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/pagemap.h>
  37 #include <linux/xattr.h>
  38 #include "smb2pdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsacl.h"
  41 #include "cifsproto.h"
  42 #include "smb2proto.h"
  43 #include "cifs_unicode.h"
  44 #include "cifs_debug.h"
  45 #include "ntlmssp.h"
  46 #include "smb2status.h"
  47 #include "smb2glob.h"
  48 #include "cifspdu.h"
  49
  50 /*
  51  *  The following table defines the expected "StructureSize" of SMB2 requests
  52  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  53  *
  54  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  55  *  indexed by command in host byte order.
  56  */
  57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  58         /* SMB2_NEGOTIATE */ 36,
  59         /* SMB2_SESSION_SETUP */ 25,
  60         /* SMB2_LOGOFF */ 4,
  61         /* SMB2_TREE_CONNECT */ 9,
  62         /* SMB2_TREE_DISCONNECT */ 4,
  63         /* SMB2_CREATE */ 57,
  64         /* SMB2_CLOSE */ 24,
  65         /* SMB2_FLUSH */ 24,
  66         /* SMB2_READ */ 49,
  67         /* SMB2_WRITE */ 49,
  68         /* SMB2_LOCK */ 48,
  69         /* SMB2_IOCTL */ 57,
  70         /* SMB2_CANCEL */ 4,
  71         /* SMB2_ECHO */ 4,
  72         /* SMB2_QUERY_DIRECTORY */ 33,
  73         /* SMB2_CHANGE_NOTIFY */ 32,
  74         /* SMB2_QUERY_INFO */ 41,
  75         /* SMB2_SET_INFO */ 33,
  76         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  77 };
  78
  79
  80 static void
  81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  82                   const struct cifs_tcon *tcon)
  83 {
  84         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  85         char *temp = (char *)hdr;
  86         /* lookup word count ie StructureSize from table */
  87         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  88
  89         /*
  90          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  91          * largest operations (Create)
  92          */
  93         memset(temp, 0, 256);
  94
  95         /* Note this is only network field converted to big endian */
  96         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  97                         - 4 /*  RFC 1001 length field itself not counted */);
  98
  99         hdr->ProtocolId[0] = 0xFE;
 100         hdr->ProtocolId[1] = 'S';
 101         hdr->ProtocolId[2] = 'M';
 102         hdr->ProtocolId[3] = 'B';
 103         hdr->StructureSize = cpu_to_le16(64);
 104         hdr->Command = smb2_cmd;
 105         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 106         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 107
 108         if (!tcon)
 109                 goto out;
 110
 111         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if ((tcon->ses) &&
 115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 hdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         hdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 hdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         pdu->StructureSize2 = cpu_to_le16(parmsize);
 141         return;
 142 }
 143
 144 static int
 145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 146 {
 147         int rc = 0;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         struct TCP_Server_Info *server;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return rc;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return rc;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server))
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         server = ses->server;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to reconnect, should be
 186          * greater than cifs socket timeout which is 7 seconds
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 wait_event_interruptible_timeout(server->response_q,
 205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 206
 207                 /* are we still trying to reconnect? */
 208                 if (server->tcpStatus != CifsNeedReconnect)
 209                         break;
 210
 211                 /*
 212                  * on "soft" mounts we wait once. Hard mounts keep
 213                  * retrying until process is killed or server comes
 214                  * back on-line
 215                  */
 216                 if (!tcon->retry) {
 217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 218                         return -EHOSTDOWN;
 219                 }
 220         }
 221
 222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 223                 return rc;
 224
 225         nls_codepage = load_nls_default();
 226
 227         /*
 228          * need to prevent multiple threads trying to simultaneously reconnect
 229          * the same SMB session
 230          */
 231         mutex_lock(&tcon->ses->session_mutex);
 232         rc = cifs_negotiate_protocol(0, tcon->ses);
 233         if (!rc && tcon->ses->need_reconnect)
 234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 235
 236         if (rc || !tcon->need_reconnect) {
 237                 mutex_unlock(&tcon->ses->session_mutex);
 238                 goto out;
 239         }
 240
 241         cifs_mark_open_files_invalid(tcon);
 242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 243         mutex_unlock(&tcon->ses->session_mutex);
 244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 245         if (rc)
 246                 goto out;
 247         atomic_inc(&tconInfoReconnectCount);
 248         /*
 249          * BB FIXME add code to check if wsize needs update due to negotiated
 250          * smb buffer size shrinking.
 251          */
 252 out:
 253         /*
 254          * Check if handle based operation so we know whether we can continue
 255          * or not without returning to caller to reset file handle.
 256          */
 257         /*
 258          * BB Is flush done by server on drop of tcp session? Should we special
 259          * case it and skip above?
 260          */
 261         switch (smb2_command) {
 262         case SMB2_FLUSH:
 263         case SMB2_READ:
 264         case SMB2_WRITE:
 265         case SMB2_LOCK:
 266         case SMB2_IOCTL:
 267         case SMB2_QUERY_DIRECTORY:
 268         case SMB2_CHANGE_NOTIFY:
 269         case SMB2_QUERY_INFO:
 270         case SMB2_SET_INFO:
 271                 return -EAGAIN;
 272         }
 273         unload_nls(nls_codepage);
 274         return rc;
 275 }
 276
 277 /*
 278  * Allocate and return pointer to an SMB request hdr, and set basic
 279  * SMB information in the SMB header. If the return code is zero, this
 280  * function must have filled in request_buf pointer.
 281  */
 282 static int
 283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 284                 void **request_buf)
 285 {
 286         int rc = 0;
 287
 288         rc = smb2_reconnect(smb2_command, tcon);
 289         if (rc)
 290                 return rc;
 291
 292         /* BB eventually switch this to SMB2 specific small buf size */
 293         *request_buf = cifs_small_buf_get();
 294         if (*request_buf == NULL) {
 295                 /* BB should we add a retry in here if not a writepage? */
 296                 return -ENOMEM;
 297         }
 298
 299         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 300
 301         if (tcon != NULL) {
 302 #ifdef CONFIG_CIFS_STATS2
 303                 uint16_t com_code = le16_to_cpu(smb2_command);
 304                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 305 #endif
 306                 cifs_stats_inc(&tcon->num_smbs_sent);
 307         }
 308
 309         return rc;
 310 }
 311
 312 static void
 313 free_rsp_buf(int resp_buftype, void *rsp)
 314 {
 315         if (resp_buftype == CIFS_SMALL_BUFFER)
 316                 cifs_small_buf_release(rsp);
 317         else if (resp_buftype == CIFS_LARGE_BUFFER)
 318                 cifs_buf_release(rsp);
 319 }
 320
 321
 322 /*
 323  *
 324  *      SMB2 Worker functions follow:
 325  *
 326  *      The general structure of the worker functions is:
 327  *      1) Call smb2_init (assembles SMB2 header)
 328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 330  *      4) Decode SMB2 command specific fields in the fixed length area
 331  *      5) Decode variable length data area (if any for this SMB2 command type)
 332  *      6) Call free smb buffer
 333  *      7) return
 334  *
 335  */
 336
 337 int
 338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 339 {
 340         struct smb2_negotiate_req *req;
 341         struct smb2_negotiate_rsp *rsp;
 342         struct kvec iov[1];
 343         int rc = 0;
 344         int resp_buftype;
 345         struct TCP_Server_Info *server = ses->server;
 346         int blob_offset, blob_length;
 347         char *security_blob;
 348         int flags = CIFS_NEG_OP;
 349
 350         cifs_dbg(FYI, "Negotiate protocol\n");
 351
 352         if (!server) {
 353                 WARN(1, "%s: server is NULL!\n", __func__);
 354                 return -EIO;
 355         }
 356
 357         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 358         if (rc)
 359                 return rc;
 360
 361         req->hdr.SessionId = 0;
 362
 363         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 364
 365         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 366         inc_rfc1001_len(req, 2);
 367
 368         /* only one of SMB2 signing flags may be set in SMB2 request */
 369         if (ses->sign)
 370                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 371         else if (global_secflags & CIFSSEC_MAY_SIGN)
 372                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 373         else
 374                 req->SecurityMode = 0;
 375
 376         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 377
 378         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 379
 380         iov[0].iov_base = (char *)req;
 381         /* 4 for rfc1002 length field */
 382         iov[0].iov_len = get_rfc1002_length(req) + 4;
 383
 384         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 385
 386         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 387         /*
 388          * No tcon so can't do
 389          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 390          */
 391         if (rc != 0)
 392                 goto neg_exit;
 393
 394         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 395
 396         /* BB we may eventually want to match the negotiated vs. requested
 397            dialect, even though we are only requesting one at a time */
 398         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 399                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 400         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 401                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 402         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 403                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 404         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 405                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 406         else {
 407                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
 408                          le16_to_cpu(rsp->DialectRevision));
 409                 rc = -EIO;
 410                 goto neg_exit;
 411         }
 412         server->dialect = le16_to_cpu(rsp->DialectRevision);
 413
 414         /* SMB2 only has an extended negflavor */
 415         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 416         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 417         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 418         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 419         /* BB Do we need to validate the SecurityMode? */
 420         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 421         server->capabilities = le32_to_cpu(rsp->Capabilities);
 422         /* Internal types */
 423         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 424
 425         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 426                                                &rsp->hdr);
 427         /*
 428          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 429          * for us will be
 430          *      ses->sectype = RawNTLMSSP;
 431          * but for time being this is our only auth choice so doesn't matter.
 432          * We just found a server which sets blob length to zero expecting raw.
 433          */
 434         if (blob_length == 0)
 435                 cifs_dbg(FYI, "missing security blob on negprot\n");
 436
 437         rc = cifs_enable_signing(server, ses->sign);
 438 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 439         if (rc)
 440                 goto neg_exit;
 441         if (blob_length)
 442                 rc = decode_neg_token_init(security_blob, blob_length,
 443                                    &server->sec_type);
 444         if (rc == 1)
 445                 rc = 0;
 446         else if (rc == 0) {
 447                 rc = -EIO;
 448                 goto neg_exit;
 449         }
 450 #endif
 451
 452 neg_exit:
 453         free_rsp_buf(resp_buftype, rsp);
 454         return rc;
 455 }
 456
 457 int
 458 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 459                 const struct nls_table *nls_cp)
 460 {
 461         struct smb2_sess_setup_req *req;
 462         struct smb2_sess_setup_rsp *rsp = NULL;
 463         struct kvec iov[2];
 464         int rc = 0;
 465         int resp_buftype;
 466         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 467         struct TCP_Server_Info *server = ses->server;
 468         u16 blob_length = 0;
 469         char *security_blob;
 470         char *ntlmssp_blob = NULL;
 471         bool use_spnego = false; /* else use raw ntlmssp */
 472
 473         cifs_dbg(FYI, "Session Setup\n");
 474
 475         if (!server) {
 476                 WARN(1, "%s: server is NULL!\n", __func__);
 477                 return -EIO;
 478         }
 479
 480         /*
 481          * If memory allocation is successful, caller of this function
 482          * frees it.
 483          */
 484         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 485         if (!ses->ntlmssp)
 486                 return -ENOMEM;
 487
 488         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 489         ses->sectype = RawNTLMSSP;
 490
 491 ssetup_ntlmssp_authenticate:
 492         if (phase == NtLmChallenge)
 493                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 494
 495         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 496         if (rc)
 497                 return rc;
 498
 499         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 500         req->VcNumber = 0; /* MBZ */
 501         /* to enable echos and oplocks */
 502         req->hdr.CreditRequest = cpu_to_le16(3);
 503
 504         /* only one of SMB2 signing flags may be set in SMB2 request */
 505         if (server->sign)
 506                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 507         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 508                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 509         else
 510                 req->SecurityMode = 0;
 511
 512         req->Capabilities = 0;
 513         req->Channel = 0; /* MBZ */
 514
 515         iov[0].iov_base = (char *)req;
 516         /* 4 for rfc1002 length field and 1 for pad */
 517         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 518         if (phase == NtLmNegotiate) {
 519                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 520                                        GFP_KERNEL);
 521                 if (ntlmssp_blob == NULL) {
 522                         rc = -ENOMEM;
 523                         goto ssetup_exit;
 524                 }
 525                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 526                 if (use_spnego) {
 527                         /* blob_length = build_spnego_ntlmssp_blob(
 528                                         &security_blob,
 529                                         sizeof(struct _NEGOTIATE_MESSAGE),
 530                                         ntlmssp_blob); */
 531                         /* BB eventually need to add this */
 532                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 533                         rc = -EOPNOTSUPP;
 534                         kfree(ntlmssp_blob);
 535                         goto ssetup_exit;
 536                 } else {
 537                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 538                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 539                         security_blob = ntlmssp_blob;
 540                 }
 541         } else if (phase == NtLmAuthenticate) {
 542                 req->hdr.SessionId = ses->Suid;
 543                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 544                                        GFP_KERNEL);
 545                 if (ntlmssp_blob == NULL) {
 546                         rc = -ENOMEM;
 547                         goto ssetup_exit;
 548                 }
 549                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 550                                              nls_cp);
 551                 if (rc) {
 552                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 553                                  rc);
 554                         goto ssetup_exit; /* BB double check error handling */
 555                 }
 556                 if (use_spnego) {
 557                         /* blob_length = build_spnego_ntlmssp_blob(
 558                                                         &security_blob,
 559                                                         blob_length,
 560                                                         ntlmssp_blob); */
 561                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 562                         rc = -EOPNOTSUPP;
 563                         kfree(ntlmssp_blob);
 564                         goto ssetup_exit;
 565                 } else {
 566                         security_blob = ntlmssp_blob;
 567                 }
 568         } else {
 569                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 570                 rc = -EIO;
 571                 goto ssetup_exit;
 572         }
 573
 574         /* Testing shows that buffer offset must be at location of Buffer[0] */
 575         req->SecurityBufferOffset =
 576                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 577                                             1 /* pad */ - 4 /* rfc1001 len */);
 578         req->SecurityBufferLength = cpu_to_le16(blob_length);
 579         iov[1].iov_base = security_blob;
 580         iov[1].iov_len = blob_length;
 581
 582         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 583
 584         /* BB add code to build os and lm fields */
 585
 586         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 587                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 588
 589         kfree(security_blob);
 590         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 591         if (resp_buftype != CIFS_NO_BUFFER &&
 592             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 593                 if (phase != NtLmNegotiate) {
 594                         cifs_dbg(VFS, "Unexpected more processing error\n");
 595                         goto ssetup_exit;
 596                 }
 597                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 598                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 599                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 600                                  le16_to_cpu(rsp->SecurityBufferOffset));
 601                         rc = -EIO;
 602                         goto ssetup_exit;
 603                 }
 604
 605                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 606                 phase = NtLmChallenge; /* process ntlmssp challenge */
 607                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 608                 ses->Suid = rsp->hdr.SessionId;
 609                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 610                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 611         }
 612
 613         /*
 614          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 615          * but at least the raw NTLMSSP case works.
 616          */
 617         /*
 618          * No tcon so can't do
 619          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 620          */
 621         if (rc != 0)
 622                 goto ssetup_exit;
 623
 624         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 625 ssetup_exit:
 626         free_rsp_buf(resp_buftype, rsp);
 627
 628         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 629         if ((phase == NtLmChallenge) && (rc == 0))
 630                 goto ssetup_ntlmssp_authenticate;
 631         return rc;
 632 }
 633
 634 int
 635 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 636 {
 637         struct smb2_logoff_req *req; /* response is also trivial struct */
 638         int rc = 0;
 639         struct TCP_Server_Info *server;
 640
 641         cifs_dbg(FYI, "disconnect session %p\n", ses);
 642
 643         if (ses && (ses->server))
 644                 server = ses->server;
 645         else
 646                 return -EIO;
 647
 648         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 649         if (rc)
 650                 return rc;
 651
 652          /* since no tcon, smb2_init can not do this, so do here */
 653         req->hdr.SessionId = ses->Suid;
 654         if (server->sign)
 655                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 656
 657         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 658         /*
 659          * No tcon so can't do
 660          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 661          */
 662         return rc;
 663 }
 664
 665 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 666 {
 667         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 668 }
 669
 670 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 671
 672 int
 673 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 674           struct cifs_tcon *tcon, const struct nls_table *cp)
 675 {
 676         struct smb2_tree_connect_req *req;
 677         struct smb2_tree_connect_rsp *rsp = NULL;
 678         struct kvec iov[2];
 679         int rc = 0;
 680         int resp_buftype;
 681         int unc_path_len;
 682         struct TCP_Server_Info *server;
 683         __le16 *unc_path = NULL;
 684
 685         cifs_dbg(FYI, "TCON\n");
 686
 687         if ((ses->server) && tree)
 688                 server = ses->server;
 689         else
 690                 return -EIO;
 691
 692         if (tcon && tcon->bad_network_name)
 693                 return -ENOENT;
 694
 695         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 696         if (unc_path == NULL)
 697                 return -ENOMEM;
 698
 699         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 700         unc_path_len *= 2;
 701         if (unc_path_len < 2) {
 702                 kfree(unc_path);
 703                 return -EINVAL;
 704         }
 705
 706         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 707         if (rc) {
 708                 kfree(unc_path);
 709                 return rc;
 710         }
 711
 712         if (tcon == NULL) {
 713                 /* since no tcon, smb2_init can not do this, so do here */
 714                 req->hdr.SessionId = ses->Suid;
 715                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 716                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 717         }
 718
 719         iov[0].iov_base = (char *)req;
 720         /* 4 for rfc1002 length field and 1 for pad */
 721         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 722
 723         /* Testing shows that buffer offset must be at location of Buffer[0] */
 724         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 725                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 726         req->PathLength = cpu_to_le16(unc_path_len - 2);
 727         iov[1].iov_base = unc_path;
 728         iov[1].iov_len = unc_path_len;
 729
 730         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 731
 732         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 733         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 734
 735         if (rc != 0) {
 736                 if (tcon) {
 737                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 738                         tcon->need_reconnect = true;
 739                 }
 740                 goto tcon_error_exit;
 741         }
 742
 743         if (tcon == NULL) {
 744                 ses->ipc_tid = rsp->hdr.TreeId;
 745                 goto tcon_exit;
 746         }
 747
 748         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 749                 cifs_dbg(FYI, "connection to disk share\n");
 750         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 751                 tcon->ipc = true;
 752                 cifs_dbg(FYI, "connection to pipe share\n");
 753         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 754                 tcon->print = true;
 755                 cifs_dbg(FYI, "connection to printer\n");
 756         } else {
 757                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 758                 rc = -EOPNOTSUPP;
 759                 goto tcon_error_exit;
 760         }
 761
 762         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 763         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 764         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 765         tcon->tidStatus = CifsGood;
 766         tcon->need_reconnect = false;
 767         tcon->tid = rsp->hdr.TreeId;
 768         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 769
 770         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 771             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 772                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 773
 774 tcon_exit:
 775         free_rsp_buf(resp_buftype, rsp);
 776         kfree(unc_path);
 777         return rc;
 778
 779 tcon_error_exit:
 780         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 781                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 782                 tcon->bad_network_name = true;
 783         }
 784         goto tcon_exit;
 785 }
 786
 787 int
 788 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 789 {
 790         struct smb2_tree_disconnect_req *req; /* response is trivial */
 791         int rc = 0;
 792         struct TCP_Server_Info *server;
 793         struct cifs_ses *ses = tcon->ses;
 794
 795         cifs_dbg(FYI, "Tree Disconnect\n");
 796
 797         if (ses && (ses->server))
 798                 server = ses->server;
 799         else
 800                 return -EIO;
 801
 802         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 803                 return 0;
 804
 805         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 806         if (rc)
 807                 return rc;
 808
 809         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 810         if (rc)
 811                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 812
 813         return rc;
 814 }
 815
 816 static struct create_lease *
 817 create_lease_buf(u8 *lease_key, u8 oplock)
 818 {
 819         struct create_lease *buf;
 820
 821         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
 822         if (!buf)
 823                 return NULL;
 824
 825         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 826         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 827         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 828                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 829                                            SMB2_LEASE_READ_CACHING;
 830         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 831                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 832         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 833                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 834                                            SMB2_LEASE_READ_CACHING |
 835                                            SMB2_LEASE_WRITE_CACHING;
 836
 837         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 838                                         (struct create_lease, lcontext));
 839         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 840         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 841                                 (struct create_lease, Name));
 842         buf->ccontext.NameLength = cpu_to_le16(4);
 843         buf->Name[0] = 'R';
 844         buf->Name[1] = 'q';
 845         buf->Name[2] = 'L';
 846         buf->Name[3] = 's';
 847         return buf;
 848 }
 849
 850 static struct create_durable *
 851 create_durable_buf(void)
 852 {
 853         struct create_durable *buf;
 854
 855         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 856         if (!buf)
 857                 return NULL;
 858
 859         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 860                                         (struct create_durable, Reserved));
 861         buf->ccontext.DataLength = cpu_to_le32(16);
 862         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 863                                 (struct create_durable, Name));
 864         buf->ccontext.NameLength = cpu_to_le16(4);
 865         buf->Name[0] = 'D';
 866         buf->Name[1] = 'H';
 867         buf->Name[2] = 'n';
 868         buf->Name[3] = 'Q';
 869         return buf;
 870 }
 871
 872 static __u8
 873 parse_lease_state(struct smb2_create_rsp *rsp)
 874 {
 875         char *data_offset;
 876         struct create_lease *lc;
 877         bool found = false;
 878         unsigned int next = 0;
 879         char *name;
 880
 881         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
 882         lc = (struct create_lease *)data_offset;
 883         do {
 884                 lc = (struct create_lease *)((char *)lc + next);
 885                 name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 886                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 887                     strncmp(name, "RqLs", 4)) {
 888                         next = le32_to_cpu(lc->ccontext.Next);
 889                         continue;
 890                 }
 891                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 892                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 893                 found = true;
 894                 break;
 895         } while (next != 0);
 896
 897         if (!found)
 898                 return 0;
 899
 900         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
 901 }
 902
 903 static int
 904 add_lease_context(struct kvec *iov, unsigned int *num_iovec, __u8 *oplock)
 905 {
 906         struct smb2_create_req *req = iov[0].iov_base;
 907         unsigned int num = *num_iovec;
 908
 909         iov[num].iov_base = create_lease_buf(oplock+1, *oplock);
 910         if (iov[num].iov_base == NULL)
 911                 return -ENOMEM;
 912         iov[num].iov_len = sizeof(struct create_lease);
 913         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
 914         if (!req->CreateContextsOffset)
 915                 req->CreateContextsOffset = cpu_to_le32(
 916                                 sizeof(struct smb2_create_req) - 4 +
 917                                 iov[num - 1].iov_len);
 918         req->CreateContextsLength = cpu_to_le32(
 919                                 le32_to_cpu(req->CreateContextsLength) +
 920                                 sizeof(struct create_lease));
 921         inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
 922         *num_iovec = num + 1;
 923         return 0;
 924 }
 925
 926 static int
 927 add_durable_context(struct kvec *iov, unsigned int *num_iovec)
 928 {
 929         struct smb2_create_req *req = iov[0].iov_base;
 930         unsigned int num = *num_iovec;
 931
 932         iov[num].iov_base = create_durable_buf();
 933         if (iov[num].iov_base == NULL)
 934                 return -ENOMEM;
 935         iov[num].iov_len = sizeof(struct create_durable);
 936         if (!req->CreateContextsOffset)
 937                 req->CreateContextsOffset =
 938                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
 939                                                                 iov[1].iov_len);
 940         req->CreateContextsLength =
 941                         cpu_to_le32(le32_to_cpu(req->CreateContextsLength) +
 942                                                 sizeof(struct create_durable));
 943         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
 944         *num_iovec = num + 1;
 945         return 0;
 946 }
 947
 948 int
 949 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 950           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 951           __u32 create_disposition, __u32 create_options, __u8 *oplock,
 952           struct smb2_file_all_info *buf)
 953 {
 954         struct smb2_create_req *req;
 955         struct smb2_create_rsp *rsp;
 956         struct TCP_Server_Info *server;
 957         struct cifs_ses *ses = tcon->ses;
 958         struct kvec iov[4];
 959         int resp_buftype;
 960         int uni_path_len;
 961         __le16 *copy_path = NULL;
 962         int copy_size;
 963         int rc = 0;
 964         unsigned int num_iovecs = 2;
 965         __u32 file_attributes = 0;
 966
 967         cifs_dbg(FYI, "create/open\n");
 968
 969         if (ses && (ses->server))
 970                 server = ses->server;
 971         else
 972                 return -EIO;
 973
 974         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 975         if (rc)
 976                 return rc;
 977
 978         if (create_options & CREATE_OPTION_READONLY)
 979                 file_attributes |= ATTR_READONLY;
 980
 981         req->ImpersonationLevel = IL_IMPERSONATION;
 982         req->DesiredAccess = cpu_to_le32(desired_access);
 983         /* File attributes ignored on open (used in create though) */
 984         req->FileAttributes = cpu_to_le32(file_attributes);
 985         req->ShareAccess = FILE_SHARE_ALL_LE;
 986         req->CreateDisposition = cpu_to_le32(create_disposition);
 987         req->CreateOptions = cpu_to_le32(create_options & CREATE_OPTIONS_MASK);
 988         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 989         /* do not count rfc1001 len field */
 990         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
 991
 992         iov[0].iov_base = (char *)req;
 993         /* 4 for rfc1002 length field */
 994         iov[0].iov_len = get_rfc1002_length(req) + 4;
 995
 996         /* MUST set path len (NameLength) to 0 opening root of share */
 997         req->NameLength = cpu_to_le16(uni_path_len - 2);
 998         /* -1 since last byte is buf[0] which is sent below (path) */
 999         iov[0].iov_len--;
1000         if (uni_path_len % 8 != 0) {
1001                 copy_size = uni_path_len / 8 * 8;
1002                 if (copy_size < uni_path_len)
1003                         copy_size += 8;
1004
1005                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1006                 if (!copy_path)
1007                         return -ENOMEM;
1008                 memcpy((char *)copy_path, (const char *)path,
1009                         uni_path_len);
1010                 uni_path_len = copy_size;
1011                 path = copy_path;
1012         }
1013
1014         iov[1].iov_len = uni_path_len;
1015         iov[1].iov_base = path;
1016         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1017         inc_rfc1001_len(req, uni_path_len - 1);
1018
1019         if (!server->oplocks)
1020                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1021
1022         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1023             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1024                 req->RequestedOplockLevel = *oplock;
1025         else {
1026                 rc = add_lease_context(iov, &num_iovecs, oplock);
1027                 if (rc) {
1028                         cifs_small_buf_release(req);
1029                         kfree(copy_path);
1030                         return rc;
1031                 }
1032         }
1033
1034         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1035                 /* need to set Next field of lease context if we request it */
1036                 if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1037                         struct create_context *ccontext =
1038                             (struct create_context *)iov[num_iovecs-1].iov_base;
1039                         ccontext->Next = sizeof(struct create_lease);
1040                 }
1041                 rc = add_durable_context(iov, &num_iovecs);
1042                 if (rc) {
1043                         cifs_small_buf_release(req);
1044                         kfree(copy_path);
1045                         kfree(iov[num_iovecs-1].iov_base);
1046                         return rc;
1047                 }
1048         }
1049
1050         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1051         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1052
1053         if (rc != 0) {
1054                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1055                 goto creat_exit;
1056         }
1057
1058         *persistent_fid = rsp->PersistentFileId;
1059         *volatile_fid = rsp->VolatileFileId;
1060
1061         if (buf) {
1062                 memcpy(buf, &rsp->CreationTime, 32);
1063                 buf->AllocationSize = rsp->AllocationSize;
1064                 buf->EndOfFile = rsp->EndofFile;
1065                 buf->Attributes = rsp->FileAttributes;
1066                 buf->NumberOfLinks = cpu_to_le32(1);
1067                 buf->DeletePending = 0;
1068         }
1069
1070         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1071                 *oplock = parse_lease_state(rsp);
1072         else
1073                 *oplock = rsp->OplockLevel;
1074 creat_exit:
1075         kfree(copy_path);
1076         free_rsp_buf(resp_buftype, rsp);
1077         return rc;
1078 }
1079
1080 /*
1081  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1082  */
1083 int
1084 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1085            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1086            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1087 {
1088         struct smb2_ioctl_req *req;
1089         struct smb2_ioctl_rsp *rsp;
1090         struct TCP_Server_Info *server;
1091         struct cifs_ses *ses = tcon->ses;
1092         struct kvec iov[2];
1093         int resp_buftype;
1094         int num_iovecs;
1095         int rc = 0;
1096
1097         cifs_dbg(FYI, "SMB2 IOCTL\n");
1098
1099         /* zero out returned data len, in case of error */
1100         if (plen)
1101                 *plen = 0;
1102
1103         if (ses && (ses->server))
1104                 server = ses->server;
1105         else
1106                 return -EIO;
1107
1108         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1109         if (rc)
1110                 return rc;
1111
1112         req->CtlCode = cpu_to_le32(opcode);
1113         req->PersistentFileId = persistent_fid;
1114         req->VolatileFileId = volatile_fid;
1115
1116         if (indatalen) {
1117                 req->InputCount = cpu_to_le32(indatalen);
1118                 /* do not set InputOffset if no input data */
1119                 req->InputOffset =
1120                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1121                 iov[1].iov_base = in_data;
1122                 iov[1].iov_len = indatalen;
1123                 num_iovecs = 2;
1124         } else
1125                 num_iovecs = 1;
1126
1127         req->OutputOffset = 0;
1128         req->OutputCount = 0; /* MBZ */
1129
1130         /*
1131          * Could increase MaxOutputResponse, but that would require more
1132          * than one credit. Windows typically sets this smaller, but for some
1133          * ioctls it may be useful to allow server to send more. No point
1134          * limiting what the server can send as long as fits in one credit
1135          */
1136         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1137
1138         if (is_fsctl)
1139                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1140         else
1141                 req->Flags = 0;
1142
1143         iov[0].iov_base = (char *)req;
1144         /* 4 for rfc1002 length field */
1145         iov[0].iov_len = get_rfc1002_length(req) + 4;
1146
1147         if (indatalen)
1148                 inc_rfc1001_len(req, indatalen);
1149
1150         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1151         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1152
1153         if (rc != 0) {
1154                 if (tcon)
1155                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1156                 goto ioctl_exit;
1157         }
1158
1159         /* check if caller wants to look at return data or just return rc */
1160         if ((plen == NULL) || (out_data == NULL))
1161                 goto ioctl_exit;
1162
1163         *plen = le32_to_cpu(rsp->OutputCount);
1164
1165         /* We check for obvious errors in the output buffer length and offset */
1166         if (*plen == 0)
1167                 goto ioctl_exit; /* server returned no data */
1168         else if (*plen > 0xFF00) {
1169                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1170                 *plen = 0;
1171                 rc = -EIO;
1172                 goto ioctl_exit;
1173         }
1174
1175         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1176                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1177                         le32_to_cpu(rsp->OutputOffset));
1178                 *plen = 0;
1179                 rc = -EIO;
1180                 goto ioctl_exit;
1181         }
1182
1183         *out_data = kmalloc(*plen, GFP_KERNEL);
1184         if (*out_data == NULL) {
1185                 rc = -ENOMEM;
1186                 goto ioctl_exit;
1187         }
1188
1189         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1190                *plen);
1191 ioctl_exit:
1192         free_rsp_buf(resp_buftype, rsp);
1193         return rc;
1194 }
1195
1196 int
1197 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1198            u64 persistent_fid, u64 volatile_fid)
1199 {
1200         struct smb2_close_req *req;
1201         struct smb2_close_rsp *rsp;
1202         struct TCP_Server_Info *server;
1203         struct cifs_ses *ses = tcon->ses;
1204         struct kvec iov[1];
1205         int resp_buftype;
1206         int rc = 0;
1207
1208         cifs_dbg(FYI, "Close\n");
1209
1210         if (ses && (ses->server))
1211                 server = ses->server;
1212         else
1213                 return -EIO;
1214
1215         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1216         if (rc)
1217                 return rc;
1218
1219         req->PersistentFileId = persistent_fid;
1220         req->VolatileFileId = volatile_fid;
1221
1222         iov[0].iov_base = (char *)req;
1223         /* 4 for rfc1002 length field */
1224         iov[0].iov_len = get_rfc1002_length(req) + 4;
1225
1226         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1227         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1228
1229         if (rc != 0) {
1230                 if (tcon)
1231                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1232                 goto close_exit;
1233         }
1234
1235         /* BB FIXME - decode close response, update inode for caching */
1236
1237 close_exit:
1238         free_rsp_buf(resp_buftype, rsp);
1239         return rc;
1240 }
1241
1242 static int
1243 validate_buf(unsigned int offset, unsigned int buffer_length,
1244              struct smb2_hdr *hdr, unsigned int min_buf_size)
1245
1246 {
1247         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1248         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1249         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1250         char *end_of_buf = begin_of_buf + buffer_length;
1251
1252
1253         if (buffer_length < min_buf_size) {
1254                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1255                          buffer_length, min_buf_size);
1256                 return -EINVAL;
1257         }
1258
1259         /* check if beyond RFC1001 maximum length */
1260         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1261                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1262                          buffer_length, smb_len);
1263                 return -EINVAL;
1264         }
1265
1266         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1267                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1268                 return -EINVAL;
1269         }
1270
1271         return 0;
1272 }
1273
1274 /*
1275  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1276  * Caller must free buffer.
1277  */
1278 static int
1279 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1280                       struct smb2_hdr *hdr, unsigned int minbufsize,
1281                       char *data)
1282
1283 {
1284         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1285         int rc;
1286
1287         if (!data)
1288                 return -EINVAL;
1289
1290         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1291         if (rc)
1292                 return rc;
1293
1294         memcpy(data, begin_of_buf, buffer_length);
1295
1296         return 0;
1297 }
1298
1299 static int
1300 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1301            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1302            size_t output_len, size_t min_len, void *data)
1303 {
1304         struct smb2_query_info_req *req;
1305         struct smb2_query_info_rsp *rsp = NULL;
1306         struct kvec iov[2];
1307         int rc = 0;
1308         int resp_buftype;
1309         struct TCP_Server_Info *server;
1310         struct cifs_ses *ses = tcon->ses;
1311
1312         cifs_dbg(FYI, "Query Info\n");
1313
1314         if (ses && (ses->server))
1315                 server = ses->server;
1316         else
1317                 return -EIO;
1318
1319         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1320         if (rc)
1321                 return rc;
1322
1323         req->InfoType = SMB2_O_INFO_FILE;
1324         req->FileInfoClass = info_class;
1325         req->PersistentFileId = persistent_fid;
1326         req->VolatileFileId = volatile_fid;
1327         /* 4 for rfc1002 length field and 1 for Buffer */
1328         req->InputBufferOffset =
1329                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1330         req->OutputBufferLength = cpu_to_le32(output_len);
1331
1332         iov[0].iov_base = (char *)req;
1333         /* 4 for rfc1002 length field */
1334         iov[0].iov_len = get_rfc1002_length(req) + 4;
1335
1336         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1337         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1338
1339         if (rc) {
1340                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1341                 goto qinf_exit;
1342         }
1343
1344         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1345                                    le32_to_cpu(rsp->OutputBufferLength),
1346                                    &rsp->hdr, min_len, data);
1347
1348 qinf_exit:
1349         free_rsp_buf(resp_buftype, rsp);
1350         return rc;
1351 }
1352
1353 int
1354 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1355                 u64 persistent_fid, u64 volatile_fid,
1356                 struct smb2_file_all_info *data)
1357 {
1358         return query_info(xid, tcon, persistent_fid, volatile_fid,
1359                           FILE_ALL_INFORMATION,
1360                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1361                           sizeof(struct smb2_file_all_info), data);
1362 }
1363
1364 int
1365 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1366                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1367 {
1368         return query_info(xid, tcon, persistent_fid, volatile_fid,
1369                           FILE_INTERNAL_INFORMATION,
1370                           sizeof(struct smb2_file_internal_info),
1371                           sizeof(struct smb2_file_internal_info), uniqueid);
1372 }
1373
1374 /*
1375  * This is a no-op for now. We're not really interested in the reply, but
1376  * rather in the fact that the server sent one and that server->lstrp
1377  * gets updated.
1378  *
1379  * FIXME: maybe we should consider checking that the reply matches request?
1380  */
1381 static void
1382 smb2_echo_callback(struct mid_q_entry *mid)
1383 {
1384         struct TCP_Server_Info *server = mid->callback_data;
1385         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1386         unsigned int credits_received = 1;
1387
1388         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1389                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1390
1391         DeleteMidQEntry(mid);
1392         add_credits(server, credits_received, CIFS_ECHO_OP);
1393 }
1394
1395 int
1396 SMB2_echo(struct TCP_Server_Info *server)
1397 {
1398         struct smb2_echo_req *req;
1399         int rc = 0;
1400         struct kvec iov;
1401         struct smb_rqst rqst = { .rq_iov = &iov,
1402                                  .rq_nvec = 1 };
1403
1404         cifs_dbg(FYI, "In echo request\n");
1405
1406         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1407         if (rc)
1408                 return rc;
1409
1410         req->hdr.CreditRequest = cpu_to_le16(1);
1411
1412         iov.iov_base = (char *)req;
1413         /* 4 for rfc1002 length field */
1414         iov.iov_len = get_rfc1002_length(req) + 4;
1415
1416         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1417                              CIFS_ECHO_OP);
1418         if (rc)
1419                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1420
1421         cifs_small_buf_release(req);
1422         return rc;
1423 }
1424
1425 int
1426 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1427            u64 volatile_fid)
1428 {
1429         struct smb2_flush_req *req;
1430         struct TCP_Server_Info *server;
1431         struct cifs_ses *ses = tcon->ses;
1432         struct kvec iov[1];
1433         int resp_buftype;
1434         int rc = 0;
1435
1436         cifs_dbg(FYI, "Flush\n");
1437
1438         if (ses && (ses->server))
1439                 server = ses->server;
1440         else
1441                 return -EIO;
1442
1443         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1444         if (rc)
1445                 return rc;
1446
1447         req->PersistentFileId = persistent_fid;
1448         req->VolatileFileId = volatile_fid;
1449
1450         iov[0].iov_base = (char *)req;
1451         /* 4 for rfc1002 length field */
1452         iov[0].iov_len = get_rfc1002_length(req) + 4;
1453
1454         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1455
1456         if ((rc != 0) && tcon)
1457                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1458
1459         free_rsp_buf(resp_buftype, iov[0].iov_base);
1460         return rc;
1461 }
1462
1463 /*
1464  * To form a chain of read requests, any read requests after the first should
1465  * have the end_of_chain boolean set to true.
1466  */
1467 static int
1468 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1469                   unsigned int remaining_bytes, int request_type)
1470 {
1471         int rc = -EACCES;
1472         struct smb2_read_req *req = NULL;
1473
1474         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1475         if (rc)
1476                 return rc;
1477         if (io_parms->tcon->ses->server == NULL)
1478                 return -ECONNABORTED;
1479
1480         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1481
1482         req->PersistentFileId = io_parms->persistent_fid;
1483         req->VolatileFileId = io_parms->volatile_fid;
1484         req->ReadChannelInfoOffset = 0; /* reserved */
1485         req->ReadChannelInfoLength = 0; /* reserved */
1486         req->Channel = 0; /* reserved */
1487         req->MinimumCount = 0;
1488         req->Length = cpu_to_le32(io_parms->length);
1489         req->Offset = cpu_to_le64(io_parms->offset);
1490
1491         if (request_type & CHAINED_REQUEST) {
1492                 if (!(request_type & END_OF_CHAIN)) {
1493                         /* 4 for rfc1002 length field */
1494                         req->hdr.NextCommand =
1495                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1496                 } else /* END_OF_CHAIN */
1497                         req->hdr.NextCommand = 0;
1498                 if (request_type & RELATED_REQUEST) {
1499                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1500                         /*
1501                          * Related requests use info from previous read request
1502                          * in chain.
1503                          */
1504                         req->hdr.SessionId = 0xFFFFFFFF;
1505                         req->hdr.TreeId = 0xFFFFFFFF;
1506                         req->PersistentFileId = 0xFFFFFFFF;
1507                         req->VolatileFileId = 0xFFFFFFFF;
1508                 }
1509         }
1510         if (remaining_bytes > io_parms->length)
1511                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1512         else
1513                 req->RemainingBytes = 0;
1514
1515         iov[0].iov_base = (char *)req;
1516         /* 4 for rfc1002 length field */
1517         iov[0].iov_len = get_rfc1002_length(req) + 4;
1518         return rc;
1519 }
1520
1521 static void
1522 smb2_readv_callback(struct mid_q_entry *mid)
1523 {
1524         struct cifs_readdata *rdata = mid->callback_data;
1525         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1526         struct TCP_Server_Info *server = tcon->ses->server;
1527         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1528         unsigned int credits_received = 1;
1529         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1530                                  .rq_nvec = 1,
1531                                  .rq_pages = rdata->pages,
1532                                  .rq_npages = rdata->nr_pages,
1533                                  .rq_pagesz = rdata->pagesz,
1534                                  .rq_tailsz = rdata->tailsz };
1535
1536         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1537                  __func__, mid->mid, mid->mid_state, rdata->result,
1538                  rdata->bytes);
1539
1540         switch (mid->mid_state) {
1541         case MID_RESPONSE_RECEIVED:
1542                 credits_received = le16_to_cpu(buf->CreditRequest);
1543                 /* result already set, check signature */
1544                 if (server->sign) {
1545                         int rc;
1546
1547                         rc = smb2_verify_signature(&rqst, server);
1548                         if (rc)
1549                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1550                                          rc);
1551                 }
1552                 /* FIXME: should this be counted toward the initiating task? */
1553                 task_io_account_read(rdata->bytes);
1554                 cifs_stats_bytes_read(tcon, rdata->bytes);
1555                 break;
1556         case MID_REQUEST_SUBMITTED:
1557         case MID_RETRY_NEEDED:
1558                 rdata->result = -EAGAIN;
1559                 break;
1560         default:
1561                 if (rdata->result != -ENODATA)
1562                         rdata->result = -EIO;
1563         }
1564
1565         if (rdata->result)
1566                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1567
1568         queue_work(cifsiod_wq, &rdata->work);
1569         DeleteMidQEntry(mid);
1570         add_credits(server, credits_received, 0);
1571 }
1572
1573 /* smb2_async_readv - send an async write, and set up mid to handle result */
1574 int
1575 smb2_async_readv(struct cifs_readdata *rdata)
1576 {
1577         int rc;
1578         struct smb2_hdr *buf;
1579         struct cifs_io_parms io_parms;
1580         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1581                                  .rq_nvec = 1 };
1582
1583         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1584                  __func__, rdata->offset, rdata->bytes);
1585
1586         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1587         io_parms.offset = rdata->offset;
1588         io_parms.length = rdata->bytes;
1589         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1590         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1591         io_parms.pid = rdata->pid;
1592         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1593         if (rc)
1594                 return rc;
1595
1596         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1597         /* 4 for rfc1002 length field */
1598         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1599
1600         kref_get(&rdata->refcount);
1601         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1602                              cifs_readv_receive, smb2_readv_callback,
1603                              rdata, 0);
1604         if (rc) {
1605                 kref_put(&rdata->refcount, cifs_readdata_release);
1606                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1607         }
1608
1609         cifs_small_buf_release(buf);
1610         return rc;
1611 }
1612
1613 int
1614 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1615           unsigned int *nbytes, char **buf, int *buf_type)
1616 {
1617         int resp_buftype, rc = -EACCES;
1618         struct smb2_read_rsp *rsp = NULL;
1619         struct kvec iov[1];
1620
1621         *nbytes = 0;
1622         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1623         if (rc)
1624                 return rc;
1625
1626         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1627                           &resp_buftype, CIFS_LOG_ERROR);
1628
1629         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1630
1631         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1632                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1633                 return 0;
1634         }
1635
1636         if (rc) {
1637                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1638                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1639         } else {
1640                 *nbytes = le32_to_cpu(rsp->DataLength);
1641                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1642                     (*nbytes > io_parms->length)) {
1643                         cifs_dbg(FYI, "bad length %d for count %d\n",
1644                                  *nbytes, io_parms->length);
1645                         rc = -EIO;
1646                         *nbytes = 0;
1647                 }
1648         }
1649
1650         if (*buf) {
1651                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1652                        *nbytes);
1653                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1654         } else if (resp_buftype != CIFS_NO_BUFFER) {
1655                 *buf = iov[0].iov_base;
1656                 if (resp_buftype == CIFS_SMALL_BUFFER)
1657                         *buf_type = CIFS_SMALL_BUFFER;
1658                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1659                         *buf_type = CIFS_LARGE_BUFFER;
1660         }
1661         return rc;
1662 }
1663
1664 /*
1665  * Check the mid_state and signature on received buffer (if any), and queue the
1666  * workqueue completion task.
1667  */
1668 static void
1669 smb2_writev_callback(struct mid_q_entry *mid)
1670 {
1671         struct cifs_writedata *wdata = mid->callback_data;
1672         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1673         unsigned int written;
1674         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1675         unsigned int credits_received = 1;
1676
1677         switch (mid->mid_state) {
1678         case MID_RESPONSE_RECEIVED:
1679                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1680                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1681                 if (wdata->result != 0)
1682                         break;
1683
1684                 written = le32_to_cpu(rsp->DataLength);
1685                 /*
1686                  * Mask off high 16 bits when bytes written as returned
1687                  * by the server is greater than bytes requested by the
1688                  * client. OS/2 servers are known to set incorrect
1689                  * CountHigh values.
1690                  */
1691                 if (written > wdata->bytes)
1692                         written &= 0xFFFF;
1693
1694                 if (written < wdata->bytes)
1695                         wdata->result = -ENOSPC;
1696                 else
1697                         wdata->bytes = written;
1698                 break;
1699         case MID_REQUEST_SUBMITTED:
1700         case MID_RETRY_NEEDED:
1701                 wdata->result = -EAGAIN;
1702                 break;
1703         default:
1704                 wdata->result = -EIO;
1705                 break;
1706         }
1707
1708         if (wdata->result)
1709                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1710
1711         queue_work(cifsiod_wq, &wdata->work);
1712         DeleteMidQEntry(mid);
1713         add_credits(tcon->ses->server, credits_received, 0);
1714 }
1715
1716 /* smb2_async_writev - send an async write, and set up mid to handle result */
1717 int
1718 smb2_async_writev(struct cifs_writedata *wdata)
1719 {
1720         int rc = -EACCES;
1721         struct smb2_write_req *req = NULL;
1722         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1723         struct kvec iov;
1724         struct smb_rqst rqst;
1725
1726         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1727         if (rc)
1728                 goto async_writev_out;
1729
1730         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1731
1732         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1733         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1734         req->WriteChannelInfoOffset = 0;
1735         req->WriteChannelInfoLength = 0;
1736         req->Channel = 0;
1737         req->Offset = cpu_to_le64(wdata->offset);
1738         /* 4 for rfc1002 length field */
1739         req->DataOffset = cpu_to_le16(
1740                                 offsetof(struct smb2_write_req, Buffer) - 4);
1741         req->RemainingBytes = 0;
1742
1743         /* 4 for rfc1002 length field and 1 for Buffer */
1744         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1745         iov.iov_base = req;
1746
1747         rqst.rq_iov = &iov;
1748         rqst.rq_nvec = 1;
1749         rqst.rq_pages = wdata->pages;
1750         rqst.rq_npages = wdata->nr_pages;
1751         rqst.rq_pagesz = wdata->pagesz;
1752         rqst.rq_tailsz = wdata->tailsz;
1753
1754         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1755                  wdata->offset, wdata->bytes);
1756
1757         req->Length = cpu_to_le32(wdata->bytes);
1758
1759         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1760
1761         kref_get(&wdata->refcount);
1762         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1763                                 smb2_writev_callback, wdata, 0);
1764
1765         if (rc) {
1766                 kref_put(&wdata->refcount, cifs_writedata_release);
1767                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1768         }
1769
1770 async_writev_out:
1771         cifs_small_buf_release(req);
1772         return rc;
1773 }
1774
1775 /*
1776  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1777  * The length field from io_parms must be at least 1 and indicates a number of
1778  * elements with data to write that begins with position 1 in iov array. All
1779  * data length is specified by count.
1780  */
1781 int
1782 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1783            unsigned int *nbytes, struct kvec *iov, int n_vec)
1784 {
1785         int rc = 0;
1786         struct smb2_write_req *req = NULL;
1787         struct smb2_write_rsp *rsp = NULL;
1788         int resp_buftype;
1789         *nbytes = 0;
1790
1791         if (n_vec < 1)
1792                 return rc;
1793
1794         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1795         if (rc)
1796                 return rc;
1797
1798         if (io_parms->tcon->ses->server == NULL)
1799                 return -ECONNABORTED;
1800
1801         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1802
1803         req->PersistentFileId = io_parms->persistent_fid;
1804         req->VolatileFileId = io_parms->volatile_fid;
1805         req->WriteChannelInfoOffset = 0;
1806         req->WriteChannelInfoLength = 0;
1807         req->Channel = 0;
1808         req->Length = cpu_to_le32(io_parms->length);
1809         req->Offset = cpu_to_le64(io_parms->offset);
1810         /* 4 for rfc1002 length field */
1811         req->DataOffset = cpu_to_le16(
1812                                 offsetof(struct smb2_write_req, Buffer) - 4);
1813         req->RemainingBytes = 0;
1814
1815         iov[0].iov_base = (char *)req;
1816         /* 4 for rfc1002 length field and 1 for Buffer */
1817         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1818
1819         /* length of entire message including data to be written */
1820         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1821
1822         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1823                           &resp_buftype, 0);
1824         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1825
1826         if (rc) {
1827                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1828                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1829         } else
1830                 *nbytes = le32_to_cpu(rsp->DataLength);
1831
1832         free_rsp_buf(resp_buftype, rsp);
1833         return rc;
1834 }
1835
1836 static unsigned int
1837 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1838 {
1839         int len;
1840         unsigned int entrycount = 0;
1841         unsigned int next_offset = 0;
1842         FILE_DIRECTORY_INFO *entryptr;
1843
1844         if (bufstart == NULL)
1845                 return 0;
1846
1847         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1848
1849         while (1) {
1850                 entryptr = (FILE_DIRECTORY_INFO *)
1851                                         ((char *)entryptr + next_offset);
1852
1853                 if ((char *)entryptr + size > end_of_buf) {
1854                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1855                         break;
1856                 }
1857
1858                 len = le32_to_cpu(entryptr->FileNameLength);
1859                 if ((char *)entryptr + len + size > end_of_buf) {
1860                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1861                                  end_of_buf);
1862                         break;
1863                 }
1864
1865                 *lastentry = (char *)entryptr;
1866                 entrycount++;
1867
1868                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1869                 if (!next_offset)
1870                         break;
1871         }
1872
1873         return entrycount;
1874 }
1875
1876 /*
1877  * Readdir/FindFirst
1878  */
1879 int
1880 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1881                      u64 persistent_fid, u64 volatile_fid, int index,
1882                      struct cifs_search_info *srch_inf)
1883 {
1884         struct smb2_query_directory_req *req;
1885         struct smb2_query_directory_rsp *rsp = NULL;
1886         struct kvec iov[2];
1887         int rc = 0;
1888         int len;
1889         int resp_buftype;
1890         unsigned char *bufptr;
1891         struct TCP_Server_Info *server;
1892         struct cifs_ses *ses = tcon->ses;
1893         __le16 asteriks = cpu_to_le16('*');
1894         char *end_of_smb;
1895         unsigned int output_size = CIFSMaxBufSize;
1896         size_t info_buf_size;
1897
1898         if (ses && (ses->server))
1899                 server = ses->server;
1900         else
1901                 return -EIO;
1902
1903         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1904         if (rc)
1905                 return rc;
1906
1907         switch (srch_inf->info_level) {
1908         case SMB_FIND_FILE_DIRECTORY_INFO:
1909                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1910                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1911                 break;
1912         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1913                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1914                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1915                 break;
1916         default:
1917                 cifs_dbg(VFS, "info level %u isn't supported\n",
1918                          srch_inf->info_level);
1919                 rc = -EINVAL;
1920                 goto qdir_exit;
1921         }
1922
1923         req->FileIndex = cpu_to_le32(index);
1924         req->PersistentFileId = persistent_fid;
1925         req->VolatileFileId = volatile_fid;
1926
1927         len = 0x2;
1928         bufptr = req->Buffer;
1929         memcpy(bufptr, &asteriks, len);
1930
1931         req->FileNameOffset =
1932                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1933         req->FileNameLength = cpu_to_le16(len);
1934         /*
1935          * BB could be 30 bytes or so longer if we used SMB2 specific
1936          * buffer lengths, but this is safe and close enough.
1937          */
1938         output_size = min_t(unsigned int, output_size, server->maxBuf);
1939         output_size = min_t(unsigned int, output_size, 2 << 15);
1940         req->OutputBufferLength = cpu_to_le32(output_size);
1941
1942         iov[0].iov_base = (char *)req;
1943         /* 4 for RFC1001 length and 1 for Buffer */
1944         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1945
1946         iov[1].iov_base = (char *)(req->Buffer);
1947         iov[1].iov_len = len;
1948
1949         inc_rfc1001_len(req, len - 1 /* Buffer */);
1950
1951         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1952         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1953
1954         if (rc) {
1955                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1956                 goto qdir_exit;
1957         }
1958
1959         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1960                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1961                           info_buf_size);
1962         if (rc)
1963                 goto qdir_exit;
1964
1965         srch_inf->unicode = true;
1966
1967         if (srch_inf->ntwrk_buf_start) {
1968                 if (srch_inf->smallBuf)
1969                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1970                 else
1971                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1972         }
1973         srch_inf->ntwrk_buf_start = (char *)rsp;
1974         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1975                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1976         /* 4 for rfc1002 length field */
1977         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1978         srch_inf->entries_in_buffer =
1979                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1980                                     &srch_inf->last_entry, info_buf_size);
1981         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1982         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
1983                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1984                  srch_inf->srch_entries_start, srch_inf->last_entry);
1985         if (resp_buftype == CIFS_LARGE_BUFFER)
1986                 srch_inf->smallBuf = false;
1987         else if (resp_buftype == CIFS_SMALL_BUFFER)
1988                 srch_inf->smallBuf = true;
1989         else
1990                 cifs_dbg(VFS, "illegal search buffer type\n");
1991
1992         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1993                 srch_inf->endOfSearch = 1;
1994         else
1995                 srch_inf->endOfSearch = 0;
1996
1997         return rc;
1998
1999 qdir_exit:
2000         free_rsp_buf(resp_buftype, rsp);
2001         return rc;
2002 }
2003
2004 static int
2005 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2006                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2007                unsigned int num, void **data, unsigned int *size)
2008 {
2009         struct smb2_set_info_req *req;
2010         struct smb2_set_info_rsp *rsp = NULL;
2011         struct kvec *iov;
2012         int rc = 0;
2013         int resp_buftype;
2014         unsigned int i;
2015         struct TCP_Server_Info *server;
2016         struct cifs_ses *ses = tcon->ses;
2017
2018         if (ses && (ses->server))
2019                 server = ses->server;
2020         else
2021                 return -EIO;
2022
2023         if (!num)
2024                 return -EINVAL;
2025
2026         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2027         if (!iov)
2028                 return -ENOMEM;
2029
2030         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2031         if (rc) {
2032                 kfree(iov);
2033                 return rc;
2034         }
2035
2036         req->hdr.ProcessId = cpu_to_le32(pid);
2037
2038         req->InfoType = SMB2_O_INFO_FILE;
2039         req->FileInfoClass = info_class;
2040         req->PersistentFileId = persistent_fid;
2041         req->VolatileFileId = volatile_fid;
2042
2043         /* 4 for RFC1001 length and 1 for Buffer */
2044         req->BufferOffset =
2045                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2046         req->BufferLength = cpu_to_le32(*size);
2047
2048         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2049
2050         memcpy(req->Buffer, *data, *size);
2051
2052         iov[0].iov_base = (char *)req;
2053         /* 4 for RFC1001 length */
2054         iov[0].iov_len = get_rfc1002_length(req) + 4;
2055
2056         for (i = 1; i < num; i++) {
2057                 inc_rfc1001_len(req, size[i]);
2058                 le32_add_cpu(&req->BufferLength, size[i]);
2059                 iov[i].iov_base = (char *)data[i];
2060                 iov[i].iov_len = size[i];
2061         }
2062
2063         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2064         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2065
2066         if (rc != 0) {
2067                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2068                 goto out;
2069         }
2070 out:
2071         free_rsp_buf(resp_buftype, rsp);
2072         kfree(iov);
2073         return rc;
2074 }
2075
2076 int
2077 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2078             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2079 {
2080         struct smb2_file_rename_info info;
2081         void **data;
2082         unsigned int size[2];
2083         int rc;
2084         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2085
2086         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2087         if (!data)
2088                 return -ENOMEM;
2089
2090         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2091                               /* 0 = fail if target already exists */
2092         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2093         info.FileNameLength = cpu_to_le32(len);
2094
2095         data[0] = &info;
2096         size[0] = sizeof(struct smb2_file_rename_info);
2097
2098         data[1] = target_file;
2099         size[1] = len + 2 /* null */;
2100
2101         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2102                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2103                            size);
2104         kfree(data);
2105         return rc;
2106 }
2107
2108 int
2109 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2110                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2111 {
2112         struct smb2_file_link_info info;
2113         void **data;
2114         unsigned int size[2];
2115         int rc;
2116         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2117
2118         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2119         if (!data)
2120                 return -ENOMEM;
2121
2122         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2123                               /* 0 = fail if link already exists */
2124         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2125         info.FileNameLength = cpu_to_le32(len);
2126
2127         data[0] = &info;
2128         size[0] = sizeof(struct smb2_file_link_info);
2129
2130         data[1] = target_file;
2131         size[1] = len + 2 /* null */;
2132
2133         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2134                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2135         kfree(data);
2136         return rc;
2137 }
2138
2139 int
2140 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2141              u64 volatile_fid, u32 pid, __le64 *eof)
2142 {
2143         struct smb2_file_eof_info info;
2144         void *data;
2145         unsigned int size;
2146
2147         info.EndOfFile = *eof;
2148
2149         data = &info;
2150         size = sizeof(struct smb2_file_eof_info);
2151
2152         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2153                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2154 }
2155
2156 int
2157 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2158               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2159 {
2160         unsigned int size;
2161         size = sizeof(FILE_BASIC_INFO);
2162         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2163                              current->tgid, FILE_BASIC_INFORMATION, 1,
2164                              (void **)&buf, &size);
2165 }
2166
2167 int
2168 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2169                   const u64 persistent_fid, const u64 volatile_fid,
2170                   __u8 oplock_level)
2171 {
2172         int rc;
2173         struct smb2_oplock_break *req = NULL;
2174
2175         cifs_dbg(FYI, "SMB2_oplock_break\n");
2176         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2177
2178         if (rc)
2179                 return rc;
2180
2181         req->VolatileFid = volatile_fid;
2182         req->PersistentFid = persistent_fid;
2183         req->OplockLevel = oplock_level;
2184         req->hdr.CreditRequest = cpu_to_le16(1);
2185
2186         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2187         /* SMB2 buffer freed by function above */
2188
2189         if (rc) {
2190                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2191                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2192         }
2193
2194         return rc;
2195 }
2196
2197 static void
2198 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2199                         struct kstatfs *kst)
2200 {
2201         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2202                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2203         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2204         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2205         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2206         return;
2207 }
2208
2209 static int
2210 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2211                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2212 {
2213         int rc;
2214         struct smb2_query_info_req *req;
2215
2216         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2217
2218         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2219                 return -EIO;
2220
2221         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2222         if (rc)
2223                 return rc;
2224
2225         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2226         req->FileInfoClass = level;
2227         req->PersistentFileId = persistent_fid;
2228         req->VolatileFileId = volatile_fid;
2229         /* 4 for rfc1002 length field and 1 for pad */
2230         req->InputBufferOffset =
2231                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2232         req->OutputBufferLength = cpu_to_le32(
2233                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2234
2235         iov->iov_base = (char *)req;
2236         /* 4 for rfc1002 length field */
2237         iov->iov_len = get_rfc1002_length(req) + 4;
2238         return 0;
2239 }
2240
2241 int
2242 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2243               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2244 {
2245         struct smb2_query_info_rsp *rsp = NULL;
2246         struct kvec iov;
2247         int rc = 0;
2248         int resp_buftype;
2249         struct cifs_ses *ses = tcon->ses;
2250         struct smb2_fs_full_size_info *info = NULL;
2251
2252         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2253                                 sizeof(struct smb2_fs_full_size_info),
2254                                 persistent_fid, volatile_fid);
2255         if (rc)
2256                 return rc;
2257
2258         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2259         if (rc) {
2260                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2261                 goto qinf_exit;
2262         }
2263         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2264
2265         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2266                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2267         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2268                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2269                           sizeof(struct smb2_fs_full_size_info));
2270         if (!rc)
2271                 copy_fs_info_to_kstatfs(info, fsdata);
2272
2273 qinf_exit:
2274         free_rsp_buf(resp_buftype, iov.iov_base);
2275         return rc;
2276 }
2277
2278 int
2279 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2280            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2281            const __u32 num_lock, struct smb2_lock_element *buf)
2282 {
2283         int rc = 0;
2284         struct smb2_lock_req *req = NULL;
2285         struct kvec iov[2];
2286         int resp_buf_type;
2287         unsigned int count;
2288
2289         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2290
2291         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2292         if (rc)
2293                 return rc;
2294
2295         req->hdr.ProcessId = cpu_to_le32(pid);
2296         req->LockCount = cpu_to_le16(num_lock);
2297
2298         req->PersistentFileId = persist_fid;
2299         req->VolatileFileId = volatile_fid;
2300
2301         count = num_lock * sizeof(struct smb2_lock_element);
2302         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2303
2304         iov[0].iov_base = (char *)req;
2305         /* 4 for rfc1002 length field and count for all locks */
2306         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2307         iov[1].iov_base = (char *)buf;
2308         iov[1].iov_len = count;
2309
2310         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2311         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2312         if (rc) {
2313                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2314                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2315         }
2316
2317         return rc;
2318 }
2319
2320 int
2321 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2322           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2323           const __u64 length, const __u64 offset, const __u32 lock_flags,
2324           const bool wait)
2325 {
2326         struct smb2_lock_element lock;
2327
2328         lock.Offset = cpu_to_le64(offset);
2329         lock.Length = cpu_to_le64(length);
2330         lock.Flags = cpu_to_le32(lock_flags);
2331         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2332                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2333
2334         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2335 }
2336
2337 int
2338 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2339                  __u8 *lease_key, const __le32 lease_state)
2340 {
2341         int rc;
2342         struct smb2_lease_ack *req = NULL;
2343
2344         cifs_dbg(FYI, "SMB2_lease_break\n");
2345         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2346
2347         if (rc)
2348                 return rc;
2349
2350         req->hdr.CreditRequest = cpu_to_le16(1);
2351         req->StructureSize = cpu_to_le16(36);
2352         inc_rfc1001_len(req, 12);
2353
2354         memcpy(req->LeaseKey, lease_key, 16);
2355         req->LeaseState = lease_state;
2356
2357         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2358         /* SMB2 buffer freed by function above */
2359
2360         if (rc) {
2361                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2362                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2363         }
2364
2365         return rc;
2366 }