io_parms->length);
2611                         rc = -EIO;
2612                         *nbytes = 0;
2613                 }
2614         }
2615
2616         if (*buf) {
2617                 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2618                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2619         } else if (resp_buftype != CIFS_NO_BUFFER) {
2620                 *buf = rsp_iov.iov_base;
2621                 if (resp_buftype == CIFS_SMALL_BUFFER)
2622                         *buf_type = CIFS_SMALL_BUFFER;
2623                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2624                         *buf_type = CIFS_LARGE_BUFFER;
2625         }
2626         return rc;
2627 }
2628
2629 /*
2630  * Check the mid_state and signature on received buffer (if any), and queue the
2631  * workqueue completion task.
2632  */
2633 static void
2634 smb2_writev_callback(struct mid_q_entry *mid)
2635 {
2636         struct cifs_writedata *wdata = mid->callback_data;
2637         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2638         unsigned int written;
2639         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2640         unsigned int credits_received = 1;
2641
2642         switch (mid->mid_state) {
2643         case MID_RESPONSE_RECEIVED:
2644                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2645                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2646                 if (wdata->result != 0)
2647                         break;
2648
2649                 written = le32_to_cpu(rsp->DataLength);
2650                 /*
2651                  * Mask off high 16 bits when bytes written as returned
2652                  * by the server is greater than bytes requested by the
2653                  * client. OS/2 servers are known to set incorrect
2654                  * CountHigh values.
2655                  */
2656                 if (written > wdata->bytes)
2657                         written &= 0xFFFF;
2658
2659                 if (written < wdata->bytes)
2660                         wdata->result = -ENOSPC;
2661                 else
2662                         wdata->bytes = written;
2663                 break;
2664         case MID_REQUEST_SUBMITTED:
2665         case MID_RETRY_NEEDED:
2666                 wdata->result = -EAGAIN;
2667                 break;
2668         default:
2669                 wdata->result = -EIO;
2670                 break;
2671         }
2672
2673         if (wdata->result)
2674                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2675
2676         queue_work(cifsiod_wq, &wdata->work);
2677         DeleteMidQEntry(mid);
2678         add_credits(tcon->ses->server, credits_received, 0);
2679 }
2680
2681 /* smb2_async_writev - send an async write, and set up mid to handle result */
2682 int
2683 smb2_async_writev(struct cifs_writedata *wdata,
2684                   void (*release)(struct kref *kref))
2685 {
2686         int rc = -EACCES, flags = 0;
2687         struct smb2_write_req *req = NULL;
2688         struct smb2_sync_hdr *shdr;
2689         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2690         struct TCP_Server_Info *server = tcon->ses->server;
2691         struct kvec iov[2];
2692         struct smb_rqst rqst = { };
2693
2694         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2695         if (rc) {
2696                 if (rc == -EAGAIN && wdata->credits) {
2697                         /* credits was reset by reconnect */
2698                         wdata->credits = 0;
2699                         /* reduce in_flight value since we won't send the req */
2700                         spin_lock(&server->req_lock);
2701                         server->in_flight--;
2702                         spin_unlock(&server->req_lock);
2703                 }
2704                 goto async_writev_out;
2705         }
2706
2707         if (encryption_required(tcon))
2708                 flags |= CIFS_TRANSFORM_REQ;
2709
2710         shdr = get_sync_hdr(req);
2711         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2712
2713         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2714         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2715         req->WriteChannelInfoOffset = 0;
2716         req->WriteChannelInfoLength = 0;
2717         req->Channel = 0;
2718         req->Offset = cpu_to_le64(wdata->offset);
2719         /* 4 for rfc1002 length field */
2720         req->DataOffset = cpu_to_le16(
2721                                 offsetof(struct smb2_write_req, Buffer) - 4);
2722         req->RemainingBytes = 0;
2723
2724         /* 4 for rfc1002 length field and 1 for Buffer */
2725         iov[0].iov_len = 4;
2726         iov[0].iov_base = req;
2727         iov[1].iov_len = get_rfc1002_length(req) - 1;
2728         iov[1].iov_base = (char *)req + 4;
2729
2730         rqst.rq_iov = iov;
2731         rqst.rq_nvec = 2;
2732         rqst.rq_pages = wdata->pages;
2733         rqst.rq_npages = wdata->nr_pages;
2734         rqst.rq_pagesz = wdata->pagesz;
2735         rqst.rq_tailsz = wdata->tailsz;
2736
2737         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2738                  wdata->offset, wdata->bytes);
2739
2740         req->Length = cpu_to_le32(wdata->bytes);
2741
2742         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2743
2744         if (wdata->credits) {
2745                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2746                                                     SMB2_MAX_BUFFER_SIZE));
2747                 shdr->CreditRequest = shdr->CreditCharge;
2748                 spin_lock(&server->req_lock);
2749                 server->credits += wdata->credits -
2750                                                 le16_to_cpu(shdr->CreditCharge);
2751                 spin_unlock(&server->req_lock);
2752                 wake_up(&server->request_q);
2753                 flags |= CIFS_HAS_CREDITS;
2754         }
2755
2756         kref_get(&wdata->refcount);
2757         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
2758                              wdata, flags);
2759
2760         if (rc) {
2761                 kref_put(&wdata->refcount, release);
2762                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2763         }
2764
2765 async_writev_out:
2766         cifs_small_buf_release(req);
2767         return rc;
2768 }
2769
2770 /*
2771  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2772  * The length field from io_parms must be at least 1 and indicates a number of
2773  * elements with data to write that begins with position 1 in iov array. All
2774  * data length is specified by count.
2775  */
2776 int
2777 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2778            unsigned int *nbytes, struct kvec *iov, int n_vec)
2779 {
2780         int rc = 0;
2781         struct smb2_write_req *req = NULL;
2782         struct smb2_write_rsp *rsp = NULL;
2783         int resp_buftype;
2784         struct kvec rsp_iov;
2785         int flags = 0;
2786
2787         *nbytes = 0;
2788
2789         if (n_vec < 1)
2790                 return rc;
2791
2792         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2793         if (rc)
2794                 return rc;
2795
2796         if (io_parms->tcon->ses->server == NULL)
2797                 return -ECONNABORTED;
2798
2799         if (encryption_required(io_parms->tcon))
2800                 flags |= CIFS_TRANSFORM_REQ;
2801
2802         req->hdr.sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2803
2804         req->PersistentFileId = io_parms->persistent_fid;
2805         req->VolatileFileId = io_parms->volatile_fid;
2806         req->WriteChannelInfoOffset = 0;
2807         req->WriteChannelInfoLength = 0;
2808         req->Channel = 0;
2809         req->Length = cpu_to_le32(io_parms->length);
2810         req->Offset = cpu_to_le64(io_parms->offset);
2811         /* 4 for rfc1002 length field */
2812         req->DataOffset = cpu_to_le16(
2813                                 offsetof(struct smb2_write_req, Buffer) - 4);
2814         req->RemainingBytes = 0;
2815
2816         iov[0].iov_base = (char *)req;
2817         /* 4 for rfc1002 length field and 1 for Buffer */
2818         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2819
2820         /* length of entire message including data to be written */
2821         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2822
2823         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2824                           &resp_buftype, flags, &rsp_iov);
2825         cifs_small_buf_release(req);
2826         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2827
2828         if (rc) {
2829                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2830                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2831         } else
2832                 *nbytes = le32_to_cpu(rsp->DataLength);
2833
2834         free_rsp_buf(resp_buftype, rsp);
2835         return rc;
2836 }
2837
2838 static unsigned int
2839 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2840 {
2841         int len;
2842         unsigned int entrycount = 0;
2843         unsigned int next_offset = 0;
2844         FILE_DIRECTORY_INFO *entryptr;
2845
2846         if (bufstart == NULL)
2847                 return 0;
2848
2849         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2850
2851         while (1) {
2852                 entryptr = (FILE_DIRECTORY_INFO *)
2853                                         ((char *)entryptr + next_offset);
2854
2855                 if ((char *)entryptr + size > end_of_buf) {
2856                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2857                         break;
2858                 }
2859
2860                 len = le32_to_cpu(entryptr->FileNameLength);
2861                 if ((char *)entryptr + len + size > end_of_buf) {
2862                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2863                                  end_of_buf);
2864                         break;
2865                 }
2866
2867                 *lastentry = (char *)entryptr;
2868                 entrycount++;
2869
2870                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2871                 if (!next_offset)
2872                         break;
2873         }
2874
2875         return entrycount;
2876 }
2877
2878 /*
2879  * Readdir/FindFirst
2880  */
2881 int
2882 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2883                      u64 persistent_fid, u64 volatile_fid, int index,
2884                      struct cifs_search_info *srch_inf)
2885 {
2886         struct smb2_query_directory_req *req;
2887         struct smb2_query_directory_rsp *rsp = NULL;
2888         struct kvec iov[2];
2889         struct kvec rsp_iov;
2890         int rc = 0;
2891         int len;
2892         int resp_buftype = CIFS_NO_BUFFER;
2893         unsigned char *bufptr;
2894         struct TCP_Server_Info *server;
2895         struct cifs_ses *ses = tcon->ses;
2896         __le16 asteriks = cpu_to_le16('*');
2897         char *end_of_smb;
2898         unsigned int output_size = CIFSMaxBufSize;
2899         size_t info_buf_size;
2900         int flags = 0;
2901
2902         if (ses && (ses->server))
2903                 server = ses->server;
2904         else
2905                 return -EIO;
2906
2907         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2908         if (rc)
2909                 return rc;
2910
2911         if (encryption_required(tcon))
2912                 flags |= CIFS_TRANSFORM_REQ;
2913
2914         switch (srch_inf->info_level) {
2915         case SMB_FIND_FILE_DIRECTORY_INFO:
2916                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2917                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2918                 break;
2919         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2920                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2921                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2922                 break;
2923         default:
2924                 cifs_dbg(VFS, "info level %u isn't supported\n",
2925                          srch_inf->info_level);
2926                 rc = -EINVAL;
2927                 goto qdir_exit;
2928         }
2929
2930         req->FileIndex = cpu_to_le32(index);
2931         req->PersistentFileId = persistent_fid;
2932         req->VolatileFileId = volatile_fid;
2933
2934         len = 0x2;
2935         bufptr = req->Buffer;
2936         memcpy(bufptr, &asteriks, len);
2937
2938         req->FileNameOffset =
2939                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2940         req->FileNameLength = cpu_to_le16(len);
2941         /*
2942          * BB could be 30 bytes or so longer if we used SMB2 specific
2943          * buffer lengths, but this is safe and close enough.
2944          */
2945         output_size = min_t(unsigned int, output_size, server->maxBuf);
2946         output_size = min_t(unsigned int, output_size, 2 << 15);
2947         req->OutputBufferLength = cpu_to_le32(output_size);
2948
2949         iov[0].iov_base = (char *)req;
2950         /* 4 for RFC1001 length and 1 for Buffer */
2951         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2952
2953         iov[1].iov_base = (char *)(req->Buffer);
2954         iov[1].iov_len = len;
2955
2956         inc_rfc1001_len(req, len - 1 /* Buffer */);
2957
2958         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
2959         cifs_small_buf_release(req);
2960         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
2961
2962         if (rc) {
2963                 if (rc == -ENODATA &&
2964                     rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
2965                         srch_inf->endOfSearch = true;
2966                         rc = 0;
2967                 }
2968                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2969                 goto qdir_exit;
2970         }
2971
2972         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2973                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2974                           info_buf_size);
2975         if (rc)
2976                 goto qdir_exit;
2977
2978         srch_inf->unicode = true;
2979
2980         if (srch_inf->ntwrk_buf_start) {
2981                 if (srch_inf->smallBuf)
2982                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2983                 else
2984                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2985         }
2986         srch_inf->ntwrk_buf_start = (char *)rsp;
2987         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2988                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2989         /* 4 for rfc1002 length field */
2990         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2991         srch_inf->entries_in_buffer =
2992                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2993                                     &srch_inf->last_entry, info_buf_size);
2994         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2995         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2996                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2997                  srch_inf->srch_entries_start, srch_inf->last_entry);
2998         if (resp_buftype == CIFS_LARGE_BUFFER)
2999                 srch_inf->smallBuf = false;
3000         else if (resp_buftype == CIFS_SMALL_BUFFER)
3001                 srch_inf->smallBuf = true;
3002         else
3003                 cifs_dbg(VFS, "illegal search buffer type\n");
3004
3005         return rc;
3006
3007 qdir_exit:
3008         free_rsp_buf(resp_buftype, rsp);
3009         return rc;
3010 }
3011
3012 static int
3013 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3014                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3015                u8 info_type, u32 additional_info, unsigned int num,
3016                 void **data, unsigned int *size)
3017 {
3018         struct smb2_set_info_req *req;
3019         struct smb2_set_info_rsp *rsp = NULL;
3020         struct kvec *iov;
3021         struct kvec rsp_iov;
3022         int rc = 0;
3023         int resp_buftype;
3024         unsigned int i;
3025         struct cifs_ses *ses = tcon->ses;
3026         int flags = 0;
3027
3028         if (!ses || !(ses->server))
3029                 return -EIO;
3030
3031         if (!num)
3032                 return -EINVAL;
3033
3034         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
3035         if (!iov)
3036                 return -ENOMEM;
3037
3038         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
3039         if (rc) {
3040                 kfree(iov);
3041                 return rc;
3042         }
3043
3044         if (encryption_required(tcon))
3045                 flags |= CIFS_TRANSFORM_REQ;
3046
3047         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3048
3049         req->InfoType = info_type;
3050         req->FileInfoClass = info_class;
3051         req->PersistentFileId = persistent_fid;
3052         req->VolatileFileId = volatile_fid;
3053         req->AdditionalInformation = cpu_to_le32(additional_info);
3054
3055         /* 4 for RFC1001 length and 1 for Buffer */
3056         req->BufferOffset =
3057                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
3058         req->BufferLength = cpu_to_le32(*size);
3059
3060         inc_rfc1001_len(req, *size - 1 /* Buffer */);
3061
3062         memcpy(req->Buffer, *data, *size);
3063
3064         iov[0].iov_base = (char *)req;
3065         /* 4 for RFC1001 length */
3066         iov[0].iov_len = get_rfc1002_length(req) + 4;
3067
3068         for (i = 1; i < num; i++) {
3069                 inc_rfc1001_len(req, size[i]);
3070                 le32_add_cpu(&req->BufferLength, size[i]);
3071                 iov[i].iov_base = (char *)data[i];
3072                 iov[i].iov_len = size[i];
3073         }
3074
3075         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
3076         cifs_small_buf_release(req);
3077         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3078
3079         if (rc != 0)
3080                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3081
3082         free_rsp_buf(resp_buftype, rsp);
3083         kfree(iov);
3084         return rc;
3085 }
3086
3087 int
3088 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3089             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3090 {
3091         struct smb2_file_rename_info info;
3092         void **data;
3093         unsigned int size[2];
3094         int rc;
3095         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3096
3097         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3098         if (!data)
3099                 return -ENOMEM;
3100
3101         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3102                               /* 0 = fail if target already exists */
3103         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3104         info.FileNameLength = cpu_to_le32(len);
3105
3106         data[0] = &info;
3107         size[0] = sizeof(struct smb2_file_rename_info);
3108
3109         data[1] = target_file;
3110         size[1] = len + 2 /* null */;
3111
3112         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3113                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3114                 0, 2, data, size);
3115         kfree(data);
3116         return rc;
3117 }
3118
3119 int
3120 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3121                   u64 persistent_fid, u64 volatile_fid)
3122 {
3123         __u8 delete_pending = 1;
3124         void *data;
3125         unsigned int size;
3126
3127         data = &delete_pending;
3128         size = 1; /* sizeof __u8 */
3129
3130         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3131                 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3132                 0, 1, &data, &size);
3133 }
3134
3135 int
3136 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3137                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3138 {
3139         struct smb2_file_link_info info;
3140         void **data;
3141         unsigned int size[2];
3142         int rc;
3143         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3144
3145         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3146         if (!data)
3147                 return -ENOMEM;
3148
3149         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3150                               /* 0 = fail if link already exists */
3151         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3152         info.FileNameLength = cpu_to_le32(len);
3153
3154         data[0] = &info;
3155         size[0] = sizeof(struct smb2_file_link_info);
3156
3157         data[1] = target_file;
3158         size[1] = len + 2 /* null */;
3159
3160         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3161                         current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
3162                         0, 2, data, size);
3163         kfree(data);
3164         return rc;
3165 }
3166
3167 int
3168 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3169              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3170 {
3171         struct smb2_file_eof_info info;
3172         void *data;
3173         unsigned int size;
3174
3175         info.EndOfFile = *eof;
3176
3177         data = &info;
3178         size = sizeof(struct smb2_file_eof_info);
3179
3180         if (is_falloc)
3181                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3182                         pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
3183                         0, 1, &data, &size);
3184         else
3185                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3186                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
3187                         0, 1, &data, &size);
3188 }
3189
3190 int
3191 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3192               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3193 {
3194         unsigned int size;
3195         size = sizeof(FILE_BASIC_INFO);
3196         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3197                 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
3198                 0, 1, (void **)&buf, &size);
3199 }
3200
3201 int
3202 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
3203                 u64 persistent_fid, u64 volatile_fid,
3204                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
3205 {
3206         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3207                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
3208                         1, (void **)&pnntsd, &pacllen);
3209 }
3210
3211 int
3212 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
3213             u64 persistent_fid, u64 volatile_fid,
3214             struct smb2_file_full_ea_info *buf, int len)
3215 {
3216         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3217                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
3218                 0, 1, (void **)&buf, &len);
3219 }
3220
3221 int
3222 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3223                   const u64 persistent_fid, const u64 volatile_fid,
3224                   __u8 oplock_level)
3225 {
3226         int rc;
3227         struct smb2_oplock_break *req = NULL;
3228         int flags = CIFS_OBREAK_OP;
3229
3230         cifs_dbg(FYI, "SMB2_oplock_break\n");
3231         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3232         if (rc)
3233                 return rc;
3234
3235         if (encryption_required(tcon))
3236                 flags |= CIFS_TRANSFORM_REQ;
3237
3238         req->VolatileFid = volatile_fid;
3239         req->PersistentFid = persistent_fid;
3240         req->OplockLevel = oplock_level;
3241         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3242
3243         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3244         cifs_small_buf_release(req);
3245
3246         if (rc) {
3247                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3248                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3249         }
3250
3251         return rc;
3252 }
3253
3254 static void
3255 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3256                         struct kstatfs *kst)
3257 {
3258         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3259                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3260         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3261         kst->f_bfree  = kst->f_bavail =
3262                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3263         return;
3264 }
3265
3266 static int
3267 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3268                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3269 {
3270         int rc;
3271         struct smb2_query_info_req *req;
3272
3273         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3274
3275         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3276                 return -EIO;
3277
3278         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
3279         if (rc)
3280                 return rc;
3281
3282         req->InfoType = SMB2_O_INFO_FILESYSTEM;
3283         req->FileInfoClass = level;
3284         req->PersistentFileId = persistent_fid;
3285         req->VolatileFileId = volatile_fid;
3286         /* 4 for rfc1002 length field and 1 for pad */
3287         req->InputBufferOffset =
3288                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
3289         req->OutputBufferLength = cpu_to_le32(
3290                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
3291
3292         iov->iov_base = (char *)req;
3293         /* 4 for rfc1002 length field */
3294         iov->iov_len = get_rfc1002_length(req) + 4;
3295         return 0;
3296 }
3297
3298 int
3299 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3300               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3301 {
3302         struct smb2_query_info_rsp *rsp = NULL;
3303         struct kvec iov;
3304         struct kvec rsp_iov;
3305         int rc = 0;
3306         int resp_buftype;
3307         struct cifs_ses *ses = tcon->ses;
3308         struct smb2_fs_full_size_info *info = NULL;
3309         int flags = 0;
3310
3311         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3312                                 sizeof(struct smb2_fs_full_size_info),
3313                                 persistent_fid, volatile_fid);
3314         if (rc)
3315                 return rc;
3316
3317         if (encryption_required(tcon))
3318                 flags |= CIFS_TRANSFORM_REQ;
3319
3320         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3321         cifs_small_buf_release(iov.iov_base);
3322         if (rc) {
3323                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3324                 goto qfsinf_exit;
3325         }
3326         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3327
3328         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
3329                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3330         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3331                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3332                           sizeof(struct smb2_fs_full_size_info));
3333         if (!rc)
3334                 copy_fs_info_to_kstatfs(info, fsdata);
3335
3336 qfsinf_exit:
3337         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3338         return rc;
3339 }
3340
3341 int
3342 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3343               u64 persistent_fid, u64 volatile_fid, int level)
3344 {
3345         struct smb2_query_info_rsp *rsp = NULL;
3346         struct kvec iov;
3347         struct kvec rsp_iov;
3348         int rc = 0;
3349         int resp_buftype, max_len, min_len;
3350         struct cifs_ses *ses = tcon->ses;
3351         unsigned int rsp_len, offset;
3352         int flags = 0;
3353
3354         if (level == FS_DEVICE_INFORMATION) {
3355                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3356                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3357         } else if (level == FS_ATTRIBUTE_INFORMATION) {
3358                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3359                 min_len = MIN_FS_ATTR_INFO_SIZE;
3360         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3361                 max_len = sizeof(struct smb3_fs_ss_info);
3362                 min_len = sizeof(struct smb3_fs_ss_info);
3363         } else {
3364                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3365                 return -EINVAL;
3366         }
3367
3368         rc = build_qfs_info_req(&iov, tcon, level, max_len,
3369                                 persistent_fid, volatile_fid);
3370         if (rc)
3371                 return rc;
3372
3373         if (encryption_required(tcon))
3374                 flags |= CIFS_TRANSFORM_REQ;
3375
3376         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3377         cifs_small_buf_release(iov.iov_base);
3378         if (rc) {
3379                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3380                 goto qfsattr_exit;
3381         }
3382         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3383
3384         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3385         offset = le16_to_cpu(rsp->OutputBufferOffset);
3386         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3387         if (rc)
3388                 goto qfsattr_exit;
3389
3390         if (level == FS_ATTRIBUTE_INFORMATION)
3391                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
3392                         + (char *)&rsp->hdr, min_t(unsigned int,
3393                         rsp_len, max_len));
3394         else if (level == FS_DEVICE_INFORMATION)
3395                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
3396                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3397         else if (level == FS_SECTOR_SIZE_INFORMATION) {
3398                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3399                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
3400                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3401                 tcon->perf_sector_size =
3402                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3403         }
3404
3405 qfsattr_exit:
3406         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3407         return rc;
3408 }
3409
3410 int
3411 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3412            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3413            const __u32 num_lock, struct smb2_lock_element *buf)
3414 {
3415         int rc = 0;
3416         struct smb2_lock_req *req = NULL;
3417         struct kvec iov[2];
3418         struct kvec rsp_iov;
3419         int resp_buf_type;
3420         unsigned int count;
3421         int flags = CIFS_NO_RESP;
3422
3423         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3424
3425         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
3426         if (rc)
3427                 return rc;
3428
3429         if (encryption_required(tcon))
3430                 flags |= CIFS_TRANSFORM_REQ;
3431
3432         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3433         req->LockCount = cpu_to_le16(num_lock);
3434
3435         req->PersistentFileId = persist_fid;
3436         req->VolatileFileId = volatile_fid;
3437
3438         count = num_lock * sizeof(struct smb2_lock_element);
3439         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
3440
3441         iov[0].iov_base = (char *)req;
3442         /* 4 for rfc1002 length field and count for all locks */
3443         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
3444         iov[1].iov_base = (char *)buf;
3445         iov[1].iov_len = count;
3446
3447         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3448         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3449                           &rsp_iov);
3450         cifs_small_buf_release(req);
3451         if (rc) {
3452                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3453                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3454         }
3455
3456         return rc;
3457 }
3458
3459 int
3460 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3461           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3462           const __u64 length, const __u64 offset, const __u32 lock_flags,
3463           const bool wait)
3464 {
3465         struct smb2_lock_element lock;
3466
3467         lock.Offset = cpu_to_le64(offset);
3468         lock.Length = cpu_to_le64(length);
3469         lock.Flags = cpu_to_le32(lock_flags);
3470         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3471                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3472
3473         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3474 }
3475
3476 int
3477 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3478                  __u8 *lease_key, const __le32 lease_state)
3479 {
3480         int rc;
3481         struct smb2_lease_ack *req = NULL;
3482         int flags = CIFS_OBREAK_OP;
3483
3484         cifs_dbg(FYI, "SMB2_lease_break\n");
3485         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3486         if (rc)
3487                 return rc;
3488
3489         if (encryption_required(tcon))
3490                 flags |= CIFS_TRANSFORM_REQ;
3491
3492         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3493         req->StructureSize = cpu_to_le16(36);
3494         inc_rfc1001_len(req, 12);
3495
3496         memcpy(req->LeaseKey, lease_key, 16);
3497         req->LeaseState = lease_state;
3498
3499         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3500         cifs_small_buf_release(req);
3501
3502         if (rc) {
3503                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3504                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3505         }
3506
3507         return rc;
3508 }